Method for cooling exhaust gas and exhaust gas cooling device

Abstract

The invention relates to a method for cooling exhaust gas comprising the following steps: a) Providing fuel (24) in a combustion chamber (22), b) Burning the fuel (24) so ​​that an exhaust gas is produced, c) Directing the exhaust gas into a liquid so that the liquid is heated by the exhaust gas and the exhaust gas is cooled by the liquid, d) Feeding the heated liquid into a heat exchanger (46) and / or a heat engine and e) Cooling the heated liquid in the heat exchanger (46) and / or in the heat engine.

Description

[0001] The invention relates to a method for cooling exhaust gas. The invention also relates to an exhaust gas cooling device for carrying out such a method, as well as an exhaust gas treatment device for such an exhaust gas cooling device.

[0002] Exhaust gases can be produced, in particular, during the combustion of fuel in various systems such as internal combustion engines, power plants, industrial facilities, and heating systems. Exhaust gases can be particularly reactive and corrosive at high temperatures, thus damaging various components in the combustion systems. Various methods and devices are known in the art in which water, in the form of fine droplets or a fine mist, is sprayed into the exhaust gas stream. The purpose of this is to purify the exhaust gases, particularly through chemical reactions. Pollutants and particles are removed from the exhaust gases before they are released into the environment, thus reducing environmentally harmful emissions.

[0003] WO 00 / 07699 A2 describes a process for removing nitrogen oxides from the exhaust gas of a combustion plant. In this process, the exhaust gas is brought into contact with water and oxygen, causing them to react to form nitric acid. The nitric acid is then converted into nitrogen and water using a reducing agent.

[0004] The fuel is burned in combustion plants to make the chemical energy it contains usable. This happens, for example, in a building's heating system: the thermal energy released during fuel combustion heats a liquid, such as water. This heated liquid serves as a transport medium for the thermal energy, which can be transported to the required location and released there. Heat exchangers or heat engines, for example, are used for this purpose. Since the aforementioned exhaust gases are produced during combustion, some of which are harmful to the environment and can damage the system, efforts are made to utilize as much of the energy released during combustion as possible. The amount of usable energy in relation to the total energy released determines the efficiency of the combustion plant.

[0005] The present invention is based on the object of increasing the efficiency of such systems.

[0006] The invention solves the stated problem by a method for cooling exhaust gas with the steps: a) providing fuel in a combustion chamber, b) burning the fuel so that an exhaust gas is produced, c) feeding the exhaust gas into a liquid so that the liquid is heated by the exhaust gas and the exhaust gas is cooled by the liquid, d) feeding the heated liquid into a heat exchanger and / or a heat engine and e) cooling the heated liquid in the heat exchanger and / or in the heat engine.

[0007] A fuel is provided in a combustion chamber. The fuel is preferably a solid fuel, a liquid fuel and / or a gaseous fuel or contains these. The fuel is burned in the combustion chamber, producing an exhaust gas. The exhaust gas generally has a particle component, which includes, for example, soot and / or dust, and a gas component, which includes, for example, nitrogen, oxygen, carbon dioxide, carbon monoxide, nitrogen oxides, in particular nitrogen monoxide and / or nitrogen dioxide, and / or sulfur dioxide. The exhaust gas is discharged from the combustion chamber and fed into a container containing a liquid. The exhaust gas is fed into the liquid so that the liquid is heated by the exhaust gas and the exhaust gas is cooled by the liquid. For this purpose, the exhaust gas has a higher temperature than the liquid when it is fed into the liquid.When introduced into the liquid, the exhaust gas preferably has a temperature of at least 100°C, preferably at least 200°C, particularly preferably at least 300°C. For example, in heating furnaces and fireplaces, the temperature is generally more than 235°C and less than 350°C.

[0008] Due to its lower density, the exhaust gas introduced into the liquid rises to the surface in the form of bubbles. This creates a high surface-to-volume ratio, thus resulting in particularly effective heat transfer between the exhaust gas and the liquid. This allows the greatest possible amount of the thermal energy contained in the exhaust gas to be transferred to the liquid. This transfer occurs in the immediate vicinity of the gas bubbles, creating a temperature gradient in the liquid. In this case, the area of ​​the liquid immediately surrounding the bubbles would have a higher temperature than the rest of the liquid.

