ForumReasons behind oxygen injection in feedwater circuit for supercritical boiler?
From: B.Sarkar [1089]
Date: Friday, July 30, 2010
Time: 2:38:27 AM
Remote Name: 59.93.201.198
Comments
In super critical boiler, oxygen in controlled amount is injected in condensate and feed water after deaerator.Though dissolved oxygen has limits in the feed water circuit to discharge in to supercritical boiler to avoid
oxydation, resistance to heat transfer surface and tube damage. My question is why extra effort is paid to
discharge external oxygen in power cycle water even after condensate polisher output if oxygen is harmful
to boiler feed water circuit. Note that there is an oxygen injection control loop which includes PID controller
and a flow control valve in oxygen supply path.
Please explain with a logical approach.
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