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

Pu, Guang-yi; Li, Xiaoyin; Yuan, Fangyang

doi:10.3390/pr9091621

Cited by 11 publications

(3 citation statements)

References 22 publications

(29 reference statements)

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“…This is also accompanied by a drop in the heat release ratio from 89.9% to 62.2%. This conclusion is consistent with those of Pu et al [43], who demonstrated that an increase in the height of the heat storage increases the heat transfer efficiency of the system. A comparison of Figures 10 and 11 implies that the synergistic effect of methane oxidation efficiency and the heat storage/release ratio from the regenerator determines the thermal and stability performances of the system.…”

Section: Effect Of Chamber/regenerator Height Ratiosupporting

confidence: 93%

Analysis of the Effects of Structural Parameters on the Thermal Performance and System Stability of Ventilation Air Methane-Fueled Reverse-Flow Oxidation Reactors

Zhang,

Yang,

Shao

et al. 2024

Processes

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Ventilation air methane (VAM) from coal mining is a low-grade energy source that can be used in combustion systems to tackle the energy crisis. This work presents a numerical analysis of the thermal and stabilization performance of a VAM-fueled thermal reversal reactor with three fixed beds. The effects of the combustion chamber/regenerator height ratio (β), heat storage materials, and porosity on the oxidation characteristics are evaluated in detail. It is shown that the regenerator temperature tends to vary monotonically with β due to the coupling effect of the gas residence time and heat transfer intensity. The optimal β is determined to be 4/6, above which the system may destabilize. Furthermore, it is found that regardless of the methane volume fraction, the regenerator with mullite inserted has the highest temperature among the heat storage materials investigated. In contrast, the temperature gradually decreases and the system becomes unstable as SiC is adopted, signifying the importance of choosing proper thermal diffusivity. Further analysis reveals that the porosity of the heat storage materials has little effect on the system stability. Decreasing the porosity can effectively reduce the oscillation amplitude of the regenerator temperature, but it also results in greater pressure losses.

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Section: Effect Of Chamber/regenerator Height Ratiosupporting

confidence: 93%

Analysis of the Effects of Structural Parameters on the Thermal Performance and System Stability of Ventilation Air Methane-Fueled Reverse-Flow Oxidation Reactors

Zhang,

Yang,

Shao

et al. 2024

Processes

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“…The research on the regenerative chamber was also extended to the entire cuboid-shaped RTO. Although its average thermal efficiency could reach 90%, − the residence time in each period within the oxidation chamber varied greatly, resulting in a nonuniform distribution of velocity and temperature within the oxidation chamber. , This was due to the odd number of regenerative chambers and cuboid-shaped oxidation chamber. The different intake and exhaust regenerative chambers at different periods resulted in differences in the gas flow paths.…”

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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“…The volatile organic compounds (VOCs) emitted into the environment accounted for one-third of the total pollutant emissions in industry [1]. Currently, common methods for the recovery and treatment of VOCs include adsorption, solution absorption, photocatalytic oxidation, and hightemperature oxidation [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Optimization and Simulation Analysis of Furnace Structure for Regenerative Thermal Oxidizer

Niu,

Zhang,

Shi

et al. 2024

E3S Web Conf.

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Volatile Organic Compounds (VOCs) significantly threaten the atmospheric environment. Currently, common methods for the recovery and treatment of VOCs include adsorption, solution absorption, photocatalytic oxidation, and high-temperature oxidation. Among them, the Regenerative Thermal Oxidizer (RTO) is a scheme for high-temperature oxidation treatment of VOCs, which applies aerospace heat transfer and combustion technology to the treatment of VOCs, and the removal efficiency of VOCs can reach over 99%. Considering the high temperature and possible instantaneous overpressure during the combustion process, a three-dimensional flow model of the bottom air distribution chamber and heat storage chamber was established to solve the technical difficulties of the gas flow field in the existing RTO and improve the safety and stability of the overall flow. Simulated the gas flow field and analysed the distribution pattern of the gas flow rate. In response to the uneven distribution of airflow caused by the pipeline layout, orifice plates were installed at the bottom of the furnace, and various orifice plate designs were considered. The results indicate that adding slanted orifice plates can improve flow conditions and enhance safety while meeting practical needs.

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

Cited by 11 publications

References 22 publications

Analysis of the Effects of Structural Parameters on the Thermal Performance and System Stability of Ventilation Air Methane-Fueled Reverse-Flow Oxidation Reactors

Analysis of the Effects of Structural Parameters on the Thermal Performance and System Stability of Ventilation Air Methane-Fueled Reverse-Flow Oxidation Reactors

Velocity and Temperature Simulation for a Cylindrical Regenerative Thermal Oxidizer

Optimization and Simulation Analysis of Furnace Structure for Regenerative Thermal Oxidizer

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