CN219933993U - Biogas power generation system of sewage station - Google Patents
Biogas power generation system of sewage station Download PDFInfo
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- CN219933993U CN219933993U CN202320516574.9U CN202320516574U CN219933993U CN 219933993 U CN219933993 U CN 219933993U CN 202320516574 U CN202320516574 U CN 202320516574U CN 219933993 U CN219933993 U CN 219933993U
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- 238000010248 power generation Methods 0.000 title claims abstract description 51
- 239000010865 sewage Substances 0.000 title claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 115
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 110
- 230000023556 desulfurization Effects 0.000 claims abstract description 110
- 230000008929 regeneration Effects 0.000 claims abstract description 60
- 238000011069 regeneration method Methods 0.000 claims abstract description 60
- 238000000746 purification Methods 0.000 claims abstract description 42
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 claims abstract description 29
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 26
- 239000011593 sulfur Substances 0.000 claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
- 239000002351 wastewater Substances 0.000 claims abstract description 20
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 238000004064 recycling Methods 0.000 claims abstract description 10
- 238000012423 maintenance Methods 0.000 claims abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 46
- 239000007789 gas Substances 0.000 claims description 36
- 230000003009 desulfurizing effect Effects 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 14
- 239000006260 foam Substances 0.000 claims description 13
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 13
- 238000004146 energy storage Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 13
- 238000000034 method Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 150000002500 ions Chemical class 0.000 description 6
- 230000001172 regenerating effect Effects 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002468 redox effect Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Treatment Of Sludge (AREA)
Abstract
The utility model discloses a sewage station biogas power generation system, which comprises: the device comprises an anaerobic gas production unit, a biogas desulfurization unit, a desulfurization liquid regeneration unit, a purification treatment unit, a torch emergency unit and a combustion power generation unit; the anaerobic gas production unit, the biogas desulfurization unit, the purification treatment unit and the combustion power generation unit are sequentially connected, and biogas generated by the anaerobic gas production unit is sequentially desulfurized and purified and then is input into the combustion power generation unit for power generation; the biogas desulfurization unit is also connected with a desulfurization liquid regeneration unit, and the sulfur-containing wastewater generated by the biogas desulfurization unit is input into the desulfurization liquid regeneration unit for recycling; the anaerobic gas production unit, the biogas desulfurization unit and the purification treatment unit are all connected with a torch emergency unit, and the torch emergency unit is used for system fault maintenance and emergency of emergencies. The utility model has the advantages of simple principle, obvious purifying effect, low running cost and the like, and removes the moisture and H in the anaerobic biogas 2 S and particulate impurities, thereby improving the effect and emergency disposal capability of biogas power generation.
Description
Technical Field
The utility model belongs to the technical field of biogas treatment, and particularly relates to a biogas power generation system of a sewage station.
Background
When the high-concentration organic wastewater is treated by adopting an anaerobic process, a large amount of biogas can be generated by anaerobic fermentation of organic matters, and the high-concentration organic wastewater can be used as an efficient clean energy source. Compared with industrial biogas or natural gas, the biogas generated by the anaerobic system of the sewage station has relatively complex components, and the main components comprise CH 4 And CO 2 And also contains H 2 S and granular impurities, which carry a large amount of moisture and a small amount of hydrogen, oxygen, nitrogen and other gases, generally cannot be directly used for biogas power generation, and have the following common problems:
(1) The biogas in the sewage station contains a large amount of water, which is easy to cause low ignition success rate of the burner or can not normally ignite, and meanwhile, the low-lying elbow of the biogas conveying pipeline is easy to form a water seal, so that the conveying is blocked;
(2) H in marsh gas 2 S generates SO after combustion 2 The metal surface of the rear-end biogas combustion power generation equipment is corroded, the service life of the equipment is influenced, and the atmospheric pollution is caused;
(3) Particulate impurities in the biogas can cause abrasion to a conveying pipeline and a burner, so that the service life of equipment is influenced, and potential safety hazards are caused;
(4) H in marsh gas 2 S content is too high, sulfur paste is easy to form in an environment containing oxygen and moisture and is adhered to the pipe wall or the surface of equipment of the biogas conveying pipeline, so that the stable operation of the biogas conveying pipeline or the equipment is affected.
Thus, sewage station biogas needs to be desulfurized and pretreated to reduce the moisture and H therein 2 S and granular impurities, and can be used for effectively utilizing energy. At present, common biogas desulfurization methods comprise dry desulfurization, wet desulfurization, biological desulfurization and the like, and the conventional biogas desulfurization process has the problems of high operation cost, complex operation, poor load resistance and the like. Meanwhile, the existing biogas treatment system mainly considers desulfurization, does not comprehensively consider other components affecting the combustion utilization of biogas, and has room for improving and optimizing the operation safety of the system taking biogas as inflammable and explosive gas.
Disclosure of Invention
The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing the sewage station biogas power generation system which has the advantages of simple principle, remarkable purifying effect and low operation cost.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a sewage plant biogas power generation system comprising: the device comprises an anaerobic gas production unit, a biogas desulfurization unit, a desulfurization liquid regeneration unit, a purification treatment unit, a torch emergency unit and a combustion power generation unit; the anaerobic gas production unit, the biogas desulfurization unit, the purification treatment unit and the combustion power generation unit are sequentially connected, biogas generated by the anaerobic gas production unit is input into the biogas desulfurization unit for desulfurization treatment, desulfurized biogas is input into the purification treatment unit for dehydration and impurity removal, and purified biogas is input into the combustion power generation unit for power generation; the biogas desulfurization unit is also connected with a desulfurization liquid regeneration unit, and the sulfur-containing wastewater generated in the biogas desulfurization unit is input into the desulfurization liquid regeneration unit for recycling; the anaerobic gas production unit, the biogas desulfurization unit and the purification treatment unit are all connected with a torch emergency unit, and the torch emergency unit is used for system fault maintenance and emergency of emergencies.
As a further improvement of the utility model, the biogas desulfurization unit comprises a first gas-liquid separator, a first-stage desulfurization tower, a second-stage desulfurization tower and a second gas-liquid separator which are sequentially connected, wherein the input end of the first gas-liquid separator is connected with an anaerobic gas production unit, and the output end of the second gas-liquid separator is respectively connected with a purification treatment unit and a torch emergency unit; the first-stage desulfurizing tower and the second-stage desulfurizing tower are connected with a desulfurizing liquid regeneration unit.
As a further improvement of the present utility model, the desulfurization liquid regeneration unit includes: the liquid outlets at the bottoms of the primary desulfurization tower and the secondary desulfurization tower are connected with the rich liquid tank, and the rich liquid tank is used for collecting sulfur-containing wastewater; the rich liquid tank is connected with the regeneration tower, and the sulfur-containing wastewater is oxidized and regenerated in the regeneration tower; the regeneration tower is connected with a lean solution tank, the lean solution regenerated in the regeneration tower is conveyed into the lean solution tank, the lean solution tank is respectively connected with liquid outlets at the tops of the first-stage desulfurization tower and the second-stage desulfurization tower, and the lean solution in the lean solution tank is conveyed into the desulfurization tower to spray and circularly absorb hydrogen sulfide in methane.
As a further improvement of the utility model, the desulfurization liquid regeneration unit also comprises a sulfur foam tank, a filter press and a liquid storage tank which are sequentially connected, the regeneration tower is connected with the sulfur foam tank, elemental sulfur precipitated in the regeneration tower is suspended at the top of the regeneration tower and overflows into the sulfur foam tank, the sulfur foam tank is conveyed to the filter press to filter and separate out elemental sulfur, and filtered clear liquid flows into the liquid storage tank and is conveyed to the rich liquid tank for recycling.
As a further improvement of the utility model, the purification treatment unit comprises a coarse filter, a water-gas heat exchanger, a third gas-liquid separator, a Roots blower, an air-cooled radiator and a precise filter which are sequentially connected, wherein the input end of the coarse filter is connected with the output end of the second gas-liquid separator, and the output end of the precise filter is respectively connected with the torch emergency unit and the combustion power generation unit.
As a further improvement of the utility model, the purification treatment unit further comprises a water chilling unit and an energy storage water tank, wherein the water chilling unit and the energy storage water tank are connected with the water-air heat exchanger.
