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吉林化工学院信控学院专业综合设计说明书换热站控制系统设计学生学号：学生姓名：专业班级：指导教师：职称：起止日期：2016.08.29～2016.09.18吉林化工学院JilinInstituteofChemicalTechnology吉林化工学院信息与控制工程学院专业综合设计说明书I专业综合设计任务书一、设计题目换热站控制系统设计二、适用专业测控技术与仪器专业三、设计目的1.了解换热机组工艺流程；2.了解温度、压力、液位及流量等工艺参数的信号测量及传输方法；3.掌握PLC各种典型信号（二线制、四线制变送器及热电阻、热电偶）接线方法；4.掌握PID控制算法及其在PLC中的编程和离线仿真及调试方法；5.熟悉自控工程实践设计及应用的一般步骤和实现方法。四、设计任务及要求某换热站工艺流程如下图所示，一次网进水由热水锅炉加热，经板式换热器与二次网进行换热后再返回锅炉。二次网循环水由循环泵P201加压后进行换热器，加热后进入管网对居民住户进行循环供热。控制要求：1．二次网供水温度PID控制：通过一次网调节阀V101进行供水温度定值控制；2．二次网供水压力PID控制：通过循环泵调频进行供水压力定值控制；3．补水箱水位限值控制：水箱水位小于低限时开补水阀，大于高限时关补水阀；4．二次网回水压力限值控制：回水压力小于低限时启动补水泵，大于高限时停泵；5．连锁控制（选做）：水箱水位小于低低限时，补水泵禁止运行；二次网回水压力小于低低限时，循环泵禁止运行；6．流量/热量累计（选做）：增加一次网流量和回水温度仪表，实现流量和热量累计。五、设计内容换热站控制系统设计II1.总结IO点表，并进行PLC系统选型；2.设计控制系统IO信号接线图纸；3.按上述控制要求编写和设计PLC控制程序；4.设计上位机操作画面，包括工艺流程画面、操作画面、趋势及报警等画面；5.撰写设计说明书。六、设计时间及进度安排设计时间共三周,具体安排如下表：周次设计内容设计时间第一周熟悉工艺流程和控制要求，总结IO点表，查找相关设计资料，进行PLC系统选型，循环泵和补水泵电气控制原理设计（选做），仪表选型（选做），IO信号接线设计。基本PLC程序设计，掌握二、四线制及热电阻接线方法，掌握信号传输与变换直线转换计算。2016.8.29-2016.9.4第二周PLC程序设计；操作画面设计；趋势图和报警画面设计（选做）；仿真调试。学习PID控制器基本工作原理，掌握控制系统离线仿真调试方法。2016.9.4-2016.9.11第三周完善程序和画面，撰写专业综合设计说明书2016.9.11-2016.9.18七、指导教师评语及学生成绩指导教师评语：2016年月日成绩指导教师(签字)：吉林化工学院信息与控制工程学院专业综合设计说明书III目录第1章摘要················································································································1第2章换热站系统的工艺·····························································································22.1换热站系统的构成·····························································································22.2系统的工艺流程·······························································································22.3系统的功能及控制要求······················································································2第3章系统硬件选型···································································································43.1PLC的选型·····································································································43.2I/O点表·········································································································43.3电源选型·········································································································43.4CPU选型·········································································································53.5数字量输入输出模块选型···················································································53.6硬件选型表······································································································5第4章换热站的接线设计·····························································································64.1主回路和二次回路····························································································64.2数字量输入/输出回路························································································64.3模拟量输入/输出回路························································································7第5章下位机控制系统设计··························································································85.1分析控制要求··································································································85.2硬件组态·········································································································85.3编辑符号表······································································································85.4编辑下位机梯形图程序·······················································································9第6章上位机监控画面设计························································································136.1Wincc组态软件简介························································································136.2Wincc组态软件使用························································································136.3变量的链接····································································································146.4画面的建立····································································································156.5液位报警画面的建立·······················································································176.6变量记录与温度历史趋势·················································································176.7压力实时趋势································································································186.8PID仿真调节画面···························································································19结论························································································································20参考文献···················································································································21吉林化工学院信息与控制工程学院专业综合设计说明书1第1章摘要随着大规模集成电路和微处理器在PLC中的应用，使PLC的功能不断得到增强，产品得到飞速发展。由于PLC具有通用性强、使用方便、适应面广、可靠性高、抗干扰能力强、编程简单等特点。因此PLC在工业自动化控制特别是顺序控制中的地位，在可预见的将来，是无法取代的，备受国内外工程技术人员和工业界厂商的极大关注。通过PLC和上位机对二次网供水管道的压力和二次网回水管道的压力进行自动监控，同时在PLC中采用PID算法，从而可以通过控制循环泵和补水泵的转速来实现恒压控制，同时也通过对二次网供水温度的自动监控，从而通过控制一次网进水处的调节阀开度来实现恒温控制，实现了换热站系统的自动运行与人机交互。文中介绍了一种基于PLC和WINCC的温度自动控制系统方案，针对过程控制装置中的换热站供水温度控制系统，通过介绍系统软硬件构成及其特点。论述了PLC和WINCC如