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Exhaust gas treatment equipment treatment principle

作者: 人气: Article Source: Author: Popularity: Issuing time: 2017-6-24 10:44:28
Exhaust gas treatment equipment treatment principle



Dilution diffusion method


Principle: The odorous gas is discharged to the atmosphere through the chimney, or diluted with odorless air to reduce the concentration of odorous substances to reduce odor. Scope of application: It is suitable for the treatment of malodorous gases emitted at medium and low concentrations. Advantages: low cost and simple equipment. Disadvantages: susceptible to meteorological conditions, malodorous substances still exist.


Water absorption method


Principle: The characteristics of some substances in the odor are easily soluble in water, so that the odor components are directly in contact with water, so as to dissolve in the water to achieve the purpose of deodorization. Scope of application: malodorous gas with water-soluble and organized emission sources. Advantages: simple process, convenient management, low operating cost of the equipment and secondary pollution, and the washing liquid needs to be processed. Disadvantages: low purification efficiency, it should be used in combination with other technologies, and has a poor treatment effect on mercaptans and fatty acids.


Aerated activated sludge deodorization method


Principle: Disperse the malodorous substance in the mixed liquid containing activated sludge in the form of aeration, and the microorganisms that grow by suspension can degrade the malodorous substance for a wide range of applications. Scope of application: As of 2013, Japan has been used for odor treatment in manure treatment plants and sewage treatment plants. Advantages: After domestication of activated sludge, the removal rate of odor components that do not exceed the limit load can reach more than 99.5%. Disadvantages: Due to the limitation of aeration intensity, the application of this method is still limited.


Multi-media catalytic oxidation process


Principle: The reaction tower is filled with a special solid filler, and a multi-medium catalyst is arranged inside the filler. When the malodorous gas passes through the filler layer under the action of the induced draft fan, it comes into full contact with the liquid-phase compound oxidant sprayed in a divergent mist form through the special nozzle on the surface of the solid-phase filler, and under the catalysis of the multi-medium catalyst, the malodorous gas The contamination factor is fully decomposed. Scope of application: The scope of application is wide, especially suitable for the treatment of atmospheric, medium and high concentrations of exhaust gas, and it has a good removal rate of hydrophobic pollutants. Advantages: small footprint, low investment, low operating cost; easy management, ready to use. Disadvantages: impact resistance load, difficult to affect the concentration of pollutants and temperature changes, need to consume a certain amount of medicine.


Low temperature plasma


Low-temperature plasma is the fourth state of matter after solid, liquid, and gaseous states. When the applied voltage reaches the ignition voltage of the gas, gas molecules are broken down, producing a mixture including electrons, various ions, atoms and free radicals . Although the electron temperature is high during the discharge, the temperature of the heavy particles is very low, and the whole system is in a low temperature state, so it is called low temperature plasma. Low-temperature plasma degradation of pollutants is the use of these high-energy electrons, free radicals and other active particles and pollutants in the exhaust gas, so that the pollutant molecules are decomposed in a very short time, and various subsequent reactions occur to achieve the degradation of pollutants the goal of.
The low-temperature plasma air purification equipment can significantly control the pollution: VOC, malodorous gas, odor gas, soot, dust, and can also be used for disinfection. Low-temperature plasma technology is a completely new purification process, does not require any additives, does not generate waste water, waste residue, and does not cause secondary pollution.