EP0099813A2 - Method for the treatment of combustible gas, and installation for carrying out the method - Google Patents

Method for the treatment of combustible gas, and installation for carrying out the method Download PDF

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Publication number
EP0099813A2
EP0099813A2 EP83401421A EP83401421A EP0099813A2 EP 0099813 A2 EP0099813 A2 EP 0099813A2 EP 83401421 A EP83401421 A EP 83401421A EP 83401421 A EP83401421 A EP 83401421A EP 0099813 A2 EP0099813 A2 EP 0099813A2
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EP
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Prior art keywords
gas
boiler
booster
pressure
controlled
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EP83401421A
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German (de)
French (fr)
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EP0099813A3 (en
EP0099813B1 (en
Inventor
Michel Cherpaz
Jean-Marie Vanzemberg
Jacques Druelle
Jean Bernard
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D'ETUDES TECHNIQUES ET D'ENTREPRISES GENERALES SODETEG Ste
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D'ETUDES TECHNIQUES ET D'ENTREPRISES GENERALES SODETEG Ste
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/002—Gaseous fuel

Definitions

  • the invention relates to a process for the treatment of combustible gas produced or extracted in variable quantities, said process having mainly the aim of the immediate combustion of at least most of the gas in a boiler for use, avoiding an expensive intermediate storage carried out at high pressure.
  • the invention also relates to a fuel gas installation for the implementation of this process.
  • a field of application of the invention may be that of a potato packaging plant (for the production of frozen food) where the treatments result in the formation of large quantities of effluents with a high content of organic matter.
  • Anaerobic fermentation leads to both very efficient purification (around 90%) and the production of biogas. The latter, if recovered, can cover a non-negligible part of the plant's energy needs.
  • These plants include steam production boilers that operate normally on natural gas. The invention can make it possible, in such a context, to significantly reduce the consumption of natural gas.
  • the invention goes against this concept by proposing a rational use of the biogas produced, as it is formed, without high pressure intermediate storage.
  • the invention therefore relates to a process for treating combustible gas produced in variable quantity, for the immediate combustion of at least the greatest part of said gas in a boiler, characterized in that it consists in carrying said gas at a relatively low pressure just necessary to allow the supply of said boiler, possibly recirculating a part of said compressed gas towards the production area of said gas to maintain a relatively constant pressure in this area.
  • the invention also relates to an installation for treating combustible gas produced in variable quantity, for example gas coming from an anaerobic fermentation tank containing organic matter, said treatment having mainly the aim of immediate combustion of at least the largest part of the gas in a boiler, characterized in that it comprises at least one booster connected upstream of said boiler, said booster being adjusted to bring said gas to a low pressure just necessary to allow the supply of said boiler and means for recirculating part of said compressed gas comprising in particular a controlled opening valve, controlled by a pressure sensor upstream of said booster.
  • the booster is of the constant flow type and the variable recirculation of the gas therefore makes it possible to regulate the value of the vacuum which prevails above the fermentation tank.
  • a flare is provided connected to the outlet of the booster by means of a controlled valve, of the progressive opening type, said valve being in particular controlled by a pressure sensor connected to the outlet of the booster. It is also possible to provide several boosters mounted in parallel and respectively put into service for predetermined flow ranges, for example by means of measuring the pressure upstream of said boosters.
  • the fuel gas treatment installation is intended to be inserted between an anaerobic closing tank 11 and auxiliary burners 12 of a boiler 13.
  • the gas is sucked as it is formed in the tank 11 by a conduit 14 and passes through a drainage manhole 15 of the type with water level regulation in which the gas cooling condensates are recovered.
  • the outlet of the drainage manhole is connected via an all-or-nothing type valve 16 to the inputs of two boosters SI and S2 connected in parallel.
  • the outputs of these boosters supply the auxiliary burners 12, through an exhaust duct 17.
  • the boosters are adjusted to bring the gas to a low pressure just necessary to allow the supply of the boiler.
  • Gas recirculation means comprising a series connection 18 of several components are connected between the outputs and the inputs of the boosters.
  • This series connection includes a regulator 19, a cooling exchanger 20 and above all a controlled valve 21, of the progressive action type, controlled by a pressure sensor 22 connected upstream of the boosters between the drainage manhole 15 and the valve 16.
  • the signals generated by the sensor 22 are processed in a control unit 23 to, on the one hand actuate the opening of the valve 21 and, on the other hand, to selectively activate one or two blowers depending on flow ranges predetermined.
  • the production rate is linked to the pressure in the fermentation tank and the commissioning or stopping of the boosters will be done from different pressure thresholds, this pressure being measured by the sensor 22.
  • a flare 25 is connected to the common outlet of the boosters via a modulating electropneumatic valve 26 controlled by a pressure sensor 27 connected to the outlet of the boosters.
  • the admission of gas to the flare makes it possible to regulate to a certain extent the supply pressure of the boiler.
  • An oxygen rate analyzer 28, of the paramagnetic susceptibility type is connected (broken lines 29, 30, 31) at several points in the gas circulation circuit between the tank II and the boiler 13. This analyzer controls a system Security 32 capable of stopping the installation as soon as the oxygen content exceeds a predetermined value.
  • This security system controls in particular the valve 16 as well as another valve 33, of the all-or-nothing type, connected between the tank-booster link on the one hand and a gas evacuation chimney 34 on the other hand.
  • the operation of the installation which has just been described is very simple and follows clearly from the above description.
  • the biogas is sucked into the tank 11 by the booster or boosters S1, S2, the valve 16 being normally open and the valve 33 normally closed.
  • the biogas leaves part of its humidity in the drainage manhole 15.
  • a recycling of the pressurized gas, modulated by the valve 21, is carried out when the production of biogas in the tank 11 is less than the constant flow rate of the blower (s) put into service , which therefore makes it possible to maintain a substantially constant depression in the tank.
  • the pressure reducer 19 and the temperature exchanger 20 allow the fraction reinjected to be brought back to the initial temperature and pressure conditions.
  • the valve 16 is closed while the valve 33 opens putting the tank 11 in communication with the evacuation chimney 34; the blowers are taken out of service.
  • the invention is not limited to the embodiment of the installation which has just been described but includes all the technical equivalents of the means used if these are within the scope of the claims which follow.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Treatment Of Sludge (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

