Heating – Processes of heating or heater operation – Including apparatus heat-up – cool-down or protection
Patent
1988-04-19
1989-05-30
Yuen, Henry C.
Heating
Processes of heating or heater operation
Including apparatus heat-up, cool-down or protection
432 48, 432144, 432145, 432152, F27D 700, F27B 900
Patent
active
048346462
ABSTRACT:
A process is provided for cooling fired products such as tiles in a kiln by repeating a cooling step to cool down said products, the cooling step comprising blowing a cooling gaseous fluid, e.g., cooling air, to the fired products in the kiln, alternately with a non-cooling step to moderate a sharp temperature gradient between the surfaces and the interior regions of the products, the non-cooling step comprising stopping or suppressing the blowing of cooling gaseous fluid between cooling steps. The process of the invention can achieve rapid cooling without giving rise to dunting due to thermal stresses and thus can increase the productivity of kilns. When the invention is applied to a tunnel kiln, the kiln can be considerably shortened.
REFERENCES:
patent: 3168298 (1965-02-01), Cook et al.
patent: 3172647 (1965-03-01), Remmey
patent: 4030879 (1977-06-01), Stanasila et al.
patent: 4249895 (1981-02-01), Mantegani
patent: 4285669 (1981-08-01), Walchutter
patent: 4527974 (1985-07-01), Carraroli et al.
patent: 4573909 (1986-03-01), Scanlon
patent: 4588378 (1986-05-01), Yamamoto et al.
NGK Insulators Ltd.
Yuen Henry C.
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