CO2 saving processes

Energy recovery from flue gases

Increasing economic efficiency and reducing the CO2-emissions with energy recovery units in your industrial process.

Energy saving is a key success factor when trying to achieve a reduction of the carbon footprint, it can be made by improving process efficiency to recover waste heat, not only from the production process, but also from the hot process gas that in many cases is simply released into the atmosphere, unutilized. 

The saving of energy costs and the reduction of CO2 emissions by avoiding fossil fuels make an Energy Recovery Plant an investment that not only provides competitive advantages that positively impact the final product cost, but also helps preserve our environment for the future generations.

GEA offers WHR (Waste Heat Recovery) units alone or in combination with gas cleaning technologies as well, using heat exchanger systems suitable for waste gas conditions such as dust content.

These heat exchanger units have been used in diverse projects worldwide and have proven reliable and highly efficient. 

Usually, the GEA energy recovery system consists of:

  • Waste Heat Recovery Units
  • ORC module

The heat recovered from the flue gas can be used for: 

  • power generation
  • compressed air production by use of thermal oil
  • local and district heating networks
  • heat for industrial processes

Particular features

  • Process-optimized heat recovery
  • High serviceability
  • High modular flexibility, apt for narrow spaces
  • Quick ROI (Return of Investment), sustainable reduction of energy costs
  • Electricity production by ORC (Organic Rankine Cycle) technology

Working Principle

Working Principle of Energy Recovery from Flue gasesThe largest sources of waste heat for most industries are exhaust and flue gases. Either as high-temperature gases from burners or at lower temperatures within the air treatment process.
Cement industry

Waste heat  can be recovered from the clinker cooler waste gas as well as the preheater waste gas. Different heat exchanger systems shall be used for the two waste gases, because of the difference in dust content.

The heat can be used for the operation of an ORC turbine for power generation or to generate hot thermal oil or water for other uses. 

The use of the heat energy in the gas cleaning process in the SCR is possible as well:

Glass industry

Depending on the available gas temperature upsteam and downstream the gas cleaning, the waste heat can be recovered at two different stages of the cycle.


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