摆动式燃烧器的试验研究

本文介绍了摆动式燃烧器短喷嘴结构冷态模拟试验结果,以及中间工业试验和热态运行试验结果。研究了短喷嘴的气流特性、摆动燃烧对锅炉汽温的影响。以及摆动式燃烧器本身运行的特点与可靠性。同时对短喷嘴摆动式燃烧器的某些结构设计提出了建议。     

锅炉摆动式燃烧器喷嘴角度的调整步骤及影响因素

本文详细介绍了摆动式燃烧器喷嘴角度的调整步骤,并总结罗列了影响喷嘴角度调整的因素及处理措施,为基建期和投产后的锅炉摆动燃烧器的喷嘴角度调整提供依据和参考.     

1025t/h控制循环锅炉燃烧器摆动调温研究

1025t／b控制循环锅炉采用燃烧器喷嘴摆动调节过热蒸汽和再热蒸汽温度。锅炉投运后曾经发生燃烧器喷嘴摆动装置故障，不起调温作用，汽轮机高压缸排汽温度比设计值高10～20℃，被迫采取各用事故喷水调节再热蒸汽温度。锅炉再热器受热面偏大；使再热器减温水量比设计值多20-30tt/h，明显影响机组运行经济性。通过调查研究和实炉试验，对摆动机构采取改进措施。现在燃烧器喷嘴已能正常摆动，找到了减少再热器减温水量的途径。     

摆动式燃烧器的试验研究

阐述了摆动式燃烧器的国内外情况及其应用的经济价值,说明了东锅短喷嘴摆动式燃烧器的冷态模拟试验结果,以及中间工业     

大容量锅炉燃烧器摆动改进

上海锅炉厂引进CE技术初期,燃烧器喷嘴摆动曾存在较大的质量问题。本文总结了解决这一质量问题的主要经验,对CE型燃烧器摆动机构作了客观的评述。     

燃烧器喷嘴热态摆动的可靠性和灵活性

对引进ABB -CE公司燃烧器摆动技术初期燃烧器喷嘴热态摆动产生的问题进行了分析 ,采取了相关改进措施 ,并成功地应用到 1 995年以后设计的配直吹式制粉系统的 1 0 2 5t/h和 2 0 0 8t/h锅炉上 ,取得了良好的效果。     

关于送粉管道设计中的几个问题

本文简述了送粉管道目前在电厂运行中存在的设计布置问题。风量分配不均匀问题,煤粉泄漏问题,以及影响燃烧器喷嘴摆动的原因提出了解决这些问题的建议。     

引进30万千瓦电站锅炉摆动燃烧器调温性能试验研究

本文提出,上海锅炉厂引进美国燃烧工程公司技术生产的30万千瓦机组的电站锅炉,采用了摆动式燃烧器,可以利用燃烧器喷嘴摆角的变化来调节锅炉蒸汽温度。这种方法有其优点,并在汽温偏低时行之有效,可以提高机组的经济性。     

摆动式煤粉燃烧器热态摆动的要点

长期来,燃烧器喷嘴摆动总成为一个问题,其所以成为一个问题,有制造厂的主观原因,也有其他客观因素。经过制造厂、电厂、设计院共同的努力,这一问题是不难获得解决的。     

一种摆动式燃烧器摆动装置的检修方法

本文介绍了切圆锅炉一种摆动式燃烧器摆动装置的检修方法,重点介绍了燃烧器摆动装置的工作原理、检修步骤、检查问题及分析处理,旨在彻底消除各种引起燃烧器上下摆动障碍的因素,使燃烧器摆动性能得以稳定发挥,最终在锅炉调试及运行阶段,燃烧器摆动功能可以作为调节再热器汽温及降低锅炉出口NOx排放值的手段加以灵活运用。该方法也可以为同类设备的检修维护工作提供一定的参考。     

基于内模控制器的再热汽温控制应用

再热汽温控制始终是火电厂运行控制的难点,减少再热器减温水的用量对提高机组的热经济性有十分重要的意义。文中采用燃烧器摆角和再热器喷水减温联合调整再热汽温的控制策略,其中燃烧器摆角调节控制器采用内模控制器IMC以提高其控制性能。在某电厂300MW机组上进行再热汽温优化控制系统试验,试验结果表明IMC内模控制器更好地解决大时滞问题,联合控制策略可极大地降低减温水投放量。     

超临界锅炉高温受热面屏间热偏差在线优化研究

以锅炉过热器、再热器热偏差计算方法为基础,采用全局寻优方法,根据当前的负荷、磨煤机组合、燃烧器摆角、各层配风方式、末级过热器和再热器热偏差状况,对运行状况进行优化评判,从而降低管壁温度峰值,控制管壁超温幅度和超温时间,进而减缓氧化皮的生成速度,使锅炉运行的安全性和经济性得到双重保证.通过在某600 MW超临界锅炉上的在线优化运行,表明锅炉末级过热器屏间热偏差系数最大约为1.2,比以往的最大热偏差系数下降了10%.     

Experimental study of the combustion efficiency and formation of NOx in an industrial pulverized coal combustor

With horizontal bias combustion burners, experiments have been carried out on a 670 t h^?1, corner‐fired, pulverized‐coal fired boiler burning bituminous coal. At 200 MWe load, the furnace excess O₂ remains stable. The different horizontal fuel biases are obtained by changing the tilt angle of all the Louvre enrichers' regulating blades. The tilt angles of the blades are 0, 15, 24, 32°; the result is that the enriching ratios of the fuel‐rich primary air increase from 2.2 to 2.6 at No. 2 corner, and from 1.2 to 4.2 at No. 3 corner. The gas temperature increases in the burner region. The application of the horizontal bias combustion burners results in a reduction in NO_x formation from 545.7 mg Nm^?3 (O₂=6%) to 287.9 mg Nm^?3, and a substantial reduction in carbon in ash content from 5.24 to 2.48%. The boiler operated stably at a load of 80 MWe without auxiliary fuel oil. Copyright © 2004 John Wiley & Sons, Ltd.     

