中压锅炉给水泵透平J542振动大原因分析与处理

中压锅炉给水泵透平调速系统定位器故障,引起透平转速波动大,从而导致透平轴承振动大。通过分析中压锅炉给水泵透平转速波动大的原因,提出处理措施,从而彻底解决透平轴承振动大的问题。     

科技动态

ＷＤＸ锅炉给水泵　　据美国ＩｎｇｅｒｓｏｌｌＤｒｅｓｓｅｒ泵业公司为本刊提供的信息,美国ＩｎｇｅｒｓｏｌｌＤｒｅｓｓｅｒ公司研制的ＷＤＸ系列卧式多级环形截面泵可作为用于发电、焚烧和普通工业中的中压锅炉给水泵和冷凝回水泵。这种新型的系列泵改进了泵的效率?..     

合成氨装置机泵升级改造及应用

介绍合成氨装置中压锅炉给水泵和氨洗涤塔进料泵的运行情况,针对运行稳定性差、故障率高、检修难度高、维护成本高等问题进行升级改造,改造后泵的运行效率提高、故障率降低,保证了装置安全稳定运行。     

高压锅炉给水泵平衡腔压力高原因分析及修复处理

高压锅炉给水泵平衡套O形密封圈失效是造成高压锅炉给水泵泵平衡腔压力升高的主要原因,介绍高压锅炉给水泵泵盖缺陷处理措施,较好地解决了高压锅炉给水泵平衡腔压力升高的问题,为一化二化同类型高压锅炉给水泵泵盖密封的泄漏处理及相关问题提供了很好的解决措施。     

高压锅炉给水泵平衡腔压力高原因分析及修复处理

高压锅炉给水泵平衡套O形密封圈失效是造成高压锅炉给水泵泵平衡腔压力升高的主要原因,介绍高压锅炉给水泵泵盖缺陷处理措施,较好地解决了高压锅炉给水泵平衡腔压力升高的问题,为一化二化同类型高压锅炉给水泵泵盖密封的泄漏处理及相关问题提供了很好的解决措施。     

浅谈化工锅炉给水泵的运行维护以及故障排除

化工锅炉给水泵为锅炉的可靠运营提供保障,由于锅炉给水系统自动化程度的不断深入,锅炉水位的自动控制使得锅炉的运行可靠性得以提升。然而近几年,因锅炉给水泵发生故障,使得锅炉停止运行的现象时有发生,其原因就在于锅炉运维技术人员并未能准确分析锅炉给水泵的故障之所在。本文对锅炉给水泵的运行维护以及怎样排除故障问题进行了深入的探究,为锅炉运维技术人员提供有力的帮助。     

20t/h余热锅炉给水泵的节能改造

1问题的提出我公司现有两条准3.6m×70m带余热发电的中空窑水泥生产线,窑尾装有20t/h余热锅炉两台,配有3台4G C-8×8型电动锅炉给水泵。锅炉给水泵运行出口压力3.4M Pa,而给水泵最高扬程只有344m。为满足锅炉运行要求,必须有两台给水泵运行。给水泵运行效率只有38%,电能消耗大,浪费能源。2改造设计方案2.1锅炉给水泵流量及扬程的确定原则给水泵流量及扬程应按G B50049-94《小型火力发电厂设计规范》确定。每台给水泵流量应为对应的锅炉额定蒸发量的110%。其扬程应为给水系统总阻力的120%。2.2给水泵流量及扬程的计算给水泵质量流量为:G=1…     

F101-5/39-450型余热锅炉的使用情况

我厂硫酸车间2系统沸腾炉中压余热锅炉,于1984年7月13日一次开车成功,投入生产运行。余热锅炉系杭州锅炉厂产品,是与年产4万吨硫酸沸腾炉配套的F101—5/39—450型。热水循环泵为80R—60A型,给水泵为50DG50×11型,均由杭州锅炉厂配套供应。     

锅炉装置高压多级离心泵问题分析与处理措施

针对黔希化工锅炉装置所使用德国XX型高压锅炉给水泵在启泵过程中,锅炉给水泵叶轮口环多次出现摩擦、卡涩抱轴现象问题,影响锅炉供水系统,制约锅炉装置,为汽轮机提供9.8 MPa、540℃的饱和蒸汽,为消除锅炉给水泵对锅炉装置供水系统的影响,对高压锅炉给水泵出现摩擦、卡涩抱轴现象进行分析与处理,并对出现的问题提出了有效的解决方案,检修完成后开车运行稳定.     

锅炉给水泵的改造

针对锅炉给水泵出口压力不足的问题,提出对锅炉给水泵叶片尺寸的改进措施,达到了预期效果。     

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.     

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…     

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。     

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.     

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.     

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。     

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…     

用两个形状指数表征粉煤灰颗粒形貌的研究

引用两个形状指数表征颗粒形状的概念,即先将颗粒形状近似为椭圆,再将椭圆图像分离:以圆为基准的颗粒宏观形状指数δ;以光滑椭圆为基准的颗粒轮廓凹凸度,即微观形状指数ζ。分析和发展了近似椭圆模型。并运用图像分析仪对粉煤灰、水泥样品进行实验。结果表明,粉煤灰颗粒的两个形状指数δ和ζ都大于水泥颗粒。证明粉煤灰颗粒的球形度、表面光滑度优于水泥,而且,随着粒径增大,δ和ζ呈下降趋势,表明磨制颗粒越粗。(?)粒形状越不规则。文中还运用近似椭圆模型再现了颗粒的模拟图像。