JP2009293439A - Exhaust heat recovery device, exhaust emission control system, and method for manufacturing exhaust heat recovery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust heat recovery device simple in a structure, easy to be manufactured, and capable of surely transmitting heat of exhaust gas at a downstream side to exhaust gas at an upstream side, and emission control system capable of surely transmitting heat generated by the exhaust emission treatment device disposed in an exhaust gas passage of an internal combustion engine or the like, to exhaust gas at the upstream side by using the exhaust heat recovery device. <P>SOLUTION: Holes 51a, 52a for exhaust gas passage are provided on a flat plate or corrugated plate first plate shape member 51 having high thermal conductivity and a corrugated second plate shape member 52 having high thermal conductivity. A front core part 11 and a rear core part 12 having a core structure concentrically winding the plate shape members 51, 52, and a gas shut off member 13 put therebetween are stored in a tubular case 14. The first gas inlet 15 and a first gas outlet 16 are provided at an axial direction end part of the case 14. A second gas outlet 17 is provided at an outer circumference side of the front core part 11 and the second gas inlet 18 is provided at outer circumference side of the rear core part 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an exhaust heat recovery device for transferring heat generated in an exhaust gas processing device such as a catalyst disposed in an exhaust gas passage of an internal combustion fuel engine or the like from the exhaust gas processing device to the upstream side, and the exhaust heat recovery The present invention relates to an exhaust gas purification system including an apparatus and a method for manufacturing an exhaust heat recovery apparatus.

  In an engine in which an exhaust gas purifying catalyst is installed in an exhaust pipe, the exhaust gas temperature may be higher on the catalyst outlet side than on the catalyst inlet side due to heat generated in the catalyst. On the other hand, since the temperature of the exhaust gas purifying catalyst is relatively low at about 200 ° C. in a diesel engine when traveling in an urban area, the catalytic activity is increased and the exhaust gas purifying efficiency is improved by setting the catalyst to a higher temperature. However, in the configuration of the conventional exhaust gas purification system, even if the temperature of the exhaust gas rises due to heat generation in the catalyst, this heat is discharged into the atmosphere without using it.

  In this connection, in order to efficiently raise and maintain the temperature of the catalyst, heat on the exhaust downstream side is recovered between the exhaust pipe upstream of the PM filter and the exhaust downstream pipe. There has been proposed an exhaust gas purification apparatus for an internal combustion engine that is provided with a heat exchanger that stores heat and transfers the stored heat to exhaust gas upstream of the exhaust gas (see, for example, Patent Document 1).

However, this heat exchanger is a rotary heat storage type heat exchanger, and since heat storage time and heat dissipation time are alternately present, heat transfer is intermittent, and the PM filter front and rear pipes are connected to the heat exchanger. In addition, a large space is required, and a portion where the pipe is bent increases, resulting in an increase in pipe resistance. In addition, the rotary heat storage type heat exchanger is difficult to manufacture, is expensive, and has a problem that the reliability of the apparatus is lowered because the apparatus is driven to rotate.
JP 2002-38935 A

  The present invention has been made in view of the above situation, and an object of the present invention is to provide exhaust heat that has a simple structure, is easy to manufacture, and can reliably transfer the heat of the exhaust gas on the downstream side to the exhaust gas on the upstream side. Exhaust gas purification that can reliably transfer the heat generated by the exhaust gas processing device such as a catalyst disposed in the exhaust gas passage of an internal combustion engine or the like to the exhaust gas on the upstream side using the recovery device and the exhaust heat recovery device To provide a system.

  An exhaust heat recovery apparatus for achieving the above object recovers heat generated in an exhaust gas processing apparatus that generates heat during at least one exhaust gas processing, and uses the recovered heat to the exhaust gas processing apparatus. In the exhaust heat recovery device that transmits the exhaust gas upstream, each of the first plate-like member composed of a flat plate or corrugated plate with high thermal conductivity and the second plate-like member formed of corrugated plate with high thermal conductivity A front core portion and a rear core portion of a core structure formed by providing holes for exhaust gas passage and overlapping the first plate member and the second plate member and concentrically winding them, both A gas blocking member sandwiched between the two is housed in a cylindrical case, and a first gas inlet and a first gas outlet are provided at an axial end of the case, and the front portion of the case A second exhaust gas flows in the direction intersecting the axial direction on the outer peripheral side of the core portion. The scan outlet provided on an outer peripheral side of the rear core part of the case and configured by providing a second gas inlet flowing direction in the exhaust gas crossing the axial direction of the case.

