共查询到20条相似文献,搜索用时 203 毫秒
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对徐州电厂SG50410-M型锅炉存在的水冷壁、过热器爆管问题进行了分析、研究。认为炉内火焰冲刷水冷壁及对流过热器烟温分布不均是造成爆管的主要原因。提出了改造四角燃烧器布置和三次风喷口的方案。测试结果表明:该试验取得的效果较为满意,可有效地防止SG50410-M型锅炉水冷壁、过热器爆管。 相似文献
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新型煤粉燃烧器的燃烧机理分析 总被引:1,自引:0,他引:1
分析了国内超临界和超超临界锅炉采用的几种新型煤粉燃烧器的燃烧机理。主要特点是采用多级配风技术灵活控制燃烧器出口的煤粉火焰燃烧过程;实现着火初期低氧燃烧和火焰内NOx还原技术;在旋流式燃烧器内采用煤粉浓缩技术和环形齿状稳燃器或直流过渡风,在喷口附近煤粉气流着火初期,加强热烟气回流和维持高温及低氧燃烧,促进挥发分析出过程中的NOx还原,并实现快速着火和低负荷稳定燃烧;在A-PM型直流式燃烧器上采用带扩压管的缩放型小喷口结构,增强稳燃能力和维持高温和低氧燃烧,促进NOx还原,并均衡火焰温度,降低水冷壁的热负荷;设置可调节燃尽风进一步提高炉内脱氮效果和提高燃烧效率等。 相似文献
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针对某电站锅炉水冷壁严重高温腐蚀,发生爆管事故问题,采用宏观检查、金相及沉积物能谱分析等方法,找出导致水冷壁大面积高温腐蚀的影响因素,提出了改进和预防措施。应用结果结果表明:燃烧器改造及锅炉燃烧调整,使水冷壁爆管事故得到有效控制,确保了锅炉安全稳定运行。 相似文献
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针对1台电站锅炉水冷壁频繁爆管事故进行了宏观特性、化学成分、力学性能、组织特征、内壁垢层成分、炉水品质分析,认为是氢腐蚀导致水冷壁爆管事故;阐述了氢腐蚀的特点和对电站锅炉的危害;提出减少氢腐蚀的预防措施有:调整锅炉燃烧器的火焰喷射角度、稳定工况、保持锅炉运行中排污系统正常运行等。 相似文献
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由于水冷壁管与刚性梁的连接结构以及混合器处水冷壁进出口弯头间的连接和密封结构不合理,燃烧器、二次风喷口的安装缺陷等造成广州瑞明电厂2号炉Nox排放超标,针对这一问题进行低Nox燃烧器及燃烧系统配风改造,改造后经热态试验及运行调整,取得了良好的效果,Nox排放质量浓度控制在400 mg/m3以下,达到国家标准要求. 相似文献
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水冷壁是锅炉的蒸发受热面,吸收炉膛高温火焰的辐射热,把水加热并逐步变成饱和蒸汽和水的混合物。其工作条件相当差,由于热辐射、低负荷、结渣、结垢等原因会使水冷壁的传热能力降低。8月28日发生了水冷壁爆管,结合本次锅炉大修,按照监督规程的要求运行10万小时的机组做扩大范围的普查工作,发现水冷壁多处有鼓包,对不同标高处割管取样,发现有鼓包的管材力学性能分析抗拉强度已到下限,金相组织有长期过热倾向,材质老化,更换材质不合格的管材。 相似文献
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1 设备概况邯郸热电厂#10锅炉为单汽包、Π型布置、固态排渣、自然循环煤粉炉,露天布置。燃烧煤种为贫煤,热风送粉。该炉于1990-08-18投产。原设计直流燃烧器分2层布置,每层4只,共8只,炉内为四角切圆燃烧。2级省煤器和2级管式空气预热器交错布置。制粉系统为中间储仓式,配有2台钢球磨煤机,并装有送、引风机各2台。2 存在的问题原燃烧器为直流燃烧器,1994-05小修时,将下排改为多功能燃烧器,装有船形钝体,并将油枪改在下一次风口内。1996-03以后,锅炉开始频繁发生水冷壁爆管事故,检修时发现水冷壁因高温腐蚀而严重减薄,且水冷壁及燃烧器结焦… 相似文献
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《电气》2011,(2):14-18
With the incessant development of power market reform,the existing cross-subsidy in electricity tariffs has become a critical problem in China’s power industry development.On the basis of the theories of cross-subsidy and electricity universal service,the authors take foreign countries’ experience as reference to design several solutions to cross-subsidies in electricity tariffs in different phases of China’s power industry development.Furthermore,the application and implementation of these solutions are analyzed in this paper. 相似文献
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The author suggests that the confidence which many biologists have in problem-solving methods is unwarranted and that there are very important limitations in almost all current methods for solving biological problems. The standard problem solving approach that computer scientists use is outlined. An example of an error in an evolutionary tree problem-the case of the African Eve-is discussed 相似文献
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Recent progress in inverse problems in electrocardiology 总被引:5,自引:0,他引:5
The considerable progress achieved in the inverse problem of electrocardiography over the last decade has provided grounds for optimism about the possibility of approaching significant clinically relevant applications in the next decade. However, there are a number of basic questions that still remain. In addressing these questions, the authors feel it is important to seek solutions that emphasize physiological rather than mathematical significance. This approach leads to twin requirements for useful inverse solutions: accuracy, defined in a physiologically meaningful (and not just averaged and mathematical) sense, and reliability, not only to measurement noise but also to geometric modeling errors and other uncertainties that are inescapable in practical application. Studies using analytically tractable models may still be relevant, but it seems more important to find solutions to practical inverse problems, which will move the field toward wider acceptance and credibility 相似文献
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无色透明材料形成的单层薄膜,其颜色由干涉色决定。以白光照射其表面,随薄膜厚度的增加,将出现一系列色彩,这是由薄膜干涉所致。我们可以根据薄膜颜色,估计薄膜厚度。显然,当厚度增大到后界面的影响可以忽略不计的程度(相当于只有一个界面的半无限大情形,本文简称“厚膜”),则“厚膜”颜色恢复为无色透明。半透明材料在基底上形成的薄膜系统,以白光照射所呈现的颜色,由于基底及吸收的影响,则不能简单地以薄膜干涉来分析。对于半透明薄膜系统,首先测量它的光强反射率谱和透射率谱,运用传递矩阵[1]方法计算出薄膜的介质光学常数,再以光学常数计算单层薄膜与“厚膜”的光强透射率谱与反射率谱及它们的色坐标。以菲涅耳公式计算出的反射率谱为半无限大介质反射率谱,这时的色坐标可视为“厚膜”的色坐标。 相似文献
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A survey is provided of Japanese research on ceramic materials for substrates, microwave dielectric ceramics, piezoelectric ceramics, semiconducting ceramics, and superconducting ceramics. Novel processing technologies are described, covering the use of amorphous materials, superfine powders, lamination, multilayer thin films, porous ceramics, and superlattices 相似文献
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