CN203668384U - Gas storage device of biogas power generation and burning utilization system - Google Patents

Gas storage device of biogas power generation and burning utilization system Download PDF

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Publication number
CN203668384U
CN203668384U CN201320731258.XU CN201320731258U CN203668384U CN 203668384 U CN203668384 U CN 203668384U CN 201320731258 U CN201320731258 U CN 201320731258U CN 203668384 U CN203668384 U CN 203668384U
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China
Prior art keywords
storage tank
expansion box
water tank
biogas
water
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Expired - Fee Related
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CN201320731258.XU
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Chinese (zh)
Inventor
陈开碇
王春晓
张圆
关树义
徐洪阁
王恩胜
贺建彪
李俊峰
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Henan Sundar Energy Source Environment Protection Co Ltd
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Henan Sundar Energy Source Environment Protection Co Ltd
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Priority to CN201320731258.XU priority Critical patent/CN203668384U/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/20Sludge processing
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/30Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37Wastewater or sewage treatment systems using renewable energies using solar energy

Abstract

A gas storage device of a biogas power generation and burning utilization system comprises a water storage tank with an open top and a gas storage tank with an open bottom, wherein the water storage tank and the gas storage tank are both cylindrical; the external diameter of the gas storage tank is smaller than the internal diameter of the water storage tank; water is contained in the water storage tank; the gas storage tank is placed in the water, with the opening of the gas storage tank facing down; a gas outlet pipe and a pressure sensor are arranged at the top of the gas storage tank; a gas inlet pipe extending into the top of the gas storage tank is arranged at the bottom of the water storage tank; a baffle plate is arranged at the upper part of the inner wall of the water storage tank; a limiting plate vertically corresponding to the baffle plate is arranged at the lower part of the outer wall of the gas storage tank; inclined struts for fixing the gas inlet pipe are arranged at the bottom inside of the water storage tank. The gas storage device is reasonable in design and simple in structure, stores biogas with better gas tightness, avoids biogas leakage, and is high in practicability and easy to popularize and apply; biogas is used for power generation, combustion heating and the like.

