Answer / r.murugan

important closed loop in boiler side
1.Drum level control (single element control and three
element control)
single element control : only drum level
three element control : steam flow, feedwater flow, drumlevel

2.boilerfeedpump scope control,super heater spray
temparature control,hp heater level control,lp heater level
control,presure reducing control,dearator level control
o2 master control,

turbine side control: speed control (during start up),load
control,intial pressure control,exhaust temp control, load
drop control,oiltemp control,

open loop control based on unit capacity

Answer / ch amir islam

dear infact numbers of loops eitherr thz r open or close
depends on the required system & process.any how these
loops are used on demand of process.as relitively ur
question in which kind of system u want to ask about
COMBINE CYCLE POWER PLANT or OPEN CYCLE POWER PLANTS.open
loops depends on the system reliability if u want to check
morer parameters on ur HMI or at CONTROL DEVICE

send me HPCL paper

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