100. What are the reasons and hazards of pouring recycled catalyst into the main fan?
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100. What are the reasons and hazards of pouring recycled catalyst into the main fan?
Reason: Mainly, it is due to excessively high pressure in the regenerator, or improper handling during the management of the main fan’s malfunction, with the damping valve at the fan outlet remaining open, which allows the regenerated catalyst to flow into the main fan. Hazard: The large amount of catalyst that enters the main fan can cause damage to the stationary and rotating blades, as well as severe damage to the shaft seals and bearings. Additionally, the high-temperature flue gas from regeneration entering the main fan can cause the casing to deform and the main shaft to bend, resulting in the shutdown of the installation.
It is mainly due to excessively high pressure in the regenerator, or improper handling during the management of the main fan’s runaway condition, with the damping valve at the fan outlet remaining open, which allows the regenerated catalyst to flow into the main fan. Consequences: The large amount of catalyst that enters the main fan can cause damage to the stationary and rotating blades, as well as severe damage to the shaft seals and bearings. Additionally, the high-temperature flue gas from regeneration entering the main fan can cause the casing to deform and the main shaft to bend, resulting in the shutdown of the installation.
The main fan is damaged. The operating temperature of the regenerator (dense phase) is generally 660–700°C, while the operating temperature of the main air stream is usually around 200°C. As for the exact design temperature of the main fan, it can be found in the fan’s manual; however, I believe it isn’t very high. The main fan cannot tolerate \"sand\"; if regenerated catalyst flows back into the main fan, it will quickly damage the fan’s casing and internal components. Moreover, the temperature of the regenerated catalyst is as high as 700°C (although this temperature may drop somewhat when it flows back into the main fan, it still doesn’t drop much).