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A method and device for removing siloxane in landfill gas/biogas

A technology of gas siloxane and landfill gas, applied in separation methods, chemical instruments and methods, gas fuels, etc., can solve the problems of high cost and high energy consumption, achieve large processing load, simple operating conditions, and optimize energy structure Effect

Active Publication Date: 2017-02-22
北京中清绿智科技有限公司
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  • Description
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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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  • A method and device for removing siloxane in landfill gas/biogas

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Embodiment Construction

[0030] The siloxane concentration is 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 separator and is controlled by the liquid level. The valve 16 discharges; the solid dirt settles at the bottom of the gas-liquid separator 2, and is discharged through the sewage outlet 18; the middle part of the separator is provided with a defoaming plate 19, which is used to eliminate the air bubbles on the gas-liquid interface, so as to facilitate the overflow of gas from the liquid; After the gas passes through the mist catcher 17 to remove small mist droplets, it passes through the pressure control valve 15 into the sodium carbonate solution tank 3 to remove hydrogen sulfide in the landfill gas.

[0031] The landfill gas from which water, foam, solid impurities and hydrogen sulfide have been r...

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Abstract

The invention belongs to the field of gas separation, and particularly, relates to a method and device for removing siloxane in garbage landfill gas. The garbage landfill gas after pressurization is introduced into a gas-liquid separator, and free water, foams and solid particles in the landfill gas are removed; the landfill gas obtained after treatment in the step 1) is introduced into an absorption tank loaded with a sodium carbonate solution, and hydrogen sulfide in the landfill gas is removed; the landfill gas obtained after treatment in the step 2) is introduced into a membrane separation treatment unit, and the landfill gas containing siloxane is subjected to membrane separation operation; the mixed gas passes through a hollow fiber membrane contactor of the membrane separation treatment unit, siloxane permeates out from a permeation side under the action of membrane silk internal and external pressure difference and concentration difference and then is introduced into an n-hexane organic solvent to be dissolved, and siloxane is recycled; the tail gas obtained after treatment in the step 3) is introduced into a drying tower filled with calcium chloride, water vapor carried by methane gas is removed, and then the methane gas goes into a gas storage tank and is stored.

Description

technical field [0001] The invention belongs to the field of gas separation, and in particular relates to a method and a device for removing landfill gas siloxane. Background technique [0002] Landfill gas, also known as landfill gas, is the gas produced during the biodegradation process of garbage after landfill, which is harmful; the main components of landfill gas are methane and carbon dioxide, of which methane is about 45% to 50%, and carbon dioxide is 40%~60%, also contains a small amount of harmful impurities including hydrogen sulfide and siloxane, etc.; the processed landfill gas can be directly supplied to industrial and greenhouse users, among which it is used for heating or industrial production of biogas in this way The thermal efficiency is the highest; after the landfill gas is collected, it is pressurized by the compressor and transported to the internal combustion unit, and then converted into electrical energy and transmitted to the power booster station, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/52C10L3/10B01D53/22B01D53/26
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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