Steam boiler equipped with cooling device

Abstract

The steam boiler has a circulation system for boiler water that has water pipes arranged to circulate boiler water and steam through the water pipes with a cooled device arranged to cool a selected, exposed part of the steam boiler. The cooled device has an outer tube and an inner tube arranged in the outer tube. The outer tube, at an upper end thereof, has an open connection to one of the water pipes in which water pipe a flow is established.

1 . A steam boiler, comprising:
 a furnace;   a circulation system for boiler water, the circulation system having a water pipe connected thereto and adapted to circulate boiler water and steam through the water pipe in a circuit; the circulation system being in operative engagement with the furnace;   a cooled device in operative engagement with the water pipe, the cooled device having an outer tube and an inner tube arranged in the outer tube, the outer tube, at an upper end thereof, having an open connection defined therein connected to the water pipe;   the outer tube having a sealed lower end;   the inner tube having an upper open end connected to the water pipe and a lower open end at the sealed lower end; and   the cooled device extending at least partially in a vertical direction downwardly from the upper end of the outer tube.   
     
     
         2 . The steam boiler according to  claim 1  wherein the cooled device is in operative engagement with an element to cool the element. 
     
     
         3 . The steam boiler according to  claim 2  wherein the element consists of a wall in the steam boiler and the cooled device is arranged inside the wall. 
     
     
         4 . The steam boiler according to  claim 2  wherein the element consists of a thermocouple. 
     
     
         5 . The steam boiler according to  claim 2  wherein the element consists of a through tube that extends through the water pipe and through the inner tube and connects to the outer tube. 
     
     
         6 . The steam boiler according to  claim 1  wherein the steam boiler comprises a cyclone for separating ash from hot flue gases, the cyclone has an outlet tube for the hot flue gases and the cooled device is arranged to cool the outlet tube. 
     
     
         7 . The steam boiler according to  claim 6  wherein the outlet tube consists of a number of cooled devices each cooled device comprises an outer tube and an inner tube. 
     
     
         8 . The steam boiler according to  claim 6  wherein the steam boiler has a plurality of water pipes and at least some of the water pipes are inside walls of the cyclone and extend in a vertical direction from a lower part of the cyclone to a higher part of the cyclone and some of the water pipes which extend inside the walls of the cyclone are connected to the cooled devices by the outer tube and the inner tube. 
     
     
         9 . The steam boiler according to  claim 1  wherein the steam boiler has walls that form a flue gas duct and the cooled device constitutes a holder for an element that is suspended in the flue gas duct. 
     
     
         10 . The steam boiler according to  claim 1  wherein the steam boiler has walls that form a flue gas duct and the cooled device, together with a number of similar cooled devices, form a partition wall that separates two parts of a flue gas duct from each other. 
     
     
         11 . The steam boiler according to  claim 1  wherein the steam boiler has walls that form a flue gas duct and the cooled device is arranged in the flue gas duct as a separation beam and is provided with outer rails. 
     
     
         12 . The steam boiler according to  claim 1  wherein the upper open end of the inner tube is funnel-shaped. 
     
     
         13 . The steam boiler according to  claim 1  wherein the inner tube, at the upper end thereof, has a mouth that is at a slant to a longitudinal axis of the inner tube. 
     
     
         14 . The steam boiler according to  claim 1  wherein an area is disposed at a lower side of the water pipe that has been expanded to meet the outer tube. 
     
     
         15 . The steam boiler according to  claim 1  wherein a lid is arranged at the upper end of the outer tube to cover part of a gap area between the outer tube and the inner tube. 
     
     
         16 . The steam boiler according to  claim 1  wherein the inner tube, at an upper end thereof, is inclined towards a wall of the outer tube.