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WO1992000490A1 - Bruleur - Google Patents

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Publication number
WO1992000490A1
WO1992000490A1 PCT/JP1990/000855 JP9000855W WO9200490A1 WO 1992000490 A1 WO1992000490 A1 WO 1992000490A1 JP 9000855 W JP9000855 W JP 9000855W WO 9200490 A1 WO9200490 A1 WO 9200490A1
Authority
WO
WIPO (PCT)
Prior art keywords
pilot
primary combustion
combustion gas
pipe
outer cylinder
Prior art date
Application number
PCT/JP1990/000855
Other languages
English (en)
Japanese (ja)
Inventor
Saburo Maruko
Original Assignee
Nippon Chemical Plant Consultant 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 Nippon Chemical Plant Consultant Co., Ltd. filed Critical Nippon Chemical Plant Consultant Co., Ltd.
Priority to PCT/JP1990/000855 priority Critical patent/WO1992000490A1/fr
Publication of WO1992000490A1 publication Critical patent/WO1992000490A1/fr

Links

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 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection

Definitions

  • the present invention relates to a combustor used as a heating device such as a heating furnace or a once-through boiler, and particularly to a harmful substance ( ⁇ ) associated with combustion while enhancing heating efficiency.
  • a harmful substance ⁇
  • the present invention relates to a combustor in which heat generated by the secondary combustion performed by the secondary combustion is used as sensible heat.
  • this type of combustor uses radiant heat from a flame obtained in a single combustion and sensible heat from a high-temperature combustion gas.
  • the present invention has been made in view of the above-mentioned circumstances, and its purpose is to reduce the primary and secondary oxygen in the air supplied for combustion. By using the two-stage combustion, it can be almost completely used.In the primary combustion, heat is dissipated, and in the secondary combustion, the sensible heat of the combustion gas is used to increase the heating efficiency.
  • An object of the present invention is to provide a combustor in which the generation of harmful substances NO X is minimized.
  • a mixing method in which fuel is mixed with air so as to have a concentration corresponding to a required combustion gas temperature.
  • An inner pipe made of ceramic having a primary combustion means for primary combustion of gas, and an outflow passage of the primary combustion gas by the primary combustion, and the inner pipe is formed.
  • An outer pipe coaxially disposed with a predetermined space between the inner pipe and the inner pipe so as to heat the outer pipe from the outside, and the primary combustion gas is subjected to secondary combustion.
  • a secondary combustion means provided in the vicinity of a primary combustion gas outlet of the outer tube, and an outer cylinder made of a heat insulating material surrounding the outer tube coaxially with a predetermined space.
  • a heat receiving surface provided along the inner wall of the outer tube, and heat generated by the primary combustion is transferred to the outer tube by the outer tube.
  • the heat is radiated from the outer surface toward the heat receiving surface, while the heat from the secondary combustion is applied to the heat receiving surface as sensible heat of the secondary combustion gas.
  • An improved combustor is provided.
  • the fuel according to the first aspect is provided.
  • a burner wherein the primary combustion means is coaxially inserted into one side (upstream side) of the inner pipe so as to introduce a mixed gas of main fuel and air into the inner pipe.
  • a pilot burner device provided on the upstream side of the mixed gas conduit, and the secondary combustion means includes the primary combustion device.
  • a secondary mixer for mixing the combustion gas and the secondary fuel; and a downstream side of the secondary mixer, and between the front pipe and the heat receiving surface.
  • a honeycomb member provided substantially upstream of the outlet for discharging the secondary combustion gas into the space so as to be substantially orthogonal to the flow of the secondary combustion gas.
  • a combustor including is provided.
  • the combustor according to the first aspect wherein the primary combustion ignited by the pilot burner device.
  • the primary combustion ignited by the pilot burner device.
  • a combustor further including another honeycomb member provided in a diametric direction.
  • An outer cylinder for a pilot burner provided at the base end of the inner cylinder for the pilot partner via an insulating material, and provided at the center of the base end of the outer cylinder.
  • a pilot inserted so as to reach the center of the inside of the inner tube for the pilot burner from one outer side of the outer tube for the pilot burner.
  • the pilot heater is provided on the other outer side surface of the outer tube so as to communicate with the ignition heater and the space of the outer tube for the pilot burner.
  • a sintering apparatus including a secondary air introduction pipe is provided.
  • the primary combustion gas having a large unburned oxygen remaining amount is used only for radiant heat transfer, and the primary combustion gas is reburned and unburned. because it was because Shi not reduce the amount of oxygen secondary combustion gas is Ru are used in convective heat transfer to the radiation of al beauty. ing in the same manner as the theoretical combustion temperature 1 9 0 0 e C about combustion row Tsu Na . However, the amount of residual oxygen in the discharged combustion gas is also reduced, and the generation of harmful substance Nox can be reduced to 10 ⁇ .p.m. Become .
  • the use of the combustor according to the present invention in almost all conventional heating furnaces utilizing conventional burners reduces the generation of NOX. It is possible to keep it below 110.
  • FIG. 1 is an overall schematic longitudinal sectional view showing a specific example of the present invention
  • FIGS. 2, 3 and 4 are lines ⁇ - ⁇ and m-in in FIG. 1, respectively. Then, it is a cross-sectional view along the line IV-I.
  • the specific example shown is a combustor used for a once-through boiler.
  • reference numeral 1 indicates the outer cylinder of a combustor made of a heat-insulating member, which was made of aluminum or virgin fiber as a heat-insulating member.
  • the member is suitably used. The same is true not only for the outer cylinder, but also for the heat insulating member used in other parts of the combustor.
  • an inner pipe 2 for performing primary combustion is provided upright at a substantially central position inside the outer cylinder 1, and a lower end of the inner pipe 2 is provided with an insulating member. It is fixed to the inner surface of the bottom of the outer cylinder 1 via An opening 1a is formed in the upper central part of the outer cylinder 1, and a gas mixture for primary combustion is introduced into the inner pipe 2 through the opening 1a.
  • the mixed gas conduit 3 is provided through a lid 4 made of a heat insulating material.
  • the lower part of the mixed gas conduit 3 is supported by the upper end of the inner pipe 2 via a heat insulating member 2a, and the lower end opening is located above and substantially in the center of the inner space of the inner pipe 2 serving as the primary combustion chamber.
  • a mixed gas intake pipe 3a communicating with a main mixer 5 for mixing main fuel and air for primary combustion.
  • the opening at the tip is connected.
  • the main fuel is mixed with air so as to have a concentration corresponding to the required temperature of the combustion gas, and the mixed gas is supplied to the inner pipe 2 as a mixed gas. It is introduced into the primary combustion chamber.
  • Reference numerals 5a and 5b are conduits for introducing main fuel and air to the main mixer 5, respectively.
  • a flange portion 3b is provided at the upper end of the mixed gas conduit 3, and a double structure is formed through the flange portion 3b so as to have a space portion 6a.
  • the formed outer cylinder for pilot burner 6 is fixed to the mixed gas conduit 3.
  • An inner cylinder 7 for a pilot burner is provided at a central portion on the inner side of the outer cylinder 6 through a heat insulating member, and is formed at an upper end of the inner cylinder 7.
  • the opening 7a communicates with the space 6a of the outer cylinder 6 for the pilot burner, and there is air and pilot fuel for the pilot burner.
  • the tip of a nozzle 8 for ejecting the mixed gas into the inner cylinder 7 is placed.
  • the nozzle The base end of 8 penetrates through the center top of the outer cylinder 6 for the pilot burner and protrudes outward to produce a gas mixture for the pilot burner. It is connected to the mixer 9 for one-to-one connection.
  • the mixer 9 is connected with a pilot fuel inlet pipe 10 and a primary air inlet pipe 11 for a pilot burner.
  • the inner tube 7 for the pilot burner extends almost coaxially along the axial direction of the mixed gas conduit 3, and its lower end opening is downstream from the mixed gas intake pipe 3a. It is located on the side.
  • the double-structured side wall of the outer cylinder penetrates in a substantially orthogonal direction, and the tip thereof is the pipe mouth inner cylinder 7 for the burner.
  • a pilot burner ignition heater 12 extending to the axis of the burner.
  • the tip of the ignition heater 12 is located immediately below the jet nozzle 8 for jetting the gas mixture for the pilot burner.
  • the ignition heater 12 shown in Fig. 1 is of the hot surface ignition type. You can also use the talk-type.
  • the other side of the outer cylinder 6 for the pilot burner is connected to the space 6a of the outer cylinder 6 so as to communicate with the pilot burner.
  • the air introduction pipes 13 are connected.
  • the secondary air for the pilot burner is introduced into the inner cylinder 7 through the space 6 a of the outer cylinder 6 and the upper opening 7 a of the inner cylinder 7.
  • the temperature of the pilot combustion gas which tends to be high, is cooled to about 130 to 140 ° C.
  • FIG. 1 further includes the components described below.
  • the outer circumference of the inner pipe 2 in the radial direction is such that an outer pipe 14 having a diameter smaller than that of the inner pipe 2 extends coaxially along the outer peripheral surface of the inner pipe 2. It is provided.
  • a donut-ring-like space (primary combustion gas outflow passage) 15 is formed between the inner pipe 2 and the outer pipe 3 in a cross section, and the space 15 Is connected to the inside of the inner pipe 2 through a plurality of openings (primary combustion gas outlets) 2b formed in the lower part of the inner pipe 2.
  • the upper part of the outer tube 2 is open, and a cylindrical outer tube support 16 having an inverted truncated cone shape made of a heat insulating member is provided on the outer peripheral portion thereof through the inner peripheral surface at the lower end thereof. It is fixed almost coaxially with the outer tube 2. The upper end of the outer tube support 16 is supported by the upper opening 1a of the combustor.
