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

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.

Key words： cement industry; waste heat; recovery; utilization; CO₂ removal

Acknowledgements

Financial support from the National Natural Science Foundation of China (Grant Nos. 50976090 and 20936004) is greatly appreciated.

References

1 Yu Y S, Li Y, Lu H F, Yan L W, Zhang Z X, Wang G X, Rudolph V. Multi-field synergy study of CO₂ capture process by chemical absorption. Chemical Engineering Science, 2010, 65(10): 3279-3292

2 Yu Y S, Li Y, Lu H F, Yan L W, Zhang Z X. Performance improvement for chemical absorption of CO₂ by global field synergy optimization. International Journal of Greenhouse Gas Control, 2011, 5(4): 649-658

3 Sheinbaum C, Ozawa L. Energy use and CO₂ emissions for Mexico’s cement industry. Energy, 1998, 23(9): 725-732

4 Liu F, Ross M, Wang S M. Energy efficiency of China’s cement industry. Energy, 1995, 20(7): 669-681

5 Özdoĝan S, Arikol M. Energy and exergy analyses of selected Turkish industries. Energy, 1995, 20(1): 73-80

6 Hasanbeigi A, Price L, Lu H Y, Lan W. Analysis of energy-efficiency opportunities for the cement industry in Shandong Province, China: a case study of 16 cement plants. Energy, 2010, 35(8): 3461-3473

7 Barker D J, Turner S A, Napier-Moore P A, Clark M, Davison J E. CO₂ capture in the cement industry. Energy Procedia, 2009, 1(1): 87-94

8 Hassan S M N. Techno-Economic Study of CO₂ Capture Process for Cement Plants. Ontario: University of Waterloo, 2005

9 Qian J R. An equipment for recovering and utilizing the waste heat from cement rotary kiln. CN Patent, 200810059507. 2008-<month>10</month>-<day>22</day>

10 Bosoaga A, Masek O, Oakey J E. CO₂ capture technologies for cement industry. Energy Procedia, 2009, 1(1): 133-140

11 Madhawa Hettiarachchi H D, Golubovic M, Worek W M, Ikegami Y. Optimum design criteria for an Organic Rankine cycle using low-temperature geothermal heat sources. Energy, 2007, 32(9): 1698-1706

12 Ravanchi M T, Sahebdelfar S, Zangeneh F T. Carbon dioxide sequestration in petrochemical industries with the aim of reduction in greenhouse gas emissions. Frontiers of Chemical Science and Engineering, 2011, 5(2): 173-178

13 Duke M C, Ladewig B, Smart S, Rudolph V, Costa J C D. Assessment of postcombustion carbon capture technologies for power generation. Frontiers of Chemical Engineering in China, 2010, 4(2): 184-195

14 Li Q, Yu Y S, Jiang J, Zhang Z X. CO₂ capture by chemical absorption method based on heat pump technology. Journal of Chemical Engineering of Chinese University, 2010, 24(1): 29-34 (in Chinese)

15 Yu Y S, Li Y, Li Q, Jiang J, Zhang Z X. An innovative process for simultaneous removal of CO₂ and SO₂ from flue gas of a power plant by energy integration. Energy Conversion and Management, 2009, 50(12): 2885-2892

16 Nakaiwa M, Huang K, Endo A, Ohmori T, Akiya T, Takamatsu T. Internally heat-integrated distillation columns: a review. Chemical Engineering Research & Design, 2003, 81(1): 162-177