JP2000310500A - Cleaning material capturing apparatus for tube type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning material capturing apparatus for tube type heat exchanger in which cleaning material standing on a capturing grid face can be extracted efficiently through simple arrangement and the heating tubes of a heat exchanger can be cleaned efficiently. SOLUTION: The cleaning material capturing apparatus for a tube type heat exchanger comprises a grid 3 disposed in a cooling water passage in order to capture a cleaning material passed through the heating tubes of the heat exchanger while cleaning, and a box type protrusion 2 and a cleaning material extraction pipe 7 provided on the wall part of a cooling water passage on the upstream side of the capturing grid in order to extract the captured cleaning material to the outside of the cooling water passage. A vortex flow plate 16 is provided in the cooling water passage in the vicinity of the box type protrusion 2 on the upstream side thereof while projecting into the cooling water passage and extending orthogonally to the cooling water flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a washing body collecting apparatus for a tubular heat exchanger, and more particularly to a washing body for collecting a washing body that has passed through a heat transfer tube of a heat exchanger and washed in a cooling water passage. The present invention relates to a washing body collecting device for a tubular heat exchanger, comprising a collecting grid, a box-shaped projection for extracting the washing body collected by the collecting grid to the outside of the cooling water passage, and a washing body extracting pipe. is there.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open Nos. 60-64197 and 61-165 relate to such a generally known type of washing body collecting apparatus for a tubular heat exchanger.
596 or JP-A-63-29298. That is, these publications describe (a) an example of a V-shaped grating and an eddy current generating plate, (b) another example of a V-shaped grating and an eddy current generating plate, and (c) an example of a box-shaped protrusion and an I-type grating. Have been.

FIG. 16 and FIG.
-64197 discloses a concept of a cleaning body collecting device. In this cleaning body collecting device, a V-shaped main grid 61, a sub-grid 62, a cleaning body extraction pipe 64, a vortex generating plate 67, and a covering plate 69 are arranged inside a cylindrical body 65,
It is configured.

FIGS. 18 and 19 show the concept of a heat transfer tube cleaning body collecting apparatus described in the above-mentioned Japanese Patent Application Laid-Open No. 61-165596. This cleaning body collecting device is provided with a V-shaped grid main grid 71, a sub-grid 72, a cleaning body extraction pipe 74, a vortex generating plate 77, and an upper flat plate 79 provided in a cylindrical body 75.

FIG. 12 to FIG.
Japanese Patent Application Laid-Open No. 3-29298 discloses a pipe-type heat exchanger cleaning body collecting apparatus. That is, box-shaped protrusions (recessed portions as viewed from the cooling water channel wall) 12 and 2 are provided at the upper and lower portions of the cylindrical body 1 so as to be closed at a surface in contact with the cylindrical body 1. Is provided with an inclined collection grid 3 for collecting the cleaning body 20 so as to be in contact with the surfaces of the box-shaped projections 12 and 2.

[0006] The collection lattice 3 is provided with a rotating shaft 4, and has a structure that can be swung by a handle 6 via a speed reducer 5. A washing body extraction pipe 7 for extracting the collected washing body 20 to the outside of the cooling water passage is provided on the lower box-shaped protrusion 2. The cleaning body 20, such as a sponge ball, which has been washed while passing through the heat transfer tube of the tubular heat exchanger, reaches the cleaning body collecting device 10 through the cooling water passage. The cleaning body 20 collides with the collection grid 3 provided at an inclination, rolls along the inclination, and is formed so as to be extracted by the cleaning body extraction pipe 7 provided at the lower box-shaped projection 2. Have been.

[0007]

With respect to the cleaning device for a tubular heat exchanger formed as described above, for example, in Japanese Patent Application Laid-Open No. 60-64197, the structure of the lattice portion is complicated. There is a problem. That is, FIG.
As shown in FIGS. 6 and 17, the V-shaped main grid 61, the sub grid 62, the cleaning body extraction pipe 64, the vortex generating plate 67, and the upper flat plate 69 are provided inside the cylindrical body 65. Its configuration tended to be complicated.

