JP2865373B2 - Cleaning body collecting device for tubular heat exchanger - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a collecting device applied for washing a tubular heat exchanger.

(Prior art) In a heat exchanger used for a condenser or an air conditioner in a power plant or the like, deposits such as scales and algae adhere to the heat transfer tubes of a tubular heat exchanger through which cooling water passes, and the aging occurs. In some cases, the heat exchange rate may decrease.

In order to prevent a decrease in the heat exchange rate, cleaning of the inside of the heat transfer tube has been conventionally performed. A typical cleaning method for this purpose is an easily deformable cleaning body slightly larger than the inner diameter of the heat transfer tube. For example, a method is known in which a sponge ball is forcibly passed through a heat transfer tube to remove scale and the like attached to an inner wall thereof.

By the way, in such a method, in order to effectively use the cleaning body used for removing deposits in the heat transfer tube,
It is required to repeatedly use the cleaning body that has passed through the heat exchanger, and for this purpose, downstream of the heat exchanger, so as to supply and receive the cleaning body between the heat exchanger and the cleaning device. A mechanism for separating the cleaning body from the water stream carrying the cleaning body and returning the cleaning body to the cleaning device is essentially required.

Such collectors have already been proposed in conventional cleaning systems using sponge balls as cleaning bodies,
It has also been implemented in actual equipment.

Here, as for a conventional collector, for example, a collector in which a lattice plate is tiltably provided in a cylindrical main body container is known.

(Problems to be Solved) By the way, there is still room for improvement of the above-mentioned collector as a configuration that is required to be as small as possible, and there is still room for improvement. Consideration of rust was still insufficient.

The present invention has been made in view of the above, and it is an object of the present invention to provide a collecting device which is made as small as possible and can be formed easily.

(Means and Actions for Solving the Problems) A feature of the collector of the present invention, which has also been made to achieve the above object, is that it is disposed downstream of the tubular heat exchanger and flows in from the heat exchanger. Inlet for receiving the water flow that transports the washing body
A container body having a first outlet for discharging the water flow and a second outlet for branching and discharging a part of the water flow, and the cleaning body conveyed by the water flow flowing from the inlet; A cleaning body collecting device provided with a lattice plate that prevents flow to an outlet side but allows flow to a second outlet side, wherein the container main body includes a first body attached to the inlet, The first body and the second body provided with the outlets of the second outlet are provided in a structure that separates and fastens them, and the lattice plate is provided near the fastening flange of the first body or the second body. The structure is such that it is provided so as to be tiltable by the arranged shaft, and it is particularly preferable that the shaft can be formed of a synthetic resin material.

(Examples) The present invention will be described below based on examples shown in the drawings.

FIG. 3 is a flow chart showing the entire cleaning system to which the cleaning body collecting device of the present invention is applied.
Is a tubular heat exchanger, in which cooling water taken in from a cooling water inlet pipe 2 flows in a heat transfer tube (not shown) in the upper half of the heat exchanger 1 in a rightward direction in the figure, and flows downward. In the half part, it flows to the right in the heat transfer tube (also not shown) and exits 3
The water flows further downstream of the heat exchanger, and is discharged from the cooling water outlet pipe 3 through the collector 10 to the outside of the system. Note that the collector 10 will be described later.

Next, the cleaning device will be described. The cleaning device according to the present embodiment includes a pump unit A and an operation unit B.

Here, the pump unit A has a circulation pump 13 driven by a motor 30, pressurizes the water introduced from the collector 10 into the cleaning device via the collector outlet valve 11, and forms a transport water flow. Are sent to the operation unit B by a flexible conduit 19.

In the operation unit A, the flexible conduit 19 is connected to the collecting device inlet valve 14.
Is connected to the cooling water inlet pipe 2 upstream of the heat exchanger 1 via a three-way valve 16, a flexible conduit 32, and a ball press-in valve 31. It is connected.

In the present embodiment, the collecting device 15 is composed of a vertical cylindrical container main body, a lid capable of opening and closing the upper part of the container main body, and a net basket stored at the inner bottom of the container main body. The conduit 19 and the conduit 33 are connected to an intermediate portion of the container body.

A bypass pipe line 22 is connected from the bottom of the container body to the three-way valve 16. By switching the three-way valve 16, water is directly passed from the conduit 19 to the conduit 32 via the recovery unit 15, Whether or not water is allowed to pass through the bypass pipe 22 can be selected.

In addition, 21 is a check valve provided in the middle of the bypass pipe, and 17 is a sight glass provided in the middle of the pipe 32 so that a sponge ball can be visually confirmed passing through the pipe. I have.

Here, the collector 10 of the present example will be described. The collector 10 is for collecting sponge balls as a cleaning body. A cylindrical container main body 101 has an upper first body 102 and a lower second body 102. The first body 1 is provided separately from the body 103.
02 and the second body 103 are integrated by fastening the flange portions 102a and 103a formed respectively with bolts.
A grid plate 105 is provided inside the second body 103 so as to be tiltable by a shaft 104, and the grid plate 105 can be tilted during normal cooling.
Is placed in a position parallel to the flow of the cooling water to facilitate the flow of water and scales that may be contained in the water, and to collect the sponge balls during cleaning and return them to the cleaning device. As shown in the figure, 105 is tilted so as to restrict the sponge ball from flowing to the cooling water outlet side.

Note that, in order to facilitate the structure in which the end portion of the lattice plate 105 is engaged with the inner peripheral surface of the collector when the lattice plate 105 is tilted, in this example, the first body 102 and the lattice plate of the second body 103 are connected to each other. The engaging portion is formed to be rectangular in a horizontal cross section.

