JPH0413097A - Cleaning body recovering device for tubular heat exchanger - Google Patents

Abstract

PURPOSE:To improve cleaning efficiency and facilitate maintenance as well as inspection by a method wherein the title device is provided with a wire cage, equipped in the space of the main body of a vessel so as to be capable of being taken out, and a turbulent flow forming means, generating turbulence in the flow of water carrying washing bodies so as to be transferred into the wire cage. CONSTITUTION:Upon cleaning, water, carrying sponge balls, flows from a conduit 19 to another conduit 33, a three-way valve 16 and the other conduit 32 through a recovering device 15. In this case, turbulent flow is generated in the flow of water so that the sponge balls will never remain in a wire cage 154 and, therefore, the sponge balls are circulated continuously between a cleaning device and a heat exchanger without sinking or stagnating in the recovering device 15. On the other hand, upon recovering cleaning bodies or the sponge balls, the water flows through a bypass pipeline 22 and, therefore, the sponge balls, carried by the flow of water, are reserved in the wire cage 154 sequentially. When a predetermined period of time has elapsed after switching the flow of water, all of the sponge balls are received into the wire cage and, therefore, the wire cage can be taken out and the sponge balls can be taken out easily by stopping the driving of the pump, intercepting both of a ball forcing valve 31 and the outlet valve 11 of a ball collector and removing the lid 156 of the recovering device 15.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a device for cleaning the inside of a heat transfer tube in a tube heat exchanger, and more specifically, the present invention relates to a device for cleaning the inside of a heat transfer tube in a tube heat exchanger. A cleaning device that passes through the heat pipe,
In particular, the present invention relates to a cleaning body recovery device for a cleaning device used in a small-sized tubular heat exchanger.

(Prior Art) Traditionally, a tube heat exchanger with a large number of heat transfer tubes arranged has been used as a heat exchanger or condenser for refrigerators, and the cooling water in this tube heat exchanger is Generally fresh water is used, but sometimes sea water is used.

If this tubular heat exchanger is used for a long period of time, deposits such as scale and algae will form on the inner walls of the heat exchanger tubes, and the heat exchange rate will gradually decrease, so these deposits should be removed periodically. Work is required to remove it.

In order to clean the inner walls of the heat exchanger tubes in this tube heat exchanger, for example, a sponge ball with a slightly larger diameter than the inner diameter of the heat exchanger tubes is used as the cleaning body, and this is forcibly passed through the heat exchanger tubes to clean the inner walls of the tubes. Methods for removing deposits are known, and large-scale facilities such as thermal power plants, for example, often have dedicated large-scale equipment for carrying out such methods.

An outline of a conventional cleaning device using such a sponge ball as a cleaning body is described in, for example, Japanese Patent Laid-Open No. 143497/1983. In this conventional device, the cooling water containing the cleaning body discharged from the heat exchanger outlet is separated by a sieve device into the outlet cooling water not containing the cleaning body and the branch stream containing the cleaning body, and the branched flow is further passed through the separator. The cleaning body and water are separated, and the water is guided into the outlet cooling water by a pump, and the cleaning body is received in the separator with water flow cut off, and then the water is discharged by the pump by switching the pipe line. Cleaning is performed by repeatedly introducing the cooling water into the inlet of the heat exchanger.

By the way, in the method of cleaning a tubular heat exchanger that uses a spherical cleaning body as described above, the cleaning body used may become smaller or damaged due to wear over time, so it is necessary to collect it, Management such as regular replacement and replenishment is required.

And as a device suitable for such management,
Usually, the cleaning device is provided with a recovery device for the cleaning body,
Proposals regarding such a recovery device have also been made in the past.

