Flue gas of a biogas co-fired steam boiler cooled below the acid dew point without any corrosion issues.

4% boiler efficiency increase

290 kW heat recovered

Payback time 1 year for equipment

Making the manufacturing process more sustainable

Within the Together Towards ZERO program, Carlsberg strives to make their breweries more sustainable. One of the steps taken in their Ukraine brewery is using a biogas fired steam boiler. 

Sulphuric acid problems prevented additional heat recovery

Due to the usage of biogas, high concentrations of sulphur elements can be found in the flue gas. If the flue gas is cooled down, these sulphur components condense and form sulphuric acid which is very corrosive. To prevent this from happening, Carlsberg operated their system such that the flue gas was at a high temperature (>140 °C) leaving the stack. Additional heat present in the flue gas was not used.

HeatMatrix Polymer APH allowed cooling through the Acid Dew Point

HeatMatrix installed a Polymer Air PreHeater which allowed Carlsberg to cool to temperatures below the acid dew point and achieve additional heat recovery on their steam boiler. There are no corrosion issues because of the corrosion resistance of the polymer used in the HeatMatrix APH. Based on the success in Ukraine, Carlsberg Serbia introduced the same solution on their biogas fired boiler.


Solution has a duty of 290 kW
Boiler capacity 20 TPH
Flue gas flow 15,000 kg/hr
Temperature flue gas flow 142 °C
SO2 concentration 71.5 mg/Nm3 SO2
Installed System HeatMatrix polymer APH

For more than 10 years we design and deliver heat recovery systems for industrial factories


Technical Assessment of heat recovery on your Steam boiler

Our process engineers assess the technical feasibility of additional heat recovery on your Steam Boiler. The potential reduction in CO2 emissions, energy consumption and costs is determined.