Regenerative Thermal Oxidizer (RTO)
Innovative rotary valve design features a compact structure, minimal footprint, and heat recovery efficiency exceeding 95%. It is ideally suited for large-scale continuous-production facilities in industries such as surface coating, packaging printing, and automotive painting. The equipment operates smoothly, requires simple maintenance, and represents the optimal solution for treating high-volume exhaust gases.
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Keywords: Regenerative Thermal Oxidizer (RTO)
Regenerative Thermal Oxidizer (RTO)
1. Product Introduction
Regenerative Thermal Oxidizers (RTOs) with a rotary heat storage design are suitable for treatment systems ranging from 5,000 to 100,000 Nm³/h. This configuration features a more compact footprint than conventional tower-type RTOs, while also delivering superior energy efficiency thanks to the use of a unique rotary valve that enhances heat recovery and minimizes exhaust gas carryover during valve switching, thereby improving overall energy savings and emission performance. With exhaust gas purification efficiencies as high as 99%, rotary RTO systems represent the most advanced and cost-effective exhaust gas treatment technology available today.
2. Process Principle
① involves heating organic waste gas to above 760°C and maintaining a residence time of more than 1 second, thereby oxidizing and decomposing the VOCs in the waste gas into carbon dioxide and water.
② The high-temperature flue gases generated during oxidation flow through specially designed ceramic heat-storage units, raising the temperature of the ceramics and “storing heat.” This stored heat is then used to preheat the organic waste gases entering the furnace subsequently, thereby reducing fuel consumption for heating the waste gases and lowering operating costs.
③ The ceramic heat storage units shall be divided into three zones, with each heat storage chamber sequentially undergoing the cycles of heat storage, heat release, and cleaning, repeating continuously. Immediately after a chamber completes the “heat release” phase, an appropriate amount of clean air shall be introduced to purge that chamber (to ensure a VOC removal efficiency of at least 99%), and only after the purging is completed may the chamber proceed to the “heat storage” phase.
④ During cold-start preheating, the burner system is used to raise the furnace temperature; under normal operating conditions, most of the heat is recovered by the heat-storage ceramic beds. When the concentration of combustible components in the exhaust gas is too low, auxiliary fuel (natural gas) is burned to increase the furnace temperature. Conversely, when the furnace temperature becomes excessively high, a high-temperature vent valve controlled by the furnace temperature is opened to release a portion of the heat.
3. Process Flow Diagram
4. Performance Characteristics
- Stable heat exchange, excellent air tightness, high heat recovery efficiency, and reduced operating costs.
- Small footprint; no restrictions on installation space.
- Modular design with a short installation period.
- Automated operation, with comprehensive monitoring of multiple system components—including inlet and outlet points, the combustion chamber, and regenerative heat exchangers—ensures safe and stable equipment performance.
- Fewer equipment failures and lower subsequent maintenance costs.
| Regenerative Thermal Oxidizer (RTO) | Traditional Tower-Type RTO |
| Leak-free | Valves are prone to leakage and gas crossover. |
| The rotary valve rotates continuously, ensuring smooth airflow and low noise. | The lift valve exhibits significant vibration, and the airflow is pulsating intermittently. |
| Single-valve control is simple, and the system operates stably. | Multiple valves operate in coordination, resulting in numerous control points and a higher likelihood of malfunctions. |
| Contactless airtight design and gear transmission for durability. | Rubber ring sealing is prone to corrosion and wear, and can crack upon impact. |
| Intermittent heat storage and release by the thermal storage medium extends its service life. | Frequent heat release and heat storage by the thermal storage unit shorten its service life. |
| High-strength corrugated panel housing design, accommodating thermal expansion and contraction. | Shell stiffening ribs cannot relieve thermal expansion stresses. |
| Compact design, occupying one-third less space and weighing one-third less. | Low material utilization, large footprint, and bulky. |
5. Scope of Application
①It can be widely used in the spray coating and painting of 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 the printing and dyeing industries; in the coating and spray painting of building materials, decorative materials, and furniture; and in the pharmaceutical, food, and additive industries.
② Airflow: 5,000–100,000 Nm 3/h
③ Concentration: 1000 mg/m 3
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