US3843314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suspension preheater for firing system
Assignee: Sumitomo Shipbuilding and Machinery Co Ltd
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Filing: 1973-04-03
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Granted: 1974-10-22
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Expires: 1993-04-03
Abstract
Abstract A suspension preheater for use with a firing system which comprises a heat exchange shaft having a gas inlet port mounted on its inner peripheral wall for tangentially blowing hot working gases thereinto and combustion means mounted in its lower portion for generating a bright flame along its longitudinal axis. The bright flame thus generated is confined within the swirling hot gases and affords ample heat to the particulate material therein, which are falling in the form of a cylindrical layer outside of the swirling hot gases by way of radiant heat without directly firing the particulate material. The heat exchange efficiency to the raw materials is highly improved to provide a high level of real calcination even at short retention times.
Inventors
- 👤 Y Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:21
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/434; F; F27; F27B; F27B7/00; F27B7/20; F27B7/2016
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
229 words
A suspension preheater comprising: 1. a heat exchange shaft adapted to be substantially vertically disposed during use; 2. combustion means mounted in the lower portion of said heat exchange shaft for generating a bright flame along the vertical axis thereof; 3. means for introducing hot working gas into said heat exchange shaft so as to flow tangentially around its vertical axis in a helical flow leaving a relatively quiescent axial core in which said bright flame is generated, said means being located in the lower portion of said heat exchange shaft; 4. means for introducing particulate raw material into said heat excange shaft adjacent to its inner wall and remote from the relatively quiescent axial core, said means being located in the upper portion of said heat exchange shaft, whereby: said particulate raw material will be displaced towards the inner wall of said heat exchange shaft by the centrifugal force of the helical flow of said hot working gases and the heavier particles will fall down in the form of a thin layer adjacent to the inner wall of said heat exchange shaft, separated from said bright flame by said hot working gases, while the lighter particles will be carried upward for further concentration and said particular raw material will be subjected to radiant heat generated by said bright flame but will be melted by direct contact with it.
Claim 2
Dependent Claim
229 words
A suspension preheater comprising: 1. a heat exchange shaft adapted to be substantially vertically disposed during use; 2. combustion means mounted in the lower portion of said heat exchange shaft for generating a bright flame along the vertical axis thereof; 3. means for introducing hot working gas into said heat exchange shaft so as to flow tangentially around its vertical axis in a helical flow leaving a relatively quiescent axial core in which said bright flame is generated, said means being located in the lower portion of said heat exchange shaft; 4. means for introducing particulate raw material into said heat excange shaft adjacent to its inner wall and remote from the relatively quiescent axial core, said means being located in the upper portion of said heat exchange shaft, whereby: said particulate raw material will be displaced towards the inner wall of said heat exchange shaft by the centrifugal force of the helical flow of said hot working gases and the heavier particles will fall down in the form of a thin layer adjacent to the inner wall of said heat exchange shaft, separated from said bright flame by said hot working gases, while the lighter particles will be carried upward for further concentration and said particular raw material will be subjected to radiant heat generated by said bright flame but will be melted by direct contact with it.
Claim 3
Dependent Claim
22 words
combustion means mounted in the lower portion of said heat exchange shaft for generating a bright flame along the vertical axis thereof;
Claim 4
Dependent Claim
22 words
combustion means mounted in the lower portion of said heat exchange shaft for generating a bright flame along the vertical axis thereof;
Claim 5
Dependent Claim
50 words
means for introducing hot working gas into said heat exchange shaft so as to flow tangentially around its vertical axis in a helical flow leaving a relatively quiescent axial core in which said bright flame is generated, said means being located in the lower portion of said heat exchange shaft;
Claim 6
Dependent Claim
50 words
means for introducing hot working gas into said heat exchange shaft so as to flow tangentially around its vertical axis in a helical flow leaving a relatively quiescent axial core in which said bright flame is generated, said means being located in the lower portion of said heat exchange shaft;
Claim 7
Dependent Claim
137 words
means for introducing particulate raw material into said heat excange shaft adjacent to its inner wall and remote from the relatively quiescent axial core, said means being located in the upper portion of said heat exchange shaft, whereby: said particulate raw material will be displaced towards the inner wall of said heat exchange shaft by the centrifugal force of the helical flow of said hot working gases and the heavier particles will fall down in the form of a thin layer adjacent to the inner wall of said heat exchange shaft, separated from said bright flame by said hot working gases, while the lighter particles will be carried upward for further concentration and said particular raw material will be subjected to radiant heat generated by said bright flame but will be melted by direct contact with it.
Claim 8
Dependent Claim
137 words
means for introducing particulate raw material into said heat excange shaft adjacent to its inner wall and remote from the relatively quiescent axial core, said means being located in the upper portion of said heat exchange shaft, whereby: said particulate raw material will be displaced towards the inner wall of said heat exchange shaft by the centrifugal force of the helical flow of said hot working gases and the heavier particles will fall down in the form of a thin layer adjacent to the inner wall of said heat exchange shaft, separated from said bright flame by said hot working gases, while the lighter particles will be carried upward for further concentration and said particular raw material will be subjected to radiant heat generated by said bright flame but will be melted by direct contact with it.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |