共查询到19条相似文献，搜索用时 218 毫秒
1.
李其京 《荆门职业技术学院学报》2008,23(3):11-16
开发了一种水合物法分离甲烷-乙烯混合气体的新技术,利用选择性热力学促进剂THF对C1、C2气体的选择性增溶作用来提高它们的水合分离效率,并系统地测定了(CH4 C2H4 THF H2O)体系气-水合物相平衡实验数据,考察了温度、初始压力、初始气液比对(CH4 C2H4)气体混合物分离效果的影响。 相似文献
2.
水合物法分离H2+C2H4气体混合物相平衡实验研究 总被引：1，自引：0，他引：1
李其京 《荆门职业技术学院学报》2007,22(9):6-8
采用水合物吸收法,以THF为吸收剂,进行了吸收法分离(H2 C2H4)气体混合物的相平衡实验研究。结果表明,采用THF做吸收剂可望获得很好的(H2 C2H4)气体混合物吸收分离效果。 相似文献
3.
《实验室研究与探索》2013,(11):197-202
在新建高压水合物浆液流动环道上开展了水+二氧化碳体系水合物堵管实验,利用先进的高压粒度仪(FBRM)设备对水合物生成及堵管过程中的粒径分布进行了实时监测和分析;首次研究了压力、流量等因素对二氧化碳水合物堵管时间的影响。实验结果表明,系统压力升高,水合物发生堵管的时间会显著缩短(压力3.8 MPa时,堵管时间1.7 h;压力2.8 MPa时,堵管时间2.4 h),越容易堵管;流量越大,水合物发生堵管的时间越长(流量754 kg/h时,堵管时间1.59 h;流量1657 kg/h时,堵管时间4.34 h),较不易堵管;并且在水合物生成及堵管过程中,由于流体中液滴/颗粒发生碰撞和聚并,导致60200μm范围的颗粒数目有显著增加。 相似文献
4.
目的:超临界航空煤油在换热过程中会出现传热恶化的现象。本文旨在研究该现象产生的原因及质量流量、壁面热流、入口温度和压力对此现象的影响。创新点:1.分析超临界航空煤油的传热恶化现象;2.揭示超临界航空煤油传热过程中传热恶化现象与质量流量、壁面热流、入口温度及压力的关系。方法:利用数值模拟的方法,模拟超临界航空煤油在管内的流动换热情况,分析其换热特性,并探讨传热恶化产生的原因及影响因素。结论:1.传热恶化是在壁面温度达到拟临界温度或流体平均温度达到临界温度时产生的;2.换热系数随质量流量的增加或壁面热流的降低而增大;3.通过提高煤油的压力可以显著降低恶化现象。 相似文献
5.
许维秀 《荆门职业技术学院学报》2008,23(3):1-6
采用恒压法、利用全透明蓝宝石釜及配套系统,考察了分解温度(245.15~271.15 K)、生成压力(5.5~7.0 MPa)、冷冻时间、搅拌对甲烷水合物分解率的影响。结果表明:甲烷水合物适宜的生成条件为3.2℃、压力6.5 MPa、静态、冷冻时间为4 h左右,甲烷水合物的适宜储运条件为常压、温度控制在-5℃左右。 相似文献
6.
在标准实验室内,利用单变量控制法研究了细水雾灭火系统,取得最优灭火效果所对应的喷头的气液工作压力参数。首先对气体压力和液体压力及其比值与细水雾雾化颗粒的平均直径D[v,0.9]的影响进行单变量研究,然后对气体压力和液体压力配比与细水雾喷头喷雾密度关系进行了探索。结果表明,合理地设置液体压力和气体压力更能体现细水雾雾化优越性,pg=1.0~3.0 MPa,pg/pl=2时的D[v,0.9]最小;根据条件及时调整气液压力比能增大细水雾喷头的喷雾密度,从而提高两相流细水雾喷头的喷雾效果,气液压力比为2对应的喷雾效果最佳。 相似文献
7.
超临界CO2流体夹带丙酮萃取甜瓜籽油的研究 总被引：1，自引：0，他引：1
提出了超临界CO2夹带丙酮萃取甜瓜籽油的方法,研究了不同萃取压力、温度、流量、萃取时间和丙酮含量对甜瓜籽油出油率的影响.对夹带剂及其加入量对萃取效果的影响进行了研究.本研究的结果为下一步综合、无毒、高效地开发利用甜瓜籽莫定了基础. 相似文献
8.
