... 1:2 Kinds of fuel: natural gas, oil, cola dust, coke oven gas, coal gas of low heat value, and ... mixed fuel of all kinds of fuel (gas and gas, gas and liquid, gas and solid, liquid and solid, and more ... term maintenance Preheating zone: a part between kiln gas drawing-out device and upper burner girder, ... opens downside of the pipes kiln gas is extracted by the gas extracing girder through the opens to ...