Abstract: A thermochemical treatment installation includes a reaction chamber, at least one gas inlet, and a gas preheater chamber situated between the gas inlet and the reaction chamber. The preheater chamber has a plurality of perforated distribution trays held spaced apart one above another. The preheater chamber also includes, between at least the facing distribution trays, a plurality of walls defining flow paths for a gas stream between said trays.

Abstract: A method and apparatus closing a slag doorway and cleaning the slag doorway and channel of a metallurgical furnace including walls defining a slag doorway and a slag channel that crosses the slag doorway and has a bottom. The apparatus includes a support structure associable with the furnace, at least one slag-breaking body including a lower border that, under mounting conditions of the apparatus on the furnace, is directed towards the bottom and at a definable height, the slag-breaking body being associated with the support structure in a movable manner along the slag channel away and/or towards the slag doorway to wipe, with its lower border, the bottom or a parallel plane, and a vibrating or oscillating mechanism associated with the slag-breaking body to confer a vibrating or oscillating movement with non null component incident the bottom, during a travel performed during its movement away or towards the slag doorway.

Abstract: For the purification of waste gas containing nitrogen oxides in combination with CO, VOCs or nitrous oxide, in particular waste gas resulting from the production of cement clinker, nitric acid, adipic acid, fertilizers and uranium trioxide, a regenerative thermal post-combustion system with at least two regenerators (A, B) is used by means of which the CO, VOCs and nitrous oxide are thermally purified in the combustion chamber (1) at a temperature of 800 to 1000° C. and the nitrogen oxides are thermally reduced with the SCR catalyst (6) by adding a nitrogen-hydrogen compound, wherein the waste gas already thermally purified is removed from the respective two-part regenerator (A or B) at a suitable place at a temperature of approx. 300° C., guided via the SCR catalyst (6) in a constant direction of flow and subsequently fed back to the remaining section (A?, B?) of the regenerator (A or B).

Abstract: A thermally efficient cover for the molten metal held in a furnace, tundish, ladle, crucible or other containment vessel. Through substantially horizontal movement, this cover allows for periodic removal, particularly by retraction, for accessing contents of that furnace from a top aperture in the containment vessel. This invention further relates to a covered furnace system and methods of use.

Abstract: A protective collar for a kiln that has a rigid body portion and a shape and size substantially corresponding to the shape and size of at least a portion of the peripheral edge surface of the kiln sidewall. Depending on the kiln, the protective collar can be round, oval, faceted, or otherwise shaped. The collar can be a complete ring or just a portion thereof. A plurality of stops, which can be fixed or pivoting, spaced along the body portion of the protective collar can prevent dislocation of the collar when applied to the kiln. The stops can be adjustable in location to avoid obstructions on the kiln. A properly selected protective collar can enable a method for protecting the firebrick in a kiln where the protective collar is applied with the shapes of the protective collar and the peripheral edge surface of the kiln sidewall substantially aligned.

Abstract: A slag discharge door apparatus for an electric furnace is disclosed. The apparatus includes a door which is operated by a door operator to open or close a slag discharge outlet of the electric furnace, and a door support which supports the door in such a way that a portion of a lower end of the door overlaps with the door support, so that slag is inhibited from leaking out of the electric furnace through the slag discharge outlet.

Abstract: A CVD device has a reaction furnace (39) for processing a wafer (1); a seal cap (20) for sealing the reaction furnace (39) hermetically; an isolation flange (42) opposite to the seal cap (20); a small chamber (43) formed by the seal cap (20), the isolation flange (42), and the wall surface in the reaction furnace (39); a feed pipe (19b) for supplying a first gas to the small chamber (43); an outflow passage (42a) provided in the small chamber (43) for allowing the first gas to flow into the reaction furnace (39); and a feed pipe (19a) provided downstream from the outflow passage (42a) for supplying a second gas into the reaction furnace (39). Byproducts such as NH4Cl are prevented from adhering to low temperature sections such as the furnace opening and therefore the semiconductor device production yield is therefore increased.

Abstract: A pivoting, liquid cooled slag door for metallurgical furnaces is disclosed. The slag door can pivot from the top using one or more robust mechanisms that enable the door to be moved into and stopped in any position between a closed position and an open position. The slag door can also incorporate wing walls disposed in close proximity to the sides of the slag door. The wing walls can minimize air infiltration into the furnace when the slag door is in an open position. The slag door can be disposed in close proximity to the hearth of the furnace to eliminate problems associate with conventional slag door tunnels. The slag door can be fitted with a furnace apparatus such as a burner or a lance and can be used to provide access to the interior of the furnace and to control the flow of material out of the furnace.

