Development and study of A conical fluidized-bed combustor firing biomass fuels

Name: Watchara Permchart

Organization : King Mongkut's University of Technology Thonburi. The Joint Graduate School of Energy and Environment. Energy Technology

keyword: Conical bed

; Fluidized-bed combustion

; การเผาไหม้แบบฟลูอิไดซ์เบด

Abstract: The dissertation summarizes the results of the experimental study on combustion ofthree distinct biomass fuels (namely, sawdust, rice husk and pre-dried sugar cane bagasse)in a fluidized-bed combustor with a conical bed (referred to as the conical FBC) usingsilica sand as the inert bed material. In the study, the effects of fuel analysis and operatingconditions (fuel feed rate, excess air and bed height) on the combustion processes in theconical FBC are investigated. In the tests, the temperatures as well as the concentrations ofCO, NO, C02 and 0 2 along the combustor height and in the flue (stack) gas are measured.The results have shown that the axial temperature profiles in the conical FBC arefairly uniform for all the fuels and weakly affected by fuel analysis and excess air. BothCO and NO axial profiles are found to have a maximum whose location dividesconventionally the combustor volume into formation (lower) and reduction (upper) zonesfor these pollutants. Furthermore, fuel quality, excess air and fuel feed rate are found tohave strong influences on combustion processes in the conical FBC, meanwhile the bedheight is found to have a minor effect. Based on the analyses of heat losses owing toincomplete combustion and unburned carbon, the combustion efficiencies of the conicalFBC are determined for the selected biomass fuels fired under different operatingconditions. They are found to be in the ranges of 96.5-99.8%, 81.3-86.3% and96.3-99.4% when firing regular sawdust, rice husk and pre-dried sugar cane bagasse,respectively, for wide ranges of operating variables.

King Mongkut's University Technology Thonburi. Library

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: Kouprianov, Vladimir

Role: Advisor

Created: 2003

Issued: 2007-07-12

Modified: 2007-07-26

วิทยานิพนธ์/Thesis

ISBN: 9744565187

CallNumber: JGSEE40

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Energy Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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