Coil Coating Line with Regenerative Thermal Oxidizer and Multistage Heat Recovery
Executive Summary
Epcon engineered a complete coil coating line solution that replaces an outdated direct-fired afterburner with a high-efficiency Regenerative Thermal Oxidizer (RTO) paired with both primary and secondary heat-recovery systems. The new system treats VOC-laden exhaust from the coating process, recovers a large portion of thermal energy, and dramatically reduces fuel consumption — delivering substantial annual energy savings while meeting emissions compliance and sustaining high line speeds.
Project Overview
A coil-coating facility, producing coated metal coils at line speeds up to 700 ft/min through a 100-ft curing oven, was relying on a direct-fired afterburner (incinerator) plus partial exhaust-gas reuse for oven heating. The system was energy-inefficient, costly, and environmentally outdated. Epcon was contracted to engineer a more advanced emission-control and thermal-recovery solution: a regenerative thermal oxidizer combined with a multistage heat-recovery configuration to replace the afterburner, improve energy efficiency, and ensure compliance with air-emissions standards while supporting continuous high-speed production.
The Challenge
Key challenges the customer faced:
- The existing direct-fired system consumed very high fuel energy to sustain the curing oven while handling VOC emissions from the coil coating process.
- Operating at high line speeds (700 ft/min) required reliable, continuous exhaust treatment and thermal supply without production slowdowns.
- The coil coating exhaust contained volatile organic compounds (VOCs) requiring abatement to meet environmental regulations.
- The facility wanted to recover as much waste heat as possible to lower operating costs and improve sustainability.
- The solution needed to fit into the existing plant layout and handle large airflow volumes typical for coil-coating exhaust.
Engineering Requirements
To meet performance, environmental, and economic goals, the system needed to deliver:
- A Regenerative Thermal Oxidizer (RTO) sized for high-volume exhaust flow (sufficient SCFM for coil coating line throughput)
- Primary and secondary heat-recovery exchangers to maximize reuse of thermal energy from oxidizer exhaust
- Continuous, reliable operation to match the high-speed coil coating line (700 ft/min) and long curing oven length (100 ft)
- Sufficient VOC abatement performance to meet regulatory air-quality standards while ensuring thermal efficiency
- Integration with existing curing ovens and exhaust ducting, minimizing modifications and downtime
- Long-term durability and stable operation under industrial conditions
The Solution
Epcon designed and delivered a fully integrated coil coating line emission-control and energy-recovery system, featuring:
- A Regenerative Thermal Oxidizer (RTO) replacing the old afterburner, optimized for the coil coating exhaust composition and volume
- Primary heat exchanger to preheat incoming exhaust air using stored heat from ceramic media — increasing thermal recovery efficiency and reducing fuel demand
- Secondary heat-recovery exchanger, which channels remaining waste heat to support the curing oven or other plant processes, maximizing energy reuse and minimizing waste
- System design tailored for the existing coil-coating line (100 ft oven, 700 ft/min line speed), ensuring compatibility with production flow and minimal disruption during installation
This combined RTO + multistage heat-recovery design enabled the plant to treat emissions and massively cut fuel consumption — while maintaining or improving production throughput.
Technical Specifications
Oxidizer Type: Regenerative Thermal Oxidizer (RTO)
Airflow Capacity: 45,000 SCFM (designed for the coil coating exhaust load)
Heat Recovery: Primary + Secondary heat-exchanger configuration for maximum thermal efficiency and reuse
System Application: Coil coating line VOC exhaust abatement + energy recovery for curing ovens / plant processes
Line Speed Compatibility: Up to 700 ft/min through 100 ft curing oven
Thermal Efficiency Target: High efficiency typical of RTO systems (heat recovery range between 80–95% for ceramic-media RTOs)
The Results
After installing the new system, the customer achieved:
- Dramatic fuel savings: Fuel consumption dropped from 40 million BTUs/hour under the old direct-fired afterburner to just 16 million BTUs/hour with Epcon’s RTO + heat-recovery system — a reduction of 24 million BTUs/hour, equating to approximately 210 billion BTUs saved annually.
- Substantial energy efficiency and operating cost reduction, thanks to primary and secondary heat recovery and efficient oxidizer operation.
- Effective VOC abatement and emissions control, improving environmental performance and regulatory compliance by using the RTO instead of the direct-fired afterburner; delivering reliable air-pollution control across continuous high-volume operations.
- Maintained or increased production capacity: the system supports high line speeds (700 ft/min), ensuring no loss in throughput while improving the overall environmental and economic performance.
Learn More
Epcon specializes in designing and manufacturing advanced emission-control and heat-recovery systems for coil-coating, finishing, and industrial coating operations. Our integrated RTO + multistage heat-recovery solutions deliver compliance, energy efficiency, and operational savings — even in high-volume, continuous production environments.
Contact our engineering team to discuss a custom RTO + heat-recovery system for your coil-coating or coating-line application.