1. A method for treating fuel gases produced at variable quantity, characterized in that the gas is consumed in a boiler (13) at the rate of production, the pressure of the gas as admitted to the inlets of pressure increasing means (S1, S2) being previously raised by these means to the feed pressure of the boiler (13), that part of the gas pressurized to the feed pressure of the boiler is recirculated to the entry if the quantity of the produced gas becomes smaller than the predetermined rate of flow of the pressure increasing means (S1, S2) which increase the pressure of this produced gas to the boiler feed pressure, and that part of the gas which has been increased in pressure up to the feed pressure is burned off into the environment as being in excess in relation to the consumption rate of the boiler.

Description

L'invention concerne un procédé de traitement de gaz combustible produit ou extrait en quantité variable, ledit procédé ayant principalement pour but la combustion immédiate d'au moins la plus grande partie du gaz dans une chaudiere d'utilisation en évitant un stockage intermédiaire coûteux effectué à pression élevée. L'invention vise également une installation de gaz combustible pour la mise en oeuvre de ce procédé.The invention relates to a process for the treatment of combustible gas produced or extracted in variable quantities, said process having mainly the aim of the immediate combustion of at least most of the gas in a boiler for use, avoiding an expensive intermediate storage carried out at high pressure. The invention also relates to a fuel gas installation for the implementation of this process.

La nécessité de réaliser des économies d'énergie a conduit à s'intéresser au traitement de certains déchets organiques, principalement dans les industries agro-alimentaires, en vue de la production d'un gaz pauvre appelé "biogaz" comportant un taux de méthane suffisant pour qu'il constitue une source d'énergie d'appoint utilisable sur place. A titre d'exemple, un domaine d'application de l'invention peut être celui d'une usine de conditionnement de pommes de terre (pour la production d'aliments surgelés) où les traitements se traduisent par la formation de quantités importantes d'effluents à forte teneur en matieres organiques. Une fermentation anaérobie aboutit à la fois à une épuration très efficace (de l'ordre de 90 %) et à la production du biogaz. Ce dernier, s'il est récupère peut couvrir une part non négligeable des besoins énergétiques de l'usine. On trouve notamment dans ces usines des chaudieres de production de vapeur fonctionnant normalement au gaz naturel. L'invention peut permettre dans un tel contexte, de réduire sensiblement la consommation de gaz naturel.The need to save energy has led to an interest in the treatment of certain organic waste, mainly in the food industry, with a view to producing a lean gas called "biogas" with a sufficient methane content. so that it constitutes an additional source of energy usable on site. By way of example, a field of application of the invention may be that of a potato packaging plant (for the production of frozen food) where the treatments result in the formation of large quantities of effluents with a high content of organic matter. Anaerobic fermentation leads to both very efficient purification (around 90%) and the production of biogas. The latter, if recovered, can cover a non-negligible part of the plant's energy needs. These plants include steam production boilers that operate normally on natural gas. The invention can make it possible, in such a context, to significantly reduce the consumption of natural gas.

Jusqu'à présent, une semblable installation demandait des investissements importants dus au fait que le blogaz produit subissait un stockage intermédiaire sous haute pression, ce qui nécessitait des équipements encombrants et coûteux. Ce stockage intermédiaire était cependant jugé inévitable en raison de l'irrégularité même de la production de biogaz.Until now, a similar installation required significant investments due to the fact that the blogaz produced underwent intermediate storage under high pressure, which required bulky and expensive equipment. This intermediate storage was, however, considered inevitable due to the very irregularity of biogas production.

L'invention va à l'encontre de ce concept en proposant une utilisation rationelle du biogaz produit, au fur et à mesure de sa formation, sans stockage intermédiaire haute pression.The invention goes against this concept by proposing a rational use of the biogas produced, as it is formed, without high pressure intermediate storage.

Dans cet esprit, l'invention concerne donc un procède de traitement de gaz combustible produit en quantité variable, pour la combustion immédiate d'au moins la plus grande partie dudit gaz dans une chaudière, caractérisé en ce qu'il consiste à porter ledit gaz à une pression relativement faible juste nécessaire pour permettre l'alimentation de ladite chaudiere, en faisant recirculer éventuellement une partie dudit gaz comprimé vers la zone de production dudit gaz pour maintenir une pression relativement constante dans cette zone.In this spirit, the invention therefore relates to a process for treating combustible gas produced in variable quantity, for the immediate combustion of at least the greatest part of said gas in a boiler, characterized in that it consists in carrying said gas at a relatively low pressure just necessary to allow the supply of said boiler, possibly recirculating a part of said compressed gas towards the production area of said gas to maintain a relatively constant pressure in this area.

L'invention concerne également une installation de traitement de-gaz combustible produit en quantité variable par exemple du gaz provenant d'une cuve de fermentation anaérobie renfermant des matieres organiques, ledit traitement ayant principalement pour but la combustion immédiate d'au moins la plus grande partie du gaz dans une chaudiere, caractérisée en ce qu'elle comporte au moins un surpresseur branché en amont de ladite chaudière, ledit surpresseur étant réglé pour porter ledit gaz à une pression faible juste nécessaire pour permettre l'alimentation de ladite chaudiere et des moyens de recirculation d'une partie dudit gaz comprimé comportant notamment une vanne à ouverture commandée, pilotée par un capteur de la pression en amont dudit surpresseur.The invention also relates to an installation for treating combustible gas produced in variable quantity, for example gas coming from an anaerobic fermentation tank containing organic matter, said treatment having mainly the aim of immediate combustion of at least the largest part of the gas in a boiler, characterized in that it comprises at least one booster connected upstream of said boiler, said booster being adjusted to bring said gas to a low pressure just necessary to allow the supply of said boiler and means for recirculating part of said compressed gas comprising in particular a controlled opening valve, controlled by a pressure sensor upstream of said booster.

