Computer controlled measurement of spontaneous combustion in coal stockpiles of the Western Lignite.pdf

JournalofUniversityofScienceandTechnologyBeijing Volume13,Number 2，Aerie2006,Page97 Computer controlled measurement of spontaneous combustion in coal stockpiles of the W estern Lignite Corporation，Turkey A．Hadi Ozdeniz and Cem Sensogut I1 Mining Engineering Department，Selcuk University，42079 Konya，Turkey 2 Mining Engineering Department，Dumlupinar University，43 100 Kutahya，Turkey (Received 2005—05-15) Mineral Abstract：The spontaneous combustion event in coal stockpiles is inevitable when appropriate environmental conditions are available． T11e obiective of a computerized measurement system is to measure temperature changes existing in a coal stockpile．In order to achieve this intention，山e electrical signal conversion of temperatures sensed by 2O temperature sensors placed in certain points inside the coal stockpile，the transfer of these electrical signals into computer media by using analogue—digital conversion unit after applying necessary filterization and upgrading processes and the record of these information into a database in particular time intervals are provided．Af_ terwards，the diagrams of these time—temperature data are ploted．W ith the help of these graphs，the competent company wil be able to examine the behavior of coal stockpiles in terms of spontaneous combustion and take necessary precautions against self-combustion beforehand． Key words：spontaneous combustion；coal stockpile；Westem Lignite Corporation；resistan ce temperature detector 1．IntrOductiOn The event beginning with oxygen absorption of coal from air，continuing with oxidation and probably end— ing with a flaming fire is called spontaneous combus— tion．The heat transfer caused by the effect of heat transportation and diffusion mechanisms turns into a chemical reaction after the adsorption of oxygen mo— lecules on to the surface of coal[1】．Knowing practi— cally the ability of coal to spontaneous combustion is of great importance in terms of taking necessary precau— tions． Although many