JP2876066B2 - Cleaning body recovery device for tubular heat exchanger - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for cleaning the inside of a heat transfer tube in a tubular heat exchanger, and more particularly, to a device for cleaning a cleaning body such as a spherical elastic ball for cleaning. The present invention relates to a cleaning device that passes through a heat pipe, and particularly to a cleaning body recovery device of a cleaning device used for a small-sized tubular heat exchanger.

(Prior art) Conventionally, as a heat exchanger or a condenser for a refrigerator, a tubular heat exchanger in which a number of heat transfer tubes are arranged has been used. Generally, fresh water is used, but in some cases, seawater is used.

And if you use this tubular heat exchanger for a long time,
Deposits such as scales and algae are generated on the inner wall of the heat transfer tube,
Since the heat exchange rate gradually decreases, it is necessary to periodically remove these deposits.

As a method of cleaning the inner wall of the heat transfer tube in this tubular heat exchanger, for example, a sponge ball having a diameter slightly larger than the inner diameter of the heat transfer tube is used as a cleaning body, and the sponge ball is forcibly passed through the heat transfer tube. There is a known method for removing deposits,
For example, large-scale facilities such as thermal power plants often have dedicated large-scale facilities for performing such a method.

An outline of a conventional cleaning apparatus using such a sponge ball as a cleaning body is described in, for example, JP-A-63-143497. In this conventional apparatus, the cooling water containing the washing body discharged from the outlet of the heat exchanger is divided into an outlet cooling water containing no washing body and a branch flow containing the washing body by a sieving device. The water is led into the outlet cooling water by a pump, while the water is received in the separator in a water blocking state, and then the pipe is switched and the water is discharged by the pump. Cleaning is performed by repeating the introduction into the cooling water at the inlet of the heat exchanger.

By the way, in the method of cleaning a tubular heat exchanger using a spherical cleaning body as described above, the cleaning body to be used may become small or damaged due to abrasion or the like over time, so that the recovery, It is necessary to manage the replacement and replenishment periodically.

As a device suitable for performing such management, a cleaning device is usually provided with a recovery device for the cleaning body, and proposals regarding such a recovery device have been made. For example, in Japanese Patent Application Laid-Open No. 61-89499, an inlet connection pipe and an outlet connection pipe are provided in a spherical casing, and a filter rotatable by a driving device provided at a position inclined by 120 ° with respect to the outlet connection pipe is placed between them. At the time of washing body recovery, the filter is moved by the driving device so that the filter is located between the outlet and the inlet of the spherical casing, and after the washing body and carrier water are separated by this filter, the filter is removed. The cleaning body is moved to the position of the discharge port to discharge the cleaning body to the outside together with the water flow, and only the cleaning body is taken out.

In addition, according to JP-B-62-501301 and JP-B-62-501302, a supply pipe and a discharge pipe which can be opened and closed by a flap are provided on a cylindrical container body, and a cutout is provided between the supply pipe and the discharge pipe. There has also been proposed a collecting device of a type provided with a sieve plate and a slider provided on the lower side of the sieve plate to open and close a notched portion. In this recovery device, during cleaning, the slider is moved to open the notch and the cleaning body is circulated together with the water flow, and after the cleaning is completed, the notch is closed by moving the slider to recover the cleaning body. Then, the cleaning body is collected on the sieve plate, and then the slider is moved to open the notch portion and the cleaning body is taken out from the discharge pipe.

(Problems to be Solved by the Invention) However, the recovery device used in the above-described conventionally proposed cleaning device has the following problems.

For example, in the former recovery device using a spherical casing, the filter must slide on the spherical inner wall to circulate the cooling water and recover the cleaning body. There is a drawback that the filter cannot be moved because the easily deformable cleaning body is interposed therebetween. In addition, since the discharged cleaning body must be separated from the cooling water, there is a problem that a separate device, apparatus, and the like are required.

