瑞典专利SE0950213A1 Method and apparatus for clearing green liquor

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专利摘要:

公开号:SE0950213A1
申请号:SE0950213
申请日:2009-04-02
公开日:2010-10-03
发明作者:Mikael Lindstroem；Christofer Lindgren；Lennart Boerjeson；Lennart Kaellen
申请人:Cleanflow Ab；
IPC主号:

专利说明:

15 20 25 30 35 even more. The filter cake must be removed, which causes production stoppages which in turn leads to lower productivity and higher operating costs.
U.S. Pat. No. 5,361,8443 relates to the clarification of green liquor by means of case filtration.
The filter material is made of a textile cloth. The described device comprises a pressurized vessel in which your filter elements are mounted in a vertical position or substantially vertical position, and the liquid to be filtered flows due to the gravitational force along the filter layers on the outside of the filter elements. Depending on the pressure difference, caused by pressurized gas, between the outer and inner surfaces of the filter elements, the filtrate penetrates the surface of the filter from the outside of the filter surface to its inside and reaches the filtrate channel surrounded by the filtration layers. and a relatively high energy consumption.
To solve the problems associated with green liquor clarification, an filtration technique using a new type of filter has been investigated. The filtration technique, hereinafter referred to as cross-destructive filtration, is described in a degree project at the Royal Institute of Technology, Stockholm, by Fredrik Broström, 2007, TRlTA-CHE report 2007: 66 ISSN 1654-1081.
The transverse filter comprises a long tubular ceramic membrane element perforated with its channels in its longitudinal direction. The green liquor is transported into the channels and as it flows through the channels, the filtrate passes through the membrane channel walls and flows in a radial direction from the inside of the channels to their outside. The pore size of the ceramic membrane used was 45 μm.
However, in the degree project it is described that the fate of green lye oil decreased rapidly. Within a day, fate was one-sixth of the initial fate. According to the author, this can be solved by controlling the inlet fate to the cross-fate filter.
BRIEF DESCRIPTION OF THE INVENTION It is an object of the present invention to overcome the disadvantages and inconveniences of the above-mentioned filtration methods for clarifying green liquor.
It has surprisingly been found that an orlterpore size> 0.1 μm but significantly lower than the 45 μm used in the degree project, preferably an plterpore size of 0.1 - 10 10 15 20 25 30 35 μm, more preferably 0.1 - 5 μm and most preferably 0.2 - 1.0 μm as well as control of the green liquor filtrate ﬂ fate prevents the observed capacity reduction.
In accordance with one aspect of the invention, since the flowing suspension is forced to flow, the ability to place the filter elements in any direction and in any inclination relative to gravity is an important feature of the invention as it is an energy source and not gravity. forces the suspension to flow. If the filtration device is to be mounted in an existing system and the space is limited, the possibility of being able to place the filter elements in any direction / slope is a great advantage. As shown in Fig. 1, the suspension to be filtered is forced to flow upstream towards the direction of gravity.
In accordance with another aspect of the invention, Reynolds' numbers are preferably greater than 10,000 but less than 45,000, more preferably 10,000-25,000 and most preferably 12,000-17,000.
According to a further aspect of the invention, the filtrate content of the green liquor should be less than 50% of the flowing suspension, preferably less than 40% and most preferably less than 30% but not less than 5%.
In accordance with another aspect of the invention, the use of kanlter channels with converging cross-sectional area as an alternative to cylindrical cross-sectional area promotes constant d velocity or constant Reynolds speech through the filter channel.
In accordance with another aspect of the invention, the filtrate flow is controlled by controlling the pressure of the green liquor as the green liquor flows into the filter and Reynolds number is controlled by controlling the fate of the slurry out of the filter.
In accordance with a further aspect of the invention, the cross-flow filter is connected in series with at least one further cross-flow filter in such a way that a portion of the slurry from the first filter unit is led to the inlet of the further filter unit for further filtration.
In accordance with yet another aspect of the invention, the cross-flow filter is coupled in parallel with at least one additional cross-flow filter. In accordance with yet another aspect of the invention, the transverse filter is connected to an existing green liquor treatment plant in order to increase the capacity of the existing treatment plant. The filter unit is arranged as a first filtration step before final purification in the existing treatment plant.
In accordance with a further aspect of the recovery, the filter is connected transversely to an existing green liquor treatment plant in order to increase the degree of purification of the already purified green liquor. The filter unit is arranged to filter already purified green liquor.
In accordance with yet another aspect of the invention, the cross-flow filter is a replacement for an existing green liquor treatment plant.
BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail below with reference to the accompanying drawings, in which: Fig. 1 schematically shows a preferred embodiment of a device for purifying green liquor by transverse filtration for practicing the invention; Fig. 2 shows an alternative device where two transverse filters are connected in series; Fig. 3 shows a device where the transverse filter is used as a capacity booster in a continuous green liquor treatment plant; Fig. 4 shows a device in which an existing purification plant for green liquor is supplemented with a cross-flow filter to increase the degree of purification of the already purified green liquor; Fig. 5 shows a cross-sectional side view of A) an filter body with a cylindrical filter channel and B) a filter body with a converging filter channel; Fig. 6 shows a view from the outside of an filter element with your filter bodies and their filter channels and the end plate; Fig. 7 shows a cross-sectional view of a filter element filled with a supporting structure having your filter channels.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The cross-flow filter consists of a filter unit comprising one or more filter elements. These filter elements are provided with a number of filter bodies, each filter body comprising a filter channel.
The filter body also includes porous filter walls which surround the channels. Each filter body comprises a supporting structure and in connection with the filter walls, which can be integrated therewith. In a preferred embodiment, the filtration layer is applied as a coating to the inside of the supporting structure. In some preferred installations, the coating may have filter pores with a filter pore size of 0.2 to 1.0 micrometers. In other installations, other pore sizes may be more advantageous, but should normally be in the range of 0.1 to 10 micrometers.
The filter walls of this embodiment may be made of a ceramic material. The inner diameter of the filter channels inside the filter elements is 1-10 mm while the length of the filter channels is preferably 0.5 - 3 m, more preferably 0.7 - 2.2 m and most preferably 0.8 - 1.5 m.
The green liquor is forced to flow into the filter ducts of the filter unit. The passage of green liquor through the filter layer - the membrane - is driven by a pressure difference between the inside and outside of the filter walls. The pressure inside the ducts is 0.2-2 bar higher than the pressure outside the välter walls and thereby a proportion of the green liquor is forced to pass through the inside of the duct walls to the outside of the walls in a radial direction and perpendicular to the direction of the ducts.
Since the pore size of the membrane is on a micrometer scale, the passage of sludge through the membrane is prevented and the sludge continues its fate in the remaining suspension through the channels to the end opposite the inlet, leaving the alter body as a slurry.
A typical filter device according to the invention as illustrated in Fig. 1 comprises a filter unit 4 comprising a filter housing 10, in which one or more filter elements 12 are mounted. The filter element 12 comprises longitudinal filter bodies, which are preferably in the form of tubes and have filter channels inside the filter bodies.
The filter channels have a first surface on the inside of the filter walls which surround the filter channels and a second surface on the outside of the filter walls which surround the filter channels.
Chemicals to be recovered from the recovery boiler are led via line 25 into tank 40 and dissolved in weak liquor, whereby green liquor is formed. The green liquor is led via line 26 to a pump 61 and pumped via line 27 into tank 41. The suspension to be filtered is led from tank 41 via line 20 and passes pump 62 and is pumped via line 30 to an inlet 13 and further into the filter channels inside the filter element Part of the suspension is forced to pass the filtration layer from an inside / thirsty / inner surface of the filtration layer to an outer / second / outer surface of the filtration layer and forms an filtrate while the solid remains mainly in the remaining part of the suspension and forms a slurry. The purified filtrate is collected in the filter housing 10 and the filtrate is passed from the filter housing 10 through line 21 to a collection tank 42. The purified filtrate (purified green liquor) is then passed via line 28 to a pump 63 and pumped via line 29 to the white liquor preparation (not shown).
The slurry containing the sludge passes the outlet 14 and a part of the slurry passes the valve 50 and is recycled via line 24 to tank 41 while another part of the slurry passes through valve 51 and is led via line 23 to a slurry 70 for dewatering and then via line 24 to a landfill 80.
Fig. 2 shows an alternative to the device in Figs. 1 and shows two series-connected switching units 4, 4 '. A part of the slurry obtained from the first filter unit 4 passes control valve 51 and is led via line 23 to a tank 43. In the tank 43 the incoming slurry from the first filter stage is collected and mixed with the recycled slurry from the second filter stage. The slurry is then led via line 200 to the pump 620 and pumped via inlet 130 into the second filter 4 'and forced to flow through the filter channels. The filtrate is collected inside the filter housing 100 and led from the filter housing 100 via a line 210 to the collection tank 42. The filtrate is then led via line 28 to a pump 63 and pumped via line 29 to the white liquor preparation (not shown).
The concentrated slurry passes outlet 140 and a portion of the slurry passes through valve 500 and is recirculated via line 240 to tank 43 and combined with the slurry obtained from the first filtration step via line 23.
