JPS5943705B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compact air-gas heat exchanger (hereinafter referred to as heat exchanger), and particularly to a heat exchanger used in a wide range of gas temperatures of 500°C or higher. be.

As shown in FIG. 1, a conventional heat exchanger has a structure in which corrugated spacer plates 2 and 3 are stacked at an intersection 71' with a partition plate 4 in between.

In order to improve the fin action, the spacer plates 2, 3 and the partition plate 4 are generally joined by brazing or doweling of zinc or the like.

However, when such a heat exchanger 1 is used in a high-temperature gas of about 700 to 800°C in a direct combustion deodorizing device or an incinerator, the materials of the spacers 2, 3 and the partition plates 4 may be made of stainless steel or the like. Not only must the material have good high-temperature corrosion resistance, but the joining material for the spacer plates 2, 3 and the partition plate 4 must also be selected from materials that have good corrosion resistance in the high-temperature parts.

Therefore, Ni-based brazing material is generally used for these joints H, but this Ni-based brazing is performed in a vacuum at 120°C.
It is necessary to heat the material to be brazed to about 0°C, which requires a vacuum furnace that can raise the temperature to about 1300°C.

Therefore, such a heat exchanger is not only expensive to manufacture, but also has the disadvantage that it is not possible to make a very large heat exchanger due to the size restriction of the vacuum furnace.

The present invention has been made in view of the above-mentioned drawbacks, and it solves the above-mentioned drawbacks by dividing a conventional heat exchanger into a high-temperature section and a low-temperature section at 400 to 500°C in the gas flow direction. It is designed to reduce the

An embodiment of the present invention will now be described with reference to FIG.

That is, the high-temperature heat exchanger 11 consists of wavy spacer plates 12 and 13 stacked alternately with the partition plates 14 interposed in a crosswise manner, and the spacer plates 12 and 13 and the partition plate 14 are vacuum-brazed with a Ni-based brazing material. Attach and configure.

Similarly, one of the low-temperature heat exchangers 21 is laminated with the partition plates 24 interposed so that the wavy space plates 22 and 23 cross each other. Configure by brazing with.

Then, a packing 31 is sandwiched between the 7 flange 15 attached to one end of the high-width heat exchanger 11 and the flange 25 attached to one end of the low-temperature heat exchanger 21, and these are connected with bolts 32 to form a single unit. Use as a heat exchanger.

In consideration of corrosion resistance, it is preferable to use stainless steel for all materials.

Next, we will discuss its effect.

Gas at about 700°C flows in the direction of arrow A, and air to be preheated flows in the direction of arrow B, and they exchange heat with each other.
The high-temperature heat exchanger 11 is designed so that the temperature is 500° C. or lower at the outlet of the high-temperature heat exchanger 11 due to heat exchange during the passage through the high-temperature heat exchanger 11.

The gas whose temperature has reached 500° C. or lower in this manner then enters the low temperature heat exchanger 21, where the gas undergoes heat exchange and is exhausted.

As mentioned above, since the temperature of the gas flowing into the low temperature heat exchanger 21 is below 500°C, the spacer plates 22, 23 and the partition plate 2
Even if the bonding in No. 4 is done by Ag-based brazing, it is bonded without melting.

By dividing a conventional heat exchanger into a high-temperature section and a low-temperature section as in the present invention, the performance of the conventional heat exchanger is not impaired, and there are many advantages as shown below.

(a) If the low-temperature heat exchanger side is joined with Ag-based brazing as shown in the example, the Ag-based brazing is Ni.
Unlike brazing the base, a vacuum furnace is not required, and a continuous heating furnace can be used, and the heating temperature can be as low as about 800°C, making it easy to manufacture and at low manufacturing cost.

(b) Conventional heat exchangers were designed and manufactured to the same specifications based on the highest temperature of the input gas, which resulted in excessive specifications in the low-temperature section, resulting in a lot of wastage. In this respect, the present invention separates the high-temperature section and the low-temperature section, so that such waste can be eliminated.

, (/c) Conventional heat exchangers were limited by the size of equipment such as vacuum furnaces, and it was not possible to make very large heat exchangers, but with the present invention, the size of the heat exchanger in the low temperature section is reduced. Capacity can be increased.

(2) By dividing the heat exchanger, the size of the heat exchanger is halved, and the small heat exchanger can be replaced as a single unit, making manufacturing and assembly easier.

(If one heat exchanger is damaged in one place, the entire unit must be replaced, but with the present invention, even if one of the heat exchangers is damaged, only that one part must be replaced.) It has the advantage that all you need to do is replace it.

In the above embodiment, the image is divided into two, but depending on the purpose, even if the image is divided into more than that, there is no difference (one can be changed).

[Brief explanation of the drawing]

FIG. 1 is a three-dimensional view showing a conventional compact air-gas heat exchanger, and FIG. 2 is a partially cutaway three-dimensional view showing an embodiment of the present invention. In the figure, 11 is a high temperature heat exchanger, 12.13 is a spacing plate, and 14
is a partition plate, 15 is a flange, 21 is a low temperature heat exchanger, 2
2.23 is a spacing plate, 24 is a partition plate, 25 is a flange, 3
1 is Gutsukin, 32 is Boruto.

Claims (1)

[Claims] An air-gas heat exchanger in which gas of 1500° or more and air to be preheated flow through it is stacked in a pattern q with a partition plate interposed so as to cross the wavy spacer plates, and the above spacer plate and the partition A high-temperature heat exchanger in which the plates are vacuum-brazed with Ni-based brazing material and a force-receiving force-receiving device with wavy spacing plates cross-layered are stacked via a partition plate. A heat exchanger 0 characterized in that it is divided into a low-temperature heat exchanger brazed with a brazing material of