Biofuels can replace wood, coal, liquefied natural gas, are widely used for life heating furnace ... it 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 & ... 1/30 of the raw stalk2. High density, it is 10-15 times to raw stalk in weight, density: ...