CN216039547U

CN216039547U - Anaerobic fermentation tank capable of realizing automatic sand removal function

Info

Publication number: CN216039547U
Application number: CN202121216215.9U
Authority: CN
Inventors: 李光进; 郝雁涛; 吴昊; 王曼
Original assignee: Shanghai Boiler Works Co Ltd
Current assignee: Shanghai Boiler Works Co Ltd
Priority date: 2021-06-01
Filing date: 2021-06-01
Publication date: 2022-03-15
Anticipated expiration: 2031-06-01

Abstract

The utility model relates to an anaerobic fermentation tank capable of realizing an automatic sand cleaning function, which comprises a fermentation tank, wherein the fermentation tank adopts a conical bottom structure, the bottom of the fermentation tank is provided with a sand discharge port, the sand discharge port is connected with an inlet of a sand discharge pump through a sand discharge pipeline, the sand discharge pipeline is provided with a valve for isolation, a stirrer is arranged in the fermentation tank, a sand cleaning pipeline is laid in the conical bottom structure, the sand cleaning pipeline is provided with a plurality of nozzles, the inlet of the sand cleaning pipeline is connected with an outlet of a biogas slurry pump, the outlet pipeline of the biogas slurry pump is provided with a valve for isolation, and the inlet of the biogas slurry pump is connected with a biogas slurry pool. The utility model can realize the automatic sand cleaning function of the anaerobic fermentation tank and avoid manual sand cleaning operation.

Description

Anaerobic fermentation tank capable of realizing automatic sand removal function

Technical Field

The utility model relates to anaerobic fermentation equipment, in particular to an anaerobic fermentation tank capable of realizing an automatic sand removal function.

Background

Livestock and poultry excrement, kitchen garbage and other raw materials can bring debris such as grit into in the wet-type anaerobic fermentation process, and along with the deposit of time, anaerobic fermentation tank bottom can deposit one deck gravel layer to reduce anaerobic fermentation tank effective volume, and lead to anaerobic fermentation tank ejection of compact to block up, agitator trouble scheduling problem.

At present, in domestic biogas engineering, a bottom sand discharge screw is mainly adopted for solving the problem of sand removal of a fermentation tank, or a sand discharge pump is adopted for directly extracting sediments from the bottom of an anaerobic fermentation tank. The sand discharge spiral system is complex, the equipment is huge, the maintenance is difficult, and the investment is high. The scheme that directly adopts the sand discharge pump to extract, the easy stifled knot of sand discharge pump entry pipeline to lead to the sand discharge pump idle running, and then influence the life of sand discharge pump, the grit of bottom also can not get fine clearance. At present, automatic sand removing devices cannot be well utilized, and actual engineering mainly adopts a method of manual sand removing to regularly clean a fermentation tank. The manual sand removal period is long, the workload is large, and certain safety hazard is easily caused to sand removal workers.

Disclosure of Invention

The utility model aims to provide an anaerobic fermentation tank capable of realizing an automatic sand cleaning function, which can realize the automatic sand cleaning function of the anaerobic fermentation tank and avoid manual sand cleaning operation.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the utility model provides an anaerobic fermentation tank that can realize automatic sand removal function, includes the fermentation cylinder, the fermentation cylinder adopts awl end structure, and the bottom sets up the sand discharge mouth, the sand discharge mouth links to each other with the sand discharge pump entry through the sand discharge pipeline, set up the valve for the isolation on the sand discharge pipeline, set up the agitator in the fermentation cylinder, lay the sand removal pipeline in the awl end structure, set up a plurality of nozzles on the sand removal pipeline, sand removal pipeline entry links to each other with the natural pond liquid pump export, sets up the valve for the isolation on the natural pond liquid pump export pipeline, natural pond liquid pump entry links to each other with natural pond liquid pond.

Further, the outlet of the sand discharge pump is connected with the grit chamber through a pipeline.

Further, the slope of the cone bottom in the cone bottom structure is 3-15 degrees.

