WO2024111762A1 - Appareil de combustion à faible pollution capable de réguler le débit de recirculation interne d'un gaz de combustion - Google Patents

Appareil de combustion à faible pollution capable de réguler le débit de recirculation interne d'un gaz de combustion Download PDF

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Publication number
WO2024111762A1
WO2024111762A1 PCT/KR2023/004998 KR2023004998W WO2024111762A1 WO 2024111762 A1 WO2024111762 A1 WO 2024111762A1 KR 2023004998 W KR2023004998 W KR 2023004998W WO 2024111762 A1 WO2024111762 A1 WO 2024111762A1
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WO
WIPO (PCT)
Prior art keywords
combustion
air supply
supply unit
actuator
recirculation
Prior art date
Application number
PCT/KR2023/004998
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English (en)
Korean (ko)
Inventor
김세원
권민준
Original Assignee
한국생산기술연구원
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Application filed by 한국생산기술연구원 filed Critical 한국생산기술연구원
Publication of WO2024111762A1 publication Critical patent/WO2024111762A1/fr

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    • 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 
    • F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/68—Treating the combustion air or gas, e.g. by filtering, or moistening

Definitions

  • the present invention relates to combustion devices.
  • Nitrogen oxides a representative harmful gas in combustion systems, are the cause of photochemical smog and acid rain.
  • combustion is achieved by applying combustion gas (exhaust gas) recirculation, water or steam injection, and multi-stage combustion of air and fuel. It is leading to reduction of nitrogen oxides in the system.
  • the representative nitrogen oxide reduction technology is the combustion gas recirculation method, but a common combustion gas recirculation method is the external recirculation method, which recirculates the combustion gas discharged from the combustion furnace by supplying it back to the combustor using a duct, etc. from outside the combustion furnace. Because additional devices such as ducts, ducts, and blowers were required, there were problems with economic feasibility and securing space.
  • the internal recirculation method is a technology that uses the pressure difference between the combustor and the combustion furnace caused by the flow rate of fuel or air supplied to the combustion furnace to recirculate the combustion gas inside the combustion furnace by flowing it into the combustor.
  • This type of combustion device unlike the external recirculation method, has the advantage of being economically efficient and miniaturizing as it does not require equipment such as a duct connecting the combustor outside the combustion furnace or a blower installed within the duct.
  • Patent Document 1 KR 10-1512352 B1
  • the present invention was developed to solve the problems of the prior art, and aims to provide a combustion device capable of controlling the internal recirculation flow rate of combustion gas.
  • the present invention is a combustion device including a combustor whose front end is located inside a combustion furnace, comprising: a primary fuel supply unit located at the center of the combustor; A primary air supply unit located on a circumferential side of the main fuel injection unit; a secondary air supply unit located around the primary air supply unit; a recirculation inlet located around the secondary air supply unit; a secondary fuel supply unit located around the recirculation inlet; and a recirculation port that communicates the recirculation inlet and the secondary air supply, wherein the recirculation port includes: an upper plate located at the front end; and a lower plate that is spaced apart from the upper plate by a predetermined distance, is located at a rear end, and is movable, wherein the length of the predetermined gap between the upper plate and the lower plate is adjusted as the lower plate moves.
  • the actuator is preferably a pneumatic, hydraulic or solenoid actuator.
  • a combustion gas sensor that measures the concentration of components contained in combustion gas generated from the combustion furnace; and a control unit that controls the operation of the actuator.
  • the control unit controls the operation of the actuator according to the concentrations of nitrogen oxide, carbon monoxide, and oxygen measured by the combustion gas sensor.
  • a flame sensor that measures the state of a flame generated in the combustion furnace; and a control unit that controls the operation of the actuator.
  • the control unit controls the operation of the actuator according to the state of the flame measured by the flame sensor.
  • a perforated plate located at the tip of the primary air supply unit; and an inclined portion in which the front end of the outer wall of the primary air supply portion is formed to be inclined toward the center of the combustor.
  • the cross-sectional area of the recirculation port that allows the combustion gas in the combustion furnace to internally recirculate is adjusted so that the amount of recirculating combustion gas can be adjusted according to the load or combustion conditions, thereby reducing nitrogen oxides and stabilizing the flame. can be achieved, and therefore can be applied to combustion systems under more diverse conditions.
  • FIG. 1 is a schematic diagram of a combustion device according to an embodiment of the present invention.
  • Figure 2 is a schematic diagram of a combustion device according to another embodiment of the present invention.
  • Figure 3 is a schematic diagram showing the combustion process of a combustion device according to an embodiment of the present invention.
  • Figure 4 is a schematic diagram showing the combustion process of a combustion device according to another embodiment of the present invention.
  • a combustion device includes a combustion furnace 10 and a combustor.
  • the combustion furnace 10 is provided with a predetermined space within which combustion can occur.
  • the tip of the combustor is inserted into one side of the combustion furnace 10, and a flame due to combustion of the combustor is generated inside the combustion furnace 10.
  • the combustor includes a primary fuel supply 110, a primary air supply 120, a secondary air supply 130, a recirculation inlet 140, a recirculation port 150, and a secondary fuel supply 160.
  • the primary fuel supply unit 110 is located in the center of the combustor, and primary fuel is supplied into the combustion furnace 10 through the primary fuel supply unit 110.
  • the primary air supply unit 120 is located on the peripheral side of the primary fuel supply unit 110, and primary air is supplied into the combustion furnace 10 through the primary air supply unit 120.
  • a swirler 121 is located at the tip of the primary air supply unit 120 to generate a swirling flow in the primary air supplied to the combustion furnace 10 to stabilize the flame.
  • a perforated plate 122 or a mesh plate with a plurality of holes is located at the tip of the primary air supply unit, and the tip of the primary air supply unit 120 is directed toward the center of the combustor.
  • An inclined inclined portion 123 may be formed.
  • the air supplied to the combustion furnace 10 through the primary air supply unit 120 is rectified while passing through the inclined portion 123 and the perforated plate 122 (or mesh plate) to provide stability to the flame.
  • the secondary air supply unit 130 is located around the primary air supply unit 120, and secondary air is supplied into the combustion furnace 10 through the secondary air supply unit 130.
  • the recirculation inlet 140 is located around the secondary air supply part 130, and some of the combustion gas generated in the combustion chamber flows into the combustor through the recirculation inlet 140.
  • the secondary fuel supply unit 160 is located around the secondary air supply unit 130, and secondary fuel is supplied into the combustion furnace 10 through the secondary fuel supply unit 160.
  • the recirculation port 150 is located between the secondary air supply 130 and the recirculation inlet 140, so that the secondary air supply 130 and the recirculation inlet 140 communicate.
  • the combustion gas flowing into the recirculation inlet 140 from the combustion chamber flows into the secondary air supply part 130 through the recirculation port 150 and is supplied back into the combustion chamber.
  • Recirculation port 150 includes an upper plate 151 and a lower plate 152.
  • the upper plate 151 is located at the front end of the combustor, and the lower plate 152 is located at the rear end of the combustor and are spaced apart from each other by a predetermined distance (a), so that the recirculation inlet 140 and the secondary air supply part 130 Provides a space for communication.
  • the upper plate 151 and the lower play are inclined toward the front end of the combustor, and thus the combustion gas flowing into the recirculation inlet 140 is supplied into the combustion furnace 10 through the secondary air supply unit 130. It's easy to become.
  • the upper plate 151 and the lower plate 152 are positioned so that the length of a predetermined distance a spaced apart from the recirculation inlet 140 side to the secondary air supply part 130 side is narrowed. As a result, the flow rate of the combustion gas flowing from the recirculation inlet 140 to the secondary air supply unit 130 is increased, making it easy to be supplied into the combustion furnace 10 through the secondary air supply unit 130.
  • the lower plate 152 is configured to be movable in directions between the front end and the rear end of the combustor. As the lower plate 152 moves toward the front end or the rear end side, the length of the predetermined distance a between the upper plate 151 and the lower plate 152 is adjusted.
  • the flow rate of combustion gas flowing into the recirculation port 150 is adjusted by moving the lower plate 152.
  • the movement of the lower plate 152 can be done manually by connecting a rod to the lower plate 152.
  • the actuator 250 may be a pneumatic, hydraulic or electric solenoid type actuator 250 and is provided with a control unit (not shown) that controls the operation of the actuator 250.
  • a combustion gas sensor and a flame sensor are provided on one side of the combustion furnace 10.
  • the combustion gas sensor measures the concentration of components contained in the combustion gas generated during combustion, and measures the concentrations of nitrogen oxides, carbon monoxide, and oxygen contained in the combustion gas.
  • the flame sensor consists of an optical sensor that detects the color or flickering frequency of light, and measures the state of the flame through this.
  • the control unit controls the operation of the actuator 250 according to the values measured by the combustion gas sensor and the flame sensor, and controls the flow rate of combustion gas flowing into the recirculation port 150.
  • the fuel supplied into the combustion furnace 10 through the primary fuel supply unit 110 and the air supplied into the combustion furnace 10 through the primary air supply unit 120 are combusted.
  • a primary flame (F1) is generated at the central tip of the combustor.
  • the air supplied into the combustion furnace 10 through the primary air supply unit 120 is supplied while passing through the vortex 121 (or perforated plate 122, mesh plate (see FIG. 4)) and is supplied to the primary air supply unit 120. It burns with fuel and creates a primary flame (F1).
  • the air supplied into the combustion furnace 10 through the secondary air supply unit 130 and the fuel supplied into the combustion furnace 10 through the secondary fuel supply unit 160 are combusted, so that the circumference of the tip of the combustor A secondary flame (F2) is generated on the side.
  • combustion gas is generated.
  • negative pressure is generated inside the secondary air supply unit 130 by the flow rate of the secondary air supplied from the secondary air supply unit 130 into the combustion furnace 10.
  • the combustion gas inside the combustion furnace 10 flows into the recirculation inlet 140 due to the pressure difference generated inside the secondary air supply unit 130 and the combustion furnace 10 and flows through the recirculation port 150. It flows into the secondary air supply unit 130 and is burned.
  • the fuel supplied inside is combusted and a secondary flame (F2) is generated.
  • the stability of the flame may be reduced.
  • the combustion gas sensor and the flame sensor measure the concentration of components contained in the combustion gas generated in the combustion furnace 10 and the state of the flame while combustion occurs within the combustion furnace 10.
  • the control unit moves the lower plate 152 of the recirculation port 150 by controlling the operation of the actuator according to the concentration of nitrogen oxides, carbon monoxide, and oxygen in the combustion gas measured by the combustion gas sensor or the state of the flame measured by the flame sensor.
  • the flow rate of combustion gas flowing into the recirculation port 150 is adjusted.
  • the control unit operates the actuator 250 to move the lower plate 152 of the recirculation port 150 toward the front end. This reduces the cross-sectional area of the recirculation port 150 so that the recirculation flow rate of combustion gas is reduced.
  • the control unit operates the actuator 250 to operate the lower plate 152 of the recirculation port 150 toward the rear end.
  • the cross-sectional area of the recirculation port 150 is enlarged to increase the recirculation flow rate of combustion gas.
  • the control unit operates the actuator 250 to move the lower plate 152 of the recirculation port 150 toward the front end to reduce the cross-sectional area of the recirculation port 150, thereby reducing the recirculation flow rate of combustion gas.
  • the control unit when the state of the flame measured by the flame sensor is a preset flame state, that is, when the color of the flame is within the range of the preset color or the flickering frequency of the flame is below the preset frequency, the control unit operates the actuator.
  • the lower plate 152 of the recirculation port 150 By operating (250), the lower plate 152 of the recirculation port 150 is moved toward the rear end to expand the cross-sectional area of the recirculation port 150 to increase the recirculation flow rate of combustion gas.
  • the cross-sectional area of the recirculation port that allows the combustion gas in the combustion furnace to internally recirculate is adjusted so that the amount of recirculating combustion gas can be adjusted according to the load or combustion conditions, thereby reducing nitrogen oxides and stabilizing the flame. can be achieved, and therefore can be applied to combustion systems under more diverse conditions.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

La présente invention porte sur un appareil de combustion, et concerne un appareil de combustion comportant un brûleur dont le côté d'extrémité avant est situé dans une chambre de combustion, l'appareil de combustion comprenant : une première partie d'alimentation en combustible située au niveau de la partie centrale du brûleur ; une première partie d'alimentation en air située sur le côté circonférentiel d'une partie d'injection de carburant principale ; une seconde partie d'alimentation en air située sur le côté circonférentiel de la première partie d'alimentation en air ; une partie d'entrée de recirculation située sur le côté circonférentiel de la seconde partie d'alimentation en air ; une seconde partie d'alimentation en carburant située sur le côté circonférentiel de la partie d'entrée de recirculation ; et un orifice de recirculation permettant à la partie d'entrée de recirculation et à la seconde partie d'alimentation en air d'être en communication l'une avec l'autre, l'orifice de recirculation comprenant : une plaque supérieure située du côté d'extrémité avant ; et une plaque inférieure qui est espacée d'une certaine distance de la plaque supérieure et située du côté d'extrémité arrière, et est conçue pour être mobile. Lorsque la plaque inférieure se déplace, la longueur de ladite certaine distance entre la plaque supérieure et la plaque inférieure est adaptée.
PCT/KR2023/004998 2022-11-24 2023-04-13 Appareil de combustion à faible pollution capable de réguler le débit de recirculation interne d'un gaz de combustion WO2024111762A1 (fr)

