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What are the characteristics of a catalytic cracking riser? ? ?
During the fluidization process, when the gas velocity is higher than the entrainment velocity, the solid particles are entrained away. The carried particles are moved upward along a vertical pipe, which is called a lift pipe. The riser has two main uses. The first is for the transportation of solid particles ； First, as a reactor, also known as a lift tube reactor, the catalyst and gaseous feed react while staying in the lift tube, and at the outlet the reaction products are separated from the catalyst. After being regenerated, the catalyst returns to the lift tube, forming a circulating fluidized bed reaction system. The main advantages of a riser reactor are low backmixing, high efficiency, and simple structure. Current catalytic cracking units all use riser reactors.