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  • Studies on the release of volatile mineral matter species during the high temperature, rapid heating of pulverized fuel under conditions relevant to low NO(x) burners

Abstract

Ash deposits within pulverized coal-fired boilers, derived from the mineral matter in the coal, cause loss of boiler efficiency and if allowed to develop, may require expensive outages for their removal. It is important to know how coal properties and boiler conditions affect ash deposition. Low NO(x) burners are being fitted to European coal-fired power stations in order to reduce the emissions of nitrogen oxides. During the early states of combustion within these burners, oxygen concentrations and temperatures tend to be lower than in conventional burners and this may affect ash deposition. One of the key factors affecting ash deposition is the sodium in the coal. Some of the sodium volatilizes in the flame and reacts with other flame components to form species which condense on the heat transfer surfaces of the boiler or the surface of the fly ash particles and act as a precursor to ash deposition. It is possible that the extent of release and form of the volatile sodium is not the same in low NO(x) burners as it is in conventional burners. The aim of this project was to compare, under laboratory conditions, the release of sodium from pulverized coal particles under conditions pertaining to low NO(x) and conventional burners.

Additional information

Authors: BRITISH COAL CORPORATION, British Coal Corporation, Gloucester (GB)
Bibliographic Reference: EUR 15200 EN (1996) 122pp., FS, ECU 13.50
Availability: Available from the (2)
ISBN: ISBN 92-823-0904-5
Record Number: 199710091 / Last updated on: 1997-04-01
Category: PUBLICATION
Original language: en
Available languages: en
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