Performance Study and Analysis of a 300 MW High Backpressure Heat Supply Unit Condenser after Retrofit

This paper introduces the retrofit of the condenser of a 300 MW high backpressure heating turbine. According to the test data of high and low backpressure situation, we calculated the operation indexes of the condenser at these situation. The condenser terminal temperature difference is both small at high and low backpressure situations, the average condenser terminal temperature difference is 2.09 degrees C and 2.74 degrees C when it's at high and low backpressure situation, which are both are smaller than the design value. After the retrofit, under the normal backpressure condition, the condenser operation pressure is 4.647 kPa at 319 MW load, the condenser pressure is 4.955 kPa after the circulating water flow rate and inlet temperature correction, and the maximum correction terminal temperature difference is 2.15 degrees C, which is slightly higher than the design value. The condenser performance is improved obviously after the high backpressure retrofit. After the retrofit, the condenser pressure at 320 MW conditions is 0.475 kPa lower than 300 MW. Around the load condition of 270 MW, the condenser pressure is 0.416 kPa lower than that before the retrofit.