In Japanese Patent Application Laid-Open No. 61-165596, the structure of the lattice portion is slightly simplified, but the structure is still complicated. That is, as shown in FIGS. 18 and 19, the V-shaped lattice main lattice 71, the sub lattice 72, the cleaning body extraction tube 74, the vortex generating plate 77, and the upper flat plate 79 are provided in the cylindrical body 75. Therefore, similarly to the above, the structure is complicated and further simplification has been desired.

In Japanese Patent Application Laid-Open No. 63-29298, the structure of the grid portion is simple, but there is a problem that the cleaning body stagnates on the grid surface and the cleaning body is not smoothly circulated. That is, in this configuration, the cleaning body 20 such as a sponge ball that has collided with the surface of the collection grid 3 rolls along the slope and is extracted by the cleaning body extraction pipe 7 provided in the lower box-shaped protrusion 2. In other words, the cleaning body 20 often stays on the surface of the collection grid 3, and the cleaning body 20 may not be efficiently extracted.

FIG. 14 shows an example of a situation where the cleaning body 20 cannot be efficiently extracted. The flow in the vicinity of the cleaning body 20 is a flow toward the both side walls of the lower box-shaped protrusion 2 as indicated by an arrow 14, and the cleaning body 20 does not roll down after colliding with the collection lattice 3, It flows in both side directions, and flows away from the washing body extraction pipe 7 provided at the center of the lower box-shaped protrusion 2.

FIG. 20 and FIG. 21 show conventional flow state diagrams. The flow mainly flows as shown at 81, 82 and 83, and the flow 81 in the central part has a high velocity, and after the collision with the grid 3, flows in the direction of the low-velocity flows 82 and 83. And stagnates on the surface, making it difficult to flow in the direction of the extraction pipe 7. For this reason, it has been desired that the washing body 20 stagnating on the surface of the collection lattice 3 be caused to flow in the direction of the washing body extraction pipe 7 so that the washing body 20 is efficiently extracted and circulated in the washing system.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and it is an object of the present invention to simplify the structure and to efficiently extract a cleaning body stagnating on a collection grid surface from a box-shaped protrusion, and to provide a heat exchanger. It is an object of the present invention to provide a washing body collecting apparatus for a tubular heat exchanger of this type, which can efficiently wash a heat transfer tube.

[0013]

That is, the present invention relates to a collection grid provided in a cooling water passage for collecting a cleaning body that has been washed through a heat transfer tube of a heat exchanger, and an upstream of the collection grid. A cleaning body for a tubular heat exchanger, provided on a side wall of a cooling water passage, provided with a box-shaped protrusion and a cleaning body extraction pipe for extracting the cleaning body collected by the collection grid to outside the cooling water passage. In the trapping device, a vortex generating means for generating a vortex in the flow of the cooling water is provided in the cooling water passage near the upstream side of the box-shaped protrusion to achieve the intended purpose.

The present invention is provided in a cooling water passage,
A collecting grid for collecting the cleaning body that has passed through the heat transfer tube of the heat exchanger and cleaning the cleaning body, provided on a cooling water passage wall on the upstream side of the collecting grid, and collected by the collecting grid; In the washing body collecting device for a tubular heat exchanger having a box-shaped projection for extracting water to the outside of the cooling water passage and a washing body extraction pipe, cooling is performed in the cooling water passage near the upstream side of the box-shaped projection. A swirl plate that extends in a direction perpendicular to the flow of water and protrudes into the cooling water passage is provided.

In this case, the tip of the vortex plate protruding into the cooling water passage is formed in a straight line, a concave surface, a convex surface, or a combination thereof. Further, the swirl plate is fixedly held on an upstream side wall surface of the box-shaped protrusion.

That is, according to the cleaning device for a tubular heat exchanger formed as described above, the vortex which generates a vortex in the flow of the cooling water is formed in the cooling water passage near the upstream side of the box-shaped protrusion. Since a vortex plate extending in a direction perpendicular to the flow of the cooling water and protruding into the cooling water passage is provided, the vortex plate is provided upstream of the box-shaped protrusion. Since the cooling water flow is locally depressurized, a strong vortex flows from the outside to the inside in the vicinity of the washing body extraction pipe, and the washing body does not stagnate on the collection lattice surface, and the washing body does not stagnate from the outside. The vortex flows in the direction of the washing body extraction tube, so that the washing body can be efficiently extracted and circulated in the washing system.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. Before that, a cleaning system provided with this cleaning body collecting apparatus will be described. FIG. 15 is a flowchart showing the entire cleaning system. In the figure, reference numeral 10 denotes a washing body collecting device, 32 denotes a tubular heat exchanger, 33 denotes a cooling tower, and 41 denotes a washing unit.

First, the cooling water is pressurized by the cooling water pump 31 and enters the tubular heat exchanger 32 through the cooling water inlet pipe 34, and flows leftward in the heat transfer tube in the upper half of the tubular heat exchanger. In the lower half, it flows rightward to exchange heat with the fluid outside the heat transfer tube, and flows into the cooling tower 33 from the cooling water outlet pipe 35 through the washing body collecting device 10. After being cooled by the cooling tower 33, the cooling water is again sent to the tubular heat exchanger 32 by the cooling water pump 31 in a circulating flow.

The washing unit 41 has a circulation pump 43 driven by a motor 42, and the suction side is connected to the washing body extraction pipe 7 of the washing body collecting device 10 via a washing body extraction valve 36, The discharge side is connected to the inlet port 4 of the washing body collecting device by the conduit 49.
4 is connected to a washing body recovery unit 45, and a conduit 50 from the washing body recovery unit 45 is connected to a three-way valve 46 and a conduit 5.
2. It is connected to a cooling water inlet pipe 34 on the upstream side of the tubular heat exchanger 32 via a cleaning body input valve 37.

In the present embodiment, the above-mentioned cleaning body collecting device 45 comprises a vertical cylindrical container main body, a lid capable of opening and closing the upper part of the container main body, and a basket stored in the inner bottom of the container main body. The conduit 49 and the mother pipe 50 are connected to an intermediate portion of the container body.

The three-way valve 4 is connected to the bottom of the container body.
6 is connected, and by switching the three-way valve 46, it is possible to select whether to flow water from the conduit 49 to the conduit 50 via the washing body recovery unit 45 or to flow through the conduit 51. Has become. The check valve 47 is connected to the conduit 5
1 to prevent backflow, the sight glass 48
It is installed in the middle of the conduit 52 and visually checks passage of the cleaning body 20.

Next, the operation of the cleaning unit 41 will be described. In the system shown in FIG. 15, the washing body input valve 37, the washing body extraction valve 36, and the washing body recovery unit inlet valve 44 are opened, and the three-way valve 46 is set so that water flows through the conduits 60 and 52. . In this state, the motor 42
Is driven, and the cleaning body collecting device 10 is driven by the circulation pump 43.
A part of the cooling water is introduced from the washing body extraction pipe 7 of FIG.
Through the washing body recovery unit 45 and further through the conduits 50 and 52, the cooling water inlet piping 34 on the upstream side of the tubular heat exchanger 32.
Pour into At this time, if a predetermined number of washing bodies 20 are put in the basket of the washing body recovery unit 45, the washing bodies 20 are introduced from the conduit 52 into the cooling water inlet pipe 34 with the passage of water, and the tubular heat exchange is performed. Removal of the deposits on the inner surface of the heat transfer tube through the inside of the heat transfer tube of the vessel 32 is performed.

