Patent US3765102A successfully refreshed from Google Patents.
US3765102A
Expired / Lapsed
US
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Rotary apparatus for treating particulate material
Assignee: HARSCH Corp (HARSCO)
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Filing: 1972-09-21
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Granted: 1973-10-16
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Expires: 1992-09-21
Abstract
Abstract Apparatus for treating particulate material comprises a multiplicity of tubes mounted within a rotating shell. The material and a treating gas flow together through the tubes, while a heating or cooling fluid is conducted through a closed chamber surrounding the tubes for heat exchange with the tube walls, and thus with the material. The material is aerated as it flows through the tubes by gentle mechanical tumbling agitation. A flow-control dam near the outlet end of each tube provides a controlled fill of each tube and ensures a controlled retention time for the material.
Inventors
- 👤 J Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:40
CPC Classifications
F; F26; F26B; F26B11/00; F26B11/02; F26B11/04; F26B11/0404; F26B11/0418; F26B11/0422
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
240 words
Apparatus for treating (e.g., drying, heating, cooling or reacting) particulate material comprising a cylindrical shell mounted for rotation about its axis, means for rotating the shell, fixed end covers closing the ends of the shell, first and second transverse tube sheets fixed within the shell at spacedapart locations, the first tube sheet and one end cover defining an inlet zone in the shell, the second tube sheet and the other end cover defining an outlet zone in the shell, and the two tube sheets defining a closed chamber between them, means for introducing the particulate material to be treated into the inlet zone at a controlled rate, a multiplicity of tubes mounted in the tube sheets in spaced-apart relation, the tubes communicating the inlet zone with the outlet zone for flow of the material and a gas therethrough, a material flow-control dam element mounted in each tube adjacent the downstream end thereof and providing a controlled fill of material in each tube, each dam element being a member extending circumferentially of and inwardly from the tube wall a uniform distance, means in each tube for agitating the material flowing therethrough, means for conducting a flow of gas through the tubes, means for conducting a flow of a heating or cooling fluid through the closed chamber outside the tubes for heat exchange with the tube walls, and means for removing the material and gas from the outlet zone of the apparatus.
Claim 2
Dependent Claim
240 words
Apparatus for treating (e.g., drying, heating, cooling or reacting) particulate material comprising a cylindrical shell mounted for rotation about its axis, means for rotating the shell, fixed end covers closing the ends of the shell, first and second transverse tube sheets fixed within the shell at spacedapart locations, the first tube sheet and one end cover defining an inlet zone in the shell, the second tube sheet and the other end cover defining an outlet zone in the shell, and the two tube sheets defining a closed chamber between them, means for introducing the particulate material to be treated into the inlet zone at a controlled rate, a multiplicity of tubes mounted in the tube sheets in spaced-apart relation, the tubes communicating the inlet zone with the outlet zone for flow of the material and a gas therethrough, a material flow-control dam element mounted in each tube adjacent the downstream end thereof and providing a controlled fill of material in each tube, each dam element being a member extending circumferentially of and inwardly from the tube wall a uniform distance, means in each tube for agitating the material flowing therethrough, means for conducting a flow of gas through the tubes, means for conducting a flow of a heating or cooling fluid through the closed chamber outside the tubes for heat exchange with the tube walls, and means for removing the material and gas from the outlet zone of the apparatus.
Claim 3
Dependent Claim
22 words
Apparatus according to claim 1 and further comprising means in the inlet section of the apparatus for agitating the material received therein.
Claim 4
Dependent Claim
23 words
Apparatus according to claim 2 wherein the agitating means in the tubes and the agitating means in the inlet section include common elements.
Claim 5
Dependent Claim
31 words
Apparatus according to claim 1 wherein the means for agitating the material in each tube includes a core pipe element extending axially through at least an upstream portion of each tube.
Claim 6
Dependent Claim
33 words
Apparatus according to claim 4 wherein each core pipe projects from the upstream end of the respective tube a substantial distance into the inlet zone thereby to agitate material in the inlet zone.
Claim 7
Dependent Claim
47 words
Apparatus according to claim 4 wherein the core pipe element has openings in the wall thereof for flow of gases and the material being treated between the interior of the core pipe element and the annular space within the tube and outside of the core pipe element.
