RU2248319C2 - Electric ozonizer - Google Patents

Abstract

FIELD: production of ozone.

SUBSTANCE: electric ozonizer has a stack of alternating electrode plates connected with the high-voltage AC power source and dielectric barriers arranged in the plane of their symmetry. The additional dielectric barriers are interposed between the barriers. The greater the number of barriers in the gas discharge space, the longer time taken for break-down of all barriers.

EFFECT: prolonged service life and enhanced reliability.

2 dwg

Description

The invention relates to chemical engineering and can be used to ensure the safety of food products, water treatment, disinfection of premises, etc.

A known ozone generator made of flat metal electrodes between which dielectric plates (barriers) are laid and longitudinal rails creating gap discharge gaps through which ozonated gas is passed [1].

The disadvantage of this device is its low resource. In the event of a breakdown of one of the dielectric barriers, a short circuit occurs between the electrodes. The ozone generator must be urgently disconnected from the power source for its repair with the subsequent replacement of the failed dielectric barrier.

You can only turn off the electrodes between which a short circuit has occurred, and continue to operate the ozone generator on the remaining elements. However, the performance of the ozonizer will decrease according to the number of disconnected elements.

The closest technical solution to the proposed device is an ozonizer containing a package of alternating electrode plates located inside dielectric barriers in the plane of their symmetry and connected to a high-voltage source of alternating voltage [2]. Here, two barriers are used to form each discharge gap. When one of them is broken, the second barrier continues to work and the operability of this gas-discharge gap and, accordingly, the ozone generator is extended. However, in the event of a breakdown of the second dielectric barrier in the immediate vicinity of the breakdown zone of the first barrier, a short circuit between the electrodes will occur, which will also lead to either a shutdown of the ozone generator or a decrease in its productivity.

The claimed invention solves the problem of creating an ozonizer with an increased service life and reliable operation of the ozonizer while increasing its productivity. The technical result achieved by using the claimed invention is to increase the productivity of the ozonizer, increase the reliability. This technical result is achieved by the fact that in the ozonizer containing a package of alternating electrode plates connected to a high-voltage source of alternating voltage and located inside dielectric barriers in the plane of their symmetry between the barriers, with additional dielectric barriers located inside the electrode plates.

As a result, the service life of each gas discharge gap is increased. Firstly, the more barriers in the gas-discharge gap, the more time is required for the breakdown of all barriers. Secondly, even with an electrical breakdown of all barriers, a normal mode of operation in the gas-discharge gap is possible. This is true with a sufficient spatial spread of the breakdown points of the barriers. Productivity is also increasing.

Figure 1 shows the ozonizer, figure 2 a section aa in figure 1. The present device relates to plate ozonizers. Obviously, all the benefits will be true for tubular ozonizer. The device is made in the form of a package consisting of alternating and alternating 180 ° electrode plates 1 of one potential and plates 2 of another potential. These plates are located inside the dielectric barriers 3 in the plane of their symmetry. Between the barriers 3 there are continuous dielectric barriers 4 without electrode plates. Between the barriers 3 and 4 placed liners 5, designed to ensure uniformity of the gas gaps 6, which are necessary for the passage of ozonated gas.

The package is assembled between two end shields 7, fastened with pins 8 and nuts 9. To supply power, plates 1 are connected to terminal 10 of one potential of the power source, and plates 2 are connected to terminal 11 of another potential.

Figure 1 shows the case of a device with three gas discharge gaps (two electrodes 1 and two electrodes 2). Each gas discharge gap consists of three air gaps 6, which are formed by two barriers 3 containing electrodes and two continuous barriers 4.

The device operates as follows. When applying electric voltage to the terminals 10 and 11 between the electrode plates 1 and 2, an electric field appears with a barrier discharge in each discharge gap. In turn, the electric field in the discharge gap is evenly distributed over the gaps 6 constituting the gas discharge gap. Ozonated gas is supplied to these gaps 6, where it is ozonized by a barrier discharge.

In laboratory conditions, experimental studies were conducted on the effectiveness of the proposed device. The basis was taken of the classic single-barrier ozonizer and the proposed multi-barrier device.

A classic ozonizer with the following data: two electrodes, a fiberglass barrier 2 mm thick and a gas discharge gap 1.5 mm high. The proposed device has two electrodes, four barriers made of fiberglass (the thickness of each barrier is 0.5 mm) and three gaps, each 0.5 mm high.

Thus, ozonizers had the same number of electrodes equal to two, the same gas discharge gap equal to 1.5 mm, and the same total thickness of the barriers equal to 2 mm. In addition, ozonizers had the same shape and area of gas discharge gaps. When supplying ozonizers from a high-voltage voltage source with a frequency of 50 Hz, the same currents (1 mA) and voltage (11 kV) were maintained.

As a result of many experiments, a single-barrier ozonizer functioned before the breakdown of the barrier from 3 to 10 hours with a productivity of up to 0.3 grams of ozone per hour. The four-barrier ozonizer worked for more than 200 hours and none of the barriers failed. Moreover, the performance of the ozonizer has increased compared with single-barrier to 1.2 grams of ozone per hour.

The increase in productivity of the four-barrier ozonizer is due to two reasons. The main reason: due to multi-barrierness, the number of the most ozone-producing zones of barrier discharge has sharply increased. These include expanded portions of microdischarge channels that are adjacent to the surface of dielectric barriers. The more barriers, the more these zones. The second reason is the better cooling of barriers in a multi-barrier ozonator. Ozonated gas washes each barrier and carries out heat removal from their surfaces. The more barriers, the more efficient the cooling.

Sources of information

1. US patent No. 3801791, CL. 250-532, 1976.

2. USSR copyright certificate No. 941278, cl. C 01 B 13/11, 1982 (prototype).

Claims (1)

An ozonizer containing a stack of alternating electrode plates connected to a high-voltage source of alternating voltage and located inside the dielectric barriers in the plane of their symmetry, characterized in that between the barriers located inside the electrode plates there are additional dielectric barriers.

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