JPH0245655Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a large cross-flow type heat exchanger used for heat recovery from exhaust gas, etc.

(Prior art) Ceramic heat exchangers with excellent heat resistance are used to recover heat from high-temperature exhaust gas, but conventional heat exchangers of this type are
As shown in Publication No. 12990, a large number of ceramic plates with many parallel ribs are laminated at right angles to each other and fired to form a single piece. It was difficult to manufacture products with a length of 30 cm or more. However, such a heat exchange element has a power consumption of 50ONm ³ /
The drawback was that it was only possible to process exhaust gas of about 100 hr, and in order to recover heat from a large amount of exhaust gas, it was necessary to use multiple heat exchangers connected in parallel with pipes. Therefore, attempts have been made to combine and incorporate multiple heat exchange elements inside a single housing, but in this type of ceramic heat exchange element, there is a limit to the dimensional accuracy of each through hole, and the joint surface The through-holes tend to be misaligned with each other, resulting in gas leaks and large pressure losses, and it has been difficult to manufacture a heat exchanger that incorporates at most two heat exchange elements.

(Problems that the invention attempts to solve) This invention solves these conventional problems,
It was developed with the aim of creating a large heat exchanger that can process large amounts of high-temperature gas, has no gas leaks, has low pressure loss, and is easy to manufacture.

(Means for Solving the Problems) In the present invention, heated fluid through holes and heated fluid through holes extending perpendicularly thereto are alternately formed inside, and a seal of a predetermined width is formed on the peripheral edge of each opening surface. A plurality of heat exchange elements each having an engaging stepped portion formed on the peripheral edge of the aperture surface that serves as a joining surface is joined to each other and a space is formed between the joining surfaces. The device is characterized in that it is integrated into one body and hermetically sealed inside the housing.

(Embodiment) Next, the present invention will be described in detail with reference to the illustrated embodiment. 1 consists of a metal case 1a and a fireproof wall 2 pasted on the inside thereof, a heating fluid inlet 3, a heating fluid flow outlet 3a, heated fluid inlet 5,
A housing is provided with heated fluid outlet ports 5a on all sides, and 6 is a heat exchange body hermetically sealed inside the housing 1, in which 12 heat exchange elements 7 of 2×3×2 are joined. It is integrated. As shown in FIGS. 2 and 3, each heat exchange element 7 has a large number of parallel heated fluid through holes 8 and a large number of parallel heated fluid through holes 9 extending in a direction perpendicular to the thin-walled heating fluid through holes 8. They are formed alternately with ceramic partition walls interposed therebetween, and can be manufactured by a method in which ribbed plates made of ceramic such as alumina, mullite, cordierite, etc. are alternately laminated one by one and then baked and integrated. Such a heat exchange element 7 has four aperture surfaces, and the peripheral edge of each aperture surface has a predetermined width of about 10 to 30 mm, and preferably the same ceramic material as the heat exchange element 7 has through holes. The seal portion 1 is embedded in the through hole and both ends of the through hole are sealed.
0, and a spigot-type engagement step 11 is formed at least on the peripheral edge of the aperture surface that becomes the joint surface with the adjacent heat exchange element 7. Further, one of the engaging step portions 11, for example, the opening surface surrounded by the convex engaging step portion 11 is formed to be recessed by 5 to 10 mm, as shown in FIG. Thus, when adjacent heat exchange elements 7, 7 are joined together, a space 12 having a thickness of 5 to 10 mm can be formed between each element. Such a plurality of heat exchange elements 7, 7 are airtightly joined by engaging each other's engaging step portions 11, 11 and interposing an inorganic adhesive layer 13 on the engaging surfaces. At this time, a space 12 is formed between the joint surfaces. If an inorganic adhesive having a coefficient of thermal expansion similar to that of the heat exchange element 7, such as a glaze type adhesive, is used, troubles such as cracks due to thermal expansion during use can be prevented.

(Function) The device configured as described above guides a heated fluid such as high-temperature exhaust gas discharged from an industrial furnace or the like to the heated fluid inlet 3 of the housing 1, and also guides the heated fluid such as high-temperature exhaust gas discharged from an industrial furnace or the like to the heated fluid inlet 5 of the housing 1. When a fluid to be heated such as air to be heated is introduced, these fluids pass through the heated fluid through holes 8 of the plurality of heat exchange elements 7 hermetically sealed inside the housing 1 and the cover extending perpendicularly thereto. Similar to conventional heat exchangers of this type, heat exchange is performed through thin partition walls while flowing through the heated fluid through holes 9 respectively. However, in the present invention, a seal portion 10 of a predetermined width is provided at the peripheral edge of the aperture surface of each heat exchange element 7, and an engaging step portion 11 is formed on the seal portion 10, which becomes the joint surface. By joining the engaging step portions 11 with an inorganic adhesive, it is possible to integrate a plurality of heat exchange elements 7 without causing gas leakage, and there is no risk of gas leakage and a large amount of heat exchanger elements 7 can be integrated. It is capable of processing fluid to be heated. In addition, heating fluid through holes 8 are provided between the joint surfaces of each heat exchange element 7, 7.
Since a space 12 is formed in the opening surface of the heated fluid through hole 9 and the opening surface of the heated fluid through hole 9, even if the positions of the through holes of the adjacent heat exchange elements 7, 7 are shifted, In this case, the fluid once flows into these spaces and then enters the next heat exchange element 7.
The heat exchange efficiency can be improved and the pressure loss can be made extremely small.

(Effects of the invention) As is clear from the above explanation, the present invention can be used to create a heat exchanger of any size by combining heat exchange elements. It is suitable for heat recovery from furnaces, etc., and it also skillfully solves the problems of gas leaks and increased pressure loss that tend to occur when joining heat exchange elements, achieving high heat exchange efficiency. Therefore, its practical value is extremely great as it solves the problems of conventional heat exchangers of this type.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a partially cutaway front view of the main part thereof, and FIG. 3 is a partially cutaway perspective view showing a single heat exchange element. 1...Housing, 7...Heat exchange element, 8...
Heated fluid through hole, 9... Heated fluid through hole, 10
. . . Seal portion, 11 . . . Engagement step portion, 12 . . . Space.

Claims (1)

[Claims for Utility Model Registration] 1. Heated fluid through holes 8 and heated fluid through holes 9 extending perpendicularly thereto are alternately formed inside, and a seal portion 10 of a predetermined width is provided at the peripheral edge of each opening surface.
A plurality of heat exchange elements 7 each having an engaging step portion 11 formed on the peripheral edge of the aperture surface that serves as a joining surface are connected to each other while joining the engaging steps 11, 11 to each other and between the joining surfaces. A heat exchanger characterized in that a space 12 is formed and integrated, and the heat exchanger is hermetically sealed within a housing 1. 2. The heat exchanger according to claim 1, in which the heat exchange element 7 is made of ceramic. 3. The heat exchanger according to claim 1 or 2, wherein the heat exchange elements 7, 7 are joined together using an inorganic adhesive whose coefficient of thermal expansion is similar to that of the heat exchange element 7. vessel.