Kraft Canada Inc., Cobourg, Ontario, Canada

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Courtesy of Thermal Energy International Inc.

Industrial Dryer Application

BOILER PLANT APPLICATIONThermal Energy designed, built and installed two FLU-ACE heat recovery systems to reduce plant energy costs.

The first FLU-ACE tower was designed to recover 24 MMBTU/h (at peak) and 11 MMBTU/h (winter average) of otherwise wasted heat. Stainless steel breeching collects hot gases from three separate exhausts (two rice process dryers and one rice steamer). Recovered heat, in the form of 150 óF water, is sent to three plate heat exchangers which are used to heat:

  • Rice Process makeup water
  • Rice and Cereal Process wash water
  • fresh air makeup (through a secondary glycol heating circuit)

The FLU-ACE System controls distribution pumps and heat exchangers are grouped inside specially designed enclosure for easy maintenance and accessibility.

A second FLU-ACE system receives hot exhaust gases from two 70,000 lb/h boilers. Recovered heat, in the form of 150 óF water, is sent to three plate heat exchangers which are used to heat:

  • boiler makeup water
  • fresh air makeup (through a secondary glycol heating circuit)
  • Rice Process wash water

The average heat recovery rate is 6.9 mmBTU/h

Benefits

  • Significant reduction of boiler fuel consumption.
  • Increase of the overall efficiency of the boilers to 96%
  • Recovery and reuse of 80 to 90% of the waste heat

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