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Bioenergy no 3 May 2015

FEATURE: BIOENERGY IN INDUSTRY Bioenergy International No 79, 3-2015 15 ments have been done while maintaining a long-term perspective in mind. – We have thought long term. When designing previous mill modifications, we built so that there is room for later capacity expansion. This applies both to the soda recovery boiler, the lime kiln and the evaporator. Now that we are almost doubling the annual pulp production from 425 000 tonnes to 700 000 tonnes to become the world’s largest softwood pulp mill, it is possible to build within the existing units. – We will be able to push up the recovery boiler from 350 MW to 500 MW. In the same way, we can cope with the increased production with the existing lime kiln. – We have had a board that has supported us in this strategy. It has meant a lot to us that we had their full support. Not everything has been possible to implement though. A few years ago there was a project with Norwegian utility Statkraft investigating the feasibility of selling district heating to the town of Kungsbacka, north of Värö. Although it was very close the economics did not work out. However the project illustrated that it would be possible to take out more energy from the pulp mill and supply it externally. There is still more residual heat to make use of. The lignin may also be used in the future. Today it makes up a significant portion of the black liquor, which is the major source of fuel for the mill. Text: Kjell Andersson Photos: Thomas Carlén BI79/4823/KA –We have previously implemented measures that have had a positive external energy effect of 900 GWh, and after our pulp mill capacity expansion that will go up to 1.6 TWh, says Jonas Eriksson (left) here with colleague Fredrik Tärneberg. “External energy effect” is, as Eriksson explains, the sum of reduced fossil fuel “imports” to Värö, increased energy efficiency and increased “exports” from the use of biomass fuels, green heat and electricity. Södra Värö, 15 years of incremental investment INVESTMENTS - to recover energy, switch to renewable and bioenergy Värö was built as a conventional pulp mill in 1972 to produce paper pulp using partly its own fuels such as black liquor, but also purchased oil and electricity. The journey to a fossil-free system that also delivers bioenergy to society started in 2001. Here are the key steps: tTVQQMZPGEJTUSJDUIFBUJOHUP7BSCFSH tXJUIBOFXSFDPWFSZCPJMFSBOEBOFXCJPUSFBUNFOUPQFSBUJPOUIFTVQQMZPGEJTUSJDUIFBUJOHDPVMEJODSFBTFCZ(8IPGIFBU GVMMZ drawn in 2007), and an additional 100 GWh of heat could be used internally. tJOTUBMMBUJPOPGBOFX.8CBDLQSFTTVSFUVSCJOFBOECSPXOTUPDLXBTIJOH*OTUFBEPGCVZJOH.8PGFMFDUSJDJUZGPSBUPUBMDPO- TVNQUJPOPG.87ÊSÚDPVMEOPXTFMM.8PGHSFFOFMFDUSJDJUZUPUIFHSJE"OOVBMDPOUSJCVUJPOPG(8IPGFMFDUSJDJUZ tBOFXTIPFQSFTTGPSEFXBUFSJOH1'&QSPHSBN FMFDUSJDJUZUBYDVUTJOFYDIBOHFGPSBDUJPO UPHFUIFSTBWJOH(8IPGFMFDUSJDJUZIFBU tBOFXFWBQPSBUJPOCBSLESZFSHBWFFYDFTTTUFBNBOESFMFBTFEN of bark, which is dried. 200 GWh bark and heat. tQSFIFBUJOHGFFEXBUFSPOUIFSFDPWFSZCPJMFSQSPWJEFT.8JODSFBTFEFMFDUSJDBMPVUQVUJODSFBTJOHQPXFSQSPEVDUJPOCZ(8I t*OnVFHBTDPOEFOTFSJOUIFSFDPWFSZCPJMFSJODSFBTFEIFBUFYUSBDUJPOXJUI(8IPGIFBU tOFXQSFTJFWFTUFQSFEVDFTFMFDUSJDJUZDPOTVNQUJPOCZ(8I tOFXUBMMPJMDPPLFSJODSFBTFTUBMMPJMQSPEVDUJPOCZ(8IBOESFEVDFTFMFDUSJDJUZDPOTVNQUJPOCZ(8I tPQUJNJTBUJPOPGUIFOFXTBXNJMMBOEQFMMFUQMBOUBTXFMMESZQPXEFSQSPEVDUJPOGPSUIFOFXMJNFLJMOBOEQFMMFUTGPSSFUBJM3F- QMBDFT(8IPGPJMJODSFBTFTCBSLBWBJMBCJMJUZGPSFYUFSOBMTVQQMZCZ(8IBOEQSPEVDFT(8IPGQFMMFUTBOEESJFETBXEVTU 5IFUPUBMFOFSHZHBJOTPGBSJT58IPGFMFDUSJDJUZIFBUGPSSFUBJMJOUFSOBMFOFSHZTBWJOHTESJFECBSLQFMMFUTUBMMPJMBOEPUIFSCJPGVFMT 5IJTBNPVOUPGFOFSHZJTDPNQBSBCMFUPUIFFOUJSF$)1EJTUSJDUIFBUJOHPG)FMTJOHCPSHBOE/PSSLÚQJOHDPNCJOFE5IFFYQBOTJPOPGUIFNJMM GSPNUPUPOOFTPGQVMQXJMMJODSFBTFFOFSHZTVQQMJFTGVSUIFS5IFFYUFSOBMEFMJWFSJFTXJMMJODSFBTFGSPN(8IUP58I JODMVEJOHUIFJOTUBMMBUJPOPGBOFX.84LPEBDPOEFOTJOHUVSCJOFXIJDIXJMMJODSFBTFUIFQSPEVDUJPOPGESJFECBSLUP(8IDPNQBSFE UPUPEBZT(8I


Bioenergy no 3 May 2015
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