For example, in JP-A No. 61-89499, a spherical casing is provided with an artificial connecting pipe and an outlet connecting pipe, and a filter rotatable by a drive device installed at a position inclined at 120 degrees with respect to the outlet connecting pipe is placed between them. When recovering the cleaning body, the filter is moved by the drive device so that it is located between the outlet and the inlet of the spherical casing, and after separating the cleaning body and the conveyed water with this filter, the filter is removed. The cleaning body is moved to the position of the discharge port and the cleaning body is discharged to the outside along with the water flow, so that only the cleaning body is taken up and pressurized.

Also, Special Publication No. 62-501301 and Special Publication No. 62-5
According to No. 01302, a cylindrical container body is provided with a supply pipe and a discharge pipe that can be opened and closed with a flap, and a sieve plate having a partial cutout between the supply pipe and the discharge pipe, and a cutout on the underside of the sieve plate. A collection device equipped with a slider that can open and close the notch has also been proposed. In this recovery device, during cleaning, the slider is moved to open the notch part and the cleaning body is circulated together with the conveying water flow, and after the cleaning grade is completed,
In order to collect the cleaning material, the notch is closed by moving the slider and the cleaning material is collected on the sieve plate, and then the slider is moved to open the notch and the cleaning material is taken out from the discharge pipe. There is.

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

For example, in the former recovery device using a spherical casing, the filter must slide on the spherical inner wall in order to circulate the cooling water and recover the cleaning body. There is a drawback that the easily deformable cleaning body is sandwiched between the filters and the filter does not move. Further, since the discharged cleaning body must be separated from the cooling water, there is also the problem that a separate device, instrument, etc. is required for this purpose.

On the other hand, in the latter collection device in which a flap is provided on the cylindrical container body, when the slider opens and closes the notch in the sieve plate, the easily deformable cleaning body gets caught in the same way as above, and the slider cannot be removed. There are some drawbacks. Also, when installing a window to observe the interior from the outside to enable inspection,
There are also problems in that there are many blind spots due to the presence of drive shafts that operate sliders and flaps, making it difficult to perform easy inspections.

In this way, the cleaning method of forcibly passing a sponge ball through the heat transfer tubes of a heat exchanger requires replacement, replenishment, and inspection of the cleaning body, and it is desirable that its maintenance and management be easy. However, as mentioned above, various problems remain that need to be improved.

The present invention has been made in view of the current situation, and its purpose is to provide a recovery device that has an extremely simple structure and is also effective in improving the cleaning efficiency of continuous cleaning.

Another object of the present invention is to provide a recovery device that has virtually no moving parts, thereby avoiding failures caused by the deformable cleaning body being caught between the bodies, which has been a problem in the past. .

Still another object of the present invention is to provide a cleaning body recovery device which allows cleaning bodies to be recovered easily and reliably, and which is therefore easy to maintain and inspect.

Furthermore, another object of the present invention is to eliminate movable parts as described above, so that most of the recovery device can be made of synthetic resin material, thereby increasing the durability and rust resistance of the device. The goal is to make it smaller and lighter.

(Means and effects for solving the problem) The feature of the cleaning body recovery device for a tubular heat exchanger of the present invention that achieves the above object is that a spherical cleaning device for cleaning the heat exchanger is installed between the tubular heat exchanger and the tubular heat exchanger. A cleaning body collection device that is installed in a cleaning device that supplies and receives bodies, and is interposed in the middle of a pipe that conveys the cleaned bodies with water flow, and forms a certain space below the conveying water flow. a container body disposed so as to move the vessel; a removably installed container within the space; a turbulent flow forming means provided within the container body for creating turbulence in the conveyed water flow extending into the container;
A drain pipe is provided so that water can be drained from the lower part of the container body through the drain pipe.

In the above configuration, turbulence can be formed by, for example, making the connection position of the upstream pipe line of the conveyed water flow and the connection position of the downstream pipe line with respect to the container body of the recovery device non-opposed, or by This can also be done by creating turbulence in the water flow by installing a baffle plate at the location where the water flows. In addition, the configuration in which water is drained from the bottom of the container body through the drain can be used to drain water to the outside of the cleaning device, but in cases where it is necessary to omit the drainage equipment due to the circumstances of the installation location, etc.
It is also possible to provide a connected pipe line so that the waste water flows into the pipe line through which the conveying water flow flows.

Furthermore, since the recovery device of the present invention does not have any movable parts, as is clear from the above structure, it can be easily constructed using a synthetic resin material.

The cleaning body used in the cleaning device of the present invention is typically a sponge ball.

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

FIG. 3 is a flow diagram showing the entire cleaning device to which the cleaning body recovery device of the present invention is applied. In the upper half of this heat exchanger 1, it flows inside the heat exchanger tubes (not shown) to the right in the figure, and in the lower half, it flows inside the heat exchanger tubes (also not shown) in the right direction in the figure. The cooling water flows downstream of the heat exchanger from the outlet 3 and passes through the collector 1o to the cooling water outlet pipe 3.
The water is then drained out of the system. In addition, collector 1
0 is for collecting sponge holes as a cleaning body to be described later, and a tiltable grating plate 10a is provided inside, and during normal cooling, this grating plate 10a is moved parallel to the flow of cooling water. In addition to making it easier for water to flow and for scale, etc. that may be contained in it to flow downstream,
During cleaning, in order to collect the sponge balls and return them to the cleaning device, the grid plate 10a is tilted as shown in the figure so as to restrict the outflow of the sponge balls toward the cooling water field side.

Next, the cleaning device will be explained. The cleaning device of this example is composed of a pump unit A and an operation unit B.

Here, the pump unit A has a circulation pump 13 driven by a motor 30, and pressurizes the water introduced from the collector 10 to the cleaning device via the collection amount outlet valve 11 and converts it into a conveying water stream. , operating unit B by flexible conduit 19
It is supposed to be sent to

In the operation unit A, the flexible conduit 19 is connected to the collector artificial valve 1.
4 to a recovery device 15, and this recovery device 1
The conduit 33 from 5 is connected to the cooling water artificial pipe 2 upstream of the heat exchanger 1 via the three-way valve 16, the flexible conduit 32, and the ball press-fit valve 31.

In this example, the recovery device 15 is made up of a vertical cylindrical container body, a lid that can open and close the upper part of the container body, and a cap that is housed in the inner bottom of the container body. The conduit 19 and the conduit 33 are connected to the intermediate portion of the main body. A bypass pipe 22 is connected from the bottom of the container body to the three-way valve 16, and by switching the three-way valve 16, the pipe 19 is directly connected to the pipe 32 via the collector 15.
It is possible to select whether to allow water to flow through the bypass pipe 22 or to flow water through the bypass pipe 22. The details of the recovery device will be described further later.

Reference numeral 21 indicates a check valve interposed in the middle of the bypass conduit, and 17 indicates a sight glass interposed in the middle of the conduit 32, so that passage of the sponge ball through the conduit can be visually confirmed. .

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

In the system shown in the drawings, normally, with the ball press-in valve 31 and the collected amount outlet valve 11 shut off, the cooling water flows from the cooling water inlet pipe 2 to the cooling water outlet pipe 3, and heat exchange is performed. . At this time, the grid plate 10a of the collector is parallel to the flow of cooling water.

Next, in order to clean the heat exchanger 1, the ball press-in valve 31 and the collected amount outlet valve 11 are opened, and the grid plate 10a of the collector is tilted as shown. The three-way valve 16 also allows water to flow through the circulation conduit 19.32.

In this state, the motor 30 is driven, and the pump 13 transports a portion of the cooling water from the collector 10 to the collector 15 through the conduit 19, and then through the conduit 33, the three-way valve 16, and the conduit 32 to the heat exchanger. It flows into the upstream cooling water artificial pipe 2. At this time, if a predetermined number of sponge balls are placed inside the drain of the recovery device 15, the sponge balls will be introduced from the conduit 32 into the cooling water inlet pipe 2 as the conveyed water flow passes through the heat exchanger. The target deposits are removed through the inside of the heat tube.