Furthermore, the number of the sand cleaning pipelines at the bottom of the fermentation tank is 4, 6, 8 or 12, the sand cleaning pipelines are symmetrically arranged in the circumferential direction, and the interval angle is 90 degrees, 60 degrees, 45 degrees or 30 degrees.

Furthermore, the direction of the nozzles on the sand cleaning pipeline is slightly downward along the circumferential direction, and the nozzles are uniformly arranged in a clockwise or anticlockwise direction and are consistent with the rotating direction of the stirrer.

Furthermore, a back flushing pipeline is arranged on the sand discharge pipeline at the bottom of the fermentation tank, and a valve for isolation is arranged on the back flushing pipeline.

Furthermore, a pressure gauge is arranged on the sand discharge pipeline at the bottom of the fermentation tank.

Further, a high material level switch and a low material level switch are arranged on the wall of the fermentation tank.

Furthermore, a transparent observation hole is formed in the wall of the fermentation tank.

Compared with the prior art, the utility model has the beneficial effects that:

1. the automatic sand removing function can be realized, and the manual sand removing during the shutdown is avoided.

2. Set up the back flush on the sand discharge pipeline, avoid the sand discharge pipeline to block up, extension sand discharge pump life.

3. The sand discharge pipeline is provided with a pressure gauge, and whether the sand discharge pipeline is blocked or not and the sand deposit in the fermentation tank is roughly thick can be judged according to the pressure change.

4. The fermentation tank adopts the conical bottom arrangement, can improve the mobility of grit to reach better sand removal effect.

5. The fermentation tank bottom sand removal pipeline and the stirrer act together, so that sand and biogas slurry can be completely mixed, a rotational flow effect is formed, and sand and gravel can be discharged from the sand discharge port.

Drawings

FIG. 1 is a schematic diagram of an anaerobic fermentation tank capable of realizing an automatic sand cleaning function according to the utility model.

Detailed Description

The utility model is further described with reference to the following figures and examples.

This embodiment provides an anaerobic fermentation tank capable of realizing automatic sand removal, as shown in fig. 1, which includes: the device comprises a fermentation tank 1, a stirrer 2, a low material level switch 3, a high material level switch 4, an observation hole 5, a sand cleaning pipeline 6, a biogas slurry tank 7, a biogas slurry pump 8, a first isolation valve 9, a second isolation valve 10, a pressure gauge 11, a third isolation valve 12, a sand discharge pump 13, a grit chamber 14, a sand discharge pipeline T1, a biogas slurry pipeline T2 and a backwashing pipeline T3.

Fermentation cylinder 1 adopts the awl end to arrange, the bottom sets up the sand discharge mouth, the sand discharge mouth links to each other with 13 entrys of sand discharge pump through sand discharge pipeline T1, set up isolation on sand discharge pipeline T1 and use third isolation valve 12, set up agitator 2 in the fermentation cylinder 1, sand removal pipeline 6 is laid at the tank bottoms, set up a plurality of nozzles on sand removal pipeline 6, sand removal pipeline 6 entry links to each other with the export of natural pond liquid pump 8 through natural pond liquid pipeline T2, set up isolation on the natural pond liquid pump 8 outlet pipeline and use first isolation valve 9, natural pond liquid pump 8 entry links to each other with natural pond liquid pond 7.

Preferably, the outlet of the sand discharge pump 13 is connected with the grit chamber 14 through a pipeline.

Preferably, the slope of the conical bottom of the fermentation tank 1 is 3-15 degrees.

Preferably, the number of the sand cleaning pipelines 6 at the bottom of the fermentation tank is 4, 6, 8 or 12, and the sand cleaning pipelines are symmetrically arranged according to the circumferential direction, and the interval angle is preferably 90 degrees, 60 degrees, 45 degrees or 30 degrees.

Preferably, the plurality of nozzles on the sand cleaning pipeline 6 at the bottom of the fermentation tank are arranged slightly downwards along the circumferential direction and are uniformly arranged in a clockwise or anticlockwise direction, and the rotating direction of the stirrer is consistent.

Preferably, a back flushing pipeline T3 is arranged on the sand discharge pipeline T1 at the bottom of the fermentation tank, and a second isolation valve 10 for isolation is arranged on the back flushing pipeline T3.

Preferably, a pressure gauge 11 is arranged on the sand discharge pipeline T1 at the bottom of the fermentation tank.

Preferably, a high level switch 4 and a low level switch 3 are arranged on the wall of the fermenter 1.

Preferably, the fermenter 1 is provided with a transparent viewing port 5 in the wall.

A sand cleaning period is set according to the sand content of the raw material, for example, one year, the sand cleaning is started, the liquid level in the fermentation tank 1 is controlled between a low material level switch 3 and a high material level switch 4 in the fermentation tank 1, and the stirrer 2 is started. After the biogas slurry is pressurized by a biogas slurry pump 8 from a biogas slurry tank 7, a first isolation valve 9 and a second isolation valve 10 are opened, a sand discharge pipeline T1 is backwashed by a backwash pipeline T3, a third isolation valve 12 is opened after the pressure of a pressure gauge 11 is stabilized, and a sand discharge pump 13 is started. The sand is changed from a deposition state to a suspension state in the fermentation tank 1 through the combined action of the stirrer 2 and the sand cleaning pipeline 6, flows through the sand discharge pump 13 through the sand discharge pipeline T1, is pressurized in the sand discharge pump 13, and then flows into the grit chamber 14. The observation hole 5 is used as an auxiliary function for observing the sand cleaning effect in the fermentation tank 1.

Claims

1. The utility model provides an anaerobic fermentation tank that can realize automatic sand removal function, includes the fermentation cylinder, its characterized in that: the fermentation cylinder adopts awl end structure, and the bottom sets up the sand discharge mouth, the sand discharge mouth passes through the sand discharge pipeline and links to each other with the sand discharge pump entry, set up the valve for the isolation on the sand discharge pipeline, set up the agitator in the fermentation cylinder, lay the sand removal pipeline in the awl end structure, set up a plurality of nozzles on the sand removal pipeline, sand removal pipeline entry links to each other with the natural pond liquid pump export, sets up the valve for the isolation on the natural pond liquid pump export pipeline, natural pond liquid pump entry links to each other with the natural pond liquid pond.

2. The anaerobic fermentation tank capable of realizing automatic sand removal function according to claim 1, characterized in that: and the outlet of the sand discharge pump is connected with the grit chamber through a pipeline.

3. The anaerobic fermentation tank capable of realizing automatic sand removal function according to claim 1, characterized in that: the slope of the cone bottom in the cone bottom structure is 3-15 degrees.

4. The anaerobic fermentation tank capable of realizing automatic sand removal function according to claim 1, characterized in that: the number of the sand cleaning pipelines at the bottom of the fermentation tank is 4, 6, 8 or 12, the sand cleaning pipelines are symmetrically arranged in the circumferential direction, and the interval angle is 90 degrees, 60 degrees, 45 degrees or 30 degrees.

5. The anaerobic fermentation tank capable of realizing automatic sand removal function according to claim 1, characterized in that: the sand cleaning pipeline at the bottom of the fermentation tank is provided with a plurality of nozzles, the direction of the nozzles is slightly downward along the circumferential direction, the nozzles are uniformly arranged in a clockwise or anticlockwise direction, and the rotating direction of the nozzles is consistent with that of the stirrer.

6. The anaerobic fermentation tank capable of realizing automatic sand removal function according to claim 1, characterized in that: the fermentation tank bottom sand discharge pipeline is provided with a back flushing pipeline, and the back flushing pipeline is provided with a valve for isolation.

7. The anaerobic fermentation tank capable of realizing automatic sand removal function according to claim 1, characterized in that: and a pressure gauge is arranged on a sand discharge pipeline at the bottom of the fermentation tank.

8. The anaerobic fermentation tank capable of realizing automatic sand removal function according to claim 1, characterized in that: and a high material level switch and a low material level switch are arranged on the wall of the fermentation tank.

9. The anaerobic fermentation tank capable of realizing automatic sand removal function according to claim 1, characterized in that: and the wall of the fermentation tank is provided with a transparent observation hole.