Treatment of industrial waste gas is the core link of the chemical industry to achieve green and sustainable development. Catalytic combustion technology is a key technology for efficient treatment of organic waste gas, and the performance of its front-end filtration system directly affects the operating efficiency and safety of the overall system. The self-cleaning air filter independently developed by Henan Xinxiang Lifelte Filter Co., Ltd. breaks through the application bottleneck of traditional filtration equipment in complex chemical industry conditions through technological innovation, and provides a reliable pre-guarantee for catalytic combustion system. From three dimensions of technical principle, application scenario and practical case, this paper systematically analyzes the innovative value of self-cleaning air filter in chemical waste gas treatment. After the gas filter, the technology breakthrough of the catalytic combustion system self-cleaning air filter Liefert self-cleaning air filter adopts the design concept of combining multi-stage filtration and intelligent self-cleaning technology, and its core technical architecture contains three key modules: **1. Gradient filtration system ** Equipment first "initial effect interception - medium effect adsorption - efficient capture" three-stage filtration system. The initial effect filter layer adopts corrugated stainless steel filter screen, the porosity is controlled at 40-60μm, effectively intercepting large particles of dust and droplets in the exhaust gas; The middle effect layer is made of modified activated carbon fiber material with a specific surface area of 1500m²/g, and the adsorption efficiency of VOCs (volatile organic compounds) is 85%. The high efficiency layer uses PTFE (polytetrafluoroethylene) coated filter material, and the filtration accuracy can reach 0.3μm, ensuring that the dust concentration of the exhaust gas entering the catalytic combustion unit is less than 5mg/m³. **2. Intelligent pulse self-cleaning mechanism ** To solve the problem that viscous particles in chemical exhaust gas are easy to block the filter material, Liffert has developed the "pneumatic pulse + acoustic vibration" composite cleaning technology. When the pressure difference sensor detects that the filter resistance reaches the set threshold, the system automatically triggers 0.6MPa compressed air pulse, and combines with 20kHz high-frequency acoustic vibration to achieve 99% ash removal rate on the filter surface. Compared with the traditional manual cleaning method, the self-cleaning frequency can be increased by 3 times, and the service life of the filter element can be extended to 2.5 times that of traditional products. **3. Corrosion-resistant material system ** For the corrosion problem of acidic gases (such as HCl, SO₂) in chemical waste gas, the equipment frame is made of 316L stainless steel, the filter material coating is added with nano-alumina anti-corrosion agent, and the continuous operation is 3000 hours under 80℃ high temperature and pH 3-11 environment, and the performance attenuation rate is less than 8%. This technological breakthrough solves the problem of frequent replacement of traditional filters in corrosive environments. Second, the application of scene in the typical process of chemical industry in different process links, self-cleaning air filters show unique adaptability: **1. Solvent recovery process ** In the waste gas treatment of the organic solvent recovery unit, the filter needs to deal with high concentrations of VOCs (up to 5000ppm) and toluene, xylene and other viscous organic matter. Through the synergistic effect of the high-efficiency adsorption layer and the self-cleaning system, the Liffelter equipment ensures that the VOCs concentration of the exhaust gas before entering the catalytic combustion unit is reduced to less than 200ppm, meeting the requirements of the Integrated Emission Standard for Air Pollutants (GB 16297-1996). **2. Nitrification reaction exhaust treatment ** Nitrification process produces exhaust containing nitric acid fog and nitrobenzene harmful substances, and traditional filters are prone to failure due to nitric acid corrosion. Using acid-resistant coated filter material and closed self-cleaning system, Lifelter extended the average maintenance cycle of the exhaust gas treatment system from 45 days to 180 days in the practical application of a chemical plant in Shandong, and the removal rate of nitric acid fog was stable at more than 98%. **3. High temperature pyrolysis waste gas treatment ** The exhaust gas temperature of the cracking furnace can reach 250℃, and the ordinary filter can not withstand the high temperature environment. Through the design of high temperature resistant filter material (temperature 300℃) and thermal insulation buffer structure, Lifelter has achieved continuous and stable operation in the cracking unit of a petrochemical enterprise in Guangdong Province, and the filtration efficiency remains above 95% under high temperature conditions.
The economic benefit analysis shows that the return on investment of the equipment is only 1.3 years, which significantly reduces the operating costs of enterprises while improving environmental compliance. The intelligent self-cleaning system can reduce manual cleaning hours by 200 hours per year and indirectly increase production efficiency by 3%. Technical challenges and future development direction Although self-cleaning air filters have made significant progress, there is still room for optimization in terms of extreme working condition adaptability and intelligence: **1. ** For fluorine-containing waste gas (such as HF) and ultrafine particulate matter (PM0.1) filtration efficiency needs to be further improved, it is recommended to develop new composite filter materials (such as graphene modified materials). **2. Intelligent diagnosis system ** AI predictive maintenance technology is introduced to monitor filter resistance, temperature, humidity and other parameters through the Internet of Things in real time to predict equipment failure in advance, turning passive maintenance into active prevention. **3. Modular Integrated design ** Develop standardized modules to achieve seamless docking with catalytic combustion units and waste heat recovery systems, further reducing system integration costs. The self-cleaning air filter of Henan Xinxiang Lifelte Filter Co., Ltd. effectively solves the filtration problem in the treatment of waste gas in the chemical industry through technological innovation, and provides a reliable guarantee for the efficient application of catalytic combustion technology. In the future, with the integration of new materials and intelligent technology, the equipment is expected to play a key role in the broader chemical industry scene, and promote the industry to the green development direction of "ultra-low emission, intelligent operation and maintenance".