  • the upper surface of the heat insulating member 2a provided so as to close the upper end opening of the inner pipe 2 except for the introduced mixed gas conduit 3 has an outer surface of the inner pipe 2.
  • a ring-shaped secondary fuel jet nozzle 17 having an outer diameter substantially the same as the diameter is provided so as to surround the mixed gas conduit 3. Secondary fuel is ejected in the radial direction from port 17 toward the outlet of primary combustion gas outlet passage 15. Thus, at the outlet of the next combustion gas outlet passage 15, the primary combustion gas and the secondary combustion gas, which are created in the inner pipe 2 and contain unburned oxygen, And the ingredients are mixed.
  • Nozzle unit 17 has a secondary fuel conduit 18 for introducing secondary fuel from the outside, and a cooling water inlet pipe 19 for cooling the nozzle unit 17. It is connected to the cooling water discharge pipe 20 by force.
  • the reason for cooling the nozzle unit 17 is that if the nozzle unit 17 is not maintained at about 500 ° C. or less, the introduced secondary fuel is kept inside the nozzle. This is the force that causes coking to close the nozzle hole and prevent secondary fuel from being ejected.
  • a truncated cone-shaped covering 21 whose diameter is reduced upward is formed coaxially with the support 16 of the outer tube 2 on the upper part of the nozzle lug 17.
  • a ring-shaped space 22 extending upward is formed between the inner peripheral surface of the support 16 and the outer peripheral surface of the cover 21. Since the flow rate of the primary combustion gas containing the secondary fuel gradually decreases after flowing into this ring-shaped space, the secondary fuel is sufficiently mixed with the primary combustion gas during this time. Then, the secondary combustion by the gas phase combustion is caused.
  • the side wall of the outer tube support 16 extends along the circumferential direction of the outer tube support 16 so that the secondary combustion gas from the secondary combustion is guided to the inner chamber of the combustor surrounded by the outer cylinder 1.
  • a plurality of openings (secondary combustion gas outlets) 23 are formed at equal intervals from each other.
  • a heat receiving surface 24 composed of a plurality of metal tubes or a single ring-shaped cylinder continuous in the circumferential direction along the side wall of the outer cylinder 1. It has been done. (In the specific example shown in the figure, In some cases, the heat receiving surfaces are coaxially arranged in two rows in parallel.
  • a heated fluid (eg, water) inlet 25 provided at the lower end of one side of the outer cylinder 1 and the inner bottom surface of the outer cylinder 1 are disposed. The fluid to be heated is allowed to flow through the communication pipe 26.
  • the fluid heated through the heat receiving surface is supplied to the communication pipe 27 arranged above the inside of the outer cylinder 1 (combustor inner chamber) and the heating fluid provided at the upper end on one side of the outer cylinder 1. From the outlet, it is sent to an external predetermined heat utilization device.
  • Reference numeral 29 indicates an exhaust pipe for secondary combustion gas.
  • the residence time of each of the primary combustion gas and the secondary combustion gas in the primary combustion and the secondary combustion described above is 0.03 seconds or less, the combustion reaction takes place.
  • the honeycomb 30 in the primary combustion chamber inside the inner pipe 2 is located at the lower end of the inner pipe 2 and is located near the upstream side of the primary combustion gas outlet 2b. It is installed via a heat insulating member in the radial direction of the device.
  • the honeycomb 31 is located downstream of the secondary fuel jet nozzle unit 17, and is formed only on the support 16 of the outer tube 14.
  • the honeycombs 30 and 31 and the inner and outer pipes 214 are formed of a sintering reaction type silicon carbide material.
  • the inner pipe 2, outer pipe 14 and / or both pipes 30 and 31 are preheated by the pilot burner device. . This preheating operation is completed when the primary combustion in the inner pipe 2 is started.
  • the mixed gas flowing from the mixed gas conduit 3 comes into contact with the hot wall surface—starts the next combustion, and the honeycomb 30 If installed, combustion is further enhanced here by about 140,000.
  • the primary combustion gas of C it flows into the primary combustion outflow passage 15 from the primary combustion gas outlet 2b.
  • the primary combustion gas mixed with the secondary fuel by the nozzle lut 17 is a ring-shaped gas formed inside the outer pipe support 16.
  • the flow velocity is reduced in the secondary combustion chamber in the space 22, and secondary combustion by gas phase combustion occurs because of containing unburned oxygen.
  • the secondary combustion gas is completely burned in the honeycomb and is about 400 mm.
  • the secondary combustion gas of C flows into the combustor inner chamber from the secondary combustion gas outlet 23 formed in the outer pipe support 16, and the heat receiving surface 24 is exposed by the secondary combustion gas. Heated by heat.
  • the secondary combustion gas that has finished heating the heat receiving surface 24 is discharged out of the combustor through the gas discharge port 29.

