A device for removing siloxane from biomass gas

Abstract

The invention discloses a device for removing siloxane in biomass gas, which includes a refrigeration cycle unit, a refrigerant cycle unit and a biomass gas siloxane removal unit; a cold storage tank is provided for cold storage of the refrigerant, and two The heat exchanger for removing siloxane works alternately, and the incoming biomass gas is precooled by the refrigerant after heat exchange with the biomass gas and the biomass gas after removing siloxane. The invention can adapt to different working conditions, and is suitable for removing siloxane gases in biomass gas in actual operation, so as to ensure efficient application of biomass gas.

Description

technical field [0001] The invention belongs to the field of separation and removal of biomass gas components, and relates to a device for removing impurities in combustible biomass gas, which is used for removing impurities such as siloxane and moisture in combustible biomass gas. Background technique [0002] Biomass gas such as landfill gas, biogas, and petroleum-associated gas is mainly composed of methane and is a renewable energy source. Methane is a greenhouse gas, and its greenhouse effect is about 21 times that of carbon dioxide. At the same time, pure methane has a high calorific value, which is 35.87MJ / m 3 ; Biomass gas can be directly used for gas turbines and internal combustion engines to generate electricity after simple purification. [0003] Biomass gas contains a trace substance - siloxane, which will affect the dynamic balance of the gas turbine during combustion, and will form a silicon dioxide layer on the inner surface of the internal combustion engine...

AI Technical Summary

Problems solved by technology

[0005] 1. Biomass gases such as biogas and landfill gas from different regions have large differences in composition, temperature, and pressure. Directly freezing the gas without using cold storage for buffering has poor adaptability and is not conducive to heat transfer. The damage to the device is also greater;

[0006] 2. Below 0°C, the water vapor will condense into frost in the heat exchanger, causing the heat transfer rate to drop or even block the heat exchange tube, and it is necessary to stop the machine for defrosting and interrupt the work

[0010] 3. When the defrosting is switched, it will cause a great pressure shock and thermal shock to the refrigeration system; the way of supercooling defrosting will also cause the suction to carry liquid, and the system stability and safety will decrease; and the biomass gas will return to temperature Very high, and then cooling to the set temperature requires a stable process, which cannot achieve true continuous processing

[0011] 4. The heat transfer process of the refrigerant is a phase change process. When the refrigerant exchanges heat directly with the biomass gas, when the cooling load fluctuates greatly due to changes in the temperature, pressure, and flow of the biomass gas, it is easy to cause absorption. Gas entrainment affects system stability and safety; or causes compressor suction superheat to be too high, discharge temperature too high, and compressor input power to increase

[0012] 5. Once one of the two siloxane removal heat exchangers fails, the system will not be able to truly enter the continuous working state

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