Gas generator converts coal into flammable gas——Production equipment for coal gas (main components are CO, H2, CH4, etc.). The working principle is: after screening the coal that meets the gasification process specifications, the coal is added to the gas furnace by a stoker, and a mixture of self-produced steam and air is blown from the bottom of the furnace as a gasification agent. Coal undergoes physical and chemical reactions in the furnace to generate flammable gases. The upper section gas passes through the cyclone oil separator and electric trap to filter the tar. The lower section gas passes through the cyclone dust collector to remove dust, and is mixed and transported to the user. It is widely used in various furnace shapes within the required temperature range of various thermal furnaces such as steel rolling furnaces, annealing furnaces, forging furnaces, steel tube furnaces, glass furnaces, aluminum melting furnaces, copper furnaces, and ceramic building furnaces.

1. What is mixed generator gas?

Answer: Mixed generator gas is a gas produced by using a mixture of air and water vapor as a vaporizing agent.

2. What are the main components of mixed generator gas?

Answer: Mixed generator gas consists of two parts: flammable gases include carbon monoxide, hydrogen, methane and a small amount of heavy hydrocarbons; non-flammable components include nitrogen, carbon dioxide, etc.

3. What is an atmospheric fixed bed gasifier?

Answer: The gasification of the normal pressure fixed bed gasifier is carried out under two specific conditions. First, the gasification process is carried out under normal pressure, and the working pressure is between 3-8 kilopascals. Because it is close to atmospheric pressure, it is called normal pressure. Second, the material layer is stacked on the grate. During the gasification process, the material layer must maintain a certain height, which is the meaning of a fixed bed. The fixed bed is relatively fixed, and its fixed material layer thickness is maintained by dynamic coal addition and ash removal.

4. What is the principle of generating gas in the generator?

Answer: In the generator furnace, the coal flows from top to bottom, and the vaporizing agent flows from bottom to top. They move countercurrently, causing chemical reactions and heat exchange to produce gas. The main chemical reactions are: (1) The reaction between the carbon in the coal and the oxygen and water vapor in the air of the gasification agent; (2) The reaction between the oxygen, water vapor and various production gases in the gasification agent; (3) Thermal cracking reaction of coal.

5. What are the functions of each level in the furnace? What are the reactions?

Answer: 1) Function of ash layer ① The ash settles from the oxide layer and has a relatively high temperature. When air and water vapor are blown in, heat exchange occurs and the vaporizing agent is preheated; ② Since the slag layer is cooled by the vaporizing agent, it is spread on the grate to protect it; ③ The ash and slag is loosely distributed on the grate, which can play the role of evenly distributed air blast.

2) The function of the oxide layer is to cause a sharp chemical reaction between oxygen and carbon in the air to generate carbon dioxide, and at the same time release a large amount of heat to provide heat for the above reactions in each layer.

Oxide layer reaction formula: C+O2→CO2+heat;

3) The reducing layer acts as the main combustible substance in the gas.

Reduction layer reaction formula: CO2+CO→CO；H2O+C→H2+CO2；H2O+C→H2+CO2；

4) The function of the carbonization layer is to precipitate volatile matter and other carbonization products in the coal, turning the coal into coke;

5) The function of the drying layer is to evaporate the moisture in the coal and prepare dry coal for the lower layer.

6. What is the function of the steam drum?

Answer: The steam drum is also called a steam collector. Its functions are:

1) Reliable water supply to the furnace water jacket;

2) Collect the steam generated by the water jacket of the gas generator to achieve steam-water separation;

3) Output steam for system and fire detection use.

7. What is the function of the steam drum safety valve?

Answer: When the steam pressure exceeds the specified pressure, the safety valve will automatically open, discharge steam to relieve pressure, and sound an alarm at the same time. It will automatically recover when the pressure drops.

8. What are the functions of the bell valve?

Answer: The bell valve is also called the maximum relief valve. Its function is to release the gas when the gas stove is in hot standby, gas outage or emergency power outage.

9. What are the functions of saturation temperature?

Answer: 1) Improve the gas quality. Due to the addition of vaporizing agent, hydrogen is generated and the calorific value of the gas is increased;

2) Reduce the gas outlet temperature;

3) Control the temperature of the oxide layer to prevent slagging in the furnace;

4) Since there is no slagging in the furnace, production continuity is ensured.

10. At what position of the water level gauge should the operating water level of the steam drum be maintained?

Answer: The operating water level of the steam drum should be controlled at one-third to two-thirds of the water level gauge.

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