As a further improvement of the utility model, the purification treatment unit further comprises a safety valve, wherein the input end of the safety valve is connected with the Roots blower, and the output end of the safety valve is connected with the air-cooled radiator.
As a further development of the utility model, the purification treatment unit further comprises a first flame arrester, the input end of which is connected to the coarse filter, and the output end of which is connected to the moisture heat exchanger.
As a further improvement of the utility model, the device also comprises a second flame arrester and a third flame arrester, wherein the input end of the second flame arrester is connected with the precision filter, and the output end of the second flame arrester is connected with the torch emergency unit; the input end of the third flame arrester is connected with the precision filter, and the output end of the third flame arrester is connected with the combustion power generation unit.
As a further improvement of the utility model, the system also comprises a condensate well, wherein the biogas desulfurization unit and the purification treatment unit are connected with the condensate well, the condensate well is connected with a sewage pipe network, and the condensate well is used for collecting wastewater discharged from the biogas desulfurization unit and the purification treatment unit.
Compared with the prior art, the utility model has the advantages that:
according to the biogas power generation system of the sewage station, provided by the utility model, the biogas produced by the anaerobic biogas production unit is desulfurized, purified and decontaminated by arranging the biogas desulfurization unit and the purification treatment unit, so that the moisture and H in the anaerobic biogas production are effectively removed 2 S and particulate impurities, and H 2 The S removal rate can reach more than 98%, and the purified biogas can be directly combusted to generate electricity, so that the recycling of carbon in the organic wastewater is realized; further, by arranging the torch emergency unit and connecting with the anaerobic gas production unit, the biogas desulfurization unit and the purification treatment unit respectively, when the biogas desulfurization unit, the purification treatment unit or the combustion generation unit fails and cannot normally operate, biogas can be flexibly switched to the torch emergency unit for complete combustion according to actual failure conditions, and the emergency treatment capacity of the biogas power generation system is improved.
Drawings
FIG. 1 is a schematic diagram of the sewage station biogas power generation system.
FIG. 2 is a schematic diagram of the structural principle of the biogas desulfurization unit and the desulfurization liquid regeneration unit in the present utility model.
Legend description: 1. an anaerobic gas production unit; 2. a biogas desulfurization unit; 21. a first-stage desulfurizing tower; 22. a secondary desulfurizing tower, a 3, a desulfurizing liquid regeneration unit; 311. a rich liquid tank; 312. a rich liquid pump; 321. a regeneration tower; 322. a regenerating fan; 323. an air-cooled radiator; 331. a lean liquid tank; 332. a lean liquid pump; 341. a sulfur foam tank; 342. a transfer pump; 343. a filter press; 344. a liquid storage tank; 345. a reflux pump; 4. a preprocessing unit; 41. a coarse filter; 42. a water-gas heat exchanger; 43. a water chiller; 44. an energy storage water tank; 45. roots blower; 46. a safety valve; 47. an air-cooled radiator; 48. a precision filter; 5. a torch emergency unit; 51. a torch; 6. a combustion power generation unit; 71. a first gas-liquid separator; 72. a second gas-liquid separator; 73. a third gas-liquid separator; 8. a condensate well; 91. a first flame arrestor; 92. a second flame arrestor; 93. and a third flame arrestor.
Detailed Description
The utility model is further described below in connection with the drawings and the specific preferred embodiments, but the scope of protection of the utility model is not limited thereby.
