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对中国改进型百万千瓦级压水堆(CPR1000)蒸汽发生器(SG)排污结构进行优化。通过取消排污管及阻挡块,改为在管板上直接开排污孔,提高管廊区域的可达性,便于管板二次侧上表面的检查和泥渣冲洗。应用SG热工水力分析专用软件GENEPI,对比分析优化前后的热工水力特性。结果表明:与原设计方案相比,优化后SG热工水力性能满足设计要求,虽然管板二次侧上表面流场分布发生变化,导致发生泥渣沉积的传热管数量增加,但结构优化后有利于泥渣冲洗,提高冲洗效果。分析结果从理论上证明了优化的可行性。
China’s improved million-kilowatt pressurized water reactor (CPR1000) steam generator (SG) to optimize the structure of the sewage. Through the elimination of the sewage pipes and stop blocks, instead of directly open the sewage pipe holes in the board to improve the accessibility of the pipe gallery area to facilitate the inspection of the secondary side of the tube board and sludge flushing. The application of GENEPI, a special software for thermal and hydraulic analysis of SG, compares and analyzes the thermal and hydraulic characteristics before and after optimization. The results show that compared with the original design scheme, the optimized thermal and hydraulic properties of SG satisfy the design requirements. Although the distribution of the flow field on the secondary side of the tube plate changes, the number of heat transfer tubes with sludge deposition increases, but the structure optimization After the sludge is conducive to flushing and improve the flushing effect. The result of the analysis proves the feasibility of the optimization theoretically.