CN210505889U - System for performing biogas desulfurization by using electrolysis and air flotation biogas slurry treatment - Google Patents
System for performing biogas desulfurization by using electrolysis and air flotation biogas slurry treatment Download PDFInfo
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- CN210505889U CN210505889U CN201920891023.4U CN201920891023U CN210505889U CN 210505889 U CN210505889 U CN 210505889U CN 201920891023 U CN201920891023 U CN 201920891023U CN 210505889 U CN210505889 U CN 210505889U
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Abstract
A system for performing biogas desulfurization by using electrolysis and air flotation to treat biogas slurry comprises a sedimentation tank, an electrolytic tank, an air flotation machine, a desulfurization tower, a water condenser and a dry-type desulfurization tank. The biogas slurry sequentially passes through the electrolytic tank and reacts with the biogas slurry in the electrolytic tank, then enters the desulfurizing tower, sequentially enters the water condenser and the dry desulfurizing tank, and then is discharged to clean biogas, and the biogas slurry sequentially passes through the sedimentation tank, the electrolytic tank and the air flotation tank, then is sprayed into the desulfurizing tower and returns to the electrolytic tank for recycling. Through two circulation ways of methane and biogas slurry, and the methane and the biogas slurry are contacted in an electrolytic cell and a desulfurizing towerAnd (4) reaction is carried out, so that biogas desulfurization is completed, and subsequent biogas slurry treatment is facilitated. The removal rate of COD in the biogas slurry reaches 28 percent after passing through the system, and H in the biogas slurry2The removal rate of S was 99.9%.
Description
Technical Field
The utility model belongs to the technical field of large-scale marsh gas desulfurization using livestock and poultry feces as raw materials, in particular to a system for carrying out marsh gas desulfurization by using electrolysis and air flotation to treat marsh liquid.
Background
In large-scale biogas engineering using livestock and poultry manure as a raw material, biogas generated by anaerobic fermentation contains a large amount of hydrogen sulfide gas, and the content of hydrogen sulfide is usually 1000ppm-5000 ppm. Hydrogen sulfide is not only a toxic and harmful gas, but also sulfur dioxide generated after combustion has strong corrosivity on combustion equipment and metal pipelines, and is discharged into the air to cause atmospheric pollution. Therefore, in order to safely utilize the biogas, the biogas must be desulfurized before use.
At present, the removal method of high-concentration hydrogen sulfide in large-scale biogas engineering mainly comprises two methods of alkaline desulfurization and biological desulfurization. Alkaline desulfurization generally uses an alkaline solution with a pH value of more than 8.0 as an adsorbent to absorb hydrogen sulfide in biogas, and an oxygen carrier is used as a catalyst to convert the hydrogen sulfide into elemental sulfur. The existing alkaline desulphurization system needs to consume alkaline liquor; the separation of elemental sulfur is difficult, and the problems of filler blockage and the like are often caused by overhigh suspended sulfur; the oxygen supply amount is large, and the energy consumption of the system is high.
The biological desulfurization is to convert hydrogen sulfide in the methane into elemental sulfur or sulfate radical by utilizing the action of desulfurization microbial floras, thereby removing the hydrogen sulfide in the methane. For example, the biogas biological desulfurization method, 201210075244.7, mainly realizes biological desulfurization through the action of aerobic desulfurization flora. However, the existing biological desulfurization process has a plurality of problems, the dissolved oxygen of the absorption liquid is difficult to control, and the desulfurization microbial flora is difficult to adapt to the change of gas quantity, so that the desulfurization effect is unstable.
In addition, 201410081589.2 is mainly used for removing hydrogen sulfide in biogas by utilizing the biogas slurry after electric flocculation, for biogas with high hydrogen sulfide content, multi-stage repeated desulfurization needs to be carried out, the electrode consumption is fast, and the treatment capacity and the desulfurization efficiency cannot meet the engineering requirements easily.
Use the dirty marsh gas engineering as the raw materials of beasts and birds excrement, the marsh liquid of its production is handled the back through aeration or other modes, and its pH value can rise, through the utility model discloses discovery after the research, this marsh liquid has and absorbs H in the marsh gas2The ability of S. Therefore, the H in the biogas can be treated by utilizing the biogas slurry generated in the biogas engineering2S。
The air floatation is a sewage treatment method, which forms highly dispersed micro bubbles in water, adheres solid or liquid particles of hydrophobic groups in the wastewater to form a water-gas-particle three-phase mixed system, forms flocs with apparent density smaller than that of the water after the particles adhere to the bubbles and floats to the water surface to form a scum layer which is scraped, thereby realizing the process of separating solid from liquid or liquid from liquid. The air flotation can effectively separate suspended particles from the biogas slurry while realizing the aeration of the biogas slurry. At present, air flotation is applied to the aspects of water supply, industrial wastewater and municipal sewage treatment, but the prior art does not relate to how to effectively apply the air flotation technology to a biogas desulfurization process taking livestock and poultry manure as a raw material.
The utility model aims at the problems of high energy consumption and poor control of the desulfurization method in the prior art; the operation is complicated, and the desulfurization efficiency is low; the system for performing biogas desulfurization by using the biogas slurry treated by electrolysis and air flotation has the advantages of high desulfurization cost, difficult treatment of elemental sulfur and sulfide precipitation and the like.
