Application of Rockwell Automation Products in Phase I Project of Natural Gas Utilization in Hebei Province
Abstract: This article describes the application of Rockwell Automation products in the first-phase project of natural gas utilization in Hebei Province, including ControlLogix's automatic control system and SCADA system.
Keywords: gas pipeline ControlLogix SCADA system
The energy structure of Hebei Province is dominated by coal for a long time, accounting for more than 89% of the total energy consumption. The consumption of electricity and gas is relatively small. The irrational structure of this energy species has caused serious air pollution in the entire province. Therefore, we must vigorously adjust the energy structure and use large amounts of natural gas and other clean energy so that the province's resources, environment, and economy will develop in a coordinated manner. Natural gas has environmental advantages that coal and petroleum cannot match. Although the development and utilization of natural gas in China is relatively late, it will be greatly developed at present and for a long time in the future. This provides a historic opportunity for Hebei Province to utilize natural gas resources. The first-phase project of natural gas utilization in Hebei province, the Beijing-Shijiazhuang branch of the Shaan-Jing Line, is a major event that concerns the industrial production of Hebei Province, the people’s lives, the reduction of atmospheric pollution, and the improvement and improvement of environmental quality. It involves all walks of life and millions of households, and it is related to the people’s livelihood of the country. . The main purpose of the construction of the project is to: adjust the energy structure of Hebei Province, improve the quality of life of urban residents, reduce atmospheric pollution, improve and enhance the quality of the environment.
Second, an overviewThe first phase of natural gas utilization in Hebei Province is a key project in Hebei Province and the No. 1 project of the governor. The engineering design annual gas transmission capacity is 15×108m3 years. Starting from the valve room of the Second Station Village of the Shaanxi-Beijing Gas Transmission Pipeline, the terminal is the Shijiazhuang Last Station. Along the line, it passes through 15 counties, cities, and districts, with a total length of 201.7km. The main pipe diameter φ508, design pressure 6.3MPa. Along the line, there are altogether 4 process stations and 7 interception valve rooms.
The centralized control and data acquisition system (SCADA system) is used for automatic control. The dispatching control center is located at the last station of Shijiazhuang. The dispatching center conducts data collection, monitoring and control of the production operations at each station along the railway line. Each station has a PLC station control system. Reasonable technological level, high-accuracy hand-over measurement, pressure adjustment technology and advanced self-control level have enabled this project to reach the world's advanced level at the end of the 1990s.
III. Introduction to Gas Transmission Station TechnologyA total of four technology stations and stations are located along this line: the first station in Zhangzhou, Baoding station, Dingzhou station and Shijiazhuang station. Each station is designed to take into account the situation of a relatively small amount of gas in the initial period of production, and has a reverse transmission process. When conditions permit, natural gas flows from Shijiazhuang to Luzhou and supplies gas to cities along the route.
The first station of the Chuzhou station is divided into two parts, some of which include natural gas station truncation and emptying, natural gas separation, and natural gas metering (upstream). This part is managed by the Beijing Gathering and Transportation Company; the other part includes the total gas metering (downstream) and the distribution to Quzhou City. Part of the pressure adjustment, measurement and so on. There is also gas online analysis at the first station in Zhangzhou.
The Baoding substation mainly includes two sets of pigging and receiving devices, separation of gas inbounds, and pressure regulation and measurement of the sub-transmissions to Baoding City. The Dingzhou substation mainly includes the cut-off and emptying of natural gas, and the separation and pressure-regulating measurement of the Dingzhou subdivision.
The tasks of the Shijiazhuang terminal station's gas supply to Shijiazhuang city mainly include the separation of natural gas and pressure regulation, and the reserve of the second gas source is reserved, and the interface is reserved for the gas supply in Xingtai and Handan; meanwhile, a dispatch and control center is also provided. , to control and dispatch all production operations. At Shijiazhuang Terminal Station, there are a comprehensive building and a dormitory building, which are responsible for the company staff's dining and some of the staff's accommodation during the initial stage of production.
4.1 Overview The automatic control design of this project includes the first station of Zhangzhou, Baoding substation, Dingzhou substation, Shijiazhuang terminal station control system and Shijiazhuang Dispatching Control Center.
The station control system at Zhangzhou First Station, Baoding Substation, Dingzhou Substation, and Shijiazhuang Terminal Station is responsible for collecting process parameters and operating status of the station, such as temperature, pressure, flow, and power supply and distribution system parameters. The opening, closing, and fault conditions, fire alarms, combustible gas detection, etc. are monitored. The Shijiazhuang Dispatching and Control Center is the management center and dispatching core of the pipeline and is responsible for implementing unified dispatch management for the operation of the first Zhangzhou Station, the Baoding Substation, the Dingzhou Distributing Station, and the Shijiazhuang Terminal Station along the pipeline, monitoring the important operating parameters of the station yard. And status, setting values ​​and various operation commands can be accurately reached from the dispatch center to the relevant station. The station control system and dispatch center form the SCADA system.
