CN210974166U - Slurry treatment device and flue gas limestone wet desulphurization device - Google Patents
Slurry treatment device and flue gas limestone wet desulphurization device Download PDFInfo
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- CN210974166U CN210974166U CN201920823197.7U CN201920823197U CN210974166U CN 210974166 U CN210974166 U CN 210974166U CN 201920823197 U CN201920823197 U CN 201920823197U CN 210974166 U CN210974166 U CN 210974166U
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- 239000002002 slurry Substances 0.000 title claims abstract description 224
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000003546 flue gas Substances 0.000 title claims abstract description 30
- 235000019738 Limestone Nutrition 0.000 title claims description 36
- 239000006028 limestone Substances 0.000 title claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 118
- 238000001914 filtration Methods 0.000 claims abstract description 74
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 72
- 230000023556 desulfurization Effects 0.000 claims abstract description 72
- 239000008213 purified water Substances 0.000 claims abstract description 28
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 24
- 239000002351 wastewater Substances 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims description 30
- 238000000926 separation method Methods 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 11
- 230000003009 desulfurizing effect Effects 0.000 claims description 8
- 239000000706 filtrate Substances 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 6
- 238000004537 pulping Methods 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims 2
- 238000010276 construction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 10
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000000779 smoke Substances 0.000 abstract description 3
- 238000009833 condensation Methods 0.000 abstract description 2
- 230000005494 condensation Effects 0.000 abstract description 2
- 238000002203 pretreatment Methods 0.000 abstract description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 21
- 239000002245 particle Substances 0.000 description 11
- 239000000047 product Substances 0.000 description 8
- 239000010440 gypsum Substances 0.000 description 7
- 229910052602 gypsum Inorganic materials 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 5
- 239000012065 filter cake Substances 0.000 description 5
- 239000010802 sludge Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009295 crossflow filtration Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
A slurry treatment apparatus and a wet flue gas desulfurization apparatus, the slurry treatment apparatus comprising: a slurry inlet (1), a slurry outlet (2), a purified water outlet (3), a circulating pump (4) of a treatment device and a water filtering component (5); the circulating pump (4) of the treatment device and the water filtering component (5) are connected through a pipeline to form a first circulating loop. The device can be used for smoke plume treatment work of a condensation method, pre-treatment in a desulfurization wastewater zero-discharge system, desulfurization wastewater treatment and the like, can prevent blockage caused by calcium sulfate with too high concentration, avoids the problem of dead-end filtration, and has small maintenance workload; the structure is simple, and the slurry is fully treated; low manufacturing and operating cost, stable operation and low energy consumption.
Description
Technical Field
The utility model relates to a thick liquid processing apparatus and flue gas limestone wet flue gas desulfurization device.
Background
In a limestone wet flue gas desulfurization system, desulfurization slurry is driven by a slurry circulating pump and flows through a desulfurization slurry pool, a pipeline, a slurry pump, a pipeline and a spray pumpSpraying by the nozzle of the spraying device, mixing the high-temperature raw flue gas with the desulfurization slurry, performing heat and mass transfer, evaporating part of water in the desulfurization slurry, reducing the temperature of the flue gas, increasing the humidity to saturation, and adding SOnThe (sulfur dioxide/sulfur trioxide) and dust are removed and enter into the desulfurization slurry, and the treated flue gas is discharged out of the limestone wet desulfurization tower and enters into the atmosphere. And concentrating the desulfurized slurry, and returning to the slurry pool for continuous recycling. In order to maintain the desulfurization ability of the desulfurization slurry, it is necessary to constantly replenish the fresh limestone slurry. With the repeated recycling of the desulfurization slurry, chloride ions in water, limestone, raw flue gas and the like used for preparing the desulfurization slurry are continuously enriched in the desulfurization slurry, and the concentration of the desulfurization slurry is continuously improved. When the concentration of chloride ions in the desulfurization slurry is too high (generally not higher than 20000mg/l), the corrosiveness of the desulfurization slurry is greatly increased, the corrosion to metal materials of a desulfurization system is increased, and the desulfurization efficiency is reduced. In order to solve these problems, when the concentration of chloride ions in the desulfurization slurry tank is higher than a normal value, part of the water containing chloride ions in the desulfurization slurry needs to be separated and discharged to the outside. In order to reduce the influence on the external system, the part needs to be treated to reduce particles such as suspended matters in the part. At present, the conventional technology adopts a chemical adding process such as a triple box, and flocculating and precipitating particles such as suspended matters, desulfurized gypsum and the like in water by adding a flocculating agent or other medicaments into the water, and discharging purified water which removes the particles such as the suspended matters, the desulfurized gypsum and the like out of a system, for example, discharging the purified water to the outside of a plant or entering other systems. The settled suspended matter and other particles form sludge, and the sludge is discharged or the filter pressing system is used for discharging the sludge. The main problems with this technique are: (1) the system is complex, the investment is high, and the maintenance amount is large; (2) the dosing cost is high; (3) difficult sludge treatment, solid waste formation, increased environmental pollution and the like.
