Device used for plasma negative pressure electro discharge treatment of high concentration VOC industrial exhaust gas

Abstract

The invention discloses a device used for plasma negative pressure electro discharge treatment of high concentration VOC industrial exhaust gas, and belongs to the technical field of air purifying. The device comprises an electro discharge chamber (16) and a vacuum pump (13); the upper part of the electro discharge chamber (16) is provided with a gas inlet, and the lower part of the electro discharge chamber (16) is provided with a gas outlet; the gas outlet is connected with the vacuum pump (13); an external electrode (6) and an internal electrode (7) are arranged in the electro discharge chamber (16); the external electrode (6) is designed to be circular; the internal electrode (7) is arranged at the circle center of the external electrode (6); the surface of the external electrode (6) close to the internal electrode (7) is designed to be a smooth circular surface; the internal electrode (7) is designed to be columnar; the external electrode (6) and the internal electrode (7) are connected with a medium high frequency alternating current power supply (28) respectively. The advantages are that: electro discharge is more uniform; the vacuum pump is adopted to achieve negative pressure; no medium blocking is caused between the internal electrode (7) and the external electrode (6); the electro discharge distance between electrodes is large, wind resistance is low, energy consumption is low, treatment of high concentration VOC exhaust gas can be realized, and the purifying effect is excellent.

Description

technical field [0001] The invention relates to a device for treating high-concentration VOC industrial waste gas by plasma negative pressure discharge, which belongs to the technical field of air purification. Background technique [0002] Plasma is widely used, from our daily life to industry, agriculture, environmental protection, military, medicine, aerospace, energy, high concentration treatment of industrial waste gas VOC in the field of environmental protection, modification of industrial and civil materials, hospital surgery It has very important application value in the disinfection and sterilization of medical equipment and medical equipment in pharmaceutical factories, indoor air purification, and disinfection of agricultural and sideline products. [0003] Under normal pressure, the equipment treats VOC industrial waste gas. When the VOC concentration in the waste gas reaches the explosion limit and the oxygen content in the waste gas is above 10%, it is cut in a...

AI Technical Summary

Problems solved by technology

The disadvantages of the above technologies are high energy consumption, high heat, large wind resistance, and low frequency. The reasons are mainly reflected in four aspects: 1. The medium covered on the two electrodes is generally made of inorganic materials, such as quartz glass and ceramics. In practical applications, in order to consider the mechanical strength and service life, the thickness of the medium is generally designed to be between 1 and 2mm. The thicker the medium, the greater the dielectric constant, and the higher the voltage supplied between the two poles, the greater the energy consumption. The higher the temperature

2. Double-dielectric barrier discharge or single-dielectric discharge is generally discharged under normal pressure, especially when used in industrial waste gas treatment. The waste gas has complex components and large water vapor, so most of the electronic energy is consumed on water vapor, and the energy is not available. To effectively use, it will also lead to increased energy consumption

3. Dielectric barrier discharge is applied to discharge at normal pressure. Due to the influence of oxygen and water in the air, the electron or ion movement distance between the poles cannot be extended, so the discharge distance is not large, and generally can only be controlled Between 0.3~20mm, the smaller the discharge distance, the greater the wind resistance and the smaller the ventilation, so the application is limited

4. The dielectric barrier discharge is a positive discharge, that is, the double dielectric electrode is equivalent to a capacitor. The larger the discharge area (electrode area), the larger the capacitance, and the larger the capacitance, the longer the charging and discharging time, and it is compatible with the power step-up transformer The coil forms an LC circuit, so the discharge efficiency is not high. Generally, the frequency is set in the range of 3.5~6Hz. The lower the discharge frequency, the less electron energy the air receives when it flows through the discharge area, and the less ideal the purification effect is.

Images