CN205227306U - Deep or light hierarchical buggy low NOx burner - Google Patents
Deep or light hierarchical buggy low NOx burner Download PDFInfo
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- 239000003245 coal Substances 0.000 claims abstract description 71
- 239000003381 stabilizer Substances 0.000 claims abstract description 26
- 238000005192 partition Methods 0.000 claims abstract description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000002485 combustion reaction Methods 0.000 abstract description 40
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 47
- 238000000926 separation method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical group [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000000197 pyrolysis Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 240000004282 Grewia occidentalis Species 0.000 description 1
- 108091060210 Heavy strand Proteins 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Abstract
本实用新型涉及煤粉锅炉燃烧器技术领域,更具体而言,涉及一种浓淡分级的煤粉低氮燃烧器,主要适用于电站锅炉、工业锅炉等煤粉燃烧设备的燃烧器;提供一种减少整个系统设备的磨损和压降并优化燃烧的浓淡分级煤粉低氮燃烧器;包括燃烧器壳体,所述燃烧器壳体内设置有丘型浓淡挡块、喷头浓淡相隔板、丘型特浓相挡块、燃烧器喷口和水滴型引火稳焰器,所述丘型浓淡挡块有三个,呈阶梯状布设,所述丘型浓淡挡块后端设置有喷口浓淡相隔板,所述喷口浓淡相隔板上方设置有丘型特浓相挡块,所述丘型特浓相挡块后端设置有水滴型引火稳焰器,所述水滴型引火稳焰器的末端与燃烧器喷口边缘平齐;本实用新型主要应用在锅炉方面。
The utility model relates to the technical field of pulverized coal boiler burners, more specifically, relates to a pulverized coal low-nitrogen burner with graded concentration, which is mainly suitable for burners of pulverized coal combustion equipment such as power station boilers and industrial boilers; it provides a Reduce the wear and pressure drop of the entire system equipment and optimize the combustion of the rich-lean graded pulverized coal low-nitrogen burner; including the burner shell, the burner shell is equipped with a hill-shaped thick-lean stopper, a nozzle thick-lean phase partition, a hill-shaped special Dense phase block, burner spout and water drop type ignition flame stabilizer. There are three mound-type thick-thin blockers arranged in a ladder shape. A mound-shaped extra-dense phase block is arranged above the thick-lean phase partition, and a water drop-type ignition flame stabilizer is arranged at the rear end of the mound-shaped extra-dense phase block. The end of the water drop-type ignition flame stabilizer is flush with the burner nozzle edge. Qi; the utility model is mainly used in boilers.
Description
技术领域 technical field
本实用新型涉及煤粉锅炉燃烧器技术领域,更具体而言,涉及一种浓淡分级的煤粉低氮燃烧器,主要适用于电站锅炉、工业锅炉等煤粉燃烧设备的燃烧器。 The utility model relates to the technical field of pulverized coal boiler burners, and more specifically relates to a pulverized coal low-nitrogen burner with graded concentration, which is mainly suitable for burners of pulverized coal combustion equipment such as power station boilers and industrial boilers.
背景技术 Background technique
氮氧化物(NOx)是燃煤锅炉排放的主要大气污染物之一。燃煤电站锅炉即工业锅炉排放大量的氮氧化物,严重破坏生态环境,威胁人类健康。目前,控制NOx排放的控制措施有两大类,一类是在燃煤燃烧过程中的低NOx燃烧技术,另一类是在燃烧后的烟气脱氮技术,控制其生成或将其还原。低NOx燃烧技术主要根据燃烧过程中的NOx生成机理,通过组织炉内燃烧过程来减少NOx的生成量,从而降低锅炉NOx的排放量。常用的炉内低NOx燃烧技术主要有低氧燃烧、低NOx燃烧器、烟气再循环,以及燃料或空气分级燃烧技术。 Nitrogen oxides (NOx) are one of the main air pollutants emitted by coal-fired boilers. Coal-fired power plant boilers, that is, industrial boilers, emit a large amount of nitrogen oxides, which seriously damages the ecological environment and threatens human health. At present, there are two types of control measures to control NOx emissions, one is low-NOx combustion technology during coal combustion, and the other is flue gas denitrification technology after combustion to control its formation or reduce it. The low NOx combustion technology is mainly based on the NOx generation mechanism in the combustion process, and reduces the NOx generation by organizing the combustion process in the furnace, thereby reducing the NOx emission of the boiler. Commonly used furnace low NOx combustion technologies mainly include low oxygen combustion, low NOx burners, flue gas recirculation, and fuel or air staged combustion technologies.
低NOx燃烧器是煤粉锅炉中最常用的NOx控制技术,其不但可以组织良好的燃烧,而且对NOx的生成有明显的减排作用。为了降低燃烧过程中氮氧化物的排放量,目前已经有了许多结构形式的低NOx燃烧器的设计。浓淡偏差燃烧是近年来国内外广泛采用的一种降低锅炉燃烧排放NOx的燃烧技术,此法依靠一定的燃烧器内部结构,使煤粉流中的煤粉和空气最大限度分流,改变燃烧器的风、煤比例,从而使煤粉发生偏差燃烧,不需要空气分级燃烧产生的大范围炉膛还原性气氛,属于微观上的分级燃烧,以降低NOx的生成。现有浓淡煤粉燃烧器,多利用管道弯头对煤粉进行浓缩,用平板或螺旋叶片造成浓淡比,使进料在炉内形成浓淡程度不同的两股煤粉射流,如“一种等速浓淡型的低NOx煤粉燃烧器”(专利号:CN101055076),该类型弯头煤粉燃烧器,均借助煤粉入射速度惯性,将煤粉甩向输送管一侧的侧壁,为了保证分流后煤粉浓相具有足够的速度,弯头处煤粉对管壁的撞击力极大,对管壁材料要求高,折损燃烧器寿命;直流燃烧器可从根本上避免弯头处的损耗,目前已有各种直流浓淡燃烧器,利用分流挡块和浓股喷口处的挡板对颗粒流进行浓淡分离,如“多重富集型直流煤粉燃烧器”(专利号CN1439841),此类燃烧器出口气流是直流射流,出口在水平方向上分为浓股火嘴和淡股火嘴,它的特征是扩散角小、射程远,但由于单侧设置挡块或挡板,对煤粉浓缩效果偏低或不显著,特别是对于低挥发份的煤,该气流煤粉燃烧时的空气量依然高于或接近煤中挥发分燃烧所需的空气量,容易在燃烧初期产生NOx;另外,与旋流式燃烧器相比,周围卷吸作用小而且没有中心回流,对着火不利,稳燃效果差。为了加强稳燃和燃烧效率,普通直流燃烧器多配合采用带有稳焰器的喷头,专利“一种浓侧分级的煤粉解耦燃烧器”(专利号:CN202452487U),该设计不仅可以提高解耦燃烧的效果,结构简单,而且可以和不同煤粉浓缩装置对接,但是其整个系统设备的磨损和压降还有待改进。 Low NOx burner is the most commonly used NOx control technology in pulverized coal boilers. It can not only organize good combustion, but also have obvious emission reduction effect on the formation of NOx. In order to reduce the emission of nitrogen oxides in the combustion process, there have been many designs of low NOx burners in structural forms. Concentration deviation combustion is a combustion technology widely used at home and abroad in recent years to reduce NOx emissions from boiler combustion. This method relies on a certain internal structure of the burner to maximize the separation of pulverized coal and air in the pulverized coal flow, changing the burner’s Air and coal ratio, so that the pulverized coal will be burned in deviation, and the large-scale furnace reducing atmosphere produced by the air staged combustion is not required. It belongs to the microscopic staged combustion to reduce the formation of NOx. Existing thick and thin pulverized coal burners usually use pipeline elbows to concentrate pulverized coal, and use flat plates or spiral blades to form a concentration ratio, so that the feed can form two jets of pulverized coal with different concentrations in the furnace, such as "one kind High-speed thick-lean low NOx pulverized coal burner" (Patent No.: CN101055076), this type of elbow pulverized coal burner uses the inertia of the incident velocity of pulverized coal to throw the pulverized coal to the side wall of the delivery pipe, in order to ensure The dense phase of pulverized coal has sufficient velocity after splitting, and the impact force of pulverized coal on the pipe wall at the elbow is extremely high, which requires high material requirements for the pipe wall, which will damage the life of the burner; the direct flow burner can fundamentally avoid the At present, there are various direct-flow thick-lean burners, which use the diverter block and the baffle at the thick-strand nozzle to separate the thick-lean particle flow, such as "multiple enrichment type direct-flow pulverized coal burner" (patent No. CN1439841), this The outlet airflow of the type burner is a straight jet, and the outlet is divided into a thick burner nozzle and a light strand burner in the horizontal direction. It is characterized by a small diffusion angle and a long range. The powder concentration effect is low or insignificant, especially for coal with low volatile content, the air volume during the combustion of pulverized coal in this airflow is still higher than or close to the air volume required for the combustion of volatile content in coal, and it is easy to produce NOx at the initial stage of combustion; In addition, compared with the swirling burner, the surrounding entrainment effect is small and there is no central backflow, which is not good for ignition and has poor combustion stability. In order to enhance combustion stability and combustion efficiency, ordinary direct-flow burners often use nozzles with flame stabilizers. The patent "a kind of coal powder decoupling burner with rich side classification" (patent number: CN202452487U), this design can not only improve The effect of decoupling combustion is simple in structure, and can be docked with different pulverized coal concentration devices, but the wear and pressure drop of the entire system equipment still need to be improved.
实用新型内容 Utility model content
为了进一步减少整个系统设备的磨损和压降,优化燃烧,本实用新型提供一种浓淡分级的煤粉低氮燃烧器。 In order to further reduce the wear and pressure drop of the whole system equipment and optimize the combustion, the utility model provides a pulverized coal low-nitrogen burner with graded concentration.
本实用新型采用的技术方案为: The technical scheme that the utility model adopts is:
一种浓淡分级的煤粉低氮燃烧器,包括燃烧器壳体,所述燃烧器壳体内设置有丘型浓淡挡块、喷头浓淡相隔板、丘型特浓相挡块、燃烧器喷口和水滴型引火稳焰器,所述丘型浓淡挡块有三个,呈阶梯状布设,所述丘型浓淡挡块后端设置有喷口浓淡相隔板,所述喷口浓淡相隔板上方设置有丘型特浓相挡块,所述丘型特浓相挡块后端设置有水滴型引火稳焰器,所述水滴型引火稳焰器的末端与燃烧器喷口边缘平齐。 A pulverized coal low-nitrogen burner with graded concentration, including a burner shell, and the burner casing is provided with a mound-shaped thick-lean stopper, a nozzle thick-lean phase partition, a mound-shaped extra-dense phase stopper, a burner nozzle and water droplets There are three mound-shaped thick-and-thick stoppers, which are arranged in a ladder shape. The rear end of the mound-shaped thick-thickness stop is provided with a spout thick-thin phase partition, and the top of the spout thick-thin phase partition is provided with a mound-shaped special thick block. A phase block, the rear end of the mound-shaped extra-dense phase block is provided with a water drop-type ignition flame stabilizer, and the end of the water drop-type ignition flame stabilizer is flush with the edge of the burner nozzle.
所述丘型浓淡挡块包括迎风面、背风面和底面,所述迎风面为直板或斜波浪板,所述背风面为内凹面板,所述底面与迎风面的夹角为20°-45°,所述迎风面和背风面相交处距底面的距离与底面水平截面的长度之比为1:2-4。 The mound-shaped shade block includes a windward side, a leeward side and a bottom surface, the windward side is a straight plate or an oblique corrugated board, the leeward side is a concave panel, and the angle between the bottom surface and the windward side is 20°-45° °, the ratio of the distance between the intersection of the windward side and the leeward side to the bottom surface and the length of the horizontal section of the bottom surface is 1:2-4.
所述三个丘型浓淡挡块的迎风面相互平行,前一挡块的背风面与后一挡块的迎风面水平位置相互重叠,重叠距离为底面水平截面长度的0-1/4倍,三个底面之间垂直方向距离为迎风面和背风面相交处距底面距离的1/3-1倍。 The windward sides of the three mound-shaped shade blocks are parallel to each other, the horizontal positions of the leeward side of the previous block and the windward side of the latter block overlap each other, and the overlapping distance is 0-1/4 times of the horizontal section length of the bottom surface, The vertical distance between the three bottom surfaces is 1/3-1 times of the distance between the intersection of the windward side and the leeward side to the bottom surface.
所述喷口浓淡相隔板的上部为浓相出口,下部为稀相出口,所述喷口浓淡相隔板中部弯折,使浓相出口由燃烧器喷口至燃烧器中心逐渐缩小,所述稀相出口在燃烧器喷口处被压缩。 The upper part of the dense-phase separation plate of the nozzle is the dense-phase outlet, and the lower part is the dilute-phase outlet. The middle part of the dense-phase separation plate of the nozzle is bent so that the dense-phase outlet gradually shrinks from the burner nozzle to the center of the burner. The dilute phase outlet is Compressed at the burner nozzle.
所述丘型特浓相挡块的形状与丘型浓淡挡块相同,体积为丘型浓淡挡块的0.8倍。 The shape of the hill-shaped extra-dense phase block is the same as that of the hill-shaped thick-shade block, and its volume is 0.8 times that of the hill-shaped thick-shade block.
所述水滴型引火稳焰器为前端尖、末端圆的形状,所述水滴型引火稳焰器将浓相出口分割为两部分,上部为特浓相出口,下部为次稀相出口。 The drop-type ignition flame stabilizer has a sharp front end and a round end. The water drop-type ignition flame stabilizer divides the dense phase outlet into two parts, the upper part is the extra dense phase outlet, and the lower part is the second dilute phase outlet.
所述燃烧器壳体为长方体,所述喷口浓淡相隔板前端对应的燃烧器壳体为规则长方体,规则长方体后端在垂直方向逐渐变大,燃烧器喷口处口径最大,呈喇叭状。 The burner housing is a cuboid, the burner housing corresponding to the front end of the thick-thin phase partition plate of the nozzle is a regular cuboid, the rear end of the regular cuboid gradually becomes larger in the vertical direction, and the nozzle of the burner has the largest caliber and is trumpet-shaped.
所述丘型浓淡挡块和丘型特浓相挡块均可绕本体中心垂线转动。 Both the mound-shaped dark-light stopper and the mound-shaped extra-dense phase stopper can rotate around the vertical line at the center of the body.
与现有技术相比本实用新型所具有的有益效果为: Compared with the prior art, the utility model has the beneficial effects as follows:
1、本设计不但保留了直流燃烧器结构简便、射程远和旋流燃烧器燃烧稳定、炉膛不易结渣腐蚀的双重优势;而且,通过三块丘型挡块的一次浓淡分流和丘型特浓相挡块和水滴型稳焰器的二次浓淡分流,可使局部煤粉气流达到特浓的浓缩效果; 1. This design not only retains the dual advantages of simple structure, long firing range, stable combustion of the swirl burner, and the furnace is not easy to slagging and corrosion of the direct-flow burner; The secondary thick-lean flow separation of the phase block and the drop-shaped flame stabilizer can make the local pulverized coal flow achieve an extremely thick concentration effect;
2、本设计通过喷口浓淡相隔板和水滴型稳焰器的双重作用,增加浓稀两相之间的分离距离,延长浓稀两相混合的时间,强化偏差燃烧,强化抑制NOx形成的效果; 2. This design increases the separation distance between the thick and thin phases, prolongs the mixing time of the thick and thin phases, strengthens the deviation combustion, and strengthens the effect of suppressing the formation of NOx through the dual functions of the thick-lean phase partition plate at the nozzle and the drop-shaped flame stabilizer;
3、本设计的水滴型引火稳焰器,利用圆滑壁面引流的作用,能更好地卷吸燃烧器口的热空气进入燃烧器,从而使得高灰分、低挥发分的难燃煤及时着火,与空气适时混合,保证燃烧的稳定性和经济性; 3. The water-drop type ignition and flame stabilizer of this design can better entrain the hot air from the burner port into the burner by using the function of smooth wall drainage, so that the refractory coal with high ash content and low volatile content can be ignited in time. Mix with air in time to ensure the stability and economy of combustion;
4、本设计中燃烧器喷口呈喇叭状,结合丘型挡块、喷口浓淡相隔板、特浓相挡块和水滴型引火稳焰器所形成的三股煤粉流的分布,充分延长特浓相与稀相的混合时间,强化解耦燃烧,进一步降低燃烧中产生的NOx; 4. In this design, the nozzle of the burner is trumpet-shaped, combined with the distribution of the three pulverized coal flows formed by the mound-shaped block, the thick-lean phase partition plate of the nozzle, the special-dense phase block and the drop-shaped ignition flame stabilizer, the special-dense phase can be fully extended. The mixing time with the dilute phase strengthens the decoupling combustion and further reduces the NOx produced in the combustion;
5、本设计中各丘型挡块迎风板与煤粉流夹角可灵活调节,可适应不同锅炉负荷和不同煤种的变化; 5. In this design, the angle between the windward plate of each mound block and the pulverized coal flow can be adjusted flexibly, which can adapt to the changes of different boiler loads and different coal types;
6、本设计中丘型浓淡挡块的结构,能减少煤粉回流对挡板的冲击,增强其稳定性,延长其使用寿命; 6. The structure of the mound-shaped thick-thin block in this design can reduce the impact of pulverized coal backflow on the baffle, enhance its stability and prolong its service life;
7、本设计结构简单,运行可靠,不容易烧坏和磨损,便于维护和检修。 7. The design is simple in structure, reliable in operation, not easy to burn out and wear out, and easy to maintain and overhaul.
附图说明 Description of drawings
下面通过附图对本实用新型的具体实施方式作进一步详细的说明。 The specific embodiment of the utility model will be described in further detail below by means of the accompanying drawings.
图1为本实用新型的结构示意图; Fig. 1 is the structural representation of the utility model;
图2为本实用新型丘型块的示意图; Fig. 2 is the schematic diagram of the utility model mound block;
图3为本实用新型丘型块的立体图。 Fig. 3 is a perspective view of the mound block of the present invention.
图中:1为燃烧器壳体、2为丘型浓淡挡块、3为喷头浓淡相隔板、4为丘型特浓相挡块、5为燃烧器喷口、6为水滴型引火稳焰器、7为迎风面、8为背风面、9为底面、10为迎风面和背风面的相交处、11为迎风面和背风面的相交处距底面的距离、12为丘型挡块中心垂线、13为浓相出口、14为稀相出口、15为特浓相出口、16为次稀相出口。 In the figure: 1 is the burner shell, 2 is the mound-shaped thick-lean stopper, 3 is the thick-lean phase partition of the nozzle, 4 is the mound-shaped extra-dense phase stopper, 5 is the burner nozzle, 6 is the water drop type ignition flame stabilizer, 7 is the windward side, 8 is the leeward side, 9 is the bottom surface, 10 is the intersection of the windward side and the leeward side, 11 is the distance from the bottom surface to the intersection of the windward side and the leeward side, 12 is the center vertical line of the hill block, 13 is a dense phase outlet, 14 is a dilute phase outlet, 15 is an extra dense phase outlet, and 16 is a sub-dilute phase outlet.
具体实施方式 detailed description
下面实施例结合附图对本实用新型作进一步的描述。 The following embodiments will further describe the utility model in conjunction with the accompanying drawings.
如图1所示,一种浓淡分级的煤粉低氮燃烧器包括:燃烧器壳体1,三个丘型浓淡挡块2,喷口浓淡相隔板3,丘型特浓相挡块4,燃烧器喷口5和水滴型引火稳焰器6。 As shown in Figure 1, a pulverized coal low-nitrogen burner with density classification includes: burner housing 1, three mound-shaped thick-lean stoppers 2, spout thick-lean phase partitions 3, mound-shaped extra-dense phase stoppers 4, combustion Device spout 5 and water drop type ignition flame stabilizer 6.
如图2所示,所述丘型浓淡挡块2的迎风面7为直板,背风面8为内凹面,底面9与迎风面7呈20°-45°,丘型截面底边9距两面交点间距离11与底边9长度之比宜在1:2至1:4之间;该丘型挡块可绕体中心垂线(Y方向)12转动(见图3),以调节迎风面7与煤粉流之间角度;所述丘型浓淡挡块2在燃烧器壳体1内有三块,呈阶梯状布设;三挡块迎风面7互相平行,前一挡块的背风面8与后一挡块的迎风面水平位置(X轴方向)相互重叠,重叠距离为丘型截面底边9长度的0-1/4,挡块底面之间距离为丘型截面底边9到迎、背风面交点10之间距离11的1/3-1。 As shown in Figure 2, the windward side 7 of the mound-shaped shade block 2 is a straight plate, the leeward side 8 is an inner concave surface, the bottom surface 9 and the windward side 7 are at 20°-45°, and the bottom edge 9 of the mound-shaped cross-section is separated from the intersection point of the two surfaces. The ratio between the distance 11 and the length of the bottom edge 9 should be between 1:2 and 1:4; the mound block can rotate around the vertical line (Y direction) 12 of the body center (see Figure 3) to adjust the windward surface 7 Angle with the pulverized coal flow; the mound-shaped thick-thin block 2 has three blocks in the burner shell 1, which are arranged in a ladder shape; the windward sides 7 of the three blocks are parallel to each other, and the leeward side 8 of the previous block is parallel to the rear The horizontal position of the windward side (X-axis direction) of a block overlaps with each other, and the overlapping distance is 0-1/4 of the length of the bottom edge 9 of the hill-shaped section, and the distance between the bottom surfaces of the blocks is from the bottom edge 9 of the hill-shaped section to the windward and leeward sides. 1/3-1 of the distance 11 between the intersection points 10.
所述的喷口浓淡相隔板3将浓淡两相粉体分开为浓淡两股;该挡板中部弯折,使浓相出口13由燃烧器喷口5至燃烧器中心逐渐缩小,而稀相出口14则在燃烧器喷口5处被压缩。 The thick and light phase partition plate 3 of the spout separates the two phase powders into two thick and light strands; the middle part of the baffle is bent so that the dense phase outlet 13 gradually shrinks from the burner nozzle 5 to the burner center, while the dilute phase outlet 14 is It is compressed at the burner nozzle 5.
所述丘型特浓相挡块4形状与丘型浓淡挡块2相同,尺寸是丘型浓淡挡块2的0.8倍;该丘型特浓相挡块4位于浓相出口13一侧,可以通过旋转,调节迎风面与煤粉流之间的角度。 The shape of the hill-shaped extra-dense phase block 4 is the same as that of the hill-shaped thick-shape block 2, and its size is 0.8 times that of the hill-shaped thick-shape block 2; By rotating, the angle between the windward side and the pulverized coal flow is adjusted.
所述的水滴型引火稳焰器6位于浓相出口13中心处;沿煤粉流方向,该引火稳焰器6呈前端尖,末端圆的形状;圆端与燃烧器喷口5边缘平齐。该引火稳燃器6将浓相出口13分隔为靠近壳体外侧的特浓相出口15和靠近燃烧器喷口5中心的次稀相出口16两股。 The drop-type ignition flame stabilizer 6 is located at the center of the dense phase outlet 13; along the direction of the pulverized coal flow, the ignition flame stabilizer 6 is in the shape of a sharp front end and a round end; the round end is flush with the edge of the burner nozzle 5 . The ignition and stabilizing burner 6 divides the dense phase outlet 13 into two streams: an extra dense phase outlet 15 near the outside of the shell and a sub-dilute phase outlet 16 near the center of the burner nozzle 5 .
所述燃烧器壳体1为长方体筒形,其中沿煤粉前进方向,前半段为规则长方体,而由喷口浓淡相隔板3前端开始,壳体沿(Y方向)高度不变,但沿煤粉流动方向的垂线方向(Z方向)逐渐变大,燃烧器喷口5处口径最大,燃烧器喷口5呈喇叭状。 The burner housing 1 is in the shape of a rectangular parallelepiped, and the first half of it is a regular rectangular parallelepiped along the advancing direction of the pulverized coal. Starting from the front end of the thick-thin phase partition plate 3 at the nozzle, the height of the housing along (Y direction) remains the same, but along the pulverized coal The vertical direction of the flow direction (Z direction) gradually becomes larger, and the caliber of the burner nozzle 5 is the largest, and the burner nozzle 5 is trumpet-shaped.
下面通过具体的实施例来进行说明,以使本实用新型的技术方案能够更加容易理解。 The following will be described through specific embodiments, so that the technical solution of the present utility model can be understood more easily.
具体实施例如下:通过外部煤粉输送管道输送进燃烧器壳体1内的煤粉流首先流经三级丘型挡块2。煤粉颗粒撞击丘型挡块的迎风面7,惯性和弹性碰撞使得煤粉颗粒向迎风面7上方反弹,因此煤粉颗粒被丘型挡块的斜面引导,逐级向迎风面7斜面所指方向前进,最终进入喷口浓淡相隔板3上方的浓相出口13;而质量小的空气受到挡块的影响比较小,可以通过缝隙流动,因此一部分空气沿丘型挡块底面9流入喷口浓淡相隔板3下方的稀相出口14;由此,经过三级丘型挡块2的分隔阻挡作用,使煤粉流得到一次浓淡分离。 A specific embodiment is as follows: the pulverized coal flow that is transported into the burner housing 1 through the external pulverized coal delivery pipeline first flows through the three-stage mound block 2 . The pulverized coal particles hit the windward side 7 of the mound-shaped block, and the inertial and elastic collisions cause the pulverized coal particles to rebound to the top of the windward side 7. Therefore, the pulverized coal particles are guided by the slope of the mound-shaped block, and move toward the slope of the windward side 7 step by step. direction, and finally enter the dense phase outlet 13 above the thick-lean phase partition plate 3 of the nozzle; while the air with low mass is less affected by the block and can flow through the gap, so part of the air flows into the dense-phase partition plate of the nozzle along the bottom surface 9 of the mound-shaped block 3 below the dilute phase outlet 14; thus, through the separation and blocking effect of the three-level mound block 2, the pulverized coal flow is separated from the thick and thin.
经过一次浓淡分离的煤粉流流入喷口浓淡相隔板3上方的浓相出口13后,又遇到丘型特浓相挡块4的分隔阻挡,得到二次浓淡分离。经过二次浓淡分离的特浓相又经过水滴型稳焰器6的浓侧斜面引流和压缩,最终由喷口特浓相出口15喷入炉膛高温区中;而由水滴型稳焰器6另一侧流出的气流则含有极少的煤粉,因而称为次稀相出口16。该相由喷口中心处流出,将特浓相与稀相分隔开来。 After the pulverized coal flow through the first thick-lean separation flows into the dense phase outlet 13 above the thick-lean phase partition plate 3 of the spout, it encounters the separation barrier of the mound-shaped extra-dense phase stopper 4 to obtain a second thick-lean separation. The extra-dense phase that has undergone the secondary concentration separation is drained and compressed by the thick side slope of the droplet-shaped flame stabilizer 6, and finally sprayed into the high-temperature zone of the furnace through the outlet 15 of the nozzle-type flame stabilizer 6; The airflow flowing out from the side contains very little coal powder, so it is called the sub-dilute phase outlet 16 . This phase flows out from the center of the nozzle, separating the very dense phase from the dilute phase.
特浓煤粉气流流经所述设置水滴型引火稳焰器6时,由于水滴型斜坡壁面的结构,使浓相流通道内形成靠近喷口外壳体的外侧气流煤粉浓度更高、流速更快、靠近喷口内中心的煤粉浓度和流速呈相应降低的趋势;由于水滴型引火稳焰器6在喷口处为圆弧型,对炉膛内的高温气流有引流作用,在燃烧器喷口5处形成更大的回流空间,使从炉膛回流的热烟气量更大,而且喷口外壳体外侧特浓煤粉气流更容易和热烟气相接处,使煤粉热解和燃烧速度更高。 When the ultra-concentrated pulverized coal airflow flows through the water drop type ignition flame stabilizer 6, due to the structure of the water drop type slope wall, the outer air flow near the outer shell of the spout is formed in the dense phase flow channel. The concentration of pulverized coal is higher, the flow velocity is faster, The concentration and flow rate of pulverized coal close to the center of the nozzle show a corresponding decrease trend; since the droplet-type ignition flame stabilizer 6 is arc-shaped at the nozzle, it has a drainage effect on the high-temperature airflow in the furnace, forming a more The large backflow space makes the amount of hot flue gas returning from the furnace larger, and the extra-concentrated pulverized coal airflow outside the outer shell of the nozzle is easier to connect with the hot flue gas, so that the pulverized coal pyrolysis and combustion speed are higher.
该设计通过两次浓淡分离和喷口处水滴型稳焰器6的分流,将煤粉流分为特浓相、次稀相和稀相三股,其中次稀相将特浓相与稀相相隔开,加长特浓相与稀相的距离,延长特浓相与稀相混合的时间;同时,由于喷口浓淡相隔板3中部弯折,使浓相由燃烧器喷口5至燃烧器中心逐渐缩小,而稀相则在燃烧器喷口5被压缩,再加上燃烧器喷口5的喇叭状结构,更强化了延迟特浓相与稀相的混合。这样配合四角切圆或多角切圆的燃烧方式,使特浓相喷入炉膛中心高温区,而稀相则沿炉膛中心燃烧区外侧切圆进入炉膛燃烧,形成逐级点火的燃烧过程。进入炉膛中心区的特浓相煤粉气流温度急速升高,煤粉发生快速热解、气化、燃烧,由于特浓煤粉气流含氧量极低,煤热解气化后释放出CO、碳氢化合物等强还原性气体,可将该阶段生成的NOx,大量转化为N2。特浓相气流燃烧后,相继与次稀相和稀相逐步混合,并燃烧。在燃烧区边缘可补充适当二次风,以保证煤粉的燃烧效率。 This design divides the pulverized coal flow into three streams: ultra-concentrated phase, sub-dilute phase and dilute phase through two thick-lean separations and the diversion of the drop-shaped flame stabilizer 6 at the nozzle. The sub-dilute phase separates the ultra-concentrated phase from the dilute phase. Open, lengthen the distance between the super-dense phase and the dilute phase, prolong the mixing time of the extra-dense phase and the dilute phase; at the same time, because the middle part of the thick-lean phase partition plate 3 of the nozzle is bent, the dense phase gradually shrinks from the burner nozzle 5 to the burner center, The dilute phase is compressed at the burner nozzle 5, and the trumpet-shaped structure of the burner nozzle 5 further strengthens the mixing of the delayed extra-dense phase and the dilute phase. In this way, combined with the combustion method of four-corner tangential circle or multi-corner tangential circle, the super-dense phase is sprayed into the high-temperature zone in the center of the furnace, while the dilute phase enters the furnace for combustion along the outer tangential circle of the central combustion zone of the furnace, forming a combustion process of step-by-step ignition. The temperature of the ultra-dense phase pulverized coal flow entering the central area of the furnace rises rapidly, and the pulverized coal undergoes rapid pyrolysis, gasification, and combustion. Since the oxygen content of the ultra-concentrated pulverized coal flow is extremely low, the coal is released after pyrolysis and gasification. Strong reducing gases such as hydrocarbons can convert a large amount of NOx generated in this stage into N 2 . After burning, the ultra-dense phase airflow gradually mixes with the next dilute phase and the dilute phase, and burns. Appropriate secondary air can be supplemented at the edge of the combustion zone to ensure the combustion efficiency of pulverized coal.
本实用新型所述的丘型挡块的迎风面7也可以为斜波浪等形式,只要可以起到阻挡和引导煤粉流向的作用即可。 The windward surface 7 of the mound-shaped block described in the utility model can also be in the form of oblique waves, as long as it can block and guide the flow of pulverized coal.
本实用新型所述丘型挡块大小、个数、相对布置位置可以根据燃煤品种以及燃烧器的尺寸和结构进行调整,适应不同的运行情况。 The size, number and relative arrangement position of the hill-shaped stoppers in the utility model can be adjusted according to the type of coal and the size and structure of the burner, so as to adapt to different operating conditions.
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Cited By (3)
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CN108151014A (en) * | 2018-01-03 | 2018-06-12 | 哈尔滨工业大学 | A kind of lower resistance louver pulverized coal concentrator with triangular prism structure concentration grid |
CN109442396A (en) * | 2018-11-28 | 2019-03-08 | 华北电力大学 | A kind of horizontal and Louver type concentrated diluted pulverized coal burner |
CN112368513A (en) * | 2018-04-06 | 2021-02-12 | 资科公司 | Low NOx burner and flow momentum enhancing device |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108151014A (en) * | 2018-01-03 | 2018-06-12 | 哈尔滨工业大学 | A kind of lower resistance louver pulverized coal concentrator with triangular prism structure concentration grid |
CN112368513A (en) * | 2018-04-06 | 2021-02-12 | 资科公司 | Low NOx burner and flow momentum enhancing device |
CN112368513B (en) * | 2018-04-06 | 2023-12-05 | 资科公司 | Low NOx burner and flow momentum enhancing device |
CN109442396A (en) * | 2018-11-28 | 2019-03-08 | 华北电力大学 | A kind of horizontal and Louver type concentrated diluted pulverized coal burner |
CN109442396B (en) * | 2018-11-28 | 2024-06-04 | 华北电力大学 | Shutter type horizontal thick and thin pulverized coal burner |
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