Research on Engineering Technology Scheme for VOCs Waste Gas Treatment

This article mainly focuses on the technical solution for VOCs waste gas treatment, based on the characteristics of VOCs waste gas treatment. It conducts research and analysis from several aspects, including the rational selection of VOCs waste gas treatment technology, the adoption of the wet scrubbing scheme, and the design of the waste gas treatment process. The aim is to promote better treatment of VOCs waste gas, thereby minimizing the adverse impact on the environment to the greatest extent, and further promoting the stable and continuous progress and development of China's industrial sector.

The rapid development of the social economy has largely promoted the development of China's industrial sector. As a result, the number of industrial enterprises has increased, providing a solid force for the more stable development of China's society and economy. However, during the development process of industrial enterprises, harmful substances have been emitted, especially the emission of VOCs waste gas, which has had certain adverse effects on the lives and physical safety of the people in our country.

Based on this, relevant government departments need to increase the treatment of VOCs waste gas. However, in the industrial production process of China, most enterprises have not equipped with VOCs waste gas treatment equipment, and the treatment of VOCs waste gas is still in the initial stage. In response to this situation, relevant departments need to actively introduce advanced treatment technologies to promote the effect of VOCs waste gas treatment.

1. Characteristics of VOC Waste Gas Treatment

1.1 Condensation Treatment Technology

From the current engineering technology for VOCs waste gas treatment, this method is relatively common. It mainly utilizes the different saturation characteristics of organic substances at different temperatures to reduce the system pressure and increase it. Then, the organic substances in the steam environment are extracted through condensation. After condensation extraction, purified organic waste gas can be obtained, and the VOCs in the waste gas can be recycled and utilized. The treatment method is relatively simple and convenient to operate, but it is not suitable for the iron smelting industry or other high-risk industries. The content of VOCs in the emitted waste gas from these industries is not very high. If only using ordinary condensation technology, it cannot achieve good separation. If separation is to be completed, more costs need to be invested and more advanced technologies need to be used for recovery. Therefore, this treatment technology has certain limitations and is not applicable to all VOCs waste gas treatment.

1.2 Dissolution Absorption Treatment Technology

During the treatment of VOCs waste gas, the dissolution absorption treatment method can also be used. This method mainly utilizes the principle that harmful substances can dissolve in water. Through the application of other principles, the harmful substances in it are gradually transformed into useful components, thus no longer causing adverse pollution to the atmospheric environment. Although this technical method has a simple operation process, it is not suitable for large-scale VOCs waste gas treatment. Therefore, it is more applicable to small-scale VOCs waste gas treatment.

2. Technical Solution for VOCs Waste Gas Treatment

2.1 Pay Attention to the Rational Selection of VOCs Waste Gas Treatment Technology

When choosing the technical solution for treating VOCs waste gas, relevant treatment personnel need to fully combine the characteristics of VOCs waste gas, study and analyze the cost and effect of VOCs waste gas treatment, and scientifically and reasonably select the VOCs waste gas treatment technology. For example, the additive spray purification process. This technical solution has relatively less treatment art and does not require a large amount of investment. It also has a relatively convenient operation process.

2.2 Photo-oxidation Catalytic Treatment Technology

At present, the main method is to use catalysts under the action of light to decompose VOCs. This technology is one of the more advanced treatment technologies at present. The most commonly used catalyst is semiconductor materials, which not only have a strong catalytic effect but also have no adverse effects.

Meanwhile, the price of this photo-oxidation catalyst is relatively low and it is highly safe. Therefore, this treatment technology is also widely applied. With the rapid development of science and technology, a new type of nano photo-oxidation catalytic material has emerged and is gradually known to people. And this material has higher safety and environmental protection properties.

2.3 Wet Washing Scheme

This engineering technical scheme mainly involves adding an appropriate amount of absorbent to the VOCs exhaust gas, and then using multi-level spray washing and dehydration processes to treat the exhaust gas.

Firstly, fully utilize the induced draft fan and then drive the VOCs exhaust gas to rise from the bottom of the tower to the purification tower. In this process, the spray water in the first-stage packing layer will present a water film form. When the VOCs exhaust gas passes through this layer of packing, most of the exhaust gas will be absorbed into the water film, and the remaining exhaust gas that has not been absorbed into the water film will enter the second and third zones for further absorption. The packing layer in the tower is mainly for equipment transmission, so that the gas and liquid components can be effectively connected.

At the same time, the packing support plate is mainly located at the bottom of the packing tower and mainly plays the role of packing. Therefore, in the process of setting the packing support plate, it can be set above the packing to maximize the blowing away of gas by the packing.

In addition, after the spray liquid is sprayed into the packing, it will flow out from the outer layer of the packing, and the gas is sent out from the bottom of the tower for further treatment, and it will also be sent into the packing together with the liquid for subsequent transmission. Generally speaking, the spray liquid has the characteristic of regeneration, which can effectively prevent the adverse impact on the overall VOCs exhaust gas treatment during the washing process due to the lack of spray liquid.

2.4 Exhaust Gas Treatment Process Design

During the design of the VOCs exhaust gas treatment engineering technology, relevant staff also need to scientifically and reasonably select the process, and then make a reasonable choice of the design scheme based on the concentration and composition of the exhaust gas and other related factors. At the same time, a comprehensive and systematic consideration of the characteristics of exhaust gas discharge should be carried out to conduct scientific and effective environmental economic evaluation.

At the same time, in the process of selecting the VOCs exhaust gas treatment technology, relevant staff also need to be able to scientifically and reasonably choose the evaluation effect of the treatment method. Since the spray section exhaust gas treatment can cause secondary pollution to the environment, it is necessary to fully utilize activated carbon adsorption to scientifically and reasonably treat the VOCs exhaust gas.

Moreover, from an objective perspective, there are many advantages and disadvantages in VOCs exhaust gas treatment technology. For example, compared with activated carbon, the absorbent in the exhaust gas treatment process does not have a higher processing safety coefficient. When treating the same volume of exhaust gas, the use of spray method will consume less induced draft fan power and can reduce energy consumption to a certain extent. 

Secondly, the application operation process of VOCs exhaust gas treatment technology is relatively simple. There is no need to replace activated carbon at any time, which is conducive to the better implementation of system maintenance work.

Finally, in the process of actually applying waste gas treatment technologies to treat VOCs waste gas, this method can also reduce the potential hazards such as high pressure and high temperature caused by activated carbon, and can largely ensure the safety and stability of the system operation.

Conclusion:

Since VOCs waste gas poses a significant threat to people's lives, it is necessary to increase the attention to the treatment of VOCs waste gas. However, at present, the technologies for treating VOCs waste gas are quite diverse, and in the future, the treatment of VOCs waste gas will also move towards new development directions, and each has its own advantages. Based on this, in the process of treating VOCs waste gas, it is necessary to scientifically and reasonably select the VOCs waste gas treatment method according to the actual waste gas situation, so as to minimize the pollution to the environment and further create a good living environment for people.

The article is excerpted from the Internet.

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