EP0237069A1 - Device for supplying air to a boiler combustion chamber normally operating on natural gas during its operation on oil - Google Patents
Device for supplying air to a boiler combustion chamber normally operating on natural gas during its operation on oil Download PDFInfo
- Publication number
- EP0237069A1 EP0237069A1 EP87103596A EP87103596A EP0237069A1 EP 0237069 A1 EP0237069 A1 EP 0237069A1 EP 87103596 A EP87103596 A EP 87103596A EP 87103596 A EP87103596 A EP 87103596A EP 0237069 A1 EP0237069 A1 EP 0237069A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oil
- natural gas
- burners
- fans
- air
- 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
Links
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000003345 natural gas Substances 0.000 title claims abstract description 14
- 238000002485 combustion reaction Methods 0.000 title description 6
- 239000003921 oil Substances 0.000 claims abstract description 9
- 239000000295 fuel oil Substances 0.000 claims abstract description 8
- 239000000779 smoke Substances 0.000 claims abstract description 6
- 239000000446 fuel Substances 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000003517 fume Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000000567 combustion gas Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/02—Applications of combustion-control devices, e.g. tangential-firing burners, tilting burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C1/00—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air
- F23C1/08—Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in a carrier gas or air liquid and gaseous fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
Definitions
- the present invention relates to a device for supplying air to a boiler hearth, operating normally with natural gas with fans for sending air to the burners, for temporary operation with an emergency fuel constituted by fuel oil.
- the object of the present invention is to provide a supply device for temporary fuel oil operation which requires neither an oversizing of the main air fans nor the installation of a smoke recycling circuit, and reduces investment and additional energy consumption corresponding to the possibility of operation in emergency mode.
- the device according to the invention is characterized in that it includes an auxiliary fan for sending an additional flow of air to the burners during their operation with oil, and in that the smoke evacuation circuit does not involve any recycling of these.
- It also preferably includes tilting burners.
- the main fans are preferably chosen to have a maximum flow rate equal to that necessary for operation at maximum load with natural gas, and the maximum flow rate for the auxiliary fan corresponds to the additional air required for operation at maximum load with oil.
- the discharge of the auxiliary fan is advantageously connected to one and the other of those of the main fans, so as to reduce the drop in heating power in the event of a failure of one of the latter during gas operation. natural.
- the tilting burners allow the flame temperature zones to be moved upwards compared to those which would normally be established in oil operation with fixed burners, which makes it possible to adjust the temperature of the combustion gases at the level of the superheaters and reheaters. of the boiler.
- the air discharge ducts of the additional fan are ordinary non-insulated ducts, instead of the insulated ducts which would be required by the recycling of the fumes.
- the furnace of the boiler 1 is supplied in its corners with fuel and combustion air by series of superimposed burners, shown in arrows 2, 3, 4, 5.
- the combustion air is discharged by centrifugal fans 6, 7 towards the exchangers -recoveries 8, 9, where it heats up in contact with a material previously heated by the fumes resulting from combustion in the hearth.
- the heated air then travels through the insulated ducts 10 and 12 on the one hand, 11 and 13 on the other hand, to the series of burners 2 and 3 on the one hand, 4 and 5 on the other hand, where it ensures during normal operation, the combustion of natural gas, arriving via pipes not shown.
- These burners are tiltable, so as to compensate by tilting upwards part of the decrease in the temperature of the combustion gases at the level of the superheaters and reheaters of the boiler resulting from the substitution of fuel oil for natural gas.
- the fumes evacuated from the hearth and from the overheating and reheating exchangers are sent back through the conduits 14 and 15 to the exchanger-recuperators 8 and 9, where they transfer part of their sensible heat, then pass through the conduits 16 and 17 to the fireplace 18.
- the auxiliary centrifugal fan 19 is put into operation. This blows in the additional cold air necessary for the combustion of the oil, on the one hand through the conduit 20 into the conduit 12, on the other hand by the conduit 21 in the conduit 13.
- the main fans 6 and 7 are sized to each supply 50% of the flow corresponding to the nominal operation of the boiler at full power.