On the other hand, in the latter collecting device in which the flap is provided in the cylindrical container body, the drawback that the easily deformable cleaning body is sandwiched and the slider does not move when the notch portion of the sieve plate is opened and closed by the slider as described above. There is. In addition, when a window for observing the inside from the outside is provided so that inspection can be performed, it is difficult to realize easy inspection because there are many blind spots because there is a drive shaft that operates sliders and flaps. There are also problems.

As described above, in the cleaning method in which the sponge balls are forcibly passed through the heat transfer tubes of the heat exchanger, there is a high need for replacement, replenishment and inspection of the cleaning body, and it is desirable that the maintenance and management thereof be easy. On the other hand, various problems to be improved remain as described above.

The present invention has been made in view of such circumstances,
An object of the present invention is to provide a recovery apparatus which has a very simple structure and is effective for improving the cleaning efficiency of continuous cleaning.

Another object of the present invention is that there are substantially no moving parts,
Accordingly, it is an object of the present invention to provide a recovery device which can avoid a failure caused by sandwiching an easily deformable cleaning body which has been a problem in the related art.

Still another object of the present invention is to provide a cleaning device for collecting a cleaning body that can easily and surely recover the cleaning body and that is easy to maintain and inspect.

Still another object of the present invention is to eliminate the movable parts as described above so that most of the collecting device can be formed of a synthetic resin material, thereby improving the durability and rust resistance of the device. The goal is to achieve miniaturization and weight reduction.

(Means and Actions for Solving the Problems) A feature of the washing body recovery apparatus for a tubular heat exchanger of the present invention that achieves the above object is that a spherical washing for heat exchanger washing with a tubular heat exchanger is provided. A washing body recovery device provided in a washing device that supplies and receives a body, and is disposed in the middle of a pipeline that conveys the washing body by a water flow, and a fixed space is defined below the conveyance water flow. A container body provided to be formed, a mesh basket provided so as to be able to be taken out in this space, and a turbulent flow forming means which is provided in the container body and causes a turbulence extending to the inside of the mesh in the transport water flow. And a drain pipe provided to be able to drain from the lower part of the container body through the net basket.

In the above configuration, the turbulent flow is formed by, for example, setting the connection position of the upstream pipe and the connection position of the downstream pipe of the transport water flow to the container body of the recovery device to be non-opposing positions, or forming the transport water flow. It can also be achieved by providing a baffle plate at the position where the water flows to disturb the water flow. In the case of draining from the lower part of the container body through a net basket, this can be drained to the outside of the washing device.However, when it is necessary to omit the drainage due to the installation location, etc. May be connected to each other so as to be joined to a pipeline through which the carrier water flows.

Further, as apparent from the above configuration, the recovery device of the present invention does not have a movable portion, so that it can be easily configured using a synthetic resin material.

A cleaning body used in the cleaning apparatus to which the present invention is applied typically includes a sponge ball.

(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 apparatus to which the cleaning body recovery apparatus of the present invention is applied. In this figure, reference numeral 1 denotes a tubular heat exchanger, and cooling water taken in from a cooling water inlet pipe 2 is shown. In the upper half of the heat exchanger 1, the heat flows in the heat transfer tube (not shown) to the right in the figure, and in the lower half, flows in the heat transfer tube (not shown) to the right in the figure and exits. 3 flows downstream of the heat exchanger and passes through the collector 10 to the cooling water outlet pipe 3.
Is drained out of the system. Collector 10
Is for collecting sponge balls as a washing body to be described later, and a tiltable lattice plate 10a is provided inside, and during normal cooling, the lattice plate 10a is in a posture parallel to the flow of cooling water. In order to facilitate the flow of water and scales that may be included in the water to the downstream, and to collect sponge balls during cleaning and return them to the cleaning device,
As shown in the figure, the lattice plate 10a is inclined so as to restrict the sponge balls from flowing to the cooling water outlet side.

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. The details of the collecting device will be described later.

21 is a check valve provided in the middle of the bypass line, 17 is a conduit
It is a sight glass interposed in the middle of 32, and it is possible to visually confirm that a sponge ball passes through the pipeline.

 The operation of the cleaning device having the above configuration will be described.