Le surpresseur est du type à débit constant et la recirculation variable du gaz permet donc de réguler la valeur de la dépression qui regne au-dessus de la cuve de fermentation.The booster is of the constant flow type and the variable recirculation of the gas therefore makes it possible to regulate the value of the vacuum which prevails above the fermentation tank.

Dans l'hypothese d'une surproduction de biogaz, on prévoit une torchère reliée à la sortie du surpresseur par l'intermédiaire d'une vanne commandée, du type à ouverture progressive, ladite vanne étant notamment pilotée par un capteur de pression connecté à la sortie du surpresseur. On peut également prévoir plusieurs surpres-" seurs montés en parallele et respectivement mis en service pour des plages de débit prédéterminées, par exemple grâce à des moyens de mesure de la pression en amont desdits surpresseurs.In the event of an overproduction of biogas, a flare is provided connected to the outlet of the booster by means of a controlled valve, of the progressive opening type, said valve being in particular controlled by a pressure sensor connected to the outlet of the booster. It is also possible to provide several boosters mounted in parallel and respectively put into service for predetermined flow ranges, for example by means of measuring the pressure upstream of said boosters.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaîtront mieux à la lumiere de la description qui va suivre d'une installation de traitement de gaz combustible selon le principe de l'invention, donnée uniquement à titre d'exemple et faite en référence au dessin annexé dans lequel :

  • - la figure unique est un schéma-bloc simplifié de l'installation conforme à l'invention.
The invention will be better understood and other advantages of it will appear better in the light of the following description of a fuel gas treatment installation according to the principle of the invention, given solely by way of example and made with reference to the attached drawing in which:
  • - The single figure is a simplified block diagram of the installation according to the invention.

L'installation de traitement de gaz combustible est destinée à être insérée entre une cuve de fermetation anaérobie 11 et des brûleurs auxiliaires 12 d'une chaudiere 13. Le gaz est aspiré au fur et à mesure de sa formation dans la cuve 11 par un conduit 14 et traverse un regard de drainage 15 du type à régulation de niveau d'eau dans lequel les condensats de refroidissement du gaz sont récupérés. La sortie du regard de drainage est connectée par l'intermédiaire d'une vanne du type tout ou rien 16 aux entrées de deux surpresseurs SI et S2 branchés en parallèle. Les sorties de ces surpresseurs alimentent les brûleurs auxiliaires 12, par un conduit d'évacuation 17. Les surpresseurs sont réglés pour porter le gaz à une pression faible juste nécessaire pour permettre l'alimentation de la chaudiere. Des moyens de recirculation du gaz comprenant un branchement série 18 de plusieurs composants sont connectés entre les sorties et les entrées des surpresseurs. Ce branchement série comporte un détendeur 19, un échangeur de refroidissement 20 et surtout une vanne commandée 21, du type à action progressive, pilotée par un capteur de pression 22 branché en amont des surpresseurs entre le regard de drainage 15 et la vanne 16. Les signaux élaborés par le capteur 22 sont traités dans une unité de commande 23 pour, d'une part actionner l'ouverture de la vanne 21 et, d'autre part, pour mettre en service sélectivement un ou deux surpresseurs en fonction de plages de débit prédéterminées. En effet, le débit de production est lié à la pression dans la cuve de fermentation et la mise en service ou l'arrêt des surpresseurs se fera à partir de seuils de pression differents, cette pression étant mesurée par le capteur 22.The fuel gas treatment installation is intended to be inserted between an anaerobic closing tank 11 and auxiliary burners 12 of a boiler 13. The gas is sucked as it is formed in the tank 11 by a conduit 14 and passes through a drainage manhole 15 of the type with water level regulation in which the gas cooling condensates are recovered. The outlet of the drainage manhole is connected via an all-or-nothing type valve 16 to the inputs of two boosters SI and S2 connected in parallel. The outputs of these boosters supply the auxiliary burners 12, through an exhaust duct 17. The boosters are adjusted to bring the gas to a low pressure just necessary to allow the supply of the boiler. Gas recirculation means comprising a series connection 18 of several components are connected between the outputs and the inputs of the boosters. This series connection includes a regulator 19, a cooling exchanger 20 and above all a controlled valve 21, of the progressive action type, controlled by a pressure sensor 22 connected upstream of the boosters between the drainage manhole 15 and the valve 16. The signals generated by the sensor 22 are processed in a control unit 23 to, on the one hand actuate the opening of the valve 21 and, on the other hand, to selectively activate one or two blowers depending on flow ranges predetermined. In fact, the production rate is linked to the pressure in the fermentation tank and the commissioning or stopping of the boosters will be done from different pressure thresholds, this pressure being measured by the sensor 22.

