CN106434296B - Integrated dry-wet anaerobic digestion device - Google Patents

Integrated dry-wet anaerobic digestion device Download PDF

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CN106434296B
CN106434296B CN201610895722.7A CN201610895722A CN106434296B CN 106434296 B CN106434296 B CN 106434296B CN 201610895722 A CN201610895722 A CN 201610895722A CN 106434296 B CN106434296 B CN 106434296B
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biogas
pipe
dry
wet
zone
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CN106434296A (en
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邹锦林
王艳明
谢奎
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Shanghai Municipal Engineering Design Insitute Group Co Ltd
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Shanghai Municipal Engineering Design Insitute Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M23/00—Constructional details, e.g. recesses, hinges
    • C12M23/34—Internal compartments or partitions
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M27/00—Means for mixing, agitating or circulating fluids in the vessel
    • C12M27/02—Stirrer or mobile mixing elements
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
    • C12M29/06—Nozzles; Sprayers; Spargers; Diffusers
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
    • C12M29/06—Nozzles; Sprayers; Spargers; Diffusers
    • C12M29/08—Air lift
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M41/00—Means for regulation, monitoring, measurement or control, e.g. flow regulation
    • C12M41/12—Means for regulation, monitoring, measurement or control, e.g. flow regulation of temperature
    • C12M41/18—Heat exchange systems, e.g. heat jackets or outer envelopes
    • C12M41/22—Heat exchange systems, e.g. heat jackets or outer envelopes in contact with the bioreactor walls
    • 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
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/20—Sludge processing

Abstract

The invention discloses an integrated dry-wet anaerobic digestion device which comprises a digestion tank, wherein a feed pipe and a bottom slag discharge pipe are arranged at the bottom of the digestion tank; the dry anaerobic zone is provided with a stirrer, the stirrer is used for stirring materials, and large-particle-size organic materials are degraded into small-particle-size materials in the dry anaerobic zone, and a large number of biogas bubbles are generated; the solid phase material with large particle size returns to the dry anaerobic zone through the three-phase separation zone, while the small particle size and the liquid phase enter the wet anaerobic zone; the wet anaerobic zone is provided with a biogas aerator pipe, the upper part of the wet anaerobic zone is provided with an upper discharging pipe, water is discharged from the upper discharging pipe in an overflow mode, biogas generated by anaerobic enters a top air chamber above the wet anaerobic zone, and the top of the top air chamber is provided with a top biogas pipe. The integrated dry-wet anaerobic digestion device provided by the invention has the advantages of high organic matter degradation rate, high biogas yield, low biogas residue yield and good effluent quality, can realize automatic continuous biogas production of high-concentration organic solid wastes, and is especially suitable for anaerobic digestion production of organic materials with low water content and high impurity content.

Description

Integrated dry-wet anaerobic digestion device
Technical Field
The invention belongs to the technical field of organic material treatment, relates to an anaerobic digestion device for organic materials, and in particular relates to an integrated dry-wet anaerobic digestion device.
Background
The organic garbage comprises food waste, kitchen waste, municipal sludge, livestock manure, vegetable market waste, supermarket expired food, food processing waste, vinasse, agricultural organic solid waste and other high-concentration organic solid waste, is imperfect in China due to a classification mechanism, and the traditional organic garbage is usually treated by landfill, incineration or aerobic composting. Due to the restriction of available land, landfill is faced with more and more difficult site selection problems in China; although a better reduction effect can be obtained by incineration, the organic garbage with higher water content tends to greatly increase the incineration cost; organic garbage compost has been in China for hundreds of years, but has some problems such as odor pollution, product outlet and the like, so that aerobic composting can not thoroughly and effectively solve the problem of centralized disposal of large-scale organic garbage.
The technology of producing biogas by anaerobic digestion can change organic waste into valuable, and the biogas produced by the technology belongs to renewable biomass energy, belongs to new energy which is encouraged to develop by China and replaces fossil fuel, and is particularly important in the age of shortage of world energy. Anaerobic digestion techniques can be classified into dry (15-40% solids) and wet (less than 15%) fermentation based on the solids content of the feed.
The dry anaerobic digestion has relatively high requirements on equipment such as feeding and discharging, fermentation stirring and the like, and the core technology is mainly imported abroad at present and mainly comprises French VALORGA, belgium DRAGO, switzerland KOMPOGAS and Germany BTV technologies. The dry anaerobic digestion aims at fermenting and producing gas in a viscous solid phase state of the organic garbage, settled sand and scum cannot be layered in a digestion device, the feeding grain diameter is about 50mm, and the pretreatment requirement is low. Therefore, the dry anaerobic digestion not only can greatly shorten the pretreatment process flow, but also can remarkably reduce the subsequent biogas slurry dehydration and sewage treatment cost without adding water, and the volume required by fermentation is smaller than that of the wet anaerobic digestion due to the adoption of high-load digestion. However, the dry anaerobic digestion has lower mass transfer efficiency than the wet type, and the high-load digestion effluent has poor quality, so that the subsequent sewage treatment is difficult.
Conventional wet anaerobic digestion devices include CSTR, UASB, UBF, IC processes and the like. UASB, UBF, IC is applied to the treatment of high-concentration organic wastewater, and has the common advantages of high degradation rate of organic matters and good quality of effluent. However, wet anaerobic digestion has relatively high requirements on feed water content and feed (particle size is usually less than 8 mm), and fixed three-phase separators in UASB and IC anaerobic reactors are easy to be blocked by high-concentration materials, UBF packing is also required to strictly control the content of feed impurities due to the blocking problem. The CSTR process has lower impurity content requirements than other wet anaerobic digestion processes, and has found more application in treating organic materials with higher water content in recent years.
How to fully exert the advantages of wet anaerobic digestion and dry anaerobic digestion, the traditional process adopts a split design, namely, after the dry anaerobic digestion discharge is dehydrated, the liquid phase enters the wet anaerobic digestion, the process is complex, the occupied area is large, an intermediate buffer and a dehydration system are required to be arranged, because the dry anaerobic digestion mode is adopted, the discharged material contains a large amount of undegraded organic matters, only the liquid phase part enters the wet anaerobic digestion after passing through the dehydration system, and the dehydrated solid phase still contains more undegraded organic matters.
Disclosure of Invention
The invention aims to provide an organic garbage integrated dry-wet anaerobic digestion device with higher degradation efficiency according to the defects of the existing dry-type and wet-type anaerobic digestion technology.
In order to achieve the above object, the technical scheme of the present invention is as follows: the integrated dry-wet anaerobic digestion device comprises a digestion tank, wherein a feed pipe and a bottom slag discharging pipe are arranged at the bottom of the digestion tank, and the integrated dry-wet anaerobic digestion device is characterized in that a dry anaerobic zone, a three-phase separation zone and a wet anaerobic zone are respectively arranged in the digestion tank from bottom to top;
the dry anaerobic zone is provided with a stirrer, the stirrer is used for stirring materials, large-particle-size organic materials are degraded into small-particle-size materials in the dry anaerobic zone, a large number of biogas bubbles are generated at the same time, and heavy inorganic impurities are discharged through a bottom slag discharge pipe;
the three-phase separation zone is internally provided with a rotary triangular separator and a baffle plate positioned above the rotary triangular separator, a gap is arranged between the baffle plate and the rotary triangular separator, a middle biogas pipe is also arranged in the three-phase separation zone, a large number of rising biogas bubbles enable peripheral solid phase materials to rise along the digestion tank and are isolated by the baffle plate and the rotary triangular separator, the biogas bubbles are collected by the middle biogas pipe after being broken in a middle air chamber, the large-particle-size solid phase materials return to the dry anaerobic zone under the action of gravity, and the small-particle-size liquid phase enters the wet anaerobic zone through the gap between the rotary triangular separator and the baffle plate in a slurry mode;
the wet anaerobic zone comprises a baffle plate and a biogas aeration pipe arranged on the side wall of the digestion tank above the baffle plate, wherein the biogas aeration pipe is provided with a plurality of aeration holes, the aeration holes are arranged in the clockwise or anticlockwise direction at the same time, slurry entering the wet anaerobic zone rotates in the clockwise or anticlockwise direction under the action of the biogas aeration pipe, an upper discharging pipe is arranged at the upper part of the wet anaerobic zone, water is discharged from the upper discharging pipe in an overflow mode, biogas generated by anaerobic enters a top air chamber above the wet anaerobic zone, and a top biogas pipe is arranged at the top of the top air chamber.
Preferably, the digestion tank is cuboid, adopts steel concrete structure or steel structure, and the outer wall is the heating heat preservation, the heating heat preservation is including hot water circulation heating coil pipe, rock wool heat preservation and the various steel sheet protective layer of outer wall that sets gradually, makes the tank body temperature moderate maintain 55 + -2 ℃.
Preferably, the feeding pipe is connected with a feeding plunger pump, the bottom deslagging pipe is connected with a discharging plunger pump, and feeding and discharging are completed through the plunger pumps respectively.
Preferably, the stirrer in the dry anaerobic zone is a door frame type stirrer, the stirring shaft is arranged along the length direction of the digestion tank and driven by a motor arranged on the side wall, and the stirring paddles are arranged on the side part of the stirring shaft at horizontal intervals with the stirring shaft as the center.
Preferably, the biogas aeration pipe is connected with a biogas blower, the gas inlet of the biogas blower sucks gas from the top gas chamber, the biogas aeration pipe consists of an aeration main pipe and branch pipes, aeration holes are arranged on the biogas aeration pipe at intervals, and aeration Kong Chuqi is arranged clockwise, so that slurry in the wet anaerobic zone is in a clockwise rotation stirring state.
Preferably, the rotary triangular separator arranged in the three-phase separation area rotates clockwise or anticlockwise along the intermediate shaft and is driven by a motor arranged on the side wall of the digestion tank, the rotary triangular separator is of an equilateral triangle, and the minimum distance between the rotary triangular separator and the baffle is 3-5 mm and the maximum distance is 5-10 mm in the rotation process.
Preferably, a positive and negative pressure protector is arranged at the top of the digestion tank.
Preferably, the upper discharging pipe adopts an oblique inserting type discharging pipe, an included angle between the oblique inserting type discharging pipe and the side wall of the digestion tank is 40-60 degrees, and the effective operation liquid level height of the tail end of the oblique inserting type discharging pipe and the fermentation device is not less than 500mm.
Preferably, a funnel-shaped top deslagging pipe is arranged above the wet anaerobic zone, and deslagging is carried out in a gravity overflow mode.
Preferably, inclined baffles are symmetrically arranged on two sides of the rotary triangular separator in the three-phase separation area, the inclined baffles and the side wall of the digestion tank form an inclined angle of 45 degrees, the inclined baffles and the rotary triangular separator form a group of dynamic three-phase separators, the baffles and the side wall of the fermentation device form a middle air chamber, a biogas stirring pipe is arranged at the top of the baffles, and one or more groups of three-phase separators are arranged in the three-phase separation area.
The three-phase separation area is not provided with a stirring device, most materials can be precipitated to the dry anaerobic area by utilizing gravity precipitation, meanwhile, the rotating triangular separator is arranged to control the particle size entering the wet anaerobic area, and a biogas stirring pipe at the top of the baffle plate is used for assisting, so that the materials from the dry anaerobic area can be prevented from blocking a gap between the triangular separator and the baffle plate, and the materials with small particle size and liquid phase enter the wet anaerobic area through the gap to be subjected to wet anaerobic digestion under the biogas stirring effect. Therefore, the large-particle-size materials can flow back to the dry anaerobic zone, and the digestion time is prolonged compared with that of the traditional dry anaerobic zone, so that the degradation efficiency of the whole system is greatly improved. The integrated dry-wet anaerobic digestion device provided by the invention has the advantages of high biogas yield, no water consumption, good water quality, low biogas residue yield and the like, can automatically and continuously produce biogas from organic materials with a solid content of 15-40%, is especially suitable for the anaerobic digestion production of organic materials with low water content and high impurity content, and can improve the organic matter degradation rate by 5-10% and the biogas yield by 10-15% compared with the traditional split anaerobic digestion device.
