Thermal Oxidation
Recuperative Thermal Oxidation
Recuperative thermal oxidation is a highly efficient process that cleans industrial exhaust air by destroying hazardous air pollutants (VOCs and HAPs) and eliminating unpleasant odors. The system is also well suited for processes where particulate matter and aerosols are generated. An integrated metallic shell-and-tube heat exchanger enables efficient primary heat recovery.
Very High Destruction Efficiency
Thanks to very high destruction efficiencies of up to 99.9%, the Envanio system ensures compliance with strict environmental regulations and emission limits.
Multi-Stage Heat Recovery
The system operates economically when downstream secondary heat recovery returns captured thermal energy directly to your production process.
Compact & Rugged Design
Envanio’s compact, heavy-duty design provides a space-saving lightweight footprint built for a long operational service life.
Energy-Efficient Purification of Low Air Flow Rates with Highly Fluctuating or High VOC Concentrations
| Process | Thermal Oxidation |
|---|---|
| Air Flow Rate | 1.000 Nm³/h to 40,000 Nm³/h |
| Solvent Concentration | up to 10 g/Nm³ |
| Exhaust Gas Temperature | up to 320 C° |
| Destruction Efficiency | up to 99.9% |
| Thermal Efficiency | up to 70% |
| Energy Sources | Natural gas, liquefied petroleum gas, heating oil, liquid organic fuels |
Each system is custom-designed based on your requirements and processes.
The Design of Our Recuperative Thermal Oxidizers
Envanio’s recuperative thermal oxidation system consists of a combustion chamber, a highly efficient burner continuously refined by Envanio, and an integrated shell-and-tube heat exchanger for preheating the exhaust air. To meet varying process requirements, we offer a range of burner models with specialized features and functions. The system’s design is engineered to withstand thermal expansion, ensuring a long service life and low maintenance requirements.
Superior Envanio Burner Technology
Envanio’s latest generation of burners features hollow-cylinder flame technology, which achieves superior clean-gas emission values while operating at lower combustion chamber temperatures. The custom gas nozzle geometry, developed specifically for our recuperative thermal oxidation systems, ensures exceptional mixing of fuel gas and process air. The burner is available as a standard gas burner, a dual-fuel burner for two types of gas, or a combination gas-oil burner.
Typical Applications for Recuperative Thermal Oxidizers
Envanio designs and builds air pollution control systems tailored to your facility’s production processes. With high purification efficiency and rugged construction, recuperative thermal oxidizers are ideal for the following applications.
- Automotive Industry View Industry This system is frequently used in automotive paint shops, where the thermal energy recovered from exhaust air treatment can be returned directly to heat and operate the drying ovens.
- Surface Treatment View Industry This system is commonly used in coating facilities for flooring or wallpaper where silicone-based coating or varnishes are used. In these processes, the system’s high cleaning efficiency and robust resistance to silica deposits provide dependable, long-term operation.
360° Service for Your Air Pollution Control System
Take advantage of our 360° support for air pollution control systems from Envanio or third-party manufacturers. Our service teams support your plant throughout the entire equipment lifecycle, providing routine inspections, preventative maintenance, system audits, efficiency retrofits, repairs, and genuine replacement parts.
FAQ
The use of recuperative thermal oxidation systems is recommended when destruction efficiency, dependable process reliability, and flexibility in handling diverse pollutants are required. The system is particularly effective when high VOC loads must be treated safely and reliably. When VOC concentrations, exhaust air flow rates, or pollutant compositions vary widely, a TNV system often performs far more robustly than biological or adsorptive processes.
More Ways to Treat Exhaust Air
To deliver solutions tailored to your specific requirements and varying operating conditions, Envanio offers a wide range of standard and custom-engineered air pollution control systems based on thermal oxidation.
Regenerative Thermal Oxidation
Regenerative thermal oxidation (RTO) is a highly efficient process that cleans industrial exhaust by destroying hazardous air pollutants (VOCs and HAPs) and eliminating unpleasant odors. By using internal ceramic heat exchange media, the system traps and recycles its own heat, making the entire purification process incredibly energy efficient.
Electric Regenerative Thermal Oxidation
Envanio's electrically heated regenerative thermal oxidizer (eRTO) combines high VOC destruction efficiency, operational reliability, and exceptional energy performance. By using electric heating elements instead of gas-fired burners, the system avoids combustion-related byproducts and significantly reduces NOₓ emissions. The result is a cleaner, more sustainable solution for industrial air pollution control.
Direct Fired Thermal Oxidation
Direct fired thermal oxidation is a highly efficient process that cleans industrial exhaust by destroying hazardous air pollutants (VOCs and HAPs) and eliminating unpleasant odors. The system is particularly well-suited when heavily contaminated exhaust streams must be treated reliably with high removal efficiencies, and when complex heat recovery systems are not economically feasible.
VOC Concentration
Envanio’s VOC concentration process uses adsorption to concentrate dilute solvent emissions. For cost-effective air pollution control, adsorption is recommended first to concentrate large exhaust airflows with low pollutant loads. The concentrated exhaust air is then routed to downstream recuperative or regenerative thermal oxidation for highly energy-efficient destruction.
Activated Carbon Adsorption
Envanio’s activated carbon adsorption is based on the physical adsorption process to purify industrial process air of volatile organic compounds (VOCs) and hazardous air pollutants (HAPs) from industrial exhaust air, with the option for solvent recovery. In our regenerative systems, both the adsorbent and solvents are recovered for reuse, while in non-regenerative systems, the spent activated carbon is safely disposed of or replaced along with the captured pollutants.
Catalytic Hot Gas Filtration
Envanio’s catalytic hot gas filtration is based on an integrated 3-in-1 process for industrial hot gas and exhaust air purification. Rigid, high-temperature ceramic filter elements enable the simultaneous removal of particulate dust, heavy metals, sulfur oxides (SOx), and nitrogen oxides (NOx) from process exhaust in a single compact system.
Wet Scrubbing
Envanio’s wet scrubbers rely on absorption for the wet separation of inorganic compounds, particulates, mist, and acidic gases. During the regenerative or direct-fired thermal oxidation of halogenated hydrocarbons or sulfur compounds, substances such as hydrogen halides or SOx are generated, which must be scrubbed from the exhaust air in a downstream wet scrubber.
Liquid Distillation
Envanio’s distillation systems efficiently separate solvents from water and split complex solvent mixtures into reusable components. Integrated recovery processes reduce raw material consumption and operating costs, with flexible designs for batch or continuous operation.
