Production of high quality torrefied wood pellets with minimum energy consumption
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1 Production of high quality torrefied wood pellets with minimum energy consumption Is it better to do torrefaction before or after pelletisation? Bahman Ghiasi, Shahab Sokhansanj, Jim Lim, Linoj Kumar
2 Outline of the presentation Why torrefied biomass? Why to densify torrefied biomass? How to combine densification and torrefaction to make high quality torrefied pellets? Comparison of two different process pathways Detailed energy and mass balance Comparison of the wood pellet properties Take home messages
3 Torrefaction improve the biomass properties to be used as an energy/chemical commodity Can be co-fired efficiently with coal Torrefaction can enhance the calorific value closer to coal Torrefied particles are brittle Easy to grind with less energy consumption Improves biomass properties for other applications Torrefied biomass based bio-oil is less acidic and more stable compared to the raw biomass Higher carbon content can lead to a better quality syngas production Easy to store Torrefaction can enhance the hydrophobic properties of biomass, can be stored even in an open environment Produce homogenous fuel Upgrade low quality residues and wastes
4 Torrefied biomass currently has some limitations Density of torrefied biomass is lower and challenging to transport economically over long distances Need to be densified for the tradability as an energy commodity Hard to bind during densifica1on
5 Why to densify torrefied biomass? Increase in bulk density Better flowability characteristics feeding to reactors Predictable quality and thermal performance But torrefied biomass particles should be densified With minimum energy consumption The resulting pellets must be stable and durable Must maintain the higher properties of torrefied biomass (high energy value, less susceptible to moisture ingress and mechanical damage)
6 How to make torrefied pellets? Can we densify torrefied biomass? Torrefied biomass is not easy to bind as the raw biomass particles High energy or the use of binder seems to be required to densify the torrefied biomass Alternatively, can we torrefy densified biomass? Can we maintain the physical compaction of the pellets if we torrefy them? Can pellets be torrefied as effective as wood chips?
7 One possible solution to making Torrefied pellets A. Pelletization Before Tarrefaction (PBT) B. Pelletization After Torrefaction (PAT) A B Which is better?
8 Process instruments used for the work Drying unit Hammer mill grinding unit Pelletisation unit Torrefaction unit (BTGA)
9 Grinding of raw wood chips vs. torrefied wood chips Comparison
10 rinding of torrefied wood chips was easier compared o grinding wood chips 5 6 times less energy for grinding torrefied wood chips
11 Grinding torrrefied material produce more fines!
12 Pelletizing of raw biomass vs. torrefied biomass Comparison
13 Pelletisation of torrefied material was energy intensive, but use of binder minimised the energy consumption 2000 Opera1ng Power [W] Raw biomass Torrefied biomass with the use of binder Opera1ng Time [sec]
14 Torrefaction of raw biomass vs. pellets Torrefaction
15 Torrefaction of woodchips and regular wood pellets are fairly similar Mass loss-wood chips Mass loss - pellets temperature Mass (g) Temperature (oc) Time (s)
16 verall energy/mass balance Pathway I (PelleJzaJon before torrefacjon) Unit energy Ini1al Consumed required KJ/Kg mass (Kg) energy kj Drying Grinding Pelle1za1on Torrefac1on Total Pathway II (PelleJzaJon arer torrefacjon) Unit energy Ini1al Consumed required KJ/Kg mass (Kg) energy kj Drying Torrefac1on Grinding Pelle1za1on Total
17 Hydrophobicity of pellets: Immersing pellets in water A. PelleJzed and torrefied B. Torrefied and pellejzed
18 Physical properties of pellets made from untreated and torrefied wood chips Pellet type MC (%) ParJcle density (g/cm 3 ) High heat value (MJ/kg) Durability DURAL (% ) Pellets made from untreated wood chips Regular white pellets torrefied at 260 o C Pellets made from torrefied woodchips mixed with 7% wheat flour binder, Temp 260 o C
19 Chemical composition of the pellets made from the two pathways Biomass and treatments Carbon (%) Hydrogen (%) Glucan (Celulose) (%) Hemicellu- loses (%) Acid insoluble lignin/resi- due Untreated wood chips (0.8) 21.5 (0.4) 31.7 (0.4) Untreated wood pellets (0.6) 21.1 (0.3) 32.3 (0.7) PelleJsed and then torrefied (1.0) 6.2 (0.2) 43.3 (0.2) Torrefied and then pellejxed (1.4) 5.2 (0.2) 38.3 (0.5)
20 Application of pathway 1 for agri-biomass torrefied pellet production There are several concerns regarding densification of agricultural biomass Agri biomass has less bulk density and need more compression for pelletization Some agri biomass coated with waxy materials that prevent proper pelletization Conditioned ground agri-biomass loss moisture faster than the woody biomass
21 Torrefied Agri-Biomass pellet samples at 260oC for 15 minutes Switch grass Corn Stover Miscanthus Wheat straw
22 Densification of raw material production of denser pellet Effect of pretreatment 1. Steam explosion pretreatment 2. Effect of die thickness on pellet density 3. Effect of size distribution on pellet density
23 Steam explosion of raw materials Denser pellet Durable pellet Reduce the energy require for grinding Lowers energy required for densification Faster drying
24 Douglas fir and Switch grass pellet quality in different stages SAMPLE Torrefied steam treated D F pellet Torrefied steam treated SG pellet Torrefied D F pellet Torrefied SG pellet steam treated D F pellet steam treated SG pellet SG pellet DF pellet HHV MG/Kg DENSITY g/cm3 Durability
25 Effect of die thickness on pellet density Effect of L/D of die on compression of the materials 1. Densification of woody biomass 2. Densification of agri-biomass Expanded surface are for more friction 1. Increase surface temperature 2. Increase moisture content drop 3. Help lignin replacement properly
26 Key conclusions It was very difficult to bind the torrefied material with reasonable energy consumption The use of binder minimized the energy required for pelletizing torrefied wood chips Alternatively, torrefied pellets can be made from torrefying regular wood pellets with reasonable energy consumption. The resulting torrefied pellets had many promising properties (Enhanced energy value, higher hydrophobicity, higher carbon content etc.) Pretreatment prior to densificacion can help to produce more denser pellet for torrefaction.
27 Thank you! Questions?
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