JP2015044134A - Electric dust collector, and dust amount estimation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a dust density meter is highly expensive and needs a high frequency of maintenance in the structure, in which a watt consumption is reduced while maintaining a dust collection efficiency by measuring the dust concentration on the outflow side of an electric dust collector by a dust concentration meter and by adjusting the applied voltage to the dust collector in accordance with the dust concentration metered.SOLUTION: A dedicated dust density meter is made unnecessary by measuring electric currents of a high-voltage electrode 2 and an opposed electrode 3 of a charging part 1, and a dedicated dust density meter is made unnecessary by knowing a quantity of the dust passing in a dust collector by the difference between the electric currents so that reduction in the watt consumption of the high-voltage electrode according to the dust concentration can be performed inexpensively in a maintenance-free manner.

Description

  The present invention relates to an electric dust collector that collects atmospheric dust, indoor dust, dust and the like in air conditioning and industrial fields.

  2. Description of the Related Art Conventionally, an electrostatic precipitator that collects particles includes a charging unit that charges particles and a dust collecting unit that attracts and collects charged particles by the force of an electric field.

The electrostatic precipitator has a one-stage type in which the high-voltage electrode and counter electrode of the charging unit and the dust-collecting unit are the same electrode, and a two-stage type in which the high-voltage electrode and counter electrode of the charging unit and the dust collecting unit are separately provided. There are things.
The one-stage type has a simple structure but low dust collection efficiency, and the two-stage type has a feature that the structure is complicated but the dust collection efficiency is high.

As an electric dust collector that reduces power consumption while maintaining the conventional dust collection efficiency, there is an electric dust collector as shown in FIG.
The electric dust collector of FIG. 2 includes a dust collector 101, a high-voltage power source 102 that supplies a high voltage to the dust collector 101, a dust concentration meter 103 installed on the wind outflow side of the dust collector 101, and a high-voltage power source. The control unit 104 is configured to control the control unit 102.

  The control device 104 can intermittently control the output voltage of the high-voltage power supply 102.

  If it is determined from the signal of the dust concentration meter 103 that the dust concentration is low, the ratio of the ON time to the OFF time (DUTY) of the output voltage of the high-voltage power supply 102 is changed to shorten the charging time per unit time. The power consumption of the electric dust collector is reduced while maintaining the dust collection efficiency.

JP-A-3-4257

  In such a conventional electrostatic precipitator, a dedicated dust concentration meter is required to measure the dust concentration. Moreover, the dust type concentration meter is mainly an optical type, but the optical type is very expensive because of its complicated structure. In addition, since the amount of dust cannot be measured correctly when the lens is dirty, there is a problem that the lens needs to be maintained each time it is measured.

  The present invention solves such a conventional problem, and estimates the amount of dust from the difference in current value flowing between the high-voltage electrode and the counter electrode of the charging unit, and adjusts the output voltage of the high-voltage power supply according to the amount of dust. To do. Thereby, the reduction of the power consumption of the high voltage | pressure power supply according to the amount of dust can be performed cheaply and maintenance-free.

The present invention
A charging part and a dust collecting part, in which high-voltage electrodes and counter electrodes are alternately arranged in parallel,
A dust collector comprising a charging unit and a high voltage power source for applying a voltage to the dust collecting unit,
High-voltage electrode current measuring means for measuring the current of the high-voltage electrode of the charging unit;
Counter electrode current measuring means for measuring the current of the counter electrode of the charging unit;
A voltage adjusting unit is provided for adjusting an output voltage applied to the charging unit based on a difference between current values measured by the high-voltage electrode current measuring unit and the counter electrode current measuring unit.

  According to the present invention, since the dust concentration can be grasped without using a dedicated dust concentration meter, the power consumption of the high-voltage power supply according to the dust concentration can be reduced at low cost and maintenance-free.

