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WO2020221366A1 - 燃烧组件和壁挂炉 - Google Patents

燃烧组件和壁挂炉 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)
French (fr)
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/zh
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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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

一种燃烧组件（100）和包括该燃烧组件（100）的壁挂炉，燃烧组件（100）包括：燃气喷嘴（10），与外部气源连接，向燃烧设备提供燃气；烟气引射器（20），与燃气喷嘴（10）连通；燃烧器（30），燃烧器（30）的进气口与烟气引射器（20）的出口连通，燃烧器（30）的进气口与烟气引射器（20）的出口之间设置空气引射口（40）；烟气回流管（50），烟气回流管（50）一端与燃烧器（30）连通，另一端与烟气引射器（20）连通，以将燃烧器（30）产生的烟气引流至烟气引射器（20）与燃气进行预混。该燃烧组件（100），将烟气和燃气在烟气引射器（20）内预混之后，被引射入燃烧器（30）内，同时将助燃空气引入，使得燃烧气体以无焰方式燃烧，减少了氮氧化合物的排放量。

Description

燃烧组件和壁挂炉
相关申请的交叉引用
本申请基于申请号为：201910364071.2，申请日为2019年4月30日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本申请涉及热水器技术领域，更具体地，涉及一种燃烧组件和壁挂炉。
背景技术
壁挂炉燃烧过程中会向外界排放CO、NOx等有害气体，不仅污染环境而且极易对人身安全带来危险。
专利号201710314570.1公开了一种高效烟气循环系统，该专利文献中将烟气直接送进燃烧器内进行二次燃烧。
发明人在研究中发现，若将烟气直接送进燃烧器燃烧(即燃气与烟气没有充分混匀的情况送入燃烧器)，不仅会使得燃烧器燃烧不稳定，且无法有效减少有害气体的排放。
发明内容
本申请旨在至少在一定程度上解决上述技术问题之一。
为此，本申请提出一种燃烧组件，该燃烧组件的可以减少有害气体的排放。
本申请还提出一种具有上述燃烧组件的壁挂炉安全环保、污染小。
本申请实施例的燃烧组件包括：燃气喷嘴，与外部气源连接，向所述燃烧设备提供燃气；烟气引射器，与所述燃气喷嘴连通；燃烧器，所述燃烧器的进气口与所述烟气引射器出口连通，所述燃烧器进气口与所述烟气引射器出口之间设置空气引射口；烟气回流管，所述烟气回流管一端与所述燃烧器连通，另一端与所述烟气引射器连通，以将所述燃烧器产生的烟气引流至所述烟气引射器与燃气进行预混。
本申请实施例的燃烧组件，将烟气和燃气在烟气引射器内预混之后，被引射入燃烧器内，同时将助燃空气引入，使得燃烧气体以无焰方式燃烧，减少了氮氧化合物的排放量。
根据本申请的一些实施例，所述烟气引射器与所述燃气喷嘴密封连接，以使所述燃气和烟气在所述烟气引射器中进行预混时隔离空气。
可选实施例中，所述烟气回流管上设置流量调节阀，以调整烟气回流流量。
根据本申请的一些实施例，所述烟气回流管连通燃烧器的一端为取烟端，所述烟气回流管连通所述烟气引射器的一端为引射端。
可选实施例中，所述烟气回流管的取烟端与所述燃烧器之间设置强抽风机，所述强抽风机的出风口与所述烟气回流管的取烟端连通。
可选实施例中，所述烟气引射器的出口与所述燃烧器进气口设置强鼓风机，所述强鼓风机的出风口与所述烟气引射管的出口连通，以向所述燃烧器进气口提供空气。
可选实施例中，所述烟气回流管的取烟端与所述燃烧器之间设置集烟罩，所述取烟端与所述集烟罩连通。
根据本申请的一些实施例，所述烟气引射器中烟气与燃气的混合比例为1:1-10:1。
根据本申请的一些实施例，所述烟气引射器的出口口径小于所述燃烧器的进口管径。
根据本申请的一些实施例，所述烟气引射器与所述燃烧器进口之间的距离小于10CM。
根据本申请的一些实施例，所述烟气回流管位于所述燃烧器的外侧且自上向下延伸。
可选实施例中，所述回流烟管为波纹金属管。
进一步可选示例中，所述烟气回流管上设有流量调节阀和温控器，当所述温控器检测到烟气的温度高于设定值时，所述流量调节阀关闭，所述烟气回流管停止向所述烟气引射器输送烟气。
根据本申请实施例的壁挂炉包括上述实施例的燃烧组件，由于根据本申请实施例的燃烧组件排放的氮氧化合物少，降低了对环境的污染。因此，根据本申请实施例的壁挂炉的污染小，安全环保。
本申请的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。
附图说明
本申请的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1是根据本申请一些实施例的烟气循环利用系统的结构示意图；
图2是根据本申请另一些实施例的烟气循环利用系统的结构示意图。
附图标记：
燃烧组件100；
燃气喷嘴10；燃气引射器20；
燃烧器30；空气引射口40；烟气回流管50；流量调节阀60；
强抽风机71；强鼓风机72；
集烟罩80；温控器90。
具体实施方式
下面详细描述本申请的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本申请，而不能理解为对本申请的限制。
发明人在多次燃烧试验中发现，燃气、助燃空气和烟气组成的混合气体可以以无焰方式燃烧，相比于有焰燃烧而言，无焰燃烧所排放有害气体大大减少。
发明人进一步发现，燃气和烟气的混合程度与烟气有害气体排放量相关，燃气和烟气的混合越均匀，有害气体排放量越少。
因此，本申请着力提供一种燃烧组件100，该燃烧组件100可以在燃气和烟气预先充分混合之后，再送入燃烧器30内燃烧。
参照图1-图2，描述根据本申请实施例的燃烧组件100，如图1和图2所示，燃烧组件100包括：燃气喷嘴10、燃气引射器20、燃烧器30和烟气回流管50。
具体地，燃气喷嘴10与外部气源连接，从而向燃烧设备提供燃气。燃气喷嘴10与外部气源之间设有分气杆和燃气比例阀，通过燃气比例阀和分气杆调控燃气的喷射量及喷射压力。
烟气引射器与燃气喷嘴10连通。即燃气喷嘴10将燃气预先喷射入烟气引射器内。
燃烧器30的进气口与烟气引射器出口连通，燃烧器30进气口与烟气引射器出口之间设置空气引射口40。烟气回流管50一端与燃烧器30连通，另一端与烟气引射器连通，以将燃烧器30产生的烟气引流至烟气引射器与燃气进行预混。
也就是说，该燃烧组件100的烟气和燃气在进入燃烧器30之前在烟气引射器内预先混合，烟气引射器与燃烧器30为两个相对独立的腔室，预混后燃气和烟气的混合气体(简称燃烟气体)再次被引射入燃烧器30内。其中，空气通过空气引射口40被同步引入燃烧器30内参与燃烧。
其中，燃气和烟气进入燃烧器30基本上包括两个过程，其一，燃气和烟气混合的过程，具体如下，燃气喷嘴10高速喷射燃气，此时在烟气引射器内形成负压，烟气被快速吸入烟气引射器内与燃气充分混合；其二，烟气和燃气的混合气体(简称燃烟气体)与助燃空气的混合过程，具体如下，燃烟气体被喷射到燃烧器30，同时在燃烧器30内形成负压，并从空气引射口40吸入足够的助燃空气，并最终在燃烧器30内形成均匀的烟气、助燃空气和燃气的混合气体(简称燃烧气体)，燃烧气体在燃烧器30表面火孔燃烧，产生相对低温的贫氧火 焰，由于火焰的燃烧条件处于低温、贫氧状态，因此，有效抑制了氮氧化合物的生成，大幅度降低烟气的氮氧化合物的排放量。
可以理解的是，本申请的燃烧组件100在气流流动方向上依次配置烟气引射器、燃烧器30和烟气回流管50，从而实现了二级引射和二次混合的目的，最终获得混合均匀的燃烧气体，实现了燃烧气体在贫氧条件以无焰方式燃烧，产生相对低温的火焰，降低了氮氧化合物的排放量。
简言之，本申请实施例的燃烧组件100，将烟气和燃气在烟气引射器内预混之后，被引射入燃烧器30内，同时将助燃空气引入，使得燃烧气体以无焰方式燃烧，减少了氮氧化合物的排放量。
在本申请的一些实施例中，如图1和图2所示，烟气引射器与燃气喷嘴10密封连接，以使燃气和烟气在烟气引射器中进行预混时隔离空气。即烟气引射器与外界空气气源隔绝，不导入空气至烟气引射器内，如此，保证烟气引射器内燃气和烟气被控制在适当比例进行预混，保证燃气和烟气被充分混合均匀。
可选地，烟气回流管50上设置流量调节阀60，以调整烟气回流流量。通过流量调节阀60调控烟气引射器的进烟量。由此，保证烟气引射器内获得适量的烟气，有效调节烟气和燃气的进气比例。
其中，烟气回流管50连通燃烧器30的一端为取烟端，烟气回流管50连通烟气引射器的一端为引射端。即通过取烟端将燃烧器30产生的烟气引入烟气回流管50内，并通过引射端将烟气释放至烟气引射器内。换言之，烟气回流管50为连通燃烧器30与烟气引射器的连通管。烟气回流管50的通断及开度大小，决定进入烟气引射器内的烟气量。
可选实施例中，如图1所示，烟气回流管50的取烟端与燃烧器30之间设置强抽风机71，强抽风机71的出风口与烟气回流管50的取烟端连通。即通过强抽风机71将燃烧器30内的烟气抽出，且一部分烟气从取烟端进入烟气回流管50内，接着被引射至烟气引射器内与燃气混合。
可选实施例中，如图2所示，烟气引射器的出口与燃烧器30进气口设置强鼓风机，强鼓风机的出风口与烟气引射管的出口连通，以向燃烧器30进气口提供空气。这样，燃烟气体被引射入燃烧器30的同事，空气在强鼓风机抽吸下，穿过空气引射口40引射进入燃烧器30内。
进一步可选示例中，烟气回流管50的取烟端与燃烧器30之间设置集烟罩80，取烟端与集烟罩80连通。在该实施例中，烟气被收集于集烟罩80所限定的腔室内，烟气在集烟罩80内降温，并被强抽风机71引出，其中一部分烟气经过烟气回流管50回流至烟气引射器内，参与二次燃烧。其中，一些实施例中，强抽风机71设置于集烟罩80上。
可以理解的是，烟气经过集烟罩80和烟气回流管50降温之后，再流入烟气引射器内。这样，可以燃烟气体在进入燃烧器30之前被有效地降温，从而使得燃烧气体的反应温度也相对较低，而较低温度且贫氧的反应气体，更不利于氮氧化合物的产生，从而有效减少有害气体的排放量。
可选示例中，发明人研究发现，将烟气引射器中烟气与燃气的混合比例控制在1:1-10:1之间时，燃烧器30排放的有害气体较少。即单位燃烟气体中烟气的含量大于或等于燃气的含量，例如，烟气与燃气的混合比例为1:1、2:1、3:1、4:1、5:1、6:1、7:1、8:1、9:1或10:1，可以理解的是，上述仅是示意性的，并不是对烟气与燃气混合比例的限制，烟气与燃气的混合比例也可以为其他未示意出的比例，只要上述区间范围内即可。
参照图1和图2所示，烟气引射器的出口口径小于燃烧器30的进口管径。即烟气引射器的燃烟流通通道小于燃烧器30的燃烟流通通道，也就是说，燃烟气体在流动过程中，单位流通面积由小到大，单位流通面积的突变，可以进一步促进烟气和燃气的混合程度，保证燃烧气体被充分燃烧，降低有害气体的排放。
可选实施例中，烟气引射器与燃烧器30进口之间的距离小于10CM。也就是说，烟气引射器与燃烧器30进口可以间隔设置，从而形成空气引射口40，此时，烟气引射器与燃烧器30进口之间的距离d在0-10厘米之间，例如，1厘米、2厘米、3厘米、4厘米、5厘米、6厘米、7厘米、8厘米、9厘米或10厘米。或者燃气引射器20的出口也可以设有燃烟管，燃烟管伸入燃烧器30内，在燃烟管的管壁上形成多个空气引射口40。
利用空气引射口40引入助燃空气的优势在于，可以将助燃空气分成多股小气流引入燃气和烟气的混合气体内，进一步提高烟气、燃气和助燃空气混合的均匀性。
可选示例中，烟气回流管50位于燃烧器30的外侧且自上向下延伸。也就是说，回流烟气管与燃烧器30分开设置，这样，燃烧器30与烟气回流管50之间几乎不发生热交换，由此，使得烟气回流管50内的烟气温度可以更好地降温，从而可以为烟气引射器输送温度适当的烟气。