Description

Marsh gas power generation, burning utilize the accumulator unit of system
Technical field
The utility model belongs to biogas utilization technical field, relates in particular to a kind of marsh gas power generation, burns and utilize the accumulator unit of system.
Background technology
Biogas be organic substance under anaerobic, a kind of mixed gas generating through the fermentative action of microorganism.Because this gas is swampy at first, so be called biogas.The various organism such as human and animal excreta, stalk, sewage in airtight methane-generating pit, at anaerobism (there is no oxygen) condition bottom fermentation, the methane fermentating microorganism decomposition and inversion that class is various, thereby produce biogas.Biogas is a kind of mixed gas, can burn.Biogas is the inflammable gas that organism produces through microbiological anaerobic digestion.
Biogas is the mixture of multiple gases, and generally, containing methane 50~70%, all the other are carbonic acid gas and a small amount of nitrogen, hydrogen and hydrogen sulfide etc.Its characteristic is similar to Sweet natural gas.In air as contain 8.6~20.8%(by volume) biogas time, will form volatile mixed gas.Biogas except direct burning for cooking, dry agricultural byproducts, heating, illumination and gas welding etc., also can make the industrial chemicals such as the fuel of oil engine and methanol, formalin, tetracol phenixin.Feed liquid and the sediment of after firedamp gas equipment fermentation, discharging, contain more rich nutritive substance, can be used as fertilizer and feed.
Biogas is some organic substances, and under certain temperature, humidity, acidity condition, isolated air (as with methane-generating pit), through microbial process (fermentation) and the inflammable gas of generation.It contains a small amount of hydrogen sulfide, so stink slightly.Fermentation is complicated biochemical change, has many microorganisms to participate in.Reaction roughly divides two stages: (1) microorganism becomes simple material the carbohydrate in complicated organic substance, fat, protein degradation, as lower fatty acid, alcohol, aldehyde, carbonic acid gas, ammonia, hydrogen and hydrogen sulfide etc.(2), by the effect of methane bacterial classification, make some simple materials become methane.To normally produce biogas, be necessary for microorganism and create good condition, make it can survive, breed.Methane-generating pit must meet multiple condition.First, methane-generating pit is airtight.Organic substance is fermented into biogas, is the result of multiple anerobe activity, therefore will cause the anaerobic environment of an anerobe activity.To note isolated air building when methane-generating pit, airtight, do not seep water.Secondly, in methane-generating pit, to maintain 20~40 ℃ because conventionally at this temperature factor of created gase the highest.The 3rd, methane-generating pit will have sufficient nutrient.Microorganism will survive, breed, and must from fermented material, draw nutrient.In the fermentation raw material of methane-generating pit, human and animal excreta can provide nitrogen element, and the Mierocrystalline celluloses such as the stalk of farm crop can provide carbon.The 4th, fermentation raw material will contain suitable quantity of water, and moisture 80% left and right in the fermentation raw material of general requirement methane-generating pit is too much or very few all unfavorable to aerogenesis.The 5th, the pH value general control of methane-generating pit is 7~8.5.
In the last few years, biogas was progressively promoted and was come in vast rural area as a kind of clean energy, had following effect for rural area: (1) biogas can not only solve rural energy problem, and can increase Organic Fertilizer Resources, improve quality and increase fertilizer efficiency, thereby improve crop yield, improvement soil; (2) use biogas, can save in a large number the organism such as stalk, hay, to be used for producing animal feed and as paper making raw material and handicraft starting material; (3) set up biogas and can reduce the phenomenon of haggling trees and disorderly stripping vegetation, protection vegetation, makes agricultural production system progressively to cycle development; (4) set up biogas, be conducive to the generation of environment purification and minimizing disease.This is that the germ mortality in human and animal excreta, improves environmental health condition because in methane-generating pit fermentative processing process; (5) with the biogas illumination of cooking, both saved household economy spending, the work time of saving again housewife, reduce labour intensity; (6) use natural pond fertilizer, improve agricultural product quality and quality, increase income, reduce agricultural pollution, for Agricultural product without pollution lays the foundation.Conventional material cycle utilize the type ecosystem mainly contain plant husbandry-aquaculture-biogas engineering three in conjunction with, aquaculture-fishery-plant husbandry three in conjunction with and the type such as the ecological engineering of aquaculture-fishery-forestry three combinations.It is the most general that wherein the material cycle of plant husbandry-aquaculture-biogas engineering three combinations is utilized the application of type ecological engineering, and effect is best.
But the accumulator unit sealing effectiveness that the biogas in existing biogas fermentation treatment system stores is poor, easily produce gas leakage, the standing storage that has influence on biogas is used.
Utility model content
The utility model, in order to solve weak point of the prior art, provides a kind of marsh gas power generation of accumulator unit good airproof performance, the accumulator unit that burning utilizes system.
For solving the problems of the technologies described above, the utility model adopts following technical scheme: marsh gas power generation, burning utilizes the accumulator unit of system, comprise the uncovered expansion box of water tank and bottom of open top, water tank and expansion box are all cylindrical, the external diameter of expansion box is less than the internal diameter of water tank, in water tank, be loaded with water, the downward opening of expansion box is buckled in water, expansion box top is provided with escape pipe and pressure transmitter, water tank bottom is provided with the inlet pipe that extend into expansion box top, the top of water tank inwall is provided with baffle plate, the bottom of expansion box outer wall is provided with the limiting plate upper and lower corresponding with baffle plate, bottom in water tank is provided with the hound for fixing inlet pipe,
The inwall of water tank offers four slideways vertically; Every slideway all with the upper and lower staggered arrangement of baffle plate, four slideways are circumferentially evenly arranged along water tank, expansion box middle part outer wall is along being circumferentially evenly provided with four anchors, the outer end of each anchor is respectively equipped with along two rollers that roll in a slideway.
Described water tank bottom is provided with at least two limited posts, and the lower surface of expansion box is provided with the limited block upper and lower corresponding with limited post.
