JP5402555B2 - Catalyst warm-up device and catalyst warm-up system with catalyst warm-up device - Google Patents

Description

  The present invention relates to a catalyst warm-up device and a catalyst warm-up system including the catalyst warm-up device.

  As a type of catalyst warm-up device, the one shown in Patent Document 1 is known. As shown in FIG. 3 of Patent Document 1, the catalyst warm-up device is provided in the middle of an exhaust pipe (first exhaust pipe) through which exhaust gas discharged from an engine (combustion apparatus) flows. A catalyst ceramic part 14 (first catalyst part) made of a catalyst for purifying gas, and a heat storage material which is provided in contact with the catalyst ceramic part 14 (first catalyst part) and generates heat by chemically reacting with water (liquid) And a chemical reaction heat storage device 15 (heat storage device) filled with 17 (heat storage material). This catalyst warm-up device causes a reversible reaction after warming-up with a water conduit 19 for supplying water 18 to generate heat in the heat storage material 17 when cold, and releases water as water vapor 20 to the outside after the reaction. A steam discharge port 21 is provided.

  According to such a configuration, it is necessary to separately provide a water supply device (including a water tank and a pump) for supplying water, the catalyst warm-up device itself becomes large, and the catalyst warm-up system also becomes large. Turn into. In addition, it is necessary to replenish water, and the convenience deteriorates.

  For such a problem, the one disclosed in Patent Document 2 is known. As shown in FIG. 1 of Patent Document 2, the chemical heat storage system for a vehicle uses engine heat (exhaust gas heat) as vehicle waste heat, and a high temperature reaction material 19 that performs a chemical heat storage reaction using engine heat as reaction heat. Is stored in the reactor 8. The reactor 8 communicates with the reactor 8 via the communication passage 10, and when the reactor 8 is heated by the engine heat, when the endothermic reaction occurs in the high temperature reaction material 19 and the gas medium is released, the reactor 8 is caused by the pressure difference. And a condenser 9 for condensing the gas medium that has moved from. In addition, when the third valve 6 is opened at the time of heat dissipation using the stored heat, the reactor 8 is heated at a high temperature by an exothermic reaction between the gas medium moved from the condenser 9 due to the pressure difference and the reactant of the high temperature reactant 19. Is supposed to generate.

JP 59-208118 A JP 2009-57933 A

  If the technology for communicating the reactor 8 and the condenser 9 described in Patent Document 2 through the communication path 10 provided with the third valve 6 is applied to the catalyst warm-up device described in Patent Document 1, Although convenience is improved, since the third valve exists, there is a demand for further downsizing of the catalyst warm-up device itself and further downsizing of the catalyst warm-up system. In Patent Document 2, when heat is radiated in the reactor 8, the gas medium (water vapor) moves from the condenser 9 to the reactor 8 due to a pressure difference caused by opening the third valve 6. The amount of water vapor supplied may be insufficient. In this case, there was a possibility that the heat radiation in the reactor 8 would not be sufficiently high.

  The present invention has been made to solve the above-described problems. In the catalyst warm-up device and the catalyst warm-up system, the heat storage device maintains a sufficiently high heat dissipation, and the device itself and thus the entire system is downsized. With the goal.

  In order to solve the above problems, the structural feature of the invention according to claim 1 is a catalyst provided in the middle of the first exhaust pipe through which the exhaust gas discharged from the combustion device circulates to purify the exhaust gas. In the catalyst warm-up device, comprising: a first exhaust pipe that includes a first catalyst portion; and a heat storage device that is provided in contact with the first catalyst portion and that is charged with a heat storage material that chemically reacts with a liquid and generates heat. Between the inner cylinder in which the first catalyst part and the heat storage device are housed and which is provided in the middle, and is coaxially disposed to cover the inner cylinder and along the axial direction. An outer cylinder having an outer space formed and connected to the first exhaust pipe at one end and closed at the other end; a communication hole communicating the inner space and the outer space formed in the inner cylinder; and the outer cylinder Evaporates by heating the liquid inside and is in airtight communication with the heat storage device. Evaporative condensing device that condenses the gas supplied from the heated heat storage device and condenses the gas supplied to the heat storage device to generate a liquid and stores it inside. When the evaporative condenser is heated without flowing through, and the evaporation condenser is heated, then flows into the inner space through the communication hole, flows out through the first catalyst unit and the heat storage device, and on the other hand, the heat storage device stores heat, The exhaust gas is configured to flow into the inner space and flow out through the first catalyst unit and the heat storage device.

  A structural feature of the invention according to claim 2 is that, in claim 1, the first catalyst section and the heat storage device are disposed inside the evaporation condensing device.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the outer space is provided with a return flow path for introducing the exhaust gas and leading the exhaust gas from the communication hole. The return channel is disposed inside the evaporative condenser.

  A structural feature of the invention according to claim 4 is that, in any one of claims 1 to 3, the communication hole is provided in an upstream portion related to the exhaust gas of the inner cylinder.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the evaporative condensing device surrounds an outer cylinder disposed so that the axial direction is along the horizontal direction. The first water storage section that is disposed coaxially and is provided in the upper part of the evaporative condensation apparatus and stores liquid, the second water storage section that is provided in the inner side part of the evaporative condensation apparatus and stores liquid, and the evaporative condensation And a third water storage section that is provided at the inner bottom of the apparatus and stores liquid.

  According to a sixth aspect of the present invention, the evaporative condensing device according to the fifth aspect of the present invention includes an inner peripheral wall that contacts the outer cylinder, an inner peripheral wall, and an outer peripheral wall disposed with a space therebetween. The first water reservoir is composed of at least a groove formed by a rib interposed between the inner peripheral wall and the outer peripheral wall, and the second water reservoir is interposed between the inner peripheral wall and the outer peripheral wall and is The third water storage part is constituted by a groove formed by a rib interposed between the inner peripheral wall and the outer peripheral wall.

