迷宫斜板沉淀池设计

迷宫斜板也称带翼斜板,是70年代日本发展起来的一种新的固液分离技术。经日本水处理专家丹保宪仁实验研究,证明带翼斜板具有高效稳定的除浊性能。该技术80年代介绍到我国,在重庆自来水公司进行了半生产性试验,在浙江嘉兴自来水公司和哈尔滨自来水公司建造了迷宫斜板沉淀池投入生产运行,取得了良好效果。与斜管沉淀池相比,迷宫斜板沉淀池具有一定特点。本文结合上海市政工程设计研究院工程情况,对较常用的横向流迷宫斜板沉淀池设计作初步探讨。     

选煤厂循环水深度处理新思路探讨

提出一种选煤厂循环水深度处理的新工艺,把循环水池和斜管(斜板)沉淀池相结合,煤泥浓缩池溢流出的循环水进入斜管(斜板)沉淀池的配水区,水流自下而上穿过斜管(斜板)区,循环水中的颗粒会沉降在斜管内,进而滑落至污泥区;净化后的循环水进入循环水池的清水区。     

斜板沉淀池的设计计算

沉淀池是水处理工程中,进行沉降分离的主要装置。斜板沉淀池具有占地面积小,生产能力高等优点,生产中应用较多。本文进行了斜板沉淀池的设计计算。     

斜管沉淀池用无毒硬PVC片材研制

一、前言 在水厂生产过程中,对天然水源进行水质净化处理,即原水加混凝剂后,经过混合反应水中胶体杂质凝聚成较大的矾花颗粒,再通过沉淀池除去。常用的沉淀池有平流式沉淀池、辐射式沉淀池和斜管、斜板沉淀池等。 斜管沉淀池是用一组管道并排叠成一定倾斜度,水从管道的一端流动到另一端,这就相当一个很浅很小的沉淀池。它与目前常用的各类型沉淀池或澄清设备相比较显示     

基于沉后水浑浊度优化目标的中小型水厂侧向流斜板沉淀池改造

针对深圳某水厂斜管沉淀池沉淀效果差、排泥不畅、沉后水浑浊度偏高，最终导致滤池过滤周期短、滤后水及出厂水浑浊度偏高等问题，将斜管沉淀池改造为A型侧向流斜板沉淀池。改造并优化完成后，沉淀池空间利用率更高，运行更加平稳，对原水水质波动的抗冲击能力也有一定提升。对比相同工艺改造前后的水质效果，发现经过改造优化后，因进水导流区及运行死角的消除，沉淀池运行有效容积由74.1%提升至100.0%,沉后水平均浑浊度下降26%,平均值在0.51 NTU,滤后水平均浑浊度下降19%,平均值为0.13 NTU。运行结果表明，A型侧向流斜板沉淀池改造效果显著，适用于存在相似问题的中小型水厂。     

斜板沉淀器在炼钢连铸水处理中的应用

斜板沉淀器在炼钢连铸水处理中的应用承德钢铁集团有限公司设计研究院（河北承德，０６７００２）曹春玲承德钢铁股份有限公司炼钢厂李春和斜板沉淀器是近年来发展起来的新型水处理设备。它与传统的平流沉淀池相比具有占地面积小。沉淀效果好、运行费用及检修费用低和减少...     

用斜管(板)沉降系统改造矩形平流沉淀池--平流斜管(板)组合沉淀池

对矩形平流沉淀池的设计、运行特点和缺陷进行全面评价。论述了用斜管或斜板沉降系统改造矩形平流沉淀池的合理性，同时讨论了设计组合沉降系统的技术关键，以此提高沉淀池出水水质。     

焦化废水处理中斜板沉淀池翻泥原因及解决措施

该文以某焦化厂废水水处理系统物化段为研究对象,对斜板沉淀池的翻泥现象进行分析。结果表明通过改变沉淀池的配水方式及增加压缩空气搅拌等措施,有效地解决了翻泥的问题,保障了生产的稳定性。     

新型同向流斜板沉淀池试验研究

介绍了新型同向流斜板沉淀池处理工艺,分析了新型同向流斜板沉淀池对悬浮物的去除情况,并与传统同向流斜板沉淀池进行比较。中试实验结果表明,新型同向流斜板沉淀池能很好地解决泥水分离问题,不存在传统同向流斜板沉淀池清水收集管易被堵塞现象,而且当表面负荷在30m3/(m2·h)时,SS去除率达98%以上,沉淀效率高于异向流沉淀池,为同向流斜板沉淀池的工程化应用开辟了广阔的前景。     

"迷宫"沉淀池与斜管沉淀池应用比较

根据“迷宫”沉淀池应用中出现的问题 ,提出解决办法 ,同时针对斜管沉淀池进行比较分析 ,“迷宫”池沉淀效率高于斜管沉淀池的效率。并且从各种角度更深入地研究“迷宫”沉淀池和斜管沉淀池     

Two-phase slug flow in horizontal and inclined tubes

Slug flow in the air-water system near atmospheric pressure was studied in a one-half inch diameter tube. Measurements of flow characteristics, pressure gradient, pressure fluctuations, slug velocity and frequency were made for horizontal and inclined flow. A semi-empirical theory based on a simple model was developed. Pressure losses calculated from this theory require a priori knowledge of the slugging frequency. A comparison of the prediction of the theory and two published correlations shows that the proposed theory gives better agreement with the data.     

Stratified turbulent-turbulent gas-liquid flow in horizontal and inclined pipes

A two-dimensional model for stratified turbulent-turbulent gas-liquid flow in inclined pipes is proposed. The gas phase is treated as bulk flow, but an exact solution is carried out for the liquid phase, applying the eddy viscosity theory to model the turbulent viscosity. The interfacial structure is taken into consideration using appropriate correlations for the interfacial shear stress. The model is capable of predicting the liquid velocity field, holdup and pressure drop given gas and liquid flow rates, physical properties, pipe size, and angle of inclination. The results are substantially better than the prediction of Lockhart and Martinelli (1949) correlation and better than the Taitel and Dukler (1976) model for stratified flow.     

Liquid circulation and mixing in an inclined bubble column

Gas and liquid velocities were measured in an inclined rectangular column, at inclinations in the range 0?45° and superficial gas velocities of 0.002 to 0.12 cm/s. Liquid circulation was also characterized by measuring the time to mix a pulse of salt solution in the column. Inclining the column by up to 10° from the vertical induced a drastic change in behavior, from a bubble column with evenly distributed gas bubbles to a segregated system with rapid liquid circulation pumped by rising gas bubbles. The liquid velocities in the inclined column ranged from 10 to 50 times the superficial gas velocity. Further inclination of the column in the range of 10?45° had little effect on liquid velocity or mixing time. A compartmental model for the recirculating liquid flow matched the observed mixing times, but predicted oscillations in tracer concentration which were not detected in experiments.     

Modeling slug flow and mass transfer in inclined pipes

An experimental and numerical study of the gas projectile mass transfer when moving in an inclined pipe has been carried out. The mathematical model is based on the smoothed particle hydrodynamics method and verified by experimental data. The dependence of the velocity of the gas projectile motion and effective dimensionless mass transfer coefficient on the pipe inclination angle has been found. The simulated and calculated from experimental data bubble profiles have been compared.     

倾斜窄矩形通道中气弹运动速度

利用高速摄像系统,对4种倾角下窄矩形通道(3.25 mm×40 mm)内弹状流进行了可视化研究。实验中发现,低流速时,倾斜条件下,由于浮力的影响,气弹头部偏离管道中心,头部变尖,因而气弹运动速度加快,系数C₀随倾角增加而减小,漂移速度V₀呈相反变化趋势;高流速时,流动趋于稳定,倾角对气弹速度影响不显著,对C₀和V₀影响较小。通过实验数据评价了竖直条件下4种气弹速度计算关联式。以Froude数3.5为界,分别提出了倾斜条件下C₀和V₀计算关联式。     

Velocities of extended bubbles in inclined tubes

The velocities of extended bubbles (slug flow bubbles) have been measured in inclined circular tubes. Eötvös numbers ranged from 4.9 to 490 and Morton numbers from 2.2 × 10⁻¹¹ to 1.5 × 10⁴. The Froude number for any angle of inclination was correlated as a function of angle and the values of the Froude numbers for the horizontal and vertical orientations.     

Drop coalescence on inclined plates in liquids

Inclined plates are often installed as mechanical separation aids in gravity settlers for the separation of liquid-liquid systems. The authors investigated the process of coalescence of single drops on trickling films flowing off inclined plates. The method of investigation was developed by Blass and Rautenberg. It ensures that, under certain conditions, only hydrodynamic parameters influence the coalescence process to any significant extent. The coalescence time of the drops characterizes the process of coalescence. Short time between 1 and 3 seconds provide favourable conditions for coalescence whereas long times, often ten times as long or even longer are unfavourable. This contribution introduces a criterion for clear demarcation between these two ranges and also a determination of separation parameters for favourable conditions for coalescence. Furthermore, the function of the plates is described, which is determined by hydrodynamic and wetting processes. The characteristic operating regions of a plate are shown in a working diagram.     

Sliding in inclined slurry pipelines at shutdown

The sliding phenomenon which is reported to impose a restriction upon the slope of slurry pipelines is investigated experimentally. Two different types of behavior which could be called “sliding” were observed. At pipe inclianations greater than 22° to the horizontal, fully settled layers of solid particles would slide with shear occurring at or near the pipe wall. The critical angle of inclination increased as the particle size decreased. When the slurry was not fully settled, a natural convective flow process was observed to move the slurry down a pipe incline. This flow occurred at much lower pipe inclinations. Concentration profiles measured near the bottom of a pipe incline showed little effect of slurry type or concentration, provided the slurry contained a significant amount of slowly settling solids. In this case, pipe slope was the most important variable.