TWI476145B - Ozone generator - Google Patents

Description

Ozone generating device

The invention relates to an ozone generating device, in particular to an ozone generating device based on the principle of corona discharge.

Ozone is a strong oxidant. Among the known oxidants, the oxidation of ozone is second only to fluorine. Therefore, it can oxidize water and air pollutants such as bacteria or viruses, and is widely used in water, air and environment. Purification. Especially in the water treatment, the ozone oxidation disinfection effect is several times higher than the conventional chlorinating agent, and there is no secondary pollution.

Ozone is formed in nature by ultraviolet light or lightning strikes oxygen in the air. At present, the methods for artificially generating ozone mainly include electrolysis, ultraviolet light, and corona discharge. Corona discharge is a partial self-sustaining discharge generated by a gas medium in an inhomogeneous electric field generated by a corona voltage. The so-called self-sustaining discharge is a gas discharge phenomenon that can be maintained only by the corona voltage without relying on external ionization conditions. This discharge phenomenon is relatively stable. The ozone generating device manufactured by the corona discharge principle is most widely used in the industry due to high ozone generation efficiency, good controllability, and ability to prepare high concentration ozone.

The ozone generating device generally includes a first electrode and a second electrode disposed oppositely. The first electrode has a plurality of discharge cells near the surface of the second electrode, the discharge cell is a tip or a protrusion, and the second electrode is adjacent to the first electrode. The surface is flat or curved. When an external voltage is applied to the first electrode and the second electrode, a large amount of charges are accumulated at the ends of the respective discharge cells in the first electrode, thereby causing each discharge cell in the first electrode to be placed The space between the electrical units creates an inhomogeneous electric field. When the external voltage reaches the corona voltage, the gas near the tip is ionized and a corona current is generated. The formation process of ozone is mainly divided into three steps: first, the corona current provides free electrons; second, the free electron collides with oxygen molecules in oxygen to generate free oxygen atoms; and third, the oxygen atoms and oxygen molecules are in the middle gas. Under the action of the combination, ozone molecules are formed.

In the ozone generation process, the magnitude of the corona current greatly affects the yield and yield of the ozone, and the larger the corona current, the higher the yield and yield of the ozone. It has been pointed out in the literature that the corona current can be increased by reducing the diameter of the tip of the first electrode at the same voltage. Please refer to the "multi-needle electrode structure bipolar corona discharge voltammetry" published by Chen Haifeng et al. characteristic". In the prior ozone generating apparatus, the discharge unit was generally an elongated metal, and the end of the elongated metal was the discharge end of the discharge unit. However, the characteristics of the metal material are determined by the difficulty in processing the diameter of the elongated metal end to the micron level or even the nano level. Therefore, in the prior ozone generating apparatus, the diameter of the elongated metal end is generally on the order of millimeters, so that the corona current generated by the ozone generating device is small.

In view of this, it is necessary to provide an ozone generating device having a large corona current.

An ozone generating device includes a first electrode and a second electrode disposed at intervals, and the first electrode and the second electrode are at least partially disposed opposite to each other. The ozone generating device is configured to convert oxygen injected between the first and second electrodes into ozone. The first electrode is disposed adjacent to one side of the second electrode with at least one discharge unit, and the discharge unit includes at least one carbon nanotube The wire extends from the first electrode toward the second electrode, and the nanocarbon pipeline extends at least one carbon nanotube near one end of the second electrode.

An ozone generating device includes a first electrode and a second electrode spaced apart from each other, wherein the first electrode and the second electrode are plate electrodes arranged in parallel and spaced apart from each other. The first electrode is spaced apart from one side of the second electrode to be provided with a plurality of discharge cells, and the plurality of discharge cells are arranged in an array. The ozone generating device is configured to convert oxygen injected between the first electrode and the second electrode into ozone. Each of the discharge cells includes at least one nanocarbon line extending from the first electrode toward the second electrode, and the nanocarbon line extends at least one carbon nanotube near one end of the second electrode. The surface of the extended carbon nanotube is provided with a metal carbide layer or a plurality of metal carbide particles.

Compared with the prior art, the present invention provides an ozone generating device, wherein the discharge unit comprises at least one nano carbon line, and the discharge end of the nano carbon line is a carbon nanotube having a diameter of a nanometer, and thus the ozone generating device Has a large corona current.

