WO2018155735A1 - Brûleur composite à faible émission de nox - Google Patents

Brûleur composite à faible émission de nox Download PDF

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Publication number
WO2018155735A1
WO2018155735A1 PCT/KR2017/001989 KR2017001989W WO2018155735A1 WO 2018155735 A1 WO2018155735 A1 WO 2018155735A1 KR 2017001989 W KR2017001989 W KR 2017001989W WO 2018155735 A1 WO2018155735 A1 WO 2018155735A1
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WO
WIPO (PCT)
Prior art keywords
tube
fuel
spud
burner
combustion
Prior art date
Application number
PCT/KR2017/001989
Other languages
English (en)
Korean (ko)
Inventor
이종태
박재언
Original Assignee
주식회사 수국
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 주식회사 수국 filed Critical 주식회사 수국
Priority to CN201780002341.4A priority Critical patent/CN108738333B/zh
Priority to PCT/KR2017/001989 priority patent/WO2018155735A1/fr
Priority to JP2018502153A priority patent/JP6595089B2/ja
Priority to KR1020197018657A priority patent/KR102230908B1/ko
Publication of WO2018155735A1 publication Critical patent/WO2018155735A1/fr
Priority to HK18115515.4A priority patent/HK1256477A1/zh

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    • 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
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • 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
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • 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
    • F23D14/62—Mixing devices; Mixing tubes

Definitions

  • the present invention relates to a low-nox burner, and more particularly, a hybrid type for reducing NOx generation by implementing a gas staging combustion technology and an internal fluorine gas recirculation (IFGR) combustion technology in one burner. It is about low knox burner.
  • IFGR internal fluorine gas recirculation
  • NOx is fuel NOx produced by oxidizing a nitrogen component chemically bonded to a fuel during combustion, and thermal knox generated by liberation of nitrogen contained in combustion air at a high temperature.
  • Thermal NOx and prompt NOx, which is rapidly generated when hydrocarbon-based fossil fuels are exposed to high temperatures in high concentrations.
  • the first generation low knox technology is the air staging technology, which supplies air to the combustion stage by stage to prevent rapid oxidation reaction by fuel in the combustion furnace to lower the temperature of flame and thereby Reduce Thermal Knox
  • the 2nd generation low-nox technology is a gas staging technology, which is divided into a center part (about 5% to 25%) and an outer part (75% to 95%) to eject gas, and the center part has excess air.
  • the outer part forms an air shortage state, thereby suppressing the oxidation reaction of the outer part occupying most of the flame so that the flame temperature is not increased, thereby reducing the occurrence of thermal rust.
  • Prompt rust may occur due to an air shortage of the outer flame, but prompt knox generation may be suppressed by ejecting gas into a space having a temperature of 1000 ° C. or less while assisting the flame function from the central flame.
  • 3rd generation In 3rd generation low-nox technology, IFGR (Internal Flue Gas Recirculation) is typically used as the combustion gas is mixed with flames by allowing the primary combustion combustion gas in the combustion chamber to self-recirculate in the combustion chamber. Drop to reduce thermal rust.
  • IFGR Internal Flue Gas Recirculation
  • Korean Patent No. 10-1466809 has caused a vortex in the combustion head to improve the mixing characteristics of fuel and air to combust fuel and allow the combustion gas to self-recycle, thereby greatly reducing the generation of rust.
  • An object of the present invention is to improve a conventional low knox burner and to provide a low knox burner which further reduces the amount of rust generated by applying a gas staging combustion technology to the improved IFGR technology.
  • the hybrid low knox burner according to the present invention for achieving the problem to be solved by the present invention is a hybrid low knox burner installed in the burner mounting hole of the combustion chamber, inserted into the burner mounting hole, the tip is exposed to the combustion chamber, A tube for guiding air into the; At least one end of the tube is formed in a pipe shape for forming a split flame by injecting fuel into the combustion chamber, the outer peripheral region of the fuel spud is formed a first gas inlet for the combustion gas inlet; At the first gas inlet, a second gas inlet for inlet of the combustion gas mixed with the air inside the tube is formed at the outer periphery of the tube at the rear side of the combustion chamber.
  • a combustion gas guide is formed obliquely in the flow direction of air.
  • the fuel spud branches from the fuel supply line and is spaced apart from the first spud tube and is spaced apart from the first spud tube to form a first gas inlet and inserted into the tube and inserted into the split flame. Forming a second spud tube.
  • the fuel spud is spaced apart from the first supply pipe and branched from the fuel supply pipe, and spaced apart from the first spud pipe to form a first gas inlet, and arranged outside the tube to form a split flame. It may also include a second spud tube.
  • An end of the first spud tube is provided with a reduced diameter injection connection for injecting fuel towards the second spud tube.
  • the end portion of the first gas inlet side has a diameter extension portion extending in diameter toward the first spud tube.
  • the present invention it is possible to fuse the gas staging technology to the burner according to the improved IFGR technology in which the self-recirculation of the combustion gas is effectively performed, thereby further reducing the amount of rust generated than the low knox burner to which the conventional IFGR technology is applied.
  • FIG. 1 is a side cross-sectional view showing a state where a hybrid low knox burner according to a first embodiment of the present invention is installed in a combustion chamber.
  • FIG. 2 is a perspective view of a portion of the end of the tube cut in FIG. 1.
  • FIG 3 is an operational state diagram showing the flow of air, fuel gas and combustion gas in the hybrid low-nox burner according to the first embodiment of the present invention.
  • FIG. 4A is a diagram illustrating a gas flow between a fuel nozzle and a diffuser in FIG. 1.
  • 4B is a view illustrating a gas flow when there is a step between the fuel nozzle and the diffuser in FIG. 1.
  • FIG. 5 is a flow conceptual diagram of a hybrid low knox burner according to a first embodiment of the present invention.
  • FIG. 6 is a side cross-sectional view showing a state in which a hybrid low knox burner according to a second embodiment of the present invention is installed in a combustion chamber.
  • FIG. 7 is a perspective view of the end portion of the tube in FIG. 6;
  • FIG. 8 is a flow conceptual diagram for a hybrid low knox burner according to a second embodiment of the present invention.
  • a tube is inserted into one side of the combustion chamber referred to herein to receive fuel and air, and an exhaust pipe is formed on the other side of the combustion chamber to discharge the burned combustion gas.
  • an exhaust pipe is formed on the other side of the combustion chamber to discharge the burned combustion gas.
  • Tubes and burners referred to in this specification may be represented in a conceptual cross-sectional view without omission or description of the components to be added. However, this is omitted for the convenience of explanation and understanding of the present invention, the structure and connection of the tube and the burner according to the embodiment should not be limited by the illustrated drawings and description.
  • FIG. 1 is a side cross-sectional view illustrating a state in which a hybrid low knox burner is installed in a combustion chamber according to a first embodiment of the present invention, and FIG. As shown, the hybrid low-nox burner 100 according to the first embodiment of the present invention is inserted into the burner mounting hole HL of the combustion chamber FR and fixedly installed by the mounting plate MP, and the wall WL.