The figure which shows the structure of Embodiment 1 of this invention. Simplified diagram showing conventional configuration

  The electrostatic precipitator according to claim 1 of the present invention includes a charging unit and a dust collecting unit in which high-voltage electrodes and counter electrodes are alternately arranged in parallel, and a high-voltage power source for applying a voltage to the charging unit and the dust collecting unit. A high-voltage electrode current measuring unit that measures a current of a high-voltage electrode of the charging unit, a counter-electrode current measuring unit that measures a current of a counter-electrode of the charging unit, and the high-voltage electrode It is characterized by comprising voltage adjusting means for adjusting the output voltage applied to the charging portion based on the difference between the current values measured by the electrode current measuring means and the counter electrode current measuring means.

  In this configuration, the amount of dust in the dust collector is estimated from the difference in current value between the high-voltage electrode and the counter electrode, and the output voltage of the high-voltage power supply is adjusted according to the estimated dust amount. Thereby, reduction of the power consumption of a high voltage power supply can be performed inexpensively and maintenance-free.

  The dust amount estimation means according to claim 2 of the present invention includes a high-voltage electrode and a counter electrode that are arranged to face each other, a high-voltage power source that applies a high voltage between the high-voltage electrode and the counter electrode, and a current of the high-voltage electrode. Using the high-voltage electrode current measuring means for measuring and the counter-electrode current measuring means for measuring the current of the counter electrode, when passing dust between the high-voltage electrode and the counter electrode, the high-voltage electrode current measuring means and the counter The amount of dust is estimated based on the difference in current value measured by the electrode current measuring means.

  In this configuration, the current value of the high voltage electrode and the counter electrode can be measured to calculate the difference, and the dust amount can be estimated from the result.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
As shown in FIG. 1, the electrostatic precipitator of the present invention includes a high voltage electrode 2 and a counter electrode 3, a dust collector 4, a high voltage power source 5 for supplying high voltage to the charger 1, and a dust collector. 4, a high-voltage power supply 6 that supplies a high voltage to 4, a current sensor 7 that measures the current of the high-voltage electrode 2, a current sensor 8 that measures the current of the counter electrode 3, and the difference between the current values measured by the current sensor 7 and the current sensor 8 And it is comprised from the voltage regulator 9 which adjusts the output voltage of the high voltage power supply 5 based on the result.

  First, selection and arrangement of the current sensor 7 will be described.

  Although the current sensor 7 is installed in a high voltage portion, the voltage regulator 9 operates at a low voltage, and therefore, in order to connect the current sensor 7 to the voltage regulator 9, it has a high withstand voltage therebetween. A connection circuit is required.

Since this high breakdown voltage connection circuit is large and expensive, in order to avoid this in the present invention which is one of the objectives of low cost, an insulation type current sensor is connected to the high voltage cable connecting the high voltage power source 5 and the high voltage electrode 2. Install (current transformer type).

  With this configuration, since the high voltage cable itself has a withstand voltage, the current sensor 7 and the voltage regulator 9 can be connected without a high withstand voltage circuit by directly inserting an insulating sensor into the high voltage cable. .

  Next, a process for collecting dust with an electric dust collector will be described.

  First, a high voltage is applied between the high voltage electrode 2 and the counter electrode 3 in the charging unit 1 to generate corona discharge. A corona current flows in a region where the corona discharge is generated, and when dust passes there, the dust is charged by colliding with electrons of the corona current.

  The charged particles are attracted to the electrodes by the action of an electric field generated between the electrodes of the dust collecting unit 4 and collected. By this action, the air that has passed through the dust collector becomes clean air from which dust has been removed. The high output voltage applied between the electrodes at this time is preferably low from the viewpoint of safety, but 8 kV or more is required in order to obtain an appropriate processing air volume, processing air speed, and dust collection efficiency.

  Next, features of the present invention will be described.

  The dust charged by the corona current in the charging unit 1 flows to the dust collecting unit 4 as it is combined with the electrons. That is, some electrons are lost between the high-voltage electrode 2 and the counter electrode 3 of the charging unit 1. In other words, it means that there is a difference in the current value of the lost electrons between the current flowing through the high-voltage electrode 2 and the current flowing through the counter electrode 3.

  When the amount of dust passing between the electrodes of the charging unit 1 is large, the amount of charge on the dust increases and the amount of lost electrons increases, so that the difference in current value between the high-voltage electrode 2 and the counter electrode 3 increases. In this case, it can be determined that the amount of dust passing through the charging unit 1 is large.

  On the contrary, when the difference between the current values of the high voltage electrode 2 and the counter electrode 3 is small, it can be determined that the amount of dust is small because the amount of electrons lost is small because the amount of charge on the dust is small.

  Thus, the amount of dust passing through the dust collector can be estimated from the difference between the current values flowing through the high-voltage electrode 2 and the counter electrode 3.

  As described above, the voltage regulator 9 calculates the difference between the current values measured by the current sensor 7 and the current sensor 8, estimates the amount of dust based on the result, and adjusts the output voltage of the high-voltage power supply 5. When it is determined that the amount of dust is small, it may be considered that the charging ability of the charging unit 1 to the dust has sufficient capacity, and the dust collection efficiency can be maintained even if the charging ability is reduced. Therefore, by reducing the output voltage of the high-voltage power supply 5, it is possible to reduce the power consumption of the charging unit 1 while maintaining the dust collection efficiency. When the amount of dust is large, the voltage regulator 9 performs a process of increasing the output voltage to the charging unit 1.

  In the above description, the output voltage to the charging unit 1 is adjusted by reducing the output voltage. However, the same effect can be obtained by changing the output voltage DUTY.

  When it is determined that the amount of dust is small, not only the output voltage to the charging unit 1 but also the output voltage to the dust collecting unit 4 may be reduced at the same time, and the power consumption can be reduced.

  In addition, this invention can exhibit the effect in the two-stage type dust collector which charges with the charging part 1 with respect to dust, and collects with the dust collection part 4. FIG.

  Further, by applying the current measurement at the charging unit 1 in the present embodiment, the concentration (measurement) of the dust flowing between the high voltage electrode 2 and the counter electrode 3 can be estimated. That is, the difference between the current flowing through the high-voltage electrode 2 and the current flowing through the counter electrode 3 when air having a predetermined dust concentration is flowed into the charging unit 1 under a constant wind speed and a predetermined applied voltage is stored. . The stored dust concentration can be estimated by comparing the difference between the current flowing in the high voltage electrode 2 and the current flowing in the counter electrode 3 when actually measured.

  The present invention can be applied to an electric dust collector for industrial equipment.

DESCRIPTION OF SYMBOLS 1 Charging part 2 High voltage electrode 3 Counter electrode 4 Dust collection part 5 High voltage power source 6 High voltage power source 7 Current sensor 8 Current sensor 9 Voltage regulator

Claims (2)

A charging part and a dust collecting part, in which high-voltage electrodes and counter electrodes are alternately arranged in parallel,
A dust collector comprising a charging unit and a high voltage power source for applying a voltage to the dust collecting unit,
High-voltage electrode current measuring means for measuring the current of the high-voltage electrode of the charging unit;
Counter electrode current measuring means for measuring the current of the counter electrode of the charging unit;
An electrostatic precipitator comprising voltage adjusting means for adjusting an output voltage applied to the charging unit based on a difference between current values measured by the high voltage electrode current measuring means and the counter electrode current measuring means. . A high-voltage electrode and a counter electrode arranged opposite to each other
A high voltage power source for applying a high voltage between the high voltage electrode and the counter electrode;
High-voltage electrode current measuring means for measuring the current of the high-voltage electrode;
Using counter electrode current measuring means for measuring the current of the counter electrode,
When passing dust between the high-voltage electrode and the counter electrode,
A dust amount estimation method, wherein the dust amount is estimated based on a difference between current values measured by the high-voltage electrode current measurement unit and the counter electrode current measurement unit.

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