JP5911169B2 - Heat exchanger - Google Patents

Description

  The present invention enables heat exchange between exhaust heat and clean water by the exhaust heat exchange means, and enables heat exchange between cooling water and clean water by the cooling water heat exchange means, and heat water is heated by each heat exchange. Relates to possible heat exchangers.

As a heat exchanger, a pair of cores are housed in the case at a predetermined interval, the first fluid can be flown into the case, and the second fluid and the third fluid can flow into the pair of cores, respectively. What is formed in is known.
According to this heat exchanger, the second fluid and the third fluid can be caused to flow through the pair of cores, respectively, and the first fluid that has flowed into the case can be guided to the outside of the pair of cores.
By guiding the first fluid to the outside of the pair of cores, heat exchange can be performed between the first fluid and the second fluid, and heat exchange can be performed between the first fluid and the third fluid (for example, Patent Documents). 1).

Japanese Patent Laid-Open No. 2006-200861

However, in the heat exchanger of Patent Document 1, the first fluid that has flowed into the case is adjacent to the outside of the case via the case wall (case wall).
Therefore, it is conceivable that the heat of the first fluid flowing into the case is radiated from the inside of the case to the outside through the case wall.
For this reason, it is difficult to perform heat exchange between the first fluid and the second fluid and heat exchange between the first fluid and the third fluid.

  This invention makes it a subject to provide the heat exchanger which can perform heat exchange favorable.

According to a first aspect of the present invention, there is provided an exhaust heat exchanging means communicating with an exhaust pipe provided in an engine so that exhaust gas can be introduced and exchanging heat between exhaust heat of the exhaust gas and clean water, and the exhaust heat exchanging means. Cooling water heat exchanging means provided integrally with the engine and capable of exchanging heat between the cooling water of the engine and the clean water. The exhaust heat exchanging means communicates with the exhaust pipe and is guided from the exhaust pipe. A cylindrical catalyst that can purify the exhaust gas extracted from the outlet and guide the exhaust gas led out from the outlet along the outer periphery of the catalyst, and the guided exhaust gas is provided on the outlet side. An exhaust gas passage that can be discharged from the exhaust gas outlet, an upper water passage that can guide the clean water along an outer peripheral side of the exhaust gas passage, an inside of the clean water passage, and an outlet of the catalyst And heat insulation provided between the exhaust gas outlets A The inter, the exhaust gas passage, covers the peripheral wall of the cylindrical of the catalyst from the outside, inside the exhaust gas passage of an annular provided between the inner tube provided in the cylindrical of the catalyst coaxially And an annular outer exhaust gas passage that covers the inner cylinder from the outside and is provided coaxially with the inner cylinder and between the intermediate cylinders. A water passage is provided radially, the outside of the intermediate cylinder is covered with a first outer cylinder, an annular outer water passage is provided between the intermediate cylinder and the first outer cylinder, and the inner upper water passage and the outer upper water passage are provided. The second outer cylinder is covered with the second outer cylinder in communication with the water passage, and an annular cooling water passage is provided between the second outer cylinder and the first outer cylinder .

  According to a second aspect of the present invention, condensed water discharge means for discharging condensed water separated from the exhaust gas is provided in the vicinity of the outlet of the catalyst.

In the invention according to claim 1, the exhaust heat exchange means and the cooling water heat exchange means are provided integrally. Exhaust heat exchange means enables heat exchange between exhaust heat and clean water, and cooling water heat exchange means enables heat exchange between cooling water and clean water.
Thus, by providing the exhaust heat exchange means and the cooling water heat exchange means integrally, it is possible to reduce the size and cost of the heat exchanger.

Further, in the exhaust heat exchange means, a tubular catalyst was communicated with the exhaust pipe, and an exhaust gas outlet was provided on the outlet side of the catalyst. Further, the exhaust gas led out from the catalyst outlet is guided along the outer periphery of the catalyst in the exhaust gas passage, and the guided exhaust gas can be discharged from the exhaust gas outlet.
Furthermore, a clean water passage is provided along the outer peripheral side of the exhaust gas passage so that the clean water can be guided along the outer peripheral side of the exhaust gas passage.
As a result, the exhaust gas and the clean water can be guided adjacent to each other, so that heat exchange can be performed between the exhaust heat of the exhaust gas and the clean water.

