The performance of a loop seal in a CFB boiler
Artikel i vetenskaplig tidskrift, 2006

High in-bed heat transfer and low corrosive environment imply that the loop seal of a circulating fluidized bed (CFB) boiler is an advantageous location for superheaters. In order to increase the knowledge on the flow pattern and the heat transfer distribution to the tubes within a loop seal, measurements were performed in the loop seal of a 30 MW CFB boiler as well as in a 1/3 scaled-down seal operated according to simplified scaling laws. The scale model measurements show that the solids recirculation flux can be maintained with a substantial decrease of the fluidization flow in the seal compared to that currently used at full load conditions. It was also possible to significantly decrease the fraction of the bottom of the seal that was fluidized without affecting the solids flux through the seal. A gradient in the solids flow were detected in the vertical direction.

Författare

A. Johansson

Chalmers University of Technology

Högskolan i Borås

Filip Johnsson

Chalmers, Energi och miljö

Bengt Andersson

Högskolan i Borås

Valmet Power AB

Journal of Energy Resources Technology, Transactions of the ASME

0195-0738 (ISSN) 1528-8994 (eISSN)

Vol. 128 2 135-141

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1115/1.2199567