天然气平焰烧嘴的研究

总结、叙述了DNGP-100天然气平焰烧嘴试验研究结果。研究了此烧嘴的平焰直径和厚度，讨论了回流区的最大直径和长度的变化，试验研究了回流区中心线上的负压分布。     

自身预热式Ⅰ型辐射管烧嘴降低NO_x排放试验研究

对自身预热式Ⅰ型辐射管烧嘴结构及NO_x生成原因进行介绍,通过热态试验测试对烧嘴降低NO_x排放的方法进行分析,得出不同烟气回流率对烧嘴降低NO_x排放的影响效果。分析MnO_x模式原理,得出烧嘴高温应用MnO_x燃烧模式对NO_x排放的抑制作用。对比两种不同直径辐射管高温应用NO_x排放指标,得出烟气回流和MnO_x技术叠加使用时烧嘴高温NO_x排放指标。     

WZ003039燃烧室内燃料着火浓度界限区的研究——《тегчоэнергетика》

对燃料与空气混合物的着火浓度界限区和着火过程进行了数学描述和计算，对燃烧反应物和燃烧室结构参数的影响进行了研究。根据计算和测量结果做出了各因素影响的曲线图。从中可以看出，提高空气的温度和压力、增加燃烧室的直径，可增大界限区；增加雾化颗粒直径和单位面积上烧嘴的数目，会使着火浓度界限区变小。图7参7     

高压雾化柴油烧嘴的研制及应用

该烧嘴自带燃烧室，用压缩空气作雾化剂，在烧嘴内与柴油先混合，然后利用其二次临界膨胀产生的高速对柴油进行剪切，保证了燃油的良好雾化。同时合理地组织助燃空气的流动，在烧嘴内形成一个稳定火焰的回流区，并将空气引入燃烧室，使空气与燃料炬良好混合与稳定燃。该烧嘴具有点火方便、燃烧稳定、燃烧效率高、调节比大、调温范围宽、污染小等优点，特别适用于中低温炉。该烧嘴可燃烧重油、渣油等，或用蒸汽雾化。     

一种窑炉燃烧器的改型实践

燃烧室的工作与燃油雾化质量以及燃油和空气的混合状况密切相关。为了稳定火焰,设计时还应采取措施建立起局部回流区,以形成“自动点火源”。某厂从日本引进的陶瓷隧道窑,采用了直流突扩燃烧器(见图1),以柴油为燃料。燃油喷口处的二次风通道直径为55mm,直流式燃油喷嘴,并以弱旅一次风气动雾化。这种设计方案结构简单,利用烧嘴砖周边的突扩回流区建立起自动点火源,借此稳定火焰。实践表     

辐射管低NO_x燃烧技术研究

低NO_x燃烧是清洁燃烧技术研究的热点方向,辐射管由于燃烧空间受限,容易产生局部高温,为此NO_x排放一直比较高,近年来烟气回流式低NO_x燃烧技术应用效果显著,对辐射管应用烟气回流技术进行了研究,并进行了新旧烧嘴的燃烧对比测试,取得了较好的试验效果。     

叶片数量和一次风率对双调风旋流燃烧器流场的影响

在冷态实验台和两台1025t/h锅炉上,利用等温模化方法对双调风旋流燃烧器的空气动力特性进行了冷态试验。试验表明:具有12个内二次风叶片的双调风旋流燃烧器回流区最大直径、长度与燃烧器最外层直径之比分别在1.38、1.48以上,扩展角大于80°,可卷吸足够的高温烟气及时引燃煤粉;在具有8个内二次风叶片时,没有回流区,扩展角在61.9°和69.5°之间,不利于稳定燃烧。采用较低的一次风率具有较大的回流区,有利于稳定燃烧。     

一种窑炉燃烧器的改型实践

一、前言燃烧室的性能与燃油雾化质量,以及燃油和空气的混合状况密切相关。为了稳定火焰,设计时还应采取措施建立起局部回流区,以形成“自动点火源”。某厂从日本引进的陶瓷隧道窑,采用了直流突扩燃烧器见图1,以柴油为燃料。燃油喷口处的二次风通道直径为55mm,直流式燃油喷嘴,并以弱旋一次风气动雾化。这种设计方案结构简单,利用烧嘴砖周边的突扩回流区建立起自动点火源,借此稳定火焰。实践表明,以柴油当燃料时,可以维持稳定的燃烧,但不适     

确定烧嘴砖火口直径对提高燃气锅炉热效率的重要意义

烧嘴砖的作用，是使煤气和助燃空气在烧嘴砖区域内充分接触混合，借助于烧嘴砖的高热，使煤气燃烧，但煤气种类不同，对烧嘴砖火口直径的要求也有很大区别，忽视这一点，会造成很大的热能损耗。     

双回流燃烧器实验研究与应用

本文针对国内电站锅炉燃用劣质煤所存在的着火困难、燃烧不稳定和燃烧效率低等问题，提出了能产生内回流区和外回流区的双回流新型结构直流燃烧器，分析讨论了它的实验室冷态试验和热态试验结果，介绍了这种燃烧器在工业应用中的情况。     

六角切圆锅炉燃烧器区域气固两相流场的试验研究

针对某六角切圆燃烧煤粉锅炉存在的受热面结渣问题，建立冷态试验台，采用三维粒子动态分析仪对燃烧器区域的气固两相流场进行测量，研究原始设计工况及加大上层燃烧器二次风假想切圆直径的改进工况下，燃烧器区域的气固两相速度场．试验研究表明，适当采用一、二次风同心双切圆布置形式，能有效改善炉内流场特性，从而抑制受热面结渣现象的发生．     

Influence of primary air ratio on flow and combustion characteristics and NOx emissions of a new swirl coal burner

Cold airflow experiments on a small-scale burner model, as well as in situ experiments on a centrally fuel-rich swirl coal combustion burner were conducted. Measurements were taken from within a 300 MW_e wall-fired pulverized-coal utility boiler installed with eight of centrally fuel-rich swirl coal combustion burners in the bottom row of the furnace during experiments. Various primary air ratios, flow characteristics, gas temperature and gas species concentrations in the burner region were measured. The results of these analyses show that with decreasing primary air ratio, the swirl intensity of air, divergence angles and maximum length and diameter of the central recirculation zone all increased, and the turbulence intensity of the jet flow peaked but decayed quickly. In the burner nozzle region, gas temperature, temperature gradient and CO concentration increased with decreasing primary air ratio, while O₂ and NO_x concentration decreased. Different primary air ratios, the gas temperatures and gas species concentrations in the side-wall region varied slightly.     

角置射流偏转的分析模型及应用

通过对角置切向燃烧炉膛中燃烧器射流微元体的受力分析,推导出燃烧器射流微元体运动的动量方程,从而建立了射流偏转的理论分析。此外,还分析研究了直流燃烧器喷口宽度,假想切圆直径,射流速度,炉内气流的旋转直径,间隙率,炉膛切角等因素对燃烧器射流偏转的影响规律。     

Diameter of alumina balls effect on stabilization operation region for a reciprocal flow burner

A reciprocal gas flow porous burner is computationally simulated for obtaining its stable operation region as function of equivalence ratio, filtration velocity and particle diameter, for two energy losses configurations schemes. Equivalence ratio and filtration velocity were considered over the range [0.1, 1.0] and [0.25, 1.0] (m/s). Lateral heat losses were studied at two scenarios: reactor coupled with and without heat exchangers. Results demonstrated increased stabilization in temperature profile, thus increased stabilization region for the reactor coupled with heat exchangers. Increase of particle diameter results in increased stabilization region for both energy losses schemes.     

