JP3210595B2 - Electric dust collector control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electric precipitator, and more particularly to a control device for stopping an electric precipitator when an abnormality occurs.

[0002]

2. Description of the Related Art In general, a conventional control device for an electrostatic precipitator detects a voltage between a pair of opposed electrodes of a charging section of the electric precipitator, and when the voltage is out of a predetermined range, the electric control is performed. Judge that an abnormality has occurred in the dust collector. Then, based on this determination, the electric precipitator is stopped and a failure is displayed (see Japanese Utility Model Publication No. 7-45376).

[0003]

In an electrostatic precipitator, the voltage between the opposing electrodes may fall out of a predetermined range for a short time. For example, if water drops adhere to the counter electrode,
The voltage between the opposing electrodes may drop and fall outside a predetermined range. Such a voltage abnormality returns to the original state when the water droplet evaporates, and is within a normal range. However, in the control device of the conventional electric precipitator, even if the voltage instantaneously deviates from a predetermined range, it is determined to be abnormal. There was a problem that would be judged.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 is an abnormality detecting means for detecting an abnormality of an electrostatic precipitator having a pair of opposed electrodes to which a high voltage current is applied. And a controller for an abnormal precipitator comprising: an abnormal time processing means for performing an abnormal time process based on an abnormal state detection signal of the abnormal state detecting means. A continuous abnormality determining means for determining whether or not the electric dust collector is continuous during the first measurement time. When an affirmative determination is made, the abnormal time processing means performs abnormal time processing .

[0005] Then, the abnormality detecting means further have a intermittent abnormality determining means determines whether or not abnormality of the electrostatic precipitator occurs intermittently a predetermined plurality number of times or more within a predetermined second measurement time When the intermittent abnormality determining means makes an affirmative determination that the abnormality of the electrostatic precipitator has occurred intermittently a predetermined number of times or more within the second measurement time, a high-voltage current between the two electrodes is determined. Intermittent abnormality processing means for temporarily stopping the application of high voltage current and restarting the application of the high voltage current after the lapse of a predetermined first standby time, wherein the intermittent abnormality determination means makes a negative determination, and the continuous abnormality determination means makes a positive determination. When the determination is made, the abnormal time processing means performs abnormal time processing,
When the intermittent abnormality determination means makes a negative determination and the continuous abnormality determination means makes a negative determination, normal operation of the electric dust collector is continued .

Here, the abnormality detecting means further includes first abnormality judging means for judging whether or not the affirmative judgment by the continuous abnormality judging means is the first judgment after the start of the electric precipitator. When the first abnormality judging means makes an affirmative judgment that the affirmative judgment of the continuous abnormality judging means is the first one, the application of the high-voltage current between the two electrodes is temporarily stopped, and after a predetermined second standby time has elapsed. First time abnormality processing means for resuming application of the high voltage current is further provided, and when the first time abnormality determination means makes a negative determination that the affirmative determination of the continuous abnormality determination means is not the first time, the abnormality time processing means performs abnormal time processing. It is desirable to carry out.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 2 shows an embodiment of the control device 2 of the electric precipitator 1 according to the present invention. The electrostatic precipitator 1 has a charging unit 11 having a pair of opposing electrodes (not shown) composed of a discharge electrode and an opposing electrode, and applies a high voltage between the opposing electrodes of the charging unit 11 as in the conventional case. And a voltage detecting means 13 for detecting a voltage between the pair of opposed electrodes.
Is provided.

The voltage detected by the voltage detecting means 13 is input to the control device 2. The control device 2 determines whether or not the input voltage is within a predetermined range, as will be described later. Consequently, it is determined whether or not the electric precipitator 1 is abnormal. Then, when the voltage is abnormal, the application of the high-voltage current to the counter electrode of the charging unit 11 by the high-voltage circuit 12 is stopped or the application is restarted. Also,
When the electric dust collector 1 is abnormal, the control device 2 sounds the buzzer 3 or turns on the warning lamp 4 to warn the user of the electric dust collector 1.

The control of the electric precipitator 1 by the control device 2 is executed based on a flowchart shown in FIG.
Note that the program based on the flowchart shown in FIG. 1 is started after a predetermined time has elapsed after the start of the electrostatic precipitator 1 and the voltage between the pair of counter electrodes has stabilized. After the start of the program, all memories related to the program are initialized.

First, in step S1, the electric precipitator 1
It is determined whether or not an abnormality has occurred (abnormality detecting means). In this embodiment, this determination is made based on whether the voltage between the pair of opposed electrodes is within a predetermined range or out of the predetermined range. However, the current flowing between the pair of opposed electrodes, or the voltage and the current May be performed based on the power that is the product of If no abnormality has occurred in the electrostatic precipitator 1, step 1 is repeated. Thereby, the abnormality of the voltage between the opposed electrodes is constantly monitored.

