Patent US4128394A successfully refreshed from Google Patents.
US4128394A
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US
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Tunnel kiln for use in rebaking carbonaceous moldings impregnated with tar, pitch or the like
Assignee: Shinagawa Refractories Co Ltd
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Filing: 1977-03-02
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Granted: 1978-12-05
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Expires: 1997-03-02
Abstract
Abstract A tunnel kiln for use in rebaking carbonaceous moldings impregnated with tar, pitch or the like, consisting of a preheating zone, a baking zone and a cooling zone, which comprises providing arch shafts in the kiln ceiling, providing a plurality of gas recirculating devices communicating with said arch shafts and heating gas blow-in holes of the lower portion of side wall in the preheating zone and the baking zone, and further providing, above the heating gas passages or combustion chambers mounted on a number of connected kiln cars, muffles consisting of receiving plate, bottom plate, holder, cover having in its upper surface a number of tar gas discharge openings, and seal, which muffles accommodating said moldings to be rebaked.
Inventors
- 👤 Kiyoshi Naito
- 👤 Akio Sukuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:00
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/14; F27B9/20; F27B9/26; F27B9/262; C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C04B35/532; F27B9/06; F27B9/08; F27B9/082; F27B9/088; F27B9/30; F27B9/3005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
189 words
A tunnel kiln for use in rebaking carbonaceous moldings impregnated with tar, pitch or the like, said tunnel kiln including a preheating zone, a baking zone and a cooling zone; arch shafts provided in the kiln ceiling, heating gas blow-in holes at the lower portion of the kiln side wall, a plurality of gas recirculating devices for feeding gas from the arch shafts in said preheating zone and baking zone to said blow-in holes, a plurality of connected cars movably mounted in said kiln, each car including passage means serving both as heating gas passages and combustion chambers; a muffle mounted on each car for accommodating said moldings to be rebaked, said muffle being disposed above said passage means, said muffle comprising a bottom plate, a tar-receiving plate mounted in said bottom plate, a holder mounted in said tar-receiving plate for supporting the moldings to be rebaked, a cover supported on said bottom plate to thereby enclose said moldings, holder and tar-receiving plate, a seal disposed between said cover and said bottom plate, and a plurality of tar gas discharge openings provided in the upper surface of said cover.
Claim 2
Dependent Claim
189 words
A tunnel kiln for use in rebaking carbonaceous moldings impregnated with tar, pitch or the like, said tunnel kiln including a preheating zone, a baking zone and a cooling zone; arch shafts provided in the kiln ceiling, heating gas blow-in holes at the lower portion of the kiln side wall, a plurality of gas recirculating devices for feeding gas from the arch shafts in said preheating zone and baking zone to said blow-in holes, a plurality of connected cars movably mounted in said kiln, each car including passage means serving both as heating gas passages and combustion chambers; a muffle mounted on each car for accommodating said moldings to be rebaked, said muffle being disposed above said passage means, said muffle comprising a bottom plate, a tar-receiving plate mounted in said bottom plate, a holder mounted in said tar-receiving plate for supporting the moldings to be rebaked, a cover supported on said bottom plate to thereby enclose said moldings, holder and tar-receiving plate, a seal disposed between said cover and said bottom plate, and a plurality of tar gas discharge openings provided in the upper surface of said cover.
Claim 3
Dependent Claim
45 words
A tunnel kiln for use in rebaking carbonaceous moldings impregnated with tar, pitch or the like according to claim 1 wherein said gas recirculating devices include a tar gas burning furnace, an auxiliary burner for tar burning-out, a recirculating fan and suction and discharge ducts.
Claim 4
Dependent Claim
74 words
A tunnel kiln for use in rebaking carbonaceous moldings impregnated with tar, pitch or the like according to claim 1 wherein a baffle is provided at the lower portion within the arch shaft in the cooling zone, and there are provided a cooling gas ejection nozzle, and a mixing pipe extending downwardly from said ceiling portion into a space between both the side surfaces of said muffle and the side wall of the kiln.
Claim 5
Dependent Claim
65 words
A tunnel kiln for use in rebaking carbonaceous moldings impregnated with tar, pitch or the like according to claim 1 wherein all the heating gas passages in the kiln cars are constructed at regular intervals, and said heating gas blow-in holes or burner holes at the lower portion of the kiln side wall are arranged at the same intervals corresponding to said heating gas passages.
Claim 6
Dependent Claim
53 words
A tunnel kiln for use in rebaking carbonaceous moldings impregnated with tar, pitch or the like according to claim 1 wherein a hot gas exhaust pipe in the cooling zone and a preheating furnace of the carbonaceous moldings are communication with each other through exhaust ducts, suction ducts, discharge fans and discharge ducts.
References Cited (Backward Citations)
US2983022A
Cited
US4050880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |