CN112191665B - System and method for preparing biological natural gas through synergistic treatment of kitchen waste and livestock and poultry manure - Google Patents
System and method for preparing biological natural gas through synergistic treatment of kitchen waste and livestock and poultry manure Download PDFInfo
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- CN112191665B CN112191665B CN202011130054.1A CN202011130054A CN112191665B CN 112191665 B CN112191665 B CN 112191665B CN 202011130054 A CN202011130054 A CN 202011130054A CN 112191665 B CN112191665 B CN 112191665B
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/20—Waste processing or separation
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A system for preparing biological natural gas by cooperatively treating kitchen waste and livestock and poultry manure comprises a kitchen waste pretreatment system, a kitchen waste and livestock and poultry manure mixing system after treatment, an anaerobic fermentation system, a biogas purification system and an anaerobic fermentation digestion liquid preparation organic fertilizer system, wherein the biological natural gas is prepared by mixing the treated kitchen waste with the livestock and poultry manure, carrying out anaerobic fermentation, purifying biogas, dehydrating, desulfurizing and decarbonizing. The system can cooperatively treat kitchen waste and livestock and poultry manure to prepare the biological natural gas, anaerobic fermentation biogas slurry and biogas residues can be effectively utilized to produce the organic fertilizer, the whole system has no pollutant emission, and the recycling utilization of organic wastes is truly realized.
Description
Technical Field
The invention belongs to the technical field of anaerobic fermentation comprehensive treatment of kitchen waste and livestock and poultry manure, and particularly relates to a system for preparing biological natural gas by cooperative treatment of kitchen waste and livestock and poultry manure, and a method for preparing biological natural gas by cooperative treatment of kitchen waste and livestock and poultry manure.
Background
The catering industry in China is developed and is a globally known large country for diet. Along with the rapid increase of the economy in China, the living standard of people is continuously improved, the restaurant industry is rapidly developed in recent years, and the yield of kitchen waste is also increased. The kitchen waste has the characteristics of high water content, high organic matter content, easy decay and deterioration, fly and insect breeding and the like, and if the kitchen waste cannot be effectively treated in time, water pollution, air pollution and the like can be caused, the urban operation load is increased, and the living environment of urban people is influenced. The traditional kitchen waste treatment mode comprises aerobic composting, landfill after dehydration and the like, and the traditional treatment mode can realize the reduction and treatment of the kitchen waste, but has the disadvantages of deviation in treatment effect, low recycling utilization efficiency and easiness in causing secondary pollution. Currently, anaerobic fermentation treatment is a mainstream technology for kitchen waste treatment at home and abroad.
Along with the gradual strict technological progress and environmental protection requirements, the livestock and poultry cultivation industry in China presents a rapid development situation, and the traditional decentralized and small-scale cultivation mode is gradually replaced by a large-scale, intensive and regional cultivation mode. A large amount of livestock and poultry manure is generated in the large-scale livestock and poultry cultivation process, and the livestock and poultry manure has COD and BOD 5 High ammonia nitrogen content, complex pollutant components, etc. If the treatment is improper, soil pollution, water pollution, air pollution and the like can be caused, and the ecology is seriously influencedEnvironment and human living environment. The anaerobic fermentation technology is adopted for treatment, so that the livestock and poultry manure is reduced and subjected to harmless treatment, and meanwhile, the resource utilization can be realized, and biogas, organic fertilizer and the like are produced, so that the method has important significance for clean energy consumption in areas, cyclic agricultural development, environmental improvement and the like.
The promotion of urban and rural construction causes the urban and rural areas to gradually show an integrated development trend, meanwhile, the construction land is used as a rare resource, the available amount is increasingly reduced, and how to comprehensively treat urban household garbage and livestock manure generated by agricultural cultivation becomes a social concern for solving the urban and rural environmental problems and reducing the outstanding contradiction of the use of the construction land.
Disclosure of Invention
The invention aims to solve the technical problem of providing a system and a preparation method for preparing biological natural gas by cooperatively treating kitchen waste and livestock and poultry manure, wherein the kitchen waste and the livestock and poultry manure can be treated simultaneously according to a certain proportion, the problem that the kitchen waste or the livestock and poultry manure with single town cannot meet the capacity of large anaerobic fermentation treatment is solved, and meanwhile, the system realizes the preparation of the biological natural gas and the preparation of organic fertilizer by biogas, so that the biogas generated by the system and the digestion liquid generated by the system can be utilized, and the maximization of economic benefit is realized.
In order to solve the technical problems, the technical scheme provided by the invention is that the system for preparing the biological natural gas by cooperatively treating kitchen waste and livestock and poultry manure comprises an anaerobic fermentation system, and is characterized in that a material pretreatment system is connected to a feeding end of the anaerobic fermentation system, and a biogas purifying and purifying system is connected to a biogas outlet end of the anaerobic fermentation system; the material pretreatment system comprises a kitchen waste pretreatment system and a mixing system for mixing with livestock manure; the biogas purification system comprises a steam-water separation system, a biogas desulfurization system and a carbon dioxide removal system which are connected in sequence; a supercharging device is arranged between the steam-water separation system and the methane desulfurization system; the biogas desulfurization system is a secondary desulfurization system; a pressure stabilizing device is respectively arranged between the biogas desulfurization system and the carbon dioxide removal system as well as between the biogas desulfurization system and each other gas utilization point; the digestion liquid discharge port after fermentation of the anaerobic fermentation system is connected with a solid-liquid separator, and biogas residues and biogas slurry after solid-liquid separation are respectively sent to a solid organic fertilizer preparation place and a liquid organic fertilizer preparation place; the biological sulfur mud after desulfurization of the biogas desulfurization system is used as an additive to be conveyed to a solid organic fertilizer preparation place.
The kitchen waste pretreatment system comprises a feeding bin, a pulping separator and an oil removal system which are connected in sequence; the bin is provided with a screw conveyor and a weighing and metering device, and is used for weighing kitchen wastes and conveying the kitchen wastes to the pulping separator; the pulping separator is used for crushing kitchen waste, removing foreign matters and preparing slurry; the oil removing system comprises a heating device and an oil removing device, and is used for heating the kitchen waste slurry and separating grease; and after grease separation by the oil removal system, the kitchen waste slurry is sent to a mixing system to be mixed with livestock and poultry manure.
