• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for emptying the bottom of the fireplace of a recovery boiler on salt when the boiler is run down. 5 The emptying can be started when the salt-melted ice gutters are still flowing. The bottom is emptied by sucking out melt from the fireplace with a melt suction. The invention also relates to a device for removing melt and washing water from the fireplace of a recovery boiler by suction. In the device, a negative pressure is generated by directing pressurized gas into a suction pipe in the suction so that the preheated pressurized gas flows out in the outlet direction of the melt and the water. Fig. 3
    公开号:SE1150489A1
    申请号:SE1150489
    申请日:2009-10-19
    公开日:2011-08-22
    发明作者:Timo Karjunen
    申请人:Boildec Oy；
    IPC主号:
    专利说明:

    even has a drive device for the pump. Approximately in the middle of the pipe there is a curved portion which forms an outlet pipe through which the salt melt is removed from the pipe. In recovery boilers whose bottom has such a profile that the melting basin is as deep as possible near the melting gutters, melt can not necessarily be pumped away at the deepest point in the basin with a spiral pump, but in many cases a large amount of salt can still remain on the fireplace bottom after pumping.
    This prolongs the water washing time and makes the descent slower thereby.
    A second problem with the spiral pumps is that their assembly requires relatively long-term work in the immediate vicinity of the gutters.
    Finnish patent application No. 20065668 describes a method and a device for emptying the bottom of the fireplace in a recovery boiler on melting when the recovery boiler is run down. The bottom is emptied by sucking out melt from the fireplace with a melt suction. In the device, a negative pressure is generated by directing pressurized gas to a suction pipe in the suction so that the pressurized gas flows out in the direction where the melt is removed.
    SUMMARY An object of the invention is to provide a method and a device with which melt can be sucked out of a recovery boiler even more efficiently.
    According to a first aspect of the invention, there is provided a method of emptying the bottom of a recovery boiler when lowering the boiler, in which method vacuum suction is provided with a suction device by arranging discharge of pressure medium from a pressure medium discharge point in the outlet direction of the suction device, and suction melts from the recovery boiler with the suction device based on vacuum suction through a hole in the wall of the recovery boiler, and during the process the pressure medium is preheated before it is discharged from the discharge point.
    In one embodiment of the invention, melt is sucked out of the recovery boiler through a hole in the wall of the recovery boiler based on negative pressure suction generated by means of pressure medium supplied with a pressure medium pipe, and the pressure medium is preheated before being discharged from the outlet end of the pressure medium pipe .
    In certain embodiments of the invention, the negative pressure required by the suction device is generated by directing pressure medium, such as pressure gas or pressure steam, into the suction device so that the gas flows out in the discharge direction of the suction device.
    In certain embodiments of the invention, the pressure medium is heated by means of the hot melt. In certain embodiments of the invention, the pressure medium is heated by means of the hot melt and / or a separate, heat-independent heat source before it is led into the suction pipe. Thus, in certain embodiments of the invention, the pressure medium is heated by means of the hot melt and / or a separate heat source independent of the melt while the pressure medium flows in a pressure medium tube or a pressure medium channel outside the suction pipe of the suction device. In certain embodiments of the invention, the pressure medium is heated by means of the hot melt while the pressure medium flows in a pressure medium tube within the suction tube of the suction device.
    In certain embodiments of the invention, the pressure medium is heated by means of a separate, heat-independent heat source, such as with an electrical resistor.
    According to a second aspect of the invention, there is provided a suction device for emptying the bottom of a recovery boiler, which suction device comprises an arrangement for providing negative pressure suction by means of pressure medium, through which negative pressure suction sucks melt out of the recovery boiler, and the suction device further comprises a preheating arrangement for heating the printing medium.
    In certain embodiments of the invention, the suction device comprises a pressure medium pipe. The preheating arrangement comprises preheating the pressure medium before its outlet end within a suction pipe in the suction device, and which outlet end. In certain embodiments of the invention, the suction device comprises a pressure medium tube which follows the shape of a suction tube in the suction device.
    In certain embodiments of the invention, the suction device comprises a pressure medium tube which is arranged to extend within a suction tube in the suction device.
    In certain embodiments of the invention, the suction device comprises a pressure medium tube which is arranged to extend along the outer surface of a suction tube in the suction device.
