EP0062228B1 - Brenner für die Verbrennung mehrerer Brennstoffe - Google Patents

Brenner für die Verbrennung mehrerer Brennstoffe Download PDF

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Publication number
EP0062228B1
EP0062228B1 EP19820102393 EP82102393A EP0062228B1 EP 0062228 B1 EP0062228 B1 EP 0062228B1 EP 19820102393 EP19820102393 EP 19820102393 EP 82102393 A EP82102393 A EP 82102393A EP 0062228 B1 EP0062228 B1 EP 0062228B1
Authority
EP
European Patent Office
Prior art keywords
tube
burner
air
duct
combustion
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.)
Expired
Application number
EP19820102393
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0062228A1 (de
Inventor
Edward Campobenedetto
Stephen Johnson
Herbert Schuster
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.)
Deutsche Babcock Werke AG
Babcock and Wilcox Co
Original Assignee
Deutsche Babcock Werke AG
Babcock and Wilcox Co
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 Deutsche Babcock Werke AG, Babcock and Wilcox Co filed Critical Deutsche Babcock Werke AG
Publication of EP0062228A1 publication Critical patent/EP0062228A1/de
Application granted granted Critical
Publication of EP0062228B1 publication Critical patent/EP0062228B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D17/00—Burners for combustion simultaneously or alternately of gaseous or liquid or pulverulent fuel
    • F23D17/007—Burners for combustion simultaneously or alternately of gaseous or liquid or pulverulent fuel liquid or pulverulent fuel

