(1) Adjust the electrode voltage according to the given frequency of spark discharge: the electric field voltage has a certain relationship with the spark discharge. When the field pressure is low, there is no spark; when a certain value is reached, the spark discharge occurs; continue to increase the voltage, and the spark discharge frequency increases until the breakdown is reached. The frequency of spark discharge per unit time has a certain relationship with the dust removal efficiency of the electric field. From the relationship between the spark discharge frequency and the dust removal efficiency, the effect of the dust removal number is favorable in the range of the spark discharge frequency of 40 to 70 times/min. The frequency will increase due to the energy consumption of the spark breakdown, and the efficiency of the precipitator will decrease. With this favorable spark discharge frequency as the information to control the electrode voltage, the operating voltage curve is closer to the breakdown voltage curve.
Wet electrostatic precipitator thyristor automatic control high-voltage silicon rectification device is a kind of high-voltage power supply commonly used recently. The main feature of this control mode is to use the high-voltage flashover signal of the electric field as a feedback command. The detection link flash signal is taken out and sent. Go to the voltage regulation white control system of the rectifier. After the feedback command is obtained by the automatic control system, the voltage drop of the main circuit voltage regulation can be flashed and blocked, and the time interval of each flashover (ie, the spark rate) is controlled. Make the equipment work at a good spark rate as much as possible to get a good dust removal effect.
There are also inadequacies in the way of adjusting the electrode voltage according to the spark discharge frequency: the system works according to the fixed frequency of a given spark discharge, and as the airflow parameters change, the breakdown strength between the electrodes changes, and the spark discharge frequency also needs to be Changes occur, the system does not respond to these; if the spark discharge frequency is not high, and the discharge current is large, it is easy to produce arc discharge, that is, this is still "unstable state."
(2) The method of adjusting the maximum value of the large average voltage on the electrode. As the initial voltage of the transformer rises, the average value of the voltage on the electric board first has a linear relationship of seven liters. After reaching a large value, it begins to fall. The reason is that the spark discharge intensity rises. The large average voltage on the electrode corresponds to the good frequency of the spark discharge between the electrodes of the precipitator, so maintaining the average level of the average voltage on the electrode corresponds to keeping the operating condition of the electrostatic precipitator below the frequency of the spark discharge. The good frequency varies with the variation of the airflow parameters within a wide range, which solves the "unstable state" that is simply adjusted by the number of times the spark is given. Under this extreme voltage regulation system, the adjustment pattern is The graphs shown are similar, and the operating voltage curve is closer to the breakdown voltage curve.
In short, in any case, the adjustment of the operating voltage and the output current of the unit is performed by the action of the control signal on the main body regulator (or the main control element), which is an automatic transformer, an inductive regulator, Magnetic amplifiers, etc., are now commonly found in silicon thyristors (SCRs).