953results about "Preheating charges" patented technology

A pedestal for use in a high temperature vertical furnace for the processing of semiconductor wafers provides a closure and heat insulation for the lower end of the furnace and is a wafer boat support. The pedestal, comprising quartz-enveloped insulation material, supports a wafer boat at a boat support level and is provided with an upper section disposed above the boat support level. The upper section comprises enveloped insulating material. The envelope of the upper section is also formed of quartz and the insulating material in the upper section has a lower thermal conductance than the insulating material in a lower quartz enveloped section.

A substrate heat treatment apparatus includes a heat-treating plate having a flat upper surface, support devices formed of a heat-resistant resin for contacting and supporting a substrate, a seal device disposed annularly for rendering gastight a space formed between the substrate and heat-treating plate, and exhaust bores for exhausting gas from the space. The support devices are formed of resin, and the upper surface of the heat-treating plate is made flat, whereby a reduced difference in the rate of heat transfer occurs between contact parts and non-contact parts on the surface of the substrate. Consequently, the substrate is heat-treated effectively while suppressing variations in heat history over the surface of the substrate.

An oven with a sensor positioned to detect an event that will cause a decrease in the internal temperature of a tunnel. The oven includes a controller configured to increase the thermal output of a heating element in anticipation of the upcoming decrease in the internal temperature. In some embodiments, the oven is a conveyor over and the sensor is positioned to detect a food item approach the tunnel on a conveyor. In some embodiments, the amount of current provided to an electric heating element is increased by increasing the target temperature. In some embodiments, the amount of current provided to the electric heating element is increased by a predetermined offset.

A thermal processing apparatus and method with predictive temperature correction. Distances are measured from a backside of the wafer relative to a reference plane. Heat is transferred to the backside of the substrate in relation to the measured distances. This allows a baking unit to uniformly heat the substrate to compensate for irregularities or warpage.

A Preheater-Steelmaking Furnace and closed loop Process System for semi-continuous melting of integrally preheated recycled or virgin ferrous charge, by using highly energy efficient combustion process of natural gas combusted by oxygen as the main heat source, after preheating of the cold charge, by fully exploiting thermal energies of the melting process off-gases, in a gas tight, low noise, ecologically friendly PSF with scant CO and drastically reduced CO2 in exhaust gases for semi-continuous, batch self-charging, sealed pairs of eccentrically rotating quasi cylindrical, permeable half drums hoppers creating separate preheating chambers.

A heat treating apparatus includes a heating plate for heating a substrate coated with a coating liquid, a cooling plate for cooling the substrate and a heat pipe provided in the cooling plate, a cooling chamber being moved together with the cooling plate by the drive mechanism and accommodating a cooling liquid for cooling one end side of the heat pipe. The apparatus further includes a circulation passage provided in the heat treating apparatus to circulate the cooling liquid in the cooling chamber, a circulation pump for circulating the cooling liquid in the circulation passage; and a heat radiating member provided on the circulation passage to radiate the heat received by the cooling chamber to the outside of the heat treating apparatus.

Tobaccos are cured in a manner so as to provide tobaccos having extremely low tobacco specific nitrosamine (TSNA) contents. Harvested Virginia tobacco is subjected to flue-curing so as to provide flue-cured tobacco. During the curing processing steps, contact of the tobacco with nitric oxide gases, such as those produced as combustion products of propane burning heating units, is avoided. Tobacco in curing barns is not subjected to direct-fire curing techniques, but rather, heat for tobacco curing can be provided by heat exchange or electrical heating methods.

An object of the present invention is to perform temperature setting of a heating plate so that a wafer is uniformly heated in an actual heat processing time. The temperature of a wafer is measured during a heat processing period from immediately after a temperature measuring wafer is mounted on the heating plate to the time when the actual heat processing time elapses. Whether the uniformity in temperature within the wafer is allowable or not is determined from the temperature of the wafer in the heat processing period, and if the determination result is negative, a correction value for a temperature setting parameter of the heating plate is calculated using a correction value calculation model from the measurement result, and the temperature setting parameter is changed.

The invention relates to a high temperature energy-saving tunnel kiln for physical thermal circulation application. A metal tube type air preheater is arranged in a medium temperature section furnace cavity in a tunnel kiln cooling zone; a silicon carbide air preheater made from non-metallic material is arranged in a high temperature section furnace cavity in the tunnel kiln cooling zone; wherein, one end of the metal tube type air preheater is connected with a blower and the other end thereof is connected with the silicon carbide air preheater; the other end of the silicon carbide air preheater is connected with a high temperature airpipe; then preheated combustion-supporting air is connected to a high temperature combustor by a high temperature airpipe air valve through the high temperature airpipe air; a group of forced cooling blowers are arranged at the low temperature section of the cooling zone to blow wind to the high temperature zone and high temperature blowers are arranged at the medium temperature section of the cooling zone to pump hot air to a gas pipe mounting groove to heat coal gas, excess heat in the gas pipe mounting groove is connected to a blank drying room and a blank drying shed by a pipeline; wherein, the blower arranged at a preheating zone pumps excess heat and waste gas from the cooling zone and a burning zone, which enters the blank drying shed by the pipeline.

A method and an apparatus (50) for producing direct reduced iron (37) from dry pellets (25) composed of iron oxide and carbonaceous material. A mixture of pellets (25) and free coke particles (38) with weight relation from 3:1 to 5:1 is fed into the top of an electrothermal fluidized bed (32) that is fluidized by nitrogen. By exposing pellets (25) in the electrothermal fluidized bed (32) to temperatures of between approximately 850-1,100° C. for an average period of between approximately 15-60 minutes, the volatiles are removed and the pellets (25) metallized. Reduced pellets (37) mixed with free coke (38) are discharged from the bottom of fluidized bed (32) and cooled. The reduced iron pellets (37) are physically separated from any free coke (38) and the free coke (38) is recycled back into the fluidized bed (32).

A method for heating a wafer to a predetermined temperature, the wafer being held by a holding unit and being accommodated in a processing container equipped with a heater. The wafer is heated to a processing temperature while positioning the wafer at an adjacent position that results form making the wafer approach the heating surface of the heater. After heating the wafer to the predetermined temperature, the wafer is separated from the flat bottom surface of the container body to a processing position. In this state, a processing chamber of the processing container is supplied with a processing fluid, while the holding unit and the heater are relatively moved close to and apart from each other intermittently or continuously. Accordingly, it is possible to quickly heat the substrate to a processing temperature while supplying the substrate with the processing fluid uniformly. This improves throughout and the homogenization in processing.

The invention discloses a device for preheating and conveying scrap steel, which comprises a conveying groove (1) obliquely formed relatively to the horizontal plane. A fume guide hood (2) is arranged on the conveying groove (1); the lower end of the conveying groove (1) extends into an electric furnace (A) through an opening on a side wall of the electric furnace (A); a bottom-open long distributing groove (D) is formed above the other end of the conveying groove (1) and is installed above a material receiving section of the conveying groove (1) through a lifting device (Q); the bottom-open long distributing groove (D) is in a top view projection of the material receiving section of the conveying groove (1) along a longitudinal direction; the scrap steel is longitudinally arranged at the groove bottom of the material receiving section of the conveying groove (1) in the form of strips; and the scrap steel (C) is fed into the electric furnace (A) through the conveying groove (1). The device has small length, high heat exchanging efficiency, low lifting operation rate, small wear and maintenance, energy conservation and environment friendliness, lowers investment and operation costs and uses new energy-saving and environment-friendly technology with popularization value on smelting processes, such as the electric furnace and the like.

The invention relates to a dental furnace wherein a firing chamber is heated up in a first heating-up period at a first heating-up rate of more than 50° K/min, in particular more than 100° K/min, which heats the furnace to at least 1000° C., in particular to 1100-1250° C. The first heating-up period is followed by an intermediate heating period, which is at least five minutes long, in particular at least ten minutes long, the gradient or heating-up rate of which is adapted to the material to be sintered in the dental furnace (10), and wherein this is followed by an end heating-up period (44) during which heating up is effected at a heating-up rate of more than 30° K/min, in particular approximately 50° K/min, and wherein during this the furnace temperature is held for at least five minutes, in particular for at least 25 minutes, above the temperature toward the end of the first heating-up period, and wherein forced cooling of the furnace (10) is performed after this.

