Exhaust gas aftertreatment device

Abstract

To provide a soot blower unit, an exhaust gas after treatment device, an internal combustion engine, and a method for blowing off soot from a catalyst so as to avoid known defects, in particular, to provide certainty and durability in removing the soot from the catalyst.SOLUTION: The invention relates to a soot blower unit 20 for an exhaust gas after treatment device 10 for an internal combustion engine 1, the exhaust gas after treatment device 10, the internal combustion engine 1 and a method for blowing soot from a catalyst 30. The soot blower unit 20 comprises a supply line 21 for providing pressurised air and at least one injection device 22 with a soot blowing valve 23, in particular, a diaphragm valve, being fluidly connected or connectable to the supply line 21 for providing pressurised air. The soot blower unit 20 comprises a pipeline 24 for providing back-up sealing air, fluidly connected or connectable to the supply line 21 for providing pressurised air, upstream of the at least one injection device 22.SELECTED DRAWING: Figure 1

Claims

1. A soot blower unit (20) for an exhaust gas aftertreatment device (10) for an internal combustion engine (1), A supply line (21) for providing pressurized air, At least one injection device (22) having a soot blower valve (23) fluidly connected to or fluidly connectable to the supply line (21) for providing pressurized air, wherein back pressure for keeping the soot blower valve closed can be provided by the pressurized air via the supply line, In a soot blower unit (20) having, A soot blower unit (20) having a pipeline (24) for providing backup sealing air, which is fluidly connected to or fluidly connectable to the supply line (21) for providing pressurized air, wherein the back pressure for keeping the soot blower valve closed can be provided by the backup sealing air through the pipeline.

2. The soot blower unit (20) according to claim 1, wherein the soot blower valve (23) is a diaphragm valve.

3. The soot blower unit (20) according to claim 1, wherein the soot blower unit (20) has a soot blower air compressor (25).

4. The soot blower unit (20) according to claim 1, wherein the soot blower unit (20) has a soot blower main valve (26) located in the supply line.

5. The pipeline (24) for providing backup sealing air, and The supply line (21) for providing pressurized air The soot blower unit (20) according to claim 1, wherein at least one of the members is provided with a check valve (27a, 27b).

6. The soot blower unit (20) according to claim 5, wherein the check valves (27a, 27b) are located downstream of the soot blower main valve (26).

7. The soot blower unit (20) according to claim 1, further comprising a control unit (29) for setting at least one of the at least one soot blower valve (23) and soot blower main valve (26).

8. The soot blower unit (20) according to claim 7, wherein the control unit is designed to receive data from a sensor representing the soot load of the catalyst (30).

9. The soot blower unit (20) according to claim 8, wherein the control unit is designed to receive sensor data representing the pressure drop of exhaust gas along the SCR reactor (37).

10. The soot blower unit (20) according to claim 8, wherein the control unit is designed to open only at least one of the soot blower valve (23) and the soot blower main valve (26) when the data exceeds a predetermined data.

11. The soot blower unit (20) according to claim 7, wherein the control unit (29) is designed to open a soot blower main valve (26) located in the supply line (21) for providing pressurized air when the internal combustion engine (1) is to be operated in TIER III mode.

12. Exhaust gas aftertreatment device (10) for an internal combustion engine (1), comprising at least one SCR catalyst (30) and at least one soot blower unit (20) according to any one of claims 1 to 11.

13. The exhaust gas aftertreatment device (10) according to claim 12, wherein the soot blower unit (20) is arranged such that the airflow from the injection device (22) flows in a direction (35) different from the main flow direction (34) of the exhaust gas.

14. An internal combustion engine (1) having at least one cylinder (2) and at least one exhaust gas aftertreatment device (10) according to claim 12.

15. The internal combustion engine (1) according to claim 14, wherein the internal combustion engine (1) has a turbocharger (31), and the exhaust gas aftertreatment device (10) is located upstream of the turbine (32) of the turbocharger (31).

16. The internal combustion engine (1) according to claim 14, wherein the internal combustion engine (1) has a turbocharger (31), and the pipeline (24) for providing backup sealing air is fluidly connected to or can be fluidly connected to the compressor (33) of the turbocharger (31).

17. A method for blowing soot off a catalyst (30) of an exhaust gas aftertreatment device (10) for an internal combustion engine (1), Pressurized air is supplied to the supply line (21). The pressurized air is blown onto the catalyst (30) via at least one injection device (22) having a soot blower valve (23) fluidly connected to the supply line (21) for providing pressurized air. A method in which, upstream of at least one injection device (22), backup sealing air is supplied to a pipeline (24) which is fluidly connected to the supply line (21) for supplying pressurized air, thereby providing back pressure to keep the soot blower valve closed by the pressurized air via the supply line and by the backup sealing air via the pipeline.

18. The method according to claim 17, wherein the backup sealing air is scavenging air supplied to the compressor (33) of the turbocharger (31) of the internal combustion engine (1).

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