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

Cheng, Zude; Wang, Haitao; Feng, Jianmei; Xia, Yongfang; Dong, Hua

doi:10.3390/en14154522

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…Soma [19] and Dunbar et al [20] were the first to propose the concept of exergy transmission. Zude Cheng et al [21] conducted detailed energy efficiency and exergy efficiency analyses on gas-solid heat transfer in vertical coolers. Prommas et al [22] investigated the effect of porous structural parameters and thermodynamic conditions on the energy and exergy transfer process.…”

Section: Introductionmentioning

confidence: 99%

A Study of a Two-Phase Heat Transfer Mechanism in a Vertical Sintering Cooling Furnace

Xu,

Wang,

Zhen

et al. 2024

Energies

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In order to explore the law of gas–solid countercurrent cooling heat transfer in a vertical sinter cooling furnace at a high temperature, based on the Euler model and the local non-thermodynamic equilibrium theory, an exergy efficiency model was built to evaluate the heat transfer process in the vertical sinter cooling furnace with different parameter changes. It was found that the inlet temperature of cooling air and sinter inlet temperature are the main factors affecting the temperature field and gas–solid heat transfer characteristics in the furnace. Under the conditions of each parameter, the cooling air temperature presents a radial “M” shape distribution. The axial cooling section is the most intense area of gas–solid heat transfer, and this part has the best heat transfer effect. When the inlet temperature of cooling air and the inlet temperature of sinter increase, the outlet temperature of sinter and the outlet temperature of cooling air increase. When the sinter equivalent diameter increases, the cooling air outlet temperature decreases gradually, while the sinter outlet temperature increases gradually. When the diameter and height of the cooling section increase, respectively, the outlet temperature of the sinter decreases and the outlet temperature of the cooling air increases. Based on dimensional analysis, the heat transfer correlation formula suitable for certain test conditions is obtained.

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Section: Introductionmentioning

confidence: 99%

A Study of a Two-Phase Heat Transfer Mechanism in a Vertical Sintering Cooling Furnace

Xu,

Wang,

Zhen

et al. 2024

Energies

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“…The existing research on sinter vertical cooling furnace has mainly focused on the pressure drop characteristics of cooling gas in such a furnace [7][8][9][10], gas-solid heat transfer characteristics [11][12][13][14], and operation parameter optimization [15][16][17][18]. There are few reports on how to weaken the gas "short circuit" in the furnace.…”

mentioning

confidence: 99%

Effect of Furnace Structure on Burden Distribution and Gas Flow in Sinter Vertical Cooling Furnace

Li,

Qi,

Zhang

2023

Applied Sciences

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Sinter sensible heat recovery via a vertical cooling furnace is a new type of waste heat recovery process proposed based on coke dry quenching. However, the segregation of the burden in a vertical cooling furnace is serious, resulting in a large amount of cooling gas escaping from the short-circuit channel of the vertical cooling furnace, which seriously affects the uniform gas–solid heat transfer in the furnace. To improve the burden distribution and gas flow in such a furnace, this paper proposes a Venturi-type vertical cooling furnace. Based on the single silo of a vertical cooling furnace in Meishan Steel, a slot model was established, and the improvement effect of the Venturi furnace structure on the burden distribution and gas flow was studied using the DEM–CFD coupling method. The results show that compared with the existing furnace type, the inclined wall of the Venturi furnace changed the direction of the high Dnv (average diameter) channel from vertical to inclined-vertical and reduced the Dnv from >0.033 m to 0.028~0.03 m in the vertical part of the variable-diameter section, thus reducing the influence area of the high Dnv channel. The minimum and average values of the voidage in the contraction part of the variable-diameter section increased from 0.28 and 0.315 to 0.31 and 0.33, respectively, which caused the voidage distribution to change from U-shaped to W-shaped along the longitudinal direction while simultaneously reducing the longitudinal fluctuation range of the voidage from 0.28~0.39 to 0.298~0.37. The gas flow direction changed from vertical-upward to vertical-inclined-upward, which increased the gas–solid contact. The gas velocity increased significantly. In the vertical section, the average gas velocity was 2.34 m/s, which was 30.73% higher than the velocity of 1.79 m/s of the existing furnace type. In the variable-diameter section, the average gas velocity was 3.52 m/s, which was 72.55% higher than the velocity of 2.04 m/s of the existing furnace type. The high-speed gas channel basically only existed in the sidewall area and the center area of the vertical section, and the length was reduced from 3.11 m to 2.52 m, which reduced the influence area. In the variable-diameter section, the high-speed gas channel disappeared, and the uniformity of the gas velocity distribution was greatly improved. The gas pressure drop increased from 4140 Pa to 6410 Pa, with an increase of 54.83%. Therefore, when designing the Venturi furnace type, it was necessary to take into consideration the improvement in the gas velocity distribution and the increase in the pressure drop. The research results of this paper can provide guidance for the structure optimization of the sinter vertical cooling furnace.

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Simulation of gas–solid flow in sinter vertical cooling furnace

Chen

et al. 2023

J. Iron Steel Res. Int.

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

Cited by 4 publications

References 26 publications

A Study of a Two-Phase Heat Transfer Mechanism in a Vertical Sintering Cooling Furnace

A Study of a Two-Phase Heat Transfer Mechanism in a Vertical Sintering Cooling Furnace

Effect of Furnace Structure on Burden Distribution and Gas Flow in Sinter Vertical Cooling Furnace

Simulation of gas–solid flow in sinter vertical cooling furnace

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