Enhancement of fine particle removal through flue gas cooling in a spray tower with packing materials

• Published in: Journal of hazardous materials Vol. 478; p. 135390
• Main Authors: Chen, Sheng, Zhao, Xuan, Xiao, Zuhang, Cheng, Mingkai, Zou, Renjie, Luo, Guangqian
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 05.10.2024
• Subjects: Aerosols; Fine particles; Low-temperature pollution control system; Stefan flow; Wet flue gas desulfurization; Aerosols; Low-temperature pollution control system; Fine particles; Stefan flow; Wet flue gas desulfurization
• ISSN: 0304-3894; 1873-3336; 1873-3336
• DOI: 10.1016/j.jhazmat.2024.135390

The efficient removal of fine particles from coal-fired flue gas poses challenges for conventional electrostatic precipitators and bag filters. Recently, a novel approach incorporating deep cooling of the flue gas has been proposed to enhance the removal of gaseous pollutants and particles. However, the achievable efficiency and underlying mechanisms of particle capture within the gas cooling system remain poorly understood. This study aims to elucidate the effectiveness of gas cooling in enhancing the removal of particles through a laboratory-scale spray tower equipped with packing materials. The results demonstrate a significant increase in particle removal efficiency, from 63.4 % to over 98 %, as the temperature of the spray liquid decreases from 20℃ to −20℃. Notably, this enhancement is particularly pronounced for particles sized 0.1–1 µm, with efficiency rising from approximately 40 % to 95 %, effectively eliminating the penetration window. Moreover, we find that the spray flow rate positively influences particle removal capability, while the height of the packing section exhibits an optimal value. Beyond this optimal height, particle removal performance may decline due to an inadequate liquid-to-packing ratio. To provide insight into the capture process, we introduce a single-droplet model demonstrating that particle capture is primarily enhanced through the augmented thermophoretic force. [Display omitted] •PM removal efficiency of 98 % is achieved by flue gas cooling.•The height of the packing section exhibits an optimal value for PM removal.•A single-droplet model is built to calculate forces on particles at various temperatures.•Industrial application of low-temperature pollution control system was introduced.