KR20000013976A - Heat exchanging method and device thereof - Google Patents

Abstract

PURPOSE: A heat exchanging method and a heat exchanging device are provided to promote cooling performance by inducing fluid directly into an assistant chamber. CONSTITUTION: The heat exchanging method comprises the steps of:passing the fluid to be heated to the high thermal part from the low thermal part of a passage where the fluid to be cooled flows; installing an assistant chamber on the tube plate of the high thermal part of the passage to prevent heating of the tube plate; inducing the fluid to be heated and not passing inside a shell to the assistant chamber; and flowing the fluid to be heated and not passing inside the shell in the passage of the fluid in the shell and to be heated from the assistant chamber. Therefore, heat exchange is performed.

Description

Heat exchange method and heat exchanger

The present invention relates to a shell and tube heat exchange method for performing heat exchange between fluids and a heat exchanger for implementing the method.

In general, a shell and tube heat exchanger is well used as a condenser or a heater, and in Fig. 3, the shell and tube heat exchanger is installed in parallel with, for example, a dust incinerator 2. The example used as performing heat exchange with 2 is shown.

In Fig. 3, the multi-pipe heat exchanger 1 is provided in the vicinity of the dust incinerator 2, and the outside air inlet 2a of the dust incinerator 2 is connected to the fluid outlet 24 of the fluid to be heated in the heat exchanger 1. The exhaust gas outlet 2b of the dust incinerator 2 is connected to the inlet 13 of the fluid to be cooled in the heat exchanger 1.

Between the dust incinerator 2 and the heat exchanger 1, the fluid B to be heated from the heat exchanger 1 is introduced into the dust incinerator 2 as the combustion air of the dust incinerator 2. Conversely, the hot fluid A (exhaust gas) to be cooled from the dust incinerator 2 is introduced into the heat exchanger 1 from the inlet 13 of the heat exchanger 1.

The fluid to be heated discharged from the heat exchanger 1 is supplied to the dust incinerator 2 as combustion air of the dust incinerator 2, and conversely, the high temperature array gas discharged from the dust incinerator 2 is introduced from the inlet 13 of the heat exchanger 1. The heat exchanger 1 is introduced to perform heat exchange between the two.

As shown in Figs. 3 to 5, the multi-tube heat exchanger 1 has an inlet 13 formed in the upper part of the shell 20 which is closed by the upper tube plate 11 and the lower tube plate 12, and an inlet 13 is to be cooled in the lower portion thereof. The outlet 14 of the fluid is formed. The fluid A (exhaust gas) to be cooled is introduced into the shell 20 from the inlet 13, as shown by arrow O in FIG. 5, and passes through the flow path O discharged from the outlet 14 through the plurality of tubes 21.

A plurality of tubes 21 are arranged between the upper tube plate 11 and the lower tube plate 12 (in FIG. 5, this tube 21 is used as one and the others are omitted), and the inside of the upper tube plate 11 is partitioned as a partition plate 15. Insolvency 17 is formed. Inferior chamber 17 is provided in the high temperature part of the flow path O of the shell 20.

The fluid inlet 23 of the fluid to be heated is connected to the lower part of the shell 20 side, and the fluid outlet 24 is connected to the upper part of the side of the shell 20, respectively.

The large diameter 1st piping 16 is provided in the shell 20 center part of the partition board 15, and 16a is opened in the partition board 15 at one end, and the other end 16b is opened in the inside of the shell 20 at the 1st piping 16, respectively. In the vicinity of the periphery of the shell 20 of the partition plate 15, a plurality of thin second pipes 18 having a plurality of diameters are provided (in FIG. 5, two of these second pipes 18 are shown, and others are omitted). One end 17a is opened on the partition plate 15, and the other end 17b is opened inside the shell 20, respectively. Reference numeral 19 is a baffle plate, and 30 is a coating material.

The fluid B (preheated air) to be heated is introduced into the shell 20 through the fluid inlet 23 from the first fluid introduction device 26 as shown by arrow P1 in FIG. 5, and passes through the inside of the shell 20 to discharge the fluid. In addition to the flow path P1 discharged to the outside from the 24, separately into the shell 17 through the first pipe 16 from the inside of the shell 20, as shown by the arrow P2 of FIG. It is returned to the inside and is discharged to the outside through the flow path P2 discharged from the fluid outlet 24.

