| 典型燃煤锅炉烟气中可凝结颗粒物排放特征研究 |
| Study on the Emission Characteristics of Condensable Particulate Matter in Flue Gas of Coal-Fired Heating Boilers |
| 投稿时间：2024-05-28 修订日期：2024-10-28 |
| DOI：10.19316/j.issn.1002-6002.2025.04.12 |
| 中文关键词: 典型燃煤锅炉 可凝结颗粒物 排放特征 |
| 英文关键词:typical coal-fired boilers condensable particulate matter emission characteristics |
| 基金项目: |
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| 通讯作者:李雷刚* 河南省洛阳生态环境监测中心, 河南 洛阳 471000 |
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| 中文摘要: |
| 采用美国环保署Method 202对某4台典型燃煤锅炉烟气中的可凝结颗粒物(CPM)进行了采样分析,结果表明:进行过超低排放改造的4台受试锅炉烟气中的可过滤颗粒物(FPM)的浓度均小于5 mg/m3,CPM浓度分别高达(29.7±7.3) mg/m3、(66.9±7.8) mg/m3、(67.4±8.2) mg/m3、(9.8±1.3) mg/m3。CPM离子构成中,阴离子以硫酸根离子、氯离子、硝酸根离子为主,阳离子以铵根离子为主。CPM的形成主要与脱硫浆液中溶解的硫酸铵及氯化铵等易溶盐分有关,与脱硫工艺采用的脱硫剂种类无明显关联。选择性非催化还原(SNCR)脱硝工艺过量喷氨会导致氨逃逸及CPM浓度增高,这些CPM进入大气后会形成气溶胶,进而加重空气污染。实验研究证明,CPM在典型燃煤锅炉烟气中不可忽视。关于如何高效治理CPM以及优化CPM采样分析流程,需要环保科研人员开展进一步的研究和实践。 |
| 英文摘要: |
| Condensable particulate matter (CPM) in flue gas of four typical coal-fired boilers was sampled and analyzed by US EPA Method 202.The results showed that the filterable particulate matter (FPM) concentrations of the four tested boilers that had upgraded ultra-low emission were all less than 5 mg/m3,while CPM concentrations reached (29.7±7.3) mg/m3,(66.9±7.8) mg/m3,(67.4±8.2) mg/m3,and (9.8±1.3) mg/m3,respectively.Ionic composition analysis revealed sulfate,chloride,and nitrate as dominant anions,with ammonium being the primary cation.CPM formation primarily correlated with soluble salts such as ammonia sulfate and ammonium chloride dissolved in the desulfurization slurry,showing no significantly related to the type of desulfurizer used in the desulfurization process.Excessive ammonia injection in selective non-catalytic reduction (SNCR) denitrification process contributed to ammonia escape and elevated the concentration of CPM.These CPM will form aerosols after entering the atmosphere and aggravate air pollution.Experimental studies demonstrate that CPM can not be ignored in the flue gas of typical coal-fired boilers.How to effectively control CPM and optimize the sampling and analysis process of CPM requires environmental protection researchers to carry out further sufficient research and practice. |
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