According to the composition characteristics of coarse syngas from pulverized coal gasification, the selection basis of shift process technol. is introduced.The advantages and disadvantages of high water gas ratio and low water gas ratio are compared and analyzed.The low water gas ratio shift process technol. is determined based on the investigation of energy consumption and investment.The Aspen Plus software is used to simulate and optimize the whole process of byproduct low-pressure steam, utilization of low-level heat energy and treatment of low-temperature process condensate in low water gas ratio shift process of supporting 1.8 million t/a coal to methanol plant, so as to provide reference for subsequent engineering design.

Huaxue Gongcheng (Xi'an, China)

Comparison and calculation of CO shift technology for coal to methanol plant

Author: Wang Gen-bao

Based on the composition characteristics of crude syngas from coal gasification unit, process and tech. characteristics of adiabatic and isothermal CO shift were introduced by analyzing the principles and reaction factors.Taking a coal-to-methanol project with the annual output of 180x10∼4 t as an example, two CO shift process schemes were compared and analyzed from the aspects of process layout, major equipment, tech. economy and capital investment.The results show that the CO isothermal shift process has the advantages of more stable operation, shorter process, higher heat recovery efficiency, and less investment, which are in line with the actual needs of the project.By means of Aspen Plus software, a process calculation model of CO isothermal shift was established and good results were obtained, which could be used as reference for engineering design.

Linfei Yu Fufei

Simulation analysis of solvent extraction method to purify WPA

Author: Yuan Shengjuan

Aspen Plus software is used to simulate the extraction, washing, and back extraction process in the purification of WPA process package by solvent extraction method.Study the effect of extraction temperature and extraction ratio on the extraction rate of P2 O5, and determine the volume ratio of washing acid, desalted water and organic phase resp.The simulation results are analyzed and discussed.The results show that the simulation results are reliable and can provide theor. guidance and tech. reference for engineering design and actual production

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