冷凝法回收油气的经济性分析

为分析冷凝法回收挥发油气的经济性,结合中国石化长岭分公司在油气装车时检测的由14种气体组成的油气混合物及其组分浓度数据,对采用三级冷凝工艺回收挥发油气的方案进行建模和计算.3级制冷系统分别采用R22、R404A和R508B作为制冷工质,得到各级制冷系统的制冷系数及其能量消耗结果,采用ChemCAD软件获得油气回收效率,通过计算求得制冷系统年平均运行能耗、运行费用、初期投资和收益.分析结果表明：采用冷凝法对油气进行回收时,该工艺系统投运一年内即可完全收回初期投资和当年运行费用,且当处理油气量为40 kg/h时,当年净盈利可以达到4.487 1×104元,年平均净收益远大于年平均总投资.（表5,图1,参4）

Economic analysis of light hydrocarbons recovering with condensation method

In order to analyze the economic value of condensation method for light hydrocarbons recovering, according to light gas mixture from 14 kinds of gas measured during oil and gas loading in Changling Branch, SINOPEC, and the concentrations of its component, a model of three-stage condensation process for light hydrocarbons recovering was built for simulation. The three-stage compression refrigeration system takes R22, R404A and R508B as refrigerants, the refrigeration coefficient and energy consumption of refrigeration system of each stage were worked out, ChemCAD software was adopted to calculate the recovery efficiency, and the annual mean operation energy consumption, running expenses, initial investment and income of the condensation system were calculated. The results show that when the condensation method is used to recover light hydrocarbons, the initial investment and operation cost will be totally paid back within one year after this system is put into operation. Moreover, when the recovered light hydrocarbon＇s volume dealt is 40 kg/h, the net income in the same year of investment will be 44 871 RMB yuan, that means the annual mean net income is much more than annual mean total investment. （5 Tables, 1 Figure, 4 References）