Abstract
This study presents thermodynamic comparison of a steam, hot water and hot air production system consuming Soma and Afsin lignites under stoichiometric combustion conditions. For this purpose, using the results from stoichiometric combustion reaction and proximate-ultimate analyses of the lignite samples, energy and exergy analyses are performed. Moreover, the concept and capacity of steam (424 K, 5 bar), hot water (363 K) and hot air (573 K) production system are chosen in accordance with a tea factory. Consequently, in case of stoichiometric combustion of the same amount of Afsin and Soma lignites, it is observed that the amount of steam from Soma lignite combustion is approximately three times more than that of Afsin lignite combustion. Additionally, energy and exergy efficiencies of the system using Afsin lignite are calculated to be 66% and 19%, respectively while those of system using Soma lignite are estimated to be 73% and 24%, respectively.
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