    In certain embodiments of the invention, the suction device comprises a separate heating device, such as a heating resistor, for the pressure medium.
    In certain embodiments of the invention, the heating resistor is arranged to heat the pressure medium tube. Preferably, the heating resistor is arranged around the pressure medium tube.
    In certain embodiments of the invention, the preheating arrangement comprises a pressure medium tube which is so placed in a melting suction that during use of the melting suction it is under the heating action of the hot melt.
    In certain embodiments of the invention, a vacuum is generated for suction in the suction device and suction is melted by vacuum suction.
    In certain embodiments of the invention, the melting suction used is a per se device without machine power. The suction is achieved, for example, with the help of gas or steam that flows out at a high speed. In some embodiments, the gas or steam to the suction device is controlled and further controlled in the suction device so that they flow in the direction of the discharge direction of the suction device. In one embodiment, the gas tends to initially carry the gas around with it by the action of friction and to soon thereafter (when the melt suction begins to function in the true sense of the word) draw melt out of the recovery boiler. In certain embodiments of the invention, the melt is sucked out through a hole in the wall of the recovery boiler. In certain embodiments of the invention, said hole is a melting hole or other hole intended for pre-empting.
    In certain embodiments of the invention, the melt is sucked out of the fireplace of the recovery boiler to a melting chute, to a melting or solvent pool directly or via the melting chute or to another collecting arrangement. Said melt which is sucked out is preferably salt melt. In some embodiments, the melt may alternatively be wash water.
    In certain embodiments of the invention, the beginning of the emptying of the bottom is brought forward so that the emptying of the bottom is started already when melt is still flowing in the melting gutters. If there is still undigested salt, for example in the corner of the fireplace, the melting of the salt can be continued at the same time by spraying black liquor into the fireplace and by adjusting the spraying of the black liquor so that the black liquor jets are evenly distributed over the entire area of the fireplace.
    In certain embodiments of the invention, the extraction of the melt continues until the bottom of the fireplace has been emptied of the salt melt in its entirety. If the black liquor container becomes empty before the melting basin on the bottom of the fireplace is empty, the heating of the bottom is continued only with oil or gas burners in an embodiment of the invention.
    The extraction can be set to start so early that the period during which the heating of the salt on the bottom is only managed by the gas or oil burners is so short that the salt melt does not have time to solidify until the bottom is empty.
    In certain embodiments of the invention, the lowering of the recovery boiler is accelerated by the suction being placed and designed so that the suction of the melt takes place at the deepest point in the melting basin, whereby the bottom can be emptied more accurately.
    This means that the boiler cools down faster after emptying the bottom, whereby it becomes possible to start washing the fireplace and the superheaters in the upper part of the fireplace earlier.
    In certain embodiments of the invention there is provided a suction device for emptying the bottom of a recovery boiler when the recovery boiler is run down, which suction device is arranged to be placed in a hole in the wall of the boiler and that the suction device comprises a mechanism for producing a suction through which the recovery boiler is emptied of the melt.
    In certain embodiments of the invention, the suction device comprises a melting suction comprising a suction tube with a suction end and a discharge end, which suction pipe is arranged to suck melt out of the fireplace of the recovery boiler with the suction end, and the discharge end is arranged to remove the melt from the suction.
    In some embodiments of the invention, the suction device is designed so that in the mounted position in the hole in the boiler it is positioned so that the suction end of the suction pipe is located at the deepest point in the melting basin, near the bottom, and the discharge end removes melt to a melting trough In some embodiments, the suction device is designed to follow the melting chute of the recovery boiler.
    In certain embodiments of the invention, the suction pipe of the suction device comprises at least one curve whose sharpness determines the position of the suction pipe in the fireplace of the boiler and outside it. Preferably, the portion of the suction pipe from the curve in the direction of the mouth of the suction end of the suction pipe forms a pipe-like part with which it can be sucked out melt from the fireplace at a desired point. Preferably, the pipe-like part is arranged to limit the movement of the sugar in the longitudinal direction of the sugar when the sugar is mounted in the hole in the wall of the recovery boiler.
    In certain embodiments of the invention, the suction device is configured to provide vacuum suction in such a way that to the inside of the suction device pressure medium is led to a pressure medium pipe in the suction device so that the pressure medium in preheated state flows out from the outlet end of the pressure medium pipe.