  • At least one end of the tube 110 is provided with a pipe shape for forming a split flame by injecting fuel into the combustion chamber, the outer periphery of the first gas inlet 151 for the combustion gas inlet is formed in the fuel
  • the spud 150 is provided.
  • the second gas inlet 112 for inlet of the combustion gas mixed with the air inside the tube 110 is formed at the outer periphery of the tube at the rear of the combustion chamber outside.
  • a blower 115 coupled to the tube 110 to forcibly supply external air to the inside of the tube 110.
  • the side diameter portion 111 is formed to be curved while having a gentle slope toward the protrusion 124 of the fuel supply pipe 120 protruding from the diffuser 130. Through this, the air passage toward the diffuser 130 is narrowed in the air supply passage 161 formed at the interval d1 between the outer circumferential edge of the diffuser 130 and the side diameter portion 111, thereby increasing the flow rate of the air. . Air is supplied to the diffuser 130 through the air supply passage 161, and at this time, fuel is injected through the fuel injection pipe 140 to form a flame.
  • the end of the tube 110 forms a diameter extension 116 that is larger in diameter than the middle portion 114 where the first spud tube, which will be described later, of the fuel spud 150 is disposed.
  • a combustion gas guide 113 is formed obliquely in a flow direction of air, and the combustion gas of the combustion chamber is recirculated into the middle part 114 of the tube 110.
  • the combustion gas guide unit 113 is preferably formed in the shape of a nozzle having a smaller diameter at the outlet side than the diameter at the inlet side, so that the combustion gas is introduced into the tube 110.
  • a central air injection pipe 121 for injecting external air from the tip of the fuel supply pipe 120 in the axial direction S of the fuel supply pipe 120 is disposed inside the fuel supply pipe 120.
  • the central air injection pipe 121 By this central air injection pipe 121, the diameter of the flame is increased by the air to be sprayed to prevent the concentration of the flame in the center of the flame. As a result, the temperature of the flame center is prevented from rising excessively, and the amount of thermal knox produced is reduced.
  • Air through the central air injection pipe 121 is injected into the combustion chamber FR through the air injection hole formed in the center of the diffuser 130, the air injection hole is formed smaller than the inner diameter of the central air injection pipe 121 desirable. As shown in the flow analysis diagram of FIG. 5, the central air injection pipe 121 may be removed.
  • the diffuser 130 has a disc shape (disc type) and includes a plurality of air holes 131 for injecting air supplied through the air supply passage 161 to the combustion chamber FR.
  • the air hole 131 supplies an air to the center of the flame, or when the diameter of the diffuser 130 increases in accordance with the increase in the burner capacity, to form an auxiliary flame to improve the flame resistance of the flame formed in the diffuser 130 Is prepared to.
  • the nozzles of the air holes 131 and the fuel injection pipe 140 are arranged at a predetermined angle, the amount and pressure of air discharged from the air holes 131 may have uniformity with respect to the front end of the plate of the diffuser 130. And when mixed with fuel injected from the nozzle, the mixing ratio of fuel and air can also be expected to be uniform.
  • the fuel injection pipe 140 is disposed radially at the end of the fuel supply pipe 120 and includes a fuel nozzle 141 for ejecting fuel in a direction orthogonal to air supplied through the air supply passage 161.
  • the fuel injected from the fuel nozzle 141 intersects the air discharged through the air supply passage 161 at an angle close to 90 degrees. Accordingly, the fuel is injected and rapidly mixed with the air supplied through the air supply passage 161 to form a flame, and the center is formed by the air guided to the radial center of the combustion chamber FR through the side portion 111. It can form a concentrated flame.
  • the flame is concentrated to the center, and dispersed to form a long-necked region, the width of the region is narrow, as the pressure is lowered, the combustion gas is guided to the long-necked region, the combustion gas to achieve a self-recirculation.
  • the radial end of the fuel injection pipe 140 and the outer periphery of the diffuser 130 are at the same position as shown in FIG. 4A, but as shown in FIG. 4B, the fuel injection pipe 140 is disposed in the fuel injection pipe 140.
  • a gap d2 may be formed between the end of the fuel injection pipe 140 and the edge of the diffuser 130 plate. have.
  • the gap gap d2 may be set to 0.1% to 50% of the diameter of the nozzle of the fuel injection pipe 140.
  • FIG. 4A illustrates a case where the length of the fuel injection tube 140 is the same as the outer peripheral end of the diffuser 130
  • FIG. 4B illustrates a case where the length of the fuel injection tube 140 does not reach the outer peripheral end of the diffuser 130.
  • the outer circumferential end of the diffuser 130 and the end of the fuel injection pipe 140 forms a step d2, the air from the air supply passage 161 to the combustion chamber is diffused to the area where the step is generated vortex Can be formed. Accordingly, the fuel injected from the fuel injection pipe 140 may be rapidly mixed with the air supplied through the air supply passage 161.
  • the diffuser 130 structure of FIG. 4B improves the combustibility of fuel by rapidly mixing fuel and air using vortex.
  • the fuel and air are rapidly mixed and combusted to form a long-necked flame
  • the combustion gas S3 is introduced into the long-necked region S1
  • the combustion gas S3 is the first gas inlet.
  • P1, P2 the temperature of the combustion gas is lowered and supplied to the region S2 in the excess fuel state to control the thermal and prompt knox (FIG. 5). Reference).
  • the fuel spud 150 branches from the fuel supply pipe 120 and extends outwardly from the middle portion 112 of the tube 110 and the first spud pipe 152 and the first spud pipe 152. And a second spud pipe 153 which is disposed at intervals to form a first gas inlet 151 and is inserted and inserted through the inside of the tube 110 in the diameter expansion part 116 to form a split flame. Include. An end portion of the first spud tube 152 is provided with an injection connection 154 having a reduced diameter to inject fuel toward the second spud tube 153. In the second spud pipe 153, an end portion of the first gas inlet 151 side is formed with a diameter extension part 153a having a diameter extended toward the first spud pipe 152.
