EP0737838A1 - Gas burner feeding device - Google Patents

Gas burner feeding device Download PDF

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Publication number
EP0737838A1
EP0737838A1 EP96400752A EP96400752A EP0737838A1 EP 0737838 A1 EP0737838 A1 EP 0737838A1 EP 96400752 A EP96400752 A EP 96400752A EP 96400752 A EP96400752 A EP 96400752A EP 0737838 A1 EP0737838 A1 EP 0737838A1
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EP
European Patent Office
Prior art keywords
gas
enrichment
main
combustible
mixing chamber
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.)
Granted
Application number
EP96400752A
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German (de)
French (fr)
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EP0737838B1 (en
Inventor
Jean-Claude Molla
Yves Claveille
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Engie SA
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Gaz de France SA
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Publication of EP0737838A1 publication Critical patent/EP0737838A1/en
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    • 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
    • F23D14/62—Mixing devices; Mixing tubes
    • 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
    • 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
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D23/00—Assemblies of two or more burners

Definitions

  • the invention relates to a supply device for gas burners and aims more particularly to ensure good ignition, that is to say instantaneous, safe and reliable of these burners while retaining optimal operation outside the ignition period.
  • the combustible gas coming from the main pipe and the combustible gas coming from the enrichment pipe are conveyed by two separate paths (pipes) to the burner.
  • this burner operates continuously in an enriched mixture (outside the ignition period). This burner therefore does not respond to the problem of the invention (which is incidentally indifferent to any visual effect), since normal operation is degraded (combustion mixture too rich), which results in excessive consumption of combustible gas and by producing soot and certainly other unwanted products.
  • the present invention therefore more particularly aims to improve the supply of gas burners, in particular radiant burners with ceramic plates, or even torch burners, in order to ensure rapid and reliable ignition of the mixture. gaseous, as well as good operating performance outside the ignition period, this under economically satisfactory conditions.
  • the supply device proposed to solve this problem is characterized, compared to the aforementioned basic structure of EP-B-0 157 375 considered as closest prior art, in that the enrichment conduit of the combustible gas mixture is connected in bypass to the fuel gas supply pipe and that it is connected downstream to said mixing chamber.
  • the "ignition period” is defined in the invention as the period, corresponding at least to the spark or flame time for an igniter device, prior to the stable nominal combustion regime.
  • Another problem solved by the invention consists in being able, on the one hand, to cut off the general supply of gas and, on the other hand, to easily obtain a richness of the gaseous mixture which is adapted to the ignition conditions while adjusting the richness under the condition of normal operation for optimum performance.
  • the solution of the invention consists of a control means allowing the simultaneous arrival of gas in the main conduits and enrichment with combustible gas, and also to regulate the pressure.
  • the advantage of this solution is to obtain good flame stability and an excellent yield by enriching in each phase, ignition or normal operation, neither too much nor too little, regardless of the combustible gas used (manufactured gases, petroleum gas, natural gases, ...), and also to be able to easily control the general gas supply.
  • the general solution of the invention also makes it possible to supply several burners from a single supply device.
  • the main and enrichment conduits are each divided into several branches upstream of the mixing chamber, which comprises a multiple box comprising at least two bent channels joined together upstream by a transverse section to which the means for supplying oxidant gas, each channel connecting downstream to a burner and each branch of said main fuel and enrichment gas conduits connecting to the mixing chamber substantially in the general plane of the corresponding channel.
  • the main combustible and enrichment gas conduits advantageously connect for this to the mixing chamber substantially perpendicular to one another and close to each other and the gas oxidizer opens, at a location, in a mixing chamber in the immediate vicinity of the location of the connection of said main fuel and enrichment gas conduits and substantially perpendicular to each of these conduits.
  • a means of mixing oxidizing gas and combustible gas here a mixing chamber 16, is supplied with oxidizing gas by a fan 10, and with combustible gas by a main duct 8 and an enrichment duct 6.
  • This mixing chamber feeds a gas mixture to at least one burner.
  • the device feeds two burners 14a, 14b.
  • the mixing chamber 16 comprises a multiple box comprising two bent channels (a and b).
  • the main and fuel gas enrichment conduits are divided into two branches before the gas is introduced into the mixing means. For each of the branches, the two conduits open substantially perpendicularly to each other and close to one another, in the general plane of the corresponding channel, in the mixing chamber (towards the upstream end 18 of the channels a and b ) while being each arranged substantially perpendicularly and in the immediate vicinity of the combustion air inlet.
  • the combustion air, blown by the fan 10 is divided in the central section 17 into two flows circulating towards each of the channels of the mixing chamber.
  • the aim of these perpendicular arrivals is to achieve an optimal mixture of combustible and oxidizing gases by creating, from the upstream part of the chamber, a turbulent flow regime for these gases supplemented in this by the bent shape of the mixing chamber.
  • a valve 4 placed on the enrichment pipe 6 makes it possible to interrupt the flow of combustible gas circulating in this pipe, while a control means 2 allows or prevents the arrival of combustible gas in the main pipes 8 and d enrichment 6 in combustible gas.
  • this means is constituted by a solenoid valve also allowing adjustment of the pressure, therefore of the flow rate, in the main conduits and of enrichment in combustible gas in addition to the injectors 12a and 12b.
  • the injectors 12a and 12b therefore regulate the flow rate, alone or in addition to the control means 2 depending on whether or not its regulation system is used.
  • Arrow 1 shows the direction of gas supply to the main solenoid valve.
  • the control means 2 has a gas inlet channel and two main and pilot outlet channels to which the main supply conduit 8 and the fuel gas enrichment conduit 6 are respectively connected.
  • a solenoid valve "SIT 822 NOVA” a simplified operating diagram of which is given in FIG. 2.
  • the reference 30 represents the general arrival of combustible gas
  • the references 32 and 34 respectively the main supply conduit 8 and the enrichment conduit 6 in combustible gas
  • the marks 36 and 38 two valves
  • the mark 40 a pressure regulator.
  • the valve 38 is not used (left open) while the valve 36 controls the simultaneous arrival of combustible gas in the two conduits 6 and 8.
  • the pressure regulator 40 regulates the pressure, therefore the flow rate, in the main oxidant gas supply pipe.
  • An embodiment method advantageously consists in using an enrichment flow rate representing approximately 10 to 20% of the main flow rate.
  • This relatively large quantity of enrichment gas makes it possible to obtain an easy, rapid and safe ignition of the burners by enriching homogeneously all of the gas injected during this period, while allowing optimal operation under normal conditions of use since the enrichment flow is only injected during the ignition cycle.
  • the invention is in no way limited to the embodiment described above.
  • any other means controlling the arrival of gas through the fuel gas enrichment pipe such as a simple tap or another igniter device such as a pyrophoric or piezoelectric device.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The feeder consists of a main gas feed circuit (8), an oxidant gas feeder (10), a fuel gas enrichment line, a mixing chamber (16) for the fuel and oxidant gases, connected to the burner (14a,b) before the fuel and oxidant feeds, and a control valve (4) which allows the fuel gas to pass along the enrichment line during the burner ignition stage only. The gas enrichment line (6) branches from the main fuel gas feed line (8) in a control box (10) which regulates the delivery of the fuel gas to the main (8) and enrichment (6) lines, each of which is divided into two or more branches (8a,b,6a,b) before they reach the mixing chamber. The mixing chamber is in the form of two curved ducts connected by a crosspiece (17) to which the branches lines are connected at right angles to one another.

Description

L'invention concerne un dispositif d'alimentation pour brûleurs à gaz et vise plus particulièrement à assurer un bon allumage, c'est-à-dire instantané, sûr et fiable de ces brûleurs tout en conservant un fonctionnement optimal hors période d'allumage.The invention relates to a supply device for gas burners and aims more particularly to ensure good ignition, that is to say instantaneous, safe and reliable of these burners while retaining optimal operation outside the ignition period.

On connaît déjà à partir de EP-B-0 157 375 un dispositif d'alimentation d'un brûleur en un mélange de gaz combustible et de gaz comburant comportant :

  • un conduit principal d'alimentation en gaz combustible,
  • un moyen d'alimentation en gaz comburant,
  • un conduit d'enrichissement du brûleur en gaz combustible,
  • une chambre de mélange du gaz combustible et du gaz comburant, propre à communiquer avec ledit brûleur, en partie aval suivant le sens de circulation du gaz combustible, et à laquelle se raccordent, en partie amont, le conduit principal d'alimentation en gaz combustible et le moyen d'alimentation en gaz comburant,
  • une vanne pour autoriser le passage du gaz combustible également dans le conduit d'enrichissement pendant une période d'allumage du brûleur.
EP-B-0 157 375 already discloses a device for supplying a burner with a mixture of combustible gas and oxidizing gas comprising:
  • a main fuel gas supply duct,
  • an oxidizing gas supply means,
  • a fuel gas enrichment duct for the burner,
  • a chamber for mixing the combustible gas and the oxidizing gas, suitable for communicating with the said burner, partly downstream in the direction of circulation of the combustible gas, and to which the main fuel gas supply pipe is connected, partly upstream and the means for supplying oxidizing gas,
  • a valve for authorizing the passage of combustible gas also in the enrichment duct during a burner ignition period.

