CN112266852A - Biogas slurry purification device and purification method - Google Patents
Biogas slurry purification device and purification method Download PDFInfo
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- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
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Abstract
The invention provides a biogas slurry purification device and a purification method, which relate to the technical field of biogas slurry treatment in biogas engineering, and comprise an aeration device, wherein the aeration device comprises a tank body and a fan arranged below the inner part of the tank body; the filter device comprises a conveyor belt and filter cloth wound on the surface of the conveyor belt and moving along with the conveyor belt, a slurry feeding pipe is arranged above the front end of the conveyor belt, and a hopper for recovering filtered biogas slurry is arranged below the conveyor belt; the biogas slurry after aeration of the aeration device flows onto the filter cloth through the feeding pipe, the biogas slurry flows into the hopper through the filter cloth, the filter residue moves backwards along with the filter cloth, and the filtering device is in a vacuum environment. According to the biogas slurry purification device and purification method provided by the invention, the aerobic pollutant content is reduced through aeration, solid particles are filtered, the viscosity of biogas slurry is reduced, and the gas production is increased.
Description
Technical Field
The invention relates to the technical field of biogas slurry treatment in biogas engineering, in particular to a biogas slurry purification device and a purification method.
Background
At present, along with the gradual importance of the harmless and resource utilization work of agricultural and forestry wastes (straws, livestock and poultry manure and the like) in China, the biogas anaerobic fermentation engineering is in the rapid development period. In the implementation process of biogas engineering, biogas slurry reflux is used as a common method to reduce the discharge of biogas slurry, promote the accumulation of beneficial elements, maintain a proper carbon-nitrogen ratio and the like.
However, the biogas slurry reflux in the current biogas engineering in China has the following problems: 1. the ash content and the content of difficultly decomposed substances in the biogas slurry are accumulated, so that the concentration of the biogas slurry is higher and higher, the feed amount is reduced due to the backflow of the biogas slurry with high solid content, and the biogas production rate of biogas slurry engineering is influenced. 2. The concentration of the biogas slurry is high, the backflow time of the biogas slurry is long, and the activity of methane bacteria is influenced by excessive accumulation of gas production inhibitors, so that the stability of an anaerobic fermentation system and the gas production rate of dry materials are influenced. 3. The long reflux time causes the accumulation of lignin and other viscous substances in the biogas slurry, the viscosity of the biogas slurry is increased, the fermentation tank in the biogas project is easy to foam, and the normal operation of the biogas project and the subsequent treatment of the biogas are affected.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of the prior art, and provide a biogas slurry purification device and a purification method, wherein the aerobic pollutant content is reduced through aeration, solid particles are filtered, the viscosity of biogas slurry is reduced, and the gas production is increased.
In order to achieve the aim, the invention provides a biogas slurry purification device which comprises
The aeration device comprises a tank body and a fan arranged below the inner part of the tank body, biogas slurry flows into the tank body, the fan generates flowing gas, and intermittent aeration is carried out on the biogas slurry;
the filter device comprises a conveyor belt and filter cloth wound on the surface of the conveyor belt and moving along with the conveyor belt, a slurry feeding pipe is arranged above the front end of the conveyor belt, and a hopper for recovering filtered biogas slurry is arranged below the conveyor belt; the biogas slurry after aeration of the aeration device flows onto the filter cloth through the feeding pipe, the biogas slurry flows into the hopper through the filter cloth, the filter residue moves backwards along with the filter cloth, and the filtering device is in a vacuum environment.
Furthermore, four outlets are respectively arranged below the hopper along the moving direction of the conveying belt, each outlet corresponds to a liquid discharge tank, two liquid discharge tanks positioned at the front end of the moving direction of the conveying belt are communicated with the fermentation tank, and the biogas slurry flowing into the fermentation tanks is discharged back into the fermentation tank; the two liquid discharge tanks positioned at the rear end of the moving direction of the conveyor belt reversely discharge the biogas slurry to the rear end of the conveyor belt through the return pipe and spray the biogas slurry on filter residues filtered by the filter cloth.
Furthermore, the upper ends of the four liquid discharge tanks are connected with the same vacuum pump through pipelines, so that the vacuum pump exhausts the liquid discharge tanks.
Furthermore, a washing tank is arranged in the hopper, a roll shaft is arranged in the washing tank, the filter cloth is wound on the roll shaft, so that the filter cloth enters the washing tank, a washing nozzle connected with a high-pressure water pump is arranged in the washing tank, and the washing nozzle carries out reverse washing on the filter cloth.
Furthermore, the tail end of the conveying belt is provided with a filter residue collecting opening, and filter residues filtered by the filter cloth are discharged out of the filtering device from the filter residue collecting opening.
