| 摘要 |
An otherwise conventional recovery boiler for burning black liquor requires less capital investment and takes up less space by constructing the economizers in a particular manner. At least first and second economizers are provided for preheating feed water utilizing flue gas from combustion of the black liquor. The economizers are positioned substantially side-by-side, in the width dimension of the recovery boiler furnace, and connected in such a way that flue gas leaving the first economizer passes in a transverse horizontal direction and then through an intra-economizer flow channel into the second economizer. A boiler bank may be connected between the superheater section of the recovery boiler and the first economizer, and any number of economizers can be utilized.
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