JP2000111278A - Multitubular heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive multitubular heat exchanger which requires no thick and heavy hub produced by expensive casting and forging processes and can completely meet extremely corrosive fluid such as a chemical liquid or hot spring. SOLUTION: Extremely corrosive tube sheets 2 are fixed to both the opening end parts of a barrel pipe 1 having through holes 1-2 provided on the peripheral walls of both end parts. A group of heat transfer pipes 4 are fixed and arranged onto the tube sheets 2. The barrel pipe 1 is housed in a plurally divided main body composed of a bolt fastening type resin tubular body which is axially divided into a plurality of parts and having a first heat exchanging fluid inlet 6a and an outlet at both the ends through seal rings 8-1 to 8-3. To both the ends of the main body, a bonnet provided with an inlet 6b and an outlet for second heat exchanging fluid or a second heat exchanging fluid supply piping is fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shell and tube type (multi-tube cylindrical type) heat exchanger.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional multi-tube heat exchanger of this type. This multi-tube heat exchanger
It comprises a body tube (shell) 11, a hub 12, a bonnet 13, a heat transfer tube group 14, and a baffle 15. The structure thereof is such that a hub 12 having a first heat exchange fluid inlet 12-1 and an outlet 12-2 is formed of a body. Both ends of the heat transfer tube group 14 are fixed to both ends of the tube 11, and both ends of the heat transfer tube group 14 are fixed to the hub 12, and a second heat exchange fluid inlet 13-1 is provided on one back surface of the hub 12. The bonnet 13 is fixed via a packing, and the bonnet 13 provided with an outlet 13-2 for the second heat exchange fluid at the other end is fixed via the packing. That is, in the above-described multi-tube heat exchanger, the heat transfer tube group 14 having the baffle 15 is
It is made by casting or forging, and is fixed to a hub 12 having an outflow / inflow port for fluid on the body tube (shell) 11 side by welding, brazing, or expanding, and the body tube (shell) 11 is welded or brazed to the hub 12. ing.

[0003]

However, in the case of the multi-tube heat exchanger having the above-described structure, the second heat exchange fluid supplied to the heat transfer tube is highly corrosive, such as a chemical solution or a hot spring. If it is a fluid, not only thin heat transfer tubes but also thick and heavy hubs manufactured by casting or forging in expensive processes need to be made of expensive metal with high corrosion resistance, which is costly. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the cost problem of the above-mentioned multi-tube heat exchanger, and eliminates the need for a thick and heavy hub manufactured by casting or forging in an expensive process. And to provide a multi-tube heat exchanger that can sufficiently cope with a highly corrosive fluid such as a chemical or a hot spring as the second heat exchange fluid supplied to the heat transfer tube side. It is the purpose.

[0005]

In order to achieve the above object, a first embodiment of a multi-tube heat exchanger according to the present invention comprises two shells having through holes formed in the peripheral walls at both ends. A corrosion-resistant metal heat transfer tube group is fixedly arranged on a corrosion-resistant metal tube sheet fixed to an open end, and is formed of a bolt-fastened cylindrical body divided into a plurality of tubes in the tube axis direction. The body tube is housed via a seal ring in a multiple-part resin body provided with a first heat exchange fluid inlet and an outlet communicating with the second body, and a second heat exchange fluid inlet and an outlet are provided at both ends of the body. Bonnet provided with
The second embodiment is characterized in that a heat exchange fluid supply pipe is fixed to the heat exchange fluid supply pipe. In the second embodiment, a heat transfer pipe group made of corrosion-resistant metal having a longer length than the main pipe is fixedly arranged inside the main pipe. A tube sheet made of a corrosion-resistant metal is fixed to both ends of the heat tube group, and is formed of a bolt-fastened cylindrical body divided into a plurality of tubes in the tube axis direction, and both ends are formed in the space between the body tube and the tube sheet. The body tube and the tube sheet are housed via a seal ring in a resin body having a plurality of divided structures provided with a first heat exchange fluid inlet and an outlet which are open, and a second heat exchange fluid inlet is provided at both ends of the body. And a bonnet provided with an outlet and a second heat exchange fluid supply pipe are fixed. The third embodiment is a multi-part structure of the first and second embodiments. As a resin body, (1) The fourth embodiment is characterized by comprising a cylindrical body having an inlet for a heat exchange fluid and a cylindrical body having an outlet, and the fourth embodiment is characterized in that the resin has a multi-part structure in the first and second embodiments. As a main body made of a metal tube, an intermediate cylinder body is included, and the intermediate cylinder body is made of metal. The flanged seal fixing ring is detachably fitted and fixed to both open ends of the body tube, and the outer peripheral end of the flanged seal fixing ring is attached to the inner peripheral wall of the main body. It is characterized in that it has a detachably fitted and fixed structure.

That is, the present invention employs a method in which a tube sheet made of highly corrosion-resistant metal is used in place of the conventional hub in which heat transfer tube groups are fixedly arranged, and a heat transfer tube group made of high corrosion resistant metal is fixedly arranged on the tube sheet. Adopted. Further, the body tube accommodating the heat transfer tube group and the tube sheet are divided into a plurality of structures and have a double tube structure in which at least both ends are built in a resin body (body) having a cylindrical body, and the body is not bolted. An inlet and an outlet for a first heat exchange fluid communicating with through holes formed in both end walls of the body tube at both ends of the main body;
Further, a bonnet or a second hood provided with an inlet and an outlet for the second heat exchange fluid at both ends of the body of the multiple division structure
In this structure, the heat exchange fluid supply pipe is fixed.

In the present invention, the tube sheet is made of a highly corrosion-resistant metal because the heat exchange fluid supplied to the heat transfer tube side can sufficiently cope with a highly corrosive fluid such as a chemical solution or a hot spring. This is to make it possible. In addition, the main body (body) for housing the body tube and the tube sheet is made of a resin because the resin generally has corrosion resistance, and a metal is a corrosive fluid that cannot be tolerated unless it is an expensive metal having high corrosion resistance. One of the objectives is to reduce the weight of the heat exchanger itself, but also because of the heat insulation and heat insulation effect combined with the double shell. is there. The reason why the resin body is divided into a plurality of parts is to facilitate disassembly and cleaning of the core portion (the body tube, the tube sheet, the heat transfer tube group, the baffle plate, etc.). When it is composed of three or more cylinders, only the cylinders at both ends may be made of resin, and the intermediate cylinder may be made of metal.

Further, in the present invention, a slight gap is formed between the body tube and the body containing the body tube, but the gap between the body tube and the body is sealed by a seal ring. The first heat exchange fluid supplied from the first heat exchange fluid inlet
The entire amount of the heat exchange fluid is supplied into the body tube without leaking into the gap between the body tube and the main body, and the heat exchange fluid flows across the heat transfer tube group divided by the baffle plate a plurality of times. When the temperature is lower than the fluid temperature, a high heat exchange rate can be obtained due to the effect of the air heat insulating layer formed in the gap between the body tube and the main body. It goes without saying that a seal ring is also provided between the tube sheet and the main body.

[0009]

FIG. 1 is a longitudinal sectional side view partially showing an embodiment of a multitubular heat exchanger according to the present invention, and FIG. 2 is a partial view showing another embodiment of the present invention. FIG. 3 is an enlarged sectional view of a main part showing another embodiment of the present invention, and FIG. 4 is a perspective view showing a shell-and-tube of the multi-tube heat exchanger shown in FIG. 1, 1 is a body tube (shell), 1-1, 1-2 are through holes,
2 is a tube sheet, 3 is a bonnet, 3a is a second heat exchange fluid inlet, 3b is a second heat exchange fluid outlet, 4 is a heat transfer tube group, 5 is a baffle plate, 6 is a main body, and 6a is a first heat exchange fluid inlet. , 6b is a first heat exchange fluid outlet, 7 is a fixing ring for a flanged seal, 8-1, 8-2, 8-3 are seal rings, 9a, 9b are fastening bolts, and 10 is an air heat insulating layer.

