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年产30万吨乙烯裂解气脱甲烷系统工艺设计(毕业设计).doc
57页1、摘要摘要:在乙烯生产中,脱甲烷系统的能量消耗相当的大,大约是整个分离系统能量的50%,确立一个能量消耗低、投资小、流程简单的脱甲烷系统流程相当的重要。这次设计过程中将首先对几种分离方法做简单的比较,然后选择技术成熟、操作稳定、产品纯度高、能耗低的深冷分离法。从能耗来看,在深冷分离的三种流程中,以顺序流程的能耗最低。流程确立后,将要根据已知产品的产量和要求,对整个脱甲烷系统工艺流程进行相应的计算,确定各部分的操作条件,然后对主要的分离设备的工艺尺寸计算,并做出流程图和主设备图。关键词:乙烯;脱甲烷塔;深冷分离;乙烯生产AbstractAbstract: In the production of ethylene , energy consumption of demethanizing system is rather remarkable, about accupying the separate system of 50% entirely , establish one energy consumption lower , little invest , the simple fl
2、ow of demethanizing system is equal to importance. At first, compared to several kinds of separation methods in this design, then choose mature technology , operate stability , and produce product quality , which is separation by deep refrigeration. According to energy consumption, in separation by deep refrigeration include three kinds, but it is the lowest energy consumption of sequential process. After process established, according to the product of output and the request of process requirem
3、ents, demethanizing system of process flow going on corresponding calculation, and confirm the operation condition of every part, then calculate anyone which are separate equipment, process and dimension. And do the process flow diagram and the main drawing.Keywords: Ethylene; Demethanizer; Separation by deep refrigeration ; Ethylene producing.- 2 -目 录1 绪论11.1 乙烯裂解气分离技术的现状11.2 乙烯脱甲烷系统设计的目的、意义11.3 设计过程主要解决的问题21.4 设计的指导思想22 脱甲烷系统流程及基础数据32.1 脱甲烷系统流程的确定32.1.1 后脱氢高压深冷法32.1.2 前脱氢高压深冷法32.1.3 带膨胀机的前脱氢高压
4、深冷法32.1.4 带C2回收塔的高压脱甲烷法32.1.5 前脱氢低压深冷法42.1.6 结论42.2 设计基础数据52.2.1 设计要求52.2.2 基础数据53 工艺过程计算83.1 分离器的计算83.1.1 分离器的操作参数83.1.2 分离器的工艺计算83.1.2.1 第一分离器83.1.2.2 第二分离器93.1.2.3 第三分离器103.1.2.4 第四分离器113.1.2.5 第五分离器113.1.2 富氢产品和低压甲烷产品123.2 脱甲烷塔的计算123.2.1 进料的确定123.2.2 脱甲烷塔塔板数计算133.2.2.1 塔顶和塔底抽出物料133.2.2.2 塔顶和塔底操作温度、压力153.2.2.3 理论和实际塔板数计算173.2.2.4 脱甲烷塔热量衡算193.2.2.5 换热器及冷箱热负荷计算204 主要设备工艺尺寸计算264.1 压缩机264.1.1 甲烷压缩机264.1.2 去脱乙烷塔原料压缩机284.2 分离器294.3.1 塔径和板间距354.3.2 堰及降液管364.3.3 塔板设计384.3.4 板压降的计算394.3.5 几个极限的校核404.3
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