共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
利用傅利叶变温红外光谱仪分别测定了新戊二醇(NPOG)、季戊四醇(PE)及其二元混合物的变温红外光谱。实验表明,多元醇分子中羟基吸收峰随温度升高而发生位移,它既能反映多元醇及其二元体系发生固-固相变的温度区间,又与转变热相对应,从而揭示了多元醇及其二元体系固-固相变贮热的机理。 相似文献
4.
5.
6.
新戊二醇,季戊四醇及其二元体系固—固相变贮热的动力学研究 总被引:3,自引:1,他引:2
利用DSC技术研究了新戊二醇(NPG)、季戊四醇(PE)及其二元体系的固-固相变的动力学,运用Kissinger及Ozawa方法计算了固-固相变的表观活化能及反应级数,两种方法的结果是一致的。 相似文献
7.
锂硫电池(Li-S)理论能量密度高,且硫资源在地壳中分布丰富,被认为是最有前途的二次电池之一。传统液态锂硫电池中硫正极经历“固-液-固”转化反应,在充放电过程会产生可溶性多硫化物,引发溶解穿梭效应,导致活性材料损失和循环寿命不足等问题。“固-固”转化反应的硫正极可以避免长链多硫化物的溶解,从根本上解决穿梭问题。本文详细介绍了在硫正极实现“固-固”转化反应的不同策略及研究进展,分别对微孔结构限硫、有机聚合物共价键固硫、有机/无机杂化协同固硫等策略进行了机理探讨、优化方法总结和未来挑战分析。之后阐述了与上述固固转化反应硫正极匹配的固体电解质,并简要介绍了“准固态”转化的研究策略,最后对构建高能量密度锂硫电池提出了展望。 相似文献
8.
10.
11.
三羟甲基乙烷、新戊二醇及其二元体系相变动力学的DSC研究 总被引:6,自引:2,他引:4
用DSC技术研究了新戊二醇(NPG),三羟甲基乙烷(PG)及其二元体系的固-固,固-液相变的动力学,运用Kissinger及Ozawa方法计算了相变过程的活化能及反应级数,两种方法计算结果一致,固-固相变温度和峰温与升温速度呈线性关系。 相似文献
12.
13.
与传统锂离子电池相比,基于无机固体电解质的全固态锂电池,具有安全性能高、循环寿命长、能量密度高等优点,是目前锂电池研究领域的热点之一,未来有望在电动汽车和智能电网等领域得到广泛应用。全固态锂电池中,电极与固体电解质之间的固固接触相比固液接触具有更高的界面接触电阻,同时,界面相容性和稳定性也显著影响全固态锂电池的循环性能和倍率性能。而在固体电解质中,晶界电阻决定了电解质整体的离子电导率,因此,界面问题是决定电池电化学性能的关键所在。本文重点综述了全固态锂电池中各种界面问题的研究现状,主要包括界面调控机理、修饰方法,并指出全固态锂电池中界面调控面临的挑战。 相似文献
14.
为研究叶片包角对高比转速离心泵固液两相流动的影响,采用Mixture多相流模型,利用CFX软件对5种不同叶片包角的高比转速离心泵进行了固液两相湍流数值模拟,分析了固液两相流中固体体积分数分布及速度变化规律。研究表明:在2%的泥沙含量条件下,随着叶片包角的增加,效率有所下降,叶片包角φ=100°时效率最优;颗粒主要分布在叶轮后盖板及叶片背面尾部;固体速度在距后盖板的0.7位置及叶片头部位置达到最大;随着包角的增大,叶轮流道内的压力在减小,后盖板、叶片背面尾部的颗粒浓度明显降低,流道和叶片上的固体速度会增加;颗粒浓度下降速度快慢的临界点在距离后盖板0.15处;叶片背面颗粒浓度的峰值点出现在叶片长度为0.9处,此时,φ=110°时的颗粒含量受到包角的影响最大;综合颗粒体积分数及固相速度的分布规律,适当增大叶片包角使得效率降低,但可改善固液两相流离心泵后盖板及叶片背面磨损情况。 相似文献
15.
16.
In the present work a theoretical model of a solid oxide electrolyzer based on an electrolyte having both oxygen ion and proton conductivity is considered. The main parameters of the electrolytic process and an electrolyzer (distribution of gas components, electromotive forces and current densities along the electrolyzer channel, average values of electromotive forces and current densities) were calculated depending on a proton transport number and mode of the reactants’ feeding (co- and counter-flow). The performed analysis demonstrates considerable influence of the mode of feeding on all parameters of the electrolyzer: operation under the counter-flow mode is preferable as regards the specific characteristics and uniformity of their distribution along the electrolyzer. It is shown that the electrolyser's specific characteristics increase with the increase of the proton transport number. 相似文献
17.
This paper presents the results of pyrolysis experiments of the mixtures of nine different combustibles municipal solid wastes (MSW's main composition: rice 24.33% and fruits 14.60%). The experiments were carried out in a laboratory‐scale reactor under nitrogen atmosphere at temperature of 300–700°C. The study concentrates on low‐temperature pyrolysis of MSWs and the effect of the pyrolysis temperature on the characteristics of the products (solid fuels) including proximate analysis, volatile content, heating value, ignition temperature and density of the solid fuel. The results indicate that the pyrolysis temperature plays an important role on the characteristics of the solid fuels. The volatile content of the solid fuels decreases with the pyrolysis temperature so that the low‐pyrolysis MSW treating process has advantage for higher heating value of the solid fuel for energy recovery purpose. The heating value is in the range of 23–27 MJ kg?1, equivalent to the heating value of low‐rank coals. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
18.
19.
20.
In this paper, the analysis of silica gel formed in a staggered tube bank arrangement for the reduction of energy consumption in a heat pump dehumidifier is presented. The mathematical models for the desiccant and the heat pump have been developed. The simulated results agree quite well with those of the experiments. The desiccant could reduce the heat pump load by about 7–20 per cent at the inlet air conditions of about 30–50°C and 70–90 per cent RH. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献