What Is Coal Gasification?

Coal gasification refers to a process in which coal, coke, semi-coke and other solid fuels react with a gasifier under high temperature, normal pressure or pressurized conditions, and are converted into gas products and a small amount of residue. The gasifier is mainly water vapor, air (or oxygen) or a mixture of them. The gasification reaction includes a series of homogeneous and heterogeneous chemical reactions. The obtained gas products have different compositions depending on the nature of the raw coal used, the type of gasifier and the gasification process, and can be divided into air gas, semi-water gas, water gas, and the like. The coal gasification process can be used to produce fuel gas, used as industrial furnace gas and city gas, and also used to make synthetic gas, as raw materials for synthetic ammonia, synthetic methanol and synthetic liquid fuels. It is one of the important processes of coal chemical industry. ^[1]

The types of coal gasification can be summarized into five basic types: self-heating water vapor gasification, external heating water vapor gasification, coal hydrogenation, coal water vaporization and hydrogenation combined with manufacturing alternatives

The entrained gasification technology of the entrained bed is based on the hybrid gasification technology (Hybrid) jointly developed by Wison and Shell. Hybrid is an advanced pulverized coal gasification technology that combines the advantages of the existing Shell SCGP waste pan process, including Pulverized coal pressurized gasification conveying system, multi-burner side spray burner arrangement, membrane water wall, intermittent slag discharge, etc. have been fully proven mature and reliable processes in existing SCGP units, while eliminating existing processes Complex and easy-to-fail synthesis gas cooler (waste pot) and fly ash filter, combined with the synthesis gas quenching process currently widely used in existing gasification technology, which retains the original Shell SCGP waste pot process The coal type has strong adaptability and easy-to-large characteristics. It adopts the advantages, absorbs the advantages of the existing chilling technology, and makes targeted improvements.