How does a regenerative thermal oxidizer work?

A Regenerative Thermal Oxidizer (RTO) works by pushing a pollutant-crammed airstream via the oxidizer, normally with a system fan (1). The flow of air is managed by valves (2) that direct this airstream into one of recovery (beds) chambers (three). In a regenerative oxidizer, a minimal of two beds of ceramic media (saddles, and/or structured media block) is utilized to seize heat and launch heat to the polluted airstream.

Because the dirty air passes via the primary media bed, the air absorbs heat from the hot ceramic media beds. The air exits the primary media bed and enters the combustion chamber (four) the place oxidation happens at high temperatures (>1500ºF), at a set temperature (>1500F) for a desired dwell time (>0.5 seconds) to transform over 98% of the VOCs to carbon dioxide and water vapor. This sizzling, clean air then continues by a second ceramic media bed (5). As the air passes through the bed it releases heat into the ceramic media. The cooled, clean air is then exhausted to the atmosphere (6).

The valves change direction every couple of minutes reversing the flow direction via the RTO to transfer the heat to the opposite bed, which offers the RTO its high fuel effectivity and low working costs

Thermal oxidizers reduce air air pollution emissions emanating from quite a lot of industrial processes. The exhaust airflows in industrial applications may have particulate matter (PM) or dense concentrations of Volatile Organic Compounds (VOCs), which thermal oxidizers rework into an innocuous emission of water vapor, carbon dioxide, and heat.

What’s a Thermal Oxidizer?

Conceptually a thermal oxidizer is a burner in a box that inputs contaminanted airstreams from industrial processes. The mechanism of thermal oxidation is a combustion process that interacts the exhaust gas with oxygen in a temperature controlled environment. The contaminants undergo a chemical oxidation reaction, leading to their destruction before discharging into the atmosphere. The output of a thermal oxidizer is an innocuous emission of carbon dioxide, water, and heat.

Regenerative thermal oxidizers (RTO) operate in phases, namely the pollutant destruction part and the clean air cycle. In what follows we describe the input to the regenerative thermal oxidizer process, transformation of polluted waste into an innocuous mixture of carbon dioxide, water, and heat, and the output purified air.

Pollutant destruction section

The pollutant destruction section commences the regenerative thermal oxidation process, whereby a high pressure provide fan forces exhaust fumes from industrial processes into the oxidizer because the input. The input pollutant laden airstream is guided into an energy recovery canister by an inlet switch valve. Afterwards the airstream continues on a path from the valve assembly to the first heat exchanger. Because of thermodynamic and chemical effects energy is transferred to the airstream from the ceramic media, causing the particles in the airstream to move with great velocities. This improve in temperature is thought to be airstream preheating before arrival to the combustion chamber. As the air moves into the combustion chamber it becomes trapped, and the temperature of the air will increase leading to a chemical reaction known as thermal oxidation. Thereby the contaminents in the air are destroyed, while within the combustion chamber.

Clean air cycle

In the second section of the thermal oxidizing process the purified air is directed out of the combustion chamber and right into a second energy recovery canister. The air is at a higher temperature than the ceramic media within the canister, thus the media acts as a heat reservoir. In different words energy within the type of heat is switchred from the air to the ceramic media. The last step entails reemission of the purified air into the atmosphere. An outlet switch valve directs the clean air by means of an exhaust stack and back into the atmosphere. The regenerative thermal oxidizer process has the advantageous property of achieving high and reliable thermal energy efficiencies, as well as optimum destruction efficiences over 99%.