WO2011111778A1

WO2011111778A1 - Catalyst-containing engine exhaust gas heat exchanger and energy supply device using same

Info

Publication number: WO2011111778A1
Application number: PCT/JP2011/055640
Authority: WO
Inventors: 洋志東; 航典松浦
Original assignee: ヤンマー株式会社
Priority date: 2010-03-12
Filing date: 2011-03-10
Publication date: 2011-09-15
Also published as: JP2011190707A

Abstract

The disclosed catalyst-containing engine exhaust gas heat exchanger, which exchanges heat between an engine exhaust gas and cooling water, contains an internal exhaust gas purification catalyst. The configuration of said catalyst-containing engine exhaust gas heat exchanger makes it possible to prevent heat losses at an exhaust gas inflow section. Also, when bringing the exhaust gas in in the radial direction of the catalyst, the disclosed configuration makes it possible to prevent the exhaust gas from going off course at the catalyst inflow surface. In the disclosed catalyst-containing engine exhaust gas heat exchanger (1), which contains an internal exhaust gas purification catalyst (4) and serves as a heat exchanger (3) exchanging heat between an engine exhaust gas and cooling water, part of all of a dividing wall for a front chamber (2) is a multilayer plate. A gap (S) is provided between a tube material (21) and an inner tube (31) that constitute the multilayer plate. The front chamber (2) is provided with a flow rectification member (23), and excepting the part thereof that faces an exhaust gas inflow tube (35), said flow rectification member is provided with a plurality of exhaust gas inflow ports (23a) in the circumferential direction. Also disclosed is an energy supply device using the above catalyst-containing engine exhaust gas heat exchanger (1) in the exhaust gas passage of an engine.

Description

Engine exhaust gas heat exchanger with built-in catalyst and energy supply device using the same

The present invention relates to a catalyst built-in engine exhaust gas heat exchanger used in an engine-driven air conditioner, a cogeneration system, or the like.

Conventionally, in a catalyst built-in engine exhaust gas heat exchanger in which an exhaust gas purification catalyst is built in a heat exchanger between engine exhaust gas and cooling water, a front chamber before the exhaust gas flows into the catalyst is provided. In addition, a configuration surrounded by a partition wall forming a cooling water passage is disclosed (see FIGS. 3 to 5 of Patent Document 1).

Japanese Patent No. 4324219

However, in the case of the conventional engine exhaust gas heat exchanger described above, the exhaust gas flowing into the front chamber is surrounded by the partition walls forming the cooling water passage, and therefore passes through this cooling water passage before flowing into the catalyst. Heat is absorbed by the cooling water. Therefore, the exhaust gas has a temperature that flows into the catalyst, and the reaction with the catalyst may become inactive.

In addition, when exhaust gas flows in from the radial direction of the catalyst, the exhaust gas drifts in the front chamber and flows in a large amount from the inflow surface of the catalyst far from the inflow port, and the reaction of the catalyst may become inactive. there were.

The present invention has been made in view of the above circumstances, and in an engine exhaust gas heat exchanger with a built-in catalyst between an exhaust gas of an engine having a built-in exhaust gas purification catalyst and cooling water, an inflow portion of the exhaust gas The structure which can prevent the temperature fall in is provided. In addition, an object of the present invention is to provide a configuration capable of preventing exhaust gas drift on the catalyst inflow surface when exhaust gas is allowed to flow from the radial direction of the catalyst.

An engine exhaust gas heat exchanger with a built-in catalyst according to the present invention for solving the above-mentioned problem is a heat exchanger between an exhaust gas and cooling water of an engine, and has a catalyst built-in engine with a built-in exhaust gas purification catalyst. In the exhaust gas heat exchanger, all or part of the partition wall of the catalyst inflow portion is constituted by a multilayer plate. Further, in the engine built-in engine exhaust gas heat exchanger, the inner plate and the outer plate of the multilayer plate are separated from each other. Furthermore, in the heat exchanger between the engine exhaust gas and the cooling water, the exhaust gas flowing in from the radial direction of the built-in exhaust gas purification catalyst, the catalyst exhaust side heat exchanger The peripheral wall carrying the catalyst is extended, or a separate peripheral wall is provided, and a plurality of exhaust gas inlets are provided in the circumferential direction of the peripheral wall except for the facing portion with the exhaust gas inlet.

