Numerical study on flow and heat transfer of high‐pressure syngas in membrane helical‐coil heat exchanger

Yang, Zhen; Zhao, Zhenxing; Liu, Yinhe; Wang, Xiangyu; Chang, Yongqiang; Cao, Zhenggang

doi:10.1002/apj.649

Cited by 4 publications

(2 citation statements)

References 38 publications

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“…Experiments under high‐temperature and high‐pressure conditions are seriously tough to be conducted. Many numerical models have been presented for the performance of entrained‐flow gasifiers and the multiphase flow and heat transfer process in syngas cooler . Yang developed a computationally efficient reactor network model to investigate a newly designed oxygen‐staged membrane wall entrained‐flow gasifier and provided operational guidelines for improving operational economy and safety.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the performance of an adapted radiant syngas cooler with water spray for entrained‐flow gasifier

Guo

Qiu

et al. 2016

Asia-Pacific J Chem Eng

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An adapted radiant syngas cooler (RSC) with water spray for entrained-flow gasifier has been techinically reformed to achieve higher reliability and availability of coal-gasification-based system. The multiphase flow, heat transfer and mass transfer processes in this adapted RSC have been studied by a developed 3D computational fluid dynamics model. A Eulerian-Lagrangian method is adopted to describe the flow behavior of the syngas, slag/ash particle and water droplets. The surface temperature of water wall T a is calculated using heat flux balance equations by compiling user-defined functions.The predicted values agree well with the measured ones obtained from a practical gasification plant. In the inner cylinder, syngas temperature contours are similar to circulars dispersed from center to the division walls and have a high gradient near water walls, especially close to the division walls. The gradient of T a from center to division walls is similar to that of gas temperature. This adapted RSC with water spray has a better flexibility, while the flow rate of water spray can be adjusted for different operating conditions of gasifier.Ash fusion temperatures are measured under reducing conditions. DT, initial deformation temperature; ST, spherical temperature; HT, hemispherical temperature; FT, fluid temperature.Asia-Pacific Journal of Chemical Engineering NUMERICAL STUDY ON ADAPTED RADIANT SYNGAS COOLER WITH WATER SPRAY 249

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Section: Introductionmentioning

confidence: 99%

Numerical study on the performance of an adapted radiant syngas cooler with water spray for entrained‐flow gasifier

Guo

Qiu

et al. 2016

Asia-Pacific J Chem Eng

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“…Moreover, the realizable k-e model is confirmed to have good performance in modeling the flows outside membrane helical coils [25,26].…”

Section: Turbulence Modelmentioning

confidence: 77%

Influence of Tube Arrangement on the Thermal Hydraulic Performance of a Membrane Helical-Coil Heat Exchanger

Zhao

Che

2012

Numerical Heat Transfer, Part A: Applications

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Thermalhydraulic performances of membrane helical-coil heat exchangers in in-line and staggered arrangements, are numerically investigated. The influences of Reynolds number, dimensionless pitch, and arrangement on heat transfer and flow are discussed. Moreover, the axial and tangential velocity distributions were presented for various pitches and arrangements. The results show that the membrane helical-coil arrangement has a profound effect on the thermalhydraulic performance. For the smaller radial pitch (s 1 /d < 1.8), the heat transfer coefficient in in-line arrangement is higher than that in staggered arrangement. Meanwhile, the in-line arrangement gives a significantly higher friction factor than the staggered arrangement. However, for the larger radial pitch (s 1 /d ! 1.8), the coil arrangement appears to have no effect on the heat transfer and friction factor. In addition, the average Nusselt number Nu and the friction factor f for in-line and staggered arrangements were calculated and correlated against the Reynolds number and structural parameters. According to the thermalhydraulic performance evaluation criterion, the staggered arrangement is recommended as the optimal coil arrangement.

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Comparison of the fluid flow and heat transfer in shell‐and‐tube heat exchangers with different baffles and tubes: simulation and experimental studies

Liu

Qian

2016

Asia-Pacific J Chem Eng

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Large‐and‐small‐hole (LASH) baffle is a new shell‐side fluid flow‐guide structure, and corrugated tube is the widely used as the heat transfer enhancement tube. In this paper, numerical simulations and experimental studies were carried out for the fluid flow and heat transfer in six shell‐and‐tube heat exchangers designed with LASH baffles, segmental LASH baffles, traditional single‐segmental baffles, and corrugated and plain tubes. It is found that under the same fluid flow conditions, the tube vibration in the heat exchangers with LASH baffles are significantly reduced and the shell‐side pressure drops are decreased compared with those having the conventional single‐segmental baffles. In terms of the overall heat transfer coefficient, the heat exchangers with the corrugated tubes are much better than those with the plain tubes. Heat exchangers with the LASH baffles and corrugated tubes have the best comprehensive properties and thus will inspire broader application for engineering considerations. © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.

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Numerical study on flow and heat transfer of high‐pressure syngas in membrane helical‐coil heat exchanger

Cited by 4 publications

References 38 publications

Numerical study on the performance of an adapted radiant syngas cooler with water spray for entrained‐flow gasifier

Numerical study on the performance of an adapted radiant syngas cooler with water spray for entrained‐flow gasifier

Influence of Tube Arrangement on the Thermal Hydraulic Performance of a Membrane Helical-Coil Heat Exchanger

Comparison of the fluid flow and heat transfer in shell‐and‐tube heat exchangers with different baffles and tubes: simulation and experimental studies

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