JPS597899A - Cleaning medium collector for pipe-type heat exchanger - Google Patents

Abstract

PURPOSE:To contrive to enhance collecting efficiency, by a method wherein side surfaces of a collecting grid are set to be parallel with a streamline, and an upstream-side surface of a sash bar plate is made to be a three-dimensional curved surface. CONSTITUTION:A duct 13 having a recessed cross-sectional shape and opened to the upstream side of a fluid and a plurality of plate form sash bars 11 oscillatably supported while facing a fluid passage and having lower end parts located in proximity to both side edges of the duct 13 are placed at appropriate spacing at a position substantially bisecting the fluid passage, are so inclined as to be opened wider to the upstream side, and upper end parts of the sash bars are placed in substantial contact with the inside wall of the fluid passage to constitute the collecting grid 12, wherein the side surfaces of each of the sash bar plates 19 of the grid 12 are set to be parallel with the streamline and the surface formed by connecting the upstream-side surface 23 of the thus arranged sash bar plates 19 constitute a three-dimensional curved surface. A V-shaped cleaning medium collector obtained by combining two or more grid thus formed is used to collect a cleaning medium at several points only by the three-dimensional curved surfaces and the duct 13. Accordingly, it can be contrived to reduce the size of the collector and to enhance the collecting efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for cleaning the inner surfaces of heat transfer tubes of a heat exchanger by mixing a cleaning body such as a sponge ball into a fluid, and then using a tube for collecting the cleaning body after cleaning the inner surface of a heat transfer tube of a synthetic heat exchanger. The present invention relates to a cleaning and collection device for type heat exchangers.

Generally, in order to clean the inner surface of heat transfer tubes built into a heat exchanger, a cleaning body such as a sponge ball is mixed into the tube side fluid.
When the cleaning body passes through the heat exchanger tube, it removes water scale, foreign matter, etc. adhering to the inner surface of the heat exchanger tube, and then the cleaning body that flows into the driftwood outlet pipe forms a part of the fluid outlet pipe. A disposed collection device is adapted to collect the fluid from the fluid outlet tube.

If a conventional grid made of one plane is used as the grid for a cleaning body collection device, it can only collect cleaning bodies in a linear manner, so a second stage grid is required to collect the cleaning bodies in a dotted manner. However, there is a drawback in that it is not possible to manufacture a cleaning body collecting device in which the grating portion is composed of only one stage of the grating.

The cleaning body collection device that uses a conventional one-plane grid is 5g1
As shown in FIG. 1 and FIG.
．． 2, a cleaning body extraction pipe 3 connected to the lower part of the downstream grid 2, and a body 5 incorporating these inside.

In this way, when a one-plane grating is adopted as the grating of the cleaning body collection device, a two-stage grating consisting of a pair of upstream gratings 1 and a pair of downstream gratings 2 is required, and the cleaning body covers the grating surface. In order to roll smoothly without getting caught, both the upstream grating 1 and the downstream grating 2 require a certain slope, so the length of the upstream portion is t.

and the length 11 of the downstream portion are approximately equal. For this reason, the manufacturing costs of the fuselage 5f: the upstream grid 1gAl portion including the upstream grid 1gAl part and the downstream grid 2 side part are approximately the same, resulting in a drawback that the overall cost is high. In addition, as the plant output capacity increases, the diameter of the body 5 increases, and the size of the cleaning body collection section consisting of the lattice part also increases, and the body length L+
It also becomes longer, making transportation and on-site installation difficult.

Furthermore, since an obstacle such as the downstream grating plate 8 is disposed at the center of the fluid passage where the flow velocity is highest, there is a drawback that pressure loss becomes large.

In place of the one-plane gratings 1 and 2 constituting the two-stage grating cleaning body collection device, which have the drawbacks mentioned above, a one-stage grating cleaning body collection lid that eliminates these drawbacks has recently been proposed as shown in Fig. 3. A collection grid 12 was devised as shown in FIGS. This collection grid 12 has ducts 13 arranged in a mountain shape on the downstream side of a large number of horizontal plates 19 to collect the cleaning material, and the lower ends of the ducts 13 are located on the side wall of the body 11, and the collection grid 12 is partially arranged. On the other hand, since two cleaning body extraction pipes 14 are installed, there are disadvantages in that the amount of extracted water is large and the capacity of the ball circulation pump is large.

An object of the present invention is to provide a cleaning body collection device for a tubular heat exchanger that can reduce the size of the collector, smoothly collect cleaning bodies, and improve collection efficiency. .

