TAILIEUCHUNG - Progress in Biomass and Bioenergy Production Part 13

Tham khảo tài liệu 'progress in biomass and bioenergy production part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Activated Carbon from Waste Biomass 349 Binder Pyrolysis oil Char Binder ratio Pressing temperature Pressure bar Force N Coconut press residue 1 cold 250 350 200 C 200 Wheat straw 1 200 C 200 205 Table 7. Break strength of pellets made from olive stone char. Bold best combinations. The stability of the pellets was not only influenced by the type of binder but as well by the type of biomass. Pellets from olive stone chars were very hard to form due to the melting effects after pressing. Stable pellets could only be attained by the use of wheat straw tar as binder. 4. Rotary kiln reactor for char activation The advantage of the lab-scale pyrolysis and activation facilities is the easy way of handling and the short heat-up times. Many experiments can be made in a short time interval. Unfortunately the possibility of treating larger amounts of biomass is not given. Likewise these facilities do not serve for an up-scale to an industrial production process neither for biomass pyrolysis nor for char activation. For this a new concept of an activated carbon production process had to be worked out. For the pyrolysis step an already existing screw driven rotary kiln reactor Hornung et al. 2005 Hornung Seifert 2006 was used to transfer the lab-scale experiments into a continuous production process. Unfortunately the pyrolysis temperature was limited to 500 C within this reactor. Tests were run with wheat straw pellets olive stones coconut press residues rape seeds and spent grain. The chars were activated in the lab-scale facility. No influence of the chars from lab-scale experiments and rotary kiln pyrolysis was found after the activation step. The surface area of the chars from rotary kiln pyrolysis was similar to the area of the chars from lab-scale pyrolysis. The mass loss during activation was higher when the rotary kiln chars were used due to the lower pyrolysis temperature of 450 C-500 C. The lab-scale pyrolysis was run at 600 C. For this at lot

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