JPH11108570A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently heat-exchange a medium to be heat-exchanged such as oxygen-containing gas for combustion with a heat source heat medium such as exhaust gas for combustion. SOLUTION: This heat exchanger is provided with a lead-in chamber 2 and a lead-out chamber 3 for a heat medium to be heat-exchanged in the direction of the flow of the heat source heat medium in a heat source heat medium passage 1. A plurality of heat exchangers 5 and 15, which make heat media to be heat-exchanged flow in the direction of the flow of the heat source heat medium flowing in the heat source heat medium passage 1, are juxtaposed in the heat source heat medium passage. For the heat exchangers 5 and 15, both their ends lead to the lead-in chamber 2 and the lead-out chamber 3, respectively, of the said heat medium to be heat-exchanged. For each heat exchange pipe 5 and 15, straight pipe parts 7 continuous to both ends connected to the lead-in chamber 2 and the lead-out chamber 3 and turn parts 8 in the middles being continuous to both straight pipes 7 and having turn bent pipe parts are arranged on the same plane orthogonal to the flow direction of the heat source heat medium flowing in the heat source heat medium passage 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel heating furnace, a heat treatment furnace, an aluminum melting furnace, and the like, for example, heat exchange between a heat source heat medium and a heat source such as preheating an oxygen-containing gas for combustion by heat exchange with combustion exhaust gas. The present invention relates to a heat exchange device that exchanges heat with a medium.

[0002]

2. Description of the Related Art A conventional heat exchanger for preheating an oxygen-containing gas for combustion in a burner of this type is disclosed, for example, in Japanese Patent Publication No. 53-20139 or Japanese Utility Model Publication No. 53-5210.
As described in Japanese Patent Application Publication No. 7, a plurality of heat exchange pipes having an intermediate portion bent in a substantially W-shape or a substantially U-shape in an exhaust gas passage of a combustion exhaust gas and a flow direction of the exhaust gas flowing through the exhaust gas passage. The heat exchange tubes are arranged in parallel, and one end of each of the heat exchange tubes is communicated with a chamber for introducing the oxygen-containing gas for combustion, and the other end is communicated with a chamber for extracting the oxygen-containing gas for combustion.

In this conventional heat exchange apparatus, the combustion oxygen-containing gas flowing from the introduction chamber is heated by heat exchange with the combustion exhaust gas flowing through the exhaust gas passage to become a high-temperature combustion oxygen-containing gas, and the outlet chamber is heated. And the hot oxygen-containing gas for combustion is supplied to the combustion section of the burner.

[0004]

In the above conventional heat exchange apparatus, the flow direction of the oxygen-containing gas for combustion is parallel to the flow direction of the combustion exhaust gas of the heat source heat source heat medium at the middle bent portion of the heat exchange tube. There was a limit to improving the recovery efficiency.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a heat exchanger capable of efficiently exchanging a heat exchange heat medium such as an oxygen-containing gas for combustion with a heat source heat medium such as combustion exhaust gas. It is.

[0006]

According to a first aspect of the present invention, there is provided a heat exchange apparatus, wherein a heat source heat medium passage and a heat exchange heat medium provided along the flow direction of the heat source heat medium in the heat medium passage. And the introduction chamber and the extraction chamber of the heat exchange heat medium which are arranged in the heat source heat medium passage in the flow direction of the heat source heat medium flowing through the heat source heat medium passage, and have both ends thereof. A plurality of heat exchange pipes for flowing the heat exchange heat medium that is communicated with the heat exchange heat medium, and each of the heat exchange pipes has both ends connected to the introduction chamber and the discharge chamber of the heat exchange heat medium. It has a straight pipe portion continuous to both ends and an intermediate folded portion continuous to both straight pipe portions, and the folded portion of each heat exchange pipe body is a folded bent pipe portion respectively continuous to both straight pipe portions. And intermediate straight pipes respectively connected to this folded pipe section And a folded bent tube portion that is continuous with both intermediate straight tube portions, and the straight tube portion and the folded portion of each of the heat exchange tubes are flow direction of the heat source heat medium flowing through the heat source heat medium passage. It is arranged on the same plane orthogonal to.

The heat-exchange heat medium introduced into the heat-exchange heat-medium introduction chamber exchanges heat with the heat-source heat medium flowing through the plurality of heat-exchange tubes and the heat-source heat-medium passages. The heat exchange heat medium is heated and flows out to the outlet chamber. The heat exchange heat medium flowing through the heat exchange tube is a straight bent portion that is continuous with both straight portions on both sides of the heat exchange tube and straight portions on both sides of the folded portion that respectively communicate with the straight portions on both sides. The intermediate straight pipe portions respectively connected to the folded bent pipe portions, and the heat source heat medium flowing in the heat source heat medium passage while flowing through the folded bent pipe portions continuous to both the intermediate straight pipe portions, are heat-exchanged, and The straight pipe sections on both sides, the folded bent pipe sections respectively connected to the both straight pipe sections, the intermediate straight pipe sections respectively connected to the folded bent pipe sections, and the folded bent pipe sections connected to the both intermediate straight pipe sections flow. The heat-exchanged heat medium and the heat-source heat medium flowing through the heat-source heat medium passage form a direct flow in the entire region, so that the heat exchange efficiency is improved and the heat efficiency is improved.

Further, each heat exchange tube body has a large number of folded portions at the folded portions, so that bending deformation due to thermal expansion hardly occurs, and heat exchange at an extremely high temperature can be performed without breakage of the heat exchange tube body.

According to a second aspect of the present invention, there is provided the heat exchange apparatus according to the first aspect, wherein the introduction chambers for the heat exchange heat medium are disposed on both sides, respectively, and at an intermediate portion between the introduction chambers on both sides. An outlet chamber for the heat exchange heat medium is formed, and one end of the heat exchange tube is connected to each of the introduction chambers for the heat exchange heat medium on both sides of the heat exchange heat medium. The ends are connected, and the pair of heat exchange tubes are arranged in the heat source heat medium passage on the same plane orthogonal to the flow direction of the heat source heat medium flowing through the heat source heat medium passage.

The heat-exchange heat mediums flowing into the heat-exchange heat-medium introduction chambers on both sides flow through the heat-exchange tubes and exchange heat with the heat-source heat medium flowing through the heat-source heat medium passages.
The heat-exchanged heat medium is heated and flows out to an outlet chamber arranged between the two introduction chambers, and is transferred to a plurality of pairs of heat exchange pipes respectively arranged on the same surface orthogonal to the flow direction of the heat source heat medium. The flowing heat exchange heat medium flows in the straight pipe portion of the heat exchange tube body and the intermediate portion continuous with the straight pipe portions on both sides, and when flowing therethrough, there is a direct exchange with the heat source heat medium, thereby increasing the heat exchange efficiency. , Improve thermal efficiency.

According to a third aspect of the present invention, there is provided the heat exchange apparatus according to the first aspect, wherein the outlet chambers for the heat exchange heat medium are disposed on both sides, respectively, and the outlet chambers on the both sides are provided at an intermediate portion. An introduction chamber for the heat exchange heat medium is formed, and one end of the heat exchange tube is connected to the intermediate heat exchange heat medium introduction chamber, and the other end of the heat exchange tube is respectively connected to the outlet chambers on both sides. And a pair of heat exchange tubes are disposed in the heat source heat medium passage on the same plane orthogonal to the flow direction of the heat source heat medium flowing through the heat source heat medium passage.

The heat exchange heat medium flowing into the introduction chamber of the heat exchange heat medium flows through the heat exchange tube, exchanges heat with the heat source heat medium flowing through the heat source heat medium passage, and generates heat exchange heat. The medium is heated and flows out to the outlet chambers disposed on both sides of the introduction chamber, and flows through the plurality of pairs of heat exchange pipes respectively disposed on the same surface orthogonal to the flow direction of the heat source heat medium. When the heat medium flows through the straight pipe portion of the heat exchange tube and the folded portion of the intermediate portion continuous with the straight pipe portions on both sides, the heat medium forms a direct flow with the heat source heat medium, thereby increasing the heat exchange efficiency and improving the heat efficiency. .

According to a fourth aspect of the present invention, there is provided the heat exchange apparatus according to the first aspect, wherein a heat exchange heat medium outlet chamber is formed on each side of the heat exchange heat medium introduction chamber.
One end of the heat exchange tube is communicated with each of the intermediate chambers for introducing the heat exchange heat medium, and the other end of the heat exchange tube is connected to each of the outlet chambers on both sides. Are arranged on the same surface orthogonal to the flow direction of the heat source heat medium flowing through the heat source heat medium passage in the heat source heat medium passage to form a first heat exchange portion, and the first heat exchange portion communicates with the outlet chambers on both sides thereof. Chambers are arranged on both sides, and an outlet for the heat exchange heat medium is formed in the middle of the introduction chamber. One end of the heat exchange pipe is connected to each of the heat exchange heat medium introduction chambers on both sides. At the same time, the other ends of the heat exchange tubes are respectively connected to the outlet chambers in the intermediate portion, and the plurality of pairs of heat exchange tubes are connected to the heat source heat medium passage so that the heat source heat medium flows through the heat source heat medium passage. The second heat exchange section is formed by arranging them on the same plane orthogonal to the direction. The first heat exchange unit is disposed downstream of the heat source heat medium flowing through the heat source heat medium passage in the heat source heat medium passage, and the second heat exchange unit flows through the heat source heat medium passage. It is disposed upstream of the heat source heat medium.

The heat exchange heat medium of the first heat exchange section that has flowed into the heat exchange heat medium introduction chamber flows through each heat exchange tube, and the heat source heat medium flowing through the heat source heat medium passage. After the heat exchange, the heat exchange heat medium is heated to a medium temperature and flows out to the outlet chambers disposed on both sides of the inlet chamber. Each heat exchange pipe flows and exchanges heat with the heat source heat medium flowing in the heat source heat medium passage on the upstream side of the position of the first heat exchange part of the heat source heat medium passage. It is heated to a high temperature and flows out to an outlet chamber arranged between the two introduction chambers, and a pair of first and second heat exchanging sections are respectively arranged on the same plane orthogonal to the flow direction of the heat source heat medium. The heat exchange heat medium flowing through the heat exchange tubes of the two tubes is the straight tube of the heat exchange tube and the straight tubes on both sides. Consecutive becomes a heat source heat medium and the cross when flowing through the folded portion of the intermediate portion, the heat exchange efficiency is increased, thereby improving the thermal efficiency.

According to a fifth aspect of the present invention, there is provided a heat exchanger according to any one of the first to fourth aspects.
The flow direction of the heat source heat medium flowing through the heat source heat medium passage is horizontal, and the heat exchange pipe body is positioned at both ends of the heat exchange pipe body at an upper side, and the heat exchange pipe body is the same in the vertical direction orthogonal to the flow direction of the heat source heat medium. It is arranged on the surface.

The heat source heat medium passage can be reduced in height, can be suspended near the ceiling of the building, does not require an installation space, and each heat exchange pipe does not hinder even if the intermediate portion is thermally expanded and deformed. There is no need for a beam or the like for supporting each heat exchange tube.

According to a sixth aspect of the present invention, there is provided a heat exchanger according to any one of the first to fourth aspects.
The flow direction of the heat source heat medium flowing through the heat source heat medium passage is set to the vertical direction, and the heat exchange tubes are arranged on the same horizontal plane orthogonal to the flow direction of the heat source heat medium.

Further, since the flow direction of the heat source heat medium flowing through the heat source heat medium passage is set to the vertical direction, the heat source heat medium can be easily installed even if the installation area is small. Since the intermediate portion is not fixed in communication with the chamber and the outlet chamber, there is no problem even if the thermal expansion deformation occurs.

According to a seventh aspect of the present invention, in the heat exchange apparatus of the sixth aspect, each of the heat exchange tubes is supported by a pipe provided in the heat source heat medium passage for flowing cooling air. It was done.

Each of the heat exchange tubes is supported by the pipe even if the intermediate portion is thermally expanded and deformed, the intermediate portion is not bent, and the pipe is cooled by the flow of cooling air, and the pipe is thermally deformed. Therefore, each heat exchange tube is securely supported.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the heat exchanger of the present invention will be described with reference to FIGS.

Reference numeral 1 denotes a heat source heat medium passage which is disposed in a horizontal direction and has a substantially rectangular longitudinal section. The heat source heat medium passage 1 is formed on the outer peripheral upper surface located downstream of the heat source heat medium passage 1. An introduction chamber 2 for the heat exchange heat medium is formed along the flowing horizontal direction, and the heat source heat medium passage 1 is formed from the introduction chamber 2.
A heat-exchange heat-medium outlet chamber 3 is formed on the outer peripheral upper surface located upstream of the heat-source heat medium flowing through the heat-exchange medium.

Further, the heat source heat medium passage 1 is located on both sides of the inlet and outlet chambers 2 and 3 for the heat exchange heat medium in the horizontal direction in which the heat source heat medium flows. Outlet entry chambers 4 and 4 are formed in parallel along the downstream side as the outlet chamber and the upstream side as the inlet chamber.

A pair of downstream heat exchange pipes 5 and 5 having one end communicating with the introduction chamber 2 and the other end communicating with the outlet chambers 4 and 4 serving as outlet chambers, respectively, are connected to the heat source heat medium passage 1. The heat exchange pipes 5, which are vertically suspended on the same plane in the vertical direction orthogonal to the flowing direction of the flowing heat source heat medium,
A plurality of pairs 5 are arranged side by side in the flow direction of the heat source heat medium in the heat source heat medium passage 1 to form a first heat exchange part 6.

Each of the heat exchange tubes 5, 5 of the first heat exchange section 6
Reference numeral 5 denotes both ends connected to the inlet and outlet chambers 4 and 4 serving as the inlet and outlet chambers 2 and 4 for the heat exchange heat medium, and both straight pipes 7 continuous with the both ends and continuous straight pipes 7 on both sides. And a folded portion 8 which is continuous with the straight tube portions 7 on both sides, and an intermediate straight tube portion 10 which is respectively continuous with the folded tube portion 9. , 10 and a folded tube portion 11 which is continuous with the intermediate straight tube portions 10, 10, and is formed in a substantially W shape.
The pair of heat exchange pipes 5 and 5 are disposed so as to hang down on the same plane in the vertical direction orthogonal to the flow direction of the heat source heat medium flowing in the heat source heat medium passage 1.

