Waste Heat Recovery from Metal Casting and Scrap Preheating Using Recovered Heat

Selvaraj, Jeyraj; Varun, V. Sai; Vignesh,; Vishwam, Vishnu

doi:10.1016/j.proeng.2014.12.250

Cited by 14 publications

(8 citation statements)

References 8 publications

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“…To calculate the heating rate of the raw material, the energy balance is imposed, Eq. (11). The internal energy variation of the raw glass is equal to the variation of the thermal heat flow through the system.…”

Section: Analitical Modelmentioning

confidence: 99%

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CFD Modelling of Regenerative Pre-heating Systems for Recycled Glass Raw Material

Leutcha¹,

Cravero²

2019

IJES

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The glass production industry has one of the highest energy consumption rates and environmental emission impact with respect to the existing industrial sectors. Moreover, the glass production sector is important in Italy (with production plants spread all over the country from North to South) from both production rates and engineering design and development competencies point of view. The glass furnaces are nowadays conceived with regenerative or recuperative systems to take advantage of the residual heat from the combustion exhausts in order to increase the thermal efficiency of the system. The exhaust gases are also used in innovative systems to reduce the NOx emissions in specifically designed gas recirculation systems tailored to the glass furnace. A remaining portion of the heat content in the exhaust gases could be used to pre-heat the raw material from recycled glass that, in some applications, forms a significant percentage of the glass recipe. In order to develop pre-heating systems for recycled glass as compact as possible, a detailed analysis of the heat transfer from the gases to the glass need to be developed. In the paper different CFD models for the heating process of recycled glass are presented. A numerical model for the recycled glass loose particles has been developed and used in the CFD models for both direct (the exhaust gases flow through the recycled glass matrix) and indirect (the recycled glass is heated through heat diffusion from the hot gases that flow into pipes) systems.

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Section: Analitical Modelmentioning

confidence: 99%

“…Since the 1960 several glass raw material pre-heating systems have been patented [8][9][10]. In the foundries pre-heating systems for scrap material have been studied using the heat of the waste gases [11]. Similar pre-heating systems of the scrap are used in the steelmaking process [12].…”

Section: Introductionmentioning

confidence: 99%

CFD Modelling of Regenerative Pre-heating Systems for Recycled Glass Raw Material

Leutcha¹,

Cravero²

2019

IJES

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“…Preheating scrap steel is one of the important ways to increase the scrap steel ratio. Previous research has explored methods of preheating scrap steel, including hot flue gas preheating [9], barrel preheating [10], industrial electric arc furnace burner preheating [11,12], and metal casting preheating [13].…”

Section: Introductionmentioning

confidence: 99%

Study on Heat Transfer Process between High-Temperature Slag Particles and Scrap in Drum Based on DEM Method

Fan,

Su,

Zhao

et al. 2024

Processes

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Blast furnace slag, a by-product of the iron and steel production process, contains a significant amount of untapped heat resources. Currently, China is entering a period of rapid growth in scrap production, making efficient scrap utilization a new research focus. One approach to improving scrap utilization is preheating. This study proposes a new method of preheating scrap using high-temperature slag in a drum. The discrete element method is employed for numerical simulation, which involves constructing a three-dimensional model. The study explores three influencing factors: the mass ratio of high-temperature slag to scrap, the shape of the scrap, and the drum rotational speed. The main objective is to investigate the heat transfer situation between the high-temperature slag and the scrap. The results indicate that the optimal heat transfer effect in the drum is achieved when the mass ratio of high-temperature slag to scrap is 2:1, the scrap is spherical in shape, and the drum rotational speed is 12 rpm.

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“…Several industrial sectors, like steel or cement production, have raw material preheating systems [10] and a specific research activity has been performed to test the strategy for glass raw material [11].…”

Section: Introductionmentioning

confidence: 99%

The Use of Uncertainty Quantification and Numerical Optimization to Support the Design and Operation Management of Air-Staging Gas Recirculation Strategies in Glass Furnaces

Domenico

Cravero

2023

Fluids

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The reduction in energy consumption and the increasingly demanding emissions regulations have become strategic challenges for every industrial sector. In this context, the glass industry would be one of the most affected sectors due to its high energy demand and emissions productions, especially in terms of NOx. For this reason, various emission abatement systems have been developed in this field and one of the most used is the air staging system. It consists in injecting air into the upper part of the regenerative chamber on the exhaust gases side in order to create the conditions for combustion that reduces NOx emissions. In this work, the combined use of CFD with data analysis techniques offers a tool for the design and management of a hybrid air staging system. Surrogate models of the bypass mass flow rate and uniformity index in the regenerative chamber have been obtained starting from DoE based on different simulations by varying the air mass flow rate of the two injectors located in a bypass duct that connects the two regenerative chambers. This model allows a UQ analysis to verify how the uncertainty of the air injectors can affect the bypass mass flow rate. Finally, an optimization procedure has identified the optimal condition for the best bypass mass flow rates and uniformity of the oxygen concentration in the chamber. High values of the mass flow rate of the pros injector and medium-low values for the cons injectors are identified as operating parameters for best conditions.

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Waste Heat Recovery from Metal Casting and Scrap Preheating Using Recovered Heat

Cited by 14 publications

References 8 publications

CFD Modelling of Regenerative Pre-heating Systems for Recycled Glass Raw Material

CFD Modelling of Regenerative Pre-heating Systems for Recycled Glass Raw Material

Study on Heat Transfer Process between High-Temperature Slag Particles and Scrap in Drum Based on DEM Method

The Use of Uncertainty Quantification and Numerical Optimization to Support the Design and Operation Management of Air-Staging Gas Recirculation Strategies in Glass Furnaces

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