CN210419942U

CN210419942U - Biogas generation system capable of recycling biogas slurry

Info

Publication number: CN210419942U
Application number: CN201920902424.5U
Authority: CN
Inventors: 陆立明
Original assignee: Heshan Green Lake Bioenergy Co ltd
Current assignee: Heshan Green Lake Bioenergy Co ltd
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2020-04-28
Anticipated expiration: 2029-06-14

Abstract

The utility model discloses a biogas generation system of cyclic utilization natural pond liquid, including the methane-generating pit that is used for carrying on the fermentation of rich-nitrogen raw materials, the fermentation vat that is used for carrying on the fermentation of rich-carbon raw materials and the planting field that is used for planting the plant that rich-carbon raw materials corresponds, the delivery outlet of methane-generating pit includes marsh gas output tube, natural pond liquid back flow and natural pond liquid irrigation pipe, the end-to-end connection of natural pond liquid back flow the methane-generating pit realizes the backward flow, natural pond liquid irrigation pipe is connected to plant the field, plant the obtained plant of planting field planting is thrown into the fermentation vat, the utility model discloses adopt the fermentation relatively efficient fermentation vat to rich-carbon raw materials to the natural pond liquid, can plant the plant such as grassiness of grassiness in planting field to this regard to the plant the difficult fermented plant of conventional methane-generating pit in the field, utilize the natural pond liquid of methane-generating, zero emission is achieved.

Description

Biogas generation system capable of recycling biogas slurry

Technical Field

The utility model relates to the technical field of methane, in particular to a methane generating system capable of recycling methane liquid.

Background

At present, the recycling mode of a biogas system is roughly divided into two modes in terms of biogas slurry treatment, one mode is that biogas slurry is discharged after reaching standards, namely the biogas slurry reaches the national first-level discharge standard after being treated, and is discharged outwards, and the other mode is that biogas slurry is recycled.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, an object of the present invention is to provide a biogas generation system capable of recycling biogas slurry, which can respectively ferment nitrogen-rich raw material and carbon-rich raw material to form a biogas generation system with high recycling rate.

The utility model provides a technical scheme that its problem adopted is:

a biogas generation system capable of recycling biogas slurry comprises a biogas tank for fermenting nitrogen-rich raw materials, a fermentation tank for fermenting carbon-rich raw materials and a planting field for planting plants corresponding to the carbon-rich raw materials, wherein an output port of the biogas tank comprises a biogas output pipe, a biogas slurry return pipe and a biogas slurry irrigation pipe, the biogas output pipe is connected with external gas utilization equipment, the tail end of the biogas slurry return pipe is connected with the biogas tank to realize backflow, the biogas slurry irrigation pipe is connected to the planting field, plants planted in the planting field are put into the fermentation tank, the fermentation tank comprises a biogas outlet, and the biogas outlet is connected with the biogas output pipe.

Furthermore, the plants planted on the planting field are grassiness.

Further, a main gas valve is arranged on the methane output pipe.

The methane tank further comprises a water pressure chamber for storing the methane liquid, the bottom of the water pressure chamber is communicated with the bottom of the methane tank, a U-shaped pipe and a water pressure pipe close to the U-shaped pipe are arranged in the middle of the water pressure chamber, the bottom end of the water pressure pipe is connected with the bottom of the water pressure chamber, the top of the water pressure pipe is in butt joint with one end of the U-shaped pipe, and the other end of the U-shaped pipe extends into the methane tank.

Further, a water suction pump is arranged at the top end of the water pressure pipe and connected with the biogas slurry irrigation pipe.

Furthermore, a slag discharge pipe and a slag pumping device are arranged at the bottom of the methane tank, the slag pumping device is arranged in the slag discharge pipe, and an output port of the slag discharge pipe is connected with the methane liquid irrigation pipe.

Further, a mixing pool for mixing biogas slurry and biogas residues is arranged between the biogas slurry irrigation pipe and the planting field.

The biogas digester further comprises a bidirectional sleeve for communicating the biogas digester and the fermentation tank, the bidirectional sleeve comprises an outer pipe and an inner pipe, the axes of the outer pipe and the inner pipe are coincident, the radius of the outer pipe is larger than that of the inner pipe, and the outer pipe and the inner pipe are respectively provided with at least one on-off valve for controlling on-off.

The embodiment of the utility model provides an in one or more technical scheme, following beneficial effect has at least: the conventional biogas digester is adopted for the nitrogen-rich raw materials, and the relatively efficient fermentation tank is adopted for the carbon-rich raw materials, so that plants such as elephant grass and the like which are difficult to ferment in the conventional biogas digester can be planted in the planting field, the planting field is irrigated by biogas slurry of the biogas digester, plants harvested in the planting field are put into the fermentation tank, cyclic utilization in the biogas generation system is formed, and zero emission is achieved.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. It should be noted that, if there is no conflict, various features in the embodiments of the present invention may be combined with each other, and all of them are within the scope of the present invention.

