Oxyfuel combustion in rotary kiln lime production

Abstract

The purpose of this article is to study the impact of oxyfuel combustion applied to a rotary kiln producing lime. Aspects of interest are product quality, energy efficiency, stack gas composition, carbon dioxide emissions, and possible benefits related to carbon dioxide capture. The method used is based on multicomponent chemical equilibrium calculations to predict process conditions. A generic model of a rotary kiln for lime production was validated against operational data and literature. This predicting simulation tool is used to calculate chemical compositions for different recirculation cases. The results show that an oxyfuel process could produce a high‐quality lime product. The new process would operate at a lower specific energy consumption thus having also a reduced specific carbon dioxide emission per ton of product ratio. Through some processing, the stack gas from the new process could be suitable for carbon dioxide transport and storage or utilization. The main conclusion of this paper is that lime production with an oxyfuel process is feasible but still needs further study.

Thermodynamic data for cement clinkering

“…shows the conventional CO 2 pressure in the kiln (10%v or 0.1 atm); the CO pressure is normally at or above this isobar. The curvature of the field boundaries shows the upper temperature limit of stability of spurrite which is enhanced in CO 2 -rich atmospheres as may occur in as oxyfuel combustion [64,65] which typically generate atmospheres rich in CO 2 .…”

Strategies for Carbon Dioxide Utilization in Highly Volatile Industrial Transformation Pathways

“…In western Europe, most of the WIP and lime production plants are already equipped with a gas cleaning unit to meet the emission limits specified in environmental regulations. Therefore, highly pure CO 2 can be obtained through post-combustion capture [11]. thyssenkrupp Uhde operates a transportable pilot-plant for CO 2 capture, which can be connected to different industrial CO 2 point sources, such as the steel mill in Duisburg, to investigate the CO 2 capture process under real industrial conditions (Fig.…”

“…et al[7]; b) Qu et al[8]; c) The FINEX Process[9]; d) personal communication Lhoist; e) Voldsund et al[10]; f) Erikson et al[11]; g) Haaf et al[12].…”

The Carbon Dioxide Emissions Reduction Potential of Carbon-Dioxide-Cured Alternative Binder Concrete

“…Waste CO2 was available at the flue gas of the on-site lime kiln at the Raahe steel mill [76]. However, the CO2 concentration of the lime kiln flue gas is assumed to be approximately 40 wt.% ( [77]; first combustion with no re-circulation). Thus, 2.5 times the CO2containing gas is needed for the completion of the process in comparison to 99.8% of pure CO2 [78] from Porvoo.…”