What are the differences in residual carbon, fixed carbon, and carbon content between the coarse slag and fine slag from a gasification furnace?
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We know that when performing process calculations for gasifiers, the carbon balance is taken into account, with the carbon content in the raw coal, the carbon content in the ash, and the carbon content in the gas being used for these balance calculations. In actual coal gasification plants, residual carbon analysis is conducted on the coarse and fine residues resulting from fluidized bed gasification. As I understand it, the residual carbon in these residues is what is known as fixed carbon, and fixed carbon is something different from the C element content. I find it quite confusing to see many places where the residual carbon in the ash residues is equated with the C element content. So, are the data on residual carbon analysis of slag from these gasification plants useful for calculating the carbon conversion rate of the gasification process? How to use it?
In the factory, these are all rough figures; the residual carbon in the slag is related to the sampling and analysis methods, and even the statistics on the amount of coarse slag are rough figures as well.
Analysis of the differences between coarse slag and fine slag in gasification furnaces: During operation, gasification furnaces produce two main types of slag: coarse slag and fine slag. These two types of slag differ significantly in many aspects. I. Differences in physical properties: The coarse residue consists of larger particles that are usually in the form of irregular lumps or granules; its surface is rough and its texture is relatively hard. In contrast, the particles of fine slag are much smaller, appearing in a powdery or finely granular form, with a relatively soft texture. II. Differences in chemical composition: There are also significant differences in chemical composition between the coarse residue and the fine residue. The coarse residue usually contains a high level of carbon and minerals, which give it value in certain specific applications. The carbon content in the fine slag is relatively low, but other elements such as silicon and aluminum may be more abundant, which also provides possibilities for its use in certain fields. III. Differences in application areas Due to differences in physical properties and chemical composition, coarse slag and fine slag are also used in different application areas. Due to its hard texture and high carbon content, coarse slag is often used as a building material or fuel additive. Fine slag, due to its fine particles and specific chemical composition, has a wide range of applications in fields such as agriculture and environmental protection, for example as a soil conditioner or in wastewater treatment. In summary, the coarse and fine slags produced by the gasification furnace exhibit significant differences in terms of physical properties, chemical composition, and application areas. Understanding these differences helps us make better use of these two types of slag, improve resource utilization efficiency, and also contributes to the continuous development of gasification furnace technology