Here, a heat insulating space was provided between the catalyst outlet (hereinafter referred to as “catalyst outlet”) and the exhaust gas outlet. Therefore, the exhaust gas guided to the catalyst outlet side can be separated from the exhaust gas guided to the exhaust gas outlet.
Thereby, it is possible to prevent the exhaust heat of the exhaust gas guided to the catalyst outlet side from being received by the exhaust gas guided to the exhaust gas outlet, and to suppress the heat radiation of the exhaust heat on the catalyst outlet side.
In this way, by suppressing the heat radiation of the exhaust heat on the catalyst outlet side, the heat exchange between the exhaust heat of the exhaust gas and the clean water can be performed satisfactorily.
In the present invention, the cooling water passage for cooling water is provided on the outer peripheral side of the exhaust heat exchange means. Since the exhaust heat exchange means includes the clean water passage, the cooling water passage can be provided on the outer peripheral side of the clean water passage.
Thus, the clean water passage can be disposed between the cooling water passage and the exhaust gas passage, so that the clean water can be guided between the cooling water and the exhaust gas.
By guiding the clean water between the cooling water and the exhaust gas, the heat of the clean water can be prevented from being dissipated, so that the clean water can be efficiently heated.
Further, by guiding the clean water between the cooling water and the exhaust gas, the cooling water can be separated from the exhaust gas.
Therefore, heat exchange between the cooling water and the exhaust gas can be prevented. Thereby, since the temperature of a cooling water can be kept below a boiling point (100 degreeC), deterioration of a cooling water can be suppressed.

In the invention according to claim 2, the condensed water discharging means is provided in the vicinity of the outlet of the catalyst, and the condensed water separated from the exhaust gas by the condensed water discharging means is drained.
Thereby, when performing heat exchange between the exhaust heat of exhaust gas and clean water, the condensed water separated from the exhaust gas can be easily removed from the inside of the heat exchanger.

It is a perspective view which shows the heat exchanger of Example 1 which concerns on this invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a view taken in the direction of arrow 4 in FIG. 2. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is an enlarged view of 6 parts in FIG. 5. It is a figure explaining the example which guides exhaust gas to the exhaust-gas channel | path of Example 1. FIG. It is a figure explaining the example which guides cooling water to the cooling water channel | path of Example 1. FIG. It is a figure explaining the example which guides clean water to the clean water path of Example 1. FIG. It is a figure explaining the example which heats clean water with the heat exchanger of Example 1. FIG. It is a figure explaining the example which removes condensed water with the condensed water discharge means of Example 1. FIG. It is a perspective view which shows the heat exchanger of Example 2 which concerns on this invention. It is a perspective view which shows the heat exchanger of Example 3 which concerns on this invention.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

The heat exchanger 10 according to the first embodiment will be described.
As shown in FIG. 1, the heat exchanger 10 is provided in a cogeneration system (cogeneration system) Co, and heats clean water using exhaust heat of the engine 11.
The heated tap water is used, for example, as hot water supply indoors.

  The heat exchanger 10 includes exhaust heat exchange means 12 that can exchange heat between exhaust heat of exhaust gas and clean water, cooling water heat exchange means 13 that can exchange heat between cooling water and clean water of the engine 11, And condensed water discharge means 14 for discharging condensed water separated from the exhaust gas.

As shown in FIG. 2, the exhaust heat exchange means 12 is provided so that exhaust gas can be introduced from an exhaust pipe 16 provided in the engine 11 (see FIG. 1) of the cogeneration apparatus Co.
The exhaust heat exchanging means 12 converts a tubular (honeycomb) catalyst 21 communicated with the exhaust pipe 16 and exhaust gas led out from a catalyst outlet (exit) 22 of the catalyst 21 into a peripheral wall (outer periphery) 21 a of the catalyst 21. Is provided between the catalyst outlet 22 and the exhaust gas outlet 28. The exhaust gas passage 25 can be guided along the outer peripheral wall 25a of the exhaust gas passage 25. And a space 36.

The catalyst 21 is formed in a honeycomb-like cylindrical body, a central upper inner cover 41 is provided at the upper end portion 21b, a catalyst inlet 23 is opened at the central upper inner cover 41, and a catalyst outlet 22 is opened at the lower end portion 21c. Yes.
The exhaust pipe 16 communicates with the catalyst inlet 23 by attaching the flange 43 of the exhaust pipe 16 to the flange 42 of the catalyst inlet 23 with bolts 44 and nuts 45.
Therefore, the exhaust gas guided from the catalyst inlet 23 through the exhaust pipe 16 can be purified by the catalyst 21, and the purified exhaust gas can be guided from the catalyst outlet 22 to the exhaust gas passage 25.

  The exhaust gas passage 25 includes an annular inner exhaust gas passage 26 that communicates with the catalyst 21, an annular outer exhaust gas passage 27 that communicates with the inner exhaust gas passage 26, and an exhaust gas that communicates with the outer exhaust gas passage 27. And an outlet 28.

