The relationship between coal coking and coal water slurry technology is briefly described.

Coking of coal is also called high temperature dry distillation of coal. A coal conversion process in which coal is used as raw material, heated to about 950℃ under the condition of air isolation, and then dry distilled at high temperature to produce coke, and at the same time, coal gas and coal tar are obtained, and other chemical products are recovered. In order to ensure the quality of coke, the most basic requirements for selecting coking coal are volatile, caking and coking; Most coking coals must be washed to ensure the lowest possible ash, sulfur and phosphorus content. When selecting coking coal, we must also pay attention to the expansion pressure of coal during coking. Coking with low volatile coal, because of its high colloid viscosity, is easy to produce high expansion pressure, which causes damage to coke oven masonry and needs to be solved by blending coal for coking.

Coal water slurry (CWS) is a kind of coal-based liquid fuel that appeared in 1970s. It can be used as kiln fuel or synthetic gas raw material, and has the advantages of stable combustion and less pollution discharge.

Coal water slurry gasification involves complex chemical and physical processes such as high temperature, high pressure, heterogeneous phase, flow, transfer and chemical reaction, so it is difficult to study the process under industrial conditions in the laboratory. In this regard, East China University of Science and Technology, under the guidance of related theories of chemical engineering and technology, combined with years of research and development accumulated methods and experience, put forward a hierarchical mechanism model to correctly grasp the relationship between various influencing factors on the basis of profound and comprehensive analysis of gasification process. The complex gasification process is decomposed reasonably, the proposition transformation of research topic is realized, and a set of scientific research and development methods suitable for studying entrained flow gasification process is created. That is to say, the laws of fluid flow, atomization and mixing are studied on the cold mold device; Based on engineering experience, a one-step transformation method of comprehensive iteration on computer is proposed.

The internationally advanced three-dimensional laser Doppler particle dynamic analyzer (DualPDA) and Mafiven particle analyzer were used to study the velocity distribution, concentration distribution, residence time distribution, atomized particle size and its distribution of the fluid in the entrained-flow bed on a large-scale cold model device, and the mathematical models of the three-zone model of flow and reaction, velocity distribution, concentration distribution, residence time distribution, atomized particle size and its distribution were established respectively, thus forming the systematic theory and patented technology of entrained-flow coal water slurry gasification.

The distribution of coal resources in China is concentrated in the "Three Wests", namely Shanxi, Shaanxi and western Inner Mongolia. At present, 63% of coal has to be transferred from the "Three Wests", and there has been a long-term pattern of transporting coal from the north to the south and coal from the west to the east in China. Coal pipeline transportation has the advantages of less investment, short construction period, low operating cost, fully enclosed transportation and no environmental pollution. Coal water slurry can be burned by users when it is transported to the terminal through pipelines, and can be stored in a closed way for a long time.