The nitrogen-rich raw materials mentioned in the utility model generally refer to human, livestock and poultry manure, and after the full digestion of human and animal gastrointestinal systems, the general particles are fine and contain a large amount of low molecular compounds: the digested intermediates are unabsorbed by humans and animals and contain a relatively high amount of water. Therefore, when the biogas fermentation is carried out, the biogas fermentation does not need to be pretreated, is easy to carry out anaerobic decomposition, generates gas quickly and has short fermentation period. The carbon-rich raw material is usually residues of crops such as straws and the like. The raw materials are rich in cellulose, hemicellulose, pectin, lignin which is difficult to degrade and plant wax, the dry matter content of the raw materials is higher than that of the nitrogen-rich excrement raw materials, the raw materials are loose in texture and small in specific gravity, the raw materials are easy to float after entering a methane tank to form a fermentation death-floating shell layer, and the raw materials are generally pretreated before fermentation. The anaerobic decomposition of carbon-rich raw materials is slower than nitrogen-rich raw materials, and the gas production period is longer, so that a specific microbial fermentation group is required to improve the fermentation period, and the fermentation of the nitrogen-rich raw materials is difficult to synchronize.

Referring to fig. 1, an embodiment of the utility model provides a biogas generation system of cyclic utilization natural pond liquid, including the methane-generating pit 100 that is used for carrying out the fermentation of rich nitrogen raw materials, a fermentation vat 200 that is used for carrying out the fermentation of rich carbon raw materials and a planting field 300 that is used for planting the plant that rich carbon raw materials corresponds, the delivery outlet of methane-generating pit 100 includes marsh gas output tube 110, natural pond liquid return pipe 120 and natural pond liquid irrigation pipe 130, be provided with gaseous main valve 400 on the marsh gas output tube 110, marsh gas output tube 110 connects outside gas appliances, natural pond liquid return pipe 120's end-to-end connection marsh gas 100 realizes the backward flow, natural pond liquid irrigation pipe 130 is connected to planting field 300, planting field 300 plants the gained plant and puts in fermentation vat 200, fermentation vat 200 includes marsh gas outlet 210, marsh gas outlet 210.

In this embodiment, the plants planted in field 300 are grassiness. The elephant grass belongs to a high-energy plant, grows fast, can be quickly supplied to the fermentation tank 200, has higher methane generation amount compared with common straws, and improves the efficiency of the whole methane generation system. Due to the characteristics of the elephant grass, for users with small methane consumption, the planting area of the elephant grass is smaller than that of common plants, and the elephant grass meets the actual requirements of small-sized farmers.

In this embodiment, the biogas digester 100 further comprises a hydraulic chamber 140 for storing biogas slurry, the bottom of the hydraulic chamber 140 is communicated with the bottom of the biogas digester 100, a U-shaped pipe 141 and a hydraulic pipe 142 abutting against the U-shaped pipe 141 are arranged in the middle of the hydraulic chamber 140, the bottom end of the hydraulic pipe 142 is connected to the bottom of the hydraulic chamber 140, the top of the hydraulic pipe 142 is in butt joint with one end of the U-shaped pipe 141, and the other end of the U-shaped pipe 141 extends into the biogas digester 100. The hydraulic pressure room 140 can automatically regulate and control the air pressure in the methane tank 100, because the air pressure in the methane tank 100 is not constant in the fermentation process, the liquid level in the hydraulic pressure pipe 142 rises when the air pressure is higher, the methane at the top of the hydraulic pressure pipe 142 flows into the U-shaped pipe 141 to be stored, when the air pressure is lower, the air pressures at two ends of the U-shaped pipe 141 are inconsistent, and the air pressure towards the section in the methane tank 100 is lower, so the methane liquid in the U-shaped pipe 141 is supplemented into the methane tank 100, and the air pressure in the methane tank 100 is automatically maintained.

On the other hand, a water pump 500 is arranged at the top end of the hydraulic pipe 142, and the water pump 500 is connected with the biogas slurry irrigation pipe 130. The bottom of the methane tank 100 is provided with a slag discharge pipe 600 and a slag pumping device 700, the slag pumping device 700 is arranged in the slag discharge pipe 600, and the output port of the slag discharge pipe 600 is connected with the methane liquid irrigation pipe 130. A mixing pool 800 for mixing biogas slurry and biogas residues is arranged between the biogas slurry irrigation pipe 130 and the planting field 300. Generally speaking, the biogas slurry and the biogas residues are not suitable for irrigating crops when just leaving the tank, the reducibility of the biogas slurry and the biogas residues is strong, oxygen in soil can be strived for with the crops, the germination of seeds and the development of root systems are influenced, meanwhile, the nutrient concentration of the biogas slurry applied singly is low, and the nutrient concentration of the biogas residues applied singly is high, so that the mixing tank 800 is arranged in the embodiment and is used for mixing the biogas slurry and the biogas residues simultaneously, and better fertilizer is obtained by mixing.