Une torchere 25 est reliée à la sortie commune des surpresseurs par l'intermédiaire d'une vanne électropneumatique modulante 26 pilotée par un capteur de pression 27 connecte à la sortie des surpresseurs. L'admission du gaz à la torchere permet de réguler dans une certaine mesure la pression d'alimentation de la chaudiere. Un analyseur de taux d'oxygene 28, du type à susceptibilité paramagnétique est connecté (liaisons en trait interrompu 29, 30, 31) en plusieurs points du circuit de circulation du gaz entre la cuve Il et la chaudiere 13. Cet analyseur pilote un systeme de sécurité 32 susceptible d'arrêter l'installation des que la teneur en oxygène dépasse une valeur prédéterminée. Ce système de sécurité pilote notamment la vanne 16 ainsi qu'une autre vanne 33, du type tout ou rien, branchée entre la liaison cuve-surpresseur d'une part et une cheminée d'évacuation de gaz 34 d'autre part.A flare 25 is connected to the common outlet of the boosters via a modulating electropneumatic valve 26 controlled by a pressure sensor 27 connected to the outlet of the boosters. The admission of gas to the flare makes it possible to regulate to a certain extent the supply pressure of the boiler. An oxygen rate analyzer 28, of the paramagnetic susceptibility type is connected (broken lines 29, 30, 31) at several points in the gas circulation circuit between the tank II and the boiler 13. This analyzer controls a system Security 32 capable of stopping the installation as soon as the oxygen content exceeds a predetermined value. This security system controls in particular the valve 16 as well as another valve 33, of the all-or-nothing type, connected between the tank-booster link on the one hand and a gas evacuation chimney 34 on the other hand.

