火焰喷雾干燥

Flame Spray Drying

阐述了一种新型的喷雾干燥方法,即伴随雾化介质被点燃的喷雾干燥,称为火焰喷雾干燥,并提供了初步研究结果。火焰喷雾干燥过程中溶剂蒸发所需能量来自于燃烧喷雾介质中的易燃组分。此种方法不但可以干燥含有可燃溶剂的溶液、浆料、乳剂或糊剂,而且可以通过添加与干燥产品类型和用途相关的可燃物对非易燃物干燥。因动力源直接位于喷雾/蒸发区域中,不但可以较好地利用能源、减少载能体的消耗,而且可以减少有害气体的排放。火焰喷雾干燥过程的载能体包括多种类型可燃性液体组分,例如来自可再生能源的生物乙醇或植物油。可燃性喷雾组分浓度的选择是火焰喷雾干燥过程的基本,因此本文阐述了浓度对所得产品品质的影响。研究了两种不同热敏性的物料,即麦芽糖糊精溶液和陶瓷材料的悬浮液。研究表明,火焰喷雾干燥过程是目前干燥方法中一种有趣的替代方法,首先可用于干燥低热敏性材料,如陶瓷材料。

The authors present a description and results of preliminary studies on a novel spray drying method, i.e. spray drying with a simultaneous ignition of sprayed medium which is called Flame Spray Drying （FSD）. Energy required to evaporate a solvent in the FSD process comes from combustion of a flammable spray component. Using this method one can dry solutions, slurries, emulsions or pastes containing a flammable solvent as well as inflammable media with the addition of a flammable substance relevant for the type and purpose of the dried product. Location of power source directly in the spray/evaporation region leads to a better use of energy and to reduced consumption of energy carriers as well as to decreased emission of harmful gases to the atmosphere.The energy carriers in the process of flame spray drying can include various types of flammable liquid components, e.g. bioethanol or vegetable oils coming from renewable energy sources. Selection of concentration of the flammable spray component has a fundamental meaning for the FSD process, therefore the effect of concentration on quality of the obtained product has been described in the paper. Studies were carried out for two materials with different thermal sensitivity, i.e. for a solution of maltodextrin and a suspension of ceramic material. It was proven that the FSD process could be an interesting alternative for the currently applied methods of drying, first of all drying of materials with low thermal sensitivity, e.g. ceramic materials.