[0009] However, the rising bubbles create turbulence in the liquid, thus distributing the heat energy transferred from the gas bubbles to the liquid. This cools the area of ​​the liquid immediately surrounding the bubbles and thus the exhaust gas, allowing it to absorb new energy from the exhaust gas. It also heats the portion of the liquid that is fed to the heat exchanger and / or heat engine. The heated liquid is fed to a heat exchanger and / or heat engine.

[0010] The liquid is preferably water or oil.

[0011] A heat exchanger is understood in particular to be a device or arrangement for transferring thermal energy from one medium to another. Preferably, one medium is the heated liquid and the other medium is a fluid, preferably water, oil or air. A heat engine is understood to be a device for converting thermal energy into mechanical energy, in particular a gas turbine, a steam turbine or a Stirling engine. In the heat exchanger and / or the heat engine, the heated liquid is used as a working medium, for example in a heat transfer process or a cycle. The thermal energy of the heated liquid is at least partially utilized, so that the heated liquid is cooled in the heat exchanger and / or the heat engine.Since at least part of the particle content, which sinks to the bottom of the liquid due to its greater density and is thus removed from the exhaust gas, the exhaust gas is additionally cleaned.

[0012] An advantage of the method according to the invention is that the energy efficiency of exhaust gas generation systems or, where appropriate, higher-level systems can be increased by utilizing the thermal energy of the exhaust gas according to the invention. The invention makes it possible to cool the exhaust gas to such an extent that, when it is discharged from the liquid, it has a temperature of less than 50 °C, preferably less than 35 °C, particularly preferably less than 25 °C. The exhaust gas cooled in this way is preferably discharged into the atmosphere. Due to the low temperature of the exhaust gas, complex structural measures, for example those required for subsequent chimney installation, can be dispensed with. This makes the installation less complex and therefore more cost-effective. In addition, the efficiency of the system is improved by utilizing part of the thermal energy contained in the exhaust gas.

[0013] Preferably, the exhaust gas is fed through a feed line into a container filled with the liquid up to a liquid level. This is advantageous in that at least a portion of the exhaust gas containing solids settles to the bottom of the container over time, thus reducing the plant's pollutant emissions. Some of the pollutants contained in the exhaust gas are also dissolved in the liquid, for example, water, and can then be chemically neutralized. Particulate matter in the exhaust gas is at least partially washed out and settles at the bottom of the container along with other solid particles in the exhaust gas.

[0014] Preferably, if at least one discharge criterion is met, continuously sedimented sludge is discharged from the container via a discharge valve. The at least one discharge criterion is advantageously a time or a dimension of the particulate sludge, for example, a height of the particulate sludge. The sedimented sludge comprises, in particular, sedimented particles of the particulate portion of the exhaust gas and / or a condensed portion of the gas portion of the exhaust gas, which settles at the bottom of the container over time. Advantageously, the discharge of the sedimented sludge takes place automatically and / or in an automated manner. Alternatively or additionally, it is possible to discharge the sedimented sludge manually.

[0015] Preferably, continuously cooled exhaust gas is discharged from the container via an outlet opening in the container. For this purpose, the outlet opening is arranged at least partially, but preferably completely, above the liquid level. As an alternative to this generally advantageous configuration, it may be expedient in individual embodiments to only discharge the cooled exhaust gas from the container when at least one discharge criterion is met. Such an discharge criterion is, for example, a time, a flow parameter, for example a flow rate or a flow rate of the exhaust gas or the liquid, or a pressure. Discharge upon reaching an discharge criterion is expedient, for example, when the exhaust gas should not or cannot be discharged into the atmosphere, but should or must be filled into containers, for example.

[0016] A preferred embodiment of the method is characterized in that the heat exchanger and / or the heat engine is arranged in a circulation line and the liquid is led back into the container after passing through the heat exchanger and / or the heat engine.

[0017] Preferably, the supply line is a liquid line through which the liquid is conveyed into the container, wherein the supply line comprises a Venturi nozzle with a suction line through which the exhaust gas is conveyed into the supply line. Preferably, the Venturi nozzle comprises a constriction, wherein the suction line is arranged upstream of the constriction or within the constriction in the direction of liquid flow.

[0018] The circulation line preferably includes the supply line. Particularly preferably, the heat exchanger and / or the heat engine are then arranged upstream of the Venturi nozzle in the direction of fluid flow.

