Simultaneous CO2 capture and heat storage by a Ca/Mg-based composite in coupling calcium looping and CaO/Ca(OH)2 cycles using air as a heat transfer fluid

The problem of emulsification between Phase Change Material (PCM) and Heat Transfer Fluid (HTF) in direct contact latent heat storage systems has been reported in various studies. This issue causes the PCM to flow out of the storage tank and crystallize at unwanted locations and thus presents a major limitation for the proper operation of such systems. These anomalies become more pronounced when high HTF flow rates are employed with the aim to achieve fast heat transfer rates. The goal of this paper is to find a method which will enable the fast separation of the formed emulsion and thus the uninterrupted operation of the storage unit. In this study, three separation methods were examined and the use of superhydrophobic filters was chosen as the best candidate for the demulsification of the PCM and HTF mixtures. The filter was produced by processing of a melamine sponge with different superhydrophobic adhesives and was tested with emulsions closely resembling the ones formed in a real direct contact setup. The superhydrophobic filter obtained, was able to separate the emulsions effectively while presenting a very high permeability (up to 1,194,980 kg h−1 m−2 bar−1). This is the first time the use of a superhydrophobic sponge has been investigated in the context of demulsification in direct contact latent heat storage.

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CO2 capture by a novel CaO/MgO sorbent fabricated from industrial waste and dolomite under calcium looping conditions

New Journal of Chemistry ◽

10.1039/c8nj06257a ◽

2019 ◽

Vol 43 (13) ◽

pp. 5116-5125 ◽

Cited By ~ 9

Author(s):

Xianyao Yan ◽

Yingjie Li ◽

Xiaotong Ma ◽

Jianli Zhao ◽

Zeyan Wang ◽

...

Keyword(s):

Co2 Capture ◽

Industrial Waste ◽

Cyclic Stability ◽

Calcium Looping ◽

Carbide Slag ◽

Porous Microstructure ◽

Capture Capacity

A synthetic sorbent prepared from carbide slag and dolomite by combustion exhibits high CO2 capture capacity, good cyclic stability and a porous microstructure.

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CO2 capture using carbide slag modified by propionic acid in calcium looping process for hydrogen production

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2013.08.030 ◽

2013 ◽

Vol 38 (31) ◽

pp. 13655-13663 ◽

Cited By ~ 36

Author(s):

Rongyue Sun ◽

Yingjie Li ◽

Jianli Zhao ◽

Changtian Liu ◽

Chunmei Lu

Keyword(s):

Hydrogen Production ◽

Propionic Acid ◽

Co2 Capture ◽

Calcium Looping ◽

Carbide Slag

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Numerical Investigation of Combined Sensible/Latent Heat Thermal Energy Storage With Supercritical Carbon Dioxide As Heat Transfer Fluid at 650°C

Volume 6: Energy ◽

10.1115/imece2019-10606 ◽

2019 ◽

Author(s):

Kelly Osterman ◽

Diego Guillen ◽

D. Yogi Goswami

Keyword(s):

Heat Transfer ◽

Carbon Dioxide ◽

Energy Storage ◽

Supercritical Carbon Dioxide ◽

Thermal Energy ◽

Thermal Energy Storage ◽

Heat Storage ◽

Storage System ◽

Heat Transfer Fluid ◽

Dry Air

Abstract This paper numerically explores a high-temperature sensible-latent hybrid thermal energy storage system designed to store heat with output temperatures stabilized at approximately 550–600 °C for direct coupling with supercritical carbon dioxide (sCO2) power cycles operating at their design point. sCO2 and dry air at 25 MPa are used as heat transfer fluid (HTF) in a packed bed storage system that combines rocks as sensible heat storage and AlSi12 as latent heat storage. The base model using dry air at atmospheric pressure is compared to similar work done at ETH Zurich; the model is then extended for use with sCO2 to compare the performance of air and sCO2 at similar volumetric flow rates. It was found that sCO2 is capable of storing a significantly larger amount of energy (∼40 kWh) in the same time period as the air system (∼19 kWh), and can discharge that energy much quicker (1.5 hours compared to 4 hours). However, in order to achieve similar degrees of temperature stabilization, the total height of PCM had to be increased significantly, from 9 cm to 45 cm or more.

