JP2010236819A - Cleaning device of heat exchanger heat transfer tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning device of a heat exchanger heat transfer tube improving heat exchanging capacity by effectively cleaning an inner face of the heat exchanger heat transfer tube at low cost with a simple structure not using an expensive automatic control valve and the like. <P>SOLUTION: When a circulation pump 2c is operated, the split-flow cleaning water is pressure-fed to a cleaning water injection pipe 21 of a cleaning member supply section 2a, a movable plate 24 is raised by jetting force of the cooling water injected from the cleaning water injection pipe 21, and an opening 28a of a bottom plate section 28 of a cleaning member recovering section 2b is closed. Thus the spherical cleaning members SB accumulated at a lower part of the cleaning member supply section 2a is distributed to a cooling water supply pipe 3 from a cleaning member injection pipe 31 through a check valve 5 and an inflow pipe conduit 6, and the spherical cleaning members SB passing through the heat transfer tube 1p and returned to the cleaning member recovering section 2b from a cleaning member separating section 4b of a cooling water discharge pipe 4 through a cleaning member split-flow pipe conduit 7 is collected in a sieve basket (sieve cylinder 27+ movable plate 24). When all of the spherical cleaning members SB are collected in the sieve basket, and the circulation pump 2c is stopped, the device is returned to an original state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat exchanger heat exchanger tube cleaning device for cleaning and removing foreign matters adhering to the inner surface of a heat exchanger tube of a tubular heat exchanger such as a steam turbine condenser or a refrigerator condenser using cooling water.

  Conventionally, in tubular heat exchangers such as steam turbine condensers, refrigerator condensers, and chemical devices, tubular heat exchangers in which a large number of straight tubular heat transfer tubes are arranged have been used. Cooling water is used for heat exchange. Examples of the cooling water include fresh water and seawater. When the operation is performed using the cooling water in the heat exchanger as described above, foreign matters such as dust, algae, calcium, silica, etc. in the cooling water act to promote the contamination on the inner surface of the heat transfer tube. As a result, the heat transfer coefficient of the heat exchanger decreases, resulting in a decrease in condenser vacuum, a decrease in refrigeration function, etc., and an increase in head loss of heat transfer tubes.

  For this purpose, the inner surface of the heat transfer tube must be cleaned as necessary. As a conventional heat transfer tube cleaning method, as shown in Patent Documents 1 and 2, there is a technique for removing contaminants such as algae from the tube wall of a heat transfer tube by flowing a cleaning body such as a sponge rubber ball into the heat transfer tube. Are known.

Japanese Patent Publication No.59-26240 No. 8-630

  In the technique disclosed in Patent Document 1, a pump 105, a shutoff valve 106, and a collector 107 are inserted into a bypass passage 104 from the outlet passage 103 to the inlet passage 102 of the heat exchanger 100, and the collector 107 circulates. All sponge rubber balls (cleaning body) B can be held, and the bottom part is connected to the outlet 109 provided with the cleaning body circulation valve 110, and the bypass receives only the cooling water that has passed through the screen 108 provided at the bottom part. 111 is provided with a cooling water circulation dedicated valve 112. By the pump 105 and the shutoff valve 106, the sponge rubber ball (cleaning body) B is fed from the collector 107 through the valve 110 and the outlet 109 to the inlet passage 102 and passes through the pipe 101 of the heat exchanger 100. After being cleaned, the separation device 1 provided in the outlet passage 103 is recirculated to the bypass passage 104, the collector 107, and the inlet passage 102. In order to stop only the circulation of the ball, the cleaning body circulation valve 110 is closed, and the cooling water circulation dedicated valve 112 is kept open until all the sponge rubber balls B are accommodated in the collector 107. A part of the cooling water is recirculated. The pump 105 can then be stopped with the shutoff valve 106 closed.

  In the scale removing device in the heat exchanger tube shown in Patent Document 2, a ball separator 16 interposed in the middle of a discharge pipe 13 for leading out liquid (water, etc.) in the heat exchanger 11, and a liquid introduction The ball collector 17, the first valve 18, the ball reservoir 19, and the second valve 21 are sequentially connected to the supply pipe 12 through the branch pipe 22. The ball reservoir 19 is connected to the ball collector 17. , A feed pump 20 that forcibly feeds only the liquid from the ball collector 17 to the ball reservoir 19 is provided in parallel with the first valve 18. At the start of the descaling operation, a certain amount of cleaning ball 15 is stored in the ball collector 17 in advance. After the first valve 18 is opened and the cleaning ball 15 is placed in the ball reservoir 19, the first The valve 18 is closed (the second valve 21 is closed). Next, the feed pump 20 is operated, the second valve 21 is opened, and a large number of cleaning balls 15 are injected into the supply pipe 12 at once. The cleaning ball 15 injected into the supply pipe 12 enters the tube in the heat exchanger 11, removes the scale accumulated in the tube and cleans the tube, and then goes out into the discharge pipe 13. The cleaning balls 15 flowing in the discharge pipe 13 are collected by the ball separator 16 and sequentially returned to the ball collector 17. When each cleaning ball 15 reaches the ball collector 17, the second valve 21 is closed and the feed pump 20 is stopped.

  There are many obstacles in the conventional heat exchanger heat exchanger tube cleaning device. For example, in the technique of Patent Document 1, cooling water including a cleaning body such as a sponge ball is circulated by a pump in series with the bypass passage, so that there is an obstacle such as damage to the pump. In the scale removing device of Patent Document 2, the diverted water liquid is pumped using a feed pump dedicated to the water liquid, and the cleaning ball is injected into the supply pipe together with the diverted water liquid, so that damage to the pump can be prevented. It is not only necessary to provide an expensive automatic control valve between the ball collector and the ball reservoir or between the ball reservoir and the branch pipe. As a result, the cleaning ball is bitten or cut, and the cleaning ball is deformed, the cleaning power in the heat exchanger tube is reduced, the heat exchanging ability is lowered, the separation function in the ball separator is defective, and the There is also a complicated operability problem that the feed pump and each valve must be controlled in association with each other.

  In view of such circumstances, the present invention can effectively clean the inner surface of the heat exchanger heat transfer tube and improve the heat exchange capacity with a low-cost and simple structure that does not use expensive automatic control valves. It is an object of the present invention to provide a heat exchanger heat exchanger tube cleaning apparatus that can be used.

  According to the main feature of the present invention, the spherical cleaning body (SB) is passed through the plurality of heat transfer tubes (1p) arranged in parallel in the heat exchanger (1) and through which the cooling water flows, so that the inner surface of the heat transfer tube (1p) is passed. A heat exchanger heat transfer tube cleaning device for removing adhering foreign matter, which sends a spherical cleaning body (SB) to a heat transfer tube (1p) and passes the heat transfer tube (1p) through a spherical cleaning body (SB). The cleaning body circulation device (2) to be recovered, the check valve (5) for allowing the spherical cleaning body (SB) sent out from the cleaning body circulation device (2) to flow only in the delivery direction, and the check valve (5) The cleaning body injection pipe (31) for feeding the spherical cleaning body (SB) that has passed through the cooling water supply pipe (3) that guides the cooling water to the heat exchanger (1) through the inflow pipe (6). And separating the spherical cleaning body (SB) from the cooling water discharge pipe (4) for discharging the cooling water from the heat exchanger (1), A cleaning body separating section (4b) that sends back the separated spherical cleaning body (SB) together with a part of the cooling water ("divided cleaning water") to the cleaning body circulation device (2) through the cleaning body branch pipe (7). The cleaning body circulation device (2) includes a cleaning body delivery pipe (25) for sending out the spherical cleaning body (SB) from the lower side surface, a movable plate (24) movable upward in the center upper portion, and A cylindrical cleaning device having a cleaning water injection pipe (21) having a discharge port (22) toward the movable plate (24) and having a space for retaining a spherical cleaning body (SB) to be passed through the heat transfer pipe at the bottom. A bottom plate portion provided at the boundary between the body supply portion (2a) and the cleaning body supply portion (2a) and having an opening (28a) formed in the center thereof closed by a movable plate (24) moved upward. 28), provided on the bottom plate (28), and sent from the cleaning body diversion pipe (7) For the returned spherical cleaning body (SB) and cooling water ("divided cleaning water"), a sieve tube (27 having a side wall constituted by a porous plate that allows passage of cooling water but prevents passage of the spherical cleaning body (SB) (27) ), And a cylindrical cleaning body recovery part (2b) provided with a cleaning water outlet pipe (29) for flowing cooling water that has passed through the side wall of the sieve cylinder (27), and a cleaning water outlet pipe (29 ) And a cleaning water injection pipe (21), and a circulation pump (2c) interposed between them, and when the circulation pump (2c) is operated, a cleaning water lead-out pipe (29 ) To the cleaning water injection pipe (21) of the cleaning body supply part (2a), and the movable plate (21) is moved by the jet force of the cooling water ejected from the discharge port (22) of the cleaning water injection pipe (21). 24) is moved upward and the opening (2) formed in the bottom plate part (28) of the cleaning body recovery part (2b) 8a) is closed with a movable plate (24) to clean the spherical cleaning body (SB) retained in the lower part of the cleaning body supply section (2a) through the check valve (5) and the inflow pipe (6). It is fed from the body injection pipe (31) to the cooling water supply pipe (3) and passes through the heat transfer pipe (1p) from the cleaning body separation part (4b) of the cooling water discharge pipe (4) to the cleaning body branch pipe (7). Heat exchanger transfer that collects the spherical cleaning body (SB) sent back to the cleaning body recovery part (2b) through the space surrounded by the sieve cylinder (27) and the movable plate (24) ("sieve bowl") A hot-tube cleaning device (claim 1) is provided. Note that the parentheses indicate reference symbols, terms, and the like of the embodiment, and the same applies to the following.

  In the heat exchanger heat exchanger tube cleaning device according to the present invention, the cleaning body separating portion (4b) has a large diameter portion located on the heat exchanger (1) side and a small diameter portion (42) located on the downstream side of the cooling water. The peripheral edge of the diameter portion is connected to the inner wall of the cooling water discharge pipe (4), and the cooling water discharged from the heat exchanger (1) is allowed to pass but the passage of the spherical cleaning body (SB) discharged together with the cooling water is blocked. And a spherical cleaning body (SB) blocked by the sieve funnel (41) with the small diameter portion (42) of the sieve funnel (41) as a drawing port. A cleaning body lead-in pipe (43) to be drawn into the cleaning body branch pipe (7) can be provided.

  In this cleaning device, the cleaning body injection pipe (31) has a cleaning body injection port (32) directed in the cooling water upstream direction in the cooling water supply pipe (3), and the cleaning body inlet pipe (43) is drawn. The mouth (42) is located on the same horizontal plane as the inlet (32) of the cleaning body injection pipe (31), and the area perpendicular to the cooling water flow direction is the inlet (32) of the cleaning body injection pipe (31). ) Smaller than the above (claim 3). Moreover, the cleaning body separation part (4b) further includes a turbulent flow member (44) that generates a turbulent flow in the flow of the cooling water discharged from the heat exchanger (1) in the sieve funnel (41). [Claim 4] It can comprise.

  The heat exchanger heat exchanger tube cleaning device according to the present invention can be configured to further include a control device (2e) for controlling the operation and non-operation of the circulation pump (2c).

  In the heat exchanger heat exchanger tube cleaning device according to the main feature of the present invention (Claim 1), a spherical cleaning body (SB) is provided in a plurality of heat exchanger tubes (1p) arranged in parallel in the heat exchanger (1) and through which cooling water flows. ) Through the cleaning body circulation device (2), the check valve (5), the cleaning body injection pipe (31) and the cleaning body separating section ( 4b) is provided, and by the cleaning body circulation device (2), the check valve (5), the cleaning body injection pipe (31), the heat transfer pipe (1p) in the heat exchanger (1), the cleaning body separating part (4b) ) And the cooling water circulating back to the cleaning body circulation device (2), the spherical cleaning body (SB) is sent to the heat transfer pipe (1p) and is collected after passing through the heat transfer pipe (1p). That is, the cooling water to be circulated from the cleaning body circulation device (2) to the heat exchanger (1) together with the spherical cleaning body (SB) is called diverted cleaning water (or circulation cleaning water), and the cleaning body circulation device (2). The spherical cleaning body (SB) sent out together with the diverted cleaning water is allowed to flow only in the feeding direction by the check valve (5), is heated from the cleaning body injection pipe (31) via the inflow conduit (6). It is sent to the cooling water supply pipe (3) of the exchanger (1). The spherical cleaning body (SB) fed into the cooling water supply pipe (3) passes through a large number of heat transfer pipes (1p) in the heat exchanger (1) and passes through the heat transfer pipe (1p) on the inner surface. The adhered foreign matter is removed and discharged together with the cooling water to the cooling water discharge pipe (4). In the cooling water discharge pipe (4), the spherical cleaning body (SB) is separated by the cleaning body separating section (4b), and the cleaning body is circulated through the cleaning body branch pipe (7) together with a part of the cooling water (divided cleaning water). Sent back to the device (2).

