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Article Number 200801, January 2008

A Self-Consistent CFD-model for Pressurised High Temperature Black Liquor Gasification

, M. Marklund¹, R. Tegman² and R. Gebart¹

1 Energy Technology Centre (ETC)
Box 726
SE-941 28 Piteå
Sweden.

2 Chemrec AB
c/o ETC
PO Box 726
SE-941 28 Piteå
Sweden

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ABSTRACT:

High temperature pressurised black liquor gasification has the potential to significantly improve the efficiency of energy and chemical recovery in the pulping industry. However, a lack of demonstration of the reliability of the process has delayed its large scale industrial implementation. As an important step towards a greater trust in the process reliability, a self-consistent CFD model has been developed. This paper contains a detailed description of the model and a performance prediction of an entrained flow pilot gasifier for a typical operational condition. Emphasis is put on the modelling of input data for the CFD simulation where eight key assumptions form the basis for a consistent model of the black liquor composition. The results for the pilot gasifier performance with typical values for the design variables indicate that the droplet size should be <200 ?m and/or have a residence time of 2-3 s for a high level of carbon conversion.

Keywords:

Black liquor, gasification, droplet, CFD, modelling

^* Corresponding Author:

Magnus Marklund

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