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根据中间分隔轴封漏汽的数值计算法推导出漏汽率的误差分析公式。利用变汽温法与数值计算法,对600MW超临界汽轮机的中间分隔轴封漏汽率进行了详细计算。结果表明,相对于变汽温法,数值计算法同样能够准确地估算漏汽率的大小;并分析了温度、压力等测量参数误差对该漏汽计算的影响,计算显示,再热蒸汽温度和中压缸排汽温度是影响中间分隔轴封漏汽率精度的主要因素。同时计算了该机组高压缸排汽平衡盘漏汽量及其对中间分隔轴封漏汽计算的影响,分析证明,接往中压缸排汽区的高压缸排汽平衡盘漏汽对中间分隔轴封漏汽计算的影响较大。在考虑以上2股漏汽后,准确地计算了中压缸效率,计算结果表明,在相同漏量的情况下,中间分隔轴封漏汽对中压缸效率的影响大于高压缸排汽平衡盘漏汽。
The error analysis formula of the leakage rate is deduced according to the numerical calculation method of the leakage of the middle seal. The steam leakage rate of the middle separated shaft seal of 600MW supercritical steam turbine is calculated in detail by using the method of variable temperature and numerical calculation. The results show that, compared with the variable temperature method, the numerical method can also accurately estimate the size of the leakage rate. The influence of measurement parameters such as temperature and pressure on the leakage calculation is analyzed. The results show that the temperature of the reheat steam and The temperature of the exhaust pipe of the intermediate pressure cylinder is the main factor that affects the accuracy of the leakage rate of the middle separated shaft seal. At the same time, the leakage volume of the balance disc of the high-pressure cylinder of the high-pressure cylinder and its influence on the leakage calculation of the middle separated shaft seal were calculated. The analysis proves that the leakage of the high-pressure cylinder exhaust balance plate to the middle cylinder exhaust area is separated from the middle partition Shaft leakage steam calculation has a greater impact. After taking into account the above two steam leakage, accurate calculation of the pressure cylinder efficiency, the calculation results show that in the case of the same amount of leakage, the middle of the shaft seal leak steam on the efficiency of the cylinder is greater than the high-pressure cylinder exhaust balancing disc Leak steam.