Recovery of waste heat in cement plants for the capture of CO<sub>2

doi:10.1007/s11705-011-1166-0

Front Chem Sci Eng

2012, Vol. 6

Issue (1) : 104-111 https://doi.org/10.1007/s11705-011-1166-0

RESEARCH ARTICLE

Recovery of waste heat in cement plants for the capture of CO₂

Ruifeng DONG, Zaoxiao ZHANG(

), Hongfang LU, Yunsong YU

State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

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Abstract

Large amounts of energy are consumed during the manufacturing of cement especially during the calcination process which also emits large amounts of CO₂. A large part of the energy used in the making of cement is released as waste heat. A process to capture CO₂ by integrating the recovery and utilization of waste heat has been designed. Aspen Plus software was used to calculate the amount of waste heat and the efficiency of energy utilization. The data used in this study was based on a dry process cement plant with a 5-stage preheater and a precalciner with a cement output of 1 Mt/y. According to the calculations: 1) the generating capacity of the waste heat recovery system is 4.9 MW. 2) The overall CO₂ removal rate was as high as 78.5%. 3) The efficiency of energy utilization increased after the cement producing process was retrofitted with this integrated design.

Keywords cement industry waste heat recovery utilization CO₂ removal

Corresponding Author(s): ZHANG Zaoxiao,Email:zhangzx@mail.xjtu.edu.cn

Issue Date: 05 March 2012

Cite this article:

Ruifeng DONG,Zaoxiao ZHANG,Hongfang LU, et al. Recovery of waste heat in cement plants for the capture of CO_{2[J]. Front Chem Sci Eng,
2012, 6(1): 104-111.}

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-011-1166-0
https://academic.hep.com.cn/fcse/EN/Y2012/V6/I1/104

Fig.1 General flow diagram for a cement plant

Fig.2 Schematic of a cement plant with post-combustion CO capture integrated with waste heat recovery

Tab.1 The components in the exhaust gas from a typical cement plant

Fig.3 The composite curves of a CO capture system with integrated waste heat recovery

Fig.4 The heat exchange network of a CO capture system with integrated waste heat recovery

Tab.2 Calculation results

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