gas generatorUnder ideal gasification conditions, all carbon is converted into co, b. The heat released by the reaction of c and oxygen to generate CO is all used for the water vapor decomposition reaction, and the gasification system is adiabatic. All the chemical heat of carbon will be transferred into the coal gas without loss, making the cold gas gasification efficiency reach 100070. Calculation results of the ideal gasification index. The gasification raw material in the actual gasifier is not pure carbon. There are various side reactions and various heat losses in gasification. There is a big gap between the actual gasification index and the ideal gasification index.
Ways to improve the calorific value of existing gas generator gas. The calorific value of gas generator gas is low, and the main combustible components are CO and H, which mainly come from the C0} reduction reaction and water vapor decomposition reaction. Through measures such as grading and screening lump coal, stabilizing the empty layer and controlling the appropriate furnace temperature and saturation temperature, the purpose of increasing the gas yield, reducing the carbon content of the slag and increasing the calorific value of the gas has been achieved. N is brought in by the input air, accounting for approximately 50070 0 1V of the volume fraction in the gas. It is an inert component. If the N content in the gas can be reduced, the calorific value of the gas generator gas can be increased.
After calculation, every reduction of N= by one percentage point can increase the calorific value of gas by 40-50 k,J/m3. In the ideal gasification index, the volume fraction of N= in coal gas is only 37.6070, which means there is great potential to reduce the N content. Gasification under rich oxygen concentration can increase the calorific value of gas, but the cost of air separation oxygen production is too high.“1. The waste heat of the gas from the furnace is used to preheat the gasification agent with a heat pipe, which increases the gas output and calorific value and improves the reaction process in the gas generator.
By greatly increasing the blast temperature of the gasification agent, the steam in the gasification agent is in a superheated state. This not only brings in a large amount of physical heat, but also makes the steam in a superheated state. It not only accelerates the gasification reaction speed, but also reduces the chemical heat generated by the oxidative combustion of the supplied coal. This not only saves carbon in the gas furnace, but also reduces the supply of air, thereby reducing the introduction of N and increasing the calorific value of the gas. The prerequisites for this gasification process are that there is no slagging or less slagging during the gasification process, and there must be an economical and reasonable heat source. In addition to the waste heat of the gas produced by itself, the waste heat of the industrial kiln can also be used. Use the waste heat of modern carbon black furnaces to preheat the air to 700°C, mix it with the saturated steam of ordinary boilers, and blow it into the gas generator together, reducing the N content of the gas generator gas. The gas generator gas contains higher CH, C, H and other components, and the calorific value of the gas increases to 7550-7 900 kJ/m3.
