适应水质波动性的燃煤电厂脱硫废水软化工艺研究

Study on softening process adapted to water quality fluctuation for desulfurization wastewater of coal-fired power plants

根据燃煤电厂高镁型脱硫废水的水质特点,针对目前软化工艺存在的运行问题,提出三级加药“离子平衡”方案。结果表明,脱硫废水中的n(Mg^(2+))∶n(SO_(4)^(2-))调节至1∶1时,与未进行水质调节的现有化学软化法相比,石灰乳Ca(OH)_(2)的利用率从81%提高到94%,后续Na_(2)CO_(3)的加药量减少72%。该方案对多种水质均有明显的成本优势,并进一步提出2座均化池的组合设计,便于实际应用在工程项目中。

According to the water quality of desulfurization wastewater with high magnesium ions and the current problems of softening process in coal-fired power plants,a three-stage"anion-cation balance"softening technology was proposed.The research result showed,when the concentration ratio of Mg^(2+)and SO_(4)^(2-)was adjusted to 1∶1,compare to the existing chemical softening process without water quality adjustment,the utilization of Ca(OH)_(2) increased from81%to 94%.Furthermore,the dosage of subsequent Na2 CO3 was effectively reduced by 72%.The technical solution had obvious cost advantage for various water qualities.In order to apply in practical engineering application,the combined design of two equalization basin was further proposed.