Residue has higher conversion, tar, gas volume yield and less water yield than parent coal.
残渣与父本煤相比有更高的转化率、焦油收率和热解气体积收率，而热解水收率较低。
2
Gas after gasification comprised the more dust, tar and water, it is must to be purified. Mainly is to.
凝结为液态，分离和处理有一定难度。常用的净化设备有旋风除尘器、喷淋水洗塔、汽水分离器、焦油过滤。
3
It takes up to four barrels of water to generate one barrel of tar-sands crude, and 20% of Canada's natural gas (a clean fuel) is used to produce oil (a dirty one).