尿素装置原始开车总结

介绍改进型二氧化碳汽提法尿素装置原始开车情况,针对装置在原始开车时遇到的问题进行分析总结,提出相应技术改造措施。     

800 kt/a大颗粒尿素装置原始开车技术改造

介绍了800 kt/a大颗粒尿素装置原始开车过程中出现的工艺问题,重点阐述了甲醛添加剂系统、回收尿液流程、尿液总管过滤器、水系统及尿液总管采取的改造措施.改造后,顺利完成了装置的原始开车工作.     

氨汽提尿素工艺高负荷稳定运行技术改进

简要介绍尿素装置从原始开车至现在，经历了相关设备的技术改造，制定了科学的控制方法，解决了制约尿素装置稳定运行的关键问题，增强了装置的操作弹性，确保了装置安全稳定运行。     

尿素装置高压甲铵泵运行情况浅析

介绍了自尿素装置原始开车以来,甲铵泵运行情况及运行中出现的问题及处理措施。     

尿素蒸发系统故障剖析与技术改造

针对尿素装置原始开车时蒸发系统尿液泵、熔融尿素泵打量波动大,一段、二段蒸发出液温度波动大,成品尿素缩二脲含量高,成品尿素粉料大包装料斗下料口易堵塞等问题,分析与查找原因,提出相应的技改方案,实施后收到了良好的效果。     

晶种循环流程的改进

晶种料斗在大颗粒尿素装置中的作用是：①原始开车时由晶种提升机加晶种至晶种料斗;②准备开车时晶种由晶种料斗经晶种大循环至造粒机;③停车前晶种切至晶种料斗储存。     

中压系统运行中的问题及解决办法

介绍建峰化肥厂尿素中压分解回收系统的运行情况，分析原始开车以来，运行中出现的问题，提出优化装置运行的解决办法。     

中压甲铵冷凝器改造总结

我公司尿素装置是从意大利斯纳姆公司成套引进的大型尿素生产装置，采用氨汽提工艺技术。中压甲铵冷凝器E106是氨汽提法尿素装置中压系统的关键设备，其运行好坏直接影响中压吸收塔的吸收效果。为了使其达到良好的运行状态，自原始开车以来进行过多次改造，现总结如下。     

18万m~3/h全低变原始开车总结

介绍了山东大化化工科技有限公司新上大型低压合成氨30-52装置的设计内容、设计参数、工艺流程、主要设备,该装置采用了2.3 MPa(a)全低变的原始开车方案,于2013年8月17日一次开车成功;阐述了原始开车催化剂装填方案、升温硫化;分析了原始开车及正常开车中异常现象的原因,并提出了处理方法。     

CO2气提法尿素工艺技术的改进

黑龙江化工总厂日产８７０ｔ尿素装置采用荷兰斯塔米卡邦公司的ＣＯ２气提法生产工艺,由该公司提供工艺软件包,由中国五环化学工程公司承担基础工程设计,国内配套生产关键设备,仪表国外采购,生产过程采用ＤＣＳ控制。本装置在工艺路线、设备结构、原始开车技术方面与８０年代引进的１４套ＣＯ２气提法尿素装置有一定区别,尤其在原始开车技术、合成塔塔板上有较大改进。本文就该装置的工艺技术改进作简单介绍。１　工艺技术改进１１　用常温精脱硫催化剂脱除ＣＯ２气体中硫化物进尿素区ＣＯ２原料气最大气量１６０００ｍ３／ｈ,原料…     

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。     

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.     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

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。     

Calorimetric and Computational Study of Enthalpy of Formation of Diperoxide of Cyclohexanone

A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out.     

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。     

小议汽车涂装工艺设计对涂装成本的影响

论述了涂装工艺设计对涂装设备投资、涂装生产成本的影响。     

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%.     

醋酸纤维素取代基分布与性质的关系

分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。