Back to Search
Start Over
Migration and agglomeration of chlorine in dechlorination of coal-fired flue gas
- Source :
- Chemical Papers. 75:5907-5916
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Dechlorination of coal-fired flue gas is a novel approach for realizing zero discharge of desulfurization wastewater. The core principle is to convert the HCl in the flue gas into chloride salt, which will migrate into the fly ash. Pilot-scale experiments were conducted to research the migration and agglomeration of chlorine in actual coal-fired flue gas in a power plant. The results indicate that the HCl removal efficiency in flue gas can rise to 70% at a Na/Cl molar ratio of 7.58 when using NaOH solution with clean water or a ratio of 8.93 when using NaOH solution with desulfurization wastewater. XPS shows that the characteristic peak of chloride in the dechlorinated ash is much more pronounced than that in the original ash. The content of inorganic chloride increases significantly with increasing Na/Cl or the utilization of desulfurization wastewater. SEM–EDS indicates that the various salts agglomerated on the fly ash surface notably increase after dechlorination. The contents of Na, Ca, Mg, Fe and S in the ash increase remarkably, especially with desulfurization wastewater. The chloride salts generated by flue gas dechlorination and the pollutants in the desulfurization wastewater are effectively agglomerated with the fly ash.
- Subjects :
- Pollutant
Flue gas
Chemistry
Economies of agglomeration
General Chemical Engineering
chemistry.chemical_element
General Chemistry
Biochemistry
Chloride
Industrial and Manufacturing Engineering
Flue-gas desulfurization
Wastewater
Environmental chemistry
Fly ash
Materials Chemistry
medicine
Chlorine
medicine.drug
Subjects
Details
- ISSN :
- 25857290 and 03666352
- Volume :
- 75
- Database :
- OpenAIRE
- Journal :
- Chemical Papers
- Accession number :
- edsair.doi...........4c2e085e65762283cb15f7ef7275352d