JPH08296834A - Cleaning apparatus for matter adhering to heat exchanger tube - Google Patents

Abstract

PURPOSE: To clean matter adhering to the external surface of a heat exchanger tube efficiently and moreover, without scattering dust. CONSTITUTION: A jetting device 5 comprising a blast nozzle 1 for jetting a blast material, a hood 2 and a scattering prevention brush 3 and a recovery device 6 comprising a recovery nozzle 4 for recovering a hard scale and the blast material peeled off a heat exchanger tube 7, the hood 2 and a scattering prevention brush 3 are installed on both sides of two heat exchanger tubes 7. This enables cleaning of a matter adhering to the external surface of the heat exchanger tube efficiently and moreover, without scattering dust.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer tube deposit cleaning device for cleaning a hard scale adhered to the outer surface of a heat transfer tube such as a horizontal superheater tube of a boiler by spraying a blasting material to pulverize and peel it off. .

Shielding box 43

[0003]

2. Description of the Related Art A conventional technique will be described with reference to the drawings. Figure 11
FIG. 3 is a perspective view showing a conventional cleaning device. The conventional technology is a cleaning device for a vertical heat transfer tube with a hanging structure,
A half-breaking shielding box 43 is placed by abutting the heat transfer tube 7 in between. The shield box 43 has a pair of blast nozzles 41 and a mechanism for moving the blast nozzles 41 vertically and horizontally, and the pair of blast nozzles 41 is reciprocally moved in the longitudinal direction while being fixed to the heat transfer tube 7. And, the blast material is sprayed perpendicularly to the heat transfer tube 7 while being slightly rotated.
The hard scale and the blast material crushed and separated from the outer surface of the heat transfer tube by the impact of the blast material are shielded by the shielding box 43.
Is sucked and collected by a blower (not shown) connected to the hose.

[0004]

According to the above-mentioned conventional technique, it is necessary to install the shielding boxes 43 by butting the heat transfer tubes 7 between them, and cleaning is performed by the intervals between the heat transfer tubes 7 and the metal deposits attached to the heat transfer tubes 7. There are restrictions on the parts that can be created.
Next, the cleaning ability of the blast material is determined by the amount of the blast material injected, the injection speed, and the injection range, which is the number of particles that collide with the object to be cleaned per unit time. In this conventional technique, the shielding box 43 having a limited size has only one
Since the pair of blast nozzles 41, the moving mechanism, and the like are incorporated, the size of the blast nozzle 41 is limited, the injection amount of the blast material cannot be increased, the cleaning capacity is small, and the cleaning time is long.

Further, regarding the discharge of the hard scale and the blast material that have been crushed and peeled from the outer surface of the heat transfer tube 7, since the blast material and the hard scale that have settled at the bottom of the shielding box 43 are sucked and discharged, the cleaning target is Due to the limitation of the mounting direction of the shielding box 43, that is, it is limited to only the hanging type heat transfer tube, and further, when the cleaning position is moved to clean the other part of the heat transfer tube 7, the inside of the shielding box 43 should be purged. After performing the heat transfer tube 7 with the shielding box 43 cleaned
It is necessary to remove it and move it and install it in another place. In order to clean the entire length of the heat transfer tube, installation and disassembly are repeated and continuous cleaning in the axial direction of the heat transfer tube is not possible.

An object of the present invention is to solve the above-mentioned problems and to efficiently remove the deposits adhering to the outer surface of the heat transfer tube without scattering dust.

[0007]

The above object is to provide a first nozzle for injecting a blast material into a gap between a heat transfer tube and a heat transfer tube in which a hard deposit adheres to the outer surface, and a first nozzle facing the first nozzle. Second nozzle for sucking the hard adhered matter separated from the sprayed blast material, and holding the first nozzle and the second nozzle between the heat transfer tube and the heat transfer tube It is achieved by having means.

The above object is to provide a first nozzle for injecting a blast material into a gap between the heat transfer tube and a heat transfer tube in which hard deposits arranged in parallel in a furnace at equal intervals adhere to the outer surface, and a first nozzle. The first that is attached to the nozzle and opens in the injection direction of the blast material
And a blast material spraying means, which is composed of a hood and a brush, one of which covers the first hood opening and is installed in the blasting material spraying direction, and a blasting material which is disposed so as to face the first nozzle and is sprayed. The second which sucks the hard adhered matter that has peeled off
And a blast material recovery means that is attached to the second nozzle and has a second hood that is attached to the second nozzle and opens in the direction of the heat transfer tube, and the other end of the brush covers the opening. .

The above object is to provide a first nozzle for injecting a blast material into a gap between the heat transfer tube and the heat transfer tube, in which hard deposits arranged in parallel in the furnace at equal intervals are attached to the outer surface, and the first nozzle.
Blast material injection means comprising a first hood attached to the nozzle of the above and opening in the injection direction of the blast material, and a brush one of which covers the opening of the first hood and is attached in the injection direction of the blast material. And a second nozzle that is arranged to face the first nozzle and that sucks the hard adhered matter that has separated from the sprayed blast material, and the second nozzle that is attached to the second nozzle. A blast material collecting means having a second hood that is open to the other end of the brush and covers the opening portion, the blast material ejecting means and the blast material collecting means, and This is achieved by including a moving unit that moves in the axial direction and moves in the direction orthogonal to the axial direction at the end of the heat transfer tube.

It is desirable that the portion of the brush that comes into contact with the heat transfer tube be cut out according to the shape of the heat transfer tube.

[0011]

In the prior art, the shielding box is used to prevent the scattering of dust generated during cleaning, but the structure is not suitable for continuous movement, which hinders the cleaning efficiency.
The present invention is a configuration that prevents dust scattering and allows movement without using a shielding box, that is, injects a blast material in the middle of parallel heat transfer tubes to suck and suppress scattering to a minimum. The flow path of the blast material is blocked by using it to prevent the separated scale and blast material from scattering to the outside, the brush slides on the heat transfer tube, and the blast material injection means and the blast material recovery means are moved by the moving means. It can be cleaned efficiently by moving it in the axial direction of the heat transfer tube. Further, by injecting the blast material at a position displaced from the axial center line of the heat transfer tube, the blast material that collides with the heat transfer tube is dispersed, and local wear and cutting of the heat transfer tube can be prevented.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.
First, the basic configuration of this embodiment will be described. FIG. 1 is a vertical sectional view showing the configuration of an embodiment of the present invention. As shown in the figure, 1 is a blast nozzle, 2 is a hood, 3 is a scattering prevention brush, 4 is a recovery nozzle, 5 is an injection device, 6 is a recovery device,
7 is a heat transfer tube. On each side of the two heat transfer tubes 7,
An injection device 5 including a blast nozzle 1 for injecting a blast material, a hood 2, and an anti-scattering brush 3, a recovery nozzle 4 for recovering the hard scale and blast material separated from the heat transfer tube 7, a hood 2, and an anti-scattering brush 3. The recovery device 6 is installed. Since the injection device 5 and the recovery device 6 are not fixed to the heat transfer tube 7, they can be moved in the axial direction of the heat transfer tube 7 in the installed state.

In this state, the blast material is jetted from the blast nozzle 1 to collide with the outer surface of the heat transfer tube 7. Due to the impact of the blast material that has collided, the hard scale adhered to the outer surface of the heat transfer tube 7 is crushed and separated. The peeled hard scale and the blast material are sucked by the recovery nozzle 4 mounted on the recovery device 6 installed at a position facing the injection device 5, and discharged to the outside of the furnace.

By installing the recovery device 6 at a position facing the injection device 5, a strong and large air flow is formed between the injection device 5 and the recovery device 6, and the dust generated by the cleaning is scattered to the outside of the device. Can be cleaned without having to

FIG. 2 is a table showing a particle number distribution in a general blast material injection. Next, as described above, the cleaning ability of the blast material is proportional to the number of particles colliding with the object per unit time. Therefore, in order to enhance the cleaning ability, a large capacity blast nozzle and a blast material supply device may be used, but the blast material is injected with a particle number distribution as shown in this figure, and at the point on the blast nozzle center axis, If the cleaning ability becomes excessive and the heat transfer tube is worn and the wear progresses, there is a risk of perforation. FIG. 3 is a chart showing a collision angle and a cleaning ability distribution in a general blast material injection. Further, as shown in this figure, the cleaning ability also changes depending on the angle at which the blast material collides with the object.