Between the lower surface of described limiting plate and expansion box outer wall, be provided with the first reinforcement gusset, between the upper surface of baffle plate and water tank inwall, be provided with the second reinforcement gusset.
Marsh gas power generation, burning utilizes system also to comprise sewage excrement pond, fermentation pretreatment pool, solar water heater, controlled cluster case type fermentation unit, devulcanizer, biogas electricity generation apparatus and biogas heating unit, the outlet of sewage excrement pond is connected with the import of fermentation pretreatment pool by the first soiling solution pipe, the outlet of fermentation pretreatment pool is connected with the import of controlled cluster case type fermentation unit by the second soiling solution pipe, on the first soiling solution pipe and the second soiling solution pipe, be equipped with sewage valve and sump pump, the water outlet of solar water heater is connected with the hot water inlet of fermentation pretreatment pool and controlled cluster case type fermentation unit respectively by two hot-water lines, on two hot-water lines, be respectively equipped with hot-water valve, the methane outlet of controlled cluster case type fermentation unit is connected with the inlet mouth of devulcanizer by the first tracheae, the air outlet of devulcanizer is connected with the inlet mouth of accumulator unit by the second tracheae, the air outlet of accumulator unit is connected with the inlet mouth of biogas electricity generation apparatus and biogas heating unit with the 4th tracheae by the 3rd tracheae respectively, the first tracheae, the second tracheae, on the 3rd tracheae and the 4th tracheae, be equipped with air valve and tensimeter, on the 3rd tracheae and the 4th tracheae, be equipped with gas meter.
Described controlled cluster case type fermentation unit comprises the liquid storage tank of open top, one upper lateral part of liquid storage tank is provided with opening for feed, the opposite side bottom of liquid storage tank is provided with discharge port, liquid storage tank top is provided with cover plate, cover plate is provided with the motor and speed reducer being in transmission connection, and the power wheel drive end of step-down gear is connected with the stir shaft that vertically stretches to liquid storage tank inside, and stir shaft is provided with at least agitating vane of one deck, cover plate is provided with hot water inlet, and described methane outlet is offered on the cover board.
Marsh gas power generation, burning utilize the technique scheme of system to have following beneficial effect:
Sewage ight soil in sewage excrement pond is transported in fermentation pretreatment pool by sump pump, first pre-treatment contributes to lower one anaerobically fermenting operation so by fermentation, improve factor of created gase, and then through sump pump, the pretreated sewage ight soil of fermentation is transported in controlled cluster case type proving room, meanwhile contribute to ferment pre-treatment and the anaerobically fermenting of the hot water in solar water heater, motor via reducer on controlled cluster case type proving room drives stir shaft to rotate, agitating vane on stir shaft is by the sewage ight soil in liquid storage tank, improve the effect of anaerobically fermenting, thereby raising biogas output, the biogas producing enters into and in devulcanizer, carries out desulfurization, then be stored in the middle of accumulator unit, and then use respectively the gas in accumulator unit to generate electricity and heat with biogas heating unit by biogas electricity generation apparatus, heating, cook, bathing etc.
The natural pond liquid that controlled cluster case type proving room produces and natural pond slag directly as fertilizer sources apply field, also can adopt series of process to produce fertilizer.The taking-up of the natural pond slag in controlled cluster case type proving room adopts raises cover plate taking-up, and natural pond liquid is discharged by the discharge port of liquid storage tank.
Accumulator unit adopts watertight construction, when biogas is entered in expansion box and stored by inlet pipe, in the time that the air pressure in expansion box progressively increases, expansion box floating, float to after certain position, limiting plate expansion box under the stopping of baffle plate no longer floats, and now just the biogas in expansion box need to be discharged, when the air pressure in expansion box reduces, expansion box will sink.Water is by the end opening sealing of expansion box, simple in structure, good sealing effect.Hound guarantees that inlet pipe keeps vertical state.Roller moves up and down along the slideway on water tank inwall, plays good guide effect, avoids expansion box to rock all around, and two rollers of upper and lower correspondence are set on each anchor, can avoid like this expansion box to move up and down time, occurs tilting.Coordinating between the limited block on the limited post of water tank bottom and the lower surface of expansion box, while avoiding expansion box internal pressure too small, expansion box touches hound or water tank bottom.The first reinforcement gusset and second is strengthened gusset and is played respectively the effect that strengthens limiting plate and baffle plate intensity.Pressure transmitter is for monitoring the effect of expansion box internal pressure.
The utility model is reasonable in design, simple in structure, and the resistance to air loss that biogas stores is better, prevents biogas leakage, and biogas is for generating, combustion heating etc., practical, is easy to apply.
Accompanying drawing explanation
Fig. 1 is the two dimensional structure schematic diagram that marsh gas power generation, burning utilize system;
Fig. 2 is the structural representation of controlled cluster case type proving room in Fig. 1;
Fig. 3 is structural representation of the present utility model.
Embodiment
As Fig. 1, shown in Fig. 2 and Fig. 3, marsh gas power generation, burning utilizes system, comprise sewage excrement pond 1, fermentation pretreatment pool 2, solar water heater 3, controlled cluster case type proving room 4, devulcanizer 5, accumulator unit 6, biogas electricity generation apparatus 7 and biogas heating unit 8, the outlet of sewage excrement pond 1 is connected with the import of fermentation pretreatment pool 2 by the first soiling solution pipe 9, the outlet of fermentation pretreatment pool 2 is connected with the import of controlled cluster case type proving room 4 by the second soiling solution pipe 10, on the first soiling solution pipe 9 and the second soiling solution pipe 10, be equipped with sewage valve 11 and sump pump 12, the water outlet of solar water heater 3 is connected with the hot water inlet of fermentation pretreatment pool 2 and controlled cluster case type proving room 4 respectively by two hot-water lines 13, on two hot-water lines 13, be respectively equipped with hot-water valve 14, the methane outlet 39 of controlled cluster case type proving room 4 is connected with the inlet mouth of devulcanizer 5 by the first tracheae 15, the air outlet of devulcanizer 5 is connected with the inlet mouth of accumulator unit 6 by the second tracheae 16, the air outlet of accumulator unit 6 is connected with the inlet mouth of biogas electricity generation apparatus 7 and biogas heating unit 8 with the 4th tracheae 18 by the 3rd tracheae 17 respectively, the first tracheae 15, the second tracheae 16, on the 3rd tracheae 17 and the 4th tracheae 18, be equipped with air valve 19 and tensimeter 20, on the 3rd tracheae 17 and the 4th tracheae 18, be equipped with gas meter 21.