Moreover, the energy supply device of the present invention for solving the above-mentioned problems uses the above-described catalyst-integrated engine exhaust gas heat exchanger as an engine exhaust gas path in an energy supply device such as an engine-driven heat pump and cogeneration. Is.

As described above, according to the present invention, since the amount of heat absorbed by the cooling water before the exhaust gas flows into the catalyst can be suppressed, the temperature of the exhaust gas is prevented from decreasing and the reaction at the catalyst is activated. it can.

(A) is sectional drawing of the engine exhaust gas heat exchanger with a built-in catalyst based on this invention, (b) is II sectional view taken on the line of FIG. FIG. 2 is a circuit diagram of a cooling water circuit of an engine provided with a catalyst built-in engine exhaust gas heat exchanger shown in FIG. 1. (A) is the II-II sectional view taken on the line of Drawing 1 (a), and (b) is the partial expanded sectional view of an anterior chamber. (A) is sectional drawing which shows other embodiment of the front chamber of the engine exhaust gas heat exchanger with a built-in catalyst based on this invention, (b) is the III-III sectional view taken on the line of FIG.

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an engine exhaust gas heat exchanger 1 with a built-in catalyst according to the present invention, FIG. 2 shows an example of a cooling water circuit diagram of a gas engine 11 provided with the engine exhaust gas heat exchanger 1 with a built-in catalyst, FIG. 3 shows the configuration of the front chamber 2 of the engine exhaust gas heat exchanger 1 with the built-in catalyst.

That is, in the engine exhaust gas heat exchanger 1 with a built-in catalyst, the front chamber 2 before the exhaust gas in the heat exchanger 3 flows into the exhaust gas purification catalyst (hereinafter simply referred to as catalyst) 4 is the heat exchanger. The gap S is provided between the three inner cylinder pipes 31.

As shown in FIGS. 1 and 2, the catalyst built-in type engine exhaust gas heat exchanger 1 is configured such that the exhaust from the engine 11 to the silencer 12 flows into the front chamber 2, the catalyst 4, The cooling water of the engine 11 is provided so as to pass through the unit

exhaust gas passages

5a, 5b, 5c, and is introduced into the engine 11 after passing through the heat exchanger 3 of the catalyst exhaust type engine exhaust gas heat exchanger 1. It is provided to do. The cooling water after passing through the engine 11 is configured to circulate by a pump 13. Further, the temperature of the cooling water can be controlled by the thermostat 14, and the flow can be switched to the radiator 16 or the heat exchanger 17 by the three-way valve 15.

The heat exchanger 3 includes an inner cylinder pipe 31, an outer cylinder pipe 32,

inner lids

31a and 31b and

outer lids

32a and 32b provided at both ends thereof, and the gap is formed between cooling water through which cooling water passes. A passage 30 is formed.

In the heat exchanger 3, a cooling water inflow pipe 33 communicating with the cooling water passage 30 is provided at the outer lid 32 b at the other end, and the outer cylinder pipe 32 at one end communicates with the cooling water passage 30. A cooling water outflow pipe 34 is provided. As a result, the cooling water is introduced from the cooling water inflow pipe 33 into the cooling water passage 30, flows from the other end side to the one end side of the heat exchanger 3, and then drained from the cooling water outflow pipe 34. It is made like that.

Further, the heat exchanger 3 is provided with an exhaust gas inflow pipe 35 that passes through the inner cylindrical pipe 31 and the outer cylindrical pipe 32 at one end and communicates with the inner cylindrical pipe 31, and the inner cylindrical pipe at the other end. An exhaust gas outflow pipe 36 that penetrates the outer cylinder pipe 31 and the outer cylinder pipe 32 and communicates with the inner cylinder pipe 31 is provided. As a result, the exhaust gas is introduced from the exhaust gas inflow pipe 35 into the inner cylinder pipe 31, and the front chamber 2, the catalyst 4 and the three-stage unit

exhaust gas passages

5a and 5b formed in the inner cylinder pipe 31. After passing through 5c, the exhaust gas outlet pipe 36 is configured to exhaust the gas.