  This high thermal conductivity means a thermal conductivity equivalent to that of a metal, and preferably has a thermal conductivity of 15 to 450 W / m · K (12.9 to 387 kcal / mh ° C.) at 20 ° C. In addition, the case serving as the outer cylinder is a structure having four openings in total, two on the both ends and two sides provided corresponding to the core structure divided into two, and the case is concentric. A front core portion and a rear core portion of a core-like core structure are inserted and arranged to form an exhaust heat recovery device.

  According to this configuration, the exhaust gas processing device that generates heat from the rear core portion through which the exhaust gas downstream of the exhaust gas processing device that generates heat passes by the first and second plate members having high thermal conductivity. Heat can be reliably transmitted to the front core portion through which the exhaust gas on the upstream side passes. In addition, the structure of the exhaust heat recovery device is simple and easy to manufacture, and since there is no drive part, there are few failures and the reliability of the device is high.

  In the above exhaust heat recovery apparatus, a catalyst is supported on at least one of the front core portion and the rear core portion. As a result, at least one of the front core portion and the rear core portion can be used as a catalyst device for exhaust gas treatment. For example, when used as an oxidation catalyst (DOC), a noble metal catalyst is coated.

  In the exhaust heat recovery apparatus, the gas shielding member is located between the first plate member and the second plate member at a position avoiding the hole of the first plate member formed of a flat plate. The second plate-like member is divided into a front part and a rear part, and is corrugated with the first plate-like member and the second plate-like member, It is formed of a core member having the same height.

  This structure is an application of a core structure in which a flat plate made of stainless steel foil and a corrugated plate are overlapped and wound concentrically, and is divided into two in the front and back by a flat plate with a hole and a corrugated plate with a hole. A core structure such as a core wire, a flat bar, or a wire having the same height as the corrugated sheet is disposed between the two corrugated sheets, and the core structure is wound concentrically. The core member, the first plate member, and the second plate member can be joined by brazing, welding, welding, or the like.

  According to this configuration, the first plate-like member communicates, and the second plate-like member becomes the front core portion and the rear core portion that are divided into two by the core wire that is the gas shielding member. Heat can be reliably and efficiently transferred by the member. In addition, if the core wire of the gas shielding member is also formed of a material having a high thermal conductivity such as a metal, it can efficiently conduct heat even through the second plate member and the gas shielding member.

  Alternatively, in the above exhaust heat recovery apparatus, the gas shielding member is formed of a disk-like plate-like member and is provided between the front core portion and the rear core portion. According to this structure, manufacture becomes remarkably easy. The gas shielding member, the front core portion, and the rear core portion can be joined by brazing, welding, welding, or the like.

  An exhaust gas purification system for achieving the above object recovers heat generated in an exhaust gas processing device that generates heat during at least one exhaust gas processing, and uses the recovered heat upstream of the exhaust gas processing device. In the exhaust gas purification system that transmits the exhaust gas to the exhaust gas, the exhaust heat recovery device is provided.

  According to this configuration, the front part through which the exhaust gas on the upstream side of the heat generating exhaust gas processing apparatus passes from the rear core part through which the exhaust gas on the downstream side of the exhaust gas processing apparatus that generates heat passes through with a relatively simple structure. Heat can be reliably transferred to the core portion.

  In the exhaust gas purification system, the exhaust gas processing device that generates heat is disposed between the second gas outlet and the second gas inlet of the exhaust heat recovery device, and the exhaust gas is recovered into the exhaust heat recovery. It flows into the exhaust gas processing device via the first gas inlet, the front core portion, and the second gas outlet of the device, and further, the second gas inlet and the rear core of the exhaust heat recovery device. Configured to flow via the first gas outlet.

  According to this configuration, heat transfer is reliably performed from the rear core portion through which the exhaust gas downstream of the heat generating exhaust gas processing device passes to the front core portion through which the exhaust gas upstream of the heat generating exhaust gas processing device passes. Can be done.

  Alternatively, in the exhaust gas purification system of the upper air, the exhaust gas processing device that generates heat is formed by the rear core portion of the exhaust heat recovery device. This can be formed by loading a catalyst on the rear core part or packing a material capable of collecting PM. According to this configuration, since the exhaust gas processing device and the exhaust heat recovery device are combined, the exhaust gas purification system can be simplified.

