PLC in angang coke oven gas tank and the application of automatic control system

One is modern coke oven because of the furnace capacity increasing, a by-product of smelting intensity increasing, creating a large number of - Coke oven gas. If the coke oven gas radiation directly into the air, not only can cause the pollution of the atmosphere, also can cause the waste of energy. In view of this, anshan iron and steel gas factory new capacity is 150000 M3 ark of coke oven gas, used to store the coke oven gas. Coke oven gas cabinets automation equipment and automatic control performance of the control system is good or bad, will directly affect the collection and utilization of coke oven gas. This project USES is famous for its high reliability products rockwell automation is a new generation of control platform ControlLogix series PLC redundancy system. In the ControlLogix system, all the maintenance and communication is done by the system automatically, more convenient, reliable, and the user can write state reading program to monitor the status of the redundant system. 2 system hardware configuration of angang 150000 M3 of coke oven gas tank automatic control system of PLC controller selection ControlLogix L5550 redundant systems. Considering the factors such as distance, more nodes, anti-interference, using ControlNet network type, good anti-jamming, network channel redundancy, ensure reliable communication and man-machine interface, according to data but also to live of the fast data acquisition. The system hardware configuration is shown in figure 1. Figure 1 system hardware configuration of the CPU to choose 1756 - L62 module, communication module is chosen 1756 - 1756 - CNBR, DI is chosen IB16I, DO choose - 1756 1756 - OB16I, AI is chosen IF16I。 Use 1756 - Ethernet module ENBT。 Redundant rack in addition to the CPU module and communication module - 1756 1756 - CNBR, hot standby module SRM（ Keep the Lord, from the communication between frame) And two connecting cable 1756 - between the hot standby module SRC3。 Server, system operation station platform for Windows ( Server/client) , operation site monitoring software for RSView 32, PLC programming for RSLogix5000 configuration software. Also has a set of database management system, the use of network configuration software RSLinx OPC interface provided by the collected data. 3 automation control system of gas tank, pump station automatic control system including the gas tank ontology group import and export pipe, heat exchange unit, gas, electric butterfly valve, and emergency relief pipe valve control. 3. 1 pump station management for any oil pump station two oil pump start times and operation time ( Hours, minutes, seconds) Separately the total respectively, and get the combined station to start the total number and total running time, in the main picture on display drainage pumping stations for operation and management, it also has a reset button, press the number and time back to zero after restart statistics. 3. 2 the import and export and tossing valves hand/automatic control valve in the import and export radiation control is divided into two field manual and PLC. These two kinds of control mode is conducted on site operation box. The scene manually by site operation box on the action button to operate equipment. PLC can be automatically by manipulating the screen to operate equipment. On operating import and export valve/tossing in valve, must confirm the following basic operating conditions: site operation box select + PLC automatic way valve on the main switch valve closing + trouble-free. Three conditions to achieve at the same time, known as the basic operating conditions. Import and export import and export pipeline valve installed in the gas tank, tossing in valve installed on the gas tank tossing in the pipe. Can hand through pop-up window/automatic switch, operation can be divided into two ways: ( 1) In manual mode, press the manual valve open button, after the signal open import and export valve/tossing in valve, the valve when the button is closed signal, manual start without any external chain relationship. （ 2) In the automatic state, satisfy basic operating conditions, when the piston reaches the upper limit on ( 69. 3米) 95% of the volume, or under the piston to the lower limit, 7. 3米) 10% volume, the signal import and export valve closed, to open the valve, can only be opened by manual operation; When the piston reaches 69. 3 m or 95% volume, then the signal open tossing in valve; If the piston back to 65. 6532 m or 90% volume, the signal radiation valve shut. 3. 3 upper monitoring system of the composition of this system is divided into seven pictures, including the gas tank monitoring main scenes ', 'heat exchange unit monitor screen', 'monitor main scenes', 'equipment monitor screen', 'historical trend', 'alarm screen', 'print screen'. All pictures are free to switch. 3. 3. 1 animation display in the picture, the system operated in each part have animation display function. For example: when the valve is closed state of valve body displayed as red, when the valve is open state of valve body display for the green; Selected work after pump and standby pump, will appear under the pump of the corresponding words, when the pump work small lights turned green, stops is red; Limit point comes, lights will be in the corresponding position; Counters at upper or down limit, fill inside ark will turn red, when reach the upper or lower limit, fill inside ark will become yellow, normal for the green. 3. 3. 2 comprehensive important alarm alarm function for gas tank system, and on each picture all has showed: change the color, sound alarm and alarm status records. Another alarm company picture, can view the alarm and event information from the images. 3. 3. Three historical trend logging system for oil tank oil temperature, flow parameters and pressure parameters, temperature, import and export pressure, pressure can be up to one day, a week or a month of record history curve.
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