METHOD OF COAL GASIFICATION Russian patent published in 2014 - IPC C10J1/207 

FIELD: power engineering.

SUBSTANCE: coal is ground and mixed with red clay and limestone. Then wetted with liquid fuel, and upper and lower layers of coal are burnt to produce carbon residue. The upper layer is burnt by burning the layer and supply of air by blowing with specific flow rate of 75-150 m³/m²hour. The produced zone of gasification is moved downwards. The lower layer is burnt by supply of air by blowing containing 1-3 wt % of ozone, with specific flow rate of air equal to 75-150 m³/m²hour. The produced zone of gasification is moved bottom-up. Catalytic coal gasification takes place at the temperature of the gasification zone equal to 600-800°C and is implemented into two stages. The first stage includes supply of air by blowing containing 1-3 wt % of ozone, with specific flow rate of 700-900 m³/m²hour and reheated water steam with temperature of 250-450°C with specific flow rate of up to 150 kg/m²hour. As temperature of the layer increases above 800°C, supply of compressed air is stopped. The second stage includes supply of air by blowing containing 1-3 wt % of ozone, with specific flow rate of 1600-1800 m³/m²hour and reheated steam with temperature of 250-450°C, with specific flow rate of up to 450 kg/m²hour. As temperature of the gasification zone drops below 600°C, supply of steam is stopped.

EFFECT: invention will make it possible to produce combustible gas of higher calorie content, not containing condensed products of pyrolysis, without sintering and liquefaction of a gasification zone.

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