When an abnormality occurs in the electric dust collector 1,
In step S2, it is determined whether or not the abnormality is an intermittent abnormality that occurs intermittently a predetermined number of times or more within a predetermined time (second measurement time) (intermittent abnormality determination means). This determination is for determining whether or not the abnormality is temporarily caused by the attachment of water droplets, dust, etc. to the pair of electrodes. The determination time and the occurrence of the abnormality are determined. The number of times is appropriately determined based on experiments.

If the abnormality that has occurred in the electrostatic precipitator 1 is not an intermittent abnormality, it is determined in step S3 whether the abnormality is a continuous abnormality that occurs continuously within a predetermined time (first measurement time). It is determined (continuous abnormality determination means). This determination is for determining whether or not the abnormality is continuous due to disconnection or short-circuit and requires repair. The length of the predetermined time for determination is experimentally determined so that short-term abnormalities due to water drops or the like can be eliminated, but it is preferable that the length be the same as the second measurement time. This is because it is possible to simultaneously determine whether the abnormality is an intermittent abnormality or a continuous abnormality when the first measurement time (second measurement time) has elapsed.

If the abnormality is not a continuous abnormality, the abnormality is temporary and not a true abnormality. Therefore, the control device 2 does not perform any processing on the electrostatic precipitator 1,
It returns to step S1. Therefore, the normal operation of the electric dust collector 1 is continued.

On the other hand, when the abnormality is a continuous abnormality, the abnormality is continuous and a true abnormality. Then, the abnormal time processing is executed by the control device 2 (abnormal time processing means). The processing at the time of the abnormality is the same as the processing by the conventional control device. Here, the stop of the current supply to the pair of counter electrodes of the charging unit 11, the activation of the buzzer 3, and the lighting of the warning lamp 4 are performed. Then, the program ends.

In step S2, the electric precipitator 1
If it is determined that the abnormality that has occurred is an intermittent abnormality, an intermittent abnormality processing is executed in steps S5 to S7 (intermittent abnormality processing means). That is,
In step S5, the application of the voltage to the pair of counter electrodes is stopped, and the timer is started. In step S6, it is determined whether a predetermined time (first standby time) has elapsed after the start of the timer. The first standby time is set to a time necessary to eliminate a temporary abnormality such as a case where water droplets or the like adhere to the pair of counter electrodes, and is determined based on an experiment. Then, when the predetermined first standby time has elapsed, the application of the voltage is restarted in step S7. Then, the process returns to step S1.

In the control device 1, after detecting the occurrence of an abnormality in the electrostatic precipitator 1, it is determined whether or not the abnormality is a continuous abnormality. Since the processing is performed, an abnormality resolved over time, such as a case where water droplets adhere to a pair of opposed electrodes, is not determined to be a true abnormality. Therefore, it is possible to prevent the electric precipitator 1 from being stopped even if it is determined that the electric precipitator 1 is abnormal, or to prevent the electric precipitator 1 from being warned. The frequency of collection for repair can be reduced.

In this embodiment, when an intermittent abnormality occurs, the application of the high-voltage current to the pair of counter electrodes is temporarily stopped, and the application of the high-voltage current is resumed after a predetermined first standby time has elapsed. Since the abnormality is resolved within the first standby time, the operation of the electric dust collector 1 in a state where the abnormality occurs intermittently is prevented, and the operation is performed in a normal state. Can be

Next, another embodiment of the present invention shown in FIGS. 3 and 4 will be described. In the embodiment shown in FIG. 3, the determination order of the determination of the intermittent abnormality and the determination of the continuous abnormality is reversed from that shown in FIG. 1. In step S3, it is determined whether there is an intermittent abnormality. Of course, if it is determined in step S2 that there is a continuous abnormality, the abnormality processing is executed in step S4. If it is determined that there is no continuous abnormality,
In step S3, it is determined whether or not there is an intermittent abnormality. Then, if there is an intermittent abnormality, the processing at the time of the intermittent abnormality is performed in steps S5 to S7, and if it is not an intermittent abnormality, the process returns to step S1.

In the embodiment shown in FIG. 14, between the step S3 for judging whether or not there is a continuous abnormality and the step S4 for executing the abnormal time processing, the judgment of the continuous abnormality in the step S3 is first (first time). To determine whether the determination is the first or second (first time abnormality determination means) Step S
3 'is added, and in the case of the first time, the first time abnormality processing is executed (first time abnormality processing means). in this case,
Steps S5 to S7, which are the same as the intermittent abnormality processing, are executed as the first abnormality processing. However, the application of the high-voltage current to the pair of electrodes is temporarily stopped, and a predetermined time (second
Other processes may be executed as long as the application restart after the elapse of the (standby time) is executed. For example, the second standby time may be different from the first standby time. On the other hand, if the determination of the continuous abnormality is the second time, step S
4 is executed.

Whether or not the continuous abnormality is judged for the first time is determined by whether the content of a predetermined memory (initialized at the start of the program) is 0 (first time) or 1 (second time). It can be determined according to whether there is
After execution of 3 ', 1 may be written to the memory. Further, the order of step S2 and step S3 may be changed as in the case of FIG.

In this embodiment, even when a relatively long time is required for the voltage between the electrodes to return to normal, such as when a relatively large water droplet adheres to a pair of opposed electrodes, Thereby, it can be prevented that the electric precipitator 1 is determined to be abnormal.

The present invention is not limited to the above embodiment, but can be modified as appropriate. For example, in the above-described embodiment, the process returns to step S1 immediately after the execution of the intermittent abnormality processing in steps S5 to S7. It is determined whether or not the process has been performed a plurality of times. If the process has been performed a plurality of times, an abnormal-time process may be performed, and the process may return to step S1 only when the process has not reached the predetermined number.

[0023]

As described above, according to the first aspect of the present invention, it is possible to prevent the electric dust collector from being determined to be abnormal even though it is normal. The effect of greatly reducing the time required for collection, inspection, re-equipment, and the like for repairing the electric dust collector can be obtained. In addition, it is possible to prevent the electric precipitator from being operated in a state where an abnormality occurs intermittently, and to operate the electric precipitator after returning to a normal state. According to the second aspect of the present invention, it is possible to further prevent the determination that the electric precipitator is abnormal even though the electric precipitator is normal.

[Brief description of the drawings]

FIG. 1 is a diagram showing a flowchart of an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration diagram of a control device for implementing the flowchart shown in FIG. 1;

FIG. 3 is a diagram showing a flowchart of another embodiment of the present invention.

FIG. 4 is a diagram showing a flowchart of still another embodiment of the present invention.

[Explanation of symbols]

 1 electric dust collector 2 control device

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B03C 3/00-3/88

Claims (2)

(57) [Claims] 1. An abnormality detecting means for detecting an abnormality of an electrostatic precipitator having a pair of opposed electrodes to which a high-voltage current is applied, and an abnormality processing for performing an abnormality processing based on an abnormality detection signal of the abnormality detecting means. Means , the abnormality detection means has a continuous abnormality determination means for determining whether the abnormality of the electrostatic precipitator is continuous during a predetermined first measurement time, this continuous abnormality determination means, The controller of the electric precipitator, wherein when the abnormality of the electric precipitator is determined to be continuous during the first measurement time, the abnormal time processing means performs the abnormal time processing.
A is, the abnormality detecting means, abnormality of the electrostatic precipitator further comprises an intermittent abnormality determining means determines whether or not occurs intermittently a predetermined plurality number of times or more within a predetermined second measurement time When the intermittent abnormality determining means makes an affirmative determination that the abnormality of the electrostatic precipitator has occurred intermittently a predetermined number of times or more within the second measurement time, the high-voltage current between the two electrodes is determined. Intermittent abnormality processing means for temporarily stopping the application and restarting the application of the high-voltage current after the elapse of a predetermined first standby time is further provided, wherein the intermittent abnormality determining means makes a negative determination, and the continuous abnormality determining means makes an affirmative determination. When the abnormal condition processing means performs abnormal time processing, the intermittent abnormality determining means makes a negative determination, and when the continuous abnormality determining means makes a negative determination, the normal operation of the electrostatic precipitator is continued. Characteristic Control apparatus for an electric precipitator to. 2. The abnormality detecting means further comprises an initial abnormality judging means for judging whether or not the affirmative judgment by the continuous abnormality judging means is the first judgment after the start of the electrostatic precipitator. When the abnormality determination means makes an affirmative determination that the affirmative determination of the continuous abnormality determination means is the first, the application of the high-voltage current between the two electrodes is temporarily stopped,
First time abnormality processing means for restarting application of the high-voltage current after a predetermined second standby time has elapsed is further provided, and when the first abnormality determination means makes a negative determination that the affirmative determination of the continuous abnormality determination means is not the first, The control device for an electrostatic precipitator according to claim 1 , wherein the abnormal time processing means performs an abnormal time process.