Method of and a device for controlling the process temperature in an air stream drying system

Claim 2

In a drying process hwerein particles are suspended and conveyed in a high velocity and high temperature gas stream and thereupon, after drying, are separated from the gas stream, the improvement of controlling the temperature of the gas stream comprising, introducing, by suction, after the drying and before the separation of the particles, a controlled amount of an ambient gas into said gas stream at opposite sides of said gas stream in staggered relationship both as to the vertical and horizontal directions of said gas stream, thereby restraining stratification of the entering gas.

Claim 3

In a process according to claim 1, the step of adjusting the inlet temperature of said gas stream in response to specific temperature requirements of the particles.

Claim 4

In a process according to claim 2, further comprising the step of adjusting the amount of said ambient gas fed into said stream, in response to a desired outlet temperature of said particles.

Claim 5

In an air drying system for particles suspended and conveyed in a high velocity and high temperature air stream passing through a channel, including a drying portion, an intermediate portion and an end portion thereafter, process temperature control means comprising two adjustable ambient air inlet openings located on opposite sides in the intermediate portion of said drying channel and being staggered from each other in both the horizontal direction and the vertical direction, means operable for introducing a controlled amount of ambient air through said inlet openings, thereby controlling the process and outlet temperatures of said particles.

Claim 6

In an air drying system for particles suspended and conveyed in a high velocity and high temperature air stream passing through a channel, including a drying portion, an intermediate portion and an end portion thereafter, process temperature control means comprising two adjustable ambient air inlet openings located on opposite sides in the intermediate portion of said drying channel and being staggered from each other in both the horizontal direction and the vertical direction, means operable for introducing a controlled amount of ambient air through said inlet openings, thereby controlling the process and outlet temperatures of said particles.

Claim 7

In an air drying system according to claim 4 wherein each of said ambient air inlet openings includes adjustable louvers.

Claim 8

In an air drying system according to claim 4, further comprising inlet temperature control means including an adjustable heat source disposed at the intake section of said drying channel portion, inlet temperature sensing means disposed in said drying channel portion and outlet temperature sensing means disposed in said end channel portion, heat source control member operatively associated with said inlet and outlet temperature sensing means and being operable for adjusting said heat source and thereby the inlet temperature of said air stream according to specific temperature requirements of processed particles.

Claim 9

In an air drying system for particles suspended and conveyed in a high velocity and high temperature air stream passing through a channel, including a drying portion, an intermediate portion and an end portion thereafter, process temperature control means comprising at least one ambient air inlet opening located in the intermediate portion of said drying channel, means operable for introducing a controlled amount of ambient air through said inlet opening thereby controlling the process and outlet temperatures of said particles, said process temperature control means further including a cool air blower, ambient air duct connected between said air blower and said ambient air inlet opening, and a controllable damping member disposed in said ambient air duct, and further comprising inlet temperature control means including an adjustable heat source disposed at the intake section of said drying channel portion, inlet temperature sensing means disposed in said drying channel portion and outlet temperature sensing means disposed in said end channel portion, heat source control member operatively associated with said inlet and outlet temperature sensing means and being operable for adjusting said heat source and thereby the inlet temperature of said air stream according to specific temperature requirements of processed particles.

Claim 10

In an air drying system for particles suspended and conveyed in a high velocity and high temperature air stream passing through a channel, including a drying portion, an intermediate portion and an end portion thereafter, process temperature control means comprising at least one ambient air inlet opening located in the intermediate portion of said drying channel, means operable for introducing a controlled amount of ambient air through said inlet opening thereby controlling the process and outlet temperatures of said particles, said process temperature control means further including a cool air blower, ambient air duct connected between said air blower and said ambient air inlet opening, and a controllable damping member disposed in said ambient air duct, and further comprising inlet temperature control means including an adjustable heat source disposed at the intake section of said drying channel portion, inlet temperature sensing means disposed in said drying channel portion and outlet temperature sensing means disposed in said end channel portion, heat source control member operatively associated with said inlet and outlet temperature sensing means and being operable for adjusting said heat source and thereby the inlet temperature of said air stream according to specific temperature requirements of processed particles.