The sponge balls that have passed through the heat exchanger 1 are returned to the pump 13 through the catch outlet valve 11 and circulated through the conduit 19. Therefore, in this state, the sponge balls continuously flow between the cleaning device and the heat exchanger, allowing for rapid and efficient cleaning. In addition, in order to place the sponge holes stored in the collection container 15 on the conveying water flow, or to prevent the circulating sponge balls from falling into the collection container and staying there, the collection device 15 is transported in a container. It is necessary to create turbulence in the water flow. For example, the above-mentioned turbulent flow can be provided by providing a baffle plate for water flow inside the container body or by connecting the conduit 1!1.32 connected to the container body at a different position.

After cleaning is completed, the three-way valve 16 is switched to a position connecting the bypass side, so that the conveyed water flow flows through the conduit 19, the recovery device 15, the bypass line 22, and the three-way valve 16. As a result, the sponge balls flowing with the conveying water flow are collected in the collector 15.
On the other hand, water will flow between the heat exchanger and the heat exchanger through the above route. Therefore, the sponge balls that have been press-fitted into the heat exchanger will naturally be stored in the reservoir, and after this operation is continued for a predetermined period of time, the pump 13 is stopped, and the ball press-in valve 31 and the collected amount outlet valve are closed. 11 and then open the lid of the recovery device 15 to easily take out the sponge balls, replace them, and replenish them.

Next, the structure of the collector, which is a characteristic part of this example, will be further explained.

The detailed structure of the collector 15 of this example is shown in FIGS. 1 and 2. That is, the recovery device 15 includes a pair of circulating water population pipes 15 in the vertically intermediate portion of a container body 151 having a vertical circular cylindrical shape.
2 and a circulating water outlet pipe 153, of which the circulating water inlet pipe 152 is connected to the flexible conduit 19 described in FIG. 3, and the circulating water outlet pipe 153 is connected to the conduit 33.

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

A refill 154 is installed at the bottom of the vertical circular cylindrical container main body 151 to which the pair of circulating main inlet pipes 152 and the circulating water outlet pipe 153 are connected to the vertically intermediate portion. The shape of this writing brush 154 is not particularly limited as long as it blocks the passage of the sponge ball but allows water to pass through. For example, it may be a basket made of stainless steel wire,
As shown in FIG. 1, it may be a pot-shaped basket with a large number of holes punched into it. The pen 154 in this example is provided with a pair of handles 1541 extending upward to facilitate removal from the container.

155 is an outlet pipe connected to a bypass line provided at the bottom of the container body 151, and is connected to the bypass line 22 described in FIG. 3. Note that when the conveyance water flow is passed through the bypass pipe line 22, all the conveyance water flow is
It is necessary to reliably collect the sponge balls by flowing through the container body 151, and for this purpose, between the inner wall of the container main body 151 and the outer periphery of the refill 154 installed at the bottom thereof, a soft It is preferable to provide a seal 1542 made of rubber or the like so as to close it.

Reference numeral 156 denotes a lid attached to the upper part of the container body 151, and is screwed into the lid so that the upper part of the container body 151 can be opened at any time. Note that ii 156 in this example
The top surface of the container 15 is an opening 1561, and a see-through window is formed through a transparent plate 1562 installed at the top of the container body, so that the situation inside the collector 15 can be easily observed from the outside.

158 is an O-ring 159 that airtightly seals the inside and outside of the container body 151 by coming into pressure contact with the transparent plate 1562;
is a vent hole.

To explain the operation of the recovery device of this example having the above configuration, the most representative feature of this device is that the recovery device of this example has no moving parts and is able to switch the conveyed water flow. The state is switched between the time of cleaning and the time of recovery of the cleaning body, and this is because, as explained in FIG. The state during cleaning and the conveying water flow are transferred to the conduit 19.
The characteristic of this example can be explained by the fact that the flow conditions of the conveyed water flow inside the collector 15 are completely different in the state where the water flow passes through the bypass pipe 22 and reaches the three-way valve 16.