A system and method for processing large area substrates is provided. In one embodiment, a processing system includes a transfer chamber having at least one processing chamber and a substrate staging system coupled thereto. The staging system includes a load lock chamber having a first port coupled to the transfer chamber and a heat treating station coupled to a second port of the load lock chamber. A load lock robot is disposed in the load lock chamber to facilitate transfer between the heat treating station and the load lock chamber.

The invention discloses an oxygen-enriched combustion domestic ceramic roller kiln waste-heat utilization hot-air preheating system. The oxygen-enriched combustion domestic ceramic roller kiln waste-heat utilization hot-air preheating system comprises hot air acquisition pipelines, a first conveying pipeline, an induced draft fan, a second conveying pipeline, a branch conveying pipeline, and a hot air distributor which is arranged in a roller kiln preheating zone; multiple hot air acquisition pipelines are arranged at a plurality of positions in a cooling zone kiln body of the roller kiln; the hot air acquisition pipelines are communicated with the first conveying pipeline; an inlet/outlet of the induced draft fan is communicated with the first conveying pipeline and the second conveying pipeline respectively; an outlet end of the second conveying pipeline is communicated with the hot air distributor which is arranged in the roller kiln preheating zone through the branch conveying pipeline; the hot air distributor is arranged at the upper and lower ends of a rod in the kiln; and flow regulation gates are arranged on the hot air acquisition pipelines and the branch conveying pipeline. The hot air in the cooling zone is exhausted and is uniformly conveyed to a preheating zone in the kiln through the air distributor, so that the temperature distribution on the section of the kiln is uniform, the overall heat efficiency is improved by 5-25 percent, and the fuel is saved by 5-15 percent.

The invention discloses a scrap steel pre-heating conveyor with a short process, comprising a conveying trough (1) which is provided with a fume guiding hood (2) and is inclined relative to the horizontal plane. The lower end of the conveying trough (1) extends into an electric furnace (A) via an opening on the sidewall of the electric furnace (A); a bottom-opened long distributing trough (D) is arranged above the other end of the conveying trough (1), is arranged above a material receiving section of the conveying trough (1) by a swing device (Q), and is arranged in the downward projection of the material receiving section of the conveying trough (1) longitudinally; and scrap steels (C) are longitudinally arranged at the bottom of the material receiving section of the conveying trough (1) in a strip shape, and then the conveying trough (1) conveys the scrap steels (C) into the electric furnace (A). The scrap steel pre-heating conveyor with a short process is short, has high heat exchange efficiency, low operation rate of a crane, small abrasion, less maintenance, energy conservation, environment protection and reduces investment and operation cost, thus the invention is a new energy-saving and environment-friendly technology with promotional value in smelting technique, such as electric furnaces and the like.

The invention discloses a system and a method utilizing flue duct waste gas of a hot air furnace to bake and preheat charging of a blast furnace. The system includes a storage bin, wherein a feed opening of the storage bin is provided with a sealing cover device; an air inlet of the storage bin is sealed and communicated with an outlet end of an air inlet channel; an induced draft fan is arranged on the air inlet channel; an exhaust opening of the storage bin is sealed and communicated with an inlet end of an air exhaust channel; and an exhaust fan is arranged on the air exhaust channel. The method includes the steps as follows: A), loading the storage bin with the charging, and closing the sealing cover at the feed opening and an air supplementing control valve; B), opening an induced draft control valve, starting the induced draft fan and the exhaust fan, introducing flue duct waste gas in the hot air furnace into the storage bin through an induced draft pipeline, and directly baking the charging; C), closing the induced draft control valve and opening the air supplementing control valve, enabling air to enter the storage bin through an air supplementing pipeline, and further quickly discharging residual waste gas in the storage bin through the air exhaust channel; and D), stopping the induced draft fan and the exhaust fan, and discharging the charging in the storage bin. The system and the method provided by the invention are mainly used for baking and preheating the charging in the blast furnace through the flue duct waste gas of the hot air furnace.