JPS60188794A - Separate type heat exchanger - Google Patents

Abstract

PURPOSE:To keep high heat transfer rate even through the operating liquid in an evaporating tube is somewhat fluctuated in accordance with an evaporating condition by arranging the evaporating pipes of an evaporating section horizontally. CONSTITUTION:The evaporating section A, heated by heating fluid such as exhaust gas, discharging water or the like, is constituted of a plurality of evaporating tubes 1 arranged horizontally, a vapor header 2 attached to one ends of the evaporating tubes 1, a condensed liquid header tube 3 attached to the other ends of the same and a reverse flow preventing wall for vapor produced at the condensed liquid header tube 3 side of the evaporating tubes 1. On the other hand, a condensing section B, cooled by fluid to be heated, is constituted of a plurality of condensing tubes 4 arranged above the evaporating section A, the vapor header tube 5 attached to the upper ends of the condensing tubes 4 and the condensed liquid header tube 6 attached to the lower ends of the same. Both of the vapor header tubes 2, 5 of the evaporating section A and the condensing section B are connected by a vapor pipe 7 while both of the condensed liquid header tubes 3, 6 are connected by a condensed liquid pipe 8 to form a circulating circuit. The operating liquid, evaporating in the evaporating section A and condensing in the condensing section B, is sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separate type heat exchange device that applies the principle of a heat pipe, and is particularly designed to remove dust that accumulates on the outer surface of the evaporation tube that is located in the evaporation section. This makes it easier to conduct heat transfer and improves the heat transfer coefficient.

Generally, heat pipes with excellent heat transfer coefficient are used for the apparent recovery of factory exhaust gas and wastewater, etc., and are usually installed by penetrating a partition plate between the heated fluid such as exhaust gas or wastewater and the heated fluid. There is. Therefore, the structure of the partition plate had to be devised, leakage from the heated fluid side to the heated fluid side could not be avoided, and it was extremely difficult to replace a damaged heat pipe. Also, depending on the type and conditions of the heating fluid or fluid to be heated, the evaporating part and condensing part of the heat pipe may be separated from each other.
It will be necessary to place it in a certain position. However, when the length of the heat pipe is increased, since gravity is used to return the condensed working fluid to the evaporator, steam and condensed fluid flow together, creating resistance to the flow of steam.

To improve this, a separate heat exchanger device that applies the heat pipe principle has been developed and put into practical use. As shown in Figure 1, this device has multiple evaporator tubes (1) arranged vertically, a steam header tube (2) attached to the upper end, and a condensate header tube (3) attached to the lower end. (A) and a plurality of condensing pipes (4) above the evaporation section (A).
is arranged vertically, a steam header pipe (5) is attached to its upper end, a condensate header pipe (6) is attached to its lower end to form a condensing section (B), and both steam header pipes (2), (5) are arranged vertically. are connected by a steam pipe (7), and both condensate header pipes (3) and (6
) are connected by a condensate pipe (8) to form a circulation circuit, and a working fluid that is evaporated in the evaporation section (A), condensed in the condensation section (B), and circulated is sealed inside.

This device usually has a plurality of units arranged in parallel and radial fins are attached to the surface of the vertical evaporation tube, so it not only tends to attract dust but also has the drawback that it is extremely difficult to remove. In addition, in the evaporator section, as shown in Figure 2, it is necessary to maintain the height 111 of the working liquid level in the evaporator tube (1) at an appropriate value. The height hl of the working liquid level in the condensate pipe (8) which naturally flowed down, and the height h of the working liquid level in the evaporation pipe (1)
1, it is very difficult to adjust the amount of working fluid, and even if it could be set to the appropriate value, it would not be possible to eliminate the dry surface on the inside of the evaporation tube, making it difficult to adjust the amount of working fluid to a single tube heat pipe (conventional type) The disadvantage was that the heat transfer coefficient was inferior.

In view of this, as a result of various studies, the present invention has developed a separate heat exchange device that allows easy adjustment of the working fluid, has a high heat transfer coefficient, and can easily remove dust attached to the outer surface of the evaporation tube. This is a newly developed system in which multiple evaporation pipes are installed horizontally between the steam header pipe and the condensate header pipe (=l) to form an evaporation section using heated fluid, and a steam header pipe and a steam header pipe are installed above the evaporation section. A condensation section is formed by installing a plurality of condensing pipes between the condensate header pipe and the heated fluid, and both steam header pipes are connected by a steam pipe, and both condensate header pipes are connected by a condensate pipe. A working fluid that forms a circulation circuit and circulates in the circuit by evaporating in the evaporating section and condensing in the condensing section @
It is characterized by being enclosed.

That is, the present invention uses a plurality of evaporation tubes (1) as shown in FIG.
horizontally, attach the steam header pipe (2) to one end, and the condensate header pipe (3) to the other end. Although not shown, a backflow prevention wall for generated steam is provided to form an evaporation section (A) using heated fluid such as exhaust gas or waste water. Also, the evaporation section (
A) Multiple condensing pipes (4) are arranged vertically or inclinedly (the figure shows a vertical case) above A), a steam header pipe (5) is attached to the upper end of the pipe, and a condensate header pipe is attached to the lower end of the condensing pipe (4). (6)
is attached to form a condensation section (B) by the fluid to be heated.

