KR100921325B1 - decomposition device car exhaust gas - Google Patents

Abstract

The present invention relates to a vehicle exhaust gas decomposing device using a partial discharge plasma mounted on an automobile silencer, and is provided with an apparatus case in which connection assembly parts connected to the exhaust pipe of the silencer are formed on both sides, and in which the exhaust pipe is installed. Carbon filter is mounted on the rear side and the center of the pipeline is a c-shaped well-shaped bend, so that the exhaust body meets four walls and flows along the bend so that the exhaust velocity is adjusted.The four partial walls of each curved surface have electrodes and voltage supply And the partial discharge generator in which the counter electrode is integrated are fixedly arranged in parallel along the pipe line, the partial discharge generator is a DC power source, and the electrodes connected to the power source are a plurality of needle electrodes made of a heat-resistant conductive metal material. An electrode configured to form an array of squares and corresponding to the electrode Is a rectangular plate shape with perforations as many as the number of needle electrodes, the gap distance is 2mm or less, and the average voltage is applied to 20-25kV. As consisting of

Plasma and chemical and physical activators generated by plasma promote the decomposition of harmful substance molecules when the outer molecules of the background gas dominating the exhaust gas transported through the pipeline in the exhaust pipe are excited by ionizing voltage. It is to use the principle to make it, and ultimately mounted on the car silencer to provide the car exhaust fumes decomposition and scavenging effect.

An object of the present invention is to miniaturize the high-pressure discharge device, which is a motive source for the growth of low-temperature plasma, so that the source and the electrode are integrated in the exhaust gas exhaust passage of the automobile silencer and realize the device at a low cost. In order to improve the incompatibility of the plasma device, it can be commercialized in a car at a low cost, which may have a ripple effect of reducing the cause of natural air pollution.

Partial discharge. Low temperature plasma. Counter electrode. Needle electrode. Emissions. DC power. Car silencer.

Description

Decomposition device car exhaust gas using partial discharge plasma mounted on car silencer

Vehicle emission reduction technology using plasma growth by partial discharge

Hazardous substances treatment technology using low temperature plasma in developed countries is being actively researched on fixed emission sources such as power plants and mobile emission sources such as automobiles.In Korea, we are constructing an experimental scale plasma device for power plant emission gas purification and reducing automobile emissions. Research and development for Korea is also in a positive situation in the field of using low-temperature plasma.

Low-temperature plasma refers to a plasma in which the energy of electrons in the parameters constituting the plasma is greater than that of ions.

On the contrary, high temperature plasma with high temperature thermal energy, such as spraying or sputtering, also means that the energy held by ions is greater than that held by electrons.

The definition of plasma is found in the encyclopedia as follows:

[Quotation-Doosan Encyclopedia]

When the temperature of a gaseous substance is continuously heated to raise its temperature, an aggregate of particles composed of an ion nucleus and free electrons is formed. Along with the three forms of matter, solid, liquid and gas, it is called the 'fourth state of matter' and this state of matter is called plasma.

main text

Generation of plasma

Heat is applied to a solid with the lowest energy state of matter, and when the temperature rises, it becomes a liquid, and when heat energy is applied, it causes a transition to gas. Subsequently, when the gas receives more energy, ionized particles are produced that are different from the state transition, and the total number of charges of the cations and anions is about the same. This state is an electrically neutral plasma state.

Surrounding plasma state

This is a rare phenomenon on Earth, but in space, the steady state of almost all matter is plasma, and the sun's atmosphere is also filled with plasma. Plasma conditions that can be observed around us include fluorescent lamps used as lighting, neon signs commonly seen on the street, and lightning such as lightning that occurs frequently when showers occur. Aurora can also be regarded as light emitted by plasma.

Application of plasma

Plasma can be used to synthesize artificial diamond. Plasma surface coating treatment of metal remains discovered in ancient sites can prevent wear and corrosion and improve the condition of the artifacts. Plasma Display Panels (PDPs) using light emitted from plasma are widely used throughout the industry. In addition, plasma can be used to replace fossil fuels such as petroleum and coal through nuclear fusion, and the world's major developed countries are actively researching to develop alternative energy sources using plasma.

In addition to the application of plasma cited in the encyclopedia as described above, plasma and other technologies such as decomposing and eliminating toxic substances in gaseous state, surface modification of materials, ultrafine material particles, thermal spraying process using ultra-high temperature and plasma jet, etc. Recently, the development of a technical device for generating the above-mentioned low temperature plasma at low pressure or vacuum state, ignoring low pressure or vacuum state, has been realized. With this technological leap, theories and experiments are being actively used to reduce automobile emissions using low temperature plasma.

Such a theory is commonly based on the following central theory and practice.

When a high-pressure electric discharge is performed in the exhaust gas, electrons generated by the discharge collide with molecules of the exhaust gas to change the outer electron state of the gas molecules. Thus, radicals that are highly reactive chemically active species (having electricity as two or more atomic groups ⇒ examples; OH, COOH, CHO, etc.), excitation molecules, ions (electric atoms ⇒ N, O, H, Ca, etc.) It is positively or negatively charged and becomes an electrically neutral gas, which is called low temperature plasma.

Many low temperature plasma apparatuses have been developed for environmental applications. The basic principle of these devices is to create and operate a plasma that contributes a significant part of the electrical energy to producing powerful electrons. Although the lifetime of the electrons is short at atmospheric pressure and hardly collides with the molecules of the pollutant, many collisions with the background gas dominating the emissions occur. The resulting active groups promote the decomposition of harmful molecule molecules.

