Optimization and mechanism of wet desulfurization with fly ash based on response surface
To investigate the desulfurization effect and mechanism of fly ash as a desulfurized, single factor experiment and response surface method were used to analyze the parameters of ash slurry solid-liquid mass ratio , SO2 volume fraction, and gas flow rate, and the reaction mechanism of fly ash wet des...
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| Format: | Article |
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Editorial Department of Coal Science and Technology
2025-05-01
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| Series: | Meitan kexue jishu |
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| Online Access: | http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2024-0351 |
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| author | Kai JU Ying LIU Xin LI Wuang REN Zheng YU Renlong TANG Pengkang JIN Liping SUN |
| author_facet | Kai JU Ying LIU Xin LI Wuang REN Zheng YU Renlong TANG Pengkang JIN Liping SUN |
| author_sort | Kai JU |
| collection | DOAJ |
| description | To investigate the desulfurization effect and mechanism of fly ash as a desulfurized, single factor experiment and response surface method were used to analyze the parameters of ash slurry solid-liquid mass ratio , SO2 volume fraction, and gas flow rate, and the reaction mechanism of fly ash wet desulfurization was investigated by X-ray fluorescence spectroscopy and scanning electron microscopy. The results show that within a certain range, increasing the solid-liquid ratio can increase the penetration time, the total adsorption capacity of SO2, and the adsorption capacity of SO2 per unit of fly ash slurry by increasing the pH. However, when the solid-liquid ratio exceeds 1∶1, the penetration time and adsorption capacity of SO2 will decrease. With the increase in SO2 volume fraction, the adsorption capacity of fly ash slurry to SO2 first increased and then decreased. When the SO2 volume fraction was 750×10−6, the maximum adsorption capacity was 64.35 mg, High SO2 volume fraction can significantly reduce the penetration time. With the increase of the gas flow rate, the penetration time, the total adsorption amount of SO2, and the adsorption amount of SO2 per unit mass of fly ash slurry decreased. The results of response surface analysis are shown by denoting the three factors of solid-liquid ratio, SO2 concentration and gas flow rate as A, B and C, respectively, and their interaction terms as AB, AC and BC, respectively: the primary and secondary order of the factors affecting the penetration time were C, B, A, BC, AC, and AB. The primary and secondary order of the factors affecting the total adsorption capacity of SO2 is B, A, C, AB, BC and AC. The primary and secondary order of factors affecting the adsorption of SO2 per unit mass of fly ash slurry is A, B, C, AB, AC and BC. The optimum desulphurisation process conditions are as follows: the solid/liquid ratio is 0.87, the SO2 volume fraction is 472×10−6 and the gas flow rate is 1 500 mL/min. XRF and SEM analysis of fly ash before and after desulfurization show that the sulfur oxide content of fly ash after desulfurization increases significantly, and the original surface plate Ca(OH)2 forms CaSO4·2H2O and CaO·Al2O3·3CaSO4·32H2O in bulk and rod. The possible desulfurization mechanism is that fly ash dissolves a large amount of Ca2+ and OH− in water. SiO2 and Al2O3 react with Ca(OH)2 under strong alkaline conditions to form cementitious materials such as hydrated calcium silicate and hydrated calcium aluminate (C−S−H and C−A−H gels).When the sulfur-containing flue gas passes into the fly ash slurry, SO2 is transferred to the liquid phase, forming H+, \begin{document}${\mathrm{HSO}}_3^- $\end{document} and \begin{document}${\mathrm{SO}}_3^{2-} $\end{document}, and H+ reacts with the fly ash slurry, leaching Ca2+, Fe3+ and other elements contained in the fly ash and catalyzing oxidation of SO2 gas dissolved in the fly ash slurry to produce H2SO4 and CaSO4. After combining with water molecules in the slurry, CaSO4 was precipitated in the form of CaSO4·2H2O. |
| format | Article |
| id | doaj-art-c673f57a018a4712a3e4b1007b5bf854 |
| institution | Kabale University |
| issn | 0253-2336 |
| language | zho |
| publishDate | 2025-05-01 |
| publisher | Editorial Department of Coal Science and Technology |
| record_format | Article |
| series | Meitan kexue jishu |