Mais, dans le dispositif d'alimentation de ce brevet, le gaz combustible issu du conduit principal et le gaz combustible issu du conduit d'enrichissement sont acheminés par deux voies (conduits) distinctes jusqu'au brûleur.However, in the supply device of this patent, the combustible gas coming from the main pipe and the combustible gas coming from the enrichment pipe are conveyed by two separate paths (pipes) to the burner.

Par conséquent, seule une partie du mélange sera enrichie. Ce qui ne permet pas d'avoir une bonne homogénéité du mélange gaz combustible/gaz comburant dans toute la zone de combustion. Le mélange risque donc d'être trop riche en gaz combustible à certains endroits et trop pauvre à d'autres, et peut alors avoir du mal à s'enflammer. Si, pour pallier cette difficulté d'allumage, on enrichit davantage le mélange en gaz combustible, on risque de perturber les caractéristiques de combustion, donc le rendement du brûleur une fois le régime transitoire d'allumage terminé, sans pour autant obtenir un allumage réellement fiable.Therefore, only part of the mixture will be enriched. This does not allow good homogeneity of the fuel gas / oxidant gas mixture throughout the combustion zone. The mixture therefore risks being too rich in combustible gas in some places and too poor in others, and can then have trouble igniting. If, to overcome this ignition difficulty, the mixture is further enriched in gas combustible, there is a risk of disturbing the combustion characteristics, therefore the efficiency of the burner once the transient ignition regime has ended, without however obtaining a truly reliable ignition.

D'autre part, le brevet GB-B-2 221 026 décrit un brûleur à gaz destiné à produire un effet visuel de flamme et comportant :

  • un conduit principal d'alimentation en gaz combustible,
  • un moyen d'alimentation en gaz comburant,
  • un conduit d'enrichissement du mélange en gaz combustible, branché en dérivation sur le conduit d'alimentation en gaz combustible, et
  • une chambre de mélange du gaz combustible et du gaz comburant, propre à communiquer avec ledit brûleur, en partie aval suivant le sens de circulation du gaz combustible, et à laquelle se raccordent, en partie amont, le conduit principal d'alimentation en gaz combustible, le moyen d'alimentation en gaz comburant, et dans une réalisation possible, le conduit d'enrichissement du mélange en gaz combustible, et
  • une vanne pour interrompre le passage du gaz combustible dans le conduit d'enrichissement afin de brûler la suie accumulée.
On the other hand, patent GB-B-2 221 026 describes a gas burner intended to produce a visual flame effect and comprising:
  • a main fuel gas supply duct,
  • an oxidizing gas supply means,
  • a fuel gas enrichment pipe, connected in diversion to the fuel gas supply pipe, and
  • a chamber for mixing the combustible gas and the oxidizing gas, suitable for communicating with the said burner, partly downstream in the direction of circulation of the combustible gas, and to which the main fuel gas supply pipe is connected, partly upstream , the means for supplying oxidizing gas, and in one possible embodiment, the conduit for enriching the mixture with combustible gas, and
  • a valve for interrupting the passage of combustible gas in the enrichment conduit in order to burn the accumulated soot.

Mais, en utilisation normale, ce brûleur fonctionne en permanence en mélange enrichi (hors période d'allumage). Ce brûleur ne répond donc pas au problème de l'invention (qui est au demeurant indifférent à un quelconque effet visuel), puisque le fonctionnement normal est dégradé (mélange de combustion trop riche), ce qui se traduit par une consommation excessive en gaz combustible et par une production de suie et certainement d'autres produits non souhaités.However, in normal use, this burner operates continuously in an enriched mixture (outside the ignition period). This burner therefore does not respond to the problem of the invention (which is incidentally indifferent to any visual effect), since normal operation is degraded (combustion mixture too rich), which results in excessive consumption of combustible gas and by producing soot and certainly other unwanted products.

Dans ces conditions, la présente invention a donc plus particulièrement pour objet de perfectionner l'alimentation des brûleurs à gaz, notamment des brûleurs radiants à plaquette céramique, voire des brûleurs torche, afin d'assurer un allumage rapide et fiable du mélange gazeux, ainsi qu'un bon rendement en fonctionnement hors période d'allumage, ceci dans des conditions économiquement satisfaisantes.Under these conditions, the present invention therefore more particularly aims to improve the supply of gas burners, in particular radiant burners with ceramic plates, or even torch burners, in order to ensure rapid and reliable ignition of the mixture. gaseous, as well as good operating performance outside the ignition period, this under economically satisfactory conditions.

Selon l'invention, le dispositif d'alimentation proposé pour résoudre ce problème se caractérise, par rapport à la structure de base précitée de EP-B-0 157 375 considéré comme art antérieur le plus proche, en ce que le conduit d'enrichissement du mélange en gaz combustible est branché en dérivation sur le conduit d'alimentation en gaz combustible et qu'il se raccorde en aval à ladite chambre de mélange.According to the invention, the supply device proposed to solve this problem is characterized, compared to the aforementioned basic structure of EP-B-0 157 375 considered as closest prior art, in that the enrichment conduit of the combustible gas mixture is connected in bypass to the fuel gas supply pipe and that it is connected downstream to said mixing chamber.

Ainsi, on résout les problèmes déjà évoqués en enrichissant en amont de la chambre de mélange (de préférence de 10 à 20%), de façon à obtenir un mélange de richesse homogène en combustible et comburant avant d'alimenter le brûleur, à la différence de EP-0 157 375 qui, en séparant les conduit principal et d'enrichissement ne va permettre de n'enrichir que ponctuellement (au seul niveau d'une zone d'allumage) le brûleur.Thus, the problems already mentioned are solved by enriching upstream of the mixing chamber (preferably from 10 to 20%), so as to obtain a mixture of homogeneous richness in fuel and oxidizer before feeding the burner, unlike of EP-0 157 375 which, by separating the main and enrichment ducts, will only allow the burner to be enriched occasionally (at the only level of an ignition zone).

Pour éviter toute ambiguïté, on définit dans l'invention la "période d'allumage" comme la période, correspondant au minimum au temps d'étincelage ou de mise en flamme pour un dispositif allumeur, préalable au régime nominal stable de combustion.To avoid any ambiguity, the "ignition period" is defined in the invention as the period, corresponding at least to the spark or flame time for an igniter device, prior to the stable nominal combustion regime.

Un autre problème résolu par l'invention consiste à pouvoir d'une part couper l'arrivée générale de gaz et d'autre part obtenir aisément une richesse du mélange gazeux qui soit adaptée aux conditions d'allumage tout en réglant la richesse en condition de fonctionnement normal pour obtenir un rendement optimal.Another problem solved by the invention consists in being able, on the one hand, to cut off the general supply of gas and, on the other hand, to easily obtain a richness of the gaseous mixture which is adapted to the ignition conditions while adjusting the richness under the condition of normal operation for optimum performance.

La solution de l'invention consiste en un moyen de commande permettant l'arrivée simultanée de gaz dans les conduits principal et d'enrichissement en gaz combustible, et également de réguler la pression. L'avantage de cette solution est d'obtenir une bonne stabilité de la flamme et un excellent rendement en enrichissant dans chacune des phases, allumage ou fonctionnement normal, ni trop ni trop peu et cela quelque soit le gaz combustible utilisé (gaz manufacturés, gaz de pétrole, gaz naturels,...), et également de pouvoir aisément commander l'arrivée générale de gaz.The solution of the invention consists of a control means allowing the simultaneous arrival of gas in the main conduits and enrichment with combustible gas, and also to regulate the pressure. The advantage of this solution is to obtain good flame stability and an excellent yield by enriching in each phase, ignition or normal operation, neither too much nor too little, regardless of the combustible gas used (manufactured gases, petroleum gas, natural gases, ...), and also to be able to easily control the general gas supply.

Il s'est avéré que la solution générale de l'invention permet en outre d'alimenter plusieurs brûleurs à partir d'un dispositif d'alimentation unique. Pour ce faire, les conduits principal et d'enrichissement se divisent chacun en plusieurs branches en amont de la chambre de mélange, laquelle comporte un caisson multiple comprenant au moins deux voies coudées réunies entre elles en amont par un tronçon transversal sur lequel est branché le moyen d'alimentation en gaz comburant, chaque voie se raccordant en aval à un brûleur et chaque branche desdits conduits de gaz combustible principal et d'enrichissement se raccordant à la chambre de mélange sensiblement dans le plan général de la voie correspondante. Cette solution permet d'alimenter plusieurs brûleurs avec un mélange homogène et correctement dosé, tout en n'ayant qu'un dispositif d'alimentation, afin de réduire le coût notamment de fabrication de l'ensemble et le temps de réglage du brûleur.It has been found that the general solution of the invention also makes it possible to supply several burners from a single supply device. To do this, the main and enrichment conduits are each divided into several branches upstream of the mixing chamber, which comprises a multiple box comprising at least two bent channels joined together upstream by a transverse section to which the means for supplying oxidant gas, each channel connecting downstream to a burner and each branch of said main fuel and enrichment gas conduits connecting to the mixing chamber substantially in the general plane of the corresponding channel. This solution makes it possible to supply several burners with a homogeneous and correctly dosed mixture, while having only one supply device, in order to reduce the cost, in particular of manufacturing the assembly, and the adjustment time of the burner.

