年产30万吨乙烯裂解气脱甲烷系统工艺设计(毕业设计).doc

30万吨/年乙烯裂解气脱甲烷系统工艺设计 PAGE 2 - 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 Abstract Abstract: 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 flow 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 requirements, 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. 目 录 TOC \o 1-4 \u 1 绪论 PAGEREF _To\h 1 1.1 乙烯裂解气分离技术的现状 PAGEREF _To\h 1 1.2 乙烯脱甲烷系统设计的目的、意义 PAGEREF _To\h 1 1.3 设计过程主要解决的问题 PAGEREF _To\h 2 1.4 设计的指导思想 PAGEREF _To\h 2 2 脱甲烷系统流程及基础数据 PAGEREF _To\h 3 2.1 脱甲烷系统流程的确定 PAGEREF _To\h 3 2.1.1 后脱氢高压深冷法 PAGEREF _To\h 3 2.1.2 前脱氢高压深冷法 PAGEREF _To\h 3 2.1.3 带膨胀机的前脱氢高压深冷法 PAGEREF _To\h 3 2.1.4 带C2回收塔的高压脱甲烷法 PAGEREF _To\h 3 2.1.5 前脱氢低压深冷法 PAGEREF _To\h 4 2.1.6 结论 PAGEREF _To\h 4 2.2 设计基础数据 PAGEREF _Toc75166760