毛竹帘常压过热蒸汽干燥系统的设计与试验

Development of atmospheric-pressure superheated steam drying system for Phyllostachys heterocycla curtains

过热蒸汽干燥技术是以过热蒸汽既为干燥介质又为传热介质的干燥方法。设计了毛竹帘过热蒸汽干燥系统及其干燥工艺,充分利用其他干燥室排放的废热蒸汽,采用电加热方式,无锅炉。5 mm厚毛竹帘干燥试验表明:新鲜竹帘含水率在57%左右,传统热风干燥单室需要92 h,成本较高;过热蒸汽干燥时间较传统热风干燥减少了52%以上,最短的只需25 h,节能11.8%以上,最高的达29.4%。该方法高效、节能,具有较高的推广应用价值。

An atmospheric-pressure superheated steam drying （APSSD） system and drying schedule were developed for PhyUostachys heterocycla curtains. The kiln is heated by electric power plus the recycled exhausted steam to avoid the use of boiler. Experiments on 5-mm-thick Phyllostachys heterocycla curtains showed that the drying time was 92 h in conventional hot wind kiln when the initial moisture content of the samples was 57%, meaning pretty high cost. By applying APSSD, the drying time dropped by more than 52% and was only 25 h in the shortest case. That means an energy saving of 11. 8% - 29.4%. Thus, it can be concluded that the APSSD is a high efficiency and energy saving drying method with great market potential.