Another part of the concentrated slurry passes the valve 510 and is led via line 230 to a sludge filter 70 for dewatering and then led via line 24 to landfill 80. In the first filter unit 4 can for example be used under milder conditions, i.e. lower Reynolds number which means less cavitation inside the filter channels, which leads to reduced wear on the filter bodies, in order to extend its service life. Since the slurry concentration is lower, this filter will be less prone to clogging and therefore it may be advantageous to use a filter with a larger pore diameter in this position in some applications. In addition, the need to stop the filtration to clean the filter is reduced, which leads to higher availability and production. The second filter unit 4 'can then be used under more difficult conditions due to the higher concentration of sludge, higher flow rates, smaller pore diameter and more frequent cleaning compared to the first filter unit 4. Alternatively, both filter units can be used under the same conditions.
Another advantage of two filter units connected in series may be for space reasons. It can sometimes be easier to fit two smaller hus lter houses than a large one in an existing chemical recycling plant in the mill. Of course, even more than two filter units can be connected in series to either obtain sufficient capacity or to obtain a sufficient degree of purification or for depletion reasons where one or two larger filter units are replaced by your small filter units, which is easier to fit into the inconvenient chemical recovery unit.
It is of course possible to connect one or more units to the first filter unit in parallel, resulting in a "first set of parallel filter units", and to recycle one part of the sludge containing slurry from this "first set of parallel filter units" while another part of the sludge containing slurry from the “first set of parallel filter units” is led to a filter unit connected in series with the “first set of parallel filter units”. This option is not displayed.
An alternative to using only one alternator for further filtering of the slurry-containing slurry from the “first set of parallel filter units” is to have two or alternate units connected in parallel in a “second set of parallel alternators”. Connecting a “first set of parallel filter units” with a “second set of parallel filter units” results in increased capacity in the clarification process as well as in a very well purified green liquor. It may also be easier to fit your small filters than one or two large filters in an existing chemical recycling facility, as mentioned above. This option is not displayed.
Fig. 3 shows a device for increasing capacity. The filter unit 4 is used as a capacity booster of an existing green liquor treatment plant and the chemicals to be recovered from the recovery boiler are led via line 25 into tank 40 and dissolved in weak liquor, whereby green liquor is formed. A part of the green liquor is led via line 26 to a pump 61 and pumped via line 30 to the inlet 13 of the filter elements 12 in the filter unit 4. The purified filtrate is led via line 21 to the white liquor preparation while the slurry passes the outlet 14 and is led via line 22 to further purification in the green liquor clarifier 90.
An armed part ﬂ of the green liquor is led from the release tank 40 via line 260 to a pump 611 and the green liquor is pumped via line 270 to the green liquor clarifier 90. The clarified green liquor is led away through line 210. The sludge-containing slurry links the green liquor clamp 90 via line 220 .
Fig. 3 schematically shows either a way to reduce the load on the green liquor clarifier by cross-fate filtering a part of the green liquor or a way to increase the capacity of the chemical recovery unit by introducing a cross-fate filtration step which already takes care of a part of the green liquor needed. working at its maximum capacity. The combined flow of green liquor in lines 21 and 220 is led to the white liquor preparation and has a considerably lower content of sludge as the liquid in line 21 is virtually free of sludge while the reduced load on the clarifier 90 will also reduce the content of sludge in line 220. .
Alternatively, all of the green liquor from tank 40 may pass through line 26 to the filter unit 4 to maintain a suitable flow of liquid through the filter channels before the excess liquid is sent to the clarifier 90 through line 22.
Fig. 4 shows a device for final cleaning of clarified green liquor. A significant green liquor treatment plant is supplemented with a filter unit 4 to increase the degree of purification of the already purified green liquor. The clarified green liquor is led from the clamp 90 via line 210 to a collection tank 41 and is forced by pump 62 to flow through line 30 to the inlet of the filter elements 12 in the filter unit 4 and further into the filter channels where the clamped green liquor is filtered for final solids separation. The purified filtrate is passed through line 21 and has a very high degree of purification. The recirculation of the slurry's part ﬂ fate (corresponding to line 24 in Fig. 1, lines 24 and 240 in Fig. 2 and line 22 in Fig. 4) ensures that Reynolds' speech is maintained in the under during the flow along the ﬁ channels. Otherwise, in the absence of recirculation, the velocity of the suspension along the passage through the filter channels will decrease, leading to an filter cake building up on the filtration layers, which in turn lowers the filtration efficiency. The recirculation also ensures that the desired ratio between the inlet fate and the filtrate fate is maintained at the predetermined level.
Fig. 5A shows a cross-sectional view from the side of the filter body 3 in its longitudinal direction.
The filter body 3 has a cylindrical shape and comprises a supporting structure 31 and a filter channel 33. The surface on the inside of the supporting structure 31 has an filtering layer 32 10 covering the entire surface inside the supporting structure 31. The filtering layer 32 has one in the first / inner surface 32A and a second / outer surface 32B and is provided with pores of approximately 0.2 to 1.0 micrometers in size.
Arrow 1 shows the direction of the incoming flowing suspension. Arrow 2 shows the direction of a portion of the flowing suspension of the flowing suspension which first passes through the first / inner surface 32A of the filter layer 32, then through the filter layer 32 and further through the second / outer surface 32B of the filter layer 32 and further through the supporting structure 31. the suspension has now been filtered and thus formed an filtrate consisting of purified green liquor.
Fig. SB shows a cross-sectional side view of an alter body 3 with a converging alter channel 33. An alternative to cylindrical alter channels 33 with a circular cross-sectional area would be to use alter channels 33 with a converging cross-sectional area. Suspensions flowing in filter channels 33 with a converging cross-sectional area will maintain Reynolds' number or velocity velocity during flow along the entire length of the filter channels despite the fact that the volumetric velocity velocity within the channels decreases as a result of penetration of the suspensions through the penetration surfaces.
The suspension will maintain its speed or Reynolds number and no kltercake will build up on the ytlter surface thanks to the maintained speed.
Fig. 6 shows a view from the front of an alter element 12 with your alter bodies 3.
The filter bodies 3 comprise a supporting structure 331 and an filter channel 33. The inside surface of the supporting structure 31 has an filtration layer 32 covering the entire inside of the supporting structure 31. The filtration layer 32 has a first / inner surface 32A and a second / outer surface 32B. Fig. 6 also shows an end plate 34 which covers the entire end surface of the filter element 12 with the exception of the filter channels 33. The end plate 34 is fixed at the ends of the filter bodies 3 and has through holes of the same diameter as the diameter of the filter channels 33. The flowing suspension to be filtered when the end plate 34 passes through the through holes in the end plate 34 and flows into the filter channels 33 where part of the flowing suspension will be filtered while another part of the flowing suspension continues to flow through the filter channel 33. The end plate 34 controls the incoming flowing suspension to the filter channels 33. Another feature of the end plate 34 is that it supports the filter bodies 3 and keeps them axed in their positions. In Fig. 6, the filter bodies 3 are placed so close to each other that each filter body 3 is in contact with the surrounding filter bodies 3. The filter bodies 3 can be placed so close to each other that the wall 31 of an filter channel also forms part of the wall of the surrounding filter bodies.
The filter bodies shown in Fig. 6 are cylindrical and thus provide space for free space between the filter bodies. It is understood that the filter bodies 3 do not have to be placed so close to each other that each filter body 3 is in contact with the surrounding filter bodies 3. Thanks to the end plate 34 which supports and fixes the filter bodies, the filter bodies 3 inside the filter element 12 can be placed sparingly and thereby not be in contact. together.
Fig. 7 shows a cross-sectional front view of a filter element 12. The filter element 12 has a cylindrical shape and a circular cross-sectional surface. In this embodiment, the filter element 12 is homogeneously filled with supporting structure 31. The supporting structure 31 is perforated in its longitudinal direction with filter bodies 3. The filter bodies 3 comprise an filter channel 33.
The inner surface of the filter body 3 is completely covered with an filter layer 32 having a first filter layer 32A and a second filter layer 32B. The suspension to be filtered flows inside the filter channels 33 and a part of the flowing suspension passes first through the first / inner surface of the filter layer 32A, then through the filter layer 32 and further through the second outer surface 32B of the filter layer 32 and continues through the supporting structure 31. the outside of the structure 31 and to the outside of the filter element 12 to be collected in the filter housing 10, 100, shown in Figs. 1 and 2.
In accordance with one embodiment of the invention, the lethality of green liquor filtrate should constitute a predetermined proportion of the total leachate leachate through the filter channels, while the total leachate lethality through the filtrate needs to be controlled to maintain the desired Reynolds number. With reference to F ig. 3, the fate and pressure of the filtrate in line 21 are measured together with the pressure in line 30 and the fate in line 22.
The filtrate flow is determined by factory conditions that require some production of purified green liquor and the pump 61 is controlled to provide the pressure in line 30 to meet this requirement. At the same time, the fate in line 22 is determined by means of a valve (not shown), so that the desired Reynolds number is maintained through the alter bodies.
The pressure difference between lines 21 and 30 provides information about the condition of the filter elements and is used to determine when the system needs to be switched off for cleaning.