Drawings
FIG. 1 is a schematic cross-sectional view of an integrated wet and dry anaerobic digestion device according to the present invention.
FIG. 2 is a schematic longitudinal section of an integrated dry-wet anaerobic digestion device according to the present invention.
Fig. 3 is a schematic view showing the state of a rotary triangular separator and a baffle plate of an integrated dry-wet anaerobic digestion device.
FIG. 4 is a schematic diagram of an integrated dry-wet anaerobic digestion device employing multiple sets of rotating triangular separators according to the present invention.
The drawings include: the device comprises a digestion tank 1, a feed pipe 2, a door frame type stirrer 3, a rotary triangular separator 4, a baffle 5, a biogas aeration pipe 6, a positive and negative pressure protector 7, a top biogas pipe 9, an upper discharge pipe 10, a bottom slag discharge pipe 11, a top slag discharge pipe 12, a heating insulation layer 13, a middle air chamber 14, a top air chamber 15, a paddle stirring track line 16, a biogas stirring track line 17 and a water passing gap 18.
Detailed Description
The invention is further described by the following examples, which are given by way of illustration only and are not limiting of the scope of the invention.
As shown in fig. 1 and 2, the integrated dry-wet anaerobic digestion device provided by the invention comprises a digestion tank 1, wherein a dry anaerobic zone I, a three-phase separation zone II and a wet anaerobic zone III are respectively arranged in the digestion tank 1 from bottom to top. The dry anaerobic zone I comprises a blade stirring track line 16 containing area and a bottom area thereof, and is provided with a feed pipe 2, a doorframe type stirrer 3 and a bottom slag discharging pipe 11; the three-phase separation zone II comprises a region from above the paddle stirring track line 16 to below the baffle plate, and is provided with a rotary triangular separator 4, the baffle plate 5 and a middle air chamber formed by the same; the wet anaerobic zone III comprises a zone above a baffle, and is provided with a biogas aeration pipe 6, an upper discharging pipe 10, a top slag discharging pipe 12, a top biogas pipe 9 and a positive and negative pressure protector 7; the outer wall of the digestion tank 1 is provided with a heating heat-preserving layer 13 which comprises a hot water circulation heating coil, a rock wool heat-preserving layer and an outer wall color steel plate protective layer; the feeding pipe 2 is connected with a feeding plunger pump, the bottom slag discharging pipe 11 is connected with a discharging plunger pump, and the biogas aeration pipe is connected with a biogas blower; the door frame type stirrer and the rotary triangular separator are respectively driven by motors arranged on the side walls.
The following is an embodiment of the present invention, and in particular, the present embodiment relates to an integrated dry-wet anaerobic digestion device.
In this embodiment, the digestion tank is a cuboid, adopts a steel concrete structure or a steel structure, the outer wall is a heating insulation layer 13, and comprises a hot water circulation heating coil, a rock wool insulation layer and an outer wall color steel plate protection layer, the hot water circulation heating coil of the outer wall of the fermentation device is distributed from a feeding end to a discharging end along the length direction of the digestion tank body from a dense state to a sparse state, the thickness of the heating coil and the rock wool insulation layer is calculated and determined according to local climate conditions so as to compensate tank heat loss caused by feeding and digestion tank heat dissipation, and the temperature of the tank body is moderately maintained at 55+/-2 ℃ by the circulating hot water coil through an automatic temperature control system.
The door frame type stirrer 3 arranged in the dry anaerobic zone I is provided with stirring shafts along the length direction of the fermentation device, the stirring paddles are driven by motors arranged on the side walls, and the stirring shafts are used as centers, and are horizontally arranged on the side parts of the stirring shafts at intervals.
