不同结构静态螺旋混合器强化湿法脱硫数值模拟

摘要变螺距静态螺旋混合器可作为一种新型高性能气液传质脱硫装置，为优化其结构参数，利用欧拉-拉格朗日方法，在Barracuda^TM软件中建立了气液两相流动模型，并根据上述模型及二氧化硫吸收速率方程，分别模拟了静态螺旋混合器在不同变螺距系数m、长径比l/d、流道截面回转角φ下SO₂出口浓度和脱硫率的变化规律。结果表明：在反应物充足的情况下，脱硫率随m的增大而降低，并于m≥0.5时趋于稳定；脱硫率随l/d的增大而提高，并于l/d=11~13时趋于稳定，l/d=14时又出现上升；脱硫率随φ的增大而提高，并于φ≥720°趋于稳定。根据上述规律，结合压降等指标，给出了各结构参数的建议值：m=0.45，l/d=11，φ=630°，并在建议结构参数下进行了脱硫试验，SO₂出口浓度为19.56 mg.m^-3，脱硫率达99.35%，达到超净排放标准。为今后工业规模静态螺旋混合脱硫装置的设计与制造提供了依据。

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	高哲
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关键词：湿法烟气脱硫气液两相流数值模拟结构参数静态螺旋混合器

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.

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

Received 2019-05-15;

Fund:国家自然科学基金项目（21606109）；江苏省研究生科研与实践创新计划项目（SJCX19_0786）；国家食品科学与工程一流学科建设项目（JUFSTR20180205）。

Corresponding Authors: 崔政伟,E-mail:cuizhengwei@jiangnan.edu.cn。 Email: cuizhengwei@jiangnan.edu.cn

About author: 高哲(1995-),男,硕士研究生,研究方向:轻工机械。

引用本文:

高哲, 赵枫, 俞建峰, 崔政伟.不同结构静态螺旋混合器强化湿法脱硫数值模拟[J]. 化学工业与工程, 2020,37(3): 50-59

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, 2020,37(3): 50-59

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