引进大型尿基NPK复合肥生产装置的技术特点

介绍引进大型尿基 NPK复合肥生产装置的工艺流程及技术特点 ,较详细地阐述并剖析了尿基 NPK复合肥的生产难点及高浓度尿液输送、造粒、干燥、尾气处理等工序的技术特点     

引进大型尿基复合肥生产装置的技术特点比较

介绍国内几种引进INCRO公司、KT公司、HYDRO公司的大型尿基NPK复合肥生产装置的工艺流程及技术特点,并分析了尿基NPK复合肥的生产及流程中输送、造粒、干燥、尾气处理等工序的技术特点,以期对我国复合肥技术开发商及生产厂家有所裨益。     

尿基复合肥生产的尾气处理工艺剖析

尾气处理是尿基复合肥生产装置的重要环节,针对尿基复合肥生产的特殊性,剖析了国外三种典型的尿基复合肥生产的尾气处理工艺,结合工程经验,推荐了尿基复合肥工艺的尾气处理流程。     

AZF工艺与高塔熔体造粒工艺生产尿基复合肥的优缺点

介绍AZF工艺与高塔熔体造粒工艺生产复合肥的过程,从原料调节控制、成本、产品养分等方面进行了比较,认为高塔熔体工艺综合成本较高,新建高塔熔体复合肥项目应慎重。     

硝基NPK复合肥的生产技术与市场前景

分析了目前我国复合肥生产、使用现况，论述了硝基NPK复合肥的基本原理、生产特点工艺设计以及消耗情况和市场前景。     

大型硫基NPK复合肥装置工艺技术及特点

介绍我国自行开发的第一套大型硫基NPK复合肥示范装置的工艺流程。该核技术将生产磷酸、磷铵及生产硫酸钾的技术有机地结合起来，可制得规格为15-15-15的粒状硫基NPK皇合肥。该文较详细地阐述了KC1转化制备硫酸氢钾、氨中和、喷浆造粒干燥、固体物料处理、尾气洗涤处理等上序的工艺技太及特点．列举了消耗定额，产品成本、装置投资等技求经济指标。     

硫酸氢钾反应嫁接AZF工艺生产硫基复合肥中试研究

为降低AZF工艺生产复合肥的生产成本,采用氯化钾来代替硫酸钾生产硫基复合肥,对硫酸氢钾反应嫁接AZF工艺进行了中试规模的试验,验证低水含量的混酸料浆输送、管式反应器氨化以及氨化后料浆黏结成粒的性能,同时对该工艺嫁接后的水热平衡进行了分析。试验结果表明,硫酸氢钾与中浓度磷酸混合后的混酸水含量一般为28%,温度一般为90～100℃;造粒过程中管式反应器的氮磷比一般为0.22或0.47;嫁接后工艺的液固比为0.285左右,经干燥机分流20%～40%的液相量后,造粒机内的液固比可以降至较佳造粒液固比。对生产装置进行水平衡与热平衡分析表明,经嫁接技改后的AZF工艺产能不降低,造粒性能良好,无需增加热风炉干燥能力,但需新增干燥机管式反应器。原装置经技改后能达到用氯化钾生产合格硫基复合肥的效果,降低生产成本。     

布袋除尘器在复合肥尾气处理中的应用

分析瓮福化工公司复合肥尾气处理工艺存在的问题。结合公司复合肥生产装置尾气处理工艺整改实际情况,介绍布袋除尘器的除尘原理及用于复合肥尾气处理中的工艺整改方案,简述改造后布袋除尘器生产运行情况。采用布袋除尘器后,复合肥生产装置排放尾气中ρ(粉尘)≤30 mg/m3,符合当地政府新的环保要求,验证了布袋除尘器在复合肥尾气处理中应用的可靠性。     

硝基NPK复合肥的生产技术与市场前景

论述了硝基NPK复合肥生产的基本原理、生产特点、工艺设计、消耗定额以及市场与效益分析。     

硝基NPK复合肥的生产技术与市场前景

论述了硝基NPK复合肥的基本原理、生产特点、工艺设计、消耗定额、市场与效益。     

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。     

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。     

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。     

我国聚碳酸酯工业发展概况

介绍我国聚碳酸酯生产能力和消费需求,对聚碳酸酯在信息工业中的应用作了简短介绍     

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.     

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。     

Effect of degree of deacetylation of chitosan on the kinetics of ultrasonic degradation of chitosan

The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003     

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%.