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采用近似方法从理论上导出了一种立式 U型管自然循环蒸汽发生器换热面积的近似理论计算公式，并将其计算结果与实际的立式 U型管自然循环蒸汽发生器换热面积进行了比较，其绝对误差在 8％以下。“,”A kind of approximate theoretical calculating formula of the vertical U-bend tube natural-circuit steam generator is deduced by using an approximate method,the results of this formula is compared with the heat exchanging areas of the real vertical U-bend tube natural-circuit steam generators,the absolute errors of them are below 8％ .