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than water. Nechako Lumber provided a brief description of the system. Key is the hot temperature thermal oil system used primarily to provide heat in Nechako Lumber’s dry kilns. A turbogenerator uses the thermal oil to pre-heat and vapourize an organic heating fluid. Vapour from that powers a turbine directly coupled to an electric generator. The exhaust vapour flows through a re-generator where it heats the organic fluid. The vapour is then cooled by water flow. The organic liquid is then pumped to the re-generator and an evaporator as part of the closed loop circuit. The ORC system is essentially a method of local energy production, points out Turboden’s Foresti. “It’s a local resource used locally and the resource is heat.” Nechako Lumber’s tradition of innovation continues with energy project A tradition of innovation is continuing at Nechako Lumber’s mill in Vanderhoof, British Columbia. Recently retired local owners Mike Manojlovic and Torall Scott were always looking for new ways to improve their mills. The tradition includes the first HewSaw in North America and being the test site for log crack detection systems in the sawmill. On the planer side, it was the first in the industry for lumber grade scanning with Comact. The mill also introduced high speed planer technology with Gilbert, hog fueled energy systems to heat dry kilns with Del- Tech and the first large scale wood pellet plant in B.C. The tradition is continuing with the Nechako Green Energy Project, a ‘waste’ heat recovery system that’s the first of its kind in the Canadian sawmilling industry. The existing Del-Tech biomass burning system uses all the hog made by the 200 million board feet/year stud mill operation. All the sawdust, shavings and fines stay on site for the 145,000 MT/year pellet plant. The existing hog fueled system had excess heat going up the stack and that’s where the green energy project comes in. “By capturing the excess heat we are able to generate up to one-third of our total electrical demand, enough to almost completely power our pellet plant operation,” says Alan Fitzpatrick, general manager. “We are looking within our operations for additional sources of generating electricity and we selected a unit that will also let us use the remaining heat for future products, possibly to heat our buildings or pre-dry our sawdust for the pellet plant for example,” he adds. All contents of this article are copyright© 2009 by Logging and Sawmilling Journal and may not be rerpoduced in any form without express written consentPDF Image | Turning the wood residue power switch Nechako Lumber
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