简述喷雾干燥的条件。
①气体加热;空气预先通过许多环饶的蒸汽管使空气温度达到175℃,或通过喷气加热的管壁达到大约260℃。②雾滴的快干燥:首先将液体加热到合适的温度,然后通过雾化器等对其进行雾化。热空气与雾化液体混合,而后发生干燥。
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