FIG. 4 is a table showing the cleaning capacity distribution of the embodiment of the present invention. Therefore, by installing the blast nozzle 1 at a position displaced from the center line of the heat transfer tube, the peak point of the blast nozzle cleaning ability is driven to the outside of the heat transfer tube,
With the distribution of the cleaning ability as shown in this figure, the upper half and the lower half of the heat transfer tube can be cleaned over a wide range with uniform cleaning ability to avoid wear and cutting of the heat transfer tube. Next, a specific configuration of this embodiment will be described. FIG. 5 is an explanatory diagram showing a specific configuration of the embodiment of the present invention. This figure is also a system diagram showing the overall configuration. As shown in this figure, 5 is the injection device shown in FIG.
6 is a recovery device shown in FIG. 1, 13 is a moving mechanism, 14 is a blast device, 15 is a blower, 16 is a heat transfer tube group, 17 is an injection hose, and 18 is a recovery hose. The joint surface of the injection device 5 and the recovery device 6 is composed of a scattering prevention brush 3 having a shape corresponding to the shape of the heat transfer tube, and has a layer density and elasticity that prevent the blast material and the crushed hard scale from leaking. Therefore, there is no hindrance when the injection device 5 and the recovery device 6 move in the axial direction of the heat transfer tube.

The moving device 13 holds the injection device 5 and the recovery device 6 and moves the injection device 5 and the recovery device 6 in synchronization with each other to move the heat transfer tube group 16 horizontally and vertically to an arbitrary cleaning place. First, the injection device 5 and the recovery device 6 are conveyed to a target cleaning target position, and the injection device 5 and the recovery device 6 are moved in the horizontal direction and abutted against each other. Next, after cleaning at the target cleaning place, the wheels rolling on the top heat transfer tubes of the heat transfer tube group 16 are rotated to clean the adjacent areas.
The injection device 5 and the recovery device 6 are moved in synchronization with each other in the axial direction of. After the cleaning of the pair of heat transfer tubes 7 is completed, the injection device 5 and the recovery device 6 are moved in the vertical direction by the distance between the heat transfer tubes 7 to clean and move them in the axial direction of the next heat transfer tube 7. To do. When the cleaning of all the heat transfer tubes 7 is completed, the injection device 5 and the recovery device 6 are moved in the horizontal direction, separated, and opened.

The blasting device 14 conveys the blasting material from the tank installed in the device by compressed air and collides it with the heat transfer tube from the injection device 5. The blower 15 is installed outside the furnace and sucks and discharges the crushed and peeled hard scale and the blast material together with air. When the injection device 5 and the recovery device 6 are installed, compressed air starts to convey the blast material, and the blast material is sent to the injection device 5 by the injection hose 17. At the same time, the recovery device 6 starts suction, sucks the crushed hard scale and the blast material, and discharges them through the recovery hose 18 by the blower 15 installed outside the furnace. Therefore, it is possible to perform a cleaning operation with less dust scattering in the cleaning place.

Next, other embodiments of the recovery apparatus of the present invention will be described. FIG. 6 is a vertical sectional view showing the configuration of the embodiment of the present invention. The present embodiment is an example in which the recovery nozzle 4 is installed in the lower part of the hood 2 of the recovery device 6, and when the hard scale cannot be finely crushed and it is difficult to convey it as it is by the flow of air, the hard scale is collected in the lower part of the hood 2. Can be collected.

FIG. 7 is a plan view showing the structure of another embodiment of the present invention. FIG. 8 is a vertical sectional view of FIG. 7. In each of the above-described embodiments, the blast material is injected from one direction to heat transfer pipe 7
Although only one side could be cleaned, this embodiment shows an example in which both sides of the heat transfer tube 7 can be cleaned at the same position at the same time. A recovery nozzle 4 is installed below the hood 2 of the injection device 5 shown in FIG. 1 and is connected to the blast nozzle 1 via a check valve 20 that opens only during recovery to form an injection device 25.
Is a device in which the injection device 25 having the same structure is installed so as to oppose the heat transfer tube 7 so that the injection direction is orthogonal to the gap direction of the heat transfer tube 7. After injecting the blast material to clean one side of the heat transfer tube 7, the blast device 14 shown in FIG. 5 switches the injection direction and the recovery direction to inject the blast material to clean the opposite side of the heat transfer tube 7, Clean both sides at the same position.

Next, another embodiment for cleaning at the same position will be described. FIG. 9 is a vertical sectional view showing the structure of another embodiment of the present invention. FIG. 10 is a longitudinal sectional view of FIG. In the hood 32 of this embodiment, the hood 2 shown in FIG. 7 is extended in the axial direction of the heat transfer tube 7, and the blast nozzle 1 and the recovery nozzle 4 below the blast nozzle 1 are attached to both ends of the hood 32 to form an injection device 35. The recovery device 36 uses the injection device 35 having the same structure as the heat transfer tube 7
Are installed so as to face each other so that the sandwiching jet direction intersects with the heat transfer tube 7. The cleaning method is the same as that of the embodiment shown in FIGS. 7 and 8, and the blasting device 14 shown in FIG. 5 switches injection and recovery of the blasting material to clean both surfaces of the heat transfer tube 7 at the same position.

