共查询到19条相似文献,搜索用时 281 毫秒
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为考察熔融盐对粗合成气成份的影响,在固定床内进行了熔融盐粗燃气成份调整实验。在350~500℃温度范围内,考察了温度、流速、挡板开孔直径、气泡停留时间等操作条件对粗燃气成份的影响。研究结果表明,所有实验工况下,熔融盐均能有效的吸收粗燃气中的CO2,得到的合成气中CO2体积分数在2%附近,熔融盐处理技术能有效增加合成气中H2体积分数,降低CO体积分数,改善合成气品质。温度、流速、气泡停留时间对H2和CO的体积分数影响明显。熔融盐粗燃气成份调整适合作为气化、热解制备合成气的后续工艺,提升燃气品质。 相似文献
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熔融盐粗燃气调质实验研究 总被引:1,自引:0,他引:1
在固定床内进行了熔融盐粗燃气成份调质实验,对熔融盐粗燃气调质实验的运行稳定性、反应过程对熔融盐的物性变化的影响、粗合成气成份对调质实验的影响等问题进行了考察.结果分析表明,350~500℃所有实验工况下,熔融盐均能有效的吸收粗燃气中的CO2,得到的合成气中CO2体积分数在2%附近,熔融盐处理技术能有效增加合成气中H2体积分数,降低CO体积分数,连续运行11h后合成气成份仍相对稳定.实验完成后熔融盐中Na2CO3分布呈现中部高两头低的分布规律,Na2CO3和NaOH比例变化时熔融盐熔点变化较小.这些特性都表明熔融盐粗燃气成份调质适合作为气化、热解制备合成气的后续工艺,提升燃气品质. 相似文献
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基于电化学理论、膜分离与传质理论,采用非平衡态热力学,建立了熔融盐(43.5% Li2CO2 25%K2CO3 31.5?Na2CO3)(mol.?膜法脱除C02数学模型。首先,根据熔盐体系离子的Hittorf迁移数、比电导、扩散系数等独立实验参数,计算得到体系的Onsager系数和模型参数,然后用计算机求得该模型的数值解。解的结果表明:影响CO2传质通量的因素主要有电流密度及C02在膜两侧的浓度差。在低电流密度下,浓差推动力起主导作用:在较高电流密度下,膜两侧浓差推动力对C02传质影响甚微,电流密度对C02的传质则起着决定性作用。为了进一步验证数学模型,在823K及常压条件下,模拟航天舱中的气体成分,进行了熔融盐膜法脱除CO2的实验研究。实验结果与模型理论解吻合较好。 相似文献
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熔融盐电镀铝的研究进展 总被引:10,自引:0,他引:10
综述了无机熔融盐电镀铝的各种熔盐组成及相关参数。探讨了无机熔融盐电镀铝的反应机理和铝枝晶的抑制,并介绍了无机熔融盐体系电镀铝的应用和发展前景。 相似文献
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Jairton Dupont Paulo A.Z. Suarez Alexandre P. Umpierre Roberto F. de Souza 《Catalysis Letters》2001,73(2-4):211-213
The combination of 1-n-butyl-3-methylimidazolium chloride with ZnCl2 affords ionic mixtures with different melting point temperatures depending on the zinc molar fraction. RuCl2(PPh3)3 immobilised in the low melting mixture (60°C) promotes the 1-hexene hydrogenation (turnover frequencies up to 44 min–1) and the recovered solid catalyst phase can be reused several times. 相似文献
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有机熔盐电镀铝的研究进展 总被引:1,自引:0,他引:1
在有机熔盐电镀铝体系的构成、物理和电化学性质的基础上,对卤化烷基吡啶类、卤化烷基咪唑啉类、氯化烷芳基铵盐类电镀铝及铝合金的研究现状进行了阐述,并对这3种有机熔盐电镀铝体系的优缺点进行了归纳总结。最后,指出了有机熔盐电镀铝体系的应用前景和发展方向。 相似文献
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以生物质炭为原料在上吸式固定床气化炉中进行水蒸气气化制备富氢合成气,考察了不同原料、粒径和催化剂对生物质炭水蒸气气化影响。结果表明,不同类型炭气化结果存在较大差异,其中木片炭气化结果最优,其次是玉米芯炭和稻壳炭,秸秆炭气化结果最差,木片炭产氢率最大为222.8g/kg。粒径的改变主要影响炭转化率,炭转化率随着粒径的增加呈增加趋势。通过炭吸收方式负载催化剂为有效的方法,其中在相同钾盐质量分数下,KOH催化能力较优于K2CO3,且气化速率为未加催化剂条件下的两倍。炭转化率随着碱液浓度的增加而增加,但浓度过高会增加灰分含量从而不利于产氢率,玉米芯炭催化气化最高产氢率为197.8g/kg,在碱质量分数为6%下获得。 相似文献
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Cathodic refining in molten salts: Removal of oxygen, sulfur and selenium from static and flowing molten copper 总被引:2,自引:0,他引:2
