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• W2284852400 abstract "Computer models were developed to quantify the energy demand in a sawmill and a medium density fibreboard (MDF) plant, based on the production processes. For the sawmill, an empirical model was developed using mill data collected from a local sawmill near Christchurch. The model requires further practical data from more sawmills for validation. For the MDF plant, thermal energy demand was theoretically calculated and electricity demand was simulated empirically based on an energy audit. The MDF energy demand model was validated by plant data and the results showed a satisfactory accuracy with the discrepancies being -5% to 7% for the thermal energy prediction and ±4% for the electricity prediction. With the inputs of product production and grade, the models are able to predict the energy demand, the log volume required, the wood residues generated and the energy self-sufficiency. The wood residues generated are usually be able to provide more than enough energy to meet demand including heat and electricity in a sawmill, but only 80-90% of the thermal energy demand in an MDF plant. The difference is due to the much lower energy demand in a sawmill. Introduction The wood processing industry consumes a large amount of energy in the forms of electricity and heat. The latest survey showed that in 2002 the New Zealand wood processing industry consumed 69 PJ of primary energy. Of the energy consumed, 53% (36.6 PJ) was derived from woody biomass including wood processing residues and black liquor generated within the industry. The majority of the energy derived from the woody biomass is heat and only a small proportion of electricity (20%) consumed in the wood processing sector is generated from the woody biomass cogeneration plants (Gifford and Anderson 2003). A research programme being undertaken at the University of Canterbury aims at establishing a biomass integrated gasification combined cycle (BIGCC) system for generation of electricity and thermal energy using the woody biomass from both the wood processing and forests (Pang and Li 2006). The energy generated can be supplied back to the wood processing industry to improve the energy self-sufficiency, especially in the form of electricity. The objectives of the work presented in this paper are to construct energy demand models for a sawmill and an MDF plant. The models are able to predict energy consumption, the ratio of electricity to thermal energy, the amount of wood residues generated and the energy self-sufficiency in a particular wood processing plant. Ultimately, the models will be integrated into a biomass energy system model for feasibility studies which will determine the optimum size and location for construction of a commercial BIGCC bioenergy plant. Modelling of energy demand in a sawmill The primary product from a sawmill is kiln-dried sawn timber but there are also byproducts in the form of bark, wood chips, sawdust and off cuts. These byproducts, or wood processing residues have a sale value and are also a potential onsite fuel source for a BIGCC bioenergy plant. A sawmill usually consists of four main unit operations including log debarking, timber sawing, side-cuts chipping and timber drying. The operations all consume energy in the form of electricity while the drying operation also consumes thermal energy (heat). Therefore the operation as a whole in the sawmill consumes both heat and electricity. * Department of Chemical and Process Engineering, University of Canterbury. jingge.li@canterbury.ac.nz The energy demand model for the sawmill was developed using mass and energy balances based on the production line in a local sawmill near Christchurch. The sawmill is relatively new and comprises a modern automated sawing operation and new timber drying kilns using the ACT (accelerated conventional temperature) drying schedule." @default.
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• W2284852400 date "2006-01-01" @default.
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• W2284852400 title "Energy demand in wood processing plants" @default.
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