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.
. Recovery of waste heat in cement plants for the capture of CO2[J]. Frontiers of Chemical Science and Engineering, 2012, 6(1): 104-111.
Ruifeng DONG, Zaoxiao ZHANG, Hongfang LU, Yunsong YU. Recovery of waste heat in cement plants for the capture of CO2. Front Chem Sci Eng, 2012, 6(1): 104-111.
Brown M A, Jackson R, Cox M, Cortes R, Deitchman B, Lapsa M V. Making industry part of the climate solution: policy options to promote energy efficiency. Department of Energy (Internet). May 2011 (cited 2011 June 13). Available from http://www.osti.gov/energycitations/product.biblio.jsp? uery_id=1&page=0&osti_id=1016041
kt/y
55.7
31.7
-15.8
-10.9
Overall CO2 emissions
kt/y
784.1
760.1
172.6
168.6
Overall CO2 reduction rate
%
-
3.1
78.0
78.5
Tab.2
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