Manual heating, thermal cutting and gouging

Thermal combustion and oxygen chemisorption of wood exposed to low temperature long term heating 1

... during initial period of wood drying Model Model o Temperature ( C) 58 54 50 46 1. 00 1. 01 1.03 1. 04 1. 05 1. 06 1. 08 1. 09 1. 10 1. 12 Distance from centre (mm) (Graph taken from Zhang and Datta (2004), ... self -heating of wood chars 1. 3 Scope of work Taking into consideration of the above objectives, the focus of this thesis is on thermal combustion a...

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Thermal combustion and oxygen chemisorption of wood exposed to low temperature long term heating 2

... primary wood degradation mechanisms of such description is based on Shafizadeh and Chin (1977) work which expresses the decomposition as k1 WOOD → TAR (2. 22) k2 WOOD → GAS (2. 23) k3 WOOD → CHAR (2. 24) ... exp(− K / Ts ) pv , sat where K1 and (2. 8) K are constants which depend on the temperature range, and K1 4.143 ×1010 Pa and K = 4 822 K in the temperature range of...

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Thermal combustion and oxygen chemisorption of wood exposed to low temperature long term heating 3

... and erratic velocity profile   S-curve temperature profile  COUPLED VELOCITY AND TEMPERATURE DEVELOPMENT IN SELF -HEATING Figure 3. 1: Salient features of porous models for low- temperature long- term ... a factor of has been applied onto the porosity of green wood to derive the porosity of preburn wood, since pre-burn wood in this study has a 50% degree of...

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Thermal combustion and oxygen chemisorption of wood exposed to low temperature long term heating 4

... λ s λ (4. 47) Substituting Equations (4. 46) and (4. 47) into Equation (4. 45) yields C1 as C1 = Substituting Equation (4. 48) and H =  ′′ qe (4. 48)  s  + h s k  λ  h into Equation (4. 46), then ... 10 644 6 24 640 640 636 6 24 708 652 628 6 64 External heat flux &e q′′ (kW m-2) 50a 40 a 30a 25a 20a 15b 11c 10c 9c 8c Time to ignition tig (hr:min:s) 0:0:26 0:0: 54 0:1 :48 0:...

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Thermal combustion and oxygen chemisorption of wood exposed to low temperature long term heating 5

... a ratio of 1:100 (see Figures 5. 5 and 5. 6.) Discs 12.7 mm diameter and mm thick (see Figures 5. 7 and 5. 8) were pressed in a vacuum KBr press (Perkin-Elmer) at 100,000 psi Figure 5. 5 Wood samples ... grinding the wood discs sliced from the wood blocks and sieved to the desired particle size of 200 to 300 μm The wood powders were stored at 50 %RH at 23°C in a...

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Thermal combustion and oxygen chemisorption of wood exposed to low temperature long term heating 6

... 6. 2 Heat and mass transfer in porous slab Self -heating and spontaneous combustion of wood was studied using wood cube of critical size exposed to low- temperature, long- term heating in an isothermal ... 25 20 15 11 10 26 54 108 324 764 3222 7990 7554 463 .01 465 .70 431. 06 4 36. 06 402. 16 367 .60 315. 26 298.38 266 .5 373.4 374.9 375.9 373.9 460 .5 345.4 3...

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Thermal combustion and oxygen chemisorption of wood exposed to low temperature long term heating 7

... the body of knowledge on thermal combustion and oxygen chemisorption of wood in the following areas: evaporation, liquid water transport, role of moisture in thermal combustion and oxygen chemisorption ... addition to thermophysical approach to examine self -heating and spontaneous combustion of low- temperature, long- term preheated wood, targeted...

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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 1 pptx

... organisms as feed for the developing larvae The aim of the present manual was therefore to review and summarise the latest developments concerning the production and use of the major live food organisms ... also the production and use of live food organisms as feed for the developing larvae The present manual describes the major product...