Claim 8
Dependent Claim
31 words
Apparatus according to claim 1 wherein the agitating means includes a multiplicity of vanes in each tube extending generally lengthwise thereof and spaced from each other and from the tube axis.
Claim 9
Dependent Claim
16 words
Apparatus according to claim 7 wherein the vanes are spaced from the wall of the tube.
Claim 10
Dependent Claim
33 words
Apparatus according to claim 7 wherein each vane includes in cross-section first and second spaced-apart portions defining an obtuse angle between them thereby to define a cavity for reception and lifting of material.
Claim 11
Dependent Claim
13 words
Apparatus according to claim 9 wherein the vanes are generally L-shaped in cross-section.
Claim 12
Dependent Claim
26 words
Apparatus according to claim 10 wherein the vanes extend upstream from the tubes into the inlet section thereby to agitate material received in the inlet section.
Claim 13
Dependent Claim
50 words
Apparatus according to claim 1 wherein a downstream end portion of each tube adjacent the flow-control dam element thereof is free of agitating means thereby to restrict aeration in such end portion, permit an accumulation of material behind the dam element, and limit entrainment of material in the gas flow.
Claim 14
Dependent Claim
46 words
Apparatus according to claim 1 wherein the aqitating means includes an axially extending centrally located hollow core pipe element and at least one vane mounted on the exterior of the core pipe element and extending generally radially outwardly from and longitudinally of the core pipe element.
Claim 15
Dependent Claim
48 words
Apparatus according to claim 13 wherein the core pipe element has spaced-apart openings in the wall thereof for flow of gases and the material being treated between the interior of the core pipe element and the annular space within the tube and outside of the core pipe element.
Claim 16
Dependent Claim
84 words
Apparatus according to claim 14 wherein there is at least one pair of vanes, the vanes of said pair being located at diametrically opposite positionS on the core pipe element and wherein the core pipe element openings are located downstream, relative to the direction of rotation of the tube, from each vane, the openings associated with each vane being staggered lengthwise of the core pipe element such that material picked up by the vanes enters and leaves the core pipe element through the openings.
Claim 17
Dependent Claim
29 words
Apparatus according to claim 1 wherein the agitating means is removably received within each tube so that it is readily removed for cleaning and for cleaning of the tubes.
Claim 18
Dependent Claim
29 words
Apparatus according to claim 1 wherein each flow-control dam element is a substantially flat annular plate mounted with its major surfaces substantially perpendicular to the axis of the tube.
Claim 19
Dependent Claim
25 words
Apparatus according to claim 1 wherein each flow-control element is a strip of material of uniform width disposed helically adjacent the end of the tubes.
Claim 20
Dependent Claim
55 words
Apparatus according to claim 1 wherein the flow-control dam element includes a multiplicity of longitudinally spaced-apart overlapping annular segments, each of which has its ends spaced from an adjacent element and all of which in aggregation define an annular obstruction to longitudinal material flow of essentially uniform height measured radially inwardly from the tube wall.
Claim 21
Dependent Claim
29 words
Apparatus according to claim 1 wherein the dam element is removably received in each tube so that it is readily removed for cleaning and for cleaning of the tubes.
Claim 22
Dependent Claim
97 words
Apparatus according to claim 1 wherein the means for conducting a flow of fluid through the closed chamber includes baffle plates disposed transversely across the chamber, a first baffle plate being positioned adjacent the first tube sheet and defining therewith a fluid supply zone and a second baffle plate being positioned adjacent the second tube sheet and defining therewith a fluid discharge zone, a fluid supply conduit communicating with the supply zone for supply of fluid to the chamber, and a fluid discharge conduit communicating with the fluid discharge zone for removal of fluid from the chamber.
Claim 23
Dependent Claim
27 words
Apparatus according to claim 21 wherein each baffle plate includes an annular fluid flow-control orifice around each tube for inducing an annular flow stream along each tube.
Claim 24
Dependent Claim
24 words
Apparatus according to claim 1 wherein the shell and end covers are mounted for adjustment of the inclination of the axis of the shell.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |