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WO2020221366A1 - Ensemble de combustion et poêle mural - Google Patents

Ensemble de combustion et poêle mural Download PDF

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Publication number
WO2020221366A1
WO2020221366A1 PCT/CN2020/088526 CN2020088526W WO2020221366A1 WO 2020221366 A1 WO2020221366 A1 WO 2020221366A1 CN 2020088526 W CN2020088526 W CN 2020088526W WO 2020221366 A1 WO2020221366 A1 WO 2020221366A1
Authority
WO
WIPO (PCT)
Prior art keywords
flue gas
burner
ejector
return pipe
gas
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.)
Ceased
Application number
PCT/CN2020/088526
Other languages
English (en)
Chinese (zh)
Inventor
陆旭
寿利萍
赵光军
梁国荣
彭晶
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.)
Midea Group Co Ltd
Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Original Assignee
Midea Group Co Ltd
Wuhu Midea Kitchen and Bath Appliances Manufacturing 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 Midea Group Co Ltd, Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd filed Critical Midea Group Co Ltd
Publication of WO2020221366A1 publication Critical patent/WO2020221366A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/045—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with a plurality of burner bars assembled together, e.g. in a grid-like arrangement
    • 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • 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
    • 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
    • F23D14/62—Mixing devices; Mixing tubes
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/007—Mixing tubes, air supply regulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Definitions

  • This application relates to the technical field of water heaters, and more specifically, to a combustion assembly and a wall-hung boiler.
  • Patent No. 201710314570.1 discloses a high-efficiency flue gas circulation system.
  • flue gas is directly fed into a burner for secondary combustion.
  • This application aims to solve one of the above technical problems at least to a certain extent.
  • this application proposes a combustion assembly, which can reduce harmful gas emissions.
  • This application also proposes a wall-hung boiler with the above combustion assembly that is safe, environmentally friendly, and less polluting.
  • the combustion assembly of the embodiment of the present application includes: a gas nozzle connected to an external gas source to provide gas to the combustion device; a flue gas ejector connected to the gas nozzle; a combustor, an air inlet of the combustor Connected with the outlet of the flue gas ejector, an air ejection port is arranged between the burner inlet and the outlet of the flue gas ejector; a flue gas return pipe, one end of the flue gas return pipe is connected to the The burner is in communication, and the other end is in communication with the flue gas ejector to guide the flue gas generated by the burner to the flue gas ejector for premixing with the gas.
  • the combustion assembly of the embodiment of the present application after premixing the flue gas and fuel gas in the flue gas ejector, they are introduced into the combustor, and at the same time, the combustion-supporting air is introduced, so that the combustion gas is combusted in a flameless manner, reducing nitrogen The emissions of oxygen compounds.
  • the flue gas ejector is connected to the gas nozzle in a sealed manner, so that the gas and flue gas are premixed in the flue gas ejector to isolate air.
  • a flow regulating valve is provided on the flue gas return pipe to adjust the flue gas return flow.
  • one end of the flue gas return pipe connected to the burner is a smoke taking end
  • one end of the flue gas return pipe connected to the smoke ejector is an ejector end
  • a strong exhaust fan is arranged between the smoke extraction end of the flue gas return pipe and the burner, and the air outlet of the strong exhaust fan is in communication with the smoke extraction end of the flue gas return pipe.
  • a strong blower is provided at the outlet of the flue gas ejector and the air inlet of the combustor, and the air outlet of the strong blower is in communication with the outlet of the flue gas ejection pipe to direct the The burner inlet provides air.
  • a smoke collecting hood is provided between the smoke taking end of the flue gas return pipe and the burner, and the smoke taking end is in communication with the smoke collecting hood.
  • the mixing ratio of flue gas and fuel gas in the flue gas ejector is 1:1-10:1.
  • the outlet diameter of the flue gas ejector is smaller than the inlet pipe diameter of the burner.
  • the distance between the flue gas ejector and the burner inlet is less than 10CM.
  • the flue gas return pipe is located outside the burner and extends from top to bottom.
  • the return smoke pipe is a corrugated metal pipe.
  • the flue gas return pipe is provided with a flow regulating valve and a thermostat, and when the thermostat detects that the temperature of the flue gas is higher than a set value, the flow regulating valve is closed, so The flue gas return pipe stops delivering flue gas to the flue gas ejector.
  • the wall-hung boiler according to the embodiment of the present application includes the combustion assembly of the above-mentioned embodiment. Since the combustion assembly according to the embodiment of the present application emits less nitrogen oxides, the environmental pollution is reduced. Therefore, the wall-hung boiler according to the embodiments of the present application has low pollution, is safe and environmentally friendly.
  • Figure 1 is a schematic structural diagram of a flue gas recycling system according to some embodiments of the present application.
  • Figure 2 is a schematic structural diagram of a flue gas recycling system according to other embodiments of the present application.
  • Combustion component 100 Combustion component 100;
  • Gas nozzle 10 gas ejector 20;
  • Burner 30 air injection port 40; flue gas return pipe 50; flow control valve 60;
  • the inventor has found in multiple combustion tests that the mixed gas composed of fuel gas, combustion air and flue gas can be burned in a flameless manner. Compared with flame combustion, the harmful gases emitted by flameless combustion are greatly reduced.
  • the inventor further found that the degree of mixing of gas and flue gas is related to the emission of harmful gases in the flue gas. The more uniform the mixture of gas and flue gas, the less harmful gas emissions are.
  • the present application strives to provide a combustion assembly 100 that can be sent into the combustor 30 for combustion after the gas and flue gas are fully mixed in advance.
  • the combustion assembly 100 includes: a gas nozzle 10, a gas ejector 20, a burner 30, and a flue gas return pipe 50.
  • the gas nozzle 10 is connected with an external gas source to provide gas to the combustion equipment.
  • a gas distribution rod and a gas proportional valve are arranged between the gas nozzle 10 and the external gas source, and the gas injection volume and injection pressure are controlled by the gas proportional valve and the gas distribution rod.
  • the flue gas ejector is in communication with the gas nozzle 10. That is, the gas nozzle 10 injects gas into the flue gas ejector in advance.
  • the air inlet of the combustor 30 is in communication with the outlet of the smoke ejector, and an air ejection port 40 is provided between the air inlet of the combustor 30 and the outlet of the smoke ejector.
  • One end of the flue gas return pipe 50 is in communication with the burner 30, and the other end is in communication with the flue gas ejector to guide the flue gas generated by the burner 30 to the flue gas ejector for premixing with the gas.
  • the flue gas and fuel gas of the combustion assembly 100 are pre-mixed in the flue gas ejector before entering the combustor 30.
  • the flue gas ejector and the combustor 30 are two relatively independent chambers.
  • the mixed gas of fuel gas and flue gas (smoke gas for short) is introduced into the combustor 30 again.
  • the air is synchronously introduced into the combustor 30 through the air injection port 40 to participate in the combustion.
  • the gas and flue gas entering the combustor 30 basically include two processes.
  • One is the process of mixing gas and flue gas, which is specifically as follows.
  • the gas nozzle 10 injects gas at a high speed, and a negative pressure is formed in the flue gas ejector.
  • the flue gas is quickly sucked into the flue gas ejector and fully mixed with the gas; second, the mixing process of the mixed gas of flue gas and gas (referred to as the combustion gas) and the combustion air, as follows, the combustion gas is injected To the burner 30, a negative pressure is formed in the burner 30 at the same time, and enough combustion air is sucked in from the air injection port 40, and finally a uniform mixture of flue gas, combustion air and fuel gas (abbreviated as Combustion gas), the combustion gas burns on the surface of the burner 30 to produce a relatively low-temperature oxygen-lean flame. Since the combustion conditions of the flame are in a low-temperature and oxygen-lean state, the formation of nitrogen oxides is effectively suppressed and the smoke is greatly reduced. The emission of nitrogen oxides in the gas.
  • the combustion assembly 100 of the present application is sequentially configured with a flue gas ejector, a burner 30 and a flue gas return pipe 50 in the flow direction of the airflow, thereby achieving the purpose of secondary ejection and secondary mixing, and finally obtains
  • the uniformly mixed combustion gas realizes the flameless combustion of the combustion gas under oxygen-lean conditions, producing a relatively low-temperature flame and reducing the emission of nitrogen oxides.
  • combustion assembly 100 of the embodiment of the present application after premixing the flue gas and fuel gas in the flue gas ejector, they are introduced into the combustor 30, and at the same time, combustion-supporting air is introduced, so that the combustion gas is flameless Way to burn, reducing the emission of nitrogen oxides.
  • the flue gas ejector is sealed to the gas nozzle 10 so as to isolate the air when the gas and flue gas are premixed in the flue gas ejector. That is, the flue gas ejector is isolated from the outside air source, and air is not introduced into the flue gas ejector. In this way, it is ensured that the gas and flue gas in the flue gas ejector are controlled in an appropriate ratio for premixing, and the gas and smoke The gas is thoroughly mixed and uniform.
  • a flow regulating valve 60 is provided on the flue gas return pipe 50 to adjust the flue gas return flow.
  • the flow control valve 60 regulates the amount of smoke entering the smoke ejector. As a result, it is ensured that an appropriate amount of smoke is obtained in the smoke ejector, and the intake ratio of smoke and gas is effectively adjusted.
  • the end of the flue gas return pipe 50 that is connected to the burner 30 is the smoke taking end
  • the end of the flue gas return pipe 50 that is connected to the smoke ejector is the ejection end. That is, the flue gas generated by the burner 30 is introduced into the flue gas return pipe 50 through the smoke-taking end, and the flue gas is released into the flue gas ejector through the emission end.
  • the flue gas return pipe 50 is a communication pipe connecting the burner 30 and the flue gas ejector. The on-off and opening of the flue gas return pipe 50 determine the amount of flue gas entering the flue gas ejector.
  • a strong exhaust fan 71 is provided between the smoke extraction end of the flue gas return pipe 50 and the burner 30, and the air outlet of the strong exhaust fan 71 and the smoke extraction end of the flue gas return pipe 50 are provided. Connected. That is, the flue gas in the combustor 30 is drawn out by the forced exhaust fan 71, and a part of the flue gas enters the flue gas return pipe 50 from the fume extraction end, and is then directed into the flue gas ejector to mix with the gas.
  • the outlet of the flue gas ejector and the air inlet of the combustor 30 are provided with a strong blower, and the air outlet of the strong blower is connected with the outlet of the flue gas ejection pipe to connect to the burner 30
  • the air inlet provides air. In this way, the smoke gas is introduced into the combustor 30, and the air is drawn into the burner 30 through the air injection port 40 under the suction of the strong blower.
  • a smoke collecting hood 80 is provided between the smoke taking end of the flue gas return pipe 50 and the burner 30, and the smoke taking end is in communication with the smoke collecting hood 80.
  • the flue gas is collected in the chamber defined by the fume collecting hood 80, the flue gas is cooled in the fume collecting hood 80, and is drawn out by the forced exhaust fan 71, and part of the flue gas flows back through the flue gas return pipe 50 Into the flue gas ejector, participate in the secondary combustion.
  • the forced exhaust fan 71 is arranged on the smoke collecting hood 80.
  • the flue gas flows into the flue gas ejector after cooling down through the fume collecting hood 80 and the flue gas return pipe 50.
  • the flue gas can be effectively cooled before entering the combustor 30, so that the reaction temperature of the combustion gas is relatively low, and the lower temperature and oxygen-poor reaction gas is more unfavorable to the production of nitrogen oxides. Thereby effectively reducing harmful gas emissions.
  • the inventor found that when the mixing ratio of flue gas and gas in the flue gas ejector is controlled between 1:1 and 10:1, the combustor 30 emits less harmful gas. That is, the content of smoke in a unit of smoke gas is greater than or equal to the content of fuel gas.
  • the mixing ratio of smoke and fuel gas is 1:1, 2:1, 3:1, 4:1, 5:1, 6: 1, 7:1, 8:1, 9:1 or 10:1. It is understandable that the above is only illustrative and not a limitation on the mixing ratio of flue gas and gas.
  • the mixing ratio of flue gas and gas is also It may be other ratios not shown, as long as it is within the above-mentioned interval.
  • the outlet diameter of the flue gas ejector is smaller than the inlet pipe diameter of the combustor 30. That is, the flue gas flow channel of the flue gas ejector is smaller than that of the combustor 30. That is to say, during the flow of the flue gas, the unit flow area changes from small to large, and the sudden change of the unit flow area can be further Promote the mixing degree of flue gas and fuel gas, ensure that the combustion gas is fully burned, and reduce the emission of harmful gases.
  • the distance between the flue gas ejector and the inlet of the burner 30 is less than 10CM.
  • the flue gas ejector and the inlet of the burner 30 can be arranged at intervals to form an air ejection port 40.
  • the distance d between the flue gas ejector and the inlet of the burner 30 is between 0-10 cm. Between, for example, 1 cm, 2 cm, 3 cm, 4 cm, 5 cm, 6 cm, 7 cm, 8 cm, 9 cm or 10 cm.
  • the outlet of the gas ejector 20 may also be provided with a smoke pipe, which extends into the burner 30, and a plurality of air ejection ports 40 are formed on the pipe wall of the smoke pipe.
  • the advantage of using the air injection port 40 to introduce the combustion-supporting air is that the combustion-supporting air can be divided into multiple small airflows and introduced into the mixed gas of the fuel gas and the flue gas, thereby further improving the uniformity of the mixing of the flue gas, the fuel gas and the combustion-supporting air.
  • the flue gas return pipe 50 is located outside the combustor 30 and extends from top to bottom. That is to say, the return flue gas pipe and the burner 30 are arranged separately, so that almost no heat exchange occurs between the burner 30 and the flue gas return pipe 50, thereby making the flue gas temperature in the flue gas return pipe 50 better. Cool down well, so that flue gas with proper temperature can be delivered to the flue gas ejector.
  • the flue gas return pipe 50 is a corrugated metal pipe.
  • the flue gas return pipe 50 made of metal material has good thermal properties and a large heat dissipation area, thereby effectively reducing the temperature of the flue gas.
  • the inventor found in his research that when the temperature of the flue gas is too high, the harmful gas emitted by the burner 30 is higher than that during normal combustion (that is, when the flue gas is not introduced). Therefore, for The temperature control of flue gas is very important.
  • a flow regulating valve 60 and a thermostat 90 are provided on the flue gas return pipe 50. When the temperature controller 90 detects that the temperature of the flue gas is higher than the set value, the flow regulating valve 60 is closed and the flue gas return pipe 50 Stop delivering flue gas to the flue gas ejector. In this way, when the temperature of the flue gas is too high, the delivery of flue gas to the flue gas ejector is stopped.
  • the wall-hung boiler according to the embodiment of the present application includes the combustion assembly 100 of the above-mentioned embodiment. Since the combustion assembly 100 according to the embodiment of the present application emits less nitrogen and oxygen compounds, the pollution to the environment is reduced. Therefore, the wall-hung boiler according to the embodiments of the present application has low pollution, is safe and environmentally friendly.

