Heating – Processes of heating or heater operation – Subjecting work to diverse treatments or graduated temperatures
Patent
1978-12-28
1980-09-09
Yuen, Henry C.
Heating
Processes of heating or heater operation
Subjecting work to diverse treatments or graduated temperatures
432 78, 266178, F26B 912
Patent
active
042215595
ABSTRACT:
A charge of pellets is moved on a traveling grate in succession through first and second drying zones, a preheating zone, first and second firing zones, and first and second cooling zones, in that order. The pellets are dried in the first and second drying zones, preheated in the preheating zone, fired in the first and second firing zones, and cooled in the first and second cooling zones. Cooling air is forced through the charge in the first and second cooling zones. A first stream of cooling air is exhausted from the first cooling zone and delivered at least in part to the first and second firing zones. A second stream of used cooling air is exhausted from the second cooling zone and delivered to one of the drying zones. A first exhaust gas stream is withdrawn from the second firing zone and cooled in a waste heat boiler. A second exhaust gas stream is withdrawn from the first firing zone and mixed with the first exhaust gas stream which has been cooled in a waste heat boiler, whereby a mixed exhaust gas stream is formed. This mixed exhaust gas stream is supplied at least in part to the other drying zone. A branch stream is withdrawn from the first stream of used cooling air or mixed exhaust gas stream and is supplied to the preheating zone.
REFERENCES:
patent: 2750274 (1956-06-01), Lellep
patent: 3005699 (1961-10-01), Erck et al.
patent: 3172754 (1965-03-01), Anthes et al.
patent: 3244507 (1966-04-01), Linney
patent: 3787171 (1974-01-01), Cromp
patent: 3871631 (1975-03-01), Biewinga
patent: 4005979 (1977-02-01), Brock
Feichtner Hanns
Scheikl Peter
Kelman Kurt
Voest-Alpine Aktiengesellschaft
Yuen Henry C.
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