进一步可选示例中，烟气回流管50为波纹金属管。金属材质制成的烟气回流管50热性好，散热面积较大，由此，有效地降低烟气的温度。
进一步可选示例中，发明人在研究中发现，当烟气的温度过高时，燃烧器30燃烧排放的有害气体，相比于正常燃烧时高(即不通入烟气时)，因此，对于烟气的温度调控显得至关重要。本申请在烟气回流管50上设有流量调节阀60和温控器90，当温控器90检测到烟气的温度高于设定值时，流量调节阀60关闭，烟气回流管50停止向烟气引射器输送烟气。这样，当烟气的温度过高时，停止向烟气引射器输送烟气。
根据本申请实施例的壁挂炉包括上述实施例的燃烧组件100，由于根据本申请实施例的 燃烧组件100排放的氮氧化合物少，降低了对环境的污染。因此，根据本申请实施例的壁挂炉的污染小，安全环保。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本申请的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
尽管上面已经示出和描述了本申请的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本申请的限制，本领域的普通技术人员在不脱离本申请的原理和宗旨的情况下在本申请的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (14)

  1. 一种燃烧组件，其特征在于，包括：
    燃气喷嘴，与外部气源连接，向所述燃烧设备提供燃气；
    烟气引射器，与所述燃气喷嘴连通；
    燃烧器，所述燃烧器的进气口与所述烟气引射器出口连通，所述燃烧器进气口与所述烟气引射器出口之间设置空气引射口；
    烟气回流管，所述烟气回流管一端与所述燃烧器连通，另一端与所述烟气引射器连通，以将所述燃烧器产生的烟气引流至所述烟气引射器与燃气进行预混。
  2. 根据权利要求1所述的燃烧组件，其特征在于，所述烟气引射器与所述燃气喷嘴密封连接，以使所述燃气和烟气在所述烟气引射器中进行预混时隔离空气。
  3. 根据权利要求2所述的燃烧组件，其特征在于，所述烟气回流管上设置流量调节阀，以调整烟气回流流量。
  4. 根据权利要求1～3中任一项所述的燃烧组件，其特征在于，所述烟气回流管连通燃烧器的一端为取烟端，所述烟气回流管连通所述烟气引射器的一端为引射端。
  5. 根据权利要求4所述的燃烧组件，其特征在于，所述烟气回流管的取烟端与所述燃烧器之间设置强抽风机，所述强抽风机的出风口与所述烟气回流管的取烟端连通。
  6. 根据权利要求4所述的燃烧组件，其特征在于，所述烟气引射器的出口与所述燃烧器进气口设置强鼓风机，所述强鼓风机的出风口与所述烟气引射管的出口连通，以向所述燃烧器进气口提供空气。
  7. 根据权利要求4-6中任一项所述的燃烧组件，其特征在于，所述烟气回流管的取烟端与所述燃烧器之间设置集烟罩，所述取烟端与所述集烟罩连通。
  8. 根据权利要求1～7中任一项所述燃烧组件，其特征在于，所述烟气引射器中烟气与燃气的混合比例为1:1-10:1。
  9. 根据权利要求1～8中任一项所述燃烧组件，其特征在于，所述烟气引射器的出口口径小于所述燃烧器的进口管径。
  10. 根据权利要求1～9中任一项所述的燃烧组件，其特征在于，所述烟气引射器与所述燃烧器进口之间的距离小于10CM。
  11. 根据权利要求1～10中任一项所述的燃烧组件，其特征在于，所述烟气回流管位于所述燃烧器的外侧且自上向下延伸。
  12. 根据权利要求11所述的燃烧组件，其特征在于，所述烟气回流管为波纹金属管。
  13. 根据权利要求3所述的燃烧组件，其特征在于，所述烟气回流管上设有流量调节 阀和温控器，当所述温控器检测到烟气的温度高于设定值时，所述流量调节阀关闭，所述烟气回流管停止向所述烟气引射器输送烟气。
  14. 一种壁挂炉，其特征在于，包括权利要求1-6或8-13中任一项所述的燃烧组件。
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