Par ailleurs, il s'est révélé important de chercher à optimiser l'homogénéité du mélange gaz combustible/gaz comburant. Selon une caractéristique de l'invention, les conduits de gaz combustible principal et d'enrichissement se raccordent avantageusement pour cela à la chambre de mélange sensiblement perpendiculairement l'un à l'autre et à proximité l'un de l'autre et le gaz comburant débouche, à un endroit, dans chambre de mélange à proximité immédiate de l'endroit du raccordement desdits conduits de gaz combustible principal et d'enrichissement et sensiblement perpendiculairement à chacun de ces conduits. Cette solution permet de créer un régime bénéfique d'écoulement turbulent de ces gaz, propice à leur mélange.Furthermore, it has proved important to seek to optimize the homogeneity of the fuel gas / oxidant gas mixture. According to a characteristic of the invention, the main combustible and enrichment gas conduits advantageously connect for this to the mixing chamber substantially perpendicular to one another and close to each other and the gas oxidizer opens, at a location, in a mixing chamber in the immediate vicinity of the location of the connection of said main fuel and enrichment gas conduits and substantially perpendicular to each of these conduits. This solution makes it possible to create a beneficial regime of turbulent flow of these gases, conducive to their mixing.

D'autres caractéristiques et avantages de l'invention apparaîtront de la description qui va suivre, faite en référence aux dessins annexés dans lesquels :

  • la figure 1 est un schéma du dispositif de l'invention,
  • la figure 2 est un schéma de fonctionnement d'une réalisation préférée du moyen de commande d'arrivée de gaz combustible.
Other characteristics and advantages of the invention will appear from the description which follows, given with reference to the appended drawings in which:
  • FIG. 1 is a diagram of the device of the invention,
  • Figure 2 is a block diagram of a preferred embodiment of the fuel gas inlet control means.

Un moyen de mélange de gaz comburant et de gaz combustible, ici une chambre de mélange 16, est alimenté en gaz comburant par un ventilateur 10, et en gaz combustible par un conduit principal 8 et un conduit d'enrichissement 6. Cette chambre de mélange alimente en mélange gazeux au moins un brûleur.A means of mixing oxidizing gas and combustible gas, here a mixing chamber 16, is supplied with oxidizing gas by a fan 10, and with combustible gas by a main duct 8 and an enrichment duct 6. This mixing chamber feeds a gas mixture to at least one burner.

Dans le cas illustré, le dispositif alimente deux brûleurs 14a, 14b. La chambre de mélange 16 comporte un caissson multiple comprenant deux voies coudées (a et b). Un tronçon transversal 17 sur lequel est branché en position sensiblement centrale le ventilateur 10 réunit en amont ces deux voies. Les conduits principal et d'enrichissement en gaz combustible se divisent en deux branches avant introduction du gaz dans le moyen de mélange. Pour chacune des branches, les deux conduits débouchent sensiblement perpendiculairement entre eux et à proximité l'un de l'autre, dans le plan général de la voie correspondante, dans la chambre de mélange (vers l'extrémité amont 18 des voies a et b) tout en étant chacun disposé sensiblement perpendiculairement et à proximité immédiate de l'arrivée d'air comburant. En effet, l'air comburant, soufflé par le ventilateur 10, se divise dans le tronçon central 17 en deux flux circulant vers chacune des voies de la chambre de mélange. Ces arrivées perpendiculaires ont pour but de réaliser un mélange optimal des gaz combustible et comburant en créant dès la partie amont de la chambre, un régime turbulent d'écoulement de ces gaz complété en cela par la forme coudée de la chambre de mélange.In the illustrated case, the device feeds two burners 14a, 14b. The mixing chamber 16 comprises a multiple box comprising two bent channels (a and b). A transverse section 17 on which is connected in a substantially central position, the fan 10 brings these two paths upstream. The main and fuel gas enrichment conduits are divided into two branches before the gas is introduced into the mixing means. For each of the branches, the two conduits open substantially perpendicularly to each other and close to one another, in the general plane of the corresponding channel, in the mixing chamber (towards the upstream end 18 of the channels a and b ) while being each arranged substantially perpendicularly and in the immediate vicinity of the combustion air inlet. Indeed, the combustion air, blown by the fan 10, is divided in the central section 17 into two flows circulating towards each of the channels of the mixing chamber. The aim of these perpendicular arrivals is to achieve an optimal mixture of combustible and oxidizing gases by creating, from the upstream part of the chamber, a turbulent flow regime for these gases supplemented in this by the bent shape of the mixing chamber.