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)
  • Gas Burners (AREA)

Abstract

Brûleur dans lequel la combustion s'effectue en deux étapes pour utiliser un gaz de combustion primaire destiné uniquement au transfert de chaleur radiante et un deuxième gaz de combustion obtenu par recombustion du premier gaz de combustion renfermant de l'oxygène non brûlé pour le transfert de chaleur radiante et de convexion. Ce brûleur comporte un tuyau intérieur (2) pourvu de moyens de combustion primaire, un tuyau extérieur (14) formant le passage (15) du gaz de combustion primaire et disposé concentriquement par rapport au tuyau intérieur avec un espace déterminé prévu entre pour chauffer le tuyau intérieur depuis l'extérieur, des moyens de combustion secondaire (17, 22, 31) disposés au voisinage de la sortie gaz de combustion primaire du tuyau extérieur, permettant la recombustion du gaz de combustion primaire, et des surfaces de réception de chaleur (24) s'étendant le long de la paroi latérale intérieure d'un cylindre extérieur (1) et comprenant un élément calorifuge entourant coaxialement le tuyau extérieur avec un espace intermédiaire déterminé.
PCT/JP1990/000855 1990-06-29 1990-06-29 Bruleur WO1992000490A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1990/000855 WO1992000490A1 (fr) 1990-06-29 1990-06-29 Bruleur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1990/000855 WO1992000490A1 (fr) 1990-06-29 1990-06-29 Bruleur

