Method and device for removing siloxane in biomass gas through two-stage mode

Abstract

The invention relates to the field of utilization of renewable energy sources, and in particular to a method and a device for removing siloxan in biomass gas through a two-stage mode. The device comprises a pretreatment system, a first-stage biomass gas purifying system and a second-stage biomass gas purifying system. The method comprises the following steps: sequentially pumping biomass gas containing solid-phase and liquid-phase impurities into a net type filter and a gas-liquid two-phase vertical separator, and removing water, foams and solid granules in the biomass gas; pumping obtained biomass gas into an absorption tank filled with a methyldiethanolamine solution, and removing hydrogen sulfide in the biomass gas; then pressurizing, pumping the biomass gas into an absorption tower, entering first-stage and second-stage biomass gas purifying technologies, and storing methane gas. According to the device and the method, disclosed by the invention, the siloxane in the biomass is removed by adopting the two-stage method, purified methane gas is obtained, and the removal rate of the siloxane can be up to not less than 99 percent; the device and the method have important significance in reducing atmospheric pollution and optimizing an energy structure.

Description

technical field [0001] The invention relates to the field of renewable energy utilization, in particular to a two-stage method and device for removing siloxane in biomass gas. Background technique [0002] As a new type of efficient renewable green energy, biogas has developed resource utilization technologies such as biogas power generation and biogas heating. As a fuel, biogas can reduce the emission of greenhouse gases, tiny particles and nitrogen oxides, and has a broader potential. Development space and multiple economic and environmental benefits. In addition to the main components such as methane and carbon dioxide, the biogas produced by anaerobic digestion of landfill and sewage treatment plant sludge also contains other components, such as hydrogen sulfide and siloxane, etc. The existence of siloxane seriously affects the biogas. Use, hinder the use value of biogas. Among them, siloxane has a very large adverse effect on the application of biogas. [0003] In re...

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Problems solved by technology

[0005] Patent CN201210393660.1 "A device and method for removing siloxane gas in combustible gas" introduces a method and device for removing siloxane gas in combustible gas by silica gel adsorption. This method uses silica gel adsorption, and its efficiency It will be affected by moisture in the gas. In addition, the regeneration temperature of the adsorbent is high, which requires a large amount of regeneration heat, which increases the cost

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