Abstract
This study has comprehensively analyzed the ventilation system of an indoor coal storage shed using computational fluid dynamics (CFD). In addition, the effects of the plan to improve the ventilation system were investigated by synthesizing the results. First, the velocity of inlet wind entering through the natural ventilation system was measured. Then, the concentration of carbon monoxide inside the coal storage shed was measured at the spontaneous combustion of coal. The boundary conditions were set using the measurement results. The characteristics of carbon monoxide concentration, ventilation volume, and behavior of scattering dust were analyzed. According to the CFD analysis results, the upper recirculation strength increased as the flow rate of external air increased. The flow-stagnation area occurred on the center wall. In particular, the concentration of carbon monoxide was high in the flow-stagnation area. When the inflow velocity was 2.0 m/s, a risk of 30 ppm or more occurred in the area near the second-floor workspace and central retaining wall. When ventilation dropped sharply, coal dust emissions decreased to 14.5%. Thus, ventilation must be secured by installing a natural ventilation system, in case spontaneous ignition occurs in many cells or the ventilation sharply decreases. Finally, in order to improve the ventilation system, the effect on the additional installation of natural ventilation and the use of mobile blowers was analyzed. Finally, in order to improve the ventilation system, the effect on the additional installation of natural ventilation and the use of mobile blowers was analyzed. As a result of the analysis, we concluded that using a mobile blower is more effective than a method of additionally installing a natural ventilation device. Carbon monoxide may be locally diluted, and ventilation volume additionally secured.
Highlights
Governments worldwide have been pushing for energy transformation to cope with severe climate change
According to the 2019 statistics released by the US Energy Information Administration, South Korea ranked fifth among liquefied natural gas, coal, and petroleum fuel importers in the world, and ninth in energy consumption
The most important aspect was the location of spontaneous ignition; the point where spontaneous ignition occurred in the coal storage shed was measured using thermal images
Summary
Governments worldwide have been pushing for energy transformation to cope with severe climate change. Fossil-fuel use is decreasing, and eco-friendly energy use is increasing [1]. Changing the fossil-fuel-oriented energy industry in a short time is expensive. This section introduces the latest technologies related to indoor air quality (IAQ). Behrouz Pirouz et al [20] analyzed the effects of indoor airflow patterns and exits in HVAC systems. CFD was used to improve the HVAC design in the study. It analyzed blind spots where residents were placed and dead zones with poor ventilation. This paper comprehensively analyzes the natural ventilation performance of indoor coal fields and presents improvement measures by synthesizing the results. The latest technology and research for improving ventilation systems and indoor air quality (IAQ) are introduced
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