Details

Title:

Investigations about the Mixing Process of Char and Bio-oil as Products from the Flash Pyrolysis of Biomass

Author(s):

Nicoleit, T., Erbay, G., Raffelt, K.

Document(s):

Abstract:

The purpose of Karlsruhe’s bioliq®­project is the conversion of biomass into synthetic chemicals and fuels by producing process energy in two steps to achieve a desirable high carbon dioxide reduction. The lignocellulosic biomass is first liquefied by fast pyrolysis in distributed regional plants to produce an energy­dense intermediate composed of a viscous biooil and a high­energy char powder. Both products are mixed to a suspension (the so called bio­slurry or bioliq­ SynCrude®) to be suitable for long storage periods and economic transport over long distances. Afterwards, the biosyncrude is converted into syngas through entrained flow gasifier and then by catalysis to synfuels or platform chemicals. The focus in this study is the mixing process of the bioslurry. Therefore, the char and the liquid phase are mixed by a laboratory scale colloidal mixer (5 litres) to determine the energy consumption during mixing. The investigations are being carried out with a model slurry (suspension of ethylene glycol and char powder) to be adequate with the start­up conditions of the Karlsruhe pilot gasifier test in January 2013. The most influencing parameters in the mixing process are the particle size distribution and the mixed volume, followed by the length of the impeller blade and an additional ring to create extra shear stress on the suspension. It is concluded, that it is more efficient to mix two batches of two litres, than one batch with three litres.

Keywords:

fast pyrolysis, pyrolysis oil, char, feedstock, mixing, biomass to liquid (BtL)

Topic:

R&D on Biomass Conversion Technologies for Heating, Electricity and Chemicals

Subtopic:

Pyrolysis and other biomass liquefaction technologies

Event:

21st European Biomass Conference and Exhibition

Session:

2CV.4.26

Pages:

956 - 961

ISBN:

978-88-89407-53-0

Paper DOI:

10.5071/21stEUBCE2013-2CV.4.26

Price:

FREE