内螺纹管近临界压力区两相流沸腾传热特性的研究

INVESTIGATION ON BOILING HEAT TRANSFER OF INTERN ALLY RIBBED TUBES IN NEAR CRITICAL PRESSURE REGION

锅炉水冷壁管采用内螺纹管结构是锅炉中防止传热恶化的主要措施之一．目前国内外有关内螺纹管在近临界压力区汽水两相流沸腾传热特性方面的研究资料还甚少．为了加速我国300MW直流锅炉的完善化，并考虑炉膛水冷壁将在近临界压力条件下工作，

This paper discribes the experimental results on the boiling heat transfer characteristics of internally ribbed tubes in near critical pressure region. The experimental parameters range as follows: pressure p = 19.6-22.6MPa, mass velocity G -650-1750kg/m2 s, heat flux of the inside wall qi = 200-610kw/m2, The outside wall temperature profile in the abovementioned parameter ranges is obtained, the effect of eliminating boiling heat transfer deterioration by using internally ribbed tubes is determined, and the heat transfer characteristics of three types of internally ribbed tubes of similar geometry are compared and evaluated.