CN113373041B

CN113373041B - Large/ultra-large methane tank suitable for dry continuous fermentation

Info

Publication number: CN113373041B
Application number: CN202110617090.9A
Authority: CN
Inventors: 曹秀保
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2022-09-30
Anticipated expiration: 2041-05-28
Also published as: CN113373041A

Abstract

The invention discloses a large/ultra-large methane tank suitable for dry continuous fermentation, which comprises a feeding tank, a fermentation tank, a sunlight room, a heat collection high-temperature water tank and an automatic temperature control system, wherein the fermentation tank is cuboid and comprises: the device comprises a basic base, a pool wall, a supporting steel pipe, a circulating coil pipe and a double-roller feeder with blades; the feeding tank is built on the east of the fermentation tank, and the feeding tank and the fermentation tank are built in a connected manner; the sunlight room is built right above the feeding pool; the heat-collecting high-temperature water tank is arranged right above the fermentation tank; the automatic temperature control system can automatically control the hot water circulation in the heat collection high-temperature water tank, the fermentation tank and the feeding tank. The invention has the advantages that: the methane tank disclosed by the invention is suitable for dry continuous fermentation, can be made into a large/ultra-large methane tank, and in addition, not only is the volume gas production rate remarkably improved (by more than 5 times), but also the methane tank is energy-saving and environment-friendly.

Description

Large/ultra-large methane tank suitable for dry continuous fermentation

Technical Field

The invention relates to a methane tank, in particular to a large/ultra-large methane tank suitable for dry continuous fermentation, belonging to the technical field of environmental protection.

Background

At present, environmental pollution at home and abroad is serious, energy is in short supply, and the development of new energy and renewable new energy is a problem to be solved urgently at present. China pays great attention to the aspect, and a renewable new energy source, namely methane, is vigorously developed for a long time.

In China, the fermentation process of the biogas can be divided into a wet fermentation process and a dry fermentation process from the perspective of fermentation concentration, wherein:

(1) and (3) a wet fermentation process: the dry matter concentration of the fermentation liquid is controlled below 10%, and a large amount of water is added when the fermentation is started. The gas yield of the wet fermentation is very low, and the fermentation liquor used as fertilizer has the problem of inconvenient transportation, storage or application.

(2) And (3) a dry fermentation process: the dry fermentation is also called solid fermentation, the total solid concentration of the fermentation raw materials is controlled to be about 30 percent, the method is basically the same as the concentration of retting compost in rural areas in China, and the method also has the effect of killing two birds with one stone: the fertilizer is retted, a new energy source, namely methane is generated, and the generated methane can be used for generating power and connecting a grid, and can also be used for purifying natural gas for automobile gas filling. The dry fermentation has low energy consumption, low water consumption and no wastewater pollution, and has great advantages compared with the wet fermentation process. However, dry fermentation is difficult to adopt a continuous feeding or semi-feeding mode due to too high solid concentration, and most of the dry fermentation adopts batch feeding (batch fermentation), so that the working efficiency is low.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a large/ultra-large methane tank suitable for dry continuous fermentation.

In order to achieve the above object, the present invention adopts the following technical solutions:

the utility model provides a large-scale/super large-scale methane-generating pit suitable for dry process continuous fermentation which characterized in that, the methane-generating pit includes feeding tank, fermentation vat, sunshine room, thermal-arrest high temperature water tank and automatic temperature control system, wherein:

the fermentation vat is cuboid form, includes: the device comprises a basic base, a pool wall, a supporting steel pipe, a circulating coil pipe and a double-roller feeder with blades, wherein the pool wall consists of a pool wall jacket water tank and an additional structure which is positioned on the outer side of the pool wall jacket water tank and plays a role in heat absorption or/and heat preservation; the supporting steel pipes are composed of transverse supporting steel pipes and vertical supporting steel pipes, the vertical supporting steel pipes are welded and communicated with the transverse supporting steel pipes, the transverse supporting steel pipes are welded and communicated with the tank wall jacket water tank, and the supporting steel pipes are integrally and uniformly arranged inside the fermentation tank; the circulating coil is arranged at the bottom of the fermentation tank; the double-roller feeder with the blades comprises two feeding motors, two roller shafts, two rollers, two roller guard plates and a plurality of blades, wherein the blades are rectangular, the roller guard plates are arc-shaped, the two roller shafts are equal to the rollers in length, the blades are respectively welded on the outer walls of the two rollers along the axis direction, the two rollers are respectively installed on the two roller shafts, the two feeding motors are respectively bonded with the two roller shafts, during construction, the two roller shafts are respectively and horizontally installed between the south side and the north side of a fermentation tank through an upper bearing and a lower bearing, the blades on the two rollers are matched to be capable of being engaged to clamp fermentation materials, and the two roller guard plates are respectively arranged right above and right below the upper roller and the lower roller;

the feeding tank is built on the east of the fermentation tank, the feeding tank and the fermentation tank are integrally built, and a heating water pipe is arranged in the feeding tank;

the sunlight room is built right above the feeding pool;

the heat collection high-temperature water tank is arranged right above the fermentation tank;

automatic temperature control system comprises temperature sensor, circulating pump, stop valve and temperature switch board, and wherein, the circulating pump includes: the high-temperature water in the heat-collecting high-temperature water tank is respectively sent into a tank wall jacket water tank, a circulating coil pipe and a heating water pipe of the feeding pool through a water pipe, the fermenting tank high-temperature water circulating pump and the feeding pool high-temperature water circulating pump, and the low-temperature water in the tank wall jacket water tank, the circulating coil pipe and the heating water pipe is respectively sent back into the heat-collecting high-temperature water tank through another water pipe, the fermenting tank low-temperature water circulating pump and the feeding pool low-temperature water circulating pump; the temperature sensors are respectively arranged in the heat collection high-temperature water tank, the pool wall jacket water tank and the heating water pipe; the temperature sensor and the circulating pump are in signal connection with the water temperature control cabinet, the temperature sensor sends water temperature information to the water temperature control cabinet, and the water temperature control cabinet automatically controls the on-off of the circulating pump according to the received water temperature information, so that hot water in the heat collection high-temperature water tank circulates in the fermentation tank and the feeding tank respectively.

The large/ultra-large methane tank suitable for dry continuous fermentation is characterized in that the fermentation tank further comprises: the pond internal water jacket tank, the internal water jacket tank is formed by the carbon steel plate welding of the heavy anticorrosive coating of both sides spraying, sets up in the inside of fermentation vat, and is parallel with south side and north side pool wall of fermentation vat, and the east side and the west side pool wall welding of east side and fermentation vat respectively and communicating with each other at the east both ends of thing, and the lower extreme welds through the basic base of a plurality of stands with the fermentation vat, and two spaces are cut apart into with the inside of fermentation vat to internal water jacket tank, form disjunctor fermentation vat.

The large/ultra-large methane tank suitable for dry continuous fermentation is characterized in that the fermentation tank further comprises: the top plate is made of a porous carbon steel plate coated with heavy anticorrosive paint on the surface, is positioned at the upper part of the fermentation tank, and is horizontally welded with a tank wall jacket water tank of the fermentation tank; the plastic hose with steel wires is laid on the top of the top plate, and spray holes are drilled on the plastic hose.

The large/ultra-large biogas digester suitable for dry continuous fermentation is characterized in that for semi-underground and underground biogas digesters, a retaining wall is built on the outer side of the part below the ground of the wall of the fermentation tank, the retaining wall is built into a semicircular shape at a feeding motor to form a pipeline well, slag is filled between the outer retaining wall and the wall of the pipeline well except the pipeline well, a closed waterproof layer is arranged at the top of the pipeline well, and a well cover is arranged on the pipeline well.

The large/ultra-large biogas digester suitable for dry continuous fermentation is characterized in that the base is of a multilayer structure and sequentially comprises the following components from bottom to top: the anti-radiation building block comprises a sand stone cushion layer, a reinforced concrete base body layer, a heat-insulating waterproof coating layer, an anti-radiation aluminum foil layer A, a rock wool board heat-insulating layer, a mortar layer and a steel plate layer, wherein the rock wool board heat-insulating layer consists of rock wool boards and ribs, the ribs are formed by pouring reinforced concrete and form a plurality of grids on the anti-radiation aluminum foil layer A, and the rock wool boards are laid in the grids; and the upper surface of the steel plate layer is coated with heavy anti-corrosion paint.

