WO2011000136A1 - 一种低氮氧化物排放煤粉切向燃烧装置 - Google Patents

一种低氮氧化物排放煤粉切向燃烧装置 Download PDF

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Publication number
WO2011000136A1
WO2011000136A1 PCT/CN2009/001056 CN2009001056W WO2011000136A1 WO 2011000136 A1 WO2011000136 A1 WO 2011000136A1 CN 2009001056 W CN2009001056 W CN 2009001056W WO 2011000136 A1 WO2011000136 A1 WO 2011000136A1
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Prior art keywords
air nozzle
burnout
furnace
center
wall
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PCT/CN2009/001056
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English (en)
French (fr)
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上海锅炉厂有限公司
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Publication of WO2011000136A1 publication Critical patent/WO2011000136A1/zh
Priority to ZA2011/00735A priority Critical patent/ZA201100735B/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • 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
    • F23C5/32—Disposition of burners to obtain rotating flames, i.e. flames moving helically or spirally
    • 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 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/02—Disposition of air supply not passing through burner

Definitions

  • the invention relates to a tangential combustion device for pulverized coal with low nitrogen oxide emission, belonging to the technical field of combustion devices. Background technique
  • Nitrogen oxides are a class of gases that cause serious pollution in the atmospheric environment and are considered to be one of the main sources of atmospheric pollution. Nitrogen oxides emitted worldwide by burning fossil fuels each year account for a large proportion of all nitrogen oxide emissions. Increasingly stringent environmental regulations require research and development of advanced combustion technologies to reduce emissions of plutonium and other pollutants. At present, the biggest feature of China's energy composition is coal, which accounts for more than 70%. This will generate a large amount of nitrogen oxide gas. Therefore, such an energy structure will have a negative impact on economic growth and ecological environment.
  • the technical measures for controlling the enthalpy emissions of conventional coal-fired power station boilers can be divided into two types: low-lying combustion technology and flue gas purification technology.
  • Flue gas purification technology reduces the final emissions of plutonium by removing flue gas.
  • the emission reduction of foreign thermal power plants is mainly achieved through advanced operation modes, low-lying combustion technology and tail flue gas denitration technology.
  • the tail flue gas denitration technology is relatively thorough, but its investment and operation and maintenance costs are expensive.
  • Advanced low-pressure combustion technology can reduce the emission concentration to 450 ⁇ 650mg/Nm : 'below, and as the amount of NOx generated in the furnace decreases, the operating cost of the tail denitration unit will also be reduced.
  • staged combustion technology including air classification and fuel classification.
  • Fuel classification technology is also known as fuel reburning (reduction N0) technology.
  • reduction N0 fuel reburning
  • the most widely used and most mature mainstream low NOx combustion technology at home and abroad is the air classification technology, which has been widely adopted in power station boilers in China.
  • the reduction zone In the middle of the first and second combustion zones is a reduction zone with a reducing atmosphere with an oxygen concentration close to zero.
  • the reduction medium in this zone has a significant effect on reducing the NOx formed.
  • the overall air classification technology in the furnace can reduce the NOx production by 30% ⁇ 50%. The greater the degree of air classification, the greater the share of the burned-out wind and the greater the degree of NOx emission reduction.
  • the object of the present invention is to optimize the design of the burnout wind, providing a pulverized coal tangentially burning device having low nitrogen oxide emissions, low fly ash carbon content and low furnace flue gas temperature deviation.
  • the technical proposal of the present invention is to provide a tangential combustion device for pulverized coal with low nitrogen oxide emission, including a furnace, and a primary air nozzle and a secondary air nozzle disposed at opposite corners of the main combustion zone of the furnace.
  • the axis of the primary air nozzle or the secondary air nozzle located on the same horizontal plane is cut into a circle centered on the center of the furnace, and is characterized in that: at least one burnout is provided on the four walls of the furnace above the primary air nozzle and the secondary air nozzle.
  • each of the exhaust gas nozzle groups includes four burnout air nozzles, one on each wall of the furnace, and located at the same horizontal plane; the axes of the four groups of the same exhaust wind nozzles are cut into the furnace
  • the center is an imaginary circle of the center of the circle.
  • a burnout air nozzle group is disposed on the four walls of the furnace above the primary air nozzle and the secondary air nozzle, and the burnout air nozzle is disposed on the center line of each wall.
  • Two burnout air nozzle groups are provided on the four walls of the furnace above the primary air nozzle and the secondary air nozzle, and the exhaust air nozzles in each group are arranged on the center line of each wall.
  • a burnout air nozzle group is arranged on the four walls of the furnace above the primary air nozzle and the secondary air nozzle, and the burnout air nozzle is arranged on a vertical line deviating from the center line of each wall, and the axis of the burnout wind nozzle is cut off from An imaginary tangent circle having a diameter d equal to or less than 2/3 of the furnace width centered on the center of the hearth.
  • burnout air nozzles on the four walls of the furnace above the primary air nozzle and the secondary air nozzle, one of which is arranged on the center line of each wall, and the other is arranged by the exhaust gas nozzle group.
  • the axis of the burnout air nozzle is cut to an imaginary tangent circle having a diameter d centered on the center of the furnace center and less than or equal to 2/3 of the furnace width.
  • Two burnout air nozzle groups are arranged on the side wall of the furnace above the primary air nozzle and the secondary air nozzle, and each of the burnout air nozzle groups is arranged on a vertical line deviating from the center line of each wall, wherein the burnout is completed
  • the axis of the wind nozzle is cut to an imaginary tangent circle having a diameter d centered on the center of the furnace and having a width d of 2/3 or less.
  • burnout air nozzle groups on the four walls of the furnace above the primary air nozzle and the secondary air nozzle, wherein two burnout air nozzle groups are arranged on the center line of each wall, and another burnout air nozzle group is arranged.
  • the axis of the burnout air nozzle is cut to an imaginary tangent circle having a diameter d centered on the center of the furnace center and less than or equal to 2/3 of the furnace width.
  • the distance between the center of the burnout air nozzle on each wall of the furnace and the center of the uppermost primary air nozzle and the uppermost row 5 ⁇ 1 ⁇
  • the ratio of the distance from the center of the wind nozzle to the bottom of the screen is 0. 1 ⁇ 0. 5: 1.
  • the ratio of the air quality passed by the burnout air nozzle (6) to the total air mass of the boiler is 10% - 30%.
  • the present invention arranges separate burnout winds at a certain distance above the main burner arranged at the square corner, and the burnout air nozzles are not disposed on the four corners but on the four walls of the furnace.
  • the present invention can enhance the turbulent mixing of the burned-out wind and the high-temperature flue gas while controlling the NOx emission, and enhance the burnout of the coke and the burn-up of the CO.
  • the swirling intensity of the burning fireball can be adjusted, which is beneficial to control the flue gas velocity and temperature deviation at the exit of the furnace.
  • the invention can realize low NOx emission and reduce NOx production amount based on the overall air classification technology in the currently used bituminous coal and lean coal furnace to control the NOx effect of 250 ⁇ 650mg/m :i (the concentration of flue gas oxygen is 6%). About 10%. It solves the problems of high fly ash combustibles, large flue gas velocity and temperature deviation at the furnace exit, and increases the operational regulation performance for different coal types and load changes.
  • Figure 1 is a schematic view of a tangential combustion device for pulverized coal with low nitrogen oxide emissions
  • Figure 2 is a cross-sectional view taken along line A-A of Figure 1;
  • Figure 3 is a cross-sectional view taken along line B-B of Figure 1;
  • Figure 4 is a schematic view of another tangential combustion device for discharging pulverized coal with low nitrogen oxides
  • Figure 5 is a cross-sectional view taken along line A-A of Figure 4.
  • Figure 6 is a cross-sectional view taken along line B-B of Figure 4.
  • Fig. 1 it is a schematic diagram of a tangential combustion device for pulverized coal with low nitrogen oxide emission. It is suitable for the four-corner tangential coal-fired boiler in thermal power plant. According to the height of the furnace, the furnace is divided into main combustion according to the characteristics of the pulverized coal combustion area. Zone 1, Reduction Zone 2 and Burnout Zone 3.
