新型酚醛复合材料风管在通风空调系统中的应用

本文简要介绍了一种新型酚醛复合风管的特点及其用于通风空调系统的优良特性;同时从施工工艺角度,将这种酚醛复合风管与传统材质风管在耐火性能、保温性能、强度特性、加工与安装工艺及综合经济性能等方面进行了全面的比较分析,证明了酚醛复合风管的相对优越性;并介绍了推广酚醛复合风管应用巨大的前景与经济意义。     

单面铝板酚醛铝箔复合风管在工程上的研究及应用

近十年我国开发酚醛泡沫塑料成功的运用于管道及罐体保温、外墙保温、中央空调风管、防火隔带、船舶建造业、石油化工业,尤其是由酚醛泡沫做芯材制作而成的酚醛复合风管,作为中央空调的采暖制冷的通风管道近些年被大力推广,酚醛复合风管以其施工工期短、造价低、安装便捷、环保性能高、高绝热性等优势受到建筑业的青睐,医专图书馆单体通风采暖选用了单面铝板酚醛铝箔复合风管,施工完成后即满足了图书馆中央空调安装体量大、工期紧的进度要求,又克服了双面酚醛铝箔复合风管易脆性的质量需求,针对医专图书馆单面铝板酚醛铝箔复合风管运用施工实例,对单面铝板酚醛铝箔复合风管各种特性优势展开研究,以便单面铝板酚醛铝箔复合风管大范围推广应用。     

中央空调系统新型复合材料风管主要安装施工技术及分析

复合材料酚醛铝箔复合风管作为一种新型风管广泛应用于中央空调系统中,但存在结构可靠性差、特殊连接节点构造处理技术难度大的技术难题。本文基于酚醛铝箔复合风管的安装工艺流程,对风管连接及吊装等关键质量控制点的技术要求及操作要点进行详细的分析和阐述,对于提高酚醛铝箔复合风管的安装质量及工程应用的推广有所助益。     

复合风管制作质量控制要点

本文结合国家标准GB50738-2011《通风与空调工程施工规范》,对我国目前常用复合风管(聚氨酯铝箔复合风管、酚醛铝箔复合风管、玻纤复合风管、玻镁复合风管)的制作质量控制要点进行分析论述,指出质量控制关键工序及措施。     

基于全寿命周期费用分析法的风管系统的选择

针对目前国内还没有一种有效的方法用于选择和评价风管系统的现状,提出采用全寿命周期费用分析法来选择和评价风管系统,并在实际工程中,采用该方法比较和分析国内4种常见风管系统的一次性投资、能耗费和维护费,重点对各风管的全寿命周期费用进行评估,认为酚醛铝箔复合风管的费用最低,是一种值得推广的风管系统。     

浅析单面彩钢酚醛复合风管施工工艺

单面彩钢酚醛复合风管具有防水、无味、无毒、不腐、不裂、不变形、不燃、高强质轻、施工方便、使用寿命长等特点。笔者结合工程实践,详细介绍该复合风管的制作安装施工工艺。     

浅析单面彩钢酚醛复合风管施工工艺

单面彩钢酚醛复合风管具有防水、无味、无毒、不腐、不裂、不变形、不燃、高强质轻、施工方便、使用寿命长等特点。笔者结合工程实践,详细介绍该复合风管的制作安装施工工艺。     

复合玻纤风管在西北地区应用的探讨

介绍了复合玻璃纤维风管的组成及性能特点。通过分析施工安装的技术要点，说明该产品的性能优势和局限性。并从技术经济角度进行了一定分析比较，为该种新型风管材料在西北地区的推广应用起到了一定的指导作用。     

玻璃纤维板复合风管的特性及其在施工过程中的注意事项

通过对玻璃纤维板复合风管与传统风管的比较，阐述了玻璃纤维板复合风管在实际施工过程中的注意事项。     

双面铝箔复合保温风管在空调工程中的应用

描述天津某空调工程的风管系统采用双面铝箔复合保温风管代替传统的镀锌钢板风管的设计与施工过程。详细讲解复合风管的优越性能、制作工艺及风管的安装,并以工程实例分析替代方案的经济可行性。     

Comparative test on two kinds of new compliant foil bearing for small cryogenic turbo-expander

Two kinds of new compliant foil journal bearing for a small cryogenic turbo-expander used in the Brayton cycle cryocooler are presented in this paper. The foil of bearings is supported with copper wires and elastic material respectively, so the bearings are much simpler in structure than previous compliant foil bearing. The performances of the bearings are studied under the same experiment conditions. The results indicate that both bearings have better damp performance and the foil bearing supported with elastic material has preferable stability to the one supported with copper wires.     

复合机铝箔换卷中的速度损失研究

目的减少铝箔复合机换卷时的速度降幅及变化,改善降速换卷中容易断幅的问题,从而提高设备的综合效率(OEE)。方法通过对实验数据的5W1H和张力分析,建立复合机铝箔换卷时铝箔张力的动力模型,探讨了张紧辊张力、压辊压力、铝箔偏心度、运动离心力方向角和速度差等影响铝箔张力的因素,并对实际操进行了实验改进。结果铝箔在换卷时速度变化得到改善,改善了断幅的问题。结论调整影响铝箔张力等一系列因素,综合效率(OEE)达到92.1%,提高了生产效率。     

电容器用铝箔阳极氧化膜的改性研究

阳极氧化膜是电解电容器的工作介质,其质量的优劣直接影响着铝电解电容器的性能。形成前将腐蚀箔在约７５℃左右的Ａ溶液（约０．２ｍｏｌ／Ｌ）中浸泡约１０ｍｉｎ,然后在５７０℃左右热处理３ｈ,阳极氧化膜的结构与性能会得到极大改善,铝箔比容可提高２５－５０％,形成电量降低３０－５０％,从而可有效提高形成效率。     

超声电沉积锡基碳纳米管复合材料制备工艺研究

采用了超声电沉积工艺制备了锡基碳纳米管复合材料,作为锂离子电池负极,研究其电化学性能.采用了正交实验研究了电沉积操作条件对材料电化学性能的影响,并依据实验结果给出了初步的解释,同时总结出最佳电沉积操作条件,在此基础上,制备出了性能最优的锂离子电池锡基碳纳米管复合材料负极.     

新型酚醛SMC增稠剂及增稠机理的研究

本文通过粘度实验,研究了酚醛片状模塑料(P-SMC)的新型增稠剂.结果发现,B₂O₃和ZnO混合体系是较好的酚醛树脂增稠剂;当在100份树脂中加入4份B₂O₃和1份ZnO时,可达到理想的增稠效果.文中还通过红外光谱探讨了B₂O₃和ZnO对酚醛片状模塑料的增稠机理,分析表明B₂O₃对树脂有较好的增稠作用,ZnO可延缓B₂O₃对树脂的增稠,使增稠时间调节到较为理想的程度.     

碳前驱体对LiFePO_4/C复合材料的形貌及电化学性能的影响

采用葡萄糖、环氧树脂、酚醛树脂为碳源制备了LiFePO4/C复合材料。利用X射线衍射、扫描电镜等方法对复合材料进行研究。结果表明,葡萄糖获得了碳包覆复合材料,而环氧树脂、酚醛树脂则得到了碳芯结构复合材料。碳芯结构复合材料的电化学性能优于碳包覆复合材料,电流密度为15mA/g时,试样C、D的放电容量分别为165、167mAh/g;电流密度为600mA/g时,试样C、D的放电容量分别为139.4、145.5mAh/g,经过50循环后容量保持率分别高达99.2%、99.5%。     

Numerical and experimental studies on stability of cryogenic turbo-expander with protuberant foil gas bearings

High speed turbo-expander is an essential refrigerating component in cryogenic systems. In addition to thermodynamic performance, its stability in transient high speed operation is also of great concern for its comprehensive performance. Oil free foil bearing has a great application potential in high speed turbomachinery by virtue of its high stability with no extra external supplying gas. In this paper, finite element model of a 150 Nm³/h cryogenic turbo-expander using foil bearing for air separation is configured for a case study. Influence of bearing structural stiffness and damping characteristics on the rotor-foil bearing system are evaluated for stable operation. Static structural stiffness and damping coefficients of the protuberant foil journal bearing and thrust bearings are obtained from the static loading and deflection tests. With the tested coefficients, rotordynamic performances of the rotor-bearing system is analyzed numerically and compared with the transient experimental results.     

Potential application of hemoglobin as an alternative to peroxidase in a phenol biosensor

This work describes a new amperometric biosensor for detecting phenolic compounds. The sensor was designed by immobilizing Hemoglobin (Hb) in a sol-gel matrix onto a carbon electrode. Using the peroxidase activity of Hb, the phenolic compound can be reduced in the presence of H₂O₂. The biosensor's performance in phenolic compound detection was based on mediated electron transfer by Hb. The direct electron transfer of Hb can be avoided by use of the sol-gel matrix. The proposed biosensor presents a very sensitive response for phenolic compounds at an applied potential of 0.0 mV vs. Ag/AgCl. The parameters of the fabrication process for the electrode were optimized. Experimental conditions influencing the biosensor performance, such as pH and potential, were investigated and assessed. Various types of phenolic compounds were detected. Among them, using the optimized conditions, a linearity for the detection of the phenol was observed from 5 μM to 50 μM. Biosensor response levels after 30 days were at more than 80% of their initial response readings level. The response time of the biosensor was about 10 s.     

Inhibition of biogas production and biodegradability by substituted phenolic compounds in anaerobic sludge

Phenolic compounds are abundant in nature and organic wastes. This biomass may be utilised in biogas generation. Phenolics can inhibit the degradation of readily biodegradable organic fractions and their own biodegradation. In this work, assays were carried out under anaerobic conditions to study the inhibition of both gas production and biodegradability due to seven phenolic compounds and to study their adsorption onto sludge and autoxidation in the aqueous medium. Fifty percent inhibition was in the range of 120 to 594 mg of compound/g VSS. An initial enhancement followed by an inhibition of biogas formation was found. The inhibition by the phenolic compounds was found to be influenced by autoxidation, apolarity, type, size and number of substitutions. Biogas production is influenced by concentration rather than any pH change. The concentration of the phenolic compound was partially biomethanized and the degradation of gallic and caffeic acids by this process is reported here for the first time. The maximum total biodegradation of any phenolic compound was 63.85+/-2.73%, and remaining non-biodegradable fraction was autoxidized and adsorbed onto the sludge matrix. Inhibition of methanization and partial inhibition of background gas was found at concentrations between 800 and 1600 mg/L organic carbon.