JPH11108568A - Heat exchange method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new mechanism that improves the efficiency of a heat exchange mechanism and can be easily cleaned, inspected, repaired, and handled. SOLUTION: When heat is exchanged by arranging a plurality of heat exchange pipes 4, and by circulating a fluid to be heated and a heating fluid inside and outside the heat exchange pipes 4, the fluid to be heated and the heating fluid are mixed separately than, at the intermediate parts the fluid to be heated is divided for introducing into a plurality of heat exchange pipes 4, and the heat exchange pipes 4 are heated and subjected to heat exchange by the heating fluid after mixing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for heat exchange, which aims to provide a new mechanism that improves the efficiency of a heat exchange mechanism and facilitates handling such as cleaning, inspection, repair and repair. It is.

[0002]

2. Description of the Related Art Various heat exchange mechanisms for exchanging heat in various fluids have been proposed in the past, and the applicant has simply updated the heat exchange function to obtain an advantageous heat exchange function. Patent application 5-30
8573 (Japanese Unexamined Patent Publication No. 7-139891), in which a heat exchange chamber for introducing and discharging a primary fluid is provided with a group of heat exchange tubes for circulating a secondary fluid. It is proposed to provide end plates each of which has a condensed portion, and to provide the heat exchange tube group integrally at the end plates so as to be detachable from the heat exchange chamber. However, as described in the above application, there is an advantage that an advantageous heat exchange function can be obtained.

[0003] In such a heat exchange facility,
Naturally, it is preferable to increase the heat exchange efficiency. For example, a forward flow type, a reverse flow type, a cross type, or the like is adopted as a flow direction of the primary fluid and the secondary fluid. Various proposals have been made on the material and structure of the exchange tube.

[0004]

Although it is clear that the above-mentioned conventional device can obtain a certain heat exchange efficiency, it is necessary to improve the heat exchange efficiency in terms of material, structure or operation. There are disadvantages that it is expensive and complicated, and that it is not always possible to improve the efficiency.

[0005]

SUMMARY OF THE INVENTION The present invention has been studied to solve the above-mentioned problems in the prior art, and provided a mixing chamber at an intermediate portion in the flow direction of the arranged heat exchange tubes to provide a mixing chamber inside and outside the tubes. It is a thing which succeeded in aiming at improvement of preferable heat exchange efficiency by aiming at the distribution which converted the laminar flow relation, and is as follows.

(1) A plurality of heat exchange tubes are arranged, and when a fluid to be heated and a heating fluid are circulated inside and outside of the heat exchange tubes to perform heat exchange, the heat exchange tubes are arranged at an intermediate portion in the flow direction of the heat exchange tubes. The heating fluid and the heating fluid are separately mixed, and then the heating fluid is divided and introduced again into the plurality of heat exchange tubes, and the heat exchange tubes are heated and exchanged by the mixed heating fluid. Heat exchange method.

(2) A plurality of heat exchange tubes are disposed between the inlet and the outlet of the heating fluid or the fluid to be heated, and these heat exchange tubes are integrally covered on one end side of a storage cylinder. A first mixing chamber having an inlet for the heating fluid and an outlet at the other end is provided at the other end, and a first mixing chamber having an opening at the middle of the heat exchange tubes is formed at the middle of the heat exchange tubes. A heat exchange device, wherein a second mixing chamber enclosing the first mixing chamber is provided also in an intermediate portion.

(3) The inlet and outlet of the fluid to be heated, which are provided for the plurality of heat exchange tubes, and the inlet and the outlet of the housing cylinder in which the heat exchange tubes are integrally housed. (2) The heat exchange device according to the above (2), wherein the heat exchange device is provided in an opposed shape to form a backward flow in the heat exchange tube and the housing cylinder.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention as described above will be described with reference to the accompanying drawings. First, the present inventor arranges heat exchange tubes, and heats the inside of the heat exchange tubes. According to the results of a detailed study on the mechanism of sending heat fluid to the peripheral side of the heat exchange tube while passing the fluid and exchanging heat, the results show that heat exchange is performed regardless of whether the heating fluid and the fluid to be heated are liquid or gas. The heating fluid and the fluid to be heated tend to form a film on the inner and outer surfaces of the pipe. There was a tendency for the fluid to be heated to be heated at a very high temperature and the heating fluid to be cooled to a relatively high degree, and it was presumed that the heat exchange action had a tendency to stagnate considerably.

[0010] To prevent the stagnation tendency of the heat exchange action as described above, studies have been made. However, it is necessary to effectively eliminate the stagnation phenomenon of the liquid or gas on the inner and outer surfaces of the heat exchange tube wall. Should be virtually impossible, especially under conditions where the heat exchange tubes are closely arranged. Therefore, at the position where heat exchange has progressed appropriately, the fluid inside and outside the heat exchange tube is temporarily separated and mixed, and the temperature conditions of the heating fluid and the fluid to be heated are once made uniform, and then the inside and outside of the heat exchange tube are returned again. It was presumed that feeding and continuing the heat exchange would appropriately promote the flow of each fluid, and could achieve a favorable heat exchange with a relatively simple mechanism improvement.

