低温甲醇洗工艺能量回收技术应用研究

发布时间：2018-06-15 08:13

本文选题：过程控制 + 能量回收　；参考：《河北科技大学》2015年硕士论文

【摘要】：目前能源紧张和能源利用率低的问题越来越严重,而低温甲醇洗工艺中高压富液能量浪费的现象已经引起科研人员的关注。针对这一现状,在低温甲醇洗工艺中加入以透平泵机组为核心的能量回收装置,并对该装置运行的回收系统进行研究。低温甲醇洗中能量回收装置是通过工艺过程中的高压液体做功,带动透平泵的转子旋转,从而实现能量的回收和利用。工艺中余压能量回收装置的应用,不仅可以实现能量的回收利用,同时也可以为企业带来良好的经济效益。首先对余压能量回收系统整体结构进行分析,提出了以透平泵机组为核心机构的分程控制方案。采用大小不同的三个PID调节阀,在不同的情况下通过控制三个调节阀的开度达到稳定吸收塔液位的目的。对透平泵的回收效率和性能以及工作原理进行了分析。然后对透平泵的启动特性进行了研究,采用505调速器对透平泵启动进行控制,使透平泵按照设定的曲线平稳升速,避开临界转速,减少对透平泵的损坏。为能量回收装置设计合理的润滑油系统,保证透平泵在有一定油压时启动,并运行在合理的润滑区间,以保证甲醇洗塔中的液位稳定。详细设计能量回收装置的控制逻辑和安全联锁逻辑,保证透平泵安全运行,并且不会对原工艺造成负担。根据系统的工艺流程,设计了电气控制系统和人机交互界面。通过分析研究系统工艺的流程图,决定采用S7-300控制器作为系统的控制核心,采用S7-200控制器实现和工厂DCS系统的modbus通讯。详细介绍了编程软件和用到的各个模块以及通讯连接的设置,达到了系统的智能控制和稳定的目的。利用博途软件设计了能量回收系统的监控界面、参数界面、PID调试界面以及报警界面等,使用户更直观方便的看到系统的运行状况。监控界面的引入既保证了系统的安全运行,也实现了整个系统的智能化。
[Abstract]:At present, the problems of energy shortage and low energy efficiency are becoming more and more serious. However, the phenomenon of high pressure and rich liquid energy waste in low temperature methanol washing process has attracted the attention of researchers. In view of this situation, the energy recovery unit with turbine pump unit as the core is added to the low temperature methanol washing process, and the operating recovery system of the unit is studied. The energy recovery device in low temperature methanol washing is to drive the rotor rotation of the turbine pump through the work done by the high pressure liquid in the process of process, so as to realize the recovery and utilization of energy. The application of the residual pressure energy recovery device in the process can not only realize the recovery and utilization of energy, but also bring good economic benefits to enterprises. Firstly, the overall structure of the residual pressure energy recovery system is analyzed, and a scheme of split range control with the turbine pump unit as the core mechanism is put forward. Three pid control valves of different sizes are used to stabilize the liquid level of the absorber by controlling the opening of the three control valves under different conditions. The recovery efficiency, performance and working principle of turbine pump are analyzed. Then the start-up characteristics of the turbine pump are studied, and the turbine pump is controlled by 505 governor, which can make the turbine pump rise steadily according to the set curve, avoid the critical speed and reduce the damage to the turbine pump. A reasonable lubricating oil system is designed for the energy recovery unit to ensure that the turbine pump starts at a certain oil pressure and runs in a reasonable lubricating zone in order to ensure the stability of the liquid level in the methanol washing tower. The control logic and the safety interlock logic of the energy recovery device are designed in detail to ensure the safe operation of the turbine pump and to avoid the burden on the original process. According to the process flow of the system, the electrical control system and man-machine interface are designed. By analyzing the process flow chart of the system, it is decided that the S7-300 controller is used as the control core of the system, and the S7-200 controller is used to realize the communication with the modbus system of the factory. The programming software, the modules used and the setting of communication connection are introduced in detail. The intelligent control and stability of the system are achieved. The monitoring interface, pid debugging interface and alarm interface of the energy recovery system are designed by using the Boto software, so that the user can see the running condition of the system more intuitively and conveniently. The introduction of monitoring interface not only ensures the safe operation of the system, but also realizes the intelligence of the whole system.
【学位授予单位】：河北科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ028.25

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