[0019] Advantageously, supply air is fed into the combustion chamber via an air supply line, with a check valve preferably arranged in the air supply line. A heating line is preferably arranged on and / or in the combustion chamber, through which a heat transfer medium to be heated flows. The heat transfer medium preferably comprises or is water, steam, air, and / or an oil.

[0020] According to a second aspect, the invention solves the stated problem by an exhaust gas cooling device for carrying out the method according to the invention with a) an exhaust gas generating device with i) a combustion chamber for burning a fuel to generate exhaust gas and ii) a discharge line for discharging exhaust gas from the combustion chamber and b) an exhaust gas treatment device with i) a container which is filled with a liquid up to a liquid level, ii) a feed line for feeding exhaust gas into the container, which feed line is fluidically connected to the discharge line of the exhaust gas generating device, and c) a heat exchanger and / or a heat engine, wherein the heat exchanger and / or the heat engine is fluidically connected to the container.

[0021] Advantageously, the exhaust gas cooling device has a circulation line for circulating heated liquid, which is fluidically connected to the container and in which the heat exchanger and / or the heat engine is arranged.

[0022] Preferably, the supply line opens into the container via an inlet opening, wherein the inlet opening is preferably arranged below the liquid level.

[0023] Advantageously, the container has an outlet opening for discharging cooled exhaust gas from the container, which outlet opening is arranged at least partially, but preferably completely, above the liquid level. Preferably, the outlet opening is fluidly connected to an exhaust line. Preferably, the exhaust gas is automatically discharged, in particular by an overpressure prevailing in the container. Alternatively or additionally, a pump for conveying the exhaust gas from the container is arranged on the exhaust line.

[0024] Preferably, the outlet opening is also designed as an overflow for draining excess liquid from the container. Alternatively or additionally, the container has a separate overflow for draining excess liquid from the container.

[0025] Preferably, a filling line for filling the container with the liquid is arranged on the container. Preferably, a filling valve is arranged in the filling line, by which the flow of liquid into the container via the filling line can be adjusted.

[0026] The exhaust gas cooling device preferably has a drain valve for draining sedimented sludge from the container. The drain valve is preferably arranged in a lower region of the container, in particular on a bottom side of the container.

[0027] Advantageously, the exhaust gas cooling device comprises a control unit configured to open and close the drain valve. Preferably, the container comprises a sensor arranged and configured to detect the sedimented sludge and / or the height of the sedimented sludge, wherein the drainage of the sedimented sludge occurs depending on the sensor data. Alternatively or additionally, the drainage of the sedimented sludge can occur depending on time and / or a mass flow of the exhaust gas and / or the liquid.

[0028] Preferably, the supply line is a liquid line having a Venturi nozzle with a suction line, wherein the suction line is fluidically connected to the discharge line of the exhaust gas generating device and the Venturi nozzle is arranged and configured to suck in the exhaust gas from the combustion chamber and to feed the exhaust gas via the suction line into the supply line.

[0029] Advantageously, the circulation line includes the supply line. The heat exchanger and / or the heat engine are then preferably arranged in the circulation line upstream of the Venturi nozzle, in particular upstream of the constriction, in the direction of fluid flow.

[0030] Preferably, the supply line has a widened portion downstream of the Venturi nozzle in the direction of liquid flow. The widened portion is characterized in particular by the supply line having a smaller internal cross-sectional area upstream of the widened portion than downstream of the widened portion. This allows for a longer residence time of the exhaust gas in the liquid while maintaining the same length of the supply line, thus allowing for a longer heat transfer time between the exhaust gas and the liquid.

[0031] Alternatively or additionally, at least one flow deflection element, such as one or more perforated diaphragms, sieves and / or wire meshes, is arranged in the supply line and / or in the container, which is designed and configured to increase the residence time of the exhaust gas in the liquid.

[0032] Advantageously, the exhaust gas generation device comprises an air supply line for supplying air into the combustion chamber. A check valve is preferably arranged in the air supply line. A pump for conveying the air supply is preferably arranged in the air supply line. Alternatively, no pump is arranged in the air supply line. In particular, the air supply is then conveyed into the combustion chamber by the suction power of the Venturi nozzle in the supply line.

