低浓度有机废气催化燃烧工艺过程自动控制设计本科生毕业论文（设计）.docVIP

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 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催化燃烧技术使有害物质的分解温度降低到280～450 ℃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 本文针对低浓度有机废气催化燃烧工艺流程分析机理特性， 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。 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 WinCC集成监控 MATLAB The catalytic combustion process automatic control design for low concentrations of organic waste gas Abstract PTA 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 technology, 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 burning 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 are as follows: 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 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 design the control process scheme. According to the control design industry standard, we select each measurement instrum