4.2 The self-controlled level dispatching control center, the station and control systems in the middle stations and field instruments form a three-level monitoring and control management system model.
First level: Monitoring for local meters, manual and station systems (station meters).
Second level: Realize the centralized monitoring and control (station control system) in the on-duty control system of the station control system.
The third level: Shijiazhuang set up the dispatching control center to focus on remote monitoring and control (SCADA system for monitoring and data acquisition system).
4.3 Control Plan The design and selection of the instrumentation and automation system in this project is based on the principle of advanced technology, economy and practicality. The automatic control system adopts a monitoring and data acquisition system (SCADA system). At the end of Shijiazhuang, a dispatch and control center is set up. The first station, the last station, and each station are equipped with a station control system to monitor the entire station. After careful inspection and comparison, Rockwell Automation ControlLogix PLCs were used to form a centralized monitoring and decentralized control solution. The ControlLogix family of PLCs is Rockwell Automation's newest, more powerful programmable logic controller. It has the following features:
Modularity: The modular I/O, memory, and communication interfaces of the ControlLogix system provide users with a system that is both configurable and easily scalable. Users can flexibly configure the required number of I/Os, memory capacity, and communication network as needed. Later, when users need to further expand the system, they can add I/O, memory, and communication interfaces at any time. The maximum number of I/O points is 128,000. Hot plugging: ControlLogix allows users to hot plug any module in the system without damaging the module. In this way, the user can replace the faulty module while continuing to maintain the system operation. High resolution I/O: Up to 16 bits, optional with self-diagnostic function module, I/O fault report. High-speed transmission: The PRODUCER/CONSUMER technology used by ControlLogix enables data to be efficiently transferred between networks, between links in the network, and between modules in the backplane. High-strength industrial hardware platform: ControlLogix uses a specially designed high-strength industrial hardware platform that can withstand vibration, high temperature, and electrical interference in various industrial environments. Distributed processing: Connect processors through Ethernet, ControlNet, and DeviceNet networks for distributed processing. IEC-1131-complaint operating system: The operating system provides a truly multitasking environment with priority, allowing users to meet their application requirements by individually scheduling software components. This greatly increases the efficiency of the processor and reduces the cost, because it can reduce the number of processors of the user's entire control system.4.4 System Composition and Features The redundant ControlLogix station control system in this system consists of the following components:
Two four-slot chassis: 1756-A4; Two processor modules: 1756-L55M13; Two ControlNet modules: 1756-CNB/D; Two redundant modules: 1757-SRM; Redundant module connecting cables: 1757-SRC1 Two I/O frameworks: including ControlNet module, ENET module, serial communication module 1756-MVI, and corresponding I/O module. Used to connect ultrasonic flow meters, turbine flow meters, electric ball valves and other field instrumentation equipment. The main signal includes 4~20mADC, switch signal, RS485 interface signal and so on.The main features of this redundant system are:
High reliability of the control system; No need for user programming; Guaranteed undisturbed switching of the output under logic control of the highest priority task; Switching only 100ms; Support Logix5555 processor and CNB (D series and above) modules; It is completely transparent to other devices connected to the redundant frame through various networks; the program loading process from the master controller to the slave controller is completely transparent; the settings/commands/editing performed on the master controller online are automatically passed to the slave controller. The user can "cancel" or "restore" the switch. The ControlLogix redundant system is connected to the I/O framework with ControlNet and is connected to the host computer and the dispatch center via Ethernet.4.5 system function station control system main functions:
Data acquisition, data processing, station and field equipment control, remote control of field equipment, normal shutdown of station and emergency stop control, data communication of each system, clock synchronization of each system, operator authority control, confirmation of operator's identity, behavior record, alarm Management: Display all existing alarms and all alarm conditions that have not been confirmed under normal conditions, display the alarm time; Trend curve management: including real-time and historical trend curves; Monitor control screen: Accurate image display of on-site process flow, support quick Key operation; Report generation: print production reports, historical reports, etc. at regular intervals.The supervisory control software uses Citect, an open integrated development software for industrial applications. The main communication means of the SCADA system is DDN, and PSTN is used as a backup channel. The computer hardware system of the dispatching control center consists of servers, operator workstations, engineer workstations, manager terminals, alarms, and report printers. In order to improve the reliability of the system, the server and the local area network (LAN) adopt redundant configurations. The operator workstations, engineer workstations, etc. all serve as one node on the local area network and share the resources of the servers. This design is not only technically advanced, simple in operation, but also highly reliable after industrial production tests. The software configuration is modularized to facilitate revisions and upgrades.
The dispatch control center has the following features:
The entire process flow screen display; Data collection, display and storage of historical data in real time; Real-time data and historical data search and review; Flow calculation data table display; Flow analysis and calculation; Trade settlement management; Production report generation and printing (daily, weekly, Monthly report, etc.); Alarm, event recording and printing, accident alarm forecasting and recall; Accident remote station emergency stop control; System configuration and overview display; Production operation and dispatch management; Communication with the Shaan-Jing Line dispatching center.Description
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