Catalytic coaxial two-device differential pressure problem
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Recently, the temperature has been rising gradually. The cooling effect of the oil and gas at the fractionation stage is poor, which results in very high pressures in the settler (175 kPa) and in the regenerator (185 kPa). The pressure difference between these two units is nearly 10. Isn’t this a significant safety hazard? What is the pressure difference limit for those two devices for teachers? What should be taken into consideration when operating under such conditions?
This post was last edited by Refiner on 2016-6-16 at 13:46. Maintaining the differential pressure between the two vessels within a certain range is intended to prevent backflow of the catalyst and ensure its proper fluidization. In coaxial systems, the pressure buildup in the stripping section and the raw catalyst riser is relatively high, so the likelihood of backflow is lower; as long as the catalyst remains properly fluidized, the differential pressure can be kept within a relatively narrow range
If the pressure in the settler is high, increasing the speed of the turbine will raise the suction force, right? What’s the temperature of the oil and gas after cooling?
Can the regeneration pressure be increased?
The regenerator pressure also needs to take into account the surge problem of the main fan
This is necessary; it’s essential! The regeneration pressure should be increased when there is still headroom for it!
Keep the cold water temperature under control; if the temperature of the circulating water is too high, it will cause problems for the entire unit. If it’s impossible to control it, reduce the flow rate to make adjustments.
Initially, the pressure in our settler was 180 Kpa, while the pressure in the regenerator was 205 Kpa. Later, due to poor quality of the raw material, the pressure difference between the two units was controlled at 40 Kpa for a month. Once the quality of the raw material improved, the pressure difference was kept at 10 Kpa for over two months. The inventory level in the stripping section could be maintained at a slightly higher level, and high standards are required for emergency operations in the reaction unit. Of course, when the raw materials are stable, everyone wants to control things according to the design requirements.