    In certain embodiments of the invention, the suction device is configured to provide vacuum suction in such a way that preheated pressurized gas is led to the pressure medium pipe and the gas flows out in the discharge direction of the suction device 10.
    In certain embodiments of the invention, the melt suction is configured to effect vacuum suction in this way, to the inside of the suction, pressurized gas is led from a pressurized gas connection and the gas flows out in the discharge direction of the suction.
    The vacuum cleaner can, for example, comprise a compressed gas pipe welded together with the suction pipe, which can be used as a mounting shaft which enables the vacuum cleaner to be pushed into place in the hole in the wall of the boiler manually.
    In certain embodiments of the invention, the pressurized gas tube has a smaller diameter than the suction tube and is welded together with the suction tube so that it extends into the suction tube and is directed towards the outlet end of the suction tube.
    In some embodiments of the invention, a melt suction is used which is based on negative pressure suction and which can be mounted on site safely even when melt flows in the melt gutters and which does not have a great tendency for mechanical faults because there are no moving parts in the device's suction pipe.
    The various embodiments of the present invention are described or have been described only with respect to one or certain aspects of the invention. One skilled in the art will recognize that any embodiment of an aspect of the invention may be applied to the same aspect or other aspects of the invention separately or in combination with other embodiments.
    BRIEF DESCRIPTION OF THE FIGURES The invention is described in the following with reference to the accompanying drawings, in which Figure 1 is a cross section of a recovery boiler; Figure 2 shows a melt suction according to an embodiment of the invention; Figure 3 shows a melt suction according to a second embodiment of the invention; Figure 4 shows a melt suction according to a third embodiment of the invention; Figure 5 shows a melt suction according to a fourth embodiment of the invention; Figure 6 is a cross-section of a melt suction according to an embodiment of the invention; and Figure 7 shows a melt suction according to an embodiment of the invention in mounted position.
    DETAILED DESCRIPTION Note that the figures are not to scale in their entirety and are intended to illustrate embodiments of the invention.
    Figure 1 is a cross section of a recovery boiler 10 in the area around the recovery boiler fireplace. At the bottom of the boiler there is a partially molten salt basin 11 and solid 12. For black liquor sprayers 13, typically from openings in all four of its walls so that in the boiler salt formations, ie. salt lumps the boiler is sprayed black liquor with at full load typically 6 - 10 syringes are used depending on the size of the boiler.
    The black liquor spray openings are typically 6 - 7 meters above the bottom.
    The combustion of the black liquor in the boiler fireplace is controlled by supplying the boiler with air through primary air vents 16, secondary air vents 17 and tertiary air vents (not shown). The salt melt formed on the bottom flows from the salt basin 11 down to a solvent basin 19 along melting gutters 15.
    In a method according to an embodiment of the invention, the aim is to first melt the salt on the bottom of the fireplace in its entirety when the recovery boiler is run down by simultaneously burning black liquor and supporting fuel in the fireplace, which usually consists of oil or gas. The auxiliary fuel is combusted with a starter burner 18 which is mounted in the walls of the boiler (figure 1).
    The spraying of black liquor is controlled so that the black liquor jets are evenly distributed over the entire area of the fireplace bottom, whereby the lumps of salt in the edges of the fireplace also melt. The inspection can be carried out, for example, by always spraying the black liquor on the descending side with sprayers which are placed on opposite sides of the boiler so that the bottom is used to melt two symmetrically. In an example case, the black liquor sprayers, the valves in the black liquor line being kept open for the black liquor sprayers in the two opposite walls of the boiler. Alternatively or in addition, the direction or pressure of the black liquor sprayers can be adjusted so that the black liquor spreads over the entire area of the bottom and that the black liquor forms droplets effectively. The mechanism for selecting and controlling the black liquor sprayers is known per se to a person skilled in the art.
    In an embodiment of the invention, the combustion of the black liquor during the descent of the boiler is controlled by controlling the amount and distribution of the combustion air so that the primary air is controlled with sufficient primary air compared to the secondary air and tertiary air and the black liquor and support fuel flows. . Then the combustion of the black liquor heats the salt on the bottom more efficiently than, for example, gas flames whose heat is transferred to the bottom less efficiently. The mechanism for controlling the amount and distribution of the combustion air is known per se to a person skilled in the art.
