Catalytic Oxidizer VS. Regenerative Thermal Oxidizer
Technical Corner
Catalytic Oxidizer VS. Regenerative Thermal Oxidizer
Energy Comparison
A flexographic printing company will be replacing their existing Catalytic Oxidizer with a Ship & Shore Regenerative Thermal Oxidizer (RTO):
Both systems have a flow of 12,000 SCFM and the same VOC load.
The Catalytic Oxidizer has a 72% effective heat exchanger. The RTO has 95% efficiency heat recovery.
The follow calculations are hypothetical and do not take heat losses into account.
12,000 SCFM RTO operating without VOC at 95% effectiveness requires:
12,000 x 60 x 28.24 x 0.05 → 1.01 MMBTU/H
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With a VOC energy contribution of 27 lbs/hr or 4.08 MMBTU/H, at 98.5% destruction efficiency, the RTO burner will be at:
1.01 – 0.408 → 0.602 MMBTU/H
Assume the 12,000 SCFM Catalytic Oxidizer with a 72% effective heat exchanger is operating at 600°F with the same VOC load as the RTO, the burner will be at:
(10.17 – 8.09) x 12,000 x 60 → 1.49 MMBTU/H
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Savings compared to catalytic oxidizer is:
1.49 – 0.602 → 0.888 MMBTU/H or 8.88 therms/H
At operation of 24 hours/day, 7 days/week, 50 weeks/yr
8.88 x 24 x 7 x 50 → 74,592 therms/yr
at $1.00/therm → $74,592/yr
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