Patent US4002422A successfully refreshed from Google Patents.
US4002422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packed bed heat exchanger
Assignee: ZURICH BRANCH OF MIDREX INTERNATIONAL BV A NETHERLANDS Corp
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Filing: 1975-09-22
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Granted: 1977-01-11
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Expires: 1995-09-22
Abstract
Abstract Apparatus for treating particulate material with hot gases wherein preheated gases are introduced to the particulate material to heat and treat such material and a second cooler gas is introduced to the heated material to impart some cooling to the material and to heat the second gas to treatment temperature followed by movement of the heated second gas through the bed of material in which it acts in the same manner as the hot treating gas.
Inventors
- 👤 Robert Milton Escott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:38
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/02; C21B13/029; C21B2100/00; C21B2100/20; C21B2100/22; C21B2100/60; C21B2100/64; C21B2100/66
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
Apparatus for treating particulate material with hot gases comprising: a. a substantially vertical shaft furnace; b. means for introducing particulate material at one end of said shaft furnace to form a packed bed therein; c. means for removing treated particulate material at the other end of said furnace, thereby setting up a gravitational flow of material therein; d. means intermediate said material introduction means and said material removal means for introducing hot process gas to said bed of material; e. means intermediate said hot gas introduction means and said material removal means for introducing cold process gas to said packed bed, and for moving said cold process gas inwardly through said packed bed, whereby a portion of the heat of said descending bed is transferred to said cold process gas, heating and upgrading said gas which then flows upwardly through the bed contributing to the process in the same manner as the hot process gas.
Claim 2
Dependent Claim
155 words
Apparatus for treating particulate material with hot gases comprising: a. a substantially vertical shaft furnace; b. means for introducing particulate material at one end of said shaft furnace to form a packed bed therein; c. means for removing treated particulate material at the other end of said furnace, thereby setting up a gravitational flow of material therein; d. means intermediate said material introduction means and said material removal means for introducing hot process gas to said bed of material; e. means intermediate said hot gas introduction means and said material removal means for introducing cold process gas to said packed bed, and for moving said cold process gas inwardly through said packed bed, whereby a portion of the heat of said descending bed is transferred to said cold process gas, heating and upgrading said gas which then flows upwardly through the bed contributing to the process in the same manner as the hot process gas.
Claim 3
Dependent Claim
48 words
Apparatus according to claim 1 wherein said means for introducing said cold process gas comprises a bustle surrounding said furnace, a multiplicity of gas inlet pipes communicating with said bustle and the interior of said furnace, and a source of said cold process gas communicating with said bustle.
Claim 4
Dependent Claim
16 words
Apparatus according to claim 2 wherein said gas inlet pipes are inclined downwardly from said bustle.
Claim 5
Dependent Claim
33 words
Apparatus according to claim 1 further comprising a cooling zone beneath said means for introducing cold process gas to said packed bed and means for cooling said treated product in said cooling zone.
Claim 6
Dependent Claim
35 words
Apparatus according to claim 1 wherein said means for introducing said cold process gas comprises a source of cold process gas and a gas inlet communicating with said source and the interior of said furnace.
Claim 7
Dependent Claim
12 words
Apparatus according to claim 5 wherein said gas inlet is a slot.
Claim 8
Dependent Claim
10 words
Apparatus according to claim 6 wherein said slot is rectangular.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |