U型隧道式水产品烘房设计及关键技术

Design and key techniques on U-shaped tunnel-drying room for aquatic products

针对热风干燥水产品过程中常出现的表面干燥脱水过快、内部水分扩散通道易堵塞,造成产品水分不均匀度值较大,影响产品烘后品质问题,设计了专用U型隧道式水产品烘房,并对横流干燥、气流正反向切换、干燥介质温度及湿度在线控制、以及热能循环利用等关键技术进行了分析与研究。与单通道、双通道烘房相比较,U型隧道内热风温度的均匀度改善,热能利用率提高,烘干时间缩短,烘房单位容积的产量增加。草鱼干燥现场生产的实测结果表明:产品脱水一致,可节省热能约30%,并缩短了生产时间约30%。

In the process of aquatic products drying, there are problems of dewatering too fast on the surface and water spread passage blocking, which cause high moisture unevenness and affect the product quality after drying. For solving the problems, authors designed a U-shaped tunnel-drying room for aquatic products. Some key techniques were analyzed and studied, which contains cross flow drying, switching forward and reverse airflow, on-line controlling of temperature and humidity of drying medium and circulating use of heat energy etc.. Compared with single as well as double passageway drying room, evenness of hotting air temperature in U model tunnel was improved, utilization ratio of heat energy was increased, drying time was cut down, and the output of unit volume was increased. The spot experiment of drying grass carp stated that moisture content of products were well distributed after drying, heat energy can be saved about 30% and drying time can be cut down approximate to 30%.