Regenerative Thermal Oxidizers Explained

Regenerative Thermal Oxidizers destroy Unstable Organic Compounds (VOCs) and Hazardous Air Pollutants (HAPs), which can be created by chemical processes, and industrial exhaust steams. This type of oxidizer uses extremely high heat, about 1500°F, to clean the exhaust of dangerous pollutants and compounds. Developed for big volumes, and low VOC focus air pollution applications, Regenerative Thermal Oxidizer technology is predicated on using ceramic media as heat exchangers, and switching values. This design contrasts with Recuperative Thermal Oxidizers which use metallic shell and tube heat exchanger technology, with major and/or secondary heat. In this configuration, among different distinctions, the outgoing clean process stream of the secondary heat exchanger process is routed to a different a part of the plant for its use or back to the process itself.

RTO technology delivers low operating costs for high air stream, low unstable natural compound (VOC) fume streams. Somewhat than allowing the clean hot air to exhaust to environment, the RTO unit captures up to ninety five% of the heat previous to exhausting it to atmosphere.

How Does the RTO Process Work?

Step 1: The RTO unit is introduced as much as combustion temperature using supplemental fuel equivalent to natural gas, propane, diesel or bio-fuel. Throughout this start up period, the RTO unit initially purges itself with fresh air and continues to process fresh air till it reaches combustion temperature equilibrium. The RTO unit is now ready to switch over to process air and begin the thermal oxidation of VOC with destruction efficiency up to 99%.

Step 2: The RTO switches from start-up mode running on clean air to operating on VOC process air from the source. To maximize heat recovery, the RTO will automatically cycle or alternate the inlet and outlet (see diagrams beneath) by way of a collection of pneumatic valves.

Because the RTO is so environment friendly at reclaiming effluent heat, the units usually times are capable of sustaining combustion temperatures without any supplemental fuel, using the VOC as the only supply of fuel.

Two of the commonest sizing configurations for Regenerative Thermal Oxidizers are two-canister and three-canister.

Two Canister:

Two-canister Regenerative Thermal Oxidizers have a low CAPEX and more efficient upkeep, while generating a DRE up to 98-99%. In a -can RTO, the exhaust stream, laden with VOCs, is fed into the first heat change bed, utilizing a high-pressure fan system. There, it passes directly by way of the media, where it begins the heating process. It then enters the combustion chamber, where burners heat the stream to the optimal temperature for combustion, to complete the oxidization process. Once this step is completed, the now clean stream filters into the second heat exchange bed, to be cooled. This clean stream passes by means of one other bed of media, which brings the temperature of the stream down, and the temperature of the media up. The clean and cooled stream is then launched into the atmosphere.

Three Canister:

Three-can RTO systems are the most effective solution for vapor-tolerant and aqueous applications. The high DRE, in extra of 99%, ensures the odor and natural materials is sort of completely destroyed. Through this process, the RTO converts the pollutants within the stream into carbon dioxide, and water vapor, all while recovering thermal energy that may very well be used to reduce the cost of working the equipment. The process in which this is achieved is very similar to that of a two-canister RTO. The exhaust stream, laden with VOCs, enters the heat change bed utilizing a high-pressure fan system. Here, the stream passes directly by way of the media, heating it in preparation for the combustion chamber. The combustion chamber then heats the stream further, utilizing burners, to the optimum temperature for combustion, to complete the oxidization process. After that, the clean stream is lead to the heat recovery chamber, where it passes by way of the media bed, which cools the air, and heats the media. The final step, which makes the 3-can regenerative thermal oxidizer more environment friendly, occurs within the remaining chamber, which traps any remaining VOC’s in the “clean” stream, by purging the stream with clean air. This last step is just not available in a 2-can RTO, which is why a 3-can RTO can achieve a slightly higher DRE.

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