Importance

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Abstract

The object of the invention is a method for enhancing the operation of a circulating mass reactor (1), which circulating mass reactor (1) comprises a fluidized-bed chamber (8) provided with a fluidized bed (108), means for separating fluidized material (80) from the flue gases, and a return conduit system (15, 16, 19) including at least one cooled return conduit (15, 16). In the method, for the combustion of fuel taking place in the circulation mass reactor (1) is provided a lower combustion chamber (89), which comprises a fluidized-bed chamber (8), and an upper combustion chamber (11) and a flow conduit (10) connecting them. The flow conduit (10), the means for separating the fluidized material (80) from the fuel gases and the return conduit system (15, 16, 19) are arranged to be located essentially between the lower combustion chamber (89) and the upper combustion chamber (11). The lower combustion chamber (89) and the upper combustion chamber (11) are dimensioned in such a way that the combustion of the fuel can be essentially completed before the discharge of the flue gases from the combustion chamber (11), whereupon the average delay time of the flue gases in the upper combustion chamber is most preferably 0.3-3.0 seconds. The fluidized material (80) is separated from the flue gases after the upper combustion chamber (11) and guided back to the fluidized-bed chamber (8) through cooled return conduits (15, 16) and an uncooled return conduit system (19) in the desired ratio.

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First Claim