JP6119449B2 - Exhaust gas purification device - Google Patents

Description

  The present invention relates to a technology of an exhaust gas purification device that absorbs unburned fuel components in exhaust gas discharged from a combustor such as an internal combustion engine and supplies the unburned fuel component to the combustor.

  2. Description of the Related Art Conventionally, a technique has been proposed in which unburned fuel components in exhaust gas discharged from a combustor such as an internal combustion engine, a boiler, or an industrial combustion furnace are collected and supplied to the combustor.

  For example, Patent Document 1 discloses a vehicle exhaust gas purification apparatus in which an HC trap capable of adsorbing and desorbing unburned fuel components in exhaust gas is installed in a bypass passage in the middle of an exhaust pipe provided in an internal combustion engine. ing.

  Further, for example, in Patent Document 2, a part of the exhaust gas is taken in as EGR gas from the exhaust passage of the internal combustion engine, and the EGR gas is cooled to separate the unburned fuel component and water from the condensed liquid obtained. An exhaust gas recirculation device for an internal combustion engine that recovers unburned fuel components is disclosed.

Japanese Unexamined Patent Publication No. 7-42538 JP 2009-150281 A

  However, in the apparatus of Patent Document 1, the unburned fuel component cannot be adsorbed while the unburned fuel component is desorbed, and it is difficult to efficiently recover and supply the unburned fuel component. is there. Moreover, in the apparatus of Patent Document 2, for example, when the unburned fuel component is in a gaseous state near normal temperature, it is difficult to separate and recover the unburned fuel component from water depending on the properties of the unburned fuel component. It becomes.

  Accordingly, an object of the present invention is to provide an exhaust gas purification device that can efficiently recover unburned fuel components and supply them to a combustor.

The exhaust gas purification apparatus of the present embodiment includes an absorber that absorbs unburned fuel components in exhaust gas discharged from a combustor with an absorbent, and desorbs unburned fuel components adsorbed by the absorbent from the absorbent. A desorption part for supplying the unburned fuel component to the combustor, and a circulation means for circulating and transferring the absorbent between the absorption part and the desorption part using a circulation channel; Temperature adjusting means for lowering the temperature of the absorbent in the absorbent section below the temperature of the absorbent in the desorbing section, and the temperature adjusting means, cooling means for cooling the absorbent flowing into the absorbent section, Heating means for heating the absorbent flowing into the desorption section, and the desorption section is located upstream of the absorption section with respect to the flow of exhaust gas discharged from the combustor. The heating means flows into the desorption portion using the heat of the exhaust gas. A heat exchanger for heating the absorbent.

  Further, in the exhaust gas purification device, the circulation flow path includes a first flow path for transferring the absorbent from the desorption section to the absorption section, and a transfer of the absorbent from the absorption section to the desorption section. It is preferable that the cooling means is provided in the first flow path.

Further, the exhaust gas purification apparatus of the present embodiment includes an absorber that absorbs the unburned fuel component in the exhaust gas discharged from the combustor with the absorbent, and the unburned fuel component adsorbed by the absorbent from the absorbent. A desorption part that desorbs and supplies the unburned fuel component to the combustor, and a circulation means that circulates and transfers the absorbent between the absorption part and the desorption part using a circulation channel. And a temperature adjusting means for lowering the temperature of the absorbent in the absorbent section below the temperature of the absorbent in the desorbed section, the unburned fuel component contains unburned ammonia, and the absorbent is a polar solvent. is there.

  In the exhaust gas purification apparatus, it is preferable that the circulation means includes a control means for controlling a circulation speed of the absorbent flowing through the circulation flow path according to the temperature of the absorbent in the desorption part.

  In the exhaust gas purifying apparatus, it is preferable that the absorbent is water, and the circulating means has a pump for boosting the water flowing through the second flow path.

  ADVANTAGE OF THE INVENTION According to this invention, the exhaust gas purification apparatus which can collect | recover an unburned fuel component efficiently and can supply to a combustor can be provided.

1 is a schematic overview showing an example of a configuration of an exhaust purification apparatus according to the present embodiment. It is a figure which shows the relationship between the dissolution amount of ammonia by water, and the temperature of water. It is a schematic diagram which shows an example of the other structure of the exhaust-gas purification apparatus which concerns on this embodiment. It is a schematic diagram which shows an example of the other structure of the exhaust-gas purification apparatus which concerns on this embodiment.

