OYES- The 200 series PLC application in the electric control system

A, low voltage control system of electrostatic precipitators and control requirement of electrostatic precipitators low pressure control technology mainly includes the vibration control, insulator thermostat electric heating control ash hopper electric heating control, discharge control, material level control, import and export temperature display, high voltage isolating switch in position display and remote communication, etc. 1. 1 vibrating electrode vibration control system for dust is the main working process of the electric dust catcher, not only with its effect on the Yin and Yang in the vibrating acceleration, and the vibration cycle of the impact is very big also. Traditional way of shaking for tangential vibration, the control can be divided into continuous shaking and vibration play regularly. In vibration strength and uniformity are all meet the requirements, vibrating system is reasonable, a strong impact on the electrostatic precipitator dust removal efficiency. Vibrating frequency, the dust collected on the anode plate can't into pieces fall into ash hopper, serious secondary dust, especially secondary level electric field at the end of the float in the sky, will greatly reduce the efficiency of dust collection. On the other hand, the long cycle of oscillation, the anode of dust accumulation is too thick, can make the Yin and Yang between voltage is reduced, the secondary current is reduced, the corona power decreases, and dust removal efficiency decreased; Anode severe dust even reverse corona formation, has been collected on the anode plate of dust into the air again. So, choose the reasonable vibration cycle, will help better clear ash and improve the effect of dust removal. 1. 2 the dust discharging into the electric control system is extremely Yin and Yang after capture, by vibrating system vibration on ash hopper, these ashes raw materials should be timely send out, gray material accumulation is too much, each other the increasing load of ash hopper, serious when still can cause a short circuit between Yin and Yang, the normal operation of the electric dust catcher, on the contrary, ash hopper no ash storage, air leakage occurs in the ash hopper outlet, cause secondary dust, reduce dust removal efficiency. 1. 3 extremely hot object control system of heating control system including girder electric heater, Yin porcelain axis electric heater, hopper, electric heater, etc. Commonly used control strategy is based on the temperature of the temperature measuring device signals of electric heater temperature control. When the temperature under the hell, start the electric heater heating; Temperature is higher than the limit, stop electric heater heating. Second, the application of electrostatic precipitator low voltage control system of shandong low voltage control system in using plant dust chamber adopts three electric dust removal method, electrostatic precipitators three electric field has six vibrating motor, three ash hopper heating controller, 3 girder heating controller, three discharging machine, plus the alarm signal output, hot air motor control, total startup, failure to lift, three electric field test input, the indicator girder temperature, control the ash hopper, etc, etc. , is a total of 20 points 23 point digital input, digital output, analog input at 8, 6 tc temperature measuring inputs. According to the above calculation, low voltage control system with our CPU - electrostatic precipitators 224 a as main control part. PLC controller module layout as shown in figure below including CPU224A module fault signal of motor drive protection, electrical heating protect the fault signal of the controller, the temperature of the temperature acquisition processor signal, material level signal and lose discharging equipment of electrical signals, after analysis and processing, according to the technological process to control the vibration motors, heaters, alarm and a control signal to the corresponding external devices. Digital quantity input/output module EM223 unloaded ash motor CPU module control signal to the corresponding external devices. Analog input modular EM231 related signals of the high voltage silicon rectifier equipment and temperature acquisition and brought in the import and export of flue gas temperature, the place such as girder, ceramic shaft, ash hopper temperature signal to CPU module analysis and processing. Three, the electric precipitator low voltage control system software design 3. 1 vibration control design based on many years of experience in operation of electrostatic precipitator low voltage control system, in order to improve the efficiency of electrostatic precipitators, effectively reduce the power consumption, the optimization of local oscillation motor control for the following requirements: the same electric field in the cathode and anode shaking cannot simultaneously; In the electric dust catcher, anodic electric field (before and after Or cathode) Shaking cannot simultaneously; Set a vibrating trough plate electrostatic precipitators, the electric field at the end of the anode shaking and trough plate vibration cannot simultaneously. 3. 2 heating heater controlled by constant temperature range, that is, to set the temperature of the upper and lower amplitude interval to control the start-stop of heater for work. When measuring temperature below the set temperature below the set temperature deviation, heater starts to work, when heated to a temperature measurement deviation at temperature higher than the set temperature, the heater stops working, until the lower deviation of measured temperature below the set temperature heating heater starts again, cycle, complete temperature control. 3. 3 discharge control design of electrostatic precipitators discharging mode can be divided into the timing automatic discharging, upper and lower level automatic discharging and loading a timing automatic discharge. In this system USES a 'high level + sequence control method, namely high level timing discharging, combine cycle discharge way. High level discharge refers to the so-called when low voltage control system detected on a material level signal when start the corresponding discharging device; When the work after a certain period of time, delay for a period of time again to stop corresponding ash interlocking system. To avoid damage to the indicator or misstatement caused by electric field wall ash, and add timing cycle discharge function, to ensure that the system can automatically discharging.
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