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Method of purifying biogas into natural gas

A bio-natural gas and natural gas technology, applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of complex composition of bio-natural gas and non-compliance with the quality requirements of natural gas for vehicles, achieve significant environmental and ecological benefits, and promote benign development , the effect of promoting circular economy

Inactive Publication Date: 2013-02-06
SUZHOU KETE ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the composition of bio-natural gas produced by anaerobic fermentation of various wastes and wastewater is relatively complex and contains more impurities. Generally, the main components of bio-natural gas are methane (>60%), carbon dioxide (<39%), hydrogen and carbon monoxide (<1 %), trace amounts of hydrogen sulfide, siloxane, oxides and other impurities, which do not meet the quality requirements of natural gas for vehicles, and must be purified before being used as vehicle fuel

Method used

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  • Method of purifying biogas into natural gas

Examples

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Embodiment 1

[0030] The biological natural gas produced by the anaerobic digestion of wastewater is desulfurized first by PDS wet method, washed with lye, and then enters the decarbonization device after desulfurization. Under different pressures and temperatures, CO 2 and CH 4 have different solubilities, CO 2 The solubility is much greater than that of CH 4 , under the working pressure of 0.9MPa absorption tower, choose the appropriate spray water flow rate and temperature to make CH 4 The recovery rate is maximized.

[0031] The raw material gas passes through the filter to remove dust and mechanical impurities. After desulfurization, it is compressed to 0.9MPa (A) in the compressor, cooled to 40°C by the refrigerant, and enters the absorption tower for water washing and separation. The spray water of the absorption tower comes from the chiller, and the bottom water returns to the atmospheric desorption tower to release CO 2 Finally, it is pressurized by the water pump, and the chil...

Embodiment 2

[0035] The biological natural gas produced by the anaerobic digestion of wastewater is desulfurized first by PDS wet method, washed with lye, and then enters the decarbonization device after desulfurization. Under different pressures and temperatures, CO 2 and CH 4 have different solubilities, CO 2 The solubility is much greater than that of CH 4 , select the appropriate working pressure of the absorption tower (0.9MPa) and the flow rate and temperature of the spray water to make CH 4 The recovery rate is maximized.

[0036] The raw material gas passes through the filter to remove dust and mechanical impurities, is compressed to 0.9MPa (A) in the compressor after desulfurization, and is cooled to 35°C by the refrigerant and enters the absorption tower for water washing and separation. The spray water of the absorption tower comes from the chiller, and the bottom water returns to the atmospheric desorption tower to release CO 2 Finally, it is pressurized by the water pump, an...

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Abstract

The invention discloses a method of purifying biogas into natural gas, and is characterized in that after the biogas is subjected to sulfur removal, washing, carbon removal, impurity removal and drying, the content of methane is up to more than 93%, and the biogas reaches standard requirements of the natural gas for vehicles.

Description

technical field [0001] The invention relates to the field of biological natural gas purification, in particular to the technology of treating biological natural gas as fuel for gas vehicles. Background technique [0002] Natural gas is a high-quality, clean and efficient fossil fuel with the lowest carbon emission coefficient among all fossil energy sources. Natural gas has been widely used in various fields of national economic life and production, and currently accounts for about 24% of the world's energy consumption structure. In 2009, my country's natural gas production was 83 billion cubic meters, a year-on-year increase of 7.1%; apparent consumption was 87.45 billion cubic meters, a year-on-year increase of 11.5%. [0003] Compared with domestic production, the gap in domestic natural gas demand is more than 4 billion cubic meters. With the gradual improvement and development of domestic natural gas infrastructure, the demand for natural gas in my country has been ra...

Claims

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Application Information

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IPC IPC(8): C10L3/10
Inventor 马三剑
Owner SUZHOU KETE ENVIRONMENTAL PROTECTION CO LTD
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