Claims
- 1. Mixing apparatus for mixing black liquid formed from cellulose production with ash formed from flue gases generated during combustion of black liquor to form a mixture of ash and black liquor, the mixing apparatus comprising:
- a walled vessel having a side wall and a bottom wall defining an internal volume;
- at least one inlet in said walled vessel for supplying black liquor to said internal volume;
- at least one inlet in said walled vessel for supplying ash to said internal volume;
- at least one outlet for removing a mixture of ash and black liquor from said internal volume;
- a vertical shaft rotatably mounted within said internal volume;
- a motor constructed and arranged to rotate said vertical shaft in relation to said walled vessel;
- at least one propeller constructed and arranged on an upper portion of said vertical shaft such that when said vertical shaft rotates said propeller generates a first circular flow of black liquor in which said black liquor flows downward within an inner portion of said internal volume and flows upward in an outer portion of said internal volume, said propeller having a diameter less than an inner diameter of said walled vessel;
- a draft tube connected to said walled vessel surrounding said propeller for facilitating the flow the black liquor downward in said inner portion of said internal volume;
- a disk constructed and arranged on a lower portion of said vertical shaft, wherein during rotation of said vertical shaft said downward flow of black liquor contacts said disc and is directed outward and then upward in said outer portion of said internal volume; and
- at least one rotating baffle constructed and arranged on a bottom side of said disk such that when said vertical shaft is rotated said at least one rotating baffle rotates and thrusts black liquor and solid particles in a direction away from said shaft and towards said walled vessel and generates a second circular flow of black liquor in which said black liquor flows downward at a periphery of said internal volume and upwards in an inner portion of said internal volume, a bottom of said at least one rotating baffle being spaced from said bottom wall of said walled vessel to avoid friction between said at least one rotating baffle and said walled vessel, and said bottom wall being sloped towards a location under said at least one rotating baffle whereby solid particles flow from an outer periphery of said bottom wall towards said location under said at least one rotating baffle, wherein said at least one rotating baffle comprises a substantially flat paddle.
- 2. Mixing apparatus for mixing black liquid formed from cellulose production with ash formed from flue gases generated during combustion of black liquor to form a mixture of ash and black liquor, the mixing apparatus comprising:
- a walled vessel having a side wall and a bottom wall defining an internal volume;
- at least one inlet in said walled vessel for supplying black liquor to said internal volume;
- at least one inlet in said walled vessel for supplying ash to said internal volume;
- at least one outlet for removing a mixture of ash and black liquor from said internal volume;
- a vertical shaft rotatably mounted within said internal volume;
- a motor constructed and arranged to rotate said vertical shaft in relation to said walled vessel;
- at least one propeller constructed and arranged on an upper portion of said vertical shaft such that when said vertical shaft rotates said propeller generates a first circular flow of black liquor in which said black liquor flows downward within an inner portion of said internal volume and flows upward in an outer portion of said internal volume, said propeller having a diameter less than an inner diameter of said walled vessel;
- a draft tube connected to said walled vessel surrounding said propeller for facilitating the flow the black liquor downward in said inner portion of said internal volume;
- a disk constructed and arranged on a lower portion of said vertical shaft, wherein during rotation of said vertical shaft said downward flow of black liquor contacts said disc and is directed outward and then upward in said outer portion of said internal volume;
- at least one rotating baffle constructed and arranged on a bottom side of said disk such that when said vertical shaft is rotated said at least one rotating baffle rotates and thrusts black liquor and solid particles in a direction away from said shaft and towards said walled vessel and generates a second circular flow of black liquor in which said black liquor flows downward at a periphery of said internal volume and upwards in an inner portion of said internal volume, a bottom of said at least one rotating baffle being spaced from said bottom wall of said walled vessel to avoid friction between said at least one rotating baffle and said walled vessel, and said bottom wall being sloped towards a location under said at least one rotating baffle whereby solid particles flow from an outer periphery of said bottom wall towards said location under said at least one rotating baffle; and
- at least one stationary vertical guide baffle constructed and arranged along said side wall for guiding said upward flow of black liquor.
- 3. Mixing apparatus for mixing black liquid formed from cellulose production with ash formed from flue gases generated during combustion of black liquor to form a mixture of ash and black liquor, the mixing apparatus comprising:
- a walled vessel having a side wall and a bottom wall defining an internal volume;
- at least one inlet in said walled vessel for supplying black liquor to said internal volume;
- at least one inlet in said walled vessel for supplying ash to said internal volume;
- at least one outlet for removing a mixture of ash and black liquor from said internal volume;
- a vertical shaft rotatably mounted within said internal volume;
- a motor constructed and arranged to rotate said vertical shaft in relation to said walled vessel;
- at least one propeller constructed and arranged on an upper portion of said vertical shaft such that when said vertical shaft rotates said propeller generates a first circular flow of black liquor in which said black liquor flows downward within an inner portion of said internal volume and flows upward in an outer portion of said internal volume, said propeller having a diameter less than an inner diameter of said walled vessel;
- a draft tube connected to said walled vessel surrounding said propeller for facilitating the flow the black liquor downward in said inner portion of said internal volume;
- a disk constructed and arranged on a lower portion of said vertical shaft, wherein during rotation of said vertical shaft said downward flow of black liquor contacts said disc and is directed outward and then upward in said outer portion of said internal volume; and
- at least one rotating baffle constructed and arranged on a bottom side of said disk such that when said vertical shaft is rotated said at least one rotating baffle rotates and thrusts black liquor and solid particles in a direction away from said shaft and towards said walled vessel and generates a second circular flow of black liquor in which said black liquor flows downward at a periphery of said internal volume and upwards in an inner portion of said internal volume, a bottom of said at least one rotating baffle being spaced from said bottom wall of said walled vessel to avoid friction between said at least one rotating baffle and said walled vessel, and said bottom wall being sloped towards a location under said at least one rotating baffle whereby solid particles flow from an outer periphery of said bottom wall towards said location under said at least one rotating baffle, wherein said outlet for said product comprises a vertical holed plate along said side wall.
