北排清河二厂污泥脱水工艺节能降耗优化运行策略

Optimized Operation Strategy for Energy Saving and Consumption Reductionof Sludge Dewatering Process in Qinghe Ⅱ Reclaimed Water Plant of BeijingDrainage Group

在“碳达峰、碳中和”的政策驱动下,为优化脱水工艺实现节能减排,2022年北排清河第二再生水厂污泥处理中心通过对浓缩机、预脱水机、板框压滤机三个生产区域的设备处理量、运行数量和台时进行调控,实现了脱水区域电单耗的显著降低。通过提升浓缩机的进泥负荷、减少设备开机频次,该区域电单耗下降17.52 kW·h/tDS;通过优化预脱水机开机频次和螺旋输送机运行,该区域电单耗下降3.48 kW·h/tDS;通过对板框区域采取分区运行、低压进泥泵低频率运行、无进料回流运行等措施,该区域电单耗同比下降约51.89 kW·h/tDS。采取以上工艺调控措施后,2022年脱水区域总电单耗为324.39 kW·h/tDS,较2021年下降17.9%,节电对应CO_(2)减排量约1 440.09 t。

Driven by the policy of“carbon peak and carbon neutrality”,in order to optimize the energy saving and emission reduction of dewatering process,the sludge treatment center of QingheⅡreclaimed water plant of Beijing Drainage Group realized significantly reduction of unit power consumption in the dewatering area in 2022 by regulating the equipment treatment capacity,equipment operation quantity and unit hours in the three production areas of thickener,pre-dehydrator and plate and frame filter press.By increasing the sludge load of thickener and reducing the frequency of equipment start-up,the unit power consumption in this area decreased by 17.52 kW·h/tDS.By optimizing the start-up frequency of the pre-dehydrator and the operation of the screw conveyor,the unit power consumption in this area decreased by 3.48 kW·h/tDS.The unit power consumption in the plate and frame area decreased by 51.89 kW·h/tDS year on year by taking measures such as zoning operation,low frequency operation of low pressure sludge pump and no feed reflux operation.Through the above process control measures,the total unit power consumption in the dewatering area have decreased to 324.39 kW·h/tDS in 2022,17.9%lower than that in 2021,and the power saving corresponds to about 1440.09 t of CO2 emission reduction.