Process Optimization Of Heavy Hydrocarbon Removal System Of Natural Gas Treatment Plant

Natural gas as a clean energy, although the development of China started late, but the momentum of the development of fierce strength,with the increase of natural gas demand of society, need more development and application of advanced gas treatment process. Regardless of the associated gas of oil field exploitation and non associated gas involves only "light off dehydration and dealkylation, or the production of liquefied natural gas(LNG) to a depth of purification, should according to the processing accuracy and the processing unit scale, combined with various dehydration removal characteristics of hydrocarbon method and actual economic and technical comparison, choose the most suitable technique.C5+ working experience in heavy hydrocarbon component while in natural gas accounted for a small proportion, but in natural gas liquefaction process if the extrusion is not complete, in cryogenic liquefaction section block for heat exchanger channel and the cold box cold blocking, reduces the liquefaction rate, energy consumption increased freezing and plugging serious will lead to parking device. Based on one day processing capacity of 2 million of liquefied natural gas project, the depth off heavy hydrocarbon technology for a series of basic research and provide the theoretical foundation and technical support for the LNG plant in natural gas deep purification.Natural gas liquefaction plants and heavy hydrocarbon commonly used adsorption, cryogenic separation and solvent washing method. This paper compares the adsorption of heavy hydrocarbon removal principle and different sorbents for heavy hydrocarbon desorption performance, and analysis of pre dehydrocarbon dehydration process of hydrocarbon loss A plant; analysis of process in cold box freezing, and cold box freezing and freezing when the heat exchanger performance, and the project used with double circulation mixed refrigerant liquefaction process by HYSYS software simulation, mathematical model of mixed refrigerant cycle in compressor, plate fin heat exchanger, throttle valve and other equipment, the simulation results calculated from the raw data under the limited amount of liquefied products;, to contract a beam according to the energy consumption of refrigerant to optimize the minimum refrigerant ratio and heavy hydrocarbon removal "point" temperature; system according to the minimum energy consumption and liquefaction products yield the largest two models, given the constraint conditions, the variable parameter optimization of process. Through the optimization of pre cooling temperature and variable parameters, in order to make in equal load and natural gas treatment volume flow performance is the best, which can more effectively and prolapse of the cold box pre cooling section is separated from the heavy hydrocarbon, reduce the cold box freezing plugging the possibilities. Finally, this study proposes several improved heavy hydrocarbon removal scheme. According to the factory a reality, according to the reliability and rationality of the selection principle, carries on the comparison from the economy, use of, to elect a more reasonable solution, for a factory to increase off heavy hydrocarbon technology to provide theoretical guidance.