EP0271111A2 - Chaudière avec recyclage externe des gaz de combustion - Google Patents

Chaudière avec recyclage externe des gaz de combustion Download PDF

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Publication number
EP0271111A2
EP0271111A2 EP87118357A EP87118357A EP0271111A2 EP 0271111 A2 EP0271111 A2 EP 0271111A2 EP 87118357 A EP87118357 A EP 87118357A EP 87118357 A EP87118357 A EP 87118357A EP 0271111 A2 EP0271111 A2 EP 0271111A2
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
air
gas recirculation
recirculation line
boiler system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87118357A
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German (de)
English (en)
Other versions
EP0271111B1 (fr
EP0271111A3 (en
Inventor
Walter Dipl.-Ing. Dreizler
Ulrich Dipl.-Ing. Dreizler
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.)
Dreizler Walter
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Dreizler Walter
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6315982&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0271111(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Dreizler Walter filed Critical Dreizler Walter
Priority to AT87118357T priority Critical patent/ATE63996T1/de
Publication of EP0271111A2 publication Critical patent/EP0271111A2/fr
Publication of EP0271111A3 publication Critical patent/EP0271111A3/de
Application granted granted Critical
Publication of EP0271111B1 publication Critical patent/EP0271111B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the invention serves to reduce NO x in gas and oil-fired heating devices which are equipped with forced air burners.
  • a new type of exhaust gas recirculation is used, which enables the exhaust gas recirculation of a partial exhaust gas quantity from the boiler area back to the fan burner without additional conveying devices and thus brings about a sufficient reduction in the NO x content in the exhaust gases under previously unknown economic conditions.
  • an exhaust gas recirculation or exhaust gas recirculation in fireplaces can reduce NO x .
  • Versions are known in which an "internal" exhaust gas recirculation from the combustion chamber to the burner head takes place.
  • the injector effect of the fuel nozzle and / or the injector effect of the combustion air fed into the mixing chamber via fans serve as a "drive” for the recirculation of the flame gases.
  • the flame temperature is reduced from, for example, 1600 ° C. to 1500 ° C., which leads to a reduction in the NO x formation by 10-15%, but is still far above the desired, if possible below 50 ppm, at over 100 ppm Limit NO x is.
  • the partial pressure of the oxygen portion in the combustion, ie flame zone, which drops somewhat even with "hot" internal exhaust gas recirculation, is also not sufficient for sufficient NO x reduction.
  • Exhaust gas recirculation has also become known in large plants of power plants, in which partial exhaust gas quantities of up to 25% are fed back to the burner head of the forced-air burner via special (external) exhaust gas recirculation lines. It has shown, that the desired NO x reduction below 50 ppm is possible under these operating conditions. It proves to be disadvantageous that additional purchase and monitoring expenditure for the (or the) exhaust gas blower and constant additional operating costs for the electrical drive energy and the maintenance expenditure are required.
  • the embodiment according to the invention makes it possible to dispense with exhaust gas blowers by means of other suitable measures for promoting the partial exhaust gas quantity.
  • the exhaust gas partial quantity is returned in sufficient quantity by means of the suction effect of the combustion air blower.
  • additional operating noises are avoided which could put a strain on use in the industrial, commercial and household sectors.
  • Illustrations 1-5 show exemplary embodiments of the structure of the forced draft burner according to the invention with external exhaust gas recirculation - hereinafter also abbreviated to ARF - for the purpose of reducing the NO x to ⁇ 50 ppm.
  • the pictures show a draw-in boiler 1 with a "hot" combustion chamber 2, exhaust gas deflection 3, exhaust pipe 4 and exhaust pipe 5.
  • Each commercially available boiler of a different type, for example with 2 or 3 boiler trains, can also use the fan burner according to the invention to effectively reduce NO x operate.
  • the burner flame 7 of the forced draft burner 9 burns, which is from the ventilation housing 10 with motor 11 and combustion air blower wheel 12, the burner housing 13 with burner head 14 and fuel supply 15, as well as with solenoid valve 16, gas regulating flap 17 and other gas safety fittings, furthermore the Burner flame tube 18 is formed in its main components.
  • an air intake box 19 or alternatively an air intake port 20 is tightly attached to the inlet of the intake opening 21 of the valve housing 10.
  • the air intake box 19 - or alternatively the air intake port 20 - has a combustion air cross section 22a open upstream of the atmosphere.
  • the exemplary embodiments according to the invention shown in the pictures are boiler and fan burner designs known per se, which, as described below, are equipped with further inventive features.
  • Figure 1 shows a forced draft burner according to the invention with a continuously modulating operating mode in a view from above, the boiler in the burner and flue connection plane being drawn in section A-B.
  • the gas fan burner shows a partial section through the plane of the air intake opening 21 of the fan housing 10.
  • Figure 2 shows a side view of this gas fan burner according to the invention from the outside with a partial view of the boiler.
  • the air intake box 19 is firmly and tightly attached to the ventilation housing 10 in front of the intake opening 21; it has, at a right angle to the right of the suction opening 21, an end 22a which opens to the atmosphere and which, due to the movable air regulating flap 23a which can be adjusted with the servomotor 36, has a generally known manner in its air passage cross section, depending on the modulating burner setting can be changed.
  • the exhaust gas recirculation line (ARF line) 32a is guided from the outside through the wall 25 of the air intake box 19 and further through the air throttle disk 24a through the air throttle disk 24a, which is adjustably arranged between the air control flap 23a and the impeller 12 in front of the air intake opening 21, that the open end protrudes into the plane of the impeller 12.
  • ARF line The exhaust gas recirculation line
  • FIG. 1 shows the further design of the air throttle disk 24a, which is mounted twice on the ARF line 32a via a bracket 39 connected to it and is displaceably arranged via the threaded spindle 26 and the adjusting knob 27 in order to be able to preset the air intake opening 21.
  • the air control flap 23a is used to actually adapt the instantaneous burner setting when the modulating fan burner is operated via an electronic burner control. The simultaneous regulation of the fuel supply 15 via the composite linkage need not be discussed here.
  • the exhaust gas control flap 29 Connected to the air control flap 23a via the composite linkage 28a is the exhaust gas control flap 29, which is also installed according to the invention in the ARF line 35 upstream outside of the intake box 19 and which has the effect that the partial exhaust gas quantity is adjusted in accordance with the air flow rate associated with the modulating burner setting.
  • the flue gas control flap 29 is likewise also opened further, in order to allow a larger part of the exhaust gas to flow in in this operating position and to ensure a sufficient proportion of exhaust gas in the combustion air for the desired NO x reduction.
  • the exhaust gas control flap 29 causes via its Verbundge rods 28a with low power and low air requirement, a throttling of the partial exhaust gas quantity in order to counteract the higher delivery pressure which occurs when the air control flap 23a is closed at the open end of the ARF line 32a in the area of the impeller 12.
  • the ARF line 32a is fastened with the flange 33 to the wall 25 of the air intake box 19.
  • the exhaust gas throttle valve 30 can be adjusted by hand and installed upstream of the exhaust gas control valve 29 in the external (outer) ARF line 35. It enables the partial exhaust gas quantity to be throttled independently of the position of the exhaust gas control flap 29.
  • the ARF line 35 is routed outside the boiler 1 and opens into the exhaust pipe 5 behind the exhaust pipe 4 of the boiler 1, wherein it is fastened to the exhaust pipe with a flange 38 and opens out at an angle or alternatively in an arc shape with an open end 37 directed upstream .
  • An additional exhaust gas build-up should increase the delivery pressure.
  • the ARF line 35 is completely or partially designed in a fixed or flexible tube design.
  • the ARF line with its open end 37 can be laid through the water-carrying part of the boiler in its rear exhaust gas path, which has to be done by the boiler being tuned by the manufacturer.
  • This variant leads to even more cooled temperatures of the exhaust gas part quantity and enables a lower thermal load on the burner parts to which it is exposed.
  • Figure 3 shows a top view with a section at the center of the flue gas outlet through the boiler 1 and a partial section through the forced draft burner 9 in the plane of the air intake opening 21, another embodiment with a cylindrical air intake pipe 20, which bears close to the ventilation housing 10 in front of the intake opening 21 and the cylinder axis of which is arranged approximately in the middle of the motor and fan wheel axis and has a permanently adjustable air throttle disc 24b at its open end 22b.
  • the air control flap 23b which is required for the modulating fan burner and is driven by the servomotor 36, is attached which in turn adjusts the exhaust gas control flap 29 mounted in the ARF line 35 in the same way via the connecting linkage 28a, as already described.
  • the air throttle disk 24b arranged at the open end 22b serves to preset an ARF line 32b which is sufficient for conveying the partial exhaust gas quantity even at the open position of the air control flap 23b at the ARF line 32b which is inserted laterally in the vicinity of the fan housing 10 into the air intake pipe and is bent at right angles to the fan wheel .
  • the location for the ARF line insertion is selected in the area of the quadrant 34 not covered by the approximately 90 ° pivoting air control flap 23b.
  • the air control flap 23b and the air throttle disk 24b can also be moved closer together with their center distances if the quadrants 34 not covered by the swivel angle are selected for the "overlap" for the adjustment range.
  • the exhaust gas throttle valve 30 is installed upstream of the exhaust gas control valve 29.
  • the ARF line 32b can be inserted into the air intake pipe 20 from both directions (horizontally from the front or rear, vertically from above or below) if the axial directions of the air regulating flap 23b and the air throttle disk 24b are simultaneously also pivoted.
  • a particularly space-saving arrangement of the components within the air intake pipe 32b thus results, as already described, from the fact that the air throttle disk and the air control flap overlap in the uncovered quadrant of the swivel range and the ARF line is likewise introduced into such a quadrant 34.
  • Figure 4 shows a further embodiment of the ARF line 32b with a modulating fan burner for the arrangement in the air intake pipe 20b.
  • the fixed throttle disk 31 is used.
  • FIG. 5 shows an embodiment for the single-stage fan burner version.
  • the combustion air is preset in a shortened air tube 20c by means of the air throttle disk 24b.
  • the ARF line only has the exhaust throttle valve 30.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Treating Waste Gases (AREA)
  • Incineration Of Waste (AREA)
EP87118357A 1986-12-11 1987-12-11 Chaudière avec recyclage externe des gaz de combustion Expired - Lifetime EP0271111B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87118357T ATE63996T1 (de) 1986-12-11 1987-12-11 Heizkesselanlage mit externer abgasrueckfuehrung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3642357 1986-12-11
DE3642357 1986-12-11

Publications (3)

Publication Number Publication Date
EP0271111A2 true EP0271111A2 (fr) 1988-06-15
EP0271111A3 EP0271111A3 (en) 1988-11-30
EP0271111B1 EP0271111B1 (fr) 1991-05-29

Family

ID=6315982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87118357A Expired - Lifetime EP0271111B1 (fr) 1986-12-11 1987-12-11 Chaudière avec recyclage externe des gaz de combustion

Country Status (4)

Country Link
US (1) US4926765A (fr)
EP (1) EP0271111B1 (fr)
AT (1) ATE63996T1 (fr)
DE (1) DE3770425D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0436113A1 (fr) * 1989-12-01 1991-07-10 Asea Brown Boveri Ag Procédé pour le fonctionnement d'une installation de combustion
AT396821B (de) * 1990-03-21 1993-12-27 Vaillant Gmbh Öl- oder gas-gebläsebrenner
FR2711224A1 (fr) * 1993-10-12 1995-04-21 Guillot Ind Sa Dispositif de chauffage à recyclage partiel des gaz de combustion.
EP0791785A2 (fr) * 1996-02-23 1997-08-27 Toyota Jidosha Kabushiki Kaisha Générateur d'énergie pour la production d'un fluide chaud
ITUB20155050A1 (it) * 2015-10-19 2017-04-19 Bertelli & Partners Srl Metodo per la riduzione delle emissioni di gas novici in una caldaia a gas a camera di combustione stagna e tiraggio forzato e caldaia cosi' ottenuta

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5193995A (en) * 1987-12-21 1993-03-16 Asea Brown Boveri Ltd. Apparatus for premixing-type combustion of liquid fuel
CH680816A5 (fr) * 1989-04-27 1992-11-13 Asea Brown Boveri
JPH0628682B2 (ja) * 1989-12-16 1994-04-20 大阪富士工業株式会社 パルス燃焼式乾燥装置の熱回収システム
US5259342A (en) * 1991-09-11 1993-11-09 Mark Iv Transportation Products Corporation Method and apparatus for low NOX combustion of gaseous fuels
US5195883A (en) * 1992-04-01 1993-03-23 Aqua-Chem, Inc. Flue gas recirculation system with fresh air purge for burners
MX9404582A (es) * 1993-06-17 1995-01-31 Pvi Ind Inc Aparato calentador de agua con recirculacion pasiva de gases de lacombustion.
US5551166A (en) * 1994-03-07 1996-09-03 Astec Industries, Inc. Dryer drum coater having vented outer shell for VOC/NOx reduction
US6126440A (en) * 1996-05-09 2000-10-03 Frazier-Simplex, Inc. Synthetic air assembly for oxy-fuel fired furnaces
US6095792A (en) * 1998-08-21 2000-08-01 Texaco Inc. Flue gas recirculation system and method
EP1188930B2 (fr) * 2000-09-14 2007-06-13 PUNKER GmbH & CO. Dispositif de soufflante, particulièrement dispositif d'un ventilateur radial
US6609907B1 (en) * 2001-02-13 2003-08-26 Entropy Technology And Environmental Consultants, Lp Apparatus and method to control emissions of nitrogen oxide
DE10110810A1 (de) * 2001-03-06 2002-09-12 Siemens Building Tech Ag Anordnung eines Feuerungsautomaten für einen Gas- oder Ölbrenner
US6604474B2 (en) * 2001-05-11 2003-08-12 General Electric Company Minimization of NOx emissions and carbon loss in solid fuel combustion
FR2837263B1 (fr) * 2002-03-12 2004-09-24 Air Liquide Procede de mise en oeuvre d'une chaudiere de recuperation de chaleur
US7374735B2 (en) * 2003-06-05 2008-05-20 General Electric Company Method for nitrogen oxide reduction in flue gas
US6776609B1 (en) * 2003-06-26 2004-08-17 Alzeta Corporation Apparatus and method of operation for burners that use flue gas recirculation (FGR)
US7425127B2 (en) * 2004-06-10 2008-09-16 Georgia Tech Research Corporation Stagnation point reverse flow combustor
KR100788267B1 (ko) * 2005-08-01 2007-12-27 고일영 재생 폴리에틸렌 용융기의 배출가스 연소장치
US8083517B2 (en) * 2008-03-28 2011-12-27 Fives North American Combustion, Inc. Method of operating a furnace
WO2011047068A1 (fr) * 2009-10-14 2011-04-21 Reklaim, Inc. Procédé et produits de pyrolyse
DE102010051806A1 (de) * 2010-11-18 2012-05-24 Linde Aktiengesellschaft Brenner mit einstellbarer Rauchgasrezirkulation
WO2020065378A1 (fr) * 2018-09-27 2020-04-02 C.I.B. Unigas S.P.A. Mélangeur pour brûleurs de recirculation de fumées d'échappement

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FR1587944A (fr) 1967-10-16 1970-04-03
DE2365186A1 (de) 1973-12-29 1975-07-10 Elco Oelbrennerwerk Ag Verfahren und vorrichtung zum russfreien verbrennen von fluessigen brennstoffen

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FR1587944A (fr) 1967-10-16 1970-04-03
DE2365186A1 (de) 1973-12-29 1975-07-10 Elco Oelbrennerwerk Ag Verfahren und vorrichtung zum russfreien verbrennen von fluessigen brennstoffen

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0436113A1 (fr) * 1989-12-01 1991-07-10 Asea Brown Boveri Ag Procédé pour le fonctionnement d'une installation de combustion
CH680157A5 (fr) * 1989-12-01 1992-06-30 Asea Brown Boveri
US5147200A (en) * 1989-12-01 1992-09-15 Asea Brown Boveri, Ltd. Method of operating a firing installation
AT396821B (de) * 1990-03-21 1993-12-27 Vaillant Gmbh Öl- oder gas-gebläsebrenner
FR2711224A1 (fr) * 1993-10-12 1995-04-21 Guillot Ind Sa Dispositif de chauffage à recyclage partiel des gaz de combustion.
EP0791785A2 (fr) * 1996-02-23 1997-08-27 Toyota Jidosha Kabushiki Kaisha Générateur d'énergie pour la production d'un fluide chaud
EP0791785A3 (fr) * 1996-02-23 1998-11-18 Toyota Jidosha Kabushiki Kaisha Générateur d'énergie pour la production d'un fluide chaud
ITUB20155050A1 (it) * 2015-10-19 2017-04-19 Bertelli & Partners Srl Metodo per la riduzione delle emissioni di gas novici in una caldaia a gas a camera di combustione stagna e tiraggio forzato e caldaia cosi' ottenuta
WO2017068407A1 (fr) * 2015-10-19 2017-04-27 Bertelli & Partners S.R.L. Procédé de réduction d'émissions de gaz nocifs d'une chaudière à circulation forcée à chambre de combustion scellée à gaz utilisant une recirculation de gaz de combustion, et chaudière correspondante
EA036581B1 (ru) * 2015-10-19 2020-11-26 Бертелли Энд Партнерс С.Р.Л. Способ снижения выбросов вредных газов из котла, работающего на газообразном топливе и имеющего уплотненную камеру сгорания с принудительной тягой, и котел, получаемый таким способом
US10851991B2 (en) 2015-10-19 2020-12-01 Bertelli & Partners S.R.L. Method for reducing harmful gas emissions from a gas-fired sealed combustion chamber forced-draught boiler and boiler so obtained

Also Published As

Publication number Publication date
DE3770425D1 (de) 1991-07-04
ATE63996T1 (de) 1991-06-15
EP0271111B1 (fr) 1991-05-29
EP0271111A3 (en) 1988-11-30
US4926765A (en) 1990-05-22

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