The removal of nonmetallic impurities, including oxygen, sulfur and selenium, from molten copper (cathode) was achieved by constant voltage electrolysis in molten BaCl2 and CaCl2 alone, or the eutectic mixture of the two at temperatures slightly higher than the melting point of copper. At the applied voltages (2.1 2.9 V), the cathodic refining occurred without provoking the decomposition of the chloride salts, demonstrating the cathodic ionization of impurities to be responsible. Further evidence supporting this mechanism came from SEM, EDX and preliminary voltammetric studies. To increase the mass transfer of the impurities in the molten copper during the refining process, a novel recessed channel electrode (RCE) was used. The results have demonstrated the feasibility and efficiency of using this technology in terms of space, time and yield of product, offering considerable advantages over a simple electrorefining cell. 相似文献
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The solubility and the polymerization of polyacrylonitrile in low‐temperature molten salts was investigated. It was found, that the polymer dissolves in eutectic mixtures of molten sodium thiocyanate and potassium thiocyanate (NaSCN/KSCN) as well as in the molten hydrate lithium perchlorate (LiClO4*3H2O). The polymer can be regenerated by cooling the melt or diluting with water. The chemical interaction between the molten salt and the polymer was investigated by 13C‐NMR spectroscopy. These measurements show that the dissolution of the polymer in molten KSCN/NaSCN is accompanied by the splitting of the the hydrogen bonds. Starting from acrylonitrile, the formation of polyacrylonitrile by a radical polymerization in a molten salt becomes successful. The polymerization of acrylonitrile in an eutectic mixture of KSCN/NaSCN results in the formation of atactic polyacrylonitrile with high molecular weight. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2113–2117, 2000 相似文献
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Tianyu Yao Haiyan Yang Kui Wang Haiyan Jiang Xiao-Bo Chen Hezhou Liu Qudong Wang Wenjiang Ding 《Frontiers of Chemical Science and Engineering》2021,15(1):138-147
Effects of NaI as an additive on electrodeposition of Al coatings in AlCl3-NaCl-KCl(80-10-10 wt-%)molten salts electrolyte at 150°C were investigated by means of cyclic voltammetry,chronopotentiometry,scanning electron microscopy and X-ray diffraction(XRD).Results reveal that addition of NaI in the electrolyte intensifies cathodic polarization,inhibits growth of Al deposits and increases number density of charged particles.The electrodeposition of Al coatings in the AlCl3-NaCl-KCl molten salts electrolyte proceeds via three-dimensional instantaneous nucleation which however exhibits irrelevance with NaI.Galvanostatic deposition results indicate that NaI could facilitate the formation of uniform Al deposits.A compact coating consisting of Al deposits with an average particle size of 3μm was obtained at a current density of 50 mA?cm?2 in AlCl3-NaCl-KCl molten salts electrolyte with 10 wt-%NaI.XRD analysis confirmed that NaI could contribute to the formation of Al coating with a preferred crystallographic orientation along(220)plane. 相似文献
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