In order to achieve such an object, the present invention provides at least one structure that is formed facing a center line that substantially partially covers a fluid passage, has both side walls of the fluid passage as the top, and descends toward the direction near the center of the fluid passage. A duct having a roof-like slope and a concave cross-section opening toward the upstream side of the fluid, and a lower end portion located near both edges of the duct, the duct being swingably supported while facing each other in the fluid passage. A large number of plate-shaped rods are arranged side by side at appropriate intervals and extend at an angle to expand toward the upstream side. In a cleaning body collection device for a tubular heat exchanger, which is equipped with a cleaning body extraction unit connected to a collection grid and a cleaning body extraction unit at a lower end of the collection near the center of the fluid passage of the duct, a side surface of each horizontal plate of the collection grid is Combining two or more lattice surfaces that are parallel to the streamlines and arranged so that the surface formed by connecting the upstream surfaces of the horizontal plates that are arranged becomes a three-dimensional curved surface, and each surface has a certain angle, By combining them in a figure 7 shape, the cleaning body can be collected at one or several points using only the two three-dimensional curved surfaces and the duct.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

7 through 13, a row of cleaning body collection gratings of the present invention is shown. In these figures, the cleaning body collection device mainly includes the body IJ, the collection grid 12, the duct) 13,
It consists of a cleaning body extractor #14, a side guide plate 17, etc. Seven flanges are welded to both ends of the body 11 so as to connect to a cooling water outflow pipe from a condenser (not shown). A cleaning body extraction pipe 14 is attached to one side in the radial direction of the downstream part of the body 11, and a flange v'i7 is attached to the outer end of the body to connect it to a cleaning body circulation system (not shown). The inner end of the body is bent toward the upstream side of the cooling water, and is connected to the collective lower end of the duct 13. duct) 131-j has a roughly semicircular cross section, its opening faces upstream of the cooling water, and has both slopes in a V-shape with the apex at the side of the fuselage, and the lower end thereof is The body inner end Vc of the cleaning body extraction pipe 14 is connected. The width of the duct 13 and the inner diameter of the cleaning body extraction tube 14 are both large enough to allow a cleaning body such as a sponge ball to easily pass through.

The branch roots 19 constituting the collection grid 12 according to this embodiment l+u are positioned by the distant rods 20 arranged through the holes of the branch roots 19 and the distant rods 20 passing through, and the end faces of the branch roots 19 are located on the collection grid 12. By arranging the constant pieces 21 cut at an inclination angle θ of #J formed by connecting the upstream surfaces 23 of each test plate is juxtaposed almost on a three-dimensional curved surface.

These branches and roots 19 are at the collection position of the collection grid 12,
It extends upstream from near the side edge of the duct 13 and is inclined at an appropriate angle θ so as to form a V-shape with the opposing collection grids 12 and 12, and the upstream end of the branch root is connected to the inner wall of the body. It is almost in contact with . Further, a collection grid shaft 15 is fixed to the collection grid 12, one end of this collection grid shaft 15 protrudes outward from the body 11, and a collection grid handle 16 is fixed to the shaft end. By operating this handle, the collection grid 12 can be swung.

A side guide plate 17 is provided close to the branch root 19 at the side edge of the collection grid 12.

Next, is the cleaning body mixed in and passing through the heat transfer tube of the condenser to clean it? When the finished cleaning body and cooling water flow from the upstream side of the body 11 through the cooling water outflow pipe, the cleaning body is transferred to a pair of collection gratings 12. '12, moves downstream along the inclined branch root 19, and ends up in the concave groove of the duct 13. The cleaning body collected in the concave groove of the duct 13 rolls along the slope of the duct 13, passes through the lower end of the joint near the center of the fluid passage, and is reliably collected in the cleaning body extraction pipe 14.

When the diameter of the body 11 becomes larger and the width of the collection grid 12 becomes larger, the cleaning body extraction tubes 14 are arranged in a W-shape as shown in FIG. 414 instead of FIG. It is also possible to install it on both sides of 11.

Also, due to the enlargement of the diameter of the body 11, the collection grids 12 are changed from a V-shape of 2-piece set 1 to a W-shape of 4-piece set, as shown in FIG. 15 instead of FIG. 8. Arrange, fuselage 1
It is also possible to shorten the length of 1.

As is clear from the configuration and operation described above, this embodiment has the following advantages and disadvantages.

