초록 ▼

In a process for processing particulate material with a stream of fluid in an annular processing zone, which includes the steps of supplying the particulate material for processing in the zone, discharging processed material from the zone and generating in the zone a circumferentially directed flow

In a process for processing particulate material with a stream of fluid in an annular processing zone, which includes the steps of supplying the particulate material for processing in the zone, discharging processed material from the zone and generating in the zone a circumferentially directed flow of fluid to develop a circulating turbulent band of particles, an improvement to the processing zone which provides a predictable particle flow path both circumferentially and helically of the zone. The improvement comprises directing the flow of fluid to develop a circulating bed with inner bed depth and outer bed depth, a flow of fluid directed at an angle relative to the processing zone base and controlling fluid velocity so that it is greater than the terminal velocity of larger particles point of impact on the bed base and less than the terminal velocity of smaller particles in the superficial space above the bed upper surface.

대표청구항 ▼

[ What is claimed is:] [1.] In a process for contacting particulate material with a fluid in an annular processing zone, said process comprising:supplying said particulate material for processing in said zone;discharging processed particulate material from said processing zone;generating in said zon

[ What is claimed is:] [1.] In a process for contacting particulate material with a fluid in an annular processing zone, said process comprising:supplying said particulate material for processing in said zone;discharging processed particulate material from said processing zone;generating in said zone a circumferentially directed flow of gas to develop a circumferentially circulating turbulent bed material within said processing zone;an improved processing zone in which particulate material is circulated in a controlled manner to provide a predictable particle flow path both circumferentially of said processing zone and helically of said zone, said improvement comprising:i) directing said flow of fluid to develop said circulating bed with a width between about 2 to 20% of bed outer extremity diameter, an inner bed depth of less than 1% of said bed diameter, and an outer bed depth between about 2 to 5% of said bed diameter;ii) said flow of fluid being directed at an angle relative to processing zone base in the range of about 10.degree. to 45.degree.; andiii) controlling the fluid velocity so that it is greater than the terminal velocity of larger particles at point of impact on the base of the bed and less than the terminal velocity of smaller particles in the superficial space directly above the bed upper surface.