Experimental Study and Analysis of Condenser Performance under Dual Backpressure Operation Mode

Abstract

backpressure operation, cooling water heat supply. Abstract. The condenser modification of a 150MW unit for high backpressure cooling water heat supply is introduced in this paper. Economy characteristics of the transformed condenser are calculated using the high and low backpressure operation data. The condenser terminal difference is 2.354oC under high backpressure condition, which is lower than the design value (4oC). The condenser terminal differences under three low backpressure conditions are 6.535oC, 5.358oC and 5.148oC respectively, and the corrected values of it by inlet water flow and temperature are 8.721oC,7.179oC and 6.724oC, all of which are higher than the design value (4oC) and those before modification. The total condenser heat-transfer coefficient is 2.183kW/(m 2 .oC), lower than the mean value before modification which is 3.388 kW/(m 2 .oC). It is shown that with the condenser modification, the unit safety can be guaranteed during normal operation, yet the economy parameters are poorer than design values, being lower than those before modification. In 125MW load condition, the condenser back pressure after modification is 0.9kPa higher than that before modification.