JP2001355994A - Stacked type heat exchanger for cooling gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stacked type heat exchanger enabling smooth discharge of the drain of gas to be cooled, in regard to the stacked type heat exchanger wherein the gas flows through a return path. SOLUTION: A drain hole 9 is provided in one end part of a reversing plate 10 constituting a partition plate, while a gas inlet-outlet 8 is opened in the other end part thereof. The area of the opening of the drain hole 9 is made smaller considerably than that of the gas inlet-outlet 8. Moreover, the whole stacked type heat exchanger is inclined so that the gas inlet-outlet 8 of the reversing plate 10 is positioned above the horizontal plane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-cooling heat exchanger for cooling high-temperature exhaust gas or the like having a highly corrosive substance, in which a number of plate-like plates are stacked.

[0002]

2. Description of the Related Art If highly acidic substances such as H ₂ O and sulfur oxides are present in the components, such as exhaust gas from fossil fuel combustion, acidic condensed water is generated by cooling. If the condensed water stays on the plate for a long time, it causes corrosion of the plate. Therefore, a means for inclining the entire heat exchanger and smoothly discharging condensed water below the gas inlet / outlet can be considered. That is, as shown in FIG. 6, the other side of the heat exchanger is inclined upward by an angle α with respect to the one side, and the gas 4 flowing from one gas inlet / outlet of the heat exchanger flows through each element in parallel. From the gas inlet / outlet. Gas passages and cooling water passages (not shown) are alternately arranged between the plates of each element, and the gas 4 such as exhaust gas is cooled by the cooling water to generate a drain 12, which is formed on the inclined surface of each element. It flows down and is discharged from the gas inlet / outlet.

[0003]

As shown in FIG. 6, when the gas 4 flows through each element in one pass from one gas port to the other gas port in the stacked heat exchanger. The drain 12 can be easily discharged by inclining the entire heat exchanger by the angle α. However, in such a one-pass type heat exchanger, the flow path of the gas 4 becomes short, and sufficient cooling of the gas may not be ensured in some cases. In that case, it is necessary to lengthen each element. However, since the engine room of an automobile is small, the lengthwise dimension of each element of the heat exchanger for cooling exhaust gas is often greatly restricted.
Therefore, a return-pass type heat exchanger in which a partition plate is provided at an appropriate height of the heat exchanger and the gas 4 flows in a meandering shape can be considered. In that case, no matter which direction the heat exchanger is inclined, the condensed water stays on the partition plate and it becomes difficult to discharge it.
Then, the heat exchanger may be corroded by corrosive condensed water. At the same time, the heat exchange performance is reduced due to the retention of the condensed water. Therefore, an object of the present invention is to solve such a problem.

[0004]

The present invention according to claim 1 comprises a pair of plates 1 and 2 whose outer peripheral edges are hermetically joined to each other and at least one of which is formed in an elongated dish shape. , Forming a flat gas flow path 3 inside,
In a gas-cooling laminated heat exchanger comprising an element 7 having gas ports 5 and 6 opened at one end and the other end, and a plurality of the elements 7 being laminated at their both ends in communication with each other. A reversing plate 10 having a gas inlet / outlet 8 at the other end and a drain hole 9 having an opening area significantly smaller than the opening area of the gas inlet / outlet 8 at the one end.
Is disposed in the middle part of the heat exchanger in the stacking direction, and the plane of each element 7 is disposed so as to be inclined such that the one end is lower than the other end with respect to the horizontal plane.
Flows through the upstream element 7 from the gas port 5 at one end to the gas port 6 at the other end, flows through the gas port 8 of the reversing plate 10, and passes through the inside of the downstream element at the gas port at the other end. 6 is formed so as to flow from the gas inlet / outlet 5 at one end, and the drain 12 condensed in the gas flow path 3 of the upper element in the stacking direction is formed by the gas inlet / outlet 5 on one side.
From the gas inlet / outlet port 5 of the lower element through the drain hole 9 of the reversing plate 10. It is a vessel.

