Three-bed RTO
This system employs a three-bed regenerative thermal oxidation technology, achieving VOC removal efficiencies of over 99% while delivering stable and reliable operation. It is ideally suited for treating medium- to high-concentration exhaust gases in industries such as petrochemicals, packaging and printing, pharmaceuticals, and automotive coatings. With its high heat recovery efficiency, the equipment significantly reduces operating costs, enabling customers to simultaneously meet environmental compliance requirements and achieve economic benefits.
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Keywords: Three-bed RTO
Three-bed RTO
1. Product Introduction
The three-bed regenerative thermal oxidizer (RTO) is a medium- to low-concentration organic waste gas treatment system that features the lowest operating energy consumption and exceptionally high removal efficiency. Compared with conventional catalytic combustion, direct-fired thermal oxidizers (TO), and two-bed regenerative thermal oxidizers, it offers superior thermal efficiency (95%), lower operating costs, and the ability to treat large volumes of low-concentration exhaust gases. Moreover, when the concentration is slightly higher, secondary waste heat recovery can be implemented, further reducing production and operational expenses.
2. Process Principle
The low-temperature organic waste gas to be treated enters the ceramic media layer of heat storage chamber A under the action of the inlet fan. (This ceramic media has already “stored” the heat from the previous cycle.) As the ceramic releases heat, its temperature drops, while the organic waste gas is heated to a higher temperature before entering the combustion chamber. In the combustion chamber, the burner combusts fuel and releases heat, raising the waste gas temperature to the set oxidation temperature of 760°C, at which the organic compounds in the waste gas are decomposed into CO₂ and H₂O. Because the waste gas is preheated by the heat storage chambers, the oxidation process itself also releases a certain amount of heat, thereby reducing the amount of fuel required by the burner. The oxidation chamber serves two purposes: first, to ensure that the waste gas reaches the set oxidation temperature; and second, to provide sufficient residence time for complete oxidation of the waste gas. After the waste gas is converted into purified high-temperature gas, it exits the combustion chamber and enters heat storage chamber C (where the ceramic media from the previous two cycles have already been cooled and purged), where it releases heat and its temperature decreases before being discharged. Meanwhile, the ceramic in heat storage chamber C absorbs heat and stores a large amount of thermal energy (to be used for heating in the next cycle). Heat storage chamber B is
During this cycle, the purging function is executed. Upon completion, the inlet and outlet valves of the heat storage chambers are switched: Heat Storage Chamber C takes in air while Heat Storage Chamber B exhausts air, and Heat Storage Chamber A undergoes purging; in the subsequent cycle, Heat Storage Chamber B takes in air, Heat Storage Chamber A exhausts air, and Heat Storage Chamber C undergoes purging, with this alternating sequence repeating continuously. When the RTO unit has not yet reached operating conditions or is shut down, the waste gas can temporarily be diverted through a bypass and discharged directly into the stack.
To promote environmental protection and energy conservation, a heat exchanger can be installed at the outlet of the RTO to recover waste heat.
3. Process Flow Diagram
4. Performance Characteristics
- Can handle virtually all exhaust gases containing organic compounds.
- Capable of handling large air volumes and organic exhaust gases of varying concentrations.
- The organic waste gas flow rate handling range is very wide (nominal flow rate: 20%–120%).
- It can adapt to variations and fluctuations in the composition and concentration of VOCs in organic waste gases.
- Insensitive to small amounts of dust and solid particles entrained in the exhaust gas.
- It boasts the highest thermal efficiency (>95%) among all thermal combustion purification methods.
- Self-heating operation can be achieved without the addition of auxiliary fuel under appropriate exhaust gas concentration conditions.
- High purification efficiency (three-chamber > 99%)
- Low maintenance workload and safe, reliable operation
- Organic deposits can be removed periodically, and the heat storage medium is replaceable.
- The entire device exhibits low pressure loss.
- Long service life of the equipment
5. Application Areas
It can be widely used in spray coating and painting for automobiles, vehicles, shipbuilding, and industrial products; in the petroleum, chemical, ink, and dye industries; in the rubber and plastics, leather, adhesive tape, cable, enameled wire, electronics, and printed circuit board industries; in printing, packaging, metal coil coating lines, laminating lines, tinplate printing and can manufacturing, and textile dyeing and printing; in the coating and spray-painting sectors for building materials, interior decoration, and furniture; as well as in the pharmaceutical, food, and additive industries.
6. Applicable exhaust gases:
Types of organic waste gases used: alkanes, alkenes, alcohols, ketones, ethers, esters, aromatics, benzene derivatives, and other hydrocarbon-based organic waste gases.
Low-concentration organic compounds (simultaneously meeting the criterion of less than 25% LFL) and high air volume
The exhaust gas contains a variety of organic components, or the organic components frequently change.
Waste gas containing components that readily cause catalyst poisoning or deactivation
Not suitable for exhaust gases containing high levels of silicone resin.
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