金昌冶炼厂硫酸车间净化工系列技改实践

对原有两套烟气净化系统中的一套进行改造。去除原电除雾器前的混气装置,在空塔前增设混气塔,使两套系统具有相同的烟气条件。原１系列采用７６％热浓酸洗涤净化工艺,流程为空塔－填料塔－电除雾器;现改为稀酸净净化工艺,流程为空塔－高效洗涤器－料塔（板式酸冷却器）－电除雾器。改造后生产运行正常,各项净化指标均达到工艺要求。     

金昌冶炼厂硫酸车间净化Ⅰ系列技改实践

对原有两套烟气净化系统中的一套进行改造.去除原电除雾器前的混气装置,在空塔前增设混气塔,使两套系统具有相同的烟气条件.原Ⅰ系列采用76%热浓酸洗涤净化工艺,流程为空塔-填料塔-电除雾器;现改为稀酸洗净化工艺,流程为空塔-高效洗涤器-填料塔(板式酸冷却器)-电除雾器.改造后生产运行正常,各项净化指标均达工艺要求.     

信息拾零

云 南祥云飞龙实业有限公司化工冶炼厂 1 5ｋｔ/ａ硫酸装置于 2 0 0 0年 8月下旬顺利投产。该装置以硫化锌精矿为原料 ,经沸腾炉氧化焙烧产出焙砂、烟尘和烟气 ,焙砂和烟尘经湿法冶炼生产锌锭 ,烟气经炉气冷却器、两级旋风除尘器及电除尘器后进入制酸系统生产硫酸。炉气冷却器采用自然循环方式产低压蒸汽用于湿法炼锌和职工生活。硫酸装置采用二级洗涤器、气体冷却塔和一级电除雾器净化 ,“3+ 1”两转两吸转化流程。净化系统的设备和气体管道全部采用ＦＲＰ(电除雾器为Ｃ -ＦＲＰ)制造 ,稀酸管道材质为ＵＰＶＣ ,稀酸冷却器为板式换热器。转…     

瑞典硫酸工业见闻

介绍了瑞典主要硫酸生产厂家波立顿冶金公司铜、铅系统混合烟气制酸装置和波立顿化工公司含0.2％As的硫铁矿制酸装置。重点叙述了SX不锈钢酸冷却器、不锈钢电除雾器和焙烧高砷矿生产硫酸并回收砷的技术。     

高海拔对硫酸装置的影响分析

介绍我国目前已知海拔最高(3 100m)的80 kt/a硫精矿制酸装置的设计及运行中遇到的问题。装置采用沸腾焙烧、文-泡-间-一级电除雾器酸洗净化、ⅢⅠ-ⅣⅤⅡ“3 2”两转两吸工艺。因为空气稀薄、大气压力低、昼夜温差大,在电气设备(如电除尘器和电除雾器)、炉气二氧化硫浓度控制、设备选型和防紫外线老化等方面采取了一定的措施。装置运行良好。     

金隆冶炼烟气制酸装置的运行情况

一年来生产实践表明，金隆公司冶炼烟气制酸系统的设计，施工及引进技术与装备都是非常成功的。动力波系统对波动量较大的烟气有很高的除尘效率和较高的适应性。电除雾器，ＳＯ２鼓风机，转化器，换热器，ＭＥＣ纤维除雾器，ＳＸ管槽式分酸器，阳极保护浓硫酸冷却器的均运行正常。     

改造填料塔 完善净化工艺

１８０ｋｔ／ａ冶炼烟气制酸装置采用绝热增湿冷却、稀酸移热净化、两转两吸工艺。因填料塔净化效果较差,影响了电除雾器的正常运行,故对填料塔的分酸装置、捕沫器进行改造,效果良好。     

商洛炼锌厂180kt/a锌冶炼烟气制酸装置设计与生产实践

介绍了商洛炼锌厂120 kt/a电解锌工程配套180 kt/a制酸装置的设计和实际运行情况。制酸装置采用高效洗涤器—填料冷却塔—2级电除雾器稀酸洗净化、ⅢⅠ-ⅣⅡ"3+1"二转二吸工艺流程。自投产以来,生产基本正常,进转化器烟气φ(SO2)6.5%左右时,转化率为99.8%,排放尾气ρ(SO2)≤500 mg/m3,主要生产指标优于设计值。针对转化工序热量富余和一吸塔循环酸温度过高问题,采取增设热管省煤器、增大一吸酸冷却器换热面积的方式加以解决,改造后装置运行指标得到优化。     

厦门化肥厂硫酸装置技改回顾

介绍该厂硫酸装置技改情况：原沸腾炉外壳内衬进行修补,有效内径由２．５ｍ扩大到２．６ｍ,风帽孔径从５．５ｍｍ扩大为６．０ｍｍ;净化系统泡沫塔改为填料塔,第二文氏管改为电除雾器;制酸系统酸冷却器由淋洒式铸铁排管改为阳极保护管壳式浓硫酸冷却器。技改后系统阻力降低,生产能力提高,生产成本降低,获得较好经济效益。     

金隆铜业公司冶炼烟气制酸系统的引进技术与装备

介绍了金隆铜业公司铜冶炼烟气制硫酸装置的概况。重点分析了该系统的引进技术与装备。其中主要有动力波洗涤器、阳极保护管壳式浓酸冷却器、纤维除雾器、ＳＸ槽式分酸器、路易斯泵、板式成品酸冷却器、ＭＥＣ催化剂、ＭＥＣ设计的转化器与换热器、ＳＯ２鼓风机、拉罗克斯压滤机、道尔·奥利弗离心分离机、艾姆克圆筒过滤机等。这些设备对配合冶炼系统的运行,保证整个系统的正常运转,起到了十分重要的作用。     

Mesomorphic transitions in a mixture of a flexible and a semi-rigid polymer

Phase studies on a mixture of two polymers are presented, one of which is mesomorphic. We have systematically examined the influence of the molecular weight of the flexible polymer (including the oligomers) and of the semi-flexible polymer. In addition to the effect of the molecular weight, specific interactions are important for compatibility and formation of a homogeneous mesomorphic phase. The nature of this phase is demonstrated to be cholesteric and the pitch is determined.     

Extraction into a flow of a fluid with a velocity gradient

Unsteady extraction from a system of semi-infinite capillaries to the flow of a fluid with a linear velocity gradient is studied. An assumption that the diffusion in the flow is a quasi-steady-state process is taken to obtain a linear equation for the local mass flux from the pore space, which involves fractional derivatives with respect to time and flow coordinate. Limiting solutions for the total diffusion flux at small and large times that cover the entire time interval are found.     

Electrolytes: From a Thorn Comes a Rose,and from a Rose,a Thorn

In this article we take a stroll through the metaphorical rose garden, part of the flower garden, that is electrochemical storage systems. We take a closer look at batteries as the center‐pieces – the roses – and especially at the system component of batteries, the electrolyte and its development, throughout history. Just as a rose can only develop its unique beauty when taken good care of and provided with clean water and suitable nutrients, a battery cell cannot function without its electrolyte; the seemingly trivial component that has to juggle a multitude of requirements in order to make batteries truly bloom.     

Detonation of a Column of a Chemically Active Bubbly Medium in a Liquid

The problem of a detonation wave propagating in a cylindrical column of a chemically active bubbly medium screened by a liquid from the tube walls is formulated and numerically solved within the framework of the Iordanskii–Kogarko two-phase model with allowance for energy dissipation due to acoustic radiation of bubbles. The wave structure of the reaction zone and the detonation velocity of the bubbly medium column are calculated. It is found that the self-sustaining wave can propagate with a velocity greater than the velocity of one-dimensional bubble detonation by a factor of 1.5–2.5.     

Propagation of a burning front over a condensed material from a focus

Measured propagation speeds are given for the combustion front in a blind gap in a condensed substance, which are related to gap height and mean pressure. The front may propagate monotonically, which is characteristic of relatively high pressures and wide gaps, or as a result of additional burning foci arising at a certain distance from the main front. At low pressures and particularly with small gap heights, the front propagates in an unstable fashion over the surface.Moscow. Translated from Fizika Goreniya i Vzryva, Vol. 28, No. 4, pp. 49–53, July–August, 1992.     

Drag of a cylinder moving near a wall in a yield stress fluid

The drag of a cylindrical obstacle moving at a constant velocity in a yield stress fluid close to a wall is studied experimentally and numerically. The wall influence has been explored for gap values between the cylinder of diameter D and the wall ranging from 0.01D to 100D, which corresponds, respectively, to hydrodynamic lubrication and to unconfined domain conditions. A model yield stress fluid (Carbopol gel) is used in the experiments. The viscous and plastic drag coefficients have been calculated and measured as depending on the Oldroyd number, in conditions where the yield stress effects are more important than those of viscosity and the inertia negligible. We have performed experimental and numerical validations in the Newtonian case and provided more specifically comparisons of our measured data on yield stress materials with those resulting from viscoplastic flow simulations. © 2018 American Institute of Chemical Engineers AIChE J, 64: 4118–4130, 2018     

When is a Beam a Plate?

Formulas associated with simple beam or plate theories are used extensively in structural design, to determine You's modulus, and to determine fracture strength of brittle nonmetallic materials. The question may arise as to whether the proper ratio of beam-width-to-beam-depth is such that the bent structural element can be considered as a beam and, if not, what is the correction factor that should be used with the simple beam formula. These questions are answered for a range of structural metallic and brittle nonmetallic materials.