  More specifically, the cleaning body circulation device (2) includes a cylindrical cleaning body recovery section (2b) and a cleaning body supply section (2a) disposed above and below, and a circulation pump (2c) dedicated to diverted cleaning water pressure feeding. It has a bypass structure. The cleaning body supply unit (2a) includes a cleaning body delivery pipe (25) for feeding out the spherical cleaning body (SB) from the lower side surface, a movable plate (24) movable upward in the center upper portion, and a movable plate (24). And a cleaning water injection pipe (21) having a discharge port (22) heading to the bottom, and a space ("cleaning body staying part") for retaining the spherical cleaning body (SB) that passes through the heat transfer pipe is provided at the lower part. ing. The cleaning body recovery part (2b) is provided on the bottom plate part (28) provided on the boundary with the cleaning body supply part (2a), and on the bottom plate part (28), and the cleaning body branch pipe (7). The cooling water sent back from is passed through, but the spherical cleaning body (SB) has passed through the sieve cylinder (27) whose side is composed of a porous plate that blocks the passage, and the side of the sieve cylinder (27). A cleaning water outlet pipe (29) for allowing cooling water to flow is provided, an opening (28a) is formed at the center of the bottom plate portion (28), and the movable plate (24) of the cleaning body supply portion (2a) is directed upward. When it moves, the opening (28a) is closed by the movable plate (24), and a cleaning body collecting space called a sieve is formed between the opening (28a) and the sieve tube (27). A circulation pump (2c) is interposed between the cleaning water outlet pipe (29) and the cleaning water injection pipe (21).

  At the time of cleaning the heat transfer pipe (1p), the cleaning water injection pipe (21) of the cleaning body supply section (2a) from the cleaning water outlet pipe (29) of the cleaning body recovery section (2b) can be obtained simply by operating the circulation pump (2c). ) And the movable plate (24) is moved upward by the jet force of the cooling water ejected from the discharge port (22) of the cleaning water injection pipe (21). The opening (28a) formed in the bottom plate part (28) of 2b) is closed by the movable plate (24). Thereby, the spherical cleaning body (SB) staying in the lower part of the cleaning body supply section (2a) is supplied with cooling water from the cleaning body injection pipe (31) through the check valve (5) and the inflow pipe (6). In addition to being sent to the pipe (3), the cleaning body recovery part (2b) passes through the heat transfer pipe (1p) and passes through the cleaning body separation pipe (7) from the cleaning body separation part (4b) of the cooling water discharge pipe (4). The spherical cleaning body (SB) sent back to () can be collected in the cleaning body storage space ("sieve jar") surrounded by the sieve cylinder (27) and the movable plate (24). And, when all the spherical cleaning bodies (SB) staying in the lower part of the cleaning body supply part (2a) are recovered in the cleaning body collection space ("sieve bowl") of the cleaning body recovery part (2b), It returns to the original state only by stopping the operation of the circulation pump (2c).

  Therefore, according to the present invention, it is possible to effectively clean the inner surface of the heat exchanger heat transfer tube and improve the heat exchange capability with a low cost and simple structure that does not use expensive automatic control valves.

  Moreover, the cleaning body separation part (4b) of the heat exchanger heat exchanger tube cleaning device according to the present invention is provided with a funnel-shaped sieve funnel (41) made of a porous plate and a cleaning body lead-in pipe (43). The sieve funnel (41) has a large diameter portion located on the heat exchanger (1) side and connected to the inner wall of the cooling water discharge pipe (4), and is discharged from the heat exchanger (1) by the porous plate. However, the cleaning body retracting pipe (43) is connected to the small diameter portion of the sieve funnel (41). ), The spherical cleaning body (SB) blocked by the sieve funnel (41) is drawn into the cleaning body branch pipe (7) (Claim 2). Therefore, according to this invention, a cleaning body separation part can be realized by using a porous plate body of the same quality as the porous plate body used for the sieve cylinder of the cleaning body recovery part in the sieve funnel.

  In this case, the inlet (32) of the cleaning body injection pipe (31) faces the upstream side of the cooling water in the cooling water supply pipe (3) and is located on the same horizontal plane as the cleaning body injection inlet (32). The inlet (42) of the inlet pipe (43) has an area perpendicular to the cooling water flow direction smaller than the cleaning body inlet (32). Therefore, according to the present invention, a part of the cooling water is prevented from being diverted from the cleaning body drawing pipe into the cleaning body branch pipe by the cooling water flow, and the spherical cleaning body is not formed in the cooling water supply pipe from the cleaning body supply section. It is possible to prevent it from being leaked easily.

  Further, a turbulent flow member (44) is provided in the sieve funnel (41) of the cleaning body separating portion (4b) so as to generate a turbulent flow in the flow of the cooling water discharged from the heat exchanger (1). (Claim 4). Therefore, according to the present invention, it is possible to prevent the spherical cleaning body from solidifying and flowing into the cleaning body drawing port.

  The heat exchanger heat exchanger tube cleaning device according to the present invention includes a control device (2e) for controlling the operation and non-operation of the circulation pump (2c). Therefore, according to the present invention, it is possible to easily control the start and stop of cleaning of the heat exchanger heat transfer tubes only by controlling the operation and non-operation of the circulation pump using the control device.

It is explanatory drawing of the structure (at the time of non-cleaning = at the time of a circulation pump stop) of the heat exchanger heat exchanger tube washing | cleaning system by one Example of this invention. It is explanatory drawing of the cleaning body circulation apparatus (just after cleaning start = immediately after a circulation pump action | operation) by one Example of this invention. It is explanatory drawing of the structure (during cleaning = circulation pump operation | movement) of the heat exchanger heat exchanger tube washing | cleaning system by one Example of this invention. It is explanatory drawing of the cleaning body circulation apparatus (during cleaning = circulation pump operation | movement) by one Example of this invention. It is a figure for demonstrating the function of the cleaning body distribution part (ball separator) by one Example of this invention.

[Schematic configuration of heat exchanger tube cleaning system]
FIG. 1 is a view for explaining the configuration of a heat exchanger heat exchanger tube cleaning system according to an embodiment of the present invention, and particularly shows a state when not cleaning, that is, when a circulation pump is stopped. In the heat exchanger heat exchanger tube cleaning system according to one embodiment of the present invention, the spherical cleaning body SB is sent to the heat exchanger tube 1p and passed through the heat exchanger tube 1p with respect to the heat exchanger 1 having a large number of heat exchanger tubes 1p. A cleaning body circulation device 2 for collecting the spherical cleaning body SB is provided. The heat exchanger 1 that functions as a steam turbine condenser, a refrigerator condenser, or the like includes a large number of heat transfer pipes 1p between the inlet water chamber 1i and the outlet water chamber 1o, and the upstream side and the outlet of the inlet water chamber 1i. A cooling water supply pipe 3 and a cooling water discharge pipe 4 are provided on the downstream side of the water chamber 1o, respectively. In this example, the heat exchanger 1, the cooling water supply pipe 3, and the cooling water discharge pipe 4 are configured by steel plate flange pipes and have a horizontal central axis xx. The heat exchanger 1 is supplied from a cooling water supply source (not shown) such as a water intake source or a cooling tower by a cooling water supply pump (not shown) installed further upstream of the cooling water supply pipe 3. The cooling water passes through the heat transfer pipe 1p of the heat exchanger 1 via the cooling water supply pipe 3, and while it is passing through the heat transfer pipe 1p, a fluid to be cooled (not shown) that passes outside the heat transfer pipe 1p. For example, in the case of a refrigerator condenser, the refrigerant) is cooled. Then, the cooling water that has passed through the heat transfer pipe 1p of the heat exchanger 1 is returned to a cooling water return destination (not shown) such as a drainage destination or a cooling tower via the cooling water discharge pipe 4.

