CN221131679U - Flue gas desulfurization and sulfur recovery system - Google Patents
Flue gas desulfurization and sulfur recovery system Download PDFInfo
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- CN221131679U CN221131679U CN202322896204.5U CN202322896204U CN221131679U CN 221131679 U CN221131679 U CN 221131679U CN 202322896204 U CN202322896204 U CN 202322896204U CN 221131679 U CN221131679 U CN 221131679U
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- bacterial liquid
- flue gas
- gas desulfurization
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 135
- 239000003546 flue gas Substances 0.000 title claims abstract description 135
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 111
- 230000023556 desulfurization Effects 0.000 title claims abstract description 111
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000011084 recovery Methods 0.000 title claims abstract description 44
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 36
- 239000011593 sulfur Substances 0.000 title claims abstract description 36
- 239000007788 liquid Substances 0.000 claims abstract description 217
- 230000001580 bacterial effect Effects 0.000 claims abstract description 164
- 235000015097 nutrients Nutrition 0.000 claims abstract description 32
- 238000005507 spraying Methods 0.000 claims abstract description 26
- 239000003513 alkali Substances 0.000 claims abstract description 24
- 238000004064 recycling Methods 0.000 claims abstract description 22
- 239000000428 dust Substances 0.000 claims abstract description 16
- 241000233866 Fungi Species 0.000 claims abstract description 5
- 238000000926 separation method Methods 0.000 claims description 30
- 241000894006 Bacteria Species 0.000 claims description 29
- 238000001035 drying Methods 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 7
- 230000033116 oxidation-reduction process Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 5
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000004571 lime Substances 0.000 abstract description 5
- 239000002351 wastewater Substances 0.000 abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 16
- 238000000034 method Methods 0.000 description 16
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 239000010440 gypsum Substances 0.000 description 7
- 229910052602 gypsum Inorganic materials 0.000 description 7
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 4
- 239000004202 carbamide Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethyl mercaptane Natural products CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 description 2
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 2
- 235000019796 monopotassium phosphate Nutrition 0.000 description 2
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 2
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 241000222120 Candida <Saccharomycetales> Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000305071 Enterobacterales Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 241000607598 Vibrio Species 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Treating Waste Gases (AREA)
Abstract
The utility model relates to the technical field of flue gas desulfurization, in particular to a flue gas desulfurization and sulfur recovery system, which comprises: a dust remover; the induced draft fan is connected with the flue gas outlet of the dust remover; a primary flue gas desulfurization tower connected with a flue gas outlet of the induced draft fan; a secondary flue gas desulfurization tower connected with the flue gas outlet of the primary flue gas desulfurization tower; the primary flue gas desulfurization tower comprises: the fungus liquid pool is arranged at the bottom of the primary flue gas desulfurization tower; the bacterial liquid pool is provided with a bacterial liquid inlet, a nutrient liquid inlet, an alkali liquid inlet, a bacterial liquid recycling outlet and a bacterial liquid outlet; the bacterial liquid spraying device is arranged at the upper part of the primary flue gas desulfurization tower; the inlet of the bacterial liquid spraying device is connected with the bacterial liquid recycling outlet of the bacterial liquid pool; and the demister is arranged at the upper part of the bacterial liquid spraying device. The utility model solves the problems of high lime consumption and high energy consumption in the system operation and high treatment difficulty of the generated desulfurization wastewater in the prior art.
Description
Technical Field
The utility model relates to the technical field of flue gas desulfurization, in particular to a flue gas desulfurization and sulfur recovery system.
Background
The desulfurization of the flue gas of the coal-fired power plant generally adopts a limestone-gypsum wet desulfurization process, the system has large lime consumption and high energy consumption during operation, and the produced desulfurization wastewater has large treatment difficulty. In addition, in the middle and western regions, gypsum byproducts generated by the limestone-gypsum wet desulfurization process are difficult to sell and difficult to treat.
Disclosure of utility model
In view of the above, the technical problem to be solved by the utility model is to provide a flue gas desulfurization and sulfur recovery system, which solves the problems of high lime consumption, high energy consumption and high desulfurization wastewater treatment difficulty in the prior art.