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

Abstract

L'invention concerne un ensemble de combustion (100) et un poêle mural comprenant l'ensemble de combustion (100). L'ensemble de combustion (100) comprend : une buse de gaz (10) reliée à une source de gaz externe et fournissant du gaz combustible pour un dispositif de combustion ; un éjecteur de fumée (20) en communication avec la buse de gaz (10) ; un brûleur (30), une entrée de gaz du brûleur (30) étant en communication avec une sortie de l'éjecteur de fumée (20) et un orifice d'éjection d'air (40) étant prévu entre l'entrée de gaz du brûleur (30) et la sortie de l'éjecteur de fumée (20) ; et un tuyau de retour de fumée (50), une extrémité du tuyau de retour de fumée (50) étant en communication avec le brûleur (30) et l'autre extrémité de celui-ci étant en communication avec l'éjecteur de fumée (20), de telle sorte que la fumée générée par le brûleur (30) est guidée vers l'éjecteur de fumée (20) et est pré-mélangée avec le gaz combustible. Selon l'ensemble de combustion (100), la fumée et le gaz combustible sont pré-mélangés dans l'éjecteur de fumée (20) et sont ensuite éjectés dans le brûleur (30) et, en même temps, l'air de combustion est introduit, de telle sorte que le gaz de combustion brûle de manière sans flamme, ce qui permet de réduire l'émission d'oxynitrures.
PCT/CN2020/088526 2019-04-30 2020-04-30 Ensemble de combustion et poêle mural Ceased WO2020221366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910364071.2A CN111853784A (zh) 2019-04-30 2019-04-30 燃烧组件和壁挂炉
CN201910364071.2 2019-04-30

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WO2020221366A1 true WO2020221366A1 (fr) 2020-11-05

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CN114251655B (zh) * 2021-11-23 2023-05-30 上海工程技术大学 一种分段循环燃气低氮燃烧器
CN116428735A (zh) * 2022-01-04 2023-07-14 广东万和新电气股份有限公司 箱式燃气加热装置
CN116428746B (zh) * 2022-01-04 2025-11-14 广东万和新电气股份有限公司 燃烧装置及燃气热水设备
CN117006694B (zh) * 2022-04-27 2025-11-21 芜湖美的厨卫电器制造有限公司 燃气热水器

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WO2005070586A1 (fr) * 2004-01-07 2005-08-04 Xudong Zhu Dispositif de rechauffement de sable de fonderie
CN201339977Y (zh) * 2008-12-01 2009-11-04 楼洋 一种具有烟气再循环的家庭用燃气炉具
CN103335311A (zh) * 2013-06-13 2013-10-02 广东新明珠陶瓷集团有限公司 涡引高效助燃喷枪
KR20150039910A (ko) * 2013-10-04 2015-04-14 김정혜 매연저감장치용 청소장치
CN104964312A (zh) * 2015-07-02 2015-10-07 山东建筑大学 回热节能燃气灶
CN106152136A (zh) * 2016-08-26 2016-11-23 佛山市科皓燃烧设备制造有限公司 燃气引射超低NOx燃料稀释技术蓄热式烧嘴
CN106152479A (zh) * 2016-08-26 2016-11-23 芜湖美的厨卫电器制造有限公司 燃气热水器
CN107120837A (zh) * 2017-05-06 2017-09-01 广东万家乐燃气具有限公司 一种高效烟气循环系统及其燃气热水器

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