And a flowmeter is arranged on a slurry discharging pipeline of the oil removing system.
The mixing system is a mixing bin, and the mixing bin is provided with a livestock and poultry manure inlet and a kitchen waste slurry inlet; a grid for removing massive foreign matters is arranged at the livestock and poultry manure inlet; a discharging spiral conveying device is arranged in the mixing bin, and a weighing and metering device is arranged at the bottom of the mixing bin; the discharging opening of the discharging spiral conveying device of the mixing bin is provided with a small foreign matter collecting and removing opening; and the mixed materials of the mixing bin are conveyed into the anaerobic fermentation system through a discharging spiral conveying device and a material pump.
The anaerobic fermentation system is a high-temperature dry anaerobic fermentation system or a medium-temperature wet anaerobic fermentation system; the high-temperature dry anaerobic fermentation system is a plug-flow anaerobic fermentation tank; the medium-temperature wet anaerobic fermentation system is a full mixed flow anaerobic fermentation tank; the top of the plug-flow anaerobic fermentation tank or the full mixed flow anaerobic fermentation tank is respectively provided with a double-film gas storage cabinet; the double-film gas storage cabinet comprises an inner film and an outer film; the top of the plug-flow anaerobic fermentation tank or the full mixed flow anaerobic fermentation tank is also provided with a positive and negative pressure protection device, and the positive and negative pressure protection device is communicated with the double-film gas storage tank to regulate the pressure of the double-film gas storage tank; when a high-temperature dry anaerobic fermentation system is adopted, the TS concentration of the mixed material of the kitchen waste and the livestock and poultry manure is required to be 20% -27%; when a medium-temperature wet anaerobic fermentation system is adopted, the TS concentration of the mixed material of the kitchen waste and the livestock and poultry manure is required to be 10-15%. .
The system is characterized in that a heating coil pipe for providing heat energy for fermentation is arranged on the plug-flow anaerobic fermentation tank or the full mixed flow anaerobic fermentation tank, a hot water supply end of the heating coil pipe is connected with a hot water boiler, and heating energy of the hot water boiler is methane after desulfurization by a methane desulfurization purification system.
And a flame arrester is arranged at the biogas outlet end of the anaerobic fermentation system.
The steam-water separation system comprises a condensate water tank, a heat exchanger and a steam-water separator which are sequentially connected, and the biogas is dehydrated through natural cooling, the heat exchanger and the steam-water separator in sequence; the supercharging device is arranged between the condensed water tank and the heat exchanger; the steam-water separator is communicated with the methane desulfurization system.
The secondary desulfurization system comprises a biological desulfurization system of a first stage and a dry desulfurization system of a second stage; and a steam-water separator is arranged between the first-stage desulfurization system and the second-stage desulfurization system.
The biological desulfurization system sequentially comprises an alkali type washing tower connected with the steam-water separation system, wherein an absorption liquid discharge pipe of the alkali type washing tower is communicated with the input end of a bioreactor, and the output end of regenerated alkali liquid of the bioreactor is communicated with an alkali liquid pool of the alkali type washing tower; and conveying the desulfurized biogas from the top of the basic washing tower to a second-stage desulfurization system.
The dry desulfurization system comprises at least two desulfurization packing towers which are arranged in parallel; the methane input pipeline of each desulfurization packing tower is respectively provided with the steam-water separator.
The desulfurized biogas pipeline is respectively connected with a pressure stabilizing tank at each gas utilization point, wherein one pressure stabilizing tank is communicated with the carbon dioxide removal system; the carbon dioxide removal system is membrane purification equipment, and biogas is obtained after passing through the membrane purification equipment; and a biogas emptying discharge pipe for fault maintenance is also arranged on the biogas pipeline purified by the desulfurization system.
The invention also provides a preparation method of the biological natural gas system by cooperatively treating the kitchen waste and the livestock and poultry manure, which comprises the following steps: 1) Pretreatment: before mixing, crushing kitchen waste, removing foreign matters, pulping and separating grease; removing stones from livestock and poultry manure; 2) Mixing the treated kitchen waste slurry and livestock and poultry manure, feeding the mixture into an anaerobic fermentation system for fermentation, and adjusting TS concentration of the mixed material; when the livestock and poultry manure is collected in a dry manure cleaning mode, the manure is mixed with kitchen waste, the concentration of the mixed material TS is regulated to 20% -27%, the mixed material TS enters a plug flow type anaerobic fermentation tank, the fermentation is carried out by a high-temperature dry anaerobic fermentation process, the temperature in the tank is 50-60 ℃, and the retention time is 30-40 d; when the livestock and poultry manure is collected in a water-based manure flushing mode, the manure is mixed with kitchen waste, the TS concentration of the mixed material is regulated to 10% -15%, the mixed material enters a full mixed flow anaerobic fermentation tank, the mixed material is fermented by a medium-temperature wet anaerobic fermentation process, the temperature in the tank is 30-40 ℃, and the retention time is 30-40 d; 3) Carrying out steam-water separation on methane generated by anaerobic fermentation, and carrying out methane desulfurization after pressurization; meanwhile, the digestive juice generated after anaerobic fermentation is subjected to solid-liquid separation, and then solid organic fertilizer and liquid organic fertilizer are prepared; 4) After the desulfurized biogas is stabilized, carbon dioxide in the biogas is removed through membrane purification to generate biological natural gas.
The biogas desulfurization in the step 3) is divided into a first-stage biological desulfurization and a second-stage dry desulfurization; performing steam-water separation after the first-stage biological desulfurization, and performing second-stage dry desulfurization; and taking sulfur mud generated by the first-stage biological desulfurization as an additive to prepare the solid organic fertilizer. .
The beneficial effects of the system of the invention are that:
1. the system can cooperatively treat kitchen waste and livestock and poultry manure to prepare the biological natural gas, anaerobic fermentation biogas slurry and biogas residues can be effectively utilized to produce the organic fertilizer, the whole system has no pollutant emission, and the recycling utilization of organic wastes is truly realized.
2. The system has wide raw material adaptability, the solid content of the excrement is acceptable within the range of 5% -28%, the inlet of the mixing bin is provided with a grid for removing massive foreign matters, the discharge end of the discharging screw conveyor of the mixing bin is provided with a broken stone collecting port and a cleaning port, and the broken stone in the excrement is conveniently removed to protect a rear-end material pump.
3. The kitchen waste treatment system has the functions of oil extraction and impurity removal, and is beneficial to the stable gas production process in the rear-end fermentation tank. The kitchen bin and the mixing bin are provided with a weighing metering system and a liquid level alarm control system, so that material overflow is prevented, and a fully-sealed discharging mode is adopted, so that odor emission is avoided. The kitchen bin and the mixing bin discharge port have metering functions, and are favorable for material proportioning adjustment and production metering.
4. The fire arrestor is arranged on the biogas outlet pipeline of the anaerobic fermentation tank, so that the overall safety of the anaerobic fermentation tank is ensured, the pipeline is provided with the flowmeter, biogas yield and accumulated yield data can be provided, and the condensate water is removed by the steam-water separator arranged in front of the flowmeter so as to ensure the accuracy of the flowmeter and the accuracy of the data.
5. The method saves land and energy and has high automation degree.
6. The condensed water tank is provided with a vent pipe and a liquid sealing device, so that the pressure balance in the tank is ensured, and biogas is not carried into the tank body; the condensed water tank is provided with a liquid level sensor which is interlocked with the overflow port and the cleaning port of the tank body, so that the stable range of the height of the liquid seal in the tank is ensured.
7. The secondary desulfurization mode is adopted, the desulfurization efficiency is improved, the operation intensity of dry desulfurization is reduced, and sulfur mud enters a solid organic fertilizer production system and cannot cause environmental pollution.
8. The biogas secondary desulfurization process adopts a mode of pressurizing before desulfurizing, so that the service life of the desulfurizing agent in the dry desulfurization is prolonged. Biological desulfurization is more suitable for biogas engineering which takes livestock and poultry manure as raw material. After desulfurization, the biogas is sent to each gas utilization point through the pressure stabilizing tank, so that the pressure stability of the gas utilization point at the rear end is ensured, and the shutdown caused by unstable pressure is avoided.
Drawings
FIG. 1 is a schematic diagram of the overall process flow of high temperature dry anaerobic fermentation.
FIG. 2 is a schematic diagram of the overall process flow of medium temperature wet anaerobic fermentation.
FIG. 3 is a schematic diagram of a dry anaerobic fermentor.
FIG. 4 is a schematic diagram of a wet anaerobic fermentation tank.
FIG. 5 is a schematic flow chart of a biogas purification system.
FIG. 6 is a schematic flow diagram of a dry desulfurization and pressure stabilization system.
Detailed Description
The present invention will now be described in more detail with reference to the preferred embodiments thereof as illustrated in the accompanying drawings. The system mainly comprises a pretreatment system for kitchen waste and livestock and poultry manure, an anaerobic fermentation system, a biogas desulfurization purification system and an organic fertilizer manufacturing system.
Referring to fig. 1 and 2, the pretreatment system for kitchen waste and livestock and poultry manure specifically comprises a kitchen waste bin 1, a pulping separator 2, a heating device 3, an oil removing device 4 and a mixing bin 5 for mixing the kitchen waste and the livestock and poultry manure. The kitchen garbage feed bin 1 is funnel-shaped structure, has openable sealed lid, guarantees that the stink can not overflow from the feed bin, is favorable to environmental protection. A liquid level alarm control device (not shown) is provided in the bin 1 to prevent the waste in the bin from overflowing to the outside. The screw conveyer 101 is arranged at the bottom of the storage bin, the screw conveyer and the periphery of the storage bin are of a full-sealing structure, and the odor leakage in the storage bin is reduced to the greatest extent through the storage bin sealing cover and the screw conveyer with the full-sealing bottom of the storage bin. The bottom of the screw conveyor of the bin is also provided with a weighing and metering device (not shown) which can weigh the kitchen waste in the kitchen waste bin for each feeding. Kitchen waste in the bin 1 is sent out of the bin through a screw conveyor, and then is sent to the pulping separator 2 through a material pump. The pulping separator has the functions of crushing, impurity removal and pulping, and can separate some foreign matters in kitchen waste, such as plastics, fruit pits and the like, and convey the foreign matters to a garbage collection bin outside the pulping separator. The kitchen waste is crushed and pulped to prepare kitchen waste slurry while the sundries are separated. The oil removing system comprises a slurry heating device 3 and an oil removing device 4, and kitchen waste slurry prepared in the pulping separator is pumped into the heating device 3 through a pipeline to heat the kitchen waste slurry. The heating temperature is 60-70 ℃, which is favorable for melting the blocky grease in the slurry and for the oil removal operation at the rear end. The heated kitchen waste slurry is sent to an oil removing device 4 for oil separation, the oil removing device 4 adopts centrifugation to separate out oil, and the separated and collected oil is sold or reprocessed. The slurry degreased by the degreasing system is pumped into the mixing bin 5 through a pipeline. A flowmeter (not shown) is arranged on a conveying pipeline from the oil removing system to the mixing bin, so that the discharge amount of the kitchen waste slurry in the mixing bin can be accurately metered, and the kitchen waste slurry can be mixed with livestock and poultry sewage according to the proportion.
The mixing bin 5 is of a funnel-shaped structure, and is provided with a livestock and poultry manure inlet and a kitchen waste slurry inlet. A grid (not shown) for removing foreign matters such as stones in the livestock and poultry manure is arranged at the livestock and poultry manure inlet. The mixing bin is internally provided with a liquid level alarm control device for preventing overflow, a screw conveyer 501 arranged at the bottom of the mixing bin and used for conveying materials and a weighing metering device. The screw conveyer discharge port of mixing bunker ejection of compact department is equipped with rubble and collects and clear up the mouth to prevent that rubble in the mixed material from causing the harm to the material pump. And after the livestock and poultry manure and the kitchen waste slurry are proportioned in the mixing bin, the livestock and poultry manure and the kitchen waste slurry are pumped into an anaerobic fermentation system through a discharge screw conveyor and a material pump for anaerobic fermentation.
The anaerobic fermentation system comprises an anaerobic fermentation tank 6, a fan 7 and a positive and negative pressure protector 8 which are arranged on the anaerobic fermentation tank. A temperature sensor, a liquid level sensor, and a pressure sensor (not shown) are provided in the anaerobic fermentation tank. The temperature sensor is interlocked with the anaerobic fermentation tank heat preservation equipment to control the operation temperature of the anaerobic fermentation tank; the liquid level sensor can acquire the actual volume of the materials in the anaerobic fermentation tank, so that the feeding amount of the anaerobic fermentation tank is adjusted; the pressure sensor controls the pressure in the anaerobic fermentation tank. The anaerobic fermentation tank is provided with a hot water device for providing heat energy. The water heating means is a heating coil 61 arranged in the anaerobic fermentation tank. The heating coil 61 is provided with a hot water supply end and a hot water return end, hot water of the hot water supply end in the heating coil is from hot water generated by a boiler, and heating energy of the boiler is methane after desulfurization of the system, so that energy recycling is realized, additional heating heat energy is saved, and the system operation cost is reduced.
Referring to fig. 3 and 4, fig. 3 is a schematic diagram of a dry anaerobic fermentation tank, and fig. 4 is a schematic diagram of a wet anaerobic fermentation tank. In fig. 3, a double-film gas holder is arranged at the top of the anaerobic fermentation tank to save occupied space, a film 611 and an outer film 610 are arranged in the double-film gas holder, a pressure-regulating air pipe orifice 608 is arranged on the outer film, a small amount of air is filled in the gas holder through the pressure-regulating air pipe orifice 608 by the pressure-regulating fan 7, the air quantity between the two films is regulated through a control system, the operation pressure of the gas holder is stabilized, and the shape of the outer film is maintained to be attractive. The inner membrane is connected with the anaerobic fermentation tank, and the pressure sensor is interlocked with the positive and negative pressure protector 8 to play a role in state monitoring and safety guarantee. The stirring device is arranged in the fermentation tank and comprises stirring shafts 603 penetrating through tank walls on two sides of the fermentation tank, paddles 604 arranged on the stirring shafts, and a stirring motor 602 which is arranged outside the fermentation tank and is used for providing power, and materials are stirred and mixed through the stirring device. A feed port 605 and a flushing port 606 are provided in the fermenter wall 601 for feeding and flushing the fermenter. The wall of the fermentation tank is also provided with a methane outlet 609, and the methane outlet 609 is provided with a flame arrester (not shown), so that the overall safety of the anaerobic fermentation tank is ensured. A discharge port 612 is also provided in the wall of the fermenter for discharging the digestive juice after fermentation.
In fig. 4, the main difference from the structure of the dry anaerobic fermentation tank of fig. 3 is that the stirring device 620 is provided in the wall of the fermentation tank.
After fermentation by the anaerobic fermentation system, the obtained biogas is conveyed into a biogas purifying and purifying system 9 through a pipeline for biogas purification, and biological natural gas output is generated.
Referring to fig. 5, the biogas purifying and purifying system 9 comprises a steam-water separation system device, a biogas desulfurization system and a carbon dioxide removal system. The steam-water separation system sequentially comprises a condensate water tank 901, a booster fan 902, a plate heat exchanger 903 and a steam-water separator 904 which are connected.
The biogas exiting the anaerobic fermentation tank is at about 55 ℃ and carries a large amount of saturated water. Before the desulfurization of the biogas, a large amount of saturated water in the biogas needs to be removed. Firstly, methane coming out of an anaerobic fermentation tank is communicated with a vent pipe in a condensate water tank 901 through a gas pipe with a certain gradient at the low point of the gas pipe, natural cooling is performed through the gas pipe, part of saturated water in the methane is condensed into water, the water is led to the condensate water tank along the low point of the gas pipe for collection, and meanwhile, the methane is naturally cooled to about 45 ℃. The condensed water tank is provided with a liquid sealing device, so that the pressure balance in the tank is ensured, and biogas is not carried into the tank body; the condensed water tank is provided with a liquid level sensor which is interlocked with the overflow port and the cleaning port of the tank body, so that the stable range of the height of the liquid seal in the tank is ensured. The methane subjected to preliminary cooling and dehydration enters the plate heat exchanger 903 through the booster fan 902. The temperature is reduced by heat exchange of the plate heat exchanger, and after residual saturated water in the methane is separated out, the water in the methane is removed by steam-water separation through the steam-water separator 904. And the biogas at the outlet end of the plate heat exchanger is cooled to about 30 ℃ and saturated water is removed at the same time, so that the requirements of the desulfurization inlet temperature and the moisture are met. After the biogas passes through the steam-water separator 904, a flowmeter (not shown) is arranged on a pipeline which does not enter the biogas biological desulfurization system, the flowmeter can provide biogas yield and accumulated yield data, and after the flowmeter is arranged in the steam-water separator, saturated water in the biogas is removed, so that the accuracy of the flowmeter and the accuracy of the data are ensured.
Biogas typically contains hydrogen sulfide, which can be removed by desulfurization. The biogas desulfurization system is a secondary desulfurization system, the first stage is a biological desulfurization system, and the second stage is a dry desulfurization system, so that desulfurization efficiency can be improved and the service life of the dry desulfurization system can be prolonged through two-stage desulfurization.
The first stage biological desulfurization system mainly comprises a basic washer 905 and a bioreactor 906. After pressurization, the marsh gas with water removed by the steam-water separator enters the basic washing tower, alkali liquor is sprayed downwards from the upper part of the basic washing tower, and the marsh gas passes through the sprayed alkali liquor upwards from the bottom of the basic washing tower and is output to a dry desulfurization system from the top of the basic washing tower; and the absorption liquid after desulfurization by contact with methane is conveyed to a bioreactor from the bottom of the basic washing tower for desulfurization and regeneration, and the regenerated alkali liquid flows back to the basic washing tower from the bioreactor for methane desulfurization operation. Dehydrated methaneThe mixture is sent into a basic washing tower after being boosted by a booster fan 902, and alkali liquor of the basic washing tower adopts sodium carbonate or sodium hydroxide aqueous solution as washing liquid, and H is arranged in the basic washing tower 2 S reacts with the sprayed alkali liquor to remove part of hydrogen sulfide in the methane from the methane. The scrubbed biogas is discharged from the top of the scrubber and enters a second-stage dry desulfurization system 907. The absorption liquid of the washing tower flows to the bottom of the tower and enters the bioreactor 906, an air distribution system is arranged at the bottom of the bioreactor, and oxygen is provided for microorganisms through the air distribution system so as to convert sulfide in the absorption liquid entering the bioreactor through the washing tower into elemental sulfur, and meanwhile, the alkali liquid after being washed with methane is regenerated through biological reaction. Recycling regenerated alkali liquor from the bioreactor to the washing tower to remove H contained in the biogas 2 S gas realizes the recycling of the alkali liquor of the washing tower. The sulfur mud produced by the bioreactor can be sent into an organic fertilizer production system to be used as an additive for adjusting the nutrition components of the organic fertilizer. The first-stage biological desulfurization system is more suitable for biological natural gas engineering taking kitchen waste and livestock and poultry manure as raw materials. The sulfur content in the biogas is reduced through the desulfurization of the first-stage biological desulfurization system, and then the biogas enters the second-stage dry desulfurization system to continue desulfurization, so that the desulfurization burden of the second-stage dry desulfurization system can be reduced.
The second stage dry desulfurization system 907 includes at least two dry desulfurization towers 907-2 arranged in parallel. A steam-water separator 907-1 is arranged on the pipeline at the biogas input front end of each dry desulfurizing tower. The moisture carried in from the biological desulfurization system is removed by a steam-water separator.
The biogas passing through the first-stage biological desulfurization system passes through a steam-water separator 907-1 and then enters a dry desulfurization tower 907-2 for further desulfurization, see fig. 6. The dry desulfurizing tower is a desulfurizing filler tower, and the filler layer is Fe 2 O 3 . After the water in the methane is removed by the steam-water separator, the methane enters from the bottom of the packing tower, and is discharged from the upper end of the packing tower after desulfurization by the packing layer. The main purpose of the desulfurization packing tower is to make H in methane 2 S and Fe of filler layer in desulfurization filler tower 2 O 3 React to generate Fe 2 S 3 Realize the desulfurization of methane. After the desulfurization operation is finished, fe 2 O 3 After the reaction is finished, the filler layer can be regenerated to ensure that Fe 2 O 3 The filler layer can be regenerated and reused. The desulfurization packing towers 907 can be connected in parallel to form a plurality of groups, so that the desulfurization efficiency is improved. Since the desulfurization filler tower cannot perform desulfurization operation when the filler is regenerated, at least two groups of dry desulfurization towers must be provided in dry desulfurization, and the other dry desulfurization tower can continue to operate when the filler is regenerated. But in doing so, the desulfurization efficiency is made relatively low. The biological desulfurization is carried out before the dry desulfurization, so that the sulfur content in the biogas is reduced, and the sulfur content absorbed by the filler is correspondingly reduced during the dry desulfurization, so that the service time of the filler of the dry desulfurization tower is prolonged, and the desulfurization efficiency is improved.
The biological desulfurization technology has high treatment capacity and high automation degree, and is more suitable for preparing a biological natural gas system by taking kitchen waste and livestock and poultry manure as raw materials; the dry desulfurization technology adopts a pre-desulfurization pressurizing technology, so that negative pressure can be prevented from being formed in a desulfurization tower, and the service life of a desulfurizing agent is prolonged; the dry desulfurization system is used as a fine desulfurization auxiliary measure for biological desulfurization, so that the replacement frequency of the desulfurizing agent is reduced, and the operation cost is reduced.
Part of the biogas after further desulfurization by the dry desulfurization system is used for providing heat energy for a boiler through a pressure stabilizing tank 909, and the boiler can be used for providing hot water circulation for the anaerobic fermentation system. A portion passes through surge tank 909 and then enters the carbon dioxide removal system to remove carbon dioxide from the biogas. The carbon dioxide removal system is a membrane purification device 908 for further purifying the biogas. And removing carbon dioxide gas in the desulfurized biogas by utilizing the selective permeability of the membrane to obtain methane-rich gas, namely the biological natural gas. And a blow-down pipe is arranged at the top of each dry desulfurization tower, methane in the towers is led to the safety zone to be dispersed at high altitude during maintenance, and when the rear end gas utilization point fails, the methane from the desulfurization towers and the methane from the corresponding pressure stabilizing tanks are connected to a torch for combustion, so that the safety of the production environment is ensured.
The pressure stabilizing tank can store 10 seconds of marsh gas consumption according to the gas consumption of the rear end, and the pressure stabilizing tank can ensure the marsh gas pressure of the boiler system to be stable when the membrane purification system is started because the marsh gas pressure of the membrane purification system and the marsh gas pressure of the boiler system are large, so that flameout of the boiler system is avoided, and meanwhile, the membrane purification system is ensured to be stable in operation.
The digestive juice fermented by the anaerobic fermentation system enters the solid-liquid separation equipment 10 for solid-liquid separation. And (3) taking part of the liquid separated by the solid-liquid separation equipment as reflux liquid to enter an anaerobic fermentation system, and taking the rest part of biogas slurry to enter a liquid organic fertilizer production system to produce liquid organic fertilizer. The liquid organic fertilizer production process comprises the steps of biogas slurry aging, acidification treatment, flocculation precipitation, centrifugal separation, complex complexing, superfine filtration and filling to form the final liquid organic fertilizer for sale.
And (3) the biogas residues separated by the solid-liquid separation equipment enter a solid fertilizer production system to produce solid organic fertilizer. The production process of the solid organic fertilizer generally comprises the steps of mixing biogas residues with straws, mushroom residues or peanut shells and livestock and poultry manure, performing aerobic fermentation for 10-15 days, composting for about 7 days, and performing batching, crushing, screening, granulating, drying, cooling, adding bacteria, coating and packaging to produce the solid organic fertilizer for sale finally.
The method for preparing the biological natural gas by the treatment system comprises the following steps:
example 1
Pouring 100t kitchen waste with the solid content of 15% into a kitchen waste bin, and metering the kitchen waste by a weighing metering device; and conveying the kitchen waste to pulping separation machine for pulping through a screw conveyor arranged at the outlet of the storage bin. The kitchen waste is subjected to foreign matter separation (such as plastics, fruit pits, bones and the like) through the pulping separator, the kitchen waste after foreign matter separation is crushed for pulping, and then the kitchen waste slurry is sent into a deoiling system by a pump for heating and deoiling. Heating the materials to 60-70 ℃, and separating grease in the slurry by a centrifugal separation device. And pumping the residual kitchen waste slurry after oil removal to a mixing bin to be mixed with livestock and poultry manure. The slurry output from the oil removal system is metered by a flowmeter, and the discharge amount is recorded so as to accurately mix materials in the mixing bin.
And (3) feeding 950t of a mixture of chicken manure and pig manure with a solid content of 25% into a mixing bin, and arranging a grid at a feed inlet of the mixing bin to remove large-particle-size solid impurities in the livestock manure. Mixing with kitchen slurry, regulating TS concentration to 24%, regulating C/N ratio to 22, outputting the mixture to a mixing bin by a discharging screw conveyor, and fermenting in a material pumping anaerobic fermentation system. The anaerobic fermentation system in this embodiment is a plug-flow anaerobic fermentation tank, i.e. a dry anaerobic fermentation. The mixed material is heated and kept at 55+/-0.5 ℃ in hot water generated by a boiler in a fermentation tank, the materials in the fermentation tank are fully stirred by a stirring device, the hydraulic retention time is 33 days, and anaerobic fermentation is carried out to generate methane. The anaerobic fermentation process needs to monitor the operation temperature, the pressure of the gas storage film and the like in real time. And carrying out timing detection on related operation parameters, such as TS concentration of materials in the tank, VS concentration of organic matters, content of volatile fatty acids, biogas components and the like, every day. And feeding and discharging the fermentation tank every day, when the concentration in the tank is too high, refluxing with biogas slurry to adjust the concentration in the tank, adding a mixed material when the concentration in the tank is too low, and adjusting the operation condition according to the monitoring parameters so as to ensure that the anaerobic fermentation tank is in an optimal fermentation state. By adjusting the fermentation state, the methane content in the biogas generated by taking kitchen waste and livestock and poultry manure as raw materials in the method is ensured to be more than 55 percent.
After natural cooling, methane generated by the fermentation tank enters a plate heat exchanger through a booster fan to be subjected to heat exchange cooling, the temperature is reduced from 55 ℃ to 30 ℃, and part of water vapor in the methane is collected by a condensation water tank while the temperature is reduced, and part of the water vapor is condensed and separated by a vapor-water separator, so that methane dehydration is realized. The dehydrated marsh gas passes through a biological desulfurization system, and H in the marsh gas is obtained after alkali liquor is washed and desulfurized through an alkali liquor washing and desulfurizing device and a bioreactor for regenerating alkali liquor 2 The S content is reduced from 1000ppm to 100ppm. The biogas desulfurized by the biological desulfurization system passes through a steam-water separator, the biogas after the moisture substituted by the biological desulfurization system is separated enters a dry desulfurization system for desulfurization, and H in the biogas passes through 2 S reacts with filler in a dry desulfurization system to lead H in methane 2 S content is reduced to below 10ppm, and methane desulfurization is realized. The desulfurized biogas enters different pressure stabilizing tanks respectively, wherein the biogas in one pressure stabilizing tank is directly conveyed into a boiler room to provide heat energy for a boiler; part of the water enters the surge tank and then is sent into a membrane purification deviceAnd (3) preparing the natural gas by purifying and removing carbon dioxide. The biological natural gas of the product meets the standard of natural gas (GB 17820-2018).
After the solid-liquid separation of the digestion liquid discharged from the fermentation tank, the solid content of the biogas residue is 25%, the solid content of the biogas liquid is 5%, and the biogas residue is subjected to aerobic composting to produce the solid organic fertilizer. And (3) refluxing a part of biogas slurry to adjust the concentration of materials in the fermentation tank, feeding the rest part of biogas slurry into an organic fertilizer production system, aging and acidizing, flocculating, centrifuging, complexing, and carrying out superfine filtration to produce the liquid organic fertilizer. The liquid organic fertilizer meets the standard of compound microbial fertilizer (NY/T798-2015).
Example 2 of the embodiment
Pouring 180t of kitchen waste with the solid content of 15% into a kitchen bin, and metering the kitchen waste by a weighing metering device; and conveying the kitchen waste to pulping separation machine for pulping through a screw conveyor arranged at the outlet of the storage bin. The kitchen waste is subjected to foreign matter separation (such as plastics, fruit pits, bones and the like) through the pulping separator, the kitchen waste after foreign matter separation is crushed for pulping, and then the kitchen waste slurry is sent into a deoiling system by a pump for heating and deoiling. Heating the materials to 60-70 ℃, and separating grease in the slurry by a centrifugal separation device. Pumping the residual kitchen waste slurry after degreasing to a mixing bin to be mixed with livestock and poultry manure; pouring 600t of livestock and poultry manure mixture with the solid content of 10 percent into a mixing bin, mixing the mixture with kitchen slurry until the TS concentration is 11.2 percent, and pumping the mixture and the materials into a full mixed flow anaerobic fermentation tank in a C/N ratio of 25. The materials are heated and kept at 38+/-0.5 ℃ by hot water in a fermentation tank, the materials in the fermentation tank are fully stirred by a stirrer, the hydraulic retention time is 30d, and anaerobic fermentation is carried out to produce methane. The anaerobic fermentation process needs to monitor the operation temperature, the pressure of the gas storage film and the like in real time. And carrying out timing detection on related operation parameters, such as TS concentration of materials in the tank, VS concentration of organic matters, content of volatile fatty acids, biogas components and the like, every day. And feeding and discharging the fermentation tank every day, when the concentration in the tank is too high, refluxing with biogas slurry to adjust the concentration in the tank, adding a mixed material when the concentration in the tank is too low, and adjusting the operation condition according to the monitoring parameters so as to ensure that the anaerobic fermentation tank is in an optimal fermentation state. By adjusting the fermentation state, the methane content in the biogas generated by the biological natural gas engineering taking kitchen waste and livestock and poultry manure as raw materials in the method is ensured to be more than 55 percent.