Various valves are for regulating, open or close the effect on each pipe joint road above, when certain equipment goes wrong while overhauling, can close each pipe joint road.Tensimeter 20, for monitoring the pressure of controlled cluster case type proving room 4, devulcanizer 5, accumulator unit 6, the first tracheae 15, the second tracheae 16, the 3rd tracheae 17 and the 4th tracheae 1 biogas, is guaranteed the security in biogas utilization process.Gas meter 21 is for monitoring the volume of biogas electricity generation apparatus 7 and biogas heating unit 8 biogas that uses.
Controlled cluster case type proving room 4 comprises the liquid storage tank 22 of open top, one upper lateral part of liquid storage tank 22 is provided with opening for feed 23, the opposite side bottom of liquid storage tank 22 is provided with discharge port 24, liquid storage tank 22 tops are provided with cover plate 25, cover plate 25 is provided with the motor 26 and the step-down gear 27 that are in transmission connection, the power wheel drive end of step-down gear 27 is connected with the stir shaft 28 that vertically stretches to liquid storage tank 22 inside, stir shaft 28 is provided with at least agitating vane 29 of one deck, cover plate 25 is provided with hot water inlet 30, and described methane outlet 39 is opened on cover plate 25.
Accumulator unit 6 comprises the uncovered expansion box 32 of water tank 31 and bottom of open top, water tank 31 and expansion box 32 are all cylindrical, the external diameter of expansion box 32 is less than the internal diameter of water tank 31, in water tank 31, be loaded with water, the downward opening of expansion box 32 is buckled in water, expansion box 32 tops are provided with escape pipe 33 and pressure transmitter 34, escape pipe 33 is connected with the 3rd tracheae 17 and the 4th tracheae 18, water tank 31 bottoms are provided with the inlet pipe 35 that extend into expansion box 32 tops, the top of water tank 31 inwalls is provided with baffle plate 36, the bottom of expansion box 32 outer walls is provided with and baffle plate corresponding limiting plate 37 Shang Xia 36, bottom in water tank 31 is provided with the hound 38 for fixing inlet pipe 35, guarantee that inlet pipe 35 keeps vertical state.
The inwall of water tank 31 offers four slideways 40 vertically; Every slideway 40 all with baffle plate staggered arrangement Shang Xia 36, article four, slideway 40 is circumferentially evenly arranged along water tank 31, expansion box 32 middle part outer walls are along being circumferentially evenly provided with four anchors 41, and the outer end of each anchor 41 is respectively equipped with two rollers 42 along slideway 40 interior rollings.
Water tank 31 bottoms are provided with at least two limited posts 43, and the lower surface of expansion box 32 is provided with and limited post corresponding limited block 44 Shang Xia 43.
Between the lower surface of limiting plate 37 and expansion box 32 outer walls, be provided with the first reinforcement gusset 45, between the upper surface of baffle plate 36 and water tank 31 inwalls, be provided with the second reinforcement gusset 46.
Sewage excrement pond 1, fermentation pretreatment pool 2, solar water heater 3, devulcanizer 5, biogas electricity generation apparatus 7 and biogas heating unit 8 in the middle of the utility model are existing mature technology, concrete structure repeats no more, wherein biogas heating unit 8 can carry out heating boiler, cook, bathing, heating etc.
Marsh gas power generation, burning utilizes system in the time that work is used, sewage ight soil in sewage excrement pond 1 is transported in fermentation pretreatment pool 2 by sump pump 12, first pre-treatment contributes to lower one anaerobically fermenting operation so by fermentation, improve factor of created gase, and then through sump pump 12, the pretreated sewage ight soil of fermentation is transported in controlled cluster case type proving room 4, meanwhile contribute to ferment pre-treatment and the anaerobically fermenting of the hot water in solar water heater 3, motor 26 on controlled cluster case type proving room 4 drives stir shaft 28 to rotate by step-down gear 27, agitating vane 29 on stir shaft 28 is by the sewage ight soil in liquid storage tank 22, improve the effect of anaerobically fermenting, thereby raising biogas output, the biogas producing enters into and in devulcanizer 5, carries out desulfurization, then be stored in the middle of accumulator unit 6, and then use respectively the gas in accumulator unit 6 to generate electricity and heat with biogas heating unit 8 by biogas electricity generation apparatus 7, heating, cook, bathing etc.
The natural pond liquid that controlled cluster case type proving room 4 produces and natural pond slag directly as fertilizer sources apply field, also can adopt series of process to produce fertilizer.The taking-up of the natural pond slag in controlled cluster case type proving room 4 adopts the form of raising cover plate 25, and natural pond liquid is discharged by the discharge port 24 of liquid storage tank 22.
Accumulator unit adopts watertight construction, when biogas enters into the interior storage of expansion box 32 by inlet pipe 35, in the time that the air pressure in expansion box 32 progressively increases, expansion box 32 floats, float to after certain position, limiting plate 37 expansion box 32 under the stopping of baffle plate 36 no longer floats, and now just the biogas in expansion box 32 need to be discharged, when the air pressure in expansion box 32 reduces, expansion box 32 will sink.Water is by the end opening sealing of expansion box 32, simple in structure, good sealing effect.Hound 38 guarantees that inlet pipe 35 keeps vertical state.Roller 42 moves up and down along the slideway 40 on water tank 31 inwalls, play good guide effect, avoid expansion box 32 to rock all around, two rollers 42 of upper and lower correspondence are set on each anchor 41, can avoid like this expansion box 32 to move up and down time, occur tilting.Coordinating between the limited block 44 on the limited post 43 of water tank 31 bottoms and the lower surface of expansion box 32, avoid expansion box 32 internal pressures when too small, expansion box 32 touches hound 38 or water tank 31 bottoms.The first reinforcement gusset 45 and second is strengthened gusset 46 and is played respectively the effect that strengthens limiting plate 37 and baffle plate 36 intensity.Pressure transmitter 34 is for monitoring the effect of expansion box internal pressure.
The present embodiment is not done any pro forma restriction to shape of the present utility model, material, structure etc.; any simple modification, equivalent variations and modification that every foundation technical spirit of the present utility model is done above embodiment, all belong to the protection domain of technical solutions of the utility model.

