Technology Developments on Oxyfuel Combustion

  • 紀 宗成

Student thesis: Doctoral Thesis

Abstract

Over the past decades the increasing fossil fuel demand for energy production has caused severe pollutant emissions including nitrogen oxides and sulfur oxides which result in acid rain suspended particulate matter bringing serious human health problems and carbon dioxide identified as one of the major greenhouse gases Oxyfuel combustion is a promising technology for carbon dioxide capture and emissions reduction The objectives of this dissertation are to design construct and operate an oxyfuel combustion furnace; demonstrate the feasibility of retrofitting an existing air-fuel furnace to run smoothly under oxyfuel combustion; and investigate the combustion characteristics of oxy-oil and oxy-coal combustion in depth This dissertation outlines the oxyfuel retrofit concept for a 300 kWth multi-fuel combustion test facility The investigation includes heat and mass transfer as well as an analysis of the flue gas emissions (O2 CO2 CO NO and SO2) As a result the first hundred kW scale oxyfuel furnace in Taiwan was successfully constructed An ultra-high purity CO2 (94 1%) was obtained in oxy-coal combustion demonstration; compared with air-coal operation an NO emission reduction of around 66% was obtained under oxy-coal combustion; further the concentration of SO2 in oxy-firing mode was about three times higher than that in air-firing mode Finally it has been verified that transitions from air-firing to oxy-firing could be smoothly achieved under broad operating ranges with stable burning feasibly maintained for various fuel types (oil and coal) and thermal loadings (rated-loading and partial-loading)
Date of Award2015 Jul 15
Original languageEnglish
SupervisorTa-Hui Lin (Supervisor)

Cite this

'