A pair of upstream heat exchange tubes 15, 15 having one end communicating with the outlet chambers 4, 4 serving as the introduction chambers and the other end communicating with the outlet chamber 3 serving as the outlet chamber, are connected to the heat source heat source. The heat source heat medium flowing through the medium passage 1 is disposed so as to hang down on the same plane in the vertical direction orthogonal to the flow direction of the heat source heat medium, and the pair of heat exchange tubes 15 A plurality of pairs are arranged in parallel in the flow direction of the medium to form a second heat exchange section 16.

Each of the heat exchange tubes 15 of the second heat exchange section 16
15 is a lead-in / out chamber 4, 4 serving as an introduction chamber for the heat exchange heat medium.
Each of the two ends is connected to the outlet chamber 3 and has a straight pipe portion 17 continuing to the both ends and a middle folded portion 18 continuing to the straight pipe portions 17 on both sides.
Folded bent sections that are respectively continuous with the straight pipe sections 17 on both sides
19, an intermediate straight pipe portion 20 and 20 continuous with the folded bent pipe portion 19, and a folded bent pipe portion 21 continuous with the intermediate straight pipe portions 20 and 20 are formed in a substantially W shape. The pair of heat exchange tubes 15, 15 are disposed so as to hang down on the same plane orthogonal to the flow direction of the heat source heat medium flowing through the heat source heat medium passage 1.

The first heat medium passage 1 is located downstream of the heat medium flowing through the heat medium passage 1.
The heat exchange section 6 is disposed on the downstream side of the heat source heat medium flowing through the heat source heat medium passage 1 with respect to the second heat exchange section 16, and the second heat exchange section 16 performs the first heat exchange. It is arranged on the upstream side at a higher temperature than the part 6.

The downstream heat exchange tube 5 and the upstream heat exchange tube 15 are formed of a heat-resistant metal material such as Inconel or 70% nickel / 15% chromium alloy.

Next, the operation of this embodiment will be described.

As shown in FIG. 2, the heat exchange heat medium introduced into the introduction chamber 2 located on the downstream side of the heat source heat medium flowing through the heat source heat medium passage 1 has one end communicating with the introduction chamber 2. The heat exchange heat that has been exchanged with the heat source heat medium flowing into the plurality of pairs of downstream heat exchange tubes 5 of the first heat exchange unit 6 and flowing through the heat source heat medium passage 1 to be heated to an intermediate temperature. The medium flows out to the lead-in / out chambers 4 and 4 serving as the medium.

The heat exchange heat medium flowing in each of the plurality of pairs of heat exchange tubes 5, 5 disposed on the same plane orthogonal to the flow direction of the heat source heat medium is directly in the heat exchange tubes 5, 5. The pipes 7, 7, the folded bent pipes 9 that are respectively continuous with the straight pipes 7 on both sides of the intermediate folded part 8 that is continuous with the straight pipes 7 on both sides, and continuous with the folded bent pipe 9, respectively. Intermediate straight pipe sections 10, 10 and the two intermediate straight pipe sections 10,
When flowing through the bent tube portion 11 that is continuous with 10,
The heat exchange heat medium of the heat exchange tubes 5, 5 is exchanged with the heat source heat medium in a cross flow.

Further, as shown in FIG. 3, the heat-exchanged heat medium flowing out to the lead-in / out chambers 4 and 4 serving as the lead-out chambers is supplied to a plurality of second heat-exchange sections 16 having one ends communicating with the lead-in / out chambers 4 and 4. It flows to the heat exchange pipes 15 and 15 on the upstream side of the pair, and the heat source heat medium passage 1
The heat is exchanged with the heat source heat medium flowing through the heat source, and flows into the outlet chamber 3 as a heat exchange heat medium heated to a high temperature.

Then, each downstream heat exchange pipe 5 of the first heat exchange section 6 and each upstream heat exchange pipe 15 of the second heat exchange pipe 16
The heat exchange heat medium flowing through the heat source heat medium flowing through the heat source heat medium passage 1 has a cross flow with the heat exchange heat medium flowing through the heat exchange heat medium. The laminar flow along the upstream side of the heat source heat medium becomes turbulent on the downstream side, and when the flow velocity of the heat source heat medium exceeds a certain speed, the turbulent flow also occurs on the upstream side, and The heat exchange rate is increased.

When the heat exchange device is applied to a burner device, the heat source heat medium is combustion exhaust gas generated from a combustion portion in a kiln of the combustion device, and the heat exchange heat medium is a preheated combustion medium for combustion. It becomes an oxygen-containing gas, for example, air.

The upstream side of the heat source heat medium passage 1 is communicated with a combustion part in the kiln of the combustion device, for example, a burner, and the outlet chamber 3 for the heat exchange heat medium is connected to the combustion part in the kiln of the combustion device. Communicated.

Further, one or both of the heat source heat medium and the heat exchange heat medium can be liquid.

Furthermore, in the above embodiment, the heat exchange heat medium flows through the first heat exchange section 6 and the second heat exchange pipe section 16 and is heated in two stages. Heat exchange device. In this one-stage heat exchange device, the first heat exchange section 6 is configured to flow from one heat exchange heat medium introduction chamber 2 to two heat exchange heat medium outlet chambers, or It is also possible to adopt a configuration in which the two heat exchange heat transfer medium introduction chambers 2 of the heat exchange section 16 are allowed to flow out into one heat exchange heat transfer medium discharge chamber.

Further, in the above-described embodiment, a pair of heat exchange tubes 5, 5 or a pair of heat exchange tubes are provided on the same surface in the vertical direction orthogonal to the flow direction of the heat source heat medium flowing through the heat source heat medium passage 1. Although the pipes 15 and 15 are provided, one heat exchange pipe 5 or one heat exchange pipe is provided on the same vertical surface orthogonal to the flow direction of the heat source heat medium flowing through the heat source heat medium passage 1.
It is also possible to adopt a structure in which 15 are provided.

In the case where the heat exchange device of the above embodiment is applied to a burner device, the combustion exhaust gas has a temperature of about 1400 ° C.
About 1000 to 1100 ° C. in the second heat exchange section 16, and the temperature of the heat exchange heat medium, for example, the air of the oxygen-containing gas for combustion when flowing through the first heat exchange section 6 is about 600 to 800 ° C. ° C, and the temperature of the air of the oxygen-containing gas for combustion of the heat exchange heat medium supplied to the combustion part of the kiln becomes about 1000 to 1100 ° C.

In each of the above embodiments, an example has been described in which the heat exchange heat medium exchanges heat from a low temperature to a high temperature. However, heat exchange may be performed from a high temperature to a low temperature.

Next, another embodiment of the present invention will be described with reference to FIGS.

Reference numeral 30 denotes a heat source heat medium passage which is disposed in the vertical direction and has a substantially rectangular cross section, and is covered with a heat insulating material 31. An introduction chamber 32 for the heat exchange heat medium is formed on the outer peripheral front face located downstream of the heat source heat medium path 30 along the longitudinal direction in which the heat source heat medium flows through the heat source heat medium path 30.
An outlet chamber 33 for the heat exchange heat medium is formed on the outer peripheral front surface located on the upstream side of the heat source heat medium flowing through the heat source heat medium passage 30.

Further, the heat source heat medium passage 30 is positioned on both sides of the heat exchange heat medium introduction chamber 32 and the discharge chamber 33 on the outer peripheral front surface of the heat source heat medium passage 30 in the horizontal direction in which the heat source heat medium flows. Outlet entry chambers 34, 34 are formed in parallel along the downstream side as outlet chambers and the upstream side as inlet chambers.

A pair of downstream heat exchange pipes 35, 35, one end of which communicates with the introduction chamber 32 and the other end of which serves as an outlet chamber, communicates with the heat source heat medium passage 30. A plurality of pairs of heat exchange pipes 35, 35 are provided on the same horizontal plane orthogonal to the flowing direction of the flowing heat source heat medium, Are arranged side by side to form a first heat exchange section 36.

Each of the heat exchange tubes 35 of the first heat exchange section 36,
35 has both ends connected to the inlet and outlet chambers 34 and 34 serving as the inlet and outlet chambers 32 and 34 for the heat exchange heat medium, and both straight pipes 37 continuous with both ends and continuous straight pipes 37 on both sides. A folded portion 38 which is continuous with the straight pipe portions 37 on both sides, and an intermediate straight tube portion 40 which is respectively connected to the folded bent portion 39. , 40 and a folded tube portion 41 which is continuous with the intermediate straight tube portions 40, 40, and is formed in a substantially W shape.
The pair of heat exchange tubes 35 are disposed on the same plane in the horizontal direction orthogonal to the flow direction of the heat source heat medium flowing through the heat source heat medium passage 30.

Further, a pair of upstream heat exchange tubes 45, 45 having one ends communicating with the lead-in / out chambers 34, 34 serving as the introduction chambers and the other end communicating with the lead-out chambers 33 serving as the lead-out chambers, serve as the heat source heat source. The heat exchange pipes 45 are arranged on the same plane in the horizontal direction orthogonal to the flow direction of the heat source heat medium flowing through the medium passage 30, and each pair of heat exchange pipes 45, 45 A plurality of pairs are arranged side by side in the direction to form a second heat exchange section 46.

Each heat exchange pipe 45 of the second heat exchange section 46,
45 is a lead-in / out chamber 34, 34 serving as an introduction chamber for the heat exchange heat medium.
And a straight pipe part 47 connected to both ends of the outlet chamber 33 and a middle folded part 48 continuous with the straight pipe parts 47 on both sides, and the folded part 48 is
Folded bent pipe sections that are respectively continuous with the straight pipe sections 47 on both sides
49, an intermediate straight pipe part 50, 50 continuous with the folded bent pipe part 49, and a folded bent pipe part 51 continuous with the intermediate straight pipe parts 50, 50 are formed in a substantially W shape. The pair of heat exchange tubes 45 are arranged on the same plane in the horizontal direction orthogonal to the flow direction of the heat source heat medium flowing through the heat source heat medium passage 30.

