Abstract: In this paper, water and gas plant in Daqing Petrochemical Company chemical sewage incineration plant control system, for example, discusses OMRON PLC applications in the field of wastewater treatment. The system s hardware, software configuration and working principle are described, and highlight a PID loop control in the non-disturbance switch programming.
???Keywords????: OMRON PLC; PID; non-disturbance switch
1, chemical control system for sewage incineration plant
water burning gas plant chemical plant wastewater effluent from each of Daqing Petrochemical Company plant effluent. The device includes two regenerative furnace and incinerator main equipment, temperature control and ignition control stove fire Tsui is the key to complete control system. The original control system was developed by regulators, display instruments, such as lap relay formed, 1 9 84 years to install and put into use. Because prolonged use, and aging equipment, outmoded, big error display instruments, not only to maneuver and difficult to maintain, and there is security risk. 2006 regeneration furnace, burning furnace of two parts of the original into a unified control system PLC control system, produced by Japan OMRON PLC CS1H series products. After the device control system of a car intoPower, through the PLC control system can monitor the entire production process and control.
Second, the control system configuration and description
2.1 Hardware configuration ???? CPU unit: CSIH CPU63H capacity 20K steps program, I / O bits for the 51 20 points, 7 rack scalable data storage capacity 64K word.
???? power supply unit: C200HW-PA209R voltage range: 8 5 1 32V A C or 1 70264VA C. 50/60HZ
???? digital input modules: C200H ID212 The module for the 16-point DC24V input module, the maximum consumption current 7MA.
???? switch output module: C200H OC225 16 points in the module for the output module, the output maximum current 2 A.
????è Analog Input Module: C200H AD003 the module for the 8-channel input module, the input signal is 4 20MA, 1 ~ 5V, 0 10V, a 10 ~ 10V standard analog signal, single passRoad isolation, 1 / 4000 resolution, acquisition and processing speed 2.5MS/MAx / point.
???? analog output module: C2 () () H DA004 output of the module is 8, output 4-20MA standard analog signal. 1 / 4000 resolution, conversion speed 2.5MS/MAX / point, single-channel isolation.
???? thermocouple unit: CS1W ~ PTS51 the module for the 4-way temperature sensor unit, which can be accessed S-type, K type or J-type thermocouple.
????ì communication module: CS1W CLK21 ~ V1 in the module CONTROLLER LINK Industrial Ethernet module, communication rate of up to 2MB / S, shielded twisted pair communication medium, the maximum transmission distance of 1 km
????§ communication card: 3G8F7 CLK21-EV1
the communication card installed in the IPC P CI slot, and CS1 W ~ CLK21_V1 Link to use.
2.2 Software Description
???? CX-PROGRAMER 6.0 of the software for the PLC program-specific software, powerful, and available online to monitor and modify the program.
???? operating station configuration software: RSVIEW 32 The software for the A B configuration software produced by the company for the development and operation of an integrated version, can link to point 1 0 K , reliable and powerful. 2.3 Overall control requirements and functional chemical sewage incineration plant automatic control system requirements for the sewage sludge incineration process of regeneration and to control and automatic regulation, so that the treated discharge water quality indicators to the extent required. Functions as follows:
???? Control: In the control room of the accused sewage treatment equipment online real-time control.
???? Display Function: Graphics showing the scene in real time charged with the equipment operating conditions, and the site of state parameters.
???? Data management: changes according to different operating parameters and the importance of speed, the establishment of production history database, stored produce raw data for statistical analysis of the use; use of real-time database and historical data in the database for comparison and analysis, draw some useful experience parameters, help to optimize control, and to some of the necessary parameters and results to the screen in real time to.
???? alarm: When an analog (such as flow, temperature, etc.) to measureValue over a given range or a switching capacity (such as pressure switches, flame Jiance etc.) Fasheng change ???, by virtue of the different needs of different levels of ???¨¨?? Fachu, while also providing Jinxing diagnose the warning on the PLC.
2.4 PLC program structure and implementation
according to process characteristics, PLC programming in the form of the use of sub-programming, so to make the program readable, easy to understand. Incinerator control procedures in order to, for example, control procedures, including analog processing, the time parameter settings, loop control, fire Tsui ignition procedures, alarm program, address translation procedures, controls clear thinking, the program readable. Only in PC operators on the issue simple commands to control program can process requests in accordance with the steps of the field devices to control. PID loop control instruction on the use and application process is difficult PLC, following a single-loop control, for example, shows PID instruction manual / automatic switching of programming without disturbance. Non-disturbance switch description of the procedures: HlOO. OO is a manual / automatic switch places, when H100.00 = l, the manual control; Hl 00.00-0, the automatic control. Differential switching instruction, said the falling edge of the moment.
???? Manual 1 Automatic: Switch the moment (do once), to manually enter the operating variable output (D330 ) directly assigned to control valve output (Q2062); control process,PID control operation by the variable command output.
???? automatic a manual: Switch the moment (do once), the control valve of the output value (Q2O62) directly assigned to manually enter the control threshold (D 3 3 0); manual operation, according to manually input operation with variable valve control output.
3 Conclusion
this control system with stable, reliable, and greatly improved labor productivity. The system has effectively solved many production problems, such as the production process to reduce unexpected failures, reducing the production lead time and repair time, reduced labor intensity, creating significant economic and social benefits, to the energy conservation, energy purposes. -->