Principle of gas generator

Time:2018-11-20 Author:admin

The principle of the gas generator is to place the lump coal in the gas generator, ignite the bottom coal, cover the 3000-4000mm thick coal seam, and then blast the air and steam with the coal to produce a series of redox reactions. Equipment for obtaining semi-water gas containing combustible components such as CO and H2 at the exit.

   1. The function of the ash layer is to ensure the safety of the slag removal device and its height is 200-300mm (best in normal operation). The same is true for the rotating ash tray, which refers to the top of the hood instead of the bottom, and the ash layer. Another function is to exchange hot and cold gas and air to provide the best desired material for the oxide layer to provide superior conditions for the oxide layer for combustion.

   2, the oxide layer (inner thickness of 500mm) its main purpose is to make the oxygen in the air react with coal to generate carbon dioxide, while releasing a large amount of heat,

That is, C+02=CO2+393.8MJ/kmol

   3. Reductive layer: The reducing layer is the area where gas is generated. Its thickness is 300-400mm. Its role is:


    C+H2O=CO+H2+131.5MJ/ kmol

    C+2H2O=CO2+2H2+41.0MJ/ kmol

   4. The dry distillation layer: the CmHm compound produced by heating the volatile matter, tar and the like in the coal is separated, and then enters the reduction to carry out a chemical reaction, and the height thereof is 200 mm thick.

   5. Dry layer: It is to evaporate the water in the coal.

    Basic knowledge of gas gasification principle

    Oxide layer

    The oxide layer (fire layer) in the gas generator is a key part of the gas generation, and its height is about 4000 mm.

    2. Dry layer

    Drying is actually drying. When the gas is at a certain temperature (500 ° C), the moisture on the surface of the coal is quickly changed to steam and mixed in the gas outside the furnace. It is required that the coal entering the gas generator should not carry water. Otherwise it will affect the quality of the gas.

    4. Dry distillation layer

    After the coal block is dried, it is further heated (400 ° C - 500 ° C). The coal block shows a dry cracking state. This state is called drying. In this process, a part of the gas such as alkane, hydrogen, carbon monoxide, tar is decomposed, and the gas is mixed out of the furnace. The actual coking gas is the mixed gas produced in this state. The main components in the gas are hydrocarbon (methane) tar and a small amount of carbon monoxide. Therefore, the coking gas has a high calorific value and good quality. The above is the dry distillation process, which refers to the use of bituminous coal blocks. During the retorting process, anthracite blocks produce a small amount of hydrocarbons, almost no tar.


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