Gas emissions from the PFB combustion of solid fuels

Ilkka Hippinen, Yong Lu, Jaana Laatikainen, Matti Nieminen, Antero Jahkola

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Abstract

The emission properties are reported for three solid fuels in pressurised fluidised-bed (PFB) combustion. The work was carried out in Helsinki University of Technology with a 130 kW PFBC test rig. The operating pressure ranged from 0.5 to 1.0 MPa and the operating temperature from 800 to 900-degrees-C. Excess air ranged from 10 to 55%. This paper presents results of sulphur-containing (SO2, SO3), nitrogen-containing (NO, NO2, N2O) and alkali metal vapour emissions, and their dependence on operating parameters. Emissions of nitrogen oxide were dependent primarily on the amounts of combustion air: with reduced air:fuel ratio, the NO(x) emissions fell. Nitrous oxide emissions were effectively reduced with higher reactor temperatures. The extent of sulphur removal depended on the feedstock used, on the Ca:S molar ratio and on the properties of the limestone. Over 90% sulphur capture was reached with bituminous coal by the use of limestone with d50 of 0.23 mm. This paper also presents the results of alkali vapour-phase measurements.
Original languageEnglish
Pages (from-to)154-159
Number of pages6
JournalJournal of the Institute of Energy
Volume65
Issue number465
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

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Hippinen, I., Lu, Y., Laatikainen, J., Nieminen, M., & Jahkola, A. (1992). Gas emissions from the PFB combustion of solid fuels. Journal of the Institute of Energy, 65(465), 154-159.