3500 t/a双氧水装置填料塔氧化改空塔氧化

介绍了3500 t/a双氧水装置氧化工序的生产工艺,改造前和改造后氧化塔的结构特点、改造过程、技术参数、改造后的运行情况.     

老城区异型道路交叉口的改造方案——以安徽省含山县华阳路为例

交叉口改造需结合路网规划、周边用地、交通流量及现场改造条件等多方面进行研究分析,重点把握改造方案的合理性和可行性。根据徽省含山县某五叉环形交口存在的问题提出三个改造方案。分析认为：这三个方案在技术上都把握住了四个要点：改造目的、改造线路、改造后的主要交通通道和合理利用改造后的空地。     

100”硫化机电气控制系统的改造

应用三菱Q系列的PLC对原来的西门子S5系列PLC控制系统进行改造。介绍改造的理由,改造后控制系统的软、硬件构成和系统运行后各性能情况。改造后效果良好。     

金桥热电厂300MW机组循环水泵双速改造节能分析

金桥热电厂为降低厂用电率,减少发电成本,创建环境友好型、资源节约型电厂对循环泵电机进行变极变速改造。本文介绍了循环泵电机变极变速改造原因、改造节能原理、改造方案以及改造后的运行方式,并对改造前后的运行参数进行对比分析,给出对循环泵电机变极变速改造后的节能效益。     

80kt/a合成氨装置变换系统优化改造运行总结

介绍了与80 kt/a合成氨装置配套的0.8 MPa中低低变换工艺优化改造为全低变工艺前、后流程情况及改造内容。通过对改造前、后运行情况的比较与分析,论证了优化改造后的变换系统具有良好的节能效果,控制更加简便、灵活。     

粘胶长丝后处理淋洗工序水洗工艺节能改造措施

介绍了粘胶长丝后处理淋洗工序水洗工艺节能改造措施,吨丝消耗软水由改造前的102t降到改造后的86t、消耗蒸汽由改造前的25t降到改造后的21t,措施节能效果明显。     

氨合成塔内件改造总结

介绍合成氨装置卡萨利氨合成塔主要内件的构成、塔内气体流程、催化剂框由丝网结构改造为槽板结构等改造要点、内件改造前、后催化剂运行工艺对比情况.改造后节能降耗效果明显,达到了预期的目的 .     

液氯改造的回顾

较全面地介绍了我厂液氯改造之目的、改造过程、设备安装情况，以及改造后取得的实际效果。结论为：液氯改造后，改善了厂区环境，实现了工艺设备更新换代，生产能力提高明显，节能增效显著，设备运转可靠，达到改造的预期目的。     

变换装置醇联氨改造运行小结

简要介绍变换装置改造前、后运行情况的对比和改造后的经济效益。     

钢丝帘布压延锭子架改造

介绍钢丝帘布压延锭子架由B40锭子形式改造为B80锭子形式生产的改造方案、工艺参数确定、改造实施、工艺调试、改造和使用中需要注意的问题及改造后经济效益.钢丝帘布压延锭子架改造后,设备运行良好、钢丝帘布质量稳定;按年产子午线轮胎100万套计算,每年可节约资金60多万元,经济效益可观.     

氢气纯度分析方法准确性的探讨

ONACCURACYOFANALYSISOFOFHYDROGEN1前言我公司目前应用的氢气纯度分析方法有两种,一种是爆炸反应法,另一种是焦性没食子酸吸收法。几年来,人们对两种分析方法的准确性曾有过褒贬不一的评论。这里我们也谈谈自己粗浅的观点。2爆炸法测定氢气纯度一定量的氢气样品与适量的空气之均匀混合物因反应后生成液体水而引起气体体积减少,减少的体积等于参加反应气体体积之和。其中l／3为氧气,2／3为氢气。根据氢气取样量和反应前后混气体体积之差,以及氢气在反应中的体积比例关系,可计算出样品的氢气纯度。计算公式式中：A一混…     

COMPARISON OF METHODS OF ANALYSIS OF GYPSUM1

The different analytical methods proposed for the evaluation of gypsum have been subjected to an experimental test. A combination method, consisting of a fusion with KHCO₃ and determination of CaO by KMnO₄ titration, the SO₃ by Andrews method of titration of BaCrO₄ has been found to give very reliable results with the least consumption of time.     

SEDIMENTATION OF BINARY MIXTURES OF PARTICLES OF UNEQUAL DENSITIES AND OF DIFFERENT SIZES

A model is developed for the sedimentation from a suspension of two particle species of unequal densities and of different sizes. The composition and the thickness of various layers in the sediments are predicted using graphical and analytical methods. The model predictions were in excellent agreement with experimental results, when the particle size ratio was ≥ 108. When size ratio of the particles was 2.60 and 4.31 the agreement occurred in about 50 percent of the cases.     