Hereinafter, an ozone generating apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1 , an ozone generating apparatus 100 according to an embodiment of the present invention includes a first electrode 110 and a second electrode 120 disposed opposite to each other. A dielectric body 130 is disposed adjacent to the second electrode 120. On one side of the first electrode 110, at least one discharge unit 140 is disposed on a side of the first electrode 110 adjacent to the dielectric body 130. The first electrode 110 and the second electrode 120 are electrically connected to a power source 200.

The power source 200 is a DC power source, and has a positive electrode 210 and a negative electrode 220. The positive electrode 210 is electrically connected to the second electrode 120. The negative electrode 220 is electrically connected to the first electrode 110, so that the first electrode 110 has a negative The voltage generates a corona current from the negative voltage. At this time, the first electrode 110 is a negative corona discharge. It can be understood that the connection manner between the power source 200 and the first electrode 110 and the second electrode 120 is not limited to the above connection manner. The anode 220 can also be electrically connected to the second electrode 120, and the cathode 210 is electrically connected to the first electrode 110, so that the first electrode 110 has a positive voltage and generates a corona current from the positive voltage. The first electrode 110 is a positive corona discharge. It can be understood that the power source 200 can also be an AC power source, and the first electrode 110 alternately generates a negative corona discharge and a positive corona discharge.

The first electrode 110 and the second electrode 120 are two plate electrodes arranged in parallel with each other. The first electrode 110 and the second electrode 120 are at least partially opposite each other to ensure that the first electrode 110 and the second electrode 120 are opposite to each other. Some can generate a non-uniform electric field to form a corona current. Of course, the first and second electrodes 110 and 120 can also be two concentric and spaced apart cylindrical electrodes. The first electrode 110 is sleeved in the second electrode 120.

The dielectric body 130 is disposed on a side of the second electrode 120 adjacent to the first electrode 110, and has a certain gap between the dielectric body 130 and the discharge unit 140. The dielectric body 130 is made of ceramic or other heat resistant insulating material, and the dielectric body 130 covers the surface of the second electrode 120 facing the first electrode 110. Therefore, when the voltage between the first electrode 110 and the second electrode 120 is greater than the corona voltage, it is ensured that it is difficult to form a path current between the first electrode 110 and the second electrode 120 to promote corona discharge. effect. The dielectric body 130 can also be an insulator such as glass or plastic. Understandably, the media The electric body 130 is an optional component in the ozone generating device 100. The ozone generating device 100 may not include the dielectric body 130. In this case, the voltage applied to the first electrode 110 should be smaller than the discharging unit 140 to the first. The breakdown voltage of the electrode 120 is such that no path current is formed between the first electrode 110 and the second electrode 120 to ensure that the discharge unit 140 is corona discharge.

The discharge unit 140 is fixed to the first electrode 110 by means of inlay or conductive adhesive bonding. When the discharge cells 140 are plural, the plurality of discharge cells 140 are spaced apart, and preferably, the plurality of discharge cells 140 are arranged in an array. Each of the discharge cells 140 includes at least one nano carbon line extending from the first electrode 110 toward the second electrode 120. The discharge unit 140 may also be arranged side by side or wound into a linear structure by a plurality of carbon nanotubes.

Referring to Figures 2 and 3, the nanocarbon pipeline includes a plurality of carbon nanotubes that are twisted or aligned in an axial direction thereof. The plurality of carbon nanotubes are connected end to end and are arranged substantially along the axial direction of the carbon nanotubes, and the adjacent carbon nanotubes are connected by van der Waals force. The nano carbon line is not limited in length and has a diameter of 0.5 nm to 100 μm. Specifically, the nanocarbon pipeline can be obtained by mechanically twisting or organic solvent treatment of pulling a carbon nanotube film from an array of carbon nanotubes, and twisting it by mechanical force torsion The plurality of carbon nanotubes in the carbon carbon pipeline are arranged in an axial spiral around the nano carbon pipeline. The plurality of carbon nanotubes in the non-twisted nanocarbon line obtained by the organic solvent treatment are arranged substantially in parallel. The nanocarbon pipeline obtained by the organic solvent treatment and the preparation method thereof are disclosed in the US Patent No. US2007/0166223 A1, which was filed on October 26, 2007, to Shou-Shan Fan et al. patent application. In order to save space, only this is cited, but all technical disclosures of this application should also be regarded as the present invention. Apply for a part of the technical disclosure.