  As the exhaust gas treatment device in the above exhaust heat recovery device and exhaust gas purification system, an oxidation catalyst device (DOC), a selective reduction catalyst device (SCR), a NOx occlusion reduction type catalyst device (LNT), a filter device with a catalyst ( CSF), a filter device not supporting a catalyst (DPF), a hydrocarbon storage catalyst device (HC trap), or a combination thereof.

  The method for manufacturing the exhaust heat recovery apparatus of the present invention is a concentric structure in which a first plate member that is a metal perforated flat plate and a second plate member that is a metal perforated corrugated plate are laminated. When it is wound, it is divided into two in the axial direction when the second plate member is wound, and a core member having the same height as the second plate member is disposed between the two second plate members. Then, the first plate member, the second plate member and the core member are concentrically wound to form a cylindrical core structure, and the core member, the first plate member and the second plate member are formed. The member 52 is joined, and after joining, the core member, the first plate-like member, and the second plate-like member 52 are accommodated in a case serving as an outer cylinder, and the axial direction of the two front and rear ends and the outer cylinder side surface In addition to the above two locations, openings are provided at four locations, and the core structure is inserted and fixed in this case. According to this manufacturing method, the exhaust heat recovery apparatus can be easily manufactured by a relatively simple process.

  According to the exhaust heat recovery apparatus and the exhaust gas purification system according to the present invention, the exhaust gas on the downstream side of the exhaust gas processing apparatus that generates heat passes through the first plate member and the second plate member having high thermal conductivity. Heat can be reliably transmitted from the rear core portion to the front core portion through which the exhaust gas upstream of the exhaust gas processing device that generates heat passes. In addition, the structure of the exhaust heat recovery device is simple and easy to manufacture, and since there is no drive part, there are few failures and the reliability of the device is high.

  Moreover, according to the manufacturing method of the exhaust heat recovery apparatus which concerns on this invention, an exhaust heat recovery apparatus can be manufactured easily by a comparatively simple process.

  Hereinafter, an exhaust heat recovery device, an exhaust gas purification system, and a method of manufacturing an exhaust heat recovery device according to embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the exhaust heat recovery device 10 recovers heat generated in the exhaust gas processing device that generates heat during exhaust gas processing, and the recovered heat is exhausted to the exhaust gas G upstream of the exhaust gas processing device. It is a device to transmit to. The exhaust heat recovery apparatus 10 houses a rear core portion 12 of the core structure similar to the front core portion 11 of the core structure, and a gas blocking member 13 sandwiched between the two in a cylindrical case 14. Composed.

  A front inlet (first gas inlet) 15 and a rear outlet (first gas outlet) 16 are provided at the end of the case 14 in the axial direction (the direction in which the core of the core structure extends). A front outlet (second gas outlet) 17 through which exhaust gas G flows in a direction intersecting the axial direction of the case 14 is provided on the outer peripheral side of the core portion 11, and a case is provided on the outer peripheral side of the rear core portion 12 of the case 14. The rear inlet (second gas inlet) 18 through which the exhaust gas G flows is provided in a direction intersecting with the axial direction of 14.

  That is, the case 14 serving as the outer cylinder has four openings 15, 16, 17, including two places at both ends and two places on the side surfaces provided corresponding to the core parts 11, 12 divided into two parts. In this case 14, the front core portion 11 and the rear core portion 12 of the concentric core structure are arranged with the gas shielding member 13 interposed therebetween.

  Next, a method for manufacturing the exhaust heat recovery apparatus 10 will be described. As shown in FIG. 2, the core structure of the front core portion 11 and the rear core portion 12 includes a first plate member 51 that is a metal perforated flat plate and a second plate that is a metal perforated corrugated plate. It is possible to use a structure in which the shaped members 52 are stacked so that the channels 53 can flow. The wave pitch of the second plate-like member 52 is shaped to about 1 mm, for example. Moreover, as the diameter of the holes 51a and 52a, various sizes from those smaller than 1 mm to those close to 10 mm can be used.

  As the plate-like members 51 and 52, for example, a stainless thin plate having a thickness of 30 μm to 50 μm is used so as to withstand the high heat of the exhaust gas. This stainless steel sheet is generally used as a metal carrier catalyst, and has a thermal conductivity of 16 W / mK to 21 W / mK (14 kcal / mh ° C. to 18 kcal / mh ° C.). As the plate-like members 51 and 52, a material having a high thermal conductivity is preferable, and a metal material that can be easily processed is preferable. .