  A structural feature of the invention according to claim 7 is that the catalyst warm-up device according to any one of claims 1 to 6 and the catalyst warm-up device provided in parallel with the first exhaust pipe are bypassed. And a second catalyst comprising a catalyst for purifying the exhaust gas provided in the first exhaust pipe downstream of the exhaust gas flow from the confluence of the first exhaust pipe and the second exhaust pipe A part.

  In the invention according to claim 1 configured as described above, the inner cylinder is provided in communication with the middle of the first exhaust pipe, and is provided with a first catalyst part and a heat storage device (in contact with the first catalyst part). The heat storage material which is provided and generates heat by chemically reacting with the liquid is housed inside. The outer cylinder includes an outer space that is coaxially disposed to cover the inner cylinder, is formed along the axial direction with the inner cylinder, is connected to the first exhaust pipe at one end, and is closed at the other end. Yes. The inner space and the outer space formed in the inner cylinder communicate with each other through a communication hole. The evaporative condensing device is provided in contact with the outer cylinder and is hermetically communicated with the heat storage device, and is vaporized by heating the liquid inside and supplied to the heat storage device, while the gas supplied from the heated heat storage device Is condensed to produce liquid and stored inside. When the heat storage device dissipates heat, the exhaust gas flows into the outer space without passing through the inner space, heats the evaporative condensing device, and then flows into the inner space through the communication hole so that the first catalyst unit and the heat storage device are On the other hand, when the heat is stored in the heat storage device, the exhaust gas flows into the inner space and flows out through the first catalyst unit and the heat storage device.

  Therefore, when warming up the first catalyst unit, the relatively low temperature exhaust gas from the combustion device flows into the outer space without passing through the inner space, heats the evaporative condensing device, and heats the liquid inside the evaporative condensing device. Thus, it is evaporated and supplied to the heat storage device, and the heat storage material and the liquid react chemically to generate heat and dissipate heat. The heat causes the first catalyst portion that contacts the heat storage device to be heated. The exhaust gas after the heat exchange by the evaporative condensing device flows into the inner space through the communication hole, is heated by the first catalyst portion and the heat storage device, and flows out.

  On the other hand, after the first catalyst part is warmed up, the relatively high temperature exhaust gas from the combustion device flows into the inner space and passes through the first catalyst part and the heat storage device, thereby chemically reacting with the liquid. The heat storage material stores a heat by causing a chemical reaction (endothermic reaction) in which the liquid is gasified and separated by the heat of the exhaust gas. At this time, the gas supplied from the heat storage device to the evaporation condensing device is condensed into a liquid and stored in the evaporation condensing device.

  In this way, when heat is dissipated by the heat storage device, the gas supplied to the heat storage device is sufficiently secured by heating the evaporation condensing device using the relatively low temperature exhaust gas from the combustion device and evaporating the liquid inside. can do. Therefore, heat generation at the heat storage device, that is, heat dissipation can be set to a sufficiently high temperature, and heat dissipation at a sufficiently high temperature can be maintained by the heat storage device.

  Further, since the inner cylinder, the outer cylinder, and the evaporative condensing device can be coaxially arranged in order from the inside to the outside on the outside of the first catalyst unit and the heat storage device, the catalyst warm-up device itself can be downsized. Therefore, in the catalyst warm-up device, the device itself can be reduced in size while maintaining sufficiently high heat dissipation in the heat storage device.

  In the invention which concerns on Claim 2 comprised as mentioned above, in Claim 1, the 1st catalyst part and the heat storage apparatus are arrange | positioned inside the evaporation condensation apparatus. According to this, since the axial length of the catalyst warm-up device can be further shortened, the device itself can be further downsized.

  In the invention according to claim 3 configured as described above, in claim 1 or claim 2, the outer space is provided with an inlet for introducing the exhaust gas and a folded flow path for leading the exhaust gas from the communication hole. The return channel is disposed inside the evaporative condenser. According to this, since it is possible to secure a longer exhaust gas flow path length, it is possible to maintain high heat exchange efficiency of the exhaust gas.

  In the invention according to Claim 4 configured as described above, in any one of Claims 1 to 3, the communication hole is provided in an upstream portion related to the exhaust gas of the inner cylinder. According to this, the exhaust gas after the heat exchange with the evaporative condenser can flow into the inner cylinder from the upstream side of the first catalyst portion through the communication hole, and the exhaust gas can be reliably purified. it can.

  In the invention according to claim 5 configured as described above, in any one of claims 1 to 4, the evaporative condensing device includes an outer cylinder disposed such that the axial direction is along the horizontal direction. A first water storage section that is coaxially disposed so as to surround and is provided in an upper part of the evaporative condensation apparatus and stores liquid, a second water storage section that is provided in an inner side of the evaporative condensation apparatus and stores liquid, and the evaporation And a third water storage section that is provided at the inner bottom of the condensing device and stores liquid. According to this, when the first catalyst part is warmed up, the gas supplied from the heat storage device to the evaporative condensing device is condensed into a liquid and stored in the evaporative condensing device. Water can be stored not only at the bottom of the interior but also at the interior top and interior sides. Therefore, when the heat is then radiated by the heat storage device, the liquid stored in the upper portion, the side portion, and the bottom can be efficiently and quickly evaporated, and the heat storage device can be radiated efficiently and quickly.

  In the invention according to claim 6 configured as described above, in claim 5, the evaporative condensing device is provided with an inner peripheral wall that contacts the outer cylinder, an inner peripheral wall, and an outer peripheral wall disposed with a space therebetween. The first water reservoir is composed of at least a groove formed between the inner peripheral wall and the outer peripheral wall, and the second water reservoir is interposed between the inner peripheral wall and the outer peripheral wall. The third water reservoir is formed by a groove formed by a rib interposed between the inner peripheral wall and the outer peripheral wall. According to this, when the heat of the exhaust gas transmitted from the outer cylinder to the inner peripheral wall is transmitted to the outer peripheral wall via the ribs and the bowl-shaped member and radiated by the heat storage device, the heat is exhausted to the upper part, the side part and the bottom part. The stored liquid can be evaporated more efficiently and quickly.

