TOWARDS BETTER UNDERSTANDING OF TEMPERATURE GRADIENTS IN SUPERHEATER CORROSION

摘要：

　　This paper presents a novel laboratory method for superheater corrosion experiments in which a temperature gradient is applied over the deposit and steel.Experiments using salt mixtures of NaCl/Na2SO4 or KCl/K2SO4 show alkali chloride transport (NaCl, KCl) within the salt layer, and to the steel surface.The alkali chloride is vaporized from the salt grains, transported down the temperature gradient, and deposited on surfaces with lower temperature.Mathematical model predictions show the governing transport process to be temperature gradient induced concentration diffusion, not thermal diffusion.The transport rate is species-dependent, with a greater transport rate of KCl as compared to NaCl.Further work is needed for a better understanding of the implications of temperature gradients for superheater corrosion in boiler environments.

作者: Markus Engblom Daniel Lindberg Patrik Yrjas Jonne Niemi Tor Laurén Mikko Hupa

作者单位: (A)bo Akademi University,Biskopsgatan 8 20500,Finland

会议类型: 国际会议

会议名称: The 11th International Conference on Fluidized Bed Technology(CFB-11)(第十一届流化床技术国际会议)

会议地点: 北京

会议语种:英文

页码: 251-256

在线出版日期: 2014-05-14（万方平台首次上网日期，不代表论文的发表时间）