Here, the inner cylinder 47 is provided coaxially so as to cover the peripheral wall 21 a of the catalyst 21 from the outside, whereby an annular first space 48 is formed between the peripheral wall 21 a of the catalyst 21 and the inner cylinder 47.
That is, the inner exhaust gas passage 26 is formed in an annular shape along the catalyst 21 by the peripheral wall 21 a and the inner cylinder 47 of the catalyst 21.

The inner exhaust gas passage 26 is closed at the upper end portion 26a by the central upper inner cover 41 and at the lower end portion 26b by the central lower inner cover 51.
The center lower inner cover 51 is provided below the catalyst outlet 22 at a predetermined interval. Therefore, the lower end portion 26b of the inner exhaust gas passage 26 is opened.

As a result, the lower end portion 26 b of the inner exhaust gas passage 26 is disposed in a state of being opened at the same height position as the catalyst outlet 22, and communicates with the catalyst outlet 22.
In the inner exhaust gas passage 26, in the vicinity of the upper end portion 26a, a plurality of gas upper passage ports 53 are opened in the inner cylinder 47 at predetermined intervals along the circumferential direction.

The intermediate cylinder 55 is provided coaxially so as to cover the inner exhaust gas passage 26 (specifically, the inner cylinder 47) from the outside, so that an annular second space 56 is formed between the inner cylinder 47 and the intermediate cylinder 55. Has been.
That is, the outer exhaust gas passage 27 is formed annularly along the inner exhaust gas passage 26 in the inner cylinder 47 and the intermediate cylinder 55.
The outer exhaust gas passage 27 communicates with the vicinity of the upper end portion 26 a of the inner exhaust gas passage 26 through a plurality of gas upper passage ports 53.

The outer exhaust gas passage 27 has an upper end portion 27 a closed by an intermediate upper inner cover 58 and a lower end portion 27 b closed by an intermediate lower inner cover 59.
Further, in the outer exhaust gas passage 27, a plurality of gas lower passage ports 54 are opened at predetermined intervals along the circumferential direction in the inner cylinder 47 at the lower end portion 27b.
Therefore, the lower end portion 27 b of the outer exhaust gas passage 27 communicates with the exhaust gas outlet 28 through the plurality of gas lower passage ports 54.

The exhaust gas outlet 28 is provided inside the outer exhaust gas passage 27 at the lower end portion 27b of the outer exhaust gas passage 27 formed in an annular shape and below the catalyst outlet 22 side.
That is, the exhaust gas outlet 28 is formed by an exhaust gas introduction part 64 provided below the catalyst outlet 22 side and a gas outlet pipe 65 communicated with the exhaust gas introduction part 64.

The exhaust gas introduction portion 64 includes a lower portion 47a of the inner cylinder 47, a central lower inner cover 62 provided at an upper end portion (above the plurality of gas lower passage ports 54) 47b of the lower portion 47a, and a lower end portion of the lower portion 47a ( It is formed of a central lower inner / outer cover 63 provided in a lower portion 47c (below the plurality of lower gas passage openings 54).
An exhaust space 66 is formed by the lower portion 47 a of the inner cylinder 47, the center lower inner / inner cover 62 and the center lower inner / outer cover 63, and the exhaust space 66 passes through a plurality of gas lower passage ports 54 to the lower end portion 27 b of the outer exhaust gas passage 27. It is communicated.

The exhaust space 66 is communicated with the gas outlet pipe 65 by supporting the gas outlet pipe 65 in a state where the base end portion 65 a is inserted into the through hole 63 a of the center lower inner / outer cover 63.
Therefore, the gas outlet pipe 65 communicates with the lower end portion 27 b of the outer exhaust gas passage 27 through the exhaust space 66 and the plurality of gas lower passage ports 54.

Thereby, the exhaust gas led out from the catalyst outlet 22 can be guided from the lower end portion 26 b of the inner exhaust gas passage 26 to the inner exhaust gas passage 26. Further, the exhaust gas guided to the inner exhaust gas passage 26 can be guided to the upper end portion 27 a of the outer exhaust gas passage 27 through the inner exhaust gas passage 26 and the plurality of gas upper passage ports 53.
Further, the exhaust gas guided to the upper end portion 27 a of the outer exhaust gas passage 27 can be guided to the exhaust space 66 of the exhaust gas outlet 28 through the outer exhaust gas passage 27 and the plurality of gas lower passage ports 54.
In addition, the exhaust gas guided to the exhaust space 66 can be discharged from the gas outlet pipe 65 to the outside of the heat exchanger 10.

Here, a heat insulating space 36 is provided between the catalyst outlet 22 and the exhaust gas outlet 28.
The heat insulation space portion 36 is formed in a hollow shape by the center lower inner cover 51, the center lower inner middle cover 62 and the lower vicinity portion 47d of the inner cylinder 47, and a sealed space 37 formed by the members 51, 62, 47, 47d. Have
The heat insulating space 36 is provided between the catalyst outlet 22 and the exhaust gas outlet 28 inside the outer exhaust gas passage 27.
By providing the heat insulating space 36 inside the outer exhaust gas passage 27, the heat insulating space 36 is arranged inside the inner water supply passage 33.

