Process
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-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.
