烟气制酸净化工序酸泥处理系统优化改造及应用

Optimization and Application of Acid Sludge Treatment System in Off-gas Cleaning Process of an Off-gas based Acid Plant

本文介绍了烟气制酸系统净化工序工艺流程及其设备,针对净化工序运行过程中存在的系统阻力增大、设备及其管道积酸泥、废酸排放超出指标等问题,在酸泥过滤系统进料处增设压力控制器,同时将两台沉降槽底流泵升级为变频泵,利用PID控制实现变频恒压供液的功能。改造后,有效降低了压滤机进料管道压力大的问题,增加了净化工序运行的稳定可靠性,废酸排放达到了废酸处理工序的工艺指标。

This paper introduces the process flow and equipment used in the off-gas cleaning procedure of the acid-making system.To address the problems such as the increase of system resistance,the accumulation of acid sludge in the equipment and pipelines,and the discharge of waste acid in excess of the standard limits during the off-gas cleaning operation,this paper envisages that a pressure controller be added at the feed port of acid sludge treatment system.At the same time,it upgrades the two settling tank underflow pumps into pumps completed with VSDs,enabling variable frequency and constant pressure liquid supply via PID control.After the transformation,it effectively reduces the problem of excessive pressure in the feed pipe of the filter press the operation stability and reliability of the off-gas cleaning system is improved,and the waste acid discharge meets the designed process indexes of the waste acid treatment system.