回流比,reflux ratio
1)reflux ratio回流比
1.Assurance of the bestreflux ratio of sludge in improvement on DAT-IAT for municipal wastewater treatment;改进型DAT-IAT工艺处理城市污水污泥最佳回流比的确定
2.Dynamic analysis ofreflux ratio in the batch still process;间歇蒸馏最佳回流比的动态分析
3.Determination of optimumreflux ratio of distillation column using PRO/Ⅱand Excel;利用PRO/Ⅱ和Excel求解精馏塔最优回流比
英文短句/例句
1.EFFECT OF INNER CIRCUMFLUENCE RATE ON THE PERFORMANCE OF CONTINUOUS-FLOW IMPROVED A~2/O REACTOR内回流比对连续流改进A~2/O反应器性能的影响
2.Gilliland correlatio吉利兰特公式(理论塔板与回流比关系式)
3.Returned Ratio of Anoxic/Oxic Process for Treating Chemical Mixed Wastewater Treatment回流比对A/O工艺处理混合化工废水的影响
4.Impact of Reflux Ratio on the Denitrification Performance of Pre-denitrification Biological Aerated Filter回流比对前置反硝化BAF工艺脱氮效能的影响
5.Influence of Mixed-liquor Return Ratio and Sludge Return Ratio on Anoxic Phosphorus Uptake of MUCT Process混合液及污泥回流比对MUCT工艺缺氧吸磷的影响
6.Influence of Reflux Ratio on TN Removal Efficiency in Suspended Carriers Fluidized Bed硝化液回流比对悬浮载体流化床TN去除效能的影响
7.Effect of different recirculation ratios on removal efficiency of nitrogen in unplanted vertical flow constructed wetlands不同回流比对无植物垂直流人工湿地除氮效果的影响
8.The effect of reflux temperature, reflux ratio and reaction pressure on the oxidation process was simulated.用此模型考察了反应压力、冷凝回流温度和回流比对反应过程的影响。
9.Returns the internal rate of return for a series of cash flows.返回一系列现金流的内部返还比率。
10.COLORIMETRIC DETERMINATION OF GERMANIUM IN GARLIC BY ACID DIGESTION UNDER REFLUX AND EXTRACTION回流装置酸消化萃取比色法测定大蒜中锗
11.Umpire system of canoe slalom wildwater games over PC control;基于PC控制的皮划艇激流回旋比赛判罚系统
parative study on the curative effects of two methods of refluence clysis in children with congenital megacolon disease两种回流灌肠法治疗先天性巨结肠的对比研究
13.Incidence of pancreatic cancer in Shanghai:a current,retrospective and comparative exploration上海市胰腺癌流行现况、回顾与比较分析
14.Simulation of Reverse Flow in Low Specific Speed Double Suction Centrifugal Pump低比转数双吸离心泵回流问题的CFD研究
15.Figure 5. Transfer efficiency of a solder paste related to aperture area ratio and its effect on reflowed bump co-planarity.图5,锡高转移的效率与孔面积比率及它对回流峰共面度的影响。
16.Conclusion: The refluxing method is better than the soaking method in determing the content of the polysaccharide.结论采用回流提取法比模拟泡茶的方法提取的多糖要高。
parison of Clinical Efficacy of Ileal Orthotopic Neobladder Versus Modified Mainz Pouch Ⅱ;回肠代膀胱术与改良MainzⅡ式可控尿流改道术临床疗效比较
