RU2333040C1 - Electric precipitator - Google Patents

Abstract

FIELD: electricity; engines and pumps.

SUBSTANCE: electric precipitator includes body, power supply unit, precipitation and corona-forming electrodes, current contact jaw, resistor, condenser and connective bus. The condenser is connected to the precipitation electrodes through the body, and to the corona-forming electrodes through the resistor and current contact jaw. And the negative pole of the power supply unit is connected between the resistor and the condenser, and its positive pole is connected to the body of the electric precipitator. Ratio between the total geometric capacity of the electrode system of the precipitator with the condenser capacity and the area of precipitation electrodes, to which the condenser is connected, is (10^-2-10^-4) mcF\m² that makes tension on electrodes close to stable. Resistor's value is (50-5000) Ohm. The electric charge trickling from the condenser to geometric capacity of the electrodes is faster than from a corona-forming electrode to an interspace, and the condenser determiner the increase of average tension on the electrodes.

EFFECT: increase of gases purification degree at guaranteeing high reliability of the electric precipitator and without a considerable increase of its price.

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Description

The invention relates to the field of electrical gas purification in various industries.

Known electrostatic precipitator, including a housing, current lead, power unit, precipitation and corona electrodes [1].

The disadvantages of this equipment include an insufficient degree of dust purification of the second group due to large ripple voltage and, accordingly, low average voltage.

A known design of an electrostatic precipitator [2], in which to increase the degree of purification, a high-frequency power supply unit with a frequency of rectified current instead of 50 Hz is used up to 10-15 kHz. Medium voltages will be maximum, but this unit is several times more expensive than a conventional unit with power from 50 Hz and due to the complexity of the unit reliability is reduced.

The technical task of the claimed invention and achievable when solving it, the technical and economic result is to achieve an increased degree of purification and reliability of the electrostatic precipitator without a significant increase in cost.

The specified technical result is achieved by the fact that the electrostatic precipitator contains a housing, a power supply unit, a current lead, precipitation and corona electrodes, a capacitor is connected to the precipitation electrodes through a housing, and a capacitor is connected to the corona electrodes through a resistor and current lead, and a plus is connected between the capacitor and the resistor - to the housing of the electrostatic precipitator. The ratio of the total geometric capacitance of the electrode system and the capacitance of the capacitor to the area of the precipitation electrodes to which the capacitor is connected is (10 ^-2 -10 ^-4 ) μf / m ² , and the resistor is made of (50-5000) Ohm. A resistor can also be connected between the capacitor and the electrostatic filter housing.

These features are significant and interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result.

The possibility of carrying out the invention, characterized by the above set of features, as well as the possibility of realizing the purpose of the invention can be confirmed by the description of a possible design of the device performed in accordance with the invention, the essence of which is illustrated by graphic materials.

Figure 1 shows a schematic drawing of the proposed electrostatic precipitator.

Figure 2 shows a diagram of the electrical connections in the proposed electrostatic precipitator.

The proposed electrostatic precipitator includes a housing 1, a power unit 2, precipitation electrodes 3, corona electrodes 4, a current lead 5, a resistor 6, a capacitor 7, a connecting bus 8.

When applying the voltage of FIG. 2 from the power supply unit 2 to the corona electrodes 4 through the current lead 5 (without resistor 6 and capacitor 7), the geometric capacitance of the electrostatic precipitator (not shown in FIGS. 1 and 2) between the corona and precipitation electrodes is not enough to smooth out the voltage ripples on corona electrodes 4. The degree of purification of the electrostatic precipitator is defined as

η = e ^-w

where w is the particle drift velocity to the precipitation electrode 4;

f is a parameter characterizing the geometry of the electrostatic precipitator and the gas velocity in it.