Une vanne 4 placée sur le conduit d'enrichissement 6, permet d'interrompre le débit de gaz combustible circulant dans ce conduit, tandis qu'un moyen de commande 2 permet ou empêche l'arrivée de gaz combustible dans les conduits principal 8 et d'enrichissement 6 en gaz combustible. Ici, ce moyen est constitué par une électrovanne permettant également le réglage de la pression, donc du débit, dans les conduits principal et d'enrichissement en gaz combustible en complément des injecteurs 12a et 12b. Les injecteurs 12a et 12b régulent donc le débit, seuls ou en complément du moyen de commande 2 selon que l'on utilise ou non son système de régulation. La flèche 1 montre le sens d'alimentation en gaz de l'électrovanne principale.A valve 4 placed on the enrichment pipe 6 makes it possible to interrupt the flow of combustible gas circulating in this pipe, while a control means 2 allows or prevents the arrival of combustible gas in the main pipes 8 and d enrichment 6 in combustible gas. Here, this means is constituted by a solenoid valve also allowing adjustment of the pressure, therefore of the flow rate, in the main conduits and of enrichment in combustible gas in addition to the injectors 12a and 12b. The injectors 12a and 12b therefore regulate the flow rate, alone or in addition to the control means 2 depending on whether or not its regulation system is used. Arrow 1 shows the direction of gas supply to the main solenoid valve.

Selon une réalisation préférée, le moyen de commande 2 possède une voie d'arrivée de gaz et deux voies de sortie principale et veilleuse sur lesquelles on raccorde respectivement le conduit principal d'alimentation 8 et le conduit d'enrichissement 6 en gaz combustible. A titre d'exemple, on pourra notamment utiliser une électrovanne "SIT 822 NOVA" dont un schéma de fonctionnement simplifié est donné en figure 2. Dans cette figure, le repère 30 représente l'arrivée générale de gaz combustible, les repères 32 et 34 respectivement le conduit principal d'alimentation 8 et le conduit d'enrichissement 6 en gaz combustible, les repères 36 et 38 deux vannes et le repère 40 un régulateur de pression. Dans le cas de l'invention, la vanne 38 n'est pas utilisée (laissée ouverte) alors que la vanne 36 commande l'arrivée simultanée de gaz combustible dans les deux conduits 6 et 8. Enfin, le régulateur de pression 40 régule la pression, donc le débit, dans le conduit principal d'alimentation en gaz comburant.According to a preferred embodiment, the control means 2 has a gas inlet channel and two main and pilot outlet channels to which the main supply conduit 8 and the fuel gas enrichment conduit 6 are respectively connected. By way of example, it is possible in particular to use a solenoid valve "SIT 822 NOVA", a simplified operating diagram of which is given in FIG. 2. In this figure, the reference 30 represents the general arrival of combustible gas, the references 32 and 34 respectively the main supply conduit 8 and the enrichment conduit 6 in combustible gas, the marks 36 and 38 two valves and the mark 40 a pressure regulator. In the case of the invention, the valve 38 is not used (left open) while the valve 36 controls the simultaneous arrival of combustible gas in the two conduits 6 and 8. Finally, the pressure regulator 40 regulates the pressure, therefore the flow rate, in the main oxidant gas supply pipe.

Une méthode de réalisation consiste avantageusement à utiliser un débit d'enrichissement représentant environ 10 à 20% du débit principal. Cette quantité relativement importante de gaz d'enrichissement permet d'obtenir un allumage aisé, rapide et sûr des brûleurs en enrichissant de façon homogène l'ensemble du gaz injecté pendant cette période, tout en permettant un fonctionnement optimal en condition normale d'utilisation puisque le débit d'enrichissement n'est injecté que pendant le cycle d'allumage.An embodiment method advantageously consists in using an enrichment flow rate representing approximately 10 to 20% of the main flow rate. This relatively large quantity of enrichment gas makes it possible to obtain an easy, rapid and safe ignition of the burners by enriching homogeneously all of the gas injected during this period, while allowing optimal operation under normal conditions of use since the enrichment flow is only injected during the ignition cycle.

Le boîtier de contrôle 20 permet de coordonner la succession d'opérations d'un cycle d'allumage préféré :

