JPS58260A - Electric precipitation of dust - Google Patents

Abstract

PURPOSE:To improve the efficiency of dust collection and reduce the power consumption, by inserting a voltage adjuster or a variable reactor to the primary side when the frequency power in the primary side is convered to a DC high voltage in the secondary side through a transformer, a thyristor, etc. CONSTITUTION:When a slidac SD1 is turned down to reduce its output voltage V1R' a firing angle alpha of a thyristor SCR is smaller, and a conduction angle beta is larger, and an EP applied voltage V2R becomes smooth as shown by broken lines G (1). When the output voltage V1R is increased, the firing angle alpha of the thyristor SCR is larger, and the conduction angle beta is smaller, and the waveform of the EP applied voltage V2R becomes sharp as shown by solid lines H (2). Said charging method (1) is applied to dusts easy to collect, and said intermittent charging method (2) is applied to dusts difficult to collect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to Himi 1iFi electrostatic precipitator. The type of cyrisk control method conventionally used as a cylindrical overturning device is the first one.
As shown in the circuit diagram in Figure 5, the input voltage and current of the commercial frequency are controlled by the thyristor 8c, and after being boosted by the high voltage transformer MT, J115! Convert to DC using I1gcr,
This is applied to the dust collecting electrode EPK to control the thyristor 8CR according to the output of /f pulse generation-PIG, but in the conventional control method, there is a shadow on the waveform control φ of the applied voltage and current) However, there is a drawback that sufficient and effective #Ls control is not possible, especially for collecting high-resistance dust.

Himiq4HiroζOIt was proposed in light of the situation,
The purpose is to provide an electrostatic precipitator that improves dust collection efficiency and minimizes power consumption even for IL and resistance strikes. Convert it to a secondary side 0101 high voltage through the secondary side and apply it to the dust collecting electrode to collect dust. It is assumed that 41111 controls the secondary side output waveform by.

To explain the Himi-0II example in terms of INNK, the circuit diagram showing the actual example of Iris 2, the output waveform diagram of each part of the third cause, and the output waveform diagram of each part. (2) When the output voltage of line voltage adjustment is relatively small, the same mol) Figures 4 and 5 show the case where the output voltage of aoka is relatively large, respectively. Indicate the power of each! Figures 1 and 516 show the 211th!111th example of the present invention, the grip, and the 7th! l[
tOgljl! K, Fig. 8, and (B) are the waveform diagrams of the primary voltage and current in Fig. 7, respectively, and (4) in the same figure, when the inductance of the Fi9 actor is relatively large i, the figure φ) is the inductance of the same reactor. Figure 9 shows the cases in which is relatively small. The diagram showing the relationship between the secondary voltage and secondary current of the multi-voltage transformer in g, *1os(4), 俤) is the waveform diagram of the secondary current when the secondary voltage is 60Hg, and the same @IcA) shows the case where the inductance of the reactor is relatively large, and Figure 4) shows the case where the inductance of the reactor is relatively small.

First, in the example of Iris 2 prisoners, 1 hczzov
thco~zsovtcllfi slider, ri8
D, 2 is Nofrus occurrence 4! Thyristor that changes the firing angle from 0 to 180@ according to the output signal from IS, 4 is a high voltage transformer that boosts the primary voltage 50V controlled by thyristor 2 to secondary voltage V, K, ta, C is the voltage v
2 to DC to obtain a DC charging voltage v1. 7 is a dust collection electrode]cP″eAme.

In such a device, the relationship between the negative side voltage, the secondary side, that is, the applied voltage, and the current waveform will be explained based on the condition that the load voltages aX and X are constant.

First, reduce the middle slider and SD, and its output voltage v1B
When jlIa is made small, the firing angle α of thyristor lIcl0 becomes small, that is, the conduction angle β
is large, IP applied voltage v2. Fi same figure (to) broken line G
K becomes smooth as shown.

Next, if the output voltage v1m of the OD slider 8D is increased, the firing angle α of the cylinder cm becomes large, that is, the conduction angle β
is small j) 1EP applied voltage v2. 8-alIOIi
l! 1011 to t01
It has been proven through numerous O tests that intermittent RONA discharge is effective for preventing reverse ionization of RONA dust in the 1Ω-5110 range, so it is suitable for dust that is easy to collect. For the dust collection electrode EP, the charging method described above is used, and for the dust collecting electrode EP, the charging method described above is used, and for the dust collecting electrode EP, the charging method described above is applied, and for the dust collecting electrode EP,
The intermittent charging method described in detail is then applied.

In this way, assuming that the dust collection efficiency and power consumption are constant, the stripes 4
As shown in the figure, the conventional primary voltage 50v for βd-10~101sΩ-country dust.

801 In the case of the charging method with a firing angle of 60°, it is the aP point,
In this device, if the primary voltage is 80V and the firing angle is 135@, the peak value of the spark voltage and current is X.

□ rises sharply, so as shown in curve PP',
The dust collection efficiency is improved by 10 to 20 degrees, and the power consumption is compared with the same dust collection efficiency as shown in 5 WiA. In this case, the primary voltage is 65 V.
, 801 and a firing angle of 135@, it is reduced by 10 to 60%, as shown by curve PP'.

However, in the above embodiment, the output voltage v of sD and the firing angle α of 1 and 8CR are
It is controlled by the 1% rate and the dust moe IO output signal 4# attached to the dust collection electrode outlet.

Next, in the llN611O iris 811 embodiment, 21 is the thyristor-11 controlled by the thyristor control-811.
2 Hiro reactor control circuit 1aK) Controlled variable reactor, JJl'i high voltage transformer, 14 Hiro flow generator, 2-expansion electrostatic precipitator, 2r is the medium dust chain gauge, 28 Hiro reactor control circuit It is.