Reynolds speech is used to characterize different ﬂ fate systems, such as laminar or turbulent ﬂ fate: laminar på fate occurs at low values of Reynolds speech, when viscous forces dominate, and is characterized by a smooth, constant ﬂ surface motion while 10 15 20 25 30 11 turbulent ﬂ fate occurs high values of Reynolds' speech and is dominated by the forces of inertia, which tend to produce random current vortices and other flow changes.
Reynolds numbers for ﬂ destiny in a tube they ﬁ are generally denoted as: pVD _ VD _ QD RE = ii i! Lffl ~ The mean velocity of our (uid (SI units: m / s) ~ D is the diameter (m) - p. Is the dynamic viscosity of the (uid (Pa-s or Ns / mz) ~ v is the kinematic viscosity (v = 1.1./ p) (mZ / s) vp is the density of the fluid (kg / m3) o Q is the volumetric flow (m3 / s) - A is the cross-sectional area of the duct (m2) As will be appreciated by those skilled in the art, a number of changes and modifications may be made to the above described. and other embodiments of the invention without departing from its scope as defined in the appended claims.
-For example, the filtration of the flowing suspension could of course be arranged in the opposite direction, so that the suspension flows on the outside of the filter elements and the filtrate passes the filter wall from the outside to the inside. This means that the filtrate flows on the inside of the filter channels in the filter elements.
Instead of a pump 61, 62 or 620, another arrangement could be used to force the suspension to flow into the filter, such as a pump to remove the filtrate from the filter and another pump to remove the slurry. The tank could be pressurized and thereby cause the liquid to flow through the filter or the tank 40 could be raised so that gravity provides the necessary pressure difference. The pump can be hydraulically or electrically driven. 10 15 20 25 30 35 12 The filter elements 12 can have other shapes such as presslterpress, capillaries, tubes, lamellae or discs etc.
As shown in Figs. 5B, the filter body 3 has a converging shape, but the filter body 3 could of course have a cylindrical extent, while the filter channel can be converging with a converging cross-sectional area.
The cross-sectional area of the filter bodies and filter channels could, of course, have other shapes such as triangular or rectangular shapes. If filter bodies with shapes other than cylindrical are used, the volume of the free spaces between the filter bodies in the filter elements will vary and depend on the shape of the filter bodies.
Porous materials other than ceramic materials could be used as the supporting structure 31, such as various polymers and burrs.
As for the filtration layer 32, other porous materials could be used, such as polymers.
It will be appreciated that in another embodiment, the supporting structure 31 of the filter body 3 could both have the function of being a supporting structure and at the same time constitute the filtering layer itself. No additional coating with filtration properties on the inner surface of the supporting structure 31 would then be needed.
Figs. 3 and 4 show an existing green liquor treatment plant supplemented with a transverse filter. The staple 90 in the existing green liquor treatment plant is an example of common known technology for clearing green liquor. It will be appreciated that existing green liquor treatment plants incorporating the prior art, such as conventional green liquor filters, may also be supplemented with a transverse filter.
It will also be appreciated that there may, of course, be other solutions within the scope of the invention as to how the filter fate and Reynolds number may be regulated.
The cross-flow filter can be used for purifying other suspensions in sulphate pulp mills, eg white liquor.
The cross-flow filter can be a replacement for an already existing green liquor treatment unit. The following advantages are obtained with the present invention when used in the filtration of green liquor and similar suspensions: The filtration process is a continuous process in which no filter cake is built up, which are desirable features. “It is also a very efficient process that results in a very high degree of sludge separation, up to almost 100%.
The filtered green liquor is almost free of slurry.
Under normal operating conditions, the characteristic green color of the green liquor is removed, which simplifies the identification of disturbances in the filtration process and in the recovery boiler.
The investment costs for cross-destructive filtration equipment are only a fraction of the investment costs for conventional treatment systems.
The space needed is much smaller than the space needed for sedimentation tank carriages.
There is no contact with the ambient air, nor is compressed air used in the equipment, which minimizes oxidation / decomposition of the valuable sul ﬁ content in the green liquor.
The closed system, which is not in contact with ambient air or uses a vacuum, means that the temperature of the green liquor is maintained at a high level.
The modular design of the filters facilitates a gradually increasing capacity increase with minimal investment costs. Fewer personnel are needed for overhaul and maintenance due to the system 'being simple with few moving parts.
Advantages due to fewer particles in the green liquor: 0 Less replacement lime or lower content of inert in the lime at the same ﬂ fate of replacement lime.
I 0 Less sludge transfer improves white liquor clarification and improves mesa dewatering and lowers energy consumption. i 0 Effective removal of process-promoting substances leads to minimal operating costs and small landfill volumes.