As described above, according to this embodiment,
(1) Generally, a large amount of dust is generated, and the blast cleaning work can be performed without dust. (2) There is no wear or cutting caused by locally cleaning the heat transfer tube. (3) A wide range of heat transfer tubes can be used at once. There are effects that it can be cleaned and (4) it can be cleaned while moving in the axial direction of the heat transfer tube.

[0023]

According to the present invention, the blast material injection means and the blast material recovery means are arranged in the middle of the parallel heat transfer tubes, and the injection flow path of the blast material is shielded by the brush for injection.
By moving the heat transfer tube in the axial direction, it is possible to efficiently clean the adhering material attached to the outer surface of the heat transfer tube without scattering dust.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of an embodiment of the present invention.

FIG. 2 is a chart showing a particle number distribution in a general blast material injection.

FIG. 3 is a chart showing a collision angle and a cleaning ability distribution in a general blast material injection.

FIG. 4 is a chart showing a cleaning capacity distribution according to an embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a specific configuration of the embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing the configuration of the embodiment of the present invention.

FIG. 7 is a plan view showing the configuration of another embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view of FIG.

FIG. 9 is a vertical sectional view showing the structure of another embodiment of the present invention.

10 is a vertical cross-sectional view of FIG.

FIG. 11 is a perspective view showing a conventional cleaning device.

[Explanation of symbols]

 1 Blast Nozzle 2 Hood 3 Scatter Prevention Brush 4 Recovery Nozzle 5 Injection Device 6 Recovery Device 7 Heat Transfer Tube 13 Moving Mechanism 14 Blast Device 15 Blower 16 Heat Transfer Tube Group 17 Injection Hose 18 Recovery Hose 20 Check Valve 25 Injection Device 26 Recovery Device 32 Hood 35 Injection device 36 Recovery device

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[Procedure amendment]

[Submission date] April 26, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Delete

Claims (4)

[Claims] 1. A first nozzle for injecting a blast material into a gap between a heat transfer tube and a heat transfer tube having a hard adhered substance attached to an outer surface thereof, and the blast injected as opposed to the first nozzle. The second for sucking the hard deposits that have been separated from the material
And a holding means for holding the first nozzle and the second nozzle in the middle of the heat transfer tube and the heat transfer tube. 2. A first nozzle for injecting a blast material into a gap between the heat transfer tube and a heat transfer tube in which hard deposits arranged in parallel in a furnace at equal intervals are attached to the outer surface, and the first nozzle. A blast material ejecting means that is attached to the first hood that is opened in the blast material ejection direction, and a brush that covers one side of the first hood opening and that is installed in the blast material ejection direction. A second nozzle that is arranged so as to face the first nozzle and that sucks the hard adhered matter that has separated from the sprayed blast material, and that is attached to the second nozzle and opens in the first hood direction. An apparatus for cleaning deposits on heat transfer tubes, characterized in that the other end of the brush is provided with a blast material recovery means including a second hood covering the opening. 3. A first nozzle for injecting blast material into a gap between a heat transfer tube and a heat transfer tube in which hard deposits arranged in parallel in a furnace at equal intervals adhere to the outer surface, and the first nozzle. A blast material ejecting means that is attached to the first hood that is opened in the blast material ejection direction, and a brush that covers one side of the first hood opening and that is installed in the blast material ejection direction. A second nozzle that is arranged so as to face the first nozzle and that sucks the hard adhered matter that has separated from the sprayed blast material, and that is attached to the second nozzle and opens in the first hood direction. Then, the other end portion of the brush is provided with a blast material collecting means including a second hood covering the opening portion, the blast material injection means and the blast material collecting means, and the axial direction of the heat transfer tube. At the end of the heat transfer tube Heat transfer tube deposit cleaning apparatus characterized by comprising a moving means for moving in a direction perpendicular to the direction. 4. The heat transfer tube adhering material cleaning device according to claim 2, wherein a portion of the brush that abuts on the heat transfer tube is cut out according to the shape of the heat transfer tube.