引风机叶片耐磨喷焊

1 叶轮叶片工况分析石河子热电厂,五台煤粉锅炉Y4-73-11№18D型引风机的任务,是将锅炉炉膛中燃烧生成的烟气抽出,烟尘中的SiO_2,Fe_2O_3,MgO,Al_2O_3等非金属和金属氧化物,随着高速气流撞击在叶片表面,产生了磨损,由δ=     

热电厂烟气脱硫技术初探

火电厂排放的SO2严重地危害着人类的生存环境,为此,国家重新修订了《火电厂大气污染物排放标准》,强制要求对火电厂排放的烟气,要安装烟气脱硫装置来进行控制。笔者以氧化铝厂配套建设的热电厂锅炉烟气治理为例,分析、比较了几种治理措施的特点,提出了适合的烟气脱硫方法。     

浅谈炭素余热锅炉结焦、积灰的处理方法

煅烧余热锅炉的热源是回转窑而温煅烧石油焦后产生的高温度烟气,这些高温烟气中含有大量的灰分、硫分,高温烟气流经锅炉受热面后,形成结渣、结焦、松灰、腐蚀等.本文主要对结焦、积灰形成的原因,以及对锅炉运行的影响进行了分析,并提出了具体的处理方法.     

铜冶炼闪速熔炼炉余热锅炉设计简介

余热锅炉是现代制铜系统中关键设备之一,锅炉的先进性和可靠性直接影响到系统的技术水平和经济效益.余热锅炉用来回收熔炼炉排出的高温烟气余热,降低烟气温度,为后部收尘和制酸创造条件,与此同时回收烟气的余热产生压力为4.2MPa的饱和蒸汽送至汽轮机发电,也可减压后并入厂区热力管网供用户使用.下面谈谈对一台闪速熔炼炉余热锅炉的设计体会.     

火力发电厂承压小径管现场X射线检测参数的优化

某热电厂1“锅炉过热器改造项目中,现场条件的制约使X射线检测焦距变化不定,检测参数难以选择,针对这一情况,将传统曝光曲线进行改进,制定了新的曝光曲线,并进行了一系列的实验。     

锅炉水冷壁管失效原因分析

对锅炉水冷壁外壁横向裂纹的产生原因进行了宏观观察、金相组织分析、扫描电镜和能谱分析等。结果表明,锅炉水冷壁管裂纹的形成是由于壁温波动下的轴向交变应力和烟气中腐蚀介质共同作用产生的腐蚀性热疲劳开裂,针对问题的产生提出了具体的防范措施。     

520t/h锅炉准东煤掺烧的研究

新疆准东地区煤炭资源丰富,但因其碱金属含量高,煤灰极易沾污,不适用电站锅炉大量使用,本文主要是针对新疆众和150 MW机组配套520 t/h锅炉燃烧准东煤做了研究探讨,在提高掺烧比例的同时,提出了防止锅炉受热面积灰结焦的预防措施,为其他锅炉燃用准东煤提供了参考数据。     

掺废渣混凝土抗冻融性能的超声检测

用超声波法检测了掺废渣混凝土在水溶液、3．5％氯化钠溶液以及3．5％氯化钠与5．0％硫酸钠复合溶液中冻融前后的声速变化。结果表明，生态混凝土在氯化钠溶液中冻融循环的质量损失比水和复合溶液中冻融循环的质量损失大，氯化钠溶液对生态混凝土冻融循环产生的剥蚀是不能忽略的；声速变化比质量损失变化明显，说明超声波法是一种检测混凝土冻融损伤的简单可靠的方法。     

循环流化床锅炉在小型热电厂设计应用中的几点认识

本文对小型热电厂所用的循环流化床锅炉的设计应用进行了论述，并着重谈了在设计ＣＦＢ锅炉房过程中反映出的一些问题。     

电站锅炉水冷壁管的焊接修复

0 前言 水冷壁是电站锅炉最主要的蒸发受热面,它布置在锅炉炉膛的四周,主要是吸收炉膛火焰的辐射热使水冷壁内的水受热产生蒸气,其次是保护锅炉炉墙.由于长期受高温辐射及高速的烟气冲刷作用及其他因素,有时发生爆管现象,需进行焊接修复.     

水冷壁管受热面失效分析

通过电子探讨,能谱和Ｘ射衍射等多种分析技术系统分析某电厂锅炉水冷壁管发生局部腐蚀的原因。结果表明,腐蚀产物中硫含量很高,局部区域超过２０（ｗｔ％）,产物主要由铁的氧化物和硫化物组成。水冷壁管受热面腐蚀主要原因是高温硫腐蚀。     

Potential high temperature corrosion problems due to co‐firing of biomass and fossil fuels

