The two-stage gasifier is composed of a retort section and a gasification section from top to bottom. First, coal enters the furnace body from the coal bunker at the top of the gas generator through two sets of lower coal valves. The coal is fully dried and retorted at low temperature for a long time in the retort section, gradually forming semi-coke and entering the gasification section. The hot semi-coke fully reacts with the gasification agent blown from the bottom of the furnace in the gasification section. It passes through the reduction layer and oxidation layer in the furnace to form ash, which is automatically discharged from the ash basin driven by the grate.

       During the process of low-temperature carbonization of coal, the gas generated mainly by the precipitation of volatile components is called carbonization gas. It forms the top gas of the two-stage gas generator, accounting for about 40% of the total gas volume. It has a high calorific value (6700KJ/nm3), a low temperature (about 120℃), and contains a large amount of tar. This kind of tar is a product of low-temperature carbonization and has good fluidity. It can be collected by electrostatic precipitator and used as chemical raw materials and fuel.

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