SUMMERY OF THE UTILITY MODEL
Aiming at overcoming the defects of high energy consumption and poor control of the desulfurization method in the prior art; the operation is complicated, and the desulfurization efficiency is low; the desulfurization is with high costs, and simple substance sulphur, sulphide precipitate not good processing scheduling problem, the utility model provides an use electrolysis and air supporting to handle natural pond liquid and carry out marsh gas desulfurization's system.
A system for performing biogas desulfurization by using electrolysis and air flotation biogas slurry treatment comprises a sedimentation tank, an electrolytic tank, an air flotation machine, a desulfurization tower, a water condenser and a dry-type desulfurization tank; the device is characterized in that the sedimentation tank comprises a biogas slurry inlet and a biogas slurry outlet; the electrolytic cell comprises 2 biogas slurry inlets and a biogas slurry outlet, and a biogas inlet and a biogas outlet, and the air flotation machine comprises a biogas slurry inlet and a biogas slurry outlet; the desulfurizing tower comprises a biogas slurry inlet, a biogas slurry outlet, a biogas inlet and a biogas outlet; the water condenser comprises a methane inlet and a methane outlet; the dry-type desulfurizing tank comprises a marsh gas inlet and a marsh gas outlet; a biogas slurry inlet of the sedimentation tank is a first biogas slurry inlet, a biogas slurry outlet of the sedimentation tank is connected with a first biogas slurry inlet of the electrolytic tank, a biogas slurry outlet of the electrolytic tank is connected with a biogas slurry inlet of the air flotation machine, a biogas slurry outlet of the air flotation machine is connected with a biogas slurry inlet of the desulfurizing tower, and a biogas slurry inlet of the desulfurizing tower is turned back to be connected with a second biogas slurry inlet of the electrolytic tank; a methane inlet of the electrolytic cell is a first methane inlet; a methane outlet of the electrolytic cell is connected with a methane inlet of the desulfurizing tower; the biogas outlet of the desulfurizing tower is connected with the biogas inlet of the water condenser, the biogas outlet of the water condenser is connected with the biogas inlet of the dry-type desulfurizing tank, and clean biogas is discharged from the biogas outlet of the dry-type desulfurizing tank. Through the biogas slurry circulation channel and the biogas slurry circulation channel, the biogas slurry passes through the apparatus structures in sequence, and once enters the system, the biogas slurry is circularly treated for multiple times and then is replaced next time. The system and the method can directly utilize biogas slurry to carry out biogas desulfurization, and the biogas slurry used by the desulfurization system is fresh biogas slurry generated by an anaerobic fermentation system taking livestock and poultry feces as raw materials, and no other raw materials are needed to be added.
Further, a water inlet pump is arranged between the sedimentation tank and the electrolytic tank, and the purpose of the arrangement of the water inlet pump is to improve the transfer speed of the biogas slurry so as to improve the overall running speed of the system.
Furthermore, a water inlet pump is also arranged between the electrolytic cell and the air floatation machine, so that the transfer speed of the biogas slurry is improved.
Further, a spray pump is arranged between the air floatation machine and the desulfurizing tower; the spraying pump is arranged to realize the accelerated transfer of the biogas slurry and realize the uniform ejection of the biogas slurry above the desulfurizing tower.
Further, the air supporting machine comprises an air supporting tank, a dissolved air tank, a backflow water pump, a foam scraping machine and an air compressor, and the air supporting purpose is achieved through the arrangement. The upper end of the air floatation tank is provided with a foam scraper; the front of the air floatation tank is connected with a methane outlet of the electrolytic tank; the back of the tank is connected with a reflux water pump, the reflux water pump is connected with a dissolved air tank, and the dissolved air tank is connected with an air floatation tank; the dissolved air tank is also connected with an air compressor; the air floatation tank is also provided with a biogas slurry outlet connected with the desulfurizing tower; circulating the biogas slurry in the air flotation machine for several times; enters the desulfurizing tower through a biogas slurry outlet connected with the desulfurizing tower.
Further, a biogas slurry outlet of the air floatation tank is connected with a spray pump, a spray head is arranged on the spray pump, and the spray head is a biogas slurry inlet of the desulfurizing tower.
Further, the electrolytic cell is equipped with metal material's positive pole and negative pole, and the positive pole can set up a plurality ofly, and the positive pole sets up 2 ~ 6, and the circular telegram makes the metal ion in the natural pond liquid gather at the positive pole, and the electrolytic cell is closed electrolytic cell.
Further, the total current range of the electrolytic cell is 5-20A.
Further, the bottom of the desulfurization tower is provided with a biogas slurry outlet and is connected with a second biogas slurry inlet at the cathode end of the electrolytic cell, and the biogas slurry can be recycled for a period of time by the aid of the arrangement.
Further, the dry-type desulfurizing tank is a dry-type desulfurizing tank filled with desulfurizing agents such as iron oxide and active carbon.
The utility model also discloses a method for using electrolysis and air supporting to handle natural pond liquid and carry out marsh gas desulfurization:
(1) the biogas slurry firstly enters a sedimentation tank through a conveying pipeline, and large particle impurities in the biogas slurry are removed through preliminary sedimentation.
