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Process for producing methane by dry-type fermentation of stalks

A dry fermentation and straw technology, which is applied in the fields of fermentation, fertilizers made from biological waste, applications, etc., to achieve the effects of low energy consumption, improved contact, and improved organic load rate and gas production rate.

Inactive Publication Date: 2009-01-07
HENAN FUCHENG ECOLOGICAL ENERGY TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above problems, and develop a process for producing biogas by dry fermentation of straw. The use of it can increase farmers' income and achieve the purpose of energy saving and emission reduction

Method used

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Embodiment 1

[0017] Take experimental engineering 200M 3 Take the anaerobic digester as an example: 300kg of straw is required per day, after pretreatment, continuous feeding, and a daily gas production of 200M at 43-47°C 3 .

[0018] Processing step of the present invention is:

[0019] The first step is to crush 300kg / d straw to 3-6mm with a pulverizer to make straw scraps, so that the straw scraps and microorganisms can fully react, and the degradation rate can reach 90%;

[0020] The second step is to send the straw scraps to the pretreatment pool through the conveyor, and add 43-47 ℃ hot water and straw biogas fermentation agent in the pretreatment pool for pretreatment, and the straw scraps and anaerobic digestion in the pretreatment pool The biogas slurry returned by the device is mixed in a ratio of 2:1 and stirred evenly. After stirring, the solid content of the straw feed liquid is 23-25%;

[0021] The third step is to use a sludge pump to transport the straw feed liquid throu...

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Abstract

The invention provides a technique for producing biogas by utilizing stalk dry fermentation which includes the steps: I, cracking the stalks into 2 to 8mm by a cracking machine; II, transmitting the cracked stalks into a pre-treatment pool, adding hot water of 40 to 53 DEG C and a stalk fermentation agent in the pre-treatment pool to carry out pre-treatment; the cracked stalks and the biogas slurry refluxed by the anaerobic digester of the pre-treatment pool are mixed according to a proportion of 2 to 1; after stirring, the solid content rate of the stalk liquid is 20 to 35 percent; III, using a mud pump to equally transmit the stalk liquid to the top part of the anaerobic digester with a fermentation temperature of 40 to 53 DEG C; IV, the biogas generated by fermentation is purified to be clean fuel by gas-liquid separation. The technique can lead the stalks of 1.5kg to generate the biogas of 1m<3> (the content of methane is larger or equal to 55 percent); the degrading rate is more than 90 percent. The technique of the invention can continuously feed and discharge; the biogas slurry can be repeatedly used; only biogas slag is discharged; the biogas slag is manufactured into organic fertilizer by processing and can not cause any pollution to the environment.

Description

Technical field: [0001] The invention relates to a production process for producing biogas by fermenting straw, in particular to a process for producing biogas by dry fermentation of straw. Biogas is a combustible gas produced by anaerobic digestion of organic matter by microorganisms. Its characteristics are similar to natural gas. In addition to being directly burned for cooking, drying agricultural and sideline products, heating, lighting and gas welding, etc., biogas can also be used as fuel for internal combustion engines and to produce chemical raw materials such as methanol, formalin, and carbon tetrachloride. . Background technique: [0002] There are many kinds of agricultural wastes in my country, but they are divided into two categories according to their sources: straw and poultry manure. my country's agricultural resources are relatively rich. According to the output of my country's main crops through the calculation of grain ratio, the annual output of straw is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C05F5/00
CPCY02E50/343Y02A40/20Y02E50/30Y02W30/40
Inventor 何贵忠何贵新魏秀生
Owner HENAN FUCHENG ECOLOGICAL ENERGY TECH
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