... , there is no odor and no environment pollution. HCY Heating device are optional, there are oil-burner furnace, natural-gas furnace ... will produce different density diesel fuel oil. 2, HCY Heating device are optional, there are oil-burner furnace, natural-gas furnace ... distillation process, HCY process is a Pyrolysis way. 4, HCY machine is friendly environment, it produces less sludge, the sludge is ...