2 replies to this topic

[abubakarce19]

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 ? 

[Bobby Strain]

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

[abubakarce19]

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