EMISSION CHARACTERISTICS AND CONTROL SUGGESTIONS OF COLORED SMOKE PLUMES FROM COAL-FIRED POWER PLANTS AND IRON AND STEEL PLANTS'SINTERING PROCESSES
After the ultra-low emission renovation,the conventional air pollutant emissions from the power and steel industries have been significantly reduced.The new problem caused by unconventional pollutants and colored plumes has gradually attracted people's attention for its visual appearance and"de-whitening"problem for a long time.Based on relevant domestic and international standards and methods,the emission levels of SO3,NH3,filterable particulate matter(FPM),and condensable particulate matter(CPM)at the main exhaust ports in three coal-fired power plants and the sintering machine heads of two iron and steel plants were tested to evaluate the effectiveness of ultra-low emission implementation and the feasibility of colored smoke plume control.The results showed that the emission concentrations of SO3,NH3 and FPM from three coal-fired power plants and sintering flue gas of the two steel plants were 0.11 mg/Nm3 to 1.61 mg/Nm3,0.02 mg/Nm3 to 1.66 mg/Nm3,and 0.81 mg/Nm3 to 5.76 mg/Nm3,respectively,which were all at a low level,and the emission concentrations of FPM could all meet the ultra-low emission requirements.After implementing the flue gas"de-whitening"transformation,the emission concentrations of SO3 and NH3 from coal-fired power plants or iron and steel plants'sintering processes decreased significantly,but the emission reduction effect was limited.The CPM emission concentrations from three coal-fired power plants and two steel plants'sintering processes were 3.39 mg/Nm3 to 4.82 mg/Nm3 and 26.6 mg/Nm3 to 29.1 mg/Nm3,respectively.The latter was at a higher level,about 3 times the ultra-low emission limit of particulate matter,and about 32 times of FPM emission concentration,and the CPM/total particulate matter(TPM)reached about 97%.Whether in coal-fired power plants or steel plants,applying"de-whitening"technology might not necessarily significantly reduce CPM emissions.Therefore,the feasibility of adding"whitening"transformation after ultra-low emission transformation is worth pondering.In addition,the online monitoring results of particulate matter in coal-fired power plants and iron and steel plants were both at a relatively low level,and far lower than the TPM emission concentrations measured by manual monitoring.The existing online monitoring data,which does not include CPM,has certain limitations and uncertainties in evaluating the particulate matter emissions in flue gas meeting the standard.Hence,it is urgent to improve the existing measurement system and emission standard system of particulate matter in stationary pollution sources to control the emissions of CPM.
coal-fired power plantiron and steel plantcolored smoke plumeultra-low emissioncondensable particulate matter(CPM)