In such a heat exchanger 1, while the fluid A is passing through the flow path O, the heat exchange is performed between the fluid A and the fluid B by making the fluid B pass through the flow path P1 and the flow path P2.

In the heat exchanger 1, the portion where the upper tube plate 11 of the shell 20 is provided is a portion through which the high temperature fluid A flows, which tends to become high in temperature, and in order to maintain the durability of the heat exchanger 1, it is necessary to cool the tube plate 11 portion. will be.

In the conventional heat exchanger 1, an inferior chamber 17 is provided in the site | part in which the upper tube plate 11 was installed, and the part of fluid B is made to flow through the flow path P2, and the vicinity of 11 part of upper tube plates is cooled.

In this cooling method, the shell 20 is cooled through a complicated long flow path P2 in which a part of the fluid B in the shell 20 is led from the first pipe to the insulator 17 and returned from the insulator 17 to the shell 20. There is a problem that pressure difference does not occur between the and the inferior chamber 17, so that it is impossible to sufficiently introduce the fluid B into the inferior chamber 17, and that the upper tube plate 11 cannot be sufficiently cooled.

An object of the present invention is to provide a heat exchange method and a heat exchanger capable of improving the cooling capacity by introducing the fluid B directly into the failure chamber 17.

A first feature of the present invention is to pass a fluid to be heated from the low temperature side of the flow path through which the fluid to be cooled flows to the high temperature side, and to prevent the heating of the tube plate from the tube plate on the high temperature side of the flow path. And a heat to be heated which does not pass through the shell to the inlet, and a heat to be heated which does not pass through the inside of the shell to flow through a passage of the fluid to be heated in the shell to perform heat exchange. It is a heat exchange method.

According to a second aspect of the present invention, a shell is provided with a top and bottom sealed off, and a first inlet of the fluid to be cooled at one end is provided with a first outlet of the fluid to be cooled at the other end, and an upper portion of the shell. A partition plate is provided inside the tube plate, and the gap between the upper tube plate and the partition plate is disposed between the upper tube plate and the lower tube plate, and the fluid to be cooled is transferred from the first inlet side to the first chamber. A tube for distributing to the outlet side, a first pipe whose one end is supported by the partition plate, the other end of which is opened in the shell, a second inlet of a fluid to be heated provided in the lower side of the shell, and an upper side of the shell And a first fluid introduction device connected to the second outlet of the fluid to be heated and a fluid to be heated in the shell from the second outlet. The heat exchanger provided is a heat exchanger provided with the 2nd piping which penetrated from the exterior of the said shell in the said sub chamber, and introduce | transduces the fluid from the said shell exterior to this 2nd piping.

A second feature of the present invention is that in the heat exchanger of claim 2, the length of the first pipe is set to a length at which the temperature of the fluid to be heated discharged from the second outlet is 650 ° C. Heat exchanger characterized in that.

Fig. 1 shows a first embodiment of the heat exchanger of the present invention, and is a reduced longitudinal cross-sectional view along the D-D line of the heat exchanger of Fig. 2.

FIG. 2 shows a first embodiment of the heat exchanger of the invention and is an enlarged cross sectional view along line C-C of the heat exchanger of FIG. 3.

3 is a schematic front view showing a conventional heat exchanger installed in a dust incinerator.

4 is an enlarged cross-sectional view along the line C-C of the heat exchanger of FIG.

5 is a reduced longitudinal cross-sectional view taken along line D-D of the heat exchanger of FIG. 4.

Explanation of symbols on the main parts of the drawings

1 ..... heat exchanger 2 ..... dust incinerator

11 .... upper tube 12 .... lower tube

13 .... Inlet 15 .... Partition plate

17 .. Insolvent 20 .... Shell

21 .... Tube 23 .... Fluid Inlet

26 .... First fluid introduction device 29 .... Second fluid introduction device

An embodiment of the present invention will be described based on FIGS. 1 to 2.

1 to 2, the heat exchanger 101 is denoted by the same reference numerals and the description thereof is omitted for the same configuration as the conventional heat exchanger 1. In FIG. 1, a plurality of tubes 21 provided inside the shell 20 are shown. Indicates one of them and omits the rest.

The second chamber 17 is provided with a second pipe connected from the outside of the shell 20, and the second fluid introduction device 29 is connected from the outside with the second pipe 28.

The length of the 1st piping 16 is set so that the temperature of the fluid B discharged | emitted from the fluid discharge port 24 may be 650 degreeC, when the temperature of the fluid B discharge | exchanged through the center of the shell 20, and discharged | emitted.

