Boiler Feedwater

Part 2: Dissolved Oxygen Control in Steam Condensate

By Robert D. Bartholomew, P.E., and Gary H. Roberts, P.E.


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In Part 1, we reviewed techniques for monitoring air inleakage in power plants. Approaches include direct testing, increased turbine backpressure, and condensate pump discharge. The article also examined Air Removal Rate Monitoring, including the use of meters to measure the flow of non-condensable gases removed from the condenser, limits, calibration checks of air removal rate monitors, and vacuum pump monitoring. The first article also examined Turbine Backpressure. This can be affected by increased air inleakage, higher heat duty on the condenser, heater drain or dump lines, steam traps, steam line drains, or increased cooling water temperature. Other topics in Part 1 included: l Discharge cation conductivity l Discharge dissolved oxygen (DO) l Water steam leaks Reducing Air Leaks It is advised to combine finding air leaks with fixing air leaks. Sealing air leaks can be fairly difficult and the only way to ensure that the repair is performed effectively is if the air test crew is on site and can retest the area after repairs. Also, as repairs are made, the total air inleakage decreases and the air test crew should retest areas already checked, as smaller leaks may have been masked by some of the larger leaks.

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