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Valmet


Industry News


Beating NOx emissions with optimised combustion


P


ohjolan Voima, a major player in the Finnish energy sector, accounts for approximately 20%


of the country’s total electricity production. At its 22 power plants, it produces electricity and heat for its shareholders – export industry companies, energy companies and cities – with hydro-thermal and nuclear power. With emissions limits tightening at the end of the Industrial Emissions


14 Forest Bioenergy Review Summer 2020


Pohjolan Voima’s values – skillfully, boldly and together – came to life when the company succeeded in reducing NOx emissions and improving energy efficiency through combustion optimization and data analyses at its two biopower plants. Text by Marjaana Lehtinen, Photos by Hannu Vallas and Kai Tirkkonen


Directive (IED) national transition period, the company had to find a way to reduce NOx emissions at two of its biopower plants, Kymin Voima in Kouvola and Kaukaan Voima in Lappeenranta, Finland. Additionally, at both plants the company wanted to improve boiler efficiency, and at Kaukaan Voima reduce ammonia consumption.


Focus on combustion management Both plants produce process steam, district heat and electricity, and the main fuels are forest industry side streams and forest residues. Their fuel mixes vary according to the season. Kymin Voima’s boiler utilises bubbling fluidized bed (BFB) technology. Kaukaan Voima’s boiler plant utilises


circulating fluidized bed (CFB) technology. The customer understood that the technical challenge with emissions management actually lay in combustion management. “The problem is often connected with fuel input. When the boiler furnace is wide, even as much as ten or 20 metres, it’s challenging to feed the fuel evenly


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