Exergy transfer characteristics of gas-solid heat transfer through sinter bed layer in vertical tank

Feng, Jianmei; Dong, Hua; Gao, Jianye; Liu, Jingyu; Liang, Kai Ming

doi:10.1016/j.energy.2016.05.113

Cited by 14 publications

(5 citation statements)

References 28 publications

(24 reference statements)

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“…Huang et al 13 , based on the actual operation of a sinter plant, studied the gas–solid convective heat transfer characteristics within the waste heat tank, identifying cooling air volume and cold air inlet temperature as key factors, and derived a correlational formula for gas–solid heat transfer in the ore layer. Through further in-depth research, Dong et al 14 , 15 introduced the concept of fire-use transfer coefficient, thereby deriving a formula for the fire-use transfer coefficient of the ore layer within the waste heat tank; they also fitted a correlational formula for the fire-use transfer coefficient of the sinter ore layer using experimental data. Building upon previous research results on gas–solid heat transfer within the sinter ore waste heat tank, Feng et al 16 , 17 primarily applied the theory of porous media and the theory of local non-thermal equilibrium to numerically simulate and analyze three-dimensional steady-state gas–solid heat transfer within the tank.…”

Section: Introductionmentioning

confidence: 99%

Numerical study and orthogonal analysis of optimal performance parameters for vertical cooling of sintered ore

Wang,

Li,

Zhen

et al. 2024

Sci Rep

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The sinter cooler, essential for cooling hot sintered ore to a specific temperature, has seen recent advancements with the introduction of a vertical sinter cooling furnace. This innovation aims to enhance energy efficiency, reduce emissions, and improve waste heat recovery. Despite significant research, a quantitative analysis of factors impacting its cooling and heat transfer efficiency is lacking. This study utilizes the Euler model and local non-equilibrium thermodynamic theory to identify key factors affecting the gas–solid cooperative cooling process in the vertical cooler. Through an orthogonal experimental approach, the paper determines the optimal structural and operational parameters for the furnace. Key findings include that a gas–solid ratio of 1200m^3/t, inlet air temperature of 50 ℃, cooling section height of 6m, and diameter of 13.25m maximize efficiency, achieving a weighted range normalization value of 0.962. This configuration meets sintered ore cooling requirements while optimizing waste heat recovery. The study reveals that the impact on heat transfer efficiency is influenced primarily by the gas–solid ratio, followed by the cooling section's height, diameter, and inlet air temperature. These insights are crucial for enhancing the vertical sinter cooler's design, contributing to more energy-efficient and environmentally friendly sintering processes.

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Section: Introductionmentioning

confidence: 99%

Numerical study and orthogonal analysis of optimal performance parameters for vertical cooling of sintered ore

Wang,

Li,

Zhen

et al. 2024

Sci Rep

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“…Compared with an annular cooler, a vertical cooler is a type of counter-flow moving bed, in which the heat transfer process is a steady-state condition. Due to the complexity of the flow and heat transfer in vertical coolers, correlational studies for vertical coolers were mainly based on experimental research [20][21][22], while few numerical studies in vertical coolers were conducted, and thermal parameter optimization of vertical coolers as the critical issue was rarely considered and mentioned, which resulted in the parameter design of vertical coolers being based more on experience and a lack of theoretical guidance. In addition, the objective functions of parameter optimization in annular coolers mentioned above were mainly the quantity of SWHR and the outlet exergy of the heat carrier, which could not accurately reflect the relationship between system inputs and outputs.…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Efficiency Analysis of Fluid Flow and Heat Transfer in Sinter Vertical Cooler

et al. 2021

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In order to fully understand the energy and exergy transfer processes in sinter vertical coolers, a simulation model of the fluid flow and heat transfer in a vertical cooler was established, and energy and exergy efficiency analyses of the gas–solid heat transfer in a vertical cooler were conducted in detail. Based on the calculation method of the whole working condition, the suitable operational parameters of the vertical cooler were obtained by setting the net exergy efficiency in the vertical cooler as the indicator function. The results show that both the quantity of sinter waste heat recovery (SWHR) and energy efficiency increased as the air flow rate (AFR) increased, and they decreased as the air inlet temperature (AIT) increased. The increase in the sinter inlet temperature (SIT) resulted in an increase in the quantity of SWHR and a decrease in energy efficiency. The air net exergy had the maximum value as the AFR increased, and it only increased monotonically as the SIT and AIT increased. The net exergy efficiency reached the maximum value as the AFR and AIT increased, and the increase in the SIT only resulted in a decrease in the net exergy efficiency. When the sinter annual production of a 360 m2 sintering machine was taken as the processing capacity of the vertical cooler, the suitable operational parameters of the vertical cooler were 190 kg/s for the AFR, and 353 K for the AIT.

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“…During the past decade, a considerable number of research papers have been developed in the field of VSCB, mainly focusing on thermodynamics parameters, such as the solid and gas inlet temperature, solid and gas inlet mass flow rate, aspect ratio of VSCB [1][2][3], and gas pressure loss [4][5][6]. Moreover, optimization studies have examined the coefficient of heat transfer [7,8] and exergy transfer [9,10]. Previous research has demonstrated few effects on improving the performance of heat transfer in VSCB.…”

Section: Introductionmentioning

confidence: 99%

Parametric Study on the Flow Profiles of Vertical Sinter Cooling Bed Using the DEM and Taguchi Method for Waste Heat Recovery

Cai

2020

Energies

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To comprehensively understand the effectiveness of external factors on flow characteristics and realize particle flow distribution evenly in bulk layers is an essential prerequisite for improving the performance of heat transfer in vertical sinter cooling beds (VSCBs). The numerical discrete element method (DEM) was applied to investigate external geometric and operational factors, such as the aspect ratio, geometry factor, half hopper angle, normalized outlet scale, and discharge velocity. Using the Taguchi method, a statistical analysis of the effect of design factors on response was performed. In this study, we focused more on external factors than granular properties, be remodelling the external factors was more useful and reliable for actual production in industries. The results showed that the most important factor was the aspect ratio, followed by the geometry factor, normalized outlet scale, half hopper angle, and discharge velocity for the dimensionless height of mass flow. In terms of the Froude number, the most influential factor was the normalized outlet scale with a contribution ratio of 33.81%, followed by the aspect ratio (22.86%), geometry factor (17.73%), discharge velocity (17.73%), and half hopper angle (11.83%).

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Exergy transfer characteristics of gas-solid heat transfer through sinter bed layer in vertical tank

Cited by 14 publications

References 28 publications

Numerical study and orthogonal analysis of optimal performance parameters for vertical cooling of sintered ore

Numerical study and orthogonal analysis of optimal performance parameters for vertical cooling of sintered ore

Energy and Exergy Efficiency Analysis of Fluid Flow and Heat Transfer in Sinter Vertical Cooler

Parametric Study on the Flow Profiles of Vertical Sinter Cooling Bed Using the DEM and Taguchi Method for Waste Heat Recovery

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