JPH08629Y2 - Dust remover for plate heat exchanger - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used for recovering waste heat, and more particularly to a dust remover for a plate heat exchanger having heat exchange plates arranged side by side in an exhaust gas passage.

[0002]

2. Description of the Related Art For example, in waste incineration facilities, chemical plants, etc., the high temperature exhaust gas is not directly discharged into the atmosphere but is heat-exchanged with the combustion air to raise the temperature of the combustion air to a high temperature to incinerate the waste. It is known that the required fuel can be saved and the burning time can be shortened. It is also known to prevent white smoke by supplying heated air into the exhaust gas discharged into the atmosphere.

Therefore, a heat exchanger for exchanging heat between the exhaust gas and the air is provided in the exhaust gas passage, but most of the heat exchangers currently used are of the multi-tube type, and dust inside the tube. There is a problem that the heat exchange efficiency as designed will not be obtained and the desired temperature will not be reached, and dust adhering to the inside of the pipe will be cleaned with compressed air (soot blow).
However, due to the long length of the pipe, it can hardly be removed.Therefore, the operation of the equipment is stopped, the temperature is lowered, and the cleaning is done manually, which leads to work in a poor environment. In addition, there is a problem that the pipe is corroded quickly due to the accumulation of dust, and the pipe is punctured in a short period of time.

On the other hand, a plate-type heat exchanger in which heat exchange plates are arranged in parallel in the exhaust gas passage is also known, but even in that case, when the exhaust gas contains dust, the dust of the heat exchange plate is used. There is a problem that it adheres to the surface and hinders the heat exchange action, and also blocks the exhaust gas passage to increase the pressure loss, making continuous operation impossible.

In the conventional method of removing dust in this plate heat exchanger, a method of intermittently blowing off with a soot blower or washing away with water was carried out, but it is possible to remove dust reliably and efficiently. There was a problem that I could not.

Therefore, for example, in Japanese Utility Model Publication No. 2-29439, the linear blow-off member in contact with the wall surface of the heat exchange plate is reciprocally moved to remove dust adhering to the wall surface, which is mechanically ensured. It has been proposed to remove dust.

Further, the applicant of the present invention previously found that the utility model of Kaikaihei 3-7909.
In Japanese Patent Laid-Open No. 1-58, there is provided an elongated dust scraper loosely fitted in a space between the heat exchange plates and penetrating the space, and a moving means for reciprocating the dust scraper in a direction orthogonal to its longitudinal direction. As a specific example of the moving means, rocking arms that can rock in the moving direction of the dust scraper and have a support shaft fixed to the tip are arranged above and below the heat exchange plate, and both ends of the dust scraper are placed between the upper and lower support shafts. It has been proposed to provide a driving means for swinging and driving the swinging arm.

[0008]

By the way, in the case where the dust scraper is reciprocally moved along the wall surface of the heat exchange plate as described above, the attached dust in the reciprocating movement range of the dust scraper is surely removed. However, a part of the scraped dust is scraped to both ends of the reciprocating movement range of the dust scraper and is gradually deposited on both ends of the heat exchange plate, hindering the smooth operation of the dust scraper. There is a risk that it may be damaged or damaged, the operation of the equipment must be stopped regularly to remove the accumulated dust, or a means for removing accumulated dust must be additionally provided. There is a problem that the structure of the dust removing device becomes complicated and the cost increases.

In view of the above conventional problems, the present invention proposes a dust removing device capable of reliably removing dust by reciprocating movement of a dust scraper and preventing accumulation of dust at the reciprocating movement end with a simple structure. The purpose is to

[0010]

In order to achieve the above-mentioned object, the present invention shows each heat exchange of a plate type heat exchanger according to claim 1 if it is shown with reference numerals in the drawings. An elongated dust scraper 11 which is loosely fitted in the space between the working plates 5 and 5 and penetrates through the space, and a moving means 12 for reciprocating the dust scraper 11 in a direction orthogonal to the longitudinal direction thereof. Are swing arms 20a and 20b that are swingable in the moving direction of the dust scraper 11 and have the tip of the dust scraper 11 connected thereto, and drive means 28 that swings the swing arm in a swing range of 180 ° or more. And the projections 15 are provided on the side facing the moving direction of the dust scraper 11 at appropriate intervals in the longitudinal direction.

In the second aspect of the present invention, the dust scraper 11 has a scraping portion 14 having a V-shaped cross-section with its both side edges being close to the surface of the heat exchanging plate 5 on both sides and an appropriate gap in the longitudinal direction. In addition, the scraping portion is provided with a projecting plate 15 which is provided so as to project substantially vertically, and the configuration according to claim 1 is adopted.

[0012]

In the first aspect of the present invention, the dust scraper 11 reciprocates in the space between the heat exchange plates 5 and 5 to scrape off the dust adhering to the wall surface of the heat exchange plate 5. Can be removed and swing arm 20a,
20b is swung 180 ° or more to remove dust scraper 11
Since the dust scraper 11 is reciprocatingly moved, the dust scraper 11 largely moves in the longitudinal direction at both ends of the reciprocating movement range, and the dust scraped by the dust scraper 11 to both ends of the reciprocating movement range of the dust scraper 11 accordingly. It can be scraped off by the projecting portion 15 provided on the side portion, and dust can be prevented from accumulating at the reciprocating end of the dust scraper 11.

In the second aspect, the dust scraper 1
Since 1 has a scraping portion 14 having a V-shaped cross section, dust adhering to the wall surface of the heat exchange plate 5 can be reliably removed by scraping it off, and the scraping portion 1
By projecting the projecting plate 15 substantially perpendicularly to 4, the projecting portion can be easily provided, and the projecting portion can be easily fitted to the side end shape of the heat exchange plate 5, so that almost no dust is accumulated. There can be nothing.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the dust remover for a plate heat exchanger according to the present invention will be described below with reference to FIGS.

In FIGS. 1, 2 and 3, reference numeral 1 is a heat exchanger main body in the shape of a rectangular tube having an exhaust gas inlet 2 at the upper end and an exhaust gas outlet 3 at the lower end. A plurality of heat exchange plates 5 are provided in the exhaust gas passage 4 inside the heat exchanger body 1.
Are arranged in parallel in parallel with the exhaust gas flow direction at regular intervals to form a heat exchange plate group 6. Reference numeral 7 is an air inlet connected to the lower part of one end of the heat exchange plate group 6, 8 is an air outlet connected to the upper end of the other end of the heat exchange plate group 6, and the air supplied to the air inlet 7 is for each heat exchange. It flows in the plate 5 in a direction intersecting with the exhaust gas flow in the exhaust gas passage 4, and is discharged from the air outlet 8.

Such a plate heat exchanger is well known in the art, and low-temperature air flowing from the right side to the left side of FIG. 1 inside the heat exchange plate 5 and the outside of the heat exchange plate 5 from above. The heat of the exhaust gas is extracted in the form of high-temperature air by exchanging heat with the high-temperature exhaust gas flowing below.

Reference numeral 10 denotes a dust removing device incorporated in such a plate heat exchanger, which is an elongated dust which is loosely fitted in the space between the heat exchange plates 5 and 5 and vertically penetrates the space. It comprises a scraper 11 and a moving means 12 for reciprocating the dust scraper 11 along the heat exchange plate 5 in a direction orthogonal to the longitudinal direction thereof.

The dust scraper 11 is shown in FIGS.
As shown in detail in FIG. 2, two slender plate-like materials 13 each having both side edges bent and formed in a trapezoidal shape in cross section are combined, and a scraping portion 14 having a substantially V-shaped cross section is formed on both sides. Has been done. The width between the tips of the scraping portions 14 is set to be slightly smaller than the width of the space between the heat exchange plates 5 and 5, and the dust scraper 11 uses the heat exchange plate 5 and
It is loosely fitted in the space between the five. Further, projecting plates 15 are fixed to the scraping portion 14 at appropriate intervals in the longitudinal direction thereof and substantially perpendicular to the plate surface.

A support member 16 is provided between the heat exchange plates 5 and 5 at the center position in the horizontal direction of the heat exchange plate group 6.
The space between the heat exchange plates 5 and 5 is divided into left and right parts, and a pair of heat exchange plates 1 penetrates the heat exchanger body 1 in the parallel direction above the center position of each space. The rotating shafts 17a and 17b are provided. Airtight bearings 18 are provided in the heat exchanger main body 1 penetrating portions of the rotating shafts 17 a and 17 b, and both ends thereof are rotatably supported by bearings 19.