Preferably, the biogas digester 100 and the fermentation tank 200 are communicated through a bidirectional sleeve 900, the bidirectional sleeve 900 comprises an outer pipe 910 and an inner pipe 920, the axes of the outer pipe 910 and the inner pipe 920 are coincident, the radius of the outer pipe 910 is larger than that of the inner pipe 920, and the outer pipe 910 and the inner pipe 920 are respectively provided with at least one on-off valve 930 for controlling on-off. Although the types of microorganisms in the biogas digester 100 and the fermentation tank 200 are different, when the liquid level in the biogas digester 100 or the fermentation tank 200 is seriously unbalanced, the on-off valve 930 can be opened to control the two tanks to exchange biogas slurry, and the position between the outer pipe 910 and the inner pipe 920 is fixed by fixing parts, so that the arrangement of the technical personnel in the field can be realized through actual conditions, such as the connection of welded steel bars and the like, which are not detailed herein; in this embodiment, the outer pipe 910 is a pipeline from the methane tank 100 to the fermentation tank 200, and the inner pipe 920 is a pipeline from the fermentation tank 200 to the methane tank 100.

The embodiment of the utility model provides a with the circulation line separation of the circulation line of rich carbon raw materials and rich nitrogen raw materials to utilize natural pond liquid and natural pond sediment in the methane-generating pit 100 of handling rich nitrogen raw materials to throw as fertilizer and plant field 300, because there is the fermentation vat 200 of handling rich carbon raw materials specially in the system, consequently plant field 300 and go up the optional high energy plants such as grassiness, and do not confine edible vegetables to, the embodiment of the utility model provides a need not externally discharge natural pond liquid and natural pond sediment at the circulation in-process, reached the standard of zero release.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the technical effects of the present invention can be achieved by the same means, which all belong to the protection scope of the present invention.

Claims

1. A biogas generation system capable of recycling biogas slurry is characterized in that: the device comprises a methane tank for fermenting nitrogen-rich raw materials, a fermentation tank for fermenting carbon-rich raw materials and a planting field for planting plants corresponding to the carbon-rich raw materials, wherein an output port of the methane tank comprises a methane output pipe, a methane liquid return pipe and a methane liquid irrigation pipe, the methane output pipe is connected with external gas equipment, the tail end of the methane liquid return pipe is connected with the methane tank to realize return flow, the methane liquid irrigation pipe is connected to the planting field, plants planted in the planting field are put into the fermentation tank, the fermentation tank comprises a methane outlet, and the methane outlet is connected with the methane output pipe.

2. The biogas generation system capable of recycling biogas slurry as claimed in claim 1, wherein: the plants planted on the planting field are grassiness.

3. The biogas generation system capable of recycling biogas slurry as claimed in claim 1, wherein: and a main gas valve is arranged on the methane output pipe.

4. The biogas generation system capable of recycling biogas slurry as claimed in claim 1, wherein: the methane tank also comprises a water pressure chamber for storing the methane liquid, the bottom of the water pressure chamber is communicated with the bottom of the methane tank, a U-shaped pipe and a water pressure pipe close to the U-shaped pipe are arranged in the middle of the water pressure chamber, the bottom end of the water pressure pipe is connected with the bottom of the water pressure chamber, the top of the water pressure pipe is in butt joint with one end of the U-shaped pipe, and the other end of the U-shaped pipe extends into the methane tank.

5. The biogas generation system capable of recycling biogas slurry as claimed in claim 4, wherein: the top of hydraulic pressure pipe is provided with the suction pump, the suction pump is connected the natural pond liquid irrigation pipe.

6. The biogas generation system capable of recycling biogas slurry as claimed in claim 5, wherein: the bottom of the methane tank is provided with a slag discharge pipe and a slag pumping device, the slag pumping device is arranged in the slag discharge pipe, and the output port of the slag discharge pipe is connected with the methane liquid irrigation pipe.

7. The biogas generation system capable of recycling biogas slurry as claimed in claim 6, wherein: and a mixing pool for mixing biogas slurry and biogas residues is arranged between the biogas slurry irrigation pipe and the planting field.

8. The biogas generation system capable of recycling biogas slurry as claimed in claim 1, wherein: the biogas digester also comprises a bidirectional sleeve for communicating the biogas digester and the fermentation tank, the bidirectional sleeve comprises an outer pipe and an inner pipe, the axes of the outer pipe and the inner pipe are coincident, the radius of the outer pipe is larger than that of the inner pipe, and the outer pipe and the inner pipe are respectively provided with at least one on-off valve for controlling on-off.