  Here, the cooling water contains foreign matters such as dust, algae, calcium, silica, etc., and while the cooling operation is continued, these foreign matters adhere to the inner surface of the heat transfer tube 1p, and the contamination proceeds. The heat transfer coefficient of the heat exchanger 1 is reduced. Therefore, when the heat transfer tube 1p needs to be cleaned, the cleaning body circulation device 2 is operated to send the spherical cleaning body SB to the heat transfer tube 1p, and the inner surface of the heat transfer tube 1p is washed with the spherical cleaning body SB, and then the heat transfer tube The spherical cleaning body SB that has passed 1p is returned to the cleaning body circulation device 2. The spherical cleaning body SB has an outer diameter substantially equal to or slightly larger than the inner diameter of the heat transfer tube 1p, and is a porous and elastic spherical body such as a sponge or sponge. A typical example of the material is rubber. is there. The spherical cleaning body SB is also called a sponge body, a cleaning ball, or simply a ball.

  The cleaning body circulation device 2 mainly includes a cleaning body supply unit 2a, a cleaning body collection unit 2b, and a circulation pump 2c. When the circulation pump 2c is operated, the cleaning body supply unit 2a includes the spherical cleaning body SB. Water is sent out and injected into the cooling water supply pipe 3 through the check valve 5 and the cleaning body inflow pipe 6. The water passing through the cleaning body circulation device 2 for transferring the spherical cleaning body SB and washing the heat transfer pipe 1p is a part of the cooling water diverted from the cooling water passing through the heat transfer pipe 1p. Since it returns to the heat transfer pipe 1p and circulates again from the circulation device 2, it is particularly called “division cleaning water” or “circulation cleaning water”. The spherical cleaning body SB contained in the shunt cleaning water jetted into the cooling water supply pipe 3 is mixed with the cooling water from the cooling water supply pump and moves toward the heat exchanger 1. The spherical cleaning body SB that has passed through the heat transfer pipe 1p of the heat exchanger 1 is mixed in the cooling water discharged to the cooling water discharge pipe 4, and together with a part of the cooling water, flows into the cleaning body from the cooling water discharge pipe 4. It returns to the cleaning body collection | recovery part 2b of the cleaning body circulation apparatus 2 via the pipe line 7 and the on-off valve 8. FIG.

  In the heat exchanger heat transfer tube cleaning system according to the embodiment of the present invention, the heat transfer tube 1p of the heat exchanger 1 can be cleaned only by operating the circulation pump 2c of the cleaning body circulation device 2. That is, when the circulation pump 2c is operated, the diverted cleaning water is pumped to the cleaning water injection pipe 21 of the cleaning body supply unit 2a, and the movable plate 24 is raised by the jet force of the cooling water ejected from the cleaning water injection pipe 21. The opening 28a of the bottom plate part 28 of the cleaning body recovery part 2b is closed. As a result, the spherical cleaning body SB staying at the lower part of the cleaning body supply unit 2a is sent from the cleaning body injection pipe 31 to the cooling water supply pipe 3 through the check valve 5 and the inflow pipe 6 and the heat transfer pipe 1p. The spherical cleaning body SB that has passed through and sent back from the cleaning body separation part 4b of the cooling water discharge pipe 4 to the cleaning body recovery part 2b through the cleaning body branch pipe 7 is collected in a sieve basket (sieve cylinder 27 + movable plate 24). The Then, when the operation of the circulation pump 2c is stopped when all the spherical cleaning bodies SB are collected in the sieve basket, the movable plate 24 falls, and all the spherical cleaning bodies SB pass through the opening 28a from the cleaning body collection section 2b. It moves to the cleaning body supply part 2a and returns to the original state where all the spherical cleaning bodies SB stay in the cleaning body supply part 2a. This will be described in detail below.

