毕业设计---乙苯装置控制系统设计.doc

乙苯装置控制系统设计 摘 要 随着我国石油化工行业的不断发展，制乙苯的技术也在不断进步。乙苯是石油加工重要的化工原料。乙苯装置也是石油加工重要的一道工序。乙苯装置的工艺流程主要特点是通过控制烷基化反应条件使催化剂反应系统由两相变为单相从而提高了乙苯收率减少了三氯化铝催化剂用量,简化了流程,节省了生产费用加强回收尾气中的部分氯化氢既减少了污染又提高了经济效益本文研究乙苯工艺流程，进行制乙苯过程的详细设计。本篇文章详细介绍了乙苯装置的原理及发展现状，对精制过程中所有工艺过程进行了研究。围绕乙苯工艺流程及控制进行研究，对乙苯工艺流程及各主要设备进行了详细的说明，设计了一套完整的乙苯装置控制系统，在设计中对每个部分进行了详细设计和优化，运用了单回路控制、串级控制、前馈控制、变比值控制和双闭环控制等控制方案，并根据控制需要、环境要求、工艺特点、仪器优缺点等确定了各种仪表及调节阀的型号。该流程简单，生产能力大。由于条件缓和，所用材料和耐压等级的要求也可以低些，操作中氢油比也很小，又不采用循环气，所以能耗低，装置操作费用低，使得设计合理。 本文针对乙苯装置控制过程进行了详细的设计，通过各种控制方案实现了最终控制目标。苯循环使用，甲苯作为副产品；在乙苯塔塔顶蒸出乙苯，送成品贮罐，塔底馏分进入多乙苯塔；多乙苯塔塔顶蒸出二乙苯，送入烷基化反应器。乙苯装置控制系统，近年来主要根据苯烷基化法的主要方法生产乙苯。 关键词：乙苯；烃化反应；过程控制 Design ofthylbenzene Unit Control System Abstract Along with the continuous development of the petrochemical industry, manufacturing technology has been steadily progressing ethylbenzene. Ethylbenzene is an important oil-processing chemicals. Ethylbenzene unit is also important to an oil processing process. Ethylbenzene process device by controlling the main characteristics of the alkylation conditions，the catalyst into the reaction system consists of two-phase single-phase, Thereby increasing the yield of ethylbenzene, reducing the amount of aluminum chloride catalyst to simplify the process, saving production costs; Part of the tail gas to enhance recovery of hydrogen chloride, which reduces pollution and increases economic efficiency. In this paper, ethylbenzene process, ethylbenzene process for the detailed design. This article introduces the principle and ethylbenzene unit development status of the refining process for all process were studied. Design a complete set of ethylbenzene plant control system, In the design of each part of the detailed design and optimization, Using a single-loop control, cascade control, feed forward control, variable ratio control and closed loop control, dual control scheme，And under control needs, environmental requirements, technical characteristics, advantages and disadvantages of such instruments to determine a vari