The rotary triangular separator arranged in the three-phase separation area II can rotate clockwise or anticlockwise along the intermediate shaft and is driven by a motor arranged on the side wall, the triangular separator is of an equilateral triangle, the distance between the rotary triangular separator and the baffle plate changes from small to large to small in the rotating process, and the minimum distance between the rotary triangular separator and the baffle plate is 3-5 mm and the maximum distance between the rotary triangular separator and the baffle plate is 5-10 mm in the rotating process through the arrangement of the size and the axial center position of the triangular separator.
The three-phase separation zone II is provided with a symmetrical 45-degree baffle, the baffle 5 and the rotary triangular separator 4 form a group of dynamic three-phase separators (the three phases are gas phase, water phase and solid phase), the baffle 5 and the side wall of the digestion tank 1 form a middle air chamber, when biogas bubbles carrying sludge rise to the middle air chamber 14, the biogas bubbles (gas phase) are broken, the sludge (solid phase) carried by the biogas bubbles sinks in the zone, a solid-liquid mixture (liquid phase with smaller particle size is mainly) enters the wet anaerobic zone III through a water gap 18 between the rotary triangular separator and the baffle, and the anaerobic digestion device can be provided with one or more groups of dynamic three-phase separators according to the gas yield, the anaerobic digestion device size and the like.
The wet anaerobic zone III is internally provided with a biogas aeration pipe 6, the biogas aeration pipe 6 is fixed on the baffle 5 and the side wall of the digestion tank 1, the biogas aeration pipe is connected with a biogas blower, the gas inlet of the biogas blower is sucked from the top gas chamber 15, the biogas aeration pipe consists of an aeration main pipe and branch pipes, the biogas aeration pipe is provided with aeration holes at regular intervals, the aeration Kong Chuqi direction is clockwise arranged, the slurry in the wet anaerobic zone is in a clockwise rotation stirring state, and the biogas generated by anaerobic enters the top gas chamber above the wet anaerobic zone and is collected by the top biogas pipe 9.
The upper discharging pipe 10 adopts an oblique-insertion gravity overflow discharging mode, the included angle between the upper discharging pipe and the wall of the fermentation device is 40-60 degrees, and the effective operation liquid level height of the tail end of the oblique-insertion discharging pipe and the fermentation device is not less than 500mm. The bottom slag discharging pipe 11 is connected with a plunger pump, and is pumped to a designated place by the plunger pump.
The anaerobic digestion device operates according to the following method (i.e., principle):
the plunger pump is utilized to input dehydrated biogas residues, municipal dehydrated sludge, river sediment and other materials which can be used for anaerobic digestion inoculation into the tank body of the digestion tank 1 to the liquid level of the half tank, the external circulation hot water heating coil is started to raise the temperature of the digestion tank to 55 ℃, the feeding amount is gradually adjusted until the anaerobic digestion tank starts to produce gas, and the designed feeding load is achieved. The designed feed rate was maintained daily by turning on the plunger pump and the organic material (controlled at about 50 mm) was pumped from the digester bottom feed pipe 2 into the dry anaerobic zone I. The retention time of the organic materials in the dry anaerobic zone I is 25-30 days, the dry anaerobic zone I realizes material stirring through the doorframe type stirrer 3, and stirring paddles are symmetrically arranged at horizontal intervals with a stirring shaft as a center (namely, three paddles are adopted by the stirring shaft paddles, the angle is 60 degrees, and the stirring rotating speed is 1-2 revolutions per minute; the bottom of the digestion tank is provided with a bottom deslagging pipe 11 which mainly discharges heavy inorganic impurities such as sand, shells and the like, and deslagging is carried out periodically by a plunger pump (the deslagging period is determined according to the content of the heavy inorganic impurities in the materials); the large-grain-size organic materials are degraded into small-grain-size materials in a dry anaerobic zone I, a large number of biogas bubbles are generated simultaneously when the large-grain-size organic materials pass through a three-phase separation zone II, the large-size rising biogas bubbles enable peripheral solid-phase materials to rise along a digestion tank, the peripheral solid-phase materials are isolated by a baffle plate 5 and a rotary triangular separator 4, the biogas bubbles are collected by a middle biogas pipe 8 after a middle air chamber is broken, the large-grain-size solid-phase materials return to the dry anaerobic zone I under the action of gravity, the small-grain-size solid-phase materials and liquid phases can enter the wet anaerobic zone III through the gap between the rotary triangular separator 4 and the baffle plate 5, the anaerobic digestion device can be provided with one