Heat transfer characteristics of a ceramic honeycomb regenerator for an oxy-fuel combustion furnace

Kang, Kyung‐Hwa; Hong, Sungkook; Noh, Dong-Soon; Ryou, Hong Sun

doi:10.1016/j.applthermaleng.2014.05.053

Cited by 18 publications

(9 citation statements)

References 10 publications

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“…Thus, the compensation of the measured temperature is indispensable to eliminate systematic errors caused by the thermal inertia of the thermocouple [9,13]. The compensated temperature is calculated by using the following equation:…”

Section: Data Reductionmentioning

confidence: 99%

“…The finding of these studies indicated that the use of oxy-fuel combustion in general regenerator systems reduced the thermal efficiency. The low efficiency has been attributed to the occurrence of enthalpy imbalance between the exhaust gas and the oxygen in the regenerator, unlike when airfuel combustion is employed [12,13].…”

Section: Introductionmentioning

confidence: 97%

“…For example, Hong et al [12] performed experiments on a lab-scale regenerator system that used oxy-fuel combustion. Kang et al [13] compared the numerical and experimental results obtained for a regenerator system that used oxy-fuel combustion. The finding of these studies indicated that the use of oxy-fuel combustion in general regenerator systems reduced the thermal efficiency.…”

Section: Introductionmentioning

confidence: 98%

“…When oxy-fuel combustion is employed, only oxygen is used instead of air and the amount of exhaust gas is 30% more than that amount of oxygen passing through the regenerator. This causes enthalpy imbalance between the exhaust gas and the oxygen in the regenerator [13]. Fig.…”

Section: Introductionmentioning

confidence: 99%

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Improvement in thermal efficiency of regenerator system by using oxy-fuel combustion

Hong

Noh

Lee

2015

Applied Thermal Engineering

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Section: Data Reductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improvement in thermal efficiency of regenerator system by using oxy-fuel combustion

Hong

Noh

Lee

2015

Applied Thermal Engineering

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“…Their results revealed that in addition to the chemistry profiles uniformity, the temperature profiles were also more uniform in the case of HiTAC configurations; no high gradients of temperatures were found. Kang et al [13] utilized the porous media module of the commercial software FLUENT to study the honeycomb regenerator of an oxy-fuel combustion furnace. The results were compared with experimental data.…”

Section: Introductionmentioning

confidence: 99%

Two Dimensional Thermal-Hydraulic Analysis for a Packed Bed Regenerator Used in a Reheating Furnace

2016

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Packed bed is widely used for different industries and technologies, such as heat exchangers, heat recovery, thermal energy storage and chemical reactors. In modern steel industry, packed bed regenerator is widely utilized in the reheating furnace to increase the furnace efficiency. This study established a two dimensional numerical model to simulate a packed bed used in regenerative furnaces. The physical properties of fluids and packed stuffing (such as density, thermal conductivity, and specific heat) are considered as functions of temperature to adapt the large temperature variation in operation. The transient temperature profiles of the flue gas, packed bed, and air during the heating and regeneration period are examined for various switching time (30, 60, 120, and 240 s). The results reveal that, during the heating period, the spanwise averaged heat transfer coefficient is decreased along the longitudinal downstream direction, while during the regeneration period, the opposite trend is true. Moreover, the regenerator thermal effectiveness is decreased by increasing the switching time.

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Interfacial Microstructure Evolution and Shear Strength of Titanium Sandwich Structures Fabricated by Brazing

Wang

Fan

et al. 2016

J. of Materi Eng and Perform

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The corrugated sandwich structure, consisting of a CP Ti (commercially pure titanium) core between two Ti-6Al-4V face sheets, was brazed using pasty Ti-37.5Zr-15Cu-10Ni as filler alloy, at the temperature of 870°C for 5, 10, 20, and 30 min. The effect of brazing time on the microstructure and elemental distribution of the brazed joints was examined by means of SEM, EDS, and XRD analyses. It was found that various intermetallic phases were formed in the brazed joints, following a brazing time of 5 min, and their contents were decreased by the increment of brazing time, while prolonged brazing time resulted in a fine, acicular Widmanstätten microstructure throughout the entire joint. In addition, shear testing was performed in the brazed corrugated specimens in order to indirectly assess the quality of the joints. The debonding between CP Ti and Ti-6Al-4V was observed in the specimen brazed for 5 min and the fracture of the CP Ti corrugated core occurred after 30 min of brazing time. Additionally, when brazed for 10 min or 20 min, brittle intermetallic compounds in the joints and the grain growth of the base metal were controllable. Therefore, the sandwich structures failed without debonding in the joints or fracture within the base metal, demonstrating a good combination of strength and ductility.

show abstract

Heat transfer characteristics of a ceramic honeycomb regenerator for an oxy-fuel combustion furnace

Cited by 18 publications

References 10 publications

Improvement in thermal efficiency of regenerator system by using oxy-fuel combustion

Improvement in thermal efficiency of regenerator system by using oxy-fuel combustion

Two Dimensional Thermal-Hydraulic Analysis for a Packed Bed Regenerator Used in a Reheating Furnace

Interfacial Microstructure Evolution and Shear Strength of Titanium Sandwich Structures Fabricated by Brazing

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