A cool storage type biomass gas siloxane removal device

Abstract

The invention discloses a cold accumulation type device for removing siloxane in biomass gas. The device comprises a refrigeration circulating unit, a secondary refrigerant circulating unit and a biomass gas siloxane removing unit; a cold accumulation tank is arranged for cold accumulation of a secondary refrigerant; three heat exchangers for removing siloxane work alternately to pre-cool the coming biomass gas of which the siloxane is removed. The device disclosed by the invention is adaptive to different work conditions and is suitable for removing siloxane type gases in the biomass gas during actual operation so as to guarantee high-efficiency application of the 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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