Industry News

Thanks to combustion optimisation, there is now no need for Kymin Voima to invest in an ammonia injection system at all. “We’ll be able to keep emissions below the upcoming tighter limits with our present technology and more accurate controls, as well as by reducing the use of NOx-containing fuels such as peat,” says Managing Director Antti Rainio at Kymin Voima.


throughout the furnace. The bubbling sand in the furnace contributes to good combustion, but it isn’t enough. Changes in fuel quality and mixture add to the challenge,” says Managing Director Juha Kouki at Kaukaan Voima.

Advanced process controls optimise combustion The solution for improving combustion management and consequently reducing the formation of NOx in the boilers was developed in close cooperation with Valmet. After a

process improvement study in the fall of 2018, Valmet DNA Combustion Manager, an advanced process control application for optimised combustion, was installed in the plants’ existing Valmet DNA automation systems. The advanced control application

manages the combustion process against variations in production, fuel amount, fuel quality and combustion circumstances, based on fuzzy logic, measurements and measurement data. Advanced control technology ensures even fuel input at all times.

“The most significant improvement

is more even fuel combustion throughout the boiler. The oxygen level after the furnace can be more accurately controlled and thus reduced too. In turn, this reduces the amount of flue gases and enables better carbon monoxide control. Combustion staging also improves, contributing to lower NOx emissions,” Managing Director Antti Rainio at Kymin Voima points out. The long list of other benefits

includes a reduced requirement for combustion air, which reduces the need

for auxiliary electricity, improving power plant performance. The lower amount of flue gases improves boiler efficiency. Power plant energy efficiency improves, because more heat and energy can be produced with the same amount of fuel. Heat losses also decrease, because less heat goes to the stack from a smaller amount of combustion air.

Lower chemical consumption Thanks to combustion optimisation, there is now no need for Kymin Voima

Summer 2020 Forest Bioenergy Review 15

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