Research On Carbon Monoxide Shift Process Technology

With the increasing demand for energy,coal chemical industry plays an important role in energy sustainable development strategy of China.This is also an important development direction of energy in the last few decades in China.Presently,nearly 30 coal to olefins projects amount to the total capacity of olefins about 20000000 tons are being built or planned in China.The coal to olefin factory is composed of three parts,which are coal-to-methanol,methanol-to-olefin and utilities.The most attention is coal-to-methanol because of its large investment and high energy consumption.In this paper,the matching of CO shift reaction process with different coal gasification processes are studied.The reaction mechanism of CO shift reaction are also discussed.The ASPEN software is used to simulate the process of CO shift reaction,and the problems of energy utilization are researched.Some advice is given about energy recovery in the CO shift reaction process.The specific research contents are as follows:(1)Based on the comparison of several mature gasification processes and their matching carbon monoxide conversion processes,combined with the characteristics of high sulfur content of coal in China,it is suggested that Co-Mo series sulfur resistant conversion catalyst be used in the carbon monoxide conversion process of large-scale coal chemical plant,and the conversion process is set in double series,each series adopts partial gas volume and deep conversion in the process plan,the adiabatic transformation and heat recovery are respectively set.(2)The effects of reaction heat,reaction equilibrium constant,reaction mechanism and other process conditions on carbon monoxide shift reaction were studied,providing theoretical basis for process optimization and process simulation.(3)Use Aspen simulation software to simulate the carbon monoxide transformation process.On the basis of the establishment of the process,specify the relevant logistics data and unit module data to ensure that the data required by the simulation system is input completely before the simulation calculation.The process simulation is based on the PDP process package data of the carbon monoxide conversion device.The results of Aspen simulation calculation show that the gas composition of each stream is basically consistent with the design value,ensuring the accuracy and feasibility of the process simulation,providing the basis for the comparison and calculation of the optimization scheme of the carbon monoxide conversion unit.On this basis,the optimization scheme of increasing 4.1MPa steam production is discussed by setting optimization variables.(4)This paper puts forward the method of recovering carbon monoxide to transform low temperature waste heat,so as to achieve the purpose of heat recovery,save desalted water consumption and reduce the cost of sewage treatment.The approach of the research will provide the experience for selection of CO shift reaction unit,optimization of steam system and equipment selection,which has practical significance for promoting energy saving and emission reduction of coal-to-methanol production projects.