That is, during cleaning, the conveying water stream flows from conduit 19 through the collector to conduit 33 - three-way valve 16 - conduit 32. At this time, as mentioned above, turbulence is created in the conveying water flow so that no sponge holes remain in the cotton volume 154, and the sponge holes are continuously maintained in the collector 15 without settling or stagnation. is circulated between the cleaning equipment and the heat exchanger.

On the other hand, when collecting the sponge holes that are the cleaning body, the conveying water flow is made to flow through the bypass pipe 22, so the sponge holes that flow along with this conveying water flow are
54 in sequence.

According to the device of this example, after a predetermined period of time has elapsed after switching the conveying water flow, all of the sponge balls will be stored in the pump, and therefore, at that point, the drive of the pump will be stopped and the ball press-in valve 31 and the collector outlet By shutting off both valves 11 and removing the M156 of the recovery device 15, the sponge ball can be easily taken out to the outside by taking out the tip.

Furthermore, the device of this example has the advantage that since there are no moving parts in the recovery device, the situation inside the recovery device can be easily observed through the see-through window consisting of the opening 561 and the transparent plate 1562.

Furthermore, as mentioned above, the collector has no moving parts and is structurally simple, so the entire collector can be made of rust-resistant and rust-resistant materials, especially synthetic resin members. Therefore, it is useful for improving the durability and reducing the weight of the entire device.

(Effects of the Invention) As described above, the cleaning body recovery device according to the present invention, which is commonly used in cleaning devices for tubular heat exchangers, has an extremely simple structure and is also effective in improving cleaning efficiency through continuous cleaning. There is an effect that

Additionally, there are virtually no moving parts, which makes it possible to avoid failures that would otherwise occur due to the easily deformable cleaning body being caught in the cleaning body.

Furthermore, it is possible to easily and reliably recover the cleaning body, thereby providing a cleaning body recovery device that is easy to maintain and inspect.

Furthermore, by eliminating moving parts as mentioned above, most of the recovery device can be made of rust-resistant and rust-resistant materials such as synthetic resin, making the device more durable and rust-resistant, and also making it more compact and more compact.
It also has the effect of reducing weight.

[Brief explanation of drawings]

Fig. 1 is a vertical cross section showing an outline of the configuration of a recovery device according to an embodiment of the present invention, Fig. 2 is a plan view thereof, and Fig. 3 is a cleaning device for a tubular heat exchanger to which the recovery device of the present invention is applied. FIG. 7 is a diagram illustrating an example of the configuration overview in a flowchart.

Claims (1)

[Scope of Claims] 1. Provided in a cleaning device that supplies and receives a spherical cleaning body for cleaning the heat exchanger between the tubular heat exchanger and in the middle of a pipe line that conveys the cleaning body with water flow. A cleaning body recovery device interposed therein, comprising: a container body provided to form a certain space below with respect to the conveying water flow; a mesh basket removably installed within this space; It is characterized by comprising: a turbulent flow forming means disposed within the container body to cause turbulence in the conveyed water flow extending into the mesh basket; and a drain pipe provided so as to drain water from the lower part of the container body through the mesh basket. Cleaning body recovery device for tubular heat exchangers. 2. A cleaning body recovery device for a tubular heat exchanger according to claim 1, wherein the cleaning body is a sponge ball. 3. Claim 1, characterized in that the turbulent flow forming means is configured such that the pipe connection position on the upstream side of the conveyed water flow and the pipe connection position on the downstream side with respect to the container body of the recovery device are in non-opposing positions. Cleaning body recovery device for tubular heat exchangers. 4. The cleaning body recovery device for a tubular heat exchanger according to claim 1, wherein the container body is made of synthetic resin.