That is, as shown in FIG. 1, the general structure of the heat exchanger according to the present invention based on the above-described technical concept is to connect a plurality of heat exchange tubes 4 to each other through a fluid passage section as shown in FIG. A spacer 16 which is orthogonal to the heat exchange tube 4 is used to keep a substantially constant interval, and a partition seal member 15 as shown in FIG.
Are appropriately provided and assembled, and the sealing member 6 is interposed and connected between the engaging male end 11 and the engaging female end 12, so that such a group of heat exchange tubes 4 is as shown in FIG. The heated fluid inlet 7 and its outlet 8 are provided at the end surfaces of the enlarged diameter portions 1, 1 formed at the ends of the enlarged diameter portions 1, 1 formed at the ends of the storage cylinder 2.

As shown in FIG. 3, the heat exchange tubes 4 set as described above are located at the middle portion in the flow direction.
A first mixing chamber 13 having an open middle portion is formed, and the middle portion of the storage tube 2 accommodating the group of heat exchange tubes 4 is formed into a large-diameter enlarged portion 20 having an enlarged diameter. Room 1
A second mixing chamber 14 is formed between the first and second heat exchanger tubes 3 and 3 to discharge the heated fluid introduced into one of the heat exchange tubes 4 from the heated fluid introduction port 7 to the first mixing chamber 13 to perform a mixing operation. The heating fluid flowing from the heating fluid inlet 9 to the outlet 10 is also mixed in the second mixing chamber 14.

That is, the fluid to be heated mixed in the first mixing chamber 13 as described above is then introduced into the next heat exchange pipe 4 connected to the heated fluid outlet 8 and discharged from the outlet 8. However, the fluid to be heated heated by the heating fluid introduced from the inflow port 9 in the heat exchange pipe 4 while being discharged from the inlet 7 to the first mixing chamber 13 is heated along the inner surface of the wall of the heat exchange pipe 4. The high-temperature portion having a high effect flows, and the low-temperature portion having a low heating effect flows in the central portion of the heat exchange tube 4. Are mixed appropriately. In other words, the fluid to be heated becomes substantially constant and is sent from the first mixing chamber 13 to the group of heat exchange tubes 4 that communicate with the next fluid outlet 8 to be heated.

While the fluid to be heated is sent from the inlet 7 to the first mixing chamber 13, the heating fluid flowing from the inflow port 9 and flowing along the heat exchange tube 4 loses heat by heating the fluid to be heated. The heating fluid centered on the cooling fluid cooled in this way reaches the second mixing chamber 14 as described above and is separated from the surface of the heat exchange tube 4 to be separated from the second mixing chamber 14. It is made to enter the mixing chamber 14. That is, as described above, the cooled heating fluid flowing along the heat exchange tube 4 and the heating fluid that flows at a position distant from the heat exchange tube 4 and are poorly cooled are mixed in the second mixing chamber 14. Since it is supplied between the group of heat exchange tubes 4 on the outlet 8 side for sending the mixed and heated fluid to be heated from the first mixing chamber 13, it is mixed in the second mixing chamber 14 and heated on the surface of the heat exchange tubes 4. The renewed heating fluid provides an efficient heating effect to the mixed and uniformed fluid to be heated.

According to the present invention as described above, the length of each heat exchange tube 4 is generally halved, and if the first mixing chamber 13 and the second mixing chamber 14 as described above are further combined. If adopted, the thermal efficiency is further increased, and the length of each heat exchange tube 4 is further reduced. However, in any case, since the length of the heat exchange tube 4 is shortened, the heat exchange at the time of renewing the heat exchange function by cleaning scales and scales generated when this type of heat exchange mechanism is put into practical use. Easy disassembly and assembly of pipes,
We aim at simple and efficient cleaning and accompanying function updates.

[0016]

[Examples and Comparative Examples]

[Case of Countercurrent Inflow] A specific example of the heat exchange processing according to the present invention as described above will be described.
5.5mm inside a 200mm 200mm inside diameter storage tube
121 heat exchange tubes of carbon fiber pipes having a diameter of 6 mm and an outer diameter of 6 mm were provided (heat transfer area 2.96 m ² ).
Using a heat exchange mechanism according to 139891, tap water at 25 ° C. is fed as heated water at a rate of 100 liters per minute,
Using hot water heated to 65 ° C as heating water, 10
As a result of heat exchange treatment by feeding countercurrently at a rate of 0 liters, hot water heated to 28.6 to 31.7 ° C. (average 29.8 ° C.) is obtained at a rate of 100 liters / min per minute. I was able to.

According to the present invention for the comparative example as described above,
Similarly, a carbon fiber pipe having a length of 1300 mm, an inner diameter of 100 mm, and an inner and outer diameter of 600 mm in a storage cylinder having a first mixing chamber having an inner diameter of 84 mm formed in the middle thereof is the same as that of the comparative example described above. As shown in FIG. 3, two heat exchange tube groups each having a length of 1300 mm and a first mixing chamber of 84 mm interposed between the heat exchange tubes are provided between the ends of the heat exchange tubes. In the case where the first mixing chamber 13 opposed at an interval of 84 mm and the second mixing chamber 14 formed at an outer side of the mixing chamber at a distance of 42 mm are formed (heat transfer area is 2.96 m ² ),
The results of the heat exchange treatment by feeding countercurrent and supplying the heated water and the heated water at the same supply rate and temperature as in the comparative example were as follows. 100 liters per minute of warm water heated to an average of 37.5 ° C. It was found that such a result was an improvement of the heat exchange efficiency by an average of 28.5% with respect to the result of the comparative example described above.

[0018]

[Stainless steel pipe] A specific example of the heat exchange processing when a stainless steel pipe is used for the above-described carbon fiber pipe will be described. In a storage cylinder having a length of 1300 mm and an inner diameter of 100 mm. Inside diameter
Using a heat exchange mechanism according to JP-A-7-139891 in which glass wool is wound to a thickness of 20 mm on a storage cylinder provided with a stainless steel pipe having a 5.5 mm outer diameter and a 6 mm outer diameter, and a temperature of 25 ° C.
Of tap water was supplied at a rate of 100 liters per minute as heated water, and hot water heated to 65 ° C. was supplied countercurrently at a rate of 100 liters per minute as heated water to perform a heat exchange treatment. The result is that warm water heated to an average of 34.8 ° C is heated at 10 per minute.
0 liters could be obtained.

According to the present invention, a stainless steel pipe having the same inner and outer diameters as that of the above-described comparative example is used as a heat exchange pipe in the above-described storage tube. As shown in FIG. 3, the first mixing chamber 13 and the second mixing chamber 1 formed outside the first and second heat exchange pipes 13 and 84 are disposed at intervals of 84 mm between the ends of the heat exchange pipes.
In a device in which glass wool having a thickness of 20 mm was similarly wound around the device having No. 4 and the temperature and the supply amount of the heated water and the heated water were the same as in the comparative example, the heat exchange treatment was carried out by feeding countercurrently. Hot water heated to 0.2 ° C. was obtained at a rate of 100 liters per minute, and such a result was known to be a favorable heat exchange efficiency improvement over the result of the comparative example.

[0020]

According to the present invention as described above, the heat exchange function is appropriately improved, the desired heat exchange efficiency is accurately improved, and the heat exchange function of the heat exchange mechanism is reduced by shortening the heat exchange tube. It is an invention which has an effect that it can be easily renewed, and has a large industrial effect.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing the general configuration of a heat exchange device according to the present invention.

FIG. 2 is a side view showing a configuration state of the heat exchange tube group.

FIG. 3 is a partially enlarged sectional view of the mixing chamber portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage cylinder expansion part 2 Storage cylinder 3 1st mixing chamber 4 Heat exchange tube 5 2nd mixing chamber 6 Seal material 7 Heated fluid inlet 8 Heated fluid outlet 9 Heating fluid inlet 10 Heating fluid outlet DESCRIPTION OF SYMBOLS 11 Engagement male end part 12 Engagement female end part 13 1st mixing chamber 14 2nd mixing chamber 15 Partition seal material 16 Spacer 17 Fluid passage part 20 Enlarged part

Claims (3)

[Claims] 1. A plurality of heat exchange tubes are arranged, and when a fluid to be heated and a heating fluid are circulated inside and outside of the heat exchange tubes to exchange heat, the heat exchange tubes are arranged at an intermediate portion in a flow direction of the heat exchange tubes. The fluid to be heated and the fluid to be heated are separately mixed, and then the fluid to be heated is divided and introduced again into a plurality of heat exchange tubes, and the heat exchange tubes are heated and exchanged by the mixed fluid. Heat exchange method. 2. A plurality of heat exchange tubes are disposed between an inlet and an outlet of a heating fluid or a fluid to be heated, and the heat exchange tubes are integrally heated at one end side of a storage cylinder. A first mixing chamber having an inlet for the fluid and an outlet on the other end is provided at the other end thereof, and an intermediate portion of the heat exchange tubes is opened at an intermediate portion of the heat exchange tubes. A heat exchange device, wherein a second mixing chamber enclosing the first mixing chamber is also provided in the section. 3. An inflow port and an outflow port of a fluid to be heated, which are provided for a plurality of heat exchange tubes, and an inlet and an outlet of a housing cylinder in which the heat exchange tubes are integrally housed. 3. The heat exchange device according to claim 2, wherein the heat exchange device is provided in a shape such that a backward flow is formed in the heat exchange tube and the housing cylinder.