JPS627457A - Power source apparatus for electric dust precipitator - Google Patents

Abstract

PURPOSE:To obtain an electric dust precipitator having dust collection efficiency while performing charging corresponding to the electric specific resistance of dust, by providing a high voltage change-over apparatus for manually or automatically changing over a pulse charging circuit and a DC charge operation circuit. CONSTITUTION:A pulse charging power source apparatus is equipped with high voltage change-over apparatuses 4, 5 and constituted so as to separate a pulse generator 25. The output 12 from a rectifier 3 being DC high voltage is directly connected to a discharge electrode 9 to enable even DC charging other than pulse charging. By using a control apparatus 11, pulse charging or DC charging can be automatically selected by arbitrary internal and external orders. Therefore, a charging method can be automatically selected in keeping the trouble of the pulse generator 25 or the variation in the condition of collected dust by manual operation or by using the control apparatus 11.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a power supply device for an electrostatic precipitator (hereinafter abbreviated as GP), which operates a high voltage switching device to selectively switch between Mars charging and DC charging. This article relates to a GP power supply device that can be used.

[Conventional technology]

As shown in FIG. 6, the conventional GP power supply device is a DC high voltage generator (the output of which is connected to a discharge electrode), which is composed of a high voltage transformer 47 equipped with a 1 AC primary side power control device 46, and a rectifier 48. 49 and the dust collection electrode 50), however, recently, a charging method called pulse charging has begun to be put into practical use in EP as a countermeasure for reducing the dust collection performance due to the properties of collected dust.

This mild charging method repeatedly applies a pulse-like high voltage between the discharge electrode and the dust collection electrode of the EP, waiting for the acidic rise. This method significantly improves the reduced toughness caused by the abnormal discharge phenomenon (called reverse ionization) that occurs due to extremely high temperature, and its basic power supply configuration is as shown in Figure 4. The pulse high voltage generated from the generated electric wound 40 and the DC high voltage generated from the DC high voltage power supply 4 are capacitively coupled by the coupling capacitor 42, and the high voltage is superimposed on the DC high voltage, and the IMF's free rt pole is There are two possible methods: a so-called two-power supply coupling type in which the voltage is applied to the BP 43, and a so-called @-connection type in which the output of the pulse generating power supply 44 as shown in FIG. 5 is directly connected to the discharge electrode 45 of the BP.

・As mentioned in iJ, the cell charging method is considered to be particularly effective as a countermeasure against reverse ionization, but this reverse ionization phenomenon becomes more pronounced as the electrical resistivity of the collected dust increases, and therefore
As shown in the figure, in direct current charging using the conventional power supply device shown in FIG. 6, the performance deteriorates as the electrical resistivity of the collected dust increases. On the other hand, in the case of .Grus charging, in general, when the electrical resistivity of the collected dust is high, the improvement rate of the performance compared to DC charging is high, and conversely, when it is low, the improvement rate is low. In other words, it exhibits a characteristic that DC charging and dust collection performance are almost the same.

[Problem that the invention seeks to solve]

As is obvious, in the above-mentioned power supply device for direct current charging and power supply device for glucose charging, the charging method is uniquely fixed. Therefore, when the electrical resistivity of the collected dust varies greatly depending on the type of coal used, such as in BP for coal-fired boilers, if the electrical resistivity of the collected dust is low due to the characteristics shown in Figure 3, Although it is ineffective in terms of dust collection performance, it will operate with medium irradiation, consuming excess power and wearing out component parts. On the other hand, when a power supply device for DC charging is adopted, DC charging alone cannot deal with the drop in dust collection performance when the electrical resistivity of the collected dust becomes rounded due to changes in the type of coal used or other changes in conditions.

In addition, if a pulse generator is used, if the pulse generator fails, it will not be possible to perform quick backup processing and continue operation, and the charging will stop in that category. was.

An object of the present invention is to provide a GP power supply device that can solve the above-mentioned conventional problems.

[Means for solving problems]

The EP power supply device according to the present invention includes: (1) a rectifier controlled by an AC primary side power control device via a high voltage transformer; and a first high voltage switching device connected to the output side of the rectifier. , a pulse generator having a capacitive energy storage element and a fast switching device connected to one side thereof; a second high voltage switching device connected to the output side thereof and interlocking with said @1 high voltage switching device; A discharge electrode and a voltage detection device connected in parallel on the output side, and the
The output of the rectifier is directly connected to the discharge electrode by controlling the AC primary side power control device by a voltage detection device, and the first and second high voltage switching devices are controlled, or the output of the rectifier is directly connected to the discharge electrode. The device is characterized by comprising a control circuit that switches and controls whether or not to connect via the pulse generator.

The 1JL source device for F and P according to the present invention is (2)
a first rectifier controlled by a first AC primary power control device via a first high-voltage transformer; a pulse generator having a capacitive energy storage element and a high-speed switching device connected to the output side thereof; a waveform shaping resistor connected to the output side, a discharge electrode and a voltage detection device connected in parallel to the output side via a coupling capacitor and a high voltage switching device, and the first AC primary side controlled by the voltage detection device. a control circuit that controls the power control device and the high-voltage switching device; and a second arm whose output side is connected to the discharge electrode and is controlled by the second AC primary side power supply @ device via the second high-voltage transformer. It is characterized by being equipped with a sink. That is, in the present invention, (1) By providing a high voltage switching device in the configuration of the pulse charging power supply device, the noyals generating section is separated and the output of the DC high voltage generator, which is one of the components, is switched to the EP discharge. By connecting directly to the electrode, it is possible to perform direct current charging in addition to Cruz charging.

(2) By using an automatic high-voltage switching device, a malfunction in the glucose generating section or any internal or external command is detected, and based on that, the high-voltage switching device is activated to automatically switch off the glucose charging or It is now possible to select "if cargo is transported" and continue operation.

[Effect]

According to the present invention, the high-voltage switching device provided in the pulse charging power supply device can be operated manually or automatically based on internal or external commands, and the high-voltage switching device provided in the pulse charging power supply device can be operated as desired, so that either the pulse charging operation circuit or the DC charging operation circuit can be operated. , and perform two operations.

〔Example〕

Hereinafter, the EP power supply device of the present invention will be explained with reference to the drawings. FIG. 1 shows an example of the case where it is applied to the direct @ type pulse load formation power supply device described above in FIG. 5.
Accordingly, the output of the high voltage transformer 2 and the output of the rectifier 3 are adjusted by n. The output 12 of the rectifier 3 is a high voltage switching device "vi4
The contact 19 is connected to the conductive wire 13, and the contact 18 is connected to the conductive wire 14, respectively, and these are the DC charging side and the Jars charging side, respectively. Connected to the conductor 14 are a capacitive energy storage element 6 (such as a high-voltage capacitor, a high-voltage coaxial cable, etc., hereinafter referred to as a capacitor) of a cell generator 25 and a high-speed switching device 7 . Here, a spark gap or the like is typically used as the high-speed switching device 7, but a hydrogen thyratron or a high-speed thyristor may also be used. The output of the high-speed switching device 7 is connected via a four-wire 15 to a contact 20 of the second high-voltage switching device 5 . On the other hand, 14NJJz
s is connected to the contact 2 of the high voltage switching device 5, and the common contact 22 thereof is connected to the discharge electrode 9 of the EP via a conductor 16. Further, the multiplier pole 1o is grounded.

The high voltage switching devices 4 and 5 are operated manually or electrically, for example, when pulse charging is selected, the common contact 17 of the high voltage switching device 4 is used.
is connected to the contact 18 (contact 19), and the common contact 22 of the high voltage switching device 5 is connected to the contact 20 (contact 21).

The AC primary side power control device 1 is based on the control circuit 11,
The primary AC power of the high voltage transformer 2 is adjusted, and the output DC high voltage of the rectifier 3 is adjusted.

When the above-mentioned high voltage switching device 4.5 selects the nosol charging side t- either manually or by the command S from the koji control circuit 1, the output 12 of the rectifier 3 is switched between the common contact 17 and the contact 18.
, is connected to the capacitor 6 via the conducting wire 14, charges it to a predetermined voltage (10 to 100), and at an arbitrarily determined timing, the high-speed switching device 7 conducts, and the charging t1! If the load is steep, the conductor 15, contact 20. A pulse loading operation is performed in which a discharge is generated through the common contact 22.4i and a high voltage having an extremely fast rise is repeatedly applied between the discharge electrode 9 and the discharge electrode 0.

