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Open AccessArticle

Effect of Coal Blending on Ash Fusibility and Slurryability of Xinjiang Low-Rank Coal

by Hui Li, Xiaoling Song, Gang Li, Lingxue Kong, Huaizhu Li, Jin Bai and Wen Li

Processes 2022, 10(9), 1693; https://doi.org/10.3390/pr10091693 - 26 Aug 2022

Cited by 11 | Viewed by 2088

This work investigated the effect of coal blending on ash fusibility and slurryability of Xinjiang low-rank coal. The results showed that Xinjiang low-rank coals were characterized by high internal water content, high volatile content, high ash fusing point, and poor slurryability, which can not be directly used in coal water slurry gasification. The blending method not only reduced the ash fusibility but also improved the slurryability of these low-rank coals. When the coals with low calcium and high silicon contents (KG and YK) were blended with coal with high calcium content (SH), the ash fusion temperatures of the blended coal were significantly reduced. Moreover, the SH coal showed the worst slurryability performance with a concentration of 48.56%. The slurryability of HS coal can be dramatically improved by blending with KG. When the mass fraction of KG coal reached 70%, the concentration of coal water slurry increased by 11%. For the blended coal of KG and YK, the concentration and stability of coal water slurry gradually increase with the increasing mass ratio of KG. The coal blending method can effectively improve the concentration of coal water slurry for the low-rank coals, which were difficult-to-prepare slurry. Full article

(This article belongs to the Special Issue Chemical Looping Combustion, Gasification and Fuel Conversion Technology)

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11 pages, 234 KB

Open AccessReview

Potential of Coal–Water Slurries as an Alternative Fuel Source during the Transition Period for the Decarbonization of Energy Production: A Review

by Leonel J.R. Nunes

Appl. Sci. 2020, 10(7), 2470; https://doi.org/10.3390/app10072470 - 3 Apr 2020

Cited by 46 | Viewed by 7104

Abstract

Coal–water slurry or coal–water mixture (CWS or CWM) is a complex solid–liquid dispersion. Several research works have been done concerning the production and use of CWSs being developed worldwide in several different governmental, industrial and academic facilities. In the present paper, studies on the developments achieved in the past three decades with regard to the field mentioned above are systematically reviewed, with particular regard to several different aspects during the combustion process. The structure and properties of the coal are highlighted, as are the different additives used and their adaptability with different types of coal, where the particle size distributions are of great importance in determining both the slurryability of coal and the rheological behavior of a produced CWS for its intended characteristics. At a time when there is much debate about the end of the age of coal as a primary source of thermal and electrical energy, alternative forms of use that can contribute to the reduction of pollutant emissions, as well as particles, in the atmosphere offer alternatives that may allow us to continue using coal, at least during this transition period until a viable alternative is found. In-depth knowledge of these coal slurries may allow, in the future, the development of similar products produced from fuels derived from biomass, such as charcoal or torrefied biomass. Full article

(This article belongs to the Special Issue Biomass Energy and Biomass as a Clean Renewable Fuel)

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