title: [Emission Characteristics of Water-Soluble Ions in Fumes of Coal Fired Boilers in Beijing].
abstract: Selecting coal fired boilers with typical flue gas desulfurization and dust extraction systems in Beijing as the study objects, the issues and characteristics of the water-soluble ions in fumes of coal fired boilers and theirs influence factors were analyzed and evaluated. The maximum mass concentration of total water-soluble ions in fumes of coal fired boilers in Beijing was 51.240 mg x m(-3) in the benchmark fume oxygen content, the minimum was 7.186 mg x m(-3), and the issues of the water-soluble ions were uncorrelated with the fume moisture content. SO4(2-) was the primary characteristic water-soluble ion for desulfurization reaction, and the rate of contribution of SO4(2-) in total water-soluble ions ranged from 63.8% to 81.0%. F- was another characteristic water-soluble ion in fumes of thermal power plant, and the rate of contribution of F- in total water-soluble ions ranged from 22.2% to 32.5%. The fume purification technologies significantly influenced the issues and the emission characteristics of water-soluble ions in fumes of coal fired boilers. Na+ was a characteristic water-soluble ion for the desulfurizer NaOH, NH4+ and NO3+ were characteristic for the desulfurizer NH4HCO3, and Mg2+ was characteristic for the desulfurizer MgO, but the Ca2+ emission was not increased by addition of the desulfurizer CaO or CaCO3 The concentrations of NH4+ and NO3- in fumes of thermal power plant were lower than those in fumes of industrial or heating coal fired boilers. The form of water-soluble ions was significantly correlated with fume temperature. The most water-soluble ions were in superfine state at higher fume temperature and were not easily captured by the filter membrane.
authors.forename: Yue-qi
authors.initials: YQ
authors.lastname: Hu
authors.forename: Zhao-hui
authors.initials: ZH
authors.lastname: Ma
authors.forename: Ya-jun
authors.initials: YJ
authors.lastname: Feng
authors.forename: Chen
authors.initials: C
authors.lastname: Wang
authors.forename: Yuan-yuan
authors.initials: YY
authors.lastname: Chen
authors.forename: Ming
authors.initials: M
authors.lastname: He
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D002947:Cities; D003031:Coal; D004391:Dust; D004784:Environmental Monitoring; D005740:Gases; D007477:Ions; D052638:Particulate Matter; D011210:Power Plants; D014867:Water
chemical_list: D000393:Air Pollutants; D003031:Coal; D004391:Dust; D005740:Gases; D007477:Ions; D052638:Particulate Matter; D014867:Water