(2) The biogas slurry is from a sedimentation tank during primary use, and then is recycled through various devices in sequence; the biogas is led into the anode end of the electrolytic cell, and metal ions in the biogas slurry can react with H absorbed in the biogas slurry2S reacts to form a precipitate, thereby partially H2S is removed, the precipitate and organic matters in the biogas slurry form a hydroxyl complex to generate flocculent suspended matters, and then the flocculent suspended matters enter an air floatation machine through a pump for treatment.
(3) Pumping the biogas slurry in the electrolytic cell into an air floatation machine, pumping the biogas slurry in the electrolytic cell into the air floatation machine under the action of air floatation, and absorbing H in the biogas slurry under the action of air floatation2S is oxidized into elemental sulfur, and the generated elemental sulfur is flocculated in the biogas slurryThe condensate and the solid particles are adsorbed and separated together, and the CO in the biogas slurry can be blown off in the air floatation process2Thereby recovering the biogas slurry to absorb H2S gas capacity.
(4) The biogas slurry after the air floatation treatment enters the upper end of the desulfurizing tower through a spray pump, and a spray head uniformly sprays biogas slurry downwards; the biogas enters the lower end of the desulfurizing tower through a conveying pipeline, the middle part of the desulfurizing tower is provided with a filler, the biogas and the biogas slurry are contacted in the tower, and the hydrogen sulfide can be absorbed into the biogas slurry, so that the hydrogen sulfide in the biogas is removed.
(5) The water content of the marsh gas after passing through the desulfurizing tower is reduced by a water condenser, and then the marsh gas passes through a dry desulfurizing tank to obtain clean marsh gas.
Further, the biogas slurry in the step (1) is added in an amount of per 10000m3The additive amount of the biogas slurry is 10-80m3。
Furthermore, the flow rate of the methane in the electrolytic cell is between 0.5vvm and 3 vvm.
Further, the hydraulic retention time of the air floatation tank is 5-30 min, and the surface load rate is 2.5-8 m3/(m2.h)。
Further, in the step (4), the gas-liquid ratio is controlled to be 8: 1-12: 1;
further, the biogas slurry of the whole desulfurization system needs to be replaced once every 12 hours. Or as H at the methane outlet end of the desulfurizing tower2When the S removal rate is less than 95%, or the outlet H2When the concentration of S is higher than 200ppm, the biogas slurry needs to be replaced. After the biogas slurry is subjected to electrolysis and air flotation for many times, metal ions and organic colloid in the biogas slurry are reduced, so that the desulfurization effect is reduced.
Further, the method for treating biogas slurry to perform biogas desulfurization comprises the following steps:
(1) fresh biogas slurry discharged by the anaerobic fermentation tank firstly enters a sedimentation tank through a biogas slurry conveying pipeline through a biogas slurry conveying pump, and is precipitated for 24 hours for preliminarily precipitating and removing large-particle impurities in the biogas slurry.
(2) The biogas slurry is from the sedimentation tank during the primary use, and then is recycled. The electrolytic cell is provided with a plurality of anodes and cathodes made of metal materials, the number of the anodes is usually 2-6, and the metal ions in the biogas slurry are made by electrifyingGathering at the anode, introducing marsh gas into the anode of the closed electrolytic cell, and allowing metal ions in the marsh gas to react with H absorbed in the marsh gas2S reacts to form a precipitate, thereby partially H2S is removed, the precipitate and organic matters in the biogas slurry form a hydroxyl complex to generate flocculent suspended matters, and then the flocculent suspended matters enter an air floatation machine through a pump for treatment. The flow rate of the methane in the electrolytic cell is between 0.5vvm and 3 vvm.
(3) Pumping the biogas slurry in the electrolytic cell into an air floatation machine, and absorbing H in the biogas slurry through the air floatation effect2S is oxidized into elemental sulfur, the generated elemental sulfur is adsorbed by flocculates and solid particles in the biogas slurry and is separated together, and CO in the biogas slurry is separated in the air floatation process2Is blown off，Thereby recovering the biogas slurry to absorb H2S gas capacity. The hydraulic retention time of the air flotation machine is 5-30 min, and the surface load rate is 2.5-8 m3/(m2.h)。
(4) The biogas slurry after the air floatation treatment enters the upper end of the desulfurizing tower through a spray pump, and a spray head uniformly sprays biogas slurry downwards; biogas generated by the anaerobic tank enters the lower end of the desulfurizing tower through a biogas conveying pipeline, and the gas-liquid ratio is controlled to be 8: 1-12: 1; the middle part of the desulfurizing tower is provided with a filler, the biogas and the biogas slurry are contacted in the tower, and hydrogen sulfide can be absorbed into the biogas slurry, so that the hydrogen sulfide in the biogas can be removed. The bottom of the desulfurizing tower is communicated with the cathode end of the electrolytic cell, and the biogas slurry can be recycled.
(5) Biogas H after passing through a desulfurizing tower2The treatment precision of S can reach 100ppm level, the water content is reduced by the water condenser, and then H is treated by the dry-type desulfurizing tank2The concentration of S is treated to be less than 6 ppm. The dry type desulfurizing tank is filled with desulfurizing agents such as ferric oxide, active carbon and the like.
(6) The biogas slurry of the whole desulfurization system needs to be replaced once every 12 hours. Or when H is at the methane outlet end of the desulfurizing tower2When the S removal rate is less than 95%, or the outlet H2When the concentration of S is higher than 200ppm, the biogas slurry needs to be replaced.
