化工学报 ›› 2011, Vol. 62 ›› Issue (S1): 197-202.

• 能源和环境工程 • 上一篇    下一篇

混合碳酸盐的DSC测量与比热容分析

任楠,王涛,吴玉庭,马重芳   

  1. 北京工业大学环境与能源工程学院,教育部传热强化与过程节能重点实验室, 北京 100124
  • 出版日期:2011-07-03 发布日期:2011-07-03

  • Online:2011-07-03 Published:2011-07-03

摘要:

混合熔盐由于具备大热容量、低成本、低蒸气压、低黏度、宽使用温度范围等优点,目前已成为公认的颇具潜力的传热蓄热介质。为了满足太阳能高温传热蓄热的要求,本文按照不同混合比例配制了36种三元混合碳酸盐(碳酸钾-碳酸锂-碳酸钠)。采用差示扫描量热法和热重法测量了混合熔盐的熔点、分解温度和比热容,并拟合了比热容与温度的函数关系式。实验结果表明,三元混合碳酸盐的熔点基本保持在400℃左右,分解温度在800850℃范围内,部分熔盐的分解温度高达900℃;测量时应注意熔盐在冷却过程中出现的部分组分偏析的现象;多数混合熔盐的比热容与温度的四次多项式拟合良好。

关键词: 混合碳酸盐;传热蓄热;熔点;FONT-SIZE: 10.5pt, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast"> FONT-SIZE: 10.5pt, mso-ascii-font-family: Calibri, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast">比热容

Abstract:

Mixed molten salt, with large heat capacity, low cost, low vapor pressure, low viscosity, wide using temperature range and so on, has become recognized as a considerable regenerative potential of the heat transfer medium.36 kinds of mixed carbonate molten salts were prepared by mixing potassium carbonate, lithium carbonate, sodium carbonate in accordance with different proportions.The melting point, decomposition temperature, and specific heat are measured by the analysis of the TGA and DSC curves.In addition, the fitting curves of specific heat are obtained.The results show that melting points of major ternary carbonate are close at around 400 and decomposition temperatures of most ternary carbonate are 800850.Decomposition temperatures of some ternary carbonate are 900.During the measurement, it is necessary to pay attention to the phenomenon of segregation of some components in the cooling process.The specific heats of most carbonates fitted with quartic polynomial of temperature very well.

Key words: 混合碳酸盐;传热蓄热;熔点;FONT-SIZE: 10.5pt, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-fareast-font-family: 宋体, mso-hansi-font-family: 宋体, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast"> FONT-SIZE: 10.5pt, mso-ascii-font-family: Calibri, mso-bidi-font-family: 宋体, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-bidi-font-size: 11.0pt, mso-ascii-theme-font: minor-latin, mso-fareast-theme-font: minor-fareast">比热容