RU2273601C2 - Method of production of ozone - Google Patents

Abstract

FIELD: mechanical engineering; production of ozone generators.

SUBSTANCE: the invention is pertaining to the method of production of ozone from the open air. The method provides for feeding of the working gas into the discharge zone of the ozone generator operating on the atmospheric air at the high power density per a unit of the active surface of the welding rods. At the power density exceeding 80 W/dm² extract a part of the air from the air feeding system, dress it with oxygen and feed to the inlet of the ozone generator. At that the oxygen content in the air being fed into the ozone generator is increasing and makes the value of up to 30 %. The offered invention allows to increase productivity of the ozone generator, concentration of the ozone, and also to reduce power input for its production.

EFFECT: the invention ensures the increased productivity of the ozone generator, the raised concentration of the ozone, and reduced power input for its production.

6 dwg

Description

The present invention relates to the production of ozone from atmospheric air in ozone generators using an electric discharge for this purpose.

Known methods for producing ozone, when ozone is synthesized in the gap between the electrodes of the ozone generator, in which an electrical discharge is initiated. Moreover, the performance of the ozone generator and its other characteristics substantially depend on the intensity of heat removal from the discharge gap.

Known methods for producing ozone during forced cooling with a coolant, for example water, of only one (grounded) electrode / 1 / or simultaneously two (high voltage and grounded) electrodes / 2 /.

The objective of the invention is to increase the productivity of the ozone generator, the concentration of ozone and the reduction of energy consumption for its production.

The solution closest to the proposed method is a method for producing ozone / 3 /, in which an increase in the efficiency of ozone generation is achieved by taking part of the working gas from the output of the ozone generator, cooling it in a stand-alone refrigerator and re-supplying the ozone generator to the input.

The disadvantages of this method are: the presence of an additional refrigerator and the presence of an ejector at the entrance to the ozone generator, which requires increased air pressure. At the same time, when using air as a working gas at large values of the power density per unit active electrode surface (more than 80 W / dm ² ), this method does not ensure the effective operation of the ozonizer due to the transition of the avalanche-streamer discharge into a spark, at which the intensity ozone generation is sharply reduced.

The objective of the invention is to increase operating efficiency (increasing productivity and ozone concentration, reducing energy consumption) of ozone generators operating at high power density (more than 80 W / dm ² ).

This goal is achieved by the fact that in the method of producing ozone by supplying a working gas to the discharge zone of an ozone generator operating in atmospheric air at a high power density per unit active electrode surface, it is new that with a power density of more than 80 W / dm ² from the system part of the air is taken off, enriched with oxygen and fed to the input of the ozone generator. In this case, the oxygen content in the air supplied to the ozone generator increases and amounts to 30%.

Figure 1, 2, 4, 5, 6 show specific examples that implement the proposed method. The installation shown in figure 1, operates as follows: atmospheric air in the amount of 170% of the working quantity supplied to the ozone generator 3, is compressed by the compressor 1 to a pressure of 0.7 MPa and is supplied in an amount of 115% to the drying unit 2 and in quantity 55% - to the gas separation unit 4. From the drying unit 2, 20% of the air used to regenerate the adsorbers is discharged into the atmosphere, and 95% is supplied to the ozone generator 3. From the gas separation unit 4, 50% of the air enriched with nitrogen is discharged into the atmosphere, and 5% oxygen with concentration not less than 92% is supplied to ozone generator 3. After the ozone generator, operating at a power density above 80 W / dm ^{2 of the} active surface of the electrodes, we obtain 130% O ₃ / h with an ozone concentration of 26 g O ₃ / m ³ .

If without changing the power supplied to the ozone generator to maintain the ozone concentration at the level of 20 g O ₃ / m ³ , it is necessary to increase the amount of processed air from 170 to 236% (figure 2) and the productivity in this case will increase to 140%.

Figure 3 shows the existing scheme for the installation of ozone, working as follows: atmospheric air in the amount of 120% is supplied by compressor 1 to the drying unit 2, in which 20% of the air is used for regeneration, and the remaining 100% is supplied to the ozone generator 3, in which 100% ozone is produced per hour at a concentration of 20 g O ₃ / m ³ . In this case, the power supplied to the ozone generators is the same for all three cases (Figs. 1, 2, 3).

Thus, the proposed method allows to increase productivity by 30% when working according to the scheme shown in figure 1, and by 40% - when working according to the scheme of figure 2. The increase in the cost of equipment and operating costs for the production of an additional 40% of ozone will be 2.5-4 times lower than the increase in cost if the same amount of ozone is produced according to the existing scheme (figure 3).

If the air drying unit 2 operates at low pressure (0.2 MPa), then the air is taken out using a booster compressor 5 (Figs. 4, 5) or a compressor that selects atmospheric air (Fig. 6).

With an increase in oxygen addition above 10% (total oxygen content of about 31%), the difference in equipment costs and operating costs when producing ozone according to the existing and proposed schemes quickly decreases and the benefits of this method of solving the problem disappear.

Information sources

1. Filippov Yu.V., Voblikova V.A. and other Electrosynthesis of ozone. - M.: Moscow State University, 1987, p. 51-5.

2. RF patent No. 2046753, Cl. From 01 to 13/11, publ. 10.27.95, BI No. 30.

3. RF patent No. 2120404, Cl. From 01 to 13/11, publ. 10.20.98, BI No. 29 (prototype).

Claims (1)

A method of producing ozone by supplying a working gas to the discharge zone of an ozone generator operating in atmospheric air at a high power density per unit active electrode surface, characterized in that at a power density of more than 80 W / dm ^2, part of the air is taken from the air supply system, enriched with oxygen and fed to the input of the ozone generator, while the oxygen content in the air supplied to the ozone generator increases and amounts to 30%.

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