权利要求:
Claims (38)
[1]
A green liquor clarification comprising filtering a destructive suspension containing solid particles, the suspension being brought into contact with a first filter unit (4), said filter unit comprising one or more filter elements (12), containing one or more filter bodies (3), having filter channels ( 33) inside the filter bodies (3) with a filtration layer (32), a part de of the suspension is forced to pass through the filtration layer from a first / inner surface (32A) to a second / outer surface (32B) of the filtration layer (32) forming a filtrate while the solid particles mainly remain in a remaining part of the suspension forming a slurry characterized in that the filtration layer (32) is made of a membrane material with pores and that said pores have a pore size of 0.1 - 10 micrometers, more preferably 0.1 - 5 micrometers and most preferably 0.2 ~ 1.0 micrometers.
[2]
Green liquor according to claim 1, characterized in that said suspension is forced to da into the ﬂ filter body (3).
[3]
Green liquor clearance according to one of the preceding claims, characterized in that the destructive suspension has a Reynolds number between 10,000 - 45,000, more preferably 10,000 - 25,000 and most preferably 12,000 - 17,000.
[4]
Green liquor clearance according to any one of the preceding claims, characterized in that said filtrate should be less than 50%, preferably less than 40% and most preferably less than 30% but not less than 5% of the destructive suspension.
[5]
Green liquor clearance according to any one of the preceding claims, characterized in that said membrane material is ceramic.
[6]
Green liquor clearance according to one of the preceding claims, characterized in that said filter element (12) comprises a number of filter channels (33) with an inner diameter of 1-10 mm.
[7]
Green liquor clearance according to Claim 6, characterized in that the length of the kanterter channels (33) is preferably 0.5 - 3 m, more preferably 0.7 - 2.2 m and most preferably 0.8 - 1.5 m.
[8]
Green liquor clarification according to any one of the preceding claims, characterized in that the suspension is forced to ﬂ into the ﬁ filter unit (4) by a pump (61). 10 15 20 25 30 35 15
[9]
Green liquor clearance according to any one of the preceding claims, characterized in that a partial flow of said slurry is caused to recirculate and re-enter said filter unit (4) together with said flowing suspension.
[10]
Green liquor clearance according to one of the preceding claims, characterized in that the filter channels (33) have a circular cross-sectional area.
[11]
Green liquor clarification according to one of Claims 1 to 9, characterized in that the filter channels (33) have a converging cross-sectional area.
[12]
Green liquor clamping according to any one of the preceding claims, characterized in that said first filter unit (4) is connected in series with at least one further filter unit (4 ') in such a way that a partial flow of the slurry from the first filter unit (4) is led to an inlet to the additional filter unit (4 ') for further filtration.
[13]
Green liquor clamping according to any one of claims 1 to 11, characterized in that said first filter unit (4) is connected in parallel with at least one further filter unit (4).
[14]
Green liquor filtration according to claim 13, characterized in that said parallel-connected filter units (4) are connected in series to at least one further filter unit (4 ').
[15]
Green liquor clearance according to one of Claims 1 to 11, characterized in that said filter unit (4) is connected to an already significant green liquor purification unit.
[16]
Green liquor filtration according to claim 15, characterized in that said filter unit (4) is arranged as a first filtration step before final purification of the remaining slurry in the already existing purification unit.
[17]
Green liquor filtration according to Claim 15, characterized in that the filter unit (4) is arranged to filter already purified green liquor.
[18]
Green liquor clarification according to one of the preceding claims, characterized in that the flow of said filtrates is regulated by controlling said flowing suspension pressure.
[19]
Green liquor clarification according to any one of the preceding claims, characterized in that said Reynolds number is regulated by controlling the fate of said slurry. 10 15 20 25 30 35 16
[20]
A green liquor clarification device comprising filtering a flowing suspension containing solid particles, the suspension being brought into contact with at least one filter unit (4), said filter unit (4) comprising one or two filter elements (12) comprising one or three filter bodies (3). having filter channels (33) inside the filter bodies (3) with a filter layer (32), a part of the suspension is forced to pass through the filter layer from a first / inner surface (32A) to a second / outer surface (32B) of the filter layer (32) forming an filtrate while the solid particles mainly remain in a remaining part of the suspension forming a slurry, characterized in that the filtration layer (3 2) is made of a membrane material with pores and that said pores have a pore size of 0.1 - 10 micrometers, more preferably 0.1 - 5 micrometers and most preferably 0.2 - 1.0 micrometers.
[21]
Device according to claim 20, characterized in that said suspension is forced to ﬂ into the ﬁ filter body (3).
[22]
Device according to any one of claims 20 to 21, characterized in that the destructive suspension has a Reynolds number between 10,000 - 45,000, more preferably 10,000 - 25,000 and most preferably 12,000 ~ 17,000.
[23]
Device according to any one of claims 20 to 22, characterized in that said atlrate should be less than 50%, preferably less than 40% and most preferably less than 30% but not less than 5% of the ﬂbearing suspension.
[24]
Device according to any one of claims 20 to 23, characterized in that said membrane material is ceramic.
[25]
Device according to any one of claims 20 to 24, characterized in that said filter element (12) comprises a number of filter channels (33) with an inner diameter of 1-10 mm.
[26]
Device according to claim 25, characterized in that the length of the filter channels (33) is preferably 0.5 - 3 m, more preferably 0.7 - 2.2 m and most preferably 0.8 - 1.5 m.
[27]
Device according to any one of claims 20 to 26, characterized in that the suspension is forced to flow into said filter unit (4) by a pump (61). 10 15 20 25 30 35 17
[28]
Device according to one of Claims 20 to 27, characterized in that a part ﬂ is deserted. of said slurry is made to recycle and re-enter said filter unit (4) together with said destructive suspension.
[29]
Device according to one of Claims 20 to 28, characterized in that the filter channels (33) have a circular cross-sectional area.
[30]
Device according to one of Claims 20 to 28, characterized in that the filter channels (33) have a converging cross-sectional area.
[31]
Device according to any one of claims 20 to 30, characterized in that said 'first alternator unit (4) is connected in series with at least one further alternator unit (4') in such a way that a part ﬂ of the slurry from the first alternator unit (4) is led to an inlet to the further filter unit (4 ') for a further filtration.
[32]
Device according to any one of claims 20 to 30, characterized in that said main filter unit (4) is connected in parallel with at least one further filter unit (4).
[33]
Device according to claim 32, characterized in that said parallel-connected filter units (4) are connected in series to at least one further filter unit (4 ').
[34]
Device according to any one of claims 20 to 30, characterized in that said filter unit (4) is connected to an already existing green liquor purification unit.
[35]
Device according to claim 34, characterized in that said filter unit (_4) is arranged as a first filtration step for final purification of the remaining slurry in the already significant purification unit. in
[36]
Device according to claim 34, characterized in that the filter unit (4) is arranged to filter already purified green liquor.
[37]
Device according to any one of claims 20 to 36, characterized in that the fate of said filtrate is regulated by controlling the pressure of said destructive suspension.
[38]
Device according to any one of claims 20 to 37, characterized in that said Reynolds speech is regulated by controlling the flow of said slurry.

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同族专利:

公开号 | 公开日

EP2414585A4|2013-08-28|

EP2414585A1|2012-02-08|

PL2414585T3|2019-09-30|

ES2748879T3|2020-03-18|

BRPI1010310B1|2019-12-24|

US20120125849A1|2012-05-24|

SE533833C2|2011-02-01|

US9938664B2|2018-04-10|

EP2414585B8|2019-06-19|

BRPI1010310A2|2016-03-15|

PT2414585T|2019-06-17|

EP2414585B1|2019-05-01|

US20170051454A1|2017-02-23|

WO2010114468A1|2010-10-07|

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法律状态:

优先权:

申请号 | 申请日 | 专利标题

SE0950213A|SE533833C2|2009-04-02|2009-04-02|Method and apparatus for clearing green liquor|SE0950213A| SE533833C2|2009-04-02|2009-04-02|Method and apparatus for clearing green liquor|

PT10759123T| PT2414585T|2009-04-02|2010-03-30|Method and arrangement for clarifying green liquor|

PCT/SE2010/050348| WO2010114468A1|2009-04-02|2010-03-30|Method and arrangement for clarifying green liquor|

EP10759123.2A| EP2414585B8|2009-04-02|2010-03-30|Method and arrangement for clarifying green liquor|

PL10759123T| PL2414585T3|2009-04-02|2010-03-30|Method and arrangement for clarifying green liquor|

ES10759123T| ES2748879T3|2009-04-02|2010-03-30|Procedure and provision for the clarification of green liquor|

US13/257,606| US20120125849A1|2009-04-02|2010-03-30|Method and arrangement for clarifying green liquor|

US15/187,210| US9938664B2|2009-04-02|2016-06-20|Method and arrangement for clarifying green liquor|

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