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Thermal-Fluid Characteristics of Heating Element in Rotary Heat Exchanger in Accordance with Fouling Phenomena

Authors: Young Mun Lee, Seon Ho Kim, Seok Min Choi, JeongJu Kim, Seungyeong Choi, Hyung Hee Cho

Abstract:

To decrease sulfur oxide in the flue gas from coal power plant, a flue gas de-sulfurization facility is operated. In the reactor, a chemical reaction occurs with a temperature change of the gas so that sulfur oxide is removed and cleaned air is emitted. In this process, temperature change induces a serious problem which is a cold erosion of stack. To solve this problem, the rotary heat exchanger is managed before the stack. In the heat exchanger, a heating element is equipped to increase a heat transfer area. Heat transfer and pressure loss is a big issue to improve a performance. In this research, thermal-fluid characteristics of the heating element are analyzed by computational fluid dynamics. Fouling simulation is also conducted to calculate a performance of heating element. Numerical analysis is performed on the situation where plugging phenomenon has already occurred and existed in the inlet region of the heating element. As the pressure of the rear part of the plugging decreases suddenly and the flow velocity becomes slower, it is found that the flow is gathered from both sides as it develops in the flow direction, and it is confirmed that the pressure difference due to plugging is increased.

Keywords: Heating element, plugging, rotary heat exchanger, thermal fluid characteristics.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1314891

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References:


[1] J. Stasiek, M.W. Collins, M. Ciofalo, and P.E. Chew, “Investigation of flow and heat transfer in corrugated passages-1. Experimental results,” International Journal of Heat and Mass Transfer, 1995, 39 (1), 149–164.
[2] M. Ciofalo, J. Stasiek, and M.W. Collins, “Investigation of flow and heat transfer in corrugated passages-2. Numerical Simulations,” International Journal of Heat and Mass Transfer, 1995, 39 (1), 165–192
[3] Vulloju, S. “Analysis of Performance of Ljungstrom Air Preheater Elements,” International Journal of Current Engineering and Technology 2013, 2 (2), 501–505.
[4] Cho, H. H.; Lee, S. Y.; Rhee, D. H. “Effects of cross ribs on heat/mass transfer in a two-pass rotating duct,” Heat and Mass Transfer 2004, 40 (10), 743–755.
[5] Cho, H.-H.; Kim, Y. Y.; Rhee, D.-H.; Lee, S. Y.; Wu, S. J.; Choi, C. K. “The effects of gap position in discrete ribs on local heat/mass transfer in a square duct,” Journal of Enhanced Heat Transfer 2003, 10 (3).
[6] Chung, H.; Park, J. S.; Park, S.; Choi, S. M.; Rhee, D.-H.; Cho, H. H. “Augmented heat transfer with intersecting rib in rectangular channels having different aspect ratios,” International Journal of Heat and Mass Transfer 2015, 88, 357–367.
[7] Hwang, S. D.; Jang, I. H.; Cho, H. H. “Experimental study on flow and local heat/mass transfer characteristics inside corrugated duct,” International Journal of Heat and Fluid Flow 2006, 27 (1), 21–32.
[8] Kwon, H. G.; Hwang, S. D.; Cho, H. H. “Flow and heat/mass transfer in a wavy duct with various corrugation angles in two dimensional flow regimes,” Heat and Mass Transfer 2008, 45 (2), 157–165.
[9] Dallaire, J.; Gosselin, L.; da Silva, A. K. “Conceptual optimization of a rotary heat exchanger with a porous core,” International Journal of Thermal Sciences 2010, 49 (2), 454–462.
[10] Alhusseny, A.; Turan, A. “An effective engineering computational procedure to analyse and design rotary regenerators using a porous media approach,” International Journal of Heat and Mass Transfer 2016, 95, 593–605.
[11] Lee, Y.M.; Chung, H.; Kim, S.H.; Bae, H.S.; Cho, H.H. “Optimization of the Heating Element in a Gas-Gas Heater Using an Integrated Analysis Model,” Energies 2017, 10 (12), 1932.
[12] Mbabazi, J. G.; Sheer, T. J. “Computational prediction of erosion of air heater elements by fly ash particles,” Wear 2006, 261 (11–12), 1322–1336.
[13] Chen, H.; Pan, P.; Shao, H.; Wang, Y.; Zhao, Q. “Corrosion and Viscous Ash Deposition of a Rotary Air Preheater in a Coal-Fied Power Plant,” Applied Thermal Engineering 2016.