  • on met le ventilateur en marche,
  • lorsque le gaz comburant atteint la pression désirée, l'allumeur 22 envoie une haute tension vers les électrodes 19 pour créer lors de l'allumage une sollicitation susceptible d'enflammer le gaz au moment déterminé,
  • on ouvre en même temps la vanne 4,
  • quelques fractions de secondes après (pour éviter l'accumulation du mélange gazeux de combustion), on ouvre le moyen de commande 2, permettant au gaz combustible d'arriver par les conduits principal et d'enrichissement,
  • au bout de cinq secondes (temps nécessaire pour garantir un bon allumage), l'allumeur cesse de délivrer une tension aux électrodes,
  • concomitamment ou du moins assez rapidement (de l'ordre de quelques secondes à quelques dizaines de secondes), on ferme le moyen de commande 4, le gaz combustible ne circule alors plus dans le conduit d'enrichissement.
  • le brûleur est alors en fonctionnement au régime nominal.
The control unit 20 makes it possible to coordinate the succession of operations of a preferred ignition cycle:
  • we turn on the fan,
  • when the oxidizing gas reaches the desired pressure, the igniter 22 sends a high voltage to the electrodes 19 to create, during ignition, a stress capable of igniting the gas at the determined moment,
  • valve 4 is opened at the same time,
  • a few fractions of seconds after (to avoid the accumulation of the gaseous combustion mixture), the control means 2 are opened, allowing the combustible gas to arrive via the main and enrichment conduits,
  • after five seconds (time necessary to guarantee good ignition), the igniter stops delivering voltage to the electrodes,
  • concomitantly or at least fairly quickly (of the order of a few seconds to a few tens of seconds), the control means 4 are closed, the combustible gas then no longer circulates in the enrichment conduit.
  • the burner is then operating at nominal speed.

On peut prévoir d'enrichir ainsi temporairement le mélange utile au fonctionnement en régime nominal, à chaque cycle d'allumage, et non pas uniquement au premier (à la première utilisation lorsque l'installation est froide).Provision can thus be made to temporarily enrich the mixture useful for operation at nominal speed, at each ignition cycle, and not only at the first (at the first use when the installation is cold).

Bien entendu, l'invention n'est nullement limitée au mode de réalisation décrit ci-dessus. Ainsi, on pourrait envisager tout autre moyen commandant l'arrivée de gaz par le conduit d'enrichissement en gaz combustible tel qu'un simple robinet ou un autre dispositif allumeur tel qu'un dispositif pyrophorique ou piézo-électrique.Of course, the invention is in no way limited to the embodiment described above. Thus, one could consider any other means controlling the arrival of gas through the fuel gas enrichment pipe such as a simple tap or another igniter device such as a pyrophoric or piezoelectric device.

Claims (5)

Dispositif d'alimentation d'au moins un brûleur en un mélange de gaz combustible et de gaz comburant comportant : - un conduit principal d'alimentation en gaz combustible (8), - un moyen d'alimentation en gaz comburant (10), - un conduit d'enrichissement (6) du brûleur en gaz combustible, - une chambre de mélange (16) du gaz combustible et du gaz comburant, propre à communiquer avec ledit brûleur (14), en aval par rapport au sens de circulation du gaz combustible et à laquelle se raccordent en amont le conduit principal d'alimentation en gaz combustible (8), le moyen d'alimentation en gaz comburant (10), et - une vanne (4) pour autoriser le passage du gaz combustible également dans le conduit d'enrichissement (6) uniquement pendant une période d'allumage du brûleur. caractérisé en ce que le conduit d'enrichissement (6) du mélange en gaz combustible est branché en dérivation sur le conduit d'alimentation en gaz combustible (8) et se raccorde en aval à ladite chambre de mélange.Device for supplying at least one burner with a mixture of combustible gas and oxidizing gas comprising: - a main fuel gas supply pipe (8), a means for supplying oxidizing gas (10), - a fuel gas enrichment pipe (6), - a mixing chamber (16) of the combustible gas and of the oxidizing gas, suitable for communicating with the said burner (14), downstream with respect to the direction of circulation of the combustible gas and to which the main supply duct is connected upstream in combustible gas (8), the oxidizing gas supply means (10), and - a valve (4) for authorizing the passage of combustible gas also in the enrichment duct (6) only during a period of ignition of the burner. characterized in that the enrichment pipe (6) of the combustible gas mixture is connected in branch to the fuel gas supply pipe (8) and is connected downstream to said mixing chamber. Dispositif selon la revendication 1, caractérisé en ce qu'il comprend également un moyen de commande (2), placé en amont du conduit de dérivation pour commander et/ou réguler l'arrivée simultanée de gaz combustible dans les conduits principal et d'enrichissement.Device according to claim 1, characterized in that it also comprises a control means (2), placed upstream of the bypass duct to control and / or regulate the simultaneous arrival of combustible gas in the main and enrichment ducts . Dispositif selon l'une des revendications précédentes, caractérisé en ce que les conduits principal et d'enrichissement se divisent chacun en plusieurs branches (6a, 6b; 8a, 8b) en amont de la chambre de mélange, laquelle comporte un caisson multiple comprenant au moins deux voies coudées réunies entre elles en amont par un tronçon transversal sur lequel est branché le moyen d'alimentation en gaz comburant, chaque voie se raccordant en aval à un brûleur et chaque branche desdits conduits de gaz combustible principal et d'enrichissement se raccordant à la chambre de mélange sensiblement dans le plan général de la voie correspondante.Device according to one of the preceding claims, characterized in that the main and enrichment conduits are each divided into several branches (6a, 6b; 8a, 8b) upstream of the mixing chamber, which comprises a multiple box comprising at at least two bent paths joined together upstream by a transverse section to which the means for supplying oxidant gas is connected, each path connecting downstream to a burner and each branch of said main fuel and enrichment gas pipes connecting to the mixing chamber substantially in the general plane of the corresponding channel. Dispositif selon l'une des revendications précédentes, caractérisé en ce que les conduits de gaz combustible principal et d'enrichissement se raccordent à une zone en amont (18) de la chambre de mélange, sensiblement perpendiculairement l'un à l'autre et à proximité l'un de l'autre et le gaz comburant débouche localement dans la chambre de mélange à proximité immédiate de l'endroit du raccordement desdits conduits de gaz combustible principal et d'enrichissement et sensiblement perpendiculairement à chacun de ces conduits.Device according to one of the preceding claims, characterized in that the main combustible and enrichment gas conduits are connected to a zone upstream (18) of the mixing chamber, substantially perpendicular to each other and to proximity to one another and the oxidizing gas emerges locally in the mixing chamber in the immediate vicinity of the location of the connection of said main fuel and enrichment gas conduits and substantially perpendicular to each of these conduits. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le moyen de commande (2) comprend une électrovanne possédant une arrivée générale (30) et deux voies de sorties principale et veilleuse sur lesquelles on raccorde respectivement le conduit principal d'alimentation (8) et le conduit d'enrichissement (6) en gaz combustible.Device according to one of the preceding claims, characterized in that the control means (2) comprises a solenoid valve having a general inlet (30) and two main and pilot outlet channels to which the main supply duct ( 8) and the fuel gas enrichment pipe (6).
EP96400752A 1995-04-10 1996-04-05 Gas burner feeding device Expired - Lifetime EP0737838B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9504262A FR2732751B1 (en) 1995-04-10 1995-04-10 SUPPLY DEVICE AND OPERATION METHOD OF A GAS BURNER
FR9504262 1995-04-10

