共查询到19条相似文献,搜索用时 183 毫秒
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针对150t/h煤粉动力锅炉存在的高温腐蚀、结焦、热效率低及无油助燃低负荷稳燃能力差等问题,利用膜法富氧技术,首次开发了局部富氧助燃技术,设计了膜法富氧局部助燃系统,进行了局部增氧助燃技术应用于煤粉锅炉的工业试验。实践证明,大渣及飞灰可燃物含量降低,锅炉热效率提高了2.5%以上;降低了NOx排放浓度,在120~150t/h负荷下为627~768mg/m3;提高了低负荷不投油稳燃能力,可以在50%额定负荷下断油稳燃;有效解决了炉膛结渣和高温腐蚀等问题,为煤粉锅炉的安全、经济、环保运行开辟了一个新方向。 相似文献
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水平浓谈风煤粉燃烧器低负荷稳燃性能的试验研究 总被引:1,自引:0,他引:1
通过水平浓淡风煤粉燃烧器气固混合特性的试验研究及在320MW双炉膛锅炉上的应用表明:该燃烧器具有较强的低负荷稳燃能力,同时具有燃烧效率高,防结渣及防水冷壁高温腐蚀性能。在减少电厂低负荷稳燃用油方面经济效益显著。图8参4 相似文献
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大容量直流燃烧器与旋流燃烧器锅炉的燃烧技术分析与性能对比 总被引:5,自引:0,他引:5
结合燃烧技术的分析,对直流燃烧器与旋流燃烧器锅炉的燃烧效率、低负荷稳燃及NOx排放性能等进行了比较。对2类锅炉中的热偏差与超温、结渣与高温腐蚀问题进行了新的探讨。 相似文献
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W型火焰锅炉燃烧问题的分析和解决方法 总被引:5,自引:0,他引:5
W型火焰锅炉是我国大型电站锅炉燃用低挥发份燃料的主要燃烧方式之一。目前,我国运行的W型火焰电站锅炉中普遍存在着炉膛温度控制过高、炉膛结渣或结渣倾向严重、NOx排放过高、过热器超温或汽温偏差、燃用无烟煤燃烧效率不高和某些情况下燃烧不稳定等问题。该文在总结这些问题的基础上,深入分析了问题的根源。分析表明:出现上述问题的根本原因是缺乏一种着火稳燃性能好的适用于燃烧无烟煤、半无烟煤的低NOx燃烧器。对这些问题的解决方法进行了探讨,并以清华大学开发的富集型燃烧器为例,讨论了用优良稳燃型直流燃烧器改善W型火焰锅炉燃烧情况的可行性。图3表2参16 相似文献
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Md Tanvir ALAM Baiqian DAI Xiaojiang WU Andrew HOADLEY Lian ZHANG 《Frontiers in Energy》2021,15(1):46
Gasification or combustion of coal and biomass is the most important form of power generation today. However, the use of coal/biomass at high temperatures has an inherent problem related to the ash generated. The formation of ash leads to a problematic phenomenon called slagging. Slagging is the accumulation of molten ash on the walls of the furnace, gasifier, or boiler and is detrimental as it reduces the heat transfer rate, and the combustion/gasification rate of unburnt carbon, causes mechanical failure, high-temperature corrosion and on occasions, superheater explosions. To improve the gasifier/combustor facility, it is very important to understand the key ash properties, slag characteristics, viscosity and critical viscosity temperature. This paper reviews the content, compositions, and melting characteristics of ashes in differently ranked coal and biomass, and discusses the formation mechanism, characteristics, and structure of slag. In particular, this paper focuses on low-rank coal and biomass that have been receiving increased attention recently. Besides, it reviews the available methodologies and formulae for slag viscosity measurement/prediction and summarizes the current limitations and potential applications. Moreover, it discusses the slagging behavior of different ranks of coal and biomass by examining the applicability of the current viscosity measurement methods to these fuels, and the viscosity prediction models and factors that affect the slag viscosity. This review shows that the existing viscosity models and slagging indices can only satisfactorily predict the viscosity and slagging propensity of high-rank coals but cannot predict the slagging propensity and slag viscosity of low-rank coal, and especially biomass ashes, even if they are limited to a particular composition only. Thus, there is a critical need for the development of an index, or a model or even a measurement method, which can predict/measure the slagging propensity and slag viscosity correctly for all low-rank coal and biomass ashes. 相似文献
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大型电站锅炉采用切向燃烧方式燃用无烟煤的研究 总被引:2,自引:0,他引:2
无烟煤的特点是挥发分低,发热量高,着火温度高。在燃烧过程中存在的主要问题是着火困难、燃烧效率低、炉膛易结渣、NOx排放高。作为我国特定地区的一种动力用煤,燃用无烟煤的电站锅炉在设计时重点考虑着火、稳燃、提高燃烧效率、防止炉膛结渣、降低NOx排放。介绍了无烟煤的主要燃烧方式和大型锅炉采用四角切向燃烧技术燃用无烟煤的设计原则。此外,还介绍了上海锅炉厂有限公司设计的300MW自然循环、切向燃烧无烟煤锅炉的特点和运行结果,并对燃用无烟煤燃烧技术在600MW无烟煤锅炉上的应用前景做了预测。 相似文献
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In this paper, a new technology for a tangential firing pulverized coal boiler, high efficiency and low NOx combustion technology with multiple air-staged and a large-angle counter flow fuel-rich jet (ACCT for short) is proposed. To verify the characteristics of this technology, experiments of two combustion technologies, ACCT and CFS-1 (Concentric Firing System-1), are carried out under a cold model of a 1025 t/h tangential firing boiler with a PDA (particle dynamics anemometer). The distributions of velocity, particle concentration, particle diameters and the particle volume flux of primary air and secondary air are obtained. The results show that the fuel-rich primary air of ACCT can go deeper into the furnace and mix with the main flow better, which means that the counter flow of fuel-rich jets in ACCT can realize stable combustion, low NOx emission and slagging prevention. 相似文献
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大力发展生活垃圾及农林废弃物等生物质直接燃烧发电和煤炭掺烧生物质燃烧发电对缓解我国能源安全问题和实现“双碳”战略目标具有重要意义。然而生活垃圾和农林废弃物中较高含量的碱/碱土金属、硫、氯和硅等元素在高温燃烧过程中会发生复杂交互反应,导致锅炉结焦、积灰和腐蚀等一系列问题,严重影响锅炉的安全稳定运行。通过系统分析生活垃圾和农林废弃物等固体燃料燃烧过程中可能的结焦、积灰和腐蚀形成机理,探讨了原料灰分组成和结焦、积灰、腐蚀形成的关联关系和预测方法,在此基础上比较了不同类型结焦、积灰和腐蚀抑制剂的作用机制及其施加效果,并对未来高效抑制剂的开发进行了展望。 相似文献