First, a multitubular heat exchanger according to the present invention shown in FIG. 1 has a divided cylindrical body 6-1 having left and right ends having a first heat exchange fluid inlet 6a and an outlet 6b, and a divided cylinder interposed therebetween. A body 6-2 made of a corrosion-resistant resin or a heat-resistant / corrosion-resistant resin having a three-part structure in which a stainless steel fastening bolt 9a is used to fasten through a sealing material 8-4 with a flange joint. Body tube 1 made of SUS304, tube sheet 2 made of TP340H (titanium plate) having extremely high corrosion resistance, TTH340W also having extremely high corrosion resistance
A core portion including a heat transfer tube group 4 made of C (titanium tube) and a baffle plate 5 made of SUS304 is housed. That is, through holes 1-1, 1 and 1 are formed in the peripheral walls at both ends.
The tube sheet 2 made of a highly corrosion-resistant metal is fixed to both open ends of the body tube 1 in which -2 is drilled, and the heat transfer tube group 4 made of the highly corrosion-resistant metal is fixedly arranged on the tube sheet. Each of the tube sheets 2 has a silicone rubber seal ring 8.
-1, 8-2, 8-3 made of corrosion resistant resin or heat resistant
It is housed in a main body 6 made of corrosion resistant resin. In this case, the sealing performance of the silicone rubber seal ring is sufficient only at both ends of the body tube 1. However, when the silicone rubber seal ring 8-2 is also provided at the center of the body tube 1 as shown in the figure. Further, not only the sealing performance but also the vibration absorption resistance is further improved. An air insulation layer 10 is formed in a gap between the body tube 1 and the resin body 6. In the heat transfer tube group 4, baffle plates 5 having openings are arranged at intervals and the openings are alternately arranged vertically. Bonnets 3 are fixed to both ends of the resin body 6 with fastening bolts 9b, and the bonnet 3 has an inlet 3a for a second heat exchange fluid.
And an outlet 3b.

Although the bonnet 3 in the above configuration comes into contact with the highly corrosive second heat exchange fluid supplied to the heat transfer tube side, the bonnet 3 is usually thick and does not need to be particularly corrosion resistant. It is often sufficient to use a metal material such as (gun metal) or SCS13 (stainless steel casting). However, in the case of the tube sheet 2, it is necessary to have extremely high corrosion resistance because corrosion and cracks due to the corrosion easily occur in a portion fixed to the heat transfer tube group 4 by welding or expansion.
Further, it is preferable to provide a large number of axial ribs 16 on the outer periphery of the body 6 having a plurality of divided structures in order to increase bending rigidity and torsional rigidity. In addition, the main body 6 having the multiple division structure includes:
Since the intermediate cylinder 6-2 is made of iron or stainless steel, the strength is enhanced, and the thermal expansion coefficient of the intermediate cylinder 6-2 is close to that of the heat transfer tube.

Next, the multi-tube heat exchanger shown in FIG. 2 is an example in which the body tube is shorter than the heat transfer tube in order to further reduce the weight. That is, the multitubular heat exchanger shown in FIG. 2 is different from the multitubular heat exchanger shown in FIG. 1 in that the inlet 6a and the outlet 6b of the first heat exchange fluid provided at both ends of the main body 6 having a plurality of divided structures. A body tube 1 having a length whose opening end is located at a substantially inner position is used, and a heat transfer tube group 4 arranged in the body tube 1 is fixedly arranged on a tube sheet 2 having extremely high corrosion resistance. A first heat exchange fluid inlet 6a is provided in the space between the tube sheets 2.
And the outlet 6b is opened.
Preferably, the body tube 1 is welded or brazed to the baffle plate 5.

In the multitubular heat exchanger shown in FIGS. 3 and 4, the body tube 1 in the multitubular heat exchanger shown in FIG. In this case, a flanged sealing fixing ring 7 is detachably fitted to both ends of the opening of the body tube 1 having a radially divided structure, and an outer periphery of the flanged sealing fixing ring 7. The end portion is detachably fitted and fixed to the inner peripheral wall of the main body 1 via a seal ring 8-1. Although FIGS. 3 and 4 show the body tube 1 having a split structure, it is also possible to adopt a structure having two or more portions.

The multi-tube heat exchanger shown in FIGS. 1 to 4 employs a system in which the second heat exchange fluid is supplied to the heat transfer tube group 4 through the bonnets 3 fixed to both ends of the main body 6. However, the method of supplying the second heat exchange fluid to the heat transfer tube group 4 may be a method in which supply pipes are directly connected to both ends of the main body 6 and supplied instead of the bonnet 3.

