Could anybody pls give ans of boiler 3 element control system?
- 5 Answers
- 11983 Views
- Qatar Petroleums, I also Faced
- E-Mail Answers
Answer Posted / ecxlsync
in boiler drum level control it uses the three elements
principle wherein it consist of Feed water Flow, actual drum
level and steam flow.
in the feed water line there are two Flow Control Valves (37%and 100%). the 37% is being controlled by single element
(single controller). the SP of single controller is the
actual pressure compensated drum level. if the steam flow
is more than 30% of its designed max flow, drum level
control will shift automatically to three elements control
which is in cascaded mode (two controllers). the output of
primary controller which is compensated by the steam flow
as feed forward control is being fed to the secondary
controller as setpoint for the feed water flow. the output
of secondary controller is sent to 100% FCV to manipulate
the feed water flow.
therefore, 3 elements control is to attain that feed water
flow will be equal to the Steam flow.
| Is This Answer Correct ? | 6 Yes | 1 No |
Post New Answer View All Answers
Please send me the sample question of Instrumentation of hpcl/iocl exam. my mail id hihi_kiholo@rediffmail.com
pls suggest suitable MOC of diaphragm for pressure measurement of UREA grade solution service fluid.
What is heating effect?
if my flow is 20000 m3/h than which range of DPT i have to use????
Describe how to use megger to measure the earth resistance and insulation resistance
HOW TO CALCULATE ACCURACY OF AN INSTRUMENT. WHICH IS COMPITABLE FOR USE.
Calibration procedure for electro magnetic flow meter
what is the procedure to callibrate temp controller ,pressure controller,etc. suppose a temp controller showing error 1.5 degree centigrate how can i minimize it.
Difference between ultra sonic flow meter
How to decrease opening & closing time of on/off valve?
Im having problems with interfase betwen SPI v7.0 and SPPID v5.05. Previous versions of Intools shoul be fixed with SPPIDproj.ocx file. It was necessary to replace this file with one that allows the connection between different versions of SPPID. It is necessary in the current version to do the same?Thanks
what is effect of specific gravity in differential level transmitter , explain formula related with this .
How many are the types of instrument cables in terms of No. of pair.
what is thermo coupler and how it works
hye SAM acn u send your e mail id, so that i can solve my query through e mail?