W = K · E _CP E _M = U _CP · U _A ,

where U _A is the amplitude of the voltage at the electrodes 3, 4, is determined by the level of breakdown voltage between the corona 4 and precipitation 3 electrodes;

U _cp is the average voltage at the electrodes 3, 4, determined by the characteristic of the gap between the electrodes 3, 4 and the charge accumulated on the geometrical capacity of the electrostatic precipitator, which goes into dead time when the power supply 2 is disconnected from the electrostatic precipitator by a rectifier bridge (in figures 1, 2 not shown and located inside the power supply 2), in intervals. The more charge can be accumulated on the electrodes, the longer it flows into the gap between the electrodes 3, 4, the less the voltage ripple on the electrodes 3, 4, the greater U _cp , respectively, the greater the drift speed W, the higher the degree of cleaning of the electrostatic precipitator η.

The charge on the corona electrodes 4 can be increased by increasing their area, but this will lead to an increase in metal consumption, price, weight, corona electrodes 4. Connecting the capacitor 7 to the corona electrodes 4 with current lead 5 through a resistor 6, the value of which is 50-5000 Ohms, the charge is drained from the capacitor 7 to the geometric capacity of the electrodes 3, 4 faster than from the corona electrode 4 into the gap and the capacitor 7 determines the increase in the average voltage at the electrodes 3, 4. The ratio of the total geometric capacity of the electrodes 3, 4, which I is determined by direct measurement on the electrostatic precipitator, and the capacitance of the capacitor 7 to the deposition area, defined as the product of the length of the precipitating 3 electrodes a and the height b (see Fig. 1) and (2n-1), where n is the number of precipitating electrodes 3, in in the range (10 ^-2 -10 ^-4 ) μF / m ^{2 it is} enough that the voltage at the electrodes 3, 4 is close to constant (ripple up to 5% of the voltage amplitude). Larger values of the range relate to small areas of deposition (practically from 300 m ² and higher), smaller values relate to large areas of deposition connected to a single power unit 4, up to 5000 m ² and more.

The resistance of the resistor of 50 Ohms refers to the case of supplying large areas of deposition of 5000 m ² , and 5000 Ohms to the case of power from the unit 4 of the deposition area of about 300 m ² .

The capacitance of the capacitor 7 for supplying a large deposition area of up to 5000 m ^{2 is} greatest, with an electrical breakdown between the electrodes 3, 4, a resistor 6 with a resistance of 50 Ohms is sufficient to limit the amplitude of the discharge current of the capacitance of the capacitor 7 to ensure reliable operation of the electrodes 3, 4 and capacitor 7.

The capacitance of capacitor 7 for supplying a small deposition area of up to 300 m ^{2 is} minimum, and the resistance of resistor 6 of 5000 Ohms is also sufficient to ensure reliable operation of the electrostatic precipitator.

This design of the electrostatic precipitator allows to increase the degree of purification of the electrostatic precipitator while ensuring high reliability and without a significant increase in the price of the electrostatic precipitator.

The present invention is industrially applicable, since its manufacture does not require special equipment and new technology.

The design of the device "electrostatic precipitator" described in this example and depicted in graphic materials is not the only one possible to achieve the above technical result and does not exclude other variants of its manufacture containing a combination of features included in an independent claim.

Literature

1. Gas purification equipment. Catalog. Tsintihimneftemash, M., 1988, pp. 4-7.

2. Translators V.I., Scherbakov A.V., Gusev S.I. et al. Unipolar high-voltage source with high-frequency coupling for powering electrostatic filters / Jubilee Proceedings of VEI on the 85th Anniversary, 2006, pp. 189-195.

Claims (1)

An electrostatic precipitator including a housing, a power supply unit, a current supply, precipitation and corona electrodes, characterized in that a capacitor is connected to the precipitation electrodes through the housing, and a capacitor is connected to the corona electrodes through a resistor and a current supply, while the power supply is connected between the resistor and the capacitor by a minus and a plus to the housing of the electrostatic precipitator, while the ratio of the total geometric capacity of the electrode system of the electrostatic precipitator and the capacitance of the capacitor to the area of the precipitation electrodes to which the capacitor is connected, tries ditsya in the range 10 ^-2 -10 ^-4 uF / m ^2, and the value of the resistor formed 50-5000 ohms.

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