IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0566174
(2009-09-24)
|
등록번호 |
US-8197561
(2012-06-12)
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발명자
/ 주소 |
- Dunlop, Donald D.
- Camper, Clinton B.
- Sethi, Vijay
- Kenyon, Jr., Leon C.
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
119 |
초록
▼
A process for drying coal is provided in which coal is passed into a fluidized bed reactor and heated to a predetermined temperature. The dried coal is then fed to a cooler where the temperature of the product is reduced to approximately 200 degrees Fahrenheit and water is added to further passivate
A process for drying coal is provided in which coal is passed into a fluidized bed reactor and heated to a predetermined temperature. The dried coal is then fed to a cooler where the temperature of the product is reduced to approximately 200 degrees Fahrenheit and water is added to further passivate the coal.
대표청구항
▼
1. A multistage process for drying coal, comprising: (a) charging coal to a first fluidized bed reactor, charging air to said first fluidized bed reactor at a velocity of from about 5 to about 8 feet per second, subjecting said coal to a first temperature of from about 300 to about 550 degrees Fahre
1. A multistage process for drying coal, comprising: (a) charging coal to a first fluidized bed reactor, charging air to said first fluidized bed reactor at a velocity of from about 5 to about 8 feet per second, subjecting said coal to a first temperature of from about 300 to about 550 degrees Fahrenheit, and removing from about 40 to about 60 weight percent of the water in said coal from said coal, wherein:i. said coal charged to said first fluidized bed reactor has a moisture content of from about 15 to about 40 percent and a combined oxygen content of from 10 to about 25 percent,ii. said first fluidized bed reactor is comprised of a fluidized bed with a fluidized bed density of from about 20 to about 50 pounds per cubic foot, whereby a first, partially dried coal is produced;(b) feeding said first, partially dried coal into a second fluidized bed reactor, feeding air into said second fluidized bed, subjecting said coal to a second temperature to about 250 degrees Fahrenheit, and removing water from said dried coal until no more than about 1 weight percent of water remains in said coal,(c) feeding said dried coal into a cooler where it is cooled to a temperature less than about 212 degrees Fahrenheit and mixed with water, said cooler employs at least one of a screw conveyor and a rotary tube. 2. The process of claim 1, further comprising the step of simultaneously feeding air into said first fluidized bed reactor and maintaining said first fluidized bed at a density of from about 20 to about 50 pounds per cubic foot while removing water from said first fluidized bed reactor. 3. The process of claim 2, wherein said air fed into said first fluidized bed reactor is at a temperature of from about 250 to about 400 degrees Fahrenheit. 4. The process of claim 2, wherein said air fed into said first fluidized bed reactor is at said first temperature of from about 300 to about 350 degrees Fahrenheit. 5. The process of claim 2, wherein said air is fed into said first fluidized bed reactor at a velocity of from about 5 to about 8 feet per second. 6. The process of claim 1, wherein said coal charged to said first fluidized bed reactor is 2″×0″ coal. 7. The process of claim 1, wherein said coal charged to said first fluidized bed reactor is selected from the group consisting of lignitic coal, sub-bituminous coal, bituminous coal, and mixtures thereof. 8. The process of claim 1, wherein said coal in said first fluidized bed reactor is maintained at said first temperature of from about 400-650 degrees Fahrenheit. 9. The process of claim 1, wherein said fluidized bed is maintained at a fluidized bed density of from about 20 to about 40 pounds per square inch. 10. The process of claim 1, wherein said fluidized bed is maintained at a fluidized bed density of from about 20 to about 30 pounds per square inch. 11. The process of claim 1, further comprising the step of heating said air prior to the time it is fed into said first fluidized bed reactor. 12. The process of claim 11, wherein said air is heated by a heat exchanger prior to the time it is fed into said first fluidized bed reactor. 13. The process of claim 1, further comprising the step of removing coal particles with a particle size less than about 400 microns from said first fluidized bed reactor. 14. The process of claim 13, wherein said coal particles with a particle size less than about 400 microns that have been removed from said first fluidized bed reactor are fed into a cyclone. 15. The process of claim 1, further comprising the step feeding gas into said second fluidized bed reactor. 16. The process of claim 15, wherein the coal is partially oxidized to provide process heat and reduce the equilibrium moisture of the coal. 17. The process of claim 1, wherein said cooler comprises at least one water sprays and at least one temperature sensors to allow water to be applied to the coal for at least one of progressively lowering the temperature of the coal to less about 200 degrees Fahrenheit and adding about 5 to 12 percent moisture to the coal. 18. The process of claim 17 wherein the application of water is continuous. 19. The process of claim 17 wherein the application of water is intermittent. 20. A continuous process for drying and reducing the equilibrium moisture of coal, comprising: a. charging the coal to a fluidized bed reactor, supplying air to the fluidized bed reactor, subjecting the coal to a temperature of about 450 to about 650 degrees Fahrenheit, drying the coal to a moisture content of less than about 2 percent by weight, and reducing the equilibrium moisture content of the coal to a range of about 6 to about 12 percent to produce a dried coal product; andb. feeding the dry coal product from the fluidized bed reactor to a cooler where the product is cooled to less than about 212 degrees Fahrenheit and about 5 to about 12 percent by weight of water is added to satisfy the equilibrium moisture of the product, said cooler employs at least one of a screw conveyor and a rotary tube. 21. The process of claim 20, comprising the step of simultaneously feeding air and coal into the fluidized bed reactor, maintaining a density of about 20 to about 50 pounds per cubic feet while removing moisture and reducing the equilibrium moisture of the coal. 22. The process of claim 21, wherein said air is at ambient temperature 23. The process of claim 21, wherein said coal is at ambient temperature. 24. The process of claim 21, wherein said air is fed into the fluidized bed reactor to maintain a velocity of about 4 to about 9 feet per second. 25. The process of claim 20, wherein the coal charged to the fluidized bed reactor is about 3″×0″ coal. 26. The process of claim 20, wherein the coal charged to the fluidized bed reactor is selected from the group consisting of lignite coal, sub-bituminous coal, and bituminous coal and mixtures thereof. 27. The process of claim 20, wherein the fluidized bed reactor is maintained at a temperature of about 450 to about 650 degrees Fahrenheit. 28. The process of claim 20, wherein the product from the fluidized bed reactor is fed to a cooler where water is applied to the product reducing the temperature from about 450 to 650 degrees Fahrenheit to a temperature less than 212 degrees Fahrenheit and sufficient excess water is added to rehydrate the product to about 5 to about 12 percent by weight of water. 29. The process of claim 27 wherein water is added to satisfy the reduced equilibrium moisture of the product reducing its tendency to reheat through the absorption of moisture after cooling. 30. The process of claim 1 wherein said cooler employs a water spray that that is used to cool the dried coal, said water spray being controlled by a rotary valve. 31. The process of claim 30 wherein the cooler employs said screw conveyor that further cools the coal that has been exposed to the water spray. 32. The process of claim 30 wherein said water spray is continuous. 33. The process of claim 30 wherein said rotary valve is indexed to open a solenoid valve to inject water.
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