天然气深冷装置工艺模拟与优化
发布时间：2019-04-04 12:46
【摘要】：随着石油化工对C2+轻烃需求的日益增长,回收分离C2+轻烃为主的深冷分离装置的优化操作备受关注。通过深冷装置的模拟计算,分析装置的存在的问题,找出操作参数对产品收率的影响规律,对降低深冷装置运行成本、提高轻烃收率具有重要指导意义。本文采用HYSYS模拟软件对天然气深冷装置进行模拟与优化,在对装置进行物料衡算的基础上,对脱甲塔、动设备、换热器等设备的生产运行状况进行核算,分析了现有装置存在的主要问题,提出了相应的改造建议。结果表明:(1)在处理量为24145.85Nm3/h(设计处理量为25000Nm3/h)时,装置各操作参数平稳,轻烃回收率为28.1%,比设计值33.3%低,而干气回收率为62.6%,比设计值60.5%高。乙烷收率和轻烃中C1/C2摩尔比符合设计要求。(2)塔底抽出取热量提高,塔底温度升高,且塔底抽出取热量与塔底温度之间呈线性关系;(3)随着塔顶温度的降低,万方气轻烃收率升高;塔顶温度由-70℃降低-2℃时,轻烃产量由6802.35kg/h提高到6965.37kg/h,万方气轻烃收率由2.82t升高到2.88t,按日处理量58×104m3计,每天可以多产轻烃3.48t,其效益可观。(4)轻烃产率随制冷深度变化较大,其变化规律基本呈线性关系;制冷温度每降低10℃,轻烃产量提高0.4108t轻烃/104m3原料气;如果按60×104Nm3/天计,每天可多产轻烃24.65t,每年可多产轻烃8997.3t。(5)脱甲烷塔塔顶、塔底温度是相互影响的,在不同塔顶温度下,最佳的塔底温度会变化,为了将这两个因数控制好,达到最佳操作状态,通过模拟计算和分析发现塔顶和塔底温差在103℃左右,这样可以保证塔底轻烃中C1/C2摩尔比不大于0.03。
[Abstract]:With the increasing demand for C2 light hydrocarbons in petrochemical industry, the optimization operation of the cryogenic separation unit for the recovery and separation of C2 light hydrocarbons has been paid more and more attention. Through the simulation calculation of the cryogenic unit, the existing problems of the unit are analyzed, and the influence of the operating parameters on the product yield is found out, which is of great guiding significance for reducing the operating cost of the cryogenic unit and increasing the yield of light hydrocarbons. In this paper, the HYSYS simulation software is used to simulate and optimize the deep cooling unit of natural gas. On the basis of the material balance calculation of the unit, the production and operation status of the decarbonizing tower, the moving equipment and the heat exchanger are calculated. This paper analyzes the main problems existing in the existing equipment and puts forward the corresponding suggestions for improvement. The results show that: (1) when the processing capacity is 24145.85Nm3/h (the design capacity is 25000Nm3/h), the operation parameters of the unit are stable, the recovery rate of light hydrocarbon is 28.1%, which is lower than the designed value of 33.3%, while the recovery rate of dry gas is 62.6%. It is higher than the designed value of 60.5%. The yield of ethane and the molar ratio of C1/C2 to light hydrocarbon meet the design requirements. (2) the heat extracted from the bottom of the tower increases and the temperature of the bottom of the tower increases, and the relationship between the heat extracted from the bottom of the tower and the temperature of the bottom of the tower is linear. (3) with the decrease of tower top temperature, the light hydrocarbon yield of Wanfang gas increases; When the top temperature of the tower is reduced from-70 鈩，
本文编号：2453826
[Abstract]:With the increasing demand for C2 light hydrocarbons in petrochemical industry, the optimization operation of the cryogenic separation unit for the recovery and separation of C2 light hydrocarbons has been paid more and more attention. Through the simulation calculation of the cryogenic unit, the existing problems of the unit are analyzed, and the influence of the operating parameters on the product yield is found out, which is of great guiding significance for reducing the operating cost of the cryogenic unit and increasing the yield of light hydrocarbons. In this paper, the HYSYS simulation software is used to simulate and optimize the deep cooling unit of natural gas. On the basis of the material balance calculation of the unit, the production and operation status of the decarbonizing tower, the moving equipment and the heat exchanger are calculated. This paper analyzes the main problems existing in the existing equipment and puts forward the corresponding suggestions for improvement. The results show that: (1) when the processing capacity is 24145.85Nm3/h (the design capacity is 25000Nm3/h), the operation parameters of the unit are stable, the recovery rate of light hydrocarbon is 28.1%, which is lower than the designed value of 33.3%, while the recovery rate of dry gas is 62.6%. It is higher than the designed value of 60.5%. The yield of ethane and the molar ratio of C1/C2 to light hydrocarbon meet the design requirements. (2) the heat extracted from the bottom of the tower increases and the temperature of the bottom of the tower increases, and the relationship between the heat extracted from the bottom of the tower and the temperature of the bottom of the tower is linear. (3) with the decrease of tower top temperature, the light hydrocarbon yield of Wanfang gas increases; When the top temperature of the tower is reduced from-70 鈩，
本文编号：2453826
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