[0015]

As described above, the multitubular heat exchanger of the present invention has the following effects. That is,
Instead of the conventional hub in which the heat transfer tube groups are fixedly arranged, a method in which a tube sheet having extremely high corrosion resistance is used, and a heat transfer tube group having extremely high corrosion resistance is fixedly arranged on the tube sheet, and the heat transfer tube group is used. By adopting a double-pipe structure in which the body tube and tube sheet to be housed are built into the body (body) consisting of a multiple-part resin resin cylinder,
This eliminates the need for expensive hubs and reduces costs, and even when the heat exchange fluid supplied to the heat transfer tube side is a highly corrosive fluid such as a chemical solution or hot spring, the heat exchange fluid comes into contact with the heat exchange fluid. , The tube sheet and the resin surface alone are sufficient to cope with this. In addition, since the body tube and the tube sheet are housed in a resin body, the heat retention of the body tube is improved, and the heat exchanger itself is improved. It is possible to reduce the weight and to simplify disassembly and cleaning of the core part (body tube, tube sheet, heat transfer tube group, baffle plate, etc.). In addition, since the gap between the body tube and the main body is configured to be sealed by a seal ring, the entire first heat exchange fluid supplied into the body tube does not leak into the gap between the body tube and the body, and the entire amount of the first heat exchange fluid inside the body tube does not leak. And the effect of the air insulation layer formed in the gap between the body tube and the main body is added, so that a high heat exchange rate can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view partially showing an embodiment of a multitubular heat exchanger according to the present invention.

FIG. 2 is an enlarged longitudinal sectional side view of a main part showing another embodiment of the present invention.

FIG. 3 is an enlarged vertical sectional side view of a main part showing another embodiment of the present invention.

FIG. 4 is a perspective view showing a shell-and-tube heat exchanger shown in FIG. 3 with a part of a body tube omitted.

FIG. 5 is a longitudinal sectional side view showing a part of an example of a conventional multi-tube heat exchanger to which the present invention is applied;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body tube (shell) 1-1, 1-2 Through-hole 2 Tube sheet 3 Bonnet 3a 2nd heat exchange fluid inlet 3b 2nd heat exchange fluid outlet 4 Heat transfer tube group 5 Baffle plate 6 Resin main body 6a 1st heat exchange Fluid inlet 6b First heat exchange fluid outlet 7 Fixed ring for flanged seal 8-1, 8-2, 8-3 Seal ring 8-4 Seal material 9a, 9b Fastening bolt 10 Air insulation layer

Claims (5)

[Claims] A heat transfer tube group made of corrosion-resistant metal is fixedly arranged on a corrosion-resistant metal tube sheet fixed to both open ends of a body tube having through holes formed in both peripheral walls, and a plurality of heat transfer tube groups are arranged in the axial direction of the tube. The body tube is provided via a seal ring to a resin body having a plurality of divided structures comprising a bolt fastening type cylindrical body divided into a plurality of parts and a first heat exchange fluid inlet and an outlet communicating with the through hole at both ends. Characterized in that a bonnet provided with a second heat exchange fluid inlet and an outlet at both ends of the main body or a second heat exchange fluid supply pipe is fixed. vessel. 2. A heat-resistant tube group made of corrosion-resistant metal, which is longer than the body tube, is fixedly arranged inside the body tube, and a tube sheet made of corrosion-resistant metal is fixed to both end portions of the heat-transfer tube group. A first part is formed of a plurality of divided bolted cylinders and has a first opening at both ends which is open to a space between the body tube and the tube sheet.
The body tube and the tube sheet are housed via a seal ring in a resin body having a plurality of divided structures provided with a heat exchange fluid inlet and an outlet, and a second heat exchange fluid inlet and an outlet are provided at both ends of the body. A multi-tube heat exchanger, wherein the bonnet or the second heat exchange fluid supply pipe is fixed. 3. The multi-tube heat exchanger according to claim 1, wherein the resin body having a plurality of divided structures includes a cylindrical body having an inlet for the first heat exchange fluid and a cylindrical body having an outlet. 4. The multi-tube heat exchange according to claim 1, wherein the resin body having a plurality of divided structures includes an intermediate cylinder, and the intermediate cylinder is made of metal. vessel. 5. A structure in which the body tube is radially divided into two parts, and a flanged seal fixing ring is detachably fitted to both open ends of the body tube, and the flanged seal is fixed. 3. The multi-tube heat exchanger according to claim 2, wherein an outer peripheral end of the ring is detachably fitted and fixed to an inner peripheral wall of the main body.