Coupled characterization and experimental verification of heat transfer and air leakage in a quad-sectional rotary air preheater

Du, Xianliu; Shi, Yuetao; Wang, Xueyi

doi:10.1016/j.applthermaleng.2019.113923

Cited by 10 publications

(1 citation statement)

References 26 publications

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“…Zhang et al [20] proposed an online application approach to monitor the gap size and estimate the direct leakage of the air preheater. Du et al [21] established a model by coupling the air leakage and the thermodynamics to investigate the leakage matter. The results show that the total leakage of quad-sectional air preheater is less than that of tri-sectional by 33.1%.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations on the Local Direct Leakage Process of Rotary Regenerative Air Preheater

Zhu

et al. 2020

Applied Sciences

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An inherent defect of the operating rotary air preheaters (RAPH) is known as leakage, which seriously hinders the efficient and safe operation of RAPH. It is significant for the estimation of the direct leakage to determine the effects of different structure parameters of sealing sheets and different operation parameters of a RAPH. A direct leakage set-up was built and a three-dimensional numerical model was established to explore the local direct air leaking process of rotary regenerative air preheater and study the effects of geometrical and operational parameters on the leakage. The numerical simulation using the transition k-kl-ω turbulence model was verified by the experimental results. The results show that the local direct air leakage mainly depends on the total pressure difference between the two sides of the seal instead of the one-side pressure. The air leakage can be significantly reduced by narrowing the leakage gap. The increase in the number of sealing sheets can reduce the air leakage own to the increase in the leakage resistance. The increase in the spacing between the adjacent sealing sheets can enlarge the recirculation zone and increase the energy loss of mainstream, greatly reducing the local direct air leakage. Due to the different size recirculation zone formation and streamline curvature induced by sealing sheet, the effect of bending angle on the direct air leakage varies. To obtain lower leakage rate, it is recommended for the rotor of tri-sectional air preheater to pass through flue gas section, secondary-air section, and primary-air section in sequence.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations on the Local Direct Leakage Process of Rotary Regenerative Air Preheater

Zhu

et al. 2020

Applied Sciences

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Design and operational condition optimization of a rotary regenerative heat exchanger

Güllüce

Özdemir

2020

Applied Thermal Engineering

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Investigation on regenerative heat exchanger with novel low-leakage system for flue gas denitration in steel industry

Wang

Zhu

et al. 2020

Applied Thermal Engineering

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Coupled characterization and experimental verification of heat transfer and air leakage in a quad-sectional rotary air preheater

Cited by 10 publications

References 26 publications

Experimental and Numerical Investigations on the Local Direct Leakage Process of Rotary Regenerative Air Preheater

Experimental and Numerical Investigations on the Local Direct Leakage Process of Rotary Regenerative Air Preheater

Design and operational condition optimization of a rotary regenerative heat exchanger

Investigation on regenerative heat exchanger with novel low-leakage system for flue gas denitration in steel industry

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