共查询到19条相似文献,搜索用时 62 毫秒
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一、技术现状
近几年来,催化燃烧技术在国内外得到科学界的普遍关注和重点研究,催化燃烧技术的发展已经进入了实用阶段。在欧洲催化燃烧技术广泛应用于工业加热及燃气取暖领域,在日本催化燃烧技术也广泛应用于废气净化及民用燃具等行业。而在我国’催化燃烧技术目前只在废气净化领域的应用取得了一定成效.众所周知,我国县一个能源消耗大国, 相似文献
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氯化铵法氯化混合氧化稀土及其动力学的研究 总被引:3,自引:0,他引:3
研究了氯化铵氯化混合氧化稀土的适宜条件及氯化反应动力学。结果表明 :氯化铵氯化混合氧化稀土的适宜条件为氯化剂用量为物质的量比n氯化铵∶n氧化稀土 =1 2∶1 ,氯化焙烧温度 380~ 42 0℃ ,氯化时间 30min ,稀土的氯化率在 99%以上 ;混合氧化稀土氯化反应的表观活化能Ea 为 75 .82kJ·mol- 1 ,过程限制环节是界面化学反应控制。CeO2 与NH4 Cl的反应和反应程度分别是混合氧化稀土氯化的控速步骤和决定混合氧化稀土氯化率的关键。混合氧化稀土的组成和配分是影响氯化铵氯化氧化稀土氯化率和氯化反应速率的重要因素。 相似文献
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滚筒炉排燃煤机是一种炉窑燃煤用的新型燃烧设备,属于专利产品。它是由多个空心滚筒、电动机带动的传动机构及滚筒支承装置等所组成。滚筒炉排燃煤机的主体是平行排列的多个空心滚筒。滚筒同步转动,就带动滚筒面上的煤层向前移动;滚筒面上还排列有许多小孔,由相连风管送来的空气,就从小孔吹出,满足煤层燃烧需要。滚筒炉排燃煤机的特点有:结构简单、紧凑,耗钢量少,制造成本低;适用煤种广,煤渣含炭量低,燃烧完全;炉排不漏风,不漏煤,配风自由调节,节能效果显著,环保效益好;炉排运行条件好,使用寿命长。 相似文献
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Four chars prepared from pulverized coals were subjected to non-isothermal and isothermal combustion tests in a thermogravimetric analysis(TGA)device.Three different test methods,i.e.,non-isothermal single heating rate(A),non-isothermal multiple heating rate(B),and isothermal test(C),were conducted to calculate the kinetic parameters of combustion of coal char.The results show that the combustion characteristics of bituminous coal char is better than that of anthracite char,and both increase of heating rate and increase of combustion temperature can obviously improve combustion characteristics of coal char.Activation energies of coal char combustion calculated by different methods are different,with activation energies calculated by methods A,B and C in the range of 103.12-153.77,93.87-119.26,and 46.48-76.68kJ/mol,respectively.By using different methods,activation energy of anthracite char is always higher than that of bituminous coal char.In non-isothermal tests,with increase of combustion temperature,the combustion process changed from kinetic control to diffusion control.For isothermal combustion,the combustion process was kinetically controlled at temperature lower than 580℃ for bituminous coal char and at temperature lower than 630℃ for anthracite char. 相似文献
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介绍了稀土作为添加剂在铸铁、钢、有色金属合金和电镀中的应用,归纳了稀土在各领域的作用机理。 相似文献
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不锈钢着色中的稀土添加剂 总被引:1,自引:0,他引:1
在不锈钢化学着色中 ,我们开发了稀土添加剂。使用这种添加剂的优点是 :色彩更加艳丽 ,成膜坚牢 ,着色速度提高一倍以上 ,且加工温度可以提高 70℃ ,讨论了可能的机理。 相似文献
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几种稀土氨基酸络合物合成及离解动力学研究 总被引:4,自引:2,他引:2
本文合成了稀土(RE=La,Pr)与甘氨酸(Gly),谷氨酸(Glu)四种络合物及镨与赖氨酸(Lys)的络合物。在模拟生理条件下,测定了络合物的离解动力学方程。实验表明,在pH=4时,络合物的离解呈现一级动力学规律,并且镨赖氨酸络合物离解迅速且离解程度较大,谷氨酸络合物离解速度亦较快,甘氨酸络合物则不发生离解。作为络合物中心离子的La和Pr对络合物的离解速度影响较小。稀土甘氨酸络合物较稳定,用于饲料添加剂是有利的 相似文献
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Jiu-gang SHAO Jian-liang ZHANG Guang-wei WANG Zhe WANG Hong-wei GUO 《钢铁研究学报(英文版)》2014,21(11):1002-1008
Non-isothermal combustion kinetics of two kinds of low volatile pulverized coals (HL coal and RU coal) were investigated by thermogravimetrie analysis. The results show that the combustibility of HL coal was better than that of RU coal, and with increasing heating rate, ignition and burnout characteristics of pulverized coal were improved. The volume model (VM), the random pore model (RPM), and the new model (NEWM) in which the whole combustion process is considered to be the overlapping process of volatile combustion and coal char combustion, were used to fit with the experimental data. The comparison of these three fitted results indicated that the combustion process of coal could be simulated by the NEWM with highest precision. When calculated by the NEWM, the activation energies of volatile combustion and coal char combustion are 130.5 and 95.7 kJ · mol^-1 for HL coal, respectively, while they are 114.5 and 147.6 kJ ·mol^-1 for RU coal, respectively. 相似文献