EP0486741A1 - Gas heating apparatus by infrared radiation - Google Patents

Gas heating apparatus by infrared radiation Download PDF

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Publication number
EP0486741A1
EP0486741A1 EP90403285A EP90403285A EP0486741A1 EP 0486741 A1 EP0486741 A1 EP 0486741A1 EP 90403285 A EP90403285 A EP 90403285A EP 90403285 A EP90403285 A EP 90403285A EP 0486741 A1 EP0486741 A1 EP 0486741A1
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EP
European Patent Office
Prior art keywords
gas
housing
air
air inlet
inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90403285A
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German (de)
French (fr)
Inventor
Claude-Michel Céré
Dominique Boudrie
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Dite Triatherm Sarl Ste
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Dite Triatherm Sarl Ste
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Filing date
Publication date
Application filed by Dite Triatherm Sarl Ste filed Critical Dite Triatherm Sarl Ste
Publication of EP0486741A1 publication Critical patent/EP0486741A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/125—Radiant burners heating a wall surface to incandescence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/10—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head
    • F23D14/105—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head with injector axis parallel to the burner head axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/04—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate
    • F24C3/06—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate without any visible flame
    • F24C3/062—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate without any visible flame stoves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
    • F26B3/305—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements the infrared radiation being generated by combustion or combustion gases

