Tuesday, July 20, 2010

Generation and controls: Summary

Generating of Power: A super short summary:
Ohk...here is an overview of how things work in a power plant. I shall not go into details here...just the energy transformation chain and a few controls. Just a basic idea.

Energy in a Thermal Power Plant:
Ignition and the consequent combustion of coal generates heat. this means that exothermic chemical reactions take place at the initial stage. the heat produced increases the average kinetic energy of the fluids (appropriately chosen for the purpose) that act as a carrier of the thermal energy produced by the exothermic chemical reactions. now, applying Bernoulli's equation we can see that the pressure head and the velocity head of the system must be such that they ensure movement of the turbine blades and they should be controlled in order to have 3000 rpm for a 2 pole system (as in SGS).

there are several control points...the coal feeder determines and controls the amount of coal to be sent to the mill where pulverisation takes place. Governors (nozzle and throttle type) control steam entry into the turbine. the strength and flux intensity of the electromagnet is controlled by controlling the excitation voltage. these control points are logically programmed in such a manner that malfunctioning at any point will lead to a sequential disruption of processes in the system till the malfunctioning part is made error free.

The effluents are effectively managed to ensure Zero Discharge. for details read up ESP and Bottom Ash removal systems along with details of effluent treatment plants. watching the controls valves open and close is an experience....the sight n the sound...super cool! you would never know the feel if you don't witness it.

The Control Units and Panels are extremely attractive! trust me...if you are an instrumentation engineer you are sure to fall in love with them! A co-trainee(a girl) had referred to the bottom ash disposal control panel as "cute"...so i guess u get the idea!!!! :P

for further information join a Plant as a Trainee!!

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