On the other hand, in order to maintain the normal and stable operation of the desulfurization system, the liquid level of the slurry tank needs to be maintained within a certain range. That is, the moisture entering the limestone wet desulfurization tower and the moisture exiting the limestone wet desulfurization tower should be in a certain balance. In the currently developed smoke plume treatment work, the outlet temperature and humidity of the limestone wet desulphurization tower need to be kept at lower levels, so that the moisture taken away by the flue gas flowing out of the limestone wet desulphurization tower is reduced, and the difficulty is brought to the water balance of a desulphurization system. Sometimes, even if the amount of process water used in the limestone wet desulfurization tower is reduced as much as possible, the water balance in the desulfurization system cannot be maintained. For this purpose, it is necessary to extract a certain amount and quality of water from the desulfurization slurry. However, there is currently no relatively simple, economical process.
If the slurry in the desulfurization system is simply discharged, on one hand, the slurry cannot be fully utilized, slurry and water resources are wasted, and on the other hand, the slurry cannot be directly discharged due to the fact that the slurry does not meet the discharge standard, further treatment is needed, and the treatment cost is increased.
If the moisture in the slurry is distilled out in a flash evaporation mode and reused, the water content in the slurry recycled in the limestone wet desulphurization tower is reduced, the concentrations of sulfur-containing substances and various pollutants are increased, the pH value is reduced, the desulphurization and dust removal effects are reduced, and the concentrations of various substances are increased, so that the spraying system is not uniform in spraying, the atomization effect is reduced, and the desulphurization, dust removal and other effects are affected. Moreover, the non-condensable gases are pumped out by a vacuum pump during the flash evaporation process, which can also cause additional environmental pollution. Moreover, the flash evaporation device has high manufacturing cost, large occupied space and large energy consumption during operation.
In addition, in the desulfurization wastewater zero discharge work which is currently carried out, the desulfurization wastewater generally needs to be subjected to pre-treatment, and the chemical-adding flocculation precipitation process is mainly adopted at present, so that the problem which is the same as that of the triple box process exists.
In the cross-flow type filtering device, feed liquid containing solid particles with certain concentration to be processed flows in a filtering pipe along the axial direction of the filtering pipe, partial water and smaller particles in the feed liquid flow along the radial direction of the filtering pipe and permeate to the periphery of the pipe wall of the filtering pipe through micropores on the pipe wall of the filtering pipe to form purified water (filtrate) with less solid particle content and smaller particle size, and the feed liquid and the purified water form a cross-flow form in the filtering pipe and the pipe wall. However, in the conventional cross-flow filtration device, when the feed liquid flows along the axial direction of the filtration tube in a single direction, the feed liquid cannot permeate through the larger particles on the wall of the filtration tube, and the feed liquid still has the possibility of sticking to, hanging on, or even forming a filter cake on the inner wall of the filtration tube, thereby affecting the filtration efficiency of the filtration device and increasing the maintenance workload.
In addition, in the existing wet flue gas limestone desulfurization device, the problems that the incoming material in the cross-flow type filtering device has high calcium sulfate concentration, and crystallization and blockage are easy to separate out exist.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a slurry treatment device and a flue gas limestone wet desulphurization device.
The utility model discloses a thick liquid processing apparatus, a serial communication port, include: the water filter comprises a slurry inlet 1, a slurry outlet 2, a purified water outlet 3, a treatment device circulating pump 4 and a water filtering component 5, wherein the water filtering component 5 is a cross-flow filtering water filtering component and comprises a shell 51, a filter element 52, a first slurry interface 53, a second slurry interface 54 and a purified water interface 55; the filter element 52 is arranged in the shell 51, and the filter element 52 comprises a filter pipe 52 a; the first slurry port 53 and the second slurry port 54 communicate with the end openings of the filtering pipes 52 a; the wall of the filtering pipe 52a is provided with a plurality of filtering holes, and one or more filtering pipes 52a are provided; a purified water space 56 is formed at the periphery of the filtering pipe 52a, the purified water space 56 is communicated with the purified water connector 55, and the purified water connector 55 is communicated with the purified water outlet 3;
the first slurry port 53 is communicated with the inlet or outlet of the treatment device circulating pump 4 through a pipeline, and correspondingly, the second slurry port 54 is communicated with the outlet or inlet of the treatment device circulating pump 4 through a pipeline; the circulating pump 4 of the treatment device and the water filtering component 5 are connected through a pipeline to form a first circulating loop; the slurry inlet 1 and the slurry outlet 2 are respectively communicated with any two positions of the first circulation loop.
The slurry inlet 1 is used for inputting slurry to be treated. Under the drive of the circulating pump 4 of the treatment device, the slurry is circularly filtered in the water filtering component 5. The number of cycles can be controlled by adjusting the diameter of the slurry outlet 2 pipe or the opening of the valve. The slurry outlet 2 is used for outputting slurry with higher concentration after being circularly filtered by the filter pipe 52 a; the purified water outlet 3 is used for outputting filtrate (also called product water and purified water).
The water filtering component 5 adopts a cross-flow water filtering mode. That is, the slurry flows axially in filter tube 52a and the product water flows radially in the wall of filter tube 52a, forming a cross-flow therebetween. The slurry flowing axially in the filtering pipe 52a can timely wash away fine particles such as suspended matters and the like stuck and hung on the pipe wall of the filtering pipe 52a at a certain flow velocity, thereby reducing or even avoiding the formation of a filter cake, ensuring the stable operation of the water filtering component 5 and reducing the maintenance amount.
Preferably, the slurry treatment device further comprises a forward and reverse switching valve group 6, wherein the forward and reverse switching valve group 6 comprises a first material inlet valve 61, a second material inlet valve 62, a first material outlet valve 63 and a second material outlet valve 64; the inlet ends of the first feeding valve 61 and the second feeding valve 62 are both communicated with the outlet of the treatment device circulating pump 4, and the outlet ends are respectively communicated with the first slurry interface 53 and the second slurry interface 54; the outlet ends of the first discharge valve 63 and the second discharge valve 64 are both communicated with the inlet of the treatment device circulating pump 4, and the inlet ends are respectively communicated with the first slurry interface 53 and the second slurry interface 54; the water filtering component 5 and the treatment device circulating pump 4 are connected with a pipeline through a forward and reverse switching valve group 6 to form a first circulating loop.
The first discharging valve, the second discharging valve and the switch state of the second discharging valve are alternately changed at intervals (automatic alternate operation can be realized by arranging an automatic control device and an electric valve), alternate operation of a forward flow mode and a reverse flow mode can be realized, alternate change of flow direction intervals of feed liquid in the filter pipe is realized, alternate flushing of the feed liquid to forward/reverse intervals of attachments on the pipe wall of the filter pipe is realized, thereby the attachments on the pipe wall of the filter pipe are greatly reduced, the occurrence of a filter cake phenomenon is avoided, the working efficiency of the water filtering device is greatly improved, and the maintenance workload is reduced.
Preferably, in the slurry processing apparatus, the first feeding valve 61 and the second discharging valve 64 are an integrated three-way valve structure, and the three-way valve has two positions, position 1: the first feeding valve 61 is opened, and the second discharging valve 64 is closed; position 2: the first feeding valve 61 is closed, and the second discharging valve 64 is opened; and/or the second material feeding valve 62 and the first material discharging valve 63 are of an integrated three-way valve structure, and the three-way valve has two positions, position 1: the second feeding valve 32 is closed, and the first discharging valve 33 is opened; position 2: the second discharge valve 62 is opened and the first discharge valve 63 is closed;
or,
the first feeding valve 61 and the second feeding valve 62 are of an integrated three-way valve structure, and at this time, the three-way valve has two positions, position 1: the first feeding valve 61 is opened and the second feeding 62 is closed; position 2: the first feeding valve 61 is closed, the second feeding valve 62 is opened, and/or the first discharging valve 63 and the second discharging valve 64 are integrated into a three-way valve structure, and the three-way valve has two positions, position 1: the first discharging valve 63 is opened, and the second discharging valve 64 is closed; position 2: the first outlet valve 63 is closed and the second outlet valve 64 is opened.
Preferably, in the slurry treatment device, two or more water filtering components 5 are used in series or two or more water filtering components are used in parallel. Two or more water filtering components 5 can be used in series, so that the advantage is that the water yield of the product can be increased under the condition that the flow of the circulating pump 5 is not increased, but the pump head is high; two or more of these can be used in parallel, which has the advantage of increasing the product water volume without increasing the pump head, but requires a large pump flow.
Preferably, in the slurry treatment device, the filter element 52 of the water filtering assembly 5 further comprises a first tube plate 52b and a second tube plate 52 c; the first tube plate 52b and the second tube plate 52c are provided with through holes; one end of the filter tube 52a penetrates or passes through the through hole of the first tube plate 52b, and the other end penetrates or passes through the through hole of the second tube plate 52 c; the shell 51 and the first tube plate 52b form a first chamber 57, one end of the filter tube 52a is opened to communicate with the first chamber 57, the shell 51 and the second tube plate 52c form a second chamber 58, and the other end of the filter tube 52a is opened to communicate with the second chamber 58; the space formed by the shell 51, the first tube plate 52b, the second tube plate 52c and the filter tube 52a at the periphery of the filter tube 52a constitutes the purified water space 56.