The heat source heat medium passage 30 is provided downstream of the heat source heat medium flowing through the heat source heat medium passage 30.
The heat exchange section 36 is disposed on the downstream side of the heat source heat medium flowing through the heat source heat medium passage 30 with respect to the second heat exchange section 46, and the second heat exchange section 46 performs the first heat exchange. It is arranged on the upstream side where the temperature is higher than the part 36.

An intermediate portion of each of the heat exchange tubes 35, 35, 45, 45 is located at a position before and after the heat source heat medium passage 30, corresponding to each of the heat exchange tubes 35, 35, 45, 45. The heat sources are supported by pipes 52 arranged sequentially in the flow direction of the heat medium. Both ends of each pipe 52 are connected to the heat source heat medium passage.
The cooling air inflow chamber 53 and the cooling air outflow chamber 54 formed on both sides of 30 are connected to each other.

The downstream heat exchange tube 35 and the upstream heat exchange tube 45 are also formed of a heat-resistant metal material such as Inconel or 70% nickel / 15% chromium alloy.

Next, the operation of this embodiment will be described.

As shown in FIG. 6, the heat-exchange heat medium introduced into the introduction chamber 32 located downstream of the heat-source heat medium flowing through the heat-source heat medium passage 30, as indicated by solid arrows, respectively. The heat exchange with the heat source heat medium flowing into the heat source heat medium passages 30 flowing into the heat source heat medium passages 30 by flowing into the plural pairs of downstream heat exchange pipes 35 of the first heat exchange part 36 having one ends communicating with the introduction chambers 32, respectively. The heated heat-exchanged heat medium flows out to the lead-in / out chambers 34, 34 serving as the outlet chambers.

The heat exchange heat medium flowing through the plurality of pairs of heat exchange tubes 35, 35 respectively disposed on the same plane orthogonal to the flow direction of the heat source heat medium is directly transferred to the heat exchange tubes 35, 35. The pipes 37, 37, the folded bent pipes 39 that are continuous with the straight pipes 37 on both sides of the intermediate folded part 38 that is continuous with the straight pipes 37, 37 on both sides, and the bent bent pipe 39 that is continuous with the folded bent pipe 39, respectively. Intermediate straight pipe sections 40, 40, and both intermediate straight pipe sections 40, 40
When flowing with the folded tube portion 41 continuous with 40,
The heat exchange heat medium of the heat exchange tubes 35 is exchanged with the heat source heat medium in a cross flow.

Further, as shown by a chain line arrow in FIG. 6, the heat-exchanged heat medium flowing out to the lead-in / out chambers 34, 34 serving as the lead-out chambers is supplied to the second heat-exchange section having one end communicating with the lead-in / out chambers 34, 34. 46
Flows into a plurality of pairs of heat exchange tubes 45, 45 on the upstream side, and exchanges heat with the heat source heat medium flowing through the heat source heat medium passage 30 to become a heat exchange heat medium heated to a high temperature to the outlet chamber. Spilled to 33.

Then, each downstream heat exchange pipe 35 of the first heat exchange section 36 and each upstream heat exchange pipe 45 of the second heat exchange pipe 46
The heat exchange heat medium flowing through the heat source heat medium flowing through the heat source heat medium passage 30 has a cross flow with the heat exchange heat medium, and when the heat source heat medium contacts the heat exchange tubes 35 and 45, the heat exchange tubes 35 and 45 The laminar flow along the upstream side of the heat source heat medium becomes turbulent on the downstream side, and when the flow velocity of the heat source heat medium exceeds a certain speed, it becomes turbulent on the upstream side as well, and The heat exchange rate is increased.

When the heat exchange device is applied to a burner device, the heat source heat medium is the combustion exhaust gas generated from the combustion portion in the kiln of the combustion device, and the heat exchange heat medium is a preheated combustion heat medium. It becomes an oxygen-containing gas, for example, air.

The upstream side of the heat source heat medium passage 30 is communicated with a combustion section in the kiln of the combustion apparatus, for example, a burner, and the outlet chamber 33 for the heat exchange heat medium is connected to the combustion section in the kiln of the combustion apparatus. Communicated.

Further, the cooling air flowing from the cooling air inflow chamber 53 flows into the pipe 52 supporting the heat exchange pipes 35 and 45, respectively, and flows out to the cooling air outflow chamber 54. 52 reliably supports the heat exchange tubes 35 and 45 without thermal deformation.

Further, one or both of the heat source heat medium and the heat exchange heat medium may be liquid.