The front chamber 2 includes a tubular member 21 formed in the inner tube 31 so as to be gradually reduced in diameter while forming a curved surface with a slightly smaller diameter than the inner tube 31. 31 is provided so as to form an air gap S. One end on the reduced diameter side of the tube material 21 is fixed to an inner lid 31 a provided at one end of the heat exchanger 3. The exhaust gas inflow pipe 35 communicates with the inside of the pipe material 21. The other end of the pipe member 21 is provided with a cylindrical connection member 22 for receiving and connecting the catalyst 4 and the exhaust gas ejection pipe 51. The connecting member 22 is further reduced in diameter from the cylindrical main body 22a portion in contact with the inner peripheral surface of the inner cylindrical pipe 31 to form an exhaust gas ejection pipe connecting portion 22b and a catalyst connecting portion 22c. Yes. The portion of the main body 22a having the maximum diameter is interposed between the inner cylinder pipe 31 and the pipe material 21, and is fixed so as to maintain a gap S between the inner cylinder pipe 31 and the pipe material 21. The exhaust gas ejection pipe connecting portion 22b is configured to receive and connect the exhaust gas ejection pipe 51 to the outside thereof so as to form a gap d between the inner cylinder pipe 31 and the exhaust gas ejection pipe 51. The catalyst connecting portion 22c is configured to receive and connect the catalyst 4 inside thereof.

The unit exhaust gas passage 5 a is configured by an exhaust gas ejection pipe 51 connected to the exhaust gas ejection pipe connection portion 22 b of the connection member 22 and a connection member 52 provided on the downstream side of the exhaust gas ejection pipe 51. Yes.

The exhaust gas ejection pipe 51 is formed in a cylindrical shape having a diameter and a length capable of forming the gap d between the inner cylinder pipe 31 and the interior of the catalyst 4. A plurality of nozzle holes 50 are provided in the circumferential wall of the exhaust gas ejection pipe 51 at equal intervals along the longitudinal direction and the circumferential direction. Further, the exhaust gas ejection pipe 51 is closed at the downstream end by a lid 51a. The exhaust gas ejection pipe 51 is fixed in the inner cylinder pipe 31 by a rib piece 51b that is appropriately provided at a position that does not obstruct the nozzle hole 50 with the inner peripheral surface of the inner cylinder pipe 31. The rib piece 51b is also provided on the inner peripheral surface of the exhaust gas ejection pipe 51 so that the catalyst 4 built in the exhaust gas ejection pipe 51 can be held. In a state where the catalyst 4 is held, a thermometer is passed between the catalyst 4 and the lid 51a through the outer cylinder pipe 32 and the inner cylinder pipe 31 of the heat exchanger 3 and the exhaust gas ejection pipe 51. 6 is provided. The catalyst 4 is desirably temperature-controlled because the purification action may not function effectively depending on the exhaust gas temperature, but the temperature of the catalyst 4 is measured by the thermometer 6 at a position immediately after passing through the catalyst 4. The purification state can be grasped to some extent.

The connecting member 52 is further reduced in diameter from the cylindrical main body 52a portion to form an exhaust gas ejection pipe connecting portion 52b. The portion of the main body 52 a having the maximum diameter is fixed to the inner peripheral surface of the inner tube 31 on the downstream side adjacent to the exhaust gas ejection pipe 51. The exhaust gas ejection pipe connecting portion 52b is connected to the exhaust gas ejection pipe 53 constituting the unit exhaust gas passage 5b of the next stage on the outside thereof, and is spaced between the inner cylinder pipe 31 and the exhaust gas ejection pipe 53. d is formed.

As a result, the unit exhaust gas passage 5a has the first exhaust gas passage A in which the exhaust gas that has passed through the catalyst is stopped by the lid 51a and ejected from the nozzle hole 50, and after being ejected from the nozzle hole 50, A second exhaust gas passage B is formed which passes through the gap d between the exhaust gas ejection pipe 51 and the inner cylinder pipe 31 and allows the exhaust gas to pass from the ejection pipe connection portion 52b of the connection member 52 to the ejection pipe 53 of the next stage. Will be.

The unit exhaust gas passage 5 b is configured by an exhaust gas ejection pipe 53 connected to the exhaust gas ejection pipe connection portion 52 b of the connection member 52 and a connection member 54 provided on the downstream side of the exhaust gas ejection pipe 53. Yes.