  • the main flame Thermal knox can be controlled by lowering the temperature of the over split flame, i.e. the temperature of the entire "flame group.”
  • the following describes the contents of lowering the temperature of the flame group by incorporating the gas staging method into the IFGR.
  • FIG 3 is a functional state diagram showing the flow of air, fuel gas and combustion gas in the hybrid low-nox burner according to the first embodiment of the present invention
  • Figure 5 is a hybrid low-nox burner according to the first embodiment of the present invention
  • a flow conceptual diagram for a longitudinal flow conceptual diagram at a portion where a fuel spud is located in the diffuser is shown.
  • the air flow A1 is formed through the central air injection pipe 121 to the center of the combustion chamber FR, and the fuel gas flow B1 is formed through the fuel supply pipe 120. While the fuel injection pipe 140 is injected to form a main flame, the fuel gas flow (B2) is formed auxiliary through the fuel spud 150 branched from the fuel supply pipe 120, the fuel is injected to form a split flame Form.
  • the air flow (C1) through the tube 110 in accordance with the operation of the blower 115 is a combustion gas flow (P2) through which the combustion gas of the combustion chamber (FR) through the second gas inlet 112 ( 110 is introduced into the air and gas flow (C1 + P2) to generate a main flame
  • the air flow B2 through the first spud pipe 152 of the fuel spud 150 is the first gas inlet
  • the fuel gas flow B2 + P1 is introduced into the second spud pipe 153 of the fuel spud 150 into the combustion gas flow P1 through which the combustion gas of the combustion chamber FR is circulated through the 151. To create a split flame.
  • the main flame formed through the diffuser 130 and the split flame generated by the fuel spud 150 may form one "flame group.”
  • the flame group formed by the diffuser 130 and the fuel spud 150 increases the surface area of the flame inside the combustion chamber FR, thereby lowering the temperature of the flame group by promoting the absorption of radiant heat in the heat transfer surface of the combustion chamber FR. have.
  • the pressure around the split flame may be lowered by the fuel injected at high speed in the fuel spud 150. Accordingly, the combustion gas S3 primary combusted in the combustion chamber FR is attracted around the diffuser 130 and the fuel spud 150 having a low pressure, which causes the magnetization of the combustion gas S3 inside the combustion chamber FR. Recycling can be induced.
  • the fuel spud 150 injects a portion of the combustion gas S3 into the fuel spud 150 to supply fuel.
  • the calorific value of the fuel injected from the spud 150 may be lowered. This can be expected to lower the temperature of the entire flame group.
  • the fuel spud 150 is divided into a first spud tube 152 and a second spud tube 153, and the fuel is injected from the first spud tube 152 to the second spud 153.
  • the injection pressure at the time lowers the pressure around the first gas inlet 151, and the combustion gas S3 is attracted and introduced to the first gas inlet 151 having a low pressure. That is, when high-pressure fuel is injected from the fuel injection hole of the second spud pipe, the vicinity of the fuel injection hole, for example, the first gas inlet 151 or the surrounding area may have a lower pressure than the injection pressure of the fuel injection hole.
  • the combustion gas S3 is moved toward the first gas inlet 151 in the combustion chamber FR by the pressure difference, and the combustion gas S3 is self-recirculated inside the combustion chamber FR according to the movement of the combustion gas S3. Self-Recirculation can be achieved.
  • the fuel injected at the fuel inlet of the second spud pipe 153 becomes a mixture of "fuel + combustion gas S3", instead of air
  • the combustibility of the fuel is lower than that of the contact between air and the fuel, and this has the effect of lowering the temperature of the split flame generated in the fuel spud 150.
  • the temperature of the split flame is lowered, the temperature of the flame group injected from the diffuser 130 and the fuel spud 150 is lowered, which may reduce the thermal knox generated in the flame group.
  • the fuel and air injected through the diffuser 130 increases the surface area of the flame inside the combustion chamber FR by the combustion gas introduced through the second gas inlet 112, thereby increasing the surface area of the flame on the heat transfer surface of the combustion chamber FR.
  • the temperature of the flame group can be lowered. That is, after the combustion gas S3 primary combustion in the combustion chamber FR is drawn around the low pressure diffuser 130 and the fuel spud 150, the inside of the tube 110 through the second gas inlet 112. It may be introduced into the to induce a magnetic recycle of the combustion gas (S3).
  • the combustion gas (S3) When the air supplied from the blower 115 flows to the combustion gas guide portion 113 of the tube 110, the pressure around the second gas inlet 112 decreases due to the flow air pressure, and the combustion gas S3 has a low pressure. Induced and introduced into the second gas inlet 112, the combustion gas (S3) to increase the self-recirculation force in the combustion chamber (FR) in accordance with the movement of the combustion gas (S3).
  • the air in the tube 110 becomes a mixture of "air + combustion gas S3", and the amount of air decreases, which lowers the combustibility of the fuel.
  • the temperature of the flame group injected from the diffuser 130 and the fuel spud 150 is lowered, which may further reduce the thermal knox generated in the flame group.
  • FIG. 6 is a side cross-sectional view illustrating a state in which a hybrid low knox burner 200 according to a second embodiment of the present invention is installed in a combustion chamber
  • FIG. 7 is a perspective view of the end portion of the tube cut in FIG. 6, and
  • FIG. 8. Is a flow diagram for a hybrid low knox burner according to a second embodiment of the present invention.
  • the fuel spud 250 is branched from the fuel supply pipe 220 and the first spud pipe 252 extending out of the tube 210 and the first A second spud which forms the first gas inlet 251 which is spaced apart from the spud tube 252 to form a recirculated combustion gas stream P1 and is arranged outside the tube 210 to form a split flame Tube 253.
  • a second gas inlet 212 forming a combustion gas flow P2 that is recirculated for inlet of the combustion gas mixed with the air inside the tube 210 is located at the rear of the combustion chamber outside in the outer direction of the tube. Is formed.

