Fluid fuel burning device

Abstract

A fluid fuel burning device, comprising: an elongated combustion compartment comprising side walls, where distal end is open allowing fluid communication from inside the combustion compartment and out of compartment; an insulation layer arranged on the inner surface of the side walls and/or on an inner surface of the proximal end of the compartment, preventing heat inside the compartment from radiating away from the compartment from the side walls and/or the proximal end, air flow means for providing a current of air, a fuel nozzle for aerification of the fluid fuel inside the combustion compartment, fuel feeding means for feeding fluid fuel to the fuel nozzle, pressure providing means for applying pressure to the fluid fuel fed via the fuel feeding means, and where the insulation layer comprises a heat absorbent layer that is of a temperature retentive material and radiating heat from the absorbent layer into the combustion compartment.

1 . A fluid fuel burning device, comprising:
 an elongated combustion compartment comprising side walls having an outer surface and an inner surface defining the radial periphery of the combustion compartment having a central axis extending from a proximal end to a distal end of the compartment in the longitudinal direction, where distal end is open allowing fluid communication from inside the combustion compartment and out of the compartment;   airflow means for providing a current of air in a direction from the proximal end of the combustion compartment and towards the distal end in a direction parallel to the central axis of the compartment;   a fuel nozzle for aerification of fluid fuel inside the combustion compartment,   fuel feeding means for feeding fluid fuel to the fuel nozzle,   pressure providing means for applying pressure to the fluid fuel fed via the fuel feeding means;   a thermal insulation layer arranged radially between the central axis of the combustion compartment and the side walls of the compartment, reducing the heat transfer in a direction from the central axis of the combustion compartment towards the side walls;   characterized in that the fluid fuel burning device further comprises   a thermal absorbent layer arranged radially between the central axis of the combustion compartment and the insulation layer, allowing thermal energy generated within the combustion compartment to be absorbed and radiated back into the combustion compartment in a direction towards the central axis when thermal equilibrium has been reached between the combustion compartment and the thermal absorbent layer.   
     
     
         2 . A device according to  claim 1 , wherein the pressure provided means are configured to apply a pressure of between 1-5 bar, or more specifically between 1.1 and 3 bar or more specifically between 1.5-2 bar. 
     
     
         3 . A device according to any of the preceding claims, wherein the elongated combustion compartment has an inner surface area having a first cross sectional diameter and a second inner surface area that has a second cross sectional diametre, where the first cross sectional diametre is smaller than the second cross sectional diametre. 
     
     
         4 . A device according to any of the preceding claims, wherein the elongated combustion compartment has a first right circular cylindrical volume having a first cross sectional diametre and a second right circular cylindrical volume having a second first cross sectional diametre that is smaller than the first cross sectional diametre. 
     
     
         5 . A device according to any of the preceding claims, where the inner end proximal end section of the combustion compartment comprises the fuel nozzle and an outlet for the fan ensuring that the air supply envelops the fuel nozzle for feeding oxygen in a direction parallel to the longitudinal axis of the compartment. 
     
     
         6 . A device according to any of the preceding claims, wherein the fuel feeding means comprise a circulating fuel arrangement, the arrangement comprising a fuel tank, an output conduit from fuel tank, an input conduit into fuel tank, a driving arrangement for circulating the fluid, a regulator valve for regulating the pressure inside the circulating fuel arrangement, and a fluid input means for incrementing the amount of fluid inside the circulating fuel arrangement. 
     
     
         7 . A device according to any of the preceding claims, where the device comprises an oxygen measuring means and/or a pressure measuring means arranged to measure the oxygen and/or pressure of the exhaust gas of the device. 
     
     
         8 . A device according to any of the preceding claims, wherein the pressure and/or the oxygen measuring means has at least part control of the regulator valve. 
     
     
         9 . A device according to any of the preceding claims, wherein the pressure and/or the oxygen measuring means controls the magnitude of air provided by the air flow means. 
     
     
         10 . A device according to any of the preceding claims, wherein the fluid input comprises a water input means for introducing liquid water into the closed circulating fuel arrangement. 
     
     
         11 . A device according to any of the preceding claims, wherein the thermal absorption layer is a layer of a material that has a high thermal conductivity, or approximately between 1.2-3.05 W/m·K ASTM C 182 at 800° C., more specifically the thermal conductivity may be between 1.3 and 2.5 W/m·K ASTM C 182 at 800° C., even more specifically between 1.5 and 2.4 W/m·K ASTM C 182 at 800° C. 
     
     
         12 . A device according to any of the preceding claims, wherein the thermal insulation layer is a layer of a material that has a low thermal conductivity, or approximately between 0.1-0.5 W/m·K ASTM C 182 at 800° C., more specifically the thermal conductivity may be between 0.1 and 0.35 W/m·K ASTM C 182 at 800° C., even more specifically between 0.15 and 0.24 W/m·K ASTM C 182 at 800° C. 
     
     
         13 . A method of regulating a fluid fuel flow in a device for burning fluid fuel, comprising the steps of:
 providing an elongated combustion compartment having a proximal closed end and a distal open end,   providing an air flow in a direction from the proximal closed end to the distal open end,   providing an aerated fuel flow inside the elongated combustion compartment,   igniting the aerated fuel inside the elongated combustion compartment,   measuring the oxygen content of the exhaust gasses for the apparatus,   adjusting the air flow based on the oxygen content and/or the pressure of the exhaust gasses,   adjusting the fuel flow based on the oxygen content and/or the pressure of the exhaust gasses.   
     
     
         14 . A method according to  claim 13 , wherein the air flow is increased or decreased if the oxygen content drops below or exceeds a first predefined percentage oxygen level, respectively. 
     
     
         15 . A method according to any of  claims 13 - 14 , wherein the method further comprises a step of measuring the pressure of the of the exhaust gasses for the apparatus. 
     
     
         16 . A method according to any of  claims 13 - 15 , wherein the air flow is decreased if the pressure of the exhaust gasses exceeds a first predefined pressure level. 
     
     
         17 . A method according to any of  claims 13 - 16 , wherein the air flow is increased if the pressure of the exhaust gasses drops below a predefined pressure level.