Method and apparatus for compacting coal for a coal coking process
View Patent ↗Relatively high speed methods for increasing the bulk density of coal particles, apparatus for increasing the bulk density of coal particles and methods for making metallurgical coke. Once such method includes depositing coal particles onto a charging plate external to a coking oven to provide an elongate bed of dry, uncompacted coal having an upper surface of the charging plate. The charging plate has side walls, and at least one movable end wall An impact pressure is applied to the upper surface of the bed of dry, uncompacted coal while degassing the coal to provide a dry, compacted coal bed having a bulk density ranging from about 960 to about 1200 kilograms per cubic meter.
1. A relatively high speed method for increasing the bulk density of coal particles to provide an elongate bed of dry, compacted coal for charging to a coking oven, the method comprising the steps of:
depositing coal particles onto a charging plate external to a coking oven, the charging plate having side walls, and at least one movable end wall to provide an elongate bed of dry, uncompacted coal having an upper surface on the charging plate; and
applying impact pressure to the upper surface of the bed of dry, uncompacted coal while degassing the coal to provide a dry, compacted coal bed having a bulk density ranging from about 960 to about 1200 kilograms per cubic meter, wherein degassing the coal is selected from the group consisting of applying a vacuum source to one or more probes inserted into the uncompated coal bed and venting air through one or more probes inserted into the uncompated coal bed.
2. The method of claim 1 , wherein degassing the coal bed is comprised of applying a vacuum source to one or more probes inserted in the uncompacted coal bed.
3. The method of claim 2 , wherein the vacuum source provides a vacuum to the uncompacted coal bed ranging from about 185 to about 280 mm of Hg during the degassing step.
4. The method of claim 1 , wherein degassing the coal bed comprises venting air through one or more probes inserted into the uncompacted coal bed.
5. The method of claim 1 , wherein the coal particles are compacted to the bulk density ranging from about 960 to about 1200 kilograms per cubic meter from an initial bulk density ranging from about 640 to about 800 kilograms per cubic meter in less than about three minutes.
6. The method of claim 1 , wherein the impact pressure ranges from about two up to about 3.5 kilogram-force meter/kilogram of coal.
7. The method of claim 1 , further comprising applying from about one to about five impacts to the upper surface of the coal bed.
8. A method for making metallurgical coke from coal, comprising charging a coking oven with the dry, compacted coal bed made by the method of claim 1 and heating the coal at a temperature and for a period of time under a reducing atmosphere to provide metallurgical coke.
9. Metallurgical coke made by the method of claim 8 .
10. A coal compacting and coke oven charging apparatus comprising:
a coal bed charge car comprising a transfer plate having side walls, at least one movable end wall, and a transfer plate translating mechanism for transportation compacted coal into the coke oven; and
a coal compaction device comprising:
a pressure plate for applying pressure to an upper surface of a dry, uncompacted bed of coal deposited on the transfer plate; and
a vacuum source for degassing the uncompacted bed of coal to provide a dry, compacted coal bed having a bulk density ranging from about 960 to about 1200 kilograms per cubic meter.
11. The coal compacting and coke oven coal charging apparatus of claim 10 , wherein the coal compaction device further comprises a ram for applying an intermittent impact force to the pressure plate.
12. The coal compacting and coke oven coal charging apparatus of claim 10 , further comprising perforated probes attached to the pressure plate for degassing the uncompacted bed of coal during a compaction process.
13. The coal compacting and coke oven coal charging apparatus of claim 10 , further comprising a pier for supporting the charge car during a compaction process.
14. The coal compacting and coke oven coal charging apparatus of claim 10 , further comprising a backstop device attached adjacent to the at least one movable end wall for retaining compacted coal in the coke oven while withdrawing the transfer plate from the oven.
15. The coal compacting and coke oven coal charging apparatus of claim 10 , wherein the charge car further comprises a height adjustment mechanism for adjusting a height of the transfer plate during a coke oven compacted coal charging process.
16. The coal compacting and coke oven coal charging apparatus of claim 10 , further comprising a coal depositing and leveling device for depositing uncompacted coal into the charge car, the coal depositing and leveling device comprising a telescoping chute and coal weigh bin in flow communication with the chute for deposited a predetermined amount of coal into the charge car and for leveling the uncompacted coal on the transfer plate.
17. A method for operating a horizontal non-recovery coke oven using a relatively low quality coal source, the method comprising the steps of:
depositing coal particles on a transfer plate device to provide an uncompacted bed of coal, the transfer plate device having a translatable spatula, side walls and at least one movable end wall;
applying pressure to an upper surface of the uncompacted coal bed while degassing the coal bed to provide a dry, compacted coal bed having a bulk density ranging from about 960 to about 1200 kilograms per cubic meter, wherein degassing the coal bed is selected from the group consisting of applying a vacuum source to one or more probes inserted in the uncompated coal bed and venting air through one or more probes inserted into the uncompated coal bed;
translating the spatula containing compacted coal into the coke oven;
removing the spatula from the coke oven while retaining the compacted coal in the coke oven; and
conducting a coking process on the compacted coal in the coke oven.
18. The method of claim 17 , wherein the degassing process is comprised of applying a vacuum to the coal bed.
19. The method of claim 18 , wherein the vacuum applied to the coal bed is applied by a vacuum source that generates a vacuum ranging from about 185 to about 280 mm Hg.
20. The method of claim 17 , wherein pressure is applied to the upper surface of the uncompacted coal bed using impact energy ranging from about two up to about 3.5 kilogram-force meter/kilogram of coal.
21. The method of claim 17 , wherein the degassing process is comprised of applying a vacuum source to one or more probes inserted in the uncompacted coal bed.
22. The method of claim 17 , wherein the degassing process comprises venting air through one or more probes inserted into the uncompacted coal bed.
23. The method of claim 17 , wherein the coal particles are compacted to the bulk density ranging from about 960 to about 1200 kilograms per cubic meter from an initial bulk density ranging from about 640 to about 800 kilograms per cubic meter in less than about three minutes.
24. The method of claim 17 , the step of applying pressure to the upper surface of the uncompacted coal bed comprises impacting the uncompacted coal bed with from one to about five impacts applied to a pressure plate in contact with the upper surface of the uncompacted coal bed.