脱硫石膏灌芯墙脱水过程的仿真模拟与分析

doi:10.11896/cldb.20090275

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Abstract In this work, the physical dehydration process of multi-scale flue gas desulfurization (FGD) gypsum core grouted wall was simulated by using the rare material transfer model in the porous media flow module with COMSOL software and relative theories of material transfer. The simulation was verified by the FGD gypsum core grouted wall dehydration test.The influencing factors of the dehydration of the FGD gypsum core grouted wall, the spatial distribution of free water, and other characteristics in the process of FGD gypsum dehydration were analyzed by controlling model parameters. The results showed that the simulation results were consistent with the experimental results. The dehydration time of 40 mm FGD gypsum under the three relative humidity conditions of 55%, 75% and 82% at 20℃ was about 350 h, 450 h and 500 h, respectively. The lower the relative humidity was, the longer the dehydration time of FGD gypsum was and the greater the influence on the final mass loss rate was, but the influence on the final mass loss rate was small, and the final mass loss rate was about -21%. When the relative humidity was 75%, the dehydration time of 40 mm FGD gypsum at 0 ℃, 10 ℃ and 20 ℃ was about 650 h, 500 h and 450 h, respectively. The rise of temperature accele-rates the dehydration rate and shortens the dehydration time, but it has almost no effect on the final mass loss rate, which always keeps at about -21%. When the temperature was 20 ℃ and the relative humidity was 75%, the mass loss rate of FGD gypsum of 40 mm, 90 mm and 140 mm thickness at 450 h was about -21%, -10% and -5%, respectively, indicating that the thickness significantly increased the dehydration time of FGD gypsum. FGD gypsum dehydration process and the change of concentration of free water filling and grouted wall was from outside to inside. The change of concentration of free water produced concentration gradient belt which moves from outside to inside over time with width gradually widening. When FGD gypsum dehydration was completed, the internal free water concentrations were low, which were 0—0.2×10⁴ mol/m³.

Key words： FGD gypsum cored grouted wall dehydration COMSOL simulation

Published: 10 March 2022 Online: 2022-03-08

CLC number:

TU526

Fund:National Natural Science Foundation of China (51568056) and First-Class Discipline Construction of Universities in Ningxia (NXYLXK2021A03).

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	ZENG Ziyue
	YANG Jiansen
	WEI Yongqi

Cite this article:

ZENG Ziyue,YANG Jiansen,WEI Yongqi. The Simulation and Analysis of Dehydration Process of FGD Gypsum Grouted Wall[J]. Materials Reports, 2022, 36(5): 20090275-6.

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http://www.mater-rep.com/EN/10.11896/cldb.20090275 OR http://www.mater-rep.com/EN/Y2022/V36/I5/20090275

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