The exhaust gas ejection pipe 53 is formed in a cylindrical shape capable of forming a gap d with the inner cylinder pipe 31. A plurality of nozzle holes 50 are provided in the circumferential wall of the exhaust gas ejection pipe 53 at equal intervals along the longitudinal direction and the circumferential direction. Further, the exhaust gas ejection pipe 53 is closed at the downstream end by a lid 53a. The exhaust gas ejection pipe 53 is fixed in the inner cylinder pipe 31 by a rib piece 53b provided at the position of the outer peripheral surface of the downstream end that does not interfere with the nozzle hole 50 between the exhaust gas ejection pipe 53 and the inner circumference surface of the inner cylinder pipe 31. The

The connecting member 54 is further reduced in diameter from the cylindrical main body 54a portion to form an exhaust gas ejection pipe connecting portion 54b. The portion of the main body 54 a having the maximum diameter is fixed to the inner peripheral surface of the inner tube 31 on the downstream side adjacent to the exhaust gas ejection tube 53. The exhaust gas ejection pipe connecting portion 54b is connected to the outside thereof by receiving and connecting an exhaust gas ejection pipe 55 constituting the unit exhaust gas passage 5c of the next stage, and is spaced between the inner tube 31 and the exhaust gas ejection pipe 55. d is formed.

Thereby, the unit exhaust gas passage 5b includes the first exhaust gas passage A configured such that the exhaust gas that has passed through the ejection pipe connection portion 52b of the connection member 52 is stopped by the lid 53a and is ejected from the nozzle hole 50. After ejecting from the nozzle hole 50, the second gas passes through the gap d between the exhaust gas ejection pipe 53 and the inner cylinder pipe 31, and passes the exhaust gas from the ejection pipe connection portion 54 b of the connection member 54 to the ejection pipe 55 of the next stage. The exhaust gas passage B is formed.

The unit exhaust gas passage 5c includes an exhaust gas ejection pipe 55 connected to the exhaust gas ejection pipe connection portion 54b of the connection member 54 and an exhaust gas outflow pipe 36.

The exhaust gas ejection pipe 55 is formed in a cylindrical shape capable of forming a gap d with the inner cylinder pipe 31. A plurality of nozzle holes 50 are provided in the circumferential wall of the exhaust gas ejection pipe 55 at equal intervals along the longitudinal direction and the circumferential direction. Further, the length of the exhaust gas ejection pipe 55 is adjusted so that the downstream end is closed by the inner lid 31 b on the other end side of the heat exchanger 3. The downstream end portion of the exhaust gas ejection pipe 55 is fixed to the inner lid 31 b on the other end side of the heat exchanger 3.

As a result, the unit exhaust gas passage 5c includes the first exhaust gas passage A configured such that the exhaust gas that has passed through the ejection pipe connection portion 54b of the connection member 54 stops at the inner lid 31b and is ejected from the nozzle hole 50. After ejection from the nozzle hole 50, a second exhaust gas passage B that passes through the gap d between the exhaust gas ejection pipe 53 and the inner cylinder pipe 31 and is exhausted from the exhaust gas outflow pipe 36 is formed.

According to the engine exhaust gas heat exchanger 1 configured as described above, exhaust gas from the engine passes through the exhaust gas inflow pipe 35, the front chamber 2, the catalyst 4, and the unit

exhaust gas passages

5a, 5b, and 5c, and the exhaust gas. The air is exhausted from the outflow pipe 36.

At this time, the exhaust gas is not ejected all at once from the nozzle holes 50, but is ejected from the nozzle holes 50 of the unit exhaust gas passage 5a and then recovered, and the nozzle holes of the next unit exhaust gas passage 5b are collected. After being ejected from the nozzle 50, it is recovered again and ejected from the nozzle hole 50 of the unit exhaust gas passage 5c at the next stage, so that it is ejected from the nozzle hole 50 toward the inner tube 31 of the heat exchanger 3. The exhaust gas injection speed can be kept constant without being lowered in each unit

exhaust gas passage

5a, 5b, 5c. Therefore, it is possible to prevent a decrease in the flow velocity per nozzle hole 50 and maintain a predetermined average heat passage rate (K value).

Further, since the front chamber 2 forms a gap S between the pipe material 21 and the inner cylinder pipe 31, the exhaust gas flowing in from the exhaust gas inflow pipe 35 is cooled by the cooling water via the inner cylinder pipe 31. Can be prevented. Therefore, it is possible to prevent the temperature of the exhaust gas before flowing into the catalyst 4 from decreasing and activate the reaction at the catalyst 4.