The large/ultra-large biogas digester suitable for dry continuous fermentation is characterized in that, for different types of biogas digesters, the additional structures are slightly different, specifically:

for the all-above-ground methane tank, the additional structure comprises a solar coating layer and three hollow PC sunlight plates C, wherein the solar coating layer is coated on the outer wall of the outer side carbon steel plate of the tank wall jacket water tank, and the three hollow PC sunlight plates C are arranged on the outer side of the solar coating layer;

for an underground methane tank, the additional structure comprises a radiation-proof aluminum foil layer B, a high-density XPS (extruded polystyrene foam) board, a rock wool board, a plastic board and a protective steel board, wherein the radiation-proof aluminum foil layer B is pasted on the outer wall of the outer side carbon steel board of the surrounding tank wall jacket water tank, the high-density XPS extruded polystyrene foam board is arranged on the outer sides of the tank wall jacket water tanks on the south side, the north side and the west side, the plastic board is arranged on the outer side of the high-density XPS extruded polystyrene foam board and fixedly mounted with the corresponding outer side carbon steel board of the tank wall jacket water tank, the rock wool board is arranged on the outer side of the tank wall jacket water tank on the east side, and the protective steel board is welded on the outer side of the rock wool board;

for a semi-overground methane tank, the additional structure comprises a solar coating layer, a radiation-proof aluminum foil layer B, a high-density XPS (extruded polystyrene) board, a three-hollow PC sunlight board C, a plastic board, a rock wool board and a protective steel board, wherein for the overground part of the tank wall, the additional structure is arranged and installed as same as the full-overground methane tank, and for the underground part of the tank wall, the additional structure is arranged and installed as same as the underground methane tank.

The large/ultra-large methane tank suitable for dry continuous fermentation is characterized in that the tank wall jacket water tank is provided with a plurality of bolts for preventing the tank wall jacket water tank from deforming due to water pressure, and the bolts are welded with the tank wall jacket water tank in a sealing manner.

The large/ultra-large biogas digester suitable for dry continuous fermentation is characterized in that the heat collection high-temperature water tank consists of a water tank body, I-shaped steel, hot-galvanized small square steel, tempered glass and three hollow PC sunlight plates B, wherein the water tank body is formed by welding hot-galvanized steel plates and is in a flat rectangular shape, and the top steel plate is sprayed with solar paint and is also provided with a plurality of strip holes in sections; the I-shaped steel is arranged in the water tank body, the top surface of the I-shaped steel is arranged in the long-strip-shaped hole of the top surface steel plate, the periphery of the I-shaped steel is fully welded with the long-strip-shaped hole, the bottom surface of the I-shaped steel is welded with the bottom surface steel plate section, and a plurality of channel holes are formed in the vertical surface of the I-shaped steel; the hot-dip galvanized small square steel comprises an upper layer and a lower layer, wherein the upper layer is arranged in a single-row transverse cross manner, the lower layer is arranged in a double-row transverse cross manner, the upper layer and the lower layer are welded together to form a step structure, and the whole hot-dip galvanized small square steel is welded on the top steel plate; toughened glass is laid on the lower layer of hot-dip galvanized small square steel, and a three-hollow PC sunlight panel B is laid on the upper layer of hot-dip galvanized small square steel;

the heat collection high-temperature water tank is high in north and low in south, the periphery of the heat collection high-temperature water tank is hermetically welded with a tank wall jacket water tank of the fermentation tank, and a skylight is arranged at the north end of the heat collection high-temperature water tank.

The large/ultra-large methane tank suitable for dry continuous fermentation is characterized in that the base of the feed tank is formed by extending a base of the fermentation tank to the east, the tank walls of the south side, the north side and the east side are made of reinforced concrete structures or prefabricated floor slabs, the tank walls of the south side and the north side are vertically arranged, the tank wall of the east side is obliquely arranged to the east, the tank wall of the east side of the west side of the fermentation tank is used as the tank wall of the west side of the fermentation tank, and a stirrer is arranged in the feed tank; preferably, the stirrer consists of a motor, a stirrer shaft, an outer shaft sleeve and a stirring plate, wherein the stirrer shaft is bonded with the motor, the outer shaft sleeve is arranged on the stirrer shaft, and the stirring plate is welded on the outer shaft sleeve in a staggered manner from front to back and from left to right.

The large/ultra-large methane tank suitable for dry continuous fermentation is characterized in that the sunlight room is of a steel structure, a frame is formed by welding steel support columns, three hollow PC sunlight plates A are arranged on the periphery and the top of the frame and used as walls and a ceiling, exhaust holes are formed in the ceiling, the sunlight room transversely spans the feeding tank in the north-south direction, and the steel support columns at the bottom are fixed with the south side wall and the north side wall of the feeding tank; preferably, the south wall of the sunlight room is low, the north wall is high, and the north wall is stuck with a stainless steel mirror panel.

The invention has the advantages that:

(1) the feeding end of the fermentation tank is provided with the feeder with the blade double-roller, so that the dry fermentation continuous feeding is realized, and the discharging end of the fermentation tank is provided with the feeder with the blade double-roller, so that the dry fermentation continuous discharging is realized, and the methane tank disclosed by the invention is suitable for the dry continuous fermentation;

(2) the double-roller feeder with the blades is arranged between the feeding end and the discharging end of the fermentation tank in parallel, so that the materials in the fermentation tank are slowly stirred, and the long-distance feeding is realized, and the methane tank disclosed by the invention can be made into a large/ultra-large methane tank;

(3) the methane tank disclosed by the invention carries out omnibearing three-dimensional temperature rise on the fermentation raw materials in various temperature rise modes, so that the fermentation raw materials are uniformly heated, in addition, the methane tank disclosed by the invention carries out heat preservation on the fermentation raw materials by adopting various heat preservation measures, the heat preservation measures are in place, the heat loss of the fermentation raw materials is effectively reduced, the constant fermentation temperature is ensured, and the volume gas production rate of the methane tank disclosed by the invention is obviously improved (by more than 5 times) because the fermentation raw materials are uniformly heated and the fermentation temperature is constant;

(4) the methane tank disclosed by the invention utilizes sunlight to collect heat, uses solar energy as main heat supply of the methane tank, and is energy-saving and environment-friendly.

Drawings

FIG. 1 is a longitudinal sectional view of a biogas digester;

FIG. 2 is a longitudinal sectional view of the fermenting tank and the heat collecting high temperature water tank;

FIG. 3 is a transverse sectional view of the fermentation tank;

FIG. 4 is a schematic structural view of a base of the fermentation tank and the feeding tank;

FIG. 5 is a schematic view of a twin drum with vanes;

fig. 6 is a schematic view of the construction of the outer sleeve of the shaft and the agitating plate.

The meaning of the reference numerals:

10-a feed tank;

101-a stirrer and 102-a heating water pipe;

1011-stirrer shaft, 1012-shaft outer sleeve and 1013-stirring plate;

20-a fermentation tank;

201-a base, 202-a pool wall, 203-a pool inner jacket water tank, 204-a top plate, 205-a plastic hose with steel wires, 206-a support steel pipe, 207-a circulating coil pipe, 208-a double-roller feeder with blades and 209-a retaining wall;

2011-a sandstone cushion layer, 2012-a reinforced concrete base main body layer, 2013-a heat-insulating waterproof coating layer, 2014-a radiation-proof aluminum foil layer A, 2015-a rock wool board heat-insulating layer, 2016-a mortar layer and 2017-a steel plate layer;

2021-tank wall jacket water tank, 2022-three hollow PC sunshine boards C, 2023-high density XPS extruded foam benzene board, 2024-rock wool board, 2025-plastic board, 2026-protective steel board, 2027-manhole;

2061-transverse supporting steel pipes, 2062-vertical supporting steel pipes;

2081-feeding motor A, 2082-feeding motor B, 2083-roller shaft A, 2084-roller shaft B, 2085-roller A, 2086-roller B, 2087-roller guard plate A, 2088-roller guard plate B, 2089-blade and 2090-fixing plate;

30-sunlight room;

301-steel support column, 302-three hollow PC solar panels A;

40-heat collection high-temperature water tank;

401-a water tank body, 402-I-steel, 403-hot galvanized square steel, 404-toughened glass, 405-three hollow PC sun panels B and 406-a skylight;

501-fermentation tank high-temperature water circulating pump, 502-feeding tank high-temperature water circulating pump, 503-fermentation tank low-temperature water circulating pump, 504-feeding tank low-temperature water circulating pump, 505-stop A, 506-stop B, 507-stop C and 508-stop D.

