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一、核电站汽轮机的主要特点核电站汽轮机(主要是用于压水堆和沸水堆的)绝大部分采用中等压力参数40—70公斤/厘米~3,基本上是饱和状态的(略带湿度或过热度很小)蒸汽作为工质。和火力发电厂大容量汽轮机相比,它的参数是很低的。现将机组的两个主要特点分述如下。第一个特点是流量大。首先,由于初参数低,汽轮机通流部分的理想含降大大减小,因此,在同等功率下所需的蒸汽质量流量几乎为火电厂高参数汽轮机的两倍。其次,由于压力低,汽轮机进口的蒸汽比容增大,因此主蒸汽的容积流量为火电厂汽轮机的三至五倍。流量大必然会使汽轮机的高压部分和低压部分的尺寸都很大。但由于低压缸每一个排汽口的流量主要取决于末级叶片的长度,对于转速为3000转/分(或称全速)的
First, the main features of nuclear power plant steam turbine Nuclear power plant steam turbine (mainly for PWR and BWR) use most of the medium pressure parameters 40-70 kg / cm ~ 3, is basically saturated (slightly wet or too Heat is very small) steam as working fluid. Its parameters are very low when compared to large capacity steam turbines in thermal power plants. Now the two main features of the unit are described below. The first feature is traffic. First of all, because of the low initial parameters, the ideal drop of steam turbine flow is greatly reduced. Therefore, the required mass flow of steam at the same power is almost twice that of the high-parameter steam turbine. Second, due to the low pressure, the vapor content of the steam turbine inlet increases, so the main steam volume flow is three to five times that of thermal power plant steam turbines. Large flow will inevitably make the high-pressure steam turbine parts and low-pressure part of the size are large. However, the flow of each exhaust port of the low-pressure cylinder mainly depends on the length of the last-stage vane. For the speed of 3000 rev / min