Fluidization with hot compressed water in micro-reactors

Share/Save/Bookmark

Potic, B. and Kersten, S.R.A. and Ye, M. and Hoef van der, M.A. and Kuipers, J.A.M. and Swaaij van, W.P.M. (2005) Fluidization with hot compressed water in micro-reactors. Chemical Engineering Science, 60 (22). pp. 5982-5990. ISSN 0009-2509

[img]PDF
Restricted to UT campus only
: Request a copy
342Kb
Abstract:In this paper the concept of micro-fluidized beds is introduced. A cylindrical quartz reactor with an internal diameter of only 1 mm is used for process conditions up to Click to view the MathML source and 244 bar. In this way, fast, safe, and inherently cheap experimentation is provided. The process that prompted the present work on miniaturization is gasification of biomass and waste streams in hot compressed water (SCWG). Therefore, water is used as fluidizing agent. Properties of the micro-fluid bed such as the minimum fluidization velocity (Umf), the minimum bubbling velocity (Umb), bed expansion, and identification of the fluidization regime are investigated by visual inspection. It is shown that the micro-fluid bed requires a minimum of twelve particles per reactor diameter in order to mimic homogeneous fluidization at large scale. It is not possible to create bubbling fluidization in the cylindrical micro-fluid beds used. Instead, slugging fluidization is observed for aggregative conditions. Conical shaped micro-reactors are proposed for improved simulation of the bubbling regime. Measured values of Umf and Umb are compared with predictions of dedicated 2D and 3D discrete particle models (DPM) and (semi)-empirical relations. The agreement between the measurements and the model predictions is good and the model supports the concept and development of micro-fluid beds.
Item Type:Article
Copyright:© 2005 Elsevier Ltd
Faculty:
Science and Technology (TNW)
Research Group:
Link to this item:http://purl.utwente.nl/publications/52760
Official URL:http://dx.doi.org/10.1016/j.ces.2005.04.047
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page

Metis ID: 224488