强制外循环三效蒸发反渗透浓水的中试研究

Pilot research on the treatment of reverse osmosis concentrated water by forced outer-circulation and triple-effect evaporation combined process

利用尿素生产过程中甲胺合成时的余热处理反渗透浓水,设计并建造一套强制外循环三效蒸发结晶处理工艺中试装置,结合试验数据考察各效蒸发器操作参数及运行效果,并对其运行成本进行分析。结果表明,当一、二、三效蒸发器及终冷凝器操作压力分别为-0.01～-0.02、-0.05～-0.06、-0.07～-0.08、-0.085 MPa时,单位蒸汽消耗比约为0.43,蒸发冷凝液电导率≤200μS/cm,可作为脱盐水站或循环水装置补水利用。

A pilot-plant of forced outer-circulation,triple-effective evaporation and crystallization treatment tech- nology has been designed and established, by using the residual heat, while methylamine was synthesized in the urea unit, for treating reverse osmosis concentrated water. Based on experimental data, the operation parameters and run- ning efficacy of every effective evaporator are investigated. Furthermore, its running costs are analyzed. The results show that when the operating pressure of every evaporator and the final condenser are -0.01- -0.02, -0.05- -0.06, -0.07- -0.08, -0.085 MPa, respectively, the unit consumption ratio of steam is about 0.43, and the conductivity of steam condensate is below 200 μS/cm. These results indicate that it could be reused as make-up water in circulating cooling water systems or for desalted water stations.