  In the invention concerning Claim 7 comprised as mentioned above, the catalyst warm-up apparatus as described in any one of Claim 1 thru | or 6 and the catalyst warm-up apparatus provided in parallel with the 1st exhaust pipe are equipped. A second exhaust pipe that bypasses and a second exhaust pipe that is provided in the first exhaust pipe downstream of the exhaust gas flow from the confluence of the first exhaust pipe and the second exhaust pipe and that is configured to purify the exhaust gas. And a catalyst part. According to this, when warming up the second catalyst unit, first, the relatively low temperature exhaust gas from the combustion device flows into the outer space without passing through the inner space of the catalyst warming device, and the evaporation condensing device is The liquid inside the evaporative condenser is heated and evaporated to be supplied to the heat storage device, and the heat storage material and the liquid chemically react to generate heat to dissipate heat. The heat causes the first catalyst portion that contacts the heat storage device to be heated. When the first catalyst part is heated and reaches the activation temperature range, the first catalyst part is further heated by the catalytic reaction. Therefore, the exhaust gas after heat exchange by the evaporative condenser flows into the inner space through the communication hole, is heated and flows out by the first catalyst unit and the heat storage device, and then reaches the second catalyst unit to be heated. To do. After that, when the temperature of the second catalyst part becomes the activation temperature range, the exhaust gas from the combustion device is circulated to the second catalyst part via the second exhaust pipe, and the second catalyst part is caused by the catalytic reaction. Heated. Therefore, compared with a system in which the second catalyst unit is larger than the first catalyst unit and the second catalyst unit is directly heated by the heat storage device, the heat storage device can be made smaller and the catalyst warm-up can be reduced. The machine itself and thus the catalyst warm-up system can be reduced in size.

It is a schematic diagram showing composition of a catalyst warm-up device and a catalyst warm-up system according to the present invention. It is an external appearance perspective view which shows the catalyst warm-up apparatus 20 shown in FIG. It is a disassembled perspective view which shows the structure of the catalyst warm-up apparatus 20 shown in FIG. It is a perspective view which shows the internal structure of the catalyst warming-up apparatus 20 shown in FIG. 2 (the outer cylinder 22 is also the introduction part 22b, the introduction part 21b of the inner cylinder 21, and the derivation | leading-out part 21c are abbreviate | omitted (cut | disconnected)). 5A is a front view showing the reactor 23 accommodated in the inner cylinder 21, and FIG. 5B is a cross-sectional view taken along the line 5b-5b showing the reactor 23 accommodated in the inner cylinder 21. FIG. It is. FIG. 6A is a sectional view showing the reactor 23, and FIG. 6B is a bottom view showing the reactor 23. 7A is a cross-sectional view of a plane orthogonal to the axial direction showing the evaporative condensing device 24, and FIG. 7B is a cross-sectional view taken along the line 7b-7b showing the evaporative condensing device 24. FIG. 3 is an exploded perspective view showing the configuration of the catalyst warm-up device 20 in order to explain the action when heat is radiated by the heat storage device. FIG. 3 is an exploded perspective view showing the configuration of the catalyst warm-up device 20 in order to explain the operation when heat is stored in the heat storage device.

  Hereinafter, an embodiment of a catalyst warm-up device and a catalyst warm-up system including the catalyst warm-up device according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of the catalyst warm-up system, FIG. 2 is an external perspective view showing the catalyst warm-up device 20, and FIG. 3 is an exploded perspective view showing the configuration of the catalyst warm-up device 20. 4 is a perspective view showing the internal configuration of the catalyst warm-up device 20, FIG. 5 (a) is a front view showing the reactor 23 housed in the inner cylinder 21, and FIG. 5 (b) is the inner cylinder. FIG. 6A is a sectional view showing the reactor 23, FIG. 6B is a bottom view showing the reactor 23, and FIG. FIG. 7A is a cross-sectional view of a surface orthogonal to the axial direction showing the evaporative condensing device 24, and FIG. 7B is a cross-sectional view taken along the line 7 b-7 b showing the evaporative condensing device 24.

  The catalyst warm-up system includes a main exhaust pipe 12 that is connected to an engine 11 (combustion device) of a vehicle and discharges (circulates) the exhaust gas, and a catalyst that is provided in the middle of the main exhaust pipe 12 and purifies the exhaust gas. A main catalyst section 13 (second catalyst section), a sub exhaust pipe 14 disposed between the engine 11 and the main catalyst section 13 and connected in parallel to the main exhaust pipe 12, and a sub exhaust pipe 14 A catalyst warming device 20 provided in the middle and a switching device 15 for switching the flow path of the exhaust gas from the engine 11 are provided.

  The engine 11 emits exhaust gas by burning fuel (for example, gasoline) with an oxidant gas (for example, air (containing oxygen)). The catalyst of the main catalyst unit 13 is, for example, a catalyst supported on a metal carrier, the catalyst amount is larger than that of the sub catalyst unit 35, and the catalyst capacity (amount for purifying exhaust gas) is also higher than that of the sub catalyst unit 35. is there. The sub exhaust pipe 14 branches from the main exhaust pipe 12 and then joins again. The catalyst of the main catalyst unit 13 may be a ceramic carrier instead of a metal carrier.

  The switching device 15 includes three on-off valves 15a, 15b, and 15c. The on-off valve 15 a is disposed between the branch point of the main exhaust pipe 12 and the sub exhaust pipe 14 and the junction. The on-off valve 15b is disposed in one of the two branched sub exhaust pipes 14 that communicates with the inlet 21b1 of the inner cylinder 21. The on-off valve 15c is disposed in one of the two branched sub exhaust pipes 14 that communicates with the inlet 22b1 of the outer cylinder 22. These on-off valves 15a, 15b, and 15c are opened and closed by a command from the control device.