The heat exchanger is installed side by side in the dust incinerator, and the preheated air discharged from the heat exchanger is used as the incineration air of the incinerator, and the exhaust gas discharged from the incinerator is introduced into the shell 20 of the heat exchanger from the inlet 13 and the plurality of tubes 21 When passing through the inside and exchanging heat from the fluid outlet 14 for use, when the preheated air is discharged at a temperature of 650 ° C., the fluid B discharged into the incinerator can be introduced immediately.

In the heat exchanger of the present embodiment, the fluid B is introduced into the sub chamber 17 directly from the outside of the shell 20, flows from the sub chamber 17 into the inside of the shell 20, and the sub chamber 17, that is, the upper tube plate 11, is cooled.

In the present embodiment, the second pipe 28 is installed in the sub chamber 17, and the second fluid introduction device 29 is connected to the second pipe 28 to introduce the fluid B into the sub chamber 17. In the present invention, The connection flow path is branched from the first fluid introduction device 26 which inserts the fluid B into the shell 20 by connecting to the fluid inlet 23, and connects the branch flow path to the second pipe 28 to introduce the fluid B into the failure chamber 17. good.

1 to 2, in the heat exchanger 101, an exhaust gas at 800 ° C. is introduced from the inlet 13, and passes through a tube 21 (in FIG. 1, only one of the plurality of tubes 21 is shown and the rest are omitted). It is discharged as exhaust gas of 550 ℃ from outlet 14.

Then, the preheated air at 20 ° C. passes through the flow path P1 from the first fluid introducing device 26 through the fluid inlet 23, and is discharged as the preheated air at 650 ° C. from the fluid outlet 24. Then, the preheated air at 20 ° C. is introduced from the second fluid introduction device 29 into the shell 20 through the second pipe 28, into the shell 20 through the flow path P2, and joins the flow path P1, and the fluid outlet 24 It is discharged as preheating air of 650 ℃ from.

In the present invention, the fluid to be heated which does not pass through the shell is introduced into the sub-chamber, and the fluid to be heated which does not pass through the shell through the passage of the fluid to be heated in the shell flows from the sub-chamber to perform heat exchange. Therefore, it is possible to introduce a fluid to be sufficiently heated in the inferior chamber, and to perform heat exchange while sufficiently cooling the upper tube plate.

Since the second pipe is installed in the insulated chamber through the outside of the shell, and the fluid from the outside is introduced into the second pipe, the fluid to be sufficiently heated in the insulated chamber is introduced, and the upper pipe plate is opened. It is possible to cool sufficiently.

Further, since the length of the first pipe is set to a length at which the temperature of the fluid to be heated discharged from the second discharge port is 650 ° C, the temperature of the fluid to be heated discharged from the heat exchanger is 650 ° C. It is possible to introduce the discharge fluid directly into the dust incinerator, which is convenient.

Claims (3)

At the same time, the fluid to be cooled is passed from the low temperature side of the flow path through which the fluid to be cooled is passed to the high temperature side, and at the same time, an inlet is provided in the tube plate on the high temperature side of the flow path to prevent heating of the tube plate. A heat exchange method comprising introducing a fluid to be heated that is not heated and causing a fluid to be heated that does not pass through the shell to flow through a passage of the fluid to be heated in the shell from the insulator. The shell is provided with a tube plate sealed up and down, and the first inlet port of the fluid to be cooled at one end is provided with a first outlet port of the fluid to be cooled at the other end, A partition plate provided inside the upper tube plate of the shell and formed between the upper tube plate and the partition plate; A tube disposed between the upper tube plate and the lower tube plate and configured to distribute the fluid to be cooled from the first inlet side to the first outlet side; A first pipe having one end supported by the partition plate and the other end opened in the shell, a second inlet of a fluid to be heated provided in the lower side of the shell, A second outlet of the fluid to be heated provided on the upper side of the shell; A heat exchanger connected to the second inlet and having a first fluid introduction device or the like for introducing a fluid to be heated in the shell from the second inlet, And a second pipe which penetrates from the outside of the shell in the sub chamber, and introduces a fluid to be heated from the outside of the shell into the second pipe. The heat exchanger according to claim 2, wherein the length of the first pipe is set to a length at which the temperature of the fluid to be heated discharged from the second outlet is set at 650 ° C.