空气压缩机气体出口温度异常原因分析及处理措施

空气压缩机在工业上应用极为广泛,被称为"通用机械",是化工生产企业的重要设备.在实际生产中,空气压缩机气体出口温度超温对空气压缩机出口压力和气量影响比较大,出口严重超温时,能造成机组零部件损坏,影响空气压缩机安全稳定运行.对空气压缩机气体出口温度超温进行原因分析和讨论,确保空气压缩机安全稳定运行.     

离心式空气压缩机常见故障分析

本文通过考察分析离心式空气压缩机常见故障——轴承温度过高、轴承振动过大、气体冷却器出口处超温、气体出口流量降低、油压突然下降的产生原因和排除方法,提出使用离心式空气压缩机的注意事项。     

空气压缩机级间换热器出口温度高的危害及处理措施

对天津石化PTA装置空气压缩机级间换热器因循环水结垢导致空气出口温度高,进行危害识别、原因分析。指出在线酸洗是目前解决换热器循环水结垢最经济的措施。     

工艺空气压缩机富裕气作空分气源的可行性研究及实施

针对当前生产负荷下工艺空气压缩机出口工艺空气有一定量的富裕（放空）,考虑正常生产时空分停用５Ｌ空气压缩机,利用工艺空气压缩机富裕气作为空分５Ｌ空气压缩机后续装置的气源,达到节能目的。     

夏季提高硝酸产能的一次成功尝试

在硝酸生产中,普遍存在夏季空气压缩机打气量低的问题。我公司的硝酸装置冬季满负荷生产时,进口阀开度只有50％左右,空气压缩机出口压力即可达到1203kPa;而在夏季,空气压缩机进口阀开度在100％时,出口压力却只有1100kPa,比满负荷时低100kPa,严重影响了硝酸声量。据调查,整个硝酸行业夏季硝酸产量比冬季低4％左右,主要原因就是夏季空气压缩机的打气量比冬季低太多的缘故。     

微生物粘泥腐蚀油冷却器的解决措施

哈尔滨气化厂空分分厂制氧车间的空压机油冷却器担负着为空气压缩机润滑油的冷却工作,一旦润滑油温升超标或油中带水,空压机就必须停机。该冷却器共2台,1开1备,润滑油走管程,循环水走壳程。运行参数：润滑油入口设计温度为52℃,出口温度为40℃,最高不允许超过45℃,设计压力为0．2MPa;循环水入口设计温度为28℃,出口温度38℃,压力为0．5MPa(循环水系统为敝开式)。自1993年投入运行以来,润滑油出口多次出现温升超标现象,     

一起氮气窒息事故的原因分析及处理措施

介绍了一起氮气窒息事故的经过,通过事故的处理,得出离心式空气压缩机没有与生产系统可靠隔绝、缺乏必要的通风措施是事故发生的主要原因;当班人员责任意识不强、检查不到位是事故发生的次要原因;空气压缩机与氮气压缩机使用同一放空出口是事故发生的根本原因。针对事故发生的原因,提出了相应的整改措施,即在离心式空气压缩机大修期间,将手动和自动放空阀全部关闭;对压缩机冷却器及与其相连的管道进行除锈、防腐期间采取强制通风措施;对氮气压缩机实施技术改造以及加强职工安全培训。     

空气压缩机存在问题及改进措施

通过分析空气压缩机参数波动的现象,发现主要原因是喘振线设计不合理以及二段出口换热器换热效果差。通过修正喘振线,改造空气压缩机叶轮和换热器,达到了节能环保,稳定运行的目的。     

螺杆式空气压缩机排气温度高原因分析

介绍螺杆式空气压缩机组工作系统,分析螺杆式空气压缩机排气温度高的影响因素,逐项提出了具体的解决方法。     

空气压缩机出口管线开裂的原因分析及处理

对合成氨装置空气压缩机出口管线突然开裂,造成装置停车的原因进行分析,提出解决措施。     

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。