某电厂220t/h锅炉煤粉燃烧器改造设计方案

为提高某电厂220t/h煤粉锅炉燃烧器低负荷稳燃能力，拟采用浓淡燃烧技术对该炉燃烧器进行改造；下层燃烧器采用水平浓淡燃烧器，上层燃烧器采用上下浓淡燃烧器；为保证低负荷时的主蒸汽温度，上层燃烧器为摆动式燃烧器。     

采用旋流拱顶燃烧器的W型锅炉炉内流动特性

采用旋流燃烧器,可以强化燃烧器出口煤粉气流的着火,配合采用燃烧器内部分级燃烧方式后,也有利于降低污染气体的排放。但采用旋流燃烧器后,由于W型锅炉燃烧的特殊性,给锅炉的设计和运行带来了新的情况,如对旋流燃烧器在W型锅炉拱顶采用旋流燃烧器后炉内的空气动力特性不能很好得到掌握,不但得不到旋流燃烧器所带来的优点,还会引起很多问题。本文对采用旋流燃烧器的W型锅炉的炉内多相流动特性进行分析,并与相应的采用直流燃烧器的W型锅炉进行对比,指出在采用直流燃烧器的W型锅炉设计中常采用的参数在采用旋流燃烧器时可能会出现的问题,并提出了改进的方法。     

Bituminous coal combustion in a full-scale start-up ignition burner: Influence of the excess air ratio

A start-up ignition burner has been proposed to reduce oil fuel consumption during the firing-up process and partial-load operation. To investigate the influence of different excess air ratios on bituminous coal combustion in the start-up ignition burner, full-scale reacting-flow experiments were performed for an experiment setup. The ignition burner was identical to that normally used in an 800 MWe utility boiler. Gas temperature distributions in the burner were obtained for excess air ratios of 0.56, 0.75, 0.98 and 1.14 (corresponding to primary air velocities of 17, 23, 30 and 35 m/s). Coal burnout and the release of C and H were observed at the exit of the burner nozzle. Gases such as O₂ and CO were measured at the center of the burner. A change in resistance was obtained within the burner.     

扬州第二发电厂600MW机组锅炉燃烧器的调整试验研究

分析了美国B&W公司设计制造的600MW机组锅炉DRB-XCL型低NOX双调风燃烧器的结构特点,通过燃烧器冷热态试验,全面掌握DRB-XCL型低NOX双调风燃烧器的运行特性。从燃烧器试验结果看,这种DRB-XCL型低NOX双调风燃烧器具有燃烧效率高、对煤种适应性广、NOX生成水平低、低负荷稳燃能力强的特点。采用合理的运行方式,锅炉效率达到93.9%。对DRB-XCL型燃烧器的试验研究结果,可为我国旋流燃烧器的设计和技术改造提供参考。     

低热值煤层气燃烧器的数值模拟

对一种低热值煤层气燃烧器进行了全尺寸的三维燃烧数值模拟研究,预测了燃烧器出口的流场、温度和组分分布情况,并考察了不同热负荷和不同喷口形式对燃烧器性能的影响。结果表明该燃烧器具有较宽的负荷调节能力,渐缩喷口燃烧器燃烧温度最高且射流刚性好,50%~100%热负荷内渐扩喷口燃烧器燃烧性能最佳,25%热负荷下渐缩喷口燃烧器燃烧性能最佳。模拟结果对该燃烧器的进一步优化设计有一定的指导意义。     

A fibre‐mat catalytic burner for the heating system of PVC tiles

This study aims to develop the low‐temperature catalytic burner using Al₂O₃ fibre and Pt catalyst as a substrate and an active material, respectively, and then to apply it to the heating system of PVC tiles. Three types of fibre‐mat catalytic burners—natural diffusion catalytic burner, forced diffusion catalytic burner and premixed catalytic burner—were tested. For the natural diffusion catalytic burner, the combustion efficiency was significantly affected by the installation method. Its combustion efficiency was above 99.5% when it was placed vertically and upward, whereas the combustion efficiency rapidly deteriorated to less than 80% when it was installed in downward position. When the forced diffusion combustion mode was employed, the combustion efficiency of the fibre‐mat catalytic burner was successively improved over 99.5%. The optimal operation condition of the premixed fibre‐mat catalytic burner was obtained when the excess air ratio is 4.3 and the heat load is 3.0 kcal h^?1 cm^?2. The heat load of the premixed catalytic burner was found to be twice as much as those of the natural and forced diffusion catalytic burner, meaning that the size of the catalytic burner can be reduced to its half if the premixed catalytic burner is used. We also performed the field test of the fibre‐mat catalytic burner in the heating system of the PVC tiles. The combustion efficiency of the catalytic burners appeared to be satisfactory, above 99.5%, and the energy saving by replacing the existing electrical heaters with the fibre‐mat catalytic burners were shown to be 27.7%. Copyright © 2002 John Wiley & Sons, Ltd.     

煤粉炉微油点火燃烧器设计

介绍了对一台容量为50WM锅炉的煤粉燃烧器的改造过程。根据燃烧理论,将原来的煤粉燃烧器改造成了微油点火燃烧器,并介绍了燃烧器的设计思想,以及小油枪的计算方法。微油点火燃烧器采用了分级燃烧方式和二次风冷却技术,能够很好起到稳燃和冷却的作用。改造后的效果表明该燃烧器锅炉启停速度快,燃烧稳定,节约燃油,降低了生产成本。