THERMAL SCIENCE

International Scientific Journal

AGGLOMERATION OF BED MATERIAL: INFLUENCE ON EFFICIENCY OF BIOFUEL FLUIDIZED BED BOILER

ABSTRACT
The successful design and operation of a fluidized bed combustor requires the ability to control and mitigate ash-related problems. The main ash-related problem of biomass filing boiler is agglomeration. The fluidized bed boiler with steam capacity of 66 t/h (4 MPa, 440 °C) was started up at the Arkhangelsk Paper-Pi dp-Plant in 2001. This boiler was manufactured by the Russian companies "Energosofin" and "Belenergomash" and installed instead of the existing boiler with mechanical grate. Some constructional elements and steam drum of existing boiler remained unchanged. The primary air fan was installed past the common air fan, which supply part of the air into 24 secondary airports. First operating period shows that the bed material is expanded and then operator should increase the primary air rate, and the boiler efficiency dramatically decreases. Tills paper presents some results of our investigations of fuel, bed and fly ash chemical compositions and other characteristics. Special experiments were carried out to optimize the bed drain flow rate. The influence of secondly air supply improvement on mixing with the main flow and boiler efficiency are given.
KEYWORDS
PAPER SUBMITTED: 2003-02-20
PAPER REVISED: 2003-03-27
PAPER ACCEPTED: 2003-03-28
DOI REFERENCE: https://doi.org/10.2298/TSCI0301005R
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2003, VOLUME 7, ISSUE 1, PAGES [5 - 16]
REFERENCES
  1. Lin W., Dam-Johansen K., "Agglomeration in Fluidized Bed Combustion; Biomass-Mechanisms and Co-firing with Coal", 15th Int. Conf. of Fluidized Bed Combustion, May 16-19, 1999, Savannah, USA.
  2. Grubor B. G., Oka S. N., Ilic M. S., et al., "Biomass FBC Combustion - Bed Agglomeration Problems, Proc. of 13th Conf on Fluid. Comb., V1, p515-522, May 7-10, Orlando,Florida,1995.
  3. Kifroboe L., 1987. in Proc. Symp. Swedish Flame Days, September, 8, Goteborg, Sweden.
  4. Ryabov G. A., Folomeev O.M., Molchanov V. A. and Khritinin A. F. , "Profile of secondary air stream in CFB model", Proc. of 7th Int. Conf. on CFB, Niagara Falls, Ontario, Canada, 2002.

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence