RU2545305C2 - Pulse barrier-free ozone generator - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: pulse barrier-free ozone generator is related to ozone generating systems intended to produce ozone for its usage in water treatment and disinfection technologies. In pulse barrier-free ozone generator comprised of a metal body and electrode system with discharge elements mounted in the above body each of discharge elements consists of low- and high-voltage electrodes connected to high-voltage pulse generator; the body contains two dielectric plates set opposite each other. At one of the above plates there is high-voltage electrode represented as a single-layer winding of non-insulated wire with diameter bigger than distance between the plates, at that winding pitch is at least 2 more than distance of electrical breakdown. Low-voltage electrode is made in similar way and is installed at the other plate. The electrodes are shifted relative to each other per a half of winding pitch.

EFFECT: assembly is characterised by improved efficiency of ozone production, simple design and small dimensions.

2 dwg

Description

The invention relates to the treatment of drinking and wastewater using ozone produced by barrier-free ozonizers.

Known barrier-free ozonizer (AS USSR No. 1465412, publ. March 15, 89 No. 10) with a camera containing an external cylindrical electrode and an internal electrode equipped with discharge disks.

The disadvantages of the device are the relatively low achievable ozone concentration of 4-5 g / m ³ and the relatively large dimensions, especially with multi-chamber performance of the ozonizer.

Also known is barrier-free ozonizer (RF patent No. 2179150, publ. 02/10/2002) with a chamber containing a high-voltage and grounded electrode, made in the form of rings, connected to a pulse generator, and flat ring electrodes coaxially fixed in the interelectrode space, also connected to a pulse generator .

In this device, the achieved concentration is higher than in the previous analogue, only 2-3 times and also there is such a disadvantage as increased dimensions.

The relatively low achieved ozone concentration in the presented analogues is related to the discreteness of ozone synthesis both in time and in the volume of ozonization chambers. Temporal discreteness is due to both the pulse repetition rate and the processes in the corona discharge. The spatial discreteness is due to the design of the electrode systems. In the first analogue, spatial discreteness is caused by the disks of a high-voltage electrode. They are arranged alternately through a certain interval. In the second analogue, spatial discreteness is due to the finite dimensions of the ring electrodes.

In the interval between the acts of ozone synthesis, a significant part of the ozonized gas passes inside the ozonization chamber without being subjected to ozonation, and dilutes ozone. As a result, the ozone concentration decreases at the output.

Closest to the claimed device and selected for the prototype is the ozonizer described in RF patent No. 2220093, publ. 12/27/2003.

A pulsed barrier-free ozonizer comprising a housing and an electrode system located in the housing containing discharge elements, each of which consists of a coaxial external low-voltage electrode and an internal high-voltage electrode connected to a high-voltage pulse generator. Here, the spatial discreteness is much smaller and is mainly due to the inhomogeneity of the electric field. Ozone synthesis is carried out in areas adjacent to the internal high-voltage electrode.

However, as in analogues, the generator consists of separate chambers that are hermetically isolated from each other, which leads to a complication of the design and an increase in dimensions.

The technical result of the claimed invention is to increase the concentration of ozone and the ozone production process, as well as simplifying the design and reducing overall dimensions.

The stated technical problem is solved in that in a pulsed barrier-free ozonizer containing a metal housing and placed in the housing an electrode system containing discharge elements, each of which consists of low-voltage and high-voltage electrodes connected to a high-voltage pulse generator, according to the claimed invention, the housing contains two dielectric plates set against each other. Moreover, on one of the plates there is a high-voltage electrode, which is a single-layer winding of bare wire, the diameter of which is less than the distance between the plates, and the step of the winding is not less than 2 times the distance of electrical breakdown. Similarly, a low-voltage electrode is mounted on another plate, and the electrodes are offset relative to each other by half a step of the winding.

In FIG. 1 is a diagram of a pulsed ozone generator; FIG. 2 - section of the ozonation chamber.

