Abstract:
A method is described for preheating annealing material (4, 5) in a hood-type annealing system, comprising annealing bases (1, 2) which accommodate the annealing material (4, 5) under a protective cover (7) in a protective gas atmosphere, with the annealing material (4) to be subjected to a heat treatment in a protective cover (7) being preheated with the help of a gaseous heat carrier which flows in a cycle around the protective covers (7) on the outside and absorbs heat from annealing material (5) which is already heat-treated in a protective cover (7) and emits it to the annealing material (4) to be preheated in the other protective cover (7). In order to achieve advantageous utilization of the thermal energy it is proposed that for the heat treatment of the annealing material (4, 5, 6) at least one further annealing base (3) is used which comprises a protective hood (7) which is heatable from the outside by a burner (15), and that the hot exhaust gases from the heating of the protective hood (7) are admixed into the heated heat carrier for preheating the annealing material (4).
Abstract:
An apparatus for heat treating a work item includes a cover member and a base member on which the cover member is supported. A work space is defined between the base member and the cover member for receiving at least one work item which is positioned therein. A seal member is located between the base member and the cover member for sealing the work space against the entry and exit of gas. A valving system is provided for regulating the entrance and exit of a gas to and from the work space. The valving system is in fluid communication with the work space and includes a relief valve member for allowing the exhaust of the gas from the work space when gas pressure therein exceeds a predetermined limit.
Abstract:
Apparatus for supporting a charge in a high temperature annealing furnace which comprises a plurality of components arranged in combination for easy replacement of any component or the entire assembly. The apparatus includes a refractory tray which is sealed from the gaseous atmosphere of the heating chamber by a unique arrangement of the component parts of the base assembly including separable top and bottom plates and a compartmented seal trough.
Abstract:
A jacket extends around the refractory wall of a gas-fired kiln and defines an air chamber within which air is heated by the heat from the wall prior to being delivered to gas-air mixers and used as combustion air. Ceramic burner blocks are fitted within the wall and are formed with specially designed fuel delivery passages which cause ignition of the fuel mixture to be delayed until the mixture is nearly within the work chamber of the kiln and which also, in one embodiment of the invention, direct the resultant flame around the wall of the kiln.