Exothermic Performance of the Calcined Limestone Determined by Exothermic Temperature under Fluidization during CaCO3/CaO Energy Storage Cycles

Fang, Yi; Zhao, Jianli; Zhang, Chunxiao; Li, Yingjie

doi:10.1007/s11630-023-1865-0

Cited by 5 publications

(2 citation statements)

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“…An effective solution is to integrate energy storage technology, i.e., storing excess thermal energy for later use . Calcium looping (CaL) technology utilizes the reaction of carbonation/calcination to store and release energy, with an energy storage density of up to 3.4 GJ/m. ,, The operation temperature of the CaL energy storage technology is high (800–900 °C), making it suitable for coupling with tower-type concentrated solar power plants. , Moreover, CaCO 3 is widely sourced from limestone, dolomite, or other industrial CaO-based solid waste materials …”

Section: Introductionmentioning

confidence: 99%

“…2,5,6 The operation temperature of the CaL energy storage technology is high (800−900 °C), making it suitable for coupling with tower-type concentrated solar power plants. 7,8 Moreover, CaCO 3 is widely sourced from limestone, 9 dolomite, 10 or other industrial CaObased solid waste materials. 11 The integration scheme of the CSP−CaL system is illustrated in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Calcium Looping Energy Storage Characteristics of Mn-Impregnated Limestone in Fluidization under Direct Solar Irradiation

Fang,

Li,

Zhang

et al. 2024

Energy Fuels

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The directly irradiated reactor is suitable for the solar calciner in calcium looping energy storage technology. However, the low optical absorption performance of CaCO 3 is disadvantageous for its decomposition under direct irradiation. In this work, a directly irradiated fluidized-bed reactor was designed for calcium looping energy storage. The top of the fluidized-bed reactor can receive the simulated solar irradiation from the xenon lamp with a maximum irradiation intensity of 260 kW/m 2 . The energy storage characteristics of CaCO 3 under fluidization and static conditions were compared. The effect of the irradiation intensity on the solar−thermal conversion efficiency was investigated. Furthermore, the energy storage characteristics of Mn-impregnated CaCO 3 were also studied. The results indicate that direct irradiation leads to a high temperature difference in the bed. The temperature difference in the fluidization state is 30% lower than that under the static condition. Increasing the irradiation intensity enhances the decomposition efficiency of CaCO 3 . However, a high radiation efficiency exacerbates irradiation reflection, reducing the solar−thermal conversion efficiency. Mn impregnation enhanced the optical absorption performance of CaCO 3 . The optical absorbance of Mn-impregnated CaCO 3 with a CaCO 3 /Mn mass ratio of 100:3 is 0.83, which is 6 times higher than that of CaCO 3 . The solar−thermal conversion efficiency of Mnimpregnated CaCO 3 increases by 25% compared with CaCO 3 at 200 kW/m 2 . This work further promotes the application of directly irradiated fluidized-bed reactors in calcium loop energy storage.

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