Detailed Description

The methane tank disclosed by the invention is rectangular, is wide in the north-south direction and long in the east-west direction, can be built into methane tanks with different lengths according to the gas demand, and can be built into underground, semi-aboveground or fully aboveground methane tanks according to the climatic conditions of the construction site.

The invention is described in detail below with reference to the figures and the embodiments.

Referring to fig. 1, 2 and 3, the methane tank disclosed by the present invention comprises: the system comprises a feeding pool 10, a fermentation pool 20, a sunlight room 30, a heat collection high-temperature water tank 40 and an automatic temperature control system, wherein the feeding pool 10 is built on the east, the fermentation pool 20 is built on the west, and the feeding pool and the fermentation pool are integrally built; the sunlight room 30 is built right above the feeding tank 10, and the heat collection high temperature water tank 40 is built right above the fermenting tank 20.

The structure of the five parts of the methane tank will be described in detail below.

First, fermentation vat

Referring to fig. 1, 2 and 3, the fermentation tank 20 is composed of a base 201, a tank wall 202, a tank jacket water tank 203, a top plate 204, a plastic hose with steel wire 205, a support steel pipe 206, a circulating coil 207, a feeder with blade double drums 208, a retaining wall 209 and the like.

1. Foundation

Referring to fig. 4, the base 201 of the fermentation tank 20 is a multi-layer structure, and sequentially comprises from bottom to top: gravel and sand bed course 2011, reinforced concrete base main part layer 2012, thermal-insulated waterproof coating layer 2013, radiation protection aluminium foil layer A2014, rock wool board heat preservation 2015, mortar layer 2016 and steel sheet layer 2017. Wherein:

(1) sand cushion 2011: is formed by mixing and pouring sand, rubble and cement;

(2) reinforced concrete base body layer 2012: the biogas digester is formed by pouring reinforced concrete, wherein the reinforced concrete is poured on the sand and stone cushion 2011, if the height of the biogas digester to be built is not high, the twisted steel bars are bound in a double-layer cross manner, and then the concrete is poured; if the height of the methane tank to be built is higher, the three layers of the twisted steel bars are crosswise bound, and then concrete is poured;

(3) heat-insulating waterproof coating layer 2013: the heat-insulation waterproof coating is coated on the reinforced concrete base main body layer 2012, and the heat-insulation waterproof coating layer 2013 is used for preventing heat in the tank from diffusing to the underground on one hand and preventing underground water from permeating upwards on the other hand (providing a dry environment for an upper heat-insulation material, namely a rock wool board, so as to ensure the heat-insulation effect of the heat-insulation material);

(4) radiation protection aluminum foil layer a 2014: the anti-radiation aluminum foil is laid on the heat-insulation waterproof coating layer 2013, and the anti-radiation aluminum foil layer A2014 is used for preventing the temperature of materials in the tank from dissipating to the ground through radiation, so that the effect of preventing radiation and heat dissipation is achieved;

(5) rock wool board heat preservation 2015: the rock wool plate heat-preservation structure comprises rock wool plates (heat-preservation materials) and ribs, wherein the ribs are formed by pouring reinforced concrete (the ribs can also be prefabricated in advance), the ribs form a plurality of grids on the radiation-proof aluminum foil layer A2014, the rock wool plates are laid in the grids, and the ribs play a role of framework support and are used for preventing materials in a pool from being shriveled and ensuring the heat-preservation effect of the rock wool plates;

(6) mortar layer 2016: the mortar is formed by plastering and leveling mortar, the mortar is plastered on the rock wool board insulating layer 2015, and the mortar layer 2016 is used for preventing the rock wool boards in the rock wool board insulating layer 2015 from being burnt when steel plates are welded;

(7) steel sheet layer 2017: the steel sheet is laid on mortar layer 2016, and the upper surface of steel sheet is brushed with heavy anticorrosive paint, and heavy anticorrosive paint is used for preventing the steel sheet from being corroded by the materials in the pool.

For the heat preservation of the methane tank, the traditional method is to use the foam polystyrene board on the tank wall, but the low-density foam polystyrene board only can reduce convection and conduction heat dissipation, and if the low-density foam polystyrene board is not sealed, the heat preservation effect is not ideal even if the high-density foam polystyrene board is used. As we know, most of heat (about 50%) is radiated by radiation, and the radiation can be greatly reduced by additionally arranging the radiation-proof aluminum foil layer A2014 in the base 201, so that the heat preservation effect of the methane tank is obviously improved, and the constant temperature in the methane tank is further ensured.

Because the heat-insulating waterproof coating layer 2013 is additionally arranged in the base 201, the whole base 201 has good heat-insulating and waterproof effects.

A liquid return hole (not shown) is formed in a base 201 of the fermentation tank 20, a liquid return pipe is installed at the liquid return hole, the other end of the liquid return pipe is communicated with the feeding tank 10 (or the special return tank), and redundant liquid in the fermentation tank 20 flows back into the feeding tank 10 (or the special return tank) through the liquid return pipe and is used for spraying materials, namely straw and excrement, in the feeding tank 10 (or the fermentation tank 20), so that the humidity of the fermentation raw materials is ensured.

2. Pool wall

Referring to fig. 1, 2 and 3, the tank wall 202 of the fermentation tank 20 is composed of a tank wall jacket water tank 2021 and its additional structure. Wherein:

(1) tank wall jacket water tank 2021: the carbon steel plates are welded around the fermentation tank 20, heavy anti-corrosion coatings are sprayed on two sides of the carbon steel plates, the surrounding tank wall jacket water tanks 2021 are sequentially communicated, the lower ends of the tank wall jacket water tanks are directly welded with a steel plate layer of the base 201 (namely, a bottom plate of the fermentation tank 20) in a sealing manner, and hot water in the tank wall jacket water tanks 2021 comes from a heat collection high-temperature water tank 40 above the fermentation tank 20;

(2) an additional structure is as follows: the additional structure is slightly different for different types of methane tanks, specifically:

(i) for a full aboveground methane tank, referring to the aboveground part of fig. 1, the additional structure outside the tank wall jacket 2021 includes: a solar coating layer (not shown) and a three-hollow PC sunlight panel C2022, wherein the solar coating layer is coated on the outer wall of a carbon steel plate at the outer side of the tank wall jacket water tank 2021, the solar coating can absorb infrared rays in sunlight to heat the carbon steel plate, the carbon steel plate transfers heat to water in the tank wall jacket water tank 2021, and finally the tank wall jacket water tank 2021 transfers heat to materials in the fermentation tank 20, so that the materials in the fermentation tank 20 are heated; the three-hollow PC sunlight panel C2022 is arranged on the outer side of the solar coating layer, and the three-hollow PC sunlight panel C2022 has a light-transmitting and temperature-increasing effect and a sealed heat-insulating effect due to the fact that three layers are hollow.

(ii) For underground biogas generating pit, referring to the underground part of fig. 1, the additional structure outside the tank wall jacket 2021 includes: a radiation-proof aluminum foil layer B (not shown), a high-density XPS extruded polystyrene foam plate 2023, a rock wool plate 2024, a plastic plate 2025 and a protective steel plate 2026, wherein the radiation-proof aluminum foil layer B is adhered to the outer wall of the outer side carbon steel plate of the peripheral tank wall jacket water tank 2021, and radiation-proof aluminum foil can reduce the radiation loss of heat in the tank; the high-density XPS compressed foam benzene board 2023 is arranged at the outer sides of the tank wall jacket water tanks at the south side, the north side and the west side, the plastic board 2025 is arranged at the outer side of the high-density XPS compressed foam benzene board 2023 and is fixedly installed with the corresponding outer side carbon steel plate of the tank wall jacket water tank, the plastic board plays a role in corrosion resistance, and after the installation of the plastic board is finished, any part connected with the plastic board at the periphery is sealed by sealant (waterproof protection is well done); the rock wool board 2024 sets up the outside at the pond wall jacket water tank of east side, and the heat in the pond is rarely outwards conducted can be guaranteed to rock wool board 2024, and the effect of protection rock wool board 2024 is played in the outside protection steel sheet 2026 of protection steel sheet 2026 welding at rock wool board 2024.

