In the aircraft manufacturing sector, VOCs waste gas generated by aircraft coating processes features typical characteristics of high air volume, low concentration and complex composition, which has long been a difficulty in industrial waste gas treatment. A large aircraft coating enterprise in Tianjin, facing the dual pressures of tightening emission standards and rising operating costs, finally chose CADAIR Industrial Brain Intelligent Hub AI energy-saving equipment to carry out intelligent upgrading of its original zeolite rotor + RTO treatment system. Up to now, this AI intelligent VOCs treatment system has been in continuous and stable operation for more than 500 days, verifying the core value of intelligent transformation with solid energy-saving data.
Project Background: Dual Challenges of Aviation Coating VOCs Treatment
Aircraft coating technology involves multiple spraying processes such as primer, topcoat and clear coat. The waste gas contains a variety of organic pollutants such as benzenes, esters and ketones. In addition, the ventilation volume of the spraying workshop is large, and the waste gas concentration fluctuates significantly. The Tianjin project has a designed treatment air volume of 500,000 m³/h and adopts the industry mainstream combined process of “pretreatment + zeolite rotor concentration + RTO regenerative incineration”. Although the purification efficiency can meet emission requirements, the traditional fixed-parameter operation mode has obvious shortcomings:
- Fans operate at full load for a long time, resulting in high power consumption
- RTO combustion temperature is set at a conservative value, causing serious waste of gas supplementary combustion
- The desorption cycle of the zeolite rotor is fixed and cannot be dynamically adjusted to match the production rhythm
- Regulation relies on the experience of operation and maintenance personnel, with lagging response and insufficient accuracy
Under the increasingly strict supervision environment of Tianjin local standard DB12/524-2020, enterprises need to ensure stable and compliant emissions while controlling high operating costs, which is difficult to balance with the traditional treatment mode. Choosing CADAIR for the AI intelligent VOCs treatment system has become the key solution for the project to break through the dilemma.
Solution Implementation: AI Intelligent Upgrading of Zeolite Rotor + RTO Process
In view of the 500,000 m³/h air volume scale of the project, CADAIR adopted a non-intrusive retrofit solution, connecting the industrial brain intelligent hub AI energy-saving equipment to the entire treatment system without modifying the original core control system or affecting normal production.
Core Process Chain
- Pretreatment Unit: Waste gas passes through multi-stage filtration to remove paint mist particles and impurities, protecting the subsequent zeolite rotor packing and extending the service life of the equipment
- Zeolite Rotor Concentration: High-volume and low-concentration waste gas is adsorbed and concentrated through hydrophobic zeolite molecular sieve, with a concentration ratio of 15-25 times, greatly reducing the treatment scale of the downstream RTO
- RTO Regenerative Incineration: The concentrated high-concentration waste gas enters the Regenerative Thermal Oxidizer (RTO) and is completely oxidized and decomposed at a high temperature above 750℃, with a purification efficiency of ≥99% and a heat recovery efficiency of over 95%
Core Capabilities of the AI Intelligent Hub
Based on a proprietary algorithm model trained on VOCs treatment operation data across multiple industries and working conditions, the CADAIR Industrial Brain performs dynamic optimization of the full-process parameters of the system:
- Full-dimensional Data Acquisition: Real-time monitoring of dozens of parameters including temperature, pressure, LEL concentration, fan speed, valve status and production rhythm
- Intelligent Dynamic Temperature Adjustment: Real-time adjustment of RTO combustion chamber temperature according to inlet VOCs concentration, eliminating temperature redundancy caused by manual conservative settings
- Fan Variable Frequency Linkage: Precisely matches fan power to actual air volume demand, avoiding ineffective idling losses
- Rotor Cycle Optimization: Dynamically adjusts the adsorption-desorption switching rhythm of the zeolite rotor to maximize concentration efficiency
- Safety Backup Mechanism: Built-in multi-dimensional safety interlock protection mechanisms for temperature, pressure and concentration, etc., which switches back to the original control scheme in milliseconds under abnormal working conditions to ensure the unshakable bottom line of compliance
Operation Results: 500+ Days of Stable Verification, Win-Win for Energy Consumption and Emissions
Since the system was launched, this AI intelligent VOCs treatment system has been in continuous and stable operation for more than 500 days, with all indicators better than expected. Measured and calculated by a third party, the energy-saving benefits are very significant:
- 26.9% savings on electricity bills: A total annual electricity cost saving of 77,862 yuan, mainly from the variable frequency intelligent control of main fans and desorption fans
- 36.2% savings on gas bills: A total annual gas cost saving of 84,597.86 yuan, as AI dynamic temperature control precisely eliminates excessive supplementary combustion
- 15%-50% reduction in overall operating costs: The overall system operating cost is significantly reduced, and the investment payback period is at an excellent level in the industry
- Stable and compliant emissions: The outlet non-methane total hydrocarbon concentration is consistently and stably below 20 mg/m³, fully meeting the requirements of Tianjin local standards
It is worth mentioning that the project is equipped with a mobile remote monitoring system. Operation and maintenance personnel can check the system operation status and energy consumption data at any time, and the fault warning response time is greatly shortened, truly realizing the modern management mode of unattended and intelligent operation and maintenance.
Conclusion
As can be seen from this benchmark aircraft coating project in Tianjin, choosing CADAIR for the AI intelligent VOCs treatment system is not only an upgrade at the equipment level, but also a transformation of the treatment philosophy from “passive compliance” to “active optimization”. The CADAIR Industrial Brain deeply integrates AI algorithms with more than ten years of waste gas treatment engineering experience, revitalizing the mature zeolite rotor + RTO process. While ensuring ultra-low emissions, it creates tangible energy-saving benefits for enterprises.
For enterprises also facing the challenge of high-volume coating waste gas treatment, this AI intelligent solution verified by 500+ days of actual combat is undoubtedly an optimal path that balances compliance and cost reduction.
