By Simeon Oka
Information the improvement of fluidized mattress combustion boilers, in addition to the elemental procedures in boiler furnaces and coal combustion in fluidized beds. Explores purposes within the research of coal suitability for fluidized mattress combustion, in addition to damaging subject emissions from FBC boilers.
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Extra info for Fluidized Bed Combustion
5 m2 of the furnace cross section . When fuel is spread on the bed surface fewer feed points are needed—a feeder per 5–15 m2. 5–2 MWth, it is obvious that boilers with high unit capacity need a large number of feeding points. ), 130 MWe of power, has 12 coal spreaders, that is one for every 14 m2 . This large number of feeding points is the main reason why first generation FBC boilers are not being built for higher unit capacity (higher than 50–100 MWth). The only exception is a first generation FBC boiler built with the capacity customary for utility electric power plants (100 MWe).
At this time, initial designs for boilers in the 400–500 MWe capacity range had already been proposed [29, 42, 43]. In CFBC boilers, combustion has been separated from heat transfer by adding heat exchangers in a back pass. In the furnace there are no in-bed heat transfer surfaces. A change of solid particle concentration in the furnace, Copyright © 2004 by Marcel Dekker, Inc. Development of Fluidized Bed Combustion Boilers 25 which is simply realized by changing recirculation rate of solids in the primary circuit, significantly alters the heat transfer coefficient to the watertube walls, as well as the amount of heat removed from the furnace.
Although manufacturers tend to call this type of construction second generation FBC, it is really only a variation of first generation FBC boilers, a series of technical improvements has been tested in practice and on pilot plants in order to extend the range of turndown ratio for first generation FBC boilers. Change of the bed temperature, change of the bed height (by Copyright © 2004 by Marcel Dekker, Inc. Development of Fluidized Bed Combustion Boilers – – 21 changing fluidization velocity or by removing the inert material from the bed), division of the furnace into several sections and bed slumping in some sections are examples of these attempts [33, 40].