  Embodiments of the present invention will be described below. This embodiment is an example for carrying out the present invention, and the present invention is not limited to this embodiment.

  FIG. 1 is a schematic overview showing an example of the configuration of the exhaust gas purification apparatus according to the present embodiment. As shown in FIG. 1, the exhaust gas purification apparatus 1 includes an exhaust gas passage 10, an absorption portion 12, an exhaust gas discharge passage 14, a desorption portion 16, an unburned fuel discharge passage 18, a circulation device (circulation means). , A heating device 22, a cooling device 24, and a temperature sensor 26. The circulation device of this embodiment includes a circulation channel having a first channel 28 and a second channel 30, a circulation pump 32, and a control device 34.

  An exhaust gas passage 10 shown in FIG. 1 forms an exhaust pipe through which exhaust gas discharged from a combustor such as an internal combustion engine circulates, and is connected to the absorber 12. One end of the exhaust gas discharge channel 14 is connected to the absorber 12, and the other end is connected to another device outside the purification device system or is open to the atmosphere. One end of the first flow path 28 is connected to the absorbent outlet of the desorption part 16, and the other end is connected to the absorbent inlet of the absorption part 12, and the absorbent passes through the first flow path 28 from the desorption part 16. It is comprised so that it may introduce into absorption part 12 via. In addition, one end of the second flow path 30 is connected to the absorbent outlet of the absorption section 12, and the other end is connected to the absorbent inlet of the detachment section 16, so that the absorbent passes from the absorption section 12 to the second flow path 30. It is comprised so that it may introduce | transduce into the removal | desorption part 16 via. One end of the unburned fuel discharge flow path 18 is connected to the detachment portion 16, and the other end is connected to a fuel supply system such as an intake pipe for supplying fuel to the combustor or a fuel tank for storing fuel.

  The heating device 22 has a function of heating the absorbent that flows into the desorption part 16. The heating device 22 shown in FIG. 1 is installed so as to cover the outer periphery of the detachment part 16, but the installation location is not limited to this, for example, installed on the second flow path 30. May be. Examples of the heating device 22 include a heater, a heating jacket, or a heat exchanger through which a heating medium flows as described later. The temperature sensor 26 shown in FIG. 1 is installed in the desorption part 16 and detects the temperature of the absorbent in the desorption part 16.

  The cooling device 24 shown in FIG. 1 has a function of cooling the temperature of the absorbent flowing into the absorption unit 12. Although the cooling device 24 shown in FIG. 1 is installed in the first flow path 28, the installation location is not limited to this, and may be installed on the absorber 12, for example. From the viewpoint of the absorption efficiency of the absorbent in the absorber 12, it is preferable to install a cooling device 24 on the first flow path 28 as shown in FIG. 1. Examples of the cooling device 24 include a heat exchanger through which a cooling medium flows, a radiator such as a heat sink, and the like.

  In the present embodiment, the heating device 22 and the cooling device 24 function as temperature adjusting means for lowering the temperature of the absorbent in the absorber 12 than the temperature of the absorbent in the desorber 16. The heating device 22 and the cooling device 24 are controlled by a control signal supplied from a controller (not shown), for example. The absorbent heated by the heating device 22 is naturally cooled while being transferred from the desorption unit 16 to the absorption unit 12, and the temperature of the absorbent in the absorption unit 12 is changed to that of the absorbent in the desorption unit 16. If the temperature can be sufficiently lower than the temperature, the cooling device 24 is not necessarily installed.

  The circulation device of this embodiment includes a circulation channel having a first channel 28 and a second channel 30, a circulation pump 32, and a control device 34. The structure is not limited to the above as long as it has a function of circulating and transferring the absorbent to and from the separation portion 16. For example, a feeder or the like may be used instead of the circulation pump 32. Moreover, although the circulation pump 32 shown in FIG. 1 is installed in the 2nd flow path 30, you may install in the 1st flow path 28, for example. The control device 34 is configured by a digital circuit mainly including a microcomputer, for example, and is electrically connected to the temperature sensor 26 and the circulation pump 32. Moreover, the control apparatus 34 controls the output of the circulation pump 32 based on the temperature data of the temperature sensor 26, and adjusts the circulation speed of an absorbent.

