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furnace pressure control

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Title: furnace pressure control


1
Furnace pressure control
  • Cfbc boiler
  • Ashvani Shukla
  • MANAGER(CI)
  • BGR ENERGY

2
2 00 3
P 1 avg
FURNACE PRESSURE TWO OUT OF THREE LOGIC
3
PV
FIC/PID
SV
A/M
O/P
VFD
VVVFD
POWER CYLINDER/IGV
4
LOOP CONTROL AND DISCRIPTION
  • Furnace Pressure Control 
  • The objective of furnace pressure control is to
    keep the furnace pressure stable during
    operation. This is managed through controlled
    inlet vane /Damper. 
  • Typically there are three furnace pressure
    measurements in use, and the average of those
    signals is used as process value of the furnace
    pressure controller. The furnace pressure
    controller is a proportional/integral type with a
    variable proportional gain. 
  • The controllers output, that is based on the
    proportional/integral action of the controller
    through auto manual station (to be realized PLC)
    will control Inlet Vanes of both ID fans.(Inlet
    vanes control will be operational when Fan
    running at constant speed) 

5
Continue..
  • As per control loop we starts explain how we
    control the furnace draft of boiler.
  • Furnace draft is controlled through Induced draft
    fan and Inlet guided vane or VVVFD.
  • Initially we measure the furnace draft pressure
    from three pressure transmitters(PT-1 ,2,3). We
    have 2 00 3(two out of three) selection block by
    which we can select two healthy(transmitter which
    have less deviation) transmitters and generate
    the process value for PID controller.
  • We give the set point of furnace draft to PID
    controller. PID compare the set value and the
    process value and generate the error to drive the
    final control element(Dampers/VVVFD) of Induced
    draft fan.
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