Coal deactivation apparatus

A coal inactivation system configured to inactivate coal by heating the coal with a treatment gas containing oxygen, the coal inactivation system comprising:

• a treatment apparatus body, to inside of which the coal is supplied;
• treatment gas-supply means configured to supply the treatment gas to the inside of the treatment apparatus body;
• treatment gas-oxygen concentration-adjustment means configured to adjust an oxygen concentration Oc in the treatment gas;
• treatment gas-temperature-adjustment means configured to adjust a temperature Tc of the treatment gas;
• fractionation means configured to fractionate a portion of the coal inactivated in the treatment apparatus body;
• an evaluation apparatus body, to inside of which a sample of the coal fractionated by the fractionation means is supplied;
• test gas-supply means configured to supply a test gas having an evaluation temperature Tt to the inside of the evaluation apparatus body;
• test gas-temperature-detection means configured to detect a temperature Te of the test gas having heated the sample in the evaluation apparatus body;
• and
• control means configured to, based on information from the test gas-temperature-detection means,
• when the temperature Te of the test gas is equal to or higher than a higher limit value Teh, judge whether or not the oxygen concentration Oc of the treatment gas is equal to or higher than a higher limit value Oh,
• if the oxygen concentration Oc of the treatment gas is lower than the higher limit value Oh, control the treatment gas-oxygen concentration-adjustment means in such a manner as to increase the oxygen concentration Oc of the treatment gas by a given value Ofu, and
• if the oxygen concentration Oc of the treatment gas is equal to or higher than the higher limit value Oh, further judge whether or not the temperature Tc of the treatment gas is equal to or higher than a higher limit value Th, and control the treatment gas-temperature-adjustment means in such a manner as to increase the temperature Tc of the treatment gas by a given value Tfu if the temperature Tc of the treatment gas is lower than the higher limit value Th, and
• when the temperature Te of the test gas is equal to or lower than a lower limit value Tel, judge whether or not the temperature Tc of the treatment gas is equal to or lower than a lower limit value Tl,
• if the temperature Tc of the treatment gas is higher than the lower limit value Tl, control the treatment gas-temperature-adjustment means in such a manner as to decrease the temperature Tc of the treatment gas by a given value Tfd,
• if the temperature Tc of the treatment gas is equal to or lower than the lower limit value Tl, further judge whether or not the oxygen concentration Oc of the treatment gas is equal to or lower than a lower limit value Ol, and control the treatment gas-oxygen concentration-adjustment means in such a manner as to decrease the oxygen concentration Oc of the treatment gas by a given value Ofd if the oxygen concentration Oc of the treatment gas is higher than the lower limit value Ol.