  The catalyst warm-up device 20 warms up the sub-catalyst portion 35 having a catalyst for purifying exhaust gas, and warms up the main catalyst portion 13 disposed downstream of the exhaust gas flow. The catalyst warm-up device 20 includes an inner cylinder 21, an outer cylinder 22, a reactor 23, and an evaporation condensing device 24. Warm-up refers to heating until the temperature of the main catalyst portion 13 and the sub catalyst portion 35 reaches the catalyst activation temperature range.

  The inner cylinder 21 is provided in communication with the sub exhaust pipe 14. The inner cylinder 21 is formed in a cylindrical shape in which an axial center portion is expanded, and a main body 21a disposed coaxially and in series, an introduction part 21b for introducing exhaust gas, and a lead-out part for deriving exhaust gas. 21c. Inside the inner cylinder 21, an inner space R1 through which exhaust gas flows is formed. An introduction portion 21b is integrally connected to the main body 21a. The derivation | leading-out part 21c is attached to the main body 21a so that attachment or detachment is possible.

  An introduction port 21b1 for introducing exhaust gas is formed in one opening (opening of the introduction portion 21b) of the inner space R1, and a lead-out port 21c1 for leading exhaust gas is formed in the other opening (opening of the lead-out portion 21c). Has been. The inlet 21b1 is connected to the upstream side sub exhaust pipe 14, and the outlet 21c1 is connected to the downstream side sub exhaust pipe 14. The inlet 21b1 and the outlet 21c1 are formed with a smaller diameter than the main body 21a. A reactor 23 is accommodated in the main body 21a of the inner cylinder 21, that is, in the inner space R1. Therefore, the exhaust gas that has flowed into the inner space R1 from the upstream side sub exhaust pipe 14 through the inlet 21b1 passes through the reactor 23 disposed in the inner space R1, passes through the outlet 21c1, and passes through the inner space R1. To the sub-exhaust pipe 14 on the downstream side.

  In addition, the lead-out portion 21c of the inner cylinder 21 is provided with an end wall 21d that is a flange formed in an annular shape. The end wall 21 d comes into contact with the other end opening of the main body 21 a of the inner cylinder 21 and the other end opening of the main body 22 a of the outer cylinder 22. A pipe 21e is attached to the end wall 21d. The base side of the pipe 21e is fixed to the end wall 21d. A fixing flange 21e1 is provided on the free side of the pipe 21e.

  As shown in FIGS. 4 and 5, the reactor 23 includes a heat storage device 30 and a sub catalyst unit 35.

The heat storage device 30 is filled with a heat storage material 30a that generates heat by chemically reacting with a liquid. For example, examples of the heat storage material include calcium oxide CaO and magnesium oxide MgO. Examples of the liquid that chemically reacts with the heat storage material include water and alcohol. Calcium oxide CaO reacts with water H ₂ O to produce calcium hydroxide Ca (OH) ₂ with heat generation. At this time, heat is radiated by the heat storage device 30. Conversely, when calcium hydroxide Ca (OH) ₂ is heated (endothermic reaction), calcium oxide CaO and water H ₂ O are generated. At this time, heat is stored in the heat storage device 30.

  As shown in FIGS. 5 and 6, the heat storage device 30 includes a plurality of heat exchanging units 31 and a connecting unit 32 that communicates adjacent heat exchanging units 31. The heat exchange part 31 is formed in a hollow and flat plate shape with a material having high thermal conductivity. The heat exchange units 31 are arranged in parallel so as to face each other with a space. In this embodiment, each heat exchange part 31 is arranged in parallel. The heat exchanger 31 is filled with a heat storage material 30a. The connecting portion 32 is also formed hollow and is filled with a heat storage material 30a. The connection part 32 is provided in the peripheral part (this embodiment center of a lower end part) of the heat exchange part 31. By disposing the connecting portion 32 on the peripheral portion of the heat exchanging portion 31, the remaining portion can be used as a contact surface with the catalyst layer 35a, and the assemblability of the reactor 23 can be improved. It is.

  A catalyst layer 35a is interposed between two adjacent heat exchange portions 31. The catalyst layer 35a is obtained by supporting a catalyst on a metal carrier. This catalyst is a catalyst for purifying exhaust gas. The catalyst layer 35a is porous and configured to allow gas to pass therethrough. In the present embodiment, a catalyst layer 35a is interposed between two adjacent heat exchanging portions 31 in contact with the heat exchanging portion 31, and a sub catalyst portion 35 is configured from the catalyst layers 35a. .

  As shown in FIGS. 3, 5, and 6, the heat storage device 30 is provided with a mounting portion 33 formed in a hollow shape. The attachment part 33 is formed of a connection part 33a formed in a cylindrical shape and having one end connected to the heat exchange part 31, and an annular flange 33b connected to the other end of the connection part 33a. The connecting portion 33a is held in a guide hole 21a1 formed in the main body 21a of the inner cylinder 21. The guide hole 21a1 is for guiding the reactor 23 when it is accommodated in the main body 21a of the inner cylinder 21. The flange 33b is fixed to the flange 21e1 of the pipe 21e provided on the inner cylinder 21 side by welding or screwing.

  In addition, the reactor 23 may be disposed so as to be shifted to the outside in the axial direction instead of the inside of the evaporation condensing device 24 (described later).

  The outer cylinder 22 is formed in a cylindrical shape having a large-diameter portion and a small-diameter portion, and covers the main body 21a and the introduction portion 21b of the inner cylinder 21 with a space and is arranged coaxially (in parallel). The outer cylinder 22 includes a main body 22a that is coaxially arranged in series and an introduction portion 22b that introduces exhaust gas. The main body 22a corresponds to the main body 21a of the inner cylinder 21, and the introduction part 22b is arranged corresponding to the introduction part 21b of the inner cylinder.