Definitions

  • the invention relates to a gas heating device, by infrared thermal radiation, more particularly intended to be placed in a room at a certain height and so as to emit infrared radiation towards the ground.
  • Infrared gas heaters are known, more particularly intended for heating large premises, in particular industrial or public premises.
  • Such a device is designed to emit infrared radiation towards the ground. This radiation is obtained by heating a metal body to a sufficient temperature, of the order of 400 to 500 °.
  • the device is equipped with at least one gas burner connected to a horizontal tube. The burner flame is directed towards the inside of the tube and a circulation of a mixture of hot air and gas resulting from combustion is maintained in the tube by a fan-extractor, connected to one end of it. The circulation of hot gases in the tube causes it to heat up. Said tube then emits infrared radiation.
  • a reflector is placed above the tube to return the fraction of the radiation emitted upwards to the ground.
  • the configuration and dimensions of the tube as well as the number of burners connected to this tube generally depend on the characteristics of the room to be heated. In simple cases, however, an appliance comprising only one burner and a tube shaped like a hairpin, often placed under the same reflector, is often used. The burner is connected at one end of the tube and the fan-extractor at the other end. The length of the device can reach up to 6 meters, or 12 meters of tube. Such an apparatus is of simple construction and installation and its cost price is attractive. On the other hand, its operation leaves something to be desired, insofar as it is difficult to obtain a uniform temperature of the tube and consequently a homogeneous radiation throughout the heated space.
  • the invention proposes another type of device, of simpler construction and of very low cost price, in particular due to the fact that the heating mode chosen and the natural circulation of the dilution air allow to consider, in most cases, the removal of any fan-extractor. More specifically, the invention therefore relates to a gas radiant heating device, characterized in that it comprises an elongated housing provided with an air inlet, lower, and a gas outlet, upper, and containing at least one gas rail arranged in the elongated direction of the housing along a radiation plate constituting at least part of a bottom wall of said housing and in that a baffle is arranged in the latter between the inlet and the outlet, so as to organize a circulation of gas enveloping said ramp and drawing down its flames towards said plate.
  • the dilution air is circulated all around the flame, while the latter extends over the entire length of the gas burner and therefore of the radiation plate.
  • the air circulation enveloping the gas ramp is done by natural convection and so that the flame is lowered and distributed uniformly over the largest part of the radiation plate, horizontal or slightly inclined, to radiate with the maximum of efficiency down to the ground.
  • the drawdown of the flame towards the horizontal is accentuated by the natural convection of the heated air in the room itself, especially if the device is placed high enough above the ground, because the rate of rise of the air heated in a room, tends to increase at the top of it.
  • this device comprises two gas ramps and two radiation plates arranged side by side in the same housing, symmetrically on either side of the air inlet, the latter being elongated in the form of a slot.
  • a gas heater comprising a housing 11, relatively flat in height and elongated in a horizontal direction.
  • This housing is provided with an air inlet 12, lower and a gas outlet 13, upper.
  • the inlet 12 and the outlet 13 are arranged one above the other, in the central part of the housing. They each have the form of a slot extending in the elongated direction of the housing.
  • This housing houses at least a gas ramp 15 disposed in said elongated direction along a metal radiation plate 16, constituting a part of the lower wall of the housing.
  • the housing houses two such gas ramps (15a, 15b) mounted back to back on either side of the air inlet 12 and arranged, each, along d 'a corresponding radiation plate 16a, 16b.
  • These two plates form the bulk of the lower wall of the housing 11.
  • the latter also contains a baffle 20 arranged between the inlet and the outlet so as to organize a gas circulation enveloping the or each ramp, and reducing its flames towards the corresponding radiation plate.
  • the baffle 20 comprises a deflector 21, central, preferably curved (as shown) in the transverse direction relative to the air inlet 12 and placed above the latter.
  • the position of this deflector is preferably adjustable inside the housing, this adjustment being carried out once and for all when the device is started up.
  • the central deflector 21 also substantially covers the two gas railings, at a certain distance from them.
  • the deflector 21 is extended over its entire length, by two lateral deflectors 22a, 22b, substantially covering the radiation plates 16a, 16b, respectively, at a distance therefrom.
  • Each lateral deflector is made of thermally insulating material or at least its lower face, facing the flame is covered with such an insulating material.
  • the gas supply conduit 25, supplying the two ramps and the electrical supply conductors 26 driving the valves and the ignition device (for example of the piezoelectric type) are connected at one end from the housing 11.
  • the mixture of air and burnt gas is evacuated into the room itself, the outlet 13 not being covered.
  • an extractor hood 28 shown in broken lines, can be placed above the outlet 13 and connected to a mechanical extractor 30, electrically powered.
  • the two radiation plates 16a, 16b are not strictly arranged horizontally, they form an obtuse dihedral, almost flat, the top of which is occupied by the air inlet 12.
  • the side deflectors 22a, 22b are arranged substantially parallel to the radiation plates 16a, 16b, respectively.
  • each radiating plate near its longitudinal edge furthest from the inlet 12, is an air ducting rib 32a, 32b, respectively.
  • Each rib is inclined downward and forms a sharp dihedral with the neighboring radiation plate, as shown.
  • This dilution air is guided along the plates 16.
  • a flap 36 in the form of an obtuse dihedral is positioned in look at entrance 12, below and at a distance from it. The point of the dihedral is opposite the median plane of the entrance. It is fixed to the housing by means of bracing not shown.
  • the spacing of the shutter 36 relative to the air inlet is adjustable, when the device is put into service.
  • Such a ramp 15 comprises an injector 40, shaped as a Venturi, with a fuel gas inlet 41, axial, and a combustion air inlet 42, annular.
  • This injector opens into an elongated distribution chamber 45, extending substantially along the entire length of the housing.
  • the cross section of the distribution chamber 45 decreases as a function of the distance from the injector 40, thanks to a rear wall 45a placed at an angle, as can be seen in FIG. 3.
  • This feature allows the air-gas mixture to be distributed substantially at constant pressure all along the ramp. A flame of practically constant length is thus obtained at every point of the ramp.
  • the gas train 15 has a longitudinal slot 48 materialized between two parallel lips 49 extending laterally the distribution chamber 45.
  • This slot which constitutes the flame outlet of the gas train, therefore communicates over its entire length with the distribution chamber 45.
  • the flame output is therefore continuous, which contributes to creating a flame in the form of a flat strip.
  • the spacing of the two lips 49 is adjustable, depending on the conditions on site and the calorific value of the fuel used. This adjustment is carried out here by inserting spacers 50, of selected height, between the lips 49. Such spacers are placed at regular intervals along the slot.
  • the dilution air which enters through the inlet 12 is divided into two opposite streams respectively bypassing the gas ramps 15a, 15b and drawing down the flames in a position close to the horizontal, capable of ensuring optimum heating. and uniform of the corresponding plates 16a, 16b. Then the mixture of air and burnt gas circulates beyond the flames in the baffle 20 before being rejected by the outlet 13.
  • the position of the central deflector 21 makes it possible in particular to adjust the orientation of the flames relative to the horizontal, within the limits of approximately 10 ° and therefore to adjust, to a certain extent, the temperature of the radiation plates 16.
  • the adjustment of the distance between the flap 36 and the inlet 12 makes it possible to dose the quantity of dilution air participating in the cooling of the combustion products. This also contributes to controlling the temperature of the radiation plates.
  • the device which has just been described is suitable for heating premises of relatively great height, it can also be used for drying products exposed to its radiation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)

Abstract

Apparatus for gas heating by infrared radiation brought about by the heating of a radiation plate. According to the invention, the apparatus comprises a casing (11) enclosing at least one elongate pipe burner (15a), an air inlet (12) and a gas outlet (13), a chicane (20) being formed inside the casing to channel the dilution air and allow this air circulation to turn the flame down towards a metal radiation plate (16a) which is thus heated uniformly and brought to an adequate temperature to emit infrared radiation towards the bottom. Application to heating rooms or drying products. <IMAGE>

Description

L'invention se rapporte à un appareil de chauffage au gaz, par rayonnement thermique infrarouge, plus particulièrement destiné à être placé dans un local à une certaine hauteur et de façon à émettre un rayonnement infrarouge en direction du sol.The invention relates to a gas heating device, by infrared thermal radiation, more particularly intended to be placed in a room at a certain height and so as to emit infrared radiation towards the ground.