[Cleaning body circulation device]
The cleaning body supply unit 2a and the cleaning body collection unit 2b of the cleaning body circulation device 2 are also called “ball reservoirs”, and are generally composed of a steel plate cylindrical body having the same diameter, with a central axis z-z in the vertical direction. Have. In this vertical cylindrical ball reservoir (2a + 2b), a cleaning body recovery portion 2b is formed at the upper portion, a cleaning body supply portion 2a is formed at the lower portion, and a cleaning body supply portion 2a is formed at the side of the ball reservoir. And the circulation pump 2c is provided in the form which bypasses a water flow between the cleaning body collection | recovery parts 2b.

  The cleaning body supply unit 2 a includes a cleaning water injection pipe 21, a stopper 23, a movable plate 24, and a cleaning body delivery pipe 25. One end of the cleaning water injection pipe 21 is connected to the circulation pump 2c, and serves as a discharge part 22 in which the pipe line is directed upward in the center of the cleaning body supply part 2a. That is, in the discharge part 22 of the cleaning water injection pipe 21, the pipe is directed upward, and the diverted cleaning water pumped from the circulation pump 2c is jetted upward from the opening at the upper end. A disc-shaped movable plate 24 is provided above the discharge unit 22 so as to be raised. Note that the shape of the movable plate 24 is a disk shape in the illustrated example, but the central portion in the vicinity of the central axis z-z is recessed upward to form a bowl shape, and the upper side from the diversion cleaning water ejected from the discharge portion 22. It may be easy to receive a force in the direction, and in this case, the peripheral edge portion (the ridge portion) of the ridge portion may be formed flat.

  FIG. 2 is a view for explaining the configuration of the cleaning body circulating apparatus according to one embodiment of the present invention, and particularly shows a state immediately after the start of cleaning, that is, immediately after the operation of the circulation pump. The movable plate 24 is movable in the vertical direction at the upper center of the cleaning body supply unit 2a. When the circulation pump 2c is not in operation, the movable plate 24 is stationary on the stopper 23 as shown in FIG. When is operated, as shown in FIG. 2, it moves to the bottom part (28) of the cleaning body collecting part 2b. The stopper 23 is supported by the central portion of a plurality of (for example, two) stopper support members 23a whose both ends are fixed to the inner wall of the cleaning body supply section 2a, and the cleaning body is upward on the axis z-z. A slide bar 23b extending to the lower part of the collection unit 2b is fixed. At the center of the movable plate 24, a hole for passing the slide bar 23b is formed, and the slide bar 23b is inserted into this hole relatively closely (no gap is formed). Therefore, when an upward force is applied to the movable plate 24 by the operation of the circulation pump 2c, the movable plate 24 moves from the stationary position shown in FIG. 1, that is, the stationary position shown by the broken line in FIG. 2, to the slide rod 23b. It is guided and moves upward, reaches the operating position indicated by a broken line in FIG. 2, and the movable plate 24 comes into contact with the bottom of the cleaning body collecting unit 2b.

  In addition, a space (referred to as a cleaning body retaining portion) sufficient to retain all the spherical cleaning bodies SB used for cleaning the heat transfer tubes 1p is formed at the lower portion of the cleaning body supply section 2a. On the lower side surface of the supply unit 2a, a cleaning body delivery pipe 25 for sending the diverted cleaning water including the spherical cleaning body SB to the check valve 5 is provided. Further, a suitable first side below the insertion position of the cleaning water injection pipe 21 is provided with a first inspection port that can be removed to insert or remove the spherical cleaning body SB from the outside. Is attached with a first monitoring window (glass window) Wa for visually checking the staying state of the spherical cleaning body SB in the cleaning body staying portion.

