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本文描述了一种冷冻干燥牧草的大型密闭系统。该系统利用吸收干燥的原理、依靠牧草与硅胶干燥剂之间的蒸汽压差进行干燥。在一个温度约为-10℃的系统中,把其样品中的冰升华为蒸汽、在鼓风机鼓动的循环气流中蒸汽被硅胶吸收,鲜牧草样品(每样即至50公斤)与硅胶重量相等。这种系统结构简单,成本较低。使牧草中的水分含量从90％降低到10％约需8天。用这种系统,对取样于不同成熟期的24个不同的温带和热带禾本科、豆科植物种或品种进行了干燥试验。用此法冷冻干燥的快速冷冻牧草,可使在收割及进行评价准备时牧草所发生的物理和化学变化减少,能为进行动物饲养研究和化学分析提供充足的原料。
This article describes a large closed system of freeze-dried pasture. The system uses the principle of absorption and drying, relying on the pressure difference between the grass and silica gel desiccant drying. In a system at a temperature of about -10 ° C, the ice in its sample was sublimated into steam, which was absorbed by the silica gel in a blower-agitated recycle stream. Fresh grass samples (up to 50 kg each) equal the weight of the silica gel. This system is simple in structure and low in cost. Reducing the moisture content of pasture from 90% to 10% takes about 8 days. Using this system, drying tests were conducted on 24 different temperate and tropical species, leguminous species or varieties sampled at different maturities. Freeze-dried, quick-frozen forages with this method can reduce the physical and chemical changes of pasture when harvesting and preparing for evaluation, and provide adequate raw materials for animal feeding research and chemical analysis.