喷雾结晶法处理高浓盐水实验研究

Experimental Study on Atomizing Crystallization Method for High Concentration Brines Disposal

利用喷雾结晶法对高浓盐水进行处理,通过正交实验讨论了NaCl质量分数、热风温度、进料速度和雾化器转速对NaCl晶体回收率和NaCl晶体含水量的影响。结果表明,喷雾结晶法处理高浓盐水的优化组合为:热风温度160℃,进料体积流量4 L/h,雾化器转速600 r/min。在其它因素不变条件下,随着NaCl含量的增大,NaCl晶体回收率和含水量均呈降低趋势。通过调节风机流量,在干燥室圆锥底处增设气锤,冲刷装置内壁等方法可显著提高NaCl晶体回收率。在NaCl的质量分数为20%、热风温度160℃,雾化器转速600 r/min条件下,以淡水电导率的自然对数对进料量变化回归,确定回归方程为γ=(1.267 m S/cm)exp[0.823 7qV/(L·h^(-1))]。对喷雾结晶法处理高浓盐水进行能耗统计,采用160℃热风温度仅比采用100℃热风温度多增加9.64%的能耗。

Using atomizing crystallization method disposed high concent brines, we discussed the NaCl crystal recovery ratio and moisture ratio influenced by NaCl weight percent, hot-air temperature, feed speed and atomizer rotation speed through orthogonal experiment. The results indicates： The optimum condition is NaCl mass fraction 16%, hot-air temperature 160 ℃, volume flow rate 4 L/h and atomizer rotation speed 600 r/min. With other factors condition remain constant, the NaCl crystal recovery ratio and moisture ratio decrease with an increasing of NaCl content, Though adjusting the flow rate of fans, adding air-hammers in the bottom of device and washing the internal side of device, the NaCl crystal recovery ratio enhanced significantly. With the condition of mass fraction of NaCl 20%, hot-air temperature of 160 ℃ and atomizer rotation speed of 600 r/rain, the regression function of fresh water conductivity with the feed speed is -/=（1.267 mS/cm） exp [0.823 7qv/（L·h^-1）], RZ=-0.9978. Finally, we analyzed the energy consumption of atomizing crystallization method disposed high concentration brines, the energy consumption only increased 9.64% with operational condition turn from 100 ℃ to 160 ℃.