I want to know that in an exist steam power plant, what aspects (such as heat exchanging aria, level of condensate or etc) of the steam feed water heaters can improve?
The modifications can improve efficiency or decrease the flow rate of steam to the condenser.
Mr. Ahmadi, you have missed few terms in your question. These are termed as Regenerative Feed Water Heaters. Bled steam from turbine extraction points are taken to heat feed water before it enters boiler (economizer), this process improves thermal modified Rankine cycle efficiency by 8%. How efficiency improves? should now be answered by you.
You will need to increase the temperature of the feed water that enters the heater. This objective can be achieved by:
1) Harvesting industrial waste heat from other sources within the plant such as hot flue gases before discharge through the plant stack.
2) Using solar energy to heat up the feed water before entering the heater (where water is converted into steam).
The main idea here is to increase the sensible heat of water that enters the heater and this will improved the efficiency of the steam power plant.
Feed water heaters can be improved by providing extended heat transfer area such as finned surface.
Minimizing heat transfer losses.
when you heat the feed water with flue gas , if u use the thermo electric materials you can also generate electricity
By increasing the feed water temperature, the feed water heater increases the overall efficiency of the steam power plant. Feed water heater increases the feed water temperature near to the boiling point. So, the interning water of the boiler can easily transfer into steam and improve the efficiency of the plant.
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