SU1278033A1 - Method of supplying power to electric precipitator - Google Patents

Abstract

The invention relates to methods for the separation of materials using a corona discharge, can be used in non-ferrous and ferrous metallurgy, and makes it possible to increase the efficiency of the process of separating solid particles from a gas stream and reduce electrical energy consumption. The corona electrode (EC) of the electrostatic precipitator 3 (E) is supplied with current pulses of negative polarity of a given magnitude J. As a result of the deposition of particles of a deposited material on a collecting electrode (OE), the EC is reduced by an IV. Following the negative, a positive impulse is given of a constant value of duration C where K is the proportionality coefficient. Owing to the accelerated discharge of the settled particles and their removal from the OE, the current of negative polarity increases and at its given value Y, the supply of positive pulses ceases. The method is implemented by a device containing a series of right-angle impulses 1, a current transformer 4, a voltage source 5, a comparison circuit (Reference 6 and a controlled generator 7. 2, 10, 00, 00 00 00)

Description

The invention relates to methods for separating materials using a corona discharge and can be applied to isolate solid dispersed particles of materials with high electrical resistivity in ferrous and nonferrous metallurgy, cement and other industries.

The purpose of the invention is to improve the e () efficiency of the process of separating solid particles from a gas stream and reducing power consumption.

FIG. 1 shows the current pulses applied to the discharge electrode of the electrostatic precipitator; na 2 is a functional diagram of a device that implements the method of nitrating electrostatic precipitators.

The way of insolation; 1 is as follows.

On the corona electrode y; 1ktrofilter serves an imp. Current of negative current; | Rarity of a given value 3. Due to the deposition of particles of the deposited material on the precipitating electrode of the electrostatic precipitator, the current decreases with time by the amount D1. Then follow the negative node and put it down. 1st pulse constant

weights

3

d, literacy

Mr. - (- -

 Kd

-

(coe (() (|) isiept of proportion of palpability K is determined by the costruction and the mode of operation of the electrofi.; 1 r)). In the whole, the accelerated discharge of the axial particles and their removal from the deposited electrode is negative it reaches a predetermined value of 3, but the assignment; 1); 1 of them is repaired, since in this case, section 0. Thus, the current of 1 and, hence, the entire dispersion of solid particles from the gas nozzle is stabilized.

Because the average ditiness of the number of 1o.shits clashes, 1 of the qtness of the S cJ3CO iacno is less than the proposed method, what is known for it, i-de it is equal to the maximum possible (C / iiK; T -, where T is the period of following emulsions), then the average value of the positive charge, which is due to negatively charged material particles to the precipitator electrode of the electrostatic precipitator, is less (3, p.

A device that implements the ipod method includes a rectangular pulse generator 1, an impulse transformer 2, an electrostatic precipitator 3, a current transformer 4, an on-voltage source 5, a comparison circuit 6 and an adjustable generator 7.

The device works as follows.

The generator 1 generates, on the nerve winding of the impulse h raxformator 2, pulses of positive polarity with an amperage of 300 V, d, 1 20 μs and a period of 120 μs. From the second winding of the trans impulse (|) ormator them

ten

15

20

25

thirty

35

40

45

50

55

Negative polarity pulses with a voltage of 25 kV are connected to the corona electrode of the electrostatic precipitator 3. The current amplitude of the negative corona is measured with the frequency of the current transformer 4. A voltage proportional to the current of the corona is removed from the winding of the transformer 4. This voltage in comparison circuit 6 is compared with onorny coming from source voltage 5 of the reference voltage. During the comparison circuit, a signal is generated in the form of a loading pulse and amplitude U. The magnitude of the on-voltage voltage is chosen in such a way that with a corona current equal to a given one, the signal at the output of the comparison circuit would be zero. The nominal coefficient K is introduced into the comparison circuit by setting the gain () 5 for the gain ratio of the differential amplifier and can vary in some limits. The signal from the output of the comparison circuit and the input to the input of the controlled generator of 7 pulses, the duration of the pulse which is normal to the size of the input signal. The output of the generator 7 is connected to the primary winding of the pulse transformer 2, the winding of which is opposite to the winding direction of the first primary winding, and the number of turns is chosen in such a way that it provides for the secondary winding of the pulse transformer and m. positive polarity amnlitudo 8 kV.

