EFFECT OF NOZZLE ARRANGEMENT ON GAS-SOLID FLOW CHARACTERISTICS AND HEAT AND MASS TRANSFER INSIDE THE RISER

Abstract

Abstract: Good interphase heat and mass transfer and gas-solid flow characteristics in the catalytic cracking riser can provide a favorable reaction environment for the catalytic cracking unit. The effects of 4 different nozzle arrangements on gas-solid flow characteristics and heat and mass transfer in the riser of a 1.80 Mt/a FCC unit were studied by numerical simulation. The simulation results showed that the distribution of solid holdup of catalyst and oil-gas in the riser of arrangement B with 8 nozzles and 30° nozzle inclination was better than other arrangements;the heat transfer between phases in the riser was very rapid, the temperature distribution of gas-liquid-solid three-phase was almost the same under 4 nozzle arrangements, and the distribution of feedstock oil droplets was relatively uniform in arrangement B. Through the evaluation of feedstock oil droplet evaporation, it is found that arrangement B has the best evaporation effect, which is beneficial to the FCC reaction and the improvement of product distribution.

Key words: catalytic cracking, riser, nozzle, gas-solid flow characteristics, heat and mass transfer

References

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