Dynamic simulation on ash deposition and heat transfer behavior on a staggered tube bundle under high-temperature conditions

Zheng, Zhimin; Yang, Wenming; Cai, Yongtie; Wang, Qingxiang; Zeng, Guang

doi:10.1016/j.energy.2019.116390

Cited by 31 publications

(9 citation statements)

References 33 publications

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“…Furthermore, the size distribution of deposited ash on the windward and leeward are also in accordance with the experimental analysis [40]. These confirm a good agreement between the simulation results and experimental data, enabling the effect of tube layouts on ash deposition to be investigated [27].…”

Section: Model Validationsupporting

confidence: 82%

“…time, the asynchronous growth method with an update cycle of 1s was adopted. The accuracy of this method has been widely recognized [19,27,39] and verified in our previous work [24].…”

Section: Solution Proceduressupporting

confidence: 55%

“…In addition, the simulation time step was set to 0.01 s. In order to reduce the calculation time, the asynchronous growth method with an update cycle of 1s was adopted. The accuracy of this method has been widely recognized [19,27,39] and verified in our previous work [24].…”

Section: Mesh Independence Analysissupporting

confidence: 55%

“…However, the heat transfer exchangers such as superheaters and re-heaters in practical utility boilers are realized in the form of tube bundles, whose arrangement is also found to be an important factor affecting ash deposition [25,26]. For example, Zheng et al [27] studied the effect of the longitudinal pitch and transverse pitch of the tube bundle on ash deposition by using CFD dynamic simulation, with the deposition morphology and thermal efficiency characterized and discussed. The results show that the thermal efficiency of the tube bundle decreased from 0.74 to 0.65 when the ratio of the transverse pitch and tube diameter increased from 1.58 to 2.63.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Numerical Simulation Study into the Effect of Longitudinal and Transverse Pitch on Deposition of Zhundong Coal Ash on Tube Bundles

Guo,

Li,

Liang

et al. 2024

Processes

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In this paper, the dynamic deposition behavior of Na-enriching Zhundong coal ash on tube bundles with varying longitudinal and transverse pitches was numerically studied. By using a modified critical viscosity model, an improved CFD deposition model has been established and key parameters, including deposit mass and morphology, particle trajectories and impaction and sticking probabilities, as well as the heat flux distribution, have been analyzed. The results show that the ash deposited on tubes in the first row is, respectively, 1.74 and 3.80 times higher than that on the second and third rows, proving that ash deposition in the downstream is lessened. As the longitudinal pitch increased from 1.50 D to 2.50 D, deposit mass in the downstream increased two times, suggesting that an increase in longitudinal pitch would aggravate ash deposition. The effect of transverse pitch, however, with the least deposit propensity at St/D = 1.75, is non-linear due to the joint effect of adjacent tubes and walls in affecting particle trajectory. In addition, due to the non-uniform distribution of the deposit, heat flux across the tube is the smallest at the stagnation point but becomes six times higher at two sides and the leeward, which makes the thermal damage of these sides to be warranted as a practical concern.

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Section: Model Validationsupporting

confidence: 82%

“…time, the asynchronous growth method with an update cycle of 1s was adopted. The accuracy of this method has been widely recognized [19,27,39] and verified in our previous work [24].…”

Section: Solution Proceduressupporting

confidence: 55%

Section: Mesh Independence Analysissupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Numerical Simulation Study into the Effect of Longitudinal and Transverse Pitch on Deposition of Zhundong Coal Ash on Tube Bundles

Guo,

Li,

Liang

et al. 2024

Processes

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show abstract

“…Deng et al [32] presented simulations for the particles flow and velocity patterns when flowing across staggered bundle of CCTs in moving bed. Zheng et al [33] simulated the ash deposition and heat exchange behaviour on staggered CCTs bundles. From the presented survey, numerous studies were practically/numerically accomplished aiming to boost the hydrothermal attributes of tube banks.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and thermal performance evaluation of staggered cross flow heat exchangers of semi-circular tubes: I- Effect of pitch ratio and space between bases

A.Alghrubah,

.A. Abd Elrahman,

.R. Salem

et al. 2021

Engineering Research Journal - Faculty of Engineering (Shoubra)

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Staggered cross flow heat exchangers are commonly employed as air coolers and steam generators. This study aims to boost their thermal performance by proposing a modification to the tube geometry; semicircular tube (SCT) instead of complete circular tube (CCT). Through the runs, numerous gaps between SCTs-bases with different pitches in both longitudinal/transversal directions are tested. The runs are performed with moving cooling water through the tubes while heating air flows across the tube bundles. The results state that the SCT can be used as a passive approach for augmenting the heat exchange rates. As geometry, increasing the gap between their bases increases both the heat exchange rate and fluid pressure loss at the same time. Additionally, reducing the longitudinal and/or transversal pitch ratios leads to enlarging these increases. In addition, the thermal performance index (TPI) is slightly augmented by extending the distance between the SCTs' bases or reducing the transversal and/or longitudinal spacings. Also, an increase in the TPI is resulted by raising the airflow rate. Moreover, the extreme determined TPI is 1.98.

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Simulation of surface deposits of micron sand particles in the internal cooling duct with a Gaussian probability density model

Xin,

Yu,

et al. 2024

Comp. Part. Mech.

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Dynamic simulation on ash deposition and heat transfer behavior on a staggered tube bundle under high-temperature conditions

Cited by 31 publications

References 33 publications

A Numerical Simulation Study into the Effect of Longitudinal and Transverse Pitch on Deposition of Zhundong Coal Ash on Tube Bundles

A Numerical Simulation Study into the Effect of Longitudinal and Transverse Pitch on Deposition of Zhundong Coal Ash on Tube Bundles

Experimental study and thermal performance evaluation of staggered cross flow heat exchangers of semi-circular tubes: I- Effect of pitch ratio and space between bases

Simulation of surface deposits of micron sand particles in the internal cooling duct with a Gaussian probability density model

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