The cleaning body 20 that has passed through the tubular heat exchanger 32
Is collected by the washing body collection device 10 through the cooling water outlet pipe 35, reaches the circulation pump 43 from the washing body extraction pipe 7 through the washing body extraction valve 36, and is circulated through the conduit 49. Therefore, in this state, the cleaning body 20 continuously flows between the cleaning unit 41 and the tubular heat exchanger 32, and quick and efficient heat transfer tube cleaning is performed.

After the cleaning, the three-way valve 46 is connected to the conduits 51 and 5.
2 is switched to a position where the cooling water is connected, so that the cooling water flows through the conduit 49, the cleaning body collector 45, the conduit 51, the three-way valve 46, and the conduit 52. As a result, the washing body 20 contained in the cooling water stays in the basket of the washing body recovery unit 45, and the cooling water flows between the washing body 20 and the tubular heat exchanger 32 in the above-described path. Therefore, all the circulating cleaning bodies 20 are collected in the basket. After this operation is continued for a predetermined time, the circulating pump 43 is stopped to complete the cleaning.

Next, the cleaning body collecting apparatus 10 of the present invention will be described. FIGS. 1 to 3 show a cleaning body collecting apparatus in which the swirl plate of the present invention is welded to the inside of the cooling water passage, and the upper end surface of the swirl plate is made linear (linear, welded to the inner surface of the cylindrical body). 2 is a conceptual diagram of a vertical side surface of FIG. 1, and an AA section and a BB section.

In these figures, box-shaped projections 12 and 2 are provided on the upper and lower portions of the cylindrical body 1 so as to open on the surface in contact with the cylindrical body 1, and a cleaning body 20 is provided inside the body 1. The collection grid 3 installed at an angle for collection is installed so as to be in direct contact with the inner wall surfaces of the box-shaped projections 12 and 2.

The collection lattice 3 is provided with a rotating shaft 4, and is configured to be swingable by a handle 6 via a speed reducer 5. Here, the trapping grid 3 is manually swung, but may be driven electrically or hydraulically or pneumatically. When the body 1 has a small diameter, the speed reducer 5 may be omitted. Washed body 20 collected
Is extracted from the cooling water passage, and is provided in the lower box-shaped protrusion 2. The number of the washing body extraction tubes 7 may be two or more.

The vortex plate 16 has a straight upper end surface, is disposed at right angles to the flow of the cooling water, and is fixed to the inner surface of the cylindrical body 1 by welding or the like on the upstream side of the lower box-shaped projection 2. You. As described above, the swirl plate 16 is formed by the lower box-shaped projection 2.
The vortex 18 acts on the downstream side of the vortex plate 16 so as to flow from the outside to the inside as shown by an arrow in FIG.
After the collision with the collection grid 3, the cleaning body 20 forms the vortex 18
Thus, the water is efficiently extracted by the washing body extraction pipe 7 without stagnation on the collection lattice 3.

That is, as shown in FIGS. 22 and 23, the flow of the cooling water is mainly 91,
The flow 91 at the center is affected by the swirl plate 16 and the velocity is slowed down due to the negative pressure. The cleaning body flows in the direction of the flow 91 having a low speed, and the cleaning body does not stay on the surface of the lattice 3 and easily flows in the direction of the extraction pipe 7.

Here, the overall flow will be described with reference to FIG. 15 described above. The washing body 20 such as sponge balls washed through the heat transfer tubes of the tubular heat exchanger 32 is connected to the cooling water outlet pipe 35. As a result, the cleaning body collecting device 10 is reached. This cleaning body 20 collides with the collection grating 3 surface installed at an angle,
It rolls along the slope, rides on the swirl 18 generated by the swirl plate 16, flows in the direction of the washing body extraction pipe 7 provided in the lower box-shaped projection 2, and extracts from the cooling water passage into the washing body circulation system. It is done.

