EP3734154A1 - Tête de brûleur à recirculation interne - Google Patents

Tête de brûleur à recirculation interne Download PDF

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Publication number
EP3734154A1
EP3734154A1 EP20165995.0A EP20165995A EP3734154A1 EP 3734154 A1 EP3734154 A1 EP 3734154A1 EP 20165995 A EP20165995 A EP 20165995A EP 3734154 A1 EP3734154 A1 EP 3734154A1
Authority
EP
European Patent Office
Prior art keywords
primary
supply gas
combustion head
internal
flame
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.)
Pending
Application number
EP20165995.0A
Other languages
German (de)
English (en)
Inventor
Stefano PESCE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Quanjie Envir Co Ltd
Original Assignee
Shanghai Quanjie Envir Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shanghai Quanjie Envir Co Ltd filed Critical Shanghai Quanjie Envir Co Ltd
Publication of EP3734154A1 publication Critical patent/EP3734154A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • 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
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/006—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F23D14/70—Baffles or like flow-disturbing devices
    • 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 
    • F23C2202/00—Fluegas recirculation
    • F23C2202/30—Premixing fluegas with combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14641—Special features of gas burners with gas distribution manifolds or bars provided with a plurality of nozzles

Definitions

  • the present invention relates to a combustion head with internal recirculation for a burner and a burner comprising such a combustion head.
  • the reduction or lowering of the NOx in industrial burners has always been a desirable objective.
  • a lowering of the NOx has been achieved in the past by using a lean primary air/gas mixture connected with a distribution of the gaseous fuel in stages.
  • the lean primary fuel mixture is potentially desirable in some applications because the air in excess produces a charge for reducing the flame temperature in order to reduce the NOx.
  • the gas can then be introduced into the combustion zone either by means of jets which are arranged around the periphery of the burner or by a central jet which protrudes through the final portion of the central gas tube.
  • the secondary fuel is burnt with the air in excess in an environment in which the combustion fumes are present and act as a dilution. This technology has not always been capable of ensuring the levels of NOx desired or prescribed by the current laws.
  • a lean primary mixture is introduced through the combustion chamber at a relatively high velocity as a result of the extra mass of air in excess. This velocity can sometimes be so high that it exceeds the flame velocity, causing an unstable flame situation. When the flame becomes unstable, it is no longer possible to continue.
  • the document DE 3811477 A1 describes a gas burner in which an air/gas mixture is supplied at the inlet end of a combustion chamber through various mixing tubes.
  • the gas is directed into the inlet ends of the mixing tubes by respective jets so that the air is drawn by the gas.
  • the inlet ends of the inlet tubes are in different planes, for example, with the mixing tubes directed radially with respect to the burner chamber.
  • a scope of the present invention is to provide a combustion head with internal recirculation for a burner or a burner comprising the above-mentioned combustion head which is structurally and functionally configured to at least partially overcome at least one of the disadvantages of the cited prior art.
  • an object is to improve the operation of the combustion head (or the burner or the boiler associated therewith), ensuring high performance levels.
  • This object is at least partially achieved as a result of a combustion head with internal recirculation for a burner of a combustion chamber comprising
  • the term "diffuser element” indicates an element which performs the function of generating a turbulence and mixing between primary air and primary gas.
  • this diffuser element is a disc or an element of a different shape with or without holes or a turbine element which comprises blades which provide a rotation for the central flow of air.
  • the casing, the first pipe comprising the primary jet, the collector and the diffuser element are formed or arranged so as to be able to generate the primary flame downstream of the diffuser element, thereby producing primary internal exhaust gas
  • the casing, the first pipe comprising the secondary jet and the nozzle being formed or arranged so as to be able to generate the secondary flame downstream of the nozzle, thereby producing secondary internal exhaust gas.
  • the combustion head comprises
  • combustion head which is capable of producing a reduced-pressure zone which is positioned upstream of, at or downstream of the primary flame or the diffuser element with respect to a value of the greater pressure present in the combustion chamber.
  • this technical solution can also be carried out upstream of, at or downstream of the secondary flame.
  • the production of the pressure difference is brought about by means of detachment of the air vein from a specific surface.
  • this surface is identified as the first, second or third interference surface with respect to the first and/or second primary or secondary supply gas.
  • this reduced pressure does not form as a result of a phenomenon based on the Venturi effect, but instead on the turbulence (and therefore pressure reduction associated therewith) produced as a result of a specific interference surface which is inserted inside a flow.
  • the term "burner” is intended to be understood to refer to the whole comprising a ventilation fan, a combustion head and the electronic system dedicated thereto. This condition therefore allows an induced effective recirculation of the internal fumes to be carried out (and in particular of the non-depleted internal fumes), thereby allowing an increase in the lowering of the NOx fumes.
  • the second primary supply gas and/or the second secondary supply gas is/are air.
  • This condition is advantageously effective in producing desired gaseous combustion mixtures and thus in the resultant operation of the combustion head itself.
  • the first pipe coincides with the longitudinal axis and is connected in fluid-dynamic terms to at least a second pipe which is radially spaced apart from the first pipe and which has a main extent which is substantially parallel therewith.
  • the combustion head comprises four second pipes which are circularly equidistant from each other, that is to say, which are positioned with spacing from each other over a circumference.
  • the first interference surface with respect to the first and/or second primary supply gas is a radially external surface which is proximal to the first recirculation chamber or the second interference surface is the radially internal surface of the first recirculation chamber.
  • this second interference surface is contained in a cylindrical main body which is coaxial with the combustion head which further includes a plurality of through-pipes which project radially from the main body until intersecting with the nozzle.
  • the first or second interference surface is inclined substantially at a first angle which is equal to approximately 90° with respect to the longitudinal axis. It is thereby possible to obtain an efficient detachment of the fluid vein, thereby producing a desired reduced pressure downstream of the first or second or third interference surface.
  • the first recirculation chamber comprises
  • the combustion head comprises four first recirculation chambers which are equidistant from each other.
  • first recirculation chambers therefore produce or identify a sort of plurality of cylindrical sectors which are arranged substantially around a circumference and radially spaced apart from the longitudinal axis.
  • the Applicant has found that the number equal to four first recirculation chambers corresponds to an ideal compromise solution between the space occupied by the chambers themselves and the space left free for the passage of other gaseous fluids and/or for simpler access to mechanical components for the purposes of maintenance or replacement.
  • the second recirculation chamber comprises
  • a recirculation chamber which has a single central body which is aligned with the longitudinal axis and which comprises only projecting portions which are capable of intersecting with the nozzle, thereby defining the course which can be travelled by the recirculation exhaust gases (primary and/or secondary).
  • the plurality of arms is equal to four.
  • the first primary internal recirculation chamber comprises a first aperture which is positioned in fluid-dynamic terms upstream of the first interference surface and a choke plate which is secured to the first primary internal recirculation chamber with permitted translation movement with respect to the first aperture.
  • the second primary internal recirculation chamber comprises a second aperture which is positioned in fluid-dynamic terms upstream of the second interference surface and a choke disc which is secured to the second primary internal recirculation chamber with permitted rotation with respect to the second aperture.
  • the combustion head comprises a movable cylindrical band which is positioned to be coaxial with the outer surface of the nozzle and which is secured thereto with permitted translation movement in order to close or choke the second entry aperture of the secondary internal recirculation chamber.
  • This technical solution can also Preferably be translated or replicated in the region of the apertures in the nozzle which identify the intersection between it and the first recirculation chamber.
  • a combustion head with internal recirculation for a burner 100 of a combustion chamber 26 comprising - a casing 1' which at least partially projects towards the inner side of the combustion chamber 26 and which has a main extent which is substantially cylindrical about a longitudinal axis L.
  • the combustion head 1 is constructed from a ceramic or metal material, preferably from steel which is further preferably austenitic.
  • the combustion head 1 is applied to a combustion chamber 26 which already exists. Should it be necessary, it is possible to dimension a hole of the combustion chamber 26 so as to be able to at least partially receive the combustion head 1 in a simple and efficient manner inside the combustion chamber 26.
  • a second nozzle 23 which is radially distal with respect to the nozzle 8 and which is formed so as to be inserted inside the hole of the combustion chamber, defining the necessary fluid paths for recirculation exhaust gas.
  • the casing 1' has a prismatic form with a hexagonal, octagonal base and the like.
  • the combustion head 1 comprises
  • the diffuser element 7 is preferably constructed from austenitic steel, comprising a central body which has a substantially circular form or which has circular symmetry with predefined recesses, and from which a portion which is also circular and preferably inclined with respect to the longitudinal axis L Preferably extends.
  • the combustion head 1 comprises - the casing 1', the first pipe 20 comprising the primary jet 6a, 6a', the collector 5 and the diffuser element 7 which are formed or arranged so as to be able to generate the primary flame 17 downstream of the diffuser element 7, thereby producing primary internal exhaust gas I1, - the casing 1', the first pipe 20 comprising the secondary jet 6b and the nozzle 8 which are formed or arranged so as to be able to generate the secondary flame 18 downstream of the nozzle 8, thereby producing secondary internal exhaust gas 12.
  • the first pipe 20 is a steel tube having a dimeter between 25 and 35 mm, preferably equal to 30 mm for a combustion head for a power to be supplied similar to 2500 kW.
  • a construction type will have dimensions which are proportionally greater in accordance with the power used.
  • the primary jet 6a and 6a' are dedicated jets which are optimized for the introduction of the first primary supply gas 11' of the primary flame 17 while the secondary jet 6b is dedicated and optimized for the introduction of the first secondary supply gas 12' of the secondary flame 18.
  • These primary jets 6a; 6a' and secondary jets 6b are preferably formed in a cylindrical manner with a through-hole along the axis of the cylinder or in the wall of the cylinder in order to ensure a directional ejection of the first primary and secondary supply gas.
  • the combustion head 1 comprises
  • the primary and secondary internal exhaust gas I1, I2 can be mixed or mixed with each other and can be re-introduced by means of the first or second primary internal recirculation chamber 9a, 9b and/or the secondary internal recirculation chamber 10.
  • these primary and secondary internal exhaust gases I1, I2 can be simply identified when they are produced as exhaust emissions by the primary and secondary flames, respectively. It is advantageous to note that this composition of the exhaust gas is not intended to be maintained in a necessarily constant manner, in fact the purpose itself of the internal recirculation of these fumes is to lower or reduce significantly the content thereof in terms of NOx in order to make the combustion process cleaner and more efficient.
  • the primary and secondary exhaust gas I1, I2 can be re-mixed with each other, then defining, during the subsequent flame combustion step, new primary and secondary exhaust gas I1, I2.
  • first, second and third interference surfaces X1a, X1b, X3 are arranged so as to generate a deviation (preferably abrupt) in the direction of the flow of the second primary supply gas 14 and/or the second secondary supply gas 15 (preferably air), and a loss of pressure of the flow itself so as to generate a pressure difference which is sufficient to mobilize a flow from the outer side to the inner side of the combustion head 26, passing through the first entry aperture 31a and/or the second entry aperture 32a.
  • a component of those interference surfaces is Preferably arranged transversely or perpendicularly with respect to the main longitudinal direction of advance of the air flow (substantially parallel with the longitudinal axis L).
  • the Applicant has found that it is possible to obtain this deviation of the flow by means of a surface which has at least one axis perpendicular to the longitudinal axis L.
  • this plane can have both the constituent axes perpendicular to the longitudinal axis L, or only one of them then being transverse with respect to the above-mentioned longitudinal axis in a vertical or horizontal direction.
  • the ratio between the air passage surface (that is to say, the second primary supply gas 14 and/or the second secondary supply gas 15, the fluid passing through these portions of pipes or chambers) and the total cross-section of the nozzle is typically above 40%, also being up to 65% for combustion heads with a low charge loss (cf. Figure 9a ).
  • the passage surface of the second primary supply gas 14 and/or the second secondary supply gas 15 is shown in Figures 9a and 9b with solid parallel lines.
  • the ratio between the passage surface of the air and the total cross-section of the nozzle preferably involves values approximately between 12% and 30%. More preferably, the ratio between the surfaces of the first outlet aperture 31b and the second outlet aperture 32b of the primary and secondary exhaust gas I1, I2 (which correspond to the projection onto the plane perpendicular to the longitudinal flow L) and the total cross-section of the nozzle (8) is between values between 30% and 45% (cf. Figure 9b ).
  • the second primary supply gas 14 and/or the second secondary supply gas 15 is/are air.
  • this type of gas comprises oxygen.
  • the first nozzle 8 has a substantially cylindrical extent.
  • first nozzle 8 there are defined in the first nozzle 8 the first entry aperture 31a of the first or second primary internal recirculation chamber 9a; 9b and the second entry aperture 32a of the secondary internal recirculation chamber 10.
  • the first pipe 20 coincides with the longitudinal axis L and is connected in fluid-dynamic terms to at least one second pipe 21 which is radially spaced apart from the first pipe 20 and which has a main extent which is substantially parallel therewith.
  • the combustion head 1 comprises four second pipes 21 which are circularly equidistant from each other.
  • the first pipe 20 is connected upstream of the combustion head 1 by means of an entry tube 19.
  • the first interference surface X1a with the first and/or second primary supply gas 11', 14 is a radially external surface which is proximal relative to the first recirculation chamber 9a.
  • the second interference surface X1b is the radially internal surface of the first recirculation chamber 9b.
  • this second interference surface X1b is contained in a main body 60 which is substantially cylindrical and which is coaxial relative to the combustion head 1, further including a plurality of transverse pipes 61 which project radially from the main body until intersecting with the nozzle 8.
  • the first or second or third interference surface X1a; X1b, X3 is inclined through a first angle ⁇ 1 equal to approximately 90° with respect to the longitudinal axis L.
  • the first recirculation chamber 9a comprises
  • the combustion head 1 comprises four first recirculation chambers 9a which are equidistant from each other.
  • the second recirculation chamber 9b comprises
  • the first primary internal recirculation chamber 9a comprises a first aperture 16a which is positioned in fluid-dynamic terms upstream of the first interference surface X1a and a choke plate 34a which is secured to the first primary internal recirculation chamber 9a with permitted translation movement with respect to the first aperture 16a.
  • the choke plate 34a is secured, for example, by means of screws which allow it to be fixed in a secure manner to the first recirculation chamber 9a and allow it to be moved reversibly as desired or as required.
  • the first aperture has a substantially rectangular form and is positioned on a rear surface which is substantially perpendicular or transverse to the longitudinal axis L.
  • the second primary internal recirculation chamber 9b comprises a second aperture 16b which is positioned in fluid-dynamic terms upstream of the second interference surface X1b and a choke disc 34b which is secured to the second primary internal recirculation chamber 9b with permitted rotation with respect to the second aperture 16b.
  • the choke disc 34b is secured, for example, by means of screws which allow it to be fixed in a secure manner to the second recirculation chamber 9b and allow it to be moved reversibly as desired or as required.
  • the second aperture 16b has a shape similar to a circular sector or segment and is positioned on a rear surface which is substantially perpendicular or transverse to the longitudinal axis L.
  • the first aperture 16a can be constructed in the second primary internal recirculation chamber 9b and the second aperture 16b can be constructed in the first primary internal recirculation chamber 9a.
  • the combustion head 1 comprises a movable cylindrical band 30 which is positioned to be coaxial with the external surface of the nozzle 8 and secured thereto with permitted translation movement in order to close or choke the second entry aperture 32a of the secondary internal recirculation chamber 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
EP20165995.0A 2019-04-29 2020-03-26 Tête de brûleur à recirculation interne Pending EP3734154A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000006424A IT201900006424A1 (it) 2019-04-29 2019-04-29 Testa di combustione con ricircolazione interna e bruciatore comprendente la stessa

Publications (1)

Publication Number Publication Date
EP3734154A1 true EP3734154A1 (fr) 2020-11-04

Family

ID=67875906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20165995.0A Pending EP3734154A1 (fr) 2019-04-29 2020-03-26 Tête de brûleur à recirculation interne

Country Status (3)

Country Link
EP (1) EP3734154A1 (fr)
CN (1) CN111853775A (fr)
IT (1) IT201900006424A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114636152A (zh) * 2020-12-15 2022-06-17 杭州鸿和能源环境科技有限公司 一种多级内燃式低氮燃烧器
IT202100023477A1 (it) 2021-09-10 2023-03-10 Shanghai Quanjie Envir Equip Co Ltd Testa di combustione con ricircolazione interna e bruciatore comprendente la stessa
WO2024057081A1 (fr) * 2022-09-13 2024-03-21 C.I.B. Unigas S.P.A. Appareil d'extrémité comprenant une tête de combustion progressive pour faibles émissions de nox et brûleur comprenant cet appareil d'extrémité
EP4365490A2 (fr) 2022-09-13 2024-05-08 C.I.B. Unigas S.p.A. Appareil d'extrémité comprenant une tête de combustion progressive pour faibles émissions de nox et brûleur comprenant cet appareil d'extrémité

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3811477A1 (de) 1987-04-15 1988-10-27 Vaillant Joh Gmbh & Co Atmosphaerischer gasbrenner
EP0386732A2 (fr) * 1989-03-10 1990-09-12 Oertli Wärmetechnik Ag Dispositif de combustion pour brûleur à deux combustibles
EP0857915A2 (fr) * 1997-02-07 1998-08-12 ELCO KLÖCKNER HEIZTECHNIK GmbH Procédé et tête de brûleur pour la combustion des combustibles liquides ou gazeux
WO2017209503A1 (fr) * 2016-06-03 2017-12-07 한국생산기술연구원 Appareil à combustion à très faible teneur en oxyde d'azote

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023921A (en) * 1975-11-24 1977-05-17 Electric Power Research Institute Oil burner for NOx emission control
US5284438A (en) * 1992-01-07 1994-02-08 Koch Engineering Company, Inc. Multiple purpose burner process and apparatus
US5460512A (en) * 1993-05-27 1995-10-24 Coen Company, Inc. Vibration-resistant low NOx burner
DE4328130A1 (de) * 1993-08-20 1995-02-23 Saacke Gmbh & Co Kg Verfahren und Vorrichtung zum emissionsarmen Verbrennen von fließfähigen und/oder gasförmigen Brennstoffen mit interner Rauchgasrezirkulation
FR2766557B1 (fr) * 1997-07-22 1999-10-22 Pillard Chauffage Bruleurs a combustible liquide et gazeux a faible emission d'oxydes d'azote
US6663380B2 (en) * 2001-09-05 2003-12-16 Gas Technology Institute Method and apparatus for advanced staged combustion utilizing forced internal recirculation
EP1714074B1 (fr) * 2004-02-13 2012-04-18 Elster GmbH Procede de fonctionnement d'un bruleur, et bruleur pour combustibles liquides et/ou gazeux

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3811477A1 (de) 1987-04-15 1988-10-27 Vaillant Joh Gmbh & Co Atmosphaerischer gasbrenner
EP0386732A2 (fr) * 1989-03-10 1990-09-12 Oertli Wärmetechnik Ag Dispositif de combustion pour brûleur à deux combustibles
EP0857915A2 (fr) * 1997-02-07 1998-08-12 ELCO KLÖCKNER HEIZTECHNIK GmbH Procédé et tête de brûleur pour la combustion des combustibles liquides ou gazeux
WO2017209503A1 (fr) * 2016-06-03 2017-12-07 한국생산기술연구원 Appareil à combustion à très faible teneur en oxyde d'azote

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114636152A (zh) * 2020-12-15 2022-06-17 杭州鸿和能源环境科技有限公司 一种多级内燃式低氮燃烧器
IT202100023477A1 (it) 2021-09-10 2023-03-10 Shanghai Quanjie Envir Equip Co Ltd Testa di combustione con ricircolazione interna e bruciatore comprendente la stessa
WO2024057081A1 (fr) * 2022-09-13 2024-03-21 C.I.B. Unigas S.P.A. Appareil d'extrémité comprenant une tête de combustion progressive pour faibles émissions de nox et brûleur comprenant cet appareil d'extrémité
EP4365490A2 (fr) 2022-09-13 2024-05-08 C.I.B. Unigas S.p.A. Appareil d'extrémité comprenant une tête de combustion progressive pour faibles émissions de nox et brûleur comprenant cet appareil d'extrémité

Also Published As

Publication number Publication date
CN111853775A (zh) 2020-10-30
IT201900006424A1 (it) 2020-10-29

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