Thermodynamic simulation and economic analysis of molten salt thermal energy storage system

Main Article Content

C. Lerdsrisampan
T. Pota
P. Larpratanaprapha
Y. Sukjai

Abstract

This research focuses on applying thermal energy storage system using molten salt as a storage medium to the steam production system of a food processing factory. Parabolic trough solar collector was installed as a heat source for a hot oil steam generator which was used to produce steam for pasteurization. Previously, only fossil-fuel boilers were used to produce steam. In this work, two tank molten salt system was considered. The system consists of a cold tank and a hot tank to be used for steam production at night or when there is no sunlight for up to 4 hours per day instead of using fossil-fueled boilers. The process flow diagram of the existing steam production system was created in Aspen Hysys. Then it has been modified with the molten salt thermal energy storage system. Hot oil (PTT-Hitemp 500) is used an intermediary for receiving thermal energy from the solar collector to the steam generator, while molten salt (60% KNO3 and 40% NaNO3) acts as a thermal energy storage medium. The simulation result showed that the thermal energy storage could produce saturated steam at the pressure of 6 bar and 158 °C with sufficient flow rate to meet production’s demand at 0.5 m3/hr. Economic analysis of the molten salt thermal energy storage system has been performed and key performance indicators have been evaluated. All indicators show favorable result, thus, indicating that the molten salt thermal energy storage system is economically feasible.

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How to Cite
Lerdsrisampan, C., Pota, T., Larpratanaprapha, P., & Sukjai, Y. (2021). Thermodynamic simulation and economic analysis of molten salt thermal energy storage system. Journal of Research and Applications in Mechanical Engineering, 9(1), JRAME–21. Retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/243580
Section
RESEARCH ARTICLES

References

Energy Green and Technology Co., Ltd. Solar power, 2015-2016, URL: https://www.energy-techno.com/964885/, accessed on 09/2019, 2020.

Lerdsrisampan, C., Pota, T., Larpratanaprapha, P. Thermodynamic and Economic Analysis of Molten Salt Thermal Energy Storage System (Bachelor’s thesis), 2020, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand. (In Thai).

Codd, D.S., Zhou, L., Grange, B., Calvet, N., Armstrong, P., Gil Pujol, A., et al. Design of a 100 kW concentrated solar power on demand volumetric receiver with integral thermal energy storage prototype. Paper presented in ASME Power Conference, 2015, California, USA.

Li, X., Xu, E., Song, S., Wang, X., Yuan, G. Dynamic simulation of two-tank indirect thermal energy storage system with molten salt, Renewable Energy, Vol. 113, 2017, pp. 1311-1319.

Peiró, G., Gasia, J., Miró, L., Prieto, C., Cabeza, L.F. Experimental analysis of charging and discharging processes, with parallel and counter flow arrangements, in a molten salts high temperature pilot plant scale setup, Applied Energy, Vol. 178, 2016, pp. 394-403.

Cengel, Y. A. and Boles, M. A. Thermodynamics: An Engineering Approach 6th Editon (SI Units), 2007, McGraw-Hill Companies, New York.

Peters, M.S., Timmerhaus, K.D., West, R.E., Timmerhaus, K., West, R. Plant design and economics for chemical engineers (Vol. 4), 1968, McGraw-Hill, New York.

Onestockhome CO., Ltd. Steel pipe, URL: https://www.onestockhome.com/th/steel/steel-pipe-black, accessed on 03/2020, 2020.

Thai P.S. Mechinery Co., Ltd. Gear pump, URL: http://thaipsm.com/product/1640/Gear%20Pumps, accessed on 03/2020, 2020.

Hydro - Informatics Institute (Public Organization). Amount of Rainfall, URL: https://www.thaiwater.net/Interpolated/ShowImg.php?sdate=2019-04-30&subm=1, accessed on 02/2020, 2020.