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SouthEast University (2020)

Study on Bionic Anti-erosion Technology of Boiler Heat Tube Base on the Desert Scorpions

杨锟

Titre : Study on Bionic Anti-erosion Technology of Boiler Heat Tube Base on the Desert Scorpions

Auteur : 杨锟

Grade : Master 2020

Université : SouthEast University

Résumé partiel
The explosion accidents of boiler heat tube seriously threaten the safety of the unit.Although the traditional anti-erosion methods have certain effects,they all have obvious disadvantages.Based on the surface characteristics of desert scorpions,the bionic structure was extracted.Furthermore,the numerical simulation method was used to study the anti-erosion characteristics,anti-erosion mechanism and optimal size combination of the bionic structure.Finally,the bionic structure was applied to the tubes,the anti-erosion effect and relevant erosion characteristics were researched through experimental methods,which provide a new idea for the anti-erosion of boiler heat tube.The main research content includes:Firstly,in order to study the anti-erosion characteristics of bionic surface,groove surface,bump surface and groove-bump surface was extracted based on the desert scorpions.The erosion rate distribution was studied by numerical simulation methods.The results show that when the impact angle is less than 70°,all bionic surfaces are effective in anti-erosion.The groove structure has a significant effect,the groove-bump surface has the best friction reduction effect at 45°,and the erosion rate is reduced by 65.3%.The bump structure has a limited effect on the flow field,but it changes the impact angle a lot.While a large-scale vortex structure is formed in the groove structure,which has a greater impact on the flow field and impact speed.The peak value of the erosion rate changed from 30° to 45°,this is because the impact angle of both is about 35°,which is the maximum theoretical wear rate,but the impact speed of 45° is 1.4 times that of 30°.Secondly,based on the previous numerical calculation model,the anti-erosion effect of bionic surfaces among different size combinations were studied.For the groove-bump surface,the erosion rate decreases as the groove width and bump diameter increase.These two parameters have an independent effect on the erosion rate,and the influence of the groove width is greater.As for the groove surface,the erosion rate decreases with the increase of the groove width/groove depth,then tends to be gentle,and finally increases.The optimal groove width/groove depth is between 2.5~3,which perform best in anti-erosion

Mots clés : Boiler Heat Tube ;Bionic Structure ;Erosion Wear ;Anti-Erosion Technology ;Size Combination ;

Présentation (CNKI)

Page publiée le 5 avril 2022