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-> 行業(yè)資訊－ 翅片管一定程度上影響了余熱鍋爐的性能與成本
發(fā)布時間：(2018/9/28)
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翅片管一定程度上影響了余熱鍋爐的性能與成本 |
鍋爐的熱力計算是鍋爐性能設(shè)計的重要內(nèi)容。熱力計算的準(zhǔn)確性即受熱面的數(shù)量是保證余熱鍋爐出力、參數(shù)、熱效率及成本的根本。不同型式的螺旋翅片管：如螺旋翅片、H形或碟形翅片等?雖然已在常規(guī)電站鍋爐、循環(huán)流化床鍋爐和冶金、化工、建材等行業(yè)的余熱鍋爐中也有著廣闊的應(yīng)用。但是，在其設(shè)計過程中?主要采用國外引進(jìn)或前蘇聯(lián)的標(biāo)準(zhǔn)計算方法，并借助設(shè)計人員的長期設(shè)計經(jīng)驗或?qū)τ谝欢ńY(jié)構(gòu)的翅片管束的�；囼灲Y(jié)果。目前，國內(nèi)尚無成熟、規(guī)范的各種翅片管束標(biāo)準(zhǔn)計算方法。
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.
對于聯(lián)合循環(huán)余熱鍋爐螺旋翅片管的傳熱計算也是如此。 在國外引進(jìn)或前蘇聯(lián)的標(biāo)準(zhǔn)計算方法中，雖有關(guān)于螺旋翅片管束的傳熱及阻力計算方法，但具體應(yīng)用上有局限性。一方面是結(jié)構(gòu)參數(shù)上，如管束間距、翅片規(guī)格等。另一方面是未能充分反映燃?xì)廨啓C排氣的污染特性對傳熱計算的影響。
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，螺旋翅片管的傳熱特性尚與翅片的焊接方法及焊著率有關(guān)，而國內(nèi)外的翅片管焊接工藝不可避免地存在著一定的差異。上述因素限制了鍋爐制造廠在聯(lián)合循環(huán)余熱鍋爐及其它余熱鍋爐的翅片管受熱面設(shè)計中對于翅片管和受熱面結(jié)構(gòu)與布置的進(jìn)一步優(yōu)化以及翅片管束的國產(chǎn)化，翅片管一定程度上影響了余熱鍋爐的性能與成本。
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，當(dāng)燃?xì)廨啓C排氣通過螺旋翅片管向管內(nèi)蒸汽傳熱時，盡管螺旋翅片管強化了受熱面的傳熱能力，但也使管外翅片工作在惡劣的高溫環(huán)境中，使得管外螺旋翅片的溫度往往較高，可能超過材料所允許的耐溫極限，造成翅片被燒壞。對余熱鍋爐而言，其高壓過熱器與再熱器受熱面因管外煙氣和管內(nèi)工質(zhì)溫度均較高?如設(shè)計時翅片高度不合理，則螺旋翅片最外端的溫度，通常稱為翅端溫度，可能超過翅片材料的允許溫度，從而導(dǎo)致翅片因超溫?zé)龤�，影響余熱鍋爐的運行可靠性。 綜上所述，必須對不同結(jié)構(gòu)的翅片管及翅片管受熱面的傳熱與阻力特性、螺旋翅片的溫度分布等進(jìn)行研究，為翅片管的結(jié)構(gòu)優(yōu)化以及翅片管受熱面的優(yōu)化設(shè)計提供設(shè)計計算方法。
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.轉(zhuǎn)載請注明http://www.wxsxsjx.com
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