PCM-based energy recovery from electric arc furnaces

Nardin, Gioacchino; Meneghetti, Antonella; Magro, Fabio Dal; Benedetti, Nicole

doi:10.1016/j.apenergy.2014.07.052

Cited by 77 publications

(42 citation statements)

References 10 publications

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“…In the final and most comprehensive step of Case 5, both the pressure of the intermediate steam [41]). The steam is condensed and subcooled to 90 • C. The minimum pinch point temperature difference between the flue gas and the intermediate steam loops is fixed at 5 • C. The net power output in this case is further reduced to 381 kWe.…”

Section: Simulation Results For the Five Investigated Casesmentioning

confidence: 99%

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Case Study of an Organic Rankine Cycle (ORC) for Waste Heat Recovery from an Electric Arc Furnace (EAF)

et al. 2017

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The organic Rankine cycle (ORC) is a mature technology for the conversion of waste heat to electricity. Although many energy intensive industries could benefit significantly from the integration of ORC technology, its current adoption rate is limited. One important reason for this arises from the difficulty of prospective investors and end-users to recognize and, ultimately, realise the potential energy savings from such deployment. In recent years, electric arc furnaces (EAF) have been identified as particularly interesting candidates for the implementation of waste heat recovery projects. Therefore, in this work, the integration of an ORC system into a 100 MWe EAF is investigated. The effect of evaluations based on averaged heat profiles, a steam buffer and optimized ORC architectures is investigated. The results show that it is crucial to take into account the heat profile variations for the typical batch process of an EAF. An optimized subcritical ORC system is found capable of generating a net electrical output of 752 kWe with a steam buffer working at 25 bar. If combined heating is considered, the ORC system can be optimized to generate 521 kWe of electricity, while also delivering 4.52 MW of heat. Finally, an increased power output (by 26% with combined heating, and by 39% without combined heating) can be achieved by using high temperature thermal oil for buffering instead of a steam loop; however, the use of thermal oil in these applications has been until now typically discouraged due to flammability concerns.

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Section: Simulation Results For the Five Investigated Casesmentioning

confidence: 99%

“…This allowed them to design an optimized heat exchanger configuration. Nardin et al [41] investigated the use of phase change materials (PCM) to smoothen the off-gas temperature. They also proposed to implement cyclones in the actual waste heat recovery unit (WHRU) to overcome the problem of the high dust content.…”

Section: Introductionmentioning

confidence: 99%

Case Study of an Organic Rankine Cycle (ORC) for Waste Heat Recovery from an Electric Arc Furnace (EAF)

et al. 2017

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“…A possible solution to smooth the variability of waste gas temperature is to exploit aluminium as a phase change material (PCM) [6]. The PCM device designed in [6] is formed by a set of PCM systems, in which aluminium is encapsulated in a steel cylinder in direct contact with the surrounding waste gas.…”

Section: Introductionmentioning

confidence: 99%

“…The PCM device designed in [6] is formed by a set of PCM systems, in which aluminium is encapsulated in a steel cylinder in direct contact with the surrounding waste gas. The PCM systems are vertically aligned and hung to the rooftop of the settling chamber by an appropriate hooking system (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Thermal stress analysis of PCM containers for temperature smoothing of waste gas

Magro

Benasciutti

Nardin

2016

Applied Thermal Engineering

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“…Nardin et al [8] investigated the performance of aluminium as phase change materials to smooth the off-gas temperatures from the electric arc furnace process of steel industry for energy recovery purposes. They found out that the variation of the off gas temperature is significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of phase change materials thermal capacitor for pipe flow

Kurnia

Sasmito

2017

MATEC Web Conf.

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Abstract. This study addresses the performance of phase change material as thermal capacitor. A computational fluid dynamics (CFD) model is developed to take into account the conjugate heat transfer between water as the heat transfer fluid (HTF) and PCM as thermal capacitor. A pulsating inlet temperature with constant inlet velocity is prescribed to represent temperature variation. The performance of thermal capacitor is evaluated by closely monitoring outlet temperature and comparing it with inlet temperature to examine the reduction in temperature fluctuation. To intensify heat transfer between HTF and PCM, extended surfaces (fins) are installed on PCM side. The results indicate that PCM thermal capacitor can reduce temperature fluctuation by ~ 1 C. This reduction can be improved further when extended surface is installed with ~ 1.5 C reduction in temperature fluctuation is achieved. Moreover, it is found that the maximum temperature is delayed at the outlet due to slow conjugate heat transfer between HTF and PCM. Inlet velocity is found to have considerable influence of the temperature fluctuation reduction: Slower inlet velocity results in a better temperature fluctuation reduction. This study is expected to serve as a guideline in designing PCM-based thermal capacitor.

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PCM-based energy recovery from electric arc furnaces

Cited by 77 publications

References 10 publications

Case Study of an Organic Rankine Cycle (ORC) for Waste Heat Recovery from an Electric Arc Furnace (EAF)

Case Study of an Organic Rankine Cycle (ORC) for Waste Heat Recovery from an Electric Arc Furnace (EAF)

Thermal stress analysis of PCM containers for temperature smoothing of waste gas

Numerical investigation of phase change materials thermal capacitor for pipe flow

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