US3834860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for heating and calcining of powder and/or pulverized materials
Assignee: Taiheiyo Cement Corp
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Filing: 1972-09-20
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Granted: 1974-09-10
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Expires: 1992-09-20
Abstract
Abstract An apparatus for preheating or calcining of powder and/or pulverized materials in which a cylindrical combustion furnace comprises a precombustion chamber and a main combustion chamber. Air inlet pipes are connected tangentially to said respective chambers in order that the air for use in combusting blown in said chambers from said air inlet pipes does a circling movement of the air stream. The precombustion chamber is provided with a fuel spraying burner, and material feeding devices are set in combustion air inlet pipes which lead to said main combustion chamber in order to separate powder and/or pulverized materials from the fuel gas in said combustion chamber by means of the centrifugal power and, further, to heat amd calcine said material directly by a high temperatured combustion and so as to obtain a calcining efficiency without incurring a damage to the wall of said furnace by heat.
Inventors
- 👤 Y Fukuda
- 👤 Y Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:34
CPC Classifications
F; F01; F01D; F01D17/00; F01D17/02; F01D17/06; C; C04; C04B; C04B7/00; C04B7/36; C04B7/43; C04B7/434; F27; F27B; F27B7/00; F27B7/20; F27B7/2016; F27B7/2025; F27B7/2033
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
Apparatus for heating and calcining pulverized materials comprising a combustion furnace having a precombustion chamber and a main combustion chamber, both having a round cross section and connected coaxially directly to each other; a burner connected axially to the end of said precombustion chamber opposite the end thereof connected to said main combustion chamber and positioned to direct fuel axially into said precombustion and said main combustion chambers; a first combustion air inlet pipe connected tangentially to said precombustion chamber; a second combustion air inlet pipe connected tangentially to said main combustion chamber; means for supplying pulverized feed material to at least said air inlet pipe connected to said main combustion chamber; and a cyclone preheater connected to said means for supplying pulverized feed material.
Claim 2
Dependent Claim
125 words
Apparatus for heating and calcining pulverized materials comprising a combustion furnace having a precombustion chamber and a main combustion chamber, both having a round cross section and connected coaxially directly to each other; a burner connected axially to the end of said precombustion chamber opposite the end thereof connected to said main combustion chamber and positioned to direct fuel axially into said precombustion and said main combustion chambers; a first combustion air inlet pipe connected tangentially to said precombustion chamber; a second combustion air inlet pipe connected tangentially to said main combustion chamber; means for supplying pulverized feed material to at least said air inlet pipe connected to said main combustion chamber; and a cyclone preheater connected to said means for supplying pulverized feed material.
Claim 3
Dependent Claim
38 words
The calcining apparatus of claim 1 further comprising swirl vanes positioned at the outlets of said first and second air inlet pipes which convey the air for use in combusting towards said precombustion and main combustion chambers, respectively.
Claim 4
Dependent Claim
20 words
The calcining apparatus of claim 1, wherein throttles are provided at the combustion gas outlet of said main combustion chamber.
Claim 5
Dependent Claim
107 words
Apparatus for heating and calcining pulverized materials comprising a combustion furnace including an upper precombustion chamber and a lower main combustion chamber, both having a circular cross section; a plurality of air inlet pipes connected tangentially to said precombustion chamber and main combustion chamber, respectively; a plurality of burners mounted respectively on and in the wall of said precombustion chamber and said main combustion chamber; a cylindrical mixing chamber of larger diametrical dimensions in the central portions as compared with that of upper and lower portions; and an inclined duct for interconnecting the central part of said mixing chamber with an outlet of said main combustion chamber.
Claim 6
Dependent Claim
107 words
Apparatus for heating and calcining pulverized materials comprising a combustion furnace including an upper precombustion chamber and a lower main combustion chamber, both having a circular cross section; a plurality of air inlet pipes connected tangentially to said precombustion chamber and main combustion chamber, respectively; a plurality of burners mounted respectively on and in the wall of said precombustion chamber and said main combustion chamber; a cylindrical mixing chamber of larger diametrical dimensions in the central portions as compared with that of upper and lower portions; and an inclined duct for interconnecting the central part of said mixing chamber with an outlet of said main combustion chamber.
Claim 7
Dependent Claim
15 words
The calcining apparatus of claim 4, wherein said inclined duct has a square cross section.
Claim 8
Dependent Claim
48 words
The calcining apparAtus of claim 5, which further includes a rotary kiln; a first smoke duct for interconnecting said kiln to a lower port of said mixing chamber; a second smoke duct for interconnecting an upper port of said mixing chamber to a network of interconnected cyclone preheaters.
Claim 9
Dependent Claim
100 words
Apparatus for heating and calcining pulverized materials comprising a combustion furnace including an upper precombustion chamber and a lower main combustion chamber, each of said chambers being cylindrically shaped; a plurality of air inlet pipes tangentially connected to said precombustion chamber and main combustion chamber, respectively; a plurality of burners connected to said precombustion chamber and main combustion chamber, respectively; a cylindrical mixing chamber having the diametrical dimensions of its upper portions smaller than those of its lower portions; and an inclined duct for connecting a lower end of said mixing chamber to an outlet of said main combustion chamber.
Claim 10
Dependent Claim
100 words
Apparatus for heating and calcining pulverized materials comprising a combustion furnace including an upper precombustion chamber and a lower main combustion chamber, each of said chambers being cylindrically shaped; a plurality of air inlet pipes tangentially connected to said precombustion chamber and main combustion chamber, respectively; a plurality of burners connected to said precombustion chamber and main combustion chamber, respectively; a cylindrical mixing chamber having the diametrical dimensions of its upper portions smaller than those of its lower portions; and an inclined duct for connecting a lower end of said mixing chamber to an outlet of said main combustion chamber.
Claim 11
Dependent Claim
52 words
The calcining apparatus of claim 7, wherein a lower exhaust port of said mixing chamber is connected by a first smoke duct to a rotary kiln and an upper port of said mixing chamber is connected by a second smoke duct to a suspension preheater comprising a plurality of interconnected cyclone preheaters.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |