Huge improvements achieved with Balance+ project in Kanteleen Voima, Finland
ÅF's office in Tampere Finland has finished Balance+ control renewal in Kanteleen Voima which is located in Haapavesi, Finland.
The net capacity of the pulverized peat fired once-through boiler is 154 MWe which makes it world’s largest peat fired condensing power plant. Balance+ project started in summer 2013 and the commissioning was done in December.
The plant uses very challenging fuel for once-through boiler; peat and wood, which varieties in quality, moisture and heat value. Fuel variation causes lots of disturbances to plants controls which are very difficult to handle with conventional solutions. Balance+ control concept was able to stabilize this complex process with remarkable improvements.
With advanced Balance+ controls plant can use low quality fuel and achieve the needed load demand. The total MWe control is now very accurate, deviation of net electric power is now ± 1 % and before it was ± 6, 5 %. This enables to run the plant stable in minimum and maximum load level. The boiler life-cycle can be also increased due to less stress to boiler.
Main improvements achieved with Balance+ controls (based on the Balance+ performance report):
- Better boiler efficiency
- Stable steam flow and combustion process
- Evaporator temperature deviation is now ± 0,8 % and before ± 2,3 %
- Less feed water deviation, now ± 1 % before ± 10 %
- Accurate steam temperature control and less difference between left and right side
- Superheat temperature deviation is now ± 0,3 % and before ± 2,2
- Reheat temperature deviation is now ± 0,9 % and before ± 3,2 %
- Slagging is also decreased due to stable steam temperatures
- Possibility to use low quality fuel (high moisture, low and variety heat value)
- Reduction of house load by decreasing feed water pump, induced draft fan and secondary air fan power
- Flue gas excess oxygen level is lower, there is no side difference
- Deviation was before ± 37 % and with Balance+ it is ± 7 %
- NOx and SOx emission levels are lower and production of dust is smaller
- Better usability and less maintenance costs
- Also many other improvements which comes in future.
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Before Balance+ steam flow [kg/s> and net electric power [MWe]
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