State Key Laboratory of Clean Energy Utilization, Zhejiang University
The Institute for Energy Engineering, China Jiliang University

针对土壤热脱附装置存在着严重的扬尘问题,将声波团聚联合喷雾的方法应用于热脱附装置的除尘,研究了声频、粉尘初始浓度、声压级和喷雾流量等对除尘效果的影响(粉尘的平均粒径小于 10 μm)。 实验发现,在声频为 1 400 Hz、喷雾浓度为 1.0 L·m-3的条件下,团聚室的除尘效率在 60 s 内达到 98%;声压级从 145 dB 提高至 153 dB 后,除尘效率提高了 38%;SEM 结果表明,声波处理后的颗粒被碾碎并团聚;添加喷雾可以提高除尘效率,但不同的喷雾浓度对最终的除尘效率影响不大,施加喷雾后的最佳声频仍为 1 400 Hz;粉尘和喷雾的初始浓度越大,团聚前期的除尘速率和最后的除尘效率越大,当喷雾浓度为 2.0 L·m-3时比没有喷雾时的除尘效率提高了44%,说明声波团聚对高浓度气溶胶的使用效果更好,研究结果可为热脱附装置除尘技术的研发提供参考。

In order to solve the serious dusting problem for soil thermal desorption device, the method ofacoustic agglomeration combined spray was applied to the dust removal of the thermal desorption device.The effects of sound frequency, initial dust concentration, sound pressure level and spray flow rate onthe dust removal efficiency (average particle size of dust less than 10 μm) were studied. The experi⁃mental results showed that under the condition of sound frequency of 1 400 Hz and spray concentrationof 1.0 L·m-3, the dust removal efficiency of the agglomeration chamber reached 98% within 60 s.When the sound pressure level was increased from 145 dB to 153 dB, the dust removal efficiency is in⁃creased by 38%. SEM results showed that the particles were crushed and aggregated after acoustic wavetreatment. Adding spray could improve the dust removal efficiency, but the effect of spray concentrationon final dust removal efficiency was not significant. The optimal sound frequency after spraying was1 400 Hz. The higher initial concentration of dust and spray could lead to the higher dust removal rateand the final dust removal efficiency in the early stage of agglomeration. When the spray concentrationwas 2.0 L·m-3, the dust removal efficiency was 44% higher than that without spray, indicating thatthe acoustic wave agglomeration had a better effect on the use of high concentration aerosol. The resultsof this paper could offer useful information in the investigation and development of dust removal technol⁃ogy of thermal desorption device.

国家自然科学基金项目(51876197);国家重点研发计划项目(2018YFC1802105)

0 引 言
1 实验方法
1.1 实验装置和除尘效率的计算
1.2 粉尘样品的粒径分布
2 实验结果与分析
2.1 声频对除尘效果的影响
2.2 声压级对除尘效果的影响
2.3 粉尘初始浓度对除尘效果的影响
2.4 声波团聚对颗粒微观结构的影响
2.5 喷雾对除尘效果的影响
3 结 论

钟雲濠, 吴昂键, 顾海林, 等. 基于声波团聚的热脱附装置除尘的关键影响因素研究[J]. 能源环境保护,2023, 37(3): 128-135.

ZHONG Yunhao, WU Angjian, GU Hailin, et al. Experimental studies on key parameters of the dust removal ofsoil thermal desorption device using acoustic agglomeration[J]. Energy Environmental Protection, 2023, 37(3):128-135.