Both steam header pipes (
2) and (5) are connected by a steam pipe (7), and both condensate header pipes (3>, (6) are connected by a condensate pipe (8) to form a circulation circuit. It encloses a working fluid that evaporates in the condensing part (A), condenses in the condensing part (B), and circulates by flowing down naturally in the condensate pipe (8).

As described above, in the heat exchanger of the present invention, the evaporation tubes in the evaporation section are arranged horizontally, so although the working fluid in the evaporation tubes varies somewhat depending on the evaporation conditions, the working fluid is supplied over the entire length of the evaporation tubes. , the inner surface of the evaporator tube is always kept wet and exhibits a high heat transfer coefficient. Furthermore, even if radial fins are removed from the surface of the steam pipe, since the evaporation pipe is horizontal, there is little dust adhesion, and even if dust does accumulate, it can be easily removed by washing with water or using a shot cleaning system. .

Although we have described an example in which the evaporator pipe, steam header pipe, and condensate header pipe in the evaporation section are installed horizontally, the present invention is not limited to this. For example, as shown in the fourth factor, the steam header pipe (2) and The condensate header pipes (3) may be arranged vertically to face each other, and a plurality of evaporation pipes (1) may be installed horizontally between both header pipes (2), (3). In this case, as shown in Figure 5, a weir (9) is provided on the steam header pipe (2) side of each evaporator pipe (1), and an overflow pipe is provided for each evaporator pipe (1) in the condensate header pipe (3). (11) is installed to adjust the height of the working liquid level in the evaporation tube (1), and the evaporation tube (1) is attached to the end of the evaporation tube (1).
It is recommended to install a wall (12) to prevent backflow of steam from the

Examples of the heat exchange device of the present invention will be described below.

Made of material 5TB35, outer diameter 50.8mm, wall thickness 2,
An evaporation tube was created by attaching radial fins made of 5 pcc material with a thickness of 1.0 mm, a height of 12.7 mm, and a pitch of 5 mm to the outer periphery of a tube with a length of 1000 mm, and 5 of these were arranged horizontally as shown in Figure 4. An evaporation section of the present invention apparatus shown in FIG. 1 and an evaporation section of a conventional apparatus shown in FIG. 1 in which five evaporation tubes are arranged vertically were formed.

For these, add 50vol of water as a working fluid in the evaporation tube.
% to the evaporation section. OX103 KCa
t/m2h ~8. (lx103 Kcal/m21
The evaporative heat transfer coefficient was measured by adding a heat amount of 1. As a result, in the evaporation section of the device of the present invention, 1500 to 3000K Cal/
An evaporative heat transfer coefficient of m2b°C was obtained. In contrast, the evaporation heat transfer coefficient in the evaporation section of conventional equipment is 800 to 150.
0 KCal/m2h°C, and it can be seen that according to the apparatus of the present invention, the evaporation heat transfer coefficient to the evaporation section is significantly improved.

Furthermore, when exhaust gas was used to heat the evaporation section, the amount of dust attached to the evaporation section of the device of the present invention was about half or less of the amount of dust attached to the evaporation section of the conventional device. In the evaporation section of the device of the invention, it could be removed extremely easily by water washing and/or shot cleaning, which are inexpensive. On the other hand, in the evaporation section of the conventional device, it is impossible to remove dust by washing with water and/or shot cleaning, and it is difficult to remove dust even by using a soot blowing system, which requires high processing cost.

As described above, according to the present invention, it is easy to adjust the working fluid field in the evaporator tube, and the evaporative heat transfer coefficient is approximately twice as high as that of the evaporator section of conventional equipment. Even if it does, there are some that have remarkable industrial effects, such as being able to be easily removed.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a conventional separation type heat exchange device,
FIG. 2 is an enlarged cross-sectional view of the evaporation section of the device, FIG. 3 is an explanatory diagram showing an example of the separation type heat exchange device of the present invention, and FIG. 4 is a perspective view showing another example of the device of the present invention. , FIG. 5 is a partially cutaway cross-sectional view showing an enlarged @ colored part of the same device. A ...... Evaporation section B ...... Condensation section 1 ...... Evaporation pipe 2.5 ... Steam header pipe 3.6 ...・ Condensate header pipe 4 ...... Condensate pipe 7 ...... Steam pipe 8 ...... Condensate pipe 9 ...... ...Weir 10 ...... Closure plate 11 ...... Overflow pipe 12 ・
・・・・・・・・・ Steam backflow prevention wall Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) A plurality of evaporation pipes are installed horizontally between the steam header pipe and the condensate header pipe to form an evaporation section using heated fluid, and the steam header pipe and the condensate header pipe are connected above the evaporation section. A condensing section is formed by the heated fluid with multiple condensing pipes installed between them, both steam header pipes are connected by a steam pipe, and a rudder pipe is connected to both condensates by a condensate pipe to form a circulation circuit. A separate type heat exchange device, characterized in that a working fluid that circulates by evaporating in an evaporating section and condensing in a condensing section is sealed in the circuit. (2) A patent that maintains the amount of working fluid in the evaporator tubes at an appropriate level by providing a weir on the steam header side of the evaporator tubes arranged vertically and installing a -C blocking plate in the condensate header tube through the overflow tube. A separate heat exchange device according to claim 1.