石灰石-石膏湿法烟气脱硫废水处理的研究

Study on the wastewater treatment in limestone-gypsum wet FGD process

对脱硫废水的水量、水质特点进行详细阐述,通过对几种常见的脱硫废水处理方法,尤其是脱硫废水化学处理法详细的分析比较,提出脱硫废水应首先用于水力除灰,对于干除灰的电厂应设置独立的化学水处理系统进行处理,当全厂的水量难以平衡且环保对排水的含盐量要求严格时,脱硫废水宜进行蒸发处理。由于脱硫废水与常规的电厂废水水质差别较大,脱硫废水处理系统宜单独设置,应与全厂的工业废水处理系统集中布置。脱硫工艺用水应尽量采用处理合格后的酸碱废水等品位较低的水。为准确预测脱硫废水量,应对燃煤中的Cl或烟气中HCl的质量浓度进行测定。

The quantity and quality feature of wastewater from FGD system were described in detail. Based on the comparison of several common treating methods, especially the chemical water treatment system for the wastewater from FGD system, the FGD wastewater was proposed to be used for the ash trench system firstly and separate wastewater treatment system should be set in power plant with dry ash handling system. If the water-balance for the plant is difficult to maintain, and the salinity of treated waste can not meet the requirement of the environmental protection criterion, the evaporation treatment for the FGD wastewater should be considered. Since the quality of FGD waste is quite different from that in conventional power plant, the FGD wastewater treatment system should be set separately, arranged near the industrial wastewater disposal system .The treated and acceptable acid and alkali wastewater with lower quality should be used for FGD. For estimating the quantity of FGD wastewater accurately, the content of element Cl in coal and HCl in flue gas should be determined.