IN 3 element drum level control of boiler, we take 3 signals 1) BFW Flow 2) Drum level 3) Steam Flow
My question is why we use flow signal of BFW instead of using pressure signal ?
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Posted 08 January 2015 - 11:57 PM
IN 3 element drum level control of boiler, we take 3 signals 1) BFW Flow 2) Drum level 3) Steam Flow
My question is why we use flow signal of BFW instead of using pressure signal ?
Posted 09 January 2015 - 12:44 AM
These three elements are only for drum level control. Drums are small, so response must be fast. Pressure is generally controlled through a boiler master control that adjusts firing. You might want to Google industrial boiler control.
Bobby
Posted 12 January 2015 - 02:24 AM
Bobby
Thank you for your reply. I am well aware of steam header pressure control. My question was when we can use pressure signal in 3- element level, than why we prefer flow signal.
As pressure and flow will both respond in case of disturbance
Regards
ABS
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