The advent of coal-water slurry originated from the world oil energy crisis in the 1970s. At that time, after the great economic recession caused by the oil and energy crisis, the world clearly realized that oil and natural gas, as clean energy, were not inexhaustible. Abundant coal was still a long-term and reliable main energy source. However, the historical lessons of severe air pollution caused by traditional coal burning cannot be repeated. Therefore, coal liquefaction, gasification and slurry have become research topics that advanced industrial countries generally attach great importance to. Coal-water slurry is the best result of coal liquefaction and the cheapest practical technology for clean utilization of coal.
Coal water slurry gasification involves complex chemical and physical processes such as high temperature, high pressure, heterogeneous phase, flow, transfer and chemical reaction, making it difficult to conduct process research under industrial conditions in the laboratory. In this regard, East China University of Science and Technology, under the guidance of theories related to chemical engineering and technology, combined with the methods and experience accumulated in many years of research and development, and based on an in-depth and comprehensive analysis of the gasification process, proposed a method to correctly grasp the relationship between various influencing factors. hierarchical mechanism model. The complex gasification process was reasonably decomposed, the proposition transformation of the research topic was realized, and a set of scientific research and development methods suitable for studying the entrained bed gasification process were created. That is to study the fluid flow rules, atomization and mixing rules on the cold mold device; draw on engineering experience and use a comprehensive and iterative one-step transformation method on the computer.
The internationally advanced three-dimensional laser Doppler particle dynamic analyzer (DualPDA) and Mafiven particle tester are used to study the velocity distribution, concentration distribution and residence time distribution of the fluid in the airflow bed on a large cold mold device , atomized particle size and distribution, etc., and established mathematical models such as flow and reaction three-zone model, velocity distribution, concentration distribution, residence time distribution, atomized particle size and distribution, etc., thus forming a systematic airflow bed water Coal slurry gasification theory and patented technology have laid the foundation for technological innovation in this field.
China’s coal resources are concentrated in the “Three Wests”, namely Shanxi, Shaanxi and western Inner Mongolia. At present, 63% of the coal has to be transferred from the "Three West". China has a long-standing pattern of coal transportation from the north to the south and coal from the west to the east. Pipeline transportation of coal has low investment, short construction period, low operating costs, fully enclosed transportation, and does not pollute the environment. The coal-water slurry is transported to the terminal through pipelines and can be burned by users, and can be stored in a sealed container for a long time.