According to a second aspect of the present invention, there is provided a gas cooling apparatus according to the first aspect, wherein the gas passages 3 and the cooling water passages 13 are alternately arranged in the stacking direction of the plates except for the reversing plate 10. It is a laminated type heat exchanger. According to a third aspect of the present invention, there is provided a gas cooling system according to the first or second aspect, wherein one of a pair of plates of the element located at an intermediate portion in the stacking direction of the heat exchanger also serves as the reversing plate 10. It is a stacked heat exchanger. The present invention described in claim 4 is based on claim 1.
4. The gas-cooling laminated heat exchanger according to claim 3, wherein a hole edge of the drain hole 9 protrudes downward in a funnel shape. 5.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic exploded perspective view of the laminated heat exchanger of the present invention. FIG. 2 shows an assembled state of the heat exchanger, and is a schematic sectional view taken along the line II-II in FIG. FIG. 3 is an overall perspective schematic view of the heat exchanger,
FIG. 4 is an explanatory view showing the flow state of the gas 4 and the drain 12. In this example, as shown in FIGS.
A plurality of elements 7 are arranged above and below, respectively. Each element 7 includes a pair of upper and lower first and second plates 1,
2 and inner fins 15. Each of the plates 1 and 2 is formed in a rectangular elongated dish shape, and gas inlets and outlets 5 and 6 are disposed on one diagonal of both ends in the longitudinal direction, and cooling water inlets and outlets 17 and 18 are provided on both ends on the other diagonal. Has been drilled. The first plate 1 is raised such that the peripheral edge and the hole edge of the cooling water inlet / outlet 18 are bulged upward to form a groove-like portion therein. The flat portion that is depressed relative to the peripheral edge forms the gas flow path 3, and the inner fin 15 is disposed therein. Second plates 2 are respectively disposed on the upper and lower surfaces of the first plate 1, and the respective gas ports 5 and 6 communicate with each other.

The second plate 2 has its peripheral edge slightly raised upward, and the hole edges of the gas ports 5, 6 also slightly raised. Furthermore, a large number of small convex portions 16 for spacers are dispersed and bulged upward in the middle of the portions. A reversing plate 10 is interposed between the elements. The reversing plate 10 has a first end at the other end in the longitudinal direction.
A gas port 8 matching the gas port 6 of the plate 1 and the second plate 2 is formed, and a drain hole 9 is formed at one end. The drain hole 9 is significantly smaller than the opening area of the gas port 8 and is formed in a slit shape. Further, the edge of the drain hole 9 is shown in FIG.
As shown in (b), it has a funnel shape 22 which is narrowed down. The drain hole 9 and the gas inlet / outlet 8 are disposed at both ends on one diagonal of the reversing plate 10, and cooling water inlets 17 and 18 are provided at both ends on the other diagonal of the reversing plate 10, It is aligned with the cooling water ports 17 and 18 of the plates 1 and 2. Further, a pair of end plates 19 are arranged at both upper and lower ends in the stacking direction. A boss 23 (FIG. 3) for connecting a gas pipe is disposed at the edge of the hole of the gas port 5 of the end plate 19, and a cooling water pipe 24 is disposed at the cooling water port 17.

[0008] Each of such plates is made of a stainless steel plate, and a nickel brazing material having corrosion resistance is interposed between the components. As one example, a nickel-based amorphous brazing material can be used. As shown in FIG. 2, in this example, a plurality of elements 7 are arranged above and below the reversing plate 10, and the cooling water passages 13 and the gas passages 3 are alternately arranged in each element 7. Note that an inner fin 15 is arranged in the gas flow path 3. The heat exchanger thus configured is arranged at an angle α as shown in the explanatory view of FIG. 4, and the gas 4 flows from the left end to the right end in the element below the reversal plate 10 and the reverse. In the element above the plate 10, it flows from the right end to the left end, and flows out from the boss 23 at the upper end. Since the opening area of the drain hole 9 of the reversing plate 10 is extremely small and the edge of the hole projects downward, the gas 4 hardly bypasses the drain hole 9 upward. Then, the gas 4 is cooled by the cooling water flowing through each element, and the drain 12
Is generated, which flows down the inclined surface of each element and is discharged from the boss 23 at the lower end. The drain 12 generated by the elements above the reversing plate 10 falls from the gas inlet / outlet of each element to the reversing plate 10 and is discharged outside from the boss 23 at the lower end through the drain hole 9 of the reversing plate 10.

