Energy Saving of Composite Agglomeration Process (CAP) by Optimized Distribution of Pelletized Feed

Guanghui Li, Chen Liu, Zhengwei Yu, Mingjun Rao, Qiang Zhong, Yuanbo Zhang and Tao Jiang
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Guanghui Li: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Chen Liu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Zhengwei Yu: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Mingjun Rao: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Qiang Zhong: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Yuanbo Zhang: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Tao Jiang: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

Energies, 2018, vol. 11, issue 9, 1-12

Abstract: The composite agglomeration process (CAP) aims at sintering a pelletized feed and a matrix feed together to produce a high-quality burden for a blast furnace. The pelletized feed is balled from fine iron concentrate or refractory iron-bearing resources, while the matrix feed is granulated from iron ore fines, fuels, fluxes and so on. Through mathematical calculation, heat accumulation regularity and heat-homogenizing of the sinter bed are acquired in CAP when pelletized feed is uniformly distributed. Then they are studied in the composite agglomeration process with optimized pelletized feed distribution, which is a novel and perfect sinter bed structure. Results show that large heat input gaps exist in the sinter bed under condition of even sinter mixture distribution, and it is very difficult to realize bed heat-homogenization by directly varying the solid fuel dosage among each layer. An optimized pelletized feed distribution realizes more heat in the upper layer together with heat-homogenization of the middle-lower layer when the proportions of pellets increase first in the middle-upper layer and then decrease in the middle-lower layer of the sinter bed. Under these circumstances, the sinter bed has much better available accumulation ratios with a maximum value of 78.29%, and possesses a greater total heat input of 6754.27 MJ when the coke breeze remains at the original dosage. To make full use of the available heat accumulation and adjust the pellet distribution, a good energy saving effect is obtained because the coke breeze mass declines by 13.91 kg/t-sinter. The current gross heat inputs of each unit are reduced remarkably, leading to a total heat input decrease of 25.95%. In pot tests of CAP, the differences of thermal parameters in whole bed are obviously reduced with the optimized pelletized feed distribution, which contributes to sinter homogeneity and energy savings.

Keywords: composite agglomeration process; automatic heat accumulation; bed heat-homogenization; thermal status; energy saving (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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