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 heat treating furnace of the type used in semiconductor manufacturing having a housing with a tubular and cylindrical inner layer constructed of ceramic fiber. Electrical heating elements are supported by the inner layer while a microporous silica layer surrounds and is in contact with the ceramic fiber layer. A rigid cover surrounds the microporous silica layer.

An electrically powered furnace may include a furnace housing and heating elements extending in the furnace housing. The furnace also may include heating tubes extending in the interior volume, and each of the heating tubes may define an interior passage positioned to receive and heat the feed as the feed passes through the interior passage. The heating tubes may be positioned in the furnace housing to receive heat radiated from the heating elements, and the heating tubes may be arranged in one or more of at least two rows or at least two columns and such that each of the heating tubes is substantially equidistant from three or more of the heating elements. A method may include supplying a feed to the heating tubes, heating the heating tubes via the heating elements, and heating the feed via as the feed passes through the heating tubes.

A heat treatment furnace may include: a furnace body comprising an entrance, an exit, and a heat treatment space having a temperature-rising space and a temperature-maintained space that are configured to thermally treat a plurality of objects; conveying plates on which the plurality of objects is to be placed; a pusher configured to push the conveying plates in a front direction from the entrance to the exit of the furnace body; and a plurality of heaters extending in an up-down direction and aligned in the front direction in the heat treatment space. Each of the plurality of heaters may include a heating part configured to generate heat. Positions of the heating parts of the plurality of heaters in the up-down direction may vary from the heater closest to the entrance toward the heater closest to the exit.

Electric stove for heating a reducing gas, the electric stove including: a hollow metal shell body extending along a longitudinal direction; a refractory lining arranged on an inner surface portion of the shell body; a plurality of bricks arranged in adjacent layers extending along the longitudinal direction, where each brick includes a plurality of cavities extending straight along the longitudinal direction through the respective layer, where the cavities of adjacent layers are aligned to one another, whereby a plurality of channels for conducting the reducing gas is formed; and a plurality of heating wires for heating the reducing gas, wherein each heating wire has a diameter smaller than a diameter of a channel, and where each heating wire extends at least partially through at least one corresponding channel of the plurality of channels, such that when the electric stove is operated, a predefined heat amount is dissipated by each heating wire to a reducing gas flowing around the heating wire.

An assembly configured to be used in an electric resistive heating system or an electrically heated thermal energy storage system to heat air or gas, the assembly comprising an electrically insulating brick. The electrically insulating brick including a solid portion; and a hollow interior region. There is an electrically conductive brick, configured to be disposed within the hollow interior region of the electrically insulating brick.

Systems and methods are provided for a high performance heater. In an embodiment, the high performance heater comprises a first stackable tray comprising a first alignment pin that insulates a first heating element disposed in the first stackable tray; a second stackable tray comprising a second alignment pin that insulates a second heating element disposed in the second stackable tray, wherein a top of the first alignment pin fits in to a cut out of a bottom of the second alignment pin when the first and second stackable trays are stacked, and wherein the first and second stackable trays comprise one or more materials, an outer diameter and an inner diameter, and wherein an area between the outer diameter and the inner diameter of the stackable trays comprises at least one cut out portion that allows expansion of the material(s) when the high performance heater is at high temperatures.

The present invention relates to a process of making power-saving electric stoves, particularly having a large size and outer shapes similar to the conformations of traditional Tyrolean heaters or stoves, while having a very light weight and being easily movable to multiple locations of a house. The main characteristic of the present invention is that it includes making a hollow stove body, particularly having a large size, from expanded polystyrene or a similar thermoplastic polymer, with the application of an electric resistor, particularly a constant-power, and hence low-power consuming heating cable arranged around its outer surface in one or more coil loops with the interposition of a layer of adhesive material with at least one thread formed therein for supporting said resistor, with contiguous insulating grooves, and with later application of a final coating layer, made e.g. of fire-resistant cement mortar, whose outer surface may be provided with decorative designs or finishes and ornaments made of wood or other materials, which designs and ornaments may be similar to those formed on the outer surfaces of traditional Tyrolean stoves, whereas the basement of said hollow body is preferably supported by a smooth metal plate, allowing displacement thereof to any location of the house, proximate to a power outlet.

A graphitization furnace includes a furnace body, an upper lining, an insulating lining, a lower lining, a positive electrode and a negative electrode. The upper lining, the insulating lining and the lower lining are all disposed as attached to an inner wall of the furnace body, and the upper lining, the insulating lining and the lower lining sequentially abut against one another along a direction from top to bottom, and the upper lining, the insulating lining and the lower lining are all substantially provided with first through holes with a common axis. The positive electrode is substantially disposed vertically, a lower end of the positive electrode is disposed within the upper lining, the negative electrode is substantially disposed horizontally, and a middle part of the negative electrode is provided with a second through hole for passing raw ingredients.

A furnace for performing a thermal treatment of a continuously moving metal strip includes: a hybrid wall lining facing inwardly of the furnace, the hybrid wall lining including a stack of polycrystalline fibre modules, and graphite lintels being fixed between or in the polycrystalline fibre modules; and electric heating elements provided inside the furnace along one or more vertical walls, and fixed on a side of the hybrid wall lining facing inwardly of the furnace. The polycrystalline fibre modules include fibres with at least 95% of Al2O3 so as to be compatible with a hydrogen protective atmosphere, a thickness of the polycrystalline fibre modules being between 200 and 500 mm. The electric heating elements are attached to the graphite lintels by a first anchoring system. The graphite lintels protect the electric heating elements against strip deviations by being cantilevered above the electric heating elements and protruding from the hybrid wall lining.