• 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:
    SUMMARY OF THE INVENTION The invention relates to a method for emptying an oven floor in a recovery boiler when the near-recovery boiler is shut down. Emptying can begin at the same time as melting still flowing more melt gutters. The floor is emptied by sucking melt from the oven with a single melt ejector. The invention also relates to a device for removing melt and washing water from an oven belonging to a recovery boiler by means of suction. Negative pressure is generated in the device by passing pressurized gas into a suction pipe belonging to the ejector so that the pressurized gas is released in the discharge direction for melting and washing water.
    公开号:SE534070C2
    申请号:SE0950334
    申请日:2007-10-05
    公开日:2011-04-19
    发明作者:Timo Karjunen
    申请人:Boildec Oy；
    IPC主号:
    专利说明:

    534 070 2 the closing of the boiler. Another problem associated with the use of spiral pumps is that their installation requires a rather long working period in the immediate vicinity of the gutters.
    SUMMARY In accordance with a first aspect of the invention, there is provided a method of emptying the floor of a recovery boiler when the boiler is shut down, the method comprising: generating, in a melting ejector, of negative pressure used for ejection, and sucking melt from the recovery boiler with melting ejector based on vacuum suction through an opening arranged in a boiler wall.
    The melting ejector used in accordance with an embodiment of the invention is, as such, a non-mechanical device. The suction is generated, for example, by means of gas which is emitted at high speed. In one embodiment, gas is led into the suction device and is further caused to move in the suction device in the discharge direction of the suction device. In one embodiment, the gas first tends to entrain ambient gas due to friction and soon afterwards (when the melting ejector begins to operate in the true sense of the word) melts from the recovery boiler.
    In an embodiment of the invention, said opening is a melting gutter opening or another opening arranged for the purpose of emptying. In one embodiment of the invention, melt is sucked with a melt ejector whose suction pipe is consistently substantially hollow and free of obstructions. In one embodiment of the invention, melt is sucked with a melt ejector from a furnace belonging to a recovery boiler into a melting chute, either directly or through the melting chute into a melting tank or a dissolution tank, or into another collection system. Said melt to be sucked may be, for example, saline melt or washing water.
    In one embodiment of the invention, the beginning of the emptying is brought forward so that the emptying of the floor begins while melting still flows in the melting gutters. If at this time there is still undigested salt on the floor in, for example, the corners of the oven, the melting of the salt can be continued simultaneously by spraying black liquor into the oven and adjusting the spraying of the black liquor so that the black liquor jets are distributed evenly over the entire oven floor. In one embodiment of the invention, the ejection of the melt continues until the furnace floor has been thoroughly emptied of saline melt. In one embodiment of the heating, if the black liquor tank becomes empty before the accumulation of melt on the furnace floor is gone, heating of the floor continues with only oil or gas burners. The beginning of the ejection can be scheduled to start so early that the period during which the heating of the salt on the floor only depends on gas or oil burners remains so short that the saline melt does not have time to solidify before the floor has been emptied. In one embodiment of the invention, the closing of the boiler is accelerated by placing and designing the ejectors so that melt is sucked from the deepest part of the accumulation of melt. whereby the floor can be emptied more completely. Due to this, the boiler cools down more quickly after emptying the floor, whereby the start of water washing of the oven and superheaters placed in the upper part of the oven can be brought forward.
    According to another aspect of the invention, there is provided a melting ejector for emptying a floor in a recovery boiler when the boiler is shut down, which melting ejector is adapted to be installed in an opening provided in a recovery boiler wall, and that the melting ejector comprises: a mechanism for generating vacuum suction with which melt is sucked from the recovery boiler. In one embodiment of the invention, a melting ejector is used, comprising a suction pipe having a suction end and a discharge end, which suction pipe is arranged to suck melt through the suction end of a furnace belonging to a recovery boiler, and the discharge end is arranged to discharge melt from the ejector. In one embodiment of the invention, the melt ejector is designed in such a way that, when installed in place in the opening in the boiler, it will be positioned so that the suction end of the suction pipe is located in a deep part of an accumulation of melt near the floor and the discharge end. releases melt into a gutter or directly into a dissolution tank. In one embodiment of the invention, the melting ejector is shaped so as to conform to the melting chute of the recovery boiler. In an embodiment of the invention, at least one bend is arranged in the suction pipe of the melting ejector, the angle of which determines the positions of the suction end and the discharge end.