Publications (1)

Publication Number Publication Date
WO1992000490A1 true WO1992000490A1 (fr) 1992-01-09

Family

ID=13986601

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1990/000855 WO1992000490A1 (fr) 1990-06-29 1990-06-29 Bruleur

Country Status (1)

Country Link
WO (1) WO1992000490A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016527467A (ja) * 2013-07-17 2016-09-08 エドワーズ リミテッド 放射バーナ用ヘッドアセンブリ

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5245736A (en) * 1975-10-08 1977-04-11 Daido Sanso Kk Combustion method and device for restricted nitrogen oxide generation
JPS5360728A (en) * 1976-11-11 1978-05-31 Loeoef Nils Oskar T Furnace
JPS57150443A (en) * 1981-03-12 1982-09-17 Matsushita Electric Ind Co Ltd Combustion catalyst body
JPS5916164B2 (ja) * 1976-12-22 1984-04-13 エンゲルハ−ド・ミネラルズ・アンド・ケミカルズ・コ−ポレ−シヨン 炭素質燃料を接続燃焼させる方法
JPS59136140A (ja) * 1983-01-25 1984-08-04 Babcock Hitachi Kk 燃焼用触媒体
JPS6014143Y2 (ja) * 1980-08-08 1985-05-07 横河航空電機株式会社 放散塔用パイロットバ−ナ
EP0233330A1 (fr) * 1986-01-18 1987-08-26 DEUTSCHE FORSCHUNGSANSTALT FÜR LUFT- UND RAUMFAHRT e.V. Ensemble de brûleur-chaudière
JPS63113207A (ja) * 1986-10-30 1988-05-18 Kawasaki Steel Corp 排熱回収式バ−ナ
JPH0277420U (fr) * 1988-11-26 1990-06-14

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5245736A (en) * 1975-10-08 1977-04-11 Daido Sanso Kk Combustion method and device for restricted nitrogen oxide generation
JPS5360728A (en) * 1976-11-11 1978-05-31 Loeoef Nils Oskar T Furnace
JPS5916164B2 (ja) * 1976-12-22 1984-04-13 エンゲルハ−ド・ミネラルズ・アンド・ケミカルズ・コ−ポレ−シヨン 炭素質燃料を接続燃焼させる方法
JPS6014143Y2 (ja) * 1980-08-08 1985-05-07 横河航空電機株式会社 放散塔用パイロットバ−ナ
JPS57150443A (en) * 1981-03-12 1982-09-17 Matsushita Electric Ind Co Ltd Combustion catalyst body
JPS59136140A (ja) * 1983-01-25 1984-08-04 Babcock Hitachi Kk 燃焼用触媒体
EP0233330A1 (fr) * 1986-01-18 1987-08-26 DEUTSCHE FORSCHUNGSANSTALT FÜR LUFT- UND RAUMFAHRT e.V. Ensemble de brûleur-chaudière
JPS63113207A (ja) * 1986-10-30 1988-05-18 Kawasaki Steel Corp 排熱回収式バ−ナ
JPH0277420U (fr) * 1988-11-26 1990-06-14

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016527467A (ja) * 2013-07-17 2016-09-08 エドワーズ リミテッド 放射バーナ用ヘッドアセンブリ

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