[0033] The exhaust gas cooling device preferably has an exhaust gas aftertreatment device for aftertreating the exhaust gas, which is arranged downstream of the exhaust gas treatment device in the flow direction of the exhaust gas. The exhaust gas aftertreatment device preferably has at least one catalyst. The at least one catalyst is preferably a three-way catalyst, a reduction catalyst (SCR catalyst), an oxidation catalyst, or a particulate filter.

[0034] The exhaust gas aftertreatment device preferably has a further container filled with a further liquid, which is preferably water or comprises water, up to a further liquid level. Photosynthetic organisms, in particular algae, are preferably arranged in the further container for at least the short-term absorption of carbon dioxide and for converting the carbon dioxide through photosynthesis. In particular, the photosynthetic organisms can be harvested and dried and subsequently used as fuel in the combustion chamber of the exhaust gas generation device.

[0035] Advantageously, the additional container has a wall that is at least partially, but preferably completely, translucent. Alternatively or additionally, the additional container is open on one side and / or has at least one opening for admitting light into the additional container.

[0036] The invention also solves the problem by an exhaust gas treatment device for an exhaust gas cooling device according to the invention.

[0037] The accompanying figures illustrate exemplary embodiments of the invention in more detail. They show: Fig. 1 - the schematic representation of an exhaust gas cooling device according to a first embodiment of the present invention and Fig. 2 - the schematic representation of an exhaust gas cooling device according to a second embodiment of the present invention.

[0038] The Fig. The exhaust gas cooling device 10 shown in Figure 1 comprises an exhaust gas generation device 20 and an exhaust gas treatment device 30. The exhaust gas generation device comprises a combustion chamber 22 in which a fuel 24 is combusted. Supply air is conveyed into the combustion chamber 22 via an air supply line 21. A check valve 23 is arranged in the air supply line 21 to prevent backflow of fluids, in particular exhaust gas and supply air.

[0039] A heating line 25 with a heating pocket 27 is arranged on the combustion chamber 22. A heat transfer pump 28 for conveying a heat transfer medium, for example, water, is arranged in the heating line 25. The heat transfer medium is heated by the heat generated during the combustion of the fuel 24. The heated heat transfer medium is conveyed via the heating line 25 to a heat exchanger 46 arranged in the heating line 25 and then back into the heating pocket 27.

[0040] During combustion, an exhaust gas is also produced, which is discharged from the combustion chamber 22 via a discharge line 26 and conveyed to the exhaust gas treatment device 30. The exhaust gas treatment device has a container 32 filled with a liquid up to a liquid level, and a supply line 34 for supplying exhaust gas into the container 32. The supply line 34 is fluidly connected to the discharge line 26 of the exhaust gas generation device 20.

[0041] In the illustrated embodiment, the supply line 34 is designed as a liquid line in which a Venturi nozzle 42 with a suction line 44 is arranged. The suction line 44 is fluidly connected to the discharge line 26 of the exhaust gas generating device 20. The Venturi effect creates a negative pressure in the liquid-flowing Venturi nozzle 42, through which the exhaust gas is sucked in via the suction line 44 and fed into the supply line 34. The liquid and the exhaust gas are fed into the container 32 via the supply line 34.

[0042] As a result of the heat transfer between the liquid and the exhaust gas, the liquid is heated and the exhaust gas is cooled. In the container 32, at least a portion of the exhaust gas rises over time and collects above the liquid level. The container 32 has an outlet opening 38 for discharging cooled exhaust gas from the container 32, which in the illustrated embodiment is partially arranged above the liquid level. In the illustrated example, the outlet opening 38 thus also serves as an overflow for draining excess liquid from the container 32. For this purpose, the outlet opening 38 is fluidly connected to a wastewater line 49 in addition to an exhaust gas line 48. As an additional option, a gas pump 50, for example a diaphragm pump, can be installed in the exhaust gas line 48 to assist in the discharge of the gas.This is particularly advantageous if, during downstream utilization of the exhaust gas, the backpressure in the exhaust line 48 is or could be too high compared to the internal pressure of the vessel. Alternatively or additionally, it may be advisable in this case to wait until an outlet criterion is met before the exhaust gas is fed for utilization. One such criterion is, for example, the achievement of a sufficiently high internal pressure in the vessel.

[0043] Flow deflection elements 31 in the form of perforated diaphragms are arranged in the container 32, which extend the flow path of the exhaust gas and thus increase the residence time of the exhaust gas in the liquid.

