浅析回转式空气预热器密封系统磨损问题

阐述引起回转式空气预热器密封系统不正常磨损的几种特殊情况,提出减小密封系统磨损的有效措施.     

回转式空气预热器密封形式的改进

分析回转式空气预热器的漏风因素及现行密封形式的优缺点,提出回转式空气预热器“单密封”的“双密封”形式改进的理论依据及可行性研究,通过几个发电厂实际改进效果表明,此项改进是改善回转式空气预热器漏风大的有效方法。     

回转式空气预热器多道密封的技术特性

介绍了空气预热器多道密封的结构及特性以及多道密封与空气预热器漏风的关系,并从设计、工艺、制造及安装等方面入手,分析了最佳密封道数的选择原理。     

回转式热管空气预热器在锅炉中的应用

本文就回转式热管空气预热器在锅炉中的应用,叙述其结构与工作原理及实际运行情况,从经济性方面对该预热器进行了分析。     

回转式空气预热器漏风性能试验的几点分析

本文通过对回转式空气预热器漏风性能试验的分析，论述了漏风性能试验相关的一些重要问题．及由此对电厂经济运行所带来的益处。     

风罩回转式空气预热器的改造

空气预热器是良好的节能设备，用于锅炉和余热回收，可得很高的经济效益。目前电站锅炉中尚存在一部分较早生产的风罩回转式空气预热器，性能较差，漏风较大，效率较低。现有不少实例应用新一预热器去替换这些早期产品，以获得机组的安全运行和良好的经济效益，这是对老机组更新换代改造的重要举措。     

浅谈回转式空气预热器漏风控制系统的作用

通过对回转式空气预热器漏风率的分析,说明了漏风控制系统在降低漏风方面所起到的作用,及由此对电厂经济运行所带来的益处。     

回转式空气预热器接触式柔性密封可靠性设计

接触式柔性密封是针对回转式空气预热器泄漏问题的一种新技术,可靠性是接触式柔性密封性能的重要指标.基于ANSYS的可靠性设计方法,运用ANSYS的PDS模块,将有限元方法和可靠性设计理论相结合,对接触式柔性密封进行三维参数化建模,并编制APDL命令流,建立可靠性分析文件对接触式柔性密封进行了可靠性设计.在置信度为95%的情形下,接触式柔性密封的可靠性为96.91%.结果显示.接触式柔性密封的结构是可靠的,得到了各结构参数的设计范围,波厚和总长是影响接触式柔性密封的主要因素,对接触式柔性密封的设计与研究有一定的参考价值.     

回转式空气预热器的热点探测系统

针对回转式空气预热器的安全隐患，提出了探测第一失火点的装置—热点探测系统。     

提高回转式空气预热器性能途径的研究

回转式空气预热器是大型电站锅炉广泛采用的尾部换热设备,空气预热器的性能对锅炉机组的效率有很大影响。通过对回转式空气预热器在运行过程中常见的问题进行分析,提出了提高空气预热器整体性能的方案,并针对这些问题,总结分析并提出了对策,对提高空气预热器的性能具有指导性的意义。     

工业锅炉空气预热器的声振动及其防治

空气预热器的振动会影响锅炉的正常运行,产生的噪音更对工作人员的健康产生不利影响。结合某厂生产的64 MW热水锅炉出现的空气预热器低温段振动案例,对振动的成因进行了分析,并进行了详细的防振计算,计算结果表明已解决了振动问题。较其它文献有一个显著的特点,就是列出了详细的防振计算方法和各项数据的选取依据,计算符号的标识也趋于一致,可供实际计算时参考。     

Exergy analysis on the irreversibility of rotary air preheater in thermal power plant

Energy recovery devices can have a substantial impact on process efficiency and their relevance to the problem of conservation of energy resources is generally recognized to be beyond dispute. One type of such a device, which is commonly used in thermal power plants and air conditioning systems, is the rotary air preheater. A major disadvantage of the rotary air preheater is that there is an unavoidable leakage due to carry over and pressure difference. There are gas streams involved in the heat transfer and mixing processes. There are also irreversibilities, or exergy destruction, due to mixing, pressure losses and temperature gradients. Therefore, the purpose of this research paper is based from the second law of thermodynamics, which is to build up the relationship between the efficiency of the thermal power plant and the total process of irreversibility in the rotary air preheater using exergy analysis. For this, the effects of the variation of the principal design parameters on the rotary air preheater efficiency, the exergy efficiency, and the efficiency of the thermal power plant are examined by changing a number of parameters of rotary air preheater. Furthermore, some conclusions are reached and recommendations are made so as to give insight on designing some optimal parameters.     