    When the bottom has been melted in its entirety or for the most part and in the black liquor container (not shown) there is still a suitable amount of black liquor left, emptying of the bottom is started by mounting the melt suction holes in the walls and by opening the valves for the suction lines leading to the suction lines. The black liquor flow is regulated so that the amount of melt removed by the smelters from the bottom of the fireplace is greater than the amount of salt in the fireplace together with the black liquor, whereby the melting pool at the bottom of the fireplace begins to be emptied. This is continued until the black liquor container is empty. Thereafter, the heating of the bottom is continued only with the oil or gas burners 18 (figure 1).
    The suction of melt continues until the bottom has been emptied of the salt so that the mouths of the suction ends of the sucks are partially visible, whereby the suction is no longer sufficient to move the melt. The melts can then be removed for service. In an embodiment of the invention, melt is sucked with a melt suction device where pressure medium is used which is preheated before the outlet end of the compressed gas pipe. Figures 15 - 5 and 7 show examples of a melting suction suitable for melting suction in a partial cross-sectional drawing. In the sucker 20, a negative pressure is generated by directing pressure medium, such as pressurized gas or steam, to it through a smaller pipeline 22. A pressure medium tube, such as a pressurized gas pipe 22, is connected to the sucker 20, so that the pressurized gas flows out on the suction outlet side, towards the removed the melt. Preferably, the flow pressure gas exits from the outlet end of the pressurized gas pipe 22 parallel to the center line of a suction pipe 21 in the suction. The pressurized gas pipe 22 and the outlet end constituting its outlet point may be located in the middle of the suction pipe or further out on the edge or fixed to the inner surface of the suction pipe.
    As Figure 2 shows, the sucker 20 comprises a suction pipe 21 and a compressed gas pipe 22 which is, for example, made of acid-resistant steel. In the example case, the outer diameter of the suction tube 21 and the thickness of the wall of the tube are 76 mm and 3 mm, respectively. The outer diameter of the compressed gas pipe 22 and the thickness of the pipe wall are 15 mm and 1 mm, respectively. In the exemplary case according to Figure 2, the suction tube 21 consists of three straight parts and two curves which are welded together, the straight parts of the straight parts being 300, 750 and 250 mm and they are connected by curves of 100 ° and 112 °. The compressed gas pipe 22 is led to the inside of the suction pipe 21 through a hole drilled in the wall of the middle straight part where the compressed gas pipe 22 is fixed, for example by welding. The passage of the pressurized gas pipe 22 through the suction pipe 21 is tight in order to generate a suitable negative pressure in the suction pipe 21. especially at the beginning of the suction. The suction end of the suction consists of a 250 mm long straight pipe which is connected to a 750 mm long straight part by a curve of 112 °. The compressed gas pipe 22 is so fixed inside the suction pipe that the compressed gas pipe 22 follows the shape of the suction pipe. Within the suction pipe, the compressed gas pipe 22 is preferably attached to the straight part of the suction pipe 750 mm and the straight pipe which constitutes the discharge end 36 parallel to the center lines of these pipes. The pressurized gas thus flows out in the discharge direction of the suction 20 and creates a suction which moves away melt or water from the fireplace. Since the compressed gas in some embodiments decomposes the melt flow into droplets, separate decomposition with steam jets is not necessarily required.
    In Figure 2, the compressed gas pipe 22 follows the shape of the suction pipe 21 outside the suction pipe before the point where the compressed gas pipe 22 is led to the inside of the suction pipe 21. Inside the suction pipe, the compressed gas pipe 22 follows the shape of the suction pipe. Since the pressurized gas tube 22 in the suction is within the range of the heating action of the hot melt, the pressurized gas is preheated outside and inside the suction tube 21 before the pressurized gas flows into the suction tube 21.
    Preferably, the compressed gas pipe is attached to the outer surface of the middle straight pipe part.
    Alternatively, the compressed gas pipe 22 may not be within the range of the heating action of the hot melt outside the suction pipe 21. In that case, the compressed gas pipe may extend freely before the feed point so that it does not follow the shape of the suction pipe 21. This also applies to the other embodiments.