On connaît des appareils de chauffage au gaz par rayonnement infrarouge, plus particulièrement destinés au chauffage de locaux importants, notamment des locaux industriels ou publics. Un tel appareil est conçu pour émettre un rayonnement infrarouge vers le sol. Ce rayonnement est obtenu en chauffant un corps métallique à une température suffisante, de l'ordre de 400 à 500°. Selon un agencement classique, l'appareil est équipé d'au moins un brûleur à gaz connecté à un tube horizontal. La flamme du brûleur est dirigée vers l'intérieur du tube et une circulation d'un mélange d'air chaud et de gaz résultant de la combustion est entretenue dans le tube par un ventilateur-extracteur, connecté à une extrémité de celui-ci. La circulation des gaz chauds dans le tube provoque son échauffement. Ledit tube émet alors un rayonnement infrarouge. Un réflecteur est placé au-dessus du tube pour renvoyer vers le sol la fraction du rayonnement émise vers le haut. La configuration et les dimensions du tube ainsi que le nombre de brûleurs connectés à ce tube dépendent généralement des caractéristiques du local à chauffer. Pour des cas simples, cependant, on fait souvent appel à un appareil ne comportant qu'un seul brûleur et un tube conformé en épingle à cheveux, placé sous un même réflecteur. Le brûleur est connecté à une extrémité du tube et le ventilateur-extracteur à l'autre extrémité. La longueur de l'appareil peut atteindre jusqu'à 6 mètres, soit 12 mètres de tube. Un tel appareil est de construction et d'installation simples et son prix de revient est intéressant. En revanche, son fonctionnement laisse à désirer, dans la mesure où il est difficile d'obtenir une température uniforme du tube et par conséquent un rayonnement homogène dans tout l'espace chauffé.Infrared gas heaters are known, more particularly intended for heating large premises, in particular industrial or public premises. Such a device is designed to emit infrared radiation towards the ground. This radiation is obtained by heating a metal body to a sufficient temperature, of the order of 400 to 500 °. According to a conventional arrangement, the device is equipped with at least one gas burner connected to a horizontal tube. The burner flame is directed towards the inside of the tube and a circulation of a mixture of hot air and gas resulting from combustion is maintained in the tube by a fan-extractor, connected to one end of it. The circulation of hot gases in the tube causes it to heat up. Said tube then emits infrared radiation. A reflector is placed above the tube to return the fraction of the radiation emitted upwards to the ground. The configuration and dimensions of the tube as well as the number of burners connected to this tube generally depend on the characteristics of the room to be heated. In simple cases, however, an appliance comprising only one burner and a tube shaped like a hairpin, often placed under the same reflector, is often used. The burner is connected at one end of the tube and the fan-extractor at the other end. The length of the device can reach up to 6 meters, or 12 meters of tube. Such an apparatus is of simple construction and installation and its cost price is attractive. On the other hand, its operation leaves something to be desired, insofar as it is difficult to obtain a uniform temperature of the tube and consequently a homogeneous radiation throughout the heated space.

L'invention propose un autre type d'appareil, de construction plus simple et de prix de revient très bas, notamment en raison du fait que le mode de chauffage choisi et la circulation naturelle de l'air de dilution permettent d'envisager, dans la majorité des cas, la suppression de tout ventilateur-extracteur.
Plus précisément, l'invention concerne donc un appareil de chauffage à gaz par rayonnement, caractérisé en ce qu'il comprend un boîtier allongé muni d'une entrée d'air, inférieure, et d'une sortie de gaz, supérieure, et renfermant au moins une rampe à gaz disposée suivant la direction allongée du boîtier le long d'une plaque de rayonnement constituant au moins une partie d'une paroi inférieure dudit boîtier et en ce qu'une chicane est agencée dans ce dernier entre l'entrée et la sortie, de façon à organiser une circulation de gaz enveloppant ladite rampe et rabattant ses flammes vers ladite plaque.The invention proposes another type of device, of simpler construction and of very low cost price, in particular due to the fact that the heating mode chosen and the natural circulation of the dilution air allow to consider, in most cases, the removal of any fan-extractor.
More specifically, the invention therefore relates to a gas radiant heating device, characterized in that it comprises an elongated housing provided with an air inlet, lower, and a gas outlet, upper, and containing at least one gas rail arranged in the elongated direction of the housing along a radiation plate constituting at least part of a bottom wall of said housing and in that a baffle is arranged in the latter between the inlet and the outlet, so as to organize a circulation of gas enveloping said ramp and drawing down its flames towards said plate.

