RENEWABLE FUEL INDUSTRY NEWS
system at M-SE’s Combined Heat and Power plant.
so close to the existing one. In some places, we had to blast out hard rock and in other places, we had very soft clay, so we had to insert numerous piles down to 20 metres to support the civil construction.”
All challenges were overcome with excellent co-operation, according to Lackinger. “We started cold commissioning in May, 2015, with hot commissioning following three months later.
The plant was fully taken over by M-SE in July, 2016, after good collaboration with our start-up team,” he confirmed. “Our plant operates seven months of the year and ran at full load for the first time last Winter,” affirmed Production Manager Anders Ejhed. “Start-up went well. It took us some time to tune and optimise the operations, mostly focused on getting the biomass fuel mix right.”
Ejhed explained that there were things for his team to learn. He pointed out that, “The Bubbling Fluidized Bed boiler was new
10 Winter 2016 10
Left to right: Anders Ejhed, Production Manager; Christian Lackinger, Andritz Project Manager; and Christer Kjellberg.
technology for us,” adding, “Andritz people have been here to support us at all times. The downtime during the Summer months was a perfect opportunity for us to iron out any problems with the fuel, adjust the boiler and thoroughly train our team at the site”.
One of the main features of the new Mjölby plant is the flexibility to adjust the electrical output
from the turbine according to where the energy output of the boiler is needed most or is most economically viable. Lackinger explained, “The main target is to provide district heating, but M-SE installed a turbine to also produce electricity. From the total fuel value of the wood chips, it is possible to produce 23 MW for the district heating network and 10.8 MW of electricity. If you put all the steam to the turbine, the ratio
of electricity-to-steam is about 1:2. In most plants, if you reduce electrical output, you also reduce district heating energy. “The Mjölby plant is a bit different. We direct part of the steam to a heat exchanger that converts this steam input directly to district heating energy. So, M-SE can produce down to about 2 MW of electricity and up to about 31 MW of district heating energy at the same time. This allows them to adapt to heating requirements from the community, fuel mixtures and the need for electrical energy.” So what is the next step for the Mjölby plant? Kjellberg concludes, “We expect the plant to operate at around 90% efficiency and we have plans to improve this even further by installing a flue gas condenser. We already have the infrastructure in place to install it. “This will be our next
investment, which will take our efficiency to around 98%.” More information from www.andritz.com
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