沼气脱硫过程控制系统的设计与实现

发布时间：2018-01-03 01:16

本文关键词：沼气脱硫过程控制系统的设计与实现　出处：《济南大学》2015年硕士论文　论文类型：学位论文

更多相关文章： 沼气脱硫 PLC 组态监控 PID控制

【摘要】：沼气作为可再生清洁能源,在污染问题日益凸显的情况下逐步被社会重视。由于沼气中通常含有硫化氢,燃烧之后易生成二氧化硫等有害物质,因此在使用沼气之前必须将其中的硫化氢除去。因为硫化氢具有强烈的毒性,对人体能造成伤害,所以应实现脱硫系统自动化,减少人工操作步骤。本论文课题来源于某自动化工程公司的沼气项目,设计研发一套沼气脱硫自动控制系统,实现脱硫自动控制、运行状态显示、风机变频调速、故障监控报警等功能,在提高自动化水平的前提下,保证脱硫效率,确保脱硫系统能够安全稳定运行。首先,了解了沼气脱硫的意义,根据沼气脱硫工艺流程,分析工艺操作过程,给出一个脱硫控制系统的设计方案。介绍了沼气脱硫控制系统的相关设备,包括触摸屏、模拟量输入输出模块、变频器等。其次,对脱硫控制系统进行了软件设计,完成了S7-200PLC的控制系统梯形图设计。受组分浓度大小不同的影响,风机开度也需要随之进行调整,从而保证输送的空气能够充分反应掉,提高脱硫液的再生效率。本系统依据实时检测到的组分浓度,利用PID控制器计算出相应的空气进量,并通过变频器对风机进行调整。在设计脱硫液补液、排液以及循环泵启停的时候,不同的操作须对应不同的启停时间。然后,设计触摸屏监控界面,利用MCGS组态软件完成脱硫控制系统监控界面设计,在组态环境下,建立新工程,构造实时数据库、主控窗口和设备窗口等,实现对系统运行的实时在线监控,对出现的状况进行及时报警。最后,在现场对系统硬件进行组装,着重检查了可能出现的问题,对控制系统进行调试。调试证明,系统能够稳定运行,实现高效脱硫。
[Abstract]:Biogas, as a renewable and clean energy, has been paid more and more attention by the society under the condition of increasingly serious pollution problem. Because biogas usually contains hydrogen sulfide, it is easy to produce sulfur dioxide and other harmful substances after combustion. Therefore, hydrogen sulfide must be removed before the use of biogas. Since hydrogen sulfide is highly toxic and harmful to human beings, the desulfurization system should be automated. This paper comes from the biogas project of a certain automation engineering company, designs and develops a set of automatic control system of biogas desulphurization, realizes the automatic control of desulfurization, and shows the running state. Fan frequency control, fault monitoring and alarm functions, in the premise of improving the level of automation, to ensure the efficiency of desulphurization, to ensure the safe and stable operation of the desulfurization system. First, understand the significance of biogas desulphurization. According to the process flow of biogas desulphurization, the operation process is analyzed, and a design scheme of desulfurization control system is given. The related equipments of the control system are introduced, including touch screen, analog input and output module. Secondly, the software design of desulphurization control system is carried out, and the ladder diagram of S7-200 PLC control system is designed, which is affected by the different concentration of components. Fan opening also needs to be adjusted to ensure that the air can be fully reacted to improve the efficiency of desulfurization fluid regeneration. This system based on the real-time detection of component concentration. The PID controller is used to calculate the corresponding air intake, and the fan is adjusted by frequency converter. During the design of desulphurization fluid rehydration, drainage and circulation pump start and stop. Different operation should correspond to different starting and stopping time. Then, the touch screen monitoring interface is designed, and the monitoring interface of desulphurization control system is designed by using MCGS configuration software. In the configuration environment, a new project is established. The real-time database, main control window and equipment window are constructed to realize real-time on-line monitoring of the system operation and timely alarm. Finally, the hardware of the system is assembled in the field. The possible problems are examined emphatically and the control system is debugged. The debugging proves that the system can run stably and realize high efficiency desulphurization.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X701.3;TP273

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