从商丘市不同环境的土壤中分离筛选到几株产脂肪酶的霉菌菌株,作者对其中的一株根霉(Rhizopus delemar)进行了液体发酵的研究,使用发酵产酶培养基组成(%):豆粉6.0,蛋白胨4.0,蔗糖1.0,K2HSO4 0.2,MgSO4·7H2O0.1,pH6.5.产酶最适温度28 ℃,接种量为1 ml,培养周期48 h,转速200 r/min. 相似文献
9.
10.
崔玉礼 《赤峰学院学报(自然科学版)》2013,(18):42-43
在精馏塔的运行过程中,温度、液位、压力、流量参数对分离起着至关重要的作用,因此,如何设计一款能够监测到这些数据的仪表是设计工作者的当务之急.本文主要采用ARM9微处理器S3C2416实现萃取精馏塔监测仪表,可以实时采集温度、压力、流量、液位数据.通过24bit的TFT液晶屏动态显示系统的运行数据和运行模型并且实现超限报警、数据存储的功能. 相似文献
11.
Removal of chromium (Ⅵ) dissolved in water by intermittent foam separation was implemented with cetyl trimethy-ammonium bromide as surfactant. The influence of various factors on removal efficiency was systematically studied. The removal efficiency has a maximum value near pH 4.0; thus, most experiments were carried out at pH 4.0. The orthogonal experiment was conducted to confirm the optimal operating parameters. The orthogonal experimental results show that when the liquid feed concentration is 10 mg/L, the pH value of feed solution is 4.00, air flow rates 0.9 L/min, surfactant dosage is 300 mg/L, the maximum removal efficiency of chromium (Ⅵ) reaches 97.80%, and condense multiple reaches 1711. The kinetic test indicates that the foam separation of chromium is a first-order process. The equivalent rate constant calculated from the slope is 0.406 4, and the equivalent rate equation is obtained. 相似文献
12.
Removal of chromium (VI) dissolved in water by intermittent foam separation was implemented with cetyl trimethy-ammonium bromide
as surfactant. The influence of various factors on removal efficiency was systematically studied. The removal efficiency has
a maximum value near pH 4.0; thus, most experiments were carried out at pH 4.0. The orthogonal experiment was conducted to
confirm the optimal operating parameters. The orthogonal experimental results show that when the liquid feed concentration
is 10 mg/L, the pH value of feed solution is 4.00, air flow rates 0.9 L/min, surfactant dosage is 300 mg/L, the maximum removal
efficiency of chromium (VI) reaches 97.80%, and condense multiple reaches 1 711. The kinetic test indicates that the foam
separation of chromium is a first-order process. The equivalent rate constant calculated from the slope is 0.406 4, and the
equivalent rate equation is obtained. 相似文献
13.
为了从制药工业得到的乙醇废液中回收无水乙醇,研究了不同浓度的醋酸钾、氯化钙、碳酸钾及醋酸钾-氯化钙混合盐与乙二醇组成的萃取体系对乙醇-水体系分离效果的影响,并考察了溶剂比以及萃取剂和乙醇流速等操作参数对乙醇-水体系精馏分离效果的影响,开发了乙醇废水精馏制备恒沸乙醇、加盐萃取精馏制备无水乙醇和萃取剂回收为一体的无水乙醇回收体系.结果表明:采用乙二醇-醋酸钾-氯化钙三元体系组成的萃取剂,当醋酸钾的浓度为0.025 g/mL,氯化钙的浓度为0.025 g/mL,溶剂比1.2,回流比1.5,乙二醇的流速1.0 mL/min,恒沸乙醇的流速1.2 mL/min时,可以从塔顶得到质量分数大于99.8%的无水乙醇.与文献[4]相比,回流比由2.0降低为1.5,从而大大降低了乙醇回收成本. 相似文献
14.
研究目的：研究新型磁性回热填料Gd2O2S对液氦温区高频脉管制冷机多级回热器损失特性的影响。
创新要点：确定了不同回热填料以及运行参数（频率、平均压力）下液氦温区多级脉管制冷机的制冷温度和各级预冷量,进一步明确了4K高频回热损失机理。
研究方法：采用理论研究与实验验证相结合的方法,基于一台两级G-M型低频脉管制冷机预冷的单极斯特林型高频脉管制冷机,研究多级回热器在高频以及4K温区下的损失特性。选取新型回热填料Gd2O2S替代部分回热填料HoCu2,比较回热器采用两种填料时在不吲运行频率及平均压力下的冷端制冷温度（图10）、各级预冷量和预冷温度（图1112）。
重要结论：采用孔隙率较小的新型磁性回热填料Gd2O2S可显著改善第一级回热器内压力波与质量流的相位关系,从而减小该级回热损失。减小平均压力可以降低制冷机无负荷制冷温度并减小第二级预冷量,但制冷工质氦的体积比热容会急剧增大,从而使低温级回热器的换热对频率非常敏感。此外,频率对高温级回热器的回热特性影响不明显。该方法可以为三级斯特林型4K多级脉管制冷机提供设计依据。 相似文献
15.
A cold-model vertical multi-tube circulating fluidized bed evaporator was designed and built to conduct a visualization study on the pressure drop of a liquid-solid two-phase flow and the corresponding particle distribution.Water and polyformaldehyde particle (POM) were used as the liquid and solid phases,respectively.The effects of operating parameters such as the amount of added particles,circulating flow rate,and particle size were systematically investigated.The results showed that the addition of the particles increased the pressure drop in the vertical tube bundle.The maximum pressure drop ratios were18.65%,21.15%,18.00%,and 21.15%within the experimental range of the amount of added particles for POM1,POM2,POM3,and POM4,respectively.The pressure drop ratio basically decreased with the increase in the circulating flow rate but fluctuated with the increase in the amount of added particles and particle size.The difference in pressure drop ratio decreased with the increase in the circulating flow rate.As the amount of added particles increased,the difference in pressure drop ratio fluctuated at low circulating flow rate but basically decreased at high circulating flow rate.The pressure drop in the vertical tube bundle accounted for about 70%of the overall pressure drop in the up-flow heating chamber and was the main component of the overall pressure within the experimental range.Three-dimensional phase diagrams were established to display the variation ranges of the pressure drop and pressure drop ratio in the vertical tube bundle corresponding to the operating parameters.The research results can provide some reference for the application of the fluidized bed heat transfer technology in the industry. 相似文献
16.
SiCN薄膜通过反应溅射法制备,并通过红外吸收谱（IR）进行表征。结果表明,薄膜中的N含量受衬底温度、N2流量、溅射功率影响。低的衬底温度会有利于N的进入,衬底温度过高,N含量将显著下降。在恰当的N2流量下才能在薄膜中获得最高的N含量。提高溅射功率可以使得薄膜中N含量升高。 相似文献
17.
应用RP-HPLC-DAD和差减光谱法检测知母药材中菝葜皂苷元的含量,探讨监控知母药材质量的可靠手段。结果表明,在甲醇流速0.7mL/min、柱温26℃、以DAD为检测器时得到较好的色谱分离效率,工作线性范围0.02～0.12 mg/mL,r=0.998 2,对药材的回收率为96.83%。 相似文献
18.
Nanosized TiO2 particles,synthesized by microemulsion-mediated method,were characterized by XRD,TEM,EDS and BET.To judge the activity of TiO2 particles,the photocatalytic destruction of phenol in areated suspension was studied.The result shows that the photocatalytic activity of lab-made nanometer anatase TiO2 is comparable to or higher than that of commercial titania perticles.The effects of smoe processing parameters such as TiO2 content,oxygen flow rate,pH value on phenol removal were also investigated.The experimental results indicate that there is an optimum value for the TiO2 content,Sufficient O2 supply is needed, but too high gas flow rate induces large bubbles that eliminate the gas residence time and the gas/liquid contact interface,The pH value of the phenol solutions has a complex effect on the photocatalytic activity of the particles. 相似文献
19.
Investigation of oil-air two-phase mass flow rate measurement using Venturi and void fraction sensor 总被引：6，自引：0，他引：6
INTRODUCTION Accurate measurement of multiphase fluids flow rates in the petroleum industry is of great importance. The most reliable measurement technique for multi-phase flow is separating the mixture and using con-ventional devices for measuring single-phase flow. However, in many cases the separation is not practical from both technical and economical points of view. An alternative solution is the multiphase flow me-tering system, usually consisting of a combination of devices for ph… 相似文献