In this article we will discuss about the design of electro gas dynamic generator with the help of a schematic diagram. Also learn about the advantages of electro gas dynamic generator over MHD systems.
‘Carona electrode’ at the entrance of the duct generates electrons. This ionised gas particles are carried down the duct with the neutral atoms and the ionized particles are neutralised by the ‘collector electrode’, at the end of the insulated duct. The working fluid in these systems are commonly, either combustion gases produced by burning of fuel at high pressures, or it is a pressurised reactor gas coolant.
The maximum power output from EGD is about 10 to 30 W per channel. Hence, several thousand channels are connected in series and parallel. The voltage produced is very high, of the order of 1,00,000 to 2,00,000 V. Thus, it needs very good high voltage insulators (Beryllmm Oxide is generally used).
The EGD generator uses the potential energy of a high pressure gas to carry electrons from a low potential electrode to a high potential electrode, thereby doing work against an electric field. EGD can produce a high efficiency equal to MHD-steam combination.
Advantages of EGD over MHD Systems:
1. EGD systems operate at relatively low temperatures.
2. No need for injection and recovery of seed material.
3. This system is self-contained since it does not need a steam generator.
4. Energy can be extracted till the gases reach almost the stack temperature.
5. It does not need large quantities of condenser cooling water.
EGD and MHD hold the prospects of offering the best solutions for high efficiency, large capacity systems for the production of electricity.