Thus, by providing the heat insulating space 36 between the catalyst outlet 22 and the exhaust gas outlet 28, a hollow heat insulating space is provided between the exhaust gas led to the catalyst outlet 22 side and the exhaust gas led to the exhaust gas outlet 28. The part 36 can be interposed.
Thus, the heat insulation space 36 prevents the exhaust heat of the exhaust gas guided to the catalyst outlet 22 side from being received by the exhaust gas guided to the exhaust gas outlet 28, and the heat release of the exhaust heat on the catalyst outlet 22 side is prevented. Can be suppressed.

A water supply passage 31 is provided on the outer peripheral wall (outer periphery) 25 a side of the exhaust gas passage 25.
The water supply passage 31 includes an annular outer water supply passage 32 communicated with a water supply portion (not shown), an inner water supply passage 33 communicated with the outer water supply passage 32, and an inner water supply passage 33. A water outlet 34 is provided.

Here, the first outer cylinder 71 is provided on the same axis so as to cover the outer exhaust gas passage 27 (specifically, the intermediate cylinder 55) from the outside, so that an annular shape is formed between the intermediate cylinder 55 and the first outer cylinder 71. The third space 72 is formed.
That is, the outer upper water passage 32 is formed in an annular shape along the outer exhaust gas passage 27 in the intermediate tube 55 and the first outer tube 71.

The outer upper water passage 32 has an upper end 32a closed by an intermediate upper outer cover 74 and an intermediate lower outer cover 75 provided at the lower end 32b.
The intermediate lower outer cover 75 is provided across the lower end portion 47 c of the inner cylinder 47 and the lower end portion 71 a of the first outer cylinder 71, and is disposed below the intermediate lower inner cover 59 with a predetermined interval.
Therefore, a space is formed between the intermediate lower inner cover 59 and the intermediate lower outer cover 75, and the upper water communication path 77 is formed by the intermediate lower inner cover 59 and the intermediate lower outer cover 75.

Thereby, the lower end portion 32 b of the outer upper water passage 32 is communicated with the lower end portion 33 a of the inner upper water passage 33 through the upper water communication passage 77.
Further, in the outer upper water passage 32, a upper water passage port 78 is formed at an upper end portion 32a (specifically, an upper end portion of the first outer cylinder 71). A water supply pipe 79 is connected to the water supply passage opening 78, and a water supply unit (not shown) is connected to the water supply pipe 79 via the water supply passage 18.
Therefore, the outer upper water passage 32 is communicated with the upper water supply section through the upper water introduction pipe 79 and the upper water supply passage 18.

As shown in FIGS. 2 and 3, the inner clean water passage 33 is composed of a plurality of clean water pipes 83 provided inside the outer exhaust gas passage 27.
The plurality of water pipes 83 are accommodated between the inner cylinder 47 and the intermediate cylinder 55 (that is, inside the outer exhaust gas passage 27), the upper end portion 83a is inserted into the through hole 58a of the intermediate upper inner cover 58, and the lower end portion 83 b is inserted into the through hole 59 a of the intermediate lower inner cover 59.
Therefore, a plurality of water pipes 83 are supported by the intermediate upper inner cover 58 and the intermediate lower inner cover 59.

In other words, the inner upper water passage 33 is predetermined in the circumferential direction of the inner cylinder 47 and the intermediate cylinder 55 (arrow direction shown in FIG. 3) in a state where a plurality of water pipes 83 are accommodated in the outer exhaust gas passage 27. It is provided at intervals.
Further, in the inner upper water passage 33, the lower end portions 83 b of the plurality of upper water pipes 83 are communicated with the upper water communication passage 77, and the upper end portions 83 a of the plurality of upper water pipes 83 are connected to the upper water upper communication passage of the upper water outlet 34. 85.
The upper water communication passage 85 is formed in an annular shape by an upper part 47 e of the inner cylinder 47, an upper part 55 a of the intermediate cylinder 55, an intermediate upper inner cover 58 and an intermediate upper and outer cover 74.

The upper water outlet 34 has an upper water communication passage 85 communicated with the upper ends 83 a of a plurality of upper water pipes 83, and an upper water outlet pipe 86 communicated with the upper water communication passage 85.
As shown in FIGS. 2 and 4, the water discharge pipe 86 is supported upward from the intermediate upper / outer cover 74 while being inserted into the through hole 74 a of the intermediate upper / outer cover 74.