Preferably, in the slurry treatment apparatus, the housing 51 of the water filtering component 5 includes a body part 51a, a first sealing head 51b and a second sealing head 51c, the body part 51a, the first sealing head 51b and the second sealing head 51c are integrally formed or assembled separately, or the first sealing head 51b and the second sealing head 51c are pipes of the water filtering component 5 connected to the forward and reverse switching valve set 6;
the first tube plate 52b is arranged at the joint of the body part 51a of the shell 51 and the first head 51b, and the second tube plate 52c is arranged at the joint of the body part 51a of the shell 51 and the second head 51 c; the first end socket 51b and the first tube plate 52b form the first chamber 57, and an end opening of the filter tube 52a is communicated with the first chamber 57; the second end socket 51c and the second tube plate 52c form the second chamber 58; the other end of the filter pipe 52a is opened to communicate with the second chamber 58; the body part 51a of the housing 51, the first tube sheet 52b, the second tube sheet 52c and the filter tube 52a form the clean water space 56 at the periphery of the filter tube 52 a;
the first slurry interface 53 is arranged on the first end socket 51b, and the second slurry interface 54 is arranged on the second end socket 51 c; or the first chamber 57 is divided into a first branch chamber and a second branch chamber, the first slurry interface 53 is arranged at the seal head corresponding to the first branch chamber, and the second slurry interface 54 is arranged at the seal head corresponding to the second branch chamber;
the clean water port 55 is provided on a side wall of the housing body portion 51 a.
Preferably, in the slurry processing apparatus, the water purification space 56 is divided into two or more separated branched filtrate spaces, and a water purification interface 55 is respectively disposed on a side wall of the housing 51 corresponding to each branched filtrate space.
Preferably, in the slurry treatment device, the aperture of the filter holes arranged on the wall of the filter pipe 52a is 0.01-50 microns, and the length of the filter pipe 52a is 20-300 cm.
Preferably, in the slurry treatment apparatus, the filter pipe 52a is a ceramic membrane filter pipe or a metal membrane filter pipe. The ceramic membrane filter tube or the metal membrane filter tube can adopt related products in the market at present.
Preferably, the slurry treatment device is used for filtering desulfurization slurry or desulfurization wastewater in a flue gas limestone wet desulfurization device.
On the other hand, the utility model also provides a flue gas limestone wet desulphurization device, which is characterized by comprising the slurry treatment device I, one or two desulphurization towers II, a slurry discharge pump III, a slurry separation device IV and an optional slurry collection device; a slurry pool II-1 is arranged at the bottom of the desulfurizing tower II; the inlet of the slurry discharge pump III is communicated with the slurry pool II-1 or a slurry collecting device, the outlet of the slurry discharge pump III is communicated with the inlet of the slurry separating device IV, the outlet of the slurry separating device IV is communicated with the slurry inlet 1 of the slurry processing device I, and the slurry outlet 2 of the slurry processing device I is communicated with any one of the desulfurizing tower II or the slurry collecting device; and the slurry treatment device I, the desulfurizing tower II, the slurry discharge pump III, the slurry separation device IV and an optional slurry collection device are connected through pipelines to form a second circulation loop.
The slurry collecting device may be a box-type, tank-type, pool-type, pit-type, or the like slurry collecting device, and may be any container having a certain buffer storage volume.
Preferably, in the wet flue gas limestone desulfurization device, the slurry separation device IV may be a cyclone device, such as a gypsum cyclone commonly used in conventional desulfurization systems. Simple structure and low price. A vacuum belt extractor, such as the gypsum vacuum belt extractor commonly used in conventional desulfurization systems, may also be used. Or may be a disc dehydrator. Of course these devices may also be used in combination.
Preferably, the wet flue gas limestone desulfurization device is characterized by further comprising a calcium sulfate undersaturation water system, wherein the calcium sulfate undersaturation water system is communicated with the slurry inlet 1. The undersaturated water of calcium sulfate is injected, so that the crystallization and scaling of calcium sulfate can be solved.
Preferably, the wet flue gas limestone desulfurization device further comprises a limestone pulping system, and the desulfurization tower II is communicated with the limestone pulping system.
The communication described herein may be direct connection communication or indirect communication through a conduit or other passage, unless otherwise specifically limited.
The device of the utility model can be used for the smoke plume treatment work by the condensation method; the device is used for pretreatment, desulfurization wastewater treatment and the like in a desulfurization wastewater zero-discharge system, can replace the traditional triple box process, and solves the problems of water balance, chloride ion concentration and sludge discharge in a wet desulfurization system. And, the utility model discloses the device can prevent the jam that the calcium sulfate of too high concentration leads to, avoids dead end filterable problem. The on-off states of the first material inlet valve, the first discharge valve, the second material inlet valve and the second discharge valve are alternately changed at intervals, so that the flowing direction of the material liquid in the filter pipe is alternately changed at intervals, attachments on the pipe wall of the filter pipe are greatly reduced, the filter cake phenomenon is avoided, and the working efficiency of the water filtering device is greatly improved. The device has simple structure and small occupied space, and can treat the slurry or the desulfurization wastewater to the required degree according to the requirement; the requirements on the circulating pump, the slurry discharge pump and other pumps of the treatment device are low, the manufacturing cost is low, the operation is stable, the energy consumption is low, the operation cost is low, and the maintenance workload is small.
Drawings
FIG. 1 is a schematic view of an embodiment of the slurry treatment apparatus of the present invention.
Fig. 2 is a schematic view of an embodiment of the water filter assembly 5 of the present invention.
Fig. 3 is a schematic view of another embodiment of the slurry treatment apparatus of the present invention.
Fig. 4 is a schematic view of another embodiment of the slurry treatment apparatus of the present invention.
Fig. 5 is a schematic view of another embodiment of the water filter assembly 5 of the present invention.
Fig. 6 is a schematic diagram of an embodiment of the wet flue gas desulfurization device using limestone.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It should be understood that the embodiments described herein are for illustrative purposes only and are not intended to limit the present invention. Wherein like parts are given like reference numerals.
Fig. 1 shows the schematic diagram of an embodiment of the slurry treatment device for filtering desulfurization slurry in a flue gas limestone wet desulphurization device, and fig. 2 shows the schematic diagram of an embodiment of the water filtering component 5.
As shown in fig. 1 and 2, the slurry processing apparatus according to one embodiment includes: a slurry inlet 1, a slurry outlet 2, a purified water outlet 3, a treatment device circulating pump 4 and a water filtering component 5.
The water filtering component 5 is a cross-flow filtering water filtering component, and comprises a shell 51, a filter element 52, a first slurry interface 53, a second slurry interface 54 and a purified water interface 55. The housing 51 includes a body portion 51a, a first head 51b, and a second head 51 c.
The filter element 52 is disposed within the housing 51. The cartridge 52 includes a plurality of filter tubes 52a, a first tube sheet 52b, and a second tube sheet 52 c. The wall of the filtering pipe 52a is provided with a plurality of filtering holes.
The first tube plate 52b is arranged at the joint of the body part 51a of the shell 51 and the first head 51b, and the second tube plate 52c is arranged at the joint of the body part 51a of the shell 51 and the second head 51 c; the first tube plate 52b and the second tube plate 52c are provided with through holes; one end of the filter tube 52a penetrates or passes through the through hole of the first tube plate 52b, and the other end penetrates or passes through the through hole of the second tube plate 52 c; the first end socket 51b and the first tube plate 52b form the first chamber 57, and an end opening of the filter tube 52a is communicated with the first chamber 57; the second end socket 51c and the second tube plate 52c form the second chamber 58; the other end of the filter pipe 52a is opened to communicate with the second chamber 58;
the body portion 51a of the housing 51, the first tube sheet 52b, the second tube sheet 52c, and the filter tubes 52a form a space around the filter tubes 52a to constitute the clean water space 56.
The first slurry port 53 is provided in the first head 51b and communicates with the end opening of the filter pipe 52a through the first chamber 57, and the second slurry port 54 is provided in the second head 51c and communicates with the other end opening of the filter pipe 52a through the second chamber 58.
The water purifying port 55 is provided on a side wall of the housing body portion 51a, and the water purifying space 56 is communicated with the water purifying port 55.
The first slurry port 53 is communicated with the inlet or outlet of the treatment device circulating pump 4 through a pipeline, and correspondingly, the second slurry port 54 is communicated with the outlet or inlet of the treatment device circulating pump 4 through a pipeline; the circulating pump 4 of the treatment device and the water filtering component 5 are connected through a pipeline to form a first circulating loop; the slurry inlet 1 and the slurry outlet 2 are respectively communicated with any two positions of the first circulation loop.
The slurry inlet 1 is used for inputting slurry to be treated. Under the drive of the circulating pump 4 of the treatment device, the slurry is circularly filtered in the water filtering component 5. The slurry outlet 2 is used for outputting slurry with higher concentration after being circularly filtered by the filter pipe 52 a; the purified water outlet 3 is used for outputting filtrate (also called product water and purified water).
The water filtering component 5 adopts a cross-flow water filtering mode. That is, the slurry flows axially in filter tube 52a and the product water flows radially in the wall of filter tube 52a, forming a cross-flow therebetween. The slurry flowing axially in the filtering pipe 52a can timely wash away fine particles such as suspended matters and the like stuck and hung on the pipe wall of the filtering pipe 52a at a certain flow velocity, thereby reducing or even avoiding the formation of a filter cake, ensuring the stable operation of the water filtering component 5 and reducing the maintenance amount.
Fig. 3 is a schematic view showing another embodiment of the slurry treatment apparatus of the present invention. As shown in fig. 3, the slurry treatment apparatus comprises two water filtration modules 5 in series.
Fig. 4 is a schematic view showing another embodiment of the slurry treatment apparatus of the present invention. As shown in fig. 4, the slurry treatment apparatus further includes a forward/reverse switching valve group 6. The forward and reverse switching valve group 6 comprises a first material inlet valve 61, a second material inlet valve 62, a first discharge valve 63 and a second discharge valve 64; the inlet ends of the first feeding valve 61 and the second feeding valve 62 are both communicated with the outlet of the treatment device circulating pump 4, and the outlet ends are respectively communicated with the first slurry interface 53 and the second slurry interface 54; the outlet ends of the first discharge valve 63 and the second discharge valve 64 are both communicated with the inlet of the treatment device circulating pump 4, and the inlet ends are respectively communicated with the first slurry interface 53 and the second slurry interface 54; the water filtering component 5 and the treatment device circulating pump 4 are connected with a pipeline through a forward and reverse switching valve group 6 to form a first circulating loop.
The first feeding valve 61, the second feeding valve 62, the first discharging valve 63 and the second discharging valve 64 are matched in opening and closing manner as follows: the first supply valve 61 is open and the second supply valve 32 is closed; the first outlet valve 33 is opened and the second outlet valve 64 is closed; alternatively, the first supply valve 61 is closed and the second supply valve 62 is opened; the first outlet valve 63 is closed and the second outlet valve 64 is opened.
Fig. 5 shows a schematic view of another embodiment of the water filter assembly 5 of the present invention. The first chamber 57 is divided into a first branch chamber 57-1 and a second branch chamber 57-2, the first slurry port 53 is provided at a head corresponding to the first branch chamber 57-1, and the second slurry port 54 is provided at a head corresponding to the second branch chamber 57-2. This has the advantage that the device is compact and the connecting conduit is short.
Fig. 6 is a schematic diagram of an embodiment of the wet flue gas desulfurization device using limestone. The wet flue gas limestone desulfurization device comprises a slurry treatment device I, a desulfurization tower II, a slurry discharge pump III and a slurry separation device IV (such as a gypsum cyclone); a slurry pool II-1 is arranged at the bottom of the desulfurizing tower II; the inlet of the slurry discharge pump III is communicated with the slurry pool II-1, the outlet of the slurry discharge pump III is communicated with the inlet of the slurry separation device IV, the outlet of the slurry separation device IV is communicated with the slurry inlet 1 of the slurry treatment device I, and the slurry outlet 2 of the slurry treatment device I is communicated with the desulfurization tower II; and the slurry treatment device I, the desulfurizing tower II, the slurry discharge pump III and the slurry separation device IV are connected through pipelines to form a second circulation loop.
Optionally, the wet flue gas limestone desulfurization device further comprises a calcium sulfate undersaturation water system V, and the calcium sulfate undersaturation water system is communicated with the slurry inlet 1.
The communication may be direct connection communication or indirect communication via a conduit or other passage, unless otherwise specifically defined. For example, a collecting device or (and) a conveying water pump can be arranged between the slurry inlet 1 and the slurry separation device IV; a collecting device or (and) a delivery water pump can be arranged between the slurry outlet 2 and the desulfurizing tower II
The utility model discloses flue gas limestone wet flue gas desulfurization device theory of operation as follows: the desulfurization slurry in a slurry pool II-1 of a desulfurization tower II is pumped into a slurry separation device IV through a slurry discharge pump III, primary solid-liquid separation is firstly carried out, the content of suspended matters, desulfurization gypsum and other particles of the desulfurization slurry is reduced, and optionally, calcium sulfate undersaturated water is injected into the desulfurization slurry (generally called overflow liquid, filtrate, desulfurization wastewater and the like in engineering) with lower concentration after the primary solid-liquid separation, so that the problems of calcium sulfate crystallization and scaling can be solved. And then the desulfurization slurry enters a slurry treatment device I through a slurry inlet 1 for multiple times of circulating treatment to continuously generate purified water (product water). After multiple cycles, the desulfurization slurry with higher concentration flows back to the desulfurization tower II.
Thus, the limestone wet desulphurization device forms a two-stage separation system: primary solid-liquid separation: the slurry from the slurry tank II-1 is subjected to primary solid-liquid separation by a slurry separation device IV. And (4) secondary separation, namely repeatedly circulating the slurry in a slurry treatment device I for many times, and fully finely filtering the slurry. This has the advantage that the burden on the fine filtration, i.e. the water filtration module 5, can be reduced by the primary solid-liquid separation, while the slurry separation unit IV for the primary solid-liquid separation can employ equipment with low separation requirements but high reliability, such as a gypsum cyclone, which is a solid-liquid separation equipment commonly used in desulfurization systems. The concentration of the particles of the desulfurized slurry after primary solid-liquid separation is greatly reduced, and the reliability, the stability and the water production capacity can be improved while the precision of the water filtering component 5 is ensured.
In the slurry treatment apparatus I, the circulation system is constituted by the treatment apparatus circulation pump 4 alone, and the slurry can be repeatedly circulated in the water filter unit 5 to sufficiently treat the slurry. The requirements on the slurry discharge pump III and the circulating pump 4 of the treatment device are greatly reduced, the production capacity of purified water is high, the device has a simple structure, occupies small space, and is low in manufacturing cost, stable in operation, low in energy consumption and low in operation cost.
Claims (13)
1. A slurry treatment apparatus, comprising: the water filter device comprises a slurry inlet (1), a slurry outlet (2), a purified water outlet (3), a treatment device circulating pump (4), a water filtering component (5) and an optional forward and reverse switching valve group (6), wherein the water filtering component (5) is a cross-flow filtering water filtering component and comprises a shell (51), a filter element (52), a first slurry interface (53), a second slurry interface (54) and a purified water interface (55); the filter element (52) is arranged in the shell (51), and the filter element (52) comprises a filter pipe (52 a); the first slurry port (53) and the second slurry port (54) are communicated with the end opening of the filter pipe (52 a); the wall of the filter pipe (52a) is provided with a plurality of filter holes, and one or more filter pipes (52a) are arranged; a purified water space (56) is formed at the periphery of the filter pipe (52a), the purified water space (56) is communicated with the purified water interface (55), and the purified water interface (55) is communicated with the purified water outlet (3);
the first slurry interface (53) is communicated with the inlet or the outlet of the treatment device circulating pump (4) through a pipeline, and correspondingly, the second slurry interface (54) is communicated with the outlet or the inlet of the treatment device circulating pump (4) through a pipeline; the circulating pump (4) of the treatment device and the water filtering component (5) are connected through a pipeline to form a first circulating loop; the slurry inlet (1) and the slurry outlet (2) are respectively communicated with any two positions of the first circulation loop;
unless expressly defined, the communication is direct connection communication, or indirect communication through a conduit or other passage;
the forward and reverse switching valve group (6) comprises a first material inlet valve (61), a second material inlet valve (62), a first discharge valve (63) and a second discharge valve (64); the inlet ends of the first feeding valve (61) and the second feeding valve (62) are communicated with the outlet of the treatment device circulating pump (4), and the outlet ends of the first feeding valve and the second feeding valve are respectively communicated with the first slurry interface (53) and the second slurry interface (54); the outlet ends of the first discharging valve (63) and the second discharging valve (64) are communicated with the inlet of the circulating pump (4) of the processing device, and the inlet ends of the first discharging valve and the second discharging valve are respectively communicated with the first slurry interface (53) and the second slurry interface (54); the water filtering component (5) and the circulating pump (4) of the treatment device are connected with a pipeline through a forward and reverse switching valve group (6) to form a first circulating loop.
2. The slurry processing apparatus according to claim 1, wherein the first tapping valve (61) and the second tapping valve (64) are of an integrated three-way valve construction, wherein the three-way valve has two positions, position 1: the first feeding valve (61) is opened, and the second discharging valve (64) is closed; position 2: the first feeding valve (61) is closed, and the second discharging valve (64) is opened; and/or the second material feeding valve (62) and the first material discharging valve (63) are of an integrated three-way valve structure, and the three-way valve has two positions, namely position 1: the second feeding valve (62) is closed, and the first discharging valve (63) is opened; position 2: the second feeding valve (62) is opened, and the first discharging valve (63) is closed;
or,
the first feeding valve (61) and the second feeding valve (62) are of an integrated three-way valve structure, and at the moment, the three-way valve has two positions, namely position 1: the first feeding valve (61) is opened, and the second feeding valve (62) is closed; position 2: the first feeding valve (61) is closed, the second feeding valve (62) is opened, and/or the first discharging valve (63) and the second discharging valve (64) are of an integrated three-way valve structure, and the three-way valve has two positions, namely position 1: the first discharging valve (63) is opened, and the second discharging valve (64) is closed; position 2: the first discharge valve (63) is closed and the second discharge valve (64) is opened.
3. A slurry treatment apparatus according to claim 1 or 2, characterized in that the water filtering components (5) are used in two or more series, or in two or more parallel.
