Modeling of the Thermal Efficiency of a Whole Cement Clinker Calcination System and Its Application on a 5000 MT/D Production Line

Yanfei Yao, Songxiong Ding and Yanxin Chen
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Yanfei Yao: College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Songxiong Ding: Department of Civil Engineering, University of Agder, 4879 Grimstad, Norway
Yanxin Chen: College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

Energies, 2020, vol. 13, issue 20, 1-16

Abstract: This paper proposes that the scope of research should be extended to the whole clinker calcination system from its single device or specific process (i.e., its functional subunits) as conventionally conducted. Mass/heat flow and effective heat were first analyzed to obtain the thermal efficiencies of its subunits (φ i ); a thermal efficiency model of the whole system φ QY was thus established by correlating the relationship between φ i and φ QY . The thermal efficiency model of the whole system showed that φ i had a positive linear correlation with φ QY ; it was found that the thermal efficiency of the decomposition and clinker calcination unit (φ DC ) had the greatest weight on φ QY , where a 1% increase in φ DC led to a 1.73% increase in φ QY —improving φ DC was shown to be the most effective way to improve φ QY . In this paper, the developed thermal efficiency model was applied to one 5000 MT/D production line. It was found that its φ QY was only 61.70%—about 2.35% lower than a representative line; such decrease was caused by its low φ DC and φ P which, as disclosed by model, were derived from the low decomposition rate of calcium carbonate in preheated meal put into a calciner and the high excess air coefficient of secondary air. Controlled parameter optimization of this 5000 MT/D production line was then carried out. As a result, the φ DC and φ P of the production line were increased from 30.03% and 64.61% to 30.69% and 65.69%, respectively; the φ QY increased from 61.70% to 62.55%; the clinker output of the production line increased from 5799 MT/D to 5968 MT/D; the heat consumption of clinker was reduced from 3286.98 kJ/kg·cl to 3252.41 kJ/kg·cl.

Keywords: thermal efficiency; effective heat; whole system; decomposition rate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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