    The part of the suction pipe between the suction end and the bend forms a comb-like part with which melt can be sucked from the desired part on the oven floor. When the ejector is installed in the opening in the recovery boiler wall, the cam-like part is adapted to limit the movement of the ejector in the longitudinal direction of the ejector. In one embodiment of the invention, the melting ejector is constructed to generate vacuum suction in a manner in which pressurized gas is led into the ejector from a pressurized gas connection included by the ejector so that the gas is discharged in the ejector discharge direction.
    The ejector may comprise a tube for pressurized gas attached to the suction tube by, for example, welding, which tube for pressurized gas can be used as an installation arm, holding device which the ejector can be pushed into place in the opening in the boiler wall. In one embodiment of the invention, the pressurized gas pipe is smaller in diameter than the suction pipe and welded to the suction pipe so that it extends into the suction pipe and points towards the discharge end.
    In one embodiment of the invention, a melting ejector based on vacuum suction is used which can be safely installed on site even while melting flows in the melting gutters and which is not sensitive to mechanical defects because there are no external parts in the suction pipe of the device.
    Various embodiments of the invention will or have been described only in connection with one or more of the aspects of the invention. However, the embodiments may also be applicable to other aspects of the invention, and vice versa.
    BRIEF DESCRIPTION OF THE DRAWINGS In the following, the invention will be described by way of example with reference to the accompanying drawings, in which: Figure 1 shows a cross section of a recovery boiler; Figure 2 shows a melt ejector in accordance with an embodiment of the invention; and Figure 3 shows the melting ejector in accordance with an embodiment of the invention installed on site. DETAILED DESCRIPTION It should be noted that the visade gures shown are not entirely to scale, and function primarily to illustrate embodiments of the invention.
    Figure 1 shows a cross section of a recovery boiler 10 in the area of an oven belonging to the recovery boiler. There is a partially molten saline accumulation 11 and molten deposits 12 on the floor of the boiler. Black liquor is injected into the boiler with black liquor spray nozzles 13, typically from openings in all four walls so that, when the boiler is fully loaded, typically 6 to 10 spray nozzles are in use, depending on the size of the boiler.
    The black liquor spray openings are typically at a height of 6 to 7 meters above the floor.
    The combustion of the black liquor in the furnace belonging to the boiler is controlled by passing air into the boiler from primary air vents 16, secondary air vents 17 and tertiary air vents (not shown). The saline melt formed on the floor flows from the saline accumulation 11 through melt gutters 15 to a dissolution tank 19. In a method according to an embodiment of the invention it is an object to first melt the melt on the furnace floor in its entirety when the recovery boiler is shut down by simultaneous combustion. of black liquor and auxiliary fuel, the auxiliary fuel usually being oil or gas.
    The auxiliary fuel is combusted with starter burner 18 installed on the walls belonging to the boiler (figure 1).
    The spraying of the black liquor is adjusted so that the black liquor jets are distributed evenly over the oven floor, whereby melt deposits on the edges of the furnace can also be melted. The adjustment can be implemented, for example, by always using spray nozzles located at opposite sides of the boiler when the boiler is closed down to achieve symmetrical melting. An example case involves the use of two black liquor spray nozzles, keeping the valves of the black liquor line open for black liquor spray nozzles on two opposite walls. Alternatively or in addition, the direction and pressure of the black liquor nozzles can be adjusted so that the black liquor is distributed over the entire floor and the black liquor effectively forms droplets. The selection and control mechanism for the black liquor spray nozzles to be used is, as such, known to those skilled in the art. In one embodiment of the invention, the combustion of the black liquor is adjusted while the boiler is shut down by controlling the amount and distribution of combustion air so that a sufficient amount of primary air is led into the furnace compared to the flows of secondary and tertiary air. as well as black liquor and auxiliary fuel so that the black liquor is mainly burned in the lower part of the furnace. The combustion of the black liquor thus heats the salt on the floor more efficiently than, for example, gas flames, from which heat is conducted less to the floor. The control mechanism for the amount and distribution of combustion air is, as such, known to those skilled in the art.
    When the melt on the floor is completely or partially melted and a suitable amount of black liquor remains in the black liquor tank (not shown), the emptying of the floor is started by installing a melt ejector in the boiler walls and opening valves for pressurized gas lines leading to the ejectors. The flow of the black liquor is adjusted so that the melt ejectors remove a larger amount of melt from the furnace floor than the amount of salt carried to the furnace with the black liquor, whereby the accumulation of melt on the furnace floor begins to be emptied. This may continue until the black liquor tank is empty. After this, the heating of the floor continues with only the oil or gas burners 18 (figure 1).
    The injection of the melt is allowed to continue until the floor is emptied of salt so that the orifices on the suction ends of the ejectors are partially revealed, at which point the suction is no longer sufficient to remove the melt. After this, the melt ejectors can be removed for maintenance.
    Figure 2 shows an example of a melt ejector suitable for melt injection. Negative pressure is generated in the ejector 20 by passing pressurized gas into the ejector through a smaller pipeline 22. The pressurized gas line 22 is fitted to the ejector 20 so that the pressurized gas is discharged to the discharge side of the ejector.
    As shown in Figure 2, the ejector 20 includes a suction pipe 21 and a pressurized gas pipe 22. which are made of, for example, acid-resistant steel. In an example case, the outer diameter of the suction pipe 21 is 76 mm and the thickness of the pipe wall is 3 mm. The outer diameter of the pressurized gas pipe 22 is 15 mm and the thickness of the pipe wall is 1 mm. In one example case, the suction tube 21 is welded by three rectilinear parts and two bends so that the lengths of the rectilinear parts are 300 mm, 750 mm and 250 mm, respectively, and the parts are joined by bends of 100 ”and 112 °, respectively. The discharge end of the ejector consists of a rectilinear tube 250 mm in length with a bore drilled in the preceding 112 ° bend, in which bore the pressurized gas tube 22 is fitted by welding so that the pressurized gas tube 22 is in the suction tube 21 in the direction of the center line of the rectilinear pipe forming the discharge end of the suction pipe 21 and the discharge end of the pressurized gas pipe 22 is at the level of the discharge side of the bend. The pressurized gas is thus discharged in the discharge direction of the ejector 20, whereby suction is generated which removes the melt or water from the furnace. At the same time, the pressurized gas breaks down the molten gas into droplets so that no separate decomposition with steam jets is necessarily needed.
    The pressurized gas pipe (or a pressurized air connection) can be designed and supported so that it simultaneously functions as an installation arm for the ejector, holding device which the ejector can be pushed into place. Alternatively, a special installation arm (not shown) can be fitted to the ejector (by, for example, welding), holding device which the ejector 20 can be installed in the melt gutter opening or any other installation opening in the black liquor boiler wall.
    The pressurized gas required for the ejector 20 can be taken from a low pressure steam line or a pressurized air system (not shown) used in the mill. The pressurized gas pipe 22 is connected to the mill's steam network or pressurized gas network with a pressurized hose provided with suitable accessories.
    Figure 3 shows the melting ejector 20 shown in Figure 2 installed on site. In the exemplary case, the suction pipe 21 of the ejector is installed in the melting trough 15, the suction end of the ejector being pushed from the melting gutter opening into the accumulation 11 of melt on the floor of the furnace 30, below the surface of the accumulation and near the floor. In one embodiment of the invention, the melt ejector is designed to conform to the post-melting rune 15. In one embodiment of the invention, the suction end inlet 32 is configured to be in a substantially horizontal plane in its operating position to improve suction. The part of the suction pipe 21 between the bend 33 and the inlet 32 of the suction end is designed so that it reaches the desired part on the oven floor. In one embodiment of the invention, this curved portion functions to prevent lateral displacement of the ejector and tilt of the ejector to one side because the tip of the curved portion tends to fall downward. The pressurized gas connection entering the ejector can also work to prevent lateral displacement. If there is a cover with a pivotable housing 35 over the melting chute 15, it can function to prevent lateral movement of the melting ejector. Typically, the housing 35 has the same width as the molten chute 15. The edges of the housing 35 limit the clearance for lateral movement of the pressurized gas connection. 2D 25 30 35 534 070 8 In an embodiment of the invention, the melting gutter 15 comprises a part which forms a collar 34 in the gutter opening in the wall 30 of the furnace 30. In the example case illustrated in Figure 3, the bent portion rests between the bend and the suction end (or bend 33) on the edge of the melting trough collar 34 when the melting ejector is installed in the opening. The part of the suction pipe 21 extending from this point towards the discharge end rests on the remaining part of the gutter 15.
    In other words, the melting gutter 15 forms a support surface on which the melting ejector rests and which keeps the melting ejector in place.
    In the embodiment shown in Figure 3, the melt from the opening at the discharge end 36 of the ejector falls directly into the dissolution tank 19. Alternatively, the ejector may be shorter and / or the bend on the side of the discharge end may be excluded. In this case, for example, the melt can be discharged from the ejector first into the gutter 15 and through the gutter into the dissolution tank 19.
    Once the melting ejector has been installed in place, it is put into service by connecting the pressurized gas pipe 22 with suitable accessories 37 to a pressurized gas line 38 and opening a valve 39 in the pressurized gas line so that the gas discharged into the ejector generates the negative pressure used for ejection. The valve 39 for the pressurized gas line may be located far away from the ejector, the use of the ejector not requiring work in its immediate vicinity. In alternative embodiments of the invention, the emptying of the floor in the recovery boiler is implemented in a manner that deviates from the above. Instead of the melt gutters, for example, the ejector can be installed in openings provided in the furnace walls, especially for the purpose of emptying the floor, placed over the surface of the accumulation of melt near the part where the accumulation of melt on the floor is deepest. Thus, the ejector will more easily reach the deepest part of the accumulation of melt and the floor can be emptied of salt practically completely.
    In addition to removing saline melt, the melt ejector described above is also suitable for removing wash water accumulated on the oven floor when the boiler is washed with water. When removing washing water, the ejector is installed in principle in the same way as when removing melt. Instead of the accumulation of melt, the suction end is pushed into an accumulation of water formed in the boiler. 10 15 20 25 534 070 9 The shape and size of the suction tube and the pressurized gas tube of the ejector can be changed to adapt the effect of the ejector to each particular need and existing structures.
    Instead of connecting the ejector directly to the melting channel or the dissolution tank, depending on the purpose of use, the ejector can also be connected to a pipe extension, through which the melt fl destroys the dissolution tank or other collection system.
    Alternative materials for the ejector can include, among other materials, different types of steel that can withstand high temperatures as well as erosion and corrosion caused by the melt better than acid-resistant steel.
    The above description provides non-limiting examples of some embodiments of the invention. However, it will be apparent to one skilled in the art that the invention is not limited to the details presented; rather, the invention can also be implemented in other equivalent ways. The described methods and the described melting ejector can also be used to suck saline melt in other possible industrial processes where saline melt is generated. For the purposes of this document, the terms "includes" and "includes" are open and are not intended to be limiting.
    Certain features of the disclosed embodiments may be utilized without the use of other features. The above description, as such, is to be construed as a descriptive presentation of the principles of the invention and not as limiting the invention. Accordingly, the scope of the invention is limited only by the appended claims.
    权利要求:
    Claims (2)
    [1] 1. A method and device for removal of sodalye from a soda recovery' boiler, c h a r a c t e r -i s e d in that the soda lye of the boiler is removedfrom the boiler in conjunction with a shutdown of thesoda recovery boiler by heating the boiler using a gas or oil flame in such a manner that the soda lye re-mains in the molten state and its temperature is 800-900'C, and that the amount of the combustion air ofthe boiler is adjusted to achieve a suitable tempera-ture, whereby the soda lye is removed from the bottomof the boiler by pumping it by means of a pump (1)into a soda melt channel, and the flowing lye is bro-ken into droplets by means of steam prior to introduc-ing it into a solution tank.
    [2] 2. The method for removal of molten lye asdefined. in. clainl 1, c h a r a c t e r i s e d ill thatthe pumping is performed using a spiral pump (1) pro-vided with a suction pipe (4) and an outlet curve (6)attached to it, and a spiral (9) disposed within the the spiral being mounted with an ax-ial and radial hearing (10)(6), and that the pump includes a body pipevided with a drive (14), and that the body pipe is at-tached to the curve (6) whereby the suction pipe (4) and suction pipe (4),disposed within the curve(13) pro- by means of an openable con- necting element (15),the curve (6) and the spiral 9 can be changed.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI20065668A|FI120549B|2006-10-18|2006-10-18|Method and apparatus for emptying the bottom of a recovery boiler|
    PCT/FI2007/050543|WO2008046959A1|2006-10-18|2007-10-05|A method and device for emptying the floor of a soda recovery boiler|
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