On the modification of spray line in pressure reducing and desuperheating station at thermal power stations

In thermal power stations, the temperature at pressure reducing and desuperheating station (PRDS) header is sometimes unable to contain within a specific limit. This causes instability in PRDS that leads to unsatisfactory performance of the auxiliary systems, resulting in shut down. The cause of the problem is identified, analysed and remedial measures are suggested that spray water for desuperheating the main steam supplied to PRDS can be tapped from the condensate extraction pump discharge line instead of from the boiler feed pump discharge line being practiced. Analyses show that a sum of Rs 20 744 can be saved per day in addition to a substantial saving in the layout cost.