  An outer space R2 through which exhaust gas flows is formed between the inner cylinder 21 and the outer cylinder 22 along the axial direction. An introduction port 22b1 for introducing exhaust gas is formed in one (one end) opening (opening of the introduction portion 22b) of the outer space R2, and the introduction port 22b1 is connected to the sub exhaust pipe 14 on the upstream side. The other (other end) of the outer space R2 is closed by an end wall 21d. The inner cylinder 21 is formed with a communication hole 21a2 that communicates the inner space R1 and the outer space R2. Therefore, the exhaust gas flowing into the outer space R2 from the upstream sub exhaust pipe 14 through the inlet 22b1 flows through the outer space R2, and then flows from the outer space R2 into the inner space R1 through the communication hole 21a2. , It passes through the reactor 23 disposed in the inner space R1, flows out to the downstream side sub exhaust pipe 14 through the outlet 21c1.

  The communication hole 21a2 is provided in the upstream portion of the inner cylinder 21 related to the exhaust gas. The upstream part includes the upstream part of the main body 21a and the introduction part 21b. What is necessary is just to make it the position of the communicating hole 21a2 become upstream from the reactor 23.

  The outer space R2 includes a folded channel 41 as mainly shown in FIG. In the present embodiment, a plurality of (for example, four) folded flow passages 41 divided and divided along the circumferential direction are provided. The folded channel 41 extends in the axial direction in order to partition from the adjacent folded channel 41, and the other first partition plate 42 is in contact with (connected to) the end wall 21d at the other end. And a second partition plate 43 extending in the axial direction between the two first partition plates in order to form a folded portion and having the other end disposed with a space between the end wall 21d, and It has. The first and second partition plates 42 and 43 are provided on the main body 21 a of the inner cylinder 21.

An opening formed between one of the two adjacent first partition plates 42 and the second partition plate 43 serves as an inlet 41 a of the folded channel 41. The opening formed between the other first partition plate 42 and the second partition plate 43 is closed by a closing plate 44. A communication hole 21 a 2 is formed at the closed end of the folded flow path 41. Therefore, the exhaust gas flowing in from the introduction port 41a flows back along the return flow path 41 and then flows out to the inner space R1 through the communication hole 21a2.
The folded channel 41 configured in this way is disposed so as to be located inside the evaporative condenser 24.

  The evaporative condensing device 24 is provided in contact with the outer cylinder 22, is airtightly communicated with the heat storage device 30, and evaporates by heating a liquid (for example, water) stored therein and supplies it to the heat storage device 30. On the other hand, the gas (for example, water vapor) supplied from the heated heat storage device 30 is condensed to generate a liquid (for example, water) and stored therein.

  Specifically, as shown in FIG. 7, the evaporative condensing device 24 includes an inner peripheral wall 51 formed in a cylindrical shape, and an outer periphery formed coaxially with a space outside the inner peripheral wall 51. A wall 52, a closing member 53 formed in an annular shape for closing an annular opening between one end of the inner peripheral wall 51 and one end of the outer peripheral wall 52, and an annular opening between the other end of the inner peripheral wall 51 and the other end of the outer peripheral wall 52 A closing member 54 formed in an annular shape is provided. Here, in the present embodiment, the inner peripheral wall 51 coincides with the main body 22 a of the outer cylinder 22, but may be configured by a member different from the outer cylinder 22. In this case, the separate member is preferably in contact with the outer cylinder 22. The term “annular” includes not only a circular shape but also a substantially quadrangular shape.

  The evaporative condensing device 24 is coaxially disposed (arranged) so as to surround the main body 22a of the outer cylinder 22 disposed so that the axial direction is along the horizontal direction. An annular space R3 is formed in the evaporative condenser 24. A first water reservoir 55 that stores a liquid (for example, water) used in the above-described chemical reaction is provided in the upper portion of the annular space R3. Further, a second water reservoir 56 for storing liquid is provided at the side of the annular space R3, and a third water reservoir 57 for storing liquid is provided at the bottom.

  The first water reservoir 55 includes a groove 55 b formed at least by a rib 55 a interposed between the inner peripheral wall 51 and the outer peripheral wall 52. That is, the rib 55a is a plate-like member extending in the axial direction. The lower end of the rib 55 a is connected (connected) to the inner peripheral wall 51, and the upper end is connected (connected) to the outer peripheral wall 52. A plurality of ribs 55a are provided. On both sides of the rib 55a, partitions 55c whose lower ends are connected (connected) to the inner peripheral wall 51 are arranged in parallel. The partition 55c is a plate-like member having a height lower than that of the rib 55a and extending in the axial direction. Both ends in the extending direction of each rib 55a and each partition 55c are closed by partitions 55d and 55e. The groove 55b is defined by a rib 55a, a partition 55c, and partitions 55d and 55e. Note that a plurality of notches 55a1 are formed in the upper half of the rib 55a at intervals. The rib 55a secures the gas flowability by the notch 55a1 and the strength of the evaporative condensing device 24.

  The 2nd water storage part 56 is comprised by the bowl-shaped member 56a which was interposed between the inner peripheral wall 51 and the outer peripheral wall 52, and was open | released upwards. That is, the flange-shaped member 56a is a member that extends in the axial direction and has a V-shaped cross section. The cross-sectional shape may be U-shaped, and a shape that expands upward is preferable. This is because it is easy to catch the liquid falling from above, and the flowability of the gas flowing in the axial direction in the annular space R3 can be secured. In addition, one of the open ends of the bowl-shaped member 56 a is connected (connected) to the inner peripheral wall 51, and the other is connected (connected) to the outer peripheral wall 52. A plurality of hook-shaped members 56a are arranged side by side with a space therebetween. Both ends in the extending direction of the bowl-shaped member 56a are closed by lids 56b and 56c.

