1. technical name

Hydrophobic molecular sieve adsorbent for efficient treatment of volatile organic waste gases.

2. scope of application

VOCs waste gas treatment in spraying, printing, chemical, FRP, pharmaceutical, petrochemical, catering and other industries.

3. technical content

This technology is aimed at the requirements of dispersed domestic/industrial sources, low and medium concentration VOCs waste gas treatment, and good adaptability to gas volume fluctuations. It has researched and prepared overall honeycomb and rotating wheel lightweight molecular sieve materials, which can be suitable for different working conditions and conditions, solve the problems of easy cracking, low strength, slow drying speed, and poor adsorption performance during the molecular sieve forming process.

3.2 main innovations

(1) Developed a new molecular sieve material preparation technology with high hydrophobicity and large adsorption capacity, which solves the problems of low adsorption capacity, poor adsorption selectivity, limited adsorption ability, and inability to adsorb macromolecules, and hydrophobic properties to meet engineering application requirements. The adsorption performance of the molecular sieve products developed is close to or reaches the level of imported products from the United States and Japan.

(2) Developed molecular sieve forming technology, solved technical problems in binder formulation, lightweight material production, forming process design, and control of heating and roasting conditions, overcome the technical bottleneck of the adsorbent preparation process based on zeolite molecular sieve, and developed adsorber products that are close to or reach the technical level of imported products from the United States and Japan have broken the monopoly of foreign technology and products.

4. Pollution control or environmental restoration effects

Taking the volatile organic waste gas emission control and renovation project of Tianjin Airbus A320 spray painting workshop as an example, the VOCs spray gas emission control emission concentration has reached the requirements of Class A enterprises. The TRVOC emission concentration is stable below 10mg/m3, far lower than the corresponding emission limit of Tianjin City's "Volatile Organic Compound Emission Control Standard"(DB12/524-2020) of Industrial Enterprises.

5. Technology demonstration

This technology is applied to the volatile organic exhaust gas emission control and renovation project generated by the Airbus A320 painting workshop in Tianjin. The service target is the first A320 series aircraft assembly line built by Airbus in China, and the first newly built by Airbus outside Europe. single-aisle aircraft assembly line. After the device was put into operation, it is currently the only complete aircraft painting in the world.

The deep waste gas treatment project is also the largest molecular sieve fixed bed VOCs treatment project in the world. The project handles a total air volume of 650,000 m3/h, which is used to treat organic waste gas generated in aircraft painting halls and paint mixing rooms. After treatment, it generally meets the "Technical Guidelines for the Formulation of Emergency Emission Reduction Measures for Key Industries in Heavily Polluted Weather"(Revised Edition in 2020)"(Huanban Dazhong Han [2020] No. 340) The performance grading indicator requires that the emission concentration meets the requirements of Class A enterprises, which is far lower than the relevant emission standards of Tianjin City. From January 2022 to the present, it is in a stable state during operation. The measured minimum standard dry air volume of the treatment facility reaches more than 90% of the design air volume, the removal efficiency of non-methane total hydrocarbons is not less than 95%, the TRVOC emission concentration is stable below 10mg/m3, achieving VOCs emission reduction of 15.8 t/a. According to the different characteristics of emissions under different processes in the aircraft coating process, energy-saving measures have been adopted that can freely switch emission reduction processes. According to estimates from similar engineering projects, under normal operating conditions when two hangars are operating at the same time, power consumption can be effectively saved by 640000 (kW·h)/t, which is converted into CO2 emission reduction of 638t/a.

6. investment estimation

The volatile organic waste gas emissions generated by the Tianjin Airbus A320 painting workshop are being treated and renovated. The total air volume processed is 650,000 m3/h, with a total investment of approximately 23 million yuan.

7. investment recovery period

The volatile organic waste gas treatment and renovation project of Tianjin Airbus A320 spray painting workshop uses molecular sieve fixed bed process, with an annual operation and maintenance cost of 1.82 million yuan; if a zeolite runner is used, the annual operation and maintenance cost is about 5.9 million yuan.

8. Prospects for transformation and promotion of technological achievements

The "14th Five-Year Plan" period is a critical period to promote synergy and efficiency of pollution reduction and carbon reduction, promote the comprehensive green transformation of economic and social development, and achieve the improvement of ecological environment quality from quantitative change to qualitative change. The promotion and application of this technology can effectively achieve VOCs emission reduction, reduce environmental management risks of production enterprises, ensure stable production of enterprises, and at the same time facilitate environmental supervision and have good market prospects.