在不锈钢换热器的循环干燥过程中,高温空气已经到或挨近饱满状态,此刻高温高湿空气无法带走物猜中的水分,物猜中的水分因为外界湿度到饱满而中止蒸腾。此刻,高温高湿的空气不利于物料的连续干燥。
不锈钢换热器在干燥过程中消耗很多热能。为了节约能源,一些含水量高的物料和含有固体物质的悬浮液或溶液,一般是机械脱水或加热蒸腾。短时间内,简单造成外界热空气饱满。新鲜空气用于干燥,即空气经设备加热后,热空气的流向与物料的流速逆流。另一种状况是热风循环干燥,因为物料含水量不高,不简单在短时间内使热风饱满,干燥需求坚持蒸腾温度条件。此刻大多排除部分湿热空气,节约能耗,节约生产成本。
当冷热流体中的一种或两种发生相变时,因为相变过程中只释放或吸收汽化潜热,流体本身的温度不变,所以流体的进口和出口温度相等,那么两种流体的温差与流体流向的选择无关。除了顺流和逆流两种流向外,还有横流和折流两种流向。
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