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A study on the temperature profile and heat transfer coefficients in underground coal gasification cavities
, Daggupati S., Mandapati R.N., Mahajani S., Pal A.K., Sharma R.K.
Published in
2010
Volume: 3
   
Pages: 2243 - 2256
Abstract
Underground Coal Gasification (UCG) is the potential in-situ method of converting un-mined coal into combustible syngas which can be served as a fuel for power generation, industrial heating or as chemical feedstock. UCG process provides a source of clean energy with minimal greenhouse gas emissions, when it is compared with the conventional coal mining and gasification. As gasification proceeds underground cavity is formed as the coal burns, and its shape and size changes with time as the coal is consumed. The shape and rate of growth of this cavity will strongly depend on the temperature profile inside the cavity. As underground coal gasification cavities are of irregular three-dimensional shapes, computational fluid dynamics studies (CFD) are essential in order to understand the temperature distribution inside the UCG cavities. A complete knowledge of the transport phenomena inside the UCG cavity is important for both cavity growth modeling and process modeling as it determines the quality and rate of production of the product gas. In the present study, CFD simulations are performed to study the convective heat transfer characteristics of UCG cavities at specified boundary conditions. By changing the feed flow rate, surface heat transfer coefficients are obtained over a wide range of Reynolds number for four different cavity sizes. The methodology of determining heat transfer coefficient through FLUENT is validated by performing simulations for a circular pipe over a wide range of Reynolds number. The predicted heat transfer coefficients are consistent with the correlations.
About the journal
Journal27th Annual International Pittsburgh Coal Conference 2010, PCC 2010
Open AccessNo