Definitions

  • the invention relates to a burner with a burner opening which is arranged in the wall of a combustion chamber and with a burner wall which is arranged at a distance from the combustion chamber wall, an air box being formed between the combustion chamber wall and the burner wall, in which a first tube is at least partially is arranged, the outlet end of which is provided at the burner opening, a first and a second guide body being arranged concentrically to form an inner and an outer ring channel within the air box, which have mutually separate flaps and a number of swirl blades are arranged in the inner ring channel and a coal dust and air-carrying dust duct is connected to the burner.
  • CH-A-429 002 describes a burner for the combustion of several fuels.
  • This burner has several concentrically arranged tubes, between which ring channels are formed. Combustion air and different fuels are fed to the ring ducts and the central duct in such a way that three burner systems are formed, each having its own fuel duct with a single combustion air duct. With this burner, the combustion air is supplied in one stage based on each individual fuel. This known burner can therefore burn several fuels, but this combustion is not such that the formation of nitrogen oxides can be suppressed.
  • the invention has for its object to design the burner mentioned in such a way that several fuels can be burned individually or in combination with the same burner while reducing the formation of nitrogen oxides.
  • a second tube is arranged concentrically between the first tube and the first guide body, that at least and the outlet end of the second tube is arranged at the burner opening, that the inlet end of the second tube with the Coal dust and air-guiding dust duct is connected, that an air-guiding duct is provided between the air box and the inlet end of the first pipe and that the first pipe with 5 to 10%, the second pipe with 15 to 30%, the inner ring channel with 22 to 35 the stoichiometric amount of air and the outer ring channel is acted upon by the remaining amount of air required for complete combustion.
  • This burner is constructed in such a way that a solid fuel can be passed through the second tube and a liquid or solid further fuel can be passed through the first tube.
  • These fuels are first burned under reducing conditions, which suppresses the formation of nitrogen oxides from the nitrogen in the fuel.
  • a low flame temperature is created, through which the formation of stickowids from the nitrogen in the air is kept low.
  • the remaining air necessary for complete combustion is fed through four separately controlled channels so that it surrounds the reducing zone and ultimately causes a mixture with the fuel to complete its combustion.
  • FIG. 1 shows a steam generator 10 with water-cooled walls 12 which delimit a combustion chamber or a combustion chamber 14, into which a mixture of carbon-containing fuel and / or coal dust and air is fed through a burner 16 which is suitable for the combustion of several fuels.
  • the heated gases flow upward around a lug 18 of the combustor, through the tubular secondary superheater 20, and then down through the touch train 22, which includes the tubular primary superheater 24 and the feedwater preheater 26.
  • the gases emerging from the touch train 22 flow through pipes of an air preheater 28, then exit through a flue gas duct 30 and are then blown off into the open by means not shown.
  • a fresh fan 32 provides combustion air to the steam generator and presses it over the air preheater tubes, around a plurality of baffles 34 and then through a channel 36 for division between the branch channels 38 and 40.
  • the preheated air flowing through the channel 38 is conveyed into an air box 42 and represents the greater part of the air which is required for the combustion of the fuel conveyed into the burner opening 50.
  • the preheated air flowing through duct 40 is the carrier air and the remainder of the air needed for combustion; it passes into a primary blower 52, in which its pressure is increased, and is then conveyed through a channel 54 into a ventilated mill 56.
  • the coal dust to be fired as the primary fuel in the steam generator 10 is conveyed in raw form via the pipe 58 from the raw coal storage bunker 60 to a mill feeder 62 in a manner known per se, depending on the load requirement of the steam generator 10.
  • the mill 56 grinds the coal coal to the desired particle size, the compressed air conveyed by the primary air blower 52 flows through the mill and takes the ground coal particles with it to flow through a dust channel 64 and enter the combustion chamber 14 through the burner opening 50.
  • the liquid secondary fuel to be fired in the steam generator 10 is conveyed in a manner known per se via a pump system (not shown) to the liquid fuel burner 79 in a channel which is independent of the central combustion air. Part of the combustion air is conveyed through the guide channel 65 via the blower 53 to the first pipe 82 and then to the burner opening 50.
  • a solid secondary fuel If a solid secondary fuel is used, it is conveyed to the secondary solid fuel mixing chamber 83 through the channel 81 in a manner known per se.
  • the combustion air is used as carrier air for the solid fuel. Part of the combustion air is conveyed through the guide channel 65 to the fan 53. After exiting the fan 53, the combustion air flows through the guide channel 71 to the secondary solid fuel mixing chamber 83, after which the solid fuel and the air flow through the first pipe 82 to the burner opening 50.
  • the blower 53 is only in operation when solid secondary fuel is being burned.
  • a flap 66 belongs to the fresh fan 32 to regulate the amount of air that is conveyed to the steam generator 10 depending on the load requirement.
  • a flap 68 is associated with the primary air blower 52 to control the amount of air that is introduced into the mill 56.
  • a flap 6,7 is associated with the blower 53 to regulate the amount of combustion air that is fed into the first pipe 82.
  • only one burner 16 is shown in FIG. 1. Of course, several such burners can also be used for a steam generator.
  • Fig. 2 shows the burner 16, which is arranged so that it burns through the burner opening 50, the latter being designed as a truncated cone-shaped throat which diverges to the combustion chamber side of the wall 12 and is cooled by pipes 90.
  • An outer burner wall 84 which has a passage opening 86, is arranged at a distance from the combustion chamber wall 12.
  • the air box 42 forms the space between the burner and combustion chamber walls.
  • the multiple fuel burner includes a first tube 82 which defines a central channel 94 and extends through a dust channel 64 and through a cover plate 88 and the air box 42 to a point close to the burner opening 50.
  • the liquid fuel burner 79 is arranged coaxially within the first tube 82 and connected to feed lines (not shown) for the liquid fuel and the atomizing medium.
  • the inlet of the first tube 82 is connected to the secondary fuel mixing chamber 83 in terms of flow technology.
  • This mixing chamber 83 is fluidly connected to the guide channel 71, which in turn is connected to the blower 53 and the guide channel 65, which comes from the air box 42.
  • the mixing chamber 83 is also connected in terms of flow technology to the duct 81 through which the solid secondary fuel is supplied.
