Device for producing biogas with high methane content by utilizing livestock and poultry feces

Patent metadata

Field	Value
Publication number	US-11608482-B2
Application number	US-202016746253-A
Country	US
Kind code	B2
Filing date	Jan 17, 2020
Priority date	Nov 8, 2019
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

The invention discloses a device for producing biogas with high methane content by utilizing livestock and poultry feces, wherein the interior of a tank body of a biogas fermentation tank is divided by a baffle, so as to form a main reaction chamber and an auxiliary reaction chamber which are communicated in upper portions, so that a reactant flows into the auxiliary reaction chamber only after entering the main reaction chamber via a relatively low feeding hole and then reaching a high position of a liquid level, and extension of fermentation time is realized, meanwhile, scales formed at the top of fermentation broth flow into the auxiliary reaction chamber along with liquid, so that the interior of the main reaction chamber keeps a liquid state all the time, and sealing and reduction of quantity of anaerobic bacteria are avoided.

First claim

What is claimed is:

1. A device for producing biogas with high methane content by utilizing livestock and poultry feces, comprising:
a feces collecting pond used for collecting livestock and poultry feces in a unified mode, the feces collecting pond being internally provided with grids for filtering feces,
an acidifying pond connected with the feces collecting pond by a pipeline and used for acidifying livestock and poultry feces, the acidifying pond being internally provided with an agitator, and being externally provided with an automatic doser,
a biogas fermentor connected with the acidifying pond by a pipeline and used for fermenting livestock and poultry feces to produce biogas, the biogas fermentor comprising a tank body, an insulating layer provided on an outer side of the tank body, a heating device buried in the insulating layer, an agitator provided at the lower half portion of the tank body, and a clapboard provided at the upper portion of the tank body and dividing an internal space of the tank body into a main chamber and an auxiliary chamber; the heating device being a warming pipe specifically; upper portions of the auxiliary chamber and the main chamber being in a communicated state and meanwhile lower portions being separated by the clapboard; a biogas residue outlet A being formed in the bottom of the auxiliary chamber, and a biogas slurry outlet being formed in a side wall of the auxiliary chamber; the agitator being capable of agitating reactants in the main chamber intensively when being started; a feeding hole being formed in the other side, opposite to the agitating device, of the tank body, and a biogas opening and a biogas residue outlet B being respectively formed in the top and the bottom of the tank body,
a biogas purifier connected with the biogas opening by a pipeline and used for removing oil, dust and particle impurities in biogas,
a biogas refiner connected with the biogas purifier by a pipeline and used for refining biogas, the biogas refiner comprising at least one biogas membrane treatment device, the biogas membrane treatment device comprising a hollow fibrous membrane in the shape of a wavy line; a biogas inlet, a biogas outlet and an impurity gas outlet being respectively formed in the bottom, the top and the side face of the biogas membrane treatment device,
a biogas compressor connected with a gas outlet of the biogas refining device and used for compressing biogas, and
a biogas storage tank connected with the biogas compressor and used for storing biogas,
each of the above-mentioned pipelines being provided with a power supply and a valve for conveying a target object from a last structure to a next structure.

2. The device for producing biogas with high methane content by utilizing livestock and poultry feces according to claim 1 , wherein the agitator is in a horizontal state, and comprises a frame agitator, an inside agitator provided in the frame agitator, a main motor used for driving the frame agitator, a shaft motor used for driving the inside agitator and a gear motor, the inside agitator being one of the followings: an inclined-blade dual-blade agitator, a straight-blade turbine agitator, and a six-inclined-blade disk turbo agitator.

3. The device for producing biogas with high methane content by utilizing livestock and poultry feces according to claim 1 , wherein the clapboard at least comprises one section of inclined plate, an included angle between the inclined plate and the horizontal plane being 30-60° or 120-150°, and a super-hydrophobic coating being provided on the surface of the inclined plate.

4. The device for producing biogas with high methane content by utilizing livestock and poultry feces according to claim 1 , wherein a second biogas compressor is further provided on a pipeline for connecting the biogas purifying device to the biogas opening, the biogas purifying device comprising an oil removal tank, a water removal tank and a particle filtering tank which are connected end to end in sequence.

Assignees

• Univ South China Tech
• Univ Guangdong Petrochem Tech
• Guangzhou Inst Energy Conversion Cas

Inventors

• Niu Xiaojun
• Lv Mengyu
• Li Xia
• Zhang Li
• Tu Ningyu
• Ye Xingyao
• Zhang Dongqing
• Cheng Lihua
• Guo Huafang

Classifications

• C12M41/24

  inside the vessel · CPC title

• C10L3/102

  of acid contaminants · CPC title

• C05F17/50

  Treatments combining two or more different biological or biochemical treatments, e.g. anaerobic and aerobic treatment or vermicomposting and aerobic treatment · CPC title

• C02F11/12

  by de-watering, drying or thickening · CPC title

• Y02W10/10

  Biological treatment of water, waste water, or sewage · CPC title