or more groups of dynamic three-phase separators according to the gas yield, the size of the anaerobic digestion device and the like, slurry entering the wet anaerobic zone III rotates clockwise under the action of a biogas aeration pipe 6, the biogas aeration pipe 6 is fixed on the side walls of the baffle plate 5 and the digestion tank 1, the biogas aeration pipe 6 is arranged in a fishbone mode, the middle main pipe and the branch pipe are formed, phi 1cm is arranged at intervals of 20cm to serve as aeration holes, the opening direction enables the water flow in the wet anaerobic zone III to rotate clockwise, the biogas aeration pipe 6 is connected with the biogas inlet air chamber, the biogas is blown by a blower, continuous stirring in a wet anaerobic zone III is realized through the device, hydraulic retention time in the wet anaerobic zone III is 5-10 days, biogas generated by anaerobism is collected through a top biogas pipe 9, a positive and negative pressure protector 7 is arranged on the top of an anaerobic digestion tank to protect the tank body from safety problems caused by severe pressure fluctuation, a funnel-shaped top deslagging pipe 12 is arranged in the wet anaerobic zone III, slag is discharged in a gravity overflow mode (the slag can be discharged outwards periodically according to the thickness of the slag), and a daily discharging flow is realized through an upper discharging pipe 10 in an overflow mode. The continuous biogas production operation of the anaerobic digestion tank is realized through the processes of feeding, temperature compensation, digestion, discharging and the like.
The integrated dry-wet anaerobic digestion device provided by the invention has the advantages of high biogas yield, no water consumption, good water quality, low biogas residue yield and the like, can automatically and continuously produce biogas from organic materials with a solid content of 15-40%, is especially suitable for the anaerobic digestion production of organic materials with low water content and high impurity content, and can improve the organic matter degradation rate by 5-10% and the biogas yield by 10-15% compared with the traditional split anaerobic digestion device.
While the present invention has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the invention. Many modifications and substitutions of the present invention will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the invention should be limited only by the attached claims.

Claims (9)

1. The integrated dry-wet anaerobic digestion device comprises a digestion tank, wherein a feed pipe and a bottom slag discharging pipe are arranged at the bottom of the digestion tank, and the integrated dry-wet anaerobic digestion device is characterized in that a dry anaerobic zone, a three-phase separation zone and a wet anaerobic zone are respectively arranged in the digestion tank from bottom to top;
the dry anaerobic zone is provided with a stirrer, the stirrer is used for stirring materials, large-particle-size organic materials are degraded into small-particle-size materials in the dry anaerobic zone, a large number of biogas bubbles are generated at the same time, and heavy inorganic impurities are discharged through a bottom slag discharge pipe;
the three-phase separation zone is internally provided with a rotary triangular separator and a baffle plate positioned above the rotary triangular separator, a gap is formed between the baffle plate and the rotary triangular separator, the three-phase separation zone is internally provided with a middle biogas pipe, a large number of rising biogas bubbles enable peripheral solid phase materials to rise along a digestion tank and are isolated by the baffle plate and the rotary triangular separator, the biogas bubbles are collected by the middle biogas pipe after being broken in a middle air chamber, the large-grain solid phase materials return to a dry anaerobic zone under the action of gravity, the small-grain and liquid phase enter the wet anaerobic zone through the gap between the rotary triangular separator and the baffle plate in a slurry mode, the rotary triangular separator arranged in the three-phase separation zone rotates clockwise or anticlockwise along a middle shaft and is driven by a motor arranged on the side wall of the digestion tank, the rotary triangular separator is in an equilateral triangle shape, and the rotary triangular separator has a minimum distance of 3-5 mm and a maximum distance of 5-10 mm from the baffle plate in the rotation process;
the wet anaerobic zone comprises a baffle plate and a biogas aeration pipe arranged on the side wall of the digestion tank above the baffle plate, wherein the biogas aeration pipe is provided with a plurality of aeration holes, the aeration holes are arranged in the clockwise or anticlockwise direction at the same time, slurry entering the wet anaerobic zone rotates in the clockwise or anticlockwise direction under the action of the biogas aeration pipe, an upper discharging pipe is arranged at the upper part of the wet anaerobic zone, water is discharged from the upper discharging pipe in an overflow mode, biogas generated by anaerobic enters a top air chamber above the wet anaerobic zone, and a top biogas pipe is arranged at the top of the top air chamber.
