The QUADRANT NRV Thermal Oxidizer is a market driven answer to a unique air pollution problem. Highly concentrated vent gas emissions are common among the petro-chemical, chemical processing, and pharmaceutical industries. These emissions are typically low in volume but very high in concentration. Typical answers to these emissions have included inefficient and dangerous flare technology. The QUADRANT NRV Thermal Oxidizer is a much safer, more efficient, and more versatile treatment technology that is guaranteed to meet your air pollution control needs.


    Catalytic Products International is continuing our 48 year history of providing innovative air pollution control solutions with a line of highly flexible and very efficient thermal oxidizers. QUADRANT-NRV Thermal Oxidizers routinely exceed all worldwide regulatory requirements while providing a level of sophistication that is unmatched in our industry. In today's ever tightening regulatory climate traditional technologies such as scrubbers, strippers, flares, and the like cannot achieve consistent ultra high VOC elimination at an economical installed cost. Low cost - High Performance - Long Life are the key advantages of our QUADRANT NRV-Thermal Oxidizers.

    QUADRANT NRV 3,000 SCFM - Plastic Recycling-1QUADRANT NRV-Series Systems work by sending the off gas emissions (rich in concentration) as a fuel directly through our special burner system. This unique combustion system is safe and reliable throughout a wide range of conditions. The NRV system can process LEL ranges from 0 to over 100% without any compromise in safety or efficiency. A combustion air blower is used to control combustion temperature throughout the ranging conditions often presented by reacting processes. The NRV system is a simple design, rugged in construction that promises a long and useful life.

    The process begins by flowing natural gas into a pilot burner and lighting it. Once the flame has been ignited, more natural gas is piped into the "Hold" burners, as well as the main gas burners. The Main gas burners ignite, and once the temperature increases, pilot is deactivated.

    As the internal temperature within the combustion chamber increases, combustion air is blown into the system. Some of the combustion air is forced into the venturi system, where it mixes with the natural gas. The rest of the combustion air is driven directly into the combustion chamber, where it helps both to ensure there is enough oxygen content to support oxidation as well as to help maintain combustion chamber temperature.

    Once the QUADRANT NRV has reached operating temperature, process gases are now released into the burner assembly, rather than over it as in other thermal oxidizers. As these gases are released from the process gas nozzles, they interact with the flame from the hold burner and main gas burner, and ignite, adding still more heat to the combustion chamber.

    Sensors in the combustion chamber constantly monitor temperature, allowing the PLC to control how much heat is being produced. As the gases heat up, the PLC reduces the amount of natural gas being used, allowing the process stream to be the main fuel source for the oxidizer. It also increases the amount of combustion air being used to help maintain temperature. The same also happens in reverse: If the temperature begins to fall, the main gas use increases, and the combustion air blower decreases.

    As long as the air stream being delivered to the NRV is rich in VOCS or other volatile chemicals, the system uses only enough natural gas to keep the hold burners lit. This allows the system to maintain flame on the burner assembly even if there is a sudden drop in VOC concentration. This feature is what allows the VOC to be more fuel efficient than an enclosed flare or a more typical thermal oxidizer.


    All QUADRANT NRV-systems incorporate a proven round design which protects against stress and fatigue commonly found in other systems that utilize an antiquated "square box" design. Damaging thermodynamic stress inherent in every thermal oxidizer is eliminated with the QUADRANT NRV-Thermal Oxidizer and its round design.

    Turbulating Combustion Chamber

    Turbulating Combustion Chamber

    One of the most unique features found in any QUADRANT system is the Turbulating Combustion Chamber, working with our Venturi Burner System. This pairing of components has paved the way for QUADRANT systems to operate at the lowest temperatures while still providing the highest VOC destruction. Faced with today's compliance requirements the old design strategies of time and temperature are not enough. Only the QUADRANT system, by maximizing turbulent mixing, flame impingement, and temperature uniformity can assure users of low cost and ultra high destruction. QUADRANT systems have passed compliance tests worldwide, at lower combustion chamber temperatures than expected and even lower than we guarantee!!
    Venturi Burner System

    Venturi Burner System

    The combustion system in the QUADRANT NRV Thermal Oxidizer is designed to safely process your waste stream directly as a fuel. This saves in overall size of the system, minimizes supplemental fuel consumption, and makes for a very economical pollution control system. The Venturi Burner System is made of ceramic venturi tiles that distribute and inject the gases into the Turbulating Combution Chamber. All gas handling equipment, valving, and flame arrestors are supplied to meet the highest safety levels.
    Insulating Systems

    Insulating Systems

    All QUADRANT NRV-systems utilize a specialized insulation system that will retain heat for low cost and cool shell temperatures, while allowing fast startups and long equipment life. The insulation system works in conjunction with the round design to eliminate fatigue for industry leading uptime reliability and the lowest maintenance costs.
    Temperature Safety System

    Temperature Safety System

    Every QUADRANT NRV-Thermal Oxidizer is integrated with our customized PLC-control panel called TSS. TSS communicates with the QUADRANT and your process for optimal performance, safety, and reliability. TSS optimizes the systems efficiency by managing temperatures, controlling drive, and positioning valves. This user friendly system provides automated operations, one button start - stops, self diagnostics, and data monitoring options for simplified maintenance and compliance verification.
    QUADRANT NRV systems offer these standard features:

    QUADRANT NRV systems offer these standard features:

    •  Air volume capacities up to 50,000 scfm
    • VOC destruction up to 99.99%
    • High volumetric turndowns
    • Automatic volume control
    • Automated operation via TSS control systems
    • Pre-piped and wired components
    • Compact design with installation flexibility
    QUADRANT NRV Systems offer these optional features:

    QUADRANT NRV Systems offer these optional features:

    • Variable frequency drives
    • Tandem set-up for multiple QUADRANT installation
    • Infinite process volumetric turndowns
    • SD (Severe Duty) series system for corrosive air streams
    • Multiple fuel blends or oil fired combustion systems
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