水泥厂超低排放标准及技术研究

Study on ultra-low emission limits and technologies for cement plant

水泥工业大气污染物排放要求持续收严,各地提出了各类超低排放标准,但满足这些标准的改造技术尚不成熟,给后续技改效果带来了不确定性。结合技术原理和技术经济指标,对比分析了NOx、SO2、颗粒物(PM)超低排放改造技术。结合现有技术案例分析发现,NOx收严到50mg/m3技术可达,但改造难度大、经济性欠佳,可先行收严到100mg/m3;采用湿法脱硫,SO2可稳定在35mg/m3以下;PM排放限值收严到10mg/m3较为适宜。同步实施PM、SO2、NOx超低排放改造、多技术组合使用时各技术会相互影响,因此超低排放技术改造需全流程多污染物协同控制。通过分析各技术组合使用的潜在问题,提出适用于不同的PM、SO2、NOx超低排放限值组合的多污染物协同控制技术路线。

The emission equirements of air pollutants in cement industry have been continuously tightened,and various ultra-low emission limits have been proposed.However,the transformation technologies that meet these limits are still immature,which brings uncertainties to the follow-up transformation effect.According to the technology principles,technical and economic indicators,the ultra-low transformation technologies of NO x,SO 2 and particulate matter(PM)were compared and analyzed.Combined with the technical cases,it was found that NO x could be tightened to bellow 50 mg/m 3,but the transformation was difficult and it was uneconomical,so it was recommended that the emission limit could be set to 100 mg/m 3 first.Using wet desulfurization,SO 2 could be stabilized below 35 mg/m 3,and it was more appropriate to tighten the emission limit of PM to 10 mg/m 3.When ultra-low transformation of PM,SO 2 and NO x were simultaneously carried out,each technology would affect each other.Therefore,ultra-low transformation technology should be focused on the whole process of multi-pollutant collaborative control.By analyzing the potential problems of the combined use of various technologies,collaborative control routes of multi-pollutant suitable for different ultra-low emission limits of PM,SO 2 and NO x were proposed.