配SCR的锅炉空气预热器适应性改造实践

宝钢电厂1、2号350 MW机组锅炉因环保需要增设的烟气脱硝装置(简称SCR)所产生的硫酸氢氨,将引发空气预热器的腐蚀和堵灰现象,从而严重影响锅炉机组的安全运行,因此必须对空气预热器进行适应性改造。对空气预热器适应脱硝改造的设计原则和技术注意事项进行了研究。改造后锅炉排烟温度下降了5~8℃,平均漏风率降低了1%~2%。烟气流动阻力基本维持在800 Pa以下,且未出现明显的积灰堵塞情况。该项目改造取得了预期目标,为行业提供了成功的案例经验。     

回转式三分仓空气预热器堵灰分析及预防

介绍天津大唐国际盘山发电有限责任公司600MW机组锅炉空气预热器低温腐蚀堵灰情况,以及空预器低温腐蚀的机理,针对该公司空预器堵灰的主要原因,给出了预防和处理措施,保证了机组安全、稳定、经济运行。     

空预器排烟温度高的原因及解决措施

某电厂3#机组在试运行期间存在空预器排烟温度高于设计值的问题,影响了锅炉的安全经济运行。针对这一问题,进行深入分析,找出影响因素,并提出一系列解决措施,从一定程度上解决了排烟温度偏高的问题。     

600MW机组锅炉回转式空预器电流波动分析

通过对回转式空预器电流波动的机理进行分析,结合电厂生产实际和事故处理案例,对回转式空预器运行中可能出现的电流波动现象做一剖析,提出了各种电流波动的原因和处理方法,对电厂同类型回转式空预器电流波动的事故处理有一定的借鉴意义。     

Analysis and application of variable conductance heat pipe air preheater

The heat transfer analysis of variable conductance heat pipe air preheater was carried out. The temperature trans-fer matrix was obtained for the air preheater that comprises several discrete heat transfer units with same or different heat transfer surface area in a parallel or counter flow mode. By using the temperature transfer matrix, the outlet fluid temperatures could be easily calculated for a given air preheater and inlet fluid temperatures. The active length of condenser in a variable conductance heat pipe is determined according to the flat interface model. With the same initial conditions, the comparisons between variable conductance heat-pipe air preheater and regular heat pipe air preheater has been analyzed and tested in terms of heat pipe wall temperature, heat transfer surface area and outlet fluid temperatures. Based on the real industrial applications, it has been confirmed that the variable conductance heat pipe air preheater has excellent performance of anti-corrosion and anti-ash-deposition especially at the variable working condition and the sulfur coal (5%-6% mass fraction of sulfur) condition.     

改双管定风量系统为变风量系统的方法

在双管定风量系统中 ,不改变它的末端装置 ,而是在供热干管上安装热风阀 ,就能将双管定风量系统转变成变风量系统     

Three‐dimensional modeling method for heat exchange of rotary air preheater in coal‐fired power plant

A numerical modeling method based on a 3‐D heat transfer model and duct models for a dual‐sectional rotary air preheater have been developed in this paper. Owing to different boundary conditions for the heat transfer model obtained by modeling and calculation of the ducts, this method is capable of calculating the 3‐D metal and fluid temperature fields at different radial locations in the rotary air preheater along the rotor height as well as the rotating period, and furthermore, it can calculate temperature and flow field inside the flow passage as well. A case study with a dual‐sectional rotary air preheater of a typical 300 MW_e unit used as the research object is presented in this paper. The calculation results accord well with those obtained by verified numerical methods in published literature. The difference between the calculated and the measured outlet fluid temperature of the rotary air preheater is smaller than 3 °C. The numerical modeling method presented in this paper is proved to have high precision and is beneficial for the secure and economic operation of a rotary air preheater as well as the whole unit. © 2010 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/htj.20325