Regenerative Thermal Oxidizers

Regenerative Thermal Oxidizers

A regenerative thermal oxidizer (RTO) is a type of air pollution control equipment that destroys hazardous air pollutants (HAP), volatile organic compounds (VOC) and odorous emissions created throughout industrial processes. RTOs are the commonest air air pollution control technology in use today.

RTO technology makes use of combustion at high temperatures to oxidize air pollutants from industrial exhaust streams, which turns them into CO2 and H2O earlier than they’re released into the atmosphere. The time period "regenerative" in regenerative thermal oxidizer comes from the ceramic media heat exchanger, which retains heat from the prior combustion cycle to preheat (and partially oxidize) the pollutant-stuffed airstream for the next cycle.

Because RTOs have heat recovery of 95% as an trade customary, they've the lowest operating value of all thermal oxidizer systems – not to point out the longest service life and highest reliability. Regenerative thermal oxidizers are ideal for process streams with high air circulate and low VOC content material, achieving VOC destruction of 99%+. It’s even potential for an RTO to operate with no auxiliary fuel use in any respect if process VOC concentration levels are >/three-four% decrease explosive limit (LEL).

(1) A regenerative thermal oxidizer (RTO) works by pushing a pollutant-crammed airstream via the oxidizer, usually with a system fan.

(2) The move of air via the RTO is managed by valves that direct the airstream into one in every of two heat exchangers (chambers containing ceramic media beds).

(3) RTOs have a minimum of beds of ceramic media (saddles and/or structured media block) used as heat exchangers. As dirty air passes through the first media bed, it absorbs heat from the recent ceramic media, then enters the combustion chamber.

(4) In the combustion chamber, dirty air is held at temperature (>1500°F) for a selected dwell time (>.5 seconds). This oxidizes VOCs and HAPs into carbon dioxide and water vapor.

(5) Hot, clean air exits the combustion chamber and moves into the second ceramic media bed which absorbs the heat for reuse.

(6) Cooled, clean air is then exhausted into the atmosphere.

The valves (2) change direction every couple of minutes which reverses the flow direction, so the heat switch alternates between the 2 ceramic media beds. This is what gives RTOs their high fuel effectivity and low operating costs, making them highly desirable VOC abatement systems.

Time, Temperature & Turbulence
Time, temperature and turbulence – aka "The Three T’s"- are critical and co-dependent factors that determine regenerative thermal oxidizer performance.

Time: When airflow is fixed, larger combustion chambers provide longer dwell times. For many applications the dwell time is between .5 and 1 second.

Temperature: The RTO combustion chamber maintains a temperature over 1500°F, which is essential for efficient VOC destruction.

Turbulence: VOCs should combine with ample heat and oxygen to set off the chemical reaction (oxidation) that breaks them down into carbon dioxide and water. RTO designs facilitate turbulence to make sure thorough mixing of the polluted process air, rising VOC destruction efficiency.
 
 
 
Carpenteria Pasqualin
via Madonnina 63 - 35030 - Rovolon - PADOVA  - P.IVA 00363330283
Tel 049.5226260 - email: info@carpenteriapasqualin.it 
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