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Composition of coal gas:CO: 23-27% H2: 12-17% CH4: 2-3.5%CO2: <5%N2: 50-54%
Types of Gasifier:According to the different requirement on clean degree of smoke, there are two technics, Crude Coal Gas Technics and Clean Coal Gas Technics.
Single stage hot gas stationSingle stage cold gas stationDouble stage hot gas stationDoulbe stage cold gas station
Crude Coal Gas Technics of Single Stage hot gas station:
Single stage gasifier generater coal gas with the temperature from 450-550 °C, after that it goes into the gravity dust collector to remove dust and tar, after that coal gas go throught the cyclone dust collector for secondary cleaning, then coal gas was transported to use.
Clean Coal Gas Technics Characteristic of double Stage cold gas station:
Two stage gasifier gas is divided into the upper gas and the lower gas. Upper gas temperature is 90-150°C, after the removal of heavy tar and dust by electric tar catcher, it goes into the indirect cooler and it is cooled to 35-45°C for electric light oil catcher. Lower gas temperature is about 450-550°C, it goes into the cyclone dust collector first, after that it enters the waste heat exchanger, to cool the gas and recover the heat from it, gas temperature is reduced to 200-230°C before entering the wind cooling system, the temperature is dropped to 65-80°C after the wind cooling process. Through indirect cooler, lower gas is cooled to 35-45°C by circulating cooling water. After all the process, upper gas and lower gas go to the electric light oil catcher II for secondary oil and dust removal. The purified gas is then pressurized and transport to user through pipes.
Clean Coal Gas Technics of double Stage cold gas station:
Two stage gasifier gas is divided into the upper gas and the lower gas. Upper gas temperature is 90-150°C, after the removal of heavy tar and dust by electric tar catcher, it goes into the indirect cooler and it is cooled to 35-45 °C for electric light oil catcher. Lower gas temperature is about 450-550 °C, it goes into the cyclone dust collector first, after that it enters the waste heat exchanger, to cool the gas and recover the heat from it, gas temperature is reduced to 200-230°C before entering the wind cooling system, the temperature is dropped to 65-80°C after the wind cooling process. Through indirect cooler, lower gas is cooled to 35-45 °C by circulating cooling water. After all the process, upper gas and lower gas go to the electric light oil catcher II for secondary oil and dust removal. The purified gas is then pressurized and transport to user through pipes.
Doulbe stage cold gas station