The rotating shafts 17a, 17b are provided with a pair of swing arms 20a, 20 near both ends in the heat exchanger body 1, respectively.
b is fixed, and support shafts 21a and 21b extending in the parallel direction of the heat exchange plate 5 are fixed to their tip ends. The support shafts 21a and 21b are rotatably and axially movably fitted into holes 11a provided at the upper end of the dust scraper 11.
It is supported by a and 21b.

The rotary shaft 22 is located at a position below the heat exchange plate group 6 just below both ends of the pair of rotary shafts 17a and 17b.
a, 22b, 23a, and 23b are provided, an airtight bearing 24 is provided at a penetrating portion of the heat exchanger body 1, and an end portion thereof is rotatably supported by a bearing 25. Rotating shaft 22
A pair of swing arms 26a and 26b are fixed to the end portions of the heat exchanger body 1 of a, 22b and 23a and 23b, respectively. A support shaft 27a extending in the parallel direction of the heat exchange plate 5 is provided at the tip of the swing arms 26a and 26b.
27b is fixed, and each of the support shafts 27a, 27b is fitted in a long hole 11b provided at the lower end of the dust scraper 11 so as to be rotatable and movable in the axial and vertical directions. In addition,
The swing arms 20a, 20b, 26a, 26b are of equal length and are arranged in parallel in the same direction.

Swing arms 20a, 20b and 26a,
The drive means 28 of 26b is adapted to rotate the rotating shafts 17a, 17b, 22.
a, 22b, four drive levers 29 fixed to the respective outer ends thereof, a connecting frame 30 in which the tip end of each drive lever 29 is connected to four corners to form a parallel link mechanism, and fixed to the rotary shaft 17a. Sprocket 31, drive motor 32 with a speed reducer capable of forward and reverse rotation control, sprocket 32 fixed to its output shaft, sprocket 30 and 32
The drive motor 32 is configured to be alternately inverted by actuating the limit switches 35a and 35b arranged at the swinging end of the drive lever 29. In these limit switches 35a and 35b, the drive lever 29, that is, the swing arms 20a and 20b, and 26a and 26b are substantially two.
It is arranged so as to swing back and forth within a range of 20 °. Three
Reference numerals 6a and 36b are safety limit switches for detecting when the drive lever 29 rotates beyond a set range and for emergency stop the drive motor 32.

Dust removing device 1 constructed as described above
At 0, when the rotary shaft 17a is reciprocally rotated by the drive motor 32 via the sprocket 33, the chain 34, and the sprocket 31, the rotary shafts 17a, 17b, 22a,
The drive lever 29 fixed to 22b swings in conjunction with each other via the connecting frame 30, so that the rotary shafts 17a, 17b, 2
Swing arm 2 in heat exchanger body 1 via 2a and 22b
0a, 20b, 26a, 26b swing, and the upper support shaft 2
1a, 21b and the lower support shafts 27a, 27b swing in synchronization with each other, and these support shafts 21a, 21b, 27a, 2
The dust scraper 11 whose upper and lower ends are supported by 7b reciprocates along the wall surface of each heat exchange plate 5 over substantially the entire width thereof. At that time, the upper and lower ends of the dust scraper 11 are supported rotatably and axially movably with respect to the support shafts 21a, 21b and 27a, 27b.
Since the dust scraper 11 is not fixed, there is no risk that the dust scraper 11 will come into strong contact with a part of the wall surface of the dust scraper 11 while it moves between the heat exchange plates 5 and 5 to be worn. Further, since the swing angle range of the swing arms 20a, 20b, 26a, 26b is set to about 220 °, the swing range of about 20 ° vertically with respect to the horizontal center line, that is, FIG.
In the range W shown in (b), the dust scraper 11 moves largely in the vertical direction as compared with the amount of left and right movement.

Therefore, when the drive motor 32 is operated for a predetermined time every set time during the operation of the equipment using the plate heat exchanger, the dust scraper 11 causes the heat exchanging plates 5 and 5 to perform a predetermined operation. The reciprocating movement is repeated a number of times, and the dust adhering to the wall surface of the heat exchange plate 5 is scraped off by the scraping portion 14 having a substantially V-shaped cross section, and is reliably removed. At both ends of the reciprocating range of the dust scraper 11, the dust scraped to both ends of the reciprocating range of the dust scraper 11 as the dust scraper 11 largely moves up and down, the protrusion plate 15 is formed.
The dust scraper 11 is scraped off, and dust is prevented from accumulating at the reciprocating end of the dust scraper 11.