Ainsi, l'air de dilution est mis en circulation tout autour de la flamme, tandis que cette dernière s'étend sur toute la longueur du brûleur à gaz et donc de la plaque de rayonnement. La circulation d'air enveloppant la rampe à gaz se fait par convexion naturelle et de telle sorte que la flamme soit rabattue et répartie uniformément sur la plus grande partie de la plaque de rayonnement, horizontale ou faiblement inclinée, pour rayonner avec le maximum d'efficacité vers le sol. Le rabattement de la flamme vers l'horizontale est accentué par la convexion naturelle de l'air chauffé dans le local lui-même, spécialement si l'appareil est placé assez haut au-dessus du sol, car la vitesse ascensionnelle de l'air chauffé dans un local, a tendance à augmenter dans la partie supérieure de celui-ci. Cette "énergie propre" de l'air qui pénètre dans le boîtier est donc exploitée et contribue efficacement à rabattre la flamme contre la plaque de rayonnement, ce qui améliore le rendement de l'appareil. De préférence, cet appareil comporte deux rampes à gaz et deux plaques de rayonnement agencées côte à côte dans un même boîtier, symétriquement de part et d'autre de l'entrée d'air, cette dernière étant allongée en forme de fente.Thus, the dilution air is circulated all around the flame, while the latter extends over the entire length of the gas burner and therefore of the radiation plate. The air circulation enveloping the gas ramp is done by natural convection and so that the flame is lowered and distributed uniformly over the largest part of the radiation plate, horizontal or slightly inclined, to radiate with the maximum of efficiency down to the ground. The drawdown of the flame towards the horizontal is accentuated by the natural convection of the heated air in the room itself, especially if the device is placed high enough above the ground, because the rate of rise of the air heated in a room, tends to increase at the top of it. This "clean energy" of the air which penetrates into the housing is therefore exploited and contributes effectively to reduce the flame against the radiation plate, which improves the efficiency of the device. Preferably, this device comprises two gas ramps and two radiation plates arranged side by side in the same housing, symmetrically on either side of the air inlet, the latter being elongated in the form of a slot.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre d'un appareil de chauffage à gaz conforme à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés, dans lesquels

  • la figure 1 est une vue de dessus, en perspective, de l'appareil de chauffage conforme à l'invention;
  • la figure 2 est une vue en coupe transversale de ce même appareil, représentée à plus grande échelle;
  • la figure 3 est une vue en coupe longitudinale d'une rampe à gaz de l'appareil; et
  • la figure 4 est une vue en coupe transversale de ladite rampe.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of a gas heating appliance conforming to its principle, given solely by way of example and made in reference to the accompanying drawings, in which
  • Figure 1 is a top view, in perspective, of the heating device according to the invention;
  • Figure 2 is a cross-sectional view of the same device, shown on a larger scale;
  • Figure 3 is a longitudinal sectional view of a gas train of the apparatus; and
  • Figure 4 is a cross-sectional view of said ramp.