(iii) For a semi-aboveground biogas digester, referring to fig. 1, additional structure outside the tank wall jacket 2021 includes: solar paint layers (not shown), radiation protection aluminum foil layers B (not shown), high-density XPS extruded polystyrene foam boards 2023, three-hollow PC sunlight boards C2022, plastic boards 2025, rock wool boards 2024 and protective steel boards 2026, wherein, for the overground part of the tank wall, the arrangement and installation of additional structures outside the tank wall jacket water tank 2021 are the same as those of the full-overground methane tank; the arrangement and installation of additional structures outside the tank wall jacket 2021 for the underground portion of the tank wall are the same as for underground biogas tanks.

In order to facilitate the maintenance of the structure inside the fermentation vat 20, access holes 2027 are formed in the lower portions of the south side vat wall and the north side vat wall of the fermentation vat 20.

As a preferable scheme, a plurality of bolt holes are formed in the tank wall jacket water tank 2021, bolts are installed at the bolt holes, a screw penetrates through the bolt holes, a nut is screwed, and then the screw and the nut are hermetically welded with the tank wall jacket water tank 2021, so that the water tightness of the welded part is ensured. The bolts arranged here can ensure that the tank wall jacket water tank 2021 does not sink or rise after being filled with water, i.e. the tank wall jacket water tank 2021 can be prevented from deforming due to the pressure of water, thereby keeping the tank wall jacket water tank 2021 running unchanged.

3. Tank internal jacket water tank

Referring to fig. 2 and 3, the tank inner jacket water tank 203 is the middle layer of the two-connected fermentation tank. The tank inner jacket water tank 203 is formed by welding carbon steel plates, and heavy anti-corrosion paint is sprayed on two sides of each carbon steel plate. The tank inner jacket water tank 203 is arranged inside the fermentation tank 20, is parallel to the south side and the north side tank walls of the fermentation tank 20 and extends along the east-west direction, two ends of the east-west direction are respectively welded with and communicated with the east side and the west side tank walls of the fermentation tank 20, hot water in the tank inner jacket water tank 203 comes from the tank wall jacket water tank 2021 (the hot water in the tank wall jacket water tank 2021 comes from the heat collection high-temperature water tank 40 positioned above the fermentation tank 20), the lower end of the tank inner jacket water tank 203 is welded with the base 201 of the fermentation tank 20 through a plurality of upright posts, the height of the tank inner jacket water tank 203 is determined according to the amount of materials to be filled in the fermentation tank 20, if more materials are to be filled in the fermentation tank 20, the tank inner jacket water tank 203 can be made higher, and if less materials are to be filled in the fermentation tank 20, the tank inner jacket water tank 203 can be made shorter.

The internal jacket water tank 203 of the pool divides the inside of the fermentation pool 20 into two spaces, so that a two-connected fermentation pool is formed, and compared with a single fermentation pool (without the internal jacket water tank 203 of the pool), the two-connected fermentation pool has wider width in the north-south direction and larger material capacity.

4. Top board

Referring to fig. 1 and 2, the top plate 204 of the fermentation tank 20 is located at the upper part of the fermentation tank 20, is horizontally arranged, and is welded with the tank wall jacket water tank 2021 of the fermentation tank 20 at the periphery.

The top plate 204 of the fermentation tank 20 is made of a carbon steel plate coated with a heavy anti-corrosive paint, and the carbon steel plate is provided with a plurality of holes (not shown).

In order to reduce the construction cost, the top plate 204 of the fermentation tank 20 can also be spliced and welded by using leftovers with holes in a mining machinery chain factory.

Biogas generated by fermentation of the material in the fermentation tank 20 is discharged out of the fermentation tank 20 through the holes in the top plate 204, and then discharged into a gas holder (a conventional dry gas holder, not shown) via biogas conduits.

Typically, the material in the fermentation tank 20 is pushed forward, which results in material accumulation. The top plate 204 is horizontally arranged at the upper part of the fermentation tank 20, so that materials can be pushed forwards in a balanced manner, and the materials are prevented from being stacked.

In addition, the top plate 204 can block the materials, so that the heat collection high-temperature water tank 40 can be prevented from scalding the zymocyte mixed in the materials.

5. Plastic hose with steel wire

Referring to fig. 1 and 2, the plastic hose 205 with wire has a plurality of holes drilled thereon, which are uniformly laid on the upper surface of the top plate 204.

When the materials in the fermentation tank 20 are dry, the plastic hose 205 with the steel wire sprays water and the reflowing biogas slurry to the materials in the fermentation tank 20 through the spraying holes on the plastic hose.

6. Support steel pipe

Referring to fig. 1, 2 and 3, the support steel pipes 206 are composed of lateral support steel pipes 2061 and vertical support steel pipes 2062. Wherein:

(1) lateral support steel pipe 2061: a plurality of steel pipes are arranged in the fermentation tank 20 from top to bottom, for a single fermentation tank, two ends of a transverse support steel pipe 2061 are respectively communicated with two tank wall jacket water tanks at the south side and the north side in a welding manner, hot water in the pipe is from the tank wall jacket water tank 2021, for a two-connected fermentation tank, one end of the transverse support steel pipe 2061 is communicated with the tank wall jacket water tank at the south side or the north side in a welding manner, the other end of the transverse support steel pipe is communicated with the tank inner jacket water tank 203 in a welding manner, and the hot water in the pipe is from the tank wall jacket water tank 2021 and the tank inner jacket water tank 203. The transverse support steel pipe 2061 plays a role in supporting the tank wall jacket water tank 2021 and the tank inner jacket water tank 203 in the fermentation tank 20, can prevent the tank wall jacket water tank 2021 and the tank inner jacket water tank 203 from deforming, and plays a role in heating materials inside the fermentation tank 20, so that the materials in the fermentation tank 20 are heated more uniformly.

(2) Vertical support steel pipe 2062: a plurality of transverse support steel pipes 2061 are arranged in the fermentation tank 20, each transverse support steel pipe is welded and communicated with the corresponding transverse support steel pipe 2061, the lower end of each transverse support steel pipe is directly welded with the bottom plate of the fermentation tank 20, the upper end of each transverse support steel pipe 2061 is directly welded with the steel plate with holes of the fermentation tank 20, and hot water in each transverse support steel pipe 2061 comes from the corresponding transverse support steel pipe.

The temperature of the hot water in the supporting steel pipe 206 (comprising the transverse supporting steel pipe 2061 and the vertical supporting steel pipe 2062) is the same as the temperature of the hot water in the tank wall jacket water tank 2021 and the tank inner jacket water tank 203, and the supporting steel pipe 206 and the jacket water tank (comprising the tank wall jacket water tank 2021 and the tank inner jacket water tank 203) heat the materials in the fermentation tank 20 together, thereby realizing the three-dimensional temperature increase and ensuring that the fermentation raw materials are heated uniformly!

7. Circulating coil pipe

Referring to fig. 1, 2 and 3, the circulating coil 207 is disposed at the bottom of the fermenting tank 20, is made of a steel pipe, and is arranged in an "S" shape. The circulating coil 207 is filled with hot water for heating the materials in the fermentation tank 20 (mainly the bottom of the fermentation tank 20) to make the materials uniform in temperature, thereby improving the gas production.

8. Double-roller feeder with blades

Referring to fig. 1, 2, 3 and 5, the double-roller feeder with blades 208 is composed of two feeding motors (feeding motor a2081 and feeding motor B2082), two roller shafts (roller shaft a 2083 and roller shaft B2084), two rollers (roller a 2085 and roller B2086), two roller guards (roller guard a 2087 and roller guard B2088) and a plurality of blades 2089, wherein the blades 2089 are rectangular and have the same length as the roller a 2085 and the roller B2086, the roller guard a 2087 and the roller guard B2088 are arc and have the same length as the roller a 2085 and the roller B2086, the blades 2089 are uniformly and vertically welded on the outer wall of the roller a 2085 and the outer wall of the roller B2086, respectively, and the welding line is parallel to the axial line (i.e. welding along the axial direction), the roller a 2085 is installed on the roller shaft a 2083, the roller B2086 is installed on the roller shaft B2084, the feeding motor A2081 is bonded with one end of the roller shaft A2083, and the feeding motor B2082 is bonded with one end of the roller shaft B2084.

During construction, for a single fermentation tank, two bearing holes are symmetrically formed in the upper part and the lower part of the tank wall on the south side and the north side of the fermentation tank, bearings are installed in the bearing holes, a roller shaft A2083 provided with a roller A2085 and a roller shaft B2084 provided with a roller B2086 are horizontally installed between the tank wall on the south side and the north side through two bearings on the upper part and the lower part respectively, for a two-connected fermentation tank, two bearing holes are symmetrically formed in the tank wall on the south side and the north side of the fermentation tank and on the tank jacket water tank 203 on the upper part and the lower part respectively, bearings are installed in the bearing holes, a roller shaft A2083 provided with the roller A2085 and a roller shaft B2084 provided with the roller B2086 are horizontally installed between the tank wall on the south side and the tank jacket water tank 203 through two bearings on the upper part and the north side respectively, and the other two roller shafts A2083 provided with the roller A2085 and B2084 provided with the roller B2086 are horizontally installed between the tank wall on the north side through two bearings on the tank jacket water tank wall and the tank jacket water tank wall on the other two sides respectively through two bearings on the upper part and the lower part respectively, and the left side And between the pond internal jacket water tank 203, the blade on the cylinder A2085 and the blade on the cylinder B2086 are matched with each other and can be occluded to clamp fermentation materials (straws and excrement), the cylinder protective plate A2087 and the cylinder protective plate B2088 are respectively arranged right above the cylinder A2085 and right below the cylinder B2086, and the two feeding motors (feeding motor A2081 and feeding motor B2082) are arranged on the outer side of the pond wall and are used for driving the two cylinders (cylinder A2085 and cylinder B2086) to rotate.

During operation, start two feeding motor (feeding motor A2081, feeding motor B2082), and make two feeding motor's rotation direction opposite, under two feeding motor's drive, drum A2085 rotates along clockwise, drum B2086 rotates along anticlockwise, and the blade on drum A2085 will interlock with the blade on drum B2086 and carry the material (straw, excrement and urine), along with drum A2085 and drum B2086's continuous rotation, the material is carried away by the clamp towards a direction, and only can be to a direction pay-off, the backward flow is impossible.

A plurality of feeders 208 with blades and double rollers are arranged in the whole fermentation tank 20, and the feeders 208 with blades and double rollers are respectively arranged between the feeding end, the discharging end, the feeding end and the discharging end of the fermentation tank 20, wherein:

the double-roller feeder with blades 208 (equivalent to a feeder) arranged at the feeding end can realize continuous feeding, and the double-roller feeder with blades 208 (equivalent to a discharger) arranged at the discharging end can realize continuous discharging, so the methane tank disclosed by the invention is suitable for dry continuous fermentation;

the quantity of the double-roller feeder with blades 208 (equivalent to a material pushing and stirring device) arranged between the feeding end and the discharging end is determined according to the length of the fermentation tank 20, if the fermentation tank 20 is longer, the quantity of the double-roller feeder with blades 208 arranged between the feeding end and the discharging end is larger, if the fermentation tank 20 is shorter, the quantity of the double-roller feeder with blades 208 arranged between the feeding end and the discharging end is smaller, and the double-roller feeder with blades 208 arranged between the feeding end and the discharging end not only realizes the slow stirring of materials in the fermentation tank 20, but also realizes the long-distance feeding, so the methane tank disclosed by the invention can be made into a large/ultra-large methane tank.

Preferably, a plurality of fixing plates 2090 are uniformly welded on the back surface of each blade 2089 of the feeder 208 with blades and double rollers, and the fixing plates 2090 are made of carbon steel plates and are triangular to prevent the blades 2089 from deforming when the materials are pinched.

The revolution, the blade size and the power of the feeder with blade double-roller 208 are adjusted according to the size of the construction scale of the fermentation tank 20, and specifically, when the construction scale of the fermentation tank 20 is large, the revolution, the blade and the power of the feeder with blade double-roller 208 are all adjusted to be larger; when the scale of the fermentation tank 20 is small, the number of revolutions, blades and power of the double drum feeder with blade 208 are reduced.

9. Protective wall

For semi-underground and underground biogas digesters, the outside of the pool wall is also built with a retaining wall.

For a semi-underground methane tank, referring to fig. 3, the retaining wall 209 is only built at the outer side of the part below the ground of the tank wall, and the feeding motors (a feeding motor A2081 and a feeding motor B2082) of the double-roller feeder 208 with the blades are built into a semi-circle shape to form a pipe well, and the pipe well can facilitate the maintenance of the feeding motors in the later period.

For an underground methane tank, a protective wall is built on the outer side of the whole tank wall, is as high as the tank wall (or higher than the tank wall), and is also built into a semicircular shape at a feeding motor of a double-roller feeder with blades to form a pipe well.

After the retaining wall is built, slag (used for heat preservation) is filled between the retaining wall and the pool wall (except for the position of the pipe well), closed waterproof work is done at the top (namely, a closed waterproof layer is arranged at the top of the slag), and a well cover is installed above the pipe well.

Second, heat collecting high temperature water tank

Referring to fig. 1 and 2, the heat collection high temperature water tank 40 is disposed above the top plate 204 of the fermentation tank 20, the north is high, the south is low (convenient for absorbing sunlight and collecting heat), the inclination angle is 20 to 30 degrees, the south end is 20420cm away from the top plate of the fermentation tank 20 (capable of preventing the heat collection high temperature water tank 40 from scalding dead fermentation bacteria in the fermentation tank), and the periphery of the heat collection high temperature water tank 40 is hermetically welded to the tank wall jacket water tank 2021 of the fermentation tank 20.

The heat collection high-temperature water tank 40 consists of a water tank body 401, I-shaped steel 402, hot galvanizing small square steel 403, toughened glass 404 and three hollow PC solar panels B405.

1. Water tank body

The water tank body 401 is formed by welding hot-dip galvanized steel plates and is in a flat cuboid shape, wherein the hot-dip galvanized steel plates (top steel plates) positioned on the top surface of the water tank body 401 are sprayed with solar coatings (the temperature of the hot-dip galvanized steel plates sprayed with the solar coatings can reach 150-200 ℃ during no-load operation, and the internal water temperature can reach more than 80 ℃ during full load), and meanwhile, a plurality of strip holes are formed in the top steel plates in a segmented mode, and the size of each strip hole is matched with that of the top surface of the I-shaped steel 402.

2. I-steel

The i-beam 402 is disposed inside the tank body 401, and is a support beam for the tank body 401.

The top surface of the I-shaped steel 402 is arranged in the long hole of the steel plate on the top surface of the water tank body 401, and the periphery of the I-shaped steel 402 is welded with the long hole in a full-welding mode, so that the connection mode can prevent the water tank body 401 from being supported and deformed by water in the water tank body 401 under the condition of full water; the bottom surface of the i-shaped steel 402 is welded to a steel plate (bottom surface steel plate) on the bottom surface of the tank body 401 in a section welding manner.

In addition, the vertical surface of the i-beam 402 is opened with a plurality of passage holes for communicating hot water in the tank body 401.

3. Hot-dip galvanized small square steel

The hot-dip galvanized small square steel 403 is totally two-layer from top to bottom, the upper layer single-row is transversely crossed and arranged, the lower layer double-row is transversely crossed and arranged, the upper layer and the lower layer are welded together, the vertical section is in a shape like a Chinese character 'pin', two sides form a step structure, and the whole body is welded on the outer wall of the top steel plate of the water tank body 401 through the lower layer double-row hot-dip galvanized small square steel 403.

