高含硫天然气净化厂尾气处理控制系统优化与应用

发布时间：2018-05-02 14:09

本文选题：集散控制系统 + 组态　；参考：《北京化工大学》2015年硕士论文

【摘要】：本文是建立在天然气净化厂加氢控制系统的基础之上,并结合天然气净化厂整套生产装置的特点：工艺流程比较繁琐,控制回路相互交错并且相对复杂；净化厂的控制系统(DCS)的控制功能能够起到集中管理的作用,因此套控制系统具有较高的灵敏性、良好的可拓展性以及优良的人机交互能力等,从控制系统的组态原理着手,通过对净化厂最为复杂的两个回路控制进行逐步研究与优化,使其达到：净化操作工可以熟练的进行操作应用、工艺技术人员可以清楚详细的掌握整个生产工艺的控制系统、仪表人员可以为系统正常的运行提供良好的维护保障,最终奠定一个有序生产、稳定控制的生产基础。自动控制系统是一种特殊的控制系统,其不需要人为直接控制,而是按照预定的计划或者提前设定的程序完成整个生产过程的控制。该系统主要包括四个主要部分：控制器、被控对象、执行机构以及变送器,它的主要目的就是为了实现自动化的结果。目前,此项系统获得了较快的发展,而且已经被推广应用到各个生产行业,尤其在生产加工行业更为突出。本课题通过采用双限幅交叉组态与模块编程结合的方式,设计一种欠氧燃烧闭环控制系统。通过对这两个复杂控制回路的研究与优化,达到这种效果：(1)当在炉温超过于设定值的大小时,温度控制器TC-40261先减小配风,再减燃料气；(2)当炉温低于设定值的大小时,温度控制器TC-40261会先提高燃料气的量,通过燃料气的量进一步调整风量,达到配风不过量,生产稳定的目的；(3)最终达到无论过程气量如何变化,在炉温自动控制的情况下,能始终保证整个控制系统处于一个欠氧燃烧存在还原性气体(H2,CO)的状态。
[Abstract]:This paper is based on the hydrogenation control system of the natural gas purification plant, and combines the characteristics of the whole production unit of the natural gas purification plant: the process is relatively cumbersome, the control circuit is interlaced and relatively complex; The control function of the control system (DCS) of the purification plant can play the role of centralized management. Therefore, the set of control system has high sensitivity, good expansibility and excellent human-computer interaction ability, etc., which starts from the configuration principle of the control system. Through the study and optimization of the two most complex loop control in the purification plant, it is achieved that the purification operator can operate and apply skillfully, and the process technician can master the control system of the whole production process clearly and in detail. Instrumentation personnel can provide good maintenance and guarantee for the normal operation of the system, and finally lay a production foundation for orderly production and stable control. Automatic control system is a kind of special control system, which does not need direct artificial control, but completes the control of the whole production process according to the scheduled plan or the program set in advance. The system consists of four main parts: controller, controlled object, actuator and transmitter. The main purpose of the system is to realize the result of automation. At present, the system has been rapidly developed, and has been widely used in various production industries, especially in the production and processing industry. In this paper, a closed loop control system for underoxygen combustion is designed by combining double limiting cross configuration with module programming. Through the research and optimization of these two complex control loops, the effect is achieved: 1) when the furnace temperature exceeds the set value, the temperature controller TC-40261 first reduces the distribution of air, then reduces the fuel gas (FG) 2) when the furnace temperature is lower than the set value, the temperature controller reduces the distribution of air first, and then reduces the fuel gas by 2) when the furnace temperature is below the set value, The temperature controller TC-40261 will first increase the amount of fuel gas, through the amount of fuel gas to further adjust the air volume, to achieve the purpose of air distribution is not excessive, and the purpose of production stability is to finally achieve no matter how the process gas volume changes, under the condition of automatic control of furnace temperature, It can always ensure that the whole control system is in a state where there is a reducible gas H _ 2CO _ 2 in underoxygen combustion.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X743;TP273

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