  The third water reservoir 57 is configured by a groove 57 b formed by a rib 57 a interposed between the inner peripheral wall 51 and the outer peripheral wall 52. That is, the rib 57a is a plate-like member extending in the axial direction. The lower end of the rib 57 a is connected (connected) to the outer peripheral wall 52, and the upper end is connected (connected) to the inner peripheral wall 51. A plurality of ribs 57a are provided. Note that a plurality of notches 57a1 are formed in the lower half of the rib 57a at intervals. The ribs 57a ensure gas and / or liquid flowability by the notches 57a1 and also ensure the strength of the evaporative condenser 24.

  The evaporative condensing device 24 is in airtight communication with the heat storage device 30 via the connection pipe 58. The evaporative condensing device 24 evaporates the liquid (for example, water) stored in the first to third water storage units 55 to 57 to evaporate it to increase the saturated water vapor pressure, thereby allowing the water vapor to pass through the connection pipe 58. Supplied to the heat storage device 30. On the other hand, the evaporative condensing device 24 condenses gas (for example, water vapor) supplied via the connecting pipe 58 from the heat storage device 30 that has been heated to a higher temperature than the evaporative condensing device 24 to generate a liquid (for example, water). It stores in the 1st-3rd water storage part 55-57.

  Next, the operation of the catalyst warm-up device 20 and the catalyst warm-up system configured as described above will be described with reference to FIGS.

  First, heat dissipation will be described with reference to FIG. When the heat storage device 30 radiates heat, the on-off valve 15a and the on-off valve 15b are closed, and the on-off valve 15c is opened. As a result, the exhaust gas flows into the outer space R2 (folded flow path 41) without passing through the inner space R1, heats the evaporative condenser 24, and then flows into the inner space R1 through the communication hole 21a2. 35 and the heat storage device 30 (flow along the arrows shown in FIG. 8).

  At this time, the relatively low temperature exhaust gas from the engine 11 at the beginning of the start of the engine 11 flows into the outer space R2 without passing through the inner space R1, so that the evaporative condensing device 24 is heated. As a result, the liquid inside the evaporation condensing device 24 (the liquid stored in the first to third water storage portions 55 to 57) is evaporated by being heated and supplied to the heat storage device 30. The heat storage material 30 a and the vaporized liquid chemically react to generate heat and radiate heat in the heat storage device 30. The heat heats the catalyst layer 35 a of the sub-catalyst portion 35 that contacts the heat storage device 30.

  On the other hand, the exhaust gas after heat exchange with the evaporative condenser 24 flows into the inner space R1 through the communication hole 21a2, is heated by the heat storage device 30, and flows out. At this time, when the catalyst layer 35a reaches the activation temperature range due to heating by the heat storage device 30, the catalytic reaction with the exhaust gas occurs. Then, the exhaust gas is heated by the catalytic reaction with the exhaust gas in addition to the heat generated by the heat storage device 30, and higher temperature exhaust gas is supplied to the main catalyst unit 13.

  Thus, the catalyst of the main catalyst unit 13 is heated and warmed up by the high-temperature exhaust gas supplied from the catalyst warm-up device 20. As a result, the temperature of the catalyst reaches the catalyst temperature range. Further, when the catalyst of the main catalyst portion 13 reaches the activation temperature range, the catalyst reacts with the exhaust gas and generates heat, and the main catalyst portion 13 is heated with its own heat generation.

  Thereafter, when the temperature of the main catalyst portion 13 is in the activation temperature range, the on-off valve 15b and the on-off valve 15c are closed and the on-off valve 15a is opened. Thereby, the exhaust gas from the engine 11 is circulated through the main catalyst part 13 that has reached the activation temperature range via the main exhaust pipe 12, and the second catalyst part is heated by the catalytic reaction.

  Next, heat storage will be described with reference to FIG. This heat storage is performed when the engine 11 is in operation at the time when the warm-up of the sub catalyst unit 35 and the main catalyst unit 13 is completed after the engine 11 is started. When the heat storage device 30 stores heat, the on-off valve 15c is closed and the on-off valve 15a and the on-off valve 15b are opened. Thereby, the exhaust gas having a relatively high temperature from the engine 11 flows into the inner space R1 and flows out through the sub catalyst part 35 and the heat storage device 30 (circulates along the arrows shown in FIG. 9).

  Thus, when the exhaust gas passes through the heat storage device 30, the heat storage material 30 a chemically reacted with the liquid causes a chemical reaction (endothermic reaction) in which the liquid is gasified and separated by the heat of the exhaust gas to store heat. At this time, the gas supplied from the heat storage device 30 to the evaporation condensing device 24 is condensed to become a liquid and stored in the evaporation condensing device 24 (first to third water storage portions 55 to 57).

  The “first exhaust pipe” recited in the claims includes a main exhaust pipe 12 from the engine 11 to the branch point, a sub exhaust pipe 14, and a main exhaust pipe 12 after the junction. The “second exhaust pipe” described in the claims refers to the main exhaust pipe 12 from the branching point to the merging point, and is provided in parallel with the first exhaust pipe to bypass the catalyst warm-up device 20. To do.

  As is clear from the above description, in the catalyst warm-up device and the catalyst warm-up system according to the present embodiment, the inner cylinder 21 is provided in communication with the sub-catalyst portion 35 and the heat storage in the middle of the first exhaust pipe. An apparatus 30 (filled with a heat storage material that is provided in contact with the first catalyst portion and generates heat by chemically reacting with the liquid) is housed inside. The outer cylinder 22 covers the inner cylinder 21 and is disposed coaxially, and is formed along the axial direction between the inner cylinder 21 and has one end connected to the first exhaust pipe and the other end closed. R2 is provided. The inner space R1 and the outer space R2 formed in the inner cylinder 21 communicate with each other through a communication hole 21a2. The evaporative condensing device 24 is provided in contact with the outer cylinder 22 and is hermetically communicated with the heat storage device 30, evaporates by heating the liquid inside, is supplied to the heat storage device 30, and is heated while being heated. The gas supplied from is condensed to generate a liquid and stored inside. When the heat storage device 30 dissipates heat, the exhaust gas flows into the outer space R2 without passing through the inner space R1, heats the evaporation condensing device 24, and then flows into the inner space R1 through the communication hole 21a2. 35 and the heat storage device 30, while the heat storage device 30 stores heat, the exhaust gas flows into the inner space R <b> 1 and flows out through the sub-catalyst unit 35 and the heat storage device 30.

