FCC three-volute ash hopper pressurizing agent line issues
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For heavy oil catalytic cracking (coaxial), what is the cycle time for the pressure agent in your three-spin ash hoppers? How to solve the problem of internal leakage in the valves on the pressing line? What material should be used for the valves on the pressing line? What measures can be taken to reduce valve wear? I hope to receive guidance from all the teachers!
Just add reverse airflow to ensure the valve opens and closes fully; don’t be lazy
Insert an orifice plate between the two valves every 7 days; the temperature at the lowest part of the storage tank should reach 100 degrees Celsius. Monitor the ash discharge time for each occasion
We have shifts almost every day, including midday and night shifts. The pressing time depends on the temperature; it is generally above 120 degrees. For valves, alloy valves made of 15CrMo should be used. The elbows in the pressing line tend to wear out easily, so it is best to use alloy elbows with a diameter of 12 cm or more, as these materials offer better wear resistance. After installing the elbows, it is advisable to carry out external welding to strengthen them and extend their service life. To prevent valve wear, it is necessary to control the opening degree of each valve – one valve should be adjusted to a specific opening level while the others should be kept fully open. The air flow rate should not be too high; just enough to ensure proper transportation is sufficient.