印染污泥焚烧烟气污染控制案例分析

以广东省某两家印染厂的印染污泥焚烧项目为主要研究对象,从污泥处理技术路线、焚烧设备及烟气处理流程等各方面入手,对各厂印染污泥与煤混烧烟气中颗粒物、NOx、SO2、酸性气体(HF、HCl)和重金属等污染物的进行采样分析,并对各厂现有烟气污染物控制设施的运行效果进行调研,结果表明,布袋除尘的效果较为理想,除尘效率可达99%以上;使用印染废水作为吸收液的湿法脱硫技术对SO2及酸性气体的去除效果不理想;SNCR对NOx具有一定的去除效果,是一种较为经济、高效的脱硝技术;焚烧后,大部分重金属最终以飞灰的形式被除尘器去除,但仍有部分重金属如Hg在出口烟气中的浓度仍然很高,需要采取必要的措施控制烟气中的重金属. 此外,基于印染污泥焚烧实例分析,提出适于印染污泥与煤混烧烟气处理工艺流程.

Analysis of air pollutants emission control cases on textile dyeing sludge incineration

Two sludge incineration projects of textile dyeing factories in Guangdong Province were studied. Starting from the survey of sludge treatment technique routes, incineration facilities and flue gas treatment processes, air pollutants of sludge and coal co-combustion such as dust, NOx, SO2, acid gases (HF and HCl), heavy metals and the removal efficiency of different pollutant control facilities of each project were clarified by means of on-site sampling analysis and investigation. The result shows that the effect of bag filter is satisfying, the removal efficiency could reach more than 99%; FGD technology which using textile dyeing wastewater as absorbent is not suitable for SO2 and acid gases removal; SNCR technology is economical and efficient for NOx removal; most heavy metals existing in dust could be removed by filters, while the concentration of some heavy metals (such as Hg) in outlet gas is still high, in which extra measures need to be taken to control heavy metals in flue gas. In addition, a process of dyeing sludge and coal co-incineration flue gas treatment is put forward according to the analysis of textile dyeing sludge incineration examples.