共查询到19条相似文献,搜索用时 93 毫秒
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对41%草甘膦异丙胺盐水剂各项技术性能指标、理化性质和药效进行试验,从而选取最优助剂,筛选出最佳配方。 相似文献
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草甘膦生产过程中三乙胺回收系统的工艺改进 总被引:1,自引:0,他引:1
本文介绍了从草甘膦结晶母液中回收三乙胺的工艺改进。采用中和后静置分层的工艺取代了原有的间歇精馏回收工艺,新工艺的特点是回收率高,操作简便,节能显著,适全大规模生产的需求。 相似文献
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在流化状态下种子(大豆)与硅胶能够很好的混合,通过湿含量梯度进行传质,干燥后种子质量显著提高;种子与硅胶粒径不同,便于分离。通过实验比较了在不同混合比和不同流化条件下种子的干燥特性。随着吸附剂的加入,干燥速率明显增大,并且随着风速的提高、硅胶与种子混合比的增大,干燥速率也随之提高。通过试验还表明,采取流化床与固定床动静结合的吸附干燥方式,在节能和产品质量方面有一定的优势。 相似文献
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介绍了大型草甘膦溶剂回收装置的技术改进,改进型组合塔板和DCS的成功运用,使装置具有回收效率高、节能显著及操作简便等优点。 相似文献
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为了提高干燥系统的热效率,降低干燥工序的能耗,从干燥过程的各个工序剖析,分析减少干燥过程的热量、加强热量的回收利用等节能技术,同时,对未来干燥器的节能举措提出建议,为提高干燥系统地热效率提供参考。 相似文献
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分析了氯化钙的干燥特性,进行了干燥方式的选型。对氯化钙流化床干燥系统进行了设计计算,在设计中采用了部分气体循环等有针对性的技术。运行结果表明干燥方法合理先进、设计可靠、经济效益显著。 相似文献
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对离子交换树脂的两种流化床干燥工艺作了简单介绍,重点介绍了一种利用流化床连续干燥系统对离子交换树脂进行干燥冷却的工艺。此工艺针对离子交换树脂的特点进行设计。试验证明该工艺具有投资少和节能高效的特点,有很好的推广前景。 相似文献
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设计了太阳能流化床干燥的试验装置,通过试验的方法研究了流化干燥特性和太阳能利用的效益。对冷热态,不同流量,不同物料层高等参数变化,进行了测试,对比进行了多次试验,得到了不同参数的试验结果。分析总结了各参数对物料干燥的影响,表明空气流量,料层高度和冷热态均会影响物料干燥程度,且热管传递的热量只有部分传递给了物料。应用Fluent商用计算软件,对热管换热开展了数值模拟,获得了换热效率的变化,研究结果说明数值计算与试验结果符合较好。 相似文献
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The presented study describes the processes and mechanisms of batch fluidized bed drying. The influencing factors of hot air drying are theoretically and experimentally examined, in order to present the relations between temperature and humidity profiles and all other drying parameters. A physical model is presented to facilitate the calculation of the drying processes under defined conditions. Three succeeding drying stages are therefore modeled. Mass and energy balances including all components taking part in the process are formulated. The model clarities the drying process under the assumption of pure heat transfer mechanisms. It does not contain adaptive parameters and takes into account an inactive bypass fraction of the fluidization and drying medium. The evaluation of the model was successful for two fluidized bed plants with nominal widths of 100 mm and 400 mm. The experiments showed sufficient accuracy and transferability of the model to equipment of application‐oriented dimensions. 相似文献
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脲醛树脂乳液干燥成粉末的试验研究 总被引:2,自引:0,他引:2
进行了用惰性粒子流化床干燥器将脲醛树脂乳液干燥成粉末的试验研究,产出了品质好的干粉,得出了在试验条件下的干燥强度和热效率,并作了经济性评价。 相似文献
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Varsha S. Joshi 《Drying Technology》2013,31(7):749-757
Saccharomyces boulardii yeast is considered as a probiotic according to the World Health Organization (WHO). Like any other probiotic, Saccharomyces boulardii is available as a freeze-dried formulation. Although freeze drying is the most preferred method of preserving the microorganisms, the process is very expensive. The cost of capsules containing freeze-dried probiotic yeast is certainly out of reach of the underprivileged population of the world. Hence, the present work focuses on developing a new formulation and cost-effective drying process for probiotic yeast. Freeze drying was compared with fluidized bed drying (FBD) and heat pump–assisted fluidized bed drying (HP-FBD) techniques for drying of Saccharomyces boulardii formulation. The process involves addition of lactose and microcrystalline cellulose to the biomass obtained by centrifugation and then making the dough. This blend is then extruded and spheronized to form granules. Heat pump fluidized bed drying of the formulation resulted in higher activity retention compared to atmospheric fluid bed drying. This encouraged further experimentation using HP-FBD to study the effect of various operating variables such as air temperature, air humidity, and velocity on the drying kinetics and the deactivation kinetics. It was observed that the temperature and humidity play a major role in the deactivation and drying, whereas the change in air velocity has comparatively less effect on both parameters. The effective diffusivity and the deactivation rate constants were correlated to the temperature using an Arrhenius-type equation. 相似文献