摘要:
A process and a device for charging a primary product for pig iron into a smelting unit are provided. According to the process and device, some of the primary product that has been formed by reducing oxidic iron carriers is stored in the hot state in a reservoir tank before being supplied into the storage device or charging device that is directly connected to the smelting unit.
摘要:
Midway along an outer circulation passage provided outside a heating chamber, a steam generating device is arranged, and, through the outer circulation passage, steam is fed to the heating chamber. A control device controls a steam generating heater arranged inside the steam generating device and a vapor heating heater provided in a space through which an air stream flowing through the outer circulation passage is returned to the heating chamber, and forms a cooking sequence by using, singly or in combination, a first heating mode that uses superheated steam obtained as a result of the steam being heated with the vapor heating heater and a second heating mode that uses hot air or radiation heat obtained by making the vapor heating heater produce heat without supply of steam.
摘要:
After carrying an LCD substrate in a reaction container of a heat treatment unit, blowing a previously heated helium gas from a gas supply part, which opposes to the surface of the LCD substrate, over the entire surface of the LCD substrate. The temperature of the LCD substrate is raised by radiation heat of a heater and heat exchange with the helium gas. After performing CVD or annealing in the reaction container, cooling the LCD substrate by blowing a gas for heat exchange having a temperature about a room temperature from the gas supply part over the entire surface of the LCD substrate. Return the cooled LCD substrate to a carrier in the carrier chamber via a conveyance chamber.
摘要:
The present invention relates to a gas recirculating furnace which aims to enable generation of a high-temperature strong recirculating current and comprises heat sources 3A and 3B for heating a recirculating gas outside the furnace and an out-of-furnace circulating path 4 for taking combustion gas in the inner space of the furnace 18 to the outside of the furnace and flowing it back to the inside of the furnace 18 from a different position. The out-of-furnace circulating path 4 includes: regenerative beds 5A and 5B at recirculating gas current intake and outlet openings 9A and 9B communicating with heating chambers 2; a circulating fan 6; a passage switching device 7 for selectively and alternately connecting an intake side and a discharge side of the circulating fan 6 with one of the regenerative beds 5A and 5B; and a heat removing means 8 for performing heat removal or dilution in order to change gaseity of the gas current in a section between the regenerative beds 5A and 5B, thereby forming inside the furnace 18 a high-temperature strong recirculating current 10 for periodically inverting a flow direction of the gas current by the passage switching device 7.
摘要:
A method and apparatus for introducing an oxidant mixed with a carrier gas into pre-heating zone of a continuous furnace for effectively removing lubricant from powder metal compacts prior to sintering at high temperatures. Mixing a controlled amount of a gaseous oxidizing agent such as moisture, carbon dioxide, air or mixtures thereof with a carrier gas and introducing the mixture into the preheating zone of a continuous furnace under controlled conditions accelerates removal of lubricant from powder metal compacts prior to sintering at high temperature by decomposing lubricant vapors into smaller and more volatile hydrocarbons, produces sintered components with close to soot- and residue-free surfaces and with the desired physical properties, prolongs the life of furnace components including muffles and belts, and reduces downtime, maintenance and operating costs.
摘要:
It is an object of the present invention to provide a vertical heat treatment apparatus having a heat insulator, which has sufficient heat insulation, heat retention and high load pressure bearing properties to cope with increased size dimensions and number of layers of wafer workpieces and can be particularly advantageously used as a semiconductor and TFT substrate heat treatment apparatus. The apparatus features the use of a heat insulator casing 40 supporting a substrate holder 3 on its top and receiving a heat insulator 50 having numerous inner microspaces in its lower space, and defining a substrate holder or boat insulator receiving space A and a heat insulator receiving space B such that these spaces are hermetically sealed with respect to each other by the heat insulator casing. It is also a feature of the apparatus that the heat insulator receiving space B is in communication with the exterior or that the pressure in the heat insulator receiving space B can be reduced or increased through a contact section of a closure member 70 which supports the heat insulator casing 40 or a heat insulator casing flange 41.
摘要:
A gas injection apparatus and process to form a controlled atmosphere in a confined space, comprising at least one assembly of ducts installed in series and/or in parallel, of which at least a part (2, 12, 13) of a duct comprises gas injection apertures. The assembly is supplied by at least one gas supply main (9, 14, 15), each main being connected to the assembly at the level of a primary connection node (8, 16, 17), the dimensions of the assembly observing the following relationship:.SIGMA..omega..sub.i /.SIGMA..phi..sub.i .gtoreq.1, preferably .gtoreq.1.5;wherein .SIGMA..omega..sub.i represents the sum of internal sections of the gas supply mains feeding the assembly and .SIGMA..phi..sub.i represents the sum of the cross-sections of the gas injection apertures of the ducts assembly.
摘要:
A heat treating furnace has a hot zone enclosure with a substantially rectangular cross section. The floor of the hot zone enclosure is formed such that it is removable independently of the remainder of the hot zone enclosure. The heat treating furnace has a heating element with a novel support element that is readily mounted on and removed from the hot zone enclosure and which adjusts to accommodate a wide range of heating element thicknesses and insulation shield thicknesses. The electrically insulating components of the support element are formed to resist electrical shorting resulting from metallization and to resist cracking from thermally induced stress. The heat treating furnace further includes a cooling gas injection nozzle formed to reduce turbulence in the injected gas stream and to be readily attached to or removed from the hot zone enclosure. The gas injection nozzle is preferably formed of a ceramic material and is mounted in an opening in the hot zone enclosure by a very coarse, light-bulb-like, thread formed in the body of the gas nozzle.
摘要:
A method of operating an industrial furnace comprising the steps of; drawing a first gas flow of ambient air into the furnace; removing constituents of the first gas flow to increase the relative oxygen content of the remaining first gas flow, the removed constituents of the first gas flow comprising a second gas flow; firing the furnace using at least part of the remaining first gas flow as an oxidising medium; drawing waste gases from the furnace in a third gas flow; combining the second gas flow and the third gas flow; and releasing the combined second and third gas flows from the furnace.
摘要:
In the present invention dental prostheses are cured without the use of dental flasks using an electrically heated pressure vessel. The dental prosthesis is cured while in a plaster chamber which is placed in a curing container with ambient water. The apparatus includes a perforated table for supporting the curing container during heat curing. The vessel has a lid for sealing the top, an inlet for injection of compressed air, an outlet for exhausting of compressed air, and an electrical resistance heating means for heating water held in the vessel. The curing container holds ambient temperature water at a level which covers the plaster chamber prior to submerging the curing container in the vessel containing water at a temperature of 90.degree. C. to 100.degree. C. The table supports the outing container in the vessel so that the top edge of the curing container is above the level of water held by the vessel. The present invention provides that the plaster chambers with the dental prosthesis inside of it being already aggregated heat curing acrylic, are those which maintain the vertical dimension. They are within the curing container while they are gradually heated by the hot water of the processor. Pressure which could fracture the model and the prosthesis is avoided.