4. The slurry treatment apparatus according to claim 3, wherein the filter element (52) of the water filtration assembly (5) further comprises a first tube sheet (52b) and a second tube sheet (52 c); the first tube plate (52b) and the second tube plate (52c) are provided with through holes; one end of the filter tube (52a) penetrates or passes through the through hole of the first tube plate (52b), and the other end penetrates or passes through the through hole of the second tube plate (52 c); the shell (51) and the first tube plate (52b) form a first chamber (57), one end opening of the filter tube (52a) is communicated with the first chamber (57), the shell (51) and the second tube plate (52c) form a second chamber (58), and the other end opening of the filter tube (52a) is communicated with the second chamber (58); the shell (51), the first tube plate (52b), the second tube plate (52c) and the space formed by the filter tube (52a) on the periphery of the filter tube (52a) form the water purifying space (56).
5. The slurry treatment device according to claim 4, wherein the housing (51) of the water filtering component (5) comprises a body part (51a), a first sealing head (51b) and a second sealing head (51c), the body part (51a), the first sealing head (51b) and the second sealing head (51c) are integrally formed or assembled by separation, or the first sealing head (51b) and the second sealing head (51c) are pipelines of the water filtering component (5) connected with the forward and reverse switching valve group (6);
the first tube plate (52b) is arranged at the joint of the body part (51a) of the shell (51) and the first end socket (51b), and the second tube plate (52c) is arranged at the joint of the body part (51a) of the shell (51) and the second end socket (51 c); the first end socket (51b) and the first tube plate (52b) form the first chamber (57), and one end opening of the filter tube (52a) is communicated with the first chamber (57); the second end socket (51c) and the second tube plate (52c) form the second chamber (58); the other end opening of the filter pipe (52a) is communicated with the second chamber (58); the body part (51a) of the shell (51), the first tube plate (52b), the second tube plate (52c) and the space formed by the filter tube (52a) at the periphery of the filter tube (52a) form the water purifying space (56);
the first slurry interface (53) is arranged on the first sealing head (51b), and the second slurry interface (54) is arranged on the second sealing head (51 c); or the first chamber (57) is divided into a first branch chamber and a second branch chamber, the first slurry interface (53) is arranged at the seal head corresponding to the first branch chamber, and the second slurry interface (54) is arranged at the seal head corresponding to the second branch chamber;
the water purifying port (55) is provided on a side wall of the housing body portion (51 a).
6. The slurry treatment apparatus according to claim 5, wherein the water purification space (56) is divided into two or more separated branched filtrate spaces, and a water purification port (55) is provided on a side wall of the housing (51) corresponding to each branched filtrate space.
7. The slurry treatment device according to claim 3, wherein the filter holes arranged on the wall of the filter pipe (52a) have a diameter of 0.01-50 μm, and the length of the filter pipe (52a) is 20-300 cm.
8. The slurry treatment apparatus according to claim 7, wherein the filter pipe (52a) is a ceramic membrane filter pipe or a metal membrane filter pipe.
9. The slurry treatment apparatus according to claim 3, wherein the slurry treatment apparatus is used for filtering desulfurization slurry or desulfurization wastewater in a flue gas limestone wet desulfurization apparatus.
10. A flue gas limestone wet desulphurization unit, characterized by comprising a slurry treatment unit (I) according to any one of claims 1 to 9, one or two desulphurization towers (II), a slurry discharge pump (III), a slurry separation unit (IV) and optionally a slurry collection unit; a slurry pool (II-1) is arranged at the bottom of the desulfurizing tower (II); the inlet of the slurry discharge pump (III) is communicated with the slurry pool (II-1) or a slurry collecting device, the outlet of the slurry discharge pump (III) is communicated with the inlet of the slurry separating device (IV), the outlet of the slurry separating device (IV) is communicated with the slurry inlet (1) of the slurry processing device (I), and the slurry outlet (2) of the slurry processing device (I) is communicated with any one of the desulfurization tower (II) or the slurry collecting device; the slurry treatment device (I), the desulfurizing tower (II), the slurry discharge pump (III), the slurry separation device (IV) and an optional slurry collection device are connected through pipelines to form a second circulation loop;
unless expressly limited, such communication is direct connection communication, or indirect communication through a conduit or other passage.
11. The wet flue gas limestone desulfurization device as claimed in claim 10, characterized in that the slurry separation device (IV) is a cyclone device and/or a vacuum belt dehydrator and/or a disc dehydrator.
12. The wet flue gas limestone desulfurization apparatus according to claim 10 or 11, characterized by further comprising a calcium sulfate undersaturation water system, which is in communication with the slurry inlet (1).
13. The wet flue gas limestone desulfurization apparatus according to claim 10 or 11, further comprising a limestone pulping system, wherein the desulfurization tower (II) is communicated with the limestone pulping system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115608160A (en) * | 2022-10-20 | 2023-01-17 | 国能唯真(山东)测试分析有限公司 | Wet flue gas desulfurization thick liquid filter equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115608160A (en) * | 2022-10-20 | 2023-01-17 | 国能唯真(山东)测试分析有限公司 | Wet flue gas desulfurization thick liquid filter equipment |
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