脱硫废水处理系统优化设计研究

Study on optimal design of desulfurization wastewater treatment system

国内电站脱硫废水处理系统通常采用调节pH、投加絮凝剂及有机硫,经浓缩澄清处理后,产水用于干灰拌湿。工程实际运行中,常规工艺一方面容易发生管路堵塞,设备运行不稳定,导致出水水质超标,造成环境污染;另一方面计量泵加药量难以控制,容易引起运行费用的升高。以某百万机组电站工程为例,通过脱硫废水处理系统优化设计研究,制定解决方案,一是改进工艺设计,消除系统内污堵因素;二是进行现场试验,确定各种药品的最佳投药量,保证系统出水品质符合标准。

Power plant＇s wastewater desulfurization system usually includes adjusting pH and dosing flocculantts and organic sulfur. After concentration and clarification, the treated water is used for dry ash mixing and wetting. In practice, this conventional process is prone to pipeline fouling and unstable operation of the equipment, resulting in unsatisfactory effluent quality and en- vironmental pollution. On the other hand, the dosage of the metering pumps is difficult to control, which easily leads to the increase of operating costs. Taking a 1 000 MW power station proiect as an example, this paper put forward solutions through： the first, improving the process design to e- liminate the fouling factors within the system; and the second, determining the optimal dosages by field tests to ensure that the product water quality conforms to the standards.