共查询到18条相似文献,搜索用时 218 毫秒
1.
多塔变压吸附制氧技术实验 总被引:1,自引:0,他引:1
以微型四塔变压吸附制氧系统为研究对象,实验研究了原料气量、产品气量、节流孔径、分子筛量及吸附器高径比等工艺参数对产品气中氧气体积分数和氧气回收率的影响.实验结果表明,随着原料气进气流量的增加,产品气中氧气体积分数增加而氧气回收率降低;随着产品气流量的增加,产品气中氧气体积分数下降,而氧气回收率升高;随着节流孔径的增大,产品气中氧气体积分数先增大后减小,合适的节流孔径为0.75 mm左右;随着分子筛量的增加,产品气中氧气体积分数先增大后减小;产品气中氧气体积分数随高径比的增加先增大后减小,合适的吸附塔高径比为5.3左右,其值需实验确定. 相似文献
2.
变压吸附浓缩低甲烷浓度煤层气的实验研究 总被引:2,自引:0,他引:2
通过两塔真空变压吸附装置,对低甲烷浓度的煤层气进行了浓缩实验。实验中研究了两种活性炭、三种不同的流程以及均压时间和节流孔径等操作参数对解吸气甲烷浓度和甲烷回收率的影响。结果表明,比表面积和分离因子都较大的活性炭更适合用作浓缩煤层气的吸附剂;上下不同步均压流程比其他两种流程有更好的浓缩效果且上、下均压时间都存在着最佳值;节流孔径对甲烷回收率影响较大,为同时保证解吸气甲烷浓度和甲烷回收率,需要选择合适的节流孔径。这些研究结果可为变压吸附浓缩低浓度煤层气的深入研究和工程应用提供参考。 相似文献
3.
4.
5.
介绍了单吸附床真空变压吸附(RVPSA)制氧的原理和流程,通过实验研究了微型RVPSA制氧过程中吸附时间、抽真空时间、吸附床长度、反吹阻力、分子筛颗粒直径和产品气流量对产品气浓度的影响规律。实验结果表明:随着吸附时间和抽真空时间的分别增加,产品气纯度先升高后下降,存在一个最佳的吸附时间和抽真空时间;产品气纯度随着吸附床长度的增加而上升;随着反吹阻力的增大,产品气纯度升高到一个峰值后开始下降;对于不同的实验祭件,都有一个最佳的吸附剂颗粒尺寸。 相似文献
6.
7.
低浓度CO2是温室气体的主要来源,探讨了用真空变压吸附法对低浓度二氧化碳气体进行分离的实验研究,主要研究了顺向、逆向均压时间对分离效果的影响。结果表明运用均压流程可以同时增加产品气浓度和产品气量;在相同的条件下,产品气浓度随均压时间先增大后减小;逆向均压可以得到更高纯度的产品气。 相似文献
8.
9.
10.
建立了变压吸附空分制氧过程非线性、非等温模型,并进行了数值模拟,计算结果与实测值吻合较好.在此基础上探讨了变压吸附过程中床层内温度和体积分数的动态行为,考察了吸附时间、吸附床高度、进气流速、清洗比等工艺参数对过程性能的影响.结果显示,对于本研究中的小型变压吸附装置,吸附热对产品气的影响不太大. 相似文献
11.
通过研究焰熔法生长钛酸锶单晶体过程中生长室内的温度分布特征,分析了H_2和O_2流量、喷嘴孔径对温度分布的影响。结果表明,采用焰熔法生长SrTiO_3晶体时,晶体熔帽表面温度和压力由中心逐渐向外降低;随着H_2流量的增加,中心轴向的最高温度的位置基本不变,晶体熔帽温度和晶体四周的最高温度逐渐升高,只是升高幅度有所减小;晶体熔帽温度、压力及晶体周围烟气温度随O_2流量增大而升高,而轴向最高温度则降低;增加喷嘴的中心孔径将使轴向最高温度、晶体熔帽温度和径向温度梯度降低,而喷嘴的H_2孔径对生长室内轴向和径向温度分布的影响不是很明显。 相似文献
12.
生长工艺对生长室内温度分布影响的数值模拟 总被引:1,自引:0,他引:1
为给实验研究晶体生长工艺提供必要的理论指导,以氢气和氧气的燃烧为基础,研究了焰熔法生长金红石单晶体过程中生长室内的温度分布特征,分析了H_2和O_2流量、喷嘴尺寸对温度分布的影响.研究表明:适合金红石单晶体生长的最佳燃烧器为内O_2、中H_2和外O_2的三管结构;随着H_2流量增加,生长室轴心线上和径向温度逐渐增大,H_2流量增加2 L/min,中心最高温度平均升高160℃,位置向下移动约2.5 mm;随着内、外O_2流量增加,生长室轴心线上和径向温度逐渐降低,与内O_2的影响相比,外O_2对中心温度影响较小,而对径向温度的影响较大;随着内O_2喷嘴孔径的增加,生长室轴心线上最高温度逐渐增大,而位置逐渐向喷嘴方向移动,而外O_2和H_2喷嘴孔径对轴心线上最高温度的影响非常小. 相似文献
13.
The influences of inlet gas flow rate and reactor configuration on volatile organic compounds (VOCs) decomposition efficiency in a traditional gliding arc (T-GA) facility are studied based on laboratory experiments and numerical simulation. The ratio of the nozzle diameter and the shortest distance of two electrodes should be maintained in a suitable value range to guarantee the decomposition efficiency, which indicates simply enlarging the nozzle inner diameter is not a proper way to raise the T-GA treatment capacity in a fixed supply voltage condition. A developed gliding arc gas discharge (D-GA) reactor based on a modified gas feed system is proposed: small flow rate air goes through the bottom nozzle to process the GA evolution, and high flow rate contaminated gas goes frontal through the plasma region and decomposes. The performances of D-GA reactor in the decomposition of VOCs with relative high gas flow rate, including decomposition efficiency and specific energy consumption, are better than T-GA reactor. D-GA reactor also avoids the drawbacks of the increases of power system amount and electric power consumption in multi-electrode GA system. 相似文献
14.
15.
喷射硝化法是目前最常用制备硝化甘油的硝化方法,但实际应用中常会出现批次与批次之间喷射效果差别太大、雾化效果不均匀等情况,对硝化甘油的制备产生了一定程度的影响。为了分析不同结构参数对喷射器喷射效果的影响,进而优化喷射器的结构,本文使用相位多普勒技术(PDA)的检测方法,检测了不同喷嘴安装形式、不同加工精度、不同流体喷嘴的轴向位置等不同结构参数下喷雾颗粒的粒径及速度分布。通过试验,得出了不同结构参数下雾化颗粒粒径、颗粒速度的轴向及径向分布规律,并得出了最优喷射器喷嘴结构,使雾化后颗粒的粒径降低至40μm以下,颗粒速度降低至3 m/s,对工厂的实际生产有一定的指导作用。 相似文献
16.
The selection and adjustment of an effective abrasive mass flow rate is one of the most important requirements for efficient blast-cleaning processes. Steel grit is one of the most widely used abrasive materials in the industry, and the adjustment of effective steel grit mass flow rates can improve efficiency and decrease costs. Systematic investigations into the metering behavior of steel grit have not been performed yet. The paper deals with a systematic investigation into the flow of high-carbon cast-steel grit particles through a metering valve. The investigation involves abrasive mass flow rate measurements, and the results are statistically interpreted based on design of experiments and analysis of variance. Four process parameters are varied, namely static air pressure, nozzle diameter, valve opening, and particle size range. Abrasive mass flow rate increases if air pressure, nozzle diameter, or valve opening increases, and it decreases if particle size becomes smaller. Only valve opening and nozzle diameter provide statistically significant effects. Interaction effects are statistically insignificant for all parameter combinations. It is concluded that a three-parameter linear regression model is suitable to statistically describe the relationships in the scope of the evaluation effort. 相似文献
17.
W.S. Prashanth Sabin Lal Thotarath Supriya Sarkar T.N.C. Anand Shamit Bakshi 《Advanced Powder Technology》2021,32(3):693-701
Metal powders are often made by gas atomization of liquid metal. During the process, liquid metal which flows from a melt delivery tube (MDT) is atomized by high speed gas discharging from a gas nozzle. In this work, the effect of the melt delivery tube position on atomization outcomes such as the yield, mass median diameter, and spread of the particle size distribution, is studied experimentally. A melt atomization setup (pilot-scale) is used to produce tin powder by gas-atomization. Three MDT positions, namely, intruded, extruded and flush with respect to the gas nozzle, are chosen for this study. Three pressure regimes (atmospheric, aspiration and pressurization) are established by varying the relative distance between the MDT and the gas nozzle exit for the three positions. Experimental investigations revealed that the intruded position produces powder with lower mean particle sizes and lower spread than the extruded configuration. The intruded position also gives a significantly higher yield compared to the extruded and flush positions at low gas flow rates, and hence appears to be the most suited for metal atomization using a free-fall configuration. 相似文献