Method for erecting a boiler

Abstract

The method for erecting a boiler includes erecting a main structure comprising at least a cavity, assembling on the ground at least a roof for the main structure, assembling on the ground at least a module having at least heat exchanging surfaces, lifting the roof up to an intermediate altitude within the cavity, the intermediate altitude being an altitude between a ground level and a top of the main structure in correspondence of the cavity, connecting the module to the roof at the ground level, and further lifting the roof and connecting the roof to the main structure.

1 . A method for erecting a boiler comprising
 erecting a main structure comprising at least a cavity,   assembling on the ground at least a roof for the main structure,   assembling on the ground at least a module comprising at least heat exchanging surfaces,   lifting the roof up to an intermediate altitude within the cavity, the intermediate altitude being an altitude between a ground level and a top of the main structure in correspondence of the cavity,   connecting the module to the roof at the ground level, further lifting the roof and connecting the roof to the main structure.   
     
     
         2 . The method of  claim 1 , wherein the modules further comprising headers connected to the heat exchanging surfaces. 
     
     
         3 . The method of  claim 1 , wherein after connecting the module to the roof, the roof is further lifted at least once up to an intermediate altitude within the cavity and at least an additional module is connected to at least a module already connected to the roof. 
     
     
         4 . The method of  claim 1 , wherein assembling modules comprising heat exchanging surfaces is made while erecting the main structure. 
     
     
         5 . The method of  claim 1 , wherein the modules comprising heat exchanging surfaces are lifted by strand jacks. 
     
     
         6 . The method of  claim 1 , wherein the heat exchanging surfaces comprise side tubed walls with at least backstays or sections of side tubed walls with at least backstays. 
     
     
         7 . The method of  claim 1 , wherein the heat exchanging surfaces comprise internal heat exchanging surfaces or sections of internal heat exchanging surfaces. 
     
     
         8 . The method of  claim 7 , wherein the internal heat exchanging surfaces comprise a superheater and/or a reheater and/or an economizer. 
     
     
         9 . The method of  claim 1 , wherein a silo and/or an air heater and/or scr and or a cyclone are assembled while lifting the at least a module. 
     
     
         10 . The method of  claim 1 , wherein the boiler is a two pass boiler or a tower boiler or a circulating fluidized bed boiler. 
     
     
         11 . The method of  claim 1 , wherein a silo and/or an air heater and/or a scr and/or a cyclone are assembled while erecting the main structure and/or while assembling on the ground at least a module and/or while lifting and connecting the modules. 
     
     
         12 . A method for erecting a two-pass boiler comprising erecting a main structure having four cavities,
 assembling on the ground two roofs for the main structure,   assembling on the ground at least a module comprising side tubed walls with at least backstays or sections of side tubed walls with at least backstays and/or   assembling on the ground at least a module comprising internal heat exchanging surfaces or sections of internal heat exchanging surfaces,   in a first cavity, lifting a roof up to an intermediate altitude within the first cavity, the intermediate altitude being an altitude between a ground level and a top of the main structure in correspondence of the first cavity,   lifting a roof up to an intermediate altitude within a second cavity, the intermediate altitude being an altitude between a ground level and a top of the main structure in correspondence of the second cavity,   in the first cavity, connecting a module to the roof and lifting the roof,   in the second cavity, connecting a module to the roof and lifting the roof,   in the first cavity, further lifting the roof and connecting the roof to the main structure,   in the second cavity, further lifting the roof and connecting the roof to the main structure.   
     
     
         13 . The method of  claim 12 , wherein the modules further comprise headers connected to the heat exchanging surfaces. 
     
     
         14 . The method of  claim 12 , wherein after connecting at least a module to at least a roof, that roof is further lifted at least once up to an intermediate altitude within the cavity and at least an additional module is connected to at least a module already connected to the roof. 
     
     
         15 . The method of  claim 12 , wherein assembling modules comprising heat exchanging surfaces is made while erecting the main structure. 
     
     
         16 . The method of  claim 12 , wherein the modules comprising heat exchanging surfaces are lifted by strand jacks. 
     
     
         17 . The method of  claim 12 , wherein the heat exchanging surfaces comprise side tubed walls with at least backstays or sections of side tubed walls with at least backstays. 
     
     
         18 . The method of  claim 12 , wherein the heat exchanging surfaces comprise internal heat exchanging surfaces or sections of internal heat exchanging surfaces. 
     
     
         19 . The method of  claim 18 , wherein the internal heat exchanging surfaces comprise a superheater and/or a reheater and/or an economizer. 
     
     
         20 . The method of  claim 11 , wherein a silo and/or an air heater and/or a scr and/or a cyclone are assembled while erecting the main structure and/or while assembling on the ground at least a module and/or while lifting and connecting the modules.