Example 1
As shown in fig. 1 and 2, the sewage station biogas power generation system of the present utility model comprises: the system comprises an anaerobic gas production unit 1, a biogas desulfurization unit 2, a desulfurization liquid regeneration unit 3, a purification treatment unit 4, a torch emergency unit 5 and a combustion power generation unit 6. The anaerobic gas production unit 1, the biogas desulfurization unit 2, the purification treatment unit 4 and the combustion power generation unit 6 are sequentially connected, biogas generated by the anaerobic gas production unit 1 is input into the biogas desulfurization unit 2 for desulfurization treatment, the desulfurized biogas is input into the purification treatment unit 4 for impurity removal, the purified biogas is input into the combustion power generation unit 6, the biogas is combusted to drive a generator connected with a biogas internal combustion engine to generate electric power, the conversion of bioenergy, heat energy and electric energy is realized, and heat in cooling water and waste gas discharged by a biogas generator set can be subjected to heat recovery. The biogas desulfurization unit 2 is also connected with a desulfurization liquid regeneration unit 3, and the sulfur-containing wastewater generated in the biogas desulfurization unit 2 is input into the desulfurization liquid regeneration unit 3 for recycling; the anaerobic gas production unit 1, the biogas desulfurization unit 2 and the purification treatment unit 4 are all connected with the torch emergency unit 5, and the torch emergency unit 5 is used for system emergency. Because the concentration of hydrogen sulfide in the biogas generated by anaerobic sewage stations is high, the components are complex, the corrosiveness is strong, and a certain failure rate of the biogas power generation system can be realized. The flare emergency unit 5 is used for carrying out methane emergency treatment during sudden faults or scheduled overhauling of each unit of the methane power generation system, and is capable of ensuring that the collected gas is completely combusted after entering the flare 51, and is not started in normal operation, and is only required to be tested periodically.
In this embodiment, the anaerobic gas generating unit 1 is a main reaction place for removing organic pollutants from high-concentration organic wastewater in a sewage station, and is collectively called an anaerobic reactor, and organic matters are decomposed by microorganisms to generate a large amount of biogas in an anaerobic state, and enter a subsequent biogas desulfurization unit 2 through a biogas collecting pipe at the top of the reactor.
In the embodiment, the biogas produced by the anaerobic biogas production unit 1 is desulfurized, purified and decontaminated by arranging the biogas desulfurization unit 2 and the purification treatment unit 4, so that the moisture and H in the anaerobic biogas production are effectively removed 2 S and particulate impurities, and H 2 The S removal rate can reach more than 98%, and the purified biogas can be directly combusted to generate electricity, so that the recycling of carbon in the organic wastewater is realized. Further, through setting up the emergent unit 5 of torch to link to each other with anaerobic gas production unit 1, marsh gas desulfurization unit 2 and purification treatment unit 4 respectively, when marsh gas desulfurization unit 2, purification treatment unit 4 or burning power generation unit 6 break down unable normal operating, can be according to actual fault condition, switch marsh gas to the emergent unit 5 of torch in a flexible way and carry out complete combustion, improved marsh gas power generation system's emergent handling capacity.
As shown in fig. 1, in the present embodiment, the biogas desulfurization unit 2 includes a first gas-liquid separator 71, a primary desulfurization tower 21, a secondary desulfurization tower 22, and a second gas-liquid separator 72 that are connected in this order. The input end of the first gas-liquid separator 71 is connected with the anaerobic gas generating unit 1, and the output end of the second gas-liquid separator 72 is respectively connected with the purifying treatment unit 4 and the torch emergency unit 5; the first-stage desulfurization tower 21 and the second-stage desulfurization tower 22 are both connected to the desulfurization liquid regeneration unit 3.
In the embodiment, the biogas desulfurization unit 2 is connected with the anaerobic gas production unit 1 and comprises two wet desulfurization towers which are connected in series and gas-liquid separators which are respectively arranged in front of and behind the desulfurization towers. The gas-liquid separator is used for removing a large amount of liquid water and carried impurities contained in the anaerobic generated biogas, ensuring that the biogas entering the desulfurizing tower is relatively pure, and the bottom of the gas-liquid separator is provided with a drain pipe, so that the gas-liquid separator is required to be drained every day.
In the embodiment, the wet desulfurization towers are two-stage serial desulfurization towers, each desulfurization tower is provided with two layers of fillers, and the wet desulfurization towers are places where hydrogen sulfide in methane reacts with desulfurization liquid. The gas containing hydrogen sulfide enters from the lower part of the desulfurizing tower and is in countercurrent contact with desulfurizing liquid sprayed from the upper part of the desulfurizing tower in a packing area, the hydrogen sulfide is absorbed by the desulfurizing liquid, and the desulfurized gas is discharged from the top and is supplied to a subsequent biogas pretreatment unit after a large amount of liquid water is removed by a gas-liquid separator after passing through the tower. The active ingredients of the desulfurizing liquid are reduced after the desulfurizing liquid reacts with the hydrogen sulfide, the desulfurizing liquid is sent to a matched desulfurizing liquid regeneration unit from the bottom of the desulfurizing tower, the regenerated desulfurizing liquid recovers the absorbing capacity of the hydrogen sulfide, and the desulfurizing liquid is sent to the top of the desulfurizing tower for spraying.