The utility model provides a flue gas desulfurization and sulfur recovery system, which comprises:
a dust remover;
the induced draft fan is connected with the flue gas outlet of the dust remover;
A primary flue gas desulfurization tower connected with a flue gas outlet of the induced draft fan;
a secondary flue gas desulfurization tower connected with the flue gas outlet of the primary flue gas desulfurization tower;
The primary flue gas desulfurization tower comprises:
The fungus liquid pool is arranged at the bottom of the primary flue gas desulfurization tower; the bacterial liquid pool is provided with a bacterial liquid inlet, a nutrient liquid inlet, an alkali liquid inlet, a bacterial liquid recycling outlet and a bacterial liquid outlet;
The bacterial liquid spraying device is arranged at the upper part of the primary flue gas desulfurization tower; the inlet of the bacterial liquid spraying device is connected with the bacterial liquid recycling outlet of the bacterial liquid pool;
And the demister is arranged at the upper part of the bacterial liquid spraying device.
Preferably, the method further comprises: a first centrifugal separator connected to the liquid outlet of the liquid pool;
Further comprises: a discharge pump;
The first centrifugal separation device is connected with a bacterial liquid outlet of the bacterial liquid pond through the discharge pump.
Preferably, the method further comprises: a second centrifugal separation device;
a liquid outlet pipeline of the first centrifugal separation device is provided with a bifurcation pipeline which is marked as a first pipeline and a second pipeline;
The first pipeline is provided with a first valve, and the second pipeline is provided with a second valve; the first valve is connected with a recycling bacterial liquid inlet of the bacterial liquid box; the second valve is connected with the second centrifugal separation device; and the liquid outlet of the second centrifugal separation device is connected with the recycling bacterial liquid inlet of the bacterial liquid tank.
Preferably, the method further comprises: a bacteria liquid tank and a bacteria liquid conveying pump;
The bacterial liquid tank is connected with a bacterial liquid inlet of the bacterial liquid pond through the bacterial liquid conveying pump.
Preferably, the method further comprises: a bacterial liquid circulating pump;
The inlet of the bacterial liquid circulating pump is connected with the bacterial liquid recycling outlet of the bacterial liquid pool, and the outlet of the bacterial liquid circulating pump is connected with the bacterial liquid spraying device.
Preferably, the method further comprises: an online pH meter and an online ORP meter;
The online pH meter is used for monitoring the pH value of the bacterial liquid in the bacterial liquid pool;
The online ORP meter is used for monitoring the oxidation-reduction potential of the bacterial liquid in the bacterial liquid pool.
Preferably, the method further comprises: an alkali liquor conveying pump and an alkali liquor box;
The alkali liquor box is connected with an alkali liquor inlet of the bacterial liquid pond through the alkali liquor conveying pump.
Preferably, the method further comprises: a blower;
and the device is used for blowing air into the bacterial liquid pool.
Preferably, the method further comprises: a nutrient solution tank and a nutrient solution delivery pump;
The nutrient solution tank is connected with the nutrient solution inlet of the bacterial liquid pond through the nutrient solution delivery pump.
Preferably, the method further comprises: elemental sulfur drying device;
The elemental sulfur drying device is connected with the solid outlet of the first centrifugal separation device; the solid outlet of the first centrifugal separation device discharges elemental sulfur.
The utility model provides a flue gas desulfurization and sulfur recovery system, which comprises: a dust remover; the induced draft fan is connected with the flue gas outlet of the dust remover; a primary flue gas desulfurization tower connected with a flue gas outlet of the induced draft fan; a secondary flue gas desulfurization tower connected with the flue gas outlet of the primary flue gas desulfurization tower; the primary flue gas desulfurization tower comprises: the fungus liquid pool is arranged at the bottom of the primary flue gas desulfurization tower; the bacterial liquid pool is provided with a bacterial liquid inlet, a nutrient liquid inlet, an alkali liquid inlet, a bacterial liquid recycling outlet and a bacterial liquid outlet; the bacterial liquid spraying device is arranged at the upper part of the primary flue gas desulfurization tower; the inlet of the bacterial liquid spraying device is connected with the bacterial liquid recycling outlet of the bacterial liquid pool; and the demister is arranged at the upper part of the bacterial liquid spraying device. The utility model provides a process system which is reasonable in design, low in operation cost and capable of recovering high-value elemental sulfur from flue gas, and solves the problems of large lime sales, high energy consumption and high treatment difficulty of desulfurization wastewater generated in the system operation in the prior art.
Drawings
FIG. 1 is a diagram of a flue gas desulfurization and sulfur recovery system according to one embodiment of the present application.
