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Tom749

Analysis of P&ID

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I want to know the concept of the attached P&ID drawing. Please explain the concept of the P&ID drawing inside of the red box.(Boiler Control) Thanks for your help in advance. Edited by Tom749

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Tom, Your question is not really easily answered in a chat topic in a forum. Might I suggest you locate a purchase a book called "The Control of Boilers", 2nd Edition or later, by Sam G. Dukelow. You will find this on Amazon or ISA websites. Also consider purchasing a reference book for understanding and reading of SAMA logic diagrams.

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HI, I'll take a stab at explaining the controls in the red box in a general way. 2 variable out puts from that controller, fuel and air. 2 inputs, O2 from the stack sensor, and looks like some mysterious "Fuel Demand" is the other This seems strange compared to what I'm used to. I am used to seeing boiler pressure as a controlling input to the fuel and air flow. Also I usually see a mechanical air damper controlling the air flow, not a motor speed controller. Anyhow, the whole concept of the red box is to control flow of fuel & air for combustion in the boiler, while maintaining the desired ratio. One variable flow control valve on the fuel line & one variable speed air fan. Of course the devil is in the details. That is my $0.02 BD

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