PCS7天然气处理厂综合计算机监控系统设计
关键词： PCS 7；天然气；测控系统；PID；可靠性
The Integrated Computer Monitoring and Control System Design of Natural Gas Treatment Plant
Abstract：Natural gas is a kind of green and clean energy, which is quite popular. Natural gas treatment plant is the indispensable important link in the development and utilization of natural gas. To make the natural gas treatment plant run smoothly, safely, high-efficiently and with high quality, there must have a complete and reliable monitoring and control system. The system also should have good man-machine interface. This article is specific to the actual natural gas treatment plant, which is based on SIEMENS PCS 7. It connects process control system (PCS), emergency shutdown (ESD) and fire and gas system (FGS) with the man-machine interface together, adopting three layers of communications network, and constituting a complete, safe, comprehensive and reliable monitoring system solution program. It describes the PID control loop and tuning, and makes the analysis and calculation to various parts of the system reliability at last.
Keywords：PCS 7; natural gas; monitoring and control system; PID; reliability
目录
1天然气处理厂工艺流程 1
1.1 工艺流程描述 1
1.1.1 收发球装置 1
1.1.2 段塞流捕集器 1
1.1.3 天然气烃露点控制系统 1
1.1.4 天然气脱碳系统 1
1.1.5 天然气压缩机系统 1
1.1.6 天然气脱水系统 3
1.1.7 辅助系统 3
1.2 测量控制输入/输出点分类和统计 3
1.2.1 PCS 硬接线I/O统计表 3
1.2.2 PCS 与现场成套设备PLC数据链路统计表 4
1.2.3 ESD 硬接线I/O统计表 4
1.2.4 FGS 硬接线I/O统计表 5
2天然气处理厂监控系统 6
2.1 天然气处理厂测控系统组成 6
2.2 三层通信网络 6
2.2.1 厂级总线层通信网络 6
2.2.2 控制总线层通信网络 8
2.2.3 现场总线层通信网络 8
2.3 PCS和SIS两大系统 9
2.3.1 PCS过程控制系统 9
2.3.2 SIS仪表安全系统 11
2.4 人机界面--操作站 17
2.5 时间同步 18
2.6 计算机接地技术 18
3 PID闭环控制回路和参数整定 19
3.1 PID控制回路 19
3.1.1 定值单回路控制系统 19
3.1.2 偏置控制系统 21
3.1.3 分程控制系统 22
3.1.4 串级控制系统 23
3.2 PID控制回路的参数整定 25
3.2.1 采样周期的选择 25
3.2.2 PID控制参数的整定 26