En se reportant aux dessins, on a représenté un appareil de chauffage à gaz comprenant un boitier 11, relativement plat en hauteur et allongé suivant une direction horizontale. Ce boîtier est pourvu d'une entrée d'air 12, inférieure et d'une sortie de gaz 13, supérieure. L'entrée 12 et la sortie 13 sont ménagées l'une au-dessus de l'autre, dans la partie centrale du boîtier. Elles ont chacune la forme d'une fente s'étendant suivant la direction allongée du boîtier. Ce boîtier abrite au moins rampe à gaz 15 disposée suivant ladite direction allongée le long d'une plaque de rayonnement 16, métallique, constituant une partie de la paroi inférieure du boîtier. De préférence, et conformément à ce qui est représenté, le boîtier abrite deux telles rampes à gaz (15a, 15b) montées dos à dos de part et d'autre de l'entrée d'air 12 et disposées, chacune, le long d'une plaque de rayonnement 16a, 16b, correspondante. Ces deux plaques forment l'essentiel de la paroi inférieure du boîtier 11. Ce dernier renferme en outre une chicane 20 agencée entre l'entrée et la sortie de façon à organiser une circulation de gaz enveloppant la ou chaque rampe, et rabattant ses flammes vers la plaque de rayonnement correspondante. Dans l'exemple décrit, la chicane 20 comprend un déflecteur 21, central, de préférence courbe (comme représenté) dans le sens transversal par rapport à l'entrée d'air 12 et placé au-dessus de celle-ci. La position de ce déflecteur est de préférence réglable à l'intérieur du boitier, ce réglage étant effectué une fois pour toute à la mise en route de l'appareil. Le déflecteur central 21 recouvre aussi sensiblement les deux rampes à gaz, à une certaine distance de celles-ci. Le déflecteur 21 est prolongé sur toute sa longueur, par deux déflecteurs latéraux 22a, 22b, recouvrant sensiblement les plaques de rayonnement 16a, 16b, respectivement, à distance de celles-ci. Chaque déflecteur latéral est en matériau thermiquement isolant ou au moins sa face inférieure, en regard de la flamme est recouverte d'un tel matériau isolant. Comme le montre la figure 1 , le conduit d'alimentation en gaz 25, alimentant les deux rampes et les conducteurs d'alimentation électrique 26 pilotant les vannes et le dispositif d'allumage (par exemple du type piezo électrique) sont raccordés à une extrémité du boîtier 11. Normalement, le mélange d'air et de gaz brûlé est évacué dans le local même, la sortie 13 n'étant pas recouverte. Cependant, pour satisfaire certaines normes applicables à certains locaux et/ou pour éviter une condensation de vapeur d'eau trop importante dans le local, il peut être nécessaire d'évacuer ces gaz à l'extérieur du local. Dans ce cas, une hotte aspirante 28, représentée en trait interrompu, peut être placée au-dessus de la sortie 13 et raccordée à un extracteur mécanique 30, alimenté électriquement. A la partie inférieure du boîtier, les deux plaques de rayonnement 16a, 16b, ne sont pas disposées rigoureusement horizontalement, elles forment un dièdre obtus, presque plat, dont le sommet est occupé par l'entrée d'air 12. A l'intérieur, les déflecteurs latéraux 22a, 22b, sont disposés sensiblement parallèlement aux plaques de rayonnement 16a, 16b, respectivement. En bordure de chaque plaque de rayonnement, près de son bord longitudinal le plus éloigné de l'entrée 12, se trouve une nervure de canalisation d'air 32a, 32b, respectivement. Chaque nervure est inclinée vers le bas et forme un dièdre aigu avec la plaque de rayonnement voisine, comme cela est représenté. Le rôle de ces nervures et d'améliorer le mouvement convectif de l'air vers l'entrée 12. Cet air de dilution est guidé le long des plaques 16. Dans le même but, un volet 36 en forme de dièdre obtus est positionné en regard de l'entrée 12, en-dessous et à distance de celle-ci. La pointe du dièdre est en regard du plan médian de l'entrée. Il est fixé au boîtier par des moyens d'entretoisement non représentés. L'écartement du volet 36 par rapport à l'entrée d'air est réglable, à la mise en service de l'appareil.Referring to the drawings, there is shown a gas heater comprising a housing 11, relatively flat in height and elongated in a horizontal direction. This housing is provided with an air inlet 12, lower and a gas outlet 13, upper. The inlet 12 and the outlet 13 are arranged one above the other, in the central part of the housing. They each have the form of a slot extending in the elongated direction of the housing. This housing houses at least a gas ramp 15 disposed in said elongated direction along a metal radiation plate 16, constituting a part of the lower wall of the housing. Preferably, and in accordance with what is shown, the housing houses two such gas ramps (15a, 15b) mounted back to back on either side of the air inlet 12 and arranged, each, along d 'a corresponding radiation plate 16a, 16b. These two plates form the bulk of the lower wall of the housing 11. The latter also contains a baffle 20 arranged between the inlet and the outlet so as to organize a gas circulation enveloping the or each ramp, and reducing its flames towards the corresponding radiation plate. In the example described, the baffle 20 comprises a deflector 21, central, preferably curved (as shown) in the transverse direction relative to the air inlet 12 and placed above the latter. The position of this deflector is preferably adjustable inside the housing, this adjustment being carried out once and for all when the device is started up. The central deflector 21 also substantially covers the two gas railings, at a certain distance from them. The deflector 21 is extended over its entire length, by two lateral deflectors 22a, 22b, substantially covering the radiation plates 16a, 16b, respectively, at a distance therefrom. Each lateral deflector is made of thermally insulating material or at least its lower face, facing the flame is covered with such an insulating material. As shown in Figure 1, the gas supply conduit 25, supplying the two ramps and the electrical supply conductors 26 driving the valves and the ignition device (for example of the piezoelectric type) are connected at one end from the housing 11. Normally, the mixture of air and burnt gas is evacuated into the room itself, the outlet 13 not being covered. However, to meet certain standards applicable to certain premises and / or to avoid excessive condensation of water vapor in the room, it may be necessary to evacuate these gases outside the room. In this case, an extractor hood 28, shown in broken lines, can be placed above the outlet 13 and connected to a mechanical extractor 30, electrically powered. At the lower part of the housing, the two radiation plates 16a, 16b, are not strictly arranged horizontally, they form an obtuse dihedral, almost flat, the top of which is occupied by the air inlet 12. Inside , the side deflectors 22a, 22b, are arranged substantially parallel to the radiation plates 16a, 16b, respectively. At the edge of each radiating plate, near its longitudinal edge furthest from the inlet 12, is an air ducting rib 32a, 32b, respectively. Each rib is inclined downward and forms a sharp dihedral with the neighboring radiation plate, as shown. The role of these ribs and of improving the convective movement of the air towards the inlet 12. This dilution air is guided along the plates 16. For the same purpose, a flap 36 in the form of an obtuse dihedral is positioned in look at entrance 12, below and at a distance from it. The point of the dihedral is opposite the median plane of the entrance. It is fixed to the housing by means of bracing not shown. The spacing of the shutter 36 relative to the air inlet is adjustable, when the device is put into service.

