NL2032847B1

NL2032847B1 - Combined anaerobic fermentation tank equipment

Info

Publication number: NL2032847B1
Application number: NL2032847A
Authority: NL
Inventors: Liu Jun
Original assignee: Hebei Chengzhi Yangpu New Energy Tech Co Ltd
Priority date: 2022-06-27
Filing date: 2022-08-24
Publication date: 2024-01-16
Also published as: CN217733090U

Abstract

The present invention discloses combined, anaerobic fermentation tank equipment, including a fermentation tank, a gas storage chamber, agitation equipment, a backflow device and detection devices; a top of the fermentation tank is provided with the gas 5 storage chamber; the agitation equipment and the backflow device are arranged in the fermentation tank; the fermentation tank and the gas storage chamber are both provided, with the detection devices; a material inlet and a material outlet are formed in the fermentation. tank; and, the gas storage chamber is communicated 10 with. a cleaning shop. The "integrated, combined, anaerobic fermentation tank" of the present invention provides efficient energy—saving fermentation equipment for biogas engineering.

Description

COMBINED ANAEROBIC FERMENTATION TANK EQUIPMENT

TECHNICAL FIELD

The present invention relates to the technical field of fer- mentation equipment, in particular to combined anaerobic fermenta- tion tank equipment.

BACKGROUND ART

A biogas fermentation tank is a kind of equipment for mechan- ical stirring and fermentation of materials. At present, medium and large-sized biogas fermentation facilities have defects of a large occupation area, high energy consumption, high investment cost, long construction period, low gas production rate and the like.

SUMMARY

The present invention aims to provide combined anaerobic fer- mentation tank equipment, so as to solve the problems in the above prior art, so that the occupation area and cost of biogas fermen- tation equipment are reduced, and the gas production rate is in- creased.

In order to achieve the above purpose, the present invention provides the following solution.

The present invention provides combined anaerobic fermenta- tion tank equipment, including a fermentation tank, a gas storage chamber, agitation equipment, a backflow device and a detection device; a top of the fermentation tank is provided with the gas storage chamber; the agitation equipment and the backflow device are arranged in the fermentation tank; the fermentation tank and the gas storage chamber are both provided with the detection de- vices; a material inlet and a material outlet are formed in the fermentation tank; and the gas storage chamber is communicated with a cleaning shop.

Preferably, at least two fermentation tanks are provided; each fermentation tank includes a bottom plate, a side wall and a sealing membrane; the bottom plate is arc-shaped and attached into a reinforced concrete base; a lower end of the side wall is her- metically connected to an embedded part on the base, and an upper end of the side wall is hermetically connected to the sealing mem- brane.

Preferably, the sealing membrane includes an inner membrane and an outer membrane; the inner membrane is sleeved on an inner side of the outer membrane; and the inner membrane and the outer membrane are both hermetically connected to the side wall.

Preferably, the inner membrane and the outer membrane are both biogas membrane materials; the bottom plate and the side wall are both made of a Q235 material; a thermal insulation layer is arranged on the side wall; and a top of the side wall is provided with a passage which is provided with a railing made of a 304 ma- terial.

Preferably, an inner membrane isolation mesh is arranged at the top of the side wall of each fermentation tank, and the gas storage chamber is formed between the inner membrane isolation mesh and the inner membrane.

Preferably, heating equipment is arranged inside the fermen- tation tank.

Preferably, the agitation equipment is an axial flow type propulsion agitator, and includes two rotating shafts, agitation paddles and speed reduction motors; the two rotating shafts are symmetrically rotatably arranged along a lengthwise direction of the fermentation tank; the agitation paddles are arranged on the two rotating shafts; an outer end of each rotating shaft is con- nected with one speed reduction motor; and a radius of the agita- tion paddle is matched with the fermentation tank.

Preferably, the backflow device is arranged in the fermenta- tion tank.

Preferably, each detection device includes a pressure sensor which is arranged in the gas storage chamber.

The present invention achieves the following technical ef- fects compared to the existing art.

The "integrated combined anaerobic fermentation tank" of the present invention is suitable for materials with high solid con-

tent and high impurity rate, has high fermentation material con- centration, and provides efficient energy-saving fermentation equipment for biogas engineering. The equipment has a simple structure. The top of the fermentation tank is provided with the gas storage chamber, so that the occupation area of a system and the engineering cost are reduced; the construction period is re- duced; and the volumetric gas production rate is greatly in- creased.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to describe the embodiments of the present invention or the technical solutions in the existing art more clearly, draw- ings required to be used in the embodiments will be briefly intro- duced below. Obviously, the drawings in the illustration below are merely some embodiments of the present invention. Those ordinarily skilled in the art also can acquire other drawings according to the provided drawings without doing creative work.

FIG. 1 is a schematic structural diagram of combined anaero- bic fermentation tank equipment of the present invention. 1: fermentation tank; 2: bottom plate; 3: side wall; 4: base; 5: gas storage chamber; 6: inner membrane isolation mesh; 7: em- bedded part; 8: inner membrane; 9: outer membrane; 10: reinforce- ment support; 11: backflow device; 12: rotating shaft; 13: agita- tion paddle; 14: railing; 15: passage.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The technical solutions in the embodiments of the present in- vention will be described clearly and completely below with refer- ence to the drawings in the embodiments of the present invention.

Obviously, the embodiments described herein are only part of the embodiments of the present invention, not all the embodiments.

Based on the embodiments in the present invention, all other em- bodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the pre- sent invention.

In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understanda- ble, the present invention is further described in detail below with reference to the accompanying drawings and specific implemen- tation modes.

As shown in FIG. 1, this embodiment provides combined anaero- bic fermentation tank equipment, including a fermentation tank 1, a gas storage chamber 5, agitation equipment, a backflow device 11 and detection devices. A top of the fermentation tank 1 is provid- ed with the gas storage chamber 5; the agitation equipment and the backflow device 11 are arranged in the fermentation tank 1; the fermentation tank 1 and the gas storage chamber 5 are both provid- ed with the detection devices; a material inlet and a material outlet are formed in the fermentation tank 1; and the gas storage chamber 5 is communicated with a cleaning shop. Gas that has been cleaned in a dehydration and desulfuration cleaning shop is deliv- ered into a boiler or a purification shop, and bio-natural gas is generated by purification or power is generated and delivered to the state grid. After the bio-natural gas is discharged by a screw discharging machine, the bio-natural gas enters a solid-liquid separation system for solid-liquid separation, and obtained biogas residues and biogas slurry can be used for preparing organic solid fertilizer and organic liquid fertilizer; and redundant biogas slurry is returned to a feed end.

The top of the fermentation tank 1 is provided with the gas storage chamber 5, which is key equipment for reducing the occupa- tion area of the system. Biogas produced by anaerobic fermentation is stored in the gas storage chamber 5 at the top, so there is no need to construct additional gas storage equipment and an equip- ment foundation, which reduces the occupation area and also reduce the construction cost of an engineering system. Precast units are assembled, so that the combined anaerobic fermentation tank equip- ment has a simple structure and a short construction period, and is durable, and the construction cost is reduced.

At least two fermentation tanks 1 are provided; each fermen- tation tank 1 includes a bottom plate 2, a side wall 3 and a seal- ing membrane; the arc-shaped bottom plate 2 is attached into a re- inforced concrete base 4; a lower end of the side wall 3 is her- 5 metically connected to an embedded part 7 on the base 4, and an upper end of the side wall is hermetically connected to the seal- ing membrane. The arc-shaped bottom plate 2 is of a straight- through type U-shaped secticnal structure, so that materials do not accumulate easily. In this embodiment, the fermentation tank 1 is a combination of two fermentation tanks 1, or may also be formed by assembling a plurality of bases 4 and fermentation tank units, so that the occupation area is saved, and the land utiliza- tion rate is increased; and meanwhile, the heat dissipation area of the equipment/facility is reduced, and the heating energy con- sumption is reduced. Due to the adoption of a combined structure, when one tank body is in troubleshooting, the other tank body can produce gas normally, so that loss caused by shutdown overhaul is avoided.

The sealing membrane includes an inner membrane 8 and an out- er membrane 9. The inner membrane 8 is sleeved on an inner side of the outer membrane 9, and the inner membrane 8 and the outer mem- brane 9 are both hermetically connected to the side wall 3. The inner membrane 8 and the outer membrane 9 are both biogas membrane materials; the bottom plate 2 and the side wall 3 are both made of a Q235 material; a thermal insulation layer is arranged on the side wall 3; and a top plate used for constructing a passage 15 extends out from the side wall 3. The thermal insulation layer on the side wall 3 and the top plate is a necessary thermal insula- tion measure for the fermentation tank 1. Polyurethane foamed thermal insulation coating is sprayed on the site, and an anti- corrosion corrugated board is laid outside the thermal insulation coating, so that heat loss of materials can be effectively re- duced, and the running energy consumption is thus reduced. The passage 15 is arranged at the top of the side wall 3, so that it is convenient for an operator to overhaul and observe the equip- ment. The passage 15 is provided with a railing 14. The railing 14 is welded to a periphery of the top of the side wall 3 of the fer-

mentation tank 1, and plays a role of safety protection for the operator.

The railing 14 is made of a 304 material which is con- tributive to the corrosion resistance of the railing 14, and the service life is prolonged.

An inner membrane isolation mesh 6 is arranged at the top of the side wall 3 of each fermentation tank 1, and the gas storage chamber 5 is formed between the inner mem- brane isolation mesh 6 and the inner membrane 8. The inner mem- brane isolation mesh 6 is a protection facility for preventing the inner membrane 8 from falling to fermentation material liquid when the gas in the gas storage chamber 5 is insufficient.

The inner membrane isolation mesh 6 of this embodiment is formed by inter- secting ropes made of an acid and alkali-resistant and corrosion- resistant material.

A gas storage space is reserved in the inner membrane 8, without constructing corresponding gas storage equip- ment, so that the overall project investment and the occupation space can be reduced.

In this embodiment, there are two fermenta- tion tanks 1 which share one side wall 3 in the middle.

A rein- forcement support 10 is arranged on the side wall 3 on the outer side, which can protect the tank body from disturbance damage dur- ing dynamic running and plays an irreplaceable role of reinforcing the overall structure of the tank body.

The bottom of the rein- forcement support 10 is welded to the embedded part 7 at the top of the reinforced concrete base 4. The upper part of the rein- forcement support 10 is welded to a designed part of the side wall 3 of the tank body.

An embedded anchor at the bottom of the embed- ded part 7 is welded to built-in structural steel of the rein- forced concrete.

The side wall 3 of the fermentation tank 1 is connected to an arc-shaped plate to form a sealed main body through the embedded part 7. In addition, the reinforcement sup- port 10 is firmly welded on the embedded part 7, so that the over- all structure is more perfect.

The external side wall 3 is formed by a 0235 material and 16# I steel.

From factory machining of a semi-finished product to on-site assembling, the construction speed and the operation efficiency are greatly improved, and the construction period is reduced.

The bottom of the side wall 3 is welded to the embedded part 7, and is subjected to anti-seepage and anti-corrosion treatment; and the upper part of the side wall

3 is welded to a passage board. A wall plate between adjacent fer- mentation tanks 1 is formed by a Q235 plate and double-sided 12# I steel. The reinforced concrete base 4 is an important part for supporting the fermentation tank 1. In this embodiment, there are several curved bases 4, a space between which is not longer than 3.5 m. The base can be reasonably designed according to an actual volume and size of the tank body. The arc-shaped bottom plate 2 may be prefabricated in a factory and then assembled on the site, so that the construction speed and the operation efficiency can be greatly improved, and the construction period can be reduced. The design of an arc-shaped bottom reduces dead corners during materi- al agitation and plays a positive role for full anaerobic fermen- tation of the materials, and anti-corrosion thermal insulation treatment is carried out on exposed surfaces.

The agitation equipment is an axial flow type propulsion agi- tator, and includes two rotating shafts 12, agitation paddles 13 and speed reduction motors; the two rotating shafts 12 are symmet- rically rotatably arranged along a lengthwise direction of the fermentation tank 1; the agitation paddles 13 are arranged on the two rotating shafts 12; an outer end of each rotating shaft 12 is connected with one speed reduction motor; and a radius of the agi- tation paddle 13 is matched with the fermentation tank 1. The agi- tation equipment plays a role of pushing and agitating the anaero- bic fermentation materials, so that there are no dead corners and short flow in the fermentation tank 1 during fermentation, and the materials are fully mixed and fermented. The agitation equipment is made of an anti-wear and anti-corrosion material by a corrosion resistance technology, which achieves dynamic anaerobic fermenta- tion and improves the running efficiency. Two sets of agitation equipment are symmetrically arranged on each fermentation tank 1 in the lengthwise direction in this embodiment. When the equipment at one end fails, the equipment will not stop running, so that the shutdown probability caused by equipment failures is reduced, and the reliability of the system is improved.

Heating equipment is arranged in each fermentation tank 1, which ensures the stability of a fermentation temperature. The backflow device 11 is arranged in the fermentation tank 1, so that the material liquid (bacteria) flows back to a mixing bin, thus improving the activity of fed material inoculums. Fermentation raw materials are inoculated by means of the backflow of the material liquid to accelerate the decomposition of the materials by anaero- bic bacteria and improve the gas production efficiency. The detec- tion device includes a pressure sensor which is arranged in the fermentation tank 1 and the gas storage chamber 5 to detect a pressure of biogas in real time. The heating equipment and the backflow device 11 are common equipment in the art, and specific structures thereof are not repeatedly described.

The anaerobic fermentation tank of this embodiment is equipped with the agitation equipment, the heating equipment and the detection equipment, so that it is an ideal place for fermen- tation of materials. When materials are fermented in a combined anaerobic fermentation chamber, low energy consumption and low in- vestment cost are achieved. The anaerobic fermentation tank body of this embodiment can be into a connected combined structure.

Compared with a traditional structure with a single tank body, the anaerobic fermentation tank body greatly reduces the heat dissipa- tion area of the fermentation materials, achieves an energy saving effect, also reduces the occupation area, and reduces the con- struction cost. The "integrated combined type anaerobic fermenta- tion tank” of this embodiment adopts a high-solid-content dry fer- mentation technology, so that no biogas slurry is produced in the overall running process, and the problem that a large amount of biogas slurry cannot be treated using a common technology is avoided. Any number of anaerobic fermentation tanks 1 can be com- bined (generally the highest cost performance is achieved by com- bining 2, 3, or 4 fermentation tanks) according to a designed dai- ly gas output, and the number is adjusted according to a require- ment. This equipment is suitable for being used in various cli- mates. Particularly in cold areas, the running effect is particu- larly significant, and it is more convenient for promotion and utilization. The efficient and energy-saving fermentation equip- ment is provided for the biogas engineering, so that the construc- tion period is reduced, and the volumetric gas production rate is greatly increased, which is greater than 4 times of the national standard by testing.

The principle and implementation modes of the present inven- tion are described by applying specific examples in the present specification. The descriptions of the above embodiments are only intended to help to understand the method of the present invention and a core idea of the method. In addition, those ordinarily skilled in the art can make changes to the specific implementation modes and the application scope according to the idea of the pre- sent invention. From the above, the contents of the present speci- fication shall not be deemed as limitations to the present inven- tion.

Claims

CONCLUSIONS

CLAIMS 1. Combined anaerobic fermentation tank equipment, characterized in that it includes a fermentation tank, a gas storage chamber, stirring equipment, a backflow device and detection devices, wherein a top of the fermentation tank is provided with the gas storage chamber; the stirring equipment and the return flow device are installed in the fermentation tank; the fermentation tank and the gas storage space are both equipped with detection equipment; a material inlet and a material outlet are formed in the fermentation tank; and the gas storage chamber is connected to a cleaning facility.

2. Combined anaerobic fermentation tank equipment according to claim 1, characterized in that at least two fermentation tanks are provided; wherein each fermentation tank comprises a bottom plate, a side wall and a sealing membrane; the bottom plate is arc-shaped and is fixed in a reinforced concrete base; a lower end of the sidewall is hermetically connected to an embedded portion on the base, and an upper end of the sidewall is hermetically connected to the sealing membrane.

3. Combined anaerobic fermentation tank equipment according to claim 2, characterized in that the sealing membrane comprises an inner membrane and an outer membrane; wherein the inner membrane is enveloped on an inner side of the outer membrane; and the inner membrane and the outer membrane are both hermetically connected to the side wall.

4. Combined anaerobic fermentation tank equipment according to claim 3, characterized in that the inner membrane and the outer membrane are both biogas membrane materials; wherein the bottom plate and the side wall are both made of Q235 material; a thermal insulation layer has been applied to the side wall; and an upper side of the side wall is provided with a passage provided with a railing.

A combined anaerobic fermentation tank equipment according to claim 3, characterized in that an inner membrane insulation mesh is arranged at the top of the side wall of each fermentation tank, and the gas storage chamber is formed between the inner membrane insulation mesh and the inner membrane.

6. Combined anaerobic fermentation tank equipment according to claim 1, characterized in that the heating equipment is arranged within the fermentation tank.

A combined anaerobic fermentation tank equipment according to claim 1, characterized in that the stirring device is an axial flow type propulsive stirrer, and includes two rotating shafts, stirring blades and speed reduction motors; wherein the two rotating shafts are symmetrically arranged for rotation along a longitudinal direction of the fermentation tank; wherein the rudder blades are mounted on the two rotating shafts; wherein one end of each rotating shaft is connected to one speed reduction motor; and wherein a radius of the stirring paddle is matched to the fermentation tank.

8. Combined anaerobic fermentation tank equipment according to claim 1, characterized in that the return flow device is arranged in the fermentation tank.

9. Combined anaerobic fermentation tank equipment according to claim 1, characterized in that each detection device comprises a pressure sensor arranged in the gas storage chamber.