低浓度有机废气催化燃烧工艺过程自动控制毕业设计

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1、 . 毕业设计(论文)课题名称低浓度有机废气催化燃烧工艺过程自动控制设计院（系）专 业姓 名学 号指导教师2014 年 5 月 25日41 / 50低浓度有机废气催化燃烧工艺过程自动控制设计摘要PTA氧化反应尾气是PTA装置排出的数量最大的有害气体，其中VOCs的含量为中、低浓度，若采用回收技术法，存在处理效率低、装置体积大、成本高等缺点。降解技术中目前较为成熟的是催化燃烧技术，借助于催化剂的作用使有害物质的分解温度降低到280450 ，具起燃温度较低、氧化温度低、能耗低、效率高，NOx生成量极少，无二次污染物等优点。本论文以低浓度有机废气过程为研究对象，进行工艺过程自动控制部分设计，研究容如

2、下：1. 本文针对低浓度有机废气催化燃烧工艺流程，认真分析催化燃烧反应器、换热器的机理特性，合理确定自动控制回路的被控变量与操纵变量配对模式，分别采用PID控制策略、前馈控制和串级控制策略设计了控制过程方案。2. 根据自控设计行业标准分别对控制所需压力、温度、流量等仪表进行选型，给出具体的型号。并根据系统的特性与要求选择，确定自动阀门的流量特性与气动特性。3. 采用西门子公司Simatic WinCC 工控组态软件设计催化燃烧过程上层集成监控平台，用电脑将过程变量存档并实现历史数据的存档与显示。再运用OPC通讯技术实现了MATLAB与WinCC间数据的实时交换。关键词：催化燃烧 控制系统设计

3、仪表选型WinCC集成监控MATLABThe catalytic combustion process automatic control design for low concentrations of organic waste gasAbstractPTA oxidation reaction is the maximum number of harmful exhaust gases discharged by PTA plant, where the content of VOCs is in a low concentration. If using recycling techn

4、ology, there are some disadvantages including low efficiency, high unit volume, high cost and so on. Catalytic combustion technology is currently the most mature degradation technology, the decomposition temperature of harmful substances reduced to 280 450 by means of a catalyst role, with lower bur

5、ning temperature, oxidation temperature, low energy consumption, high efficiency, NOx generation minimal amount, no secondary pollutants and a lot of advantages. In this paper, we use low concentration of organic waste process as research object, designing automatically controlled process, studies a

6、re as follows:1. This paper is based on the catalytic combustion of low concentrations of organic waste process, carefully analyzed the mechanism characteristics of the catalytic combustion reactor, heat exchanger, and by the characteristics of the system , disturbance and control goals analysis, we

7、 determined the controlled variables and manipulate variables of each loop,and respectively use PID control strategy, ratio control, the feedforward control and cascade control strategy to designthe control process scheme.2. According to the controldesign industry standard, we select each measuremen

8、t instrument, analog instrument, control instrument and the characteristics of the valve in the system, give the specific models.We select each automatic valves flow characteristics and aerodynamic characteristics according to the characteristics of the system and the goals.3. The upper catalytic co

9、mbustion process integrated monitoring platform is designed using Siemens Simatic WinCC industrial control configuration software design, using a computer to archive process variables and achieve historical data archiving and display. Then OPC technology is used to achieve data exchange communicatio

10、n between MATLAB and the WinCC.Keywords:Catalytic combustion, control system design, WinCC integrated monitoring, MATLAB目录摘要IAbstractII目录IV第一章绪论11.1课题背景与意义11.2催化燃烧基本原理21.3化学反应器的基本控制策略31.4控制系统仿真软件的应用研究现状41.5仿真模型与监控平台间的通讯技术41.6化工过程集成监控软件5第二章低浓度有机废气催化燃烧的工艺简介与特性分析72.1 低浓度有机废气催化燃烧工艺流程72.2 低浓度有机废气催化燃烧工艺装置

11、特性82.2.1温度特性82.2.2压力特性82.2.3流量特性82.3催化燃烧工艺扰动分析92.3.1进料流量与进料成分92.3.2进料温度或者进料热熵92.3.4催化剂进料的流量10第三章催化燃烧工艺控制方案设计113.1 控制目标分析113.2 被控变量与操作变量的选择113.3 阀门特性选取123.4 控制系统设计133.4.1 E-101流量控制143.4.2 管道回路流量控制153.4.3 D101催化燃烧反应器控制153.4.4 电加热器温度控制16第四章控制方案仪表硬件选型184.1自动控制系统仪表选型原则184.2自动控制系统仪表选型194.2.1温度仪表194.2.2流量仪