PURPOSE: To dispense with cooling water for cooling medium or sea water, and to reduce desulfurization cost, by using the air for cooling an adsorbent regenerated by heating desorption, and this heated air having recovered the waste heat for the combustion of a boiler.
CONSTITUTION: The waste combustion gas is introduced into an adsorbing tower 101 from a boiler 100, SOx is adsorbed from the waste gas, denitrated and freed of dust with a dust collector 102, and exhausted through a duct 11. An adsorbent having adsorbed SOx is led through a pipe 12 to a heat desorption regenerating tower 103, and the desorbed gas is sent through a pipe 13 to a sulfur recovering apparatus 104. The regenerated adsorbent is led through a pipe 16 to a cooling tower 106 to cool it by heat exchange with the air sent through a pipe 17. The heated air is joined with the gas fed through a duct 4 as combustion air to the boiler 100. The cooled adsorbent is classified with a classifier 107, returned to the adsorbing tower 101 for recirculation use. The classified pulverized adsorbent is sent through a pipe 20 to a pipe 3 as a fuel for the boiler 100 to mix it with coal fuel.
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ARASHI NORIO
HISHINUMA TAKAO
NISHIMURA TSUKASA
BABCOCK HITACHI KK