  Therefore, when warming up the sub-catalyst portion 35, the relatively low temperature exhaust gas from the combustion device flows into the outer space R2 without passing through the inner space R1, and the evaporation condensing device 24 is heated. The liquid is heated to evaporate and supplied to the heat storage device 30, and the heat storage material 30a and the liquid react chemically to generate heat and dissipate heat. The sub-catalyst portion 35 that contacts the heat storage device 30 is heated by the heat. The exhaust gas after heat exchange in the evaporative condenser 24 flows into the inner space R1 through the communication hole 21a2, is heated by the sub catalyst part 35 and the heat storage device 30, and flows out.

  On the other hand, after the sub-catalyst portion 35 is warmed up, the relatively high-temperature exhaust gas from the engine 11 flows into the inner space R1 and passes through the sub-catalyst portion 35 and the heat storage device 30, whereby the heat storage chemically reacted with the liquid. The material 30a accumulates heat by causing a chemical reaction (endothermic reaction) in which the liquid is gasified and separated by the heat of the exhaust gas. At this time, the gas supplied from the heat storage device 30 to the evaporation condensing device 24 is condensed into a liquid and stored in the evaporation condensing device 24.

  As described above, when the heat storage device 30 dissipates heat, the gas supplied to the heat storage device 30 by heating the evaporation condensing device 24 using the relatively low temperature exhaust gas from the engine 11 and evaporating the liquid inside. Can be secured sufficiently. Therefore, heat generation at the heat storage device 30, that is, heat dissipation, can be set to a sufficiently high temperature, and the heat storage device 30 can maintain heat dissipation at a sufficiently high temperature.

  Further, since the inner cylinder 21, the outer cylinder 22, and the evaporative condensing device 24 can be coaxially arranged (in parallel) on the outer side of the sub catalyst unit 35 and the heat storage device 30 in order from the inner side to the outer side, the catalyst warm-up device 20 itself. Can be miniaturized. Therefore, in the catalyst warm-up device 20, the device itself can be reduced in size while maintaining sufficiently high heat dissipation in the heat storage device 30.

  Further, the sub catalyst unit 35 and the heat storage device 30 are disposed inside the evaporation condensing device 24. According to this, since the axial length of the catalyst warm-up device 20 can be further shortened, the device itself can be further downsized.

  In addition, the outer space R2 is provided with an inlet 41a for introducing exhaust gas, and is provided with a return channel 41 through which the exhaust gas is led out from the communication hole 21a2, and the return channel 41 is disposed inside the evaporation condensing device 24. Has been. According to this, since it is possible to secure a longer exhaust gas flow path length, it is possible to maintain high heat exchange efficiency of the exhaust gas.

  Further, the communication hole 21 a 2 is provided in an upstream portion related to the exhaust gas of the inner cylinder 21. According to this, the exhaust gas after heat exchange in the evaporative condenser 24 can flow into the inner cylinder 21 from the upstream side of the first catalyst part through the communication hole 21a2, and the exhaust gas is reliably purified. can do.

  Further, the evaporative condensing device 24 is coaxially disposed so as to surround the outer cylinder 22 disposed so that the axial direction thereof is along the horizontal direction, and is provided at the upper part inside the evaporative condensing device 24 to store the liquid. A water storage unit 55; a second water storage unit 56 provided on the inner side of the evaporative condensing device 24 for storing liquid; and a third water storage unit 57 provided on the inner bottom of the evaporative condensing device 24 for storing liquid. ing. According to this, after the sub-catalyst portion 35 is warmed up, the gas supplied from the heat storage device 30 to the evaporative condensing device 24 is condensed and becomes liquid, and the liquid evaporates when stored in the evaporative condensing device 24. Water can be stored not only at the bottom inside the condensing device 24 but also at the internal upper part and the internal side (can be dispersed and stored in the evaporation condensing device). Therefore, when the heat is then radiated by the heat storage device 30, the liquid stored in the upper, side and bottom portions can be efficiently and quickly evaporated, and the heat storage device 30 can be radiated efficiently and early. .

  The evaporative condensing device 24 includes an inner peripheral wall 51 that contacts the outer cylinder 22, an inner peripheral wall 51, and an outer peripheral wall 52 that is disposed with a space therebetween, and the first water reservoir 55 includes the inner peripheral wall 51 and the outer peripheral wall 51. The second water reservoir 56 is interposed between the inner peripheral wall 51 and the outer peripheral wall 52 and is opened upward. The groove 55b is formed by at least a rib 55a interposed between the inner wall 51 and the wall 52. The third water storage part 57 is constituted by a groove 57b formed by a rib 57a interposed between the inner peripheral wall 51 and the outer peripheral wall 52. According to this, when the heat of the exhaust gas transmitted from the outer cylinder 22 to the inner peripheral wall 51 is transmitted to the outer peripheral wall 52 via the ribs 55 a and 57 a and the flange-shaped member 56 a and is radiated by the heat storage device 30. In addition, the liquid stored in the top, side and bottom can be evaporated more efficiently and quickly.

  The catalyst warm-up system includes a catalyst warm-up device 20, a second exhaust pipe that is provided in parallel with the first exhaust pipe and bypasses the catalyst warm-up device 20, and the first exhaust pipe and the second exhaust pipe. And a main catalyst portion 13 made of a catalyst for purifying exhaust gas, which is provided in a first exhaust pipe downstream of the exhaust gas flow from the confluence point. According to this, when warming up the main catalyst unit 13, first, a relatively low temperature exhaust gas from the engine 11 flows into the outer space R <b> 2 without passing through the inner space R <b> 1 of the catalyst warming device 20 and is evaporated and condensed. The apparatus 24 is heated and the liquid inside the evaporative condensing apparatus 24 is heated to evaporate it, and is supplied to the heat storage device 30. The heat storage material 30a and the liquid chemically react to generate heat and dissipate heat. The sub-catalyst portion 35 that contacts the heat storage device 30 is heated by the heat. When the sub catalyst part 35 is heated and reaches the activation temperature range, the sub catalyst part 35 is further heated by the catalytic reaction. Therefore, the exhaust gas after the heat exchange in the evaporative condenser 24 flows into the inner space R1 through the communication hole 21a2, is heated by the sub-catalyst portion 35 and the heat storage device 30, and then reaches the main catalyst portion 13. And heat. Thereafter, when the temperature of the main catalyst portion 13 becomes the activation temperature range, the exhaust gas from the engine 11 is circulated to the main catalyst portion 13 through the second exhaust pipe, and the main catalyst portion 13 is heated by the catalytic reaction. . Therefore, as compared with a system in which the main catalyst unit 13 is larger than the sub catalyst unit 35 and the main catalyst unit 13 is directly heated by the heat storage device 30, the heat storage device 30 can be made smaller, and the catalyst warm-up is performed. The apparatus 20 itself and thus the catalyst warm-up system can be reduced in size.

  In the above-described embodiment, the reactor 30 may be disposed so as to be shifted to the outside in the axial direction instead of the inside of the evaporative condenser 24.

DESCRIPTION OF SYMBOLS 11 ... Engine, 12 ... Main exhaust pipe, 13 ... Main catalyst part (2nd catalyst part), 14 ... Sub exhaust pipe, 15 ... Switching apparatus 15, 20 ... Catalyst warm-up apparatus, 21 ... Inner cylinder, 21a2 ... Communication Hole, 22 ... outer cylinder, 23 ... reactor, 24 ... evaporative condensing device, 30 ... heat storage device, 30a ... heat storage material, 35 ... sub-catalyst part (first catalyst part), 41 ... folding channel, 55 ... first 1 water storage part, 55a ... rib, 55b ... groove, 56 ... 2nd water storage part, 56a ... bowl-shaped member, 56b ... groove, 57 ... 3rd water storage part, 57a ... rib, inner space ... R1, outer space ... R2, R3: An annular space.

Claims (7)

A first catalyst part that is provided in the middle of a first exhaust pipe through which exhaust gas discharged from the combustion device circulates, and a liquid that is provided in contact with the first catalyst part and a catalyst that purifies the exhaust gas. In a catalyst warm-up device comprising a heat storage device filled with a heat storage material that chemically generates and generates heat,
An inner cylinder provided in communication with the first exhaust pipe and in which the first catalyst part and the heat storage device are housed;
An outer space is provided coaxially so as to cover the inner cylinder and formed along the axial direction between the inner cylinder and one end connected to the first exhaust pipe and the other end closed. An outer cylinder,
A communication hole communicating the inner space and the outer space formed in the inner cylinder;
Gas that is provided in contact with the outer cylinder and hermetically communicates with the heat storage device, and is evaporated by heating the liquid inside and supplied to the heat storage device, while being supplied from the heated heat storage device An evaporative condensing device for condensing the liquid to produce the liquid and storing it inside,
When the heat storage device radiates heat, the exhaust gas flows into the outer space without passing through the inner space to heat the evaporative condensing device, and then flows into the inner space through the communication hole. Flowing out through the catalyst part and the heat storage device,
On the other hand, the catalyst warm-up device is configured to allow the exhaust gas to flow into the inner space and flow out through the first catalyst unit and the heat storage device when the heat storage device stores heat.   The catalyst warm-up device according to claim 1, wherein the first catalyst unit and the heat storage device are disposed inside the evaporative condensation device.   3. The outer space according to claim 1, wherein the outer space is provided with a return flow path for introducing the exhaust gas and leading the exhaust gas from the communication hole. A catalyst warm-up device, which is disposed inside a condensing device.   4. The catalyst warm-up device according to claim 1, wherein the communication hole is provided in an upstream portion of the inner cylinder related to the exhaust gas. 5.   5. The evaporative condensing apparatus according to claim 1, wherein the evaporative condensing apparatus is coaxially disposed so as to surround the outer cylinder disposed so that an axial direction thereof is along a horizontal direction. A first water storage section that is provided in an upper portion of the evaporative condenser, a second water storage section that is provided in an inner side portion of the evaporative condensing apparatus, and that is provided in an inner bottom portion of the evaporative condensing apparatus. A catalyst warm-up device comprising a third water storage section for storing. In Claim 5, the evaporative condensing device includes an inner peripheral wall that contacts the outer cylinder, and an outer peripheral wall disposed with a space between the inner peripheral wall and the inner peripheral wall,
The first water reservoir is composed of a groove formed by at least a rib interposed between the inner peripheral wall and the outer peripheral wall,
The second water reservoir is configured by a bowl-shaped member that is interposed between the inner peripheral wall and the outer peripheral wall and is opened upward.
The catalyst warm-up device, wherein the third water reservoir is configured by a groove formed by a rib interposed between the inner peripheral wall and the outer peripheral wall. The catalyst warm-up device according to any one of claims 1 to 6,
A second exhaust pipe that is juxtaposed to the first exhaust pipe and bypasses the catalyst warm-up device;
A second catalyst part, which is provided in the first exhaust pipe downstream of the exhaust gas flow from the confluence of the first exhaust pipe and the second exhaust pipe and is made of a catalyst for purifying the exhaust gas; A catalyst warm-up system characterized by comprising:

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