FIGS. 4 and 5 show another example of the swirl plate of the present invention (straight, attached to the upstream side wall surface of a box-shaped projection). The front of the box-shaped projection and its cross section are shown. Have been. The swirl plate 22 has a straight upper end surface as in the previous embodiment, and is arranged at right angles to the flow of cooling water. Further, in this case, particularly, on the upstream side of the lower box-shaped protruding portion 2, it is attached using the wall surface on the upstream side of the lower box-shaped protruding portion 2. In this way, the vortex plate 22 is mounted using the wall surface on the upstream side of the box-shaped protruding portion, so that the vortex flow is generated by a function of an arc over the entire length, because the position is easy to set and the production is easy. The effect that can be expected can be expected.

FIGS. 6 and 7 show a third embodiment of the swirl plate of the present invention.
(Concave, attached to the upstream side wall surface of the box-shaped projection), showing the front of the box-shaped projection and its cross section. In this case, the upper end surface of the vortex flow plate 24 is formed in a concave shape, is arranged at right angles to the flow of the cooling water, and is located upstream of the lower box-shaped protrusion 2 on the upstream side wall surface of the lower box-shaped protrusion 2. It can be attached using. As described above, even when the concave eddy current plate 24 is attached to the upstream side wall surface of the box-shaped projection, the manufacture is easy, and the effect that the eddy current can be generated with a uniform function over the entire length is obtained. Can be expected.

FIGS. 8 and 9 show a fourth example of the swirl plate (convex, attached to the upstream side wall of the box-shaped projection) of the present invention. A cross section is shown. In this case, the swirl plate 26 has an upper end surface formed in a convex shape and is arranged at right angles to the flow of the cooling water. The swirl plate is attached on the upstream side of the lower box-shaped protrusion 2 by using the upstream side wall surface of the lower box-shaped protrusion 2. As described above, in the case where the convex vortex plate 26 is attached to the upstream side wall surface of the box-shaped protrusion, the vortex can be made larger at the center, and the vortex is generated by a function of a double arc, as well as being easy to manufacture. The effect that can be expected can be expected.

FIGS. 10 and 11 show a fifth embodiment of the swirl plate of the present invention (in which the upstream side wall of the box-shaped projection is used). The front of the protrusion and its cross section are shown. In this case, the swirl plate 28 has a straight upper end surface and is arranged at right angles to the flow of the cooling water. This swirl plate is formed on the upstream side of the lower box-shaped protrusion 2 by using the upstream side wall itself of the lower box-shaped protrusion 2. Thus, the linear swirl plate 2
In the case of using the upstream side wall of the box-shaped projecting portion as 8, it is easy to manufacture, and the effect of generating a vortex as a function of an arc over the entire length can be expected.

As described above, in the cleaning body collecting device formed as described above, since the swirl plate is provided on the upstream side of the box-shaped projection, the cleaning pressure is locally reduced, so that the cleaning is performed. In the vicinity of the body extraction tube, a strong vortex flowing from the outside to the inside is generated, and the cleaning body such as a sponge ball is put on the vortex flowing from the outside to the inside without stagnation on the collection lattice surface, i.e., washing. The washing body is flowed in the direction of the body extraction tube, so that the washing body can be efficiently extracted and circulated in the washing system.

[0036]

As described above, according to the present invention, the cleaning members stagnating on the collection grid surface can be efficiently collected and extracted on the box-shaped projections by simplifying the structure, and the heat transfer tube It is possible to obtain this type of cleaning device for a tubular heat exchanger that can efficiently perform cleaning.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing one embodiment of a cleaning device for a tubular heat exchanger according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a front view showing an embodiment of the cleaning device for a tubular heat exchanger of the present invention.

FIG. 5 is a sectional view taken along line CC of FIG. 4;

FIG. 6 is a front view showing another embodiment of the washing body collecting device for a tubular heat exchanger of the present invention.

FIG. 7 is a sectional view taken along line DD of FIG. 6;

FIG. 8 is a front view showing another embodiment of the washing body collecting device for a tubular heat exchanger of the present invention.

