RU1775353C - Air ozonization method - Google Patents

Abstract

Usage: agriculture, food and chemical industry. SUMMARY OF THE INVENTION: the method includes supplying air to the interelectrode space, exposing it to an electric pulse discharge with a voltage amplitude of 10-300 kV, duration

Description

The invention relates to the field of producing ozone in an air or gas environment and can be applied as a method for ozone treatment in various fields of the national economy, in particular in agricultural, food and chemical industry technologies.

The aim of the invention is to reduce the energy consumption of the ozone formation process in air or gas.

Figure 1 shows a diagram of a discharge element with an electrode coated with a layer of solid dielectric: figure 2 is a graph

electric discharge impact on air in the interelectrode space.

The method includes the following operations:

electrodes are installed, the inner surface of one of which is coated with a solid dielectric layer and equidistant from the surface of the other electrode;

supply air to the interelectrode space;

the positive potential of the initiating pulse is supplied to an electrode coated with a dielectric layer with a value providing reliable breakdown of the air gap;

after the initiating pulse ceases, a harmonic sinusoidal voltage of less than the breakdown voltage of the air gap is applied to the electrode;

after some time associated with the frequency of exposure, the sinusoidal voltage is removed and the cyclic effect (steps 3, 4 and 5) is repeated again.

Additionally, to improve the ozone formation process, a positive polarity bias voltage is applied to the electrode coated with a dielectric layer.

PRI me R. The air flow passed in the gap between the electrode 2 and the dielectric gasket 3 (Fig. 1) deposited on the surface of the electrode 1 is electrically discharged from a cyclic voltage source 4.

Based on the requirements of the discharge throughput through the air, the size of the air gap is selected, for example, equal to 0.01 m. The voltage of the initiating pulse is taken to be 60 kV from the condition of reliable breakdown of the air gap. The thickness and material of the dielectric deposited on the electrode 1 is selected from the condition of electric strength of 0.002 m, radio ceramics.

The exposure begins with a 60 kV initiating pulse applied by positive polarity (electrode 1, duration 3 s, and voltage rise rate of 6 10 kB / s.

In this case, the energy of the leading edge of the pulse with small losses in the dielectric is transformed to the interelectrode space. The electric field in the air gap increases until the start of the gas breakdown, after which additional incoming energy is used to form and develop avalanche processes in the gas, which, due to the properties of the dielectric charge, are dispersed throughout the air gap. 1, a lot of micro-avalanches, starting their path from the surface of the electrode 2 due to emission and acceleration of electrons, penetrate the gas volume of the interelectrode space, end their path on the surface of the dielectric 3. In this case, a positive air volume charge forms in the air layer, and negative on the surface of the dielectric 3 charge due to, Ei mainly, free electrons der microlavins,

This process from the first act of exposure is accompanied by intense ozio formation and ends with a sharp drop in the field strength in the interelectrode space due to equalization of potentials on the surfaces of the electrodes

regardless of the potential present on the electrodes (within the recombination time of the bulk charge).

After the termination of the initiating pulse, the voltage source

generates an alternating harmonic voltage with an amplitude of 15 kV and a frequency of 30 kHz, as well as a positive voltage of 0.5 kV applied to electrode 1. In this case, as is known, the minimum breakdown voltage of an air gap of 0.01 m is about 20 kV

The alternating component of the electric field creates increased energy in the interelectrode space

the recombination levels of bulk charges with intense optical radiation in the range of 290-400 Nm are predominantly at the surface of the dielectric, which contributes to the process of ozone formation with the rational use of charge energy.

Under the action of the constant component of the electric current, the ordered movement of electric charges occurs, as a result of which the recombination processes occur more intensively in the zone of the predominant location of negative charges (near the surface of the dielectric) and helps to reduce energy consumption.

The cycle ends after 3 s, the value of which is determined from the conditions of the selected interelectrode air distance, field strength and harmonic frequency

component.

Claims (2)

SUMMARY OF THE INVENTION 1. A method of ozonation of air, comprising supplying air to the interelectrode space, exposure to it by an electric pulse discharge with a voltage amplitude of 10-300 kV, a duration of (1.2-10.0) 10 s, a voltage rise rate of 3 10 k8 / s, different the fact that, in order to reduce energy consumption, the surface of one of the electrodes in the interelectrode space is covered with a layer of solid dielectric, initiating pulse, the positive potential of which is supplied to the electrode coated with a dielectric layer, and an alternating harmonic voltage with an amplitude of not more than 0.9 of the amplitude of the initiating pulse and a frequency of 5-1000 KHZ, the effect is || M1 / pmiip g popmpppm 9, cyclically with a period of 2 -10 -6 -10 s. 2. The method according to claim 1. about l and ch and yshch and with that. that a voltage of positive polarity up to 1 kV is applied to an electrode coated with a dielectric layer, simultaneously with applying an alternating voltage.