BFS Zer-O-Pac deaerators · distributed by ExoCarbo

Condensate tank or deaerator?

A practical guide to justify adding a deaerator to your boiler room

1Your boiler room

Total installed capacity

Operating pressure

psig

Operating hours per year

Natural gas price delivered, taxes included

$/m³

Boiler efficiency

Make-up water metered water, sewer and softener salt

$/m³

—lb/h of steam

—CAD $ per 1,000 lb of steam

2Sulfite and blowdown

Condensate returns % of steam produced

TDS of softened make-up water

ppm

Maximum boiler TDS

ppm

Condensate tank temperature

Sulfite residual in the boiler excess kept as a safety margin, 20 to 40 ppm

ppm

Sulfite price catalyzed solution, as delivered

$/lb

Sulfite content of the delivered product SDS: catalyzed powder ≈ 95%, solution 30-40%, water-treater blend 10-30%

Blowdown heat recovery

	Tank	Deaerator	Difference

3Hot condensate returns

Share of returns above 212 °F pressurized returns, flashing on arrival

Their temperature

Temperature of the other returns

	Tank	Deaerator	Difference

4Vent and sparging

Loss at the open tank vent uncondensed sparge steam + evaporation

% of feedwater

Deaerator vent BFS: ½% of deaerating steam

% of deaerating steam

	Tank	Deaerator	Difference

5Economizer

Do you have a flue-gas economizer?

Stack flue-gas temperature

	Tank	Deaerator	Difference

6Residual oxygen and risk

Replacement cost tube bundle, economizer or condensate piping

Horizon

years

Probability of an oxygen-related failure with a tank, over the horizon

Same probability with a deaerator

	Tank	Deaerator	Difference

7Summary

	Tank	Deaerator	Difference

Extra cost of the installed deaerator optional — to compute the payback

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