Detailed Description
The technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model provides a flue gas desulfurization and sulfur recovery system, which comprises:
a dust remover;
the induced draft fan is connected with the flue gas outlet of the dust remover;
A primary flue gas desulfurization tower connected with a flue gas outlet of the induced draft fan;
a secondary flue gas desulfurization tower connected with the flue gas outlet of the primary flue gas desulfurization tower;
The primary flue gas desulfurization tower comprises:
The fungus liquid pool is arranged at the bottom of the primary flue gas desulfurization tower; the bacterial liquid pool is provided with a bacterial liquid inlet, a nutrient liquid inlet, an alkali liquid inlet, a bacterial liquid recycling outlet and a bacterial liquid outlet;
The bacterial liquid spraying device is arranged at the upper part of the primary flue gas desulfurization tower; the inlet of the bacterial liquid spraying device is connected with the bacterial liquid recycling outlet of the bacterial liquid pool;
And the demister is arranged at the upper part of the bacterial liquid spraying device.
FIG. 1 is a diagram of a flue gas desulfurization and sulfur recovery system according to one embodiment of the present application. Wherein 1 is a dust remover, 2 is an induced draft fan, 3 is a flue gas inlet flue, 4 is a flue gas outlet flue, 5 is a secondary flue gas desulfurization tower, 6 is a chimney, 7 is a primary flue gas desulfurization tower, 8 is a demister, 9 is a bacterial liquid circulating pump, 10 is a bacterial liquid spraying device, 11 is a bacterial liquid pond, 12 is an online pH meter, 13 is an online ORP meter, 14 is an alkali liquid conveying pump, 15 is an alkali liquid tank, 16 is a blower, 17 is a bacterial liquid tank, 18 is a bacterial liquid conveying pump, 19 is a nutrient liquid tank, 20 is a nutrient liquid conveying pump, 21 is a discharge pump, 22 is a first centrifugal separation device, 23 is a bacterial liquid recovery pipeline, 24 is a elemental sulfur drying device, 25 is a first valve, 26 is a second valve, 27 is a second centrifugal separation device, and 28 is a water recovery pipeline.
The flue gas desulfurization and sulfur recovery system provided by the utility model comprises a dust remover 1. In certain embodiments of the utility model, the dust collector is an electric dust collector, a bag-type dust collector, or an electric bag collector.
The flue gas desulfurization and sulfur recovery system provided by the utility model further comprises an induced draft fan 2 connected with a flue gas outlet of the dust remover. The induced draft fan can be generally sold in the market.
The flue gas desulfurization and sulfur recovery system provided by the utility model further comprises a primary flue gas desulfurization tower 7. And a flue gas inlet of the primary flue gas desulfurization tower is connected with a flue gas outlet of the induced draft fan. And a flue between the flue gas inlet of the primary flue gas desulfurization tower and the flue gas outlet of the induced draft fan is recorded as a flue gas inlet flue 3.
The primary flue gas desulfurization tower 7 includes:
The bacterial liquid pool 11 is arranged at the bottom of the primary flue gas desulfurization tower 7; the bacterial liquid pool is provided with a bacterial liquid inlet, a nutrient liquid inlet, an alkali liquid inlet, a bacterial liquid recycling outlet and a bacterial liquid outlet;
The bacterial liquid spraying device 10 is arranged at the upper part of the primary flue gas desulfurization tower; the inlet of the bacterial liquid spraying device is connected with the bacterial liquid recycling outlet of the bacterial liquid pool;
And a demister 8 arranged at the upper part of the bacterial liquid spraying device.
The primary flue gas desulfurization tower 7 is a sulfate reducing bacteria flue gas desulfurization tower.
In some embodiments of the application, the flue gas inlet of the primary flue gas desulfurization tower is arranged on the side wall between the bacterial liquid pool and the bacterial liquid spraying device of the primary flue gas desulfurization tower.
In certain embodiments of the application, the flue gas desulfurization and sulfur recovery system further comprises a bacteria liquid tank 17. The bacterial liquid box is connected with a bacterial liquid inlet of the bacterial liquid pool. In some embodiments, a bacteria liquid transfer pump 18 is disposed between the bacteria liquid tank and the bacteria liquid pond for transferring bacteria liquid in the bacteria liquid tank to the bacteria liquid pond. The structure and the type of the bacteria liquid tank are not particularly limited, and the bacteria liquid can be stored. In certain embodiments of the application, the bacterial liquid in the bacterial liquid tank is sulfate reducing bacteria. The sulfate reducing bacteria are desulfurization monad, desulfurization enterobacteria, desulfurization vibrio or desulfurization candida, and are all commonly sold in the market. The bacterial liquid transfer pump may be a solution pump which is generally commercially available.
In certain embodiments of the application, the flue gas desulfurization and sulfur recovery system further comprises a bacteria liquid circulation pump 9. The inlet of the bacterial liquid circulating pump is connected with the bacterial liquid recycling outlet of the bacterial liquid pool, and the outlet of the bacterial liquid circulating pump is connected with the bacterial liquid spraying device. The bacterial liquid circulating pump is used for conveying bacterial liquid in the bacterial liquid pool to the bacterial liquid spraying device. The bacterial liquid circulation pump may be a general commercially available solution pump.
In some embodiments of the present application, the bacterial liquid spraying device is a spray header, and may be generally commercially available.
The bacterial liquid circulation pump 9 extracts bacterial liquid from the bacterial liquid pool 11 and sprays the bacterial liquid into the sulfate reducing bacteria flue gas desulfurization tower 7 through the bacterial liquid spraying device 10, the bacterial liquid is in direct contact with flue gas in the process, SO 2、SO3 and the like in the flue gas are absorbed by the bacterial liquid to form sulfate and sulfite, and the sulfate and the sulfite are reduced into elemental sulfur under the action of sulfate reducing bacteria.
In certain embodiments of the application, the mist eliminator is generally commercially available.
In certain embodiments of the present application, the flue gas desulfurization and sulfur recovery system further comprises an online pH meter 12 and an online ORP meter 13.
In certain embodiments of the application, the flue gas desulfurization and sulfur recovery system further comprises an lye transfer pump 14 and a lye tank 15. The alkali liquor box is connected with an alkali liquor inlet of the bacterial liquid pond through an alkali liquor conveying pump. The lye delivery pump may be a solution pump commonly commercially available. The application is not particularly limited in the structure and the type of the lye box, and can store lye.
In certain embodiments of the application, the flue gas desulfurization and sulfur recovery system further comprises a blower 16; for bubbling air into the bacterial cell.
In certain embodiments of the application, the flue gas desulfurization and sulfur recovery system further comprises a nutrient solution tank 19 and a nutrient solution delivery pump 20. The nutrient solution tank is connected with a nutrient solution inlet of the bacterial liquid pool through a nutrient solution delivery pump. The nutrient solution delivery pump may be a solution pump commonly commercially available. The application is not particularly limited in the structure and kind of the nutrient solution tank, and can store nutrient solution. In some embodiments of the present application, the nutrient solution includes at least one of methanol, waste alcohol, urea and liquid ammonia, and has the advantages of low cost, easy availability, etc., and the overall operation cost of the system is low. In certain embodiments, the nutrient solution comprises methanol, urea, potassium dihydrogen phosphate, and mercaptoethanol, wherein the mass content of methanol is 70%, the mass content of urea is 15%, the mass content of potassium dihydrogen phosphate is 5%, and the mass content of mercaptoethanol is 10%.
In the application, the pH value of the bacterial liquid is monitored by the online pH meter 12, the alkali liquid conveying pump 14 is started according to the pH value of the bacterial liquid, the alkali liquid is added into the bacterial liquid pool 11 to adjust the pH value of the bacterial liquid, the oxidation-reduction potential of the bacterial liquid is monitored by the online ORP meter 13, and the air blower 16 is started to blow air into the bacterial liquid pool 11 when necessary, so that the oxidation-reduction potential is maintained in a reasonable range. The bacterial liquid is fed from the bacterial liquid tank 17 to the bacterial liquid tank 11 through the bacterial liquid delivery pump 18, and the nutrient liquid is fed from the nutrient liquid tank 19 to the bacterial liquid tank 11 through the nutrient liquid delivery pump 20. In certain embodiments of the application, the nutrient solution includes at least one of methanol, alcohol, and urea, primarily to provide a carbon source and a nitrogen source for the sulfate reducing agent.
In the application, the process system is provided with the online pH meter and the online ORP meter, and can automatically adjust alkali addition and air blowing according to the pH value and oxidation-reduction potential of the bacterial liquid, so as to ensure that the sulfate reducing bacteria flue gas desulfurization system is in optimal operation parameters.
