【摘要】 为了解决火电厂使用的折流板除雾器对小粒径雾滴脱除效果差的问题,提出一种新型的涡流除雾器,通过在除雾器中产生涡来使流场复杂,从而增加对小粒径雾滴的脱除效果。通过数值模拟方法研究涡流除雾器和折流板除雾器,并且通过实验对数值模拟进行验证。研究结果表明:当流速为3~7 m/s时,涡流除雾器的总除雾效率比折流板除雾器的总除雾效率大10.8%~29.8%;当流速为3~7 m/s时,涡流除雾器对于20μm雾滴的除雾效率便能达到90%以上;涡流除雾器对小粒径雾滴的脱除效果比折流板除雾器好,如当粒径为10μm时,涡流除雾器的效率比折流板除雾器大17.8%~18.2%;涡流除雾器的压降要比折流板除雾器大,当流速为3 m/s时,差值为193 Pa,而后差值随着流速的增大而增大。更多还原

【Abstract】 Demisting efficiency of baffle plate demister for small droplets was low. To solve this problem, a new kind of demister, i.e. vortex, demister was proposed. The flow field of vortex demister was complicated because of vortexes, which will increase the removal efficiency of small droplets. Vortex demister and baffle plate demister were studied by numerical simulation. And some experiments were done to show the validity of the simulation. The results show that the demisting efficiency of vortex demister is 10.8%-29.8% higher than that of baffle plate demister when the gas flow rate is between 3 and 7 m/s. The removal efficiency of 20 μm droplet of vortex demister is higher than 90% when the gas flow rate is between 3 and 7 m/s. And the removal efficiency of vortex demister is higher than that of baffle plate demister when droplets were small. For example, the removal efficiency of vortex demister is 17.8%-18.2% higher than that of baffle plate demister when the diameter of droplets is 10 μm. And the pressure drop of vortex demister is higher than that of baffle demister. When the gas flow rate is 3 m/s, the difference is 193 Pa, and the difference will increase with gas flow velocity increasing.更多还原