WO2020259577A1 - 一种低氮氧化物排放的燃烧器 - Google Patents

一种低氮氧化物排放的燃烧器 Download PDF

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WO2020259577A1
WO2020259577A1 PCT/CN2020/098077 CN2020098077W WO2020259577A1 WO 2020259577 A1 WO2020259577 A1 WO 2020259577A1 CN 2020098077 W CN2020098077 W CN 2020098077W WO 2020259577 A1 WO2020259577 A1 WO 2020259577A1
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flue gas
channel
combustion
circulating flue
fuel
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PCT/CN2020/098077
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English (en)
French (fr)
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方振明
陈勇强
郑向阳
陈伟
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浙江先创能源科技股份有限公司
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Publication of WO2020259577A1 publication Critical patent/WO2020259577A1/zh

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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 
    • F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
    • F23C5/08—Disposition of burners
    • 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
    • F23D14/46—Details, e.g. noise reduction means
    • 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
    • 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
    • F23D14/64—Mixing devices; Mixing tubes with injectors
    • 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
    • F23D14/70—Baffles or like flow-disturbing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L5/00—Blast-producing apparatus before the fire
    • F23L5/02—Arrangements of fans or blowers

Definitions

  • the invention belongs to the technical field of environmentally friendly combustion, and particularly relates to a low nitrogen oxide emission
  • Natural gas is a well-known clean fuel, but natural gas combustion produces a large amount of NO x emissions, and NO x is the most important pollutant of natural gas boilers.
  • NO x is the most important pollutant of natural gas boilers.
  • my country's environmental protection departments are increasingly demanding the emission of pollutants from pulverized coal combustion. For this reason, reducing nitrogen oxide emissions is one of the main goals of the current design of the pulverized coal boiler combustion system.
  • Gas boilers that do not adopt any low-nitrogen measures can achieve NOx emissions as high as 600-800mg/Nm 3 , and existing low-nitrogen gas burners can achieve NO x ⁇ 200mg/Nm 3 .
  • the existing gas-fired boilers can generally achieve NO x emissions ⁇ 80mg.
  • NO x emissions ⁇ 80mg.
  • the temperature in the furnace is as low as possible and the possible high temperature areas are reduced, especially due to changes in the flow field.
  • the local high temperature zone It is necessary to have a relatively uniform combustion area to ensure the combustion of fuel and reduce the maximum temperature of the flame.
  • Fuel-based NO X decreases with the decrease of excess air coefficient.
  • Fuel-based NO X is closely related to the pyrolysis products of fuel and the oxygen concentration in the flame. If the combustion center lacks oxygen in the main combustion zone, most of it Volatile nitrogen and part of the coke N are converted into N 2 , thereby reducing NO x in the flue gas.
  • the method of flue gas recirculation that has been commonly used in boiler combustion systems is to use external or internal fans to draw low-temperature circulating flue gas into the combustion chamber flame to participate in combustion.
  • the recirculated flue gas and combustion-supporting The air flow is unevenly mixed and cannot effectively reduce the temperature in the furnace. The flue gas stays in the furnace for a short time.
  • the present invention designs the layout of the fuel channel, the circulating smoke channel and the combustion-supporting air channel inside the combustor.
  • the combustion-supporting air channel is surrounded by the circulating smoke, and the circulating smoke is mixed with the combustion-supporting air to reduce the oxygen content of the combustion-supporting air. reducing the excess air, fuel combustion ⁇ ⁇ 1 in a reducing atmosphere, the flue gas can greatly reduce the NO X.
  • the fuel passage is surrounded by circulating flue gas, the flue gas is mixed with fuel cycle, for reducing the ignition temperature, as the temperature decreases, the heat generation amount of NO x is reduced type.
  • a burner with low nitrogen oxide emissions includes a central fuel channel, a first combustion-supporting air channel is arranged around the outer circumference of the central fuel channel, and a first circulating flue gas channel is arranged around the outer circumferential direction of the first combustion-supporting air channel.
  • a second combustion-supporting air channel is arranged in the outer circumferential direction of the first circulating flue gas channel, a second circulating flue gas channel is arranged around the outer circumferential direction of the second combustion-supporting air channel, and a third circulation is arranged around the outer circumferential direction of the second circulating flue gas channel Flue gas channel
  • a first series of fuel spray guns are arranged in the first circulating flue gas channel, and a second series of fuel spray guns are arranged in the third circulating flue gas channel.
  • the central fuel channel, the first combustion-supporting air channel, the first circulating flue gas channel, the second combustion-supporting air channel, the second circulating flue gas channel, the third circulating flue gas channel, the first series of fuel spray guns, and the second series of fuel is on the same plane.
  • the central fuel passage is a metal pipe, and a regulating valve is installed at the entrance of the central fuel passage, and the outlet fuel can be used as a constant light to keep burning to ensure that the furnace flame does not go out.
  • the cross section of the first combustion-supporting air passage is a circular ring centered on the central fuel passage, the inlet of the first combustion-supporting air passage is connected to a combustion-supporting air source, and the outlet is provided with a mixing wind wheel.
  • the cross section of the first circulating flue gas channel is a circular ring with the central fuel channel as the center.
  • the first series of fuel spray guns are equidistantly arranged in the first circulating flue gas channel along the circular direction, and the inlet of the first circulating flue gas channel Connect the circulating flue gas.
  • the cross section of the second combustion-supporting air channel is a circular ring with the central fuel channel as the center, the inlet of the second combustion-supporting air channel is connected with the combustion-supporting air source, and the outlet is provided with a mixing wind wheel.
  • the cross section of the second circulating flue gas channel is a circular ring with the central fuel channel as the center, and the inlet of the second circulating flue gas channel is connected with the circulating flue gas.
  • the cross section of the third circulating flue gas channel is a circular ring centered on the central fuel channel, and the second series of fuel spray guns are equidistantly arranged along the circular direction in the third circulating flue gas channel, and the third circulating flue gas The inlet of the channel is connected with circulating flue gas.
  • the first series of fuel spray guns are composed of circular pipes with equal cross-sections, and the inlet of each spray gun is connected to a fuel source.
  • the second series of fuel spray guns are composed of round pipes with equal cross-sections, and the inlet of each spray gun is connected to a fuel source.
  • the burner is designed with multiple diversion channels for circulating flue gas.
  • the circulating flue gas is actively mixed with fuel, and on the other hand, the circulating flue gas is actively mixed with the combustion-supporting air, and the fuel concentration and the oxygen concentration of the combustion-supporting air are diluted to suppress The combustion speed and concentrated heat release of fuel in the boiler reduce the combustion temperature and reduce the amount of NOx generated.
  • the circulating flue gas is an independent channel, which does not affect the combustion-supporting air channel, the burner resistance is small, and the required combustion-supporting air supply fan consumes less energy.
  • Figure 1 is a schematic cross-sectional view of a burner with low nitrogen oxide emissions
  • a burner with low nitrogen oxide emissions includes a central fuel channel 1, a first combustion-supporting air channel 2 is arranged around the outer circumference of the central fuel channel, and the first combustion-supporting air channel 2 is centered on the central fuel channel
  • the inlet is connected to the combustion-supporting air source, and the outlet is provided with a mixing wind wheel; a first circulating flue gas channel 3 is provided around the outer circumference of the first combustion-supporting air channel 2, and the cross section of the first circulating flue gas channel 3 is centered
  • the fuel channel is a circular ring with a center.
  • a first series of fuel spray guns 7 are equidistantly arranged in the first circulating flue gas channel 3 along the ring direction, and the inlet of the first circulating flue gas channel 3 is connected with the circulating flue gas.
  • a second combustion-supporting air channel 4 is arranged around the outer circumference of the first circulating flue gas 3 channel.
  • the cross-section of the second combustion-supporting air channel 4 is a ring centered on the central fuel channel.
  • the inlet of the second combustion-supporting air channel 4 is connected to the combustion-supporting air channel.
  • the wind source, the outlet is provided with a mixing wind wheel.
  • a second circulating flue gas passage 5 is arranged around the outer circumference of the second combustion-supporting air passage 4, the cross section of the second circulating flue gas passage 5 is a circular ring centered on the central fuel passage, and the inlet of the second circulating flue gas passage 5 Connect the circulating flue gas.
  • a third circulating flue gas channel 6 is arranged around the outer circumference of the second circulating flue gas channel 5, the cross-section of the third circulating flue gas channel 6 is a circular ring centered on the central fuel channel; There are 8 second series of fuel spray guns.
  • the central fuel passage 1 is a metal pipe with a diameter of 20 cm.
  • An electric regulating valve is installed at the entrance of the central fuel passage.
  • the outlet fuel can be used as a beacon to keep burning to ensure that the furnace flame does not go out.
  • the first series of fuel spray guns 7 is composed of 4 to 10 round pipes with equal cross-sections, each of which has a diameter of 0.5 to 5.0 cm, and the inlet of each spray gun is connected to a fuel source.
  • the second series of fuel spray guns 8 are composed of 8-20 round pipes with equal cross-sections, each spray gun has a diameter of 1.0-3.0 cm, and the inlet of each spray gun is connected to a fuel source.
  • a burner with low nitrogen oxide emissions which is fed with combustion-supporting air to ignite the outlet of the central fuel passage 1 and the outlets of the first and second series of fuel spray guns.
  • the outlet fuel can be used as The permanent light keeps burning to ensure that the furnace flame does not go out.
  • the circulating fan sucks the flue gas in the furnace, and adjusts the flow of the circulating flue gas by adjusting the electric regulating valve on the circulating main flue pipe.
  • the first combustion-supporting air channel is surrounded by the first circulating flue gas channel
  • the second combustion-supporting air channel is surrounded by the second combustion air channel.
  • the second circulating flue gas channel is surrounded, so that the circulating flue gas and the combustion-supporting air are fully mixed, and the oxygen content of the combustion-supporting air is reduced.
  • the first series of fuel spray guns are arranged in the first circulation flue, and the second series of fuel spray guns are arranged in the third circulation flue, so that the circulating flue gas and the fuel are fully mixed, and the combustion speed of the fuel is reduced, thereby reducing the temperature.
  • the application of this technology can save energy consumption, reduce NO x emissions, and achieve NO x ⁇ 30mg/Nm 3 under the working conditions of hot air temperature ⁇ 250°C.
  • the flue gas emission per hour is about 22000Nm 3 ; the existing burner technology can only achieve NO x emission ⁇ 80mg Nm 3 under the working condition of hot air temperature ⁇ 250 °C; adopt ultra-low nitrogen burner After that, NO x emission ⁇ 30mg Nm 3 ; NO x emission reduction is about 1.1Kg/h, and the annual NO x emission of a single 25T boiler is reduced by nearly 10 tons.

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

Abstract

一种低氮氧化物排放的燃烧器，包括中心燃料通道（1），围绕中心燃料通道（1）外圆周方向设置有第一助燃风通道（2），围绕第一助燃风通道（2）外圆周方向设置有第一循环烟气通道（3），围绕第一循环烟气通道（3）外圆周方向设置有第二助燃风通道（4），围绕第二助燃风通道（4）外圆周方向设置有第二循环烟气通道（5），围绕第二循环烟气通道（5）外圆周方向设置有第三循环烟气通道（6）；该燃烧器能够降低燃烧温度，降低NO x生成量。

Description

一种低氮氧化物排放的燃烧器 技术领域
本发明属于环保燃烧技术领域，尤其涉及一种低氮氧化物排放
的燃烧器。
背景技术
近年来，我国能源相关部门的氮氧化物排放量快速上升，2000年全国氮氧化物排放量为12.1X106t，到2005年增加到19.1X106t，年均增长10％。如果不采取进一步的减排措施，随着国美经济的发展、人口增长和城市化进程的加快，未来我国的氮氧化物排放量将继续增长，按照目前的发展趋势，到2030年排放量将达到35.4X106t，势必造成严重的环境影响，因此，必须切实加强氮氧化物排放控制。
天然气是众所周知的清洁燃料，但天然气燃烧产生的NO x排放量大，NO x是天然气锅炉的最主要污染物。目前我国环保部门对煤粉燃烧产生的污染物排放要求越来越高。为此，降低氮氧化物排放量是目前煤粉锅炉燃烧系统设计的主要目标之一。
不采用任何低氮措施的燃气锅炉，NOx排放高达600～800mg/Nm 3，现有低氮燃气燃烧器可以实现NO x<200mg/Nm 3。采用炉外烟气再循环措施，现有燃气锅炉一般可实现NO x排放<80mg。但该数值仍然有进一步减低的空间，为降低氮氧化物的排放量，一方面，在锅炉设计中，尽量降低炉膛内的温度并减少可能产生的高温区域，特别是流场变化等原因而产生的局部高温区。要具备相对均匀的燃烧区域来保证燃料的燃烧，降低火焰的最高温度。另一方面，燃料型NO X随过剩空气系数的降低而降低，燃料型NO X与燃料的热解产物和火焰中氧浓度密切相关，如果在主燃烧区燃烧中心缺氧，可使绝大部分挥发份氮和部分焦碳N转化为N 2，从而降低烟气中的NO X。
现有技术中燃烧系统存在如下不足：
目前锅炉燃烧系统已普遍使用的烟气再循环的方法，大多是采用外部或者内部的风机把低温循环烟气抽到燃烧室火焰中参与燃烧，但由于燃烧器设计问题，再循环烟气与助燃空气气流混合不均匀，不能有效降低炉膛内的温度，烟气在炉膛停留时间较短。
发明内容
本发明在燃烧器内部对燃料通道、循环烟通道和助燃风通道的布局设计，一方面，助燃风通道循环烟气包围，循环烟气与助燃风混合，用于降低助燃风的含氧量，降低过剩空气系数，使燃料在α＜1还原气氛中燃烧，能大大降低烟气中的NO X。另一方面 ，燃料通道被循环烟气包围，循环烟气与燃料混合，用于降低着火温度，随着温度的降低，热力型NO x的生成量也降低。
为实现以上目的，本发明采用的技术方案如下：
一种低氮氧化物排放的燃烧器，包括中心燃料通道，围绕中心燃料通道外圆周方向设置有第一助燃风通道，围绕第一助燃风通道外圆周方向设置有第一循环烟气通道，围绕第一循环烟气通道外圆周方向设置有第二助燃风通道，围绕第二助燃风通道外圆周方向设置有第二循环烟气通道，围绕第二循环烟气通道外圆周方向设置有第三循环烟气通道；
第一循环烟气通道内设置有第一系列燃料喷枪，所述第三循环烟气通道内设置有第二系列燃料喷枪。
进一步的，中心燃料通道、第一助燃风通道、第一循环烟气通道、第二助燃风通道、第二循环烟气通道、第三循环烟气通道、第一系列燃料喷枪、第二系列燃料喷枪的出口在同一平面上。
进一步的，中心燃料通道为一根金属管，在中心燃料通道入口安装调节阀，其出口燃料能作为长明灯一直燃烧，确保炉膛火焰不熄灭。
进一步的，第一助燃风通道的横截面为以中心燃料通道为圆心的圆环，第一助燃风通道的进口连接助燃风源，出口设置有混合风轮。
第一循环烟气通道的横截面为以中心燃料通道为圆心的圆环，在第一循环烟气通道内沿圆环方向等距离设置有第一系列燃料喷枪，第一循环烟气通道的进口 连接循环烟气。
进一步的，第二助燃风通道的横截面为以中心燃料通道为圆心的圆环，第二助燃风通道的进口连接助燃风源，出口设置有混合风轮。
进一步的，第二循环烟气通道的横截面为以中心燃料通道为圆心的圆环，第二循环烟气通道的进口连接循环烟气。
进一步的，第三循环烟气通道的横截面为以中心燃料通道为圆心的圆环，在第三循环烟气通道内沿圆环方向等距离设置有第二系列燃料喷枪，第三循环烟气通道的进口连接循环烟气。
优选的，第一系列燃料喷枪由横截面大小相等的圆管组成，各喷枪进口连接燃料源。
优选的，所述第二系列燃料喷枪由横截面大小相等的圆管组成，各喷枪进口连接燃料源。
本发明的有益效果如下：
燃烧器内部设计多股循环烟气的导流通道，一方面，循环烟气主动与燃料混合，另一方面，循环烟气主动与助燃风混合，燃料浓度和助燃风含氧浓度稀释，以抑制燃料在锅炉内的燃烧速度与集中放热，从而降低燃烧温度，降低NOx生成量。
循环烟气为独立通道，不影响助燃风通道，燃烧器阻力小，所需助燃风供给风机耗能小。
附图说明
图1为一种低氮氧化物排放的燃烧器的横截面示意图；
图中，
1.中心燃料通道、2.第一助燃风通道、3.第一循环烟气通道、4.第二助燃风通道、5.第二循环烟气通道、6.第三循环烟气通道、7.第一系列燃料喷枪、8.第二系列燃料喷枪。
具体实施方式
下面结合附图对本发明的实施例进一步说明。
实施例1
参考图1，一种低氮氧化物排放的燃烧器，包括中心燃料通道1，围绕中心燃料通道外圆周方向设置有第一助燃风通道2，第一助燃风通道2是以中心燃料通道为圆心的圆环，进口连接助燃风源，出口设置有混合风轮；围绕第一助燃风通道2外圆周方向设置有第一循环烟气通道3，第一循环烟气通道3的横截面为以中心燃料通道为圆心的圆环，在第一循环烟气通道3内沿圆环方向等距离设置有第一系列燃料喷枪7，第一循环烟气通道3的进口连接循环烟气。围绕第一循环烟气3通道外圆周方向设置有第二助燃风通道4，第二助燃风通道4的横截面为以中心燃料通道为圆心的圆环，第二助燃风通道4的进口连接助燃风源，出口设置有混合风轮。围绕第二助燃风通道4外圆周方向设置有第二循环烟气通道5，第二循环烟气通道5的横截面为以中心燃料通道为圆心的圆环，第二循环烟气通道5的进口连接循环烟气。围绕第二循环烟气通道5外圆周方向设置有第三循环烟气通道6，第三循环烟气通道6的横截面为以中心燃料通道为圆心的圆环；第三循环烟气通道内设置有第二系列燃料喷枪8。
中心燃料通道1、第一助燃风通道2、第一循环烟气通道3、第二助燃风通道4、第二循环烟气通道5、第三循环烟气通道6、第一系列燃料喷枪7、第二系列燃料喷枪8的出口在同一平面上。
中心燃料通道1为一根直径20cm的金属管，在中心燃料通道入口安装电动调节阀，其出口燃料能作为长明灯一直燃烧，确保炉膛火焰不熄灭。
第一系列燃料喷枪7由4～10根横截面大小相等的圆管组成，每根喷枪的直径为0.5～5.0cm，各喷枪进口连接燃料源。
第二系列燃料喷枪8由8～20根横截面大小相等的圆管组成，每根喷枪的直径为1.0～3.0cm，各喷枪进口连接燃料源。
下面通过实施例进一步说明低氮氧化物排放的燃烧器的使用方法。
实施例2
一种低氮氧化物排放的燃烧器，通入助燃风，点燃中心燃料通道1的出口和第一、第二系列燃料喷枪的出口，通过调节中心燃料通道的电动调节阀，其出口燃料能作为长明灯一直燃烧，确保炉膛火焰不熄灭。循环风机吸取炉膛中的烟气， 通过调节循环主烟管上的电动调节阀，调节循环烟气的流量，第一助燃风通道道被第一循环烟气通道包围，第二助燃风通道被第二循环烟气通道包围，使循环烟气与助燃风充分混合，降低助燃风的含氧量。第一系列燃料喷枪设置在第一循环烟道内，滴二系列燃料喷枪设置在第三循环烟道内，使循环烟气与燃料充分混合，降低燃料的燃烧速度，从而降低温度。
应用本技术，可节约能源消耗，降低NO x排放，在热风温度≤250℃的工况下，实现NO X<30mg/Nm 3。以25T锅炉计算，每小时烟气排放量约为22000Nm 3；现有燃烧器技术，在热风温度≤250℃的工况下，只能实现NO x排放<80mg Nm 3；采用超低氮燃烧器后，NO x排放<30mg Nm 3；NO x排放减少约为1.1Kg/h,每年单台25T锅炉NO x排放量减少近10吨。

