Countercurrent heat transfer device for solid particle streams

Details Countercurrent heat transfer device for solid particle streams Countercurrent heat transfer device for solid particle streams

1985-01-14

1987-01-27

Favors, Edward G.

Heating

Tumbler-type rotary - drum furnace

Having combustion products generated in or fed to drum

110226, 110246, 165 89, 165 90, F27B 708, F27B 710

Patent

active

046392173

ABSTRACT:
A rotary kiln is formed by a helical tube secured inside a cylindrical shell, and fitted with flow spoiler baffles between each turn of the helical tube. Inside the helical tube, one solid particle stream flows uphill in the manner of the classical Archimedes screw. Another stream of particles is tumbled by the flow spoiler baffles and flows under gravity downhill through the center of the helical tube, tumbling over the successive convolutions of the helical tube. This downhill flow occurs because the particles collide with the interflute spoiler baffles, tumble and fall off the helical flutes, thus causing the countercurrent flow. A wide range of surface-to-volume ratios of, and heat transfer through, the helical tube may be achieved by a proper design of the relative width of the tube. This helical tube in a drum device provides heat transfer for a varied number of process applications, such as oil shale or tar sands retorting. Oil vapor is generated in one stream responsive to the heat of combustion or gasification of the spent char in the counterflowing stream. Heat from the combustion and the sensible heat of the ash is transferred through the wall of the helical tube to the inflowing stream with no stream intermixing.

REFERENCES:
patent: 3056588 (1962-10-01), Alexandrovsky
patent: 3481720 (1969-12-01), Bennett
patent: 3787292 (1974-01-01), Keappler
patent: 4361100 (1982-11-01), Hinger
patent: 4441906 (1984-04-01), Propster et al.

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