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Application Number Priority Date Filing Date Title
KR10-2022-0159529 2022-11-24
KR1020220159529A KR102646199B1 (ko) 2022-11-24 2022-11-24 연소가스의 내부재순환 유량 조절이 가능한 저공해 연소장치

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100796768B1 (ko) * 2007-01-25 2008-01-22 한국코로나 주식회사 연소온도 저감에 의한 저 질소산화물 발생용 가스버너
KR20190109860A (ko) * 2018-03-19 2019-09-27 한국생산기술연구원 예혼합 및 확산화염 형성을 통한 저질소산화물 연소장치
KR102115576B1 (ko) * 2018-11-30 2020-05-27 한국생산기술연구원 초저질소산화물 연소장치
KR102243080B1 (ko) * 2020-08-27 2021-04-21 주식회사 수국 저녹스 버너
JP2022091595A (ja) * 2020-12-09 2022-06-21 川崎重工業株式会社 バーナ及びその制御方法、並びに、燃焼炉

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101512352B1 (ko) 2013-11-12 2015-04-23 한국생산기술연구원 연소가스의 내부 재순환을 통한 초저질소산화물 연소장치 및 이의 운전방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100796768B1 (ko) * 2007-01-25 2008-01-22 한국코로나 주식회사 연소온도 저감에 의한 저 질소산화물 발생용 가스버너
KR20190109860A (ko) * 2018-03-19 2019-09-27 한국생산기술연구원 예혼합 및 확산화염 형성을 통한 저질소산화물 연소장치
KR102115576B1 (ko) * 2018-11-30 2020-05-27 한국생산기술연구원 초저질소산화물 연소장치
KR102243080B1 (ko) * 2020-08-27 2021-04-21 주식회사 수국 저녹스 버너
JP2022091595A (ja) * 2020-12-09 2022-06-21 川崎重工業株式会社 バーナ及びその制御方法、並びに、燃焼炉

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