Abstract

La présente invention concerne un brûleur composite à faible émission de NOx permettant de réduire la quantité de NOx généré, par mise en œuvre d'une technique de combustion à étagement de gaz et d'une technique de combustion à recirculation interne des gaz de fumée (IFGR) dans un seul brûleur. Selon la présente invention, le brûleur composite à faible émission de NOx disposé dans un trou de montage de brûleur d'une chambre de combustion comprend : un tube inséré dans le trou de montage de brûleur de telle sorte que son extrémité avant soit exposée à la chambre de combustion, et guidant l'air vers la chambre de combustion ; et au moins un injecteur de carburant disposé au niveau de la partie d'extrémité du tube, ayant une forme de tuyau pour former des flammes divisées au moyen d'une injection de carburant dans la chambre de combustion, et ayant une première admission de gaz, formée dans une région partielle de sa périphérie externe, pour permettre qu'un gaz de combustion s'écoule à travers celle-ci, une seconde admission de gaz pour permettre que le gaz de combustion mélangé dans l'air à l'intérieur du tube s'écoule à travers celle-ci étant formée sur la périphérie externe du tube à l'arrière de la première admission de gaz dans la direction vers l'extérieur de la chambre de combustion. Selon la présente invention, le brûleur selon une technique IFGR améliorée qui permet une autorecirculation efficace du gaz de combustion est associé à une technique d'étagement de gaz de façon à permettre que la quantité de NOx généré soit encore inférieure à celle d'un brûleur à faible émission de NOx auquel est appliquée une technique IFGR existante.
PCT/KR2017/001989 2017-02-23 2017-02-23 Brûleur composite à faible émission de nox WO2018155735A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201780002341.4A CN108738333B (zh) 2017-02-23 2017-02-23 复合型低氮氧化物燃烧器
PCT/KR2017/001989 WO2018155735A1 (fr) 2017-02-23 2017-02-23 Brûleur composite à faible émission de nox
JP2018502153A JP6595089B2 (ja) 2017-02-23 2017-02-23 バーナー
KR1020197018657A KR102230908B1 (ko) 2017-02-23 2017-02-23 복합형 저녹스 버너
HK18115515.4A HK1256477A1 (zh) 2017-02-23 2018-12-04 複合型低氮氧化物燃燒器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2017/001989 WO2018155735A1 (fr) 2017-02-23 2017-02-23 Brûleur composite à faible émission de nox

Publications (1)

Publication Number Publication Date
WO2018155735A1 true WO2018155735A1 (fr) 2018-08-30

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PCT/KR2017/001989 WO2018155735A1 (fr) 2017-02-23 2017-02-23 Brûleur composite à faible émission de nox

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JP (1) JP6595089B2 (fr)
KR (1) KR102230908B1 (fr)
CN (1) CN108738333B (fr)
HK (1) HK1256477A1 (fr)
WO (1) WO2018155735A1 (fr)

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RU2743686C1 (ru) * 2019-05-08 2021-02-24 Сукук Корпоратион ГОРЕЛКА С НИЗКИМ ВЫБРОСОМ NOx С ПЕРФОРИРОВАННОЙ ПЛАСТИНЧАТОЙ ПЛАМЕННОЙ ГОЛОВКОЙ
RU216775U1 (ru) * 2022-12-23 2023-02-28 Дмитрий Рюрикович Григорьев Модернизированная прямоточно-вихревая горелка

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JP7287811B2 (ja) * 2019-03-25 2023-06-06 三菱重工業株式会社 燃焼器及びガスタービン
KR102217216B1 (ko) * 2019-05-08 2021-02-18 주식회사 수국 타공판형 연소헤드를 가지는 저녹스 버너

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HK1256477A1 (zh) 2019-09-27
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JP6595089B2 (ja) 2019-10-23
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