Method and device for producing a gaseous medium comprising steam

Abstract

The invention relates to a method for producing a gaseous medium comprising steam, said steam being produced from a first fluid medium separated from the exhaust gas from combustion of a fuel in a steam generating step, said fuel being provided for burning for providing energy for heating said first fluid medium, comprising the steps of mixing the steam thus produced with exhaust gas from combustion of said fuel; and supplying at least one chemical substance different from air and water to said steam and exhaust gas mixture. The invention also relates to a device for producing a gaseous medium comprising steam.

1 . A method for producing a gaseous medium comprising steam, said steam being produced from a first fluid medium separated from the exhaust gas from combustion of a fuel in a steam generating step, said fuel being provided for burning for providing energy for heating said first fluid medium, comprising the step of:
 mixing the steam thus produced with exhaust gas from combustion of said fuel;   and comprising the step of:   supplying at least one chemical substance different from air and water to said steam and exhaust gas mixture.   
     
     
         2 . A method according to  claim 1 , wherein said at least one chemical substance is supplied to the steam produced in the steam generating step prior to the step of mixing the steam with the exhaust gas. 
     
     
         3 . A method according to  claim 1  or  2 , comprising the step of supplying a fluid medium to the steam produced in the steam generating step prior to the step of mixing the steam with the exhaust gas. 
     
     
         4 . A method according to  claim 3 , wherein said at least one chemical substance is supplied to the fluid medium prior to the step of supplying the fluid medium to the steam. 
     
     
         5 . A method according to  claim 1 , wherein the at least one chemical substance has properties suitable for extinguishing fires, such as oxygen removing properties. 
     
     
         6 . A method according to  claim 1 , wherein the at least one chemical substance has dissolving properties suitable for, for example cleaning and/or extraction of oil. 
     
     
         7 . A method according to  claim 3 , comprising the step of preheating the fluid medium separated from the steam generating step, energy for preheating the fluid medium being provided by said fuel. 
     
     
         8 . A method according to  claim 7 , wherein the fluid medium in the preheating step is the first fluid medium. 
     
     
         9 . A method according to  claim 7 , wherein said fluid medium from the preheating step is supplied to the steam produced in the steam generating step, preferably as a mist having a droplet size in the range of microns, preferably less than 10 microns. 
     
     
         10 . A method according to  claim 1 , wherein the steam in the steam generating step is provided under pressure. 
     
     
         11 . A method according to  claim 1 , comprising the step of burning said fuel in a combustion space. 
     
     
         12 . A method according to  claim 11 , comprising the step of introducing air into said combustion space. 
     
     
         13 . A method according to  claim 12 , comprising the step of preheating said air prior to introducing it into the combustion space, energy for preheating the air being provided by said fuel. 
     
     
         14 . A method according to  claim 13 , comprising the step of compressing said air prior to introducing said air into the combustion space. 
     
     
         15 . A method according to  claim 12 , wherein a fluid medium, not being a fuel, is supplied, preferably injected as a mist having a droplet size in the range of microns, preferably less than 10 microns, into the air in the air introduction step upstream of the combustion space, such that the fluid medium is mixed with the air. 
     
     
         16 . A method according to  claim 1 , wherein the fluid medium is water. 
     
     
         17 . A device for producing a gaseous medium comprising steam, said device comprising a combustion space and means for burning a fuel in said combustion space, said steam being arranged to be produced by means of a steam production means from a first fluid medium separated from the exhaust gas from combustion of said fuel, said fuel being provided for burning for providing energy for heating said first fluid medium, said device comprising a mixing space for mixing the steam thus produced with exhaust gas from combustion of said fuel and an outlet for discharging the mixture, and comprising chemical substance supply means for supplying at least one chemical substance different from air and water to said steam and exhaust gas mixture. 
     
     
         18 . A device according to  claim 17 , further comprising steam supply means for supplying steam to the mixing space arranged upstream of said mixing space, wherein said chemical substance is arranged to be supplied from said chemical substance supply means to said steam supply means. 
     
     
         19 . A device according to  claim 17 , further comprising a fluid supply means for supplying a fluid to the steam supply means. 
     
     
         20 . A device according to  claim 19 , wherein said chemical substance is arranged to be supplied from said chemical substance supply means to said fluid supply means. 
     
     
         21 . A device according to  claim 17 , wherein the at least one chemical substance has properties suitable for extinguishing fires, such as oxygen removing properties. 
     
     
         22 . A device according to  claim 17 , wherein the at least one chemical substance has dissolving properties suitable for, for example cleaning and/or extraction of oil. 
     
     
         23 . A device according to  claim 19 , further comprising preheating means for preheating a fluid medium separately from the steam production means, energy for preheating the fluid medium being provided by said fuel. 
     
     
         24 . A device according to  claim 23 , wherein the fluid medium arranged to be preheated is the first fluid medium. 
     
     
         25 . A device according to  claim 23 , wherein said preheating means comprises passing means for passing the fluid medium for preheating. 
     
     
         26 . A device according to  claim 23 , wherein the steam production means comprises a fluid transport means for transporting the first fluid medium, wherein the preheated fluid medium is arranged to be passed from the passing means into the fluid transport means. 
     
     
         27 . A device according to  claim 23 , wherein the preheated fluid medium is arranged to be supplied from the passing means to and introduced into the steam supply means, preferably as a mist having a droplet size in the range of microns, preferably less than 10 microns. 
     
     
         28 . A device according to  claim 23 , wherein heat for preheating said fluid medium is provided from said combustion space. 
     
     
         29 . A device according to  claim 25 , wherein said passing means comprises a jacket of the combustion space. 
     
     
         30 . A device according to  claim 18 , wherein the steam supply means further comprises a pressure chamber for pressurising the steam, arranged upstream of the mixing chamber. 
     
     
         31 . A device according to  claim 17 , further comprising means for introducing air into the combustion space. 
     
     
         32 . A device according to  claim 31 , further comprising means for preheating the air prior to being introduced into the combustion space, energy for preheating the air being provided by said fuel. 
     
     
         33 . A device according to  claim 31 , further comprising means for compressing the air, said means being arranged upstream of said combustion space. 
     
     
         34 . A device according to  claim 33 , further comprising turbine means arranged to drive said compressor means by means of a portion of the exhaust gas and air. 
     
     
         35 . A device according to  claim 17 , further comprising a constriction means, for example a convergent nozzle, arranged to accelerate the exhaust gas and air towards the outlet. 
     
     
         36 . A device according to  claim 31 , wherein a fluid medium not being a fuel, preferably water, is arranged to be introduced into the air upstream of the combustion space, preferably as a mist having a droplet size in the range of microns, such that the fluid is mixed with the air. 
     
     
         37 . A device according to  claim 17 , wherein the fluid medium is water.