A top-loading vertical kiln, a front-loading vertical kiln, and a vertical kiln retrofit kit are described. Each include a baffle having a central aperture and a plurality of rods spaced apart from each other and configured to rest in corresponding detents in a top surface of the baffle, wherein the detents include pairs of detents with a first detent of a pair being formed on a first side of the aperture and a second detent of the pair being formed on a second side of the aperture opposite the first side.

A hood for a taphole and a tapping spout in a submerged arc furnace in the production of silicon. The hood has at least two suction ducts which are placed asymmetrically on either side of the hood, and is useful in a process for the production of silicon in a submerged arc furnace, wherein liquid silicon and refining gas escape from a taphole of a crucible, wherein the liquid silicon flows on a tapping spout into a ladle, wherein the refining gas is sucked in a hood which has at least two suction ducts which are placed on either side of the hood.

A hybrid metal melting furnace uses a furnace lid to hold molten metal, while inhibiting reduction in the service life of burners of the furnace lid caused by long periods of exposure to high heat. This hybrid metal melting furnace includes a crucible for accommodating metal to be melted; and an induction coil causing induced current to flow through and heat the metal. A furnace lid which closes an opening in the crucible includes: a first furnace lid having burners for injecting flames into the crucible; and a second furnace lid which does not have the burners. When melting the metal, the first furnace lid is disposed in a position in which the opening is closed. When holding the molten metal in the crucible, the first furnace lid is removed from the opening, and the second furnace lid is disposed in the position in which the opening is closed.

A hybrid metal melting furnace uses a furnace lid to hold molten metal, while inhibiting reduction in the service life of burners of the furnace lid caused by long periods of exposure to high heat. This hybrid metal melting furnace includes a crucible for accommodating metal to be melted; and an induction coil causing induced current to flow through and heat the metal. A furnace lid which closes an opening in the crucible includes: a first furnace lid having burners for injecting flames into the crucible; and a second furnace lid which does not have the burners. When melting the metal, the first furnace lid is disposed in a position in which the opening is closed. When holding the molten metal in the crucible, the first furnace lid is removed from the opening, and the second furnace lid is disposed in the position in which the opening is closed.

The present invention provides an electric furnace including: a cylindrical furnace wall; a furnace cover that is provided at an upper end of the furnace wall; and a furnace bottom that is provided at a lower end of the furnace wall and includes a deep bottom portion and a shallow bottom portion as a region having a height of 150 mm to 500 mm from a deepest point of the deep bottom portion, in which a slag pouring port into which molten slag or a solidified slag lump is capable of being poured from a slag transport container directly or through a tilting trough is provided, the slag pouring port overlaps the shallow bottom portion in a plan view, and the area ratio of the shallow bottom portion to the furnace bottom in a plan view is 5% to 40%.

A flame holder system includes a support structure configured to support a plurality of burner tiles within a furnace volume. The support structure includes a frame supporting a support lattice. A number of burner tiles are arranged in an array on the support lattice. The support structure is configured to be assemblable without tools inside the furnace volume, using components that are sized to fit through an access port in a wall of the furnace.

A flame holder system includes a support structure configured to support a plurality of burner tiles within a furnace volume. The support structure includes a frame supporting a support lattice. A number of burner tiles are arranged in an array on the support lattice. The support structure is configured to be assemblable without tools inside the furnace volume, using components that are sized to fit through an access port in a wall of the furnace.

A system and/or method for heat treatment of substrates. The system includes a housing that defines a heating chamber and a door assembly that encloses an opening of the heating chamber. The door assembly may be opened and closed. When opened, the door assembly defines a loading slot for loading substrates into and unloading substrates from the heating chamber. The door assembly is coupled to a first actuator and a control unit is coupled to the actuator to move the door assembly between a plurality of loading positions. The system may also include a loading assembly mounted to the door assembly to facilitate insertion and removal of substrates from the heating chamber.

An efficient method of installing an access door in a high temperature structure having an outer door casing spaced from an inner door liner, wherein the casing and liner are aligned to thereby define a passageway through a wall of the structure. The space between the casing, the liner and the structure wall is filled with compressed insulation, and this filled space is temporarily closed off with liner insert plates which thereby compress the insulation and provide a temporary door casing frame. The replacement prehung door assembly is installed in this surrounding temporary door casing frame, and the doorframe assembly is secured to the inner door liner, and thereafter the temporary insert plates closing off the space between the door casing and door liner are removed thereby permitting the compressed insulation in the space between the casing and the liner to expand and engage the doorframe assembly.

The analyzer of the present invention is specifically adapted to provide moisture determinations for foods and other agricultural material. It allows the operator to introduce a precise weight of sample into a crucible in a closed furnace in a controlled environment through an access port in the furnace cover. The access port in the cover can be tapered to allow easy access to an underlying aligned crucible and allow an operator to add and remove sample material from the crucible until a precise desired sample weight is reached as measured by a balance within the furnace. The access port is enclosed by an insulated cover after the samples are sequentially placed in the crucibles.