If the current of the negative current of the electrostatic precipitator is as specified, there is no signal at the output of the comparison circuit and a positive pulse is sent to the corona electrode. With a decrease in the corona current, at the output of the comparison circuit, a mismatch signal KLL is generated, the value of which determines the duration of the positive current signal impulse on the corona electrode of the electrostatic precipitator.

The coefficient of proionality K is chosen empirically from the condition 0 К ч 37 -м (4

Since k is determined by the parameters of the circuit (selection of parts, change in gain, etc.), its setting can be carried out by various methods.

Claims (1)

The invention relates to methods for separating materials using a corona discharge and can be applied to isolate solid dispersed particles of materials with high electrical resistivity in ferrous and nonferrous metallurgy, cement and other industries. The purpose of the invention is to improve the efficiency of the process of separating solid particles from the gas stream and reducing power consumption. FIG. 1 shows the current pulses applied to the discharge electrode of the electrostatic precipitator; na 2 is a functional diagram of a device that implements the method of nitrating electrostatic precipitators. The way of insolation; 1 is as follows. On the corona electrode y; 1 the filter serves an imp. Current of negative current; | Rarity of a given value 3. Due to the deposition of particles of the deposited material on the precipitating electrode of the electrostatic precipitator, the current decreases with time by the amount D1. Then, following the negative, a positive 1d1 impulse of a constant qd, lithium of the type (coe (() (|) іtsipept noportsiopalposti K is determined by costruction and the mode of operation of the electrofusion;; 1st)) .. After the particles are removed and their removal from the precipitating electrode electrode, the current of negative polarity increases, and when it reaches a predetermined value of 3, but the supply; you live; 1 pulse and is repaired, since in this way the current rushes 1 and, therefore, the entire nropess of a hard hour particles from the gas nozzle. Because the average dt.chit.nost impulses 1o.chizhite, 1nny ts) of the ScJ3CO iacno variability to the proposed method is less than four times known, i-de it is equal to the maximum possible (C / iiK; T- -, where T is the period of following emulsions), then the average value of the positive charge, which causes the movement of negative particles of the material to the precipitator electrode of the electrostatic precipitator, is less (3, p. The device that implements the alternating method contains a heater 1 of rectangular impulses, impulse transformer 2, electrostatic precipitator 3, t 4 ansformator current source 5 onornogo voltage comparing circuit 6 and unravl emy generator 7. The device operates as follows. The generator 1 generates on the nervous winding winding of a pulsator shrapformat.mator 2 impulses of positive polarity with an ampere of 300 V, d, 1 20 microseconds and a period of 120 microsec. From the second winding of the trans ()) ormator pulse, negative-polarity pulses of 25 kV voltage are connected to the discharge electrode of electrostatic precipitator 3. The current amplitude of the negative corona is measured with the voltage of the transformer 4 of the current. A voltage proportional to the current of the corona is removed from the winding of the transformer 4. This voltage in comparison circuit 6 is compared with onorny coming from source voltage 5 of the reference voltage. During the comparison circuit, a signal is generated in the form of a loading pulse and amplitude U. The magnitude of the on-line voltage is chosen in such a way that, with a corona current equal to a given one, the signal at the output of the comparison circuit would be zero. The nominal coefficient K is introduced into the comparison circuit by setting the ratio () of the gain ratio to the differential of the amplifier and may vary in some limits. The signal from the output of the comparison circuit and the input to the input of the controlled generator of 7 pulses, the duration of the pulse which is normal to the size of the input signal. The output of the generator 7 is connected to the primary winding of the pulse transformer 2, the winding of which is opposite to the winding direction of the first primary winding, and the number of turns is chosen in such a way that it provides a positive voltage pulse on the secondary winding of the pulse transformer Rnness amnlitudoy 8 kV. If the current of the negative current of the electrostatic precipitator is as specified, there is no signal at the output of the comparison circuit, and a negative pulse is applied to the corona. With a decrease in the corona current, at the output of the comparison circuit, an LL mismatch signal is generated, the magnitude of which determines the duration of the positive current signal impulse on the corona electrode of the electrostatic precipitator. The coefficient of efficiency K is chosen empirically from 0 Kch37-ma (4 Since k is determined by the parameters of the circuit (selection of details, change of the gain, etc.), its task can be produced by various methods. Formula of the invention by feeding current filter pulses A coarse-shaped form of the modern situation, characterized in that, in order to increase the efficiency of the process of separating solid particles from the gas duct and reducing power consumption, the duration pulses according to the number of electrons, ironornically, the magnitude of the diverter and the current of negative zero from the given value. 7 / ABOUT g / Tf