  • a flap 67 controls the amount and speed of the combustion air flowing through the first tube 82 and is used to influence the shape of the flame and the mixing pattern of the fuel and air in the combustion chamber 14.
  • a second tube 80 which is arranged concentrically around the first tube 82, delimits a central annular channel 98 and runs through the cover plate 88 and the air box 42 to a point close to the burner opening 50.
  • the inlet of the second tube 80 is fluidically connected to the Guide channel 64 connected, which conveys coal dust and part of the combustion air from the mill 56.
  • An optional carbon diffuser 134 is arranged in the central ring channel 98.
  • a first and a second guide body 102 and 108 are disposed within the air box 42 to direct combustion air to the throat formed within the burner opening 50.
  • the first guide body 102 has a part 102 A, which is arranged concentrically and at a distance around the outlet of the second tube 80 in order to form an inner annular channel 72 therebetween.
  • the remaining part of the guide body 102 has the shape of a flange plate 102 B, which extends laterally outwards from the entry end of the part 102 A.
  • An annular wall or back plate 104 surrounds and is connected to the second tube 80.
  • the plates 104 and 102 B are arranged at a distance from one another in order to form the entry 72 A into the inner annular channel 72, which runs perpendicularly thereto.
  • the inner circumference of the ring plate 104 is also connected to a sleeve-like part 106 which runs along a piece of the outlet part of the second tube 80 and closely surrounds the same.
  • the second guide body 108 has a part 108 A, which runs concentrically and at a distance around the outlet end of the part 102 A of the guide body 102 in order to form an outer annular channel 74 therebetween.
  • the remaining part of the guide body 108 is in the form of a flange plate 108 B which extends laterally outward from the entry end of the part 108 A.
  • An annular wall plate 110 surrounds the part 102 A of the guide body 102 and is connected thereto.
  • the plates 108 B and 110 are arranged at a distance from one another in order to form the entry 74 A into the outer ring channel 74, which runs perpendicularly thereto.
  • a number of flaps 112 is arranged within the inlet 72 A to the annular channel 72 on the circumference and at an equal distance and is articulated between and on the outer circumference of the plates 102 collar 104.
  • the flaps 112 are arranged to rotate between the open, closed and intermediate positions; they are preferably connected to one another via a linkage 114 in order to be adjustable jointly and simultaneously via a shaft 116 which is connected for actuation to it, ends outside of the air box 42 and is connected to a manually operated handle 118.
  • a number of flaps 120 is arranged inside the entrance 74 A to the annular channel 74 on the circumference and at an equal distance and is articulated between and on the outer circumference of the plates 108 B and 110.
  • the flaps 120 are arranged to rotate between the open, closed and intermediate positions; preferably they are connected to one another via a linkage 122 in order to be jointly and simultaneously settable via a shaft 124 which is connected to it for actuation, ends outside the air box 42 and is connected to the manually operated handle 126.
  • shafts 116, 124 and 130 can be suitably geared or otherwise connected to an actuator, not shown, which would respond to automatic control.
  • An igniter 136 in a known design extends through the cover plate 88 and through the back plate 104 to end at the exit end of the inner ring channel 72.
  • the igniter 136 may be placed in the central channel 94 in place of the liquid fuel burner 79.
  • An observation tube 138 extends through the cover plate 88 and the back plate 104 to end close to the inside of the back plate 104.
  • Fig. 3 shows a section of the air box side of the cover plate 88, including the flange plate 108 B with joints 120 A, which run through the plate for the flaps 120.
  • the guide body parts 108 A and 102 A cooperate to form the outer ring channel 74 between them, while the second tube 80 and the guide body part 102 A cooperate to form the inner ring channel 72 between them.
  • the inner ring channel 72 receives the swirl blades 128.
  • the second tube 80 and the first tube 82 delimit the outlet part of the middle ring channel 98.
  • the optional carbon diffuser 134 is arranged in the middle ring channel 98.
  • the first pipe 82 delimits the outlet part of the central channel 94.
  • the optional liquid fuel burner 79 is arranged within the central channel 94.
  • the liquid fuel to be fired in the combustion chamber 14 is supplied via feed lines, not shown, atomized within the burner 16 and sprayed into the burner opening 50.
  • the solid secondary fuel to be fired in the combustion chamber 14 is supplied via a duct 81 from a storage bunker (not shown), the air from the duct 71 being used to convey the solid fuel into the burner opening 50.
  • the amount of air supplied is regulated by a flap 67 in order to provide enough air for the transport of the secondary fuel.
  • the coal to be fired in the combustion chamber 14 is supplied in raw form via the pipe 58 from the raw coal storage bunker 60 to the mill feeder 62, which supplies the quantity of coal supplied to the mill 56 in a manner known per se depending on the load requirement of the steam generator 10 regulates.
  • the mill 56 which is in the ventilated version, is supplied with combustion and transport compressed air from a primary air blower 52, the amount of air supplied being regulated by a flap 68 to provide enough air to initiate ignition at the burner outlet and to provide a sufficient flow rate to ensure thorough ventilation of the mill 56, the dust channel 64 and the central ring channel 98.
  • the air required for the combustion is supplied to the steam generator through a fresh fan 32 which includes a flap 66 which controls the amount of air depending on the Controls the load requirement of the steam generator 10 in a manner known per se.
  • the combustion air is preheated when it comes into indirect contact with the flue gases flowing through the tubes of an air preheater 28 and is then passed through a duct 36 to be split between branch ducts 40 and 38.
  • the first-mentioned branch duct leads to the mill 56, as described above, while the latter branch duct leads to the air box 42, where the air is divided between the middle duct 94 via the guide ducts 65 and 71 and between the inner ring duct 72 and the outer ring duct 74 becomes.
  • combustion air flowing through the central duct 94 is kept within a range of 5 to 10% of the stoichiometric air that passes through combustion air flowing through the central ring channel 98 within a range of 15 to 30% of the stoichiometric air and combustion air flowing through the inner ring channel 72 within a range of 22 to 35% of the stoichiometric air.
  • the combustion air flowing through the outer ring channel 74 represents the air that is required to complete the combustion of the fuel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
EP19820102393 1981-04-08 1982-03-23 Brenner für die Verbrennung mehrerer Brennstoffe Expired EP0062228B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25183781A 1981-04-08 1981-04-08
US251837 1981-04-08