In the case of the present embodiment, a gap S is formed between the pipe material 21 and the inner cylindrical pipe 31, but the position where the exhaust gas flowing into the front chamber 2 from the exhaust gas inflow pipe 35 collides, that is, Since the exhaust gas is positively sprayed to the position of the pipe member 21 on the extension line from the exhaust gas inflow pipe 35, the above-described gap S may be formed only at this position.

In the present embodiment, a gap S is formed between the pipe material 21 constituting the front chamber 2 and the inner cylindrical pipe 31, and this gap S is a gap between the pipe material 21 and the inner cylindrical pipe 31. A portion of the main body 22a of the connection member 22 provided to maintain S is extended and the main body 22a is mounted, that is, a three-layer structure of the inner tube 31, the main body 22a, and the pipe material 21. It may be. In addition, a suitable heat insulating material may be provided in the gap S.

Further, in the present embodiment, the gap S is formed between the tube material 21 constituting the front chamber 2 and the inner cylinder pipe 31, but the gap S between the tube material 21 and the inner cylinder pipe 31 is maintained. A multilayer board having a two-layer structure in which the tube material 21 and the inner tube 31 are directly in close contact with each other without the connection member 22 provided therebetween may be used. In this case, there is no gap S, but it is possible to prevent contact thermal resistance from being generated at the joint between the tube material 21 and the inner tube 31 and being cooled by the cooling water.

Further, in the case of the present embodiment, as described above, the exhaust gas from the exhaust gas inflow pipe 35 is positively blown to the position of the pipe member 21 on the extension line of the exhaust gas inflow pipe 35 and drifts in the front chamber 2. Will be. Therefore, as shown in FIG. 4, a rectifying member 23 for preventing the drift of the exhaust gas flowing into the catalyst 4 may be provided in the front chamber 2. The rectifying member 23 is formed in a cylindrical shape that connects the inner lid 31a on one end side of the heat exchanger 3 and the catalyst 4, and the exhaust gas inlets 23a are provided at a plurality of locations at equal intervals on the entire outer periphery. Is provided. However, the exhaust gas inlet 23 a is provided so as to be disengaged from the position of the rectifying member 23 that hits the extended line of the exhaust gas inflow pipe 35. 4, the same members as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.

By providing the rectifying member 23, the exhaust gas flowing into the front chamber 2 can be circulated around the rectifying member 23 and then flowed into the catalyst 4 through the exhaust gas inlet 23a. The drift in 2 can be prevented. The rectifying member 23 may be configured such that the catalyst connecting portion 22c of the connecting member 22 extends toward the rectifying member 23 and the connecting member 22 and the rectifying member 23 are integrated. .

The present invention can be implemented in various other forms without departing from the spirit or main features thereof. For this reason, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

The present invention can be used as an exhaust gas heat exchanger for various engines used in air conditioners and cogeneration systems.

1 Engine exhaust gas heat exchanger with built-in catalyst 11 Engine 2 Front chamber (catalyst inlet)
21 Tube material (multilayer board)
22a body (multilayer board)
23 Rectification member (surrounding wall)
23a Exhaust gas inlet 3 Heat exchanger 31 Inner tube (multilayer plate)
35 Gas inflow pipe 4 Engine exhaust gas purification catalyst S Air gap

Claims

A heat exchanger between an engine exhaust gas and cooling water, and a built-in catalyst type engine exhaust gas heat exchanger with a built-in exhaust gas purification catalyst,
An engine exhaust gas heat exchanger with a built-in catalyst, wherein all or part of the partition wall of the catalyst inflow portion is formed of a multilayer plate.
The engine exhaust gas heat exchanger with built-in catalyst according to claim 1, wherein the inner plate and the outer plate of the multilayer plate are separated from each other.
In a heat exchanger between an engine exhaust gas and cooling water, the catalyst built-in engine exhaust gas heat exchanger that allows exhaust gas to flow in from the radial direction of the built-in exhaust gas purification catalyst,
Built-in catalyst characterized by extending the peripheral wall supporting the catalyst on the catalyst inflow side or providing a separate peripheral wall and providing a plurality of exhaust gas inlets in the circumferential direction of the peripheral wall excluding the facing part with the exhaust gas inlet Engine exhaust gas heat exchanger.
An energy supply apparatus such as an engine-driven heat pump and a cogeneration system, wherein the catalyst exhaust type engine exhaust gas heat exchanger according to any one of claims 1 to 3 is used for an engine exhaust gas path. apparatus.