  • the main burner group is composed of a plurality of primary air nozzles 4 and a secondary air nozzle 5, which are arranged on the four corners of the furnace.
  • the nozzle structure and arrangement are the same as those of the conventional four-corner tangential combustion system, as shown in FIG.
  • the axis of the primary air nozzle 4/secondary air nozzle 5 is cut to an imaginary tangential circle centered on the center of the furnace, and the actual flow will form a swirling airflow in the furnace.
  • the ratio of the air quality passed by the burnout air nozzle 6 to the total air mass of the boiler is 20%, as shown in FIG. 2,
  • a cross-sectional view of a pulverized coal burning device with a low nitrogen oxide emission the device comprising two groups of burnout air nozzles, each of which is provided with two burnout air nozzles 6 arranged on the center line of each wall
  • the axis is cut to an imaginary cut circle with a diameter of zero centered on the center of the hearth.
  • the NOx reduction zone 2 is formed in the furnace height range between the main burner and the burnout air nozzle 6, and the burnout zone 3 is above the burnout wind.
  • the wall-mounted exhaust gas nozzle has the function of manually adjusting the horizontal swing angle.
  • the combustion adjustment adjusts the degree of the horizontal swing angle according to the operating conditions, the carbon content of the fly ash and the flue gas velocity and temperature deviation of the furnace outlet are controlled. .
  • FIG. 4 it is another schematic diagram of the tangential combustion device for pulverized coal with low nitrogen oxide emission. It is suitable for the four-corner tangential coal-fired boiler in thermal power plant. According to the height of the furnace, the furnace is divided according to the characteristics of the pulverized coal combustion area. Burning zone 1, reduction zone 2 and burnout zone 3.
  • the main burner group is composed of a plurality of primary air nozzles 4 and a secondary air nozzle 5, which are arranged on the four corners of the furnace.
  • the nozzle structure and arrangement are the same as those of the conventional four-corner tangential combustion system, as shown in FIG.
  • the axis of the primary air nozzle 4/secondary air nozzle 5 is cut to a circle centered on the center of the furnace, and the actual flow will form a swirling airflow in the furnace.
  • the ratio of the air mass passing through the burnout air nozzle 6 to the total air mass of the boiler is 20%, as shown in FIG. 5, which is the AA cross-sectional view in FIG. 1, and the device includes three burnout air nozzle groups.
  • Each wall is provided with three burnout air nozzles 6, two of which are arranged on the central vertical line of each wall, the axis of which is cut to an imaginary cut circle having a diameter of zero centered on the center of the hearth.
  • the other nozzle is arranged on a vertical line deviating from the center line of each wall, and the axis of the corresponding nozzle on the axis of the other three walls is cut in the furnace by an imaginary circle with a diameter d of 5000 hidden.
  • a NOx reduction zone 2 is formed in the furnace height range between the main burner and the burnout air nozzle, and a burnout zone 3 is above the burnout wind.
  • the wall-mounted exhaust gas nozzle has the function of manually adjusting the horizontal swing angle.
  • the combustion adjustment adjusts the degree of the horizontal swing angle according to the operating conditions, the carbon content of the fly ash and the flue gas velocity and temperature deviation of the furnace outlet are controlled. .
  • Embodiment 2 The same as Embodiment 2, except that a burn-out air nozzle group is disposed on the four walls of the furnace above the primary air nozzle 4 and the secondary air nozzle 5, and the burn-out air nozzle 6 is disposed on the center line of each wall. Burnout nozzles on each wall of the furnace 6 The distance between the center of the uppermost primary air nozzle 4 and the center of the uppermost row of the air nozzles 4 is 0. 1 : 1. The ratio of the air quality passed by the burnout air nozzle 6 to the total air mass of the boiler is 10%.
  • Embodiment 2 The same as Embodiment 2, except that a burn-out air nozzle group is disposed on the four walls of the furnace above the primary air nozzle 4 and the secondary air nozzle 5, and the burnout air nozzle 6 is arranged vertically from the center line of each wall.
  • the axis of the burnout air nozzle 6 is cut to an imaginary tangent circle having a diameter d centered on the center of the hearth equal to 2/3 of the furnace width.
  • the distance between the center of the burnout air nozzle 6 on each wall of the furnace and the center of the uppermost primary air nozzle 4 is 9000, and the ratio of the distance from the center of the uppermost primary air nozzle 4 to the bottom of the screen 7 is 18000 mm. 5 : 1.
  • the ratio of the air quality passed by the burnout air nozzle 6 to the total air mass of the boiler is 30%.
  • the difference is that two burnout air nozzle groups are arranged on the four walls of the furnace above the primary air nozzle 4 and the secondary air nozzle 5, and one of the burnout air nozzle groups is arranged at the center line of each wall. Above, another group of burnout air nozzles is arranged on a vertical line deviating from the center line of each wall, wherein the axis of the burnout air nozzle 6 is cut at a diameter d equal to the center of the hearth of the furnace center equal to 2/3 of the furnace width Imagine cutting the circle.
  • the difference is that two burning air nozzle groups are arranged on the side wall of the furnace above the primary air nozzle 4 and the secondary air nozzle 5, and each of the burning air nozzle groups is arranged away from the center line of each wall.
  • the axis of the burnout air nozzle 6 is cut to an imaginary tangent circle having a diameter d centered on the center of the hearth and having a width d of 2/3 or less.

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

Description

一种低氮氧化物排放煤粉切向燃烧装置 技术领域
本发明涉及一种低氮氧化物排放煤粉切向燃烧装置， 属于燃烧装置技术领域。 背景技术
氮氧化物（N0x， 包括 Ν0、 Νθ2、 Ν20 ) 是一类能造成大气环境严重污染的气体， 被认为 是大气污染的主要来源之一。 每年在世界范围因燃烧化石燃料而排放的氮氧化物在所有氮 氧化物排放中占有很大的比例。 日益严格的环保法规要求研究幵发先进的燃烧技术， 以减 少 ΝΟχ等污染物的排放。 目前我国的能源构成的最大特点是以煤炭为主， 占 70 %以上， 这 将产生大量的氮氧化物气体， 因此这样的能源结构对经济高效增长及生态环境都会产生负 面影响。 目前己有的控制常规燃煤电站锅炉 ΝΟχ排放的技术措施可分为低 ΝΟχ燃烧技术和 烟气净化技术两类。 烟气净化技术是通过脱除烟气中 ΝΟχ来降低 ΝΟχ的最终排放量。 国外 火电厂 ΝΟχ减排主要通过先进的运行操作方式、 低 ΝΟχ燃烧技术与尾部烟气脱硝技术来实 现。 尾部烟气脱硝技术比较彻底， 但其投资与运行维护费用昂贵。 先进低 ΝΟχ燃烧技术可 降低排放浓度到 450〜650mg/Nm:'以下， 而且随着炉内 NOx生成量的减少， 也会降低尾部脱 硝装置的运行成本。 低 NOx燃烧技术的核心之一是分级燃烧技术， 包括空气分级和燃料分 级两种， 燃料分级技术又称为燃料再燃 （还原 N0 ) 技术。 国内外煤粉锅炉采用最广泛、 技 术最为成熟的主流低 NOx燃烧技术是空气分级技术，它在我国的电站锅炉已得到普遍采用。
经对现有技术的文献检索发现， 《低氮氧化物燃烧技术的发展状况》 （毕玉森， 热力发 电， 2000年 02期）详细介绍了 ABB-CE公司开发的四角切圆炉膛整体空气分级直流燃烧器、 同轴燃烧系统 (CFS I 、 CFS II )以及两者组合形式一低 NOx同轴燃烧系统。 炉膛整体空气分 级是将燃烧所需的空气量分成两级送入， 第一级燃烧区中为燃烧器提供的空气占煤粉完全 燃烧所需要量的 60 %至 90 %， 燃料先在缺氧的富燃料条件下燃烧。 在二级燃烧区内， 将 燃烧用的空气的剩余部分以二次空气 （燃尽风） 输入， 成为富氧燃烧区。 在一、 二级燃烧 区的中间是氧浓度接近零的具有还原性气氛的还原区， 这一区域的还原介质对于还原己经 生成的 NOx作用很明显。炉内整体空气分级技术可使 NOx生成量降低 30 %〜50 %， 空气分 级的程度越大， 即燃尽风所占的份额越大， NOx减排的程度越大。
燃尽风的比例对燃烧效率的影响还是很大的， 通常燃尽风比例越高， 燃烧效率越低， 燃尽风的投运对炉膛出口烟温偏差的影响也是很大的， 如何优化燃尽风的设计是亟待解决 的问题。
发明内容
本发明的目的是优化燃尽风的设计， 提供具有低氮氧化物排放量、 低飞灰含碳量和低 炉膛出口烟温偏差的一种煤粉切向燃烧装置。
为了达到上述目的， 本发明的技术方案是提供一种低氮氧化物排放煤粉切向燃烧装 置， 包括炉膛， 炉膛的主燃区四角上设有相间设置的一次风喷嘴和二次风喷嘴， 位于同一 水平面上的一次风喷嘴或二次风喷嘴的轴线切于以炉膛中心为圆心的圆， 其特征在于： 在 一次风喷嘴和二次风喷嘴上方炉膛的四面墙上设有至少一个燃尽风喷嘴组； 每个燃尽风喷 嘴组包括四个燃尽风喷嘴， 在炉膛的每面墙上各布置一个， 且位于同一水平面； 同组的四 个燃尽风喷嘴的轴线切于以炉膛中心为圆心的一个假想切圆。
进一歩地， 在一次风喷嘴和二次风喷嘴上方炉膛的四面墙上设有一个燃尽风喷嘴组， 燃尽风喷嘴布置在每面墙的中心线上。
在一次风喷嘴和二次风喷嘴上方炉膛的四面墙上设有两个燃尽风喷嘴组， 每组中的燃 尽风喷嘴布置在每面墙的中心线上。
