Continuous reforming catalyst lift pipeline
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Is it necessary to add heat tracing to the lift pipeline? During the lifting process of the catalyst, from the regenerator lifter to the reduction tank, will hydrogen be oxidized to form water? This is related to the adhesion of the catalyst being lifted
The regenerant lift gas is generally hydrogen at 150 degrees; only insulation is required, no heat tracing is needed； At 150 degrees, no reduction reaction occurs essentially, so no water is produced.
What is the typical pressure difference from the regenerator lift to the reduction tank?
If adjusting the catalyst circulation rate, it can only be done by adjusting the circulation speed in the CRCS system, right? Can this pressure difference be adjusted?
This differential pressure serves as the secondary loop of the circulation rate control scheme; normally, it should be the deviation between the setpoint for the circulation rate and the actual average circulation rate that determines the value of this differential pressure. However, when initially conducting catalyst promotion experiments, the differential pressure can also be automatically controlled to set a value for the secondary gas supply. This control is a three-stage cascade control; automatic operation can be enabled from bottom to top. The only issue is that when differential pressure is used for automatic control, the fluctuations in the cascade circulation rate become significant
Is the adjustment of the circulation rate determined by the level of material in the regenerator? The material level is high; should the circulation rate be increased?
No, the circulation rate is equivalent to the processing capacity of the regenerator’s coking reaction, and it must remain stable； The regenerator level is adjusted by the catalyst lift system at the bottom of the reactor.
When the material level is high, it’s controlled by adjusting the amount of secondary air, right? Should the circulation rate be determined based on the coke content in the catalyst to be regenerated?
Here, it’s usually 20-30 kPa