How to deal with VOC waste gas produced by painting in shipyard

Catalytic combustion is the most important treatment method for waste gas treatment in shipyards. The air volume required for customizing the equipment can be saved. First, the amount of waste gas should be investigated, and then the location of treatment equipment. How many meters the pipeline needs, how many bends and so on. Be sure to survey the scene first.

The following is a detailed introduction to the treatment methods of industrial waste gas treatment equipment for you. Different methods are aimed at the exhaust gas of different industries.

1, masking method

Principle: The stronger aromatic smell is mixed with the smell to cover up the smell and make it acceptable.

Scope of application: It is suitable for occasions where the influence of low-concentration malodorous gas needs to be eliminated immediately and temporarily. The malodorous intensity is about 2.5, and there is no organized emission source.

Advantages: it can eliminate the influence of odor as soon as possible, with great flexibility and low cost.

2. Dilution diffusion method

Principle: Exhaust the smelly gas into the atmosphere through a chimney, or dilute it with odorless air to reduce the concentration of odorous substances to reduce the odor.

Scope of application: It is suitable for treating malodorous gas with medium and low concentration and organized emission.

Advantages: low cost and simple equipment.

3. Thermal combustion method and catalytic combustion method

Principle: At high temperature, malodorous substances are fully mixed with gas to realize complete combustion.

Scope of application: It is suitable for treating combustible gas with high concentration and small gas volume.

Advantages: high purification efficiency, complete oxidation and decomposition of malodorous substances.

4. Water absorption method

Principle: Using the characteristic that some substances in odor are easily soluble in water, the odor components are directly in contact with water, thus being soluble in water, so as to achieve the purpose of deodorization.

Scope of application: Odor gas from water-soluble organized emission sources.

Advantages: simple process, convenient management, low equipment operation cost and no secondary pollution, so it is necessary to treat the washing liquid.

5, liquid absorption method

Principle: Some substances in the odor react with the liquid medicine to remove some odor components.

Scope of application: suitable for treating odor with large atmospheric volume and high concentration.

Advantages: Some peculiar smell components can be treated pertinently, and the process is mature.

6. Adsorption method

Principle: The malodorous substances are transferred from gas phase to solid phase by the adsorption of adsorbent.

Scope of application: It is suitable for treating malodorous gases with low concentration and high purification requirements.

Advantages: high purification efficiency, capable of treating multi-component malodorous gas.

7. Deodorization method of washing activated sludge

Principle: The malodorous substances are fully contacted with the mixed liquid containing suspended sludge, so that they can be removed from the malodor in the absorber, and the washing liquid is sent to the reactor to degrade the dissolved malodorous substances through the metabolic activities of suspended microorganisms.

Scope of application: the scope of application is large, and it can deal with the odor in the atmosphere, while the operating conditions are easy to control and the floor space is small.

8. Aerated activated sludge deodorization method

Principle: Odor substances are dispersed in the mixed solution containing activated sludge in the form of aeration, and are degraded by suspended microorganisms, which has a wide application range.

Scope of application: At present, Japan has been used for odor treatment in manure treatment plants and sewage treatment plants.

Advantages: After acclimation of activated sludge, the removal rate of malodorous components not exceeding the limit load can reach above 99.5%.

9. Three-phase multi-media catalytic oxidation process

Principle: The reaction tower is filled with special solid composite packing, and the packing is compounded with multi-media catalyst. When the malodorous gas passes through the packing layer under the action of the induced draft fan, it fully contacts with the liquid-phase composite oxidant sprayed by the special nozzle on the surface of the solid packing, and the pollution factors in the malodorous gas are fully decomposed under the catalysis of the multi-media catalyst.

Scope of application: It has a wide range of application, especially suitable for treating waste gas with large atmospheric volume and medium and high concentration, and has a good removal rate of hydrophobic pollutants.

Advantages: small floor space, less investment and low operating cost; Easy to manage and ready to use.

10, low temperature plasma technology

Principle: In the process of dielectric barrier discharge, particles with extremely high chemical activity such as electrons, ions, free radicals and excited molecules are generated inside the plasma. The pollutants in the waste gas react with these high-energy active groups, and then are converted into CO2, H2O and other substances, thus purifying the waste gas.

Scope of application: wide application range and high purification efficiency, especially suitable for multi-component malodorous gases that are difficult to be treated by other methods, such as chemical industry, medicine and other industries.

Advantages: the electron energy is high, and almost all malodorous gases can be separated. Common faults and solutions of pulse bag filter in gas holder.