BOILER DRUM MODELLING, LEVEL CONTROL SYSTEM AND SIMULATOR DESIGN AT PLTU JERANJANG UNIT III
Level control on boiler drum is an important part of coal power plant’s control system. Level condition has to be controlled so it doesn’t pass off the operation limit. Power plant’s process will be stopped if level pass off the operation’s range value. Level is difficult to be contrrolled manual...
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| Format: | Final Project |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/44853 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Level control on boiler drum is an important part of coal power plant’s control
system. Level condition has to be controlled so it doesn’t pass off the operation
limit. Power plant’s process will be stopped if level pass off the operation’s range
value. Level is difficult to be contrrolled manually because there are shrink and
swell phenomena that occur inside drum boiler. Shrink and swell phenomena
caused by non minimum phase characteristic of the boiler.
This research is focus on designing the model of boiler drum operation and
designing PID control for drum level control system of Jeranjang Unit III coal
power plant. Model of boiler drum is designed by breaking down global mass and
global energy balance equation. Final form of the model is state-space equation
with state variables: pressure (P), water volume under water surface (Vwt), steam
volume in the drum (Vsd), and steam quality ( ). Variables that manipulated are
steam mass flowrate (qs) and feedwater mass flowrate (qf). Controlled variables
are water level ( ) and pressure (P). Heat rate (Q) is inputted as disturbance.
The validated model is simulated by 1 element control and 2 element control
method. 1 Element Control can stabilize system from 10% step change of Q and
keep the value of feedwater mass flowrate in operation range value (31-33.33
kg/s). But when the value of steam mass flowrate (qs) is decreased, 1 Element
Control cannot keep the level stability in operation range value (-50 mm – 50
mm). Level instability from steam mass flowrate change is caused by increment of
drum pressure value. Drum pressure’s increment causes condensation of the vapor
in downcomer so water level shrink. 2 Element Control is needed for controlling
the level from steam’s mass flowrate change. On 2 Element Control, pressure and
level are controlled at spesific value by changing the value of feedwater and steam
massflow rate. |
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