圆盘真空过滤机的改造

汾西矿业集团选煤厂针对PG116型真空过滤机存在的水分偏高、脱饼率低等问题,进行了三次改造,改造后均取得了良好的使用效果,过滤机能耗降低,工艺操作水平提高,脱水效果改善,工人的劳动强度降低,工作环境改善。     

加压过滤机在淮北选煤厂(北区)的应用

介绍了加压过滤机和圆盘真空过滤机在浮选精煤脱水方面的工艺特点;通过对两种压滤机进行对比,表明加压过滤机具有过滤强度大、过滤速度快、生产效率高、产品水分低、滤液浓度低、噪声低和能耗低等特点;指出了加压过滤机在实际应用中常见问题及解决措施。     

GPJ60·3型加压过滤机在八一选煤厂的应用

论述了ＧＰＪ６０·３型加压过滤机在八一选煤厂的运行情况及目前存在的问题。     

圆盘真空过滤机的改进与氟面脱水

<正> 一、引 言 普通园盘真空过滤机在选矿和选煤上使用已有一定时间,此外它还可用于氢氧化铝和纸浆生产。园盘过滤机能够适应处理量大的要求,同其他过滤机(如转鼓真空过滤机,带式过滤机等)相比,它更能适应连续加压过滤工艺的要求。而连续加压过滤工艺变得越来越重要,在选矿工业的应用正日益增多。 普通园盘过滤机的结构特点是:扇面数少,浸没深度浅和滤液通道尺寸不够。由此     

浮选精煤加压过滤机入料泵安全运行的措施

望峰岗选煤厂精煤加压过滤机入料泵因上料极少、加压仓内的高压混合气体反吹到入料泵内等原因导致了炸裂事故,为此采取了出料管上增设压力传感器、入料池上方加装摄像头等多项控制措施,有效避免了产生爆燃的条件。     

加压过滤机用于选煤厂浮选精煤脱水

介绍了６０ｍ~２加压过滤机的研制和应用情况，并通过与圆盘真空过滤机相比较证明，加压过滤机用于浮选精煤脱水具有很多优点。     

加压过滤机的几点改进措施

介绍了加压过滤机工作原理和特点,在保障其生产处理量大、脱水效率高的同时,查找缺陷,进行技改,取得了较好的经济效益和产品质量。     

盘式真空过滤机改进及效果

介绍了盘式真空过滤机的发展现状 ,在作业中存在的问题 ,改进及其效果     

马头选煤厂应用GPJ-60A型加压过滤机的实践

介绍了GPJ-60A型加压过滤机的主要结构及特性参数,总结了加压过滤机调试及正常生产过程中的常见故障及解决办法;马头选煤厂的运行实践表明,加压过滤机的滤饼水分低,处理量大,滤液浓度低,为选煤厂带来了可观的经济效益和社会效益。     

GPJ-120加压过滤机的维护与改进

介绍了望峰岗选煤厂使用的GPJ-120型加压过滤机的工作原理、技术特征,针对使用过程中存在的工作压力低、接近开关误动作、气动阀门使用寿命短、气水分离器分离效果差等问题,分别采取了有效的改进方法,确保了生产的平稳运行,实现了节能降耗目标,取得了很好的经济和社会效益。     

过滤机卸饼方式的改进

介绍了选煤厂真空过滤机的卸饼现状 ,提出了将“随动刮刀”与“强力反吹”两种卸饼方法相结合的设计改进方案 ,这种卸料方式简单 ,运用灵活 ,行之有效     

圆盘真空过滤机主要结构的改造

为了解决原真空过滤机使用过程中存在的问题 ,采用橡胶滤片代替原塑料滤片 ,用新设计的焊接管束代替原来的铸造空心轴 ,省去了瞬时吹风系统 ,滤饼脱落率达 98%以上 ,滤饼水分降低 ,提高了生产效率 ,降低了生产成本 ,取得了明显的经济和环境效益     

Improvement of anti-erosion performance of TiN coatings through using a filtration cathode vacuum arc deposition method

Sand erosion is a major factor that shortens the service life of aircraft in desert regions. The anti-erosion performance of titanium alloys may be improved using TiN coatings. However, few studies have employed Ti sputtering on Ti transition layers to improve the erosion resistance of the coatings. Herein, TiN coatings with a sputtering layer between the Ti transition layer and the TiN layer were deposited on a Ti–6Al–4V alloy by filtered cathodic vacuum arc deposition. For comparison, another group of TiN coatings without a Ti sputtering layer but processed using the same deposition parameters were prepared. The effects of the nanoscale sputtering layer on the microstructure, mechanical properties, and anti-erosion performance of the coatings were investigated using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and nanoindentation. The results show that the introduction of a Ti sputtering layer promoted the growth of TiN grains, leading to the formation of finer and denser TiN columnar grains. The preferred orientation of the coatings with the sputtering layer is (111) plane, whereas that of the coatings without the sputtering layer is (200) plane. The TiN coatings containing a sputtering layer exhibit higher hardness, elastic modulus, and H³/E² ratio, which enhances the anti-erosion performance of the coatings. The coatings with a sputtering layer exhibited better erosion resistance (erosion rate reduced by 75%) than the coatings without a sputtering layer. The underlying mechanism to understand the effect of the sputtering layer on the erosion resistance was discussed based on variations in the microstructure and mechanical properties of the coatings with and without the Ti sputtering layer. Ti sputtering layer was finally proved to be an effective method to improve the erosion resistance of TiN coatings.     

Modeling unsteady filtration performance of pleated filter

The dust loading has a significant influence on the transient performance of air filters. This study developed two models based on the Lagrangian and Eulerian methods to simulate the unsteady filtration process in the pleated filter. The flow field through the filter was calculated by solving the Navier-Stokes equation with the DES-SA turbulence model. The filter media and the cake layer were modeled as the porous zone. The Lagrangian method tracked the particle trajectories to model the particle motion, but the Eulerian model treated the particle as continuous phase. Two cell models were proposed to simulate the transient particle deposition and the cake layer growth on the filter medium surface for the Lagrangian and Eulerian methods, respectively. The simulated results were validated by the available experimental data. Both of the methods could provide relative accurate results with acceptable error. But the computing speed of Eulerian model was faster than the Lagrangian method. Otherwise, the new developed Eulerian model was used to investigate the effect of dust loading on the optimal design of pleated filter.

© 2016 American Association for Aerosol Research     

纤维素助滤剂的预敷过滤性能

对高黏度物料加入纤维素助滤剂的预敷过滤性能进行了研究,说明不同的预敷条件对预敷层的过滤性能会有很大影响。通过改变预敷压力和浓度,对纤维素滤饼层的过滤比阻、可压缩性系数和孔隙率进行了研究。实验表明,纤维素预敷层的比阻随压力增加而增加,随浓度增加而减小;孔隙率随压力增加而减小,随浓度增加而增加;可压缩性系数随浓度增加而增加。纤维素助滤剂为中等可压缩性物料,孔隙率大。研究结果可为高黏度物料用纤维素预敷过滤的工程应用提供参考。     

Effects of filter additives on cake filtration performance

Effects of various additives, such as diatomaceous earth, inorganic adsorbent, and polymeric flocculant, on cake filtration performance were evaluated. By performing the standard vacuum filtration experiments under a constant pressure condition, we quantified their ability to reduce cake compressibility and to remove fine particulate matters. From the flux decline curves obtained, we used modified Ruth equation to determine the cake compressibility index. The filtrate clarity was quantified by measuring its turbidity spectrophotometrically. Diatomaceous earth filter aid was very effective in reducing the compressibility thereby improving filtrate flux. Calcium phosphate adsorbent was more effective in clarity improvement than in flux enhancement, whereas an anionic flocculant was effective in both aspects. When these additives were used together, the expected additive, synergic effect was not realized. However, about 3.5 times higher initial flux and 6-fold improved clarity were obtained as compared to the control experiment. Experimentally obtained flux decline curves were perfectly fitted into one of the Hermia’s blocking filtration law equations. Also, it was experimentally observed that the compressibility reduction improved filtrate clarity in a linear fashion. This type of approach is useful to quantitatively determine each additive’s characteristics and thus to maximize the performance of cake filtration operations.     

Specific energy consumption of vacuum filtration: Experimental evaluation using a pilot-scale horizontal belt filter

Abstract

Horizontal vacuum belt filters are used for continuous solid–liquid separation in a wide variety of industrial processes. Despite the low pressure difference (usually Δp?<?0.8?bar), the high air pumping requirement to maintain the pressure difference results in considerable energy consumption. In this article, the specific energy consumption of vacuum filtration and air flow rates of a pilot-scale horizontal vacuum belt filter unit are investigated. The results show that a claw-type vacuum pump consumes only half the energy compared to a conventional liquid ring vacuum pump at corresponding operating points. A comparison between the specific energy consumption of vacuum filtration and thermal drying of the filter cake to zero moisture revealed that vacuum filtration accounted for less than half of the total energy consumption in the applied experimental conditions at Δp?=?0.2–0.5?bar. The majority of the total pumping requirement of the pilot-scale filter resulted from leaks, and only 2–25% of the air flow found its way through the cake and the filter medium. The results suggest that there is a combination of the pressure difference level and the mass of solids deposited per filtration area that together with thermal drying consumes the least amount of energy per solids mass.     

折叠滤芯气液过滤性能测试及优化

采用聚结型滤芯气液过滤性能实验装置,研究了油雾加载率和表观过滤速度对折叠滤芯过滤性能的影响及涂覆粘合剂对折叠滤芯过滤性能的优化作用。结果表明,涂覆粘合剂后,滤材抗张力强度明显增大,滤材孔径减小。随油雾加载率增大,滤芯过滤层液体运移通道数增加,通道压降升高。初始压降随表观过滤速度增加而升高。粘合剂主要凝固在渗透性低的区域,压降变化较小。表观过滤速度增加抑制了二次夹带,折叠滤芯过滤效率升高,而由于粘合剂脱落,涂覆粘合剂的滤芯过滤效率下降。表观过滤速度为0.10 m/s时,随油雾加载率增大,聚结在滤材表面的粘合剂抑制夹带,滤芯过滤效率升高。