Impact of volatile components in coal on gasification technology

For Texaco or four-nozzle gasifiers, the high volatile content of coal makes it easy to ignite when feeding.

Volatile matter is the gaseous and steam products emitted by the organic matter in coal when heated to a certain temperature. It is an important symbol that reflects the degree of coal deterioration. The level of volatile matter is an important factor affecting the reaction activity. The higher the volatile matter, the more beneficial it is to the gasification reaction. However, high volatile content has a greater impact on the storage of pulverized coal. Over time, it can easily cause spontaneous combustion and explosion of pulverized coal. The volatile components do not participate in the reaction during the gasification process. They are first evaporated at high temperatures to participate in combustion and provide heat for gasification. ； After the volatile matter overflows, micropores are left in the pulverized coal particles, which makes it easy for the oxygen or water vapor participating in the reaction to enter into full contact with the pulverized coal, which increases the reaction activity. Therefore, the higher the volatile matter, the better for the gasification reaction.

The volatile components directly volatilize and react with the gasification agent in a high temperature environment, and the reaction time is short and complete.

Volatile content is of great significance to coal gasification. It can not only reduce the temperature required for coal gasification (combustion support) during the gasification process, but also improve the slurry quality and increase the fluidity of the slurry in Texaco coal-water slurry gasification. Although the shell is not particularly strict on raw material requirements, too much volatile content will cause trouble in raw material processing.

It is true that the higher the volatile content, the better. If it is higher, it is like biomass. Our factory's trial burning of lignite will cause serious dust pollution, and when the time comes to trial burning biomass, it will be even more dangerous. In addition, when the volatile content is high, the fixed carbon is reduced, the ash content is also very low, and the ash melting point is often also low.

In the fixed bed, due to the high temperature, the volatile components are cracked during the gasification stage, and the heat absorption is not conducive to the decomposition of the steam.

For the entrained bed gasification process, the volatile content is high, the coal has good reactivity and is easy to burn.； But the volatile content is high. As my friend on the sixth floor said, the fixed carbon content is reduced, which affects the effective gas content.

High volatile content, which also has a certain impact on the burner

With high volatile content, the activity of coal must be very good, which is very beneficial to coal gasification, but the carbon dioxide content in the export gas will definitely increase.

It should be methane which is more appropriate. However, coal with high volatile content generally has a low ash melting point, so the operating temperature of the gasification furnace is also low, which can also affect the CO2 content.

High volatile matter indicates a high content of organic matter in coal, which is generally understood to be hydrocarbons. Hydrocarbon organic matter is mainly hydrocarbons. In the gasifier, its preliminary combustion reaction will produce water and carbon dioxide. The conversion heat of carbon and the carbon in coal can be understood to be consistent. So what is increased by high volatile matter is the hydrogen-oxygen complex. To provide the endothermic carbon gasification reaction with the combustion heat of compounds, the total heat in the gasifier should be balanced. If the temperature required in the gasifier is slightly lower due to the fact that the ash melting point of coal with high volatile content is mostly low, the heat required for the combustion reaction will be reduced, so the carbon dioxide in the outlet gas may not increase. Please give me some advice from the Fang family