Furthermore, the filter cloth is made of monofilament stainless steel or PVC, and the aperture of the filter cloth is 120-180 mm.
Furthermore, the aeration intensity of the aeration device is 5-10L/(h.L).
Furthermore, the intermittent aeration of the aeration device is 15 minutes, the stop of the aeration is 15 minutes, and the total aeration time is 3 to 6 hours.
The invention also provides a biogas slurry purification method, which comprises the following steps:
s1, introducing the biogas slurry to be filtered into an aeration device for intermittent aeration;
s2, introducing the aerated biogas slurry into a filtering device in a vacuum environment, filtering the biogas slurry by using filter cloth, allowing the biogas slurry to flow into a hopper arranged below the filter cloth, and discharging filter residues from the tail end of the filter cloth to a filter residue collecting port;
s3, four outlets are arranged below the hopper and are respectively communicated with liquid discharge tanks, the two liquid discharge tanks positioned at the front end of the filter cloth moving direction discharge the filtered biogas slurry back to the fermentation tank, and the two liquid discharge tanks positioned at the rear end of the filter cloth moving direction discharge the filtered biogas slurry back to the rear end of the filter cloth and spray the filtered biogas slurry on the filtered filter residue.
Further, in step S1, the aeration intensity of the aeration device is 5 to 10L/(h · L); the intermittent aeration of the aeration device is 15 minutes, the stop is 15 minutes, and the total aeration time is 3-6 hours.
According to the biogas slurry purification device and purification method provided by the invention, the biogas slurry is aerated by the aeration device, the aeration time, the aeration amount and the aeration intensity are controlled to carry out intermittent aeration, the content of gas production inhibitors such as aerobic pollutants is reduced, and the gas production inhibition rate is lower than 5%. And the biogas slurry is filtered by the filtering device, so that the solid with larger volume in the biogas slurry is filtered, the solid content such as sticky substances such as ash, difficultly degraded substances, lignin and the like is intercepted, the solid content of the filtered biogas slurry is reduced by more than 30%, and the viscosity of the filtered biogas slurry is reduced by more than 40%.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following further describes the invention in detail according to the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the filtering apparatus in this embodiment.
The reference numerals in the drawings are explained below.
100. A conveyor belt; 200. filtering cloth; 300. a slurry feeding pipe; 400. a hopper; 500. a liquid discharge tank; 600. a vacuum pump; 700. a washing tank; 710. a roll shaft; 720. and (5) washing the spray head.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "front", "upper", "lower", "left", "right", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides a biogas slurry purification apparatus, which includes an aeration apparatus (not shown in the figure) and a filtering apparatus. The biogas slurry is discharged from the fermentation tank and enters an aeration device for aeration. The raw materials such as straw and the like can generate aerobic pollutants such as COD, BOD and the like after fermentation, and can inhibit gas generation. Aerating the biogas slurry periodically, and introducing oxygen into the biogas slurry to oxidize and decompose the aerobic pollutants. The aerated biogas slurry flows into the filtering device, and the filtering device filters out larger solids in the biogas slurry, so that the biogas slurry concentration is high due to the high solid content of the biogas slurry, the fermentation system is unstable, the feeding amount is small, and the biogas yield is influenced.
The aeration device comprises a large tank body for storing biogas slurry and a fan arranged below the inner part of the tank body. When aeration is carried out, biogas slurry flows into the tank body, then the fan is started, flowing gas is generated by the fan, and intermittent aeration is carried out on the biogas slurry. Specifically, the aeration intensity of the aeration device is 5-10L/(h.L), the intermittent aeration mode of the aeration device is aeration for 15 minutes, the aeration is stopped for 15 minutes, and the total aeration time is 3-6 hours, which depends on the total biogas amount and the biogas slurry concentration. The more the biogas amount is, the thicker the biogas concentration is, and the longer the aeration time is. The aeration rate is as follows according to the volume ratio: the biogas slurry is 30: 1.
The filtering device comprises a conveyor belt 100 and a filter cloth 200 which is wound outside the conveyor belt 100 and moves along with the conveyor belt 100, a slurry feeding pipe 300 is arranged above the front end of the conveyor belt 100, the slurry feeding pipe 300 is connected with a tank body in the aeration device, and the aerated biogas slurry flows onto the filter cloth 200 from the slurry feeding pipe 300. A hopper 400 for recovering the filtered biogas slurry is arranged below the conveyor belt 100, the biogas slurry permeates through the filter cloth 200 and flows into the hopper 400, filter residues are intercepted on the filter cloth 200, and the filter residues are mainly solids such as refractory solids, lignin solids and the like. The filter cloth 200 moves backward by the driving of the conveyor belt 100, and the filter residue moves along with the movement and falls from the end of the conveyor belt 100. It is noted that the present filtration device is performed in a vacuum environment.
Four outlets are respectively arranged below the hopper 400 along the moving direction of the conveyor belt 100, and each outlet corresponds to one liquid discharge tank 500. The two liquid discharge tanks 500 positioned at the front end of the moving direction of the conveyor belt 100 are communicated with the fermentation tank, and the biogas slurry flowing into the fermentation tanks is discharged back to the fermentation tanks for continuous biogas fermentation. The two liquid discharge tanks 500 located at the rear end of the moving direction of the conveyor belt 100 reversely discharge the biogas slurry to the rear end of the conveyor belt 100 through the return pipe, and spray the biogas slurry on the filter residue filtered by the filter cloth 200. Because filter cloth 200 removes the accumulational solid particle in filter cloth 200 top layer more and more, forms the heap layer to influence the permeability and the filter effect of filter cloth 200, through spraying a small amount of natural pond liquid, can effectively improve trafficability characteristic and filter effect.
In this embodiment, the filter cloth 200 is made of monofilament stainless steel or PVC, and the aperture of the filter cloth 200 is 120-180mm, so as to effectively filter relatively large solid particles.
The upper ends of the four drain tanks 500 are connected to the same vacuum pump 600 through pipes, and the inside of the drain tanks 500 is exhausted through the vacuum pump 600. After entering the liquid discharge tank 500, the biogas slurry will continue to produce a small amount of biogas, which needs to be discharged by the vacuum pump 600.
The hopper 400 is internally provided with a washing tank 700, a roller 710 is arranged in the washing tank 700, the filter cloth 200 is wound on the roller 710, so that the filter cloth 200 enters the washing tank 700, a washing nozzle 720 connected with a high-pressure water pump is arranged in the washing tank 700, the washing nozzle 720 is aligned to the back surface of the filter cloth 200, namely the surface away from the filter residue, and the filter cloth 200 is subjected to back washing to wash the filter cloth 200 and wash out solid particles adhered to the filter cloth 200 and blocked on the filter cloth 200.
A residue collection port is provided below the end of the conveyor belt 100, and the residue filtered by the filter cloth 200 is discharged from the filter device through the collection port.
In the embodiment, the biogas slurry is aerated by the aeration device, the aeration time, the aeration amount and the aeration intensity are controlled to carry out intermittent aeration, the content of gas production inhibitors such as aerobic pollutants is reduced, and the gas production inhibition rate is lower than 5%. And the biogas slurry is filtered by the filtering device, so that the solid with larger volume in the biogas slurry is filtered, the solid content such as sticky substances such as ash, difficultly degraded substances, lignin and the like is intercepted, the solid content of the filtered biogas slurry is reduced by more than 30%, and the viscosity of the filtered biogas slurry is reduced by more than 40%.
The embodiment also provides a biogas slurry purification method, which comprises the following steps:
s1, introducing the biogas slurry to be filtered into an aeration device for intermittent aeration treatment. Specifically, the aeration intensity of the aeration device is 5-10L/(h.L); the intermittent aeration of the aeration device is 15 minutes, the aeration is stopped for 15 minutes, and the total aeration time is 3 to 6 hours according to the total biogas amount and the biogas slurry concentration. The more the biogas amount is, the thicker the biogas concentration is, and the longer the aeration time is. The aeration rate is as follows according to the volume ratio: the biogas slurry is 30: 1. The content of gas production inhibitors such as aerobic pollutants and the like is reduced through aeration, and the gas production inhibition rate is lower than 5 percent.
S2, introducing the aerated biogas slurry into a filtering device in a vacuum environment, filtering the biogas slurry by the filtering device, allowing the biogas slurry to flow into a hopper 400 arranged below the filter cloth 200, and discharging the filter residue from the tail end of the filter cloth 200 to a filter residue collecting port. The filter cloth 200 is made of monofilament stainless steel material or PVC material, and the aperture of the filter cloth 200 is 120-180 mm.
S3, four outlets are arranged below the hopper 400 and are respectively communicated with the liquid discharge tanks 500, the two liquid discharge tanks 500 positioned at the front end of the filter cloth 200 in the moving direction discharge the filtered biogas slurry back to the fermentation tank, and the two liquid discharge tanks 500 positioned at the rear end of the filter cloth 200 in the moving direction discharge the filtered biogas slurry back to the rear end of the filter cloth 200 and spray the filtered biogas slurry on the filtered filter residues. Contributing to the improvement of the permeability and filtering ability of the end of the filter cloth 200. The filtering device filters the biogas slurry, so that solids with larger volume in the biogas slurry are filtered, the solid contents such as viscous substances such as ash, difficultly-degraded substances, lignin and the like are intercepted, the solid content of the filtered biogas slurry is reduced by more than 30%, and the viscosity of the filtered biogas slurry is reduced by more than 40%.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A biogas slurry purification device is characterized by comprising
The aeration device comprises a tank body and a fan arranged below the inner part of the tank body, biogas slurry flows into the tank body, the fan generates flowing gas, and intermittent aeration is carried out on the biogas slurry;
the filter device comprises a conveyor belt and filter cloth wound on the surface of the conveyor belt and moving along with the conveyor belt, a slurry feeding pipe is arranged above the front end of the conveyor belt, and a hopper for recovering filtered biogas slurry is arranged below the conveyor belt; the biogas slurry after aeration of the aeration device flows onto the filter cloth through the feeding pipe, the biogas slurry flows into the hopper through the filter cloth, the filter residue moves backwards along with the filter cloth, and the filtering device is in a vacuum environment.
2. The biogas slurry purification device according to claim 1, wherein four outlets are respectively arranged below the hopper along the moving direction of the conveyor belt, each outlet corresponds to a liquid discharge tank, two liquid discharge tanks positioned at the front end of the moving direction of the conveyor belt are communicated with the fermentation tank, and biogas slurry flowing into the fermentation tank is discharged back into the fermentation tank; the two liquid discharge tanks positioned at the rear end of the moving direction of the conveyor belt reversely discharge the biogas slurry to the rear end of the conveyor belt through the return pipe and spray the biogas slurry on filter residues filtered by the filter cloth.
3. The biogas slurry purification device according to claim 2, wherein the upper ends of the four liquid discharge tanks are connected with a vacuum pump through pipelines, so that the vacuum pump exhausts the liquid discharge tanks.
4. The biogas slurry purification device according to claim 1, wherein a washing tank is arranged in the hopper, a roller shaft is arranged in the washing tank, the filter cloth is wound on the roller shaft, so that the filter cloth enters the washing tank, a washing nozzle connected with a high-pressure water pump is arranged in the washing tank, and the washing nozzle performs back washing on the filter cloth.
5. The biogas slurry purification device according to claim 1, wherein a residue collection port is formed at the end of the conveyor belt, and the residue filtered by the filter cloth is discharged from the filter device through the residue collection port.
6. The biogas slurry purification device as claimed in claim 1, wherein the filter cloth is made of monofilament stainless steel or PVC, and the aperture of the filter cloth is 120-180 mm.
7. The biogas slurry purification device according to claim 1, wherein the aeration intensity of the aeration device is 5-10L/(h.L).
8. The biogas slurry purification device according to claim 7, wherein the intermittent aeration of the aeration device is 15 minutes, the stop is 15 minutes, and the total aeration time is 3-6 hours.
9. A biogas slurry purification method is characterized by comprising the following steps:
s1, introducing the biogas slurry to be filtered into an aeration device for intermittent aeration;
s2, introducing the aerated biogas slurry into a filtering device in a vacuum environment, filtering the biogas slurry by using filter cloth, allowing the biogas slurry to flow into a hopper arranged below the filter cloth, and discharging filter residues from the tail end of the filter cloth to a filter residue collecting port;
s3, four outlets are arranged below the hopper and are respectively communicated with liquid discharge tanks, the two liquid discharge tanks positioned at the front end of the filter cloth moving direction discharge the filtered biogas slurry back to the fermentation tank, and the two liquid discharge tanks positioned at the rear end of the filter cloth moving direction discharge the filtered biogas slurry back to the rear end of the filter cloth and spray the filtered biogas slurry on the filtered filter residue.
10. The biogas slurry purification method according to claim 9, wherein in step S1, the aeration intensity of the aeration device is 5-10L/(h.L); the intermittent aeration of the aeration device is 15 minutes, the stop is 15 minutes, and the total aeration time is 3-6 hours.
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| CN202011197326.XA CN112266852A (en) | 2020-10-30 | 2020-10-30 | Biogas slurry purification device and purification method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113248598A (en) * | 2021-05-08 | 2021-08-13 | 德州蓝力生物技术有限公司 | Fish collagen peptide deodorization processing production line |
| CN114988940A (en) * | 2022-05-18 | 2022-09-02 | 安徽悦禾生物科技有限公司 | Organic liquid water-soluble fertilizer and preparation method thereof |
-
2020
- 2020-10-30 CN CN202011197326.XA patent/CN112266852A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113248598A (en) * | 2021-05-08 | 2021-08-13 | 德州蓝力生物技术有限公司 | Fish collagen peptide deodorization processing production line |
| CN113248598B (en) * | 2021-05-08 | 2023-02-03 | 德州蓝力生物技术有限公司 | Fish collagen peptide deodorization processing production line |
| CN114988940A (en) * | 2022-05-18 | 2022-09-02 | 安徽悦禾生物科技有限公司 | Organic liquid water-soluble fertilizer and preparation method thereof |
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