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-> 行业资讯－ 翅片管一定程度上影响了余热锅炉的性能与成本
发布时间：(2018/9/28)
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翅片管一定程度上影响了余热锅炉的性能与成本 |
锅炉的热力计算是锅炉性能设计的重要内容。热力计算的准确性即受热面的数量是保证余热锅炉出力、参数、热效率及成本的根本。不同型式的螺旋翅片管：如螺旋翅片、H形或碟形翅片等?虽然已在常规电站锅炉、循环流化床锅炉和冶金、化工、建材等行业的余热锅炉中也有着广阔的应用。但是，在其设计过程中?主要采用国外引进或前苏联的标准计算方法，并借助设计人员的长期设计经验或对于一定结构的翅片管束的模化试验结果。目前，国内尚无成熟、规范的各种翅片管束标准计算方法。
Thermodynamic calculation of boilers is an important part of boiler performance design. The accuracy of thermodynamic calculation, i.e. the quantity of heating surface, is the basis of ensuring the output, parameters, thermal efficiency and cost of waste heat boiler. Different types of spiral finned tubes, such as spiral fins, H-shaped or dish-shaped fins, have been widely used in conventional power plant boilers, circulating fluidized bed boilers and waste heat boilers in metallurgical, chemical and building materials industries. However, in the design process, the standard calculation method imported from abroad or the former Soviet Union is mainly adopted, and the long-term design experience of designers or the simulation test results of finned tube bundles with certain structures are used. At present, there are no mature and standardized calculation methods for finned tube bundles in China.
对于联合循环余热锅炉螺旋翅片管的传热计算也是如此。 在国外引进或前苏联的标准计算方法中，虽有关于螺旋翅片管束的传热及阻力计算方法，但具体应用上有局限性。一方面是结构参数上，如管束间距、翅片规格等。另一方面是未能充分反映燃气轮机排气的污染特性对传热计算的影响。
The same is true for heat transfer calculation of spiral fin tubes in combined cycle waste heat boiler. In the standard calculation method introduced abroad or in the former Soviet Union, although there is a method for calculating the heat transfer and resistance of spiral finned tube bundles, its application is limited. On the one hand, the structural parameters, such as tube spacing, fins specification, etc. On the other hand, it can not fully reflect the influence of gas turbine exhaust pollution characteristics on heat transfer calculation.
此外，螺旋翅片管的传热特性尚与翅片的焊接方法及焊着率有关，而国内外的翅片管焊接工艺不可避免地存在着一定的差异。上述因素限制了锅炉制造厂在联合循环余热锅炉及其它余热锅炉的翅片管受热面设计中对于翅片管和受热面结构与布置的进一步优化以及翅片管束的国产化，翅片管一定程度上影响了余热锅炉的性能与成本。
In addition, the heat transfer characteristics of spiral finned tube are still related to the welding method and welding rate of finned tube, and the welding process of finned tube at home and abroad is inevitably different. These factors limit the further optimization of finned tube and heating surface structure and layout in the design of finned tube heating surface of combined cycle waste heat boiler and other waste heat boiler and the localization of finned tube bundles. Finned tube affects the performance and cost of waste heat boiler to a certain extent.
此外，当燃气轮机排气通过螺旋翅片管向管内蒸汽传热时，尽管螺旋翅片管强化了受热面的传热能力，但也使管外翅片工作在恶劣的高温环境中，使得管外螺旋翅片的温度往往较高，可能超过材料所允许的耐温极限，造成翅片被烧坏。对余热锅炉而言，其高压过热器与再热器受热面因管外烟气和管内工质温度均较高?如设计时翅片高度不合理，则螺旋翅片最外端的温度，通常称为翅端温度，可能超过翅片材料的允许温度，从而导致翅片因超温烧毁，影响余热锅炉的运行可靠性。 综上所述，必须对不同结构的翅片管及翅片管受热面的传热与阻力特性、螺旋翅片的温度分布等进行研究，为翅片管的结构优化以及翅片管受热面的优化设计提供设计计算方法。
In addition, when gas turbine exhaust gas passes through the spiral finned tube to heat the steam in the tube, although the spiral finned tube enhances the heat transfer capability of the heating surface, it also makes the fin outside the tube work in harsh high temperature environment, which makes the temperature of the spiral fin outside the tube often higher, possibly exceeding the allowable temperature limit of the material, resulting in the fin. It was burnt out. For waste heat boilers, the high pressure superheater and reheater heating surfaces have higher flue gas outside the tube and the working medium inside the tube. If the fin height is unreasonable, the temperature of the outer end of the spiral fin, usually called the fin temperature, may exceed the allowable temperature of the fin material, which may cause the fin to burn down and affect the waste heat. Boiler operation reliability. To sum up, it is necessary to study the heat transfer and resistance characteristics of finned tubes and finned tubes with different structures, and the temperature distribution of spiral fins.辛苦整理.转载请注明http://www.wxsxsjx.com
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