... Biofuels can replace wood, coal, liquefied natural gas, are widely used for life heating furnace ... can be used as fuel with high energy.What is straw charcoal?A green fuel with high energy, ... which raw material is straw, stalk, bark, industry waste, ect, crushed ... straw charcoal)can replace firewood, raw coal, liquefied gas, widely used in family stove, warming stove, hot ...