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Free heat from an incinerator

At a large midwestern printing plant, solvents used in ink from presses generate harmful vapors. Two regenerative thermal oxidizers, with a combined 70,000 CFM exhaust, incinerate the VOCs. But rather than let all that heat go to waste up a stack, the company wisely uses it to heat its facility.

Two Munters Thermo-Z® air-to-air heat exchangers, one on each incinerator, capture the exhaust heat and use it to heat outside air for plant makeup air in winter. Each heat exchanger is part of a complete packaged heat recovery system that also includes supply and exhaust fans, dampers, and filters.

Under design conditions, the systems heat outdoor air from -10°F to 130°F using 250°F exhaust from one incinerator and 350°F exhaust from the other. Combined, they can transfer over 10,400,000 BTUs per hour. The temperature to the space is controlled to a consistent 130°F by modulating the hot gas flow through the heat exchanger. Munters air-to-air heat recovery system successfully helped the printing plant recycle energy and save on costs.

Quick facts

  • Provides free heat, eliminating building heat costs
  • Energy savings of $250,000 annually
  • Eliminates negative pressure problems
  • One-year payback

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