Recovery boiler plant and a method in a recovery boiler

Abstract

A recovery boiler plant, which comprises a recovery boiler, wherein in the first part ( 1 a ) flue gases travel in a first direction (F 1 ). The furnace also comprises a second part ( 1 b ), where the flue gases proceed in a second direction (F 2 ), which second direction differs from the first direction (F 1 ). In addition, the invention relates to a method in a recovery boiler.

1 . A recovery boiler plant, which comprises a recovery boiler, wherein in a first part of a furnace flue gases travel in a first direction, wherein the furnace also comprises a second part, where the flue gases travel in a second direction, which second direction differs from the first direction, and in addition the recovery boiler plant comprises a superheater area, which is located horizontally next to the second part of the furnace. 
   
   
       2 . The recovery boiler plant according to  claim 1 , wherein the first direction is upwards and the second direction is downwards. 
   
   
       3 . The recovery boiler plant according to  claim 1 , wherein the length of the first part of the furnace is 60 to 140% of the length of the second part of the furnace. 
   
   
       4 . The recovery boiler plant according to  claim 3 , wherein the first part of the furnace and the second part of the furnace are equally long. 
   
   
       5 . The recovery boiler plant according to  claim 1 , wherein the recovery boiler plant comprises a frame, from which the first part and the second part of the furnace are suspended. 
   
   
       6 . The recovery boiler plant according to  claim 4 , wherein the first part of the furnace and the second part of the furnace comprise means for removing smelt. 
   
   
       7 . The recovery boiler plant according to  claim 1 , wherein the second part of the furnace comprises means for controlling the corrosiveness of the emissions and flue gases. 
   
   
       8 . A method in a recovery boiler, wherein flue gases in a furnace are brought to a first direction in a first part of the furnace, wherein flue gases are brought in the furnace also to a second direction in a second part of the furnace, which second direction differs from the first direction, and the flue gases are brought from the second part of the furnace to a superheater area, which is located horizontally next to the second part of the furnace. 
   
   
       9 . The method according to  claim 8 , wherein in the second part of the furnace additives are supplied to the flue gases in order to control emissions and corrosiveness. 
   
   
       10 . The method according to  claim 8 , wherein the first direction is upwards and the second direction is downwards.