What is the principle of a coke oven gas burner
Coke oven gas burner: Solid fuel is converted from gas producers to gas fuel. 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, limit the air at the bottom of the furnace, and prevent the coal from completely burning, resulting in a large amount of carbon monoxide, which is the production gas. This method causes the main gases discharged from the furnace to be 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 cause severe combustion of the coal, then stop the fan, and inject water vapor from the furnace bottom and top in sequence to combine with hot coal. Generate a large amount of hydrogen and carbon monoxide, and then mix with nitrogen in the air and remaining water vapor to form water vapor.
The production method of coke oven gas burner is to pulverize raw coal, mix and load it into coke oven according to the proportion of different coals after coal washing, and heat the air with heat insulation. High temperature will cause coal decomposition to produce gas and coal tar. The gas produced by using coal or coke as raw material, air and steam as gasification agents, and entering the gas furnace. It is the most commonly used gasification gas, produced by the moving bed gasification method. The production factory is called a gas power plant. The gasification process of the generator: The gasification raw materials are placed from the top of the furnace into the furnace. The entire fuel layer is supported by a grate. The gasification agent enters from the bottom of the grate, is evenly distributed in the grate, and comes into contact with the fuel layer, causing a gasification reaction. The generated gas is sucked in from above the fuel layer. The remaining ash is discharged from the bottom of the grate. This gas-solid two-phase countercurrent operating furnace can fully utilize the heat of the ash to preheat the gasification agent, and also fully utilize the sensible heat of the rising gas in the gasification layer to heat the fuel, dry and pyrolysis, thereby improving the thermal efficiency of the furnace; The volatile substances in the fuel do not undergo high-temperature cracking, thereby 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 cooled and purified gas is approximately 5.0-6.5MJ/m, depending on the properties of the raw materials and operating conditions.
Oxygen and water vapor first undergo oxidation reactions 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-162.219 kJ/mol; H2O+C=H2+CO-118.685kJ/mol, thereby increasing H2 and CO in the gas. Due to the release of volatile substances on the reducing layer in the dry distillation layer, the fuel evaporates water vapor in the drying layer, resulting in combustible components such as CO, H2, CH4, C2H4, and non combustible components such as N2, CO2, H2O. Therefore, it can be used as a fuel.
The gas generated by introducing a 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 lining is easily damaged, 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, which produces a high calorific value of water gas (10000~11300kJ/m), but due to the water gas reaction absorbing a large amount of heat, air needs to be introduced regularly, and the gas production process is discontinuous.