Analysis of white smoke elimination and waste heat recovery in a heat exchange system using cooling dehumidification mixing technology

After wet desulfurization, saturated wet flue gas discharges directly into the atmosphere, creating "white smoke." This smoke contributes to visual environmental pollution, increasing water content and causing waste heat loss in the flue gas. To investigate the heat exchange process in winter conditions, researchers performed an experimental study on a heat exchange system, focusing on the cooling dehumidification and mixing of white smoke. The study aims to minimize white smoke pollution following wet desulfurization by analyzing the heat exchange system. By adjusting the supply air fan frequency, the system significantly reduces outlet temperature and absolute humidity. The optimal performance occurs at a frequency of 60 Hz, leading to a 27 % reduction in temperature, an 84 % drop in humidity, and a 42 % increase in cooling water heat recovery. Experimental and numerical data show consistency within a 10 % error margin. Visualization of the white smoke indicates that the heat exchange system effectively mitigates visual pollution linked to white smoke while also aiding in resource recovery. The results from this research provide valuable insights for engineering applications focused on white smoke reduction.