This invention provides a high temperature vacuum furnace including a hot zone designed for improved energy efficiency resulting in lower electrical power usage, lower manufacturing costs and easier replacement of components for lower maintenance costs. The hot zone has an outer supporting wall and an inner insulating wall surrounded by a new HEFVAC high density, high strength, low conductivity and low moisture-sensitive graphite insulation board ring connected in a unique z-shaped arrangement that contains radiant energy within the hot zone during the heat treating cycle. The hot zone further includes heating elements made of high quality graphite for increased thermal efficiency of the furnace. Also included in the hot zone are lower mass, tapered graphite nozzles that can sustain high pressure gas flow and decrease conductive heat losses from the nozzles to the hot zone chamber outer supporting wall during the heat treating cycle.

A sidewall for a metallurgical furnace and a metallurgical furnace having the same are described herein. In one example, a sidewall of a metallurgical furnace is provided that includes an outer wall, a hot plate and a buckstay. The hot plate is coupled in a spaced apart relation to the outer wall. The buckstay is mechanically coupled to the outer wall and the hot plate. The buckstay includes a buckstay web extending from a buckstay flange. The buckstay web includes a first end coupled to the buckstay flange, and a second end mechanically and movably coupled to the hot plate.

The current invention relates to the field of process furnaces design and can be used in oil refining industry, steam boilers and furnaces for heating feedstocks. A body of a process furnace, comprising an internal lining, is also provided with an outer protective coating which is discrete and structurally heterogeneous. The irregularity of the coating structure is provided by a filler. The invention makes it possible to reduce fuel consumption by reducing heat emission and heat loss from a furnace body into the surrounding environment.

A method of producing steel by charging a furnace with scrap metal and agglomerated oxy-carbon material into a workspace of a furnace, to reduce specific electricity consumption when melting. Increasing the iron output quantity by inputting electric energy, fuel, a carburizer, a flux and gaseous oxygen, using electric arc melting with decarburization of a metal bath, and releasing metal and slag from the furnace. Prior to melting, a portion of the material is loaded with a first portion of the metal charge into the central zone of the furnace, and the remaining material into the melted charge during melting 0.5-10 kg/min per 1 megavolt-ampere of electric arc transformer power. The oxy-carbon material size is between 5 and 80 millimeters.

A shield for injection lances in metal production furnaces facilitates the adjustment of the contents of the melt in the metal production furnace. The shield has an outer shell joined to an inner shell by a face plate. The outer shell and inner shell define a fluid chamber between them and the face plate has an inlet aperture and an exit aperture for coolant flow through the fluid chamber. The shield is sized and shaped to fit into or around an aperture in the wall of the furnace. The shield has apertures through it to facilitate introduction of additives to the melt in the metal production furnace.

A thermal insulation structure is disposed at an exterior of a chamber of a heating device. The thermal insulation structure includes a heat conduction layer, a heat storage layer and a reflection layer. The heat conduction layer is adapted to conduct heat from the chamber to the heat storage layer. The heat storage layer is adapted to store heat. The reflection layer is adapted to reflect radiation heat back to the chamber, whereby a temperature of the chamber could be kept at a constant so as to reduce heat dissipation of the chamber.

The present invention provides a high temperature vacuum furnace that includes a prefabricated solid tongue-and-groove HEFVAC insulation ring assembly hot zone with significantly reduced overall mass, resulting in increased energy efficiency, faster heating and cooling cycles, reduced electricity costs, and expedited maintenance capability thus resulting in lower maintenance costs. The present design eliminates the prior art heavy, fully enclosed metal support ring designed to ensure retention of the insulation shield packages, including all retainer pins and nozzles in place during the heating and high pressure gas quenching cycles, found in prior art vacuum furnaces. The prior art metal support ring is replaced with a bottom support structure whose mass is approximately 80-85% less than the mass of the old support ring. Reducing the mass within the furnace chamber reduces the time and energy it takes to heat and cool the furnace components and the workload being heat treated. Decreased time in the furnace improves production turnaround and lowers energy costs for each heat treating cycle. In one embodiment the prefabricated HEFVAC insulation assembly outer surface contains a very thin stainless steel sheet of approximately 0.030 inches thick, which acts as a low emissivity reflective shield between the prefabricated insulation board ring assembly and the outer water-cooled furnace chamber wall. In another embodiment the prefabricated HEFVAC insulation assembly has no stainless steel sheet on its outside surface adjacent to the furnace plenum and the outer water-cooled furnace chamber wall. The present furnace is easier and less expensive to manufacture compared to prior art vacuum furnaces, and requires less energy to operate.

An analytical device has an oven arrangement (1) with an oven (2), an insulation system, a ventilation system and a housing. The ventilation system has a first convection system that uses natural convection, arranged to keep the housing cool, as well as a second convection system that uses forced convection, arranged to reduce the temperature in the oven (2). In particular, the analytical device is a component of a Karl Fischer titration instrument.

A double insulating wall structure heating furnace capable of preventing its inner pipe whose strength has decreased due to high-temperature heating from being damaged. A double insulating wall structure heating furnace 1 includes an outer pipe 2 and an inner pipe 3 disposed inside the outer pipe 2, in which a sealed space 8 formed between the outer and inner pipes 2 and 3 is depressurized and a heating space 13 formed inside the inner pipe 3 is heated, and in which a tubular reinforcing member 6 is disposed so as to cover an outer circumference of the inner pipe 3, the tubular reinforcing member being formed of a material having a higher heat resistance and a higher strength than those of the material of the inner pipe 3.

A system and method for repairing a coke oven having an oven chamber formed from ceramic bricks. A representative system includes a insulated enclosure insertable into the oven chamber and includes removable insulated panels that define an interior area for workers to work in. The insulated enclosure is movable between an expanded configuration and a compact configuration and moving the enclosure to the expanded configuration will decrease the distance between the insulated enclosure and the walls of the oven chamber. Removing the panels exposes the ceramic bricks and allows workers within the interior area to access and the bricks and repair the oven chamber while the oven chamber is still hot. A loading apparatus lifts and inserts the insulated enclosure into the oven chamber. The insulated enclosure can be coupled to additional insulated enclosures to form an elongated interior area.