Waste heat recovery from Steam boilers
Your Steam boiler has waste heat recovery potential
Improve boiler efficiency
Steam boiler efficiency can be improved to >95%, by using a polymer air preheater or economiser.
Lower CO2 emissions
Every 1% efficiency increase of your Steam boiler results in 1% CO2 emission reduction.
Decrease fuel costs
By recovering additional waste heat, less fuel is needed to achieve the required duty of your Steam boiler.
Waste heat recovery on Steam boilers is limited by corrosion and mechanical failures
How to recover more waste heat from your Steam boiler
Heat recovery systems for Steam boilers
Polymer Air PreHeater
Heat up combustion air or drying air by extracting heat from flue gas. The air preheater is corrosion resistant & anti-fouling and is easy to maintain and clean.
Stainless steel or Polymer Economiser
Warm up boiler feed water, make-up water or process water with waste heat from flue gas. The economiser is corrosion resistant & anti-fouling and is easy to maintain and clean.
Carlsberg
4% boiler efficiency increase
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.
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 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 air preheater. Based on the success in Ukraine, Carlsberg Serbia introduced the same solution on their biogas fired boiler.
Technical Assessment of heat recovery on your Steam boiler
- Analysis of process data of your steam boiler
- Minimal input data required
- Business case on your savings potential
FAQ's about Steam boilers
How does an industrial steam boiler work?
An industrial steam boiler is a closed vessel in which water is present. Fuel (natural gas, oil, coal or biomass) is combusted in pipes that are in the water vessel. Hot gasses are produced. These hot gasses heat the pipes that are in the water vessel which transfers the heat to the water. Steam is produced in the boiler.
What are industrial steam boilers used for?
How does waste heat recovery on a steam boiler work?
In a steam boiler the heat from the flue gas is transferred to the water, which then turns into steam. Downstream of the boiler the flue gases are still high in temperature and are typically 50ºC or more above the steam temperature. Flue gas heat exchangers downstream the boiler can recover this waste heat and improve the boiler fuel efficiency.
Waste heat recovery options from a steam boiler?
For heat recovery on a steam boiler the following types of flue gas heat exchangers can be installed: a steam super heater, an economiser to preheat boiler feed water, an air preheater to preheat the combustion air, a condenser to heat-up make-up water or process water.
Benefits of waste heat recovery on a steam boiler?
Recovery of the waste heat on a steam boiler improves the fuel efficiency and reduces CO2 emissions. If the condensation energy can be recovered, a boiler efficiency above 100% can be achieved.
