Shielding arrangement for the smelt spout area of a recovery boiler

Abstract

A smelt spout area of a recovery boiler. A bank of smelt spouts is connected to a lower part of the boiler for directing smelt from the boiler to a dissolving tank. A working area is in front of the bank of smelt spouts. A shielding wall is located in front of the bank of smelt spouts and arranged movable in relation to the bank of smelt spouts to separate the bank of smelt spouts from the working area and persons working on the working area.

1 - 15 . (canceled) 
     
     
         16 . A smelt spout area of a recovery boiler, comprising:
 a bank of smelt spouts connected to a lower part of the boiler for directing smelt from the boiler to a dissolving tank;   a working area in front of the bank of smelt spouts; and   a shielding wall located in front of the bank of smelt spouts and arranged movable in relation to the bank of smelt spouts to separate the bank of smelt spouts from the working area and persons working on the working area.   
     
     
         17 . The smelt spout area of a recovery boiler according to  claim 16 , wherein the shielding wall comprises a plurality of movable shielding units. 
     
     
         18 . The smelt spout area of a recovery boiler according to  claim 17 , wherein the shielding units are horizontally movable. 
     
     
         19 . The smelt spout area of a recovery boiler according to  claim 16 , wherein the shielding wall comprises a plurality of shielding units each comprising at least one of: a sliding door, a lattice door, a folding door, a roller shutter. 
     
     
         20 . The smelt spout area of a recovery boiler according to  claim 16 , wherein the shielding wall comprises at least one window for visually monitoring the bank of smelt spouts through the shielding wall. 
     
     
         21 . The smelt spout area of a recovery boiler according to  claim 16 , wherein the shielding wall comprises a plurality of shielding units arranged horizontally movable in relation to the bank of smelt spouts. 
     
     
         22 . The smelt spout area of a recovery boiler according to  claim 16 , wherein the shielding wall further comprises a plurality of adjacent rails at the bottom and top of the shielding wall and along which the plurality of shielding units slides such that, for opening and closing the shielding wall, a shielding unit on a rail can be placed behind another shielding unit on another rail. 
     
     
         23 . The smelt spout area of a recovery boiler according to  claim 16 , wherein the plurality of shielding units is configured to provide a closed shielding wall to prevent splashes, steams or pressure shocks of the bank of smelt spouts from reaching the working area. 
     
     
         24 . The smelt spout area of a recovery boiler according to  claim 23 , wherein the shielding units overlap each other. 
     
     
         25 . The smelt spout area of a recovery boiler according to  claim 23 , wherein the plurality of shielding units comprises:
 a first movable shielding unit separating the bank of smelt spouts from the working area;   a second movable shielding unit separating the bank of smelt spouts from the working area; and   a third movable shielding unit located between the first shielding unit and the second shielding unit, wherein the third movable shielding unit when closed separates the bank of smelt spouts and a smelt spout of the bank of smelt spouts from the working area, wherein the third movable shielding unit when closed further blocks an opening between the first shielding unit and the second shielding unit, and wherein the third movable shielding unit when opened enables performing service and maintenance operations related to said smelt spout.   
     
     
         26 . The smelt spout area of a recovery boiler according to  claim 25 , wherein the first movable shielding unit, the second movable shielding unit and the third movable shielding unit each is configured to be opened and closed by moving along a rail of a plurality of adjacent rails. 
     
     
         27 . The smelt spout area of a recovery boiler according to claim  10 , wherein the plurality of shielding units further comprises:
 a fourth movable shielding unit separating the bank of smelt spouts from the working area;   a fifth movable shielding unit separating the bank of smelt spouts from the working area;   wherein the first, second and third movable shielding units are located between the fourth shielding unit and the fifth shielding unit.   
     
     
         28 . The smelt spout area of a recovery boiler according to  claim 27 , wherein the first, second and third movable shielding units when closed further block an opening between the fourth shielding unit and the fifth shielding unit. 
     
     
         29 . The smelt spout area of a recovery boiler according to  claim 25 , wherein the first, second and third movable shielding units when closed are further configured to provide protection without gaps or breaks to prevent splashes of the bank of smelt spouts from reaching the working area. 
     
     
         30 . The smelt spout area of a recovery boiler according to  claim 16 , wherein the shielding wall comprises a plurality of movable shielding units arranged in a series, wherein the plurality of movable shielding units is configured to provide protection without gaps or breaks to prevent splashes of the bank of smelt spouts from reaching the working area. 
     
     
         31 . The smelt spout area of a recovery boiler according to  claim 16 , wherein the shielding wall defines a space around the recovery boiler, and wherein the shielding wall is further configured to provide solid protection without gaps or breaks around to prevent splashes of the bank of smelt spouts from reaching the working area. 
     
     
         32 . A shielding wall of a smelt spout area of a recovery boiler, the smelt spout area comprising a bank of smelt spouts connected to a lower part of the boiler for directing smelt from the boiler to a dissolving tank, a working area in front of the bank of smelt spouts, wherein the shielding wall is located in front of the bank of smelt spouts and arranged movable in relation to the bank of smelt spouts to separate the bank of smelt spouts from the working area and persons working on the working area. 
     
     
         33 . The shielding wall according to  claim 32 , wherein the shielding wall comprises a plurality of movable shielding units arranged in a series, wherein the plurality of movable shielding units is configured to provide protection without gaps or breaks to prevent splashes of the bank of smelt spouts from reaching the working area. 
     
     
         34 . The shielding wall according to  claim 32 , wherein the shielding wall comprises a plurality of shielding units arranged horizontally movable in relation to the bank of smelt spouts.