Abstract: In order to realize the clean,efficient and low-carbon utilization of coal,combined with partial coal gasification and semi-coke combustion to realize the grading and separating utilization of coal-gas and electricity,the Aspen Plus process simulation software was used to simulate the partial pulverized coal gasification and semi-coke combustion of gas and electric power polygeneration system for 300 MW coal powder boiler. First,under certain assumptions,a coal gasification model based on the principle of reaction equilibrium was established by using Aspen Plus software,and the simulation results were compared with the experimental bench gasification results,and the simulation results were basically consistent with the experimental results. On the basis of this coal gasification model,the influence of oxygen-to-coal ratio and coal type on the gas composition at the outlet of the gasifier and the economic benefit of the 300 MW polygeneration system was explored. The calculation results show that the effective gas production rate of Shenfu Dongsheng coal gasification increases from 58.49% to 82.85% when the oxygen-to-coal ratio increases from 0.1 to 0.3,and the increased annual revenue of the polygeneration system increases from 160.84 million yuan to 622.46 million yuan; when the oxygen-to-coal ratio is 0.3,the effective gas production rates of Shenfu Dongsheng coal,Gongyi anthracite,Shenhua bituminous coal and Ximeng lignite coal gasification are 82.85%,74.51%,77.21%and 95.16%,respectively. The increased annual income of the polygeneration system by using the three coal types as raw materials is463.92 million yuan,289.1 million yuan and 62.46 million yuan,respectively. It is concluded that the gas quality,effective gas production rate,and the economic benefits of the polygeneration system are significantly improved within the simulated range of oxygen-to-coal ratio,as the oxygen-to-coal ratio increases; in the operating condition where the oxygen-to-coal ratio is 0.3,the economic benefits of the system are the best when using Shenfu Dongsheng coal as the raw material,followed by Shenhua bituminous coal and Gongyi anthracite. The semi-coke produced by coal gasification of Ximeng lignite is too low to be conducive to the operation of the polygeneration system.