Title:
PERFORMANCE-INCREASING, NITROGEN OXIDE-REDUCING CROSS-FIRING OF TANK FURNACES
Document Type and Number:
WIPO Patent Application WO1996041771
Kind Code:
A3
Abstract:
The disclosed cross-flame arrangement of cross-fired tank furnaces aims at a relative reduction of flame and roof temperatures in order to improve furnace performance and reduce nitrogen oxide. By partially deflecting fuel jets sideways out of the combustion air flow with several burners and orifice jewels, the starting reaction of the flame is subdued, a "cold" flame root is set, and NO is reduced. At the same time, a carburating effect is achieved, increasing the emission coefficient of the flame. Next to the furnace walls, therefore, it acts at first as a heat sink, but in the centre of the furnace, the heat emitted by the flame is intensified instead of its temperature (reducing its maximum values and NO emissions). The deflection of the flames into a fan flame pattern also increases flame length and the extent of coverage of the melt surface by the flames, lengthens the path of the flames and shortens the path of thermal radiation to flame-distant areas of the glass bath surface. Flame position may be vertically adjusted to give a uniform distance from the molten glass. The temperature in the upper part of the furnace is relatively reduced, lowering NO emission and increasing melting capacity. The improved heat radiation lowers the temperature at the outer end of the flame. In addition, the temperature reduction next to both furnace walls increases glass transverse flow in the lower part of the furnace, improving its performance.
Inventors:
HEGEWALD FRANK (DE)
HEMMANN PETER (DE)
HEELEMANN HELMUT (DE)
HEMMANN PETER (DE)
HEELEMANN HELMUT (DE)
Application Number:
PCT/EP1996/002466
Publication Date:
January 30, 1997
Filing Date:
June 07, 1996
Export Citation:
Assignee:
SOFTWARE & TECH GLAS GMBH (DE)
HEGEWALD FRANK (DE)
HEMMANN PETER (DE)
HEELEMANN HELMUT (DE)
HEGEWALD FRANK (DE)
HEMMANN PETER (DE)
HEELEMANN HELMUT (DE)
International Classes:
C03B5/235; F23C5/00; F23M5/02; F27B3/20; (IPC1-7): C03B5/235; F23C5/00; F23M5/02; F27B3/20; F27D23/00
Foreign References:
| US4313722A | 1982-02-02 | |||
| US4347072A | 1982-08-31 | |||
| DE4244068C1 | 1994-04-07 |
Other References:
DATABASE WPI Section Ch Week 7324, Derwent World Patents Index; Class L01, AN 73-34249U, XP002017858
V.I.ORZHEVSKII ET AL.: "A High Specific Productivity Tank Furnace", GLASS AND CERAMICS, vol. 35, no. 1/2, January 1978 (1978-01-01) - February 1978 (1978-02-01), NEW YORK US, pages 65 - 68, XP002018206
DATABASE WPI Section Ch Week 8137, Derwent World Patents Index; Class L01, AN 81-67633D, XP002017859
DATABASE WPI Section Ch Week 8621, Derwent World Patents Index; Class L01, AN 86-136459, XP002017860
DATABASE WPI Section Ch Week 8620, Derwent World Patents Index; Class L01, AN 86-130409, XP002017861
DATABASE WPI Section Ch Week 8635, Derwent World Patents Index; Class L01, AN 86-231190, XP002017862
V.I.ORZHEVSKII ET AL.: "A High Specific Productivity Tank Furnace", GLASS AND CERAMICS, vol. 35, no. 1/2, January 1978 (1978-01-01) - February 1978 (1978-02-01), NEW YORK US, pages 65 - 68, XP002018206
DATABASE WPI Section Ch Week 8137, Derwent World Patents Index; Class L01, AN 81-67633D, XP002017859
DATABASE WPI Section Ch Week 8621, Derwent World Patents Index; Class L01, AN 86-136459, XP002017860
DATABASE WPI Section Ch Week 8620, Derwent World Patents Index; Class L01, AN 86-130409, XP002017861
DATABASE WPI Section Ch Week 8635, Derwent World Patents Index; Class L01, AN 86-231190, XP002017862
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