Publications (2)

Publication Number Publication Date
EP0062228A1 EP0062228A1 (de) 1982-10-13
EP0062228B1 true EP0062228B1 (de) 1985-06-26

Family

ID=22953621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820102393 Expired EP0062228B1 (de) 1981-04-08 1982-03-23 Brenner für die Verbrennung mehrerer Brennstoffe

Country Status (3)

Country Link
EP (1) EP0062228B1 (enrdf_load_stackoverflow)
CA (1) CA1204999A (enrdf_load_stackoverflow)
DE (1) DE3205640A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4902221A (en) * 1987-05-12 1990-02-20 Control Systems Company Burner assembly for coal fired furnaces
DE3825291A1 (de) * 1988-07-26 1990-02-01 Ver Kesselwerke Ag Verfahren und feuerungsanlage zur verbrennung fossiler brennstoffe unter reduzierter bildung von stickoxiden
DE3933050C2 (de) * 1989-10-04 2000-06-15 Pillard Feuerungen Gmbh Verfahren zum Betreiben eines Brenners für Drehrohröfen und Brenner hierfür
CN108916876A (zh) * 2018-07-05 2018-11-30 南京锐控机电制造有限公司 气源自动识别控制装置及气源自动识别方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE349608C (de) * 1918-12-29 1922-03-04 Wilhelm Lautenschlaeger Brenner fuer staubfoermigen und fluessigen Brennstoff
CH429002A (de) * 1963-02-24 1967-01-31 Ghelfi Salvatore Brenner zur Verbrennung von wahlweise einem oder verschiedenen einspritzbaren Brennstoffen
US3788796A (en) * 1973-05-09 1974-01-29 Babcock & Wilcox Co Fuel burner
US3904349A (en) * 1974-05-22 1975-09-09 Babcock & Wilcox Co Fuel burner
BE843283A (nl) * 1976-06-23 1976-10-18 Brander
US4162140A (en) * 1977-09-26 1979-07-24 John Zink Company NOx abatement in burning of gaseous or liquid fuels
DE3105540A1 (de) * 1981-02-16 1982-09-02 Steag Ag, 4300 Essen Verfahren zum zuenden eines als rundbrenner ausgebildeten staub-leistungsbrenners mit zentral im leistungsbrenner angeordnetem staub-zuendbrenner mit pneumatischer haltung der zuendstaubflamme und brenneranordnung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
CA1204999A (en) 1986-05-27
DE3205640A1 (de) 1983-02-24
DE3205640C2 (enrdf_load_stackoverflow) 1990-02-08
EP0062228A1 (de) 1982-10-13

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