The nanocarbon pipeline extends at least one carbon nanotube near the end of the second electrode 120 as a discharge end of the discharge unit 140, and the diameter of the carbon nanotube is 0.4 nm to 50 nm. That is, the diameter of the discharge end reaches the nanometer level. Therefore, the discharge unit 140 including the nanocarbon line has an ozone generating device 100 having a large corona current. At the same time, each nanocarbon line can include a plurality of discharge ends to increase the density of the corona current.

Referring to FIG. 4 and FIG. 5, in the embodiment, the nanocarbon pipeline may have a plurality of tips near one end of the second electrode 120. The tip includes a plurality of carbon nanotubes tightly coupled by Van der Waals force and substantially parallel to each other, and the tip is adjacent to one end of the second electrode 120, that is, a tip of the tip extends toward the second electrode 120 to form a carbon nanotube The carbon nanotube is the discharge end of the nanocarbon pipeline. There is a certain gap between the complex tips to avoid electric field shielding between the respective tips, and the protruding carbon nanotubes are firmly fixed by the other surrounding carbon nanotubes through the van der Waals force, so the protruding carbon nanotubes Can withstand large discharge voltages. The tip can be formed by energizing the nanocarbon line, by laser burning the nanocarbon line, or by scanning the nanocarbon line with an electron beam.

The surface of the discharge unit 140 may further be formed with an ion-resistant metal carbide layer or a plurality of metal carbide particles, and the metal carbide layer or the plurality of metal carbide particles are disposed at least on the surface of the discharge end, preferably, The metal carbide layer or metal carbide particles are disposed on the outer surface of each of the carbon nanotubes in the discharge unit 140. The metal carbide layer or the metal carbide particles can cause the ions generated by the discharge unit 140 to ionize the gas medium during the discharge process without directly impacting the carbon nanotubes, thereby The discharge unit 140 is more resistant to ion shock and prolongs the service life of the discharge unit 140. The metal carbide may be one of tantalum carbide, titanium carbide, tantalum carbide, and zirconium carbide. Preferably, the metal carbide is selected from tantalum carbide.

When the ozone generating device 100 is in operation, when the mixed gas containing oxygen is injected into the gap between the first electrode 110 and the dielectric body 130, the first electrode 110 and the second electrode 120 are supplied with power. The end of the discharge unit 140 collects space charge and enhances the electric field near the tip. When the electric field near the tip is larger than the electric field between the first electrode 110 and the second electrode 120, a discharge is generated, and the released electrons bombard the mixed gas. The oxygen molecule breaks down the oxygen molecule into two oxygen atoms; the oxygen atom and the oxygen molecule combine to form an ozone molecule under the action of an intermediate gas. It can be known from the above process of the production of ozone molecules that the amount of ozone molecules produced depends largely on the amount of electrons released, that is, the magnitude of the corona current. The corona current increases as the diameter of the end of the discharge unit decreases. In the present embodiment, the end of the discharge unit 140 is a single or a plurality of carbon nanotubes having a diameter of a diameter of a nanometer. Therefore, under the same conditions, the discharge unit 140 can be made to generate a large corona current intensity. And when each of the discharge cells 140 includes a plurality of carbon nanotubes, each of the discharge cells 140 includes a plurality of carbon nanotubes at the end, so that the same discharge cell 140 can include a plurality of discharge ends, thereby greatly increasing the density of the corona current. .

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧Ozone generating device

110‧‧‧First electrode

120‧‧‧second electrode

130‧‧‧ dielectric

140‧‧‧discharge unit

200‧‧‧Power supply

210‧‧‧ positive

220‧‧‧negative

FIG. 1 is a schematic structural view of an ozone generating apparatus according to an embodiment of the present invention.

2 is a scanning electron micrograph of a non-twisted nanocarbon line as a discharge cell in an ozone generating apparatus according to an embodiment of the present invention.