On va maintenant décrire la structure particulière de l'une des rampes à gaz, 15a ou 15b.We will now describe the particular structure of one of the gas ramps, 15a or 15b.

Une telle rampe 15 comporte un injecteur 40, conformé en Venturi, avec une entrée de gaz combustible 41, axiale, et une entrée d'air comburant 42, annulaire. Cet injecteur débouche dans une chambre de répartition 45 allongée, s'étendant sensiblement suivant toute la longueur du boîtier. La section transversale de la chambre de répartition 45 décroît en fonction de la distance à l'injecteur 40, grâce à une paroi arrière 45a placée en biais, comme cela est visible sur la figure 3. Cette particularité permet une distribution du mélange air-gaz sensiblement à pression constante tout le long de la rampe. On obtient ainsi une flamme de longueur pratiquement constante en tout point de la rampe. Comme le montrent les figures 3 et 4, la rampe à gaz 15 comporte une fente longitudinale 48 matérialisée entre deux lèvres parallèles 49 prolongeant latéralement la chambre de répartition 45. Cette fente, qui constitue la sortie de flamme de la rampe à gaz, communique donc sur toute sa longueur avec la chambre de répartition 45. La sortie de flamme est donc continue, ce qui contribue à créer une flamme en forme de bande plate. L'écartement des deux lèvres 49 est réglable, en fonction des conditions sur site et du pouvoir calorifique du combustible utilisé. Ce réglage est ici réalisé en insérant des entretoises 50, de hauteur choisie, entre les lèvres 49. De telles entretoises sont placées à intervalles réguliers le long de la fente.Such a ramp 15 comprises an injector 40, shaped as a Venturi, with a fuel gas inlet 41, axial, and a combustion air inlet 42, annular. This injector opens into an elongated distribution chamber 45, extending substantially along the entire length of the housing. The cross section of the distribution chamber 45 decreases as a function of the distance from the injector 40, thanks to a rear wall 45a placed at an angle, as can be seen in FIG. 3. This feature allows the air-gas mixture to be distributed substantially at constant pressure all along the ramp. A flame of practically constant length is thus obtained at every point of the ramp. As shown in FIGS. 3 and 4, the gas train 15 has a longitudinal slot 48 materialized between two parallel lips 49 extending laterally the distribution chamber 45. This slot, which constitutes the flame outlet of the gas train, therefore communicates over its entire length with the distribution chamber 45. The flame output is therefore continuous, which contributes to creating a flame in the form of a flat strip. The spacing of the two lips 49 is adjustable, depending on the conditions on site and the calorific value of the fuel used. This adjustment is carried out here by inserting spacers 50, of selected height, between the lips 49. Such spacers are placed at regular intervals along the slot.

En fonctionnement, l'air de dilution qui pénètre par l'entrée 12, se partage en deux flux opposés contournant respectivement les rampes à gaz 15a, 15b et rabattant les flammes dans une position proche de l'horizontale, propre à assurer un chauffage optimum et uniforme des plaques 16a, 16b, correspondantes. Puis le mélange d'air et de gaz brûlé circule au-delà des flammes dans la chicane 20 avant d'être rejeté par la sortie 13. La position du déflecteur central 21 permet notamment de régler l'orientation des flammes par rapport à l'horizontale, dans les limites de 10° environ et donc d'ajuster, dans une certaine mesure, la température des plaques de rayonnement 16. Dans le même esprit, le réglage de la distance entre le volet 36 et l'entrée 12 permet de doser la quantité d'air de dilution participant au refroidissement des produits de combustion. Ceci contribue aussi à maîtriser la température des plaques de rayonnement.In operation, the dilution air which enters through the inlet 12 is divided into two opposite streams respectively bypassing the gas ramps 15a, 15b and drawing down the flames in a position close to the horizontal, capable of ensuring optimum heating. and uniform of the corresponding plates 16a, 16b. Then the mixture of air and burnt gas circulates beyond the flames in the baffle 20 before being rejected by the outlet 13. The position of the central deflector 21 makes it possible in particular to adjust the orientation of the flames relative to the horizontal, within the limits of approximately 10 ° and therefore to adjust, to a certain extent, the temperature of the radiation plates 16. In the same spirit, the adjustment of the distance between the flap 36 and the inlet 12 makes it possible to dose the quantity of dilution air participating in the cooling of the combustion products. This also contributes to controlling the temperature of the radiation plates.

