Abstract:
A drier installation for continuous drying moving strip material comprises a first transverse convective drying system; and a second transverse convective drying system installed in downstream movement direction of the strip material from the first transverse convective drying system. The first transverse convective drying system comprises first suction nozzles for the suction of hot gas from at the moving strip material into a first suction duct; one or more than one first blowing nozzles for blowing at least part of the sucked hot gas from a first blowing duct back onto the moving strip material; and a first fan provided in gas flow connection between the first suction duct and the first blowing duct for sucking hot gas by the first suction nozzles and for blowing the hot gas by the one or more than one first blowing nozzles. The second transverse convective drying system comprises second suction nozzles for the suction of hot gas from at the moving strip material into a second suction duct; one or more than one second blowing nozzles for blowing at least part of the sucked hot gas from a second blowing duct back onto the moving strip material; and a second fan in gas flow connection between the second suction duct and the second blowing duct for sucking hot gas by the second suction nozzles and for blowing the hot gas by the one or more than one second blowing nozzles. At least one transverse row of gas fired radiation emitters is installed along the line of movement of the strip material between the first and the second transverse convective drying system. Ducting is provided connecting the second transverse convective drying system to the first transverse convective drying system to enable part of the hot gas to flow from the second suction duct to the first blowing duct in order to be blown by the first blowing nozzles onto the moving strip material.
Abstract:
The present invention relates to a gas fired infrared radiation emitter comprising a burner plate (140) acting as combustion surface and a radiant screen (160) positioned at the combustion side of the perforated tiles. The radiant screen is embossed (180) proving locally different distances between th burner plate and the radiant screen. The result is a higher performance of the gas fired infrared radiation emitter.
Abstract:
Gas fired radiant emitter(100)comprising a premixing chamber(110)for preparing a premix of gas and air; a perforated ceramic plate(120)acting as burner deck; and a pilot burner(130)comprising a premix gas supply flow tube (140)and two electrodes(160, 170). The premix gas supply flow tube (140) of the pilot burner(130) extends from the side of the perforated ceramic plate (120) where the premixing chamber(110)is located, into a through hole(180)in the perforated ceramic plate(120). The premix gas supply flow tube(140)has a gas exit in the through hole(180)in the perforated ceramic plate(120)or at the combustion side of the perforated ceramic plate(120). Means(192, 194)are provided so that in an area of the perforated ceramic plate(120)around where the premix gas supply flow tube extends(140)into athrough hole(180)in the perforated ceramic plate(120),no premix gas flows through the perforated ceramic plate(120).
Abstract:
A cooling system is described for the continuous cooling of sheet metal strip. The cooling system is installed downstream of a continuous oven which is drying a coating applied to the sheet metal. The cooling system is provided with means for blowing cooling air onto the sheet metal strip. The cooling system comprises -for at least part of the means for blowing cooling air onto the sheet metal strip - means for increasing the temperature of the cooling air prior to blowing the cooling air onto the sheet metal. A method is disclosed for using such cooling systems, e.g. for cooling coatings comprising magnesium oxide that are applied on grain-oriented electrical steel.
Abstract:
A gas fired radiant emitter comprises a burner deck onto which premix gas is combusted when the emitter is in use; and a metal plate provided at the combustion side of the burner deck. The metal plate is provided to act as radiant screen when the emitter is in use. The metal plate is at least over part of its surface spaced from the burner deck. The metal plate comprises a plurality of elongated slots for passage through the metal plate of flue gas generated on the burner deck. The plurality of elongated slots comprise a first elongated slot. The first elongated slot has a first tangent along a position along the length of the first elongated slot. The plurality of elongated slots comprise a second elongated slot. The second elongated slot has a second tangent along a position along the length of the second elongated slot. The angle between the first tangent and the second tangent is between 45° and 135°.
Abstract:
A nozzlebox for blowing hot gas in the convective drying zone of equipment for the continuous drying of air-borne paper sheets comprises at least one direct impingement nozzle for ejecting a jet of hot gas perpendicular to the average plane of the paper sheet to be dried. The nozzle box comprises a plurality of inclined jet nozzles for ejecting jets of hot gas under an inclined angle with respect to the average plane of the paper sheet to be dried. At least two inclined jet nozzles are provided for which the plane comprising the vector representations of the jet directions of the at least two inclined jet nozzles does not comprise the vector representing the jet direction of a direct impingement nozzle.
Abstract:
The invention relates to a method for manufacturinga gas fired radiant emitter with increased emissivity. The method comprises the steps of - providing a porous ceramic burner deck, e.g. a perforated ceramic burner deck, - applying a wet coating layer on the porous ceramic burner deck, wherein the wet coating layer comprises ceramic particles and/or metallic particles that will form a coating layer with increased emissivity compared to the porous ceramic burner deck without the coating layer, - sintering and/or curing the coating layer, whereby the sintering and/or curing is performed by operating the gas fired radiant emitter in which the porous ceramic burner deck is mounted, via supplying combustible gas to the radiant emitter and igniting the combustible gas after it has flown through the porous ceramic burner deck, whereby the uncured and/or unsintered coating layer is transformed into a sintered and/or cured coating layer adhering to the porous ceramic burner deck via sintered and/or cured bonds.
Abstract:
A ceramic reflector (100) for at least one IR lamp comprises at least one elongated concave reflector body (102). Each of the at least one elongated concave reflector bodies comprises an elongated bottom section and two elongated upstanding walls. Each of the elongated concave reflector bodies is provided for containing at least one IR lamp (150) and for reflecting the IR light from the at least one IR lamp. Each elongated concave reflector body has in each cross section at both of its upstanding walls a wall height. The wall height is the vertical distance between the deepest level of the bottom section of the reflector body and the highest level of the upstanding wall. At one or at both longitudinal ends of at least one reflector body; the wall height is at both upstanding walls larger than in the middle section of the elongated concave reflector body.
Abstract:
A convective hood for transverse installation in a system for continuous heat treatment of moving strip material comprises blowing nozzles for blowing hot gas against the moving strip in an arrangement transverse to the direction of movement of the strip material; and a first transverse suction zone for the suction of hot gas. The first transverse suction zone comprises a first transverse section and a second transverse section. The first transverse section and the second transverse section are provided at the same side downstream or upstream of the movement of the strip material from the blowing nozzles when the convective hood is installed in a system for continuous heat treatment of moving strip material. The second transverse section is provided along the line for movement of the continuous strip material between the first transverse section and the blowing nozzles. The first transverse section comprises suction openings for suction of hot gas directly from outside the convective hood into the convective hood; the suction openings being in closed gas flow connection to a first manifold for recirculation of at least part of this hot gas to the blowing nozzles for blowing the hot gas onto the continuous strip material. The second transverse section comprises suction openings for suction of hot gas directly from outside the convective hood into the convective hood; the suction openings being in closed gas flow connection to a second manifold for exhausting 100% of this hot gas outside of the convective hood.
Abstract:
A radiant burner (1) comprises a body (2) defining a premixing space (9) and a combustion space (10), the premixing space being separated from the combustion space by a radiant burner element (5) having its burner part (11) at the side of the combustion space, wherein the burner part's emissivity and/or conductivity and/or temperature resistance is not equal at each location of it while the gas permeability is substantially equal at each location of it. At least one location has a different value of emissivity and/or conductivity and/or temperature resistance than the radiant burner element base material.