    Figure 3 shows a second example of a melt suction 20 suitable for melt suction, the description of which is referred to Figure 2 with the difference that the pressurized gas pipe 22 is not placed in the same way and that the pressurized gas is preheated by means of a separate heating device 24. If the pressurized gas pipe 22 is very shortly after the implementation, the preheating takes place in practice only by means of the heating device 24. If the compressed gas pipe 22 is arranged to slide into the suction pipe 21 over a longer distance, the compressed gas pipe follows the shape of the suction pipe 21 and the heating of the compressed gas is made more efficient. The heating device 24 is described in more detail below. The compressed gas pipe 22 is led to the inside of the suction pipe 21 through a hole drilled in the wall of the curve before the discharge end 36 and where the compressed gas pipe 22 is attached, for example, by welding. The passage of the pressurized gas pipe 22 through the suction pipe 21 is tight, for example welded, in order to generate a suitable negative pressure in the suction pipe 21, especially at the beginning of the suction. Within the suction pipe 21, the pressurized gas pipe 22 is preferably attached to the straight pipe constituting the discharge end 36 center line, whereby the pressurized gas flows out in the discharge direction of the suction 20 and creates a suction which moves away melt or water from the fireplace.
    Figure 4 shows a third example of a melt suction 20 suitable for suction for melting, the description of which is referred to Figure 2 with the difference that the compressed gas pipe 22 is not placed in the same way and that the compressed gas in addition to the heating provided by the placement of the compressed gas pipe 22 can also be heated with by means of a separate heating device 24. The pressurized gas tube 22 can be in direct contact with the melt outside the suction tube 21. The pressurized gas tube 22 is led to the inside of the suction tube 21 through a heel drilled in the wall of the straight part forming the suction 20 suction end 32 and where the compressed gas pipe 22 is attached, for example by welding pressure-tight. The discharge end 36 of the suction consists of a straight tube which is connected to the middle straight part of the suction tube by means of a curve.
    The compressed gas pipe 22 is so fixed inside the suction pipe 21 that the compressed gas pipe 22 follows the shape of the suction pipe. within the suction pipe 21, the compressed gas pipe 22 is preferably attached parallel to the center line of the suction pipe over the entire length of the suction pipe. The pressurized gas thus flows out in the discharge direction of the suction 20 and creates a suction which moves away melt or water from the fireplace. In Figure 4, the compressed gas pipe 22 follows the shape of the suction pipe 21 outside the suction pipe 21 before the point where the compressed gas pipe is led to the inside of the suction pipe 21.
    The pressurized gas pipe 22 is preferably attached to the outer surface of the middle straight pipe section and suction end 32 of the suction pipe.
    Figure 5 shows a fourth example of a melt suction suitable for melt suction, a short melt suction which lacks the second curve shown in Figures 2 and 4 at the discharge end 36. For the description of the suction pipe, reference is also made to Figure 2 in applicable parts. In addition to the heating provided by the location of the pressurized gas pipe 22, the pressurized gas can also be heated by means of a separate heating device 24. The pressurized gas pipe 22 is led to the inside of the suction pipe 21 through a hole drilled in the wall of the straight part the compressed gas pipe 22 is attached, for example, by welding.
    The discharge end 36 of the suction consists of a straight pipe which is connected to the suction end 32 by means of a curve. The compressed gas pipe 22 is so fixed inside the suction pipe 21 that the compressed gas pipe 22 follows the shape of the suction pipe. In Figure 5, the pressurized gas tube 22 is preferably attached to the inner surface of the suction tube 21, or near the inner surface, over the length of the straight portion constituting the suction end 32, or of the beginning of the straight portion 36 constituting the discharge end, and the pressurized gas tube 22 is attached along the suction tube 21 center line in the area around the end of the outlet end 36. The compressed gas thus flows out in the discharge direction of the suction 20 and creates a suction which moves away melt or water from the fireplace. In Figure 5, the compressed gas pipe 22 follows the shape of the suction pipe 21 outside the suction pipe 21 before the point where the compressed gas pipe is led to the inside of the suction pipe 21.
