化学结晶造粒流化床技术软化电厂循环水的中试实验研究

Pilot-scale Experiment of Chemical Crystallization Granulation Fluidized Bed Technology for Circulating Water Softening in Power Plant

采用化学结晶造粒流化床系统软化电厂循环水补水和排污水,观测系统软化效果并进行优化。由中试实验结果可知,对循环水补水:当流化床出水pH达到10.8时,NaOH加药量为520 mg/L,Ca^(2+)去除率为90%,吨水处理成本为0.67元左右。对循环水排污水:当流化床出水pH达到10.5时,NaOH加药量为750 mg/L,Ca^(2+)去除率为89%,吨水处理成本为0.97元左右。系统软化处理时产生的结晶颗粒物表面钙含量高,可进行回收,整个系统达到零排放。化学结晶造粒流化床系统具有处理效率高、处理水量大、水质适应性强以及系统自动化程度高等优点,在电厂循环水处理中具有广阔的应用前景。

The chemical crystallization and granulation fluidized bed system was used to soften the circulating water replenishment and blowdown water from circulating water of the power plant.The softening effect of the system was verified and optimized.From the results of the pilot test,for circulating water replenishment,when the fluidized bed effluent pH reached 10.8,the dosage of NaOH was 520 mg/L,the removal rate of Ca^(2+)was90%,and the treatment cost of water was about 0.67 yuan/m^(3).For blowdown water from circulating water,when the fluidized bed effluent pH reached10.5,the dosage of NaOH was 750 mg/L,the removal rate of Ca^(2+)was 89%,and the treatment cost of water was about 0.97 yuan/m^(3).The surface of the crystalline particles produced during the system softening process had a high calcium content,which could be recovered,and the entire system achieved zero emissions.The chemical crystal granulation fluidized bed system has the advantages of high treatment efficiency,large amount of treated water,strong water quality adaptability,and high degree of system automation.It has broad application prospects in circulating water treatment of power plants.