A review of metallic radiation recuperators for thermal exhaust heat recovery

Sharma, Harshdeep; Kumar, Anoop; Varun, _; Khurana, Sourabh

doi:10.1007/s12206-013-1186-4

Cited by 11 publications

(9 citation statements)

References 57 publications

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“…Recuperators are classified according to: their material: metallic or ceramic, dominant mode of heat transfer: convective, radiant, and combined (convection and radiation) recuperators, etc. Convective recuperators are well documented, whereas due to its commercial value and confidential nature of industry, little information is available in open literature on metallic recuperators [5]. Two types of radiant recuperators are frequently used: pipe-in-pipe, depicted in fig.…”

Section: Introductionmentioning

confidence: 99%

“…Two types of radiant recuperators are frequently used: pipe-in-pipe, depicted in fig. 1, and tubular or cage type recuperator [5]. The latter type is used for high pressures and consists of tubes, often removable, arranged on the large diameter circle.…”

Section: Introductionmentioning

confidence: 99%

“…Luzzato et al [7] presented a high temperature heat exchanger with the main heat transfer parts made out of ceramic matrix composite materials. Metallic radiant recuperators are built of high temperatures refractory steels and alloys of nickel, cobalt, and chromium [5,8,9]. To obtain good resistance to high temperature corrosion, erosion, and wear different coatings are used.…”

Section: Introductionmentioning

confidence: 99%

“…To obtain good resistance to high temperature corrosion, erosion, and wear different coatings are used. The examples of coatings are nickel base brazing filler alloy and highvelocity oxy-fuel thermal sprayed Cr 3 C 2 -NiCr [10], as cited by [5]. -Developing new designs.…”

Section: Introductionmentioning

confidence: 99%

“…-Developing new designs. The examples are recuperative burners [11,12], heat pipe recuperator [13] cited by [5], radiant recuperator with additional air passage that lowers excessive recuperator surface temperature and improves its effectiveness [14][15][16]. In the patent [16], the authors empirically recommended the ratio of the cross-sectional areas of the outer and the inner annular combustion air-circulating passages at 5:1 and stated that the ratio as small as 4:1 is acceptable, too.…”

Section: Introductionmentioning

confidence: 99%

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Radiant recuperator modelling and design

Knezevic¹,

Karamarković²,

Karamarkovic³

et al. 2017

THERM SCI

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Recuperators are frequently used in glass production and metallurgical processes to preheat combustion air by heat exchange with high temperature flue gases. Mass and energy balances of a 15 m high, concurrent radiant recuperator used in a glass fiber production process are given. The balances are used: for validation of a cell modeling method that predicts the performance of different recuperator designs, and for finding a simple solution to improve the existing recuperator. Three possible solutions are analyzed: to use the existing recuperator as a countercurrent one, to add an extra cylinder over the existing construction, and to make a system that consists of a central pipe and two concentric annular ducts. In the latter, two air streams flow in opposite directions, whereas air in the inner annular passage flows concurrently or countercurrently to flue gases. Compared with the concurrent recuperator, the countercurrent has only one drawback: the interface temperature is higher at the bottom. The advantages are: lower interface temperature at the top where the material is under maximal load, higher efficiency, and smaller pressure drop. Both concurrent and countercurrent double pipe-in-pipe systems are only slightly more efficient than pure concurrent and countercurrent recuperators, respectively. Their advantages are smaller interface temperatures whereas the disadvantages are their costs and pressure drops. To implement these solutions, the average velocities should be: for flue gas around 5 m/s, for air in the first passage less than 2 m/s, and for air in the second passage more than 25 m/s.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Radiant recuperator modelling and design

Knezevic¹,

Karamarković²,

Karamarkovic³

et al. 2017

THERM SCI

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Heat integration and operational optimization of an austenitization furnace using concentric‐tube radiant recuperators

et al. 2018

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This paper presents a model-based study of the impact of implementing radiant (radiation-dominated) concentric-tube recuperators on fuel use in an indirectly fired industrial heat treating (austenitization/quench hardening) furnace. The recuperators recover some of the waste heat from the burner exhaust to preheat the inlet air to the burners, thus reducing the amount of fuel required for combustion. The novelty of this work consists of developing a physics-based model of the recuperator, which captures local gas-to-surface convection and long-range surface-to-surface radiation interactions, and using the model to analyze and optimize the energy use of the furnace. An iterative algorithm is proposed to solve the poorly-conditioned energy balance equations. The steady-state system operation is optimized using surrogate models. Extensive simulation studies demonstrate that heat integration reduces fuel consumption significantly with no impact on product quality. keywordsRecuperator; Heat Integration; Austenitization; Energy efficiency; Furnace;

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