Dynamics of furnace processes in a CFB boiler
Artikel i vetenskaplig tidskrift, 2007

With the aim of understanding the dynamics of combustion, this work examines simultaneous fluctuations in fluid dynamic parameters and gas composition measured in a CFB furnace operated with coal as a fuel. The fluid dynamic parameters investigated are pressure and air flow entering the furnace. Gas composition was recorded by a zirconia-cell probe and a gas suction probe connected to a mass spectrometer having a high time resolution (10 Hz). The principal fluctuations detected are around I Hz and below 0.3 Hz. The fluctuations below 0.3 Hz mostly originate from variations in the fuel-feed rate. These variations create periods of reducing conditions caused by a momentarily high fuel input accompanied by a pressure rise in the furnace and a reduction of the air feed, which occurs concurrent with the release of an enhanced quantity of volatiles. Modelled pressure fluctuations based on the relation between volatile release and pressure in the furnace give similar pressure fluctuations as the measured pressure fluctuations, with respect to amplitude and characteristic time scale of the fluctuations. There is also a correlation between reducing conditions and the concentration of hydrocarbons. (c) 2006 Elsevier Ltd. All rights reserved.

SYSTEM

hydrodynamics

circulating fluidized bed

fluidization

FLUIDIZED-BED

BITUMINOUS COAL

PRESSURE-FLUCTUATIONS

REGIMES

dynamics

gas composition

DEVOLATILISATION

combustion

TIME

Författare

A. Johansson

Chalmers University of Technology

Högskolan i Borås

Filip Johnsson

Chalmers, Energi och miljö

Fredrik Niklasson

Chalmers, Energi och miljö

Lars-Erik Åmand

Chalmers University of Technology

Chemical Engineering Sciences

0009-2509 (ISSN)

Vol. 62 550-560

Ämneskategorier

Övrig annan teknik

DOI

10.1016/j.ces.2006.09.020