针对IVR-ERVC策略的朝下曲面化学水沸腾CHF特性试验

Experimental Study on Critical Heat Flux of Chemical Water Boiling on a Downward Facing Curved Surface for IVR-ERVC Strategy

基于大型临界热流密度（CHF）试验台架,以压力容器用SA508III钢作为加热表面材料,以添加有硼酸（H3BO5）与磷酸三钠（Na3PO4）的化学水溶液为冷却介质,试验研究真实压力容器表面材料朝下曲面化学水沸腾的CHF特性。试验结果表明：对于SA508III钢材料压力容器,在不同属性的化学水环境中CHF呈现不同变化规律。硼酸溶液CHF值较去离子水低,且随浓度（1000-3000 mg/L）增加而降低;低浓度（500、1000 mg/L）磷酸三钠溶液CHF值获得强化,而高浓度下（3500 mg/L）CHF弱化;硼酸与磷酸三钠混合溶液的CHF随磷酸三钠浓度增加先增大后减小。

Based on a large scale test facility which adopting the SA508Ⅲ steel as heating surface material and utilizing the chemical solution with addition of boric acid （BA：HaBOs） or/and trisodium phosphate （TSP： NaaPO4） as coolant, the CHF characteristics of chemical solution boiling on a downward facing curved real reactor pressure vessel material surface were investigated experimentally. Experimental results indicate that the CHF values show different changes in different chemical solution environment for the SAS08III steel material. The CHF of BA decreases with the concentration of 1000 to 3000 mg/L and is lower than that of deionized water. The CHF of TSP with lower concentration of 500 and 1000mg/L is enhanced, while weakened for a high concentration of 3500 mg/L. The CHF of mixed solution of BA and TSP increases firstly and then decreases with the increasing of TSP concentration.