Speaking of VOCS exhaust gas, friends who have learned about it may know that it is an irritating gas that can damage the living environment, such as: odorous gases emitted by pharmaceutical, industrial, oil refining and other industries. This gas is not only unpleasant but also irritating, especially the nose and lungs, which have the greatest impact.
In recent years, our country has also begun to pay attention to the monitoring and prevention of volatile organic compounds. However, some studies have shown that even if odorous substances are removed by 90%, the odor concentration perceived by the human sense of smell is only reduced by less than half. This determines that the treatment of volatile organic compound exhaust gas is more difficult than preventing other air pollutants.
The generation of vocs exhaust is not a recent problem. It comes in many types and comes from a wide range of sources. VOCs treatment methods for different types of VOCs gases are also different
The following will introduce several waste gas treatment methods
Adsorption recovery and purification technology
Adsorption recovery technology It is a simple and practical volatile organic compound treatment technology that can effectively treat organic waste gas and recover organic solvents. It not only solves the problem of environmental pollution, but also creates considerable economic benefits. It is widely recognized by enterprises and has good Market application prospects. Adsorption recovery technology mainly uses adsorption materials to absorb organic solvents in exhaust gas, and then desorbs and recovers the organic solvents.
Working principle:
This technology uses granular activated carbon/activated carbon fiber as the adsorption material. The saturated adsorption material uses the heat source to evaporate the adsorbent, and the desorbed high-concentration organic vapor is desorbed The medium is brought into the condensation unit, and the organic solvent is recovered through condensation separation. Depending on the desorption medium, there are steam desorption-solvent recovery attachment technology and hot nitrogen desorption-solvent recovery technology.
Technical features:
1. Using high-efficiency adsorption materials, the adsorption efficiency is above 95, and the solvent recovery rate is above 90.
2. Systematic explosion-proof design and safety node monitoring, as well as a complete product quality assurance system, ensure equipment safety and meet the stringent requirements of chemical industry sites.
3. For non-water-soluble organic solvents, the activated carbon adsorption-water vapor desorption-solvent recovery process is used, which has the advantages of high phase change heat, complete desorption, and easy condensation, and can realize the separation of organic solvents and water. automatic and effective separation.
4. For highly water-soluble or easily hydrolyzable organic solvents, the activated carbon adsorption-nitrogen desorption-solvent recovery process is used. The water content in the recycled products is low, the solvent is of high quality, and operating costs can be reduced;
5. The adsorption bed is equipped with an activated carbon protection system to fully ensure the safety of the facility. Programmable controller (PLC)-based control has data acquisition and remote control functions.
Regenerative catalytic combustion
The regenerative catalytic combustion (RCO) treatment process is developed on the basis of catalytic combustion. Under the action of precious metal catalysts, the The organic gas is heated to the decomposition temperature to achieve purification effect, and the effect is good when used in a high-concentration air volume waste gas environment.
Working principle:
In the process of catalytic purification of exhaust gas, the exhaust gas is sent to the heat exchanger by the fan through the pipeline, and the exhaust gas is heated to the starting temperature required for catalytic combustion. . The preheated exhaust gas is burned through the catalyst layer. Due to the role of the catalyst, the starting temperature of exhaust gas combustion in the catalytic combustion method is about 250 to 300 degrees Celsius, which is much lower than the combustion temperature of 650 to 800 degrees Celsius in the direct combustion method. The high-temperature gas enters the heat exchanger again, is cooled by heat exchange, and finally The lower temperature is discharged into the atmosphere through the fan.
Technical features:
1. Easy operation: automatic control is realized when the equipment is working.
2. Low energy consumption: It takes about 20 minutes after the equipment is started to heat up to the combustion temperature. When the concentration of organic waste gas is high, the energy consumption is only the power of the fan.
3. Safe and reliable: The equipment is equipped with fire blocking system, explosion-proof pressure relief system, over-temperature alarm system and advanced automatic control system.
4. Small resistance and high purification efficiency: Using today's advanced precious metal palladium and platinum impregnated honeycomb ceramic carrier catalyst, it has a large specific surface area.
5. The waste heat can be reused: the waste heat can be returned to the drying tunnel to reduce the power consumption in the original drying tunnel; it can also be used as a heat source in other aspects.
6. Small footprint: only 80% of similar products in the same industry, and there are no special requirements for the equipment foundation.
7. Long service life: The catalyst is generally replaced every 4 years, and the carrier is regenerable.