Simulation Study Of Crushed Pressure Coal Gasification

Lurgi process is thought to be one of the most widespread gasification tecnology.As a mature technology,it has many advantages,such as investment saving,high CH₄concentration in the crude gas and so un.In order to further improve the gasification efficiency,reduce emission CO₂,phenolic wastewater,According to the advantages of gasification agent containing CO₂ in the coal gasification process,resrch the effect of gasification agent on pressurized gasification,and optimized the coal gasification process.In recent years,therefore,the research on different gasifying agents has much significance.In this thesis,Aspen Plus is used to simulate the coal pressurized gastificion process.According to the coal composition and equilibrium balance,the calculation of Poyrolysis gas yield and Char composition is given based on the kinetic model,simulated the pressurized gastification process.The simulation results are in good agreements with the experimental date.Based on the validated model,The Effect of crude gas concentration studied on different O₂/Coal,Steam/Coal and gasification pressure.It shows that increased CO and H₂+CO concentration in the crude gas,and increase steam decomposition rate with O₂/Coal,and approroate steam concentration will be beneficial for process.Given the role of CO₂ in coal gostification process,in this thesis used CO₂+O₂+Steam gasification agents simulated gasification process.Its not significant CH₄ and CO in crude gas with the increase of CO₂ concentration in gasifying agent.Introducing the high O₂/Coal is beneficial for improving the gasifier temperature to increase the co concentration in the gas.The simulated results of 3#coal shows,When the gaotification pressure is 4MPa,the O₂/Coal is 0.2557,the mass flow rate of coal is 73.2t/h,the volume flow rate of CO₂ is 2600Nm³/h,the replacement ratio is 3.15 kg Steam/Nm³ CO₂,CO increased by 2.60%and steam concentration saved by2.275kg/s.which reduced CO₂ emission and waste water treatment system...