Over the past few years, considerable high temperature corrosion problems have been encountered when firing biomass in power plants due to the high content of potassium chloride in the deposits. Therefore, to combat chloride corrosion problems co‐firing of biomass with a fossil fuel has been undertaken. This results in potassium chloride being converted to potassium sulphate in the combustion chamber and it is sulphate rich deposits that are deposited on the vulnerable metallic surfaces such as high temperature superheaters. Although this removes the problem of chloride corrosion, other corrosion mechanisms appear such as sulphidation and hot corrosion due to sulphate deposits. At Studstrup power plant Unit 4, based on trials with exposure times of 3000 h using 0–20% straw co‐firing with coal, the plant now runs with a fuel mix of 10% straw + coal. Based on results from a 3 years exposure in this environment, the internal sulphidation is much more significant than that revealed in the demonstration project. Avedøre 2 main boiler is fuelled with wood pellets + heavy fuel oil + gas. Some reaction products resulting from the presence of vanadium compounds in the heavy oil were detected, i.e. iron vanadates. However, the most significant corrosion attack was sulphidation attack at the grain boundaries of 18‐8 steel after 3 years exposure. The corrosion mechanisms and corrosion rates are compared with biomass firing and coal firing. Potential corrosion problems due to co‐firing biomass and fossil fuels are discussed.     

Influence of novel cycle concepts on the high‐temperature corrosion of power plants

The aim to reduce CO₂ emissions has triggered the evaluation of new cycle concepts for power plants. CO₂‐capture concepts are also evaluated to add on new and existing power plants. For combined cycle power plants (CCPP), different cycles are investigated such as integrated gasification (IGCC) or oxy‐fuel firing. Besides the difference in combustion compared to a conventional CCPP, the environmental boundary conditions are changed and will affect the oxidation and corrosion life of the materials in the hot‐gas path of the gas turbine and the heat‐recovery steam generator. For the circulating fluidised bed power plants, the biomass co‐firing and the oxy‐fuel firing are also foreseen for CO₂‐emission reduction. The fireside corrosion of the water walls will be influenced by these concepts and the changed fuel. The corrosion risk has been evaluated for two new power plant concepts: combined cycle with exhaust gas recirculation and pulverised coal‐fired boiler with oxy‐fuel firing. Based on this evaluation, the consequences for the testing conditions and the material selection have been discussed in detail.     

陶瓷钢铁复合管在锅炉中的应用

针对热电厂煤粉锅炉弯管存在的磨损问题，采用陶瓷钢铁复合管替换碳钢管。介绍了陶瓷钢铁复合管的制造工艺和性能及应用情况。     

电站锅炉不锈钢管氧化皮检测技术

电站锅炉不锈钢管内壁由于蒸汽氧化容易产生氧化皮,剥落的氧化皮会堵塞管道,严重时甚至造成堵塞爆管。为了降低事故,减少损失,开展对电站锅炉不锈钢管氧化皮的检测就极为重要。基于磁性检测技术,提出了不锈钢管氧化皮检测方法,研制了检测仪器,并在现场进行了大量应用。实践表明,该仪器具有携带方便、检测快捷和灵敏度高等优点,可较好地满足电站锅炉不锈钢管氧化皮检测的要求。     

陶瓷钢铁复合管在锅炉中的应用

针对热电厂煤粉锅炉弯管存在的磨损问题,采用陶瓷钢铁复合管替换碳钢管,耐磨性提高,寿命延长30倍.介绍了陶瓷钢铁复合管的制造工艺和性能及应用情况.     

Review on high temperature corrosion of PCF boilers in Poland

The paper presents selected data on power industry in Poland. The information given comprises electric energy production, number of power plants, steam and fuel (coal) characteristics as well as chemical compositions of construction materials being currently in use for furnace wall and superheater tubing. Briefly discussed are also the results of investigations on fireside corrosion of pcf boilers. It has been found that the high temperature corrosion phenomena observed on furnace wall tubes in the vicinity of burners are related with local reducing conditions and chlorine content in coal whereas those encountered on superheater tubes are associated with fused ash deposits. Preventive measures to combat fireside corrosion and slagging planned for the nearest future are the application of bimetallic coextruded tubes and the dosage of additives in coal combustion.     

火电锅炉和电站管（板）用钢的现状与展望

介绍了火电锅炉、电站汽水系统的主要受压部件用钢、锅筒用钢、锅炉内汽水管道用钢、锅炉外及电站汽水管道用钢的现状与发展。     

1025t/h锅炉水冷壁爆管分析

某新建电厂一台1025t／h锅炉进行水压试验时发生前包墙水冷壁管爆破，本文采用了化学成分分析、常温力学性能试验、金相组织观察及断口电子分析等方法，分析了水冷壁管的爆管原因。结果表明：管子强度过高、韧性太差、变径管内表面存在微小裂纹。是爆破产生的主要原因。     

烟气脱硫净化装置的设计应用

烟气脱硫净化装置是一种湿法复合式消烟脱硫去氮的净化器。可直接配套使用在燃煤锅炉或相应的燃烧炉上 ;如铸造用烘干炉　回火炉 ,冶金用锻造炉和垃圾焚烧炉。它是一种环保设备。本文主要介绍该装置工作原理 ,技术结构特点、安装和使用。