Abstract Spray Drying Absorber (SDA) has been widely used for large-scale desulfurization. However, it also has some limitations. For example, the liquid absorbent easily causes scaling, which impedes the contact between the serous fluid and the flue gas and reduces the chemical reaction rate and desulfurization efficiency. This paper establishes the mathematical and physical model of gas and liquid two-phase flow and droplet evaporation and heat transfer in rotary spray desulfurization tower. To study the accumulation and distribution of chemical reaction precipitates in the desulfurization tower and analyze the removal efficiency of sulfur dioxide (SO2) in different atomization diameters, this paper establishes a simulation model concerning the coupling of desulfurization reaction and flow field calculation based on the absorption and reaction mechanism of SO2. Baffle in different widths are set to optimize the internal flow field and balance the distribution of flue gas. By setting baffles of different widths to optimize the flow field in the tower and changing the distribution of flue gas, this model reduces the scaling while ensuring the desulfurization efficiency. The results of the simulation experiment have verified that the droplet with a diameter of 50 μm is the optimal option, which can effectively remove the scaling and ensure that the desulfurizing tower runs in high efficiency and stability. When the width of baffles is 2250 mm, the efficiency of desulfurization exceeds 95%, and the amount of scaling on the desulfurization tower main wall is controlled at the minimum level, which is the optimal option for production.

中文翻译：

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流动耦合化学反应模型优化SDA脱硫塔运行参数

摘要 喷雾干燥吸收塔(Spray Drying Absorber，SDA)已广泛应用于大规模脱硫。但是，它也有一些限制。例如，液体吸收剂容易结垢，阻碍浆液与烟气的接触，降低化学反应速率和脱硫效率。建立了旋喷脱硫塔气液两相流动及液滴蒸发传热的数学物理模型。研究脱硫塔中化学反应沉淀物的积累和分布，分析不同雾化直径下二氧化硫（SO2）的去除效率，本文基于SO2的吸收和反应机理，建立了脱硫反应与流场计算耦合的模拟模型。设置不同宽度的挡板，优化内部流场，平衡烟气分布。该机型通过设置不同宽度的挡板，优化塔内流场，改变烟气分布，在保证脱硫效率的同时减少结垢。模拟实验结果验证了直径为50 μm的液滴是最佳选择，可以有效去除结垢，保证脱硫塔高效稳定运行。当挡板宽度为2250mm时，脱硫效率超过95%，