基于离散度大豆蛋白液喷涂雾化粒度均匀性的研究

Research on particle size uniformity of spraying atomization of soybean protein liquid based on degree of dispersion

为有效获得质量均匀的大豆蛋白膜,采用Spraylink粒度仪的测试机理和离散度,通过二维喷涂雾化平台移动喷嘴,对喷涂雾化场中心轴轴向和径向上的不同位置点进行粒度测量,进而计算离散度以分析雾化粒度的均匀性。结果表明:在喷涂气压为0.24 MPa时,离散度值的变化范围基本是0.45~0.65,随着距喷嘴距离的增加,其值快速减小,即在喷涂流量和喷涂液压为固定值时,喷涂气压增大,大豆蛋白液喷涂雾化液滴更均匀、粒径更小。在喷涂流量和喷涂气压为固定值,喷涂液压为0.24 MPa时,离散度值的变化范围基本是0.34~0.63,即喷涂液压增大,有利于大豆蛋白液喷涂,雾化更均匀;同时喷涂流量对大豆蛋白液喷涂雾化场的中心轴线方向雾化均匀性有影响。在喷涂控制参数都为定值时,随着距喷嘴距离的增大,雾化离散度值减小,雾化粒子分布更集中、均匀,喷涂雾化粒子场均匀性更好。研究为大豆蛋白液喷涂覆膜提供有效的喷涂控制参数参考。

In order to effectively obtain soybean protein film with uniform quality,by using the testing mechanism and dispersion of the Spraylink particle size analyzer and moving the nozzle through the two-dimensional spraying atomization platform,the particle size was measured at different points in the axial and radial direction of the central axis of the spraying atomization field,and then the dispersion was calculated so as to analyze uniformity of atomized particle size.The results show that when the spraying air pressure is 0.24 MPa,the variation range of dispersion value is basically 0.45-0.65,and with the increase of the distance from the nozzle,the value decreases rapidly,that is,when the spraying flow and spraying hydraulic pressure are fixed values,the spraying air pressure increases,and the spraying atomized droplets of soybean protein liquid are more uniform and the particle size is smaller.When the spraying flow rate and spraying air pressure are fixed values,when the spraying hydraulic pressure is 0.24 MPa,the variation range of dispersion value is basically 0.34-0.63,that is,the spraying hydraulic pressure increases,which is conducive to soybean protein liquid spraying and atomization is more uniform;at the same time,the spraying flow rate has an impact on the atomization uniformity in direction of the central axis of the spraying atomization field of soybean protein liquid.When the spraying control parameters are all fixed values,as the distance from the nozzle increases,the atomization dispersion value decreases,the distribution of atomized particles is more concentrated and uniform,and the uniformity of the spray atomized particle field is better.The study provides a reference for effective spraying control parameters for soy protein liquid spraying coating.