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对传统的重力沉降式绿液澄清器与绿液X-过滤器的主要技术参数、工作原理、操作性能进行分析比较。并对绿液X-过滤器的应用进行了展望。 相似文献
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压力管道设计中,管径和壁厚的合理取值尤为关键,它牵涉到整个设计过程的始末.因此,设计过程中如何选择合理的管径和壁厚,就显得非常必要.文章介绍了压力管道中管径和壁厚选择的基本方法;设计时可按预先选取的介质流速计算出最小管径,然后壁厚可近似按薄壁圆筒公式计算,向上圆整到标准规格即可.此方法即方便又简捷,可节省大量不必要的工作. 相似文献
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为探索胆固醇类液晶在热致变色纺织品制备中的应用,采用三羟甲基三聚氰胺为壁材,胆固醇油醇碳酸酯和胆固醇壬酸酯的混合物为芯材,利用原位聚合法制备了胆固醇液晶微胶囊。对制备得到液晶微胶囊的微观形貌特征、热学性能以及热致变色性能进行了测试。测试结果表明:在乳化速度为6 000r/min、芯壁质量比为3:2、微胶囊包覆时反应溶液pH值为4.0的条件下,制备的液晶微胶囊粒径分布在10μm左右,微胶囊具有致密的壳结构、表面光滑的球形形态,以及良好的热致变色性能;它可在34.4 ~38.0 ℃的温度区间内,依次显示红黄绿蓝紫的颜色变化;其变色温度与人体体温接近,适合用于热致变色织物的制备。 相似文献
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Oil mixtures of medium-chain triglycerides (MCT) and D-limonene in mixing ratios from 10 to 100 wt% were encapsulated in modified starch (wall material) by spray drying to produce oil-rich powders. The oil load (mass ratio of oil mixture to wall material) of the infeed emulsion markedly influenced the properties of the infeed liquid and the characteristics of the resulting powder. The viscosity of the infeed liquid and the particle size of the powder exponentially decreased with increasing oil load, while the emulsion droplet size in the infeed liquid increased. In addition, retention of D-limonene during spray drying also decreased markedly with increasing oil load. Irrespective of the different oil loads and concentrations of the wall material, D-limonene retention was well correlated with the emulsion droplet diameter of the infeed liquid. The encapsulation efficiency of the oil mixture exhibited a maximum value (almost 100%) at an oil load between 0.5 and 1.0, before decreasing at higher oil loads. At an oil load of 2.0, the encapsulation efficiency of D-limonene was reduced to almost zero, while around 40% of the initial MCT was encapsulated in the powder. The increase in oil load also led to increased amounts of surface oil of MCT and D-limonene in the resulting powder due to the increasing emulsion droplet diameter of the infeed liquids. PRACTICAL APPLICATION: This study proposes the microencapsulation of medium-chain triglycerides under high-oil-load conditions by spray drying. The powders prepared by this process provide significant benefits in terms of rapid energy conversion after consumption without accumulation in the body. Important quality factors of the powder products such as the encapsulation efficiency and the amount of surface oil were examined to understand the optimum process conditions for spray drying. 相似文献
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输卤管在运行过程中,在一定的物理化学条件下,输卤管脱落物、卤水中悬浮物的沉降、卤水中化学物质的析出造成管壁结垢或异物进入管道在一些地方淤积等造成管道有效通径缩小,从而使管道输送能力下降,输送成本提高,影响企业效益。对结垢或堵塞管道实施清洗是提高其输送能力,进而提高企业效益的重要举措。 相似文献
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针对电致变色液晶易流动,难以塑形而不易与纺织品结合应用的问题,在向列相液晶中掺杂二色性染料形成宾主材料,采用乳液聚合方法将其作为芯材封装在以聚甲基丙烯酸甲酯为壁材的微胶囊内,得到染料掺杂型液晶微胶囊。通过偏光显微镜分析液晶在限域条件下的独特光学性质,借助扫描电子显微镜、透射电子显微镜、热重分析仪等表征微胶囊的形貌结构及热学性能,并探讨微胶囊包覆对染料掺杂型液晶的驱动电压与使用寿命的影响。结果表明:制备的染料掺杂型液晶微胶囊具有明显的核壳结构,粒径为3 μm,芯材载量约为70%,驱动电压为3.6 V,远低于人体安全电压;以微胶囊为原料涂敷在导电织物上,其光学外观可在直流电源刺激下于无色态和有色态之间发生可逆转变,从而为优化电致变色液晶微胶囊器件制备工艺和提高纺织品柔性显示性能奠定基础。 相似文献
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中国草类纤维制浆的理论与技术研究 总被引:5,自引:1,他引:5
总结了我国多年来研究草类纤维制浆造纸所得到的规律。根据草类纤维原料结构和化学组成的不均匀性和纤维形态分布,论述了强化禾草类秸秆的除尘备料过程,是获得浆料滤水性能好、黑液黏度低的关键。论述了草类纤维制浆与木材的差异,分析了造成差异的内在因素,指出草类原料制浆没有必要采用过高的温度和较长的保温时间。草类纤维制浆的最佳工艺应该是在蒸煮过程中除去85%左右的木素,然后氧脱木素制浆。分析了草类原料制浆污染治理困难的原因,指出草浆黑液的化学组成与物化性能的关系、碳水化合物含量高是造成草浆黑液黏度高的重要内在因素。介绍了当前解决这些问题的一些研究成果。 相似文献
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