Oblon, McClelland, Maier & Neustadt, L.L.P.
Method and apparatus of controlling oxygen supply in oxyfuel combustion boiler
Provided are a method and an apparatus of controlling an oxygen supply in an oxyfuel combustion boiler capable of attaining stable oxyfuel combustion even when properties of coal are changed. A boiler-brought-in oxygen density is obtained when coal with a fuel ratio measured by fuel measuring means 39 is burned stably with oxygen in a boiler 4 so that a relationship between the fuel ratio and/or carbon content of the coal and the boiler-brought-in oxygen density is obtained and inputted in advance into the controller. When the coal is changed to the new kind of coal, a total amount of gases recirculated is regulated such that a boiler-brought-in oxygen density becomes accordance with a fuel ratio and/or a carbon content which is measured in advance for the new kind of coal.
IHI Corporation ELECTRIC POWER DEVELOPMENT CO., LTD.
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Terutoshi Shuuhei Toshihiko Shuzo
Uchida Terushita Yamada Watanabe