Abstract: A safety door for covering openings in a rotary kiln during maintenance operations on the rotary kiln. The door is affixed to the exterior surface of the rotary kiln and includes a hatch pivotally secured at one side edge thereof by a pivot rod to a frame. A plurality of tension coil springs are disposed on the pivot rod and continuously bias the hatch toward the opening with a force of approximately 400 pounds.

Abstract: A CVD device has a reaction furnace (39) for processing a wafer (1); a seal cap (20) for sealing the reaction furnace (39) hermetically; an isolation flange (42) opposite to the seal cap (20); a small chamber (43) formed by the seal cap (20), the isolation flange (42), and the wall surface in the reaction furnace (39); a feed pipe (19b) for supplying a first gas to the small chamber (43); an outflow passage (42a) provided in the small chamber (43) for allowing the first gas to flow into the reaction furnace (39); and a feed pipe (19a) provided downstream from the outflow passage (42a) for supplying a second gas into the reaction furnace (39). Byproducts such as NH4Cl are prevented from adhering to low temperature sections such as the furnace opening and therefore the semiconductor device production yield is therefore increased.

Abstract: A CVD device has a reaction furnace (39) for processing a wafer (1); a seal cap (20) for sealing the reaction furnace (39) hermetically; an isolation flange (42) opposite to the seal cap (20); a small chamber (43) formed by the seal cap (20), the isolation flange (42), and the wall surface in the reaction furnace (39); a feed pipe (19b) for supplying a first gas to the small chamber (43); an outflow passage (42a) provided in the small chamber (43) for allowing the first gas to flow into the reaction furnace (39); and a feed pipe (19a) provided downstream from the outflow passage (42a) for supplying a second gas into the reaction furnace (39). Byproducts such as NH4Cl are prevented from adhering to low temperature sections such as the furnace opening and therefore the semiconductor device production yield is therefore increased.

Abstract: A portico furnace includes a number of porticos (1), which are arranged parallel to one another and which define the spans of the furnace, and supports (2, 6) that are attached to the porticos (1), between which are positioned interjoists (3) that constitute the walls of the furnace. At least some of the interjoists (3) consist of a chimney block (4) with an axis that is parallel to the supports (2, 6).

Abstract: The invention relates to a gate unit for gas-tight sealing of two adjacent high temperature zones within a high temperature oven, comprising a gate panel displaceable between an open position and a closed position within a guide structure. At least one sealing element is transported with the gate panel. Protecting means can be transported by the gate panel over at least one part of a transport path of the same, by which at least one segment of the sealing element can be protected over at least one part of the displacement path of the gate panel against influences harmful to the sealing element particularly against radiant heat. The invention further relates to a high temperature oven having an oven tunnel comprising a first high temperature zone and a second high temperature zone. The gate panel is disposed in a transition region between the first and the second high temperature zones.

Abstract: A safety door for covering openings in a rotary kiln during maintenance operations on the rotary kiln. The door is affixed to the exterior surface of the rotary kiln and includes a hatch pivotally secured at one side edge thereof by a pivot rod to a frame. A plurality of tension coil springs are disposed on the pivot rod and continuously bias the hatch toward the opening with a force of approximately 400 pounds.

Abstract: An electric arc roof furnace top contains a central portion and a peripheral portion surrounding the central portion. Each of these portions has an inner surface suitable for facing the furnace inner space. The inner surfaces of the peripheral and central portions form together a step so as to raise the inner surface of the central portion in relation to the inner surface of the peripheral portion with respect to the furnace inner space.

Abstract: Each one of the side edges (4a, 4b) of a door (3) is arranged to run inside and along a respective tube (5a, 5b) that has a longitudinal slit (6a, 6b) and extends vertically, in that each tube is fixed in relation to the furnace, in that the tubes (5a, 5b) are designed to spring back towards a respective position in which the slit (6a, 6b) is closed, and arranged to enclose the side edge (4a, 4b) of the door (3) along essentially the whole length of the side edge (4a, 4b) when the door (3) is in its closed position, and in that a liquid coolant is arranged to stream through the tubes (5a, 5b) and essentially fill up the whole space defined by the combination of the inner surfaces of each tube (5a, 5b) and the outer surfaces of the respective side part of the door (3).