Compared with the prior art, the technical scheme of the utility model following technical advantage has:
1. the utility model relates to a system and a method for directly utilizing biogas slurry to desulfurize biogas.
2. No other chemical substance is added: the natural pond liquid that desulfurization system used does not need to add any other chemical for the fresh natural pond liquid that the anaerobic fermentation system that uses the beasts and birds excrement to dirty as the raw materials produced, like alkali, catalyst, nutrient solution etc..
3. The process is simple and the operation is convenient: the utility model discloses a biogas desulfurization method, in the electrolytic treatment process, the metal ions at the anode end can be absorbed with H in biogas and biogas slurry2S reacts to generate FeS and other sediment substances, and the sediment and organic matters in the biogas slurry form hydroxyl complex to generate flocculate; in the air flotation process, H2S is oxidized into elemental sulfur, and the generated elemental sulfur is adsorbed by flocs and solid particles in the biogas slurry and is separated together. Therefore, the utility model discloses an air supporting machine has realized H simultaneously2The process of S oxidation to elemental sulfur and the process of elemental sulfur separation do not need to add extra process and equipment, and compared with the traditional alkaline desulfurization and biological desulfurization, the process is simple and convenient to operate.
4. The desulfurization effect is obvious: system for utilize natural pond liquid to realize marsh gas desulfurization purification, can be with H in the marsh gas2S is treated to less than 6ppm, H2The S removal rate can reach 99 percent, and the desulfurization effect is very obvious.
5. The biogas slurry can be recycled: h absorbed by biogas slurry after electrolysis and air flotation treatment2S is oxidized into elemental sulfur, and CO absorbed by biogas slurry2Is blown off to improve the pH value of the biogas slurry, thereby recovering the H absorption of the biogas slurry2The S gas capacity can remove flocculate, solid particles and elemental sulfur particles in the biogas slurry, so that the filler is prevented from being blocked in the desulfurizing tower, the gas-liquid contact effect is prevented from being influenced, and the recycling of the biogas slurry can be realized.
6. Improving the methane content in the biogas: the biogas slurry treated by electrolysis and air flotation can absorb a part of CO2And the methane content in the biogas is improved by 2 percent.
7. Is beneficial to biogas slurry treatment: most of solid particles in the biogas slurry can be removed through the electrolyzed and air floated biogas slurry, the COD of the biogas slurry is reduced by 20%, and the subsequent treatment of the biogas slurry is facilitated.
Drawings
FIG. 1 is a schematic view of the structure of the structural formula of embodiment 4 of the present invention;
fig. 2 is a flow chart of embodiment 4 of the present invention;
FIG. 3 is a schematic view of the structure of the structural formula of embodiment 5 of the present invention;
fig. 4 is a flow chart of embodiment 5 of the present invention;
in the figure, 1, a sedimentation tank; 11. a water inlet pump; 2. an electrolytic cell; 3. an air flotation machine; 31. a dissolved air tank; 32. A foam scraping machine; 33. a reflux water pump; 34. an air compressor; 4. a spray pump; 5. a desulfurizing tower; 6. a water condenser; 7. a dry-type devulcanizer.
Detailed Description
Embodiment 1 a system for biogas desulfurization by using biogas slurry treated by electrolysis and air flotation
A system for performing biogas desulfurization by using electrolysis and air flotation biogas slurry treatment comprises a sedimentation tank 1, an electrolytic tank 2, an air flotation machine 3, a desulfurization tower 5, a water condenser 6 and a dry-type desulfurization tank 7; the device is characterized in that the sedimentation tank 1 comprises a biogas slurry inlet and a biogas slurry outlet; the electrolytic cell 2 comprises 2 biogas slurry inlets and a biogas slurry outlet, and a biogas inlet and a biogas outlet, and the air flotation machine 3 comprises a biogas slurry inlet and a biogas slurry outlet; the desulfurizing tower 5 comprises a biogas slurry inlet, a biogas slurry outlet, a biogas inlet and a biogas outlet; the water condenser 6 comprises a methane inlet and a methane outlet; the dry-type desulfurizing tank 7 comprises a marsh gas inlet and a marsh gas outlet; a biogas slurry inlet of the sedimentation tank 1 is a first biogas slurry inlet, a biogas slurry outlet of the sedimentation tank 1 is connected with a first biogas slurry inlet of the electrolytic tank 2, a biogas slurry outlet of the electrolytic tank 2 is connected with a biogas slurry inlet of the air flotation machine 3, a biogas slurry outlet of the air flotation machine 3 is connected with a biogas slurry inlet of the desulfurizing tower 5, and a biogas slurry inlet of the desulfurizing tower 5 is turned back to be connected with a second biogas slurry inlet of the electrolytic tank 2; a biogas inlet of the electrolytic cell 2 is a first biogas inlet; a methane outlet of the electrolytic cell 2 is connected with a methane inlet of the desulfurizing tower 5; the biogas outlet of the desulfurizing tower 5 is connected with the biogas inlet of the water condenser 6, the biogas outlet of the water condenser 6 is connected with the biogas inlet of the dry desulfurizing tank 7, and the biogas outlet of the dry desulfurizing tank 7 discharges clean biogas. Through the biogas slurry circulation channel and the biogas slurry circulation channel, biogas desulfurization can be directly carried out by utilizing biogas slurry sequentially through the instrument structures, and the biogas slurry used by the desulfurization system is fresh biogas slurry generated by an anaerobic fermentation system taking livestock and poultry feces as raw materials, and does not need to be added with any other raw materials. The bottom of the desulfurizing tower 5 is provided with a biogas slurry outlet and is connected with a second biogas slurry inlet at the cathode end of the electrolytic cell 2, and the purpose of the arrangement can ensure that the biogas slurry can be recycled for a period of time. The air flotation machine 3 comprises an air flotation tank, a dissolved air tank 31, a return water pump 33, a foam scraping machine 32 and an air compressor 34, and the air flotation purpose is realized through the arrangement. The upper end of the air floatation tank is provided with a foam scraper 32; the front of the air flotation tank is connected with a biogas slurry outlet of the electrolytic tank 2; the back is connected with a return water pump 33, the return water pump 33 is connected with a dissolved air tank 31, and the dissolved air tank 31 is connected with an air floatation tank; the dissolved air tank is also connected with an air compressor 34; the air floatation tank is also provided with a biogas slurry outlet connected with the desulfurizing tower 5; the biogas slurry is circulated in the air flotation machine 3 for a plurality of times; enters the desulfurizing tower 5 through a biogas slurry outlet connected with the desulfurizing tower 5.
