What is the appropriate amount of catalyst cracking pre-raise medium to use? How to tell?
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What is the appropriate amount of catalyst cracking pre-raise medium to use? How can we tell? What are the harms of having too much or too little?
The flow rate of the pre-lift medium is calculated based on the diameter of the pre-lift section and the linear speed required in that section; too low a flow rate results in poor pre-lift effects, and even catalyst accumulation at the bottom of the lift pipe, while too high a flow rate increases the load on the subsequent systems
The amount of pre-lift medium is determined based on the spool valve pressure drop and the speed of the lift pipeline
If you don’t know how to calculate it, you can refer to the density of the pre-lift stage; a high density indicates insufficient pre-lift, while a low density suggests excessive pre-lift. It’s sufficient to keep the density within an appropriate range. Of course, the valve pressure drop and the pipeline lift speed also need to be taken into consideration!
What is the appropriate density? 300-460
The amount is determined by the line speed, 3.5-4.5 m/s.
Temperature, pressure (pressure drop), and density can be taken into consideration. The density in the pre-lift section is generally sufficient to be between 300 and 400!