Pipeline transport of biomass |
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Authors: | Amit Kumar Jay B Cameron Peter C Flynn |
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Institution: | (1) Department of Mechanical Engineering, University of Alberta, T6G 2G8 Edmonton, Alberta, Canada |
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Abstract: | The cost of transporting wood chips by truck and by pipeline as a water slurry was determined. In a practical application
of field delivery by truck of biomass to a pipeline inlet, the pipeline will only be economical at large capacity (>0.5 million
dry t/yr for a one-way pipeline, and >1.25 million dry t/yr for a two-way pipeline that returns the carrier fluid to the pipeline
inlet), and at medium to long distances (>75 km one-way] and >470 km two-way] at a capacity of 2 million dry t/yr). Mixed
hardwood and softwood chips in western Canada rise in moisture level from about 50% to 67% when transported in water; the
loss in lower heating value (LHV) would preclude the use of water slurry pipelines for direct combustion applications. The
same chips, when transported in a heavy gas oil, take up as much as 50% oil by weight and result in a fuel that is >30% oil
on mass basis and is about two-thirds oil on a thermal basis. Uptake of water by straw during slurry transport is so extreme
that it has effectively no LHV. Pipeline-delivered biomass could be used in processes that do not produce contained water
as a vapor, such as supercritical water gasification. |
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Keywords: | Wood chips pipeline biomass lower heating value straw |
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