JP2002022370A - Single end heat exchanger - Google Patents

Single end heat exchanger

Info

Publication number
JP2002022370A
JP2002022370A JP2000208469A JP2000208469A JP2002022370A JP 2002022370 A JP2002022370 A JP 2002022370A JP 2000208469 A JP2000208469 A JP 2000208469A JP 2000208469 A JP2000208469 A JP 2000208469A JP 2002022370 A JP2002022370 A JP 2002022370A
Authority
JP
Japan
Prior art keywords
heat exchanger
outer tube
single
inner
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000208469A
Other languages
Japanese (ja)
Inventor
Masahiro Ando
正博 安藤
Original Assignee
Toshiba Ceramics Co Ltd
東芝セラミックス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Ceramics Co Ltd, 東芝セラミックス株式会社 filed Critical Toshiba Ceramics Co Ltd
Priority to JP2000208469A priority Critical patent/JP2002022370A/en
Publication of JP2002022370A publication Critical patent/JP2002022370A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a single end heat exchanger in which durability and heat exchanging rate can be enhanced. SOLUTION: The single end heat exchanger comprises a ceramic inner tube 3 being supplied with fluid to be heated from the base end part, and a ceramic outer tube 5 having forward end part closed by a hollow hemispherical closing part 5a in order to deliver the fluid to be heated from the base end part wherein a recess 5b and a protrusion 5c are provided in parallel with a generating line on the inner circumferential surface of the outer tube while corrugating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ceramic single-ended heat exchanger.

[0002]

2. Description of the Related Art Single-end heat exchangers are used for heat recovery from waste gas in order to preheat combustion air of a boiler. Conventionally, for example, as shown in FIGS. An inner tube 32 through which the fluid to be heated flows in through an inlet 31 at the base end (the right end in FIG. 5), the inner tube 32 is concentrically surrounded by the inner tube 32, and the heated fluid flows through the base end. Exit 3
The outer tube 34 has a ceramic outer tube 34 whose front end (the left end in FIG. 5) is closed by a hollow hemispherical closing portion 34a so as to flow out of the tube 3. In this single-ended heat exchanger, the fluid flowing in from the inlet 31 reaches the distal end through the inner pipe 32, and then the inner pipe 32 and the outer pipe 3
4 and flows out of the outlet 33.
During this time, the fluid is warmed by heat transfer by the inner tube 32 and heat transfer by the outer tube 34 heated by radiant heat from the outer tube 34 heated by an appropriate heat source, and heat exchange is performed. As the ceramic forming the outer tube 34, SiC or Si 3 N 4 is used.
SiC ceramics having high thermal conductivity such as impregnated SiC and sintered SiC and having excellent corrosion resistance are used.

[0003]

However, in the conventional single-ended heat exchanger, there is a problem that, in normal use, the temperature near the tip of the outer tube becomes the highest, so that a hole is formed near the tip. . In particular, when used at high temperatures in a corrosive gas atmosphere, even if the outer tube is formed of a SiC ceramic having high thermal conductivity and corrosion resistance, if the temperature of the outer tube becomes 1200 ° C. or more, the corrosive gas The erosion caused by the water rapidly progressed, and the holes became clear.

In order to meet the demand for an improvement in the heat exchange rate, it is conceivable to increase the inflow amount of the fluid or increase the length of the heat exchanger. It may be difficult to increase the length. In order to cope with such a problem, it is conceivable to provide fins 35 in a spiral shape on the outer peripheral surface of the inner tube 32 as shown in FIGS. 7 and 8 like a radiant tube burner described in Japanese Utility Model Publication No. 52-50442. ing. This single-ended heat exchanger has a larger heat transfer area on the outer peripheral surface of the inner tube 32 and a larger fin 3 than the one shown in FIGS.
Since 5 is provided in a spiral shape, the amount of heat transfer from the inner tube 32 to the fluid passing between the inner tube 32 and the outer tube 34 increases, and the heat exchange rate is high. On the other hand, since the amount of radiant heat transfer from the outer tube 34 to the inner tube 32 also increases, the temperature of the fluid passing through the inner tube 32 also increases early, and as a result, the temperature near the tip of the outer tube 34 increases, and There is a problem that a hole is made in the vicinity.