  The cleaning body collection part 2b located on the cleaning body supply part 2a includes a sieve (sieving) cylinder 27, a bottom plate part 28 provided at the boundary with the cleaning body supply part 2a, and a cleaning water outlet pipe 29. A cleaning body recovery pipe 26 connected to the on-off valve 8 is provided on the upper side wall of the cleaning body recovery part 2b, and a circular opening having a diameter smaller than the outer diameter of the movable plate 24 is provided at the center of the bottom plate part 28. 28a is formed. The sieve cylinder 27 is provided inside the cylindrical body extending from the bottom of the cleaning body recovery pipe 26 to the bottom plate portion 28, and the peripheral edge of the collar portion formed at the upper end is connected to the inner peripheral surface of the cylindrical body side wall. The lower edge is connected to the upper surface of the bottom plate portion 28 around the opening 28a. The sieve cylinder 27 is made of a steel porous plate having a large number of holes formed by punching or the like, and at the time of cleaning, from the cleaning body branch pipe 7 by a large number of holes formed in the cylinder wall. Although the shunt cleaning water sent back through the on-off valve 8 is allowed to pass through, the spherical cleaning body SB contained in the shunt cleaning water has a “sieving (sieving) function” that prevents passage. The porous plate member constituting the sieve tube 27 may be made of other materials such as a strong metal instead of steel, and may be formed into a mesh or lattice by assembling such as welding instead of stamping or the like. You may form in a shape.

  The bottom plate portion 28 has a function of a movable plate stop plate. When the movable plate 24 of the cleaning body supply unit 2a rises along the slide bar 23b below the bottom plate portion 28 as shown in FIG. 2, the movable plate The peripheral edge of the 24 can be brought into close contact with the periphery of the opening 28a to close the opening 28a. When the opening 28a is closed by the movable plate 24, the sieve tube 27 and the movable plate 24 are sufficient to accommodate all the spherical cleaning bodies SB sent out from the cleaning body supply section 2a and used for cleaning the heat transfer tubes 1p. A cleaning body collecting space is formed. This space is called a “sieve screen”. During cleaning, a spherical cleaning that flows (returns) from the heat exchanger 1 through the cooling water discharge pipe 4, the cleaning body branch pipe 7 and the on-off valve 8. The body SB can be accommodated in a sieve bag.

  Further, on the side wall of the cylindrical body of the cleaning body collecting portion 2b outside the sieve cylinder 27, cleaning is performed above the cleaning water injection pipe 21 so that the diverted cleaning water that has passed through the sieve cylinder 27 is directed to the circulation pump 2c. A water outlet pipe 29 is provided. Further, a removable second inspection port provided with a second inspection window (glass window) Wb for confirming the collection state of the spherical cleaning body SB in the cleaning body accommodating portion is provided at the upper end portion of the cleaning body recovery portion 2b. Provided.

  The circulation pump 2c is connected to the cleaning water lead-out pipe 29 and the cleaning water injection pipe 21 at the side of the cleaning body recovery part 2b and the cleaning body supply part 2a, and is divided and passed through the sieve tube 27 of the cleaning body recovery part 2b. Used to pump water. A pump motor 2d that drives the circulation pump 2c is controlled by a pump control device 2e. At the time of non-cleaning, that is, when the circulation pump 2c is stopped, as shown in FIG. 1, all the spherical cleaning bodies SB stay in the cleaning body staying portion of the cleaning body collecting portion 2b.

  When cleaning the heat transfer pipe 1p, if the pump motor 2d is driven by the pump operation control device 2e to operate the circulation pump 2c, the circulation pump 2c receives the diverted cleaning water from the cleaning body recovery unit 2b as shown in FIG. It pumps to the cleaning body supply part 2a through the cleaning water injection pipe 21. In the cleaning body supply part 2a, the movable plate 24 is moved to the bottom part of the cleaning body recovery part 2b by the pressurized water jet force generated by the diverted cleaning water ejected from the discharge part 22 of the cleaning water injection pipe 21. As a result, the opening 28a of the bottom plate portion 28 is closed by the movable plate 24, and direct flow between the cleaning body recovery portion 2b and the cleaning body supply portion 2a is interrupted, and the cleaning water injection pipe discharge portion 22 is closed. The spherical cleaning body SB staying in the cleaning body staying portion at the lower part of the cleaning body collecting portion 2b is sent out to the cleaning body delivery pipe 25 by the pressurized water jet force generated by the diverted cleaning water.

[Injection or diversion of cleaning body]
FIG. 3 shows a state in which the heat exchanger heat exchanger tube cleaning system is cleaning, that is, the circulation pump is in operation, and the spherical cleaning body SB sent out together with the split cleaning water from the cleaning body supply unit 2a by the operation of the circulation pump 2c. Passes through the check valve 5 that allows the sent spherical cleaning body to flow only in the delivery direction, and is sent to the cooling water supply pipe 3 through the cