Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill

Coals used for power plants normally have different ash contents, and the breakage of coals by the ball-and-race mill or roller mill is an energy-intensive process. Grinding phenomena in mill of power plants is complex, and it is also not the same with ideal grinding tests in labs. The interaction a...

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Main Authors:	Jin Duan, Qichang Lu, Zhenyang Zhao, Xin Wang, Yuxin Zhang, Jue Wang, Biao Li, Weining Xie, Xiaolu Sun, Xiangnan Zhu
Format:	Article
Language:	English
Published:	MDPI AG 2020-03-01
Series:	Minerals
Subjects:	grinding behaviors energy consumption characterization sulfur content heterogeneous breakage split energy
Online Access:	https://www.mdpi.com/2075-163X/10/3/230

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spelling	doaj-3cdadc4e963c4571a13db9d7b31746cd2020-11-25T02:39:26ZengMDPI AGMinerals2075-163X2020-03-0110323010.3390/min10030230min10030230Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race MillJin Duan0Qichang Lu1Zhenyang Zhao2Xin Wang3Yuxin Zhang4Jue Wang5Biao Li6Weining Xie7Xiaolu Sun8Xiangnan Zhu9Advanced Analysis & Computation Center, China University of Mining and Technology, Xuzhou 221116, ChinaAdvanced Analysis & Computation Center, China University of Mining and Technology, Xuzhou 221116, ChinaAdvanced Analysis & Computation Center, China University of Mining and Technology, Xuzhou 221116, ChinaAdvanced Analysis & Computation Center, China University of Mining and Technology, Xuzhou 221116, ChinaAdvanced Analysis & Computation Center, China University of Mining and Technology, Xuzhou 221116, ChinaAdvanced Analysis & Computation Center, China University of Mining and Technology, Xuzhou 221116, ChinaMining and Minerals Engineering Department, Virginia Tech, Blacksburg, VA 24060, USAAdvanced Analysis & Computation Center, China University of Mining & Technology, Xuzhou 221116, ChinaSchool of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, ChinaSchool of Chemical & Environmental Engineering, Shandong University of Science & Technology, Qingdao 266590, ChinaCoals used for power plants normally have different ash contents, and the breakage of coals by the ball-and-race mill or roller mill is an energy-intensive process. Grinding phenomena in mill of power plants is complex, and it is also not the same with ideal grinding tests in labs. The interaction among various coals would result in changes of grinding behaviors and energy consumption characterization if compared with those of single breakage. In this study, anthracite and bituminous coal of different ash contents were selected to be heterogeneously ground. Quantitation of components in products was realized using the relation between sulfur content of the mixture and mass yield of one component in the mixture. Product fineness t<sub>10</sub> of the component was determined, and split energy was calculated on the premise of specific energy balance and energy-size reduction model by a genetic algorithm. Experimental results indicate that breakage rate and product fineness t<sub>10</sub> of the mixture decrease with the increase of hard anthracite content in the mixture. Unlike the single breakage, <i>t</i><sub>10</sub> of anthracite in heterogeneous grinding is improved dramatically, and bituminous coal shows the opposite trend. The interaction between components results in the decrease of the specific energy of the mixture if compared with the mass average one of components in single breakage. Breakage resistance of hard anthracite decreases due to the addition of soft bituminous coal, and grinding energy efficiency of anthracite is also improved compared with that of single grinding.https://www.mdpi.com/2075-163X/10/3/230grinding behaviorsenergy consumption characterizationsulfur contentheterogeneous breakagesplit energy
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Jin Duan Qichang Lu Zhenyang Zhao Xin Wang Yuxin Zhang Jue Wang Biao Li Weining Xie Xiaolu Sun Xiangnan Zhu
spellingShingle	Jin Duan Qichang Lu Zhenyang Zhao Xin Wang Yuxin Zhang Jue Wang Biao Li Weining Xie Xiaolu Sun Xiangnan Zhu Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill Minerals grinding behaviors energy consumption characterization sulfur content heterogeneous breakage split energy
author_facet	Jin Duan Qichang Lu Zhenyang Zhao Xin Wang Yuxin Zhang Jue Wang Biao Li Weining Xie Xiaolu Sun Xiangnan Zhu
author_sort	Jin Duan
title	Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill
title_short	Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill
title_full	Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill
title_fullStr	Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill
title_full_unstemmed	Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill
title_sort	grinding behaviors of components in heterogeneous breakage of coals of different ash contents in a ball-and-race mill
publisher	MDPI AG
series	Minerals
issn	2075-163X
publishDate	2020-03-01
description	Coals used for power plants normally have different ash contents, and the breakage of coals by the ball-and-race mill or roller mill is an energy-intensive process. Grinding phenomena in mill of power plants is complex, and it is also not the same with ideal grinding tests in labs. The interaction among various coals would result in changes of grinding behaviors and energy consumption characterization if compared with those of single breakage. In this study, anthracite and bituminous coal of different ash contents were selected to be heterogeneously ground. Quantitation of components in products was realized using the relation between sulfur content of the mixture and mass yield of one component in the mixture. Product fineness t<sub>10</sub> of the component was determined, and split energy was calculated on the premise of specific energy balance and energy-size reduction model by a genetic algorithm. Experimental results indicate that breakage rate and product fineness t<sub>10</sub> of the mixture decrease with the increase of hard anthracite content in the mixture. Unlike the single breakage, <i>t</i><sub>10</sub> of anthracite in heterogeneous grinding is improved dramatically, and bituminous coal shows the opposite trend. The interaction between components results in the decrease of the specific energy of the mixture if compared with the mass average one of components in single breakage. Breakage resistance of hard anthracite decreases due to the addition of soft bituminous coal, and grinding energy efficiency of anthracite is also improved compared with that of single grinding.
topic	grinding behaviors energy consumption characterization sulfur content heterogeneous breakage split energy
url	https://www.mdpi.com/2075-163X/10/3/230
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Grinding Behaviors of Components in Heterogeneous Breakage of Coals of Different Ash Contents in a Ball-and-Race Mill

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