18.Two multiplicator effect s comparison: public investment and farm worker s starting up;两种乘数效应之比较:公共型投资与民工回流创业
相关短句/例句
recirculation ratio回流比
1.Effect of differentrecirculation ratios on removal efficiency of nitrogen in unplanted vertical flow constructed wetlands不同回流比对无植物垂直流人工湿地除氮效果的影响
2.The results showed that when HRT(Hydraulic Retention Time) ranged from 2 to 24 h withrecirculation ratio of 1∶1,average ρ___(COD) was 78 mg/L,ρ_(SS),18 mg/L,color,16,turbidity 18 in the effluent of the EGSB reactor,meeting the discharge requirements of The Second Grade of Discharge Standards for Municipal Wastewater Treatment Plant.实验结果表明:在回流比为1∶1,水力停留时间(HRT)为2~24 h范围内,城市污水经EGSB处理后,其出水平均ρCOD为78 mg。
3.Hydraulic loading andrecirculation ratio hav.上升流速和回流比对EGSB反应器运行效果影响较大 ,高上升流速和回流比运行条件下有利于发挥反应器的运行潜
3)constant reflux ratio恒回流比
1.Limiting concentration of light component in distillate of binary batch distillation underconstant reflux ratio;恒回流比二元间歇精馏轻组分的极限浓度
2.Calculation of batch distillation of multi-components underconstant reflux ratio;恒回流比多组分间歇精馏计算
3.It is derived that the varying manner of instantaneous constant composition region with batch distillation of a binary ideal mixture underconstant reflux ratio and ideal operating condition is determined with the numeric of f(x_F)[Eq.完善了采用恒回流比操作方法 ,在理想操作条件下间歇精馏二元理想混合物时 ,最小回流比的计算方法 。
4)Returned sludge ratio外回流比
5)low reflux ratio低回流比
6)high reflex ratio高回流比
延伸阅读
回流比精馏操作中,由精馏塔塔顶返回塔内的回流液流量L与塔顶产品流量D的比值,即R=L/D。回流比的大小,对精馏过程的分离效果和经济性有着重要的影响。因此,在精馏设计时,回流比是一个需认真选定的参数。从双组分精馏的图解法计算(见精馏)可知:增大回流比可减少分离所需的理论板数。但回流比的增大,必要求塔釜产生的蒸气量相应增加。回流比增大的上限是全回流即进入冷凝器的蒸气在冷凝后全部返回塔中。在全回流条件下,分离所需的理论板数最少。当回流比减小至某一数值时,理论上为达到指定分离要求所需板数趋于无穷大,这是回流比的下限,称为最小回流比Rmin。当操作回流比下降到小于最小回流比时,就不能达到规定的分离要求。最小回流比不仅取决于分离要求,还与料液的相对挥发度和料液组成以及进料的热状态有关。对于相对挥发度在全塔接近常数的料液的分离,最小回流比Rmin可由下列两式(常称安德伍德方程)算出: (1)(2)式中 αi为组分i对某一基准组分的相对挥发度;x 为料液中组分i的摩尔分率;为组分i在塔顶产品中的摩尔分率;q为进料的热状态参数(进料变为饱和蒸气所耗热量与它的汽化热之比。显然,进料为饱和液体时q=1,为饱和蒸气时q=0),m为料液所含组分数,θ为由式(1)确定的参变数,其值介于两个关键组分的相对挥发度之间。所谓关键组分是料液中对分离起关键作用的两个组分,也即生产要求把料液在此两组分间分割开来。对于双组分物料,关键组分就是此两组分。由式(1)求出 θ值以后,代入式(2)即可算出最小回流比Rm。回流比R与分离所需理论板数 NT的关系(见图)表明:回流比从最小值逐渐增大的过程中,所需理论板数起初急剧减少,设备费用亦明显下降,足以补偿能耗费用的增加;但当回流比继续增大时,所需理论板数减少趋势缓慢 (其极限值是全回流所需要的最少理论板数Nm),此时设备费用的减少将不能补偿能耗费用的增加。回流比的选择是一个经济问题,是在操作费(主要取决于能耗)和设备费(塔板数以及再沸器和冷凝器的传热面积)之间作出权衡。实际使用的回流比通常为最小回流比的1.1~2.0倍。操作中精馏塔的分离能力,主要取决于回流比的大小。增大回流比,就可提高产品纯度,但也增加了能耗。改变回流比,是调节精馏塔操作的方便而有效的手段。