Only those who can figure out these relationships are true masters of gas
Thread Content
Fuel coal: total moisture, moisture, ash content, volatile matter, fixed C and S, lower heating value, higher heating value on a dry basis. Raw coal: total moisture, moisture, ash content, volatile matter, fixed C and S, lower heating value, higher heating value on a dry basis. How can these values be adjusted to ensure a high carbon content in the process gas?
I don’t understand what you mean! What does the level of carbon in process gas refer to? These are the basic composition data of coal; once the type of coal is determined, these values remain constant.
I think I understand what the original poster is trying to ask. Fuel coal, also known as thermal coal, is used in boilers; it is characterized by a high fixed carbon content, low volatile matter, low ash content, and a high calorific value. The raw coal is used in the gasifier; considering all the details, it is likely that the method the original poster is referring to is coal slurry gasification. The type of coal used in such gasifiers generally has a lower fixed carbon content (compared to fuel coal), a higher volatile content, greater reactivity, a relatively higher ash content (compared to fuel coal), and a lower calorific value (compared to fuel coal). The coal used for water-coal slurry gasification is generally lignite, while bituminous coal is typically used as the fuel coal. Additionally, the purpose of coal blending is to increase the melting fluidity of ash and slag, thereby expanding the operational range of the gasifier; this is the main goal. Secondly, it aims to reduce the cost of coal types as much as possible while maintaining production levels. Finally, the original poster mentioned increasing the C content in the process gas; this concept does not seem quite correct. For the process gas produced by the gasifier, what we need is the useful gas, that is, gas containing CO and H2, while CO2 is actually waste gas (of course, this is different if there are dry ice or MTO units available).
If you are blending coal, then it’s of course better to make such adjustments. But for plants that have already been built, where the raw materials are not easily controllable, what we need to do is ensure stable, continuous, and optimal operation
This can only be determined by analyzing the data after process mixing, and then based on the operating conditions of the gasifier.