In such a device, the thyristor control circuit 2I is
The value of the variable reactor 22 is automatically changed by the spark detector, V/I and dust 11f meter 2r, and the value of the variable reactor 22 is automatically changed according to the feedback signal from the dust 11f. When the dust concentration is high, the variable reactor 22 is adjusted to reduce the firing angle α of the thyristor and increase the conduction angle β, increasing the electric current supply time and amount, and increasing the voltage. The resistance of the JK dust is high and reverse ionization occurs, which is detected by the 1x7iv relationship and detected by the medium attached to the precipitator outlet. When the dust a degree meter 21 exceeds the design value #i, the variable reactor 11 is decreased, the firing angle a of the thyristor is increased, the conduction angle β is decreased tcL, and the opening angle during supply is short. It is possible to supply a sufficient current without threatening back ionization of the dust.

When a commercial power source is applied to the terminal A-1 in the 7th cycle, the ignition phase angle signal from the thyristor control mxx causes the ignition ristor 11 to ignite, and the next circuit receives electricity fiI,
flows, both ends of variable rear cooler 220 and high voltage transformer @22
VL-Z c・l.

VT-Z,・l.

occurs.

The current X1 is controlled by the firing phase angle of the KONAI RISTOR 210, and the voltage V between C-0 is ■, = vL 10v? ], variable 97 tata 270 magnitude and V, 0 waveform 0 gen hilo respectively gssa (A, (to) K as shown, high voltage transformer @18011E@ capacity is set sufficiently large, as shown in 1Ii9■ 5, the phase angle of the thyristor 21 becomes smaller, and #i is applied to the dust collecting electrode 2σ sufficiently.
Can supply current.

I'm glad ^ voltage transformer 230 secondary side voltage gas hiroj
110■), as shown in (2), the variable reactor 73
If the 0 inductance is small, the current is narrow during the time,
Moreover, the peak value is high, resulting in a so-called steep electric curve.

Taking advantage of this characteristic, the occurrence of back ionization can be suppressed by adjusting the variable reactor 21 and passing a 0@ current intermittently for a short time instead of the conventional continuous charging. tx
s) JJ, the high resistance/strike above can be achieved by collecting the dust with a high collection rate.

In this way, the output 114# of the medium IaR meter attached to the outlet of the precipitator is combined with the charge control signal to control the inductance of the variable reactance and the thyristor firing phase angle. can be adjusted to obtain a desired 110 dust collection efficiency with less power consumption.

In the embodiments described above, approximately 0.01 to i
Approximately 0 in sO period. By applying a DC high voltage with the arm width of O1 to 1 and cutting off the current before the dust generates a reverse electric layer, the dust with high resistivity can be reduced to zero sintering efficiency. It's cloudy because of things.

In the above embodiment, the case where the present invention is applied to an intermittent charging method has been described, but the present invention 0@1 embodiment 4
It goes without saying that the present invention is not limited to the above, and may be applied to, for example, a continuous charging method, and may also be applied to the electrostatic precipitator 41 in which the continuous charging method and the intermittent charging method are appropriately switched.

In short, according to the present invention, the primary side commercial station power source is converted to a secondary side DC high voltage through current control elements such as transformers and thyristors, and this is applied to the dust collecting electrode to collect dust. The dust collection efficiency and power consumption can be improved by inserting a voltage regulator or a variable voltage regulator into the downstream side of the electrostatic precipitator K and controlling the output waveform of the secondary side. This book is extremely useful for the IjI Hiromaru business, since it is a good idea to get a No. 8 electrostatic precipitator.

This drawing is a circuit diagram showing an electrostatic precipitator using a charging method. In each ll5O output waveform diagram, (4) shows that the output voltage of the voltage regulator is relatively small i.
Figures 6314 and 1145 are diagrams respectively showing the dust collection efficiency and power consumption according to the first embodiment. Pro showing 0aI2 example,
Figure 6 (4), 迤) are the voltage and current waveform diagrams of Figure 6, respectively.
2) When the beam ac I is relatively large, φ) in the figure shows the case where the reactor is relatively small.

Diagram showing the relationship between the secondary voltage and secondary current of an O^ voltage transformer, Fig. 10 (4), 俤)Hiro Each secondary current when the primary voltage is 10 Hs O In the shape diagram, the same w
A(2) is Oka 11@a9 when Reata I is relatively large.
The cases where the atata is relatively small are shown respectively.

1...Slider, 8D% 2...Thyristor, S
.../4 Lux generator, 4-...High voltage transformer MT1j
...@Flowing Actor, #-11111% F-... Collection electrode EP.

11... Zuiristar, 22-... Variable reactor ＼ 2
J...Mushi pressure transformation-114"-!111m, J J.
・・Sirisk control ■Route, 1#-electrostatic precipitator, 21・・
・Dust purity needle, Za-...Reactor control circuit, α...
Ignition (phase) angle, L-・Conduction angle, #4...Electrical resistivity of dust, L...Inductance of variable reactor Applicant Fukudai Weirjin Ben 1st Master Suzue Takeshi Satsuma 1113 Diagram (A) ) (B) lL, zJL″′″″ in Figure 5-5ffl^β”

Claims (1)

[Claims] - Convert the next commercial frequency power supply to a secondary voltage through a current control element such as a transformer or thyristor,
Apply this to the dust collecting electrode and collect the dust using a good electrostatic precipitator Kj? 4111. An electrostatic precipitator comprising: inserting a voltage regulator or a variable reactor I on the secondary side, and controlling the output waveform on the secondary side thereby.