Simulation And Analysis Of Methanol Production Process From Coal

The development of coal-based alternatives to oil is an inevitable trend on the condition of China's natural resource is relatively rich coal and less oil. At present, China's coal production of olefins, ethylene glycol, synthetic oil, syngas, direct liquefaction of coal and other projects have been completed and put into operation, In the process of coal to olefins, the investment and energy consumption of the part of the coal to methanol is the highest, it has also become a hot topic of current researches. Methanol is not only an important chemical raw material, but also can be used as an alternative to oil, more and more researchers pay attention to it, especially in the field of science and chemical engineering. Therefor it is of great practical significance to study the process conditions of methanol synthesis and distillation system, the energy consumption can be reduced and the quality of methanol can be improved.In this paper, Aspen Plus is used to simulate the process of methanol synthesis and distillation system, the results are consistent with the data of actual methanol synthesis and distillation production. By changing working conditions, the influence on methanol production is analyzed, and obtained the optimized operation data. The main contents and conclusions of this paper are as follows:(1) Aspen Plus was used to simulate the methanol synthesis system, and the model was established to reflect the actual production situation. At the same time, using Aspen Plus sensitivity analysis, design specification and other functions analysis of feed temperature, pressure of the synthesis tower, split ratio, hydrogen / carbon ratio, feed flow rate on synthetic tower and the influence of the crude methanol yield and quality. The operation results are feed temperature at 126 ?, hydrogen and carbon ratio than 2.06, feed mass flow 146920kg/h; synthetic tower(R13002) pressure 8.01 MPa, synthetic tower(R13001) pressure 8.41 MPa, tower(R13002) responsible for 59% condition, 41% in charge of tower(R13001) conditions.(2) Aspen Plus was used to simulate the methanol distillation system. According to the three tower temperature distribution and component mole fraction of the changes, the sensitivity analysis and other functions are used to analysis the distillation unit feed temperature, the main distillation column pressure, the reboil ratio, recovery rate and reflux ratio of distillation system. The operation results is the main column pressure 8.1MPa, feed temperature 81 ?, boiling is 2.14, produced 52300 kg/h; recovery tower reflux than 0.706.In this paper, the results of simulation methanol synthesis and distillation system are reliable and analysis is reasonable by unit operation modules and physical property method selected, accordingly the proposed optimization scheme for the plant actually practical has a certain guiding significance.