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Test Your Knowledge: Boiler Blowdown


Test Your Knowledge: Boiler Blowdown


Why do we surface blowdown?

          A. To remove the dissolved solids that have concentrated in the boiler due to evaporation

          B. To remove condensate as rapidly as possible to eliminate water hammer

          C. To increase pressure of hot water and heat to generate increased flash steam

          D. To reduce the heat of vaporization of water molecules before they convert to steam

 

The answer...

      A. To remove the dissolved solids that have concentrated in the boiler due to evaporation

  

How Does Blowdown Affect the Plant?

Too Much Blowdown

  • Increased fuel costs
  • Increased water costs
  • Increased chemical costs

Too Little Blowdown - High TDS will occur resulting in:

  • Foaming
  • Priming
  • Corrosion
  • Scale

Energy Savings – Blowdown Heat Recovery

  • Blow down is 5-10% of boiler capacity
  • Recovery systems can capture steam that would normally be vented
  • Pre-heat make up water
  • Reduces water usage to cool the blow down prior to the drain


 

1 comment (Add your own)

1. Steve wrote:
Can bottom blowdown go vertically after your slow closing valve near or right off the boiler to a certain height. Then run horizontal pitches towards tank ,then back down into the tank with a tee then the dead valve for drain? Special cases where foot traffic is an issue ? All blow down piping rise to a certain height at the tank , depending on the tank . I've seen 30" 48" 65" , just wondering nothing I have read in codes . No forums online states upward piping in blowdown/blowoff piping , may be a stupid question

Wed, February 15, 2017 @ 9:50 PM

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