3D numerical simulation and optimization of honeycomb regenerators with parallel or crosswise arrangement of circular holes

You, Yonghua; Wu, Zhongda; Li, Bin; Zhuang, Zhang; Pan, Shuting; Xu, Xuecheng

doi:10.1016/j.cep.2019.01.010

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…Many research studies have been conducted on the cuboid-shaped RTO, focusing on the regenerative chamber and the regenerative chamber channel. − The research included the influence of operating parameters on the temperature and heat transfer in the regenerative chamber, such as structural parameters of the regenerator and regenerative chamber, − switching time, − and superficial velocity. ,,, Due to the homogenization effect by the regenerator unit, the gas flow exhibited a relatively uniform velocity and temperature distribution in the cross-section perpendicular to the flow direction. Researchers presented different findings.…”

Section: Introductionmentioning

confidence: 99%

Velocity and Temperature Simulation for a Cylindrical Regenerative Thermal Oxidizer

Ren,

Zhang,

Qin

et al. 2024

ACS Omega

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The cylindrical regenerative thermal oxidizer (CRTO) came into being later than the three-chamber regenerative thermal oxidizer (TRTO). Compared with TRTO, CRTO has a smaller size and a larger regenerator volume for absorbing and releasing heat. There are few studies on CRTO despite its numerous applications. A CRTO was selected in industrial applications for simulation research. The velocity and temperature of the CRTO were investigated after error analysis of industrial and simulated data. It was found that the velocity and temperature in the regenerative chamber had obvious stratification and gradients after homogenization by the regenerator unit. The velocity and temperature distribution in the oxidation chamber were independent of the position of the CRTO inlet and outlet or the structure below the regenerator, and there were identical periodic changes in each period. A TRTO with primary parameters as those of the CRTO was employed for comparison. The time of the intake and exhaust periods of a CRTO regenerative chamber were 30 s longer than those of a TRTO. The regenerator volume of heat storage used by CRTO for heat exchange increased by 1/6 compared to that of TRTO at the same total regenerator volume. Simulation shows that CRTO had a more uniform velocity and temperature in the regenerative chamber compared to those in TRTO, increasing by approximately 2%; the thermal efficiency is higher, with an average increase of about 3%.

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Section: Introductionmentioning

confidence: 99%

Velocity and Temperature Simulation for a Cylindrical Regenerative Thermal Oxidizer

Ren,

Zhang,

Qin

et al. 2024

ACS Omega

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“…It was found that the heat recovery efficiency increased with the increase in packing height. Furthermore, they presented the heat transfer and flow resistance performances of the RTOs with the parallel or crosswise arrangement of circular holes, and found the optimal lengths of these arrangements are approximately 307 mm and 342 mm, respectively [13]. Yuan et al [14] compared regenerative media with square openings and hexagon openings finding that the energy recovery ratio of regenerative media with the square openings was 5% to 16% higher than that of hexagon opening regenerative media, while the pressure loss increased with the decreasing of opening side length.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Heat Transfer Efficiency of Regenerative Thermal Oxidizers with Three Canisters

Yuan

2021

Processes

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The heat transfer efficiency of a regenerative thermal oxidizer with three canisters used for volatile organic compounds treatment was studied using numerical simulation methods. A one-dimensional model that took into account the variation of physical parameters with temperature was built. The results show that the preheating temperature and outlet temperature tend to be stable as the operation time is increased. The heat transfer efficiency of equipment was mainly evaluated by heat recovery efficiency and energy recovery ratio under steady state conditions, which was affected by the inlet gas flow and temperature, valve switch time, combustion temperature, materials and porosity of the regenerative medium, and packing height. With the increase in packing cross-sectional area and packing height, the increase in heat transfer efficiency leads to an increase in equipment cost. Simultaneously, the shorter the valve switch time and the higher the density of the regenerative medium battery also help to improve the heat transfer efficiency without blocking equipment. Unless the removal efficiency of volatile organic compound treatment is reduced, it is recommended to reduce the inlet and combustion temperatures.

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“…The structure of the regenerator can be divided into two categories: porous material type and plate stack type. The former can be subdivided into wire-mesh type, 22,23 honeycomb type, 24 etc. The latter includes parallel-plate type, 25,26 oblique corrugated plate type, 27 etc.…”

mentioning

confidence: 99%

Analytical solutions of heat storage and heat transfer performance of parallel‐plate regenerators in Stirling cycle

et al. 2020

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Summary Parallel‐plate regenerators (PPR), with flow resistance lower than traditional wire‐mesh regenerators, can improve the thermal efficiency of Stirling engines (SEs). However, as working frequency or plate thickness increase, the heat cannot penetrate into the plate effectively, resulting only the surface part of the plates to have substantial temperature variation, while the internal part fails to store and exchange heat energy. In order to obtain high performance of PPR, the heat storage efficiency and the heat transfer coefficient, as well as their influential factors, are theoretically studied. Three parameters are found to play an important role, which are working frequency, plate thickness, and thermal diffusivity of materials. Their roles can be represented by a dimensionless parameter as a whole, which is the relative thickness, e. By the critical value of relative thickness, ecr = 2.4, two distinct working conditions can be divided, thermally penetrated condition as e < ecr and thermally non‐penetrated condition as e > ecr. Under thermally penetrated condition, the heat storage efficiency is high, and the heat transfer coefficient is high enough when e > 1.6, while under thermally non‐penetrated condition, the heat storage efficiency is low. In conclusion, by comprehensively considering the heat storage efficiency and heat transfer coefficient, it is recommended that the relative thickness e should be chosen within the range [1.6, 2.4]. And the optimal working frequency, plate thickness, and suitable material can be determined accordingly.

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3D numerical simulation and optimization of honeycomb regenerators with parallel or crosswise arrangement of circular holes

Cited by 6 publications

References 16 publications

Velocity and Temperature Simulation for a Cylindrical Regenerative Thermal Oxidizer

Velocity and Temperature Simulation for a Cylindrical Regenerative Thermal Oxidizer

Numerical Study on Heat Transfer Efficiency of Regenerative Thermal Oxidizers with Three Canisters

Analytical solutions of heat storage and heat transfer performance of parallel‐plate regenerators in Stirling cycle

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