旋转喷雾干燥技术作为脱硫废水零排放处理技术，具有废水适应性强、能耗低、投资低等优点，应用前景广阔。以某600 MW火力发电站机组脱硫废水喷雾干燥塔为研究对象，建立了雾化蒸发模型，开展喷雾干燥塔中导流板角度对脱硫废水雾化蒸发性能影响的数值模拟研究。结果表明，干燥塔内气体分配器将烟气分为流经内、外流道的2股烟气，内流道烟气首先与蒸发脱硫废水雾化后的液滴接触，直接影响脱硫废水的蒸发性能，外流道烟气可抑制内流道烟气产生的涡旋效应，避免雾化液滴喷溅至干燥塔壁面引起腐蚀。在雾化器下方形成低温区域，该区域内烟气与液滴的相对速度及温差较大，是雾化液滴蒸发的主要区域。内流道内导流板偏转角度对废水雾化蒸发性能的影响较外导流板明显；内流道内导流板角度越小，外流道内导流板角度越大，进入内流道烟气越多，脱硫废水蒸发时间与蒸发距离越短，其蒸发性能改善越显著。综合考虑，实际运行中建议内流道导流板角度设置为0，外流道导流板角度设置为45°。

Rotary spray drying technology, as a zero-discharge treatment technology for desulfurization wastewater, has the advantages of good adaptability to wastewater, low energy consumption, low investment, and broad application prospects. A 600 MW thermal power plant unit desulfurization wastewater spray drying tower was used as the research object, an atomization evaporation model was established, and the numerical simulation study on the influence of the deflector angle in the spray drying tower on the atomization and evaporation performance of desulfurization wastewater was carried out. The results show that the gas distributor in the drying tower divides the flue gas into two flue gas flows through the inner and outer channels. The flue gas in the inner channel first contacts with the droplets after atomization of the evaporative desulfurization wastewater, which directly affects the evaporation of the desulfurization wastewater. The flue gas in the outer flow channel can inhibit the vortex effect generated by the flue gas in the inner flow channel, and prevent the spray of atomized droplets on the wall surface of the drying tower from causing corrosion. A low temperature area is formed below the atomizer, where the relative velocity and temperature difference between the flue gas and the droplets are relatively large, which is the main area for atomization droplet evaporation. The influence of the deflection angle of the inner deflector in the inner flow channel on the atomization and evaporation performance of waste water is more obvious than that of the outer deflector. The smaller the angle of the inner guide plate in the inner flow channel is, the larger the angle of the inner guide plate in the outer flow channel is, the more flue gas that enters the inner flow channel is, the shorter the evaporation time and evaporation distance of desulfurization wastewater is, and the more significant the improvement of its evaporation performance is. Comprehensive consideration, in actual operation, it is recommended to set the angle of the deflectors of the inner flow channel to 0°, and the angle of the deflectors of the outer flow channel to be set to 45°.

0 引言

1 研究对象

2 计算模型及工况设置

3 结果与讨论

   3.1 网格无关性测试与模拟验证

   3.2 内导流板角度对雾化蒸发性能影响

   3.3 外导流板角度对雾化蒸发性能影响

4 结论