基于气-液传质氨法脱硫喷淋吸收CFD仿真模拟

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Abstract Combining with the research of SO₂ mass transfer in the process of ammonia-based desulfurization, the CFD calculation method which could calculate the SO₂ removal efficiency was developed with the CFD secondary development technique by coupling the multi-component chemical reaction in the ammonia desulfurization droplet, the mass transfer between the droplet and the gas phase (double membrane theory), and the droplet evaporation phase change. The three-dimensional model was established based on this method could calculate the flue gas flow rate, pH value, liquid-to-gas ratio, atomized particle size, and initial SO₂ concentration on the desulfurization effect. The results show that the simulation results and the experimental data have the similar tendency varying with the operational factor and the relative error between the two is less than ±20%. By calculating the influence of key parameters such as pH value and slurry particle size on the distribution of NH₃ and SO₂ concentration on the vertical centerline in the desulfurization tower, the pH and particle size of the slurry can be controlled to improve the desulfurization efficiency and reduce the NH₃ escape. The experimental and numerical simulations results show that the recommended flue gas flow rate is 2~3m/s, the slurry pH value is 5~6, gas-liquid ratio is 2.5~3.5L/m³ and the atomized particle size is 0.8~1mm for the ammonia desulfurization system.

Key words： ammonia-based desulfurization mass transfer absorption CFD simulation

Received: 23 August 2022

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X511

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	Articles by authors
	YANG Guo-hua
	WU Di
	GOU Yuan-Bo
	XU Bing
	CHEN Ya-fen
	ZHANG Ming
	JIA Yong

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YANG Guo-hua,WU Di,GOU Yuan-Bo等. CFD simulation of spray absorption of ammonia-based desulfurization based on gas-liquid mass transfer[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1519-1527.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/1519

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