Norwegian Energos-plant breaks own record for uptime
2020 was a record year for WtE plant Sarpsborg Avfallsenergi AS, which had an operating time on its Energos incinerators of almost 8,300 hours. Geminor delivered a total of 50,000 tonnes of waste fuels to the energy recovery plant last year.
In 2020, Sarpsborg Avfallsenergi (SAE) recorded a total of 8,273 hours of operation time for one of its two production lines. This is the highest number of hours registered since the plant started operating in 2010. SAE incinerates around 80,000 tonnes of residual waste annually, of which 50,000 tonnes have been delivered by Geminor annually since 2012.
SAE produces steam which is mainly used by Borregaard’s production plant in the region. Last year the company produced around 220 GWh of energy in total. The average annual uptime for the plant has since the opening been 7800 hours.
Keeping Energos running
The waste plant uses the Norwegian-developed combustion plant from Energos, which is built with secondary combustion chambers making the plant more clean-burning than the industry standard. However, the Energos requires better sorted and treated waste than other plants, but in return, it burns several types of waste such as industrial waste and hazardous waste in addition to household waste. At SAE, all waste is ground a second time, and metals are removed before use.
The general manager at SAE, Frode Schjolden, is pleased that the operational time was extended during 2020.
– Operating a combustion plant on residual waste is an ongoing maintenance job. The fuel is far from homogeneous and will change almost from load to load. The uptime record in 2020 indicates that we have managed to anticipate the problems before they arise, which is important in having a successful operation, says Schjolden.
– Technology like this is sensitive and requires the use of specially adapted waste fractions. If the waste contains elements such as plaster, insulation, or larger quantities of chlorine, we will soon run into problems. It takes many years to build experience on waste incineration, and we make continuous adjustments to improve our operation, says Frode Schjolden.
SAE’s strict requirements emphasize the importance of having full control over the design and supply of waste fractions, says CEO at Geminor, Kjetil Vikingstad.
– Delivering the right quality and waste fuel mix – including the right calorific value – often determines if off-takers can operate at their full potential. The “wrong” fuel can quickly lead to challenges and considerable costs. To make sure that the waste fuel holds the right quality, Geminor spends a lot of resources facilitating for the individual off-taker. This is essential as the waste fuel supply normally is coordinated from several different countries, says Vikingstad.
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