Abstract

[Problem] To provide a metal heating furnace and a method for combusting ammonia by using a metal heating furnace, whereby it becomes possible to combust ammonia while effectively reducing nitrogen oxides. [Solution] Provided is a metal heating furnace 10 in which ammonia is combusted as a fuel with fire F from a burner nozzle 31 provided in a furnace wall 11. The metal heating furnace 10 is provided with: a plurality of ammonia injection nozzles 41, 42, 43 which are arranged at intervals in the fire F-extending direction in a ceiling wall 13 and through which ammonia is injected in a direction orthogonal to the fire F-extending direction; and a control device 100 which adjusts the amounts of ammonia to be ejected through the ammonia ejection nozzles 41, 42, 43 for every ammonia ejection nozzle 41, 42, 43.

IPC Classes  ?

• F27D 7/02 - Supplying steam, vapour, gases or liquids
• F23C 1/00 - Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in air
• F23C 99/00 - Subject matter not provided for in other groups of this subclass
• F23D 14/02 - Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
• F23J 7/00 - Arrangement of devices for supplying chemicals to fire
• F23K 5/00 - Feeding or distributing other fuel to combustion apparatus
• F23N 1/00 - Regulating fuel supply
• F27B 5/16 - Arrangements of air or gas supply devices
• F27B 5/18 - Arrangement of controlling, monitoring, alarm or like devices

Abstract

[Problem] To provide an industrial furnace that can combust ammonia effectively and facilitate reduction in nitrogen oxides. [Solution] An industrial furnace 1 uses flame F from a burner 10 to combust ammonia which is supplied along with combustion air and fuel gas to the burner 10. Tips of tube-shaped ammonia injection nozzles 21, 22, 23, 24, which are arranged in communication with the wall surface of a furnace body 2 in the furnace 1 and which are provided so as to inject only ammonia, are protruded inward to the furnace body 2 from the wall surface. The entirety of the ammonia injection nozzles 21, 22, 23, 24 are formed by using a catalyst C which decomposes ammonia into hydrogen and nitrogen.

IPC Classes  ?

• F23K 5/00 - Feeding or distributing other fuel to combustion apparatus
• F23C 1/00 - Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in air
• F23C 13/08 - Apparatus in which combustion takes place in the presence of catalytic material characterised by the catalytic material
• F23K 5/08 - Preparation of fuel
• F23K 5/10 - Mixing with other fluids

Abstract

A vortex chamber includes an outer circumference wall, a container, an annular shoal portion provided between the container and the outer circumference wall so as to encircle the outer circumference of the container, and a dam portion protruding upward from the upper surface of the outer circumference of the container so as to partition the container from the shoal portion. An undried nonferrous metal block is fed into the shoal portion, the block having such a size that is not completely submerged into the molten metal in the shoal portion. The fed nonferrous metal block is gradually melted to have a reduced volume of small pieces and particles of nonferrous metal, which are re-circulated in the shoal portion, flown over the dam portion, and dropped into the container, thereby forming a vortex in the container in which remaining small pieces and particles submerged into the molten metal are melted.

IPC Classes  ?

• C22B 21/00 - Obtaining aluminium
• F27D 3/00 - ChargingDischargingManipulation of charge
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
• F27B 3/04 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-hearth typeHearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-chamber typeCombinations of hearth-type furnaces
• F27D 27/00 - Stirring devices for molten material
• F27D 3/14 - Charging or discharging liquid or molten material
• F27D 99/00 - Subject matter not provided for in other groups of this subclass

Abstract

A furnace includes: a furnace body; a housing rotary body including a plurality of side walls, a plurality of housing chambers partitioned by the side walls and disposed circumferentially in multiple stages, each including multiple housing chambers, and a space disposed in the central portion of the housing rotary body to provide a donut shape in plan view; a rotary driving device for rotating the housing rotary body; a heating device for heating the air inside the furnace body; a first and a second partition wall which together partition the inside of the furnace body into the first and the second zone; a first flow passage communicating a blowout port of the fan with outer circumference sides of the housing chambers in the first zone; and a second flow passage communicating outer circumference sides of the housing chambers in the second zone with a suction port of the fan.

IPC Classes  ?

