why need 3 element system in power plant?
if it is not there then what l happen?
Answer Posted / ajeet pal singh
As steam flow and feed water flow effects the level of
boiler drum these two are taken as two elements in three
element control system to achieve smooth control on drum
level ideally these two are capable to maintain the drum
level but the third element as drum level actual itself is
taken to compensate various leakages etc. As we know the
controller doesn't respond unless it senses some error
between PV and SV and if drum level actual is taken alone to
control the drum level, controller will respond only if
level goes up or down to its set point and this will
maintain always a pulsating drum level instead of a straight
line. Steam flow and feed water flow consideration gives a
feed forward effect to controller hence a smooth control on
drum level can be achieved
Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
Which are all the commonly used Bordon tubes in the pressure gauges. Do any one use ASTM A 312 tubes for this purpose?
where proximity sensor installed on tank in loading arm application
Calibration procedure for Electro magnetic Flow meter
State some of balance principle’ advantages?
Draw a complete P&ID of a flow suction tank indicating all control & protection equipment. Indicate all its inlets and outlets. Explain the controls for this system
Which products are available in the Mass Systemswitch and System Manager AC range?
How process line mpm calculation is done?
this site is owned by an nonsense
describe flow nozzel principle?
What are advantages and disadvantage of the ac supply load cell?
give eg of how I/P is used in control loops
Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72
How to Calibrate Ultrasonic Level Transmitter in field
Using your own examples solve a problem involving normal table. (experimental method and analysis)
how to calculate control valve bonnet size?? or how to select its material?