Tunnel kiln adapted for firing frost-resistant bricks in a reduc

Details Tunnel kiln adapted for firing frost-resistant bricks in a reduc Tunnel kiln adapted for firing frost-resistant bricks in a reduc

1987-07-16

1988-09-27

Favors, Edward G.

Heating

Having condition responsive control

Of cooling, dilution, withdrawal, bypass or circulation of...

432 77, 432144, 432159, 432136, 432241, 432242, F27D 1900

Patent

active

047738510

ABSTRACT:
Cermic materials (i.e. architectural face-bricks) are fired in a tunnel kiln of the type having a firing zone and a downstream cooling zone. The cooling zone is segregated into indirect and direct cooling zones via a sealed gate structure therebetween. The heated gases in the indirect cooling zone are thus preliminarily cooled by suitable means (for example, a heat exchanger) and the cooled gases are returned via a closed-loop path to the indirect cooling zone. The fired ceramic materials in the direct cooling zone are finally cooled by the direct introduction of an oxygen-rich gas (i.e. ambient air). In such a manner, a reducing atmosphere may be maintained in the firing zone and in the indirect cooling zone while final cooling of the bricks occurs in the direct cooling zone. Thus, the oxygen-rich atmosphere of the direct cooling zone is prevented from entering the indirect cooling zone via the sealed gate structure thereby permitting frost-resistant bricks to be fired and cooled on a continual basis.

REFERENCES:
patent: 2736943 (1956-03-01), Cremer
patent: 2899189 (1959-08-01), Matis et al.
patent: 3108351 (1963-10-01), Hermans

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