Embodiment 2 a system for biogas desulfurization by using biogas slurry treated by electrolysis and air flotation
A system for performing biogas desulfurization by using electrolysis and air flotation biogas slurry treatment comprises a sedimentation tank 1, an electrolytic tank 2, an air flotation machine 3, a desulfurization tower 5, a water condenser 6 and a dry-type desulfurization tank 7; the device is characterized in that the sedimentation tank 1 comprises a biogas slurry inlet and a biogas slurry outlet; the electrolytic cell 2 comprises 2 biogas slurry inlets and a biogas slurry outlet, and a biogas inlet and a biogas outlet, and the air flotation machine 3 comprises a biogas slurry inlet and a biogas slurry outlet; the desulfurizing tower 5 comprises a biogas slurry inlet, a biogas slurry outlet, a biogas inlet and a biogas outlet; the water condenser 6 comprises a methane inlet and a methane outlet; the dry-type desulfurizing tank 7 comprises a marsh gas inlet and a marsh gas outlet; a biogas slurry inlet of the sedimentation tank 1 is a first biogas slurry inlet, a biogas slurry outlet of the sedimentation tank 1 is connected with a first biogas slurry inlet of the electrolytic tank 2, a biogas slurry outlet of the electrolytic tank 2 is connected with a biogas slurry inlet of the air flotation machine 3, a biogas slurry outlet of the air flotation machine 3 is connected with a biogas slurry inlet of the desulfurizing tower 5, and a biogas slurry inlet of the desulfurizing tower 5 is turned back to be connected with a second biogas slurry inlet of the electrolytic tank 2; a biogas inlet of the electrolytic cell 2 is a first biogas inlet; a methane outlet of the electrolytic cell 2 is connected with a methane inlet of the desulfurizing tower 5; the biogas outlet of the desulfurizing tower 5 is connected with the biogas inlet of the water condenser 6, the biogas outlet of the water condenser 6 is connected with the biogas inlet of the dry desulfurizing tank 7, and the biogas outlet of the dry desulfurizing tank 7 discharges clean biogas. The system and the method can directly utilize biogas slurry to carry out biogas desulfurization through the biogas slurry circulation channel and the biogas slurry circulation channel sequentially through the instrument structures, and the biogas slurry used by the desulfurization system is fresh biogas slurry generated by an anaerobic fermentation system taking livestock and poultry feces as raw materials, and no other raw materials are needed to be added.
A water inlet pump 11 is arranged between the sedimentation tank 1 and the electrolytic tank 2, and the purpose of the water inlet pump 11 is to improve the transfer speed of the biogas slurry so as to improve the overall operation speed of the system. A water inlet pump 11 is also arranged between the electrolytic cell 2 and the air floatation machine 3, so that the transfer speed of the biogas slurry is improved.
A spray pump 4 is arranged between the air floatation machine 3 and the desulfurizing tower 5; the spraying pump 4 is arranged to accelerate the transfer of biogas slurry and uniformly spray the biogas slurry above the desulfurizing tower 5.
The air flotation machine 3 comprises an air flotation tank, a dissolved air tank 31, a return water pump 33, a foam scraping machine 32 and an air compressor 34, and the air flotation purpose is realized through the arrangement. The upper end of the air floatation tank is provided with a foam scraper 32; the front of the air flotation tank is connected with a biogas slurry outlet of the electrolytic tank 2; the back is connected with a return water pump 33, the return water pump 33 is connected with a dissolved air tank 31, and the dissolved air tank 31 is connected with an air floatation tank; the dissolved air tank is also connected with an air compressor 34; the air floatation tank is also provided with a biogas slurry outlet connected with the desulfurizing tower 5; the biogas slurry is circulated in the air flotation machine 3 for a plurality of times; enters the desulfurizing tower 5 through a biogas slurry outlet connected with the desulfurizing tower 5. The biogas slurry outlet of the air floatation tank is firstly connected with a spray pump 4, the spray pump 4 is provided with a spray head, and the spray head is a biogas slurry inlet of a desulfurizing tower 5.
