自来水厂后臭氧接触池进水流量的在线软测量方法
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摘要
针对自来水厂后臭氧接触池进水流量无法在线测量的问题,提出了一种后臭氧接触池进水流量的在线软测量方法。首先,通过在线测试获得后臭氧接触池进水前提升泵房的各台提升泵运行在最大工作扬程和最小工作扬程下的频率-流量关系曲线;然后,计算生成当前工作扬程下的频率-流量关系曲线,并由此获得提升泵当前频率对应的实时流量;最后,计算提升泵房所有运转提升泵的出水流量之和,从而获得后臭氧接触池进水流量软测量值。实际应用结果表明,与先前的以活性炭滤池出水流量计的数值作为参考流量相比,提出的软测量方法能更准确地反映后臭氧接触池的实时进水流量,根据这一基准流量进行臭氧投加可使后臭氧接触池出水余臭氧浓度更加平稳,为后臭氧投加精确控制奠定了基础。
An on-line soft measurement method was proposed to measure the influent flow rate of the post-ozonation contact reactor. First,the relationship between frequency and flow rate under the maximum and minimum working head of each pump in the pumping station before the post-ozonation contact reactor was developed through on-line tests. Second,the relationship curve between frequency and flow rate under the current working head was calculated to determine the real-time flow rate of the pump under current frequency. Finally,the total effluent flow rate from the pumping station was calculated,and the real-time influent flow rate of the post-ozonation contact reactor was obtained. The results showed that,in comparison with existing method which used effluent flow rate of the biological activated carbon filter as a reference,the soft measurement method proposed was more accurate to quantify the real-time influent flow rate of the post-ozonation contact reactor. The ozone residual in the effluent of the post-ozonation contact reactor was more stable under this baseline flow rate,which provided a basis for the accurate control of ozone dosing.
An on-line soft measurement method was proposed to measure the influent flow rate of the post-ozonation contact reactor. First,the relationship between frequency and flow rate under the maximum and minimum working head of each pump in the pumping station before the post-ozonation contact reactor was developed through on-line tests. Second,the relationship curve between frequency and flow rate under the current working head was calculated to determine the real-time flow rate of the pump under current frequency. Finally,the total effluent flow rate from the pumping station was calculated,and the real-time influent flow rate of the post-ozonation contact reactor was obtained. The results showed that,in comparison with existing method which used effluent flow rate of the biological activated carbon filter as a reference,the soft measurement method proposed was more accurate to quantify the real-time influent flow rate of the post-ozonation contact reactor. The ozone residual in the effluent of the post-ozonation contact reactor was more stable under this baseline flow rate,which provided a basis for the accurate control of ozone dosing.
引文
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