Use and Maintenance of RTO Cellular Ceramic Regenerator
2023-09-13
The basic principle of using and maintaining RTO regenerative bodies is to oxidize organic waste gas into CO2 and H2O at high temperatures (>760℃) for removal. RTO uses ceramic regenerative bodies to maximize heat recovery and reuse, with a heat recovery rate greater than 95%.
The regenerative body is a key component. However, in practical applications, the lifespan of ceramic regenerative bodies is often unsatisfactory due to multiple reasons. The decline in the heat storage performance of ceramic regenerative bodies is reflected in the following aspects: 1. Damage. Flue gas and air repeatedly scour the regenerative body, causing frequent temperature changes in the ceramic regenerative body. At a certain point in the regenerative heat exchanger, the temperature periodically rises and falls rapidly by 100–200℃. This thermal shock damages the regenerative body material. Its resistance to rapid cooling and heating is often poor, leading to damage. 2. Burnout. In multi-chamber (two-chamber) regenerative heating furnaces, due to large nozzles for air and natural gas, the mixing of air and natural gas streams is not ideal, causing incomplete combustion. When residual air and natural gas mix in the narrow space of the regenerative body, secondary combustion occurs, damaging the regenerative body. 3. Melting and softening. Because the flue gas contains impurities such as iron oxide, continuous contact with the regenerative body under high-temperature combustion conditions forms low-melting substances, lowering the softening temperature of the material. Ultimately, the softened material blocks airflow channels, causing airflow obstruction. The decline in heat storage performance of the regenerative body directly manifests as: 1. Poor airflow, increased inlet and outlet pressure difference, increased main fan power, and increased frequency of the variable frequency drive. 2. Decline in heat storage performance (heat exchange performance), with increased flue gas temperature. (According to the chimney outlet display, normal temperature is 150℃; higher temperatures indicate reduced thermal efficiency.) 3. Increased natural gas consumption, usually compared by monthly total natural gas usage. Taking CH4 content as an example, when the organic waste gas concentration reaches 3%, the heat generated by combustion can maintain the energy balance between intake and exhaust flue gas. The burner only needs to operate during the RTO startup heating phase and remains off during normal operation.
Ruikai Environmental Protection --- RTO honeycomb ceramic regenerative bodies have significant advantages such as high temperature resistance, corrosion resistance, good thermal shock stability, high strength, large heat storage capacity, and good thermal conductivity.
Energy-saving effects and service life are greatly improved. In the heat storage heat exchange process of high-performance honeycomb regenerative bodies, the product of the regenerative body's mass density and specific heat capacity is larger, resulting in greater heat storage and release capacity. Combined with the switching cycle and service life, unit volume heat exchange area, and these parameters together complete the optimal choice of heat storage heat exchange technology. Frequent switching also affects the service life of honeycomb regenerative bodies and switching equipment. Regenerative bodies have advantages such as low pressure loss, large specific surface area, and fast heat transfer speed. Theoretically, regenerative combustion systems using high-performance honeycomb regenerative bodies are easier to retrofit to existing furnaces and have higher heat recovery efficiency. Honeycomb regenerative bodies have strong adaptability and long service life.
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