HEASUREHENT OF INSTANTANEOUS RATES OF LOSS OF VOIATILE COMPOUNDS DURING DRYING OF DROPS

A novel technique serves to monitor instantaneous rates of loss of a volatile solute from a suspended drop during drying. A highly sensitive electron capture detector is used to monitor concentrations of SF6 released into a flowing gas stream from a suspended, drying drop. Simultaneously, the appearance and morphological development of the drop are monitored with a video camera. This provides the wherewithal of relating instantaneous rates of loss of the volatile solute to particular events during the development of particle morphology.

Initial experiments have been carried out with drops of aqueous solutions of glucose, sucrose, maltodextrin and coffee extract. The results clearly display the onset of the volatiles-retentive selective diffusion phenomenon. There is also substantial loss of the volatile component later in the drying process, when the drops undergo repeated ex ansion, bursting and cratering due to the formation of internaf bubbles. These experiments appear to be the first quantitative demonstration of major losses accompanying changes in drop morphology.     

茶多酚提取方法进展

本文综述了国内外现有茶多酚提取方法的现状以及近期的研究进展，并对其优缺点进行了评价。这将有助于中低档茶的综合利用和茶多酚的进一步开发应用。     

几种针状焦性能对比

针状焦分石油系和煤系两大类,这主要取决于针状焦的原料来源。在同一系列中由于原料不同和工艺条件不同 ,针状焦的各自性能也不相同。针状焦是生产超高功率石墨电极和高功率石墨电极的主要原料 ,针状焦的性能对石墨电极的质量有至关重要的影响。所以对针状焦性能以及其对石墨电极质量影响的研究十分必要的。以下是常用的几种进口针状焦和国产针状焦的性能对比。１原料性能分析对比原料试样包括４种针状焦 ,其中两种为进口针状焦：三菱针状焦和新日化针状焦;另两种为国产针状焦：鞍山针状焦和锦州针状焦。其中除锦州针状焦是石油系针状焦外…     

ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

Viscosity of Simple Soda-Silicate 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log₁₀ viscosity amounting to 0.6, those of Washburn et al., being relatively too high. If correction for this is made, the isothermal curves of log₁₀ viscosity as a function of soda content are smooth up to 50% Na₂O, showing no inflection. The observations as a function of temperature T are all represented within accidental error by an equation of the type where all three constants vary regularly with the composition. Change of Viscosity of Glass (6SiO₂, 2Na₂O) due to Molecular Substitution of CaO, MgO and Al₂O₃ for Na₂O The effect is clearly brought out by plotting (from the results of English) the change of log₁₀η due to the substitution as a function of temperature. The curves each show a sharp bend at a temperature between 840° and 1050°C, which is designated the aggregation temperature T_a. If we divide these curves by the corresponding percentage substituted, we get curves for each oxide which are straight and parallel below the aggregation temperatures, the slopes (increase of change of log₁₀η per 100°C) being −0.056 (CaO), −0.055 (MgO), −0.018 (A1₂O₃) per per cent oxide substituted. For substitution of 1/2 molecule the slopes are −0.325 (CaO), −0.23 (MgO) and −0.18 (Al₂O₃) per 100°. At the aggregation temperature the change of log₁₀η per per cent is a minimum, 0.03 to 0.06 for CaO, 0.12 for MgO, 0.07 for Al₂O₃. Evidence of Aggregation in Glasses, from viscosity Measurements The sharp bends in the plots of change of log₁₀η due to substitution of an oxide for Na₂O, suggest the beginning of molecular aggregation at these temperatures. These aggregation temperatures are close to the devitrification temperatures, but the effect on the viscosity curves cannot be due to actual devitrification since it does not change with time. Taking the aggregation temperatures as equal to devitrification temperatures, additional isotherms are roughly sketched into the equilibrium triangle of the system Na₂O-CaO-SiO₂. Change of Viscosity of Glass (4SiO₂, 2Na₂O) due to of Substitution of B₂O₃ for SiO₂ The change of log₁₀η (from the results of English) is plotted as a function of temperature, and also the change of log₁₀η per per cent B₂O₃. The curves are more complex than for the substitution for Na₂O.     

环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

骑式摩托车油箱喷涂工艺的改进

面对日益激烈的市场竞争,摩托车油箱外观质量越来越成为影响销售的因素之一。文章介绍了改进工艺后的油箱涂装,该涂装体系提高了油箱外观的丰满度,降低了油箱涂装的生产成本。     

聚酰亚胺的合成法

本文评述了缩聚型聚酰亚胺的主要合成方法和近年来国际上在合成中所做的探索。