Abstract:
A rotary batch preheating kiln feeding batch materials to a batch liquefying vessel is separated from the liquefying vessel by a transition section including duct means to direct exhaust gas from the liquefying vessel to the interior of the rotary kiln at a location spaced from the discharge location of the kiln. The transition section also shields the rotary kiln from radiant heat from the liquefaction vessel.
Abstract:
In a method of liquefying glass batch the initial step of melting glass, converting particulate batch materials to a partially melted, liquefied state, is carried out on a support surface of batch. As liquefied batch is drained from the surface, additional batch is fed onto the surface to maintain the volume of the stable mass of batch substantially constant.
Abstract:
A shaft kiln, especially a shaft kiln for the manufacture of mineral wool, and comprising a kiln chamber (1) with a primary (1a) and a secondary (1b) burning zone and inlets (4) for primary comubstion air (4a) and inlets (5) for secondary combustion air (5a), is provided with a downwards from above in the kiln shaft axially displaceable air injection pipe (6) for feeding additional secondary combustion air (6a) into the secondary burning zone (1b) thus essentially improving the reduction of the emission of H2S (hydrogen sulphide) and CO (carbon monoxide) through the kiln exhaust gases.
Abstract:
The invention relates to a furnace for producing a melt for mineral wool production comprising a shaft (2) for preheating and melting of the raw material (6); a water-cooled grate (5) disposed in the bottom portion of the shaft, which supports a bed of ceramic filling bodies (4) as well as the raw material (6); a combustion chamber (3) disposed underneath the shaft (2), which has a bottom portion (11) for collecting the melt (14) dripping from the shaft (2) and an outlet (12) for melt tapping; and at least one main burner (9) disposed in the combustion chamber (3); as well as auxiliary burners (10) disposed above the grate (5). The bottom surface of the combustion chamber (3) is larger, preferably 20 to 400% larger than the cross area of the shaft (2).
Abstract:
A method of preparing a melt for the production of mineral wool wherein raw material for the melt is heated in a shaft furnace by combustion of coke while introducing oxygen-containing air through the tuyeres of the shaft furnace, and wherein part of the heat required is provided by introducing and combusting a mixture of oxygen and fuel in the central portion of the shaft furnace. A shaft furnace for carrying out the method comprises a burner pipe for introducing and combusting a mixture of oxygen and fuel in the central portion of the furnace chamber.
Abstract:
Method of preparing a melt for the production of mineral wool wherein suitably composed raw material and coke are fed into a preheating zone in the upper portion of a shaft furnace and are caused to descend down through the oxidation zone in which air is introduced to effect a combustion of the coke and to heat the raw material to a temperature not exceeding 1000 DEG C, and wherein the actual melting is effected by plasma heating in the lower portion of the shaft furnace where which the melt formed is discharged.