PLC尿素合成塔控制系统设计+文献综述.docVIP

PLC尿素合成塔控制系统设计+文献综述 摘要：随着工业自动化水平的迅速提高以及计算机在工业领域的广泛应用，人们对工业自动化的要求越来越高，种类繁多的控制设备和过程监控装置在工业领域的应用，使得传统的工业控制软件已无法满足工厂的各种要求。通用工业自动化组态软件的出现为解决上述实际工业问题提供了一种新的方法。同时随着PLC在工业上更加广泛的应用使得二者能够很好的结合来实现工业控制效果。在尿素的生产过程中，尿素合成塔主要起到甲铵脱水的作用。由于高压的液氨与二氧化碳混合后，反应很快生成甲铵，而甲铵脱水生成尿素的反应速度很慢，为了保证二氧化碳的高转化率，物料在合成塔内应有足够的时间和恒定的压力、温度。本文以尿素合成塔为对象，利用力控软件以及PLC的结合应用，设计尿素合成塔的控制系统。6155 关键词： 尿素合成塔；PLC；力控 The urea reactor control system design Abstract: With the rapid increase of the level of industrial automation and computer widely used in the industrial field, the increasingly high demand for a wide range of control equipment and process monitoring devices in industrial applications, the traditional industrial control software for industrial automationunable to meet the various requirements of the plant. The emergence of generic industrial automation configuration software provides a new approach to solve the real industrial problems. At the same time，as PLC are more widely used in industry combination of the two can achieve a good industrial control. In the urea production process, the urea reactor mainly play the role of ammonium carbamate dehydration. Due to the high pressure of the liquid ammonia and carbon dioxide after mixing, the reaction was quickly generate a carbamate, ammonium carbamate by dehydration the urea reaction rate is very slow, in order to ensure a high conversion rate of the carbon dioxide, the material should have sufficient time in the synthesis column and a constant pressure, temperature. This Paper is about the urea reactor object, the use of force-control software, and combined with the application of the PLC, to design the urea reactor monitoring device and urea reactor temperature control. 5.3.2 回路输入输出变量的数值转换方法15 5.5S7-200程序设计流程图16 5.6 梯形图17 5.6.1 程序的启停18 5.6.2 子程序21 5.6.3 中断程序，PID的计算23 5.7 力控组态软件设计24 6 结论34 致谢35 主要参考文献36 1.引言 1.1 课题的背景和目的 随着工业自动化水平的迅速提高以及计算机在工业领域的广泛应用，人们对工业自动化的要求越来越高，种类繁多的控制设备与过程监控装置在工业领域的应用，使得传统的工业控制软件已无法满足人们的各种要求。通用工业自动化组态软件的出现为解决上述实际工业问题提供了一种新的方法。与此同