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Method and device for deeply removing siloxane from garbage landfill gas/methane

A technology for landfill gas and siloxane, which is applied in gas fuel, petroleum industry, waste fuel, etc., can solve the problems of high cost and high energy consumption, achieve large processing load, simple operating conditions, and siloxane removal. high rate effect

Active Publication Date: 2015-06-17
北京中清绿智科技有限公司
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Problems solved by technology

[0005] Patent CN201110338779.4 "A Device for Stable and Continuous Removal of Siloxane in Combustible Gas" introduces a method and device for removing siloxane in biogas by condensation separation method. This method needs to be carried out at low temperature. Refrigeration requires high energy consumption and high cost

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  • Method and device for deeply removing siloxane from garbage landfill gas/methane

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Embodiment Construction

[0032] Set the siloxane concentration to 120mg / Nm 3 After the landfill gas temperature is controlled at 20°C, it is pressurized by the gas compressor 1 and then passed into the gas-liquid separator 2 to remove water, foam and solid particles; the liquid settles in the lower part of the gas-liquid separator 2, The liquid level control valve 16 is discharged; the solid dirt settles at the bottom of the separator and is discharged through the sewage outlet 18; a defoaming plate 19 is provided in the middle of the separator to eliminate bubbles on the gas-liquid interface to facilitate gas overflow from the liquid; The gas passes through the mist trap 17 to remove the small droplets and then passes through the pressure control valve 15 to the sodium carbonate solution storage tank 3 to remove the hydrogen sulfide in the landfill gas.

[0033] The landfill gas from which water, foam, solid impurities and hydrogen sulfide have been removed is passed through the first control valve 4 int...

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Abstract

The invention belongs to the field of gas separation, and particularly, relates to a method and device for deeply removing siloxane from garbage landfill gas / methane. The garbage landfill gas after pressurization is introduced into a gas-liquid separator and an absorption tank loaded with a sodium carbonate solution, and free water, foams, solid particles and hydrogen sulfide in the landfill gas are removed; the landfill gas obtained after treatment is introduced into a membrane separation treatment unit, and the landfill gas containing D4 and D5 is subjected to membrane separation operation; the mixed gas passes through a hollow fiber membrane contactor of the membrane separation treatment unit, D4 and D5 permeate out from a permeation side under the action of membrane silk internal and external pressure difference and concentration difference and are introduced into an n-hexane organic solvent to be dissolved, and siloxane is recycled; the treated landfill gas containing a small amount of D4 and D5 is introduced into a reaction tank loaded with a dimethyl ketone peroxide solution, and D4 and D5 in the landfill gas are further removed; the treated landfill gas is introduced into a drying tower, water vapor is removed, pure methane gas is obtained, the methane is introduced into a gas storage tank, and the methane gas is stored.

Description

Technical field [0001] The invention belongs to the field of gas separation, and particularly relates to a method and device for removing and recovering methane from octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) in landfill gas. Background technique [0002] The main components of landfill gas (biogas) are methane and carbon dioxide, of which methane is about 45%~50%, and carbon dioxide is 40%~60%. It also contains a small amount of harmful impurities including hydrogen sulfide and siloxane; processed The processed landfill gas can be directly supplied to industrial and greenhouse users. Among them, biogas for heating or industrial production has the highest thermal efficiency; after the landfill gas is collected, it is pressurized by a compressor and sent to the internal combustion engine unit, where it is converted into Electric energy is transmitted to the power booster station and delivered to the local power grid for users; in addition to being used...

Claims

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Application Information

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IPC IPC(8): C10L3/10
CPCY02E50/30
Inventor 李恩田李天洲王树立赵会军
Owner 北京中清绿智科技有限公司
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