SU1600005A1 - Method of aerodynamic static control - Google Patents

Abstract

The invention relates to the neutralization of electrostatic charges in industrial processes occurring in installations with an intense mechanical effect. The purpose of the invention is to increase the efficiency of neutralization by increasing the range of motion of the gas medium, reducing the gas flow rate and concentration of ions in the gas stream. The method consists in supplying the ionized gas to the neutralization object in the form of vortex rings created by the generator.

Description

The invention relates to the neutralization of electrostatic charges and can be used in the development of neutralizers (ionizers) of static electricity in industrial processes occurring in installations with intense mechanical effects: mixers, fluid bed apparatus dispersed material, crushers, mills, as well as in apparatus drying and transporting solid, liquid and gaseous media (materials) moving at high speeds. In particular, it can be used to localize or remove static charge on dielectric surfaces, in bulk-charged volumes, on conveyor belts in the production of powdered materials. in order to prevent adhesion, electrical breakdown in flammable media, aging and destruction of parts of me-.

kanizm made of dielectric materials.

The aim of the invention is to increase the neutralization efficiency by increasing the range of motion of the gas medium, reducing the gas flow rate and the concentration of ions in the gas stream,

The drawing shows a diagram of the device for the implementation of the proposed method.

The device contains a vortex ring generator, which includes chamber 1, drummer 2, periodically striking the elastic bottom 3 of chamber 1, corona discharge 4 dp of ion generation, mounted directly in working chamber 1 on isolator 5, rectifier (constant voltage source wives) .6.

Dp of setting the device at the corner of the arrester 4 from the rectifier 6 is supplied with a high voltage of the corresponding magnitude and the determined frequency is set to the striker 2, which is made on the basis of a small motor or solenoid 7 controlled by a time relay.

Periodic impact of the striker 2 on the membrane 3 of the generator leads to a pulsed flow from the chamber 1

16000054

pts 3 10 C residual surface charge, measured with voltmeter1-IJ

ra, was Q - 2 ,. At that, the flow rate of the transport gas is W 7.5 X 10 m, the flow rate of the ionic medium when the discharge device is operating in the specified mode is 2x10 ions / min.

Example 2. When exposed

ionized gas flow in the form of charged rings from a distance of

de vortex rings 8, which captured ions and were directed to a discharged (neutralizable) surface 9. Thanks to I the presence of an electric field in places

3 X

0.35 m initial charge O.,

f after t 2,0 min falls to Q 7 x

X, while S 77%. The flow rate of transport gas is 10 cm, ions localization of excess charge ions from | 5 3x10. When neutralizing the charge of a woman20

the volumes of the approaching vortex ring 8 are adsorbed on the charged surface 9 and the electric charge arising on it is removed (screened),

Example 1. On an inclined dielectric surface (zkelob) S (0.05x0.08) m, which is used for periodic dumping into the bunker portions of fine powder with an average size of fractions: 5 15-200 µm for C 120 s, electrostatic charge Q occurs.

Repeated repetition of material dumping along the chute increases the charge on it to Q 1, which is often

25

thirty

The same jet for the same discharge efficiency () consumes 750 cm of transport gas and 7.5 X. 10 ions at the same time.

The most effective is the ratio of the length of the chamber to the diameter of the outlet orifice 1.5 L / D 2.5, at which almost completely expelled is ejected; by guviem on the membrane, the jet participates in the formation of the vortex ring.

Thus, the advantages of the proposed method in comparison with the prototype are that, in order to achieve this goal, it permits a reduction in the flow rate of the transport gas, the flow rate of ions 75-100 times and allows to increase the range of the gas jet 2.3-3-3 times.

thirty

Thus, the advantages of the proposed method in comparison with the prototype are that, in order to achieve this goal, it permits a reduction in the flow rate of the transport gas, the flow rate of ions 75-100 times and allows to increase the range of the gas jet 2.3-3-3 times.

leads to the appearance of a discharge between the surface and particles of the next bulk portion.

Claims (2)

To neutralize the accumulating on the working surface of the chute electro-; static charge has been received the following- 35 Formula izobr.teni in a distance of 0.35 m from: it installed a generator of vortex rings and created an ionic medium of opposite sign in the chamber by im-, pulsed corona with maxi-object ions introduced into the motive current of the corona current μA. Then from to the specified object gaseous medium on the working surface impulsively characterized in that, with The goal is to increase the neutralization efficiency by increasing the long-range method of aerodynamic neutralization of static electricity charges by acting on the charged Equated charged vortex rings with a diameter of D. 0.05 m with a frequency 20 rings / min. The charge of one ring in the motion of a gas medium, reducing this, was q,. After exposure to 1 a vortex rings for 120 s on the electrified surface of the chute with an initial charge the gas flow rate and the concentration of ions in the gas flow, the latter is formulated in the form of vortex rings, one after the other. 1-IJ ra, was Q - 2 ,. At that, the flow rate of the transport gas is W 7.5 X 10 m, the flow rate of the ionic medium when the discharge device is operating in the specified mode is 2x10 ions / min. Example 2. When exposed charged rings from a distance 3 X 0.35 m initial charge O., f after t 2,0 min falls to Q 7 x X, while S 77%. Consumption of transport gas 10 cm, 3x10 ions. When neutralizing charges The same jet for the same discharge efficiency () consumes 750 cm of transport gas and 7.5 X. 10 ions at the same time. The most effective is the ratio of the length of the chamber to the diameter of the outlet orifice 1.5 L / D 2.5, at which almost completely expelled is ejected; by guviem on the membrane, the jet participates in the formation of the vortex ring. Thus, the advantages of the proposed method in comparison with the prototype are that, in order to achieve this goal, it permits a reduction in the flow rate of the transport gas, the flow rate of ions 75-100 times and allows to increase the range of the gas jet 2.3-3-3 times. Formula IZ  .. A method of aerodynamic neutralization of static electricity charges by acting on charged the movement of the gas environment, reducing the gas flow rate and the concentration of ions in the gas flow, the latter is formulated in the form of vortex rings, one after the other.