冷凝液泵叶轮损坏原因分析

热回收系统通过换热器将水煤气中的水蒸气冷凝下来,之后冷凝液通过冷凝液泵加压返回到气化装置水洗塔内,用以洗涤水煤气。原始开车过程中,2台冷凝液泵均出现叶轮损坏而无法正常运行的情况,经分析与探讨,认为NH_4HS腐蚀是叶轮损坏的主要原因,而冷凝液泵发生汽蚀是叶轮损坏的次要原因。采取相应的措施后,冷凝液泵运行状况良好。     

变换工序的技术改造及优化操作

以实现甲醇变换工序长周期稳定运行为目的,对该工序工艺冷凝液管道振动大、工艺冷凝液泵机械密封频繁损坏、煤气过滤器压差增大的原因进行分析,通过对工艺冷凝液管线、泵的密封水系统的改造,过滤剂的更换,气化碳洗塔系统的优化操作,解决了制约该工序长周期稳定运行的根本原因,达到了预期效果。     

一种新型焦炉煤气冷却装置

正本实用新型涉及焦化厂煤气冷却系统技术领域,一种新型焦炉煤气冷却装置,包括初冷器、焦油氨水分离装置、冷凝液泵,初冷器与焦油氨水分离装置相连接,焦油氨水分离装置连接冷凝液泵,冷凝液泵与初冷器相连接。所述的初冷器的上段与焦油氨水分离装置相连接,所述的冷凝液泵与初冷器的上段相连接。与现有技术相比,本实用新型的有益效果是:取消了初冷器上段冷凝液槽和水封槽,上段冷凝液自流到机械化氨     

冷凝液泵机械密封选型探索及安装

根据冷凝液泵的轴承箱及机封冷却水等外在条件,探索适合于变换冷凝液泵的机械密封,从而保障泵的长周期运行。     

有多少冷凝液闪蒸?

<正> 从化工厂各生产装置中出来的蒸气冷凝液通常要回收利用。用管道将冷凝液送到不同的蓄水箱,蓄水箱出来的管端插入到一个收集器,收集器出来的冷凝液用泵打回到锅炉系,统供产生蒸汽而组成一个典型的冷凝液收集系统。冷凝液在降低压力时,随时都可闪蒸产生蒸汽。压降使冷凝液的熔值变低。该熔降消耗于冷凝液闪蒸成蒸汽时。要计算冷凝液的回流管道、蓄水箱、收集器,必须要知道冷凝液闪蒸后产生的蒸汽量。本列线图能快速确定在低压下冷凝液闪蒸后产生的蒸汽量。它以熔平衡为基础,在已知初始压力和最终压力条件下,给出计算冷凝液闪蒸成蒸汽的重量百分数。公式如下:     

立式冷凝泵故障排除

大唐克旗煤制天然气公司甲烷化首站界区两系列共八台冷凝液泵（全部为立式离心泵）,其中一个系列有两台疏水泵、两台凝结水泵,疏水泵的作用为将汽轮机集液箱中凝结水打至热井中;凝结水泵的作用为将热井中冷凝液加压排至全厂冷凝液管网。     

一种新型焦炉煤气冷却装置

<正>本实用新型涉及焦化厂煤气冷却系统技术领域的一种新型焦炉煤气冷却装置,包括初冷器、焦油氨水分离装置、冷凝液泵,初冷器与焦油氨水分离装置相连接,焦油氨水分离装置连接冷凝液泵,冷凝液泵与初冷器相连接。与现有技术相比,本实用新型的有益效果是,取消了初冷器上段冷凝液槽和水封槽,上段冷凝自流     

冷凝液泵开启出口阀振动高故障分析与处理

中海石油华鹤煤化有限公司300 kt/a合成氨装置合成气压缩机组汽轮机系统冷凝液外送配套2台单级单吸悬臂式离心泵(冷凝液泵A/B,一开一备),实际生产中,冷凝液泵A一直运行正常,而冷凝液泵B启动后打开出口阀即发生异常振动故障,采取各种检修处理措施均未能解决该问题,B泵只能用作紧急备用设备。后经技术人员的不懈努力,采用频谱分析仪采集B泵的振动频谱,通过对其振动频谱图及与A泵进行对比分析,最终确定B泵故障原因为叶轮直径过大以及叶片与蜗舌间隙过小,2022年利用系统大修机会调整B泵叶轮直径及叶片与蜗舌间隙后,成功解决了长期以来的技术难题,保障了合成氨装置的安全稳定运行。     

初冷器冷凝液喷洒系统的改造

我厂初冷器上、下两段的冷凝液分别经φ200／150ram的液封管进入各自水封，经φ150mm出口管由水封槽进入冷凝液槽，再用冷凝液泵抽送至初冷器上、下段喷洒，部分冷凝液由上段冷凝液泵送入吸煤气管，以保持系统的液相平衡。     

冷凝液泵常见故障原因及解决措施

冷凝液泵是多级离心泵的一种,在化工企业普遍使用。主要阐述了冷凝液泵在使用过程中常见的5种故障及其解决措施。     

乙烯酮(双乙烯酮)下游产品废水的治理技术

乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。     

三种煤样燃烧热的测定

本文通过三个厂家提供的三种煤样燃烧热的测定,由测定结果综合得出3号煤样燃烧最完全、燃烧热也最大,是三个煤样中最好的一种。     

Effect of degree of deacetylation of chitin on the properties of chitin crystallites

In the present article, chitin from crab shell was systematically deacetylated using a NaOH treatment with control of the reaction time. The degree of deacetylation, monitored using solid-state NMR, revealed that the reaction was pseudo-first order. Based on this, swollen and NaOH-saturated particles are proposed as the reaction system. The weight loss of the partially saponified and neutralized samples after HCl hydrolysis increased linearly with the degree of deacetylation. The crystallinity of the samples was found to increase after acid hydrolysis. According to conductimetric titration, the surface charge density of the crystallites, after acid hydrolysis, was found to increase with base treatment time. The effect of surface charge on the formation of a chiral nematic phase, due to the rodlike nature of the crystallites, was explored. These results show that because the contribution of charged particles to the ionic strength was significant the double layer compression was affected, especially since the surface charge density was close to the Manning limit. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:373–380, 1997     

农药分子半抗原合成的研究进展

农药分子半抗原的合成直接影响后期制备抗体的质量,对于建立农药分子特异、灵敏的免疫分析方法具有关键性作用。综述了国内外农药人工抗原合成过程中的农药分子半抗原的设计原则、合成方法及影响因素等方面的研究进展。     

气化给煤系统故障分析

气化给煤装置自投运以来,出现了气化煤仓堵煤、称重给煤机输送皮带因跑偏而损伤以及清扫装置故障频繁等问题,多次造成气化系统减负荷运行。通过对出现的各种问题进行分析,找到了产生这些问题的原因,并有针对性地采用配煤和改进清扫链等措施,使出现的问题得到了极大的改善。     

Semi-empirical equation of state of metals. Equation of state of aluminum

A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO₂) of density 0.08 g/cm³. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008.     

磁敏橡胶材料弹性模量的测试与研究

研究了磁敏橡胶超声测试的基本方法和参数,测量了各向同性和颗粒成链磁敏橡胶材料的纵向模量。对含铁颗粒填料体积分数不同的磁敏橡胶样本进行了三点弯曲试验,计算出磁敏橡胶样本的弹性模量,并与相关理论预测模型进行了对比,结果表明,对于各向同性磁敏橡胶,随着含铁颗粒填料体积分数的增加,其弹性模量和剪切模量增大。颗粒成链磁敏橡胶的弹性模量很大程度上依赖于测量的方向,含铁颗粒填料体积分数超过15 ％时,在平行和垂直于颗粒链方向所测得的弹性模量有显著的不同。这是因为含铁颗粒填料体积分数超过15 ％时,磁敏橡胶的颗粒成链结构不具有立体对称性。     

Measurement of the gradient of viscosity with composition of mixtures of non-ideal gases

A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%.     

邢钢套筒窑换热器内漏生产实践

介绍了套筒窑换热器的工作原理、作用及邢钢套筒窑换热器内漏的判断依据,对套筒窑换热器内漏的原因进行了简要的分析,对内漏前后的主要参数进行了对比,同时结合实际生产情况,制定了行之有效的控制措施,收到了良好的效果。     

塔设备改造选型的分析

就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后，着重介绍一种新型塔板（导向梯形浮阀塔板）和一种新型填料（波环填料——乾隆帕克）。