| 摘要 |
A method and apparatus are described for contacting solid particles and fluid. A liquid is sprayed as liquid droplets from the discharge tip of a nozzle (50) into hot solid particles passing upwardly; in a vertical pipe (23). A venturi is formed in the pipe, and the venturi has an enhance portion which is up- wardly convergent to the throat and an exit portion which is up- wardly divergent from the throat. The tip of the nozzle (50) is so located relative to the venturi that liquid droplets commence va- porization, due to heat transfer from the hot solid particles, no further upstream (relative to the direction of movement of solid particles up the pipe (23)) then the throat of the venturi thereby resulting in a high degree of turbulence which causes good mix- ing of particles and vapour downstream of the venturi throat. The particles-vapour mixture leaving the exit portion of the ven- turf is will mixed and particles are substantially uniformly mixed with vapour in radial planes of the pipe (23) downstream of the venturi. The energy of the droplets entering the pipe (23) from the nozzle (30) is shared with particles upstream of the throat and accelerates them to higher velocities in the pipe (23). The method and apparatus may be employed for mixing-a hy- drocarbon feed with hot active craking catalyst particles in a ca- talytic cracking unit or process to reduce yields of light gas and coke and to increase yields of more valuable hydrocarbon pro- ducts.
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