Production process of natural gas by using paddy hull

A production process, natural gas technology, applied in the field of natural gas production using biological materials

Inactive Publication Date: 2009-03-25
浙江格义清洁能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem of economically and effectively utilizing rice husk as a rich resource biological material, the present i

Method used

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  • Production process of natural gas by using paddy hull
  • Production process of natural gas by using paddy hull
  • Production process of natural gas by using paddy hull

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Purchase rice husks from the grain processing factory in Yu'an District, Lu'an City. Its moisture content is about 11%, and its main components are 15% hemicellulose, 35% cellulose, 20% lignin, 18% silica and 12% husk. other ingredients;

[0056] Get 100kg of rice husks, hold the pressure for 180 seconds under the pressure of 1.5MPa, carry out steam explosion in the pulse steam explosion machine, the steam explosion pulse time is 0.00875 seconds, and the pH value of the obtained steam explosion material is 5.5;

[0057] According to the water ratio of 1:5 by weight, add water to the steamed substance for leaching, fully stir, and the leaching time is 10 minutes at room temperature to obtain the leaching substance, and centrifuge the leaching substance to obtain a solid phase and a liquid phase. ;

[0058] Transfer the solid phase to the acid producing tank, add 1:3 water and acid producing bacteria (10%), stir evenly, seal it to produce acid, keep the pH value of the a...

Embodiment 2

[0063] Take 100kg of rice husks and hold the pressure at 2.5MPa for 90s before performing pulse steam explosion. The pulse time of steam explosion is 0.008 seconds, and the resulting pH value is 4.0. Other treatments are the same as in Example 1. The liquid phase starts to produce gas after 12 hours of anaerobic fermentation. The initial daily gas production is 70-90L, and the daily gas production will increase every day. The peak of gas production is from the 7th to the 15th day, and the daily gas production is 2.5m 3 between, and then decrease day by day. After about 10 days, the acid production ended, and the gas production ended in about 30 days, with a total gas production of about 33.2m 3 , The composition of rice husk natural gas is 78.5% methane, 18.2% carbon dioxide, and the rest is impurity gas.

Embodiment 3

[0065] Take 100kg of rice husks and hold the pressure at 4.0MPa for 20s to perform pulse steam explosion. The steam explosion pulse time is 0.006 seconds, and the resulting pH value is 3.5. Other treatments are the same as in Example 1. The liquid phase starts to produce gas after 12 hours of anaerobic fermentation, and the initial daily gas production is 45-50L, and gradually increases every day thereafter. On the 15th-25th day, the daily gas production is 1.0-1.6m 3 After that, it will decrease day by day, and the gas production will end in about 36 days, with a total gas production of about 22.7m 3 , The composition of rice husk natural gas is 72.3% methane, 22.8% carbon dioxide, and the rest is impurity gas. The specific experimental data are shown in the table below.

[0066] Table 2 Data comparison table of three examples

[0067]

[0068]

[0069] According to the above examples, it can be seen that within the range of steam explosion pressure of 1.5MP-4MP and ...

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Abstract

The invention relates to a production technique utilizing rice hulls to produce natural gas, which solves the problem of economically and effectively utilizing the rice hulls which are rich resources and biological materials. The technique of the invention essentially comprises the following steps: 1. Pulse gas explosion is carried out to the rice hulls and more than 90 percent of hemicelluloses in products of gas explosion are hydrolyzed while more than 85 percent of celluloses are isolated and puffed; 2. two-phase anaerobic fermentation is carried out to the products of gas explosion, thus respectively obtaining methane and acid liquor; and 3. desulfurization is carried out to the methane, thus obtaining the natural gas of the rice hulls. The technique of the invention pertains to anaerobic fermentation and has little manpower and low management cost; compared with the biomass heat energy transformation modes, such as cellulosic ethanol, biomass methanol, biological oil, pyrolytic bio-oil, biomass hydrogen production, wheat straw power generation, and the like, the transformable heat energy of biological natural gas is the highest; the technique of the invention pertains to a closed internal recycling system, which is environmentally friendly and has no pollution and high economic benefit.

Description

technical field [0001] The invention relates to a process for producing alternative petroleum fuels, in particular to a process for producing natural gas with biological materials. Background technique [0002] Rice husk is the main by-product of rice processing, accounting for about 20% of the weight of rice grains. my country is the main producer of rice, with an annual output of more than 36 million tons of rice husks. Rice husk is mainly composed of cellulose, hemicellulose, lignin and silica, which has high development value. [0003] However, due to the high lignin and silicon content of rice husk, the fibrous tissue of rice husk is covered with hard silicate, so it is not easy to absorb water and rot. Some researchers have experimented with soaking rice husks in water for several days, and then buried them in the ground for up to 4 years. The rice husks have not completely rotted. Just because rice husk itself has this characteristic, so limit its development and u...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCY02E50/343Y02E50/30
Inventor 管淑清陈存武张莉陈乃富周武
Owner 浙江格义清洁能源技术有限公司
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