Oxygen content value in feed-water of NO.3 and NO.4 boiler for Shenhua Hebei Cangdong Power Generation Co.

Ltd.fluctuated sharply when the unit load changed

during the manual oxygenation process.Withal

the adjustment of oxygen addition lagged behind the unit load change.Thus

technical transformation of automatic control on oxygenation with feed water flow signal as the feedforward was conducted.Meanwhile

a pressure stabilizer device

for which the outlet pressure of constant pressure valve is the actual pressure at oxygen addition position for condensate water

was added at oxygen adding point on exit main pipe in condensate polishing system

so the control quality of feed water oxygenation was further improved.The unit operation indicates that

after the automatic control of feed water oxygenation

the dissolved oxygen content in feed water can timely follow up the unit load variation

and lagging of the oxygenation regulation has been eliminated.