In the system shown in the drawing, cooling water is normally extended 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 10a of the collector 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 of the collector is opened.
Tilt 10a as shown. In addition, the three-way valve 16 is designed to allow water to flow through 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 transported by the pump 13 as a carrier water stream from the conduit 19 through the collector 15, and further through the conduit 33, the three-way valve 16 and the conduit 32 through the heat exchanger. Flow into the upstream cooling water inlet pipe 2. At this time, if a predetermined number of sponge balls are placed in the mesh basket of the recovery unit 15, the sponge balls are introduced into the cooling water inlet pipe 2 from the conduit 32 with the passage of the transport water flow, and the heat is transferred to the heat exchanger. Removal of the desired deposit is performed through the inside of the heat tube.

The sponge balls passing through the heat exchanger 1 return to the pump 13 through the collector outlet valve 11 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 transport stream, or to prevent the circulating sponge balls from dropping and staying in the same mesh basket, the collecting device 15 has a container. Therefore, it is necessary to cause the turbulence of the transport water flow. For example, the turbulent flow can be given by providing a baffle for water flow in the container body, or by displacing and connecting conduits 19 and 32 connected to the container body.

After the washing is completed, the three-way valve 16 is switched to the position where the bypass side is connected, so that the carrier water flows through the conduit 19, the recovery unit 15, the bypass line 22, and the three-way valve 16. As a result, the sponge balls flowing along with the transport water flow accumulate in the net basket of the recovery device 15, while the water flows between the sponge balls 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 shutting off both,
By opening the 15 lids, the sponge balls can be easily taken out, replaced, and refilled.

Next, the structure of the recovery unit, which is a characteristic part of this example, will be further described.

The detailed structure of the recovery unit 15 of this embodiment is shown in FIGS. That is, the recovery unit 15 is a vertical circular cylindrical container body.
A pair of circulating water inlet pipes 152 and a circulating water outlet pipe 153 are connected to a vertical intermediate portion of the 151, and the circulating water inlet pipe 152 is connected to the flexible conduit 19 described in FIG. The circulating water outlet pipe 153 is connected to the conduit 33.

The pair of circulating water inlet pipe 152 and circulating water outlet pipe 153 are connected to the container body 151 at non-opposing positions as shown in FIG. 2 so as to cause disturbance in the transport water flow.

A vertically circular cylindrical container body 151 having the pair of circulating water inlet pipes 152 and circulating water outlet pipes 153 connected to an intermediate portion in the vertical direction.
A mesh basket 154 is installed at the bottom inside. The mesh basket 154 prevents the passage of sponge balls, but is not particularly limited in its shape and the like as long as it allows water to pass therethrough. For example, a basket made of stainless steel wire may be used. As shown in (1), the basket may be of a type in which a large number of holes are provided by punching in a pot type. In this embodiment, the mesh basket 154 is provided with a pair of handles 1541 extending upward to facilitate removal from the container.

An outlet pipe 155 is connected to a bypass pipe provided at the bottom of the container body 151, and is connected to the bypass pipe 22 described in FIG. When the carrier water flow is passed through the bypass conduit 22, it is necessary to ensure the recovery of the sponge balls by flowing all the carrier water flow through the mesh basket 154.Therefore, the inner wall of the container body 151 and the It is preferable to provide a gap between the outer periphery of the mesh basket 154 provided at the bottom and a seal 1542 made of soft rubber or the like shown in FIG. 1, for example.

156 is a lid attached to the upper part of the container body 151,
The upper part of the container body 151 can be opened at appropriate times by screwing. Note that the top surface of the lid 156 in this example is an opening 1561, and the transparent plate 15 installed on the upper part of the container body.
By forming a see-through window through 62, the situation inside the collection device 15 can be easily observed from the outside.

158 is an O-ring that presses against the transparent plate 1562 to hermetically seal the inside and outside of the container body 151, and 159 is a deaeration hole.