Le fonctionnement de l'installation qui vient d'être décrite est tres simple et découle avec évidence de la description qui précede. Au fur et à mesure de sa formation ,le biogaz est aspiré dans la cuve 11 par le ou les surpresseurs S1, S2, la vanne 16 étant normalement ouverte et la vanne 33 normalement fermée. Le biogaz abandonne une partie de son humidité dans le regard de drainage 15. Un recyclage du gaz surpressé, modulé par la vanne 21, est effectué lorsque la production de biogaz dans la cuve 11 est inférieure au débit constant du ou des surpresseurs mis en service, ce qui permet donc de maintenir une dépression sensiblement constante dans la cuve. Comme le gaz a été comprimé et qu'il s'est échauffé à travers le surpresseur, le détendeur 19 et l'échangeur de température 20 permettent de ramener la fraction réinjectée dans les conditions initiales de température et de pression. Lorsque la production est supérieure à la capacité des brûleurs 12 ou lorsque la chaudière est arrêtée, du biogaz est brûlé par la torchere 25. L'admission du gaz à la torchère est modulée par la vanne 26, ce qui permet de maintenir une pression sensiblement constante à l'entrée d'alimentation de la chaudière. Suivant les conditions de fonctionnement de cette der- niere, un nombre variable de brûleurs 12 peut être mis en service, chaque brûleur est donc commandé par une vanne électromagnétique du type tout ou rien, non representée. Le capteur de pression 27 peut piloter la mise en service des brûleurs 12, grâce à un systeme de régulation supplémentaire definissant des limites haute et basse de la plage de pression admise pour avoir une combustion correcte et sûre. Le nombre de brûleurs à mettre en fonctionnement étant ainsi établi en fonction du niveau de production de biogaz, le supplément de puissance de chauffage nécessaire au fonctionnement de la chaudiére 13 est assuré par du gaz naturel alimentant d'autres brûleurs non représentés.The operation of the installation which has just been described is very simple and follows clearly from the above description. As it is formed, the biogas is sucked into the tank 11 by the booster or boosters S1, S2, the valve 16 being normally open and the valve 33 normally closed. The biogas leaves part of its humidity in the drainage manhole 15. A recycling of the pressurized gas, modulated by the valve 21, is carried out when the production of biogas in the tank 11 is less than the constant flow rate of the blower (s) put into service , which therefore makes it possible to maintain a substantially constant depression in the tank. As the gas has been compressed and it has heated up through the booster, the pressure reducer 19 and the temperature exchanger 20 allow the fraction reinjected to be brought back to the initial temperature and pressure conditions. When the production is greater than the capacity of the burners 12 or when the boiler is stopped, biogas is burned by the flare 25. The admission of gas to the flare is modulated by the valve 26, which makes it possible to maintain a pressure substantially constant at the boiler supply input. Depending on the operating conditions of the latter, a variable number of burners 12 can be put into service, each burner is therefore controlled by an electromagnetic valve of the all or nothing type, not shown. The pressure sensor 27 can control the commissioning of the burners 12, thanks to an additional regulation system defining high and low limits of the pressure range accepted for correct and safe combustion. The number of burners to be put into operation being thus established as a function of the level of biogas production, the additional heating power necessary for the operation of the boiler 13 is provided by natural gas supplying other burners not shown.

Si l'analyseur 28 détecte un taux d'oxygène susceptible de former un mélange détonnant, la vanne 16 est fermée tandis que la vanne 33 s'ouvre mettant la cuve 11 en communication avec la cheminée d'évacuation 34 ; les surpresseurs sont mis hors service. Bien entendu, l'invention n'est pas limitée au mode de réalisation de l'installation qui vient d'être decrite mais comprend tous les equi- valents techniques des moyens mis en jeu si ceux-ci le sont dans le cadre des revendications qui suivent.If the analyzer 28 detects an oxygen level capable of forming an explosive mixture, the valve 16 is closed while the valve 33 opens putting the tank 11 in communication with the evacuation chimney 34; the blowers are taken out of service. Of course, the invention is not limited to the embodiment of the installation which has just been described but includes all the technical equivalents of the means used if these are within the scope of the claims which follow.

Claims (10)

1. Procédé de traitement de gaz combustible produit en quantité variable, pour la combustion immédiate d'au moins la plus grande partie dudit gaz dans une chaudiere (13), caracterisé en ce qu'il consiste à porter ledit gaz à une pression relativement faible, juste nécessaire pour permettre l'alimentation de ladite chaudière en faisant recirculer (18) éventuellement une partie dudit gaz comprimé vers la zone de production dudit gaz pour maintenir une pression relativement constante dans cette zone.1. A method of treating combustible gas produced in variable quantity, for the immediate combustion of at least most of said gas in a boiler (13), characterized in that it consists in bringing said gas to a relatively low pressure , just necessary to allow the supply of said boiler by recirculating (18) possibly a portion of said compressed gas towards the production area of said gas to maintain a relatively constant pressure in this area. 2. Procédé selon la revendication 1, caracterisé en ce qu'il consiste à brûler (25) au moins une partie dudit gaz dans l'atmosphère lorsque la production est supérieure aux besoins du moment.2. Method according to claim 1, characterized in that it consists in burning (25) at least a portion of said gas in the atmosphere when the production exceeds the needs of the moment. 3. Installation de traitement de gaz combustible produit en quantité variable, par exemple du gaz provenant d'une cuve de fermentation anaérobie (11) renfermant des matières organiques, ledit traitement ayant principalement pour but la combustion immédiate d'au moins la plus grande partie dudit gaz dans une chaudiere (13) caractérisée en ce qu'elle comporte au moins un surpresseur (SI, S2) branché en amont de ladite chaudiere, ledit surpresseur etant réglé pour porter ledit gaz à une pression faible juste nécessaire pour permettre l'alimentation de ladite chaudiere et des moyens de recirculation (18) d'une partie dudit gaz comprimé comportant notamment une vanne (21) commandée pilotée par un capteur de pression (22) placé en amont dudit surpresseur.3. Installation for the treatment of combustible gas produced in variable quantity, for example gas coming from an anaerobic fermentation tank (11) containing organic matter, said treatment having mainly for object the immediate combustion of at least the major part said gas in a boiler (13) characterized in that it comprises at least one booster (SI, S2) connected upstream of said boiler, said booster being adjusted to bring said gas to a low pressure just necessary to allow supply of said boiler and recirculation means (18) of a part of said compressed gas comprising in particular a valve (21) controlled controlled by a pressure sensor (22) placed upstream of said booster. 4. Installation selon la revendication 3, caractérisée en ce que ledit surpresseur est du type à débit constant.4. Installation according to claim 3, characterized in that said booster is of the constant flow type. 5. Installation selon la revendication 3, ou 4 caractérisée en ce que lesdits moyens de recirculation comprennent un branchement série (18) incluant ladite vanne (21) et un détendeur (19), branché entre la sortie et l'entrée dudit surpresseur.5. Installation according to claim 3, or 4 characterized in that said recirculation means comprise a series connection (18) including said valve (21) and a regulator (19), connected between the outlet and the inlet of said booster. 6. Installation selon la revendication 5, caractérisee en ce que ledit branchement série comporte en outre un échangeur de refroidissement (20).6. Installation according to claim 5, characterized in that said series connection further comprises a cooling exchanger (20). 7. Installation selon l'une des revendications 3 à 6, caracte- risee en ce qu'elle comporte plusieurs surpresseurs (SI, S2) à débit constant montés en parallele et respectivement mis en service pour des plages de débit prédéterminees, par exemple grâce à des moyens de mesure de la pression en amont desdits surpresseurs (22, 23).7. Installation according to one of claims 3 to 6, characterized in that it comprises several boosters (SI, S2) at constant flow rate mounted in parallel and respectively put into service for predetermined flow ranges, for example by to means for measuring the pressure upstream of said boosters (22, 23). 8. Installation selon l'une des revendications 3 à 7, caractérisée en ce qu'une torchere (25) est reliée à la sortie du ou des surpresseurs par l'intermédiaire d'une vanne commandée (26), ladite vanne étant notamment pilotée par un capteur de pression (27) connecté à la sortie du ou des surpresseurs.8. Installation according to one of claims 3 to 7, characterized in that a flare (25) is connected to the outlet of the booster or boosters via a controlled valve (26), said valve being in particular controlled by a pressure sensor (27) connected to the outlet of the booster (s). 9. Installation selon l'une des revendications 3 à 8, carac- terisée en ce qu'elle comporte un analyseur de taux d'oxygene (28), par exemple du type à susceptibilité paramagnétique, connecté en un ou plusieurs points du circuit de circulation de gaz en amont de ladite chaudiere (13) et un système de sécurité (32) piloté par ledit analyseur pour arrêter l'installation des que ladite teneur en oxygene dépasse une valeur prédéterminée.9. Installation according to one of claims 3 to 8, characterized in that it comprises an oxygen rate analyzer (28), for example of the paramagnetic susceptibility type, connected at one or more points of the circuit of gas circulation upstream of said boiler (13) and a security system (32) controlled by said analyzer to stop the installation as soon as said oxygen content exceeds a predetermined value. 10. Installation selon l'une des revendications 3 à 9, caractérisée en ce qu'elle comporte une cheminee d'évacuation dudit gaz (34) raccordée en amont du ou des surpresseurs (SI, S2) par l'intermédiaire d'une vanne commandée (33), du type tout ou rien, pilotée par un système de sécurité (28, 32).10. Installation according to one of claims 3 to 9, characterized in that it comprises a chimney for discharging said gas (34) connected upstream of the booster (s) (SI, S2) via a valve. controlled (33), all or nothing type, controlled by a security system (28, 32).
EP19830401421 1982-07-20 1983-07-08 Method for the treatment of combustible gas, and installation for carrying out the method Expired EP0099813B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8212653A FR2530488B1 (en) 1982-07-20 1982-07-20 PROCESS FOR TREATING FUEL GAS AND PLANT FOR CARRYING OUT SAID METHOD
FR8212653 1982-07-20