Therefore, the clean water that has passed through the clean water introduction pipe 79 can be guided from the upper end portion 32 a of the external clean water passage 32 to the external clean water passage 32. Further, the clean water guided to the outer clean water passage 32 can be guided to the lower end 33 a of the inner clean water passage 33 through the outer clean water passage 32 and the clean water communication passage 77.
Furthermore, the clean water guided to the lower end portion 33 a of the inner clean water passage 33 can be guided from the upper end portion 33 b of the inner clean water passage 33 to the clean water communication passage 85. In addition, the clean water guided to the clean water communication passage 85 can be led out from the clean water outlet pipe 86 to the outside (that is, an indoor hot water supply section or the like).
In this way, by guiding the clean water to the inner clean water passage 33, the clean water can be guided along the exhaust gas passage 25 (outer exhaust gas passage 27).

Thus, the exhaust gas is guided to the exhaust gas passage 25 of the exhaust heat exchange means 12 and the fresh water is guided to the inner fresh water passage 33, whereby the exhaust gas guided to the exhaust gas passage 25 and the inner fresh water passage 33 are guided. Heat exchange can be performed between clean water guided by
Cooling water heat exchanging means 13 is provided integrally with the exhaust heat exchanging means 12.

As shown in FIG. 2, the cooling water heat exchanging means 13 is provided so that cooling water can be introduced from a cooling water channel 17 (see FIG. 1) provided in the engine 11 of the cogeneration apparatus Co.
In this cooling water heat exchanging means 13, an upper introduction pipe 93 is communicated with an outlet 17 a (see FIG. 1) of the cooling water path 17 and a lower outlet pipe 94 is communicated with an inlet 17 b (see FIG. 1) of the cooling water path 17. A cooling water passage 91 and an upper water passage 31 capable of guiding fresh water along the inner peripheral side of the cooling water passage 91 are provided.
That is, the clean water passage 31 is shared by both the exhaust heat exchange means 12 and the cooling water heat exchange means 13.

Thus, by providing the exhaust heat exchange means 12 and the cooling water heat exchange means 13 of the heat exchanger 10 in an integrated manner, the heat exchanger 10 can be reduced in size and cost.
In addition, the water supply passage 31 serves as both the exhaust heat exchange means 12 and the cooling water heat exchange means 13, thereby further reducing the size and cost of the heat exchanger 10. be able to.
Thereby, size reduction and cost reduction of the cogeneration apparatus Co (refer FIG. 1) can be achieved.

  The cooling water passage 91 includes an annular cooling water passage 92 provided on the outer periphery of the outer upper water passage 32, an upper introduction pipe 93 communicating with the upper end portion 92 a of the annular cooling water passage 92, and a lower end of the annular cooling water passage 92. And a lower outlet tube 94 communicated with the portion 92b.

Here, by providing the second outer cylinder 96 coaxially so as to cover the first outer cylinder 71 from the outside, an annular fourth space 97 is formed between the first outer cylinder 71 and the second outer cylinder 96. ing.
That is, in the first outer cylinder 71 and the second outer cylinder 96, the annular cooling water passage 92 is formed in an annular shape along the outer upper water passage 32.

The annular cooling water passage 92 is provided in the outer peripheral wall (outer periphery of the exhaust heat exchange means 12) 32 c of the outer clean water passage 32.
Furthermore, the upper end portion 92 a of the annular cooling water passage 92 is closed by the upper bent portion 96 a of the second outer cylinder 96, and the lower end portion 92 b is closed by the lower bent portion 96 b of the second outer cylinder 96.

An introduction port 98 is formed at the upper end of the second outer cylinder 96, and the upper introduction tube 93 is inserted into the introduction port 98 and supported. Therefore, the upper introduction pipe 93 is communicated with the upper end portion 92 a of the annular cooling water passage 92 through the introduction port 98.
A lead-out port 99 is formed at the lower end of the second outer cylinder 96, and the lower lead-out tube 94 is inserted into the lead-out port 99 and supported. Therefore, the lower outlet pipe 94 is communicated with the lower end portion 92 b of the annular cooling water passage 92 through the outlet port 99.

Therefore, the cooling water is guided from the outlet 17a of the cooling water passage 17 (see FIG. 1) to the upper introduction pipe 93, and the guided cooling water is passed through the upper introduction pipe 93 from the upper end portion 92a of the annular cooling water passage 92. It can be guided to the passage 92.
Further, the cooling water guided to the annular cooling water passage 92 can be guided from the lower end portion 92 b to the lower outlet pipe 94 through the annular cooling water passage 92.
Further, the cooling water guided to the lower outlet pipe 94 can be returned to the cooling water path 17 via the lower outlet pipe 94 and the inlet 17b of the cooling water path 17 (see FIG. 1).