4. Tempered glass

The tempered glass 404 is also called universal glass, has high strength, good light transmittance and high temperature resistance, is laid on the upper surface (namely step) of the lower hot galvanized square steel 403, and is sealed by sealant at the periphery.

5. Three-hollow PC sunlight plate

The three-hollow PC sunlight panel B405 is low in heat conduction efficiency and good in heat preservation effect, is laid on the upper layer of hot-galvanized square steel 403, is fixed by a pressing plate and rivet nails after being laid, and all gaps are sealed by sealant to ensure that air cannot enter, so that the light-transmitting and heat-preserving effects are achieved.

The heat collection high temperature water tank 40 is further provided with a skylight 406, the opening position of the skylight 406 is specifically arranged at the upper part (north end) of the heat collection high temperature water tank 40, and an exhaust fan (not shown) is further arranged at the opening position of the skylight 406. Before the fermentation tank 20 is overhauled, the skylight 406 on the heat collection high-temperature water tank 40 is opened, and the exhaust fan is started, so that residual methane and other gases in the fermentation tank 20 are exhausted, and the condition that the people to be overhauled suck is avoided.

III, a feeding tank

Referring to fig. 1, a feed tank 10 is built on the east of a fermentation tank 20 and is integrally constructed with the fermentation tank 20, the base of the feed tank 10 is formed by extending a base 201 of the fermentation tank 20 to the east, the tank walls of the south, north and east sides are made of reinforced concrete structures or prefabricated floor slabs, the tank wall of the east side of the fermentation tank 20 is used as the tank wall of the west side, wherein the tank walls of the south and north sides are both vertically arranged, and the tank wall of the east side is obliquely arranged to the east.

The feed tank 10 is provided with a stirrer 101 and a heating water pipe 102.

1. Mixer

The stirrer 101 is disposed at the discharge port of the feeding tank 10, is located right in front of the feeder 208 with blade double drum at the feeding end of the fermenting tank 20, is parallel to the feeder 208 with blade double drum and is close to the feeder 208 with blade double drum, and the stirrer 101 is used for feeding the feeder 208 with blade double drum, that is, the stirrer 101 is used for feeding.

Referring to fig. 6, as a preferred scheme, the agitator 101 is composed of a motor (not shown), an agitator shaft 1011, a shaft outer sleeve 1012 and an agitation plate 1013, wherein: the shaft 1011 of the agitator is keyed to the motor, the outer sleeves 1012 of the shaft are mounted on the shaft 1011 of the agitator, and the agitating plates 1013 are welded to the outer sleeves 1012 so as to be staggered in the front-rear and left-right directions. The arrangement of the agitating plates 1013 on the outer shaft sleeve 1012 facilitates the direct transfer of solid materials such as straw to the feed inlet of the double roller feeder 208 with blades.

2. Heating water pipe

The heating water pipes 102 are welded and communicated in a cross way in the transverse direction and the vertical direction, and are arranged at the bottom of the feeding tank 10 and the tank walls at the south side, the north side and the east side for heating the materials in the feeding tank 10. The hot water in the heating water pipe 102 is from the heat collecting high temperature water tank 40.

Four, sunshine room

Referring to fig. 1, the sunlight room 30 is made of steel structure, and is welded by steel support columns 301 to form a frame, and three hollow PC sunlight plates a 302 are installed around and on the top of the frame to serve as walls and a ceiling. The sunlight room 30 is constructed on the upper surface of the feeding tank 10 to cross the feeding tank 10 in the north-south direction, and the steel support columns 301 at the bottom are fixed with the south side and the north side tank walls of the feeding tank 10.

1. Wall(s)

The south wall of the sunlight room 30 is low, the north wall is high, and the north wall is pasted with a stainless steel mirror panel (not shown), the stainless steel mirror panel can reflect the sunlight emitted into the sunlight room 30 into the feed tank 10, so as to increase the temperature of the materials in the feed tank 10, when the temperature of the materials in the feed tank 10 is basically consistent with the temperature of the materials in the fermentation tank 20, the fermentation tank 20 can produce the gas without interruption, otherwise, the gas production rate can be reduced, and even the gas production is stopped.

The west wall of the sunlight room 30 is tightly attached to the east wall of the fermentation tank 20, the east wall is arranged at the inner side (west side) of the east wall of the feeding tank 10, and a feeding hole is reserved for the feeding tank 10.

2. Ceiling

The ceiling is inclined in a north-south direction, and the inclination angle is consistent with that of the heat collection high-temperature water tank 40. The ceiling is provided with an exhaust hole (not shown), and the exhaust hole can timely exhaust odor and other harmful gases generated in the storage process of the materials.

Automatic temperature control system

The automatic temperature control system consists of a temperature sensor, a circulating pump, a stop valve and a water temperature control cabinet.

1. Temperature sensor

Temperature sensors (not shown) are installed in the tank body 401 of the heat collecting high temperature water tank 40, the tank wall jacket 2021 of the fermentation tank 20, and the heating water pipe 102 of the feeding tank 10, respectively.

2. Circulating pump

Referring to fig. 1 and 2, the circulating pumps adopt high temperature resistant circulating pumps, and there are four circulating pumps, two of them are respectively installed at the south side and the north side of the fermentation tank 20 and are close to the bottom of the fermentation tank 20, the other two are respectively installed at the south side and the north side of the feeding tank 10 and are close to the bottom of the feeding tank 10, the two circulating pumps located at the north side are high temperature water circulating pumps, respectively counted as a fermentation tank high temperature water circulating pump 501 and a feeding tank high temperature water circulating pump 502, the two circulating pumps located at the south side are low temperature water circulating pumps, respectively counted as a fermentation tank low temperature water circulating pump 503 and a feeding tank low temperature water circulating pump 504. Wherein:

(1) fermentation tank high-temperature water circulating pump 501: a water inlet of the fermentation tank high-temperature water circulating pump 501 is communicated with the heat collection high-temperature water tank 40 through a water pipe A; the water outlet of the fermentation tank high-temperature water circulating pump 501 is connected with two water pipes through a tee joint, which are respectively designated as a water pipe B and a water pipe C, wherein the water pipe B is communicated with a tank wall jacket water tank 2021 of the fermentation tank 20, and the water pipe C is communicated with a circulating coil 207 at the bottom of the fermentation tank 20.

(2) A low-temperature water circulating pump 503 for the fermentation tank: the water inlet of the low-temperature water circulating pump 503 of the fermentation tank is connected with two water pipes through a tee joint, which are respectively counted as a water pipe D and a water pipe E, wherein the water pipe D is communicated with a tank wall jacket water tank 2021 of the fermentation tank 20, and the water pipe E is communicated with a circulating coil 207 at the bottom of the fermentation tank 20; the water outlet of the low-temperature water circulating pump 503 of the fermentation tank is communicated with the heat-collecting high-temperature water tank 40 through a water pipe F.

(3) Feed tank high-temperature water circulation pump 502: the water inlet of the high-temperature water circulating pump of the feeding pool is communicated with the heat collection high-temperature water tank 40 through a water pipe G; the water outlet of the feeding pool high-temperature water circulating pump 502 is communicated with the heating water pipe 102 in the feeding pool 10 through a water pipe H.

(4) Feed tank low temperature water circulating pump 504: the water inlet of the feeding pool low-temperature water circulating pump 504 is communicated with the heating water pipe 102 in the feeding pool 10 through a water pipe J; the water outlet of the feeding pool low-temperature water circulating pump 504 is communicated with the heat collection high-temperature water tank 40 through a water pipe K.

3. Stop valve

Referring to fig. 1 and 2, the gates are installed on the water pipe B, the water pipe C, the water pipe D, and the water pipe E, respectively, and are designated as a gate B, a gate C, a gate D, and a gate E, respectively.

4. Water temperature control cabinet

The aforementioned temperature sensor, the circulating pump and the stop valve are in signal connection with a water temperature control cabinet (not shown), wherein the temperature sensor sends temperature information of water in the water tank and the water pipe to the water temperature control cabinet, and the water temperature control cabinet automatically controls the opening and closing of the circulating pump and the stop valve according to the received water temperature information, so that hot water in the heat collection high-temperature water tank 40 is respectively circulated in the fermentation tank 20 and the feeding tank 10, and the temperature of the fermentation tank 20 and the temperature of the feeding tank 10 are automatically controlled.

(1) Hot water circulation in a fermentation tank

The hot water circulation in the fermentation tank 20, including the hot water circulation in the tank wall jacket water tank 2021 and the hot water circulation in the circulation coil 207, needs to be started separately, wherein:

(i) hot water circulation in the pool wall jacket tank 2021 (see fig. 2): closing a stop valve C on the water pipe C and a stop valve E on the water pipe E, opening a stop valve B on the water pipe B and a stop valve D on the water pipe D, then simultaneously opening a fermentation tank high-temperature water circulating pump 501 and a fermentation tank low-temperature water circulating pump 503, injecting hot water in the heat collection high-temperature water tank 40 into a tank wall jacket water tank 2021 of the fermentation tank 20 through the water pipe A and the water pipe B in sequence under the action of the fermentation tank high-temperature water circulating pump 501, and meanwhile, sending low-temperature water in the tank wall jacket water tank 2021 back to the heat collection high-temperature water tank 40 through the water pipe D and the water pipe F in sequence under the action of the fermentation tank low-temperature water circulating pump 503, thereby completing hot water circulation in the tank wall jacket water tank 2021.

(ii) Hot water circulation in circulation coil 207 (see fig. 2): closing the stop B on the water pipe B and the stop D on the water pipe D, opening the stop C on the water pipe C and the stop E on the water pipe E, then simultaneously opening the high-temperature water circulating pump 501 of the fermentation vat and the low-temperature water circulating pump 503 of the fermentation vat, the hot water in the heat collection high-temperature water tank 40 is injected into the circulating coil 207 at the bottom of the fermentation vat 20 through the water pipe A and the water pipe C in sequence under the action of the high-temperature water circulating pump 501 of the fermentation vat, meanwhile, the low-temperature water in the circulating coil 207 is sent back to the heat collection high-temperature water tank 40 through the water pipe E and the water pipe F in sequence under the action of the low-temperature water circulating pump 503 of the fermentation vat, thereby completing the hot water circulation in the circulating coil 207.

(2) Hot water circulation in the feed tank (see fig. 1): meanwhile, the feeding pool high-temperature water circulating pump 502 and the feeding pool low-temperature water circulating pump 504 are started, hot water in the heat collection high-temperature water tank 40 is injected into the heating water pipe 102 of the feeding pool 10 through the water pipe G and the water pipe H in sequence under the action of the feeding pool high-temperature water circulating pump 502, meanwhile, low-temperature water in the heating water pipe 102 is sent back to the heat collection high-temperature water tank 40 through the water pipe J and the water pipe K in sequence under the action of the feeding pool low-temperature water circulating pump 504, and therefore hot water circulation in the heating water pipe 102 is completed.

In summary, the methane tank disclosed by the invention is provided with the double-roller feeder 208 with the blades at the feeding end of the fermentation tank 20, so that continuous feeding is realized, and the double-roller feeder 208 with the blades is arranged at the discharging end of the fermentation tank 20, so that continuous discharging is realized, and the methane tank disclosed by the invention is suitable for dry continuous fermentation.

In addition, the methane tank disclosed by the invention is provided with a plurality of double-roller feeders 208 with blades in parallel between the feeding end and the discharging end of the fermentation tank 20, so that the materials in the fermentation tank 20 are slowly stirred, and the long-distance feeding is realized, therefore, the methane tank disclosed by the invention can be made into a large/ultra-large methane tank.

In addition, the methane tank disclosed by the invention carries out three-dimensional temperature rise on the fermentation raw materials, so that the fermentation raw materials are uniformly heated, and meanwhile, various heat preservation measures are adopted, so that the heat loss is effectively reduced, and the constant fermentation temperature is ensured, and therefore, the gas volume gas production rate of the methane tank disclosed by the invention is obviously improved by more than 5 times.

In addition, the methane tank disclosed by the invention utilizes sunlight to collect heat, and solar energy is used as main heat supply of the methane tank, so that the energy is saved, and the methane tank is environment-friendly.

The methane tank disclosed by the invention is suitable for producing methane by dry continuous fermentation, and the straw and excrement are used as fermentation raw materials, so that the problem of air pollution caused by burning of crop straw is solved, and the problem of environmental pollution caused by excrement discharged by a farm is also solved. Billions of tons of straws are wasted every year in China, if all the straws are used for producing biogas, 4000 billion cubic biogas can be produced, and 9600 billion degrees of electricity can be produced every year according to the electricity generation of 2.4 degrees per cubic meter. Therefore, the construction of the methane tank disclosed by the invention has very positive significance!

It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the protection scope of the present invention.

Claims

1. The utility model provides a large-scale/super large-scale methane-generating pit suitable for dry process continuous fermentation which characterized in that, the methane-generating pit includes feeding tank (10), fermentation vat (20), sunshine room (30), thermal-arrest high temperature water tank (40) and automatic temperature control system, wherein:

the fermentation tank (20) is cuboid, and comprises: the device comprises a basic base (201), a pool wall (202), a supporting steel pipe (206), a circulating coil pipe (207) and a double-roller feeder (208) with blades, wherein the pool wall (202) consists of a pool wall jacket water tank (2021) and an additional structure which is positioned outside the pool wall jacket water tank and plays a role in heat absorption or/and heat preservation, the pool wall jacket water tank (2021) is positioned around a fermentation pool (20), the surrounding pool wall jacket water tanks (2021) are sequentially communicated, and the lower ends of the surrounding pool wall jacket water tanks are directly welded with the basic base (201) in a sealing way; the supporting steel pipes (206) consist of transverse supporting steel pipes (2061) and vertical supporting steel pipes (2062), the vertical supporting steel pipes (2062) are welded and communicated with the transverse supporting steel pipes (2061), the transverse supporting steel pipes (2061) are welded and communicated with the tank wall jacket water tank (2021), and the supporting steel pipes (206) are integrally and uniformly arranged inside the fermentation tank (20); the circulating coil (207) is arranged at the bottom of the fermentation tank (20); the double-roller feeder (208) with the blades comprises two feeding motors, two roller shafts, two rollers, two roller guard plates and a plurality of blades, wherein the blades are rectangular, the roller guard plates are arc-shaped, the two roller shafts are equal in length to the rollers, the blades are welded on the outer walls of the two rollers along the axis direction respectively, the two rollers are installed on the two roller shafts respectively, the two feeding motors are respectively bonded with the two roller shafts, during construction, the two roller shafts are horizontally installed between the south side and the north side of a fermentation tank respectively through an upper bearing and a lower bearing, the blades on the two rollers can be matched to clamp fermentation materials in an occlusion manner, the two roller guard plates are respectively arranged right above and right below the upper roller and the lower roller, a plurality of double-roller feeders (208) with the blades are arranged in the feeding end of the fermentation tank (20), and the double-roller feeders (208) with the blades are respectively arranged at the feeding end of the fermentation tank (20), The number of the feeders (208) with the blades arranged between the feeding end and the discharging end is determined according to the length of the fermentation tank (20), and the longer the fermentation tank (20) is, the more the feeders (208) with the blades arranged between the feeding end and the discharging end are; for different types of biogas digesters, the additional structure is slightly different, specifically:

for the all-above-ground methane tank, the additional structure comprises a solar coating layer and a three-hollow PC sunlight plate C (2022), wherein the solar coating layer is coated on the outer wall of the outer side carbon steel plate of the tank wall jacket water tank (2021), and the three-hollow PC sunlight plate C (2022) is arranged on the outer side of the solar coating layer;

for an underground methane tank, the additional structure comprises a radiation-proof aluminum foil layer B, a high-density XPS (extruded polystyrene foam) plate (2023), a rock wool plate (2024), a plastic plate (2025) and a protective steel plate (2026), wherein the radiation-proof aluminum foil layer B is pasted on the outer wall of the outer side carbon steel plate of the surrounding tank wall jacket water tank (2021), the high-density XPS (extruded polystyrene foam) plate (2023) is arranged on the outer sides of the tank wall jacket water tanks on the south side, the north side and the west side, the plastic plate (2025) is arranged on the outer side of the high-density XPS (extruded polystyrene foam) plate (2023) and fixedly mounted with the corresponding outer side carbon steel plate of the tank wall jacket water tank, the rock wool plate (2024) is arranged on the outer side of the east side, and the protective steel plate (2026) is welded on the outer side of the rock wool plate (2024);

for a semi-overground methane tank, the additional structure comprises a solar coating layer, a radiation-proof aluminum foil layer B, a high-density XPS extruded polystyrene foam board (2023), a three-hollow PC sunlight board C (2022), a plastic board (2025), a rock wool board (2024) and a protective steel board (2026), wherein for the overground part of the tank wall, the arrangement and installation of the additional structure are the same as those of the full-overground methane tank, and for the underground part of the tank wall, the arrangement and installation of the additional structure are the same as those of the underground methane tank;

the feeding tank (10) is built on the east of the fermentation tank (20) and is integrally built, and a heating water pipe (102) is arranged in the feeding tank (10);

the sunlight room (30) is built right above the feeding pool (10);

the heat collection high-temperature water tank (40) is arranged right above the fermentation tank (20);

automatic temperature control system comprises temperature sensor, circulating pump, valve and water temperature switch board, and wherein, the circulating pump includes: the high-temperature water circulating pump (501) of the fermentation pool, the high-temperature water circulating pump (502) of the feeding pool, the low-temperature water circulating pump (503) of the fermentation pool and the low-temperature water circulating pump (504) of the feeding pool are respectively fed into the pool wall jacket water tank (2021) of the fermentation pool (20), the circulating coil (207) and the heating water pipe (102) of the feeding pool (10) through water pipes, and the low-temperature water in the pool wall jacket water tank (2021), the circulating coil (207) and the heating water pipe (102) is respectively fed back into the high-temperature water collecting tank (40) through other water pipes, the low-temperature water circulating pump (503) of the fermentation pool and the low-temperature water circulating pump (504) of the feeding pool; the temperature sensors are respectively arranged in the heat-collecting high-temperature water tank (40), the tank wall jacket water tank (2021) and the heating water pipe (102); the temperature sensor and the circulating pump are in signal connection with the water temperature control cabinet, the temperature sensor sends water temperature information to the water temperature control cabinet, and the water temperature control cabinet automatically controls the on-off of the circulating pump according to the received water temperature information, so that hot water in the heat collection high-temperature water tank (40) is circulated in the fermenting tank (20) and the feeding tank (10) respectively.

2. The large/ultra-large biogas digester suitable for dry continuous fermentation according to claim 1, characterized in that the fermentation tank (20) further comprises: jacket water tank (203) in the pond, jacket water tank (203) in the pond is formed by the carbon steel plate welding of both sides spraying heavy anticorrosive coating, sets up in the inside of fermentation vat (20), and is parallel with south side and north side pool wall of fermentation vat (20), and the east side and the west side pool wall welding of thing both ends with fermentation vat (20) respectively and communicate with each other, and the lower extreme welds through basic base (201) of a plurality of stands and fermentation vat (20), and two spaces are cut apart into with the inside of fermentation vat (20) in jacket water tank (203) in the pond, form two disjunctor fermentation vats.

3. The large/ultra-large biogas digester suitable for dry continuous fermentation according to claim 1, characterized in that the fermentation tank (20) further comprises: the top plate (204) is made of a porous carbon steel plate coated with heavy anticorrosive paint on the surface, is positioned at the upper part of the fermentation tank (20), and is horizontally welded with a tank wall jacket water tank (2021) of the fermentation tank (20); the plastic hose (205) with steel wires is laid on the top of the top plate (204), and spray holes are drilled on the plastic hose.

4. The large/ultra-large biogas digester suitable for dry continuous fermentation according to claim 1, wherein for semi-underground and underground biogas digesters, a retaining wall (209) is further built outside the part below the ground of the wall of the fermentation tank (20), the retaining wall (209) is built into a semicircular shape at the feeding motor to form a pipe well, except for the pipe well, slag is filled between the outer retaining wall and the tank wall, a closed waterproof layer is arranged at the top of the pipe well, and a well cover is arranged above the pipe well.

5. The large/ultra-large biogas digester applicable to dry continuous fermentation according to claim 1, wherein the base (201) is of a multilayer structure, and comprises, from bottom to top: the building comprises a sandstone cushion layer (2011), a reinforced concrete base body layer (2012), a heat-insulating waterproof coating layer (2013), a radiation-proof aluminum foil layer A (2014), a rock wool board heat-insulating layer (2015), a mortar layer (2016) and a steel plate layer (2017), wherein the rock wool board heat-insulating layer (2015) is composed of rock wool boards and ribs, the ribs are formed by pouring reinforced concrete, a plurality of grids are formed on the radiation-proof aluminum foil layer A (2014), and the rock wool boards are laid in the grids; the upper surface of the steel plate layer (2017) is coated with heavy anti-corrosion paint.

6. The large/ultra-large biogas digester suitable for dry continuous fermentation according to claim 1, wherein the tank wall jacket tank (2021) is equipped with a plurality of bolts for preventing the tank wall jacket tank (2021) from deforming due to water pressure, and the bolts are hermetically welded with the tank wall jacket tank (2021).

7. The large/ultra-large biogas digester applicable to dry continuous fermentation according to claim 1, wherein the heat collection high temperature water tank (40) is composed of a water tank body (401), I-shaped steel (402), hot galvanized small square steel (403), toughened glass (404) and a three-hollow PC sunlight panel B (405), wherein the water tank body (401) is formed by welding hot galvanized steel plates and is in a flat cuboid shape, and the top steel plate is sprayed with solar paint and is also perforated with a plurality of long holes in sections; the I-shaped steel (402) is arranged inside the water tank body (401), the top surface of the I-shaped steel is arranged in the long holes of the top surface steel plate, the periphery of the I-shaped steel is fully welded with the long holes, the bottom surface of the I-shaped steel is welded with the bottom surface steel plate section, and a plurality of channel holes are formed in the vertical surface of the I-shaped steel; the hot-dip galvanized square steel (403) has two layers from top to bottom, the upper layer is arranged in a single row in a transverse cross manner, the lower layer is arranged in a double row in a transverse cross manner, the upper layer and the lower layer are welded together to form a step structure, and the whole body is welded on the top surface steel plate; the tempered glass (404) is laid on the lower layer of hot-galvanized square steel (403), and the three-hollow PC sunlight panel B (405) is laid on the upper layer of hot-galvanized square steel (403);

the heat collection high-temperature water tank (40) is high in north and low in south, the periphery of the heat collection high-temperature water tank is hermetically welded with a tank wall jacket water tank (2021) of the fermentation tank (20), and the north end of the heat collection high-temperature water tank is provided with a skylight (406).

8. The large/ultra-large biogas digester applicable to dry continuous fermentation according to claim 1, characterized in that the base of the feeding tank (10) is formed by extending the base (201) of the fermentation tank (20) to east, the tank walls of the south side, the north side and the east side are made of reinforced concrete structure or prefabricated floor slab, the tank walls of the south side and the north side are vertically arranged, the tank wall of the east side is inclined to east, the tank wall of the east side of the fermentation tank (20) is used as the tank wall of the west side, and the blender (101) is arranged in the feeding tank (10); the stirrer (101) consists of a motor, a stirrer shaft (1011), shaft outer sleeves (1012) and stirring plates (1013), wherein the stirrer shaft is bonded with the motor, the shaft outer sleeves (1012) are installed on the stirrer shaft (1011), and the stirring plates (1013) are welded on the shaft outer sleeves (1012) in a staggered manner from front to back and from left to right.

9. The large/ultra-large biogas digester suitable for dry continuous fermentation according to claim 1, characterized in that the sunlight room (30) is made of steel structure, and is welded by steel support columns (301) to form a frame, three hollow PC sunlight plates A (302) are installed around and on the top of the frame as walls and ceiling, the ceiling is provided with exhaust holes, the sunlight room (30) transversely crosses the feeding tank (10) in the north-south direction, and the steel support columns (301) at the bottom are fixed with the south side and north side tank walls of the feeding tank (10); the south wall of the sunshine room (30) is low, the north wall is high, and the north wall is stuck with a stainless steel mirror panel.