Hydrogen dew point in power generators

In summary, large power generators, such as 200 MW, use H2 in gas form for cooling, with a temperature range of +45 to +75 "C. Hydrogen dew point is crucial in maintaining safety, as even small amounts of atmospheric air contamination can lead to explosive mixtures. Therefore, monitoring the dew point of the hydrogen is important in detecting and preventing potential hazards. This is easier to measure and monitor compared to other factors such as total moisture or oxygen levels.
  • #1
abolfazlghasemi
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Large power generators (for example 200 MW) are cooled by H2 in gas form. H2 temperature is +45 to +75 "C. So why hydrogen dew point is important in generator while the lowest hydrogen temperature is 45 "C? And in some Power Stations is monitored online...
Thanks, a lot
 
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  • #2
Welcome @abolfazlghasemi !

Hydrogen is an excellent cooling agent, but is highly explosive when mixed with air.
For that reason is very important to keep both separate.
Some atmospheric humid air can still slowly leak into the hydrogen occupied volumes.
Since it normally contains some water vapor diluted in it (absolute humidity), monitoring the dew point of the hydrogen can tell how much air contamination has happened and how closer to an explosive mix it has become.

Please, see:
https://greenrenpower.com.au/products-and-services/electrolysers/how-h2-cools-generators/

https://able.co.uk/media/2015/08/re...ment-for-electricity-generator-protection.pdf

:cool:
 
  • Informative
Likes berkeman and Tom.G
  • #3
I had always understood the varnish winding to be pretty hydrosopic - the issue is not dew point, but total moisture in the system. Dew point is easier to measure and monitor. BUt similarly - I could see it being easier to maesure Dew point then O2 as well - but it would have less correlation.
 

1. What is the significance of hydrogen dew point in power generators?

The hydrogen dew point is an important factor to consider in power generators because it affects the efficiency and reliability of the equipment. If the dew point is too high, it can lead to condensation and corrosion within the generator, potentially causing damage and reducing its lifespan.

2. How does the hydrogen dew point affect the performance of a power generator?

The dew point of hydrogen can impact the performance of a power generator in several ways. Firstly, it can affect the amount of moisture present in the generator, which can impact the combustion process and decrease efficiency. Additionally, high dew points can lead to the formation of water droplets, which can damage sensitive components and cause malfunctions.

3. What factors can influence the hydrogen dew point in power generators?

The primary factor that influences the hydrogen dew point in power generators is the temperature of the surrounding air. The higher the temperature, the higher the dew point will be. Other factors that can influence the dew point include the amount of hydrogen present, the pressure, and the composition of any impurities in the hydrogen gas.

4. How can the hydrogen dew point be controlled in power generators?

To control the hydrogen dew point in power generators, several measures can be taken. These include using a dehumidifier to remove excess moisture from the air, ensuring proper ventilation to prevent the buildup of humid air, and using dry air purging systems to remove any moisture that may have entered the generator.

5. What are the consequences of ignoring the hydrogen dew point in power generators?

If the hydrogen dew point is ignored in power generators, it can lead to various issues. These include reduced efficiency and performance, increased risk of equipment damage and malfunctions, and potential safety hazards. Ignoring the dew point can also result in costly repairs and downtime for the generator.

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