This technology has the advantage of treating acidic gas and dust at the same time, but because it can generate secondary pollutants such as formaldehyde, it is necessary to pay close attention to its application. With the advent of combustion engines, the current three-way catalyst system is unable to reduce the NOx to within the acceptable standards, and is proceeding with the corresponding technology. However, when the low temperature plasma is generated at atmospheric pressure, the low pressure conditions such as the vacuum chamber, or the chamber and its accessories that are effectively involved in the growth and collection of the plasma are inevitably ignored. You will need as much energy as you can. In order to supply the necessary energy stably and continuously, high frequency voltage is used as a general method. Even though the RF (high frequency voltage) voltage supply is about 13.56Mhz, the minimum size exceeds 30Cm, and the cost is also high and the device is simplified. Due to the limitations, there is no way to use the system for reducing the vehicle emissions.

Alternatively, the low temperature plasma growth method using DC power is the best method, but high voltage is required to generate gas insulation breakdown energy, and the structure of electrode, material and device structure of car are required for stable and continuous plasma growth. The focus should be on the structure to be efficient and especially low cost and productive.

The background art of the present invention has a technology center which realizes the compactness by integrating the parts of the apparatus with the above-mentioned point of focus, and is efficiently mounted and structured so as to reduce vehicle emissions.

The mechanical structure should be efficiently arranged in accordance with the structure of the automobile. Especially, the parts of the plasma generating apparatus are integrated into a compact body to realize practical use as a low cost productive product. Technology challenges

A device case is provided in which connection assembly parts connected to the exhaust pipe of the silencer are formed on both sides, and in the installation of the exhaust transport pipe, a carbon filter is mounted on the rear side of the exhaust pipe, and the center of the pipe is formed with a c-shaped well bend. It meets four walls and flows along the curvature so that the exhaust velocity is adjusted. Four partial walls on each curved surface have a partial discharge generator, in which electrodes, a voltage supply and an opposite electrode, are fixed in parallel along the pipeline. The partial discharge generator is a direct current power source, the electrode connected to the power source is composed of a plurality of needle electrodes and a heat-resistant conductive metal material to form a rectangular array, the electrode layer corresponding to the electrode is a rectangular plate shape needle electrode As the number of perforations, the gap distance is less than 2mm and the average voltage is 20 ~ 25kV When a voltage is applied so that the configuration provides a vehicle exhaust gas decomposition apparatus using a plasma discharge portion is mounted on a vehicle comprising silencer characterized in that a converter configured to be destroyed without significantly grow the arc discharge.

Decomposition and elimination effect of exhaust fumes from car

As shown in Fig. 1, the connecting assembly 17 connected to the exhaust pipe of the silencer is formed on both sides so that the exhaust gas passage is connected to the apparatus of the present invention so that the exhaust gas passage is connected to the apparatus of the present invention. The device case 11 is provided to disperse heat generated in the passage and protect the device, and an external air inlet 12 for dissipating heat and an air outlet for dissipating heat to the outside by dissipating heat to the outside of the device case. (13) is formed, and in the installation of the exhaust transport pipe therein, the carbon filter (16) is mounted on the front and rear sides of the exhaust pipe, and the center of the pipeline is formed with a c-shaped well curve, and the exhaust body (a) is (a ') To (b) gas, (b) to (b') gas, (b ') to (c'), and to (c) gas. Is formed to be adjusted and 4 per curved surface In the partial wall, a partial discharge generator (p), in which an electrode, a voltage supply and an opposite electrode are integrated, is fixedly arranged in parallel along the pipeline to perform insulation breakdown of gas molecules by a regulated gas velocity. Generator (p) is a direct current power source, and the electrodes connected to the power supply are formed of a plurality of needle-shaped electrodes made of a conductive metal material with high heat resistance, as shown in (71) of FIG. The electrode 71 and the corresponding electrode layer 72 is formed in a rectangular plate shape so that there are perforations 72 'as many as the number of needle electrodes, and the gap distance is 2 mm or less and is grounded in the generator 73. The internal structure of the generator 73 is ignored in the present invention and embedded in a thermosetting resin for the security of the internal structure, and the internal structure is broken together with the resin during forced dismantling. The average voltage is configured to be applied to 20 ~ 25kV and when the voltage is applied to the vehicle exhaust gas decomposition using a partial discharge plasma mounted on the vehicle silencer, characterized in that the converter can be destroyed without significantly increasing arc discharge To provide a device.

1 is a structural diagram of the present invention

2 is a structural diagram of a partial discharge generator

Claims (1)

A device case is provided in which connection assembly parts connected to the exhaust pipe of the silencer are formed on both sides, and in the installation of the exhaust transport pipe, a carbon filter is mounted on the rear side of the exhaust pipe, and the center of the pipe is formed with a c-shaped well bend. It meets four walls and flows along the curvature so that the exhaust velocity is adjusted, and the partial discharge generator, in which the electrode, the voltage supply and the counter electrode are integrated, is fixed in parallel along the conduit on four partial walls for each curved surface. The partial discharge generator is a direct current power source, the electrode connected to the power source is composed of a plurality of needle electrodes and a heat-resistant conductive metal material to form a rectangular array, the electrode layer corresponding to the electrode is a rectangular plate shape needle electrode As the number of perforations, the gap distance is less than 2mm and the average voltage is 20 ~ 25kV Car exhaust gas decomposing device using partial discharge plasma mounted on car silencer, which is configured to be applied to voltage and apply voltage so that it can be destroyed without large arc discharge.

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