Abstract: A portable kiln has a set of wheels, a handle and a platform base. The wheels and the handle are attached on a first side of the kiln so that the kiln can be tilted and rolled on the wheels using the handle. The platform base provides a spaced distance between the wheels and the floor when the kiln is sitting upright in an operational position. The kiln may also include a metal outer shell wrapped about an oven portion. The outer shell has a shell sidewall radially spaced from the oven portion sidewall, which forms an annular air channel between the outer shell sidewall and the oven portion. The outer shell has a C-shaped cross-section and it has upper and lower vent openings for the air channel. A hinge assembly allows a lid of the kiln to rest in an open position.

Abstract: A vertical heat-processing apparatus (1) includes a vertical heat-processing furnace (2) having a furnace port (3), a lid (5) movable up and down to open and close the furnace port, and a rotation mechanism (15) disposed on the lid to rotate a holder (13) that holds a number of target substrates (W). The rotation mechanism (15) includes a rotary shaft (16), and a support unit (19) that supports the rotary shaft (16) rotatably through a bearing (17) and sealing member (18). The rotary shaft (16) has a hollow structure with a thin wall, and is supplied with a cooling gas to flow inside and outside the rotary shaft. The support unit (19) has a cooling passage (32) surrounding an upper portion of the rotary shaft (16), and is supplied with a coolant to flow through the cooling passage.

Abstract: A warp resistant fuel feed door assembly for use in injecting supplemental fuel into a high temperature combustion chamber such as a rotating cement kiln without substantial loss of heat or combustion gases. The apparatus, which is positioned on the exterior side of a fuel passage transecting the wall of a rotating kiln, opens to receive fuel and then seals during the balance of the rotation of the kiln. Warping, bearing fracture, shaft distortion and jamming due to exposure to extreme heat and cooling are minimized by the sectional construction of the doors. The door includes a plate positioned over the mouth of the passage, a plurality of support arms attached to the plate and a hinge shaft attached to the arms. Stresses on the door structure from inconsistent expansion of the plate are reduced due to symmetrically spaced oblong and oversized bolt attachment bores in the support arms. Synchronous opening of the feed doors is achieved by levered rotation of the hinge shafts by an electric motor.

Abstract: A system for sealing a lower edge of a temperature control chamber door to a temperature control chamber housing when the door is closed has a pair of opposed radiused corners provided at opposed lower corners of the door opening, and a resilient seal member having opposed radiused corners substantially complimentary in shape to the radiused corners of the opening.

Abstract: An access door for a boiler or furnace has a water-cooled jacket mounted on a door panel frame for use in high temperature regions of furnaces and boilers. The door is large enough to permit a stretcher to pass through unobstructed. The water-cooled jacket has a series of baffles which direct water in a serpentine path through the jacket. Plant water, as opposed to boiler quality water, may be used to cool the door. A viewing port may be provided in the door as well.

Abstract: The invention relates to a susceptor lid for use in a CVI/CVD furnace. More specifically, the invention is directed to a lid configured to consecutively run CVI/CVD and heat treatment processes without opening the furnace. The susceptor lid according to the invention comprises: a susceptor lid body having a gas exhaust hole, the susceptor lid body having a top surface and a bottom surface; and an exhaust lid disposed over the gas exhaust hole, with a clearance between the exhaust lid and the gas exhaust hole such that exhaust gas pressure within the clearance is approximately equal to, or less than the exhaust gas pressure within the gas exhaust hole, the exhaust lid being positioned to block the majority of the radiation from below the bottom surface of the susceptor lid body.

Abstract: The invention relates to a susceptor lid for use in a CVI/CVD furnace. More specifically, the invention is directed to a lid configured to consecutively run CVI/CVD and heat treatment processes without opening the furnace. The susceptor lid according to the invention comprises a susceptor lid body having a gas exhaust hole; and, an exhaust lid disposed over said gas exhaust hole, said exhaust lid being configured to move within the CVI/CVD furnace from a first position wherein said exhaust lid covers said gas exhaust hole to a second position wherein said gas exhaust lid at least partially uncovers said gas exhaust hole.