Further, in the above embodiment, the heat exchange heat medium flows through the first heat exchange section 36 and the second heat exchange pipe section 46 and is heated in two stages. Heat exchange device. In this one-stage heat exchange apparatus, one of the first heat exchange units 36 has an introduction chamber for the heat exchange heat medium.
It is configured to flow out of the two heat exchange heat mediums to the outlet chambers of the two heat exchange heat mediums from the second heat exchange heat medium introduction chamber 32 of the second heat exchange unit 46. It is also possible to adopt a configuration in which the fluid is discharged to

When the heat exchange device of this embodiment is applied to a burner device, the combustion exhaust gas is about 1400 ° C., and the second heat exchange section 46 is about 1000 to 1100 ° C.
When flowing through the heat exchange section 36, the temperature of the heat exchange heat medium
The temperature of the oxygen-containing gas for combustion and combustion of the heat exchange heat medium supplied to the combustion part of the kiln is about 600 to 800 ° C.
It will be around 1000-1100 ° C.

In each of the above embodiments, an example has been described in which the heat exchange heat medium exchanges heat from a low temperature to a high temperature. However, heat exchange may be performed from a high temperature to a low temperature.

[0064]

According to the first aspect of the present invention, the heat-exchange heat medium introduced into the heat-exchange heat-medium introduction chamber flows through the plurality of heat exchange pipes and passes through the heat-source heat medium passage. The heat exchange heat medium exchanges heat with the flowing heat source heat medium, the heat exchange heat medium is heated and flows out to the outlet chamber, and the heat exchange heat medium flowing through the heat exchange tube passes through the heat source heat medium passage in the entire area of the heat exchange tube. The flowing heat source heat medium becomes a direct flow, the heat exchange efficiency is increased, and the heat efficiency is improved. Further, each heat exchange tube has a large number of folded portions in the folded portion, so that the heat exchange tube is less likely to be deformed by thermal expansion, and the heat exchange tube is not broken, which is advantageous for heat exchange at an ultra-high temperature.

According to the second aspect of the present invention, the heat exchange heat medium flowing through the plurality of pairs of heat exchange pipes respectively arranged on the same surface orthogonal to the flow direction of the heat source heat medium is a heat exchange pipe. When flowing through the straight pipe portion and the intermediate portion that is continuous with the straight pipe portions on both sides, the flow becomes a direct flow with the heat source heat medium, the heat exchange efficiency is increased, and the heat efficiency is improved.

According to the third aspect of the present invention, the heat exchange heat medium flowing through the plurality of pairs of heat exchange pipes respectively arranged on the same surface orthogonal to the flow direction of the heat source heat medium is a heat exchange pipe. When flowing through the straight pipe portion and the intermediate portion that is continuous with the straight pipe portions on both sides, the flow becomes a direct flow with the heat source heat medium, the heat exchange efficiency is increased, and the heat efficiency is improved.

According to the fourth aspect of the present invention, the heat exchange heat medium of the first heat exchange section which has flowed into the introduction chamber of the heat exchange heat medium flows through each heat exchange tube, and the heat source heat medium The heat exchange medium exchanges heat with the heat source heat medium flowing through the passage, and the heat exchange heat medium is heated to a medium temperature and flows out to the outlet chambers arranged on both sides of the inlet chamber, and further, the inlet chambers communicating with the outlet chambers, respectively. Flows through the respective heat exchange tubes of the second heat exchange unit, and exchanges heat with the heat source heat medium flowing through the heat source heat medium passage at a position upstream of the position of the first heat exchange unit in the heat source heat medium passage. The heat exchange heat medium is further heated to a high temperature and flows out to the outlet chamber disposed between the two introduction chambers, and is orthogonal to the flow direction of the heat source heat medium in the first and second heat exchange units. The heat exchange heat medium flowing in each of a plurality of pairs of heat exchange tubes arranged on the same surface is a heat exchange tube. Becomes a heat source heat medium and the cross when flowing through the folded portion of the intermediate portion which is continuous with the tube portion to the both side straight pipe portion, the heat exchange efficiency is increased, thereby improving the thermal efficiency.

According to the fifth aspect of the present invention, since the flow direction of the heat source heat medium flowing through the heat source heat medium passage is set to the vertical direction, the height of the heat source heat medium passage can be reduced, and the heat source heat medium passage can be suspended near the ceiling of the building. It can be placed down, does not require the installation space of the heat exchange device, does not hinder each heat exchange tube even if the middle part is thermally expanded and deformed, and does not need a beam for supporting each heat exchange tube.

According to the sixth aspect of the present invention, since the flow direction of the heat source heat medium flowing through the heat source heat medium passage is set to the vertical direction, the heat source heat medium can be easily installed even if the installation area is small. Since both ends communicate with the introduction chamber and the extraction chamber on the same side and the intermediate part is not fixed, there is no problem even if the thermal expansion deformation occurs.

According to the seventh aspect of the present invention, each heat exchange tube is supported by the pipe even if the intermediate portion is thermally expanded and deformed, the intermediate portion does not bend, and the pipe is formed by the flow of cooling air. Thus, the pipes are not thermally deformed, and each heat exchange tube is securely supported.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a heat exchange device according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the first heat exchange unit.

FIG. 3 is a longitudinal sectional view of a second heat exchange unit according to the first embodiment.

FIG. 4 is a cross-sectional plan view of a heat exchange device showing another embodiment of the present invention.

FIG. 5 is a front view of the heat exchange device.

FIG. 6 is a vertical sectional front view of the same heat exchanger.

[Explanation of symbols]

 1,30 Heat source heat medium passage 2,32 Inlet chamber 3,33 Outlet chamber 4,34 Outlet inlet and outlet chamber 5,15,35,45 Heat exchange tube 6,36 First heat exchange part 7 , 17,37,47 Straight pipe section 8,18,38,48 Folded section 9,19,39,49 Folded bent pipe section 10,20,40,50 Intermediate straight pipe section 11,21,41,51 Folded bent pipe Part 16, 46 Second heat exchange part 52 Pipe

Claims (7)

[Claims] 1. A heat source heat medium passage, an introduction chamber and a discharge chamber of a heat exchange heat medium provided along the flow direction of the heat source heat medium in the heat medium passage, and the heat source in the heat source heat medium passage. A plurality of heat exchange pipes which are arranged in parallel in the flow direction of the heat source heat medium flowing through the heat medium passage, and whose both ends flow through the heat exchange heat medium communicated with the introduction chamber and the discharge chamber of the heat exchange heat medium. And each of the heat exchange pipes has both ends connected to the introduction chamber and the discharge chamber of the heat exchange heat medium, and is connected to the straight pipes continuous with the both ends and the straight pipes on both sides. The intermediate portion has a folded portion, and the folded portion of each heat exchange tube body is a folded bent tube portion continuous to both straight tube portions, and an intermediate straight tube portion respectively continuous to the folded bent tube portion, A folded bent tube section that is continuous with both intermediate straight pipe sections Wherein the straight pipe portion and the folded portion of each of the heat exchange pipes are arranged on the same plane orthogonal to the flow direction of the heat source heat medium flowing through the heat source heat medium passage. . 2. An introduction chamber for a heat exchange heat medium is disposed on each side, and a discharge chamber for a heat exchange heat medium is formed at an intermediate portion between the introduction chambers on both sides. The other end of the heat exchange tube is connected to the intermediate chamber and the other end of the heat exchange tube is connected to the introduction chamber of the intermediate portion. The heat exchange device according to claim 1, wherein the heat source heat medium flowing in the heat source heat medium passage is disposed on the same surface orthogonal to the flow direction of the heat source heat medium. 3. An outlet chamber for a heat-exchange heat medium is disposed on each side, and an inlet chamber for the heat-exchange heat medium is formed at an intermediate portion between the outlet chambers on both sides. One end of the heat exchange tube is communicated with each of the introduction chambers, and the other end of the heat exchange tube is connected to each of the outlet chambers on both sides, and the pair of heat exchange tubes are connected to the heat source heat medium passage with the heat source. The heat exchange device according to claim 1, wherein the heat source heat medium flowing in the heat medium passage is disposed on the same surface orthogonal to the flow direction of the heat source heat medium. 4. An outlet chamber for a heat-exchange heat medium is formed on each side of the heat-exchange heat-medium introduction chamber, and one end of each heat-exchange tube is inserted into the intermediate heat-exchange heat-medium introduction chamber. The other ends of the heat exchange tubes are connected to the outlet chambers on both sides, respectively, and the pair of heat exchange tubes are connected to the heat source heat medium passage in the flow direction of the heat source heat medium flowing through the heat source heat medium passage. A first heat exchange portion is formed by arranging the first heat exchange portions on the same surface orthogonal to each other. Introducing chambers communicating with the outlet chambers on both sides are respectively disposed on both sides, and a heat exchange heat medium is provided in an intermediate portion of the introducing chambers. Are connected to one end of each heat exchange tube with the introduction chamber of the heat exchange heat medium on both sides, and the other end of each heat exchange tube is connected to the intermediate chamber. And passing the plurality of pairs of heat exchange tubes through the heat source heat medium passage. Are disposed on the same plane orthogonal to the flow direction of the heat source heat medium flowing therethrough to form a second heat exchange portion, and the heat source heat medium passage is downstream of the heat source heat medium flowing through the heat source heat medium passage. 2. The heat according to claim 1, wherein the first heat exchanging section is disposed on the upstream side of the heat source heat medium flowing through the heat source heat medium passage. Exchange equipment. 5. The flow direction of the heat source heat medium flowing in the heat source heat medium passage is horizontal, and the heat exchange tube body is oriented orthogonally to the flow direction of the heat source heat medium with both ends of the heat exchange tube body facing upward. The heat exchange device according to any one of claims 1 to 4, wherein the heat exchange device is arranged on the same vertical surface. 6. A heat source heat medium flowing in a heat source heat medium passage, wherein the flow direction of the heat source heat medium is vertical, and the heat exchange tube is disposed on the same horizontal plane orthogonal to the flow direction of the heat source heat medium. The heat exchange device according to any one of claims 1 to 4, wherein: 7. The heat exchange apparatus according to claim 6, wherein each heat exchange pipe is supported by a pipe provided in the heat source heat medium passage for flowing cooling air.