Project purpose and mode of operation:

To improve the cooling of the flue gas from the plant's wood chip plant and thereby increase the plant's efficiency. Using the absorption chiller and associated scrubber system, the flue gas temperature has dropped from around 50° down to around 20°C, corresponding to a cooling effect of 1 MW. The efficiency of the wood chip boiler has increased from approx. 103% to 111%.

The absorption chiller's chilled water circuit is made of stainless steel and can therefore be passed through directly by the scrubber water. The chilled water circuit produces as cold water as possible, which is directed to the flue gas scrubber to cool the flue gas. Energy is absorbed from the flue gas and the heated water is returned to the chiller evaporator, which transfers the energy to the chiller absorber. The absorber is traversed by return district heating water, which is in series with the chiller's condenser. The condenser and absorber heat the district heating water to around 50°C and are shunted in the flow. The refrigeration machine is powered by district heating water at around 105°C, which means that the electricity consumption for such a machine is minimal.

SEG A/S role:

To deliver, install and commission an absorption chiller and train the operating staff in the use of the machine.

Description of the project content:

The absorption chiller consists of the following areas;

• Project planning and energy calculations for the absorption chiller.
• The absorption chiller and its components.
  • One piece of Thermax absorption chiller type LT27 T, dimensioned to provide 1 MW of cooling.