Numerical Simulation of Wet Desulfurization by Screw Static Mixer with Different Structure

化学工业与工程

Chemcial Industry and Engineering

2020, Vol. 37

Issue (3) :50-59 DOI: 10.13353/j.issn.1004.9533.20191510

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Numerical Simulation of Wet Desulfurization by Screw Static Mixer with Different Structure

Gao Zhe, Zhao Feng, Yu Jianfeng, Cui Zhengwei

School of Mechanical Engineering, Jiangnan University, Key Laboratory of Advanced Food Manufacturing Equipment Technology of Jiangsu Province, Jiangsu Wuxi 214122, China

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Abstract Static screw mixer with variable pitch was used as a new desulfurization rig with high performance gas-liquid mass transfer efficiency. In order to optimize structural parameters of this mixer, a gas-liquid two-phase flow model was established in Barracuda^TM software trough Euler-Lagrangian method, and the effects of this mixers with different variable pitch coefficient m, length to diameter ratio l/d and rotation angle of flow path section φ on desulfurization efficiencies (DE) were simulated based on above method and SO₂ absorption rate equation. In condition of sufficient reactants available, the simulation results indicate that DE decreases with the increase of m, then tends to be flat when m≥0.50; DE increases with the increase of l/d, and tends to be flat when l/d=11, then rises again at l/d=14; DE increases with the increase of φ, then begins to be stable at φ near 630°. Based on above results, combined with the pressure drop and other indicators, the structural parameters (m=0.4,l/d=11,φ=630°) of this mixer were recommended. And experiments of this mixer with optimal structure was carried with the result of DE, 99.35% and outlet SO₂ concentration, 19.56 mg.m^-3, which exceeds the standard values of ultra-clean emission. Above results provide a basis for the design and manufacture of static screw desulfurization device at industrial-scale.

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	Gao Zhe
	Zhao Feng
	Yu Jianfeng
	Cui Zhengwei

Keywords： wet flue gas desulfurization； gas-liquid flow； numerical simulation； structural parameters； static screw mixer

Received 2019-05-15;

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Gao Zhe, Zhao Feng, Yu Jianfeng, Cui Zhengwei.Numerical Simulation of Wet Desulfurization by Screw Static Mixer with Different Structure[J] Chemcial Industry and Engineering, 2020,V37(3): 50-59

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