EFFECT OF NOZZLE ARRANGEMENT ON GAS-SOLID FLOW CHARACTERISTICS AND HEAT AND MASS TRANSFER INSIDE THE RISER
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.
catalytic crackingrisernozzlegas-solid flow characteristicsheat and mass transfer
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