- the auxiliary fan is dimensioned to provide, for example, around 20% of the flow rate corresponding to nominal operation. In the event of a failure of one of the main fans during normal natural gas operation, it is thus possible to ensure operation at 70% of the maximum power. In an installation intended to provide emergency operation by recycling smoke, it would have been necessary to oversize each of the main fans, which corresponded to allowing each of them to ensure approximately 60% of the flow corresponding to nominal operation, and the power reached in the event of a failure of one of them would therefore have been only 60% of the nominal power.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Combustion Of Fluid Fuel (AREA)
- Air Supply (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
Dispositif d'alimentation d'un foyer de chaudière (1) fonctionnant normalement au gaz naturel avec des ventilateurs (6, 7) d'envoi d'air aux brûleurs (2, 3, 4, 5) pour fonctionnement temporaire avec un combustible de secours constitué par du mazout. Il comporte un ventilateur d'appoint (19) d'envoi d'un débit supplémentaire d'air aux brûleurs lors de leur fonctionnement au mazout, et le circuit d'évacuation des fumées (14, 15) ne comporte aucun recyclage de celles-ci. Les brûleurs sont de préférence inclinables. 
Description
La présente invention concerne un dispositif d'alimentation en air d'un foyer de chaudière, fonctionnant normalement au gaz naturel avec des ventilateurs d'envoi d'air aux brûleurs, pour fonctionnement temporaire avec un combustible de secours constitué par du mazout.The present invention relates to a device for supplying air to a boiler hearth, operating normally with natural gas with fans for sending air to the burners, for temporary operation with an emergency fuel constituted by fuel oil.
De tels dispositifs permettent, lors de l'utilisation en combustible de secours, de maintenir en fonctionnement une chaudière pour la production de vapeur, au prix d'une certaine réduction de la plage de fonctionnement optimal.
On a déjà proposé pour un fonctionnement temporaire au mazout d'un foyer de chaudière conçu pour une marche normale au gaz naturel d'utiliser des ventilateurs conçus pour refouler l'air sous une pression plus élevée que celle nécessitée par la marche normale au gaz naturel, et correspondant à la pression requise pour une marche au mazout, et de leur adjoindre des ventilateurs d'appoint et des circuits de recyclage des fumées vers le foyer par ces ventilateurs d'appoint. Ceci nécessite toutefois un surdimensionnement des ventilateurs principaux et l'installation et l'entretien d'au moins deux ventilateurs d'appoint et de gaines de recyclage calorifugées, et la puissance consommée en marche de secours par les ventilateurs principaux et les ventilateurs d'appoint est très notablement majorée par rapport à celle consommée en fonctionnement normal. L'installation de tels auxiliaires est donc coûteuse en investissements et en énergie. Par ailleurs, le fonctionnement du foyer est modifié, le mazout procurant une température de flamme plus faible que le gaz naturel, de sorte que la température des gaz de combustion au niveau des surchauffeurs et resurchauffeurs de la chaudière est abaissée et entraîne un rendement d'échange de chaleur moins favorable.Such devices make it possible, when using backup fuel, to keep a boiler for steam production in operation, at the cost of a certain reduction in the optimal operating range.
It has already been proposed for temporary fuel oil operation of a boiler hearth designed for normal operation with natural gas to use fans designed to discharge air under a higher pressure than that required by normal operation with natural gas , and corresponding to the pressure required for oil-fired operation, and to add auxiliary fans and smoke recycling circuits to the hearth by these auxiliary fans. However, this requires oversizing the main fans and the installation and maintenance of at least two booster fans and insulated recycling ducts, and the power consumed in emergency operation by the main fans and the booster fans. is very markedly increased compared to that consumed in normal operation. The installation of such auxiliaries is therefore costly in investment and in energy. In addition, the operation of the fireplace is modified, the oil providing a lower flame temperature than natural gas, so that the temperature of the combustion gases at the level of the superheaters and reheaters of the boiler is lowered and results in an efficiency of less favorable heat exchange.
La présente invention a pour but de procurer un dispositif d'alimentation pour fonctionnement temporaire au mazout qui ne nécessite ni un surdimensionnement des ventilateurs d'air principaux ni l'installation de circuit de recyclage de fumées, et réduise à un minimum l'investissement et la consommation d'énergie supplémentaires correspondant à la possibilité de fonctionnement en marche de secours.The object of the present invention is to provide a supply device for temporary fuel oil operation which requires neither an oversizing of the main air fans nor the installation of a smoke recycling circuit, and reduces investment and additional energy consumption corresponding to the possibility of operation in emergency mode.
Le dispositif selon l'invention est caractérisé en ce qu'il comporte un ventilateur d'appoint d'envoi d'un débit supplémentaire d'air aux brûleurs lors de leur fonctionnement au mazout, et en ce que le circuit d'évacuation des fumées ne comporte aucun recyclage de celles-ci.The device according to the invention is characterized in that it includes an auxiliary fan for sending an additional flow of air to the burners during their operation with oil, and in that the smoke evacuation circuit does not involve any recycling of these.
Il comporte en outre de préférence des brûleurs inclinables.It also preferably includes tilting burners.
On choisit de préférence des ventilateurs principaux de débit maximal égal à celui nécessaire pour le fonctionnement à charge maximale au gaz naturel, et le débit maximal du ventilateur d'appoint correspond au supplément d'air nécessaire pour le fonctionnement à charge maximale au mazout.The main fans are preferably chosen to have a maximum flow rate equal to that necessary for operation at maximum load with natural gas, and the maximum flow rate for the auxiliary fan corresponds to the additional air required for operation at maximum load with oil.
Le refoulement du ventilateur d'appoint est avantageusement relié à l'un et l'autre de ceux des ventilateurs principaux, de manière à réduire la chute de puissance de chauffe en cas de panne de l'un de ces derniers lors du fonctionnement au gaz naturel.The discharge of the auxiliary fan is advantageously connected to one and the other of those of the main fans, so as to reduce the drop in heating power in the event of a failure of one of the latter during gas operation. natural.
Les brûleurs inclinables permettent de déplacer vers le haut les zones de température de flamme par rapport à celles qui s'établiraient normalement en fonctionnement au mazout avec des brûleurs fixes, ce qui permet de régler la température des gaz de combustion au niveau des surchauffeurs et resurchauffeurs de la chaudière.The tilting burners allow the flame temperature zones to be moved upwards compared to those which would normally be established in oil operation with fixed burners, which makes it possible to adjust the temperature of the combustion gases at the level of the superheaters and reheaters. of the boiler.
Compte tenu du débit supplémentaire d'air nécessaire pour la marche au mazout, il suffit d'un seul ventilateur supplémentaire, au lieu des deux ventilateurs qui seraient nécessaires pour le recyclage des fumées. Par ailleurs, les gaines de refoulement de l'air du ventilateur supplémentaire sont des gaines non calorifugées ordinaires, au lieu des gaines calorifugées qui seraient nécessitées par le recyclage des fumées.Given the additional air flow required for fuel oil heating, a single additional fan is sufficient, instead of the two fans that would be required for recycling the fumes. Furthermore, the air discharge ducts of the additional fan are ordinary non-insulated ducts, instead of the insulated ducts which would be required by the recycling of the fumes.
Il est décrit ci-après, à titre d'exemple et en référence à la figure schématique du dessin annexé, un dispositif d'alimentation en air pour marche de secours au mazout d'un foyer de chaudière à gaz naturel, selon l'invention.It is described below, by way of example and with reference to the diagrammatic figure of the appended drawing, an air supply device for emergency operation with oil from a natural gas boiler home, according to the invention .
Le foyer de la chaudière 1 est alimenté dans ses angles en combustible et air comburant par des séries de brûleurs superposés, représentées en flèches 2, 3, 4, 5. L'air comburant est refoulé par les ventilateurs centrifuges 6, 7 vers les échangeurs-récupérateurs 8, 9, où il se réchauffe au contact d'un matériau préalablement réchauffé par les fumées résultant de la combustion dans le foyer. L'air réchauffé se rend alors par les conduits calorifugés 10 et 12 d'une part, 11 et 13 d'autre part, aux séries de brûleurs 2 et 3 d'une part, 4 et 5 d'autre part, où il assure en marche normale la combustion de gaz naturel, arrivant par des conduits non représentés.The furnace of the boiler 1 is supplied in its corners with fuel and combustion air by series of superimposed burners, shown in arrows 2, 3, 4, 5. The combustion air is discharged by
Ces brûleurs sont inclinables, de façon à permettre de compenser par une inclinaison vers le haut une partie de la diminution de la température des gaz de combustion au niveau des surchauffeurs et resurchauffeurs de la chaudière résultant de la substitution du mazout au gaz naturel.These burners are tiltable, so as to compensate by tilting upwards part of the decrease in the temperature of the combustion gases at the level of the superheaters and reheaters of the boiler resulting from the substitution of fuel oil for natural gas.
Les fumées évacuées du foyer et des échangeurs de surchauffe et resurchauffe, sont renvoyées par les conduits 14 et 15 vers les échangeurs-récupérateurs 8 et 9, où elles cèdent une partie de leur chaleur sensible, puis passent par les conduits 16 et 17 à la cheminée 18.The fumes evacuated from the hearth and from the overheating and reheating exchangers are sent back through the
En marche de secours au mazout, l'on met en fonctionnement le ventilateur centrifuge d'appoint 19. Celui- ci refoule l'air froid supplémentaire nécessaire pour la combustion du mazout, d'une part par le conduit 20 dans le conduit 12, d'autre part par le conduit 21 dans le conduit 13.In fuel oil emergency operation, the auxiliary
Les ventilateurs principaux 6 et 7 sont dimensionnés pour fournir chacun 50 % du débit correspondant au fonctionnement nominal de la chaudière à pleine puissance.The
Le ventilateur d'appoint est dimensionné pour fournir par exemple environ 20 % du débit correspondant au fonctionnement nominal. En cas de panne de l'un des ventilateurs principaux au cours du fonctionnement normal au gaz naturel, on peut ainsi assurer une marche à 70 % de la puissance maximale. Dans une installation prévue pour assurer la marche de secours par recyclage des fumées, il aurait fallu surdimensionner chacun des ventilateurs principaux, ce qui correspondait à permettre à chacun d'eux d'assurer 60 % environ du débit correspondant au fonctionnement nominal, et la puissance atteinte en cas de panne de l'un d'eux n'aurait donc été que de 60 % de la puissance nominale.The auxiliary fan is dimensioned to provide, for example, around 20% of the flow rate corresponding to nominal operation. In the event of a failure of one of the main fans during normal natural gas operation, it is thus possible to ensure operation at 70% of the maximum power. In an installation intended to provide emergency operation by recycling smoke, it would have been necessary to oversize each of the main fans, which corresponded to allowing each of them to ensure approximately 60% of the flow corresponding to nominal operation, and the power reached in the event of a failure of one of them would therefore have been only 60% of the nominal power.
Claims (4)
caractérisé en ce qu'il comporte un ventilateur d'appoint (19) d'envoi d'un débit supplémentaire d'air aux brûleurs lors de leur fonctionnement au mazout, et en ce que le circuit d'évacuation des fumées (14, 15) ne comporte aucun recyclage de celles-ci.1 / Device for supplying a boiler hearth (1) operating normally with natural gas with fans (6, 7) for sending air to the burners (2, 3, 4, 5) for temporary operation with a emergency fuel consisting of fuel oil,
characterized in that it includes an auxiliary fan (19) for sending an additional flow of air to the burners when they are operating with oil, and in that the smoke evacuation circuit (14, 15 ) does not include any recycling of these.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87103596T ATE50354T1 (en) | 1986-03-14 | 1987-03-12 | DEVICE FOR SUPPLYING AIR TO A BOILER WHICH IS NORMALLY FUEL WITH NATURAL GAS, WHILE AUXILIARY SERVICE WITH OIL. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8603693 | 1986-03-14 | ||
| FR8603693A FR2595790B1 (en) | 1986-03-14 | 1986-03-14 | AIR SUPPLY DEVICE FOR A BOILER FIREPLACE NORMALLY OPERATING WITH NATURAL GAS FOR FUEL BACKUP |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0237069A1 true EP0237069A1 (en) | 1987-09-16 |
| EP0237069B1 EP0237069B1 (en) | 1990-02-07 |
Family
ID=9333147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87103596A Expired - Lifetime EP0237069B1 (en) | 1986-03-14 | 1987-03-12 | Device for supplying air to a boiler combustion chamber normally operating on natural gas during its operation on oil |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4725224A (en) |
| EP (1) | EP0237069B1 (en) |
| AT (1) | ATE50354T1 (en) |
| DE (1) | DE3761707D1 (en) |
| FR (1) | FR2595790B1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8286594B2 (en) * | 2008-10-16 | 2012-10-16 | Lochinvar, Llc | Gas fired modulating water heating appliance with dual combustion air premix blowers |
| US8517720B2 (en) * | 2008-10-16 | 2013-08-27 | Lochinvar, Llc | Integrated dual chamber burner |
| US9097436B1 (en) | 2010-12-27 | 2015-08-04 | Lochinvar, Llc | Integrated dual chamber burner with remote communicating flame strip |
| CN102022749A (en) * | 2010-12-31 | 2011-04-20 | 广东理文造纸有限公司 | Boiler draught fan system |
| US9464805B2 (en) | 2013-01-16 | 2016-10-11 | Lochinvar, Llc | Modulating burner |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1099470A (en) * | 1953-01-16 | 1955-09-06 | Combustion Eng | Improvements made to steam generators |
| FR1188972A (en) * | 1956-12-24 | 1959-09-28 | Walther & Cie Ag | Boiler installation allowing, as desired, heating with combustible gas or with powdery fuel or with combustible oil |
| GB821423A (en) * | 1954-09-09 | 1959-10-07 | Thompson John Water Tube Boilers Ltd | Improvements relating to steam generators |
| FR1430692A (en) * | 1965-04-13 | 1966-03-04 | Nat Steel Corp | Superheater |
| DE1230512B (en) * | 1964-03-09 | 1966-12-15 | Hans Maile Fabrik Fuer Gasbren | Multi-stage gas or oil burner |
| DE1241929B (en) * | 1961-03-30 | 1967-06-08 | Steinmueller Gmbh L & C | Firing system for steam generators with two superimposed combustion chambers fired with oil and / or gas |
| US3789804A (en) * | 1972-12-14 | 1974-02-05 | Sulzer Ag | Steam power plant with a flame-heated steam generator and a group of gas turbines |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2840053A (en) * | 1953-01-16 | 1958-06-24 | Combustion Eng | Combustion zone control |
| GB852965A (en) * | 1956-12-24 | 1960-11-02 | Walther & Cie Ag | Improvements in steam generator plants |
| US3269368A (en) * | 1964-04-14 | 1966-08-30 | Nat Steel Corp | Superheater |
| US4003692A (en) * | 1975-08-06 | 1977-01-18 | Eclipse, Inc. | High velocity burner |
| US3989443A (en) * | 1975-10-10 | 1976-11-02 | California Portland Cement Company | Multiple fuel burner and usage in rotary kilns |
-
1986
- 1986-03-14 FR FR8603693A patent/FR2595790B1/en not_active Expired
-
1987
- 1987-03-11 US US07/024,537 patent/US4725224A/en not_active Expired - Fee Related
- 1987-03-12 DE DE8787103596T patent/DE3761707D1/en not_active Expired - Fee Related
- 1987-03-12 EP EP87103596A patent/EP0237069B1/en not_active Expired - Lifetime
- 1987-03-12 AT AT87103596T patent/ATE50354T1/en not_active IP Right Cessation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1099470A (en) * | 1953-01-16 | 1955-09-06 | Combustion Eng | Improvements made to steam generators |
| GB821423A (en) * | 1954-09-09 | 1959-10-07 | Thompson John Water Tube Boilers Ltd | Improvements relating to steam generators |
| FR1188972A (en) * | 1956-12-24 | 1959-09-28 | Walther & Cie Ag | Boiler installation allowing, as desired, heating with combustible gas or with powdery fuel or with combustible oil |
| DE1241929B (en) * | 1961-03-30 | 1967-06-08 | Steinmueller Gmbh L & C | Firing system for steam generators with two superimposed combustion chambers fired with oil and / or gas |
| DE1230512B (en) * | 1964-03-09 | 1966-12-15 | Hans Maile Fabrik Fuer Gasbren | Multi-stage gas or oil burner |
| FR1430692A (en) * | 1965-04-13 | 1966-03-04 | Nat Steel Corp | Superheater |
| US3789804A (en) * | 1972-12-14 | 1974-02-05 | Sulzer Ag | Steam power plant with a flame-heated steam generator and a group of gas turbines |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2595790B1 (en) | 1989-06-09 |
| EP0237069B1 (en) | 1990-02-07 |
| ATE50354T1 (en) | 1990-02-15 |
| FR2595790A1 (en) | 1987-09-18 |
| DE3761707D1 (en) | 1990-03-15 |
| US4725224A (en) | 1988-02-16 |
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