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Investigation on the influence of sulfur and chlorine on the initial deposition/fouling characteristics of a high-alkali coal
- Source :
- Fuel Processing Technology. 198:106234
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Sodium, calcium, sulfur and chlorine in the flue gas of coal-fired boilers are the main cause of ash deposition/fouling in heat exchangers. However, there are still many debates on the mechanism of ash deposition/fouling due to the lack of direct micro evidence. This paper aims to clarify the initial deposition/fouling characteristics of a high-alkali coal by computer-controlled scanning electron microscopy (CC-SEM). The results demonstrate that temperature has an influence on the deposition/fouling compounds. The crystalline compounds in the samples at 900 °C were mainly CaSO4 and Ca2Al2SiO7, while the compounds in the samples at 500 °C were mainly NaCl. Sulfur had a significant adsorption effect on sodium and calcium at 900 °C, while chlorine had a significant adsorption effect on sodium at 500 °C. A 3-layer microstructure of deposition/fouling was found after the samples were stripped by molecular force. Additionally, deposition/fouling could be divided into three stages: the formation of sodium salt precursors, the growth of loose structural aluminosilicates and the adhesion of particulates on the surface. Sulfates, especially Na2SO4 and CaSO4 formed a precursor for the initial deposition/fouling of high-alkali coal.
- Subjects :
- Flue gas
Fouling
business.industry
020209 energy
General Chemical Engineering
Sodium
Energy Engineering and Power Technology
chemistry.chemical_element
02 engineering and technology
Alkali metal
Sulfur
Fuel Technology
020401 chemical engineering
chemistry
Chemical engineering
0202 electrical engineering, electronic engineering, information engineering
Chlorine
Coal
0204 chemical engineering
business
Deposition (chemistry)
Subjects
Details
- ISSN :
- 03783820
- Volume :
- 198
- Database :
- OpenAIRE
- Journal :
- Fuel Processing Technology
- Accession number :
- edsair.doi...........597903d2e7805aa61b8abfdbabb5f1db