Abstract: A water-cooled multipart hood for metallurgical vessels, particularly pouring ladles, with cooling tubes arranged welded tube against tube and/or with gaps between the tubes, with an opening arranged in the cover of the hood for inserting a refractory core piece for guiding electrodes therethrough, and with openings for discharging flue gases. The water-cooled ladle hood further includes a lower outer hood and a lower inner hood with at least three gas exhaust openings and a gas conducting pipe arranged in the lower outer hood, wherein an upper hood with at least three gas exhaust openings, a gas conducting pipe and an opening is arranged in the lower inner hood.

Abstract: A system for eliminating distortion of optical ports during supersonic flight includes an electrohydraulic pump which is controlled by a potentiometer actuated by expansion and contraction of a gas that acts on a piston which is mounted in a cylinder. The cylinder is mounted in thermal contact with a frame which supports one or more layers of optical glass. The electrohydraulic pump operates to pump cooling fluid into the frame thereby cooling the frame and the optical glass when the gas expands as a result of heating during supersonic flight.

Abstract: A casing for a kiln includes at least one casing unit comprising: vertical and horizontal frame members assembled according to the shape of a framework of the kiln; outer plates secured to at least one of the vertical and horziontal frame members for covering the spacings encircled by said vertical and horizontal frame members; guide fittings provided at the spacings between outer plates adjacent in a longitudinal direction of the kiln for slidably supporting the ends of said outer plates; and securing means for securing said outer plates to said vertical frame member or horizontal frame member so that the spacings between the adjacent outer plates are expandable in a longitudinal direction of the kiln.

Abstract: A roller hearth type heat treating furnace has a furnace housing, the inside of which is partitioned into first, second and third treating chambers by a plurality of heat insulating intermediate doors. In order to independently control the temperature inside each treating chamber, the first treating chamber is provided with radiant tubes, the second treating chamber with radiant tubes and a cooler with a fan and the third treating chamber with electro tubes and cooling tubes. The furnace accommodates a series of hearth rollers which can be selectively driven by a plurality of electric motors and a plurality of clutches so that a material located in one chamber may be transported into the adjoining chamber only or successively transported within the furnace.

Abstract: A method and means of heat insulating the opening in a heat chamber, e.g., a soaking pit, comprises applying a cover including an inside lining of ceramic fibres, under a load which is selected so that the fibres contact a peripheral wall of the opening under a pressure which is sufficient to form a seal with the wall but insufficient to cause the fibres to be crushed.

Abstract: A panel 1, 1A, adapted for the flow of coolant, therethrough, comprising coolant flow tubing having a coolant inlet aperture 11C at an inlet end of the coolant flow tubing and a coolant outlet aperture 12A at an outlet end of the coolant flow tubing, characterized in that the coolant flow tubing comprising a plurality of elongate tube lengths 2, 2A, 2B formed from hollow rectangular section material, the tube lengths 2, 2A, 2B being disposed in parallel relationship, either stacked one on top of the other or side-by-side, with adjacent external faces of adjacent top and bottom walls 3, 4 of adjacent tube lengths 2, 2A, 2B abutting one another, with the end of each tube length 2, 2A, 2B closed off, and with coolant flow apertures 11, 11A, 11B, 12, 12A, 12B communicating between adjacent tube lengths 2, 2A, 2B adjacent the ends thereof such that, in use, coolant flows in at one end of each tube length, along the tube length, and out at the other end of each tube length, to and through successive tube lengths of

Abstract: An ingot pusher furnace includes means for reducing heat loss from the charging and discharging ends of the furnace so as to produce a more efficient and uniform heating of the ingots. The pusher furnace includes support rails which extend between a first opening in the front wall and a second opening in the rear wall and terminates inside of the charging and discharging doors. The charging and discharging doors extend below the support rails in their closed position so as to provide a positive seal.

Abstract: A multilayered, cooled metal lid for a heating vessel has a main support plate fabricated from low carbon steel and a chromium steel overlay that is exposed to the hot interior portions of the vessel. The chromium steel overlay has a chromium content by weight of approximately 10 to 25 percent.

Abstract: Apparatus for programmably orienting a semiconductor wafer in an ion implantation system so as to limit channeling and to control the depth of penetration of impinging ions. The apparatus is associated with a processing chamber door and includes a rotatable vacuum chuck for engaging the wafer and a motor for rotating the vacuum chuck and the wafer through a preselected angular displacement. The apparatus further includes a programmable control assembly operative to deenergize the motor upon sensing rotation of the vacuum chuck through the preselected angular displacement. The wafer orientation apparatus is typically utilized in a system for the vertical transfer of wafers between a cassette and a processing chamber.

