Simulation and Optimization of Decarbonization Process in the Natural Gas Liquefaction Process
To eliminate the problem of low-temperature freezing and blockage in natural gas liquefaction processes,it is necessary to deeply remove saturated water and CO2 from the raw natural gas.Based on HYSYS software,this study investigates the effects of absorbent temperature and operating pressure on decarburization depth in the natural gas alcohol amine decarbonization process,the relationship between the theoretical number of MDEA absorption towers and the amount of absorbent used,and the influence of the theoretical number of MDEA regeneration towers on the heat load of the reboiler.Through theoretical analysis and process simulation,the optimal operating parameters for the decarbonization system are:absorbent temperature of 52℃,absorbent dosage of 7 584 kmol/h,MDEA absorption tower operating pressure of 4.45 MPa,theoretical tray number of 25,and MDEA regeneration tower theoretical tray number of 26,in order to meet the liquefaction index requirements of the LNG plant with a decarbonization purification gas CO2 content of≤50×10-6 under the operating conditions of a decarbonization device design scale of 600×104 m3/d and a raw material natural gas CO2 molar fraction of 2.20%.
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