  As a result, the cooling water is guided to the cooling water passage 91 of the cooling water heat exchanging means 13 and the fresh water is guided to the outer upper water passage 32, so that the cooling water and the outer upper water passage guided to the cooling water passage 91 are guided. Heat exchange can be performed between the clean water guided to 32.

As shown in FIGS. 5 and 6, the condensed water discharge means 14 is provided in the vicinity of the catalyst outlet 22 of the exhaust heat exchange means 12.
The condensed water discharge means 14 is constituted by a discharge pipe 105 provided with an upper end portion 105 a so as to face the catalyst outlet 22.

That is, a recess 52 that is recessed downward is formed in the center lower inner cover 51, and an extraction hole 51 a is formed in the bottom 52 a of the recess 52. An upper bent portion 105b of the discharge pipe 105 is provided on the bottom 52a from below.
Thereby, the upper end part 105a of the discharge pipe 105 is coaxially arrange | positioned at the extraction hole 51a.

Further, a support portion 105 c that is separated from the upper end portion 105 a of the discharge pipe 105 by a predetermined distance is supported in a state of being penetrated through the support hole 63 b of the center lower inner / outer cover 63.
Further, a portion 105 d between the upper end portion 105 a and the support portion 105 c of the discharge pipe 105 is passed through the through hole 62 a of the center lower inner cover 62.

Therefore, the upper end portion 105 a of the discharge pipe 105 is provided so as to face the catalyst outlet 22 through the extraction hole 51 a of the center lower inner cover 51.
Thereby, the condensed water separated from the exhaust gas can be discharged to the outside of the heat exchanger 10 by the discharge pipe 105 (that is, the condensed water discharge means 14).

Next, an example in which clean water is heated using the heat exchanger 10 will be described with reference to FIGS.
As shown in FIG. 7, by driving the cogeneration system Co (see FIG. 1), the exhaust gas of the engine 11 (see FIG. 1) is guided from the catalyst inlet 23 into the catalyst 21 as indicated by the arrow A.
The guided exhaust gas is purified by the catalyst 21 and guided as indicated by an arrow B from the catalyst outlet 22 toward the lower end portion 26b of the inner exhaust gas passage 26. The guided exhaust gas is guided to the inner exhaust gas passage 26 through the lower end portion 26b of the inner exhaust gas passage 26 as indicated by an arrow C.

The guided exhaust gas is guided as shown by an arrow D to the upper end portion 27a of the outer exhaust gas passage 27 through the inner exhaust gas passage 26 and the plurality of gas upper passage ports 53.
The guided exhaust gas is guided to the plurality of gas lower passage ports 54 in the outer exhaust gas passage 27 as indicated by the arrow E, and the arrow F passes through the gas lower passage ports 54 to the exhaust space 66 of the exhaust gas outlet 28. It is guided as follows.
The guided exhaust gas is discharged from the gas outlet pipe 65 to the outside of the heat exchanger 10 as indicated by an arrow G.

As shown in FIG. 8, the cooling water of the engine 11 (see FIG. 1) is guided to the upper introduction pipe 93 as indicated by an arrow H. The guided cooling water is guided to the annular cooling water passage 92 from the upper end portion 92 a of the annular cooling water passage 92 through the upper introduction pipe 93 as indicated by an arrow I.
The guided cooling water is guided to the lower outlet pipe 94 from the lower end portion 92b through the annular cooling water passage 92 as indicated by an arrow J.
The guided cooling water is returned to the cooling water passage 17 (see FIG. 1) of the engine 11 through the lower outlet pipe 94 as indicated by an arrow K.

As shown in FIG. 9, the clean water of the clean water supply section is guided to the clean water introduction pipe 79 as indicated by an arrow L. The guided clean water is guided through the clean water introduction pipe 79 from the upper end portion 32a of the external clean water passage 32 to the external clean water passage 32 as indicated by an arrow M.
The guided clean water is guided to the lower end 32b of the external clean water passage 32 through the external clean water passage 32 as indicated by an arrow N.

Here, as shown in FIG. 10, the clean water of the outer clean water passage 32 is guided along the annular cooling water passage 92.
Thus, heat exchange is performed between the cooling water guided to the annular cooling water passage 92 and the clean water guided to the outer clean water passage 32, and the clean water is heated from the temperature T1 to the temperature T2.

As shown in FIG. 9, the upper water heated to the temperature T2 passes through the lower end 32b of the outer upper water passage 32 and the lower water communication passage 77, and the lower end of the inner upper water passage 33 (plural water pipes 83). It is guided to 33a as indicated by an arrow O.
The guided clean water is guided through the inner clean water passage 33 to the upper end portion 33b of the inner clean water passage 33 as indicated by an arrow P.