[0044] In the exemplary embodiment shown, the supply line 34 is formed as part of a circulation line 36 in which a heat exchanger 46 is arranged. Alternatively or in addition to the heat exchanger 46, a heat engine (not shown) can be arranged in the circulation line 36. In the exemplary embodiment shown, the liquid heated by the exhaust gas is conveyed in the circulation line 36 to the heat exchanger 46 and / or the heat engine with the aid of a circulation pump 37. The thermal energy of the heated liquid is utilized in the heat exchanger 46 and / or the heat engine, so that the liquid cools down. The Venturi nozzle 42 is arranged in the circulation line downstream of the heat exchanger 46 and / or the heat engine in the flow direction of the liquid. The supply line 34 has a widened portion 43 downstream of the Venturi nozzle 42 in the flow direction.The inner cross-sectional area of ​​the supply line 34 is larger in the flow direction of the liquid behind the widening 43 than before the widening 43. Due to the larger cross-sectional area, the velocity of the fluid flow in the supply line 34 decreases, so that the residence time of the exhaust gas in the liquid and in particular in the supply line 34 is extended.

[0045] Over time, particles of the particulate portion of the exhaust gas and / or a condensed portion of the gas portion of the exhaust gas settle at the bottom of the container as particulate sludge. Therefore, a drain valve 40 is arranged in the lower region of the container 32 for draining sedimented particulate sludge from the container 32.

[0046] In the illustrated embodiment, a filling line 33 for filling the container with liquid is arranged on the container 32. A filling valve 35 is arranged in the filling line 33, by which the flow of liquid into the container 32 via the filling line 33 can be adjusted.

[0047] Fig.2 shows an exhaust gas cooling device 10 according to a second exemplary embodiment, comprising an exhaust gas generating device 20 and an exhaust gas treatment device 30. The exhaust gas generating device 20 has a combustion chamber 22. Supply air is fed into the combustion chamber 22 via an supply air line 21 by means of a supply air pump 29. The supply air line has a check valve 23 to prevent backflow of the supply air and / or exhaust gas. A fuel 24 is burned in the combustion chamber 22. The heat generated is used to heat a heat transfer medium flowing in a heating pocket 27. The heating pocket 27 is part of a heating line 25 through which the heat transfer medium flows. The heat transfer medium is conveyed in the heating line 25 via a heat transfer medium pump 28. The heat transfer medium is conveyed from the heating pocket 27 via the heating line 25 to a heat exchanger 46 and from the heat exchanger 46 back to the heating pocket 27.

[0048] The combustion of fuel 24 in combustion chamber 22 produces exhaust gas, which is discharged from combustion chamber 22 via a discharge line 26. Discharge line 26 is fluidly connected to a supply line 34 of exhaust gas treatment device 30. Supply line 34 opens via an exhaust manifold 47 into a container 32 filled with a liquid, such as water, up to a liquid level. The exhaust manifold 47 is arranged below the liquid level. The exhaust gas therefore flows upwards in container 32.

[0049] Flow deflection elements 31 in the form of perforated metal sheets are arranged in the container. These elements increase the flow path of the exhaust gas toward the liquid level and thus increase the residence time of the exhaust gas in the liquid. The exhaust gas is cooled by contact with the liquid, while the liquid itself is heated.

[0050] The container 32 is fluidly connected to a circulation line 36 in which a heat exchanger 46 is arranged. The heated liquid is pumped by a circulation pump 37 via the circulation line 36 to the heat exchanger 46, where it is cooled and then flows back into the container 32.

[0051] The container 32 has a line on its underside containing a drain valve 40 for draining sedimented sludge. The sedimented sludge is composed, for example, of sedimented particles of the particulate portion of the exhaust gas and / or a condensed portion of the gas portion of the exhaust gas, which settles over time at the bottom of the container 32.

[0052] The container 32 has an outlet opening 38 on its upper side for discharging cooled exhaust gas from the container 32. The outlet opening 38 is fluidly connected to an exhaust line 48, via which the exhaust gas is discharged, for example, into the environment or fed to an exhaust aftertreatment device.

[0053] The container 32 also has an overflow opening 45 in its upper area, which is fluidly connected to a wastewater line 49. Excess liquid can be drained from the container 32 via the wastewater line 49.

