SU72570A1 - Method and gas generator for gasification of finely divided and pulverized fuel - Google Patents

Description

Known methods of gasification of finely divided and pulverized fuel in the generator, inside which are arranged chambers of heat-conducting material.

A feature of the described gasification method is that part of the air-fuel mixture is burned completely or partially inside the chambers due to the supply of secondary blowing into the chambers in order to supply additional heat to the gasified material.

The resulting flue or generator gas is released separately from the gas of the main gasification process.

The drawing shows a vertical section of the gas generator.

The proposed gas generator operates according to the method of gasification of dust in the ascending gas stream. The prepared dusty air mixture is introduced into the gasification chamber from the bottom through a row of tuyeres.

The ignition and partial combustion of dust with the complete expenditure of oxygen in the air occurs in the diffusers 2 and in the space above them. The upstream part of the gasification chamber, in which endothermic reactions should take place, is divided by refractory and sufficiently heat-conducting partitions 3 into a series of narrow chambers 4, 5. Chambers 4 communicate with the upper part of the gasification space, and chambers 5 are closed and have gas-discharging in the upper part windows 6 communicating with the outer channel 7 serving to remove flue gases. Hot air is blown into the chambers 5 from the bottom through the nozzles, and superheated steam can be blown into the chambers 4. The process of gasification of pulp shale proceeds as follows: through the tuyeres / a dust-air mixture is blown into the gasification chamber, in which air is contained in an amount of not more than 25% of that required for complete combustion of the shale. There is no oxygen in the 2 n diffusers above them, as the gasification chamber does not have time to react with combustible components.

No. 72570-2 fuel. The temperature of the dust-gas flow rises, thermal decomposition processes take place in the fuel particles, and gasification products are formed along with the complete combustion products. Due to the lack of heat, endothermic processes do not proceed to the end and a significant amount of non-carbonized carbon remains in the mineral part. Next, the dust-gas stream, making an upward movement, enters the chambers 4, 5, into which the secondary blast is supplied, due to which the burning of the combustible components of the hot dust-gas mixture prepared in the prechamber occurs. Heat released in chambers 5 is transferred through heat-conducting walls to chambers 4, where this heat increases the temperature of the dust-gas flow rising to the upper zone of the generator. By supplying additional heat to chambers 4, the process of carbonate decomposition of the mineral part of the fuel will be intensified, and the carbon dioxide released will burn carbon from the fuel particles, reducing to carbon monoxide. The endothermic processes occurring in the chambers 4 are completed in the upper zone of the gasification chamber.

 Present Invention

Claims (2)

1. The method of gasification of finely divided and pulverized fuel in the generator, inside which chambers of heat-conducting material are arranged, characterized in that, in order to supply additional heat to the gasified material, part of the fuel-air mixture is burned completely or partially inside the chambers due to the supply of secondary blowing, and the resulting flue or generator gas is released separately from the gas of the main gasification process. 2. A gas generator for implementing the method according to claim 1, characterized in that the chambers of heat-conducting material are connected through a window to a gas-conducting channel.