Next, FIG. 5 shows an example in which the gas 4 moves in a meandering manner in three passes. Also in this example, the drain hole 9 is formed at the downstream end of the reversing plate 10 in the inclined direction. Then, the drain 12 of each element above the reversing plate 10 is entirely discharged downward through the drain hole 9.

[0010]

In the laminated heat exchanger for gas cooling according to the present invention, the gas 4 flows from the gas inlet / outlet 5 at one end to the gas inlet / outlet 6 at the other end of the element on the downstream side of the reversal plate 10. The upstream element 7 has a return path structure in which the gas 4 flows from the gas inlet / outlet 6 at the other end to the gas inlet / outlet 5 at one end, and condensed water generated on the gas passage 3 of each element 7 Is passed through the gas inlet / outlet 5 at one end of each element, flows through the drain hole 9 of the reversing plate 10, and is smoothly removed downward. In addition, since the drain hole 9 of the reversing plate 10 is formed to be significantly smaller than the opening area of the gas inlet 8, it is possible to prevent the gas 4 from being bypassed through the drain hole 9. And, by the complete discharge of the drain 12, a highly durable heat exchanger can be provided. That is, even if the drain 12 contains a corrosive substance, the durability is improved by smoothly removing the drain 12, and the heat exchange performance is improved by discharging the drain. Further, by projecting the edge of the drain hole 9 downward in a funnel shape, the drain can be easily discharged, and the bypass of the gas to be cooled can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a schematic exploded perspective view of a laminated heat exchanger for gas cooling of the present invention.

FIG. 2 shows an assembled state of the heat exchanger, and is II-II in FIG.
FIG. 3 is a cross-sectional view taken along a line.

FIG. 3 is an explanatory schematic diagram of the heat exchanger.

FIG. 4 is an explanatory diagram showing the operation of the heat exchanger.

FIG. 5 is an operation explanatory view in another embodiment of the present invention.

FIG. 6 is an explanatory view of drain discharge of a conventional heat exchanger.

[Explanation of symbols]

 1, 2 plate 3 gas flow path 4 gas 5, 6 gas inlet / outlet 7 element 8 gas inlet / outlet 9 drain hole 10 reversing plate 12 drain 13 cooling water flow path 14 cooling water 15 inner fin 16 small convex portion 17, 18 cooling water inlet / outlet 19 end Plate 22 Funnel 23 Boss 24 Cooling water pipe

Claims (4)

[Claims] An outer peripheral edge is airtightly joined to each other, and at least one of the outer peripheral edges is formed of a pair of plates 1 and 2 formed in an elongated dish shape. A gas-cooling laminated heat exchanger having an element 7 having gas ports 5 and 6 opened at one end and the other end, and a plurality of the elements 7 being laminated by communicating with each other at both ends. A reversing plate 10 having a gas inlet / outlet 8 at the other end thereof and a drain hole 9 having an opening area significantly smaller than the opening area of the gas inlet / outlet 8 at one end thereof is provided at an intermediate portion in the stacking direction of the heat exchanger. The plane of each element 7 is arranged so as to be inclined such that the one end is lower than the other end with respect to the horizontal plane, and the gas 4 to be cooled passes through the upstream element 7 through the one end. From the gas inlet / outlet 5 of the section It is formed so as to flow through the gas inlet / outlet 6 at the end, flow through the gas inlet / outlet 8 of the reversing plate 10 and flow through the downstream element from the gas inlet / outlet 6 at the other end to the gas inlet / outlet 5 at one end. The drain 12 condensed in the gas flow path 3 of the upper element in the direction flows down from the gas inlet / outlet 5 of the one side, and the one of the lower elements through the drain hole 9 of the reversing plate 10. Characterized in that it is configured to be discharged from the gas inlet / outlet 5 on the side of the gas turbine. 2. The gas-cooling laminated heat exchanger according to claim 1, wherein the gas passages 3 and the cooling water passages 13 are alternately arranged in the stacking direction of the plates except for the reversing plate 10. 3. The gas-cooling laminated heat exchanger according to claim 1, wherein one of a pair of plates of the element located at an intermediate portion in the laminating direction of the heat exchanger also serves as the reversing plate. . 4. The gas-cooling laminated heat exchanger according to claim 1, wherein a hole edge of the drain hole 9 protrudes downward in a funnel shape.