As shown in fig. 2, in the present embodiment, the desulfurization liquid-regenerating unit 3 includes: the liquid outlets of the bottoms of the first-stage desulfurizing tower 21 and the second-stage desulfurizing tower 22 are connected with the rich liquid tank 311, and the rich liquid tank 311 is used for collecting sulfur-containing wastewater. The rich liquid tank 311 is connected to the regeneration tower 321, and the sulfur-containing wastewater is oxidized and regenerated in the regeneration tower 321. The regeneration tower 321 is connected with the lean solution tank 331, the lean solution regenerated in the regeneration tower 321 is conveyed into the lean solution tank 331, the lean solution tank 331 is respectively connected with the liquid outlets at the tops of the primary desulfurization tower 21 and the secondary desulfurization tower 22, and the lean solution in the lean solution tank 331 is conveyed into the desulfurization tower for spraying, circulating and absorbing hydrogen sulfide in methane.
As shown in fig. 2, in this embodiment, the desulfurization solution regeneration unit 3 further includes a sulfur foam tank 341, a filter press 343, and a liquid storage tank 344 sequentially connected, the regeneration tower 321 is connected to the sulfur foam tank 341, elemental sulfur precipitated in the regeneration tower 321 is suspended at the top of the regeneration tower 321 and overflows into the sulfur foam tank 341, and then is conveyed to the filter press 343 to filter and separate out elemental sulfur, and the filtered clear solution flows into the liquid storage tank 344 and is conveyed to the rich solution tank 31 for recycling.
Specifically, the desulfurization solution is complex iron alkaline desulfurization solution, and the basic principle is as follows: biogas containing hydrogen sulphide is first alkaline (Na 2 CO 3 ) Absorbing the aqueous solution and reacting with alkali to generate HS - The purification process of hydrogen sulfide in the gas is realized. The desulfurization liquid regeneration unit 3 is composed of a rich liquid tank 311, a rich liquid pump 312, a regeneration tower 321, a lean liquid tank 331, a lean liquid pump 332, a sulfur foam tank 341, a filter press 343, and the like. The complex iron desulfurizing liquid absorbed with hydrogen sulfide flows into the rich liquid tank 311 from the bottom of the desulfurizing tower, is conveyed into the regenerating tower 321 through the rich liquid pump 312, contacts with air blown in by the regenerating fan 322 in the regenerating tower 321 for oxidation regeneration, and an air cooling radiator 323 is arranged on an outlet pipeline of the regenerating fan 322 for cooling the air so as to ensure that the regenerating temperature is in a reasonable range of 30-40 ℃. The regenerated lean solution overflows from the upper part of the regeneration tank 321 to enter a lean solution tank 331, and is conveyed into the upper part of the desulfurizing tower by a lean solution pump 332 to carry out spray circulation to absorb hydrogen sulfide. The lean liquid tank 331 is provided with a tap water supplementing pipeline and a desulfurizing liquid supplementing pipeline, and is used for supplementing the water volatilization and the desulfurizing liquid loss in the operation process of the methane desulfurizing unit 2. Elemental sulfur precipitated in the regeneration tower 321 is suspended at the top of the regeneration tower 321, overflows into a sulfur foam tank 341, is conveyed into a filter press 343 by a conveying pump 342 to be filtered and separated into elemental sulfur, and the filtered clear liquid flows into a liquid storage tank 344 and is conveyed into a rich liquid tank 311 by a reflux pump 345 for recycling.
The principle involved in the regeneration of the desulfurizing liquid is as follows:
(1) During the purification process, the alkalinity of the solution decreases, in the presence of HS - In a liquid system with the complex trivalent Fe ions, HS is generated due to the strong oxidizing property of the trivalent Fe ions - Oxidizing into elemental sulfur, and simultaneously reducing the complex trivalent Fe ions into complex divalent Fe ions, wherein the process is sulfur separation and oxidation.
Sulfur separation process: 2Fe 3+ (Complex) +HS - →2Fe 2+ (Complex state) +S +.cndot.H +
(2) In the regeneration process, the complex divalent Fe ion solution is oxidized into complex trivalent Fe ion solution by contacting with air, and meanwhile, the alkalinity of the solution is improved, and the alkali absorption capacity of the solution on hydrogen sulfide is recovered.
The regeneration process comprises the following steps: 2Fe 2+ (Complex state) +1/2O 2 +H 2 O→2Fe 3+ (Complex state) +OH -
2NaHCO 3 →Na 2 CO 3 +CO 2 +H 2 O
The process is a working cycle of absorption, oxidation/regeneration, and realizes regeneration of alkali liquor and oxidant. Due to the existence of side reactions and the gradual failure of the complex iron under the action of oxygen, the system needs to be periodically supplemented and replaced.
In the embodiment, the biogas desulfurization unit 2 adopts two-stage wet desulfurization, has high chemical reaction rate, and can be used for controlling the flow rate and H of the front-end biogas as compared with the dry desulfurization and biological desulfurization 2 The concentration of S and the spraying amount of the desulfurizing liquid are timely adjusted, the working condition matching degree is high, the load resistance is high, and the desulfurizing effect is stable. Meanwhile, the desulfurization solution regeneration unit 3 is matched, the working cycle of 'absorption- & gt oxidation/regeneration- & gt absorption- & gt oxidation/regeneration' can be carried out through blast aeration according to the redox properties of iron ions in different valence states in the desulfurization solution and the carbonic acid balance in the solution, the regeneration of alkali liquor and oxidant is realized, the desulfurization solution can be recycled, and the running cost is effectively reduced.
As shown in fig. 1, in the present embodiment, the purifying unit 4 includes a coarse filter 41, a water-gas heat exchanger 42, a third gas-liquid separator 73, a Roots blower 45, an air-cooled radiator 47, and a fine filter 48, which are sequentially connected, wherein an input end of the coarse filter 41 is connected to an output end of the second gas-liquid separator 72, and an output end of the fine filter 48 is connected to the flare emergency unit 5 and the combustion power generation unit 6, respectively. The coarse filter 41 is used for removing particles in the biogas, the third gas-liquid separator 73 is used for further removing the residual fine liquid drops in the biogas at the outlet of the water-gas heat exchanger 42, so that the humidity is reduced, and the fine filter 48 is used for further removing the fine particles in the biogas. The water and the particulate impurities in the methane can be efficiently removed through the pretreatment unit 4, and the dehydrated and purified methane is pressurized and conveyed to the torch emergency unit 5 or the combustion power generation unit 6 at the rear end through the Roots blower 45.
The purification treatment unit 4 further comprises a water chilling unit 43 and an energy storage water tank 44, wherein the water chilling unit 43 and the energy storage water tank 44 are both connected with the water-gas heat exchanger 42 and used for cooling methane so as to greatly reduce the humidity in the methane, and a large amount of condensed water generated by cooling the methane is discharged from the bottom of the water-gas heat exchanger 42.
The purification unit 4 further comprises a safety valve 46, an input end of the safety valve 46 is connected with the Roots blower 45, and an output end of the safety valve 46 is connected with an air-cooled radiator 47.
The purification treatment unit 4 further comprises a first flame arrester 91, the input end of the first flame arrester 91 is connected with the coarse filter 41, and the output end of the first flame arrester 91 is connected with the moisture heat exchanger 42.
Compared with the prior biogas treatment system which mainly considers biogas desulfurization, the utility model comprehensively considers other components influencing biogas combustion, designs a scientific and reasonable biogas pretreatment unit, and efficiently removes moisture and particulate impurities in the biogas pretreatment unit.
As shown in fig. 1, in this embodiment, a second flame arrestor 92 and a third flame arrestor 93 are also included. The input of the second flame arrestor 92 is connected to the precision filter 48 and the output of the second flame arrestor 92 is connected to the flare-emergency unit 5. The flame arrester is arranged on the air inlet end pipeline of the torch 51, and is a safety measure for preventing the torch 51 from being tempered to the biogas pipe network at the front end due to pressure mismatch. The input end of the third flame arrester 93 is connected with the precision filter 48, and the output end of the third flame arrester 93 is connected with the combustion power generation unit 6. The third flame arrester 93 is arranged on the air inlet end pipeline of the combustion generator set, and is a safety measure for preventing methane from backfire.
As shown in fig. 1, in this embodiment, a condensate well 8 is further included. The marsh gas desulfurization unit 2 and the purification treatment unit 4 are both connected with a condensate water well 8, the condensate water well 8 is connected with a sewage pipe network, and the condensate water well 8 is used for collecting wastewater discharged from the marsh gas desulfurization unit 2 and the purification treatment unit 4. Specifically, the first gas-liquid separator 71, the second gas-liquid separator 72, the third gas-liquid separator 73, the coarse filter 41, the water-gas heat exchanger 42 and the precise filter 48 all have the function of removing water in biogas of the sewage station, drain pipes are arranged at the bottoms of the first gas-liquid separator, the second gas-liquid separator 72, the third gas-liquid separator and the precise filter 48, the condensate water well 8 is required to be drained periodically, and the waste water in the well is connected to a sewage pipe network.
Example 2
The garbage leachate generated by a certain household garbage incineration plant belongs to high-concentration organic wastewater, COD is up to 60000mg/L, a UASB anaerobic reactor is adopted in a matched leachate treatment system, and the treatment scale is designed to be 1800m 3 /d, methane yield 36000m 3 /d, the main component being CH 4 And CO 2 Contains H 2 S and particle impurities, simultaneously carrying a large amount of moisture and a small amount of gases such as hydrogen, oxygen, nitrogen and the like, H 2 S content is 4000-6000 ppm. Air inlet H of biogas generator 2 The S content is required to be less than 100ppm.
H in biogas after the landfill leachate is treated by the power generation system in the embodiment 1 2 The S content can reach less than or equal to 100ppm, the diameter of dust particles is less than or equal to 3 mu m, and the dust content is less than or equal to 3mg/m 3 The humidity in the biogas is greatly reduced, and the air inlet condition of the biogas generator is well met.
While the utility model has been described with reference to preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model or equivalent embodiments using the method and technical solution disclosed above without departing from the spirit and technical solution of the present utility model. Therefore, any simple modification, equivalent substitution, equivalent variation and modification of the above embodiments according to the technical substance of the present utility model, which do not depart from the technical solution of the present utility model, still fall within the scope of the technical solution of the present utility model.
Claims (10)
1. A sewage plant biogas power generation system, comprising: the device comprises an anaerobic gas production unit (1), a biogas desulfurization unit (2), a desulfurization liquid regeneration unit (3), a purification treatment unit (4), a torch emergency unit (5) and a combustion power generation unit (6); the anaerobic gas production unit (1), the biogas desulfurization unit (2), the purification treatment unit (4) and the combustion power generation unit (6) are sequentially connected, biogas generated by the anaerobic gas production unit (1) is input into the biogas desulfurization unit (2) for desulfurization treatment, desulfurized biogas is input into the purification treatment unit (4) for dehydration and impurity removal, and purified biogas is input into the combustion power generation unit (6) for power generation; the biogas desulfurization unit (2) is also connected with the desulfurization liquid regeneration unit (3), and the sulfur-containing wastewater generated in the biogas desulfurization unit (2) is input into the desulfurization liquid regeneration unit (3) for recycling; the anaerobic gas production unit (1), the biogas desulfurization unit (2) and the purification treatment unit (4) are connected with the torch emergency unit (5), and the torch emergency unit (5) is used for system fault maintenance and emergency of emergencies.
2. The sewage station biogas power generation system according to claim 1, wherein the biogas desulfurization unit (2) comprises a first gas-liquid separator (71), a first-stage desulfurization tower (21), a second-stage desulfurization tower (22) and a second gas-liquid separator (72) which are sequentially connected, the input end of the first gas-liquid separator (71) is connected with the anaerobic gas generation unit (1), and the output end of the second gas-liquid separator (72) is respectively connected with the purification treatment unit (4) and the torch emergency unit (5); the first-stage desulfurizing tower (21) and the second-stage desulfurizing tower (22) are connected with the desulfurizing liquid regeneration unit (3).
3. The sewage station biogas power generation system according to claim 2, wherein the desulfurization liquid regeneration unit (3) comprises: the device comprises a rich liquid tank (311), a regeneration tower (321) and a lean liquid tank (331), wherein liquid outlets at the bottoms of the primary desulfurization tower (21) and the secondary desulfurization tower (22) are connected with the rich liquid tank (311), and the rich liquid tank (311) is used for collecting sulfur-containing wastewater; the rich liquid tank (311) is connected with a regeneration tower (321), and the sulfur-containing wastewater is oxidized and regenerated in the regeneration tower (321); the regeneration tower (321) is connected with the lean solution tank (331), the lean solution regenerated in the regeneration tower (321) is conveyed into the lean solution tank (331), the lean solution tank (331) is respectively connected with liquid outlets at the tops of the primary desulfurization tower (21) and the secondary desulfurization tower (22), and the lean solution in the lean solution tank (331) is conveyed into the desulfurization tower for spraying, circulating and absorbing hydrogen sulfide in methane.
4. A biogas power generation system in a sewage station according to claim 3, wherein the desulfurization liquid regeneration unit (3) further comprises a sulfur foam tank (341), a filter press (343) and a liquid storage tank (344) which are sequentially connected, the regeneration tower (321) is connected with the sulfur foam tank (341), elemental sulfur precipitated in the regeneration tower (321) is suspended at the top of the regeneration tower (321) and overflows into the sulfur foam tank (341), the elemental sulfur is filtered and separated by the filter press (343), and filtered clear liquid flows into the liquid storage tank (344) and is conveyed into the rich liquid tank (311) for recycling.
5. The biogas power generation system of the sewage station according to claim 2, wherein the purification treatment unit (4) comprises a coarse filter (41), a water-gas heat exchanger (42), a third gas-liquid separator (73), a Roots blower (45), an air cooling radiator (47) and a precise filter (48) which are sequentially connected, the input end of the coarse filter (41) is connected with the output end of the second gas-liquid separator (72), and the output end of the precise filter (48) is respectively connected with the torch emergency unit (5) and the combustion power generation unit (6).
6. The biogas power generation system of a sewage station according to claim 5, wherein the purification treatment unit (4) further comprises a water chiller (43) and an energy storage water tank (44), and both the water chiller (43) and the energy storage water tank (44) are connected with the water-gas heat exchanger (42).
7. The biogas power generation system of a sewage station according to claim 5, characterized in that the purification treatment unit (4) further comprises a safety valve (46), the input end of the safety valve (46) is connected with a Roots blower (45), and the output end of the safety valve (46) is connected with an air-cooled radiator (47).
8. The sewage plant biogas power generation system according to claim 5, characterized in that the purification treatment unit (4) further comprises a first flame arrester (91), the input end of the first flame arrester (91) is connected with the coarse filter (41), and the output end of the first flame arrester (91) is connected with the hydro-pneumatic heat exchanger (42).
9. The sewage station biogas power generation system according to any one of claims 5 to 8, further comprising a second flame arrestor (92) and a third flame arrestor (93), wherein the input of the second flame arrestor (92) is connected to the precision filter (48), and the output of the second flame arrestor (92) is connected to the flare emergency unit (5); the input end of the third flame arrester (93) is connected with the precision filter (48), and the output end of the third flame arrester (93) is connected with the combustion power generation unit (6).
10. The sewage station biogas power generation system according to any one of claims 1 to 8, further comprising a condensate well (8), wherein the biogas desulfurization unit (2) and the purification treatment unit (4) are both connected to the condensate well (8), and wherein the condensate well (8) is connected to a sewage pipe network, and wherein the condensate well (8) is used for collecting wastewater discharged from the biogas desulfurization unit (2) and the purification treatment unit (4).
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