Claims (10)

  1. 一种低氮氧化物排放的燃烧器，其特征在于，包括中心燃料通道，围绕中心燃料通道外圆周方向设置有第一助燃风通道，围绕第一助燃风通道外圆周方向设置有第一循环烟气通道，围绕第一循环烟气通道外圆周方向设置有第二助燃风通道，围绕第二助燃风通道外圆周方向设置有第二循环烟气通道，围绕第二循环烟气通道外圆周方向设置有第三循环烟气通道；
    所述第一循环烟气通道内设置有第一系列燃料喷枪，所述第三循环烟气通道内设置有第二系列燃料喷枪。
  2. 根据权利要求1所述的一种低氮氧化物排放的燃烧器，其特征在于，所述中心燃料通道、第一助燃风通道、第一循环烟气通道、第二助燃风通道、第二循环烟气通道、第三循环烟气通道、第一系列燃料喷枪、第二系列燃料喷枪的出口在同一平面上。
  3. 根据权利要求1所述的一种低氮氧化物排放的燃烧器，其特征在于，所述中心燃料通道为一根金属管，在中心燃料通道入口安装调节阀，其出口燃料能作为长明灯一直燃烧，确保炉膛火焰不熄灭。
  4. 根据权利要求1所述的一种低氮氧化物排放的燃烧器，其特征在于，所述第一助燃风通道的横截面为以中心燃料通道为圆心的圆环，第一助燃风通道的进口连接助燃风源，出口设置有混合风轮。
  5. 根据权利要求1所述的一种低氮氧化物排放的燃烧器，其特征在于，第一循环烟气通道的横截面为以中心燃料通道为圆心的圆环，在第一循环烟气通道内沿圆环方向等距离设置有第一系列燃料喷枪，第一循环烟气通道的进口连接循环烟气。
  6. 根据权利要求1所述的一种低氮氧化物排放的燃烧器，其特征在于，所述第二助燃风通道的横截面为以中心燃料通道为圆心的圆环，第二助燃风通道的进口连接助燃风源，出口设置有混合风轮。
  7. 根据权利要求1所述的一种低氮氧化物排放的燃烧器，其特征在于，所述第二循环烟气通道的横截面为以中心燃料通道为圆心的圆环，第二循环烟气通道的进口连接循环烟气。
  8. 根据权利要求1所述的一种低氮氧化物排放的燃烧器，其特征在于，所 述第三循环烟气通道的横截面为以中心燃料通道为圆心的圆环，在第三循环烟气通道内沿圆环方向等距离设置有第二系列燃料喷枪，第三循环烟气通道的进口连接循环烟气。
  9. 根据权利要求1所述的一种低氮氧化物排放的燃烧器，其特征在于，所述第一系列燃料喷枪由横截面大小相等的圆管组成，各喷枪进口连接燃料源。
  10. 根据权利要求1所述的一种低氮氧化物排放的燃烧器，其特征在于，所述第二系列燃料喷枪由横截面大小相等的圆管组成，各喷枪进口连接燃料源。
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