Thermal Engineering

Into turbine goes high pressure dry steam

out of turbine come low pressure wet steam

more economical to convert liquid water to high P dry steam than to convert low P wet steam onto high P dry steam.

It is a waste that power plant designers would like to eliminate, but economics of equipment does not allow.

I am very pleasure in receiving answer from you sir. But you pointed that the pumps are designed for fluid pressures. I am planning in use of a pre-heater instead of compressor to remove wet fraction of steam

But it will still be lower pressure steam after the pre-heater.

How do yoiu re-pressurize stem for inlet turbine conditions?

Or is the LP steam being used for a different process? Co-generation?

Pritam, GA back at you for expanding on my very brief simple explanation.

what about combination of pre heater and compressor

As noted by pritam, the compresser will need more power to compress a mass flow of steam than a pump for a same mass flow of water.

The preheater for steam for a mass flow of vapor is larger and more expensive than a boiler for a similar mass flow of water.

Dear Mr. Santosh1431993.

Mr. Reid and Mr. Pritam has clearly explained, in simple way, with out any Equations. To Compress the exhaust steam of large quantity, you cannot adopt mechanical compressor.

You may say, we can use THERMO-COMPRESSOR. Thermo-Compressor is OK for process usage and normally, you may require 1 Kg. of High Pressure steam for COMPRESSING 3 Kgs of Vapour, where the pressure of compressed vapour will be slightly high, with more HEAT CONTENT in wet condition OR possibly DRY SATURATED CONDITION, where as you need HIGH-PRESSURE for Turbine, with HIGH SUPER HEAT.

If you draw ENERGY-BALANCE and MASS BALANCE, you will find that it is not possible/acceptable.

DHAYANANHAN.S