牡蛎酶解液分离方法的研究

对牡蛎酶解液的絮凝和分离方法进行了研究,结果显示:调节酶解液的pH至4.5～5.0,加热到85℃保持15min,后降温至60℃,采用碟式分离机进行离心,当转速为9360r/min,流量为200L/h,排渣时间为15min时,可去除86%以上的杂质,离心前后氨基态氮指标变化不大,可降低约25%的挥发性盐基氮,有效地提高了牡蛎酶解液的风味,达到后工序对酶解液的品质要求。本文也采用等水平均匀设计法确定了各因素的影响效果:离心流量pH絮凝时间絮凝温度。     

动力用阀控式铅酸蓄电池的研究进展

介绍了动力用阀控式铅酸蓄电池的研究进展,包括了电池板栅的合金选择、板栅设计、正负活性物质的配方、电解液配方、隔板材料等方面的进展,提出了动力用阀控式铅酸蓄电池的研究发展方向。     

不同工艺制备的锂离子电池用隔膜的热性能

分析了静电纺丝、单向拉伸和双向拉伸等工艺制备的4种锂离子电池隔膜的热收缩、孔隙率和透气性等随着热处理温度和时间的变化.随着温度的升高,单向拉伸与双向拉伸隔膜在机械方向的热收缩率增大,静电纺丝隔膜减小;孔隙率均有降低的趋势;透气性在测试温度范围内(80～95℃)先升高,后降低.静电纺丝和双向拉伸隔膜在热处理4h后达到收缩...     

Hierarchical self-assembly of tannic acid/diethylenetriamine on polypropylene for high-performance separator

In lithium-ion batteries (LIBs), separator is used to provide a barrier between the anode and cathode and provide freedom for the transport of lithium-ions, which serves a key function in inhibiting internal short circuit and improving the battery safety. The limited wettability of commercial polyolefin separators in electrolytes restricts its utilization in extreme environmental conditions. In our work, we choose polypropylene (PP) as the precursor and can address the issue of poor wettability through suitable modification methods. Tannic acid (TA) and diethylenetriamine (DETA) were utilized to coat PP separator via hierarchical self-assembly approach, and the coating is further stabilized by taking advantage of the specific oxidizing properties of sodium periodate. This method scarcely increases the separator thickness or sacrifices the microporous structure of the original separator. The improved separator not only exhibits outstanding wetting capability and relatively high ion conductivity (1.24 mS cm⁻¹), but also has the highest lithium-ion migration number of 0.74. This indicates that when the modified separator is applied to LIBs, its electrochemical performance is significantly enhanced. The enhancement in electrochemical performance of LIBs is attributed to the strong absorption and retention ability of the coating on the separator. The reversible capacity of Li/PP-TD2 separator/LiFePO₄ battery is 144.3 mAh g⁻¹ at 2C, which is higher than that of PP separator (117.1 mAh g⁻¹) under the same current density. Even after 200 cycles, the PP-TD2 separator with two-layer assembly modification still maintains a higher coulombic efficiency of 97.55% and a discharge capacity of 96.6%. This hierarchical self-assembly modification of PP provides an effective approach for fabricating high-performance separator.     

钻井柴油机尾气净化装置研制

石油钻井柴油机的尾气中含有碳烟颗粒(PM)和氮氧化物(NOX),对环境造成了严重污染。采用静电旋风分离原理设计了柴油机尾气净化装置,介绍其结构和工作原理。该装置结构简单、阻力小、过滤效率高、捕集粒径范围宽、能耗低,能够有效降低钻井用柴油机尾气中的PM和NOX,具有较好的经济效益和社会效益。     

轴向涡流分离器工作机理及机筒最佳锥角研究

为了研究轴向涡流分离器的结构和分离机理,促进该技术在国内的推广应用,采用涡动力学对轴向涡流分离器机筒内液体的流动情况进行研究,分析了不同转速、分流比下机筒锥角对切向速度和分离效率的影响。分别采用非结构网格和结构网格对轴向涡流分离器物理模型进行网格划分,取模型网格数量为140万个。模拟结果表明,当机筒锥角为10°时,机筒内液体的涡流半径最小而平均切向速度最大;安装有10°锥角机筒的轴向涡流分离器最佳转毂转速范围是3 100～4 300 r/min,在此转速范围内运行时分离器分离效率可达90%以上。     

FCC装置旋风分离器改进翼阀的防磨性能流场分析

针对FCC装置旋风分离器翼阀由于漏风导致阀板冲蚀磨损的问题,设计了三种结构的翼阀,分别是:阀口加导流片(A型)、阀板外凸(B型)和阀板内凹(C型)。采用计算流体力学方法对三种结构翼阀周围的气相流场进行了数值模拟,并基于流场分布分析了催化剂颗粒对翼阀阀板的冲蚀磨损特点。计算结果表明:对于A型翼阀,导流片的导流作用可以防止气流夹带催化剂颗粒对阀板形成30°～40°冲击角;B型翼阀由于外凸阀板结构,在阀板表面形成一个气垫,会减弱催化剂颗粒对阀板的直接冲击;C型翼阀由于内凹阀板结构,阀板内表面易受气流的直接冲击,加剧了催化剂颗粒对阀板的冲蚀磨损。研究结果综合表明,A型和B型翼阀结构具有抑制颗粒冲蚀磨损的功能。     

逆流式铁粉末磁选机及其在镀锌线循环水处理中的应用

钢铁厂在钢带表面镀锌之前需要对钢带进行清洗,在冷轧过程中需要对钢带表面进行冷却。循环使用的清洗液和冷却液中含有大量的铁粉末。循环液中的铁粉末会导致镀锌缺陷和轧制缺陷。介绍了一种逆流式铁粉末磁选机,并将其用于去除循环液中含有的铁粉末。该设备在马钢股份公司1#镀锌生产线3 a的实际使用中,单循环除铁率高达98.7%,其性能完全满足钢铁厂对于除铁的要求。     

Effects of the impeller blade geometry on the performance of a turbo pneumatic separator

Abstract

This paper mainly presents an analysis of the effects of the impeller blade geometry on the performance of a turbo pneumatic separator based on the CFD simulations by using Fluent 14.5.0. The simulation results indicate that the air vortex can be eliminated by using the positive bending arc blades with a remarkably small impacting angle. Furthermore, the optimum installation angle range for the positive bending arc blades was studied. The material classification experiment results show that for the positive bending arc blades with the optimum installation angles, the fishhook depth is decreased, the classification accuracy is increased, and the particle size distribution of fine powders is narrowed, especially under the design condition, compared to the straight blades. This suggestion of impeller blade geometry for the turbo pneumatic separator is the important basis for designing this type of separators and improving its classification performances.     

风力干法分离细粒煤粉的研究

动力煤选煤厂细煤泥一般不分选,细煤泥经过压滤脱水后煤泥产品水分高,煤泥综合利用难度大,市场竞争力不强。为了降低煤泥水分,提高发热量,减小煤泥水系统负荷,提出风力干法分离细粒煤粉,干燥粉煤回掺以降低煤泥水分的方法。从理论上介绍风力干法分离的基本原理和可行性,给出基本流程,结合流程分析部分细颗粒不进入主选系统的优点。对分离室内处于理想状态下的单个细颗粒煤粉进行受力分析,计算分离室内主要的分离参数。初步效益估算表明：风力干法分离细粒煤粉具有很高的社会效益和经济价值,前景广泛,值得进一步研究推广。