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7 results on '"Yuan Changle"'

3. Experimental and Density Functional Theory Study of the Adsorption Characteristics of CaO for SeO2 in Simulated Flue Gas and the Effect of CO2

Author

Yuan Changle, Chen Gang, Xin Li, Xu Hao, Qingyan Fang, Zhang Cheng, and Yu Shenghui

Subjects
Flue gas, Materials science, Mineral, General Chemical Engineering, fungi, food and beverages, Energy Engineering and Power Technology, chemistry.chemical_element, 02 engineering and technology, 021001 nanoscience & nanotechnology, Fuel Technology, Adsorption, 020401 chemical engineering, chemistry, Chemical engineering, Density functional theory, 0204 chemical engineering, 0210 nano-technology, Selenium
Abstract

Coal-fired power plants have been identified as a major source of selenium emissions that can be controlled by mineral adsorption. The adsorption capacity of CaO for SeO2 adsorption was studied in ...

Published
2020

5. Investigation on the influence of sulfur and chlorine on the initial deposition/fouling characteristics of a high-alkali coal

Author

Gang Chen, Yuan Changle, Qingyan Fang, Yu Shenghui, Ma Lun, Xu Hao, and Cheng Zhang

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)
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.

Published
2020

6. Experimental and Density Functional Theory Study of the Adsorption Characteristics of CaO for SeO2in Simulated Flue Gas and the Effect of CO2

Author

Yuan, Changle, Zhang, Cheng, Yu, Shenghui, Xu, Hao, Li, Xin, Fang, Qingyan, and Chen, Gang

Abstract

Coal-fired power plants have been identified as a major source of selenium emissions that can be controlled by mineral adsorption. The adsorption capacity of CaO for SeO2adsorption was studied in a simulated flue gas atmosphere, and the amounts of SeO2absorbed by CaO before and after high-temperature roasting were experimentally evaluated and compared. To explain the effect of CO2on the adsorption of SeO2, the effect of preadsorbed CO2on SeO2adsorption by CaO was investigated by density functional theory calculations. The experimental results showed that the adsorption capacity reached the maximum at 700 °C, while the adsorption capacity decreased gradually for temperatures higher than 700 °C. CO2in the simulated flue gas caused the carbonation reaction on the surface of CaO, leading to the inhibition of SeO2adsorption by CaO. The computational results indicated that SeO2and CO2adsorb on the CaO surface by chemisorption, with the O atoms on the CaO(001) surface as the adsorption active sites. Not only did CO2occupy the active sites on the surface but also the interaction between the Se atom and the O atom of CO2was found to be weaker than that between the Se atom and the O atom on a clean CaO surface.

Published
2020
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