  An absorbent is filled or injected into the circulation channel, the absorption unit 12, the desorption unit 16, and the like. The absorbent absorbs or desorbs the unburned fuel component in the exhaust gas discharged from the combustor depending on the temperature of the absorbent. For example, porous particulates such as zeolite and activated carbon, oil, etc. Nonpolar solvents, polar solvents such as water and ionic liquid, and the like can be mentioned. Here, the absorption of the unburned fuel component by the absorbent in the specification of the present application means the adsorption of the unburned fuel component by the porous granular material or the like, and the dissolution of the unburned fuel component by the nonpolar solvent or the polar solvent. .

  The absorbent is appropriately selected according to the unburned fuel component to be recovered. Examples of the unburned fuel component include gaseous components such as ammonia and hydrocarbons. When recovering ammonia as an unburned fuel component, from the viewpoint of absorption efficiency, for example, it is preferable to use water as a polar solvent as the absorbent, and in the case of hydrocarbons, for example, the absorbent is zeolite, It is preferable to use activated carbon or the like. In the case where a solvent is used as the absorbent, the circulation pump 32 is preferably used as in the present embodiment. For example, when a porous granular material is used as the absorbent, a feeder is used instead of the circulation pump 32. Is preferably used.

  The absorber 12 is configured so that the absorbent supplied into the absorber 12 and the exhaust gas discharged from the combustor are in contact with each other. For example, a nozzle or the like is installed at the absorbent inlet of the absorbent section 12 to which the first flow path 28 is connected, and the absorbent supplied from the first flow path 28 is sprayed into the absorbent section 12 through the nozzle. The absorber 12 may be configured to come into contact with the exhaust gas. In this case, in order to prevent the absorbent from being discharged from the exhaust gas discharge passage 14 together with the exhaust gas, for example, a hydrophobic porous membrane is provided at the outlet of the absorption portion 12 to which the exhaust gas discharge passage 14 is connected. It is preferable to install a filter or the like. Further, as another example, the absorbent drainage of the absorption unit 12 to which the second flow path 30 is connected from the absorbent inlet of the absorption unit 12 to which the first flow path 28 is connected is the absorption unit 12. When a hydrophobic porous membrane, a pipe formed by the membrane, or the like is installed over the outlet, and exhaust gas passing through the absorber 12 flows through the membrane or the pipe in the absorber 12 You may be comprised so that it may contact with an absorber.

  The desorbing unit 16 is configured to desorb unburned combustion components from the absorbent and separate the unburned combustion components from the absorbent. For example, when using a porous granular material or the like as the absorbent, a cyclone solid-gas separation device or the like that generates a swirling flow of the absorbent in the desorbing section 16 and separates the unburned fuel component from the absorbent. It is preferable to use it. For example, when a solvent or the like is used as the absorbent, it is preferable to use the cyclone solid-gas separation device, a degassing device using a gas-liquid separation membrane, or the like.

  Below, the relationship between the adsorption amount of the unburned fuel component by the absorbent and the temperature of the absorbent and the operation of the exhaust gas purification apparatus 1 of the present embodiment will be described.

  FIG. 2 is a graph showing the relationship between the amount of ammonia dissolved in water and the temperature of water. As shown in FIG. 2, the dissolved amount of ammonia decreases as the temperature of water increases. Therefore, by making the temperature of the absorbent in the absorption unit 12 lower than the temperature of the absorbent in the desorption unit 16, the amount of ammonia dissolved in the desorption unit 16 is reduced in the water in which the ammonia is dissolved in the absorption unit 12. Therefore, ammonia is released (desorbed) from the water at the desorbing unit 16. For example, as shown in FIG. 2, the amount of ammonia released from the desorbing unit 16 is determined by the amount of dissolution when the temperature of the absorbent in the absorption unit 12 is A and the temperature B of the absorbent in the desorption unit 16. It becomes the difference from the amount of dissolution of the absorbent at the time. It should be noted that the relationship between the amount of absorption, such as the amount of unburned fuel components adsorbed and dissolved in the absorbent, and the temperature is similar to the relationship between the amount of ammonia dissolved in water and the temperature shown in FIG. In addition to ammonia and ammonia, the present embodiment can be applied.

  Next, an example of operation | movement of the exhaust-gas purification apparatus 1 which concerns on this embodiment is demonstrated.