• F27B 7/02 - Rotary-drum furnaces, i.e. horizontal or slightly inclined of multiple-chamber or multiple-drum type
• F27B 9/10 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and chargeFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity electrically heated heated by hot air or gas
• F27B 9/16 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatmentFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
• C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor
• F27D 99/00 - Subject matter not provided for in other groups of this subclass
• F27B 7/14 - Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
• F27B 7/20 - Details, accessories or equipment specially adapted for rotary-drum furnaces
• F27B 7/30 - Arrangements of partitions
• F27D 7/04 - Circulating atmospheres by mechanical means

Abstract

In order to reduce the height of a furnace body without decreasing the number of storage chambers in the height direction and also allow for a lower fan capacity while the rotary hearth has a simple structure, this rotary heat treatment furnace comprises: a furnace body (31); a storage rotating body (32) which has a substantially donut-like shape in plan view, is disposed straddling a first zone (P) and a second zone (Q), and is supported rotatably, said donut-like shape being formed from multiple storage chambers (32a) of substantially equivalent sizes that are formed in the circumferential direction and in multiple levels, with a gap (32a) being formed in the center, each storage chamber (32a) being partitioned by side walls (32c) extending in the radial direction; a rotary driving device (33) for rotating the storage rotating body (32); a first partitioning wall (37) and a second partitioning wall (38) that separates the interior of the furnace body (31) into the first zone (P) and the second zone (Q); a first channel (35) that connects the outer circumferential side of a storage chamber (32a) located in the first zone (P) to an air outlet of a fan (34); and a second channel (36) that connects the outer circumferential side of a storage chamber (32a) located in the second zone (Q) to an air inlet of the fan (34).

IPC Classes  ?

• F27B 9/10 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and chargeFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity electrically heated heated by hot air or gas
• C21D 1/34 - Methods of heating
• F27B 9/16 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatmentFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
• F27D 7/04 - Circulating atmospheres by mechanical means

Abstract

[Problem] To melt even a block-like non-ferrous metal material containing an oil and water safely and with high efficiency. [Solution] A voltex chamber (33) is composed of: an outer peripheral wall (331); an almost inverted cone-shaped vessel (332); a ring-shaped shallow part (333) which is provided between the vessel (332) and the outer peripheral wall (331) so as to surround the outer periphery of the vessel (332); and a weir part (334) which is provided so as to raise up against the outer periphery of the upper surface of the vessel (332) and partitions between the vessel (332) and the shallow part (333). An undried block-like non-ferrous metal material (M) having such a size that the non-ferrous metal material (M) cannot be completely immersed in the shallow part (333) in which a melt (10) is to circulate is gradually dissolved in the shallow part (333) in such a manner that the volume of the melt (10) is reduced, and small pieces and a powder of the size-reduced non-ferrous metal are allowed to run over the weir part (334) and fall into the vessel (332) while circulating the small pieces or the powder in the shallow part (333) together with the melt (10), thereby immersing and dissolving the non-ferrous metal material (M) by the action of a voltex flow.

IPC Classes  ?

• C22B 9/16 - Remelting metals
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
• C22B 21/00 - Obtaining aluminium
• F27B 3/04 - Hearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-hearth typeHearth-type furnaces, e.g. of reverberatory typeElectric arc furnaces of multiple-chamber typeCombinations of hearth-type furnaces
• F27D 27/00 - Stirring devices for molten material

Abstract

The present invention provides a method for controlling the carrying-in of metallic materials in a walking beam heat treatment furnace, by which heat treatment can be efficiently performed on metallic materials having various lengths in an anteroposterior direction. A control unit (18) calculates Xn+1 determined by Xn+1 = (Xn+mL)-{(an/2)+D+(an+1/2)} from the length (an) in the anteroposterior direction of an n-th metallic material (Wn), the distance (Xn) between a reference position (B) and the center position of the n-th metallic material (Wn), and the length (an+1) in the anteroposterior direction of an (n+1)-th metallic material (Wn+1) to be disposed next on a stationary beam (16), and when Xn+1 ≥ (an+1/2), disposes the (n+1)-th metallic material (Wn+1) at Xn+1 by means of a carrying-in device (14) while a moving beam (17) is stopped, and when Xn+1 < (an+1/2), operates the moving beam (17) m times until Xn+1 ≥ (an+1/2) is achieved.

IPC Classes  ?

• C21D 1/00 - General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
• C21D 11/00 - Process control or regulation for heat treatments
• F27B 9/24 - Furnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatmentFurnaces through which the charge is moved mechanically, e.g. of tunnel type Similar furnaces in which the charge moves by gravity characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path being carried by a conveyor
• F27B 9/38 - Arrangement of devices for charging
• F27B 9/40 - Arrangements of controlling or monitoring devices