12-04-2014, 04:26 PM
Magneto hydro Dynamic(MHD) Generator
Magneto hydro.ppt (Size: 1.11 MB / Downloads: 50)
Fraday’s law
When a charged partcile moving in a magnetic field, it expreience the retarding foce as well as produce voltage. This is the basis of Faraday’s law.
Principle, construction and working of Magneto hydrodynamic generator (MHD)
Principle
The principle of Magnetohydrodynamic generator is based on Lorenz law and faraday's law.
In this system, the hot ionized gaseous conductor (working fluid) is passed into the high magnetic field and thereby the current is produced. By placing suitable electrodes (Anode and cathode) inside the chamber, the output load is taken through the external circuit.
Construction:
MHD generator consist of a Combustion chamber and generator chamber.
The fluid conductor is passed into the combustion chamber where they are ionized at very high temperature.
There is a nozzle through which the ionized gas pass into the generator chamber.
The generator chamber consist of powerful magnet and a number of oppositely located electrode pair is inserted in the channel to conduct the electrical current generated to an external load.
Both combustion chamber and generator chamber are surrounded by a heat resistance material and water cooler
Working
The gaseous (fluid) conductor is passed into the combustion chamber through inlet.
By using a fuel like oil (or) natural gas (or) coal, the fluid conductor is heated to a plasma state and hence it is ionized.
The temperature in the combustion chamber is around 2000°C to 2400°C.
The heat generated in the combustion chamber removes the outermost electrons in the fluid conductor.
Therefore, the gas particle acquires the charge.
The charged gas particles with high velocity enters into the generator chamber via nozzle.