A novel method to suppress spontaneous ignition of coal stockpiles in a coal storage yard

Effects of wind barrier design and closed coal storage on spontaneous ignition of coal stockpiles

“…To simulate transient behaviors of flow and heating processes, the unsteady two-dimensional governing equations for them are solved as done in the previous work (Kim and Sohn, 2012). Chemical reaction rate with Arrhenius form, coal porosity, forced and natural convective flows both within coal stockpiles and in surrounding air are adopted to consider the physical and chemical processes essential in simulating coal spontaneous ignition.…”

“…Accordingly, a large number of experiments are difficult to be realized in practice. As an alternative to experimental approach, CFD simulations were proposed with simplified models and can be found in lots of literatures (Akgun and Essenhigh, 2001;Jones and Vais, 1991;Kim and Sohn, 2012;Park et al, 2009;Taraba et al, 2014;Salinger et al, 1994;Zarrouk et al, 2006;Xia et al, 2014;Yang et al, 2014;Zhu et al, 2013). Spontaneous ignition is affected by various parameters such as shape and dimensional size of a coal stockpile, porosity of a coal stockpile, external flow or wind, initial temperature of coal, moisture content, and so on.…”

“…Forced and natural convections of air within the coal stockpiles have been considered in nearly all of previous numerical works. Additionally, several works employed air flow surrounding the piles (Akgun and Essenhigh, 2001;Kim and Sohn, 2012;Salinger et al, 1994). The effect of solar radiation on coal ignition was studied (Kraj ciov a et al, 2004).…”

“…Furthermore, new methods to suppress spontaneous ignition were proposed and verified in a quantitative manner by Kim and Sohn (2012). For example, internal walls, forced air blowing from the bottom of a stockpile, and a dual wind barrier were proposed and tested to retard spontaneous ignition and the expected additional delay of each method was calculated to be about 10e30 days.…”

Assessment of Self-Heating Susceptibility of Indian Coal Seams – A Neural Network Approach

“…Ozdeniz (2010) determined spontaneous combustion in an industrial-scale coal stockpile. Kim and Sohn (2012) proposed new methods to suppress spontaneous ignition of coal stockpiles in a coal storage yard through numerical simulation. Low-temperature oxidation of four different-rank Turkish coals was studied at 40, 60 and 90°C in order to assess the effects of temperature, particle size, coal petrography, and coal rank by monitoring CO 2 and CO formation rates and calculated CO/CO 2 ratios (Baris et al, 2012).…”