Here, as shown in FIG. 10, the upper water of the inner upper water passage 33 is guided along the outer exhaust gas passage 27.
Thereby, heat exchange is performed between the exhaust gas guided to the outer exhaust gas passage 27 and the clean water guided to the inner clean water passage 33.
The exhaust gas has a higher temperature than the cooling water, and heat exchange is performed between the exhaust gas and the clean water, whereby the clean water is heated from the temperature T2 to the temperature T3.
In this way, first, the water is heated from the temperature T1 to the temperature T2 with the cooling water, and then the water heated to the temperature T2 is heated from the temperature T2 to the temperature T3 with the exhaust gas. Water can be efficiently heated with the heat of the gas.
The heated tap water is used, for example, as hot water supply indoors.

By the way, a hollow heat insulating space 36 is provided between the catalyst outlet 22 and the exhaust gas outlet 28. Therefore, the hollow heat insulating space 36 can be interposed between the exhaust gas guided to the catalyst outlet 22 side and the exhaust gas guided to the exhaust gas outlet 28.
Thereby, the exhaust gas guided to the catalyst outlet 22 side can be separated from the exhaust gas guided to the exhaust gas outlet 28.

Therefore, the exhaust heat of the exhaust gas guided to the catalyst outlet 22 side can be prevented from being received by the exhaust gas guided to the exhaust gas outlet 28, and the heat dissipation of the exhaust heat on the catalyst outlet 22 side can be suppressed.
In this way, by suppressing the heat dissipation of the exhaust heat on the catalyst outlet 22 side, the heat exchange between the exhaust heat of the exhaust gas and the clean water can be performed satisfactorily.

Further, an annular cooling water passage 92 of the cooling water passage 91 for cooling water is provided on the outer periphery of the exhaust heat exchange means 12. Since the exhaust heat exchange means 12 includes the clean water passage 31, the annular cooling water passage 92 can be provided on the outer peripheral side of the clean water passage 31.
Accordingly, the clean water passage 31 can be disposed between the annular cooling water passage 92 and the exhaust gas passage 25, so that the clean water can be guided between the cooling water and the exhaust gas.
By guiding the clean water between the coolant and the exhaust gas, it is possible to prevent the heat of the clean water from being radiated by the coolant and the exhaust gas, so that the clean water can be efficiently heated.

  Further, the temperature of the exhaust gas can be lowered by exchanging heat between the exhaust gas and clean water. Thereby, a relatively low temperature exhaust gas can be discharged outside the cogeneration apparatus Co (see FIG. 1).

In addition, it is possible to separate the cooling water from the exhaust gas by guiding the clean water between the cooling water and the exhaust gas.
Therefore, heat exchange between the cooling water and the exhaust gas can be prevented.
Usually, the cooling water of the engine 11 (see FIG. 1) is suppressed to a temperature not higher than the boiling point (100 ° C.). Further, the exhaust gas is kept at a high temperature of 100 ° C. or higher.
For this reason, by not performing heat exchange between the cooling water and the exhaust gas, the temperature of the cooling water can be kept at the boiling point (100 ° C.) or less, and deterioration of the cooling water can be suppressed.

Next, an example of removing the condensed water separated from the exhaust gas when heating the clean water with the heat exchanger 10 will be described with reference to FIG.
As shown in FIG. 11, the exhaust gas is guided from the catalyst outlet 22 to the inner exhaust gas passage 26 through the lower end portion 26 b of the inner exhaust gas passage 26 as indicated by an arrow R.
On the other hand, it is guided to the inner water supply passage 33 as shown by an arrow S.
Therefore, heat exchange is performed between the exhaust gas guided to the inner exhaust gas passage 26 and the clean water guided to the inner upper water passage 33, and the temperature of the exhaust gas decreases.

When the temperature of the exhaust gas decreases, the condensed water is separated from the exhaust gas, and the separated condensed water is dropped onto the central lower inner cover 51.
Condensed water dropped on the center lower inner cover 51 is guided through the recess 52 to the upper end portion 105a of the condensed water discharging means 14 (discharge pipe 105) as indicated by an arrow T.
The guided condensed water is discharged as indicated by an arrow U to the outside of the heat exchanger 10 through the discharge pipe 105.
Thereby, when exchanging heat between the exhaust heat of exhaust gas and clean water, the condensed water generated and separated from the exhaust gas can be easily removed from the inside of the heat exchanger.

  Next, the heat exchangers of Example 2 and Example 3 will be described with reference to FIGS. In addition, in the heat exchanger of Example 2 and Example 3, the same code | symbol is attached | subjected about the same similar member as the heat exchanger 10 of Example 1, and description is abbreviate | omitted.

The heat exchanger 110 according to the second embodiment will be described.
As shown in FIG. 12, the heat exchanger 110 is configured such that the discharge pipe 112 (upper end portion 112a) of the condensed water discharge means 14 is inserted into the take-out hole 51b of the center lower inner cover 51. It is the same as that of the heat exchanger of Example 1.
By inserting the upper end portion 112a of the discharge pipe 112 into the extraction hole 51b, positioning when attaching the discharge pipe 112 can be facilitated.

A heat exchanger 120 according to the third embodiment will be described.
As shown in FIG. 13, the heat exchanger 120 is obtained by removing the cooling water passage 91 from the heat exchanger 10 of the first embodiment, and other configurations are the same as those of the heat exchanger of the first embodiment.
By removing the cooling water passage 91 from the heat exchanger 10, the configuration can be simplified, and the cogeneration apparatus Co (see FIG. 1) can be reduced in size and cost.
Even when the cooling water passage 91 is removed from the heat exchanger 10, the water can be heated by exchanging heat between the exhaust gas and the water.

It should be noted that the heat exchanger according to the present invention is not limited to the above-described embodiments, and can be changed or improved as appropriate.
For example, the heat exchangers 10, 110, 120, the engine 11, the exhaust heat exchange means 12, the cooling water heat exchange means 13, the condensed water discharge means 14, the exhaust pipe 16, the catalyst 21, the catalyst outlet 22, The shapes and configurations of the exhaust gas passage 25, the exhaust gas outlet 28, the water passage 31, the heat insulating space 36, the cooling water passage 91, and the like are not limited to those illustrated, and can be appropriately changed.

  The present invention provides a heat exchanger capable of heating clean water by exchanging heat between exhaust heat and clean water by the exhaust heat exchanging means, and exchanging heat between cool water and clean water by the coolant heat exchanging means. It is suitable for application.

DESCRIPTION OF SYMBOLS 10,110,120 ... Heat exchanger, 11 ... Engine, 12 ... Exhaust heat exchange means, 13 ... Cooling water heat exchange means, 14 ... Condensate discharge means, 16 ... Exhaust pipe, 21 ... Catalyst, 21a ... Catalyst peripheral wall (Outer periphery), 22 ... catalyst outlet (exit), 25 ... exhaust gas passage, 25a ... outer peripheral wall (outer periphery) of exhaust gas passage, 27 ... outer exhaust passage, 28 ... exhaust gas outlet, 31 ... upper water passage , 32 ... Outer water supply passage, 32c ... Outer wall of outer water supply passage (outer periphery of exhaust heat exchange means), 33 ... Inner water supply passage, 36 ... Thermal insulation space, 47 ... Inner tube, 55 ... Intermediate tube, 71 ... First Outer cylinder, 91 ... cooling water passage, 92 ... annular cooling water passage, 96 ... first outer cylinder .

Claims (2)

Exhaust gas that can be introduced into an exhaust pipe provided in the engine so that the exhaust gas can be introduced, and is capable of exchanging heat between the exhaust heat of the exhaust gas and clean water, and is provided integrally with the exhaust heat exchange means. A cooling water heat exchange means capable of exchanging heat between the cooling water and the clean water,
The exhaust heat exchange means includes
A cylindrical catalyst communicated with the exhaust pipe and capable of purifying exhaust gas led from the exhaust pipe and led out from the outlet, and exhaust gas led out from the catalyst outlet along the outer periphery of the catalyst An exhaust gas passage capable of guiding and exhausting the guided exhaust gas from an exhaust gas outlet provided on the outlet side; and an upper water passage capable of guiding the clean water along an outer peripheral side of the exhaust gas passage; And a heat insulating space provided inside the clean water passage and between the catalyst outlet and the exhaust gas outlet,
The exhaust gas passage covers the peripheral wall of the cylindrical catalyst from the outside, an annular inner exhaust gas passage provided between the cylindrical catalyst and an inner cylinder provided coaxially, and the inner cylinder Covering from the outside, comprising an annular outer exhaust gas passage provided coaxially with the inner cylinder and between the intermediate cylinder,
A plurality of inner water supply passages are provided radially in the annular outer exhaust gas passage,
The outer side of the intermediate cylinder is covered with a first outer cylinder, an annular outer upper water passage is provided between the intermediate cylinder and the first outer cylinder, and the inner upper water passage and the outer upper water passage communicate with each other.
The outside of the first outer cylinder is covered with a second outer cylinder, and an annular cooling water passage is provided between the second outer cylinder and the first outer cylinder.
It is characterized by that.   The heat exchanger according to claim 1, wherein condensate discharge means for draining the condensate separated from the exhaust gas is provided in the vicinity of the outlet of the catalyst.

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