- 4. Mixing apparatus for mixing black liquid formed from cellulose production with ash formed from flue gases generated during combustion of black liquor to form a mixture of ash and black liquor, the mixing apparatus comprising:
- a walled vessel having a side wall and a bottom wall defining an internal volume;
- at least one inlet in said walled vessel for supplying black liquor to said internal volume;
- at least one inlet in said walled vessel for supplying ash to said internal volume;
- at least one outlet for removing a mixture of ash and black liquor from said internal volume;
- a vertical shaft rotatably mounted within said internal volume;
- a motor constructed and arranged to rotate said vertical shaft in relation to said walled vessel;
- at least one propeller constructed and arranged on an upper portion of said vertical shaft such that when said vertical shaft rotates said propeller generates a first circular flow of black liquor in which said black liquor flows downward within an inner portion of said internal volume and flows upward in an outer portion of said internal volume, said propeller having a diameter less than an inner diameter of said walled vessel;
- a draft tube connected to said walled vessel surrounding said propeller for facilitating the flow the black liquor downward in said inner portion of said internal volume;
- a disk constructed and arranged on a lower portion of said vertical shaft, wherein during rotation of said vertical shaft said downward flow of black liquor contacts said disc and is directed outward and then upward in said outer portion of said internal volume; and
- at least one rotating baffle constructed and arranged on a bottom side of said disk such that when said vertical shaft is rotated said at least one rotating baffle rotates and thrusts black liquor and solid particles in a direction away from said shaft and towards said walled vessel and generates a second circular flow of black liquor in which said black liquor flows downward at a periphery of said internal volume and upwards in an inner portion of said internal volume, a bottom of said at least one rotating baffle being spaced from said bottom wall of said walled vessel to avoid friction between said at least one rotating baffle and said walled vessel, and said bottom wall being sloped towards a location under said at least one rotating baffle whereby solid particles flow from an outer periphery of said bottom wall towards said location under said at least one rotating baffle.
- 5. Mixing apparatus according to claim 4, wherein said propeller is surrounded by a nozzle to facilitate the downward flow of black liquor in said inner portion of said internal volume, and a top of said nozzle being below the surface of the black liquor or a side opening provided in said nozzle so that a portion of said black liquor flowing upward in said outer portion of said internal volume can flow into said nozzle.
- 6. Mixing apparatus according to claim 4, wherein said mixing apparatus comprises four rotating baffles.
- 7. Mixing apparatus according to claim 4, further comprising at least one stationary baffle mounted to said bottom wall outside of a maximum radius defined by turning said at least one rotating baffle.
- 8. Mixing apparatus according to claim 7, wherein said at least one stationary baffle projects upward to at least said bottom of said at least one rotating baffle, wherein said solid particles thrust outward by said at least one rotating baffle contact said stationary baffle and are broken into smaller particles.
- 9. Mixing apparatus according to claim 8, wherein said at least one stationary baffle comprises four stationary baffles substantially equally spaced around said maximum radius of said rotating baffle.
- 10. Mixing apparatus according to claim 4, wherein a distance between said stationary baffle and said rotating baffle is about 0.005 meter to about 0.5 meter.
- 11. Mixing apparatus according to claim 4, wherein said at least one rotating baffle comprises four rotating baffles mounted on said bottom side of said disc which are substantially equally spaced apart.
- 12. Mixing apparatus according to claim 4, wherein a minimum distance between said bottom wall and said at least one rotating baffle is about 0.02 meter to about 1 meter.
- 13. Mixing apparatus according to claim 4, wherein a minimum distance between said bottom wall and said at least one rotating baffle is about 0.2 meter to about 0.75 meter.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9600100 |
Jan 1996 |
SEX |
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Parent Case Info
This application is a continuation-in-part of PCT/SE97/00016, filed on Jan. 9, 1997, and claims priority to Swedish Patent Application No. 9600100-3, filed on Jan. 12, 1996, the complete disclosures of which are incorporated herein by reference.
US Referenced Citations (18)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0 394 007 A2 |
Oct 1990 |
EPX |
41 32 154 A1 |
Apr 1993 |
DEX |
2 161 394 |
Jan 1986 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
PCTSE9700016 |
Jan 1997 |
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