The realization method and difficulty of centralized control of the 162th air compressor station of Jinqiang Power Li Yajun, Chen Delei (Shougang Jingtang Company, the Ministry of Energy, Hebei Tangshan 06320 (French and major difficulties).
1 Centralized Control System Overview Shougang Jingtang Company has 4 existing air compressor stations in the ring department, 16 air compressors in 250m3/min, and 5 air compressors in 400m3/min. It is responsible for the supply of compressed air to the plant. In order to achieve the purpose of centralized management and centralized monitoring, the data of the iron-making air compressor station, the milk steel air compressor station, the steel-making air compressor station and the sintering air compressor station are collected to the new main control of the steel-making air compressor station. The room is centrally controlled.
2 The realization of centralized control After the author's research, I believe that the implementation of centralized control has the following methods, which are now stated.
2.1 PLC-based centralized control system The traditional centralized control method is to set up a centralized control PLC system, and the collected data of each station is connected to the centralized control PLC through hard wires, and the data of each station is read by centralized control PLC. However, taking the rolling station as an example, it is about 3 kilometers away from the steel-making station. If the collected signals are connected by hard wires, the construction amount is large and the cost is large. The air compressor body and the dryer body communicate via Ethernet, because the distance is long. The data communication is unstable.
2.2 Centralized control system based on independent optical fiber This method is to lay the optical fiber from the stations of iron making, milk steel and sintering to the steelmaking air compressor station, and read the data of Siemens 400 series PLC of each station. This method is based on PLC. Compared with the centralized control system method, the data acquisition reliability is high and the data communication is stable, but there are still defects of large construction volume.
2.3 The centralized control system based on the energy ring network adopts advanced automation and information technology to establish an energy center, and implements centralized monitoring and management of data such as power system, power system tenderness, heat, oxygen and nitrogen*, water supply and drainage system. The whole system collects several field substations and multiple communication interfaces through communication devices such as optical fibers, so that the entire ring-capable stations form a connected ring network. This method reads data from the energy center switch of the steelmaking station and implements centralized control after configuration and configuration. This method is simple to implement and low in cost, so it is the best method for centralized control. Its main network is as shown.
3 Based on the centralized control system of the energy ring network and the main difficulties, the ring air compressor station can realize the partial cooling water system, compressed air system, pump system and air to the air compressor station factory through two sets of Siemens 414 redundant PLC system. Control of the start and stop of the press dryer, self-cleaning device, dosing device, etc. At the same time, the main parameters of the air compressor body and the dryer body are converted into ModbusTCP protocol by the Mgate gateway through the Mgate gateway, and read directly in the upper position. PLC adopts Siemens SteP7v5.4 programming software, and the upper level adopts general ffix4.0 monitoring software. The final principle of centralized control is to add 4 sets of centralized monitoring and monitoring upper computer in the newly built main control room, and retain the upper computer monitored by the original station to realize the monitoring of the data of the same station by the two upper computers. In order to ensure the reliable connection of the data, the IP address of the air compressor and the dryer in each station is 192.168.5. Therefore, the IP address of the reserved electrical interface of the site energy network cabinet switch is configured as 192.168.5. The IP address of the Siemens 400 series PLC of the factory is configured as 192.168.5. The monitoring of the data of the same station by the two upper computers mainly has the following two implementation methods.
3.1 By means of SI7 driver by means of establishing an OPC station The data acquisition system realized by SI7 driver, first add a SIMATICPCStation in the engineering station Step7 to ensure that two upper computers in the hardware establish communication with a PLC. After SIMATICPCStation, download SIMATICPCStatkm to the centralized PC. If the connection between the 0PCServer and the CPU is established in the configurenetwork, the network configuration is downloaded to the PLC. It should be noted that this download will cause the PLC to stop, and the trip caused by some running devices should be avoided.
Step7 network communication connection configuration in the Ifix4.0 to increase the MBE drive to achieve data communication between the dryer and air compressor body data. Add SF7 driver in Ifix4.0, as shown in the system network diagram SI7 driver channel configuration, select S7connection in the device name, 1 connection.
SI7 driver connection configuration centralized control sintering monitoring host computer control steel control monitoring host computer set control steel monitoring host computer control iron control monitoring host computer energy network cabinet switch iron and steel air compressor station switch factory part Siemens 400PLC dryer gateway Air compressor gateway factory part Siemens 400PLC dryer gateway air compressor gateway factory part Siemens 400PLC dryer gateway air compressor gateway factory part Siemens 400PLC dryer gateway air compressor gateway metallurgical power new master control room switch finally passed SI7 adds DB blocks to map data in the PLC.
3.2 Implementation of the S7A driver The data acquisition system implemented by the S7A driver is relatively simple to use. After installing the S7A driver, by adding DB blocks in S7A to map the data in the PLC, there is no need to configure SIMATICPCStation in the engineering station SteP7. The two upper computers can be configured with different IP addresses.
The PLC outputs the DO point and directly supplies the buzzer to the DC24V power supply. After the centralized control, create a new schedule in the Ifk software schedule, write a program, and let the alarm point be called. The audio file in WAV format is fine.
In the centralized control work, we have improved the previous monitoring system to overcome the difficulties and realize the automatic generation of the temple function for the upper computer operator records and reports.
3.3 Implementation of Operation Record In this centralized control work, the operator record is added to the upper station of the sintering station, which is mainly convenient for finding faults in the future. The operator record preparation needs to configure the data source (ODBC) in the computer management tool, add the Microsoft Access Driver driver in the system DSN, define the data source name such as Alarm, and create the Access database in the APP directory of the Ifix in the specified directory.
In the Ifix system configuration, enable the alarm ODBC service, configure the ODBC alarm service, the database type is Access database, select the database identifier Alarm, and configure the column for the database.
In the picture, add two OLE object controls as the time start and end selection items, select the Visi*mX data control as the filter condition for the operation record, and select the ViskcmX grid control as the display interface of the operation record. The display of the operator record can be implemented after the relevant configuration.
3.4 Report automatic printing generation Automatic report printing is another breakthrough in this centralized control work. The idea of ​​automatic report printing is to generate an Excel document from 8:00 to 15:00, taking 3 classes per day, 16: An Excel document is generated from 00-23:00, an Excel document is generated from 0:00-7:00, data is collected once every time point, and all the data to be recorded on the site is automatically generated. It should be pointed out that it is necessary to create a new schedule in the schedule, write the corresponding VB program, and call the address of the data collection point. Also set this schedule to background startup in the user preferences.
In addition, in the ffix system configuration, Workspace and Fix 4 collective control work results were added. The air compressor station centralized control work was the key renovation project of Shougang Jingtang Company's energy ring department in 2011. The initial budget was more than 300,000 yuan. Under the premise of the transformation cost, only some spare parts were used, and the centralized control work was completed satisfactorily, which saved the company cost. After centralized control, data collection is stable, providing a strong guarantee for production monitoring, and at the same time, it is possible to reduce labor costs.
The University of Architecture and Technology, an electric drag and automatic control assistant engineer, is currently working in automation.
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