锅炉定期排污系统是为了排除锅炉水循环系统中的沉积物,亦是放水装置。一般均布置在循环系统的最低点。如:锅筒或下锅筒的底部;水冷壁下联箱的底部等。定期排污系统工作条件甚差:排污时,要将具有工作压力的饱和水及污垢排出,通常背压很低,使排污阀承受很大的压降(图1);同时,系统金属温度将升高到接近到饱和水的 Regular boiler sewage system is to exclude the boiler water circulation system of sediment, but also the drainage device. Generally arranged in the lowest point of the circulatory system. Such as: the drum or the bottom of the drum under the water tank under the bottom of the box and so on. Periodic sewer system is very poor working conditions: sewage, the working pressure of saturated water and dirt to be discharged, usually low back pressure, sewage valve to withstand a great pressure drop (Figure 1); the same time, the system metal temperature will rise High close to saturated water