Publications (3)

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EP0099813A2 true EP0099813A2 (en) 1984-02-01
EP0099813A3 EP0099813A3 (en) 1985-06-19
EP0099813B1 EP0099813B1 (en) 1988-03-30

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EP (1) EP0099813B1 (en)
DE (1) DE3376134D1 (en)
FR (1) FR2530488B1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899013A (en) * 1956-04-09 1959-08-11 Nat Tank Co Apparatus for recovery of petroleum vapors from run tanks
FR1334393A (en) * 1962-06-18 1963-08-09 Rateau Soc Improvement in anti-pumping devices for coils or groups of compressors
FR1470495A (en) * 1965-03-18 1967-02-24 Oemv Ag Process and apparatus for the use or exploitation of combustible waste gases from refineries or other installations
FR2299593A1 (en) * 1974-08-21 1976-08-27 Boulord Pierre Liq-gas delivery at constant pressure esp at wellhead - by sepg the phases, increasing pressure of each and remixing for removal at same rate as introduction to separator
US4095934A (en) * 1977-03-24 1978-06-20 Mobil Oil Corporation Waste gas recovery
US4273514A (en) * 1978-10-06 1981-06-16 Ferakarn Limited Waste gas recovery systems

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899013A (en) * 1956-04-09 1959-08-11 Nat Tank Co Apparatus for recovery of petroleum vapors from run tanks
FR1334393A (en) * 1962-06-18 1963-08-09 Rateau Soc Improvement in anti-pumping devices for coils or groups of compressors
FR1470495A (en) * 1965-03-18 1967-02-24 Oemv Ag Process and apparatus for the use or exploitation of combustible waste gases from refineries or other installations
FR2299593A1 (en) * 1974-08-21 1976-08-27 Boulord Pierre Liq-gas delivery at constant pressure esp at wellhead - by sepg the phases, increasing pressure of each and remixing for removal at same rate as introduction to separator
US4095934A (en) * 1977-03-24 1978-06-20 Mobil Oil Corporation Waste gas recovery
US4273514A (en) * 1978-10-06 1981-06-16 Ferakarn Limited Waste gas recovery systems

Also Published As

Publication number Publication date
DE3376134D1 (en) 1988-05-05
FR2530488A1 (en) 1984-01-27
FR2530488B1 (en) 1984-12-28
EP0099813A3 (en) 1985-06-19
EP0099813B1 (en) 1988-03-30

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