The ozone generator consists of a housing, including two parallel plates 1 and 2, the distance between which Δ = 1-2 cm, separated by gaskets 3, forming an airtight cavity, with nozzles 8 and 9; providing input, synthesis and withdrawal of ozonated gas. On the plates 1 and 2, electrodes are installed in the form of windings made of wire with a diameter d _pp , which is less than the distance "Δ" between the plates 1 and 2 (d _pp <Δ). The electrode 4 is mounted on the plate 1, and the electrode 5 on the plate 2, each of the two electrodes consisting of parallel, evenly spaced uninsulated conductors with a step of "h", and the conductors of the electrodes 4 and 5 are shifted relative to each other by half a step h / 2. That is, the distance between the turns of the two windings is equal to h / 2. Each of the electrodes 4 and 5 has a terminal: an electrode 4 is a terminal 6, and an electrode 5 is a terminal 7. A high-voltage nanosecond generator 10 is connected to the terminals 6 and 7.

The winding pitch "h" of the windings is selected from the condition: the absence of spark breakdown between electrodes 4 and 5 and is determined by the distance between the electrodes "h / 2".

The ozonizer works as follows. Air or oxygen is supplied to the electrode system 4 and 5 through the inlet 8. When 10 voltage pulses are supplied from the high-voltage nanosecond power source to the electrodes 4 and 5, a corona pulse is generated between them to produce ozone. Ozone-enriched ozonized gas is discharged from the discharge chamber through the pipe 9.

In particular, in the laboratory, tests were carried out on the inventive device.

A casing 30 cm long and 20 cm wide was made. The working gap between the two plates was 2 mm (Δ). The electrodes in the form of windings are made of nichrome wire with a diameter of d _pp = 0.5 mm, (d _pp ) <Δ). The distance between the bipolar electrodes was 7 mm. A maximum concentration of 17 g / m ^{3 of} ozone in the dry air was obtained at an air flow rate of 500 liters per hour. At the same oxygen consumption, a concentration of 32 g / m ozone was obtained. Oxygen was supplied from an Armed oxygen concentrator. In this case, the parameters of the power source: pulse front of 20 nanoseconds, pulse amplitude of 20 kilovolts, pulse duration of 500 nanoseconds, pulse repetition rate of 500 hertz

For optimal operation of the device, a high voltage pulse duration of not more than 0.5 μs is formed, and a front duration of not more than 100 ns. The greatest efficiency is achieved with a voltage amplitude close to the beginning of spark breakdown. In this case, the corona discharge has the greatest volume and uniformity in current density and the highest ozone generation efficiency. In the case of a possible rare spark breakdown of the gas gap, the efficiency of ozone production is practically not reduced. The main advantage due to the design of the claimed device is the smallest spatial discreteness. The discharges in the presented design develop on both sides of each electrode (except for the extreme electrodes). Corona discharges practically fill the entire volume of the ozonization chamber. The small size of the wire electrodes does not significantly affect the spatial resolution of the corona discharge. As a result, ozone synthesis is carried out in almost the entire volume of the ozonization chamber, and the concentration is greatest. In addition, the proposed device may contain a camera, consisting of many wire electrodes, and in fact is a multi-chamber design. This leads to a simplification of the device and a decrease in overall dimensions.

Claims (1)

A pulsed barrier-free ozonizer containing a metal housing and an electrode system located in the housing containing discharge elements, each of which consists of a high-voltage and low-voltage electrodes connected to a high-voltage pulse generator, characterized in that the housing contains two dielectric plates mounted against each other, on one of the plates on the side of the other plate has a high-voltage electrode, and a low-voltage electrode is installed similarly on another plate, with each of electrodes is a single layer coil of wire, the diameter of which is smaller than the distance between the plates, wherein the step of winding «h» windings not less than twice the distance of electrical breakdown and the distance between the turns of the two coils is equal to h / 2.

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