A la mise en route, l'échauffement progressif des plaques de rayonnement accentue le mouvement convectif de l'air situé sous lesdites plaques. Cet air pénètre par l'entrée 12. L'action de l'air tendant à rabattre les flammes est accentuée au fur et à mesure de la montée en température de l'appareil, jusqu'à ce qu'un équilibre s'établisse.On start-up, the gradual heating of the radiation plates accentuates the convective movement of the air located under said plates. This air enters through the inlet 12. The action of the air tending to reduce the flames is accentuated as the temperature rises in the apparatus, until a balance is established.

L'appareil qui vient d'être décrit convient pour le chauffage de locaux de relativement grande hauteur, il peut aussi être utilisé pour le séchage de produits exposés à son rayonnement.The device which has just been described is suitable for heating premises of relatively great height, it can also be used for drying products exposed to its radiation.

Claims (11)

Appareil de chauffage à gaz par rayonnement, caractérisé en ce qu'il comprend un boîtier (11) allongé, muni d'une entrée d'air (12), inférieure, et d'une sortie de gaz (13), supérieure, et renfermant au moins une rampe à gaz (15) disposée suivant la direction allongée du boîtier le long d'une plaque de rayonnement (16) constituant au moins une partie d'une paroi inférieure dudit boîtier et en ce qu'une chicane (20) est agencée dans ce dernier entre l'entrée et la sortie, de façon à organiser une circulation de gaz enveloppant ladite rampe et rabattant ses flammes vers ladite plaque.Gas radiant heater, characterized in that it comprises an elongated housing (11), provided with an air inlet (12), lower, and a gas outlet (13), upper, and containing at least one gas rail (15) arranged in the elongated direction of the housing along a radiation plate (16) constituting at least part of a lower wall of said housing and in that a baffle (20) is arranged in the latter between the inlet and the outlet, so as to organize a gas circulation enveloping said ramp and drawing down its flames towards said plate. Appareil de chauffage selon la revendication 1, caractérisé en ce qu'une rampe à gaz précitée comporte un injecteur (40) débouchant dans une chambre de répartition (45) allongée, dont la section transversale décroît en fonction de la distance à l'injecteur.Heating device according to claim 1, characterized in that a said gas rail comprises an injector (40) opening into an elongated distribution chamber (45), the cross section of which decreases as a function of the distance from the injector. Appareil selon la revendication 2, caractérisé en ce que ledit injecteur (40) est conformé en Venturi.Apparatus according to claim 2, characterized in that said injector (40) is shaped like a Venturi. Appareil selon la revendication 2 ou 3, caractérisé en ce que ladite rampe à gaz (15) comporte une fente longidutinale (48) communiquant, sur toute se longueur, avec la chambre de répartition (45) et constituant une sortie de flamme continue.Apparatus according to claim 2 or 3, characterized in that said gas rail (15) has a longitudinal slot (48) communicating, over any length, with the distribution chamber (45) and constituting a continuous flame outlet. Appareil selon la revendication 4, caractérisé en ce que ladite fente (48) est définie entre deux lèvres parallèles (49) prolongeant latéralement ladite chambre de répartition et en ce que l'écartement de ces deux lèvres est réglable, par exemple grâce à des entretoises (50) de hauteur choisie, insérées entre lesdites lèvres, notamment pour l'adaptation de ladite rampe à gaz au pouvoir calorifique du gaz effectivement utilisé.Apparatus according to claim 4, characterized in that said slot (48) is defined between two parallel lips (49) extending laterally said distribution chamber and in that the spacing of these two lips is adjustable, for example by means of spacers (50) of selected height, inserted between said lips, in particular for adapting said gas rail to the calorific value of the gas actually used. Appareil selon l'une des revendications précédentes, caractérisé en ce qu'il comprend deux rampes à gaz (15a, 15b), précitées, montées dos à dos de part et d'autre de ladite entrée d'air (12), cette dernière étant en forme de fente ménagée au milieu de la face inférieure du boîtier et en ce que la paroi inférieure de ce boîtier comprend essentiellement deux plaques de rayonnement (16a, 16b) précitées correspondant respectivement aux deux rampes.Apparatus according to one of the preceding claims, characterized in that it comprises two gas ramps (15a, 15b), mentioned above, mounted back to back on either side of said air inlet (12), the latter being in the form of a slot formed in the middle of the lower face of the housing and in that the lower wall of this housing essentially comprises two aforementioned radiation plates (16a, 16b) corresponding respectively to the two ramps. Appareil selon la revendication 6, caractérisé en ce que la chicane (20) précitée comprend un déflecteur central (21), de préférence courbe dans le sens transversal à l'entrée d'air (12) et placé au-dessus de celle-ci, ce déflecteur central recouvrant sensiblement les deux rampes à gaz à distance de celles-ci.Apparatus according to claim 6, characterized in that the above-mentioned baffle (20) comprises a central deflector (21), preferably curved in the transverse direction to the air inlet (12) and placed above the latter , this central deflector substantially covering the two ramps to gas away from them. Appareil selon la revendication 7, caractérisé en ce que ledit déflecteur central (21) est prolongé par deux déflecteurs latéraux (22a, 22b), recouvrant sensiblement lesdites plaques, respectivement, à distance de celles-ci.Apparatus according to claim 7, characterized in that said central deflector (21) is extended by two lateral deflectors (22a, 22b), substantially covering said plates, respectively, at a distance therefrom. Appareil selon la revendication 8, caractérisé en ce qu'au moins la face inférieure d'un tel déflecteur latéral (22) est en matériau thermiquement isolant.Apparatus according to claim 8, characterized in that at least the underside of such a lateral deflector (22) is made of thermally insulating material. Appareil selon l'une des revendications précédentes, caractérisé en ce qu'une nervure de canalisation d'air (32a, 32b) est agencée en bordure de la ou chaque plaque de rayonnement, près de son bord longitudinal le plus éloigné de ladite entrée d'air.Apparatus according to one of the preceding claims, characterized in that an air ducting rib (32a, 32b) is arranged at the edge of the or each radiation plate, near its longitudinal edge furthest from said inlet d 'air. Appareil selon l'une des revendications 6 à 10, caractérisé en ce qu'un volet (36) est positionné en regard de ladite entrée d'air (12), en dessous et à distance choisie de celle-ci.Apparatus according to one of claims 6 to 10, characterized in that a flap (36) is positioned opposite said air inlet (12), below and at a selected distance therefrom.
EP90403285A 1989-11-17 1990-11-21 Gas heating apparatus by infrared radiation Withdrawn EP0486741A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8915089A FR2654806B1 (en) 1989-11-17 1989-11-17 INFRARED RADIATION GAS HEATER.