[0005] Therefore, the present invention is to improve the durability, and
It is an object of the present invention to provide a single-ended heat exchanger capable of increasing a heat exchange rate.

[0006]

In order to solve the above-mentioned problems, a first single-ended heat exchanger according to the present invention comprises an inner pipe through which a fluid to be heated flows from a base end and a concentric inner pipe. And a ceramic outer tube whose distal end is closed by a hollow hemispherical closure to allow the fluid to be heated to flow out of the proximal end.
A concave portion and a convex portion parallel to the generatrix are provided on the inner peripheral surface of the outer tube so as to form a waveform in the circumferential direction. Further, the second single-ended heat exchanger is characterized in that, in the first device, a substantially conical projection is provided at the center of the inner surface of the closing portion.

In the first single-ended heat exchanger, the heat transfer area of the inner peripheral surface of the outer tube increases, but the area of the inner peripheral surface of the outer tube parallel to the outer peripheral surface of the inner tube decreases.
Further, in the second single-ended heat exchanger, the heat transfer area of the inner surface of the closed part increases in addition to the action of the first one.

It is preferable to use a material having a low thermal conductivity as a material for forming the inner tube. Further, as the ceramic forming the outer tube, it is preferable to use a SiC ceramic having high thermal conductivity.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are a half sectional vertical sectional view showing a first embodiment of a single-ended heat exchanger according to the present invention, and a sectional view taken along line II-II in FIG. The single-ended heat exchanger 1 is composed of an inner pipe 3 into which a fluid to be heated flows from an inlet 2 at a base end (right end in FIG. 1) and Si-impregnated SiC. An outer tube 5 that surrounds and has a distal end (the left end in FIG. 1) closed by a hollow hemispherical closed portion 5a so that the fluid to be heated flows out of the outlet 4 at the base end. On the inner peripheral surface of the outer tube 5, a concave portion 5b and a convex portion 5c parallel to the generatrix are provided so as to form a waveform in the circumferential direction.

In the single-end heat exchanger 1 having the above-described structure, the fluid flowing from the inlet 2 passes through the inner pipe 3 and reaches the distal end, and then passes between the inner pipe 3 and the outer pipe 5. The fluid is discharged from the outlet port 4 during this time, and the fluid is transferred by the heat transfer by the inner pipe 3 and the heat transfer by the outer pipe 5 heated by the radiant heat from the outer pipe 5 heated by an appropriate heat source. Heat exchange is performed by sequentially heating the inside of the tube 3 and between the inner tube 3 and the outer tube 5. However, since the heat transfer area of the inner peripheral surface of the outer tube 5 increases, the inner tube 3 and the outer tube 5 are heated. While the amount of heat transfer to the fluid passing between the two can be increased, the area of the inner peripheral surface of the outer tube 5 parallel to the outer peripheral surface of the inner tube 3 decreases, so that the heat transfer lowers the temperature of the outer tube 5. In addition, the amount of radiant heat transferred from the outer tube 5 to the inner tube 3 is reduced, and the heat passes through the inner tube 3. Temperature rise of the body is prevented, thereby preventing the temperature rise in the vicinity of the distal end portion of the outer tube. Further, the outer tube 5 can be easily manufactured by CIP or cast molding. As a result, the heat exchange rate can be increased, the durability of the outer tube 5 can be increased, and the manufacturability can be improved.

FIGS. 3 and 4 are half sectional views showing a second embodiment of the single-ended heat exchanger according to the present invention.
FIG. 4 is a sectional view taken along line IV-IV in FIG. The single-ended heat exchanger 1 'has a substantially conical projection 5d at the center of the inner surface of the closing portion 5a of the outer tube 5.
The other configuration is the same as that of the first embodiment, so that the same components and the like are denoted by the same reference numerals and description thereof is omitted.

In the single-ended heat exchanger 1 'having the above structure, the same operation and effect as those of the single-ended heat exchanger 1 of the first embodiment can be obtained. Since the transmission area increases, the temperature rise at the tip of the outer tube 5 can be suppressed, and the durability can be further improved.

Here, the inner tube has an outer diameter of 50 mm and a length of 155.
FIGS. 1 and 2 (invention 1), FIGS. 3 and 4 (invention 2), and FIG. 5 show single-ended heat exchangers having an outer tube having an outer diameter of 90 mm and a length of 1600 mm. , FIG. 6 (conventional product 1) and FIGS. 7 and 8 (conventional product 2), and these are placed in a furnace at a temperature of 1350 ° C., and a temperature of 500 ° C. 60Nm 3 /
In FIG. 1, A (center of the outer surface of the outer tube closing portion), B (45 mm in the axial direction from A), C (150 mm in the axial direction from A), and D (4 in the axial direction from A) in FIG.
The temperature of each point on the outer surface of the outer tube (at a distance of 50 mm) and the temperature of the air at the outlet were measured, and the results are as shown in Table 1.

[0014]

[Table 1]

As can be seen from Table 1, in the products 1 and 2 of the present invention, the temperature near the tip of the outer tube can be lowered and the heat exchange rate can be increased.

[0016]

As described above, according to the first single-ended heat exchanger of the present invention, since the heat transfer area of the inner peripheral surface of the outer tube is increased, the fluid passing between the inner tube and the outer tube is increased. On the other hand, while the amount of heat transfer to the outer tube can be increased, the area of the inner surface of the outer tube parallel to the outer surface of the inner tube decreases, so that the heat transfer reduces the temperature of the outer tube, The amount of radiant heat transfer from the outer tube to the inner tube is reduced, the temperature of the fluid passing through the inner tube is prevented from rising, and the temperature near the distal end of the outer tube can be prevented. Further, the outer tube can be easily manufactured by CIP or cast molding. As a result, the heat exchange rate can be increased, the durability can be increased, and the manufacturability can be increased.

According to the second single-ended heat exchanger, the same operation and effect as those of the first one can be obtained, and the heat transfer area of the inner surface of the closed portion in the outer tube increases. The temperature rise of the part can be suppressed, and the durability can be further improved.

[Brief description of the drawings]

FIG. 1 is a half sectional vertical sectional view showing a first embodiment of a single-ended heat exchanger according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a half sectional vertical sectional view showing a second embodiment of the single-ended heat exchanger according to the present invention.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a half sectional vertical sectional view of a conventional single-ended heat exchanger.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a half sectional vertical sectional view of another conventional single-ended heat exchanger.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7;

[Explanation of symbols]

 2 Inlet 3 Inner tube 4 Outlet 5 Outer tube 5a Closed part 5b Concave part 5c Convex part 5d Projection

Claims (2)

[Claims]
1. An inner tube through which a fluid to be heated flows in from a base end, and a hollow hemispherical tip which surrounds the inner tube concentrically and has a distal end in order to flow out the fluid to be heated from the base end. In a single-ended heat exchanger having a ceramic outer tube closed by a closing portion, a concave portion and a convex portion parallel to the generating line are provided on the inner peripheral surface of the outer tube so as to be corrugated in the circumferential direction. A single-ended heat exchanger.
2. The single-ended heat exchanger according to claim 1, wherein a substantially conical protruding portion is provided at a central portion of an inner surface of the closing portion.
JP2000208469A 2000-07-10 2000-07-10 Single end heat exchanger Pending JP2002022370A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000208469A JP2002022370A (en) 2000-07-10 2000-07-10 Single end heat exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000208469A JP2002022370A (en) 2000-07-10 2000-07-10 Single end heat exchanger

Publications (1)

Publication Number Publication Date
JP2002022370A true JP2002022370A (en) 2002-01-23

Family

ID=18705040

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000208469A Pending JP2002022370A (en) 2000-07-10 2000-07-10 Single end heat exchanger

Country Status (1)

Country Link
JP (1) JP2002022370A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010503824A (en) * 2006-09-18 2010-02-04 ストーム ディヴェロップメント エルエルシー Radiant heat transfer system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010503824A (en) * 2006-09-18 2010-02-04 ストーム ディヴェロップメント エルエルシー Radiant heat transfer system

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