共查询到20条相似文献,搜索用时 78 毫秒
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锅炉点火和稳燃装置—节油点火燃烧器 总被引:3,自引:0,他引:3
针对火电厂节约点火用油和提高调峰能力等问题,介绍一种新型节油点火燃烧器的结构和特点,经现场实际运行,该燃烧器可节约点火用油60~90%;可在低负荷稳定燃烧,并达到免维护水平。 相似文献
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研究水平浓淡煤粉燃烧器微油点火的运行参数对点火运行状态的影响,利用Fluent软件对煤粉点火燃烧过程进行了数值模拟研究。利用气相燃烧模拟采用二混合分数方法,数值模拟了燃烧器内煤和油2种燃料点火运行状态,得到了合理的煤粉浓淡和一次风速等数据,并与现场实测数据进行了比较分析。 相似文献
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介绍了交流等离子点火燃烧器在660MW直流锅炉上的应用情况,阐述了交流等离子点火燃烧器的工作原理,并以实例结合试验研究,讨论了煤粉质量分数、一次风量、二次配风方式对锅炉启动时的点火过程和火焰稳定性的影响,得到了交流等离子点火燃烧器运行的最佳煤粉质量分数、一次风量、二次配风方式,可以用于指导交流等离子点火燃烧器的实际运行。 相似文献
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少油点火双向稳燃煤粉燃烧器的研究与实践 总被引:1,自引:0,他引:1
针对电厂锅炉节约点火用油和提高锅炉低负荷稳燃问题,介绍一种少油点火双向稳燃煤粉燃烧器的结构和特点。经过电厂锅炉的实际运行考核,这种新型煤粉燃烧器可以节约点火用油45%以上,并可在42.5%ECR下断油稳定燃烧。 相似文献
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对用于330 MW锅炉的少油点火燃烧器建立了精细的物理模型,建模包括了一次风和周界风流动区域以及燃烧器壁厚区域。对燃用烟煤点火情况下燃烧器内部复杂区域的流动、燃烧以及流固耦合传热进行三维数值模拟,比较油枪燃油量对燃烧器点火性能以及壁面温度的影响,对燃油量进行了优化。监测点壁面温度模拟值与实际测量值符合较好。计算结果表明,适当降低燃油量不仅不影响点火性能,还可以降低燃烧器壁面温度。实际运行结果表明,在油量为80 kg/h时燃烧器出口平均温度和最高温度有所下降,各项指标和参数正常,满足成功点火的需要。 相似文献
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P. V. Roslyakov I. V. Morozov M. N. Zaychenko V. T. Sidorkin 《Thermal Engineering》2016,63(4):268-277
Various variants for the structure of low-emission burner facilities, which are meant for char gas burning in an operating TP-101 boiler of the Estonia power plant, are considered. The planned increase in volumes of shale reprocessing and, correspondingly, a rise in char gas volumes cause the necessity in their cocombustion. In this connection, there was a need to develop a burner facility with a given capacity, which yields effective char gas burning with the fulfillment of reliability and environmental requirements. For this purpose, the burner structure base was based on the staging burning of fuel with the gas recirculation. As a result of the preliminary analysis of possible structure variants, three types of early well-operated burner facilities were chosen: vortex burner with the supply of recirculation gases into the secondary air, vortex burner with the baffle supply of recirculation gases between flows of the primary and secondary air, and burner facility with the vortex pilot burner. Optimum structural characteristics and operation parameters were determined using numerical experiments. These experiments using ANSYS CFX bundled software of computational hydrodynamics were carried out with simulation of mixing, ignition, and burning of char gas. Numerical experiments determined the structural and operation parameters, which gave effective char gas burning and corresponded to required environmental standard on nitrogen oxide emission, for every type of the burner facility. The burner facility for char gas burning with the pilot diffusion burner in the central part was developed and made subject to computation results. Preliminary verification nature tests on the ТP-101 boiler showed that the actual content of nitrogen oxides in burner flames of char gas did not exceed a claimed concentration of 150 ppm (200 mg/m3). 相似文献
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宽调节比燃烧技术的研究 总被引:3,自引:2,他引:1
本文从试验和数值模拟两个方面对宽调节比(WR)燃烧器的一次风弯管内气固两相流动,燃烧器钝体后两相流场,以及钝体后混合流场进行了研究,综合分析和燃烧器稳定燃烧机理,并提出了改进措施。研究结果为大型电站燃烧系统的设计及运行提供了重要依据。 相似文献
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The design of a two-channel vortex pulverized-coal startup burner is proposed, in which fuel-air mixture is admitted through the burner’s primary channel. Necessary and sufficient conditions for obtaining stable ignition of pulverized coal during operation of this burner are formulated. A procedure of using the Fluent software system for numerically studying the influence of fuel characteristics and operating parameters on the stability of flame ignition and formation is developed. The results of numerical investigations aimed at determining the effect the flowrate of a mixture of mechanically activated micropowdered coal with air has on the combustion process for a particular design of the startup burner installed in the central part of the main direct-flow round burner used in the PK-40-1 boiler at the Belovo district power station are presented. A conclusion is drawn from these results regarding the extent to which the flowrate of mixture affects the performance of this startup burner. 相似文献
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径向浓淡旋流燃烧器气固流动特性的实验研究及其对燃烧的影响 总被引:8,自引:3,他引:5
在气固两相实验台上采用三维PDA系统对径向浓淡旋流煤粉燃烧器及蜗壳燃烧器出口的气固流动特性进行了试验,发现前者在中心回流区边缘附近形成了较高的颗粒浓度,中心回流区中颗粒浓度也较大,后者在中心回流区及边缘附近颗粒浓度较小,壁面区域则较大,分析了两相流动特性对燃烧器性能的影响,并通过工业试验进行了验证,表明径向浓淡旋流煤粉燃烧器是一种同时具有高效,稳燃,低污染,防止结渣和防止高温腐蚀的新一代旋流燃烧器 相似文献
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对W火焰锅炉的旋流燃烧器和直流燃烧器的特点进行介绍,对实际运行中两类燃烧器存在的优缺点进行了说明,为W锅炉燃烧器选型提供参考. 相似文献
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针对火电厂煤粉锅炉冷态节油点火、低负荷稳燃、煤种适应性提高、低NOx运行等要求,开发了新型外燃式微油点火燃烧器,点火燃油量在100 kg/h左右,该燃烧器同时作为主燃烧器使用,并具有低负荷稳燃与低NOx功能。5台锅炉的工业应用结果表明,外燃式微油点火燃烧器可实现锅炉冷态点火,煤粉燃尽率在82%以上,可实现不投油自然停炉,NOx下降率为25%左右,结合燃尽风后NOx下降率达55%左右。中心风是该燃烧器的主要调节手段,数值计算表明,调节中心风可以改变燃烧器出口回流区长度,从而调节煤粉着火点位置。 相似文献