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EP0486741A1 true EP0486741A1 (en) 1992-05-27

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0643261A1 (en) * 1993-09-13 1995-03-15 Gastec N.V. Compact gas-fired infrared radiator of closed design
EP0769658A1 (en) * 1995-10-21 1997-04-23 Herbert Baumanns Gas radiant heater
CN103748416A (en) * 2011-07-27 2014-04-23 株式会社Ihi Combustion heater

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2680225A1 (en) * 1991-08-08 1993-02-12 Fadime Sarl Gas-fired devices for radiant heating
DE19631475A1 (en) * 1996-08-03 1998-02-05 Stefan Kemna Radiant heat heating

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK5538C (en) * 1903-03-23 Leonhard Bauer Oven with Gas heating for Iron and the like.
FR678827A (en) * 1929-07-22 1930-04-04 Improvements to gas heaters
CH329290A (en) * 1954-12-09 1958-04-30 Roemer Raoul Gas heater
AU559110B3 (en) * 1986-06-11 1987-03-12 G.L.G. Australia Pty. Limited Improvements relating to gas burners

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK5538C (en) * 1903-03-23 Leonhard Bauer Oven with Gas heating for Iron and the like.
FR678827A (en) * 1929-07-22 1930-04-04 Improvements to gas heaters
CH329290A (en) * 1954-12-09 1958-04-30 Roemer Raoul Gas heater
AU559110B3 (en) * 1986-06-11 1987-03-12 G.L.G. Australia Pty. Limited Improvements relating to gas burners

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0643261A1 (en) * 1993-09-13 1995-03-15 Gastec N.V. Compact gas-fired infrared radiator of closed design
NL9301581A (en) * 1993-09-13 1995-04-03 Gastec Nv Compact gas-fired infrared radiator in closed design.
US5483948A (en) * 1993-09-13 1996-01-16 Gastec N.V. Compact gas-fired infrared radiator of closed design
EP0769658A1 (en) * 1995-10-21 1997-04-23 Herbert Baumanns Gas radiant heater
CN103748416A (en) * 2011-07-27 2014-04-23 株式会社Ihi Combustion heater
EP2738462A1 (en) * 2011-07-27 2014-06-04 IHI Corporation Combustion heater
EP2738462A4 (en) * 2011-07-27 2015-01-07 Ihi Corp Combustion heater
US9416964B2 (en) 2011-07-27 2016-08-16 Ihi Corporation Combustion heater
CN103748416B (en) * 2011-07-27 2018-11-02 株式会社 Ihi Burning heater

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Publication number Publication date
FR2654806B1 (en) 1992-02-14
FR2654806A1 (en) 1991-05-24

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