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中浓条件下纸浆与气态漂白剂的混合 总被引:1,自引:1,他引:0
中浓漂白是很有发展前途的漂白技术, 中浓浆泵和中浓混合器是实现中浓漂白的关键设备, 直接关系着漂白剂(无论气态还是液态) 与纸浆的混合质量。该文着重探讨了中浓纸浆与气态漂白剂的混合机理, 介绍了中浓混合器的基本结构。 相似文献
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通过对微混合器的通道结构进行优化或设计新型的通道,改变流体的运动状态,实现流体之间的快速混合和提高混合效率是当今微混合器研究的重点。为了进一步提高微混合器的混合效率,课题组设计了一种带有凹凸腔的方波型微混合器。在不同的Re下,对设计的微混合器进行数值模拟,以混合强度和压降作为评价指标,得到了凹凸腔方波型微混合器的最优结构参数。研究结果表明:凹凸腔微混合器的混合强度和压降都高于方波型微混合器,在Re=10时混合强度提升最显著。对2种结构进行流场分析,发现流体流经凹凸腔结构时能够产生涡流,层流状态被打破,流体之间的接触面积增大,混合强度得到提高。 相似文献
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1引言高、中浓浆泵,在国外的制浆造纸业已得到广泛应用。高、中浓浆泵,用于高、中浓制浆、漂白,具有简化工艺,减少环境污染,高效、节能等特点。80年代,随着改革开放的深入,我国的造纸业引进了大量国外先进的造纸设备和造纸技术,高、中浓制浆工艺也被引进使用。作为高、中浓制浆的关键设备,高、中浓浆泵,被我国的科技界和大专院校所重视,开始研究开发。大连轻工学院研究成功的高浓泵是由转子和星轮组成,浆料在转子的螺旋槽内靠星轮叶片的推挤和刮削来实现压缩和输送。输送浓度约为ZO%。该结构加工工艺复杂,造价高,效率低,实… 相似文献
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在纸浆多段漂白过程中,氯化是关键的阶段,而搞好氯化段的关键是如何使浆料与氯气迅速而均匀的混合,这就要求有能供浆料和氯气混合之设备——浆氯混合器。传统使用的浆氯混合器及其相应组合的典型流程有喷射式浆氯混合器典型流程(图一)、涡轮搅拌式浆氯混合器典型流程(图二)、单辊混合机典型流程(图三)、浆氯混合泵典型流程(图四)、以及管道插入法浆氯混合典型流程(图五)等几种,但所有这些都存在着某些不足,如图一流程的喷射式浆氯混合器因是利用高压加速的浆流从中间喷嘴处射出,将能量传递给喷嘴外的低压氯气流, 相似文献
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以SULZER公司制造的MCE中浓浆泵、中浓混合器、中浓浆料分流排料器为例,介绍了中浓纸浆输送系统的设备原理、特点及应用等. 相似文献
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T. A. Mitchell 《Journal of the science of food and agriculture》1971,22(12):626-631
A laboratory dough mixer and its electrical and pneumatic control circuits are described. The mixer accurately measures dough ingredients (except flour) and adds them to the mixing chamber during the mixing cycle. It also titrates sufficient water into doughs to bring them to standard consistency. The addition of flours (50 g) and removal of doughs is done manually. One person can readily operate a battery of six mixers producing 60 doughs an hour. 相似文献
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G. Schütz 《Starch - St?rke》1974,26(9):312-314
Static Mixing. A New Mixing Method. As an introduction, the term of static mixing as well as differences between static and dynamic mixing are explained. Construction and function of a typical static mixer, the Sulzer-mixer, are illustrated. This is especially elucidated by means of sectional view pictures which were taken during the mixing process. Examples are given for the numerous possibilities of application with brief mentioning of their respective limits. 相似文献
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目的:分析双轴桨叶式混合机内食品粉体颗粒的运动混合特性,优化验证混合机结构。方法:采用EDEM软件对3种不同尺寸的食品粉体颗粒按比例混合进行仿真,以后处理Bin Groups建立混合箱观察混合情况,并通过研究不同类型食品粉体之间的颗粒数量来进行评估。结果:在t=5 s时,3种粉体食品颗粒所对应的方格中颗粒数量还存在一定的差距,但是基本相差不大,3种粉体食品颗粒的混合程度已经很高;3种粉体食品颗粒之间的接触随时间的变化趋势大体上是相同的,随着时间的增加,各种粉体食品之间的接触数量也随之增加,待t=8 s之后,各种粉体食品颗粒之间的接触数量基本达到稳定值。结论:采用离散元法可以有效分析桨叶式混合机中粉体食品的混合情况。 相似文献
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The Matching Stress Method is a mixer viscometry technique used to estimate mixer constants and viscosity using systems of complex geometry. Three Newtonian standards and three hydroxy‐propyl‐methyl‐cellulose (HPMC) solutions were used as model systems. to determine the mixer constants, a counter‐rotating, twin‐rotor blender was modified with a torque transducer and speed sensor installed between a drive shaft and a 0.75 hp (559.3 W) electrical motor. Mixer constants were determined using a concentric cylinder approximation of shear stress in an effort to match this approximation with shear stress measurements determined from a bench top rheometer. Mixer constants for the model systems ranged between 2.01 and 2.87 rad?1 with an average value of 2.57 rad?1 for all fluids. the results demonstrate a successful technique for providing accurate viscometric data during mixing processes. Such efforts could be followed to implement real time, quality control strategies and power estimation in scale‐up procedures. 相似文献