Saturated water separated out from methane generated by the fermentation tank through natural cooling is collected into a condensate tank, the temperature of the methane is reduced from 38 ℃ to 28 ℃ after the methane enters a plate heat exchanger through a booster fan for heat exchange cooling, and water separated out in the cooling process is condensed and separated through a steam-water separator, so that methane dehydration is realized. The dehydrated marsh gas passes through a biological desulfurization system, and H in the marsh gas is obtained after alkali liquor is washed and desulfurized through an alkali liquor washing and desulfurizing device and a bioreactor for regenerating alkali liquor 2 The S content is reduced from 1000ppm to 100ppm. The biogas desulfurized by the biological desulfurization system passes through a steam-water separator, the water substituted by the biological desulfurization system is separated, and the biogas enters a dry desulfurization system for desulfurization, and H in the biogas passes through 2 S reacts with filler in a dry desulfurization system to lead H in methane 2 S content is reduced to below 10ppm, and methane desulfurization is realized. The desulfurized biogas enters different pressure stabilizing tanks respectively, wherein the biogas in one pressure stabilizing tank is directly conveyed into a boiler room to provide heat energy for a boiler; and (3) feeding a part of the natural gas into a pressure stabilizing tank, and then feeding the natural gas into membrane purification equipment, and purifying to remove carbon dioxide to generate the biological natural gas. The biological natural gas of the product meets the standard of natural gas (GB 17820-2018).
After the solid-liquid separation of the digestion liquid discharged from the anaerobic fermentation tank, the solid content of the biogas residue is 25%, the solid content of the biogas liquid is 5%, and the biogas residue is subjected to aerobic composting to produce the solid organic fertilizer. And (3) refluxing a part of biogas slurry to adjust the concentration of materials in the fermentation tank, feeding the rest part of biogas slurry into an organic fertilizer production system, aging and acidizing, flocculating, centrifuging, complexing, and carrying out superfine filtration to produce the liquid organic fertilizer. The liquid organic fertilizer meets the standard of compound microbial fertilizer (NY/T798-2015).
The two embodiments are two anaerobic fermentation processes of the system. In the first fermentation process, when the livestock and poultry manure is manure collected in a dry manure cleaning mode, the solid content of kitchen waste is 15% -20%, and the TS concentration of the material is adjusted to 20% -27% after the materials are mixed, the material enters a plug flow type anaerobic fermentation tank for fermentation, the temperature in the tank is 50 ℃ -60 ℃ and the retention time is 30 d-40 d, and the process is a high-temperature dry anaerobic fermentation process. The second fermentation process is to mix and adjust the TS concentration of the materials to 10% -15% after adding process water into the materials, and then enter a fully mixed flow anaerobic fermentation tank, wherein the temperature in the tank is 30-40 ℃ and the retention time is 30-40 d, and the process is a medium temperature wet anaerobic fermentation process. From this, the anaerobic fermentation process selected by the system is determined by the TS concentration of the mixed material.
Claims (5)
1. A system for preparing biological natural gas by cooperatively treating kitchen waste and livestock and poultry manure comprises an anaerobic fermentation system, and is characterized in that a material pretreatment system is connected to the feed end of the anaerobic fermentation system, and a biogas purification system is connected to the biogas outlet end of the anaerobic fermentation system; the material pretreatment system comprises a kitchen waste pretreatment system and a mixing system for mixing with livestock manure; the biogas purification system comprises a steam-water separation system, a biogas desulfurization system and a carbon dioxide removal system which are connected in sequence; a supercharging device is arranged between the steam-water separation system and the methane desulfurization system; the biogas desulfurization system is a secondary desulfurization system, and the secondary desulfurization system comprises a first-stage biological desulfurization system and a second-stage dry desulfurization system; pressure stabilizing devices are arranged between the biogas desulfurization system and the carbon dioxide removal system and between the biogas desulfurization system and each other gas utilization point; the digestion liquid discharge port after fermentation of the anaerobic fermentation system is connected with a solid-liquid separator, and biogas residues and biogas slurry after solid-liquid separation are respectively sent to a solid organic fertilizer preparation place and a liquid organic fertilizer preparation place; the biological sulfur mud after desulfurization of the biogas desulfurization system is used as an additive to be conveyed to a solid organic fertilizer preparation place; wherein:
the kitchen waste pretreatment system comprises a feeding bin, a pulping separator and an oil removal system which are sequentially connected; the feeding bin is provided with a screw conveyor and a weighing and metering device, and is used for weighing kitchen wastes and conveying the kitchen wastes to the pulping separator; the pulping separator is used for crushing kitchen waste, removing foreign matters and preparing kitchen waste slurry; the oil removing system comprises a heating device and an oil removing device, the kitchen waste slurry is heated and grease is separated, and the heating temperature of the heating device is 60-70 ℃; the kitchen waste slurry after oil and fat separation by the oil removal system is sent to a mixing system to be mixed with livestock and poultry manure;
the mixing system is a mixing bin, and the mixing bin is provided with a livestock and poultry manure inlet and a kitchen waste slurry inlet; a grid for removing massive foreign matters is arranged at the livestock and poultry manure inlet; a discharging spiral conveying device is arranged in the mixing bin, and a weighing and metering device is arranged at the bottom of the mixing bin; the discharge port of the discharging spiral conveying device of the mixing bin is provided with a small foreign matter collecting and removing port; the mixed materials of the mixing bin are conveyed into an anaerobic fermentation system through a discharging spiral conveying device and a material pump;
