Why does the temperature of the regeneration bed drop after the catalytic reaction regeneration slide valve is opened wider?
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The setup is coaxial, with a pre-cooler (an external heat exchanger) added in front of the regeneration slide valve. When the regeneration slide valve is opened wider, the ratio of catalyst to oil increases, the amount of coke formed increases, and therefore the temperature of the regeneration bed should rise. Why does the temperature of the regeneration bed drop every time the slide valve is opened wider? I would appreciate guidance from all the experts?????
As the catalyst circulation rate increases, the relative coking time decreases, so the regeneration temperature drops!
As the regenerative slide valve is opened wider, the catalyst circulation rate increases, and the heat carried away from the catalyst by the regenerator rises; as a result, the bed temperature of the regenerator decreases.
In addition to the reasons mentioned on the 2nd floor, the regenerative circuit cold circulation technology you use means that the additional heat exchangers will result in an increase in heat absorption due to the increased amount of catalyst circulation
Additional note for Floor 3: An increase in the oil-to-agent ratio of the large slide valve leads to more coking, an increased oxygen demand for burning, and a rise in bed temperature as a result of increased main air flow
The most fundamental reason is that the temperature at the outlet of the lift pipe decreases, which means the reaction depth is reduced; as a result, the degree of reaction diminishes and the amount of coke formed is lowered. Consequently, the liquid level at the bottom of the distillation tower begins to rise, assuming that all other operating conditions remain unchanged, apart from any changes in the valve opening. Do you understand now that way?
By using the riser for thermal balance, assuming that the temperature at the riser outlet remains constant and the amount of catalyst increases, then the regeneration temperature decreases, which may make it easier to understand.
The poster said that a high catalyst circulation rate leads to more coking, and thus the pre-cooling yield will decrease. In my personal opinion, the conversion rate won’t change much. The ratio of extractant to oil definitely needs to be reduced, as this ratio only increases the number of active centers. Is the decrease in bed temperature mentioned by the original poster temporary, occurring only at the moment when the slide valve is first opened?