汽水换热过程计算机控制系统的设计与开发
发布时间：2018-10-14 13:17
【摘要】：换热站是整个供暖环节的核心,换热站的稳定、可靠的运行是保证工厂冬季正常生产重要条件,设计和开发自动控制换热系统有很重要意义。本文以汽-水换热过程为研究对象,在国家科技支撑计划“选矿过程全流程先进控制技术”(2012BAF19G01)和重大自动化工程“酒泉钢铁集团公司新建400万吨铁选厂综合自动化系统”的支持下,进行换热站计算机控制系统设计并开发。换热站控制系统的控制目标是保证二次网供水总管温度稳定在设定值,以保证供热质量。然而换热系统不仅具有纯滞后、大惯性、参数时变等特点,而且换热过程状态参数之间相互干扰,传统的单回路控制难以快速地消除干扰并维持控制温度稳定。针对以上问题,本文主要工作内容如下：1.提出基于串级控制和前馈-反馈控制的汽水换热过程控制策略。汽水换热控制系统最终目的是保证供水温度和供水压力稳定。由于蒸汽压力波动对蒸汽流量存在干扰且换热过程具有多变量、大惯性等特点,因此对供水温度采用串级控制；补水压力对供水压力控制存在干扰,因此对供水压力采用前馈-反馈控制：建立换热过程数学模型,最后通过仿真验证控制策略的可行性。2.设计汽水换热过程计算机控制系统。分为硬件设计和软件设计。硬件设计主要针对换热过程中所需温度、压力检测仪表及执行机构进行选型,同时设计系统网络结构、换热站内PLC柜、工程师站等。软件设计主要进行上位机监控功能设计包括状态监控设计、故障报警设计和历史趋势设计等；下位机控制功能设计,包括设备启停控制设计、回路控制设计和联锁控制设计等；最后对通讯功能进行设计。3.汽水换热过程计算机控制系统软件开发。主要针对控制系统状态监视功能、故障报警功能和历史趋势等功能,通过RSview32软件,进行上位机监控软件系统开发；针对设备启停控制功能、回路控制功能和联锁控制等功能,通过RSlogix5000软件,进行下位机控制操作功能软件的开发。最后对通讯软件进行配置。4.汽水换热过程计算机控制系统功能验证。以实际工程为背景,通过实际控制系统运行结果,对计算机控制系统进行监控管理功能和设备操作功能的验证。
[Abstract]:The heat exchange station is the core of the whole heating link. The stable and reliable operation of the heat exchange station is an important condition to ensure the normal production of the factory in winter. It is of great significance to design and develop the automatic control heat transfer system. In this paper, the steam-water heat transfer process is studied. Supported by the National Science and Technology support Plan "Advanced Control Technology for the whole process of Ore dressing" (2012BAF19G01) and the major automation project "Jiuquan Iron and Steel Group Company, a new 4 million ton iron separation plant comprehensive automation system", Design and develop the computer control system of heat exchange station. The control goal of the heat exchange station control system is to ensure that the temperature of the secondary network water supply main pipe is stable at the set value, so as to ensure the heating quality. However, the heat transfer system not only has the characteristics of pure lag, large inertia and time-varying parameters, but also interferes with each other among the state parameters of the heat transfer process. The traditional single-loop control is difficult to eliminate the disturbance and maintain the control temperature stability quickly. In view of the above problems, the main work of this paper is as follows: 1. A control strategy for steam and water heat transfer process based on cascade control and feedforward-feedback control is proposed. The ultimate purpose of the steam-water exchange control system is to ensure the stability of water supply temperature and water supply pressure. Because steam pressure fluctuation interferes with steam flow rate and heat transfer process has the characteristics of multivariable and large inertia, cascade control is adopted for water supply temperature, and supplementary water pressure interferes with water supply pressure control. Therefore, feedforward feedback control is used to control the water supply pressure. The mathematical model of heat transfer process is established. Finally, the feasibility of the control strategy is verified by simulation. 2. The computer control system of steam-water heat transfer process is designed. It is divided into hardware design and software design. The hardware design is mainly aimed at the selection of temperature, pressure measuring instruments and actuators needed in the heat transfer process. At the same time, the network structure of the system, the PLC cabinets in the heat transfer station, the engineer station and so on are designed. The software design mainly includes the status monitoring design, fault alarm design and historical trend design, the lower computer control function design, including equipment start and stop control design, loop control design and interlock control design, etc. Finally, the communication function is designed. 3. Software development of computer control system for steam-water heat transfer process. Aiming at the monitoring function of control system status, the function of fault alarm and historical trend, the development of monitoring software system of upper computer through RSview32 software, the function of starting and stopping control function of equipment, the function of loop control and interlocking control, etc. Through the RSlogix5000 software, the development of the lower computer control function software. Finally, the communication software configuration. 4. Function verification of computer control system for steam-water heat transfer process. Based on the actual engineering, the computer control system is verified by monitoring and management function and equipment operation function through the operation result of the actual control system.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU995
本文编号：2270576
[Abstract]:The heat exchange station is the core of the whole heating link. The stable and reliable operation of the heat exchange station is an important condition to ensure the normal production of the factory in winter. It is of great significance to design and develop the automatic control heat transfer system. In this paper, the steam-water heat transfer process is studied. Supported by the National Science and Technology support Plan "Advanced Control Technology for the whole process of Ore dressing" (2012BAF19G01) and the major automation project "Jiuquan Iron and Steel Group Company, a new 4 million ton iron separation plant comprehensive automation system", Design and develop the computer control system of heat exchange station. The control goal of the heat exchange station control system is to ensure that the temperature of the secondary network water supply main pipe is stable at the set value, so as to ensure the heating quality. However, the heat transfer system not only has the characteristics of pure lag, large inertia and time-varying parameters, but also interferes with each other among the state parameters of the heat transfer process. The traditional single-loop control is difficult to eliminate the disturbance and maintain the control temperature stability quickly. In view of the above problems, the main work of this paper is as follows: 1. A control strategy for steam and water heat transfer process based on cascade control and feedforward-feedback control is proposed. The ultimate purpose of the steam-water exchange control system is to ensure the stability of water supply temperature and water supply pressure. Because steam pressure fluctuation interferes with steam flow rate and heat transfer process has the characteristics of multivariable and large inertia, cascade control is adopted for water supply temperature, and supplementary water pressure interferes with water supply pressure control. Therefore, feedforward feedback control is used to control the water supply pressure. The mathematical model of heat transfer process is established. Finally, the feasibility of the control strategy is verified by simulation. 2. The computer control system of steam-water heat transfer process is designed. It is divided into hardware design and software design. The hardware design is mainly aimed at the selection of temperature, pressure measuring instruments and actuators needed in the heat transfer process. At the same time, the network structure of the system, the PLC cabinets in the heat transfer station, the engineer station and so on are designed. The software design mainly includes the status monitoring design, fault alarm design and historical trend design, the lower computer control function design, including equipment start and stop control design, loop control design and interlock control design, etc. Finally, the communication function is designed. 3. Software development of computer control system for steam-water heat transfer process. Aiming at the monitoring function of control system status, the function of fault alarm and historical trend, the development of monitoring software system of upper computer through RSview32 software, the function of starting and stopping control function of equipment, the function of loop control and interlocking control, etc. Through the RSlogix5000 software, the development of the lower computer control function software. Finally, the communication software configuration. 4. Function verification of computer control system for steam-water heat transfer process. Based on the actual engineering, the computer control system is verified by monitoring and management function and equipment operation function through the operation result of the actual control system.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU995
【参考文献】
相关期刊论文 前2条
1 李新刚;集中供热热力站微机监控系统的设计[J];电力学报;2000年04期
2 王鸣;一种换热器的变PID参数的控制方法及实现[J];机电工程;2001年03期
相关硕士学位论文 前1条
1 陈瑜;自整定PID控制技术在供热系统中的应用[D];山东大学;2005年
，本文编号：2270576
本文链接：https://www.wllwen.com/kejilunwen/sgjslw/2270576.html
