GB311316A - Improvement in kilns - Google Patents

Abstract

311,316. Robertson, H. M. May 9, 1928, [Convention date]. Tunnels kilns.-In a kiln, more particularly adapted for the continuous firing and glazing of ceramic goods, hot air and combustion products are drawn through the preheating and firing zones in the same direction as the goods under treatment. The kiln shown comprises preheating firing, and cooling zones 8, 9, 10 with main and supplementary fire places 14, 19, and salt glazing fire-places 20 in the firing-zone, air heating pipes 31 at the sides of the cooling-zone, and flues 42 in the roof of the firing and preheating zones by which air from the pipes 31 can be supplied to delivery conduits 43 spaced along the preheating zone. The products from the fireplaces and the air from the preheating zone are exhausted by a fan 26, Fig 7, through headers 21 and pipes 25. One side wall of each fireplace 20 is inclined as shown, and between the fireplaces and the exhaust headers 21 are wall recesses 28, which promote mixing and circulation of the gases. The fireplaces 14, 19 deliver into the kiln chamber through secondary combustion chambers having perforated walls 17 on the sides facing the tunnel. Roofs; walls.-The passages 42 in the roof are formed by partitions 6<d> between inner and outer arches 6<c>, 44 and the two innermost passages are connected to the end delivery conduits 43 and so on in succession along the length of the preheating- zone. The arch 44 may be covered with insulating-material 45. The side walls of the kiln are formed by inner and outer walls 2<a>, 2<b> with an interposed filling 2<c> of insulating-material.