DYNAMICS OF IN-FURNACE PROCESSES IN A CFB BOILER
Paper in proceedings, 2005

With the aim of understanding the dynamics of combustion, this work examines simultaneous fluctuations in fluid dynamic parameters and gas composition in a CFB furnace operated with coal as a fuel. Fluid dynamic parameters are pressure and air flow to the furnace. Gas composition was obtained by a zirconia-cell probe and a gas suction probe connected to a mass spectrometer having a high time resolution (10 Hz). The fluctuations of interest are around 1 Hz and below 0.3 Hz. The fluctuations below 0.3 Hz, which have not been investigated previously, are found to originate from irregularities in the fuel feed. These irregularities give rise to periods of reducing conditions because high inputs of fuel yield an increased pressure in the furnace and a decreased air feed to the furnace, which then occurs concurrent with the release of a high amount of volatiles. There is also a correlation between reducing conditions and the concentration of hydrocarbons.

zirconia-cell probe

fluidized bed combustion

reducing conditions

mass spectrometer

fluid dynamic parameters

Author

Andreas Johansson

Chalmers, Energy and Environment, Energy Technology

ByungHo Song

Filip Johnsson

Chalmers, Energy and Environment

Lars-Erik Åmand

Chalmers, Energy and Environment, Energy Technology

Bo G Leckner

Chalmers, Energy and Environment, Energy Technology

Proceedings of the 8th International Conference on Circulating Fluidized Beds

159-166

Driving Forces

Sustainable development

Subject Categories

Energy Engineering

Areas of Advance

Energy

Infrastructure

Chalmers Power Central

ISBN

7-5062-7442-6

More information

Created

10/7/2017