FIG. 9 is a sectional view taken along line EE in FIG. 8;

FIG. 10 is a front view showing another embodiment of the washing body collecting device for a tubular heat exchanger of the present invention.

FIG. 11 is a sectional view taken along line FF of FIG. 10;

FIG. 12 is a vertical sectional side view of a conventional cleaning device for a tubular heat exchanger.

FIG. 13 is a sectional view taken along line GG of FIG.

FIG. 14 is a sectional view taken along the line HH in FIG. 12;

FIG. 15 is a system diagram of a cleaning system to which the cleaning device for a tubular heat exchanger of the present invention is applied.

FIG. 16 is a vertical sectional side view showing an example of a conventional cleaning body collecting device.

FIG. 17 is a vertical sectional side view showing an example of a conventional cleaning body collecting device.

FIG. 18 is a vertical sectional side view showing an example of a conventional cleaning body collecting device.

FIG. 19 is a vertical sectional side view showing an example of a conventional cleaning body collecting device.

FIG. 20 is a flow state diagram of a conventional cleaning body collecting device.

FIG. 21 is a flow state diagram of a conventional cleaning body collecting device.

FIG. 22 is a flow state diagram of the cleaning body collecting device of the present invention.

FIG. 23 is a flow state diagram of the cleaning body collecting device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... cylindrical body, 2 ... lower box-shaped protrusion, 3 ... collection grid,
4 ... rotating shaft, 5 ... reducer, 6 ... handle, 7 ... washing body extraction tube, 10 ... washing body collecting device, 12 ... upper box-shaped protrusion,
14: vortex without vortex plate, 16: vortex plate, 18: vortex with vortex plate, 20: cleaning body, 22: vortex plate attached to straight / box-shaped protrusion upstream side wall surface, 24: concave shape A swirl plate mounted on the upstream side wall surface of the box-shaped protrusion, 26: a swirl plate mounted on the upstream side wall surface of the box-shaped protrusion, 28 ... a swirl plate using the upstream side wall itself of the linear / box-shaped protrusion.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tetsuya Otake 3-2-2, Sachimachi, Hitachi-shi, Ibaraki Prefecture Within Hitachi Engineering Services Co., Ltd. (72) Inventor Shoji Ametsuki 3-1-1 Sachimachi, Hitachi-shi, Ibaraki No. 1 F term in Hitachi, Ltd. Hitachi Plant (reference) 3B116 AA12 AB51 BA01 BA22 BA39

Claims (4)

[Claims] 1. A collection grid provided in a cooling water passage for collecting a cleaning body that has passed through and washed in a heat transfer tube of a heat exchanger, and provided on a cooling water passage wall upstream of the collection grid. The washing body collecting device for a tubular heat exchanger, comprising: a box-shaped projection for extracting the washing body collected by the collection grid to the outside of the cooling water passage; and a washing body extraction pipe. A vortex generating means for generating a vortex in the flow of the cooling water in a cooling water passage near an upstream side of the section. 2. A collecting grid provided in the cooling water passage for collecting the cleaning body that has passed through the heat exchanger tube of the heat exchanger and collected, and provided on the cooling water passage wall on the upstream side of the collecting grid. The washing body collecting device for a tubular heat exchanger, comprising: a box-shaped projection for extracting the washing body collected by the collection grid to the outside of the cooling water passage; and a washing body extraction pipe. A vortex plate extending in a direction orthogonal to the flow of the cooling water and protruding into the cooling water passage, in the cooling water passage near the upstream side of the portion, wherein cleaning is performed. Body collection device. 3. The cleaning body catcher for a tubular heat exchanger according to claim 2, wherein the projecting tip of the vortex plate projecting into the cooling water passage is formed in a linear shape, a concave shape, a convex shape, or a combination thereof. Collector. 4. The apparatus for collecting a cleaning body for a tubular heat exchanger according to claim 2, wherein the swirl plate is fixedly held on an upstream side wall surface of the box-shaped projection.