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Method for preparing biological natural gas from marsh gas

A technology of natural gas and biogas, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of limited use, low use value, and the work of biogas concentration has not been carried out, so as to increase the scope of use, increase the price, and increase the use value Effect

Inactive Publication Date: 2010-06-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, domestic biogas is only used as fuel for rural stoves, which is not widely used and has low use value. Biogas enrichment work has not yet been carried out. Biogas enrichment is just in its infancy. With the development of renewable energy being highly valued, biogas purification is made into bio-natural gas , expanding the use of biogas has also received attention

Method used

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  • Method for preparing biological natural gas from marsh gas
  • Method for preparing biological natural gas from marsh gas
  • Method for preparing biological natural gas from marsh gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 2 As shown, the biogas is pressurized to 0.35mpa with compressor 1, and enters the absorption tower 2 (biogas volume 100m 3 / h), use the circulating pump 3 to send the lean liquid in the lean liquid tank 4 to the top of the absorption tower and spray it down, and the biogas is in countercurrent contact with the absorbent-ethanolamine solution from the bottom up to absorb the CO 2 、H 2 S, from the top of the absorption tower is the purified bio-natural gas.

[0027] The rich liquid from the absorption tower enters the desorption tower 6 after heat exchange by the heat exchanger 5, and the desorption liquid at the bottom of the desorption tower is heated to 105-115°C by the heater 8, and the rich liquid decomposes in the desorption tower to release CO 2 、H 2 S, the lean solution after analysis is cooled by heat exchange, and then cooled with water to below 35°C for recycling. The monoethanolamine solution is a monoethanolamine aqueous solution with a m...

Embodiment 2

[0029] The biogas is pressurized to 0.7mpa with compressor 1, and enters the absorption tower 2 (biogas volume 100m 3 / h), use the circulating pump 3 to send the lean liquid in the lean liquid tank 4 to the top of the absorption tower and spray it down, and the biogas is in countercurrent contact with the absorbent-ethanolamine solution from the bottom up to absorb the CO 2 、H 2 S, from the top of the absorption tower is the purified bio-natural gas.

[0030] The rich liquid from the absorption tower enters the desorption tower 6 after heat exchange by the heat exchanger 5, and the desorption liquid at the bottom of the desorption tower is heated to 105-115°C by the heater 8, and the rich liquid decomposes in the desorption tower to release CO 2 、H 2 S, the lean solution after analysis is cooled by heat exchange, and then cooled with water to below 35°C for recycling. The monoethanolamine solution is a monoethanolamine aqueous solution with a mass percentage concentration o...

Embodiment 3

[0032] The biogas is pressurized to 0.5mpa with the compressor 1, and enters the absorption tower 2 (the biogas volume is 500m 3 / h), use the circulating pump 3 to send the lean liquid in the lean liquid tank 4 to the top of the absorption tower and spray it down, and the biogas is in countercurrent contact with the absorbent-ethanolamine solution from the bottom up to absorb the CO 2 、H 2 S, from the top of the absorption tower is the purified bio-natural gas.

[0033] The rich liquid from the absorption tower enters the desorption tower 6 after heat exchange by the heat exchanger 5, and the desorption liquid at the bottom of the desorption tower is heated to 105-115°C by the heater 8, and the rich liquid decomposes in the desorption tower to release CO 2 、H 2 S, the lean solution after analysis is cooled by heat exchange, and then cooled with water to below 35°C for recycling. The monoethanolamine solution is a monoethanolamine aqueous solution with a mass percent concent...

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Abstract

The invention relates to a method for preparing biological natural gas from marsh gas. The method is characterized in that marsh gas is compressed to 0.35-0.7MPa and then enters an absorption tower; in the absorption tower, the marsh gas from bottom to top has a countercurrent contact with a monoethanolamine solution used as an absorbent from top to bottom to absorb CO2 and H2S; gas coming out of the top of the absorption tower is purified biological natural gas; and rich liquor coming out of the absorption tower is heated to 11-125 DEG C through a heater and then decomposed in a decomposing tower to release the CO2 and the H2S, wherein the pressure of the absorption tower is 0.35-0.7MPa, the temperature is normal temperature, and the temperature of the decomposing tower is 105-110 DEG C. The method utilizes the excellent absorbent (monoethanolamine) with a large solubility to absorb the carbon dioxide and the sulfide in the marsh gas so as to remove the carbon dioxide and impurities in the marsh gas, ensures that the content of methane is improved to be higher than 95 percent, and meets the requirement on components of the natural gas, thus the obtained natural gas prepared by the method is called biological natural gas. The method enlarges the application of the marsh gas, improves the use value of the marsh gas, and has obvious economic, social and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of new energy utilization, in particular to a method for producing natural gas from biogas. Background technique [0002] The ecological mode of biogas fermentation, which mainly deals with livestock and poultry manure, straw and agricultural waste, is one of the important contents of the development of ecological agriculture in my country. In recent years, my country's rural biogas construction has intensified, and the biogas industry has ushered in unprecedented development. Rural biogas construction has become an energy project for a resource-saving society. [0003] The direct product of rural biogas construction is biogas, which is a combustible mixed gas produced by microorganisms, and its main component is methane (CH 4 ), the content of methane in biogas is 50-75%; followed by carbon dioxide (CO 2 ), 25 to 45%; in addition, there are other gases, such as hydrogen sulfide, carbon monoxide, nitrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 宁平殷在飞王学谦
Owner KUNMING UNIV OF SCI & TECH
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