a fire arrestor is arranged at the biogas outlet end of the anaerobic fermentation system; the anaerobic fermentation system is a high-temperature dry anaerobic fermentation system or a medium-temperature wet anaerobic fermentation system; the high-temperature dry anaerobic fermentation system is a plug-flow anaerobic fermentation tank; the medium-temperature wet anaerobic fermentation system is a full mixed flow anaerobic fermentation tank; the tops of the plug-flow anaerobic fermentation tank and the full mixed flow anaerobic fermentation tank are respectively provided with a double-film gas storage cabinet; the double-film gas storage cabinet comprises an inner film and an outer film; the tops of the plug-flow anaerobic fermentation tank and the full mixed flow anaerobic fermentation tank are also provided with a positive and negative pressure protection device, and the positive and negative pressure protection device is communicated with the double-film gas storage tank to regulate the pressure of the double-film gas storage tank; a temperature sensor, a liquid level sensor and a pressure sensor are arranged in the plug-flow anaerobic fermentation tank and the full mixed flow anaerobic fermentation tank; when a high-temperature dry anaerobic fermentation system is adopted, the TS concentration of the mixed material of the kitchen waste and the livestock and poultry manure is required to be 20% -27%; when a medium-temperature wet anaerobic fermentation system is adopted, the TS concentration of the mixed material of the kitchen waste and the livestock and poultry manure is 10% -15%;
the system comprises a plug-flow anaerobic fermentation tank, a full mixed flow anaerobic fermentation tank, a hot water supply end, a hot water boiler and a biogas purification system, wherein heating coils for providing heat energy for fermentation are arranged on the plug-flow anaerobic fermentation tank and the full mixed flow anaerobic fermentation tank;
the steam-water separation system comprises a condensate water tank, a heat exchanger and a steam-water separator which are sequentially connected, and the biogas is dehydrated through natural cooling, the heat exchanger and the steam-water separator in sequence; the supercharging device is arranged between the condensed water tank and the heat exchanger; the steam-water separator is communicated with the methane desulfurization system; the supercharging device is a supercharging fan, and methane subjected to preliminary cooling and dehydration enters the heat exchanger through the supercharging fan; the condensed water tank is provided with a liquid sealing device, the condensed water tank is also provided with a liquid level sensor, and the liquid level sensor arranged on the condensed water tank is interlocked with an overflow port and a drain port of the condensed water tank body; a flowmeter is arranged on a pipeline before the biogas does not enter the biological desulfurization system after passing through a steam-water separator in the steam-water separation system;
a steam-water separator is arranged between the biological desulfurization system of the first stage and the dry desulfurization system of the second stage;
the biological desulfurization system sequentially comprises a basic washing tower connected with the steam-water separation system, and dehydrated biogas is fed into the basic washing tower after being boosted by a booster fan; the absorption liquid discharge pipe of the basic washing tower is communicated with the input end of the bioreactor, and the output end of the regenerated alkali liquid of the bioreactor is communicated with the alkali liquid pool of the basic washing tower; delivering the biogas after desulfurization by the biological desulfurization system from the top of the basic washing tower to a second-stage dry desulfurization system;
the pressure stabilizing device is a pressure stabilizing tank, the biogas pipeline desulfurized by the dry desulfurization system is respectively connected with the pressure stabilizing tank at each gas utilization point, and the carbon dioxide removing system is communicated with a pressure stabilizing tank; the carbon dioxide removal system is membrane purification equipment, and biogas is obtained after passing through the membrane purification equipment; and a biogas emptying discharge pipe for fault maintenance is also arranged on the biogas pipeline purified by the dry desulfurization system.
2. The system for preparing the biological natural gas by cooperatively treating the kitchen waste and the livestock and poultry manure according to claim 1, which is characterized in that a flow meter is arranged on a slurry discharging pipeline of the oil removing system.
3. The system for preparing the biological natural gas by cooperatively treating the kitchen waste and the livestock and poultry manure according to claim 1, which is characterized in that the dry desulfurization system comprises at least two desulfurization packed towers which are arranged in parallel; and a steam-water separator is respectively arranged on the biogas input pipeline of each desulfurization packing tower.
4. A method for preparing a biological natural gas system by cooperatively treating kitchen waste and livestock and poultry manure according to any one of claims 1 to 3, comprising the following steps: 1) Pretreatment: before mixing, crushing kitchen waste, removing foreign matters, pulping and separating grease; removing stones from livestock and poultry manure; 2) Mixing the treated kitchen waste slurry and livestock and poultry manure, feeding the mixture into an anaerobic fermentation system for fermentation, and adjusting TS concentration of the mixed material; when the livestock and poultry manure is collected in a dry manure cleaning mode, mixing the livestock and poultry manure with kitchen waste slurry, regulating the concentration of a mixed material TS to 20% -27%, entering a plug flow type anaerobic fermentation tank, and fermenting by a high-temperature dry anaerobic fermentation process, wherein the temperature in the tank is 50 ℃ -60 ℃ and the residence time is 30 d-40 d; when the livestock and poultry manure is collected in a water-based manure flushing mode, mixing the livestock and poultry manure with kitchen waste slurry, regulating the TS concentration of the mixed material to 10% -15%, and entering a full mixed flow anaerobic fermentation tank, wherein the temperature in the tank is 30 ℃ -40 ℃ and the residence time is 30-40 d; 3) Carrying out steam-water separation on methane generated by anaerobic fermentation, and carrying out methane desulfurization after pressurization; meanwhile, the digestive juice generated after anaerobic fermentation is subjected to solid-liquid separation, and then solid organic fertilizer and liquid organic fertilizer are prepared; 4) After the desulfurized biogas is stabilized, carbon dioxide in the biogas is removed by membrane purification equipment to generate biological natural gas.
5. The method for preparing the biological natural gas system by cooperatively treating kitchen waste and livestock and poultry manure according to claim 4, which is characterized in that the biogas desulfurization in the step 3) is divided into a first-stage biological desulfurization and a second-stage dry desulfurization; performing steam-water separation after the first-stage biological desulfurization, and performing second-stage dry desulfurization; and taking sulfur mud generated by the first-stage biological desulfurization as an additive to prepare the solid organic fertilizer.
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| CN113073042B (en) * | 2021-03-22 | 2022-08-30 | 武汉理工大学 | Integrated livestock and poultry manure-straw cooperative treatment device based on dry fermentation |
| CN114149159A (en) * | 2021-12-17 | 2022-03-08 | 黑龙江省能源环境研究院 | Livestock and poultry manure anaerobic fermentation device and use method thereof |
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