NDLI: Improvements in the Performance of a Subcooling Zone in a Feedwater Heater With Dual End Plate Design With Water Seal in Between

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Nadig, Ranga
Copyright Year	2015
Abstract	In a horizontal feedwater heater with a partial length subcooling zone the end plate located at the entrance to the subcooling zone is the only non-welded barrier that prevents the condensing zone steam from entering the subcooling zone. The end plate is usually two or three inches thick and the tube holes in the end plate are drilled to tolerances similar to that of the tubesheet. As the steam from condensing zone tries to enter the subcooling zone it condenses in the tight spaces between the active tube and the tube hole in the end plate forming a liquid barrier that prevents further ingress of steam into the subcooling zone. With usage and wear the gap between the active tube and the tube hole in the end plate increases thereby weakening the liquid barrier. The liquid barrier is completely lost when the tubes are plugged. Steam from condensing zone enters the subcooling zone and disrupts the performance of the subcooling zone, the performance of the feedwater heater and the efficiency of the power plant. This problem is faced by all horizontal feedwater heaters with subcooling zones that are in operation in power plants worldwide. This loss of performance can be eliminated by employing the patent pending Maarky concept of “dual end plate subcooling zone with a water seal”. The “dual end plate subcooling zone with water seal” concept comprises of two end plates separated by a short distance. The gap between the two end plates is filled with condensate thereby forming a triple barrier to ingress of condensing zone steam into the subcooling zone. The performance of the subcooling zone and the longevity of the heater are preserved. This paper discusses the design of subcooling zone in present day feedwater heaters, degradation of performance of subcooling zone and the improvements brought about by the patent pending Maarky concept of “dual end plate subcooling zone with water seal”.
Sponsorship	Power Division
File Format	PDF
ISBN	9780791856604
DOI	10.1115/POWER2015-49418
Volume Number	ASME 2015 Power Conference
Conference Proceedings	ASME 2015 Power Conference collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum
Language	English
Publisher Date	2015-06-28
Publisher Place	San Diego, California, USA
Access Restriction	Subscribed
Subject Keyword	Design Water Space Patents Subcooling Condensed matter Wear Steam Feedwater Plates (structures) Power stations
Content Type	Text
Resource Type	Article

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