Cold flow characteristics of a novel high-hydrogen Micromix model burner based on multiple confluent turbulent round jets

As a promising commercial hydrogen-rich gas turbine combustion technology, micro-mixing combustion has been characterized for its excellent performance with low NOx emissions. New flame stabilization mechanism of micro-mixing flames may produce new design criteria. In order to explore that, cold flow characteristics of a novel Micromix model burner based on multiple confluent round jets has been studied experimentally and numerically, which is considered to be the basis for the exploration. A three-dimensional laser Doppler velocimetry system (3D-LDV) was used to measure the flow field of the model burner. It was found that the cold flow characteristics of the burner were different from the twin plane jets, the twin round jets, and the low Reynolds number confluent round jets. Compared to which, the interior of the micro-mixing nozzle is at a very high turbulence intensity level, and the jets merging point of the burner moved upstream; however, the position of the combined point of the burner was close to the confluent round jets. There is no recirculation region between jets near the burner outlet when the nozzle spacing was equal to 3 times the nozzle diameter and the Reynolds number was less than 16,702. The steady computational Reynolds averaged equations (RANS) model results were used to compare with the experimental results. It was found that the RANS results can match the experimental results well, and the three RANS models predict the spatial mixing deficiency less than 1% at the outlet, indicating that the fuel and air were almost completely premixed uniformly.     

假想圆直径对六角燃烧器区域速度场影响的PDA试验研究

针对工程应用，首次将三维粒子动态分析仪（PDA）应用于六角切圆燃烧锅炉，测量烧器区域的速度场，安排了原设计工况和加大上层燃烧器二次风假想切圆直径的改进工况，对比分析，寻找试验原型受热面结渣的原因。     

1180℃烧结炉专用工装设计

燃气轮机零部件"火焰筒"陶瓷烘干以后需要在1180±10℃的烧结炉内进行烧结工序,火焰筒上除了两个直径35 mm的圆孔及底部的扇形孔内壁20 mm内没有陶瓷涂层外,其他位置均涂有W-200高温陶瓷涂层,没有涂层的区域为被保护区域,可以直接与工装接触,传统工装采用一个活动销、一个固定销结构,该结构可以有效固定"火焰筒",但是工件拆装不便,工装移动时工件发生摆动,难以保证不与陶瓷涂层接触。结合之前情况对工装结构和材料进行改进,通过软件三维仿真和高温试验,成功研制出一种新的工装,有效解决了不破坏陶瓷涂层,方便工件装卸,移动时稳定性好等问题。     

Influence of the outer secondary air vane angle on the gas/particle flow characteristics near the double swirl flow burner region

A three-component particle-dynamics anemometer is used to measure, in the near-burner region, the influence of the outer secondary air vane angle on the gas/particle flow characteristics of a double swirl flow burner, in conjunction with a gas/particle two-phase test facility. Velocities, particle volume flux profiles and normalized particle number concentrations were obtained. For three different outer secondary air vane angles, annular recirculation zones formed only in the region of r/d = 0.3-0.6 at x/d = 0.1-0.3. With a decreasing outer secondary air vane angle, the peaks of (RMS) root mean square axial fluctuation velocities, radial mean velocities near the wall, RMS radial fluctuation velocities and tangential velocities all increased, and the recirculation increased slightly. There was a low particle volume flux in the central zone of the burner. At x/d = 0.1-1.0, the profiles of particle volume flux had two peaks in the secondary air flow zone and near the wall, and the two peaks increased as the outer secondary air vane angle decreased. In the section x/d = 0.1-0.5, the particle diameter in the central zone of the burner was always less than the particle diameter at other locations.     

高炉煤气直流燃烧器的试验研究

对常规直流燃烧器和不同锥形半角的扩口直流燃烧器进行了高炉煤气稳燃试验,分析了高炉煤气的稳定着火原理、淬熄现象及脱火特性.结果表明:小内径直流燃烧器对燃烧具有强烈的淬熄作用;燃烧器类型对高炉煤气的脱火极限有较大影响,扩口直流燃烧器的脱火极限高于常规直流燃烧器.