Effect of coal and air staging on the ignition plane movement and emissions during rapid large load changes on chain-grate stokers

Z S Chong; Steven Wilcox; J Ward

doi:10.1179/174602205X41963

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Effect of coal and air staging on the ignition plane movement and emissions during rapid large load changes on chain-grate stokers

Journal article

Peer reviewed

Effect of coal and air staging on the ignition plane movement and emissions during rapid large load changes on chain-grate stokers

Z S Chong, Steven Wilcox and J Ward

Journal of the Energy Institute, Vol.78(2), pp.90-97

2005

DOI: https://doi.org/10.1179/174602205X41963

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Abstract

Aid/fuel staging

Chain-grate stokers

Flame-front monitoring

Ignition-plane stability

Lump-coal combustion

Lump coal

Transient carbon monooxide emissions

A major concern when operating stoker-fired boiler plant during rapid large load changes is maintaining stable ignition because 'burn-back' may occur or, at the other extreme, burning coal can be discharged from the end of the grate if the coal and air settings are not appropriately controlled. A suitable coal/air staging practice has been identified for chain-grate, stoker-fired boilers under rapid load-following conditions. The flame-front migration and carbon monoxide and oxygen concentrations in the flue gases were recorded during experiments on a test facility at Casella CRE. The findings were confirmed in tests on a full-scale industrial boiler and indicate that the coal feed should lead the air flow on load increase and vice versa on turndown in order to improve transient ignition stability and reduce carbon monoxide and smoke emissions.

Details

Title: Effect of coal and air staging on the ignition plane movement and emissions during rapid large load changes on chain-grate stokers
Authors: Z S Chong (Author) - University of Glamorgan
Steven Wilcox (Author) - University of Glamorgan
J Ward (Author) - University of Glamorgan
Publication details: Journal of the Energy Institute, Vol.78(2), pp.90-97
Publisher: Taylor & Francis
Date published: 2005
DOI: 10.1179/174602205X41963
ISSN: 1746-0220; 1743-9671
Organisation Unit: Office of the Deputy Vice-Chancellor (Academic); University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99513907202621
Output Type: Journal article

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