ThermTech Limited

ThermTech Limited

Activated carbon regeneration furnance waste heat recovery system - Case study

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Courtesy of ThermTech Limited

A UK-based edible oils processing plant use activated carbon in order to clean up various contaminants contained within the oils for product quality reasons. The spent carbon is regenerated on-site in a gas fired rotary hearth furnace and the hot exhaust gases (700°C) from the furnace are a valuable high grade source of waste heat.

Waste heat recovery system installed for a UK based edible oils processing plant

Due to the contaminants contained within the furnace exhaust gases, they were being cooled down to below 220°C with quench water before entering a Venturi scrubber and then sent to atmosphere.  ThermTech were appointed to design a waste heat recovery system which would improve efficiencies at the plant.

Heat Recovery Solution

ThermTech have successfully harnessed this waste heat into a waste heat recovery system which generates approximately 1,500 kg per hour of steam at 13 bar g pressure, fed directly into the site’s high pressure steam main, saving ~£250,000 per year in natural gas at the boiler house, a reduction of CO2 emissions of ~1,700 tonnes/per year and a reduction of quench water evaporation of ~30 L/min.

Several factors were vital to the successful operation of the plant:

  • The regeneration furnace pressure is critical and has to be maintained under all conditions
  • The existing exhaust gas Venturi Scrubber, ID fan and furnace pressure control system has to remain unchanged with the waste heat recovery system either in or out of circuit
  • The plant runs 24/7 and only shuts down once per year
  • The furnace gases contain considerable amounts of dust, water vapour and other contaminants
  • The furnace exhaust point is at the top of a 30m high building

Of the above points, the most critical is the furnace pressure control and is the heart of the project success.

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