Further, when the high voltage switching device 4.5 similarly selects the DC charging side, the output 12 of the rectifier 3 passes through the common contact 17, the tower point I9, the conductor 13, the contact 2, the common contact 22, the conductor 16, It is connected to the discharge electrode 9 and performs DC charging operation.

Needless to say, the above-mentioned switching of the charging method can be performed by manual operation of the high voltage switching device 4.5, but automatic switching as described below can also be performed.

(1) Automatic switching of charging method depending on the charging state It is generally known that when the above-mentioned reverse ionization phenomenon becomes severe, the average value of the charging voltage decreases compared to the normal state. The forming voltage signal V is input to the control device 11, the average value Va of the charging voltage is calculated, and this average value and the setting value VI of the setting device 23 (Vl is 10 to 10 as the average value of the charging voltage)
0 adjustment range), and in the case of Va (V), it is determined that reverse ionization has become intense, and a switching command to the pulse charging side is issued only when the high voltage switching device 4.5 has selected the DC charging side. S and make this work.Of course,
It does not work if the pulse charging side has already been selected.

Similarly, it is compared with the setting value V2 of the setting device 24 (V2 is an adjustment range of 10 to 100 as the average value of charged electrons), and if Va>v2, it is determined that it is a normal state in which no reverse ionization occurs, and the high voltage Only when the switching device 4.5 selects the i4 rus charging side, it sends and operates the switching command S to the DC charging side. The above detects the charged state,
This is one embodiment that operates based on this, but there are various other methods for detecting the charged state, such as detecting the acupuncture flow flowing through the EP and using the value thereof.

(2) Automatic switching in case of failure of pulse generator When a failure of capacitor 6 or high-speed switching device 7, which is a component of pulse generator 25, is detected by a method not particularly limited in the present invention, for example, high-speed switching device 7
Since it is impossible to continue the Noyalus charging operation, a switching command S to the DC charging side is sent to the high voltage switching device 4.5 to activate it.

In addition to the automatic switching described above, by inputting an arbitrary switching command from the outside to the control device 11, it is possible to select the base charging side or the DC charging side in a similar operation.

On the other hand, FIG. 2 shows another embodiment of the present invention when applied to the two-power-supply combination type Noculus charging power supply device described in FIG. 4. Reference numerals 1 to 3 and numbers 6 to 1 in FIG. 2 are the same as the components already described in FIG. The output DC high voltage of the conventional DC high voltage generator shown in FIG. A coupling capacitor 31 for the purpose of capacitive coupling between
It is composed of a high pressure switching device 32 for separating the six-metal gold.

In this embodiment, the above-mentioned switching of the IE DC charging and the ladleless charging is performed by turning the high voltage switching device 32 ON (pulse charging) and OFF (
(DC charging), and its operation is exactly the same as that of the direct connection type described above.

Note that the high voltage switching device 4.5 in FIG. 1 and the high voltage switching device 32 in FIG. Anything is fine, for example 'I! The present invention does not particularly require a combination of a motive and a chain or an electromagnetic type. Moreover, this high voltage switching device 4, . 5. The operation of J2 must be performed when the voltage applied to each is temporarily set to O or lowered to a predetermined level. ,
Or, it goes without saying that a command for outputting 0 is issued.

〔Effect of the invention〕

As detailed above, according to the R6 source device for EP according to the present invention, one unit can arbitrarily select between pulse charging operation and DC charging operation, and charge the charged group of the connected EP in two ways. and the charged state of the charged chamber, or
EP
As a power supply device, it can flexibly deal with fluctuations in conditions such as collected dust, and can provide excellent effects such as improved reliability because it can be upgraded in case of failure.

[Brief explanation of drawings]