| spelling | doaj-art-c673f57a018a4712a3e4b1007b5bf8542025-08-20T03:24:40ZzhoEditorial Department of Coal Science and TechnologyMeitan kexue jishu0253-23362025-05-0153540742210.12438/cst.2024-03512024-0351Optimization and mechanism of wet desulfurization with fly ash based on response surfaceKai JU0Ying LIU1Xin LI2Wuang REN3Zheng YU4Renlong TANG5Pengkang JIN6Liping SUN7School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaShaanxi Binchang Mining Group Power Generation Company, Xianyang 712000, ChinaSchool of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Energy, Xi’an University of Science and Technology, Xi’an 710054, ChinaSchool of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaShaanxi Modern Construction Design Institute, Xi’an 710024, ChinaTo investigate the desulfurization effect and mechanism of fly ash as a desulfurized, single factor experiment and response surface method were used to analyze the parameters of ash slurry solid-liquid mass ratio , SO2 volume fraction, and gas flow rate, and the reaction mechanism of fly ash wet desulfurization was investigated by X-ray fluorescence spectroscopy and scanning electron microscopy. The results show that within a certain range, increasing the solid-liquid ratio can increase the penetration time, the total adsorption capacity of SO2, and the adsorption capacity of SO2 per unit of fly ash slurry by increasing the pH. However, when the solid-liquid ratio exceeds 1∶1, the penetration time and adsorption capacity of SO2 will decrease. With the increase in SO2 volume fraction, the adsorption capacity of fly ash slurry to SO2 first increased and then decreased. When the SO2 volume fraction was 750×10−6, the maximum adsorption capacity was 64.35 mg, High SO2 volume fraction can significantly reduce the penetration time. With the increase of the gas flow rate, the penetration time, the total adsorption amount of SO2, and the adsorption amount of SO2 per unit mass of fly ash slurry decreased. The results of response surface analysis are shown by denoting the three factors of solid-liquid ratio, SO2 concentration and gas flow rate as A, B and C, respectively, and their interaction terms as AB, AC and BC, respectively: the primary and secondary order of the factors affecting the penetration time were C, B, A, BC, AC, and AB. The primary and secondary order of the factors affecting the total adsorption capacity of SO2 is B, A, C, AB, BC and AC. The primary and secondary order of factors affecting the adsorption of SO2 per unit mass of fly ash slurry is A, B, C, AB, AC and BC. The optimum desulphurisation process conditions are as follows: the solid/liquid ratio is 0.87, the SO2 volume fraction is 472×10−6 and the gas flow rate is 1 500 mL/min. XRF and SEM analysis of fly ash before and after desulfurization show that the sulfur oxide content of fly ash after desulfurization increases significantly, and the original surface plate Ca(OH)2 forms CaSO4·2H2O and CaO·Al2O3·3CaSO4·32H2O in bulk and rod. The possible desulfurization mechanism is that fly ash dissolves a large amount of Ca2+ and OH− in water. SiO2 and Al2O3 react with Ca(OH)2 under strong alkaline conditions to form cementitious materials such as hydrated calcium silicate and hydrated calcium aluminate (C−S−H and C−A−H gels).When the sulfur-containing flue gas passes into the fly ash slurry, SO2 is transferred to the liquid phase, forming H+, \begin{document}${\mathrm{HSO}}_3^- $\end{document} and \begin{document}${\mathrm{SO}}_3^{2-} $\end{document}, and H+ reacts with the fly ash slurry, leaching Ca2+, Fe3+ and other elements contained in the fly ash and catalyzing oxidation of SO2 gas dissolved in the fly ash slurry to produce H2SO4 and CaSO4. After combining with water molecules in the slurry, CaSO4 was precipitated in the form of CaSO4·2H2O.http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2024-0351fly ashwet desulfurizationsolid-liquid mass ratioresponse surface analysisdesulfurization mechanism |
| spellingShingle | Kai JU Ying LIU Xin LI Wuang REN Zheng YU Renlong TANG Pengkang JIN Liping SUN Optimization and mechanism of wet desulfurization with fly ash based on response surface Meitan kexue jishu fly ash wet desulfurization solid-liquid mass ratio response surface analysis desulfurization mechanism |
| title | Optimization and mechanism of wet desulfurization with fly ash based on response surface |
| title_full | Optimization and mechanism of wet desulfurization with fly ash based on response surface |
| title_fullStr | Optimization and mechanism of wet desulfurization with fly ash based on response surface |
| title_full_unstemmed | Optimization and mechanism of wet desulfurization with fly ash based on response surface |
| title_short | Optimization and mechanism of wet desulfurization with fly ash based on response surface |
| title_sort | optimization and mechanism of wet desulfurization with fly ash based on response surface |
| topic | fly ash wet desulfurization solid-liquid mass ratio response surface analysis desulfurization mechanism |
| url | http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2024-0351 |
| work_keys_str_mv | AT kaiju optimizationandmechanismofwetdesulfurizationwithflyashbasedonresponsesurface AT yingliu optimizationandmechanismofwetdesulfurizationwithflyashbasedonresponsesurface AT xinli optimizationandmechanismofwetdesulfurizationwithflyashbasedonresponsesurface AT wuangren optimizationandmechanismofwetdesulfurizationwithflyashbasedonresponsesurface AT zhengyu optimizationandmechanismofwetdesulfurizationwithflyashbasedonresponsesurface AT renlongtang optimizationandmechanismofwetdesulfurizationwithflyashbasedonresponsesurface AT pengkangjin optimizationandmechanismofwetdesulfurizationwithflyashbasedonresponsesurface AT lipingsun optimizationandmechanismofwetdesulfurizationwithflyashbasedonresponsesurface |