# Behavior Characteristics of Hazardous Gas and Scattering Coal Dust in Coal Storage Sheds
## 1 Introduction
For larger areas of application, blocking the flow of oxygen is more effective. [PERSON] et al. [10] presented a system that classifies coal by its spontaneous combustion capability, based on the fuzzy Delphi analytic hierarchy process. Based on these figures, the natural ignition propensity of coal was classified, and the initial verification was conducted at the Eastern Alborz coal mines in Iran. [PERSON] et al. [11] studied prevention technology based on the theory of the spontaneous combustion of coal and oxidation inhibition. The study results demonstrate the effectiveness of the method of spraying a mixture of inhibitors and water, and the process of inhibiting spontaneous ignition by injecting the mixture. Regarding coal dust, [PERSON] et al. [12] studied a method to reduce scattered dust in coal storage using a polyvinyl alcohol surfactant. Their research reveals that polyvinyl alcohol surfactants reduce the scattering amount of carbon dioxide by more than 35% on average, regardless of the low carbonization period. Studies to suppress spontaneous coal combustion and dust scattering are continuously being conducted. However, if natural ignition expands and it is impossible to extinguish and block the spread, it is likely to expand into serious fires. Accordingly, research on the aspect of the indoor coal storage system is also continuously conducted. Regarding predicting the spontaneous ignition temperature of coal, [PERSON] et al. [13] have established an evaluation method for monitoring spontaneous coal combustion. The study predicted the coal temperature with 97% accuracy, based on the carbon monoxide/dioxide ratio and fire coefficient. [PERSON] et al. [14] studied the dust suppression effect of porous wind tunnel materials using wind tunnel experiments and computational fluid dynamics (CFD) to reduce coal dust in the coal yard. The primary data for reducing dust in coal storage was presented based on the ventilation and dust suppression rates. [PERSON] et al. [15] evaluated the ventilation performance according to the shape and opening conditions of the dome-type coal storage shed. According to the study, the rise-span ratio affects the wind pressure difference, and the effective ventilation rate of the opening is increased by 9% to 42%. It also provided helpful information for ventilation control based on the design variables. In addition, various studies have demonstrated the effectiveness of natural ventilation and mechanical ventilation using CFD [16; 17; 18; 19]. As mentioned, research on the spontaneous combustion characteristics of coal and the indoor coal storage system is continuously being conducted. However, no studies have considered the ventilation system analysis of the shed-type indoor coal storage and the working environment of field workers inside an indoor storage facility. Therefore, this study has analyzed the ventilation characteristics of shed-type coal storage for a coal-fired power plant using CFD. Moreover, the carbon monoxide concentration features in the coal pile were analyzed when spontaneous combustion occurred. Synthesizing the derived results confirmed the areas where the risk of carbon monoxide exposure for field workers was expected in the event of spontaneous coal combustion in indoor coal storage.