Back to Search
Start Over
Non-Negligible Stack Emissions of Noncriteria Air Pollutants from Coal-Fired Power Plants in China: Condensable Particulate Matter and Sulfur Trioxide
- Source :
- Environmental Science & Technology. 54:6540-6550
- Publication Year :
- 2020
- Publisher :
- American Chemical Society (ACS), 2020.
-
Abstract
- In this study, we investigated the emission characteristics of condensable particulate matter (CPM) and sulfur trioxide (SO3) simultaneously through ammonia-based/limestone-based wet flue gas desulfurization (WFGD) from four typical coal-fired power plants (CFPPs) by conducting field measurements. Stack emissions of filterable particulate matter (FPM) all meet the Chinese ultralow emission (ULE) standards, whereas CPM concentrations are prominent (even exceed 10 mg/Nm3 from two CFPPs). We find that NH4+ and Cl- increase markedly through the ammonia-based WFGD, and SO42- is generally the main ionic component, both in CPM and FPM. Notably, the occurrence of elemental Se in FPM and CPM is significantly affected by WFGD. Furthermore, the established chemical profiles in FPM and CPM show a distinct discrepancy. In CPM, the elemental S mainly exists as a sulfate, and the metallic elements of Na, K, Mg, and Ca mainly exist as ionic species. Our results may indicate that not all SO3 are included in CPM and they co-exist in stack plume. With the substantial reduction of sulfur dioxide (SO2), S distributed in SO3, CPM, and FPM becomes non-negligible. Finally, the emission factors of CPM and SO3 under typical ULE technical routes fall in the ranges of 74.33-167.83 and 48.76-86.30 g/(t of coal) accordingly.
- Subjects :
- China
Sulfur Oxides
Air pollution
010501 environmental sciences
medicine.disease_cause
01 natural sciences
chemistry.chemical_compound
Stack (abstract data type)
Air Pollution
medicine
Environmental Chemistry
Coal
Sulfate
Sulfur dioxide
0105 earth and related environmental sciences
Air Pollutants
business.industry
General Chemistry
Particulates
Flue-gas desulfurization
chemistry
Environmental chemistry
Sulfur trioxide
Environmental science
Particulate Matter
business
Power Plants
Subjects
Details
- ISSN :
- 15205851 and 0013936X
- Volume :
- 54
- Database :
- OpenAIRE
- Journal :
- Environmental Science & Technology
- Accession number :
- edsair.doi.dedup.....4a45aa8331f2837fa71657303b953db1