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US3922797A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for cooling hot particulate material

Assignee: Fuller Co
•
Filing: 1974-07-18
•
Granted: 1975-12-02
•
Expires: 1994-07-18
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Abstract

Abstract A method and apparatus for cooling hot particulate material such as cement clinker discharged from a furnace, such as a rotary kiln. A first heat exchanger of the type wherein cooling gas is passed upwardly through the material to cool the material and this gas is heated by the hot material and supplied to the kiln as preheated combustion air. The first heat exchanger is followed by a clinker breaker and a second heat exchanger which includes an arrangement for spraying the hot material with water. The spray cooler is followed by a third heat exchanger of the type wherein cooling air is passed upwardly through the material in direct contact with the material. The cooling air which flows through the third heat exchanger flows directly through the first heat exchanger. A material seal is provided between the second and third heat exchangers to prevent cooling air from passing through the second heat exchanger. A vent from the second heat exchanger is provided to exhaust steam produced when the water contacts the hot material. A control may be provided so that the amount of water sprayed onto the hot material at the second heat exchanger is responsive to the temperature of the material discharged from the third heat exchanger. As a modification, ambient air may be supplied directly to the hottest material discharged from the kiln for passage through the first heat exchanger.

Inventors

  • 👤 Charles J Dick

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 20:35
CPC Classifications
F; F27; F27D; F27D15/00; F27D15/02; F27D15/0206; F27D15/0213; F27D17/00; F27D17/10; F27D17/17; F27D3/00; F27D2003/0034; F27D2003/0071; F27D9/00; F27D2009/007; F27D2009/0081; F27D2009/0083; F27D2009/0086; F27D2015/024; F27D2015/0246; F27D2015/0253

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 120 words
The method of cooling hot particulate material such as cement clinker discharged from a furnace such as a rotary kiln and supplying preheated gas to the furnace comprising the steps of: passing a cooling gas through the material discharged from said furnace to cool the material and heat the gas; then, further cooling the material by directly contacting said material with a liquid; subsequently, passing a cooling gas through the material to further cool the material and heat the gas; returning substantially all of the heated gas which has passed through the material to the furnace as preheated gas; and exhausting vapor formEd by directly contacting the material with a liquid separately from the heated gas returned to the furnace.
Claim 2
Independent Claim 120 words
The method of cooling hot particulate material such as cement clinker discharged from a furnace such as a rotary kiln and supplying preheated gas to the furnace comprising the steps of: passing a cooling gas through the material discharged from said furnace to cool the material and heat the gas; then, further cooling the material by directly contacting said material with a liquid; subsequently, passing a cooling gas through the material to further cool the material and heat the gas; returning substantially all of the heated gas which has passed through the material to the furnace as preheated gas; and exhausting vapor formEd by directly contacting the material with a liquid separately from the heated gas returned to the furnace.
Claim 3
Dependent Claim 29 words
The method according to claim 1 further comprising the step of substantially preventing cooling gas from passing through said material while it is being directly contacted by a liquid.
Claim 4
Dependent Claim 49 words
The method according to claim 1 further comprising the step of sequentially passing cooling gas first through the material after the material is cooled by direct contact with liquid and then passing the same cooling gas through the material before the material is cooled by direct contact with liquid.
Claim 5
Independent Claim 51 words
The method of cooling hot particulate material comprising the steps of: passing a cooling gas through the material to be cooled; further cooling said material by directly contacting said material with a liquid while substantially preventing the passage of a cooling gas therethrough; and passing a cooling gas through said material.
Claim 6
Independent Claim 51 words
The method of cooling hot particulate material comprising the steps of: passing a cooling gas through the material to be cooled; further cooling said material by directly contacting said material with a liquid while substantially preventing the passage of a cooling gas therethrough; and passing a cooling gas through said material.
Claim 7
Dependent Claim 54 words
The method of cooling hot particulate material according to claim 4 further comprising the step of sequentially passing cooling gas first through the material after the material is cooled by direct contact with liquid and then passing the same cooling gas through the material before the material is cooled by direct contact with liquid.
Claim 8
Dependent Claim 31 words
The method of cooling hot particulate material according to claim 5 further comprising the step of passing ambient cooling gas through the material before it is directly contacted by a liquid.

References Cited (Backward Citations)

US1844782A Cited
US1979602A Cited
US2367063A Cited
US3686773A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-12-01 1979-06-02 1979-12-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-12-01 1983-06-02 1983-12-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-12-01 1987-06-02 1987-12-02 $7700.00 Window Closed / Lapsed

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