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Towards development of a prototype high-temperature latent heat storage unit as an element of a RES-based energy system (part 2)

Bulletin of the Polish Academy of Sciences Technical Sciences ◽

10.1515/bpasts-2016-0045 ◽

2016 ◽

Vol 64 (2) ◽

pp. 401-408

Author(s):

J. Karwacki ◽

K. Bogucka-Bykuć ◽

W. Włosiński ◽

S. Bykuć

Keyword(s):

Heat Transfer ◽

Experimental Study ◽

Energy Storage ◽

Thermal Energy ◽

Thermal Energy Storage ◽

Heat Storage ◽

Heat Transfer Fluid ◽

Storage Unit ◽

Latent Heat Storage ◽

Shell And Tube

Abstract This paper presents an experimental study performed with the general aim of defining procedures for calculation and optimization of shell-and-tube latent thermal energy storage unit with metals or metal alloys as PCMs. The experimental study is focused on receiving the exact information about heat transfer between heat transfer fluid (HTF) and phase change material (PCM) during energy accumulation process. Therefore, simple geometry of heat transfer area was selected. Two configurations of shell-and-tube thermal energy storage (TES) units were investigated. The paper also highlights the emerging trend (reflected in the literature) with respect to the investigation of metal PCM-based heat storage units in recent years and shortly presents unique properties and application features of this relatively new class of PCMs.

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PENGGUNAAN PARAFFIN WAX SEBAGAI PENYIMPAN KALOR PADA PEMANAS AIR TENAGA MATAHARI THERMOSYPHON

ROTASI ◽

10.14710/rotasi.18.3.76-85 ◽

2016 ◽

Vol 18 (3) ◽

pp. 76 ◽

Cited By ~ 1

Author(s):

Muhammad Nadjib

Keyword(s):

Heat Transfer ◽

Energy Storage ◽

Thermal Energy ◽

Thermal Energy Storage ◽

Heat Storage ◽

Paraffin Wax ◽

Heat Transfer Fluid ◽

Sensible Heat ◽

Latent Heat Storage ◽

Change Material

Pemanas Air Tenaga Matahari (PATM) konvensional umumnya menggunakan air sebagai penyimpan energi termal. Pemakaian sensible heat storage (SHS) ini memiliki kekurangan, diantaranya adalah densitas energinya rendah. Di sisi lain, latent heat storage (LHS) mempunyai sifat khas yaitu densitas energinya tinggi karena melibatkan perubahan fasa dalam penyerapan atau pelepasan kalor. Material LHS sering disebut phase change material (PCM). Penggunaan PCM pada PATM menarik dilakukan untuk meningkatkan densitas energi sistem. Penelitian ini bertujuan untuk menyelidiki perilaku termal penggunaan paraffin wax di dalam tangki PATM jenis thermosyphon. Penelitian menggunakan kolektor matahari pelat datar dan tangki thermal energy storage (TES) yang dipasang secara horisontal di sisi atas kolektor. Di dalam tangki terdapat alat penukar kalor yang terdiri dari sekumpulan pipa kapsul dimana di dalamnya berisi paraffin wax. Air digunakan sebagai SHS dan heat transfer fluid (HTF). Termokopel dipasang di sisi HTF dan sisi PCM. Piranometer dan sensor temperatur udara luar diletakkan di dekat kolektor matahari. Pengambilan data dilakukan selama proses charging. Temperatur HTF, PCM dan intensitas radiasi matahari direkam setiap 30 detik. Data ini digunakan untuk mengetahui evolusi temperatur HTF dan PCM. Berdasarkan evolusi temperatur ini kemudian dianalisis perilaku termal PATM. Hasil dari penelitian ini adalah bahwa paraffin wax telah berfungsi sebagai penyimpan energi termal bersama air di dalam tangki PATM jenis thermosyphon. PCM memberi kontribusi yang cukup signifikan terhadap kapasitas penyimpanan energi sistem. Efisiensi kolektor lebih optimal karena PCM dapat mempertahankan stratifikasi termal sampai akhir charging. Adanya PCM mampu mengendalikan penurunan efisiensi pengumpulan energi saat intensitas radiasi matahari menurun. Alat penukar kalor yang digunakan cukup efektif yang ditandai dengan kecepatan pemanasan rata-rata antara HTF dan PCM yang tidak berbeda jauh.

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