Slag as an inventory material for heat storage in a concentrated solar tower power plant: Experimental studies on design and performance of the thermal energy storage

Haunstetter, Jürgen; Krüger, Michael; Zunft, Stefan

doi:10.1063/1.5117737

Cited by 7 publications

(9 citation statements)

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“…The lead concept was already examined in detail by Haunstetter et al in [24]. The results obtained indicated the applicability of steelmaking slag as a TES inventory material.…”

Section: Nu = F a Nu Particlementioning

confidence: 89%

“…For experiments, the inner storage tank can be changed to test different designs of TES. The main technical details of the pilot plant are listed in Figure 4 [24]. For the test campaign, the inner storage tank is equipped with an inner insulation and filled with 4.85 tons of slag pellets, see Figure 4b.…”

Section: Tes Pilot Plant Set Upmentioning

confidence: 99%

“…For the evaluation, the mean level temperature values are used. The TCs have a specified accuracy of 1.5 K [24]. The air compressor is a speed-controlled screw compressor with a rated motor power of 90 kW.…”

Section: Tes Pilot Plant Set Upmentioning

confidence: 99%

“…For experiments, the inner storage tank can be changed to test different designs of TES. The main technical details of the pilot plant are listed in Figure 4 [24].…”

Section: Tes Pilot Plant Set Upmentioning

confidence: 99%

“…Table 1. Operation specifications for a 150 MWel CSP plant (a) and used slag parameter (b) [27]. Krüger et al [22] applied management tools normally used in production development in order to identify a lead concept.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Studies on Thermal Performance and Thermo-Structural Stability of Steelmaking Slag as Inventory Material for Thermal Energy Storage

Haunstetter¹,

Krüger²,

Zunft³

2020

Applied Sciences

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Thermal energy storage (TES) systems are key components for concentrated solar power plants to improve their dispatchability and for shifting the energy production efficiently to high revenue periods. The commercial state of the art is the molten salt two tank storage technology. However, this TES confronts some issues like freezing and decomposition, which require continued technical attention. Furthermore, the molten salt itself is very expensive compared to other storage materials. A TES option that possesses a high cost reduction potential and the ability to increase the whole power plant efficiency is the regenerator-type energy storage. Here, a packed bed inventory of waste metallurgical slag from electric arc furnace (EAF) can achieve further cost reduction. Despite previous studies regarding the use of steelmaking slag as an inventory material for thermal energy storages, there are still basic questions to be answered. This work presents experimental thermal performance and thermo-structural stability studies of slag-based TES, obtained during the European project REslag. The EAF slag and different insulation options were tested for their thermomechanical strength in a uniaxial compression test rig. The thermal cyclic behavior was investigated in a pilot TES plant with temperatures up to 700 °C. The experimental results confirm the suitability of steelmaking slag as thermal energy storage inventory material. Furthermore, a comparison of experimental and simulation model results shows an agreement of over 90%.

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“…The lead concept was already examined in detail by Haunstetter et al in [24]. The results obtained indicated the applicability of steelmaking slag as a TES inventory material.…”

Section: Nu = F a Nu Particlementioning

confidence: 89%

Section: Tes Pilot Plant Set Upmentioning

confidence: 99%

Section: Tes Pilot Plant Set Upmentioning

confidence: 99%

“…For experiments, the inner storage tank can be changed to test different designs of TES. The main technical details of the pilot plant are listed in Figure 4 [24].…”

Section: Tes Pilot Plant Set Upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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