Example 3 method for biogas desulfurization by biogas slurry electrolysis and air flotation treatment
A method for performing biogas desulfurization by using biogas slurry treated by electrolysis and air flotation specifically comprises the following steps:
(1) fresh biogas slurry discharged by the anaerobic fermentation tank firstly enters the sedimentation tank 1 through a biogas slurry conveying pipeline through a biogas slurry delivery pump, and is precipitated for 24 hours, so that large particle impurities in the biogas slurry are removed through preliminary precipitation.
(2) The biogas slurry is from the sedimentation tank 1 during the primary use, and then is recycled. Electrolytic cell 2 is equipped with metal material's positive pole and negative pole, and the positive pole sets up a plurality ofly, usually 2 ~ 6 can, the circular telegram makes the metal ion in the natural pond liquid gather at the positive pole, and electrolytic cell 2 is closed electrolytic cell 2, lets in 2 positive poles of electrolytic cell with marsh gas and holds, and the metal ion in the natural pond liquid can with marsh gas in and the natural pond liquid absorbed H2S reacts to form a precipitate, thereby partially H2S is removed, the sediment and organic matters in the biogas slurry form a hydroxyl complex to generate flocculent suspended matters, and then the flocculent suspended matters enter the air flotation machine 3 through a pump for treatment. The biogas flow of the electrolytic cell 2 is between 0.5vvm and 3 vvm.
(3) Pumping the biogas slurry in the electrolytic cell 2 into an air floatation machine 3, and absorbing H in the biogas slurry by air floatation2S is oxidized into elemental sulfur, the generated elemental sulfur is adsorbed by flocculates and solid particles in the biogas slurry and is separated together, and CO in the biogas slurry is separated in the air floatation process2Is blown off，Thereby recovering the biogas slurry to absorb H2S gas capacity. The hydraulic retention time of the air flotation tank of the electrolytic tank 2 air flotation machine 3 is 5-30 min, and the surface load rate is 2.5-8 m3/(m2.h)。
(4) The biogas slurry after the air floatation treatment enters the upper end of a desulfurizing tower 5 through a spray pump 4, and a spray head sprays biogas slurry downwards and uniformly; biogas generated by the anaerobic tank enters the lower end of the desulfurizing tower 5 through a biogas conveying pipeline, and the gas-liquid ratio is controlled to be 8: 1-12: 1; the middle part of the desulfurizing tower 5 is provided with a filler, the biogas and the biogas slurry are contacted in the tower, and hydrogen sulfide can be absorbed into the biogas slurry, so that the hydrogen sulfide in the biogas is removed. The bottom of the desulfurizing tower 5 is communicated with the cathode end of the electrolytic cell 2, so that the biogas slurry can be recycled for a period of time.
(5) Biogas H after passing through the desulfurizing tower 52The treatment precision of S can reach below 50ppm, the water content is reduced by the water condenser 6, and then H is treated by the dry-type desulfurizing tank 72The concentration of S is treated to be less than 6 ppm. The dry-type desulfurizing tank 7 is filled with desulfurizing agents such as iron oxide and active carbon.
(6) The biogas slurry 12H of the whole desulfurization system is completely replaced once or is discharged from an outlet H2And replacing the biogas slurry when the concentration of S is higher than 200 ppm. The replacement interval can be determined according to the desulfurization effect. After the biogas slurry is subjected to electrolysis and air flotation for many times, metal ions and organic colloid in the biogas slurry are reduced, so that the desulfurization effect is reduced.
Example 4 method for biogas desulfurization by biogas slurry electrolysis and air flotation treatment
10000m per day3For example, the biogas slurry is prepared by performing medium-temperature anaerobic fermentation on biogas slurry at 38 ℃ for 30 days, the pH value of the biogas slurry is 8.0, 200 tons of biogas slurry can be produced every day, and H in the biogas generated by the engineering is2The S content was 3000 ppm. The process for realizing the biogas desulfurization process by utilizing biogas slurry in the project comprises the following steps:
(1) parameters of the desulfurization device: 2 sets of water inlet pumps 11 (50 m)3H), 1 spray pump 4 is arranged (50 m)3H), 1 set of air flotation machine 3 is arranged (the treatment capacity is 50 m)3Per hour, dissolved gas water amount 10m3H), the sedimentation tank 1 is provided with 1 seat (20 m)3) The desulfurizing tower 5 is provided with 1 seat (the treatment capacity is 500 m)3H), the electrolytic cell 2 is provided with 1 seat (5 m)3Current 6A), 1 water condenser 6 and 1 dry-type desulfurizing tank 7 (1.5 m)3)。
(2) Fresh biogas slurry discharged by anaerobic fermentation tank is 10m3Standing and precipitating for 1 day in a sedimentation tank 1, and removing large-particle impurities in the biogas slurry through primary precipitation.
(3) Pumping the biogas slurry clear liquid used for the first time into a desulfurization system. Firstly, electrolysis is carried out in an electrolytic cell 2, biogas is introduced to the bottom of the anode end of the electrolytic cell 2, and H absorbed in the biogas and biogas slurry2S is combined with metal ions in the biogas slurry to generate precipitate, further floc is formed, and biogas is discharged from the top of the electrolytic cell 2.
(4) Pumping biogas slurry at the anode end of the electrolytic cell 2 into an air floatation machine 3, feeding the biogas slurry subjected to air floatation treatment into the upper end of a desulfurizing tower 5 through a spray pump 4, and uniformly spraying biogas slurry downwards at a spray head; the marsh gas enters the lower end of the desulfurizing tower 5 and contacts with the marsh gas liquid in the filler H2S is absorbed by organic colloid in the biogas slurry, and the biogas is discharged from the top of the desulfurizing tower 5. The bottom of the desulfurizing tower 5 is communicated with the cathode end of the electrolytic cell 2, and the biogas slurry is recycled. Biogas H from the desulfurizing tower 52The concentration of S can be treated to be below 150ppm, and if the concentration of S exceeds 150ppm for a long time, the biogas slurry needs to be replaced.
(5) After the marsh gas passes through the water condenser 6, water in the marsh gas is removed through condensation, and then the marsh gas enters the dry-type desulfurizing tank 7.
(6) The marsh gas enters a dry-type desulfurizing tank 7, H2S is absorbed by desulfurizing agent to remove H2The concentration of S is treated to be less than 6ppm, and the H of national first-grade natural gas is achieved2And (5) standard of S content. The desulfurizer can adopt active carbon or medicaments with the same performance.
(7) Every 12h, the biogas slurry of the desulfurization system is completely replaced, so that elemental sulfur and precipitates in the biogas slurry can be taken away.
Example 5 method for biogas desulfurization by biogas slurry electrolysis and air flotation treatment
30000m in daily output3For example, the biogas slurry is prepared by performing medium-temperature anaerobic fermentation on biogas slurry at 38 ℃ for 30 days, the pH value of the biogas slurry is 8.4, 600 tons of biogas slurry can be produced every day, and H in the biogas generated by the engineering is2The S content was 5000 ppm. The process for realizing the biogas desulfurization process by utilizing biogas slurry in the project comprises the following steps:
(1) parameters of the desulfurization device: 2 sets of water inlet pumps 11 (50 m)3/h，150m3H), 2 spray pumps 4 are arranged (100 m)3H), air flotationMachine 3 is provided with 1 set (throughput 150 m)3Per hour, dissolved gas water amount 30m3H), 11 seats (60 m) of sedimentation tank3) The desulfurizing tower 5 is provided with 2 seats (the single tower treatment capacity is 1500 m)3H), the electrolytic cell 2 is provided with 1 seat (10 m)3Current 10A), 1 set of water condenser 6 and 1 set of dry-type desulfurizing tank 7 (3 m)3)。
(2) Fresh biogas slurry discharged by anaerobic fermentation tank is 40m3Standing and precipitating for 1 day in a sedimentation tank 1, and removing large-particle impurities in the biogas slurry through primary precipitation.
(3) Pumping the biogas slurry clear liquid used for the first time into a desulfurization system. Firstly, electrolysis is carried out in an electrolytic cell 2, biogas is introduced to the bottom of the anode end of the electrolytic cell 2, and H absorbed in the biogas and biogas slurry2S is combined with metal ions in the biogas slurry to generate precipitate, further floc is formed, and biogas is discharged from the top of the electrolytic cell 2.
(4) Pumping biogas slurry at the anode end of the electrolytic cell 2 into an air floatation machine 3, feeding the biogas slurry subjected to air floatation treatment into the upper ends of a desulfurizing tower 51 and a desulfurizing tower 52 through a spray pump 4, and uniformly spraying biogas slurry downwards at a spray head; the biogas enters the lower end of the desulfurizing tower 51, exits from the top of the desulfurizing tower 51, enters the lower end of the desulfurizing tower 52, and is discharged from the top of the desulfurizing tower 52. The marsh gas is contacted with the marsh liquid in the filling material H2S is absorbed by organic colloid in the biogas slurry. The bottoms of the desulfurizing towers 51 and 52 are communicated with the cathode end of the electrolytic cell 2, and the biogas slurry is recycled. Biogas H from the desulfurizing tower 522The concentration of S can be treated to be below 200ppm, and if the concentration of S exceeds 200ppm for a long time, the biogas slurry needs to be replaced.
(5) After the marsh gas passes through the water condenser 6, water in the marsh gas is removed through condensation, and then the marsh gas enters the dry-type desulfurizing tank 7.
(6) The marsh gas enters a dry-type desulfurizing tank 7, H2S is absorbed by desulfurizing agent to remove H2The concentration of S is treated to be less than 6ppm, and the H of national first-grade natural gas is achieved2And (S) standard. The desulfurizer can adopt active carbon or medicaments with the same performance.
(7) Every 12h, the biogas slurry of the desulfurization system is completely replaced, so that elemental sulfur and precipitates in the biogas slurry can be taken away.
Example 6 clean biogas and post-treatment effects of biogas slurry
The biogas detection can adopt an online biogas analyzer, a portable biogas analyzer and a simple H2S detection needle tube and methane analyzer can generally detect CH simultaneously4、CO2、H2S and the like. The COD measurement was performed by potassium dichromate method (GB 11914-1989).
With' 1 ten thousand square of daily marsh gas, initial H2S concentration is 3000ppm, COD of discharged biogas slurry is 20000 mg/L' for example, the process of the patent embodiment 4 is adopted, and H at the outlet of the desulfurizing tower 52The concentration of S can be reduced to 150ppm (the removal rate is 95%), and H is discharged after the S passes through a dry-type desulfurizing tank 72The S concentration can be reduced to below 6ppm (total removal rate is 99.8%). The biogas slurry is subjected to precipitation, electrolysis and air flotation treatment and is recycled in a desulfurization system, and the COD (chemical oxygen demand) of the biogas slurry can be reduced to 15000mg/L (removal rate is 25%) during final discharge.
The above description of the embodiments is only intended to illustrate the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several modifications can be made to the present invention, and these modifications will fall within the protection scope of the claims of the present invention.
Claims (10)
1. A system for performing biogas desulfurization by using electrolysis and air flotation biogas slurry comprises a sedimentation tank (1), an electrolytic tank (2), an air flotation machine (3), a desulfurization tower (5), a water condenser (6) and a dry-type desulfurization tank (7); the device is characterized in that the sedimentation tank (1) comprises a biogas slurry inlet and a biogas slurry outlet; the electrolytic cell (2) comprises 2 biogas slurry inlets and a biogas slurry outlet, and a biogas inlet and a biogas outlet, and the air flotation machine (3) comprises a biogas slurry inlet and a biogas slurry outlet; the desulfurizing tower (5) comprises a biogas slurry inlet, a biogas slurry outlet, a biogas inlet and a biogas outlet; the water condenser (6) comprises a methane inlet and a methane outlet; the dry-type desulfurizing tank (7) comprises a marsh gas inlet and a marsh gas outlet; a biogas slurry inlet of the sedimentation tank (1) is a first biogas slurry inlet, a biogas slurry outlet of the sedimentation tank (1) is connected with a first biogas slurry inlet of the electrolytic tank (2), a biogas slurry outlet of the electrolytic tank (2) is connected with a biogas slurry inlet of the air flotation machine (3), a biogas slurry outlet of the air flotation machine (3) is connected with a biogas slurry inlet of the desulfurizing tower (5), and a biogas slurry inlet of the desulfurizing tower (5) is turned back to be connected with a second biogas slurry inlet of the electrolytic tank (2); a biogas inlet of the electrolytic cell (2) is a first biogas inlet; a methane outlet of the electrolytic cell (2) is connected with a methane inlet of the desulfurizing tower (5); the biogas outlet of the desulfurizing tower (5) is connected with the biogas inlet of the water condenser (6), the biogas outlet of the water condenser (6) is connected with the biogas inlet of the dry desulfurizing tank (7), and clean biogas is discharged from the biogas outlet of the dry desulfurizing tank (7).
2. The system for biogas desulfurization by using electrolysis and air flotation of biogas slurry according to claim 1, characterized in that a water inlet pump (11) is disposed between the sedimentation tank (1) and the electrolytic tank (2).
3. The system for biogas desulfurization by using electrolysis and air flotation of biogas slurry as claimed in claim 1, wherein a water inlet pump (11) is also provided between the electrolysis tank (2) and the air flotation machine (3).
4. The system for biogas desulfurization by electrolysis and air flotation of biogas slurry according to claim 1, characterized in that a spray pump (4) is disposed between the air flotation machine (3) and the desulfurization tower (5).
5. The system for biogas desulfurization by using electrolysis and air flotation treatment of biogas slurry according to claim 4, characterized in that the air flotation machine (3) comprises an air flotation tank, a dissolved air tank (31), a reflux water pump (33), a foam scraping machine (32) and an air compressor (34); the upper end of the air floatation tank is provided with a foam scraper (32); the front of the air flotation tank is connected with a biogas slurry outlet of the electrolytic tank (2); the back of the tank is connected with a reflux water pump (33), the reflux water pump (33) is connected with a dissolved air tank (31), and the dissolved air tank (31) is connected with an air floatation tank; the dissolved air tank is also connected with an air compressor; the air floatation tank is also provided with a biogas slurry outlet connected with the desulfurizing tower (5); the biogas slurry is circulated in the air flotation machine (3) for a plurality of times; enters the desulfurizing tower (5) through a biogas slurry outlet connected with the desulfurizing tower (5).
6. The system for biogas desulfurization by using electrolysis and air flotation for biogas slurry treatment according to claim 5, wherein the biogas slurry outlet of the air flotation tank is connected with the spray pump (4) first, the spray pump (4) is provided with a spray head, and the spray head is the biogas slurry inlet of the desulfurization tower (5).
7. The system for biogas desulfurization by using electrolysis and air flotation for biogas slurry treatment according to claim 1, wherein the electrolytic cell (2) is provided with 2-6 anodes and cathodes made of metal materials.
8. The system for biogas desulfurization by electrolysis and air flotation of biogas slurry as recited in claim 7, wherein the number of the anodes is 3-4.
9. The system for biogas desulfurization by using electrolysis and air flotation for biogas slurry treatment according to claim 2, characterized in that the bottom of the desulfurization tower (5) is provided with a biogas slurry outlet and is connected with the second biogas slurry inlet at the cathode end of the electrolytic cell (2).
10. The system for biogas desulfurization by using electrolysis and air flotation treatment of biogas slurry according to any one of claims 1 to 8, characterized in that the dry desulfurization tank (7) is a dry desulfurization tank (7) filled with iron oxide and activated carbon desulfurizer.
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