Embedded PLC on pulse combustion mode the application of the shuttle kiln control system

Embedded PLC in the control system of the pulse combustion mode shuttle kiln application xiao-lin huang welcome to e exhibition hall 5 roasting/calcination/sintering furnace sintering machine, sintering furnace, carbide furnace, furnace tubes, bearing plate burning,. 。 。 Abstract: the article introduces the embedded PLC as the main controller and the man-machine interface of shuttle kiln temperature control scheme, and the scheme, which is mainly composed of pulse combustion mode with the traditional control scheme are compared. 1 introduction the traditional way of pulse combustion shuttle kiln temperature control system with single loop PID adjusting apparatus with Germany Krom MPT - for the company 700 p pulse controller to solve, but that the controller has at most two road input, and the price is extremely expensive. If a large volume of shuttle kiln is controlled by a pulse controller, such as a temperature uneven phenomenon, the system cannot automatically suppressed, can only manual intervention. In this paper, the case, the use of the power company Easy series PLC controller and HITECH man-machine interface solution of the company. 1. Application places: 1 March, 2005, our company won the bid of Renault contract to build the tangshan ceramics co. , LTD. 100 cubic pulse combustion mode shuttle kiln project. The project has been completed and put into production in June, the equipment has been normal operation. 2 2 request. 1 basic electrical parameters and requirements, exhaust fan power 37 kw2, combustion fan 18. 24 sets of 5 kw3, whole kiln burner, eight temperature control zone temperature automatic control 4, furnace pressure, according to the same curve combustion-supporting wind pressure hand 5 / automatic control, the PID adjustment, pulse combustion, flame detection 6, 7, flame-out protection adopts automatic chain machine in and out of the kiln car 8, alarm, equipment safety chain 3, 3, 1 system plan system structure Easy - 1, 4, Taiwan M0808R - Easy - A0404NB hybrid PLC and 1 M2416R on-off PLC, through CAN bus of master-slave station network, complete equipment start-stop, temperature, pressure control and process control. 2, machine through RS232 interface connected to the main PLC RS0 mouth, all working condition of manual operation, parameter setting, display through the man-machine interface implementation. 3, configuration in the factory as a server, a computer through the RS232 connected to the main PLC RS1 mouth, monitoring of kiln running status and record operating data. Other authorized Internet users can also access the server through easily examined the kiln operation or consult the kiln historical data. 4, the system block diagram 3. 2 system features 1, 8 temperature control zone assigned to an average of three sets of PLC control, district of thermocouple signal input and output compared with the pulse valve arranged on the same PLC, and the relevant control parameters is through in the PLC man-machine interface preset. This kind of treatment of benefit is: 1) And make temperature control action in the shortest possible time to get response; 2) Exchange capacity, reduced the CAN communication data, to speed up the communication; 3) , easy to fault diagnosis. 2, pressure control, chain motor sequence control is performed by separate PLC respectively. 3, in default of man-machine interface in the three firing curve, select one of them as the current working curve, at the same time provide eight temperature control zone as a dynamic set temperature. And every temperature zone are independent PID regulation. 4, in the PLC program control of the PID direction, easily realized automatic conversion furnace heating mode to cooling mode. 3. 3 man-machine interface function 1, 2, system temperature, pressure equipment start-stop system set 3, the PID parameters set 4, 5, chain machine control pulse parameter setting parameter set 6, kiln current running status display 7, system history data record 8, 3 system alarm function. 3 man-machine interface picture 4 comparative analysis we ever constructed by tangshan ceramics in 80 m3 pulse combustion type shuttle kiln used in PID control instrument and MPT 700 p pulse controller as the master control component of control system, the following is a PLC/HMI control system with pulse controller the comparative analysis of the control system: 1, convenience: PLC control system circuit design is concise, a large number of instruments, button, relay is simplified. Complicated circuit is the configuration of the PLC program and HMI. 2, consistency: through PLC powerful functions of temperature control more model replaced the temperature range of single pulse controller control mode. We in tangshan ceramics of shuttle kiln kiln car left right up and down are placed WenHuan measuring, testing furnace temperature districts. WenHuan after testing all measured from the kiln, the difference between the maximum temperature and minimum temperature of 14 ℃. We in Renault's PLC control for the same test in shuttle kiln, via detecting all WenHuan measurement, the difference between the maximum temperature and minimum temperature is 8 ℃. 3, accuracy: under normal operation, the control points of PLC control system of the real-time temperature tracking - the tolerances of the set temperature 2 ℃ to + 3 ℃, the tolerances of the pulse controller system for + / - 1 ℃. To be further perfect, it shows that the PID parameters of the PLC program algorithm needs to be further optimized. 4, flexibility: because of the PLC program and HMI configuration can be modified at any time according to the actual operation situation and the requirements of users, so PLC system has better flexibility. 5, connectivity: PLC control system, through a cable can be convenient to all kiln running state and reportedly sent to the computer, and access to the Internet; Pulse need to configure the control system of all kinds of communication module to the system information in the computer. 6, economy: PLC controller + HMI + PC: 25000 yuan, can control the temperature range of eight; MPT - 700 p pulse controller + regulator, digital display table, communication module and industrial PC: 54000 yuan, can only control temperature range of 1. Hybrid PLC system has better performance.
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