3 is a scanning electron micrograph of a twisted nanocarbon line as a discharge cell in an ozone generating apparatus according to an embodiment of the present invention.

4 is a scanning electron micrograph of a nanocarbon line as a discharge unit in the ozone generating apparatus according to the embodiment of the present invention, which is close to the end of the second electrode.

Figure 5 is a transmission electron micrograph of the tip of the nanocarbon line of Figure 4.

100‧‧‧Ozone generating device

110‧‧‧First electrode

120‧‧‧second electrode

130‧‧‧ dielectric

140‧‧‧discharge unit

200‧‧‧Power supply

210‧‧‧ positive

220‧‧‧negative

Claims (17)

An ozone generating device includes a first electrode and a second electrode spaced apart from each other, wherein the first electrode and the second electrode are at least partially disposed oppositely, and the first electrode is provided with at least one discharge adjacent to one side of the second electrode a unit for converting oxygen injected between the first electrode and the second electrode into ozone, wherein the discharge unit comprises at least one nanocarbon line from the first electrode to the second electrode Extendingly, the nanocarbon pipeline extends at least one carbon nanotube near one end of the second electrode, the ozone generating device further comprising a dielectric body disposed on the second electrode adjacent to the first electrode One side. The ozone generating device according to claim 1, wherein the carbon nanotube has a diameter of 0.4 nm to 50 nm. The ozone generating device according to claim 1, wherein the dielectric material is ceramic, glass or plastic. The ozone generating device of claim 1, wherein the dielectric body covers a surface of the second electrode facing the first electrode. The ozone generating device of claim 1, wherein the first electrode and the second electrode are two concentric and spaced cylindrical electrodes, and the first electrode is sleeved in the second electrode. The ozone generating device according to claim 1, wherein the nano carbon pipeline comprises a plurality of carbon nanotubes connected end to end and arranged substantially along an axial direction of the nanocarbon pipeline, and the adjacent carbon nanotubes pass through the van der Waals. Valli connection. The ozone generating device of claim 6, wherein the plurality of carbon nanotubes are substantially parallel to each other. An ozone generating device according to claim 6, wherein the complex A number of nano carbon tubes are arranged in an axial spiral around the nano carbon line. The ozone generating device according to claim 7 or 8, wherein the nano carbon line has a diameter of 0.5 nm to 100 μm. The ozone generating device of claim 1, wherein the discharge unit further comprises a plurality of carbon nanotubes arranged in parallel or wound into a linear structure. The ozone generating device of claim 1, wherein the nanocarbon line has a plurality of tips near one end of the second electrode, and each tip comprises a plurality of carbon nanotubes combined by van der Waals force and substantially mutually parallel. The ozone generating device of claim 11, wherein the plurality of tips are spaced apart. The ozone generating device according to claim 12, wherein a top of each tip extends a carbon nanotube in the direction of the second electrode. The ozone generating device according to claim 1, wherein the surface of the nanocarbon pipeline is provided with a metal carbide layer or a plurality of metal carbide particles, the metal carbide being tantalum carbide, titanium carbide, carbonization. One of niobium and zirconium carbide. An ozone generating device includes a first electrode and a second electrode spaced apart from each other, wherein the first electrode and the second electrode are plate electrodes arranged in parallel and spaced apart from each other, the first electrode being adjacent to one of the second electrodes The side spacing is provided with a plurality of discharge cells arranged in an array, the ozone generating device is configured to convert oxygen oxygen injected between the first electrode and the second electrode into ozone, and the improvement is that each discharge The unit includes at least one nanocarbon pipeline extending from the first electrode toward the second electrode, and the nanocarbon pipeline extends at least one carbon nanotube near one end of the second electrode, the nanocarbon pipeline including a plurality of carbon nanotubes The tubes are connected end to end and are arranged axially along the nanocarbon line. . The ozone generating device according to claim 15, wherein the surface of the protruding carbon nanotube is provided with a metal carbide layer or a plurality of metal carbide particles, and the metal carbide is tantalum carbide and carbonized. One of titanium, tantalum carbide and zirconium carbide. The ozone generating device of claim 15, wherein the ozone generating device further comprises a dielectric body disposed on a side of the second electrode adjacent to the first electrode.