Method, device and system for enhancing combustion of solid objects

1. A system for enhancing burning of a solid object in a combustion process, the system ( 100 ) comprising:

one or more incineration devices ( 102 ) for burning a solid object ( 101 ),

at least one sonic device ( 301 ),

characterized in that

said at least one sonic device ( 301 ) is an high intensity ultrasound device adapted to, during use, to apply high intensity ultrasound to said solid object ( 101 ) thereby removing ash from said solid object ( 101 ) and increasing turbulence around the solid object ( 101 ) and thereby increasing the speed of the burning of said solid object ( 101 ), where a sound pressure level of said high intensity ultrasound is at least approximately 140 dB.

2. A system according to claim 1 , wherein

said solid object ( 101 ) is located on a grate or an other separator ( 103 ), during combustion,

at least one of said incineration devices ( 102 ) is located under said grate or said other separator ( 103 ), and

at least one of said at least one sonic device ( 301 ) is located under said grate or other separator ( 103 ) and applies high intensity ultrasound toward said solid object ( 101 ) through said grate or said other separator ( 103 ).

3. A system according to claim 1 , wherein said combustion process takes place in a plant comprising a primary air distribution chamber distributing air to said at least one incineration devices ( 102 ) and wherein at least one of said sonic devices ( 301 ) is located in the primary air distribution chamber of said plant.

4. A system according to claim 1 , wherein at least one of said sonic devices ( 301 ) are alternating switched on and off during the combustion process thereby reducing power consumption.

5. A system according to claim 1 , wherein said combustion process takes place in a plant comprising air injection means for introducing secondary air to the combustion process and wherein at least one of said sonic devices ( 301 ) is located in the air injection means.

6. A system according to claim 1 , wherein at least one of said at least one sonic devices ( 301 ) is a Hartmann type gas-jet acoustic wave generator that comprises:

an outer part ( 305 ) and an inner part ( 306 ) defining a passage ( 303 ),

an opening ( 302 ), and

a cavity ( 304 ) provided in the inner part ( 306 )

where said sonic device ( 301 ) is adapted to receive a pressurized gas and pass the pressurized gas to said opening ( 302 ), from which the pressurized gas is discharged in a jet towards the cavity ( 304 ).

7. A system according to claim 1 , at least one of said at least one sonic device ( 301 ) is at least partly driven by steam.

8. A system according to claim 1 , wherein the sound pressure level of said high intensity ultrasound is

selected from the interval between approximately 140 dB to approximately 160 dB, or

above approximately 160 dB.

9. A method of enhancing burning of a solid object in a combustion process, the method comprising

burning a solid object ( 101 ) by one or more incineration devices ( 102 ),

characterized in that said method further comprises

applying, during use, high intensity ultrasound from at least one sonic device ( 301 ) to said solid object ( 101 ) thereby removing ash from said solid object ( 101 ) and increasing turbulence around the solid object ( 101 ) and thereby increasing the speed of the burning of said solid object ( 101 ), where a sound pressure level of said high intensity ultrasound is at least approximately 140 dB.

10. A method according to claim 9 , wherein said method further comprises

applying high intensity ultrasound toward said solid object ( 101 ) through a grate or other separator ( 103 ), where said solid object ( 101 ) is located on said grate or other separator ( 103 ) during combustion and where at least one of said incineration devices ( 102 ) and at least one of said at least one sonic device ( 301 ) are located under said grate or said other separator ( 103 ).

11. A method according to claim 9 , wherein said combustion process takes place in a plant comprising a primary air distribution chamber distributing air to said at least one incineration devices ( 102 ) and wherein at least one of said sonic devices ( 301 ) is located in the primary air distribution chamber of said plant.

12. A method according to claim 9 , wherein said method comprises alternating switching at least one of said sonic devices ( 301 ) on and off during the combustion process thereby reducing power consumption.

13. A method according to claim 9 , wherein said combustion process takes place in a plant comprising air injection means for introducing secondary air to the combustion process and wherein at least one of said sonic devices ( 301 ) is located in the air injection means.

14. A method according to claim 9 , wherein at least one of said at least one sonic devices ( 301 ) is a Hartmann type gas-jet acoustic wave generator that comprises:

an outer part ( 305 ) and an inner part ( 306 ) defining a passage ( 303 ),

an opening ( 302 ), and

a cavity ( 304 ) provided in the inner part ( 306 )

where said sonic device ( 301 ) receives a pressurized gas and passes the pressurized gas to said opening ( 302 ), from which the pressurized gas is discharged in a jet towards the cavity ( 304 ).

15. A method according to claim 9 , wherein said method comprises driving at least one of said at least one sonic device ( 301 ) at least partly by steam.

16. A method according to claim 9 , wherein the sound pressure level of said high intensity ultrasound is

selected from the interval between approximately 140 dB to approximately 160 dB, or

above approximately 160 dB.

17. A sonic device ( 301 ) being a Hartmann type gas jet acoustic wave generator comprising

an outer part ( 305 ) and an inner part ( 306 ) defining a passage ( 303 ),

an opening ( 302 ), and

a cavity ( 304 ) provided in the inner part ( 306 ),

where said sonic device ( 301 ) is adapted to receive a pressurized gas and pass the pressurized gas to said opening ( 302 ), from which the pressurized gas is discharged in a jet towards the cavity ( 304 ) thereby generating high intensity ultrasound, characterized in that said sonic device ( 301 ) is adapted to, during use, to apply high intensity ultrasound to a solid object ( 101 ) thereby removing ash from said solid object ( 101 ) and increasing turbulence around the solid object ( 101 ) and thereby increasing the speed of the burning of said solid object ( 101 ), where a sound pressure level of said high intensity ultrasound is at least approximately 140 dB.