JPH06328007A - Automatic hammering control method of electric dust collector - Google Patents

Abstract

PURPOSE:To stably operate an electric dust collector by stably generating spark discharge and preventing the decrease of dust collecting efficiency. CONSTITUTION:A hammering control apparatus 18 drives and controls a hammering apparatus 36 based on applied voltage signals from a thyrister controlling apparatus 20, that is, applied voltage signals at the time spark discharge detected by a voltage detector 30 is generated. Driving applied voltage V0 at normal time slightly decreases at the time of following hammering due to the fact that powder dust adhering to dust collecting electrodes 16 is gradually accumulated. In the case average applied voltage is detected to be V1 or lower when spark generation occurs frequently and spark discharge occurs, the hammering apparatus 36 is controlled to intervene and work for T2 time during pausing time T1 of the hammering apparatus 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically controlling the hammering of an electrostatic precipitator, and more particularly to a method for automatically controlling the hammering of an electrostatic precipitator in which an applied voltage is controlled by a thyristor so that a spark discharge occurs at a predetermined cycle. Regarding control method.

[0002]

2. Description of the Related Art Generally, an electrostatic precipitator has a discharge electrode, a dust collecting electrode,
And a DC high-voltage power supply device, which gives a charge to the dust in the gas introduced into the electrostatic precipitator by the DC high voltage applied to the discharge electrode from this DC high-voltage power supply device, and charges the charged dust by Coulomb force. Dust is removed from the gas by attaching it to the dust collecting electrode.

The DC high voltage is applied to the discharge electrode by controlling the voltage by a thyristor incorporated in the DC high voltage power supply device, and this DC high voltage (applied voltage) is The current and the applied voltage are respectively detected by the current detector, the current detector, and the voltage detector. The detected current and applied voltage are output as a feedback control signal to the control device of the thyristor, and
The thyristor control device controls the thyristor so that the electrostatic precipitator operates at the highest voltage in a state where spark discharge continuously occurs to some extent based on the current and the applied voltage, that is, at a high dust collection rate. .

On the other hand, the electric dust collector is provided with a hammering device. This hammering device is drive-controlled so as to hammer the dust collecting electrode at a predetermined cycle, and removes the dust adhering to the dust collecting electrode by peeling to prevent the dust collecting rate from decreasing.

[0005]

However, in the conventional electrostatic precipitator, the applied voltage for generating the spark discharge decreases as the amount of adhered dust increases, so that the dust collection rate decreases. The present invention has been made in view of the above circumstances, and an object thereof is to provide an automatic hammering control method for an electrostatic precipitator that prevents a decrease in the dust collecting rate and stably operates the electrostatic precipitator. And

[0006]

In order to achieve the above object, the present invention detects a voltage applied to a discharge electrode of an electrostatic precipitator and a discharge current, and a spark discharge based on the applied voltage and the discharge current. An electrostatic precipitator equipped with a DC high-voltage power supply device that controls the applied voltage so that is continuously generated, and the dust collecting electrode of the electrostatic precipitator is hammered at a predetermined cycle to adhere to the dust collecting electrode. With a hammering device for peeling and removing the dust, the hammering operation of the hammering device is interrupted in the predetermined cycle when the applied voltage when the spark discharge occurs becomes a predetermined voltage or less. The feature is that it is controlled to do.

[0007]

According to the present invention, when the applied voltage at the time of spark discharge becomes equal to or lower than a predetermined voltage, the hammering operation of the hammering device is interrupted in a normal hammering cycle, Dust that adheres to the dust collecting electrode is removed. As a result, it is possible to prevent a decrease in the applied voltage that causes spark discharge, so that the electrostatic precipitator can be operated stably.

Further, when the applied voltage becomes equal to or lower than a predetermined voltage, the application of the applied voltage may be stopped and the hammering operation of the hammering device may be performed. This is advantageous because it is possible to prevent a drastic decrease in the dust collection rate when the applied voltage sharply drops, that is, when a large amount of dust suddenly adheres to the dust collecting electrode.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the automatic hammering control method for an electrostatic precipitator according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of an electrostatic precipitator 10 to which the automatic hammering control method for an electrostatic precipitator according to the present invention is applied.

As shown in FIG. 1, the electrostatic precipitator 10 includes a DC high-voltage power supply device 12, discharge electrodes 14, 14, ...
And a hammer control device 18. Electric dust collector 10
AC power supply AC for operating the DC high-voltage power supply device 12
After being converted into a DC high voltage by a thyristor 22 whose phase is controlled by a phase control signal from a thyristor control device 20 built in, a voltage applied to the discharge electrodes 14, 14 ... Through a transformer 24 and a rectifier 26. Is applied as.

The applied voltage is detected by the current detector 28 and the voltage detector 30 of the DC high-voltage power supply device 12, and the detected current and voltage are supplied to the thyristor control device 20 as a feedback control signal. Is output. In the thyristor controller 20, the level of the feedback control signal output from the current detector 28 sharply increases, and the level of the feedback control signal output from the voltage detector 30 sharply decreases, The occurrence of spark discharge in the dust collection chamber 32 can be detected, and when the spark discharge occurs, the spark time control function is operated for the purpose of preventing a decrease in the dust collection rate.

When the spark discharge occurs, the spark control function temporarily suspends the gate of the thyristor 22 and restores the applied voltage to a value obtained by dropping ΔV from the original voltage V ₀ as shown in FIG. After that, at the angle (time) of θ, the original voltage V ₀
Tries to recover automatically. On the other hand, the hammer control device 18 drives and controls the motor 34 to operate the hammer device 36, as shown in FIG. When operated, the hammering device 36 hammers the dust collecting electrode 16 to peel off and remove the dust adhering to the dust collecting electrode 16. Further, the hammering device 36 is controlled by the hammering control device 18 to operate for a period of T ₂ at a cycle of T ₁ , as shown in FIG.

Further, the hammering control device 18 drives the hammering device based on the applied voltage signal from the thyristor control device 20, that is, the applied voltage signal when the spark discharge detected by the voltage detector 30 occurs. 36 is driven and controlled. Next, hammering control of the hammering control device 18 based on an applied voltage signal from the thyristor control device 20 will be described with reference to FIGS. 2 and 3.

[0014] When normal operating voltage applied V _0, the operation applied voltage V ₀ is slightly drops at the time of the next discharge by dust dust collection electrode 16 is gradually more adhesion. When the average applied voltage when the spark discharge occurs frequently and the spark discharge is detected is V ₁ or less, the hammering device 36 is interrupt-driven during the pause time T ₁ of the hammering device 36 to drive T ₂
Control to drive for hours.

As a result, the dust adhering to the dust collecting electrode 16 is peeled off and removed, so that the operation applied voltage can be restored to the original voltage V ₀ during the rest time T ₁ of the hammering device 36. Therefore, since the spark discharge is stably generated during the operation of the electrostatic precipitator 10, the electrostatic precipitator 10 can be stably operated. Further, when the applied voltage becomes V ₂ or less shown in FIG. 3 during the rest time T ₁ of the hammering device 36, the application of the applied voltage may be stopped and the hammering operation of the hammering device 36 may be performed. .

This is advantageous because it is possible to prevent a drastic decrease in the dust collection rate when the applied voltage sharply drops, that is, when a large amount of dust suddenly adheres to the dust collecting electrode 16.

[0017]

As described above, according to the automatic hammering control method for an electrostatic precipitator according to the present invention, when the applied voltage when a spark discharge occurs is below a predetermined voltage, the hammering is performed. The hammering operation of the device was controlled so as to interrupt the normal hammering cycle. As a result, it is possible to prevent a decrease in the applied voltage that causes spark discharge, so that the electrostatic precipitator can be operated stably.

Further, when the applied voltage becomes equal to or lower than a predetermined voltage, the application of the applied voltage may be stopped and the hammering operation of the hammering device may be performed. This is advantageous because it is possible to prevent a drastic decrease in the dust collection rate when the applied voltage sharply drops, that is, when a large amount of dust suddenly adheres to the dust collecting electrode.

[Brief description of drawings]

FIG. 1 is a block diagram of an electrostatic precipitator to which an automatic hammering control method for an electrostatic precipitator according to the present invention is applied.

FIG. 2 is a diagram showing an applied voltage detected by a DC high-voltage power supply device.

FIG. 3 is a timing chart of the automatic hammering control method for the electrostatic precipitator according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Electrostatic precipitator 12 ... DC high voltage power supply device 14 ... Discharge electrode 16 ... Dust collection electrode 18 ... Hammer control device 20 ... Thyristor control device 22 ... Thyristor 36 ... Hammer device

Claims (2)

[Claims] 1. A DC high-voltage power supply for detecting a voltage applied to a discharge electrode of an electrostatic precipitator and a discharge current and controlling the applied voltage so that a spark discharge is continuously generated based on the applied voltage and the discharge current. An electrostatic precipitator equipped with a hammering device for hammering the dust-collecting electrode of the electrostatic precipitator in a predetermined cycle to peel off dust adhering to the dust-collecting electrode, wherein the spark discharge When the applied voltage at the time of occurrence of a voltage becomes equal to or lower than a predetermined voltage, the hammering operation of the hammering device is controlled so as to be interrupted in the predetermined cycle. Strike automatic control method. 2. When the applied voltage when the spark discharge occurs is below a predetermined voltage, the application of the applied voltage is stopped and the hammering operation of the hammering device is interrupted in the predetermined cycle. The automatic hammering control method for an electrostatic precipitator according to claim 1, wherein the method is controlled to be performed.