RU2656970C2 - Method of increasing electrical wind speed - Google Patents

Abstract

FIELD: instrument engineering.

SUBSTANCE: method and device for increasing the speed of electric wind refer to the field of creating gas flows and can be used in purging systems, ventilation systems, systems of air cleaning from dust, bacterial and chemical pollution in industrial premises, as well as in air ozonation systems. Method for increasing the speed of electric wind is to apply a high voltage to the corona and precipitating electrodes, arranged in rows parallel to the gas flow. Ions, after the precipitating electrodes, are directed to the accelerator space, which is located behind the precipitating electrodes. For this, additional electrodes are installed after the precipitating electrodes, which are located opposite the precipitating electrodes, in parallel with them, while they are supplied with a voltage that is accelerating for the ions.

EFFECT: method and device can be used in purging systems, ventilation systems, systems of air cleaning from dust, bacterial and chemical pollution in industrial premises, as well as in air ozonation systems.

1 cl, 3 dwg

Description

A method of increasing the speed of electric wind relates to the field of creating gas flows and can be used in purge, ventilation, air purification from dust, bacterial and chemical contaminants in industrial premises, as well as air ozonation.

Known fan-ozonizer, including a housing, inside which there are several rows of plate electrodes made in aerodynamically profiled form with attached tip emitters [1].

The disadvantages of this device are the complex design of the electrodes, made in an aerodynamically profiled form, where rod pointed emitters are attached to the pointed edge of each plate, and a low air velocity (not more than 1.08 m / s).

A device for air ventilation is known, containing corona and precipitation electrodes located parallel to the gas flow, one side of the corona electrode is corona in the direction of air flow, while the precipitation electrodes are made in the form of continuous plates [2].

The disadvantages of this device are the large power consumption, large mass and high cost, because Precipitation electrodes are made of continuous plates. The device has a low efficiency, which is due to the location of the corona electrodes between the solid precipitation electrodes.

The closest in technical essence and the achieved effect is a method of increasing the speed of an electric wind and a device for its implementation, containing electrodes with emitters arranged in rows parallel to the gas flow, the gas flow accelerated in the space between the first main corona and the first sedimentation corona electrodes is directed into the space between the first precipitation corona and the second main corona electrodes, then the second corona and the second corona uyuschim electrodes etc. [3].

The disadvantages of this method are the relatively low speed of the electric wind (for a 5-cascade electrode system of not more than 3.2 m / s), low efficiency, because In this device, both negative and positive corona discharge are used, therefore, some of the ions formed in the first gap and flying beyond it fall into the braking field of the next interelectrode gap and form a counter flow, which reduces the total speed of the electric wind.

The main technical result of the proposed method is to increase the speed of the electric wind and increase the efficiency.

The technical result is achieved by the fact that the method of increasing the speed of the electric wind is to supply high voltage to the corona and precipitation electrodes located in rows parallel to the gas flow, the ions after the precipitation electrodes are sent to the accelerator space, which is located behind the precipitation electrodes. To do this, after the precipitation electrodes, additional electrodes are installed, which are located opposite the precipitation electrodes, parallel to them, while they are supplied with a voltage that is accelerating for ions.

In FIG. 1 schematically shows the electrode system of a two-row device created by a method of increasing the speed of an electric wind, and a diagram of connecting electrodes to a power source, where 1 is a corona electrode, the arrow indicates the corona side; 2 - precipitation electrodes; 3 - accelerating electrodes. In FIG. Figure 2 shows the experimental data of the dependence of the average air velocity at the outlet on the power consumption for a single-row device without accelerating electrodes and a single-row device with accelerating electrodes at the output for different values of the voltage on the corona electrode U1 <U2 <U3. In FIG. Figure 3 shows the experimental data of the dependence of the efficiency on the power consumption for a single-row device without accelerating electrodes and a single-row device with accelerating electrodes at the output for different values of the voltage on the corona electrode U1 <U2 <U3.

In the device, the corona electrodes 1 are arranged in rows parallel to the air flow, thereby reducing the resistance to air flow (Fig. 1). In parallel to the precipitation electrodes 2 , accelerating electrodes 3 are installed at a fixed distance L2 . This arrangement of accelerating electrodes allows you to create a more uniform distribution of the electric field in the second gap and reduce the resistance to gas flow.

The device can be scaled: an increase in the number of rows allows the output to increase the area of the output window, which increases the productivity of the device. In this case, the upper precipitation and accelerating electrodes of the first row are the lower precipitation and accelerating electrodes for the second row, etc. (Fig. 1). This saves the material from which the electrodes are made.

The device operates as follows. The negative pole is connected to the corona electrodes, and the positive pole of the high voltage source is connected to the accelerating electrodes. Precipitation electrodes are grounded and are at zero potential. When a high voltage is applied to the tips of the corona electrode, a negative corona discharge is ignited. The ions formed in the discharge, under the influence of an electric field, begin to accelerate along the lines of force towards the precipitation electrodes. When moving, ions collide with neutral air molecules, involving them in directional motion. As a result of collisions, a pulse is transferred from ions accelerated in an electric field to neutral air molecules and the speed of directional motion propagates to neighboring parts of the volume.

Some of the negative ions, together with neutral gas molecules, fly beyond the boundaries of the precipitation electrodes, where they again find themselves in an accelerating field, because the accelerating electrode is at a positive potential.

In the proposed method to increase the speed of the electric wind, the use of accelerating space can significantly increase the efficiency compared to the prototype. This is achieved due to the fact that in the accelerating gap L2 there is no cost for organizing an electric discharge in a gas, energy is expended only in moving ions and, accordingly, neutral gas molecules.

The distance L2 is selected from the condition of electric strength for a given maximum voltage value on the accelerating electrode. The greater the field strength in the accelerating gap L2 , the higher the ion velocity: υ _i = μ _i E, where μ _i is the mobility of the ions, E is the electric field strength and, accordingly, the speed of the air flow.

From the experimental dependences of FIG. 2 it can be seen that the speed of the air flow at the outlet of the device using accelerating electrodes is greater than in the same installation without accelerating electrodes at the same power consumption. The increase in air velocity for a device with accelerating electrodes occurs due to an increase in positive voltage. The increase in speed occurs both in the region of the initial working stresses of the negative corona (voltage U1) and in the pre-breakdown region of the corona discharge (voltage U3). In the proposed device, it is possible to obtain air flow velocities of more than 4 m / s using only one corona electrode, while in the prototype the maximum speed for a 5-stage electrode system is 3.2 m / s.

In the experimental dependences of the efficiency on the power consumption shown in FIG. 3, a significant advantage of 2 ÷ 3.5 times is seen when using accelerating electrodes. The efficiency also increases with increasing positive voltage across the accelerating electrodes, over the entire working voltage range for negative corona discharge.

Accelerating electrodes can be installed at the output of multi-stage electrode systems, parallel to the precipitation electrodes, which will also increase the output speed of the electric wind, provided that the magnitude and potential of the voltage on them are accelerating for the ions.

Bibliography

1. Patent No. 2111115 C1, cl. F24F 3/16.

2. Patent No. 2492394 C2, cl. F24F 3/00.

3. Patent No. 2313732 C2, class. F24F 3/16.

Claims (1)

A method of increasing the electric wind speed, which consists in applying a high voltage to the corona and precipitation electrodes arranged in rows parallel to the gas flow, characterized in that the ions after the precipitation electrodes are directed into the accelerator space, which is located behind the precipitation electrodes, for this, additional electrodes are installed after the precipitation electrodes , which are located opposite the precipitation electrodes, parallel to them, while they are supplied with a voltage that is accelerating for ions.

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