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Appl. Sci. 2016, 6(11), 347; doi:10.3390/app6110347

Oxygen Carrier Aided Combustion (OCAC) of Wood Chips in a Semi-Commercial Circulating Fluidized Bed Boiler Using Manganese Ore as Bed Material

Department of Energy and Environment, Chalmers University of Technology, Gothenburg SE-412 96, Sweden
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Academic Editor: Johannes Kiefer
Received: 26 September 2016 / Revised: 31 October 2016 / Accepted: 1 November 2016 / Published: 12 November 2016
(This article belongs to the Section Energy)
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Abstract

Oxygen Carrier Aided Combustion (OCAC) is realized by using an active oxygen-carrying bed material in fluidized bed boilers. The active material is reduced in fuel rich parts of the boiler and oxidized in air rich parts. Advantages could be achieved such as new mechanisms for oxygen transport in space and time. Here calcined manganese ore has been used as active bed material in a 12 MWth circulating fluidized bed boiler. The fuel was wood chips and the campaign lasted more than two weeks. From an operational point of view, manganese ore worked excellently. From the temperature profile of the boiler it can be concluded that fuel conversion was facilitated, especially in the dense bottom bed. The effect did not always translate to reduced emissions, which suggests that final combustion in the cyclone outlet was also influenced. Substituting 10% of the sand bed with manganese ore made it possible to reduce the air to fuel ratio without generating large amounts of CO. The use of 100% manganese ore resulted in higher emissions of CO than the sand reference, but, when combined sulphur feeding, dramatic reductions in CO emissions, up to 90% compared to sand reference, was achieved. View Full-Text
Keywords: Oxygen Carrier Aided Combustion; Chemical-Looping Combustion; fluidized bed combustion; biomass; bio energy; manganese ore Oxygen Carrier Aided Combustion; Chemical-Looping Combustion; fluidized bed combustion; biomass; bio energy; manganese ore
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Rydén, M.; Hanning, M.; Corcoran, A.; Lind, F. Oxygen Carrier Aided Combustion (OCAC) of Wood Chips in a Semi-Commercial Circulating Fluidized Bed Boiler Using Manganese Ore as Bed Material. Appl. Sci. 2016, 6, 347.

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