高温熔盐冲蚀实验系统设计与试验研究

In this paper carried out erosion characteristics research of heat exchangers tubes wall under high temperature molten salt, a large molten salt erosion experimental platform was setup. Mixed nitrate salts, the most widely used medium in solar thermal, was selected as the working medium. Through the method of rotating bolt, erosion dynamic preliminary experimental research was conducted on the two common stainless steel pipe 304 and 321 at 350 C. The erosion dynamics plot was drawn with the weight loss data. Results show that the curve trend of erosion behavior is consistent with each other for stainless steel 304 and 321. Erosion rate expressed in the quality or the thickness is in the good interests of linear relationship with flow velocity. The parabolic variation relationship between erosion wastage per unit area and time is alike for two kinds of material. Under the same velocity of molten salt, the erosion resistance performance of 321 is better than that of 304, and the erosion rate of stainless steel 304 can reach 1.632 times than that of 321 in heavy conditions, which may be linked to the titanium joined in the latter.