[0054] A filling line 33 for filling the container 32 with the liquid is arranged on the container 32. A filling valve 35 is arranged in the filling line 33. List of reference symbols 10 Exhaust gas cooling device 20 Exhaust gas generating device 21 Supply air duct 22 Combustion chamber 23 Check valve 24 Fuel 25 heating cable 26 Derivation 27 Heating bag 28 Heat transfer pump 29 Supply air pump 30 exhaust gas treatment system 31 Flow deflection element 32 containers 33 Filling line 34 supply line 35 Filling valve 36 Circulation line 37 Circulation pump 38 Outlet opening 40 drain valve 42 Venturi nozzle 43 Widening 44 Suction line 45 Overflow opening 46 heat exchangers 47 exhaust manifold 48 exhaust pipe 49 sewer line 50 gas pump QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] WO 00 / 07699 A2

[0003]

Claims

[1] Method for cooling exhaust gas comprising the steps: a) providing fuel (24) in a combustion chamber (22), b) burning the fuel (24) so that an exhaust gas is produced, c) feeding the exhaust gas into a liquid so that the liquid is heated by the exhaust gas and the exhaust gas is cooled by the liquid, d) feeding the heated liquid into a heat exchanger (46) and / or a heat engine and e) cooling the heated liquid in the heat exchanger (46) and / or in the heat engine. [2] Method according to claim 1, characterized by that the exhaust gas is fed through a feed line (34) into a container (32) which is filled with the liquid up to a liquid level, the exhaust gas entering the container below the liquid level. [3] Method according to claim 2, characterized bythat when at least one discharge criterion is present, particle sludge is discharged from the container (32) via a discharge valve (40). [4] Method according to claim 2 or 3, characterized by that when at least one outlet criterion is present or continuously cooled exhaust gas is discharged from the container (32) via an outlet opening (38) of the container (32) which is arranged above the liquid level. [5] Method according to one of the preceding claims, characterized by that the heat exchanger (46) and / or the heat engine is arranged in a circulation line (36) and the liquid is led back into the container (32) after passing through the heat exchanger (46) and / or the heat engine. [6] Method according to one of claims 2 to 5, characterized bythat the supply line (34) is a liquid line through which the liquid is fed into the container (32), wherein the supply line (34) has a Venturi nozzle (42) with a suction line (44) via which the exhaust gas is sucked in from the combustion chamber (22) and fed into the supply line (34). [7] Method according to claim 6, characterized by that the circulation line (36) has the supply line (34). [8] Exhaust gas cooling device (10) for carrying out a method according to one of the preceding claims with a) an exhaust gas generating device (20) with i) a combustion chamber (22) for burning a fuel (24) to produce exhaust gas and ii) a discharge line (26) for discharging exhaust gas from the combustion chamber (22) and b) an exhaust gas treatment device (30) with i) a container (32) filled with a liquid up to a liquid level, ii) a supply line (34) for supplying exhaust gas into the container (32), which is fluidically connected to the outlet line (26) of the exhaust gas generating device (10), and c) a heat exchanger (46) and / or a heat engine, wherein the heat exchanger (46) and / or the heat engine is fluidly connected to the container (32). [9] Exhaust gas cooling device (10) according to claim 8, characterized by a circulation line (36) for circulating heated liquid, which is fluidly connected to the container (32) and in which the heat exchanger (46) and / or the heat engine is arranged. [10] Exhaust gas cooling device (10) according to claim 9, characterized by that the container (32) has an outlet opening (38) for discharging cooled exhaust gas from the container, which is arranged at least partially, but preferably completely, above the liquid level. [11] Exhaust gas cooling device (10) according to one of the preceding claims, characterized by a drain valve (40) for draining sedimented particle sludge from the container (32). [12] Exhaust gas cooling device according to one of the preceding claims, characterized by in that the supply line (34) is a liquid line which has a Venturi nozzle (42) with a suction line (44), wherein the suction line (44) is fluidically connected to the discharge line (26) of the exhaust gas generating device (20) and the Venturi nozzle (42) is arranged and configured to suck in the exhaust gas from the combustion chamber (22) and to feed the exhaust gas via the suction line (44) into the supply line (34). [13] Exhaust gas cooling device (10) according to claim 12, characterized by that the circulation line (36) has the supply line (34). [14] Exhaust gas treatment device (20) for an exhaust gas cooling device (10) according to one of claims 8 to 13.

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