热风分布器结构对脱硫废水旋转喷雾蒸发特性影响的数值模拟

doi:10.16085/j.issn.1000-6613.2020-0867

摘要/Abstract

摘要：

针对脱硫废水旋转喷雾蒸发过程，建立了气液两相流动及传热传质模型，并利用该模型对某电厂300MW机组的脱硫废水蒸发过程进行了模拟，研究了热风分布器中导流板的角度和数量对干燥塔内流场、废水雾滴运动与蒸发的影响。结果表明：外导流板角度对喷雾干燥塔内流场影响比内导流板大，随着外导流板角度的增加，热烟气进入喷雾干燥塔的旋转作用更加明显，外导流板角度为32°时烟气旋流作用最好；随着内导流板角度的增加，液滴轴向运动最远距离减少，同时内导流板角度的改变对喷雾干燥塔内液滴完全蒸发时间的影响大于外导流板，内导流板角度为0°时液滴蒸发时间最短；内导流板数量对喷雾干燥塔内流场、液滴的运动和蒸发影响较小，随着内导流板数量的增加，干燥塔内流场、液滴运动距离和完全蒸发时间趋于稳定，综合考虑烟气导流与风压损失，建议内导流板数量取为24片。

关键词: 脱硫废水, 喷雾蒸发, 热风分布器, 导流板, 流场

Abstract:

A two-phase flow model for gas and liquid including the heat and mass transfer between them was established, and the desulfurization wastewater spray evaporation process in a 300MW power plant was studied by simulation. The influence of angle and number of deflectors on the flow field in drying tower and the movement and evaporation of wastewater droplets was investigated. The results showed that the influence of the angle of outer deflectors on the flow field in the drying tower is greater than that of the inner deflectors. With the increase of the angle of outer deflectors, the rotation effect of flue gas entering the spray drying tower is more obvious, and the rotation effect of flue gas is the best when it is 32°. With the increase of the angle of inner deflectors, the maximum distance of droplets axial movement decreases. Meanwhile, the change of the angle of inner deflectors has a greater influence on the complete evaporation time of the droplets in drying tower than that of the outer deflectors, and the evaporation time of droplets is the shortest when the angle of inner deflectors is 0°. The number of inner deflectors has little influence on the flow field, droplet movement or evaporation in the drying tower. With the increase of the number of inner deflectors, the flow field, droplets movement distance and complete evaporation time in the drying tower tend to be stable. Considering the flue gas diversion and flue gas pressure loss, it is suggested that the number of inner diversions should be 24.

Key words: desulfurization wastewater, spray evaporation, hot air distributor, deflector, flow field

中图分类号:

李飞, 陈海杰, 孙宗康, 谷小兵, 白玉勇, 高飞, 杨林军. 热风分布器结构对脱硫废水旋转喷雾蒸发特性影响的数值模拟[J]. 化工进展, 2020, 39(S2): 385-392.

Fei LI, Haijie CHEN, Zongkang SUN, Xiaobing GU, Yuyong BAI, Fei GAO, Linjun YANG. Numerical evaporation characteristics of desulfurization wastewater by rotating spray with different hot air distributor structure[J]. Chemical Industry and Engineering Progress, 2020, 39(S2): 385-392.

图/表 12

图1 脱硫废水旋转喷雾蒸发干燥塔及热风分布器模型

表1 气液相参数及边界条件

参数	内容
气相
烟气速度/m·s^-1	13
烟气温度/K	628
烟气入口条件	速度入口
烟气出口条件	压力出口
壁面条件	标准壁面函数
喷嘴流量/kg·s^-1	1.6
液相
液滴出口速度/m·s^-1	150
液滴碰壁条件	反射
液滴粒径/μm	50

图2 不同外导流板角度下热风分布器出口烟气流线图

图3 不同外导流板角度下干燥塔内轴心速度沿轴向变化

图4 不同内导流板角度下热风分布器出口烟气流线图

图5 不同内导流板角度下干燥塔内轴心速度沿轴向变化

图6 导流板角度对液滴轴向运动距离的影响

图7 导流板角度对液滴完全蒸发时间的影响

图8 不同内导流板数量下热风分布器出口烟气流线图

图9 不同内导流板数量下干燥塔内轴心速度沿轴向变化

图10 内导流板数量对液滴轴向运动距离的影响

图11 内导流板数量对液滴完全蒸发时间的影响

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