Method and system for feeding a reducing agent into a catalyst device

• US 20020023433A1
• Filed: 08/09/2001
• Published: 02/28/2002
• Est. Priority Date: 08/09/2000
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG, Daimler Chrysler Company LLC (Stellantis NV), Audi AG (Volkswagen AG), Dr Ing hc F Porsche AG (Volkswagen AG), Volkswagen AG
• Original Assignee: Bayerische Motoren Werke AG, Daimler Chrysler Company LLC (Stellantis NV), Audi AG (Volkswagen AG), Dr Ing hc F Porsche AG (Volkswagen AG), Volkswagen AG
• Inventors: Goerigk, Christian, Wessels, Stefan, Illek, Michael
• Granted Patent: US 6,502,390 B2
• Time in Patent Office: Days
• US Class Current: 60/286
• CPC Class Codes: B01D 53/9431 Processes characterised by a specific device
• CPC Class Codes: B01D 53/9495 Controlling the catalytic process
• CPC Class Codes: F01N 2610/02 the substance being ammonia or urea
• CPC Class Codes: F01N 2610/12 the substance being in solid form, e.g. pellets or powder
• CPC Class Codes: F01N 3/2066 Selective catalytic reduction [SCR]
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

The present invention concerns a method and a system for feeding a reducing agent into a catalyst device. A first reservoir is provided and has a solid reducing agent, a second reservoir is provided and has a solvent for the solid reducing agent, and a reducing agent solution is produced from the solid reducing agent and the solvent. The reducing agent solution is intermittently stored in a third reservoir, and the reducing agent solution is fed from the third reservoir into the catalyst device.

Claims

1. A method for feeding a reducing agent into a catalyst device comprising:

providing a first reservoir having a solid reducing agent,

providing a second reservoir having a solvent for the solid reducing agent,

producing a reducing agent solution from the solid reducing agent and the solvent,

intermediately storing the reducing agent solution in a third reservoir, and

feeding the reducing agent solution from the third reservoir into the catalyst device.

2. The method according to claim 1, wherein production of the reducing agent solution is carried out by metered introduction of the solid reducing agent and the solvent into the third reservoir.

3. The method according to claim 1, wherein production of the reducing agent solution is implemented by metered introduction of the solid reducing agent and the solvent into a mixing device provided between the first reservoir and the third reservoir, and wherein the reducing agent solution is conducted from the mixing device into the third reservoir.

4. The method according to claim 2, and further comprising measuring a concentration of the reducing agent solution and controlling the metered introduction such that a predeterminable concentration is adjusted.

5. The method according to claim 1, wherein the solid reducing agent is pulverized.

6. The method according to claim 2, wherein the solid reducing agent is provided in prepressed units of mass.

7. The method according to claim 2, wherein the solid reducing agent is provided as an extruded basic body.

8. The method according to claim 7, and further comprising dipping the basic body for producing the reducing agent solution into the solvent or the reducing agent solution.

9. The method according to claim 8, wherein a dipping time is determined as a function of a desired or detected concentration.

10. The method according to claim 1, wherein the solvent is water which is obtained by condensation.

11. The method according to claim 3, and further comprising measuring a concentration of the reducing agent solution and controlling the metered introduction such that a predeterminable concentration is adjusted.

12. The method according to claim 2, wherein the solid reducing agent is pulverized.

13. The method according to claim 3, wherein the solid reducing agent is pulverized.

14. The method according to claim 4, wherein the solid reducing agent is pulverized.

15. The method according to claim 11, wherein the solid reducing agent is pulverized.

16. The method according to claim 3, wherein the solid reducing agent is provided in prepressed units of mass.

17. The method according to claim 4, wherein the solid reducing agent is provided in prepressed units of mass.

18. The method according to claim 11, wherein the solid reducing agent is provided in prepressed units of mass.

19. The method according to claim 3, wherein the solid reducing agent is provided as an extruded basic body.

20. The method according to claim 4, wherein the solid reducing agent is provided as an extruded basic body.

21. The method according to claim 11, wherein the solid reducing agent is provided as an extruded basic body.

22. The method according to claim 19, and further comprising dipping the basic body for producing the reducing agent solution into the solvent or the reducing agent solution.

23. The method according to claim 20, and further comprising dipping the basic body for producing the reducing agent solution into the solvent or the reducing agent solution.

24. The method according to claim 21, and further comprising dipping the basic body for producing the reducing agent solution into the solvent or the reducing agent solution.

25. The method according to claim 22, wherein a dipping time is determined as a function of a desired or detected concentration.

26. The method according to claim 23, wherein a dipping time is determined as a function of a desired or detected concentration.

27. The method according to claim 24, wherein a dipping time is determined as a function of a desired or detected concentration.

28. The method according to claim 2, wherein the solvent is water which is obtained by condensation.

29. The method according to claim 3, wherein the solvent is water which is obtained by condensation.

30. The method according to claim 4, wherein the solvent is water which is obtained by condensation.

31. The method according to claim 5, wherein the solvent is water which is obtained by condensation.

32. The method according to claim 6, wherein the solvent is water which is obtained by condensation.

33. The method according to claim 7, wherein the solvent is water which is obtained by condensation.

34. The method according to claim 8, wherein the solvent is water which is obtained by condensation.

35. The method according to claim 9, wherein the solvent is water which is obtained by condensation.

37. The system according to claim 36, wherein the reducing agent solution producing device has a metering device for metered introduction of the solid reducing agent and the solvent into the third reservoir.

38. The system according to claim 36, wherein the reducing agent solution producing device has a metering device for metered introduction of the solid reducing agent and the solvent into a mixing device arranged between the first reservoir and the third reservoir and a conducting device for conducting the reducing agent solution from the mixing device into the third reservoir.

39. The system according to claim 37, and further comprising a concentration sensor device for measuring a concentration of the reducing agent solution, and a control device for controlling the metered introduction such that a predeterminable concentration can be adjusted.

40. The system according to claim 36, and further comprising a pulverizing device for pulverizing the solid reducing agent.

41. The system according to claim 36, and further comprising a cutting device for cutting the solid reducing agent.

42. The system according to claim 36, wherein the solvent is water and can be provided, by a condensation device, from the exhaust gas or an air-conditioning system.

43. The system according to claim 38, and further comprising a concentration sensor device for measuring a concentration of the reducing agent solution, and a control device for controlling the metered introduction such that a predeterminable concentration can be adjusted.

44. The system according to claim 37, and further comprising a pulverizing device for pulverizing the solid reducing agent.

45. The system according to claim 38, and further comprising a pulverizing device for pulverizing the solid reducing agent.

46. The system according to claim 39, and further comprising a pulverizing device for pulverizing the solid reducing agent.

47. The system according to claim 43, and further comprising a pulverizing device for pulverizing the solid reducing agent.

48. The system according to claim 37 and further comprising a cutting device for cutting the solid reducing agent.

49. The system according to claim 38 and further comprising a cutting device for cutting the solid reducing agent.

50. The system according to claim 39 and further comprising a cutting device for cutting the solid reducing agent.

51. The system according to claim 40 and further comprising a cutting device for cutting the solid reducing agent.

52. The system according to claim 43 and further comprising a cutting device for cutting the solid reducing agent.

53. The system according to claim 37, wherein the solvent is water and can be provided, by a condensation device, from the exhaust gas or an air-conditioning system.

54. The system according to claim 38, wherein the solvent is water and can be provided, by a condensation device, from the exhaust gas or an air-conditioning system.

55. The system according to claim 39, wherein the solvent is water and can be provided, by a condensation device, from the exhaust gas or an air-conditioning system.

56. The system according to claim 40, wherein the solvent is water and can be provided, by a condensation device, from the exhaust gas or an air-conditioning system.

57. The system according to claim 41, wherein the solvent is water and can be provided, by a condensation device, from the exhaust gas or an air-conditioning system.

36. A system for feeding a reducing agent into a catalyst device comprising:

a first reservoir with a solid reducing agent,

a second reservoir with a solvent for the solid reducing agent,

a reducing agent solution producing device for producing a reducing agent solution from the solid reducing agent and the solvent;

a third reservoir for intermediately storing the reducing agent solution; and

a feeding device for feeding the reducing agent solution from the third reservoir into the catalyst device.