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IDENTIFYING ENVIRONMENTALLY PREFERABLE USES FOR BIOMASS

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IDENTIFYING ENVIRONMENTALLY PREFERABLE USES FOR BIOMASS ( identifying-environmentally-preferable-uses-for-biomass )

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BC Bugwood Envirochem Services Inc. 500 m3 per day from an individual operation, or up to more than 3,000 m3 per day from the combined output of all contractors (see Table 3.1.1). The design plant size is therefore 1,000 tonnes per day (250,000 t/yr, assuming 250 work days) – larger than existing pellet plants in BC today (50,000 to 180,000 t/yr). The plant could be operated in three shifts as it is not situated near the logging operation, i.e. the hourly throughput would be about 50 tonnes, or 132 m3. With several energy-consuming units, a pellet plant is a major power consumer. At an hourly input of up to 50 tonnes, 5 MW of power is required to run the plant. Pelletizing consumes 107 kWh per tonne of pellets produced [SLU 2002] (86.7 kWh per tonne of feedstock). Another source [BfE 2001] quotes a lower consumption of 73.7 kWh per tonne of pellets (59.7 kWh per tonne of feedstock), but both sources do not incorporate chipping and debarking material. Debarking and chipping (including conveyors) energy use is given as 38.8 kWh per tonne of feedstock [LBNL 2000], which would result in a total of 98.5 kWh per tonne of feedstock, which was retained for this analysis. Rotary drum dryers are a common type of dryer. The dryer needs to be configured to dry the feedstock from 20% to 10% moisture content. The heat for the dryer will be produced using some of the bark produced (i.e., there is very little fuel cost for drying). For transportation, it is assumed that the wood is transported to the plant by logging truck (capacity: 80 m3 or 30.4 bdt), over an average distance of 150 km. The pellets are transported to the BC customer over a distance of 700 km (one-way), by B-Train pellet trucks (capacity: 44 t or 39.6 bdt). Note that, depending on the customer, a large B-Train may not be able to deliver directly to the point of reception, for example to a small greenhouse in the Lower Mainland. For overseas customers, train transport over 500 km is envisaged, then ship transport out of Vancouver4 over 16,418 km to Europe (8,865 nautical miles to Rotterdam), with an empty Handymax vessel returning to Vancouver. 0.8% energy input (fossil fuel) 2.5% energy loss (drying) 1.8% energy input (fuel & electricity) 1,000 km Rail transport Case 2: 88.5% energy in wood Inputs: 14.5% 1.8% energy input (fossil fuel) 0.4% energy input (fossil fuel) 2.3% energy input (fossil fuel) Biomass Feed 20% moisture Figure 4.1.4 Harvesting Transport to pellet plant Processing 9% Bark residue 700 km Truck transport 16,418 km Ship transport Case 1: 88.5% energy in wood Inputs: 8.8% Case 3: 88.5% energy in wood Inputs: 21.1% Energy Balance of Pellet Plant Options As shown in the energy diagram (Figure 4.1.4), only small losses are incurred by each transport step. The main energy uses are drying and processing. 9% of the energy in the wood is lost as bark residues. Only some of the bark is required to dry the wood to 10% moisture content. The remainder of the bark could be used in another application, such as a biomass power station. Note that the diagram does not account for the energy conversion or use of the pellets. 4 Pellet shipping out of Prince Rupert is no longer possible as the pellet terminal has been dismantled 5.4% energy input (fossil fuel) Page 18

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