在一次风喷嘴和二次风喷嘴上方炉膛的四面墙上设有一个燃尽风喷嘴组， 燃尽风喷嘴 布置在偏离每面墙中心线的竖直线上， 燃尽风喷嘴的轴线切于以炉膛中心为圆心的直径 d 小于等于 2/3炉膛宽度的一个假想切圆。
在一次风喷嘴和二次风喷嘴上方炉膛的四面墙上设有两个燃尽风喷嘴组， 其中一个燃 尽风喷嘴组布置在每面墙的中心线上， 另一个燃尽风喷嘴组布置在偏离每面墙中心线的竖 直线上、 其中的燃尽风喷嘴的轴线切于以炉膛中心为圆心的直径 d小于等于 2/3炉膛宽度 的一个假想切圆。
在一次风喷嘴和二次风喷嘴上方炉膛的侧墙上设有两个燃尽风喷嘴组， 每个燃尽风喷 嘴组布置在偏离每面墙中心线的竖直线上、 其中的燃尽风喷嘴的轴线切于以炉膛中心为圆 心的直径 d小于等于 2/3炉膛宽度的一个假想切圆。
在一次风喷嘴和二次风喷嘴上方炉膛的四面墙上设有三个燃尽风喷嘴组， 其中两个燃 尽风喷嘴组布置在每面墙的中心线上， 另一个燃尽风喷嘴组布置在偏离每面墙中心线的竖 直线上、 其中的燃尽风喷嘴的轴线切于以炉膛中心为圆心的直径 d小于等于 2/3炉膛宽度 的一个假想切圆。
炉膛每面墙上的燃尽风喷嘴的中心与最上排一次风喷嘴的中心的距离 h和最上排一次 风喷嘴的中心到屏底的距离 H的比例为 0. 1〜0. 5： 1。
所述燃尽风喷嘴 （6 ) 通过的空气质量占锅炉燃烧总空气质量的比例为 10%- 30%。 本发明在四角切圆布置的主燃烧器上方一定距离处布置分离的燃尽风， 燃尽风喷嘴不 是布置四角上， 而是布置在炉膛的四面墙上。 与现有技术相比， 本发明可在控制 NOx排放 的同时， 能够加强燃尽风与高温烟气的湍流混合， 强化焦碳的燃尽和 CO 的燃尽。 通过燃 尽风的反切， 能够对燃烧火球的旋流强度进行调节， 有利于控制炉膛出口的烟气速度和温 度偏差。
本发明能够在目前燃用烟煤和贫煤炉内整体空气分级技术控制 NOx 效果 250〜 650mg/m:i (烟气氧浓度 6%时）基础上， 实现 NOx低排放， 使 NOx生成量再降低 10 %左右。 解 决炉内整体空气分级技术带来的飞灰可燃物高， 炉膛出口的烟气速度和温度偏差大等问 题， 同时增加了针对不同煤种和负荷变化的运行调节性能。
附图说明
图 1为一种低氮氧化物排放煤粉切向燃烧装置示意图；
图 2为图 1中 A-A截面图；
图 3为图 1中 B- B截面图；
图 4为另一种低氮氧化物排放煤粉切向燃烧装置示意图；
图 5为图 4中 A-A截面图；
图 6为图 4中 B-B截面图。
具体实施方式
下面结合附图和实施例对本发明作进一步说明。
实施例 1
如图 1所示， 为一种低氮氧化物排放煤粉切向燃烧装置示意图， 适应于火电厂四角切 圆燃煤锅炉， 沿炉膛高度方向， 根据煤粉燃烧区域特点炉膛被划分为主燃区 1、 还原区 2 和燃尽区 3。 在主燃区由多层一次风喷嘴 4、 二次风喷嘴 5相间组成主燃烧器组， 布置在 炉膛四角上， 喷嘴结构和布置形式与通常四角切圆燃烧系统相同， 如图 3所示， 为图 1中 B-B截面图， 一次风喷嘴 4/二次风喷嘴 5的轴线切于以炉膛中心为圆心的一个假想切圆， 实际流动将在炉内形成旋转气流。
所述燃尽风喷嘴 6通过的空气质量占锅炉燃烧总空气质量的比例为 20%，如图 2所示， 为一种低氮氧化物排放煤粉切向燃烧装置截面图， 所述装置包括两个燃尽风喷嘴组， 每面 墙布置 2个燃尽风喷嘴 6， 布置在每面墙的中心线上， 其轴线切于以炉膛中心为圆心的直 径为零的一个假想切圆。 这样在主燃烧器和燃尽风喷嘴 6之间的炉膛高度范围内形成 NOx 还原区 2 , 在燃尽风上方为燃尽区 3。 墙式布置的燃尽风喷嘴组的中心距离最上排一次风喷嘴中心的距离 h=8100讓， 与最 上排一次风喷嘴中心到屏底的距离 H= 18000國的比例： h/H=0. 45。
墙式布置的燃尽风喷嘴具有手动调节水平方向摆角的功能，燃烧调整时根据运行工况 调节水平方向摆角的度数， 来控制飞灰含碳量和炉膛出口的烟气速度和温度偏差。
实施例 2
如图 4所示， 为另一种低氮氧化物排放煤粉切向燃烧装置示意图， 适应于火电厂四角 切圆燃煤锅炉， 沿炉膛高度方向， 根据煤粉燃烧区域特点炉膛被划分为主燃区 1、 还原区 2和燃尽区 3。 在主燃区 1由多层一次风喷嘴 4、 二次风喷嘴 5相间组成主燃烧器组， 布置 在炉膛四角上， 喷嘴结构和布置形式与通常四角切圆燃烧系统相同， 如图 6所示， 为图 4 中 B-B截面图， 一次风喷嘴 4/二次风喷嘴 5的轴线切于以炉膛中心为圆心的圆， 实际流动 将在炉内形成旋转气流。
所述燃尽风喷嘴 6通过的空气质量占锅炉燃烧总空气质量的比例为 20%,如图 5所示， 为图 1中 A-A截面图， 所述的装置包括三个燃尽风喷嘴组， 每面墙布置 3个燃尽风喷嘴 6， 其中 2个布置在每面墙的中心竖直线上， 其轴线切于以炉膛中心为圆心的直径为零的一个 假想切圆。 另外 1个喷嘴布置在偏离每面墙的中心线的竖直线上， 其轴线与其他 3面墙上 的对应喷嘴的轴线在炉内切于一直径 d为 5000隱的一个假想切圆， 圆的旋转方向与燃烧 火球的旋转方向相反， 所以在运行时调节该喷嘴的风量大小也能起到消旋作用， 进一步起 到控制炉膛出口的烟气速度和温度偏差的作用。 这样在主燃烧器和燃尽风喷嘴之间的炉膛 高度范围内形成 NOx还原区 2， 在燃尽风上方为燃尽区 3。 墙式布置的燃尽风喷嘴组的中心距离最上排一次风喷嘴中心的距离 h=8100國， 与最 上排一次风喷嘴中心到屏底的距离 H=18000mm的比例： h/H=0. 45。
墙式布置的燃尽风喷嘴具有手动调节水平方向摆角的功能，燃烧调整时根据运行工况 调节水平方向摆角的度数， 来控制飞灰含碳量和炉膛出口的烟气速度和温度偏差。
实施例 3
同实施例 2， 区别在于， 在一次风喷嘴 4和二次风喷嘴 5上方炉膛的四面墙上设有一 个燃尽风喷嘴组， 燃尽风喷嘴 6布置在每面墙的中心线上。 炉膛每面墙上的燃尽风喷嘴 6 的中心与最上排一次风喷嘴 4的中心的距离 h=1800隱和最上排一次风喷嘴 4的中心到屏 底 7的距离 H-18000隱 的比例为 0. 1 : 1。 所述燃尽风喷嘴 6通过的空气质量占锅炉燃烧 总空气质量的比例为 10%。
实施例 4
同实施例 2， 区别在于， 在一次风喷嘴 4和二次风喷嘴 5上方炉膛的四面墙上设有一 个燃尽风喷嘴组，燃尽风喷嘴 6布置在偏离每面墙中心线的竖直线上，燃尽风喷嘴 6的轴 线切于以炉膛中心为圆心的直径 d等于 2/3炉膛宽度的一个假想切圆。炉膛每面墙上的燃 尽风喷嘴 6的中心与最上排一次风喷嘴 4的中心的距离 h=9000薩和最上排一次风喷嘴 4 的中心到屏底 7的距离 H=18000mm的比例为 0. 5 : 1。 所述燃尽风喷嘴 6通过的空气质量 占锅炉燃烧总空气质量的比例为 30%。
实施例 5
同实施例 2， 区别在于， 在一次风喷嘴 4和二次风喷嘴 5上方炉膛的四面墙上设有两 个燃尽风喷嘴组，其中一个燃尽风喷嘴组布置在每面墙的中心线上， 另一个燃尽风喷嘴组 布置在偏离每面墙中心线的竖直线上、其中的燃尽风喷嘴 6的轴线切于以炉膛中心为圆心 的直径 d等于 2/3炉膛宽度的一个假想切圆。炉膛每面墙上的燃尽风喷嘴 6的中心与最上 排一次风喷嘴 4的中心的距离 h=9000mm和最上排一次风喷嘴 4的中心到屏底 7的距离 H= 18000國 的比例为 0. 5 : 1。
实施例 6
同实施例 2， 区别在于， 在一次风喷嘴 4和二次风喷嘴 5上方炉膛的侧墙上设有两个 燃尽风喷嘴组，每个燃尽风喷嘴组布置在偏离每面墙中心线的竖直线上，其中的燃尽风喷 嘴 6的轴线切于以炉膛中心为圆心的直径 d小于等于 2/3炉膛宽度的一个假想切圆。炉膛 每面墙上的燃尽风喷嘴 6的中心与最上排一次风喷嘴 4的中心的距离 h=9000隱和最上排 一次风喷嘴 4的中心到屏底 7的距离 H= 18000mm的比例为 0. 5： 1。

Claims

权利要求：
1、 一种低氮氧化物排放煤粉切向燃烧装置， 包括炉膛， 炉膛的主燃区（1)四角上设有相 间设置的一次风喷嘴 （4) 和二次风喷嘴 （5)， 位于同一水平面上的一次风喷嘴 （4) 或二次风喷嘴（5)的轴线切于以炉膛中心为圆心的一个假想切圆， 其特征在于： 在一 次风喷嘴 （4) 和二次风喷嘴 （5) 上方炉膛的四面墙上设有至少一个燃尽风喷嘴组； 每个燃尽风喷嘴组包括四个燃尽风喷嘴 （6)， 在炉膛的每面墙上各布置一个， 且位于 同一水平面； 同组的燃尽风喷嘴 （6) 的轴线切于以炉膛中心为圆心的一个假想切圆。
2、 如权利要求 1所述的低氮氧化物排放煤粉切向燃烧装置， 其特征在于， 在一次风喷嘴
(4)和二次风喷嘴（5)上方炉膛的四面墙上设有一个燃尽风喷嘴组， 燃尽风喷嘴（6) 布置在每面墙的中心线上。
3、 如权利要求 1所述的低氮氧化物排放煤粉切向燃烧装置， 其特征在于， 在一次风喷嘴
(4) 和二次风喷嘴 （5) 上方炉膛的四面墙上设有两个燃尽风喷嘴组， 每组中的燃尽 风喷嘴 （6) 布置在每面墙的中心线上。
4、 如权利要求 1所述的低氮氧化物排放煤粉切向燃烧装置， 其特征在于， 在一次风喷嘴
(4)和二次风喷嘴（5)上方炉膛的四面墙上设有一个燃尽风喷嘴组， 燃尽风喷嘴（6) 布置在偏离每面墙中心线的竖直线上， 燃尽风喷嘴（6)的轴线切于以炉膛中心为圆心 的直径 d小于等于 2/3炉膛宽度的一个假想切圆。
5、 如权利要求 1所述的低氮氧化物排放煤粉切向燃烧装置， 其特征在于， 在一次风喷嘴
(4) 和二次风喷嘴 （5) 上方炉膛的四面墙上设有两个燃尽风喷嘴组， 其中一个燃尽 风喷嘴组布置在每面墙的中心线上， 另一个燃尽风喷嘴组布置在偏离每面墙中心线的 竖直线上、 其中的燃尽风喷嘴 （6) 的轴线切于以炉膛中心为圆心的直径 d 小于等于 2/3炉膛宽度的一个假想切圆。
6、 如权利要求 1所述的低氮氧化物排放煤粉切向燃烧装置， 其特征在于， 在一次风喷嘴
(4) 和二次风喷嘴 （5) 上方炉膛的侧墙上设有两个燃尽风喷嘴组， 每个燃尽风喷嘴 组布置在偏离每面墙中心线的竖直线上、其中的燃尽风喷嘴（6)的轴线切于以炉膛中 心为圆心的直径 d小于等于 2/3炉膛宽度的一个假想切圆。
7、 如权利要求 1所述的低氮氧化物排放煤粉切向燃烧装置， 其特征在于， 在一次风喷嘴
(4) 和二次风喷嘴 （5) 上方炉膛的四面墙上设有三个燃尽风喷嘴组， 其中两个燃尽 风喷嘴组布置在每面墙的中心线上， 另一个燃尽风喷嘴组布置在偏离每面墙中心线的 竖直线上、 其中的燃尽风喷嘴 （6) 的轴线切于以炉膛中心为圆心的直径 d 小于等于 2/3炉膛宽度的一个假想切圆。
、 如权利要求 1所述的一种低氮氧化物排放煤粉切向燃烧装置， 其特征在于， 炉膛每面 墙上的燃尽风喷嘴 （6) 的中心与最上排一次风喷嘴 （4) 的中心的距离 h和最上排一 次风喷嘴 （4) 的中心到屏底 （7) 的距离 H的比例为 0.1-0.5: 1。
、 如权利要求 1所述的一种低氮氧化物排放煤粉切向燃烧装置， 其特征在于， 所述燃尽 风喷嘴 （6) 通过的空气质量占锅炉燃烧总空气质量的比例为 10%-30%。
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