Claims
- 1. A method of supplying coal and sulphur absorbent to a combustor with combustion of coal occurring in a fluidized bed of particulate material, comprising the steps of:
- a) dividing crushed coal into a fine and a coarse fraction;
- b) supplying the fine coal fraction to at least one of a dust separator and a scrubber;
- c) separating the fine coal fraction from the transport gas and thereafter supplying said fine fraction to a container for preparation of a paste;
- d) preparing a paste of the fine fraction by the addition of a liquid while leaving the coarse fraction in a dry state;
- e) pumping said paste into the fluidizing bed of the combustor through at least one first nozzle; and
- f) transporting the coarse coal fraction to a pressure increasing device, prior to supplying said coarse fraction to the fluidized bed; and
- g) supplying the coarse coal fraction and crushed absorbent to the combustor in said dry state.
- 2. A method of supplying coal and sulphur absorbent to a combustor with combustion of coal occurring in a fluidized bed of particulate material, comprising the steps of:
- a) dividing crushed coal into a fine and a coarse fraction;
- b) preparing a paste of the fine fraction by the addition of a liquid while leaving the coarse fraction in a dry state;
- c) pumping said paste into the fluidizing bed of the combustor through at least one first nozzle;
- d) transporting said coarse coal fraction in said dry state to a pressure increasing device prior to supplying said coarse fraction to the fluidized bed; and
- e) supplying the coarse coal fraction and crushed absorbent to the combustor pneumatically in said dry state.
- 3. A method according to claim 2 wherein said pressure increasing device comprises at least one lock-hopper device.
- 4. A method according to claim 2 wherein said coarse fraction is supplied to the combustor through at least one second nozzle.
- 5. A method according to claim 2 wherein said liquid is selected from water, oil, and a mixture of water, oil and an emulsifier.
- 6. A method according to claim 1 wherein said paste includes at least one of an oil and an emulsifier.
- 7. A method according to claim 2 wherein said coarse coal fraction and said absorbent are supplied to the combustor through a common lock-hopper system.
- 8. A method according to claim 2 wherein the fine coal fraction and its transport gas and dust from the transport gas for the coarse coal fraction are separated in a common dust separating device.
- 9. A method according to claim 3 wherein the coarse coal fraction is pneumatically transported to said lock-hopper device, the transport gas is cleaned in at least one of a cyclone and a scrubber, and wherein dust separated from the transport gas is mixed with the fine coal fraction and constitutes part of said paste.
- 10. In a power plant with a combustor for combustion of coal in a bed of particulate material containing a sulphur absorbent an apparatus for feeding said coal into said combustor, comprising:
- a screening device for dividing crushed coal into a fine and a coarse fraction;
- a transport device for transporting the fine coal fraction to a paste preparation container;
- devices for mixing the fine coal fraction with a liquid for preparation of a pumpable paste;
- a paste pump for pumping the paste to nozzles in the combustor;
- at least one conveying pipe for transporting the coarse coal fraction and crushed sulphur absorbent to at least one pressure increasing means;
- dispensing and transport devices for feeding the coarse coal fraction and the sulphur absorbent into the combustor via nozzles;
- a dust separator for separation of dust from the transport gas for the fine coal fraction and from the transport gas for the coarse coal fraction; and
- wherein dust separated from the transport gas is mixed with the fine coal fraction and constitutes part of the prepared fuel paste.
- 11. A power plant with a combustor for combustion of coal in a bed of particulate material containing a sulphur absorbent and apparatus for feeding said coal into said combustor, comprising:
- a screening device for dividing crushed coal into a fine and a coarse fraction;
- a transport device for transporting the fine coal fraction to a paste preparation container;
- devices for mixing the fine coal fraction with a liquid for preparation of a pumpable paste;
- a paste pump for pumping the paste to first nozzles in the combustor;
- at least one conveying pipe for transporting the coarse coal fraction and crushed sulphur absorbent to at least one pressure increasing means;
- dispensing and transport devices for feeding the coarse coal fraction and the sulphur absorbent into the combustor via second nozzles;
- a dust separator in which the fine coal fraction is separated from the transport gas and thereafter is supplied to said paste preparation container; and
- a pressure increasing device, to which the coarse coal fraction is transported before being supplied to the fluidized bed.
- 12. An apparatus according to claim 11 wherein said pressure increasing device is at least one lock-hopper device.
- 13. An apparatus according to claim 11 wherein said liquid is selected from water, oil, and a mixture of water, oil and an emulsifier.
- 14. An apparatus according to claim 11 wherein said paste includes at least one of an oil and an emulsifier.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9000354 |
Feb 1990 |
SEX |
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Parent Case Info
This application is a continuation of Ser. No. 07/917,069, filed as PCT/SE91/00063, Jaan. 29, 1991 published as WO91/11659, aug. 8,1991.
US Referenced Citations (7)
Non-Patent Literature Citations (3)
Entry |
Patent abstracts of Japan, vol. 4, No. 183, m 47, abstract of JP 55-131617, pub. 1980-10-13. |
Patent abstracts of Japan, vol. 7, No. 246, m253, abstract of JP 58-133506, publ. 1983-08-09 (Kawasaki Jukogyo K.K.). |
Patent abstracts of Japan, vol. 4, No. 183, m 47, abstract of JP 55-131617, publ. 1980-10-13 ( Mitsui Zosen K.K.). |
Continuations (1)
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Number |
Date |
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Parent |
917069 |
Aug 1992 |
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