The single crystal growth rates of potassium sulfate in pure aqueous solution under different conditions were determined by photomicrography in a flow system for crystal growth. The effects of the main controlling fac...The single crystal growth rates of potassium sulfate in pure aqueous solution under different conditions were determined by photomicrography in a flow system for crystal growth. The effects of the main controlling factors, such as supersaturation, crystal size, solution velocity and crystal growth temperature, on crystal growth rates of potassium sulfate were discussed in detail by using non-linear regression from the experimental data, and several empirical relationships were given.The results showed that the growth rates of crystals increased with supersaturation, crystal size, solution velocity and temperature. Moreover supersaturation was the most important controlling factor influencing growth rates of crystals,crystal size and solution velocity were the secondary and temperature was the least. Furthermore, It was found that the growth rate of crystals along the crystallographic axis was higher than that along the in the same condition. The effect of every factor on crystal growth rates along the crystallographic axis was stronger than that along the .展开更多
在自行设计的一套高密度下行循环流化床中(80 mm ID, 高5.6 m),对下行床内相结构进行了实验研究.实验结果显示:稀密两相时间分率的径向分布中心区域比较均匀,变化范围在10%～20%之间;轴向密相尺寸在十几毫米之间,密相内颗粒平均浓度为...在自行设计的一套高密度下行循环流化床中(80 mm ID, 高5.6 m),对下行床内相结构进行了实验研究.实验结果显示:稀密两相时间分率的径向分布中心区域比较均匀,变化范围在10%～20%之间;轴向密相尺寸在十几毫米之间,密相内颗粒平均浓度为床层浓度的1.7倍,稀相颗粒浓度约为平均浓度的40%.在下行床中,稀密两相的转变是一渐变过程,而提升管内两相的转变是突变.通过比较高密度下行床与高密度提升管内密相特性,发现下行床内的密相因停留时间短、尺寸小和密度低而难以观察到.展开更多
文摘The single crystal growth rates of potassium sulfate in pure aqueous solution under different conditions were determined by photomicrography in a flow system for crystal growth. The effects of the main controlling factors, such as supersaturation, crystal size, solution velocity and crystal growth temperature, on crystal growth rates of potassium sulfate were discussed in detail by using non-linear regression from the experimental data, and several empirical relationships were given.The results showed that the growth rates of crystals increased with supersaturation, crystal size, solution velocity and temperature. Moreover supersaturation was the most important controlling factor influencing growth rates of crystals,crystal size and solution velocity were the secondary and temperature was the least. Furthermore, It was found that the growth rate of crystals along the crystallographic axis was higher than that along the in the same condition. The effect of every factor on crystal growth rates along the crystallographic axis was stronger than that along the .
文摘在自行设计的一套高密度下行循环流化床中(80 mm ID, 高5.6 m),对下行床内相结构进行了实验研究.实验结果显示:稀密两相时间分率的径向分布中心区域比较均匀,变化范围在10%～20%之间;轴向密相尺寸在十几毫米之间,密相内颗粒平均浓度为床层浓度的1.7倍,稀相颗粒浓度约为平均浓度的40%.在下行床中,稀密两相的转变是一渐变过程,而提升管内两相的转变是突变.通过比较高密度下行床与高密度提升管内密相特性,发现下行床内的密相因停留时间短、尺寸小和密度低而难以观察到.