  This flat first plate member 51 and corrugated second plate member 52 are laminated in a concentric shape to form a cylindrical shape, but as shown in the developed view of FIG. After the second plate-like member 52 is divided into two in the axial direction at the time of winding, the core wire 13a which is a core member having the same height as the corrugated plate 52 is disposed between the two corrugated plates 52, 52. . The core wire 13a is joined to the first plate member 51 and the second plate member 52 by brazing, welding, welding, or the like. FIG. 4 shows the laminated state of the flat first plate member 51 and the corrugated second plate member 52, and FIG. 5 shows the arrangement of the core wires 13a. A flat bar or a wire may be used instead of the core wire.

  In this state, the first plate member 51, the second plate member 52, and the core wire 13a are wound concentrically to form a core structure as shown in FIG. At this time, assuming that the core length L when rolled up is Lf, the width of the flat plate is Lf, the width of the corrugated plate is Lw1, Lw2, and the width of the core wire is B, L = Lf = Lw1 + B + Lw2. After winding up, the flat first plate member 51 and the corrugated second plate member 52 are combined around the core wire 13a and fixed by brazing.

  The cylindrical front core part 11 and rear core part 12 are inserted into a case 14 which is a steel outer cylinder and brazed. As shown in FIG. 1, the case 14 includes two positions at the front and rear ends of the case 14 that are the same as the opening in a general catalyst structure, and two axial positions on the side surface of the outer cylinder peculiar to this time. Four openings 15, 16, 17, 18 are provided and formed. The front outlet 17 and the rear inlet 18, which are side openings, are respectively divided into two parts of the front core part 11 and the rear core part 12 formed by corrugated second plate-like members 15 wound around. The case 11 is formed at a portion corresponding to the vicinity of the center in the axial direction. Thereby, the exhaust heat recovery apparatus 10 is completed.

  According to the core structure manufactured by this manufacturing method, the first plate-like member 51 communicates and the second plate-like member 52 is divided into two by the core wire 13a that is the gas shielding member 13, and the rear core portion 11 and the rear portion. Since it becomes the core part 12, it can transmit heat reliably and efficiently by the 1st plate-shaped member 51 which connected. Further, if the core wire 13a of the gas shielding member 13 is formed of a material having a high thermal conductivity such as a metal, it is possible to conduct heat efficiently through the second plate-like member 52 and the gas shielding member 13.

  Moreover, as another manufacturing method of the core structure as shown in FIG. 6, the gas shielding member 13 is formed of a disk-shaped plate-like member, and the front core portion 11 and the rear portion of the core structure formed as separate bodies, respectively. It is provided between the core portions 12 and configured. According to this structure, manufacture becomes remarkably easy. The gas shielding member 13, the front core portion 11, and the rear core portion 12 are joined by brazing, welding, welding, or the like. Also with this configuration, if the joining is performed in a state where heat conduction is good, the front core portion 11 through which the low-temperature exhaust gas on the upstream side passes from the rear core portion 12 through which the high-temperature exhaust gas on the downstream side passes. Heat transfer can be reliably performed.

  Note that at least one of the front core portion 11 and the rear core portion 12 is formed by coating a catalyst. For example, when used as an oxidation catalyst (DOC), a noble metal catalyst is coated. As a result, this portion can be used as a catalyst device for exhaust gas treatment.

  In the exhaust heat recovery apparatus 10 having the above-described configuration, as shown in FIG. 1, the exhaust gas G that has flowed into the front inlet 15 is rearward by the gas shielding member 13 at the boundary between the front core portion 11 and the rear core portion 12. Since the flow in the direction of the outlet 16 is interrupted, it passes through the holes 51a and 52a provided in the first plate-like member 51 of the flat plate and the second plate-like member 52 of the corrugated plate and flows out to the front outlet 17. Similarly, exhaust gas flowing from the rear inlet 18 is discharged from the rear outlet 15. The reverse flow is the same.

  Next, an exhaust gas purification system using the above exhaust heat recovery apparatus 10 will be described. As shown in FIGS. 7 and 8, the exhaust gas purification system 1 is connected to an exhaust pipe (not shown) so that the exhaust gas G of the engine (internal combustion engine) flows into the front inlet 15. Further, exhaust gas purification treatment devices 19 and 20 (two in FIG. 7 and FIG. 8) that generate heat during the exhaust gas treatment are provided between the front outlet 17 and the rear inlet 18 as appropriate. The pipe 21 is used for connection. Further, if necessary, an exhaust pipe (not shown) provided with an exhaust silencer pipe (not shown) is connected to the rear outlet 16 so that the purified exhaust gas Gc is discharged into the atmosphere.

