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The Effects of Oxygen Enrichment and Fuel Composition on Rotary Kiln Lime Production
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik.
2015 (engelsk)Inngår i: Journal of Engineering Technology, ISSN 0747-9664, Vol. 32, nr 1, s. 30-43Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This article discusses the impact of oxygen (O2) enrichment on rotary kiln lump lime production. A predictive simulation tool is utilized to investigate the effect of O2 enrichment on the following key parameters of the lime process: kiln temperature profile, product quality, specific energy consumption and kiln production capacity. Three fuel mixes - 100% coal, 90% coal and 10% waste derived fuel oil, and 90% coal and 10% sawdust - are simulated at three oxygen levels. The oxygen levels represent three scenarios: no enrichment (21% O2), moderate enrichment (23% O2), and moderate-to-high enrichment (25% O2). This work is a part of the on-going efforts to reduce the environmental impact of industrial production. Reducing emissions, utilizing biofuels and waste derived fuels, full utilization of raw materials, and energy efficiency are areas of importance for industry. In the long term, oxyfuel technology, i.e., combustion with recirculated kiln gases and pure oxygen, could allow for near-zero emission production and carbon sequestration from industry and power production. In the short term, emission reductions in lime production must be achieved through other means, such as energy efficiency. As a step on the path to a near-zero emission lime plant, this paper describes an investigation of the influence of oxygen enrichment in rotary kiln lime production. The simulated results show positive effects of O2 enrichment, and the simulation results have been used by the kiln operator for in-house training. Results indicate that oxygen enrichment applied to lime production can reduce energy consumption and emissions.

sted, utgiver, år, opplag, sider
American Society for Engineering Education , 2015. Vol. 32, nr 1, s. 30-43
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-105273ISI: 000355062900004OAI: oai:DiVA.org:umu-105273DiVA, id: diva2:824359
Tilgjengelig fra: 2015-06-22 Laget: 2015-06-22 Sist oppdatert: 2018-06-07bibliografisk kontrollert
Inngår i avhandling
1. Sustainability measures in quicklime and cement clinker production
Åpne denne publikasjonen i ny fane eller vindu >>Sustainability measures in quicklime and cement clinker production
2015 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis investigates sustainability measures for quicklime and cement clinker production. It is the aim of this thesis to contribute to the effort of creating a more sustainable modus of industrial production.

The methods used comprises process simulations through multicomponent chemical equilibrium calculations, fuel characterization and raw materials characterization through dynamic rate thermogravimetry.

The investigated measures relate to alternative fuels, co-combustion, oxygen enrichment, oxyfuel combustion, mineral carbonation and optimizing raw material mixes based on thermal decomposition characteristics.

The predictive multicomponent chemical equilibrium simulation tool developed has been used to investigate new process designs and combustion concepts. The results show that fuel selection and oxygen enrichment influence energy efficiency, and that oxyfuel combustion and mineral carbonation could allow for considerable emission reductions at low energy penalty, as compared to conventional post-combustion carbon dioxide capture technologies. Dynamic rate thermogravimetry, applied to kiln feed limestone, allows for improved feed analysis with a deeper understanding of how mixing of different feed materials will affect the production processes. The predictive simulation tool has proven to be of practical value when planning and executing production and full scale campaigns, reducing costs related to trial and error.

The main conclusion of this work is that several measures are available to increase the sustainability of the industry.

sted, utgiver, år, opplag, sider
Umeå: Umeå universitet, 2015. s. 82
Emneord
limestone, quicklime, cement clinker, sustainability, oxygen, carbon dioxide, thermal decomposition, dynamic rate thermogravimetry, predictive multicomponent chemical equilibrium calculations, mineral carbonation
HSV kategori
Identifikatorer
urn:nbn:se:umu:diva-112842 (URN)978-91-7601-392-2 (ISBN)
Disputas
2016-01-29, sal N420, Naturvetarhuset, Umeå universitet, Umeå, 13:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2015-12-18 Laget: 2015-12-16 Sist oppdatert: 2018-06-07bibliografisk kontrollert

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