论文部分内容阅读
一、前言石景山发电总厂京西电厂第一台20万千瓦机组配用二台上海水泵厂的DG500-180型给水泵。该泵原为国产12.5万千瓦机组的配套设备,不仅效率低,安全性也较差。因此想通过改进来提高它的流量和效率,以便在不投高加时,单泵可带20万千瓦,投高加时可带18万千瓦以上,而出口压力不低于180公斤/厘米~2。这样,机组在高负荷范围内调峰运行时就可以少开一台泵。原DG500-180型给水泵的铭牌效率为71％,但实际运行效率只有64～67％(见《DG500-180型给水泵鉴定意见书》),与高效给水泵相比约低10％左右,因此耗电量大。改进后,要求泵的效率能达到75～77％,这样,既能满足增大流量的要求又可保证原电动机不过
I. Foreword Shijingshan Power Plant Plant The first 200,000-kilowatt unit of Jingxi Power Plant is equipped with DG500-180 type water-supply pump from Shanghai Pump Factory. The pump was originally a domestic 125,000 kilowatts unit supporting equipment, not only inefficient, safety is also poor. So want to improve to improve its flow and efficiency, so that when not in high, a single pump can bring 200,000 kilowatts, when put into high plus 180,000 kilowatts or more, and the outlet pressure of not less than 180 kg / cm ~ 2. In this way, the unit in the high load range peaking operation can be less open a pump. The original pump efficiency of DG500-180 type water pump is 71%, but the actual operating efficiency is only 64-67% (see the “DG500-180 type feed pump identification opinion”), about 10% lower than the high efficiency feed pump, Therefore, power consumption. After the improvement, the pump efficiency is required to reach 75 ~ 77%, so that both to meet the requirements of increased flow and ensure the original motor, however