What Is The Principle Of Coke Oven Gas Burner
What Is The Principle Of Coke Oven Gas Burner
Coke oven gas burner: solid fuel is converted into gas fuel by the gas producers. There are many ways to produce gas, such as coke oven gas, production gas, water gas, oil gas, blast furnace gas, cracking gas, etc. The production method of producing gas is to burn coal in the furnace, and limit the air at the bottom of the furnace, so that the coal can not be completely burned, thus producing a large amount of carbon monoxide, that is, production gas. In this way, the main gases discharged from the furnace are carbon monoxide, carbon dioxide, and nitrogen.
The production method of water gas is to ignite the coal in the furnace, blow enough air into the furnace bottom to make the coal burn violently, then stop the fan, and successively inject water vapor from the furnace bottom and furnace top to combine with hot coal. A large amount of hydrogen and carbon monoxide are generated and then mixed with nitrogen in the air and the remaining water vapor to form water vapor.
The production method of the coke oven gas burner is to pulverize raw coal, and after coal washing, mix it according to the proportion of different coals and put it into the coke oven. The air is heat insulated and heated. The high temperature makes the coal decompose to produce gas and coal tar. The gas is produced by taking coal or coke as raw material, air, and steam as gasifying agents, and entering the gas furnace. It is the most commonly used gasification gas, which is produced by the moving bed gasification method. The production plant is called a gas power station. Gasification process of generator: gasification raw materials are put into the furnace from the furnace top. The whole fuel layer is supported by a grate. The gasifying agent enters from the bottom of the grate, distributes evenly in the grate, and contacts with the fuel layer, causing a gasification reaction. The resulting gas is drawn in from above the fuel layer. The remaining ash is discharged from the bottom of the grate. The gas-solid two-phase countercurrent operation furnace can make full use of the heat of ash to preheat the gasification agent, and can also make full use of the sensible heat of the gas rising from the gasification layer to heat the fuel, dry, and pyrolysis, thus improving the thermal efficiency of the furnace; The volatile substances in the fuel will not crack at high temperature, thus increasing the calorific value of the gas. The extracted gas contains CO, H2, CO2, N2, CH4, C2H4, H2S, H2O, nitride, and tar vapor. The calorific value of the gas after cooling and purification is about 5.0-6.5MJ/m, depending on the nature of raw materials and operating conditions.
Oxygen and water vapor first oxidize in the lower combustion layer:
C+O2=carbon dioxide+408.372 kJ/mol; 2H2O+C=2H2+CO2-75.150 kJ/mol; Then CO2 and H2O rise and react with hot solid fuel to produce a reduction reaction: CO2+C=2CO-162.219kJ/mol; H2O+C=H2+CO-118.685kJ/mol, thus increasing H2 and CO in the gas. The volatile substances in the retorting layer are released on the reduction layer, and the fuel evaporates water vapor in the drying layer. The final gas composition includes combustible components such as CO, H2, CH4, C2H4, and noncombustible components such as N2, CO2, and H2O, which can be used as fuel.
The gas produced by introducing single air into the production machine is air-generated gas with a low calorific value (3760~4600kJ/m); the temperature of the combustion layer in the furnace is high, the furnace lining is easy to be damaged, and the heat loss is large, and the ash is easy to melt and block the grate. The single steam generator is a water gas generator with a high calorific value (10000~11300kJ/m) of water gas generated, but because the water gas reaction absorbs a lot of heat, it is necessary to introduce air regularly, and the gas production process is discontinuous.