空气LAES与乙烯ECSP耦合的研究  

Study on Coupling of Air LAES and Ethylene ECSP

作　　者：何琨 应付钊 王江义 He Kun;Ying Fuzhao;Wang Jiangyi(Sinopec Shanghai Engineering Co.,Ltd.,Shanghai 200127,China)

机构地区：[1]中石化上海工程有限公司,上海200127

出　　处：《化工设计》2024年第6期36-44,2,共10页Chemical Engineering Design

摘　　要：近年来,高效率、高储能密度的液化空气储能(LAES)技术格外引人关注。乙烯工业生产装置深冷分离工艺(ECSP)涉及物质品种多,物性复杂,两种技术方法不同,两个工艺涉及的行业跨度大,故LAES与ECSP耦合难度较大。绿电技术进展为降低乙烯装置二氧化碳的排放提供了极其有利的技术基础,将现有乙烯工业生产装置裂解炉加热裂解原料所消耗的燃料优化为电能加热,急冷锅炉产生的高压蒸汽通过蒸汽透平驱动乙烯装置三大压缩机组优化为电机驱动。将LAES膨胀发电机组发电的电能用于裂解炉加热裂解原料和电机驱动三大压缩机组,从而减少燃料的消耗,并通过三大压缩机组和ECSP分离出乙烯装置的乙烯产品、丙烯产品。同时,乙烯装置急冷锅炉产生的高压蒸汽驱动LAES空气压缩机,由此发挥出最佳的LAES与ECSP耦合协同效应。保持LAES工艺参数不变,与常规乙烯装置分离工艺相比,采用LAES耦合ECSP可大大降低顺序分离、前脱乙烷、前脱丙烷工艺流程的压缩机总功率,并大大减少乙烯装置的二氧化碳排放量。In recent years,liquefied air energy storage(LAES)with high efficiency and high energy storage density has attracted particular attention.The cryogenic separation process(ECSP)in the ethylene production plant involves a variety of substances with complex physical properties.The two technical methods are different and the industry span involved in the two processes is large.Therefore the coupling difficulty between LAES and ECSP is relatively high.The progress of green power technology provides an extremely favorable technical foundation for reducing carbon dioxide emissions from ethylene plants.Optimize the fuel consumed for heating and cracking raw materials in the cracking furnaces of existing ethylene industrial production plants to electric energy heating.The high-pressure steam generated by the quench boilers,which originally drives the three major compressor sets of the ethylene plant through steam turbines,is optimized to be driven by electric motors.Use the electric energy generated by the LAES expansion generator set to heat and crack raw materials in the cracking furnaces and drive the three major compressor sets by electric motors,thereby reducing fuel consumption and separating ethylene products and propylene products of the ethylene plant through the three major compressor sets and ECSP.Meanwhile,the high-pressure steam generated by the quench boiler of the ethylene plant drives the LAES air compressor,thus bringing out the optimal coupling and synergistic effect between LAES and ECSP.With the process parameters of LAES remaining unchanged,compared with the separation process of conventional ethylene plants,the adoption of the coupling of LAES and ECSP can significantly reduce the total power of compressors in the sequential separation,front-end deethanization and front-end depropanization process flows and can also greatly reduce the carbon dioxide emissions of the ethylene plant.

关 键 词：液化空气储能 乙烯深冷分离 耦合工艺 二氧化碳减排 

分 类 号：TK02[动力工程及工程热物理] TQ221.211[化学工程—有机化工]