Working principle of low temperature plasma purifier
In the waste gas treatment, the washing system is used to carry out pre-chemical reaction with the waste gas in the washing tower, remove the dust, and the gas after the chemical reaction can reach the primary purification treatment of the waste gas, specifically including special packing, spray device, dehydration layer, fan, dosing system, etc.
The low temperature plasma purifier is equipped with an impinged suction unit to intercept and remove particulate matter in the exhaust gas. The multi-element gas collected by the exhaust gas collection system passes through the plasma reactive oxygen purification device. Under the action of the high pressure plasma electric field, the ionized initial oxygen carries out ionization and charge purification of the ions in the exhaust gas. Charged small ions (dust particles) are collected by the adsorption unit and flow into and deposited in the dust storage box of the gas treatment device. The harmful gas in the gas is sterilized by the ozone generated in the electric field, and the peculiar smell is removed. The harmful gas is removed to achieve the purpose of waste gas treatment.
Adsorption catalytic purification treatment unit is a kind of dry waste gas treatment equipment. It is composed of a box body and an adsorption unit loaded in the box body. The adsorption unit adds a catalyst according to the requirements of waste gas treatment to achieve the purpose of further removing the odor gas. The control system is mainly used to control the startup and shutdown of the system, detect the operation effect of the system, and feedback the running state and technical parameters of the system, so as to make the equipment in a better running state and realize unwatched.
Under the general design concept of electrocatalysis, this process is divided into three independent and mixed excitation systems: microwave excitation area, plasma excitation area, plate excitation. Each excitation area has its specific function, but it has its similar place in principle.
1. Microwave excitation area
This process has 3 to 9 microwave excitation unit, according to the different quantity of treated air volume is different, because of its frequency of microwave is relatively high, in the nanosecond time effectively in treated space (area), as a result of the microwave power is relatively small, so the excitation ability that is electronic can get transition ability is limited, this design is just at the beginning of the microwave as frequency excitation source, In the processing process as a kind of pre-excitation energy. Due to the pre-excitation function of microwave, the excitation ability and treatment effect of plasma area and plate area are greatly improved. Due to the application of microwave technology, the process is refined and the effect is superior in the comparison of similar equipment.
2, low temperature plasma excitation
The process consists of 40 to 240 tubes filled with special gas, which are composed of low temperature plasma excitation area. The low temperature plasma area is the core technology of the process. Many foreign scientific research institutions claim that low temperature plasma can be realized under normal pressure. From a large number of experimental analysis, atmospheric pressure low temperature plasma to difficulties in industrial application is still large, this process with the aid of low-pressure electrodeless lamp as the excitation of low temperature plasma body, the larger limit in the infinite district to realize the low temperature plasma area, due to the low temperature plasma with strong energy balance in the process of energy transition, disability, rarely in the particles, So low temperature plasma as an atomic excitation is the most ideal kind of energy. In practice, the big question is what is the low pressure? What kind of gas fills the tube most economically? There is no theoretical model, only practice, experiment and analysis.
3, Plate area
According to the flow rate of the treated gas plate between the electricity of subsection 12 kv, 16 kv to 42 kv, plate between the high enough voltage, in under the action of wind, polar region due to the effect of negative pressure, according to the Faraday dark space theory, theory of photoionization, freedom from theory, under the condition of normal pressure or close to atmospheric pressure a probability of particles may realize the low temperature plasma.
According to the three types of functional areas, the purpose of concentration is to achieve low-temperature plasma. Due to the differences between theoretical and practical use conditions, there are differences in power and external conditions for obtaining low-temperature plasma by a single method. This process is a combination of three technologies. The field test of many pharmaceutical and chemical enterprises shows that the removal rate of raw gas is very ideal. According to the test of Nippon Company, the removal rate of high concentration waste gas can reach more than 84%.
Electrocatalytic oxidation process integrates low-temperature plasma, microwave discharge and plate discharge. It is a very complex process to realize effective waste gas treatment in practice, and the whole process can be completed in less than 1 second. From theory to model can probe into the relevant mechanism, through three ways, the concentration of discharge waste gas molecules from low energy E, in one over one thousand of a second transition level enough to make its ionization Em, exhaust gas molecular bond rupture in full, in the avalanche of impact fracture after particles because of its smaller quality be further transition, react with hydroxyl oxygen ions within the reactor, To produce harmless, odorless CO2, H2O, and other high-priced compounds. At the same time, due to the effects of ozone and ultraviolet radiation in the reactor, different categories of exhaust compounds are completely removed, resulting in a relatively wide spectrum of removal space in the field.