In other words, since the collection grid with the countersunk surface structure of this embodiment is composed of one stage, the body length L3 is reduced to about half that of the conventional type, which requires two stages of upstream and downstream grids. Since the number of parts can be reduced, the manufacturing cost of the entire device can be reduced compared to the conventional method. Furthermore, for the above-mentioned reasons, the size of the cleaning body collection device can be reduced, and the overall weight can be significantly reduced, making it easier to transport and install the device on-site. Furthermore, the mechanism for swinging the collection grid only needs one stage. Moreover, compared to the conventional m and VC in which the downstream grid surrounding plate 8 is installed in the fluid passage, the present invention has a cleaning body extraction pipe 14.
pressure loss can be significantly reduced.

In addition, as shown in FIG. 3, in the conventional type, the cleaning body extraction pipe 14 is located on the wall side of the body 11, and the collection grid 12 is reinstalled 2115 times per set. Collection grid 1
Since one cleaning body extraction pipe 14 is installed for one set of cleaning body extraction pipes 14, the amount of extracted water can be reduced by half, the ball circulation pump response t can be made small, and the auxiliary machine power can be reduced.

Therefore, according to the present invention, the cleaning body for a tubular heat exchanger can shorten the body length necessary for collecting the cleaning body, is easy to transport and install on-site, and can reduce pressure loss. What if the collection device could be easily manufactured? Since the amount of extracted water is small, it is possible to reduce the power of auxiliary equipment, and furthermore, the cleaning body can be extracted smoothly and the collection efficiency can be completely improved.

[Brief explanation of drawings]

Figure 1 is a vertical FfT view showing one row of conventional cleaning body collection devices for tubular heat exchangers, Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 is a recently devised one.・A vertical cross-sectional view of the cleaning body collection device for an α-type heat exchanger, FIG. 4 is a cross-sectional view taken along the line B-E in FIG. 3, FIG. 5 is a cross-sectional view taken along the line C-C in FIG. 3, 6th
The figure is a cross-sectional view taken along line E-E in Figure 4, Figure 7 is a longitudinal cross-sectional view of a cleaning body collection device showing an embodiment of the present invention, and Figure 8 is a cross-sectional view taken along line F-F in Figure 7. A cross-sectional view along FIG. 9 is G- in FIG. 7.
10 is a sectional view taken along line H-H in FIG. 8, FIG. 11 is a sectional view taken from Q in FIG.
Figure 2 is an enlarged view of the P section in Figure 1O, Figure 13 is an enlarged view of the constant piece 21 shown in Figure 12, Figures 14 and 15.
The figure is a longitudinal sectional view showing a cleaning body collecting device according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 11... Body, 12... Collection grid, 14... Cleaning body extraction, 13... Duct, 15... Collection grid axis, 1
6... Collection grid handle, 17... Side plate guide plate.ゝ:L+,::j,'lha''- Rate l mouth 2nd bacterium Ha'' Rate 3rd eye 4th mouth/j1 year 5th year 5th year 7th eye 8th country camellia 9th figure Shino io rn dream /I eye

Claims (1)

[Scope of Claims] 1. Installed in a fluid passage to collect a cleaning body that cleans the inside of a heat exchanger tube of a heat exchanger, and facing a center line extending approximately on three sides of the fluid passage, The duct has at least one roof-like slope that has both side walls of the fluid passage as the top and descends toward the center of each other, and further has a concave cross section that opens toward the upstream side of the fluid, and A large number of plate-shaped beams, which are swingably supported opposite to each other and whose lower ends are located near both side edges of the duct, are arranged side by side at appropriate intervals and expand toward the upstream side. The upper ends of these rods are connected to a pair of collection gratings which are almost in contact with the inner wall of the fluid passage, and a cleaning body extraction pipe connected to the collective lower end of the duct near the center of the fluid passage. In the cleaning body collection device for a tubular heat exchanger, the side surfaces of each pillar plate of the collection grid are made parallel to the streamlines, and the surface formed by connecting the upstream faces of the arranged pillar plates is 3. By combining at least two surfaces of lattices arranged to form a dimensional curved surface, and combining them so that the surfaces have a certain angle to each other and form a V-shape, the cleaning body can be attached to the two three-dimensional curved surfaces and the lower end. A tubular heat exchanger (floating/floating body collection device) characterized by having a collection grid that can collect the heat to at least one point using only a duct in the section.2. In order to be parallel to the streamlines, distant pieces are arranged in which the inclination angle between the distant rod and the end face of the plane connecting the upstream surface of the collection grid column plate differs depending on the position in the longitudinal direction of the column plate. A mechanical heat exchanger according to claim 1, characterized in that:
Pot resting nest device.