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Main classification of gas generators

Main classification of gas generators
Jul 02, 2021 Category: Technology Category Page Views: 35 Author: EBICO Burner

According to the different gas production process and the quality of the gas produced, the gas generators are divided into single-stage gas generators, double-stage gas generators and dry distillation gas generators.

 

Single Stage Gas Generator

The product of single-stage gas producer burner belongs to a thermal process of solid fuel (coal or coke) passing through gas, that is, oxygen or oxygen compounds (steam, carbon dioxide) are passed through the high temperature layer of solid fuel (coal, coke), where the organic substances (air, water vapor) acting as oxidizing agents are called gasification agents to produce a gas mixture containing hydrogen, carbon monoxide and methane, etc. called gas. The atmospheric pressure fixed-bed gas producer, generally with lump anthracite or bituminous coal and coke as raw materials, uses steam or a mixture of steam and air as the gasification agent to produce gasification gas with carbon monoxide and hydrogen as the main combustible components.

 

gas generator burner

 

Double Stage Gas Generator

The gas generated by the two-stage gasifier is divided into upper gas and lower gas. The upper section of gas is firstly treated with a first stage electric tar trap to remove heavy tar and dust, and its working temperature is between 90-150 degrees Celsius, before entering the indirect cooler, where the gas is cooled to about 35-45 degrees Celsius. The lower section of gas is de-dusted by a cyclone dust collector, and the temperature after de-dusting is about 450-550 degrees Celsius. Then it enters the waste heat exchanger, which recovers the sensible heat of gas while cooling down the gas, and the temperature of gas is reduced to about 200-230 degrees Celsius; then it enters the air cooler, and the temperature is reduced to 35-45 degrees Celsius.

After being indirectly cooled, the top gas and the bottom gas enter the second stage electric light oil trap to remove oil and dust again, and the cooled and purified gas is pressurized and transported through the gas pipeline for use. The top gas of the two-stage furnace, which accounts for about 40% of the total gas volume, has a high calorific value (6700kJ/nm3 ), low temperature (about 120℃) and contains a large amount of tar. This tar is a low-temperature dry distillation product with good fluidity, which can be trapped by electrostatic precipitator and used as chemical raw material and fuel. In the gasification section, the incandescent semi-coke and vaporizing agent undergo a series of chemical reactions such as reduction and oxidation to produce gas, which is called gasification gas.

 

gas generator burner

 

Dry Distillation Type Gas Generator

The dry distillation gas producer is a type of furnace developed on the basis of the two-stage furnace, which eliminates the lower gas section of the two-stage furnace. All the gas is fully dry distilled in the dry distillation section and discharged from the top of the gas furnace. The dry distillation furnace not only retains the advantages of the two-stage furnace in terms of simple control of the charge layer, but also does not need to adjust the flow rate of the gas because all the gas produced in the gasification section goes upward, which greatly reduces the complexity of the operation and maintenance of the gas furnace. The dry distillation furnace outperforms both the single-stage and two-stage furnaces in terms of gas reduction and ash carryover.

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