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Condenser heat recovery vs ACC

Wednesday, February 21, 2018   By: karthick [2235] 0 Stars
Hi friends,

This topic relates to a waste-to-energy plant of 15 MW capacity.

I am a student currently working on utilizing the heat lost during the condensation process as the steam exits from the turbine. We have an air-cooled condenser ACC system which is used to condense the steam from turbine exit temperature-60 C, pressure-0.15 bar, flow rate-1.85 kg/s and the condensate water is pumped to the feedwater tank at 50 C.

The ACC consumes nearly 100 kW of electrical energy to condense the steam into water. I was wondering if this ACC be replaced with a heat exchanger or other viable systems that are capable of taking up this condensation heat and be utilized for some processes.

Is this idea feasible and if yes, could someone point out the commercial systems installed to utilize the condenser heat ?

Many thanks for the help in advance.

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Saturday, February 24, 2018   By: Ross [390] 5 Stars
What you seem to be asking is there a practical application for low grade heat not being used in a surface condenser, heat exchanger, or an air cooled condenser ACC. This is yet to be solved.

I know I did not answer your question, but maybe someone else will.


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Saturday, February 24, 2018   By: cmolanes@itba.edu.ar [50] 4 Stars

Your idea is quite feasible, and in fact it is done whenever possible, but the racionality and economy gain may vary a lot, depending e.g. on geographical situation. I have read, though not witnessed, that in some cold climates as in Germany, the heat from the condenser is used to heat either houses, or streets to avoid icing. In subzero conditions, even 32C from a high vacuum condenser is quite hot...

If the condensing water is warm enough you can surely use it to feed a heat exchanger, or use it to distillate seawater, as is done aboard ships 60C is quite enough if you distillate under vacuum, on ships water around 80C is used.

Just a couple of ideas, you can surely devise other possibilities. Just begin working the thermodinamic tables and basic heat exchangers preliminary designs to check if your idea is worth while.

Claudio Molanes

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Saturday, February 24, 2018   By: Ross [390] 5 Stars
Thanks for the information. Ross

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Monday, February 26, 2018   By: basem belal [2194] 2 Stars
Agree with Mr. Ross, this matter is not yet solved, but I would like to add small note, to use condensing heat is OK but to use heat from warm condensing will be other losses that we have to heat up again this warm condensing, it can be use last idea heat from warm condensate but not for recovering heat losses in condenser.
there are some application use combined system of dry cooling system with wet cooling system and this working on decreasing condensing temperature to decrease losses during hot weather.

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Monday, February 26, 2018   By: Jim Watts [764] 5 Stars
Your idea is a very fundamental one but is where the ideal world hits the practical limits and cost to recover heat is higher than the benefit except in very cold climates.
You would be far better off getting the best out of what you already have.
Your turbine is exhausting 5 degrees above saturation and your condensate is 5 degrees lower.
You probably have a fouled turbine and air in your condenser.

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superheated steam ideal gas
By: cmolanes@itba.edu.ar [50]

Mr. Pradeep:

Steam behaves well as an ideal gas if not too close to the saturation line if you place yourself on a Mollier chart, when the temperature and enthalpy lines coincide and are straight, horizontal lines, then it behaves as ideal, and this you can easily see on the chart.

I would rely though most on the steam values given by the chart or steam tables, because they are confident independently of the region , e.g. they stand both for ideal and real gas, but the ideal gas equation ....   Read All
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