四川某天然气轻烃回收工艺技术研究

发布时间：2018-03-27 14:17

本文选题：天然气　切入点：轻烃回收　出处：《西南石油大学》2017年硕士论文

【摘要】：天然气具有低污染、高热值的特点,对天然气进行高效利用已成为许多国家调整能源结构的重要措施。天然气中除含有甲烷外,还包含一定量的C2+低碳烷烃。回收天然气轻烃可改善天然气质量,降低天然气露点,提高经济效益。根据四川某气田的AN区块试采情况,为满足天然气外输烃和水露点要求,提高气田开发综合经济效益,适应社会对天然气、凝析油及液化石油气等产品的需求,将勘探成果转化为油气工业化生产,获取经济效益,需建设油气处理装置进行脱水和轻烃回收,拟建规模为150×104Nm3/d。本研究根据气田实际气质情况,对天然气脱水及轻烃回收工艺进行了比选,确定总体处理方案,并完成了相应工艺计算。本文采用4A分子筛三塔脱水、混合冷剂制冷二次脱烃工艺作为设计方案。天然气经过滤分离、聚结分离后,进入分子筛脱水装置进行脱水。分子筛采用干气连续再生,同时通过压缩机对再生气增压循环。轻烃回收装置采用混合冷剂外制冷分离轻烃,轻烃经脱乙烷塔处理后,再经脱丁烷塔分离生产出合格的液化气和稳定轻烃产品。本研究进行了工艺计算和主要设备计算,并确定了混合冷剂中乙烯、丙烷、正丁烷三种组分的最优配比,最终得出拟建规模下的最优工艺。
[Abstract]:Natural gas has the characteristics of low pollution and high calorific value. The efficient utilization of natural gas has become an important measure to adjust the energy structure in many countries. The recovery of natural gas light hydrocarbon can improve the quality of natural gas, reduce the dew point of natural gas and increase economic benefit. According to the test production situation of an block in a gas field in Sichuan, in order to meet the requirements of natural gas transportation and water dew point, To improve the comprehensive economic benefits of gas field development, to meet the needs of the society for natural gas, condensate oil and liquefied petroleum gas, etc., to convert the exploration results into the industrial production of oil and gas, and to obtain economic benefits. It is necessary to construct an oil and gas treatment unit for dehydration and light hydrocarbon recovery, and the scale to be built is 150 脳 104Nm ~ 3 / d. According to the actual gas field temperament, the natural gas dehydration and light hydrocarbon recovery processes are compared and selected, and the overall treatment scheme is determined. In this paper, the dehydration process of 4A molecular sieve three tower and the secondary desorption process of refrigerant refrigerant are adopted as the design scheme. The natural gas is separated by filtration, coalescence and separation. Enter the molecular sieve dehydration unit for dehydration. The molecular sieve is continuously regenerated by dry gas and pressurized by the compressor. The light hydrocarbon recovery unit uses mixed refrigerant external refrigeration to separate the light hydrocarbon, and the light hydrocarbon is treated by deethane tower. Then the qualified liquefied gas and stable light hydrocarbon products were produced by separation of debutane column. The process calculation and main equipment calculation were carried out in this study, and the optimum proportion of ethylene, propane and n-butane in the mixture was determined. Finally, the optimal process of the proposed scale is obtained.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ221;TE644

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