In certain embodiments of the present application, the flue gas desulfurization and sulfur recovery system further comprises a discharge pump 21 and a first centrifugal separation device 22. The first centrifugal separation device is connected with a bacterial liquid outlet of the bacterial liquid pond through a discharge pump.
In certain embodiments of the application, a bifurcated conduit, denoted first and second conduit, is provided on the liquid outlet conduit of the first centrifugal separation device. The first pipeline is provided with a first valve 25, and the second pipeline is provided with a second valve 26. The first valve is connected with a recycling bacterial liquid inlet of the bacterial liquid box. The pipeline between the first valve and the bacteria liquid tank is marked as a bacteria liquid recovery pipeline 23. Said second valve is connected to a second centrifugal separation device 27; and the liquid outlet of the second centrifugal separation device is connected with the recycling bacterial liquid inlet of the bacterial liquid tank. The conduit between the liquid outlet of the second centrifugal separation device and the bacteria liquid tank is denoted as water recovery conduit 28. And the excessive sulfate reducing bacteria discharged from the solid outlet of the second centrifugal separation device can be mixed with coal for combustion, so that the power generation coal consumption is reduced.
In certain embodiments of the present application, the flue gas desulfurization and sulfur recovery system further comprises an elemental sulfur drying device 24. The elemental sulfur drying device is connected with the solid outlet of the first centrifugal separation device. The solid outlet of the first centrifugal separation device discharges elemental sulfur.
According to the application, the discharge pump 21 is arranged at the bottom of the sulfate reducing bacteria flue gas desulfurization tower 7, bacterial liquid is periodically discharged and enters the first centrifugal separation device 22, the rotating speed of the first centrifugal separation device 22 can be adjusted, elemental sulfur can be separated from the bacterial liquid, the separated bacterial liquid enters the bacterial liquid tank 17 through the bacterial liquid recovery pipeline 23, the separated elemental sulfur enters the elemental sulfur drying device 24 for drying treatment and then is transported and sold, when the bacterial liquid is too much, the first valve 25 is closed, the second valve 26 is opened, the bacterial liquid from the first centrifugal separation device 22 enters the second centrifugal separation device 27 for further centrifugal treatment, the sulfate reducing agent is separated, and then the bacterial liquid is mixed with coal, and water after bacterial liquid centrifugation enters the bacterial liquid tank 17 for recycling through the water recovery pipeline 28.
In certain embodiments of the application, the first and second centrifugal separation devices are both spin-dryers.
In some embodiments of the application, the elemental sulfur drying device is a numerical control electric oven, and the temperature is controlled to be 80-120 ℃.
The recovery rate of the elemental sulfur discharged from the elemental sulfur drying device 24 is not less than 95% and the purity is not less than 80%.
The flue gas desulfurization and sulfur recovery system provided by the application further comprises a secondary flue gas desulfurization tower 5 connected with the flue gas outlet of the primary flue gas desulfurization tower. The flue between the primary flue gas desulfurization tower and the secondary flue gas desulfurization tower is recorded as a flue gas outlet flue 4.
In certain embodiments of the application, the secondary flue gas desulfurization tower is a spray tower.
In certain embodiments of the application, the concentration of sulfur dioxide in the flue gas exiting the secondary flue gas desulfurization tower is <35mg/Nm 3.
In certain embodiments of the application, the flue gas desulfurization and sulfur recovery system further comprises a stack 5. And a flue gas inlet of the chimney is connected with a flue gas outlet of the secondary flue gas desulfurization tower.
According to the application, a sulfate reducing bacteria flue gas desulfurization and limestone-gypsum wet flue gas desulfurization synergistic process is adopted, SO that on the basis of ensuring that SO 2、SO3 and the like in flue gas reach the ultralow emission requirement, high-value elemental sulfur is recovered, the limestone consumption and the energy consumption cost of a limestone-gypsum wet flue gas desulfurization system are reduced, and in addition, the desulfurization wastewater quantity generated by the operation of the limestone-gypsum wet flue gas desulfurization system can be reduced, SO that the method has remarkable economic benefit and environmental protection benefit.
In order to further illustrate the present utility model, the following examples are provided to illustrate a flue gas desulfurization and sulfur recovery system in detail, but are not to be construed as limiting the scope of the utility model.
Example 1
The parameters of the flue gas generated by a certain thermal power generating unit are as follows: the flue gas amount is 1000000Nm 3/h、SO2 and the content is 3500mg/Nm 3, the flue gas desulfurization and sulfur recovery system shown in figure 1 is adopted to carry out the desulfurization and sulfur recovery of the flue gas, the sulfate reducing bacteria are desulfurization monad, and the removal rate of SO 2 in the flue gas by the sulfate reducing bacteria flue gas desulfurization system reaches more than 20%. And the residence time of the flue gas in the sulfate reducing bacteria flue gas desulfurization system can be adjusted according to actual needs, and the yield of elemental sulfur can be adjusted. The system is operated to save the lime consumption of the limestone-gypsum wet flue gas desulfurization system by more than 20%, reduce the desulfurization wastewater yield by more than 20%, and the recovery rate of elemental sulfur is not lower than 96% and the purity is not lower than 85%.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A flue gas desulfurization and sulfur recovery system comprising:
a dust remover;
the induced draft fan is connected with the flue gas outlet of the dust remover;
A primary flue gas desulfurization tower connected with a flue gas outlet of the induced draft fan;
a secondary flue gas desulfurization tower connected with the flue gas outlet of the primary flue gas desulfurization tower;
The primary flue gas desulfurization tower comprises:
The fungus liquid pool is arranged at the bottom of the primary flue gas desulfurization tower; the bacterial liquid pool is provided with a bacterial liquid inlet, a nutrient liquid inlet, an alkali liquid inlet, a bacterial liquid recycling outlet and a bacterial liquid outlet;
The bacterial liquid spraying device is arranged at the upper part of the primary flue gas desulfurization tower; the inlet of the bacterial liquid spraying device is connected with the bacterial liquid recycling outlet of the bacterial liquid pool;
And the demister is arranged at the upper part of the bacterial liquid spraying device.
2. The flue gas desulfurization and sulfur recovery system of claim 1, further comprising: a first centrifugal separator connected to the liquid outlet of the liquid pool;
Further comprises: a discharge pump;
The first centrifugal separation device is connected with a bacterial liquid outlet of the bacterial liquid pond through the discharge pump.
3. The flue gas desulfurization and sulfur recovery system of claim 2, further comprising: a second centrifugal separation device;
a liquid outlet pipeline of the first centrifugal separation device is provided with a bifurcation pipeline which is marked as a first pipeline and a second pipeline;
The first pipeline is provided with a first valve, and the second pipeline is provided with a second valve; the first valve is connected with a recycling bacterial liquid inlet of the bacterial liquid box; the second valve is connected with the second centrifugal separation device; and the liquid outlet of the second centrifugal separation device is connected with the recycling bacterial liquid inlet of the bacterial liquid tank.
4. The flue gas desulfurization and sulfur recovery system of claim 1, further comprising: a bacteria liquid tank and a bacteria liquid conveying pump;
The bacterial liquid tank is connected with a bacterial liquid inlet of the bacterial liquid pond through the bacterial liquid conveying pump.
5. The flue gas desulfurization and sulfur recovery system of claim 1, further comprising: a bacterial liquid circulating pump;
The inlet of the bacterial liquid circulating pump is connected with the bacterial liquid recycling outlet of the bacterial liquid pool, and the outlet of the bacterial liquid circulating pump is connected with the bacterial liquid spraying device.
6. The flue gas desulfurization and sulfur recovery system of claim 1, further comprising: an online pH meter and an online ORP meter;
The online pH meter is used for monitoring the pH value of the bacterial liquid in the bacterial liquid pool;
The online ORP meter is used for monitoring the oxidation-reduction potential of the bacterial liquid in the bacterial liquid pool.
7. The flue gas desulfurization and sulfur recovery system of claim 1, further comprising: an alkali liquor conveying pump and an alkali liquor box;
The alkali liquor box is connected with an alkali liquor inlet of the bacterial liquid pond through the alkali liquor conveying pump.
8. The flue gas desulfurization and sulfur recovery system of claim 1, further comprising: a blower;
and the device is used for blowing air into the bacterial liquid pool.
9. The flue gas desulfurization and sulfur recovery system of claim 1, further comprising: a nutrient solution tank and a nutrient solution delivery pump;
The nutrient solution tank is connected with the nutrient solution inlet of the bacterial liquid pond through the nutrient solution delivery pump.
10. The flue gas desulfurization and sulfur recovery system of claim 1, further comprising: elemental sulfur drying device;
The elemental sulfur drying device is connected with the solid outlet of the first centrifugal separation device; the solid outlet of the first centrifugal separation device discharges elemental sulfur.
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