The operation of the recovery device of the present example having the above configuration will be described.
The most characteristic feature of the apparatus of this embodiment is that the recovery unit of this embodiment has no moving parts, and the state is switched between when washing and when collecting the washing body by switching the flow of the transport water flow. This is because the transport water flow is changed from the conduit 19 to the three-way valve 16 through the conduit 33 by the switching of the three-way valve 16 as described with reference to FIG. The feature of the present embodiment is explained by the fact that the state of flow of the carrier water flowing through the inside of the recovery unit 15 is completely different between the state of reaching the three-way valve 16 through 22.

That is, during cleaning, the transport stream flows from conduit 19 through the collector to conduit 33, three-way valve 16 and conduit 32. On this occasion,
The generation of turbulence in the transport water flow so that sponge balls do not remain in the net basket 154 is as described above, and the sponge balls are continuously settled with the cleaning device without being settled or retained in the recovery device 15. Circulated between exchangers.

On the other hand, when the sponge balls as the washing body are collected, the carrier water flow is caused to flow through the bypass pipe 22, so that the sponge balls flowing along the carrier water flow are collected in a net basket.
Accumulate at 154 sequentially.

Then, according to the apparatus of this example, after a lapse of a predetermined time after the switching of the transport water flow, all of the sponge balls are stored in the net basket. Shut off both outlet valves 11 and collect
If the 15 lid 156 is removed, the sponge ball can be easily taken out by taking out the net basket.

Also, the device of this example has no movable parts in the collection device,
There is also an advantage that it is possible to easily observe the inside of the collection device through a see-through window including the opening 1561 and the transparent plate 1562.

Further, as described above, since the recovery unit has no moving parts and is simple in structure, the entire recovery unit can be formed of a rust-resistant and rust-resistant member, particularly a member made of synthetic resin. This is also useful for improving the durability and reducing the weight of the entire apparatus.

(Effects of the Invention) As described above, the cleaning body recovery device applied to the cleaning device for a tubular heat exchanger according to the present invention has an extremely simple structure and is effective in improving the cleaning efficiency of continuous cleaning. There is an effect that is.

In addition, there is substantially no movable part, which also has the effect of avoiding a failure caused by sandwiching the easily deformable cleaning body, which has conventionally been a problem.

Furthermore, there is an effect that the cleaning body can be easily and reliably recovered, and therefore, a cleaning body recovery device that can be easily maintained and inspected can be provided.

In addition, by eliminating the movable parts as described above, most of the recovery unit can be made of rust-resistant and rust-resistant material such as synthetic resin, thereby improving the durability and rust resistance of the device and miniaturizing it. Also, there is an effect that the weight can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal section showing an outline of the configuration of a recovery apparatus according to one embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a cleaning apparatus for a tubular heat exchanger to which the recovery apparatus of the present invention is applied. FIG. 3 is a diagram showing an example of the configuration outline of the configuration in a flow. 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 151 ... container body, 152 ... circulating water inlet pipe 153 ... circulating water outlet pipe, 154 ... net basket 155 ... ... outlet pipe, 156 ... lid

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

Claims (4)

(57) [Claims] 1. A cleaning apparatus for supplying and receiving a spherical cleaning body for cleaning a heat exchanger between a pipe-type heat exchanger and an intermediate part of a pipe for conveying the cleaning body by a water flow. A cleaning body collection device arranged, comprising: a container main body provided to form a certain space below a transport water flow; a net basket installed removably in this space; and the container main body And a turbulence forming means for causing a turbulence of the transport water flow to reach the inside of the net basket, and a drain pipe provided so as to be able to drain from the lower part of the container body through the net basket. Washing body recovery device for heat exchangers. 2. The cleaning body recovery device for a tubular heat exchanger according to claim 1, wherein the cleaning body is a sponge ball. 3. The configuration according to claim 1, wherein the turbulence forming means has a pipe connection position on the upstream side of the transport water flow with respect to the container main body of the recovery device and a pipe connection position on the downstream side in a non-opposing position. A washing body recovery device for a tubular heat exchanger. 4. A cleaning body recovery device for a tubular heat exchanger according to claim 1, wherein the container body is made of a synthetic resin.