  That is, the exhaust gas processing devices 19 and 20 that generate heat are disposed between the front outlet 17 and the rear inlet 18 of the exhaust heat recovery device 10, and the exhaust gas G is transferred to the front inlet 15 of the exhaust heat recovery device 10. The exhaust gas treatment devices 19 and 20 flow into the exhaust gas treatment devices 19 and 20 via the front core portion 11 and the front outlet 17, and further pass through the rear inlet 18, the rear core portion 12, and the rear outlet 15 of the exhaust heat recovery device 10. To flow.

  Further, when an exhaust gas treatment device that generates heat in the rear core portion 12 by forming a catalyst on the rear core portion 12 of the exhaust heat recovery device 10 or packing a material that can collect PM is formed, Since the exhaust gas treatment device and the exhaust heat recovery device 10 are combined, the exhaust gas purification system can be simplified.

  The exhaust gas treatment devices 19 and 20 that generate heat include an oxidation catalyst device (DOC), a selective reduction catalyst device (SCR), a NOx occlusion reduction catalyst device (LNT), a filter device with catalyst (CSF), and a catalyst. One or some combination of an unsupported filter device (DPF) and a hydrocarbon storage catalyst device (HC trap) is conceivable.

  According to the exhaust gas purification apparatus 10 having the above-described configuration, the exhaust gas G on the downstream side of the exhaust gas processing apparatuses 19 and 20 that generate heat is generated by the first plate member 51 and the second plate member 52 having high thermal conductivity. Heat can be reliably transferred from the passing rear core portion 12 to the front core portion 11 through which the exhaust gas G upstream of the exhaust gas processing devices 19 and 20 that generate heat passes. In addition, the structure of the exhaust heat recovery device 10 is simple and easy to manufacture, and since there is no drive part, there are few failures and the reliability of the device is increased.

  Further, according to the exhaust gas purification system 1 having the above-described configuration, hydrocarbon (HC) or carbon monoxide (CO) is contained in the exhaust gas G flowing into the exhaust heat recovery device 10 and the exhaust gas treatment devices 19 and 20. When there is a component that generates heat by such a catalytic reaction, the temperature of the exhaust gas G flowing out from the exhaust gas processing devices 19 and 20 becomes higher than the temperature of the exhaust gas G flowing in.

  Therefore, in the exhaust heat recovery apparatus 10, the portion of the rear core portion 12 that extends from the rear inlet 18 to the rear outlet 16 is more than the portion of the front core portion 11 that extends from the front inlet 15 to the front outlet 17. You will be exposed to high temperature exhaust gas. The front core portion 11 and the rear core portion 12 of the exhaust heat recovery apparatus 10 are configured so that heat transfer by heat conduction is high with a first plate member such as a single metal flat plate, and heat transfer is performed. Since it is very good, the heat flow of the black arrow H is made toward the front core part 11 exposed to the low temperature exhaust gas from the rear core part 12 exposed to the higher temperature exhaust gas.

  As a result, the temperature of the front core portion 11 is higher than that of the inflowing exhaust gas G, so that the temperature of the inflowing exhaust gas G can be increased. That is, the heat (exhaust heat) of the exhaust gas G that has risen due to heat generation in the exhaust gas processing devices 19, 20 is recovered from the exhaust gas processing devices 19, 20 and flows into the exhaust gas processing devices 19, 20. Can be given to gas.

  Therefore, the exhaust gas G upstream of the exhaust gas processing devices 19 and 20 that generates heat from the rear core section 12 through which the exhaust gas G downstream of the heat generating exhaust gas processing devices 19 and 20 passes has a relatively simple configuration. Heat can be reliably transferred to the front core portion 11 through which the gas passes.

  Moreover, according to the manufacturing method of the exhaust heat recovery apparatus which concerns on this invention, an exhaust heat recovery apparatus can be manufactured easily by a comparatively simple process.

  In addition, according to the exhaust gas purification system which concerns on this invention, although it depends on a condition, it is thought that the temperature rise of about 150 to 300 degreeC can be anticipated as a raise of inflow exhaust gas temperature. On the other hand, the exhaust temperature of diesel engine vehicles in out-of-city driving is about 200 ° C., and the temperature at which many catalyst activities begin to be exhibited is in this temperature range. Therefore, if there is a temperature rise of at least about 50 ° C. to 100 ° C., the catalyst can be used in a temperature range where the activity of the catalyst is good. Therefore, by adopting the exhaust gas purification system of the present invention, the catalyst is made higher. The temperature can be maintained, and the purification rate of the catalyst can be greatly improved.

It is a figure which shows typically the structure of the exhaust-gas purification apparatus of embodiment which concerns on this invention. It is a figure which shows typically the overlap structure of a perforated flat plate and a perforated corrugated plate. It is a figure which shows typically a mode that the core structure was expand | deployed. It is an enlarged view of A part of FIG. FIG. 4 is an enlarged view of a portion B in FIG. 3. It is a figure which shows typically the structure of a front part core part, a rear part core part, and a gas shielding member. 1 is a perspective view schematically showing a configuration of an exhaust gas purification system according to an embodiment of the present invention. 1 is a side sectional view schematically showing a configuration of an exhaust gas purification system according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust gas purification system 10 Waste heat recovery apparatus 11 Front core part 12 Rear core part 13 Gas cutoff member 13a Core wire (core member)
14 Case 15 Front inlet (first gas inlet)
16 Rear outlet (first gas outlet)
17 Front outlet (second gas outlet)
18 Rear inlet (second gas inlet)
19, 20 Exhaust gas purification treatment device 21 U-shaped pipe 51 First plate member 51a, 52a Hole 52 Second plate member 53 Channel G Exhaust gas Gc Purified exhaust gas

Claims (8)

In the exhaust heat recovery device that recovers heat generated in the exhaust gas processing device that generates heat during at least one exhaust gas processing, and transmits the recovered heat to the exhaust gas upstream of the exhaust gas processing device,
Exhaust gas passage holes are provided in each of the first plate member formed of a high thermal conductivity flat plate or corrugated plate and the second plate member formed of a high thermal conductivity corrugated plate. A cylindrical core member and a second plate-like member, which are formed by concentrically winding a front core part and a rear core part of a core structure, and a gas blocking member sandwiched between the two. Contained in a case,
A first gas inlet and a first gas outlet are provided at the axial end of the case, and a second gas outlet through which exhaust gas flows in a direction intersecting the axial direction on the outer peripheral side of the front core portion of the case And a second gas inlet through which exhaust gas flows in a direction intersecting the axial direction of the case is provided on the outer peripheral side of the rear core portion of the case.   The exhaust heat recovery apparatus according to claim 1, wherein a catalyst is supported on at least one of the front core portion or the rear core portion.   In the position where the gas shielding member avoids the hole of the first plate member formed of a flat plate, the second plate member is interposed between the first plate member and the second plate member. Formed by a core member having the same height as the corrugated plate of the second member, which is divided into a front part and a rear part and is wound concentrically with the first plate member and the second plate member. The exhaust heat recovery apparatus according to claim 1 or 2, wherein   3. The exhaust heat recovery apparatus according to claim 1, wherein the gas shielding member is formed of a disk-like plate-like member and is provided between the front core portion and the rear core portion.   An exhaust gas purification system that recovers heat generated in an exhaust gas processing device that generates heat during at least one exhaust gas processing, and transmits the recovered heat to exhaust gas upstream of the exhaust gas processing device. An exhaust gas purification system comprising the exhaust heat recovery device according to claim 1, 2, 3 or 4.   The exhaust gas treatment device that generates heat is disposed between the second gas outlet and the second gas inlet of the exhaust heat recovery device, and the exhaust gas is the first gas inlet of the exhaust heat recovery device, It flows into the exhaust gas processing device via the front core portion and the second gas outlet, and further, the second gas inlet, the rear core portion, and the first gas outlet of the exhaust heat recovery device The exhaust gas purification system according to claim 5, wherein the exhaust gas purification system is configured to flow through.   6. The exhaust gas purification system according to claim 5, wherein the exhaust gas processing device that generates heat is formed by the rear core portion of the exhaust heat recovery device.   A method of manufacturing an exhaust heat recovery apparatus, in which a first plate member that is a metal perforated flat plate and a second plate member that is a metal perforated corrugated plate are stacked concentrically. The second plate member is divided into two in the axial direction when it is wound, and a core member having the same height as the second plate member is disposed between the two second plate members, The first plate member, the second plate member, and the core member are concentrically wound to form a cylindrical core structure, and the core member, the first plate member, and the second plate member 52, After the joining, the core member, the first plate-like member, and the second plate-like member 52 are housed in a case serving as an outer cylinder, and two places on the front and rear ends and two places in the axial direction on the side surface of the outer cylinder. In addition, the exhaust heat recovery device is characterized in that openings are provided at four locations, and the core structure is inserted and fixed in this case. Manufacturing method.

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