Silica dopant effect on the performance of calcium carbonate/calcium oxide based thermal energy storage system
IF 1.1
4区 工程技术
Q4 THERMODYNAMICS
引用次数: 0
Abstract
CaCO3 is being studied for its application in thermal energy storage. However, it has drawbacks of slow reaction rate during calcination and incomplete reversible carbonation which limit its use. In this paper, SiO2 has been studied as a dopant for CaCO3 to improve its cyclic performance. CaCO3 samples were loaded with different concentrations of SiO2 and its effect on the thermal energy density of CaCO3 was determined. Afterwards, the effect of the dopant on the heat storage process of the synthesized composite along with kinetics of decarbonation reaction was investigated. Cyclic tests were performed to determine the reusability of the material. It was found that the addition of dopant helped to increase the rate of decarbonation reaction, thereby making the heat storage process more efficient as compared to pure CaCO3. The activation energy values are 255.9, 280.1, 244.9 and 234.8 kJ/mol for 5%, 15%, 30% and 0% doped SiO2 samples, respectively. Furthermore, thermal energy storage density increases when the amount of dopant decreases in the samples such as the 30% and 5% doped samples have gravimetric energy storage densities of 339.85 and 759.24 J/g, respectively. It was observed that the large quantities (15% and 30%) of dopant had introduced a new phase of Ca3SiO5 during CaCO3 decomposition.二氧化硅掺杂对碳酸钙/氧化钙基储能系统性能的影响
目前正在研究CaCO3在储热方面的应用。但其煅烧反应速度慢、碳酸化不完全可逆等缺点限制了其应用。本文研究了SiO2作为CaCO3的掺杂剂来改善CaCO3的循环性能。在CaCO3样品中加入不同浓度的SiO2，考察其对CaCO3热能量密度的影响。然后，研究了掺杂剂对合成复合材料蓄热过程的影响以及脱碳反应动力学。进行循环试验以确定材料的可重复使用性。研究发现，掺杂剂的加入有助于提高脱碳反应的速率，从而使储热过程比纯CaCO3更有效。掺入5%、15%、30%和0% SiO2样品的活化能分别为255.9、280.1、244.9和234.8 kJ/mol。此外，随着掺杂量的减少，热储能密度增大，如掺杂30%和5%的样品的重量储能密度分别为339.85和759.24 J/g。观察到大量(15%和30%)的掺杂剂在CaCO3分解过程中引入了新的Ca3SiO5相。
本文章由计算机程序翻译，如有差异，请以英文原文为准。
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来源期刊
Thermal Science
工程技术-热力学
CiteScore
2.70
自引率
29.40%
发文量
399
审稿时长
5 months
期刊介绍：
The main aims of Thermal Science
to publish papers giving results of the fundamental and applied research in different, but closely connected fields:
fluid mechanics (mainly turbulent flows), heat transfer, mass transfer, combustion and chemical processes
in single, and specifically in multi-phase and multi-component flows
in high-temperature chemically reacting flows
processes present in thermal engineering, energy generating or consuming equipment, process and chemical engineering equipment and devices, ecological engineering,
The important characteristic of the journal is the orientation to the fundamental results of the investigations of different physical and chemical processes, always jointly present in real conditions, and their mutual influence. To publish papers written by experts from different fields: mechanical engineering, chemical engineering, fluid dynamics, thermodynamics and related fields. To inform international scientific community about the recent, and most prominent fundamental results achieved in the South-East European region, and particularly in Serbia, and - vice versa - to inform the scientific community from South-East European Region about recent fundamental and applied scientific achievements in developed countries, serving as a basis for technology development. To achieve international standards of the published papers, by the engagement of experts from different countries in the International Advisory board.
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