| Citation: |
JU Kai，LIU Ying，LI Xin，et al. Optimization and mechanism of wet desulfurization with fly ash based on response surface[J]. Coal Science and Technology，2025，53（5）：407−422. DOI: 10.12438/cst.2024-0351
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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+, HSO−3 and SO2−3, 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.
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