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EP0737838A1 true EP0737838A1 (en) 1996-10-16
EP0737838B1 EP0737838B1 (en) 1999-12-29

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EP96400752A Expired - Lifetime EP0737838B1 (en) 1995-04-10 1996-04-05 Gas burner feeding device

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EP (1) EP0737838B1 (en)
AT (1) ATE188286T1 (en)
DE (1) DE69605839T2 (en)
DK (1) DK0737838T3 (en)
ES (1) ES2141447T3 (en)
FR (1) FR2732751B1 (en)
GR (1) GR3032428T3 (en)
PT (1) PT737838E (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4224019A (en) * 1978-02-27 1980-09-23 Westinghouse Electric Corp. Power burner for compact furnace
US4297987A (en) * 1979-05-11 1981-11-03 Amana Refrigeration, Inc. Heat exchange system
US4534728A (en) * 1984-04-02 1985-08-13 Honeywell Inc. Combination gas enricher, spark igniter, flame sensor
GB2221026A (en) * 1988-06-04 1990-01-24 Glow Worm Ltd Gas burner
JPH02242014A (en) * 1989-03-13 1990-09-26 Rinnai Corp Combustion control device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4224019A (en) * 1978-02-27 1980-09-23 Westinghouse Electric Corp. Power burner for compact furnace
US4297987A (en) * 1979-05-11 1981-11-03 Amana Refrigeration, Inc. Heat exchange system
US4534728A (en) * 1984-04-02 1985-08-13 Honeywell Inc. Combination gas enricher, spark igniter, flame sensor
EP0157375B1 (en) * 1984-04-02 1989-12-13 Honeywell Inc. Spark ignition apparatus
GB2221026A (en) * 1988-06-04 1990-01-24 Glow Worm Ltd Gas burner
JPH02242014A (en) * 1989-03-13 1990-09-26 Rinnai Corp Combustion control device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 567 (M - 1059) 17 December 1990 (1990-12-17) *

Also Published As

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ES2141447T3 (en) 2000-03-16
ATE188286T1 (en) 2000-01-15
DE69605839D1 (en) 2000-02-03
GR3032428T3 (en) 2000-05-31
DE69605839T2 (en) 2000-05-18
DK0737838T3 (en) 2000-06-13
FR2732751B1 (en) 1997-05-16
EP0737838B1 (en) 1999-12-29
FR2732751A1 (en) 1996-10-11
PT737838E (en) 2000-05-31

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