In the dust scraper 11 of the illustrated example, an example is shown in which the triangular protruding plate 15 that can be accommodated in the space inside the scraping portion 14 is provided, but as shown in FIG. Projecting plates 37, 38 having a shape matching the cross-sectional shape of the side end and the cross-sectional shape of the support member 16.
May be provided. In that case, almost no dust can be accumulated on the side end portion of the heat exchange plate 5.

In the above embodiment, the dust scraper 11 is made of the plate material 13 and has the scraping portion 14 having a substantially V-shaped cross section, but the material, shape, etc. are the specifications of the heat exchanger. The optimum one may be designed according to the above.

Further, in the above embodiment, the heat exchange plate group 6
An example in which the space between the heat exchange plates 5 and 5 is divided into left and right and a dust scraper 11 is arranged in each space is shown. When the width of the plate group 6 is narrow, it may be a single space, and when it is wide, it may be divided into three or more spaces.

Further, in the above embodiment, an example of exchanging heat between exhaust gas and air is shown, but it goes without saying that the present invention can be applied as it is to exchanging heat between a high temperature gas containing dust and an arbitrary gas. Even if the present invention is applied to a heat exchange device for a high temperature gas and a liquid, the same effect can be exhibited.

[0029]

According to claim 1 of the present invention, the dust scraper can reciprocate in the space between the heat exchange plates to remove dust adhering to the wall surfaces of the heat exchange plates, and the swing arm. Since the dust scraper is reciprocally moved by swinging by 180 ° or more, the dust scraper greatly moves in the longitudinal direction at both ends of the reciprocating range of movement, and is scraped to both ends of the reciprocating range of the dust scraper accordingly. The dust can be scraped off by the protrusion provided on the side of the dust scraper, and the swing arm can be swung by 180 ° or more, and the dust scraper is provided with the protrusion with an extremely simple structure. It is possible to prevent the accumulation of dust at the reciprocating end of the dust scraper at low cost and without stopping the operation of the equipment.

According to the second aspect, since the dust scraper has the scraping portion having a V-shaped cross section, the dust adhering to the wall surface of the heat exchange plate can be reliably removed by scraping it off. Moreover, the protruding portion can be easily provided by the protruding plate protruding substantially vertically to the scraping portion,
In addition, the protrusion can be easily fitted to the shape of the side end of the heat exchange plate, and dust can be hardly accumulated.

[Brief description of drawings]

FIG. 1 is a partially longitudinal front view of a plate heat exchanger according to an embodiment of the present invention.

FIG. 2 is a partially longitudinal side view of the embodiment.

FIG. 3 is a front view of the embodiment.

FIG. 4 shows a detailed configuration of a main part of the embodiment, (a) is a cross-sectional plan view, and (b) is a view taken along the line AA of (a).

FIG. 5 is an enlarged transverse plan view of the dust scraper of the same embodiment.

FIG. 6 is an enlarged transverse plan view showing another configuration example of the dust scraper of the same embodiment.

[Explanation of symbols]

 1 Heat Exchanger Main Body 5 Heat Exchange Plate 10 Dust Removal Device 11 Dust Scraper 12 Moving Means 14 Scraping Part 15 Projecting Plate 17a Rotating Shaft 17b Rotating Shaft 20a Swinging Arm 20b Swinging Arm 28 Driving Means 37 Projecting Plate 38 Projecting Plate

Claims (2)

[Scope of utility model registration request] 1. An elongated dust scraper that is loosely fitted in a space between heat exchange plates of a plate heat exchanger and penetrates through the space, and a movement that reciprocates the dust scraper in a direction orthogonal to its longitudinal direction. And a driving means for swinging the swinging arm in a swinging range of 180 ° or more, the swinging arm being swingable in the moving direction of the dust scraper and having a dust scraper connected to the tip thereof. A dust removing device for a plate heat exchanger, characterized in that projecting portions are provided at appropriate intervals in the longitudinal direction on the side portion facing the moving direction of the dust scraper. 2. The dust scraper has a V-shaped scraping portion having lateral cross-sections whose both edges are close to the surfaces of the heat exchanging plates on both sides, and the dust scraper protruding substantially perpendicularly to the scraping portion at appropriate intervals in the longitudinal direction. 2. The dust removing device for a plate heat exchanger according to claim 1, further comprising: a protruding plate.