Claims (3)

1. marsh gas power generation, burning utilizes the accumulator unit of system, it is characterized in that: the uncovered expansion box of water tank and bottom that comprises open top, water tank and expansion box are all cylindrical, the external diameter of expansion box is less than the internal diameter of water tank, in water tank, be loaded with water, the downward opening of expansion box is buckled in water, expansion box top is provided with escape pipe and pressure transmitter, water tank bottom is provided with the inlet pipe that extend into expansion box top, the top of water tank inwall is provided with baffle plate, the bottom of expansion box outer wall is provided with the limiting plate upper and lower corresponding with baffle plate, bottom in water tank is provided with the hound for fixing inlet pipe,
The inwall of water tank offers four slideways vertically; Every slideway all with the upper and lower staggered arrangement of baffle plate, four slideways are circumferentially evenly arranged along water tank, expansion box middle part outer wall is along being circumferentially evenly provided with four anchors, the outer end of each anchor is respectively equipped with along two rollers that roll in a slideway.
2. marsh gas power generation according to claim 1, burning utilize the accumulator unit of system, it is characterized in that: described water tank bottom is provided with at least two limited posts, and the lower surface of expansion box is provided with the limited block upper and lower corresponding with limited post.
3. marsh gas power generation according to claim 1 and 2, burning utilize the accumulator unit of system, it is characterized in that: between the lower surface of described limiting plate and expansion box outer wall, be provided with the first reinforcement gusset, between the upper surface of baffle plate and water tank inwall, be provided with the second reinforcement gusset.
CN201320731258.XU 2013-11-19 2013-11-19 Gas storage device of biogas power generation and burning utilization system Expired - Fee Related CN203668384U (en)

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CN201320731258.XU CN203668384U (en) 2013-11-19 2013-11-19 Gas storage device of biogas power generation and burning utilization system

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105385591A (en) * 2015-12-28 2016-03-09 邓万才 Constant-pressure biogas digester

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105385591A (en) * 2015-12-28 2016-03-09 邓万才 Constant-pressure biogas digester

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Granted publication date: 20140625

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