Process to dewater a soot water slurry obtained in a gasification process
View Patent ↗A process for partial oxidation of a hydrocarbon gas or liquid, involving the steps of partial oxidation and removal of soot by forming a slurry having water and carbon from the gaseous oxidation product, and separating part of the water from the slurry to obtain a soot composition having less water, wherein the separation is performed by means of a decanter centrifuge.
1. A process for the partial oxidation of a hydrocarbon gas or liquid, said process comprises the steps of conducting a partial oxidation of the hydrocarbon gas or liquid to yield a gaseous oxidation product comprising soot and removing said soot from the gaseous oxidation product by forming a slurry comprising water and carbon from the gaseous oxidation product, and separating part of the water from the slurry to obtain a soot composition comprising less water than that of the slurry, wherein the separation is performed by means of a decanter centrifuge.
2. The process according to claim 1 , wherein the decanter centrifuge, provided with a rotatable drum and a rotatable soot-cake conveyor, is operated such that there is a difference in the rotations per minute of the rotatable drum and the rotatable soot-cake conveyor of less than 10 rotations per minute.
3. The process according to claim 2 , wherein the difference is less than 3 rotations per minute.
4. The process according to claim 3 , wherein the centrifugal force in the decanter centrifuge and relative to gravity is more than 1200.
5. The process according to claim 4 , wherein the length to diameter ratio of the rotating drum of the decanter centrifuge is more than 3.5.
6. The process according to claim 5 , wherein the slurry comprises a flocculant.
7. The process according to claims 5 , wherein the slurry does not comprise a flocculant.
8. The process according to claim 7 , wherein the obtained soot composition is a pumpable soot composition having a dry solids content of between 5 wt % and 15 wt %.
9. The process according to claim 8 , wherein the soot composition is transported to a further process step by means of a cake pump.
10. A process according to claim 1 , further comprising: drying the soot composition before reducing the carbon content thereof by burning the carbon with combustion air under partial oxidation conditions.
11. The process according to claim 10 , wherein the drying step is performed in a fluid bed dryer.
12. The process according to claim 10 , wherein the drying step is performed in a rotary dryer provided with an externally heated mantle.
13. The process according to claim 10 , wherein the drying step and burning step are performed in a multiple hearth furnace.
14. The process according to claim 1 , wherein the centrifugal force in the decanter centrifuge and relative to gravity is more than 1200.
15. The process according to claim 2 , wherein the centrifugal force in the decanter centrifuge and relative to gravity is more than 1200.
16. The process according to claim 1 , wherein the length to diameter ratio of the rotating drum of the decanter centrifuge is more than 3.5.
17. The process according to claim 2 , wherein the length to diameter ratio of the rotating drum of the decanter centrifuge is more than 3.5.
18. The process according to claim 3 , wherein the length to diameter ratio of the rotating drum of the decanter centrifuge is more than 3.5.
19. The process according to claim 1 , wherein the slurry comprises a flocculant.
20. The process according to claim 2 , wherein the slurry comprises a flocculant.
21. The process according to claim 3 , wherein the slurry comprises a flocculant.
22. The process according to claim 4 , wherein the slurry comprises a flocculant.
23. The process according to claim 1 , wherein the slurry does not comprise a flocculant.
24. The process according to claim 2 , wherein the slurry does not comprise a flocculant.
25. The process according to claim 3 , wherein the slurry does not comprise a flocculant.
26. The process according to claim 4 , wherein the slurry does not comprise a flocculant.
27. The process according to claim 1 , wherein the obtained soot composition is a pumpable soot composition having a dry solids content of between 5 wt % and 15 wt %.
28. The process according to claim 2 , wherein the obtained soot composition is a pumpable soot composition having a dry solids content of between 5 wt % and 15 wt %.
29. The process according to claim 3 , wherein the obtained soot composition is a pumpable soot composition having a dry solids content of between 5 wt % and 15 wt %.
30. The process according to claim 4 , wherein the obtained soot composition is a pumpable soot composition having a dry solids content of between 5 wt % and 15 wt %.
31. The process according to claim 5 , wherein the obtained soot composition is a pumpable soot composition having a dry solids content of between 5 wt % and 15wt %.
32. The process according to claim 6 , wherein the obtained soot composition is a pumpable soot composition having a dry solids content of between 5 wt % and 15 wt %.
33. The process according to claim 27 , wherein the soot composition is transported to a further process step by means of a cake pump.
34. The process according to claim 28 , wherein the soot composition is transported to a further process step by means of a cake pump.
35. The process according to claim 29 , wherein the soot composition is transported to a further process step by means of a cake pump.
36. The process according to claim 30 , wherein the soot composition is transported to a further process step by means of a cake pump.
37. The process according to claim 31 , wherein the soot composition is transported to a further process step by means of a cake pump.
38. The process according to claim 32 , wherein the soot composition is transported to a further process step by means of a cake pump.