2. The integrated dry-wet anaerobic digestion device according to claim 1, wherein the digestion tank is cuboid, adopts a steel concrete structure or a steel structure, and the outer wall is a heating insulation layer, and the heating insulation layer comprises a hot water circulation heating coil, a rock wool insulation layer and an outer wall color steel plate protection layer which are sequentially arranged, so that the tank body temperature is moderately maintained at 55+/-2 ℃.
3. The integrated dry-wet anaerobic digestion device according to claim 1, wherein the feed pipe is connected with a feed plunger pump, the bottom slag discharging pipe is connected with a discharge plunger pump, and the feed and the discharge are respectively completed through the plunger pumps.
4. The integrated dry-wet anaerobic digestion device according to claim 1, wherein the stirrer of the dry-type anaerobic zone is a door frame type stirrer, a stirring shaft is arranged along the length direction of the digestion tank and is driven by a motor arranged on the side wall, and stirring paddles are arranged on the side part of the stirring shaft at horizontal intervals with the stirring shaft as the center.
5. The integrated dry-wet anaerobic digestion device according to claim 1, wherein the biogas aeration pipe is connected with a biogas blower, the biogas blower air inlet sucks air from the top air chamber, the biogas aeration pipe is composed of an aeration main pipe and a branch pipe, aeration holes are arranged on the biogas aeration pipe at regular intervals, and aeration Kong Chuqi directions are arranged clockwise, so that slurry in the wet anaerobic zone is in a clockwise rotation stirring state.
6. The integrated dry-wet anaerobic digestion device according to claim 1, wherein a positive-negative pressure protector is arranged at the top of the digestion tank.
7. The integrated dry-wet anaerobic digestion device according to claim 1, wherein the upper discharge pipe is an oblique insertion type discharge pipe, an included angle between the oblique insertion type discharge pipe and the side wall of the digestion tank is 40-60 degrees, and the effective operation liquid level height of the tail end of the oblique insertion type discharge pipe and the fermentation device is not less than 500mm.
8. The integrated dry-wet anaerobic digestion device according to claim 1, wherein a funnel-shaped top slag discharging pipe is arranged above the wet anaerobic zone, and slag is discharged in a gravity overflow mode.
9. The integrated dry-wet anaerobic digestion device according to claim 1, wherein inclined baffles are symmetrically arranged on two sides of a rotary triangular separator of the three-phase separation zone, the inclined baffles and the side wall of the digestion tank form an inclined angle of 45 degrees, the inclined baffles and the rotary triangular separator form a group of dynamic three-phase separators, the baffles and the side wall of the fermentation device form a middle air chamber, a biogas stirring pipe is arranged at the top of the baffles, and one or more groups of three-phase separators are arranged in the three-phase separation zone.
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CN108342296B (en) * 2018-03-09 2021-04-27 中国科学院广州能源研究所 Continuous dry process anaerobic reactor capable of treating non-fluidized raw materials
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