Some semi common BITOG names

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Methacrylate polymers
Zinc Orthophosphates

Where else in a power station would these chemicals end up in a non oil based application ?
 
The former is PMMA (aka Plexiglas), frequently used to make explosion proof light fixtures, important in the turbine hall.

The latter would likely be some manner of anti-corrosion coating?
 
Methacrylate polymers
- Added to hydraulic fluid to improve cold temperature performance
- if in the form of a Cyanoacrylate it's probably a adhesive like super glue or locktite.

Zinc Orthophosphates
- Added to cooling water to reduce deposits and corrosion
 
SR5, the second one is correct.

The methacrylates are also used in the cooling water. Their polymer structure inhibits the size of the scale particles that can form on heat exchanger surfaces...and Lubrizol make/supply some.
 
Is the steam condensed and recycled, or is it lost in a single use? It seems that if new water is "hard" recycling would make sense.
 
Originally Posted By: userfriendly
Is the steam condensed and recycled, or is it lost in a single use? It seems that if new water is "hard" recycling would make sense.


Condensed and re-used.

700MW takes about half a tonne per second of steam at 16MPa and 538C...need to keep it all in the cycle.

The Condenser is maintained at 6-8kPa absolute (so quite a heavy vacuum), so the condensing takes place at around 35-40C, with the heat moved to the Circulating water (and then onto the towers)...that system runs at around 15,000L/sec, and is where these chemicals would be used, as the evaporation in the towers concentrates the salts in the water.

The water on the clean side (to the boiler) is put through a demineralisation plant before use, and on the return after being condensed goes through another online "polishing plant", which is another demineralising plant to get rid of anything that might have been picked up in the cycle.

Dosed with Ammonia (for pH), and Hydrazine/Carbohydrazide (oxygen scavenging), it gets pumped back to the boiler.
 
Can water be captured from the exhaust or is it lost to atmosphere? For example, how much H20 is produced burning 50,000 tons of coal per day that falls as acid rain? Exhaust from natural gas would be cleaner, but where water is politics, there is water going up in smoke.
 
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