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This paper introduces the retrofit of the condenser of a 300MW 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°C and 2.74°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 4.647kPa at 319MW load, the condenser pressure is 4.955kPa after the circulating water flow rate and inlet temperature correction, and the maximum correction terminal temperature difference is 2.15°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 320MW conditions is 0.475kPa lower than 300MW. Around the load condition of 270MW, the condenser pressure is 0.416kPa lower than that before the retrofit. Keywords-steam turbine, high backpressure retrofit, condenser retrofit, circulating water heating, performance research

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