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目前,木材干燥主要是用蒸汽,而且蒸汽耗量较大。改进木材干燥工艺,减少蒸汽用量,是节约能源的一项措施。过去汽车厂木材干燥是采用干球温度高、湿球温度低即有温、湿度差的方法进行终了处理,以消除木材干燥末期由于表面和内部水份梯度所产生的残余应力(这种残余应力不消除,会降低木材的机械强度,会使制成的木制品开裂或变形)。但是,这种处理方法耗蒸汽量大,浪费能源。我们根据生产实践经验和有关资料介绍,将原方法改为关闭加热器、打开喷蒸管的无温度差高湿度终了处理,经过数月几十次生产性试验,取得了初步效果。
At present, wood drying mainly uses steam, and steam consumption is large. Improving the wood drying process and reducing steam consumption is a measure to save energy. In the past, wood drying in automobile plants was carried out by using a method with a high dry-bulb temperature and a low wet-bulb temperature, ie, temperature and humidity difference, to eliminate the residual stress caused by surface and internal moisture gradients at the end of the wood drying process. Without elimination, the mechanical strength of the wood will be reduced, and the resulting wood product will be cracked or deformed. However, this method of processing consumes large amounts of steam and wastes energy. According to production experience and relevant data, we changed the original method to turn off the heater and turn off the steam pipe without temperature difference and high humidity. After several months of productive tests, we achieved preliminary results.