Experimental Study On Brown Rice Vacuum Humidified

Brown rice humidifying is the key production process of germinated brown rice,traditional way of germinated brown rice production process mainly by soaking germinate the brown rice moisture increase to brown rice cultivation conditions,but the internal of brown rice grain moisture increases with soaking way moisture movement too fast,grain of crack is more,which seriously affect the germinated brown rice product quality and its subsequent storage and processing,adopt the method of ventilation humidification can avoid brown rice blast waist rate increasing too large,but there is a positive pressure ventilation humidifying method of condensed water and more condensed water into the the fan,for this purpose,this study proposed the germinated brown rice production technology applied a new method of brown rice vacuum humidification,that is the brown rice add wet under the condition of negative pressure ventilation,and brown rice vacuum humidifying experiment was carried out by self-made test device,influence the effect of brown rice and humidifying process factors,discussed the brown rice humidification process appropriate conditions,for brown rice vacuum humidifying method and its application in germinated brown rice production technology provide basis and reference.The main contents and conclusions of this paper are as follows:(1)Design the brown rice vacuum humidifying experiment device,the device is mainly composed of brown rice humidifying chamber(material box),ultrasonic humidifier,vacuum pumps,pipes,valves,vacuum gauge(u-shaped differential pressure meter),frame,time controller,etc,brown rice vacuum humidification test device dimensions is 0.95m*0.4m* 0.4m,the dimensions of brown rice humidifying chamber is 300mm*120mm*120mm,volume of0.0144m3,the thin material box put in 6.26 kg brown rice every time,test apparatus of open,stop automatic control can be set through the time controller,the experiment device is running stability,convenient adjustment,the performance can achieve the requirement of the brown rice.(2)With brown rice vacuum humidification test device by the thin layer of brown rice vacuum consecutive humidifying experiment results show that,in the 25 to 28 ℃ ambient temperature,under the condition of 50~62% relative humidity,the brown rice moisture by14.65% increases to 16.93~24.58% in 8~12h,different test conditions(humidifying capacity,vacuum),the whole process of brown rice and average humidifying speed is larger difference,0.23~1.24%/h,.The scope of test conditions,brown rice humidification process,as the the brown rice humidifying time extension the moisture is approximate linear increase,namely 2h before the average speed of humidifying differ with average humidification process of speed is smaller.Compared with the positive pressure ventilation humidifying method,brown rice vacuum humidifying method can completely avoid the problem of a large number of water mist and the condensed water into the fan,and may further improve the brown rice moisturecontent after humidification,meet the germinated brown rice production technology requirements for brown rice moisture content increase.(3)In the brown rice vacuum humidification process,with the loss of the vacuum degree and the increased amount of humidifier humidification,brown rice humidifying speed increase,when more than 740g/h amounts of humidification humidification speed increase slowed down trend.(4)The scope of test conditions,brown rice layer thickness,continuous humidification,environment temperature and water level factor of brown rice on the brown rice and humidification process has no greater impact.(5)The most of the theory of humidifier humidification(about 80%)condenses into condensed water without being used,so when brown rice vacuum humidifying used industrialized production,need to consider the humidifying equipment heat insulation measures to reduce the condensation water and on the equipment structure considering condensate collection,discharge,the method of recycling(device).(6)No matter the thin layer or thick layer of humidification,brown rice layer moisture gradient is larger near the humidifier,need to consider such as mixing,alternate negative pressure ventilation way after making the humidifying brown rice moisture balance.(7)The suitable technological conditions of brown rice vacuum humidification,the average speed of humidification was 0.54~0.9%/h,vacuum 0.15~30kpa,humidifying capacity of 380~600g/h,thick layer continuous humidification.Under the condition of the process can control blasting waist rate increases under 10% after brown rice humidifying.