  First, for example, when the combustor is started, the cooling device 24, the heating device 22, the circulation pump 32, and the like are activated, and the absorbent is circulated and transferred between the absorption unit 12 and the desorption unit 16. Exhaust gas containing unburned fuel components discharged from the combustor is introduced into the absorber 12 from the exhaust gas passage 10. In addition, the absorbent passing through the first flow path 28 is cooled by the cooling device 24 and introduced into the absorption unit 12. In the absorber 12, the exhaust gas and the absorbent come into contact, and the unburned fuel component in the exhaust gas is adsorbed by the absorbent. The exhaust gas that has passed through the absorber 12 is discharged from the exhaust gas discharge passage 14 to the outside of the system. On the other hand, the absorbent that has adsorbed the unburned fuel component passes through the second flow path 30 and is introduced into the desorption part 16. The absorbent in the desorbing unit 16 is heated by the heating device 22, and the adsorbed unburned fuel component is desorbed from the absorbent. The desorbed unburned fuel component is discharged from the unburned fuel discharge flow path 18, and the absorbent is discharged from the second flow path 30.

  In this way, the temperature of the absorbent in the absorbent unit 12 is made lower than the temperature of the absorbent in the desorbed unit 16 while circulating the absorbent between the absorbent unit 12 and the desorbed unit 16, in other words, the desorbed unit. By making the temperature of the absorbent 16 higher than that of the absorbent 12, it is possible to efficiently recover the unburned fuel component in the exhaust gas discharged from the combustor and supply it to the combustor. It becomes. Furthermore, in this embodiment, in order to recover the unburned fuel component in the exhaust gas discharged from the combustor more efficiently and supply the recovered unburned fuel component to the combustor, a predetermined amount of unburned fuel is supplied. The absorbent flowing into the absorber 12 is cooled to a predetermined temperature (absorption temperature) at which the components can be absorbed, and unburned fuel components are desorbed at a temperature higher than the absorption temperature. For example, when water is used as the absorbent and ammonia is recovered as the unburned fuel component, the water flowing into the absorber 12 is cooled to 40 ° C. or lower, and the temperature of the absorbent flowing into the desorber 16 is set to 70. It is preferable to heat to above ° C.

  FIG. 3 is a schematic diagram illustrating an example of another configuration of the exhaust gas purifying apparatus according to the present embodiment. In the exhaust gas purification device 2 of FIG. 3, the same components as those of the exhaust gas purification device 1 of FIG. In the exhaust gas purification device 2 shown in FIG. 3, the desorption part 16 is arranged upstream of the absorption part 12 with respect to the flow of exhaust gas discharged from the combustor. That is, the detachment part 16 is disposed between the combustor and the absorption part 12 and is located closer to the combustor than the absorption part 12. Moreover, in the exhaust gas purification apparatus 2 shown in FIG. 3, a part of the exhaust gas flow path 10 is a heat exchanger 36 as a heating means. The desorption part 16 is installed on the exhaust gas flow path 10 (heat exchanger), and the desorption part 16 and the exhaust gas are blocked by the exhaust gas flow path 10. According to the heat exchanger 36 configured in this way, the absorbent flowing into the desorption part 16 is heated by the heat of the exhaust gas passing through the exhaust gas passage 10, and the absorbent in the desorption part 16 is heated. The temperature can be raised.

  Next, an example of the operation of the exhaust gas purification device 2 according to this embodiment will be described.

  First, for example, when the combustor is started, the cooling device 24, the circulation pump 32, and the like are activated, and the absorbent is circulated and transferred between the absorption unit 12 and the desorption unit 16. Exhaust gas containing unburned fuel components discharged from the combustor is introduced into the absorber 12 from the exhaust gas passage 10. In addition, the absorbent passing through the first flow path 28 is cooled by the cooling device 24 and introduced into the absorption unit 12. In the absorber 12, the exhaust gas and the absorbent come into contact, and the unburned fuel component in the exhaust gas is adsorbed by the absorbent. The exhaust gas that has passed through the absorber 12 is discharged from the exhaust gas discharge passage 14 to the outside of the system. On the other hand, the absorbent that has adsorbed the unburned fuel component passes through the second flow path 30 and is introduced into the desorption part 16. The absorbent in the desorption part 16 is heated by the heat of the exhaust gas passing through the heat exchanger 36 (exhaust gas flow path 10), and the adsorbed unburned fuel component is desorbed from the absorbent. The desorbed unburned fuel component is discharged from the unburned fuel discharge flow path 18, and the absorbent is discharged from the second flow path 30.

  In the present embodiment, the control device 34 controls the output of the circulation pump 32 and the like according to the temperature data of the absorbent in the desorption unit 16 detected by the temperature sensor 26, and the circulation speed of the absorbent flowing through the circulation flow path. (Flow velocity) is controlled. Here, as a method for controlling the circulation rate (flow velocity) of the absorbent according to the temperature of the absorbent in the desorbing unit 16, for example, the upper limit threshold and the lower limit threshold set in advance in the control device 34 are stored. When the controller 34 determines that the temperature data of the absorbent in the desorbing unit 16 detected by the temperature sensor 26 is equal to or lower than the lower limit threshold, the output of the circulation pump 32 is lowered to circulate the absorbent. If the speed is decreased and it is determined that the temperature data of the absorbent in the desorbing unit 16 is equal to or higher than the upper limit threshold, a method of increasing the output of the circulation pump 32 and increasing the circulation speed of the absorbent can be mentioned. . Such control suppresses, for example, the temperature of the absorbent in the desorbing unit 16 from becoming too low, so that the amount of unburned fuel components desorbed in the desorbing unit 16, and thus unburned in the absorbing unit 12. It is possible to suppress a decrease in the adsorption amount of the fuel component. Moreover, since it is suppressed that the temperature of the absorber of the detachment | desorption part 16 becomes too high, the temperature of the absorber of the absorption part 12 does not fully fall, but the adsorption amount of the unburned fuel component in the absorption part 12 falls. Can be suppressed. Further, when the absorbent is water or the like, if the temperature of the absorbent in the desorbing unit 16 is suppressed from becoming too high, the vapor pressure of water in the desorbing unit 16 increases, and the separated unburned fuel Since it is suppressed that water vapor mixes in the component, it can be easily reused in the combustor. Here, when water is used as the absorbent, it is preferable to set the upper threshold to 70 ° C. and the lower threshold to 40 ° C. Such control of the circulation rate (flow velocity) of the absorbent is particularly difficult when the heating of the desorption unit 16 is difficult to control, for example, when the heating of the desorption unit 16 is performed by heat exchange with the exhaust gas. It is valid.

  In addition, as another method for controlling the circulation rate (flow velocity) of the absorbent according to the temperature of the absorbent in the desorbing unit 16, for example, as the temperature of the absorbent in the desorbing unit 16 increases, A control map or the like specified to increase the output may be stored in the control device 34, the temperature data of the temperature sensor 26 may be applied to the control map, and the output of the circulation pump 32 may be determined.

  FIG. 4 is a schematic diagram illustrating an example of another configuration of the exhaust gas purifying apparatus according to the present embodiment. In the exhaust gas purification device 3 of FIG. 4, the same reference numerals are given to the same configurations as those of the exhaust gas purification device 2 of FIG. 3, and description thereof is omitted. In the exhaust gas purification device 3 shown in FIG. 4, the absorbent is water, the combustor is an internal combustion engine, the fuel supplied to the internal combustion engine contains ammonia, and the exhaust gas discharged from the internal combustion engine contains nitrogen oxides. The case where ammonia which is a thing and an unburned fuel component is contained is demonstrated as an example.

  In the present embodiment, a cooling device 44 is installed on the exhaust gas flow path 10 between the heat exchanger 36 that heats the desorption unit 16 and the absorption unit 12. Since the exhaust gas flowing into the absorption unit 12 is cooled by the cooling device 44, an increase in the water temperature in the absorption unit 12 can be further suppressed.

  The exhaust gas purification device 3 shown in FIG. 4 is provided with a catalyst device 38, and the exhaust gas flow path 10 is connected to the absorber 12 via the catalyst device 38. The catalyst device 38 of this embodiment mainly processes nitrogen oxides, ammonia and the like in exhaust gas. For example, a supporting body such as a honeycomb structure and a three-way catalyst supported on the supporting body, or unburned And a selective reduction catalyst using ammonia as a reducing agent. In the present embodiment, the exhaust gas discharged from the internal combustion engine is introduced into the catalyst device 38, and after nitrogen oxides and the like are purified, the exhaust gas is supplied to the absorption unit 12 and cannot be completely purified by the catalyst device 38. Ammonia in the exhaust gas is dissolved in water passing through the absorption section 12. Subsequent heating / cooling, circulation, etc. of the absorbent are as described above.

  Examples of the three-way catalyst include noble metal catalysts such as platinum (Pt), palladium (Pd), and rhodium (Rh). Examples of the selective reduction catalyst include titania-vanadium, zeolite, chromium oxide, and manganese oxide. , Molybdenum oxide, titanium oxide, tungsten oxide, and the like.

