The techndogical flow: Up-stage gas gets into electrical detarrer, whose work temperature is between 90-150'C. Where the light tar fogdrops and dusts are polarized and then influxed on inside wall of polartube, and finally flows automatically to light oil jar. The content of light tar is equal to heavy diesel oil. Then, gas into the cyclone separation is centrifugally separated and gas temperature is lowered to about 450-550'C. Upstage gas is mixed with down-stage gas for hedting stove through gas pipes.