Exhaust-gas treatment device for an aircraft engine

1. An exhaust-gas treatment device for an aircraft engine, comprising:

an exhaust-gas channel, through which an exhaust gas of the aircraft engine flows, and a first cooling unit arranged downstream of the aircraft engine for cooling with ambient air, further comprising a second cooling unit, which is arranged downstream of the first cooling unit with respect to an exhaust-gas flow in the exhaust-gas channel.

2. The exhaust-gas treatment device according to claim 1 , wherein the first cooling unit has a heat exchanger that is configured and arranged for cooling with ambient air.

3. The exhaust-gas treatment device according to claim 1 , wherein the second cooling unit has a cooling circuit with an evaporator, which is assigned to the exhaust-gas channel, wherein the evaporator is a plate evaporator.

4. The exhaust-gas treatment device according to claim 3 , wherein the evaporator is a plate evaporator, wherein a collecting groove is arranged on at least one plate of the plate evaporator.

5. The exhaust-gas treatment device according to claim 1 , wherein the second cooling unit has a heat exchanger with cryogenic fluid flowing therethrough.

6. The exhaust-gas treatment device according to claim 1 , wherein a droplet separator is provided downstream of the second cooling unit with respect to an exhaust-gas flow in the exhaust-gas channel.

7. The exhaust-gas treatment device according to claim 6 , wherein the droplet separator is a centrifugal separator.

8. The exhaust-gas treatment device according to claim 1 , further comprising an ionizer assigned to the exhaust-gas channel for electrostatic charging of the exhaust gas, wherein a pole, which is complementary to the ionizer, is assigned downstream to the exhaust-gas channel with respect to an exhaust-gas flow in the exhaust-gas channel.

9. The exhaust-gas treatment device according to claim 8 , wherein the complementary pole is applied on the second cooling unit and/or on a droplet separator.

10. The exhaust-gas treatment device according to claim 1 , further comprising a control unit for controlling the first cooling unit and the second cooling unit, wherein the control unit is configured and arranged so the exhaust gas

is cooled in a first operating state with the first cooling unit and the second cooling unit;

is cooled in a second operating state only with the first cooling unit or the second cooling unit.

11. An aircraft with an aircraft engine having an exhaust-gas treatment device according to claim 1 .

12. The aircraft according to claim 11 , further comprising a post-treatment evaporator for the generation of water vapor by evaporation of water that has been condensed with the exhaust-gas treatment device, wherein the evaporator is coupled to the aircraft engine so that water vapor generated is introduced into a gas channel of the aircraft engine and/or is utilized for cooling a component assigned to the gas channel.

13. A method for operating an exhaust-gas treatment device according to claim 1 , wherein

exhaust gas flows through the exhaust-gas channel, and

is precooled using the first cooling unit and further cooled using the second cooling unit.

14. Use of an exhaust-gas treatment device according to claim 1 in an aircraft engine or aircraft.

15. The use according to claim 14 , wherein a heat exchanger of an exhaust-gas treatment device, which is part of a cooling circuit, is arranged on the aircraft or in a secondary flow channel of the aircraft engine.

16. A method for operating an exhaust-gas treatment device for operating an aircraft according to claim 11 , wherein

exhaust gas flows through the exhaust-gas channel, and

is precooled using the first cooling unit and further cooled using the second cooling unit.

17. Use of an exhaust-gas treatment device in an aircraft engine or aircraft in a method according to claim 16 .

18. The use of an exhaust-gas treatment device, in which a heat exchanger of an exhaust-gas treatment device according to claim 2 , is part of the cooling circuit, is arranged on the aircraft or in a secondary flow channel of the aircraft engine.

19. The use according to claim 17 , wherein a condenser of an exhaust-gas treatment device is part of a cooling circuit and is arranged on the aircraft or in a secondary flow channel of the aircraft engine.