Smith, Corky

Western Dry Kiln Clubs

Western Dry Kiln Clubs. Meeting (31st : 1980)

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WOOD WASTE AND HEAT SINKS FOR ENERGYCorky Smith Sr.Olivine CorporationBellingham, WashingtonWe were recently in Australia and I observed one companydrying Radiata Pine. The pine was put into a kiln and a heavyconcrete slab about 18" thick was put on top of the lumber tokeep it from warping, etc. The temperature was considerablyhigher than anything presently in use in the U.S.A. The dryingtime of the lumber was just 8 hours--three batches every 24 hours.One interesting thing is that they burned up two dry kilnswhile experimenting.One other interesting development the Australians are workingon is continuous drying, stacking green lumber on top of the kilnand taking it off the bottom of the stack after the lumber isdried. The process is only in the experimental stage so far.There is a 20' diameter by 42' high Olivine Silo Burner thatburns 8 tons per hour of bark at Ronald, Washington, near CleElum, Washington (80 miles east of Seattle). The burner has one20 H.P. underfire fan and five 5 H.P. overfire fans blowing air ina counter-clockwise tangential direction. The bark is slung intothe middle of the burner by a rubber belt traveling at about 1100F.P.M.Standing next to the burner is a railroad tank car cut intwo and both halves are stood on end with a heat duct pulling1400°F hot combustion gases from the top of the burner up throughthe tanks filled with about 8' of rock. Water at 120°F runs downover the rocks and out the bottom of the tank at 140°F. Thisarrangement heats approximately 1500 gallons of water per minute.We are using two 60 H.P. fans to draw the flue gas from thetop of the burner to the bottom of the two tanks of rock and outto the atmosphere. The savings of burning bark to heat the waterover previously using diesel oil is $1500.00 per day.The excess heat not used to heat the water is exited to theatmosphere out the top of the burner.The next discussion here is about the combination of SiloBurner hooked up to a silo type refractory tank filled withproperly sized rock.The gases from the waste fuel are drawn down through therock and cooled with ambient air to the proper temperature andblown into the kiln.This rock system has been used in the steel industries sincethe 1800s. The advantage of the rocks is using it as a heatsink, filter, and spark puter outer. The burner can be run 8hours and the dry kiln used for 24 hours.The exhaust from the burner going through the rock heat sinkis so clean and clear that a seagull flew right through theexhaust heat. The bird landed, shook his head, stretched hiswings, wondered what happened, and flew off again.We are presently working on hooking steam boilers to theburner for generating electricity and using the low pressure90exhaust to heat the dry kilns. We are also working on compressingthe hot air from the flue gases after it goes through a heatexchanger, and generating electricity and using the exhaust heatto dry lumber.The big advantage of the Silo Burner and related heatrecovery systems is that it is so simple and very inexpensive toconstruct.The ideas of using waste to make heat are unlimited andvery exciting. The Arabs have really put us into the wasteburning business.Thank you for being such a friendly group.91

Wood waste and heat sinks for energy

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Wood waste and heat sinks for energy

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