Figures 1 and 2 are examples of the present invention, showing the direct coupling type and the two-electrog coupling type, respectively; Figure 3 is a diagram showing the dust collection performance based on the electrical specific resistance of the collected dust; 6A to 6 are schematic configuration diagrams of a two-electrode combination type, a one-hundred-tie type pulse charging electric device, and a conventional electric wire, respectively. 1... AC #f, primary side power control device, 2... High voltage transformer, 3... Rectifier, 4, 5.32... High voltage switching device, 6... Capacitive energy storage element , 7... High-speed swing length device, 9... Discharge electrode, 10... Fruit cone electrode, 25... Pulse generator. Fig. 4 Mumu Fig. 6 Fig. 6 - +'ss'')・4・i5゜Michibe Uga, Commissioner of the Patent Office 1, Indication of the case Patent Application No. 1983-147199 2, Name of the invention Electric industrial dust equipment Power supply device for use 3. Relationship with famous case for amendment Patent applicant (620) Mitsubishi Heavy Industries, Ltd. 4. Successor attorney 5. Spontaneous amendment 7. Contents of amendment (1) Amend the scope of patent claims in the attached document (2) “(Eng.)” on page 6, lines 3 to 17 of the specification.
It is characterized by the fact that it is transmitted through a high-voltage transformer. "(1) A rectifier controlled by an AC primary side power control device via a high voltage transformer, a first high voltage switching device connected to the output side thereof, and a first high voltage switching device having two switching contacts. a pulse generator having a capacitive energy storage element and a fast switching device connected to one contact side of the first high-voltage switching device, the output of which is connected to one contact side of the first high-voltage switching device; The remaining contacts of the first high voltage switching device and the remaining contacts of the second high voltage switching device are electrically connected, and the output of the second high voltage switching device The first high voltage switching device and the second high voltage switching device are operated manually or by an external command or automatic control, and the discharge electrode and the voltage detection device are connected in parallel to each other. The present invention is characterized in that it is possible to select whether the output of the rectifier is directly connected to the rectifier, or connected via the .f pulse generator. 2. Claims (2) A rectifier that also controls an AC primary side power control device via a high voltage transformer, a first high voltage switching device connected to the output side of the rectifier, and two 9 lus generator having a high-speed switching device and a capacitive energy storage element connected to one contact side of the first high-voltage switching device having a switching contact, the blade of which is interlocked with the first high-voltage switching device; Similarly, it is connected to one contact of a second high voltage switching device having two switching contacts, and the remaining contact of the first high voltage switching device and the remaining contact of the second high voltage switching device are electrically connected. The first high-voltage switching device and the second high-voltage switching device can be controlled manually, externally, or automatically. Is the discharge electrode directly connected to the rectifier blade or A? A power supply device for electrical industrial dust equipment, characterized in that it is possible to select whether to connect it via a pulse generator. (2) The power supply device for an electrical industrial dust device according to claim 1, wherein the AC primary side power control device is controlled by the detected value of the voltage detection device. 2. The power supply device for an electrical industrial device according to claim 1, wherein the first high voltage switching device and the second high voltage switching device are automatically controlled by the detected value of the voltage detection device. (4) a pulse generator having a first rectifier controlled by a first AC primary side power control device via a first high-voltage transformer, a capacitive energy storage element and a high-speed switching device connected to the output side thereof; A device, a waveform shaping resistor connected to its output side, a discharge electrode and a voltage detection device connected in parallel to its output side via a coupling capacitor and a high voltage switching device, and controlled by the voltage detection device a control circuit that controls the first AC primary side power control device and also controls the high voltage switching device; and a second AC primary side power control device whose output side is connected to the discharge electrode via a second high voltage transformer. 1. A power supply device for an electrical industrial dust device, comprising: a second rectifier that is controlled in a controlled manner.

Claims (2)

[Claims] (1) A rectifier controlled by an AC primary side power control device via a high voltage transformer, a first high voltage switching device connected to its output side, a capacitive energy storage element connected to one side thereof, and a high speed a pulse generator having a switching device; a second high voltage switching device connected to its output side and interlocking with the first high voltage switching device; a discharge electrode and a voltage detection device connected in parallel to the output side; controlled by a detection device to control the AC primary side power control device, and to control the first and second high voltage switching devices to connect the output of the rectifier to the discharge electrode directly or via the pulse generator. 1. A power supply device for an electrostatic precipitator, comprising: a control circuit that switches and controls whether the device is connected or not. (2) a first rectifier controlled by a first AC primary side power control device via a first high-voltage transformer; a pulse generator having a capacitive energy storage element and a high-speed switching device connected to the output side thereof; , a waveform shaping resistor connected to the output side thereof, a discharge electrode and a voltage detection device connected in parallel to the output side via a coupling capacitor and a high voltage switching device, and the first alternating current controlled by the voltage detection device. a control circuit that controls the primary side power control device and also controls the high voltage switching device; A power supply device for an electrostatic precipitator, characterized by comprising a rectifier.