  The exhaust gas purification device 3 shown in FIG. 4 is provided with a water amount adjuster 40 and is installed in the first flow path 28. One end of a drainage channel 42 is connected to the water amount adjuster 40, and the other end of the drainage channel 42 is connected to the exhaust gas discharge channel 14. For example, when the exhaust gas is cooled by cooled water or the like flowing into the cooling device 44 or the absorption unit 12, and water vapor in the exhaust gas is condensed and mixed into the water in the absorption unit 12, Although the amount of flowing water may increase, in this embodiment, the amount of water flowing through the circulation channel is detected by the water amount regulator 40, and when the amount of water exceeds a predetermined value, the circulation channel is A part of the flowing water is drained from the drainage channel 42 to the exhaust gas discharge channel 14.

  In the exhaust gas purification device 3 shown in FIG. 4, the circulation pump 32 provided in the second flow path 30 is a high-pressure pump that boosts the water flowing through the second flow path 30 to a high pressure and pumps it to the desorption unit 16. is there. As in the present embodiment, when pressurized water is introduced into the desorption part 16 by a high-pressure pump, the ammonia gas released from the water also enters a high-pressure state. For example, the ammonia gas is pressurized. And can be introduced into a fuel supply system that is supplied to the internal combustion engine, and fuel metering becomes easy. Moreover, if pressurized water is introduced into the desorption part 16, even if the water temperature in the desorption part 16 is high, the evaporation of water can be suppressed and the water vapor concentration in the ammonia gas can be kept low. it can. From the viewpoint of suppressing water evaporation at the desorption part 16, the pressure of the water pressurized by the high-pressure pump is preferably in the range of 2 to 10 atm, for example, in the range of 3 to 5 atm. More preferred. In addition, it is considered that the pressure of the pressurized water is lowered while flowing from the desorption part 16 to the absorption part 12 via the second flow path 30.

  1-3 Exhaust gas purification device, 10 Exhaust gas flow path, 12 Absorption part, 14 Exhaust gas discharge flow path, 16 Desorption part, 18 Unburned fuel discharge flow path, 22 Heating device, 24, 44 Cooling device, 26 Temperature Sensor, 28 1st flow path, 30 2nd flow path, 32 Circulation pump, 34 Control apparatus, 36 Heat exchanger, 38 Catalyst apparatus, 40 Water quantity regulator, 42 Drain flow path.

Claims (5)

An absorber that absorbs unburned fuel components in the exhaust gas discharged from the combustor with an absorbent;
A desorption part for desorbing unburned fuel components adsorbed by the absorbent from the absorbent and supplying the unburned fuel components to the combustor;
Circulation means for circulating and transferring the absorbent between the absorption part and the desorption part using a circulation channel;
Temperature adjusting means for lowering the temperature of the absorbent in the absorbent section below the temperature of the absorbent in the desorbed section ,
The temperature adjusting means includes a cooling means for cooling the absorbent flowing into the absorption section, and a heating means for heating the absorbent flowing into the desorption section,
The desorption part is located upstream of the absorption part with respect to the flow of exhaust gas discharged from the combustor,
The exhaust gas purification apparatus , wherein the heating means is a heat exchanger that heats the absorbent flowing into the desorption section using heat of the exhaust gas. An absorber that absorbs unburned fuel components in the exhaust gas discharged from the combustor with an absorbent;
A desorption part for desorbing unburned fuel components adsorbed by the absorbent from the absorbent and supplying the unburned fuel components to the combustor;
Circulation means for circulating and transferring the absorbent between the absorption part and the desorption part using a circulation channel;
Temperature adjusting means for lowering the temperature of the absorbent in the absorbent section below the temperature of the absorbent in the desorbed section,
The unburned fuel component comprises unburned ammonia, exhaust gas purification device you characterized in that the absorbing agent is a polar solvent. The circulation flow path has a first flow path for transferring the absorbent from the desorption section to the absorption section, and a second flow path for transferring the absorbent from the absorption section to the desorption section. And
It said cooling means, the exhaust gas purifying apparatus according to claim 1, characterized in that provided in the first flow path. The said circulation means is equipped with the control means which controls the circulation speed of the absorber which flows through the said circulation flow path according to the temperature of the absorber in the said desorption part, The any one of Claims 1-3 characterized by the above-mentioned. The exhaust gas purifying device according to item. The absorbent is water;
The exhaust gas purifying apparatus according to claim 3 , wherein the circulating means includes a pump for boosting the water flowing through the second flow path.

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