Method and Device for Generating Steam Suited to Oxycombustion

Abstract

The invention concerns a boiler adapted to oxycombustion ( 30 ) comprising a combustion chamber ( 31 ), a water heater ( 33 ) and a vaporizer ( 38, 40 ), wherein the combustion chamber includes at least partly the water heater ( 33 ). The invention also concerns an oxycombustion method with hot water generation, comprising heating cold water with the oxycombustion flame into a heated fluid. The inventive method is advantageously implemented in the inventive device.

1 . Boiler suited to oxycombustion comprising a combustion chamber, a water preheater and a vaporizer, in which the combustion chamber is at least partly made up of the water preheater.  
   
   
       2 . Boiler according to  claim 1 , in which the combustion chamber is completely made up of the preheater.  
   
   
       3 . Boiler according to  claim 1 , in which the preheater comprises a first bundle of independent tubes, according to a pitch of 2 to 3.  
   
   
       4 . Boiler according to  claim 1 , in which the preheater comprises a first bundle of tubes grooved internally.  
   
   
       5 . Boiler according to  claim 1 , in which the vaporizer is a radiation vaporizer.  
   
   
       6 . Boiler according to  claim 1 , in which the vaporizer comprises a radiation vaporizer and a convection vaporizer.  
   
   
       7 . Boiler according to  claim 1 , in which the vaporizer is a convection vaporizer.  
   
   
       8 . Boiler according to  claim 5 , in which the radiation vaporizers comprising a second bundle of tubes is arranged concentrically around the preheater comprising a first bundle of tubes, in the combustion chamber.  
   
   
       9 . Boiler according to  claim 1 , also comprising a water/steam separation flask, supplied with water by the preheater, supplying the vaporizer with water and supplied by the vaporizer with steam.  
   
   
       10 . Boiler according to  claim 1 , in which the water preheater is arranged inside the combustion chamber.  
   
   
       11 . Boiler according to  claim 1 , in which the water preheater operates counter-current to the combustion products of the combustion chamber.  
   
   
       12 . Boiler according to  claim 1 , also comprising a superheater.  
   
   
       13 . Method for generating hot water by oxycombustion, comprising the preheating of cold water by the oxycombustion flame to produce hot water.  
   
   
       14 . Method according to  claim 13 , also comprising the stage of vaporization of the preheated fluid produced.  
   
   
       15 . Method according to  claim 14 , in which the stage of vaporization of the preheated fluid is implemented by radiation.  
   
   
       16 . Method according to  claim 14 , in which the stage of vaporization of the preheated fluid is implemented by convection.  
   
   
       17 . Method according to  claim 14 , in which the stage of vaporization of the preheated fluid is implemented by radiation and by convection.  
   
   
       18 . Method according to  claim 13 , in which the stage of preheating the cold water by the oxycombustion flame is implemented counter-current.  
   
   
       19 . Method according to  claim 13 , in which the temperature of the oxycombustion flame is comprised between 2000 and 3300° C., preferably between 2500 and 3000° C.  
   
   
       20 . Method according to  claim 13 , in which the temperature of the cold water is comprised between 105 and 170° C. and its pressure between 8 and 500 bars.  
   
   
       21 . Method according to  claim 13 , in which the temperature of the preheated fluid is comprised between 170 and 600° C. and its pressure between 8 and 500 bars.  
   
   
       22 . Method according to  claim 13 , in which the preheated fluid comprises water and steam according to a water/steam proportion by mass varying from 100/0 to 50/50, preferably from 100/0 to 70/30, and advantageously from 95/5 to 80/20.  
   
   
       23 . Method according to  claim 14 , in which the temperature of the steam produced is comprised between 170 and 600° C. and its pressure between 8 and 500 bars.  
   
   
       24 . Method according to  claim 14 , also comprising a stage of superheating the steam produced.  
   
   
       25 . Method according to  claim 13 , in which the temperature of the flue gas after the water preheating stage is from 1200 to 600° C.  
   
   
       26 . Method according to  claim 13 , in which the temperature of the flue gas after the vaporization stage is from 250 to 150° C.  
   
   
       27 . Method according to  claim 13 , implemented in a device according to one of  claims 1  to  12 .