烟气脱硝系统氨水匹配定投子系统的设计与实现
发布时间：2019-01-26 19:32
【摘要】：目前,从环境大数据来看,我国大气污染形势非常严峻,而且氮氧化物排放总量排在世界第一。大气污染越来越受到相关部门重视,而且国家还确立了许多相关的排放标准。所以,在生产过程中,工业锅炉进行烟气脱硝改造迫在眉睫。本课题是以某工业锅炉烟气脱硝改造项目为依托,其主要目的是开发一套能够精确喷氨量,降低氮氧化物排放量,使其能够符合国家排放规定的控制系统。论文首先介绍了与本课题相关的国内外研究现状和发展趋势、课题研究背景与意义、并在此基础上对课题的主要内容进行了深入研究。其次对工业锅炉被控制量展开描述和详细分析,包括整个SNCR脱硝技术的工艺流程组成,以及SNCR技术控制系统应用原理。并在此基础上,熟悉相关工艺要求和技术参数要求,按要求设计系统相关控制策略。完成以模糊PID调节作主调节器,氨水流量PI调节作副调节器,然后形成一个串级控制回路,以此为理论基础,搭建所需被控对象的控制模型,并在MATLAB/Simulink上对其控制策略进行仿真研究和讨论。然后根据实际工程需要完成相关的硬件设计和软件设计工作。硬件设计包括系统各部分的设备选型,系统的硬件组态和网络组态等;软件设计包括SIMATIC PLC相关的编程软件STEP7控制程序以及监控软件WinCC7.0监控画面的设计。实现烟气脱硝氨水匹配定投系统的自动监测和控制,保证氮氧化物的排放量不高于设定值。最后对系统进行初步调试,在此基础上对系统控制运行的稳定性、被控参量的精确度以及执行机构的响应速度进行分析和研究,提出问题并得出相应解决办法。然后对课题所涉及研究的前景进行总结与展望,以及后续研究所努力的方向。
[Abstract]:At present, from the point of view of environmental big data, the situation of air pollution in China is very serious, and the total amount of nitrogen oxide emissions ranks first in the world. More and more attention has been paid to air pollution, and many relevant emission standards have been established. Therefore, in the production process, industrial boiler flue gas denitrification is urgent. This project is based on the project of flue gas denitrification of a certain industrial boiler. The main purpose of this project is to develop a control system which can accurately inject ammonia and reduce the discharge of nitrogen oxides, so that it can meet the national emission regulations. Firstly, this paper introduces the current situation and development trend of the research at home and abroad, the background and significance of the research, and further studies the main contents of the subject. Secondly, the controlled amount of industrial boiler is described and analyzed in detail, including the composition of the whole SNCR denitrification process and the application principle of the SNCR technology control system. On this basis, familiar with the relevant process requirements and technical parameters, design the system control strategy according to the requirements. The fuzzy PID regulation is used as the main regulator, the ammonia flow rate PI regulation is used as the secondary regulator, and then a cascade control loop is formed. Based on this theory, the control model of the required controlled object is built. The control strategy is simulated and discussed on MATLAB/Simulink. Then according to the actual engineering needs to complete the hardware design and software design work. The hardware design includes the equipment selection of each part of the system, the hardware configuration and network configuration of the system, and the software design includes the design of the STEP7 control program related to SIMATIC PLC and the WinCC7.0 monitoring screen of the monitoring software. The automatic monitoring and control of flue gas denitrification ammonia matching system is realized, and the emission of nitrogen oxides is not higher than the set value. Finally, the system is preliminarily debugged. On this basis, the stability of the system control operation, the accuracy of the controlled parameters and the response speed of the actuator are analyzed and studied, and the problems are put forward and the corresponding solutions are obtained. Then the future of the research involved in the subject is summarized and prospected, as well as the direction of the follow-up research efforts.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X701
[Abstract]:At present, from the point of view of environmental big data, the situation of air pollution in China is very serious, and the total amount of nitrogen oxide emissions ranks first in the world. More and more attention has been paid to air pollution, and many relevant emission standards have been established. Therefore, in the production process, industrial boiler flue gas denitrification is urgent. This project is based on the project of flue gas denitrification of a certain industrial boiler. The main purpose of this project is to develop a control system which can accurately inject ammonia and reduce the discharge of nitrogen oxides, so that it can meet the national emission regulations. Firstly, this paper introduces the current situation and development trend of the research at home and abroad, the background and significance of the research, and further studies the main contents of the subject. Secondly, the controlled amount of industrial boiler is described and analyzed in detail, including the composition of the whole SNCR denitrification process and the application principle of the SNCR technology control system. On this basis, familiar with the relevant process requirements and technical parameters, design the system control strategy according to the requirements. The fuzzy PID regulation is used as the main regulator, the ammonia flow rate PI regulation is used as the secondary regulator, and then a cascade control loop is formed. Based on this theory, the control model of the required controlled object is built. The control strategy is simulated and discussed on MATLAB/Simulink. Then according to the actual engineering needs to complete the hardware design and software design work. The hardware design includes the equipment selection of each part of the system, the hardware configuration and network configuration of the system, and the software design includes the design of the STEP7 control program related to SIMATIC PLC and the WinCC7.0 monitoring screen of the monitoring software. The automatic monitoring and control of flue gas denitrification ammonia matching system is realized, and the emission of nitrogen oxides is not higher than the set value. Finally, the system is preliminarily debugged. On this basis, the stability of the system control operation, the accuracy of the controlled parameters and the response speed of the actuator are analyzed and studied, and the problems are put forward and the corresponding solutions are obtained. Then the future of the research involved in the subject is summarized and prospected, as well as the direction of the follow-up research efforts.
【学位授予单位】：山东建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X701
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