Investigation of operational parameters for an industrial CFB combustor of coal, biomass and sludge--颗粒学报PARTICUOLOGY

Van de Velden, M., Baeyens, J., Dougan, B., & McMurdo, A. (2007). Investigation of operational parameters for an industrial CFB combustor of coal, biomass and sludge. China Particuology, 5(4), 247–254. https://doi.org/10.1016/j.cpart.2007.05.001

Investigation of operational parameters for an industrial CFB combustor of coal, biomass and sludge

Manon Van de Velden ^a, Jan Baeyens ^a *, Bill Dougan ^b, Alan McMurdo ^b

a Department of Chemical Engineering, University of Birmingham, B15 2TT Birmingham, United Kingdom
b UPM-Kymmene, Caledonian Paper Ltd., Ayr, United Kingdom

10.1016/j.cpart.2007.05.001

Volume 5, Issue 4, August 2007, Pages 247-254

Received 16 January 2007, Accepted 10 May 2007, Available online 17 July 2007.

E-mail: J.Baeyens@bham.ac.uk

Highlights

Abstract

The combustion of coal and/or biomass (sludge, wood waste, RDF, etc.) in a circulating fluidized bed has been a commercial topper for over 20 years, and references to principles and applications are numerous and widespread although few data are presented concerning the operation of large scale CFB-units. The authors studied the CFB-combustion at UPM-Kymmene (Ayr), a major paper mill relying for its steam production upon the combustion of coal (80–85%), wood bark (5–10%) and wastewater treatment sludge (5–10%). The maximum capacity of the CFB is 58 MWth.

A complete diagnostic of the operation was made, and additional tests were performed to assess the operating mode. The plant schematics, relevant dimensions and process data are given. To assess the operation of the UPM-CFB, it is important to review essential design parameters and principles of CFB combustors, which will be discussed in detail to include required data, heat balance and flowrates, operating versus transport velocity, kinetics and conversion (including the possible effect of the Bouduard reaction if carbon is present).

Since the residence time in the riser and the cyclone efficiency determine the burnout of circulating fuel-particles, the UPM-CFB was subjected to a stimulus response technique using nickel oxide as tracer. Results illustrate the efficiency of the cyclone separation and the number of recycle loops for particles of a given size. Results will also be used to assess the cyclone operation and efficiency and to comment upon expected and measured carbon conversion.

Graphical abstract

Keywords

Circulating fluidized bed; Combustion; Coal; Biomass; Operation; Cyclone

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