Next, the operation of the cleaning apparatus having the above configuration will be described.

In the system shown in the drawing, cooling water is normally flown from the cooling water inlet pipe 2 to the cooling water outlet pipe 3 with the ball press-in valve 31 and the collector outlet valve 11 shut off, and heat exchange is performed. . In this case, the grid plate 105 of the collector 10 is parallel to the flow of the cooling water.

Next, in order to clean the heat exchanger 1, the ball press-in valve 31 and the collector outlet valve 11 are opened, and the grid plate 105 of the collector 10 is tilted as shown in the figure. In addition, the three-way valve 16 is set so that water is supplied to the circulation conduits 19 and 32.

In this state, the motor 30 is driven, and a part of the cooling water from the collector 10 is passed from the collector 19 to the cooling water inlet pipe 2 upstream of the heat exchanger through the conduit 32 through the conduit 32 by the pump 13.
At this time, if a predetermined number of sponge balls are put in the net basket of the collecting device 15, the sponge balls are conveyed along with water flow.
From 32, it is press-fitted into the cooling water inlet pipe 2 and passes through the inside of the heat exchanger tube of the heat exchanger to remove the desired deposit.

The sponge balls passing through the heat exchanger 1 pass through the collector outlet valve 11 to the pump 13 and are circulated through the conduit 19. Therefore, in this state, the sponge balls continuously flow between the cleaning device and the heat exchanger, and quick and efficient cleaning can be realized. In addition, in order to put the sponge balls stored in the mesh basket of the collecting device 15 in the flow of water, or to prevent the circulating sponge balls from dropping and staying in the mesh basket, the collecting device 15 has a container. It is preferable to provide a device for causing turbulence in the container, for example, by providing a baffle plate for water flow in the container body, or by shifting the positions of the conduits 19 and 32 connected to the container body and connecting them. Can give turbulence.

After the washing is completed, the three-way valve 16 is switched to the position for connecting the bypass side, and the water is supplied to the conduit 19-the collector 15-the bypass line 22.
It is made to flow with the three-way valve 16. As a result, the sponge balls contained in the water flow accumulate in the net basket of the recovery device, and the water flow flows between the water exchanger and the heat exchanger along the above-described path. Therefore, all the sponge balls press-fitted into the heat exchanger are naturally stored in the net basket. After continuing this operation for a predetermined time, the pump 13 is stopped, and the ball press-fit valve 31 and the collector outlet valve 11 are stopped. After blocking both, the sponge ball can be taken out, replaced, or refilled easily by opening the lid of the collecting device 15.

In the above-described configuration, the collector 10 of the present embodiment simplifies the assembling work to assemble the rotation axis of the lattice plate near the flange of the divided second body, and has a divided structure as in the present embodiment. Accordingly, there is also an advantage that the collector can be formed by molding using a synthetic resin composite material such as FRP without requiring a complicated core or the like.

The collector according to the present invention is not limited to the above-described embodiment, and for example, the lattice plate may be an oval one.

(Effect of the Invention) As described above, the trapping device in the cleaning device for a tubular heat exchanger according to the present invention is obtained by dividing a main body having a cylindrical structure into upper and lower parts and fastening their flanges. Because it is made to be composed, the molding of the main body portion is facilitated, and especially, since it can be molded using a synthetic resin, it is effective for miniaturization, weight reduction, and improvement of rust resistance and rust resistance. There is an effect that the work of assembling the plate is facilitated and the workability of assembling is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a collector according to an embodiment of the present invention, FIG.
The figure is a diagram showing, by a flow, an example of a configuration outline of a cleaning device for a tubular heat exchanger to which the collector of the present invention is applied. 1 ... tubular heat exchanger, 2 ... cooling water inlet pipe 3 ... cooling water outlet pipe, 10 ... collector 11 ... collector outlet pipe, 13 ... circulation pump 15 ... collector, 16 ... three-way valve 19, 32 ... conduit, 31 ... ball press-in valve 101 ... container body, 102 ... first body 103 ... second body, 104 ... shaft 105 ... lattice plate

Continuing on the front page (72) Inventor Tadayoshi Osawa 348 Toyo, Kashiwa-shi, Chiba Prefecture Showa Rubber Co., Ltd. Kashiwa Plant (72) Inventor Teruo Nakajima 32-1 Senju Asahicho, Adachi-ku, Tokyo Showa Rubber Co., Ltd. (72) Inventor Takuya Sasaki 1-284, Funakoshi-cho, Yokosuka-shi, Kanagawa Prefecture 5 Hitachi Machine Engineering Co., Ltd. In-house (72) Inventor Makoto Yanagihara 5-284, Funakoshi-cho, Yokosuka City, Kanagawa 5 In-house Hitachi Machine Engineering Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) F28G 1/12

Claims (2)

(57) [Claims] An inlet disposed downstream of a tubular heat exchanger for receiving a water flow carrying a cleaning body flowing from the heat exchanger, a first outlet for discharging the water flow, and a portion of the water flow. A cleaning body conveyed by a water flow flowing from the inlet and a second main body having a second outlet for branching and discharging the second main body; A washing body collecting device provided with a lattice plate that allows the container body to flow, wherein the container body has a first body attached with the inlet, and a first body attached with outlets of the first outlet and the second outlet. A pipe which is provided in a structure for separating the two bodies and fastening them, and wherein the lattice plate is provided so as to be tiltable by a shaft arranged near a fastening flange of the first body or the second body. Washing body collection device for a heat exchanger. 2. The washing body collecting device for a tubular heat exchanger according to claim 1, wherein the container body and the lattice plate are made of synthetic resin.