    The pressurized gas pipe 22 is preferably attached to the outer surface of the middle straight pipe part of the suction pipe and the suction end 32. For the pressurized gas, preheating can be arranged, for example in the manner shown in Figures 2 - 5 and 7. In some embodiments, the pressurized gas is preheated by a separate heater 24. In some embodiments, the pressurized gas is preheated by arranging the pressurized gas tube 22 to extend along the outer surface of the melting suction 20, the pressurized gas being heated by the melt and the fireplace. In some embodiments, the pressurized gas is preheated by arranging the pressurized gas tube 22 to extend within the suction tube 21, the pressurized gas being heated by the melt during suction. In some embodiments, the arrangement for preheating the pressurized gas comprises locating the pressurized gas tube 22 within the range of the heating action of the hot melt and a separate heating device 24. In some embodiments, the separate heating device 24 is a heating resistor. The heating resistor 24 is preferably arranged to heat the compressed gas by means of the compressed gas pipe 22. In certain embodiments, the heating resistor 24 is arranged around the outer surface of the compressed gas pipe 22. In the heating device, the temperature of the pressurized gas is allowed to rise, for example up to 300 ° C. outside certain embodiments of the suction suction 20, Figure 6 is a cross section of the melt suction 20 at a place where by means of one or more supports 23 a compressed gas pipe 22 is mounted at a desired point in the cross section of the suction pipe 21, on the center line of the suction pipe 21 in Figure 6. , 4 and 5 illustrate how the compressed gas pipe 22 within the suction pipe 21 is fixed parallel to the center line of the suction pipe by means of the support / supports 23. In figure 4 two supports 23 are used: approximately in the middle of the middle straight part of the suction pipe and in the outlet end of the compressed gas pipe 22 In fi gures 3 and 5 a support 23 is used in the outlet end of the compressed gas pipe 22. The support 23 preferably comprises arms which, for example by welding, are fastened between the outer surface of the compressed gas pipe 22 and the inner surface of the suction pipe 21. The number of said arms is preferably three. A support 23 can be a prefabricated component that is fixed in place, for example by welding. The 23 arms of the support are designed to withstand the flow of the melt as little as possible. In some embodiments, at least a portion of the compressed gas pipe 22 is arranged parallel to the center line of the suction pipe 21, preferably on the center line of the suction pipe 21. By arranging the pressure gas pipe 22 to follow the shape of the suction pipe, preheating of pressure medium, such as pressure gas, is effected before the point where the pressure medium flows out from the outlet end of the pressure gas pipe 22. The pressurized gas can typically have a temperature of about 20 ° C before it enters the pressurized gas tube 22 and a temperature that is significantly closer to the temperature of the extracted melt as it flows out from the outlet end. This reduces the occurrence of local significant temperature differences at the discharge end 36 of the sugar 20.
    The compressed gas pipe (or compressed gas duct) can be designed and supported so that it simultaneously functions as a mounting shaft by means of which the suction can be pushed into place manually. Alternatively, a special mounting shaft (not shown) can be connected to the sucker by means of which the sucker 20 can be mounted in a melting trough hole or other mounting hole in the wall of the recovery boiler.
    The compressed gas required by the sucker 20 can, for example, be taken from a low-pressure steam line or a compressed air system (not shown) used in the factories.
    The pressurized gas pipe 22 is connected to the factory's steam or pressurized gas network with a pressurized hose provided with suitable connectors.
    Fig. 7 shows the melting suction 20 in mounted position. Here, the molten vacuum cleaner shown in Figure 4 is used as an example. In Figure 7, the pressurized gas is preheated before the point where the pressurized gas flows out from the outlet end of the pressurized gas tube 22 by placing the pressurized gas tube 22 within the range of the hot melt heating action outside and inside the suction tube 21, and in addition the pressurized gas can be preheated before the point where the pressurized gas flows out from the outlet end of the pressurized gas tube 22.
    In the example case, the suction pipe 21 of the suction is mounted in a melting trough 15, the suction end of the suction projecting below the surface of the melting basin 11 arranged on the bottom of the fireplace 30, to the vicinity of the bottom. In one embodiment of the invention, the melt suction is designed to follow the melt chute 15. In one embodiment of the invention, the mouth 32 of the suction end is designed so that in its position of use it lies substantially horizontally to make the suction more efficient. The portion of the suction tube 21 from the curve 33 towards the mouth 32 of the suction end forms a spout or a spout-like part. In one embodiment of the invention, the spout is helpful in that it acts as a kind of lateral stabilizer which prevents the sucker from leaning to the side because it can also act as a lateral stabilizer to the pressurized gas duct. If above the tip of the spout is prone to bend downwards. the sugar leading melting gutter 15 has a hood 35, i.e. a lid box with hinges, it can act as a limiter of the lateral movement of the vacuum cleaner. The hood 35 is typically as wide as the gutter 15. The edges of the hood 35 limit the range of movement of the pressurized gas duct in the lateral direction.
    In an embodiment of the invention, the gutter 15 comprises a part which forms a kind of collar 34 in the gutter hole in the wall of the fireplace 30. When the melt suction is mounted in the hole, it rests, for example, in Figure 7 on the edge of the collar 34 of the melt gutter at its pipe-like part (or curve 33). The portion of the suction pipe 21 therefrom to the outlet end rests on the rest of the melting gutter 15. The melting gutter 15 thus forms a support surface against which the melting gutter slopes and stays in place.
    In the embodiment shown in Figure 7, the melt from the discharge opening at the discharge end 36 of the sugar falls directly into a solvent basin 19. Alternatively, the sugar may be shorter, and / or the curve at the discharge end may be missing (as in Figure 5). Then the melt can first flow from the sucker up to the gutter 15 and then down to the solvent pool 19 along it.
    When the melting suction is mounted in place, it is put into use by connecting the compressed gas pipe 22 to the compressed gas line 38 with suitable connectors 37 and by opening the valve 39 of the compressed gas line so that the gas entering the suction produces the negative pressure used in the suction. Since the valve 39 of the pressurized gas line can be placed at a long distance from the sucker, the use of the sucker does not require work in the immediate vicinity thereof.
    In an embodiment of the invention, the pressure of the pressure medium in the pressure gas line 39 is approximately 10 bar. 10 15 20 25 30 16 In some cases hot water vapor is readily available in the vicinity of the recovery boiler. In some embodiments of the invention the pressure medium is vapor, in some embodiments the temperature of the vapor is about 200 ° C.
    In certain alternative embodiments of the invention, the emptying of the bottom of the recovery boiler is carried out in a manner which deviates from those stated above. The suction can instead of the melting gutters, for example, be mounted in holes made in the fireplace wall especially for emptying the bottom and which is located above the surface of the melting pool near the point where the melting pool at the bottom is deepest. Then the sugar more easily reaches the deepest point in the melting basin and the bottom can in practice be emptied of the salt in its entirety.
    The melting suction described above is not only suitable for removing salt melt but also washing water collected on the bottom of the fireplace during water washing of the boiler. When removing washing water, mount the sugar instead of the salt melting basin, push the suction end of the sugar into the principle formed in the boiler in the same way as when removing melt. In the water basin.
    The shape and size of the suction pipe and the pressure gas pipe as well as the pressure gas pressure can be varied to make the effect correspond to the need and the existing constructions at each individual occasion. In addition, instead of the straight melting channel or solvent pool, it can, depending on the purpose of use, be connected to a melt flowing down to extension tubes through which the solvent pool or other collection system.
    As the sucker's material, different types of steel can be used, which can withstand high temperatures and erosion and corrosion caused by the melt better than acid-resistant steel.
    In yet another embodiment of the invention, in the sucker, instead of the above-mentioned exemplary pressure medium pipe solutions, a special pressure medium pipe solution can be used for transferring the pressure medium. In some such embodiments there is a second tube, an outer tube, on the above-mentioned suction tube (21), whereby between the outer surface of the suction tube (21) and the inner surface of the outer tube becomes a hollow space, a pressure medium channel.
    The pressure medium channel may be parallel to the longitudinal direction of the suction pipe (21), extending in the space between the outer surface of the suction pipe (21) and the inner surface of the outer pipe in the longitudinal direction of the suction pipe (21) or suction device. Instead of an outer tube, another closed structure can alternatively be used which forms a similar pressure medium channel between the outer surface of the suction tube (21) and the inner surface of the structure.
    The pressure medium can be led to the pressure medium channel closer to the suction end of the suction device and fed into the suction pipe (21) closer to the discharge end of the suction device, from the outlet end of the channel which thereby forms an outlet point for the pressure medium channel in the suction pipe (21). In practice, a bushing can be provided from the pressure medium channel to the inside of the suction pipe (21). In one embodiment, the flow direction of the pressure medium is controlled by means of a short or longer piece of pipe or the like at the bushing so that it corresponds to the discharge direction of the suction pipe (or suction device), the pressure medium being caused to flow into the suction pipe (21) in the suction device discharge direction. The preheating of the pressure medium works in the same way as above, ie. by the action of the hot melt or by means of a separate heating source.
    This description provides non-limiting examples of certain embodiments of the invention. One skilled in the art will recognize that the invention is not limited to the details set forth above but has other equivalent embodiments. The methods described above and the melt suction described above can also be used for sucking the salt melt in other possible industrial processes which produce salt melt. The terms in this document are open terms and are not intended to be limiting.
    Some features of the above embodiments may be utilized without the use of the other features. This description as such is to be considered only as an explanation of the principles of the invention and not as limiting. Thus, the scope of the invention is limited only by the appended claims.
    权利要求:
    Claims (10)
    [1]
    A method of emptying the bottom of a recovery boiler when the boiler is run down, in which method vacuum suction is effected with a suction device (20) by arranging (20) pressure medium discharge point in the outlet direction of the suction device (20), and discharging pressure medium into the suction device from melt out of the recovery boiler (10) with the suction device (20) based on vacuum suction through a hole in the wall of the recovery boiler, characterized in that in the process the pressure medium is preheated before it is discharged from the discharge point.
    [2]
    A method according to claim 1, wherein the pressure medium is heated by means of the hot melt.
    [3]
    A method according to claim 1 or 2, wherein the pressure medium is heated with a heat source (24) which is independent of the melt, such as with an electrical resistor.
    [4]
    A method according to any one of the preceding claims, wherein flowing pressure medium, such as pressure gas or pressure steam, is transported in a pressure medium pipe (22) or a pressure medium channel in the suction device (20) for heating thereof before it is discharged from the discharge point.
    [5]
    A suction device for emptying the bottom of a recovery boiler, which suction device comprises an arrangement for effecting negative pressure suction by means of a pressure medium, through which negative pressure suction is sucked out melt from a recovery boiler, characterized in that the suction device (20) further comprises a preheating arrangement for heating of the print medium.
    [6]
    A suction device according to claim 5, comprising a pressure medium tube (22) or a pressure medium channel whose outlet end lies in a suction pipe (21) in the suction device (20), and which preheating arrangement comprises preheating the pressure medium before the discharge point formed by the outlet end. 10 15 19
    [7]
    A suction device according to claim 5 or 6, comprising a pressure medium tube (22) or a pressure medium channel which follows the shape of a suction tube (21) in the suction device (20).
    [8]
    Suction device according to any one of the preceding claims 5-7, comprising a pressure medium pipe (22) arranged to extend within a suction pipe (21) in the suction device (20).
    [9]
    A suction device according to any one of the preceding claims 5-8, comprising a pressure medium pipe (22) arranged to extend along the outer surface of a suction pipe (21) in the suction device (20).
    [10]
    A suction device according to any one of the preceding claims 5-9, comprising a separate pressure medium heating device (24), such as an electrical resistor.
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    同族专利:
    公开号 | 公开日
    CA2745710A1|2010-06-10|
    WO2010063875A1|2010-06-10|
    FI20086166A0|2008-12-05|
    FI122836B|2012-07-31|
    BRPI0921516B1|2020-03-24|
    FI20086166A|2010-06-06|
    SE535409C2|2012-07-31|
    US8808461B2|2014-08-19|
    CN102239294A|2011-11-09|
    US20110232688A1|2011-09-29|
    RU2011126272A|2013-01-10|
    JP2012511136A|2012-05-17|
    CA2745710C|2017-01-03|
    JP5707331B2|2015-04-30|
    CN102239294B|2014-09-10|
    RU2523972C2|2014-07-27|
    BRPI0921516A2|2018-05-29|
    PT2010063875W|2012-03-29|
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    法律状态:
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    2019-05-28| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    FI20086166A|FI122836B|2008-12-05|2008-12-05|Method and apparatus for emptying the bottom of a soda pan|
    PCT/FI2009/050836|WO2010063875A1|2008-12-05|2009-10-19|A method and device for emptying the floor of a black liquor recovery boiler|
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