Abstract: A cover for a top charged melting furnace includes an annular ring of downwardly extending blocks or modules of ceramic fiber insulating material. A plurality of T-bar anchors cooperate with the blocks to provide an anchor system for the annular ring. This anchor system allows the ring's attachment to the cover to be tightened in compensation for heat and compressionally related block size reductions. The anchoring system prevents the ring of blocks from sagging during cover elevation while not interfering with upward movement of the blocks during cover positioning on the furnace. The annular ring of blocks protects the main portion of the cover's insulation from damage and any damaged blocks in the ring are readily replaceable.

Abstract: A flexible cover for a carbon bake pit has a flexible, expanded metal backing to which is attached a blanket of insulating ceramic fibers. This construction allows the cover to flex in order to conform to the surface of the material in the pit. Lifting means are attached to the expanded metal backing in a manner so as to permit this flexibility.

Abstract: An arrangement for sealingly closing an opening of a reaction vessel includes a frame member which bounds the opening and a closing member which is movable between a closing position in juxtaposition with, and an opening position at a spacing from the frame member, as well as a sealing arrangement for sealing the gap between these members in the closing position of the closing member. The sealing arrangement includes an inner seal and an outer seal which define a sealing space filled with a preferably inert gaseous medium. The outer seal includes two sealing elements which extend across the gap in the closing position and define between themselves a confining space, and a liquid seal confined in this confining space. At the upper region, the liquid seal may be confined in an upwardly open horizontal channel and at the lower region it may be contained in a trough-shaped receptacle. The sealing liquid of the liquid seal is preferably circulated through the confining space to act as a cooling medium.

Abstract: Reaction vessels, furnace tubes, heating and cooling enclosures frequently have parts such as access ports, inlet tubes, inspection windows, etc. made of thermally transparent materials such as plastic, glass, quartz, oxides, nitrides and sulfides. When these parts extend outside the hot zone, they can act as "light pipes" carrying appreciable amounts of thermal radiation which can damage thermally sensitive gaskets or other materials used to secure external couplings or end closure flanges to these parts. Thermal radiation induced gasket damage is a frequent cause of stuck flanges and couplings. This problem is avoided by inserting a thermal radiation scattering region in the thermally transparent material between the hot zone and the end closure or gaskets. The thermal radiation is scattered and dispersed, so that the end zones receive less radiation and remain cooler. Milky quartz is a suitable scattering material for use with quartz furnace tubes or bell jars.

Abstract: A process for the ignition of sinter mixtures containing solid fuels and apparatus for carrying out this process. The ignition is effected by means of hot combustion gases which are produced, under certain specified conditions, by the combustion of gaseous or liquid fuel initially in a swirl combustion chamber and then under a hood from where they are suctioned through the sinter mix.

Abstract: A cooling device for a converter opening, such as a Peirce-Smith copper converter, has been disclosed wherein a cooling medium, which is a combustible liquid of high temperature cracking characteristics, is introduced in cooling conduits floatingly disposed in a refractory material lining an opening of a converter, through which, at high temperatures, the contents thereof are discharged. The lower vapor pressure of the cooling medium, the expansion and contraction of the conduit in individual cooling segments and the maintaining of the cooling medium under pressure improves the operation of the converter.

Abstract: A water-cooled furnace cover comprising a plurality of jackets each internally provided with a water channel. These jackets are arranged side by side to form a body portion of the cover. A number of fins extend from a surface of the body portion facing the interior of the furnace so that a slag layer may be adhered to the fins to easily form a heat insulating layer.

Abstract: A metallurgical vessel includes a cylindrical portion which is supported on a ring carrying a tilting spindle which is mounted for pivotal tilting movement of the vessel. The vessel includes a frustoconical mouth portion at its upper end which terminates in a mouth ring of reinforced construction. The construction includes a cooling arrangement for the mouth portion which comprises a plurality of groups of coils which are wound around the mouth portion and which are advantageously wound in the form of a multistart screw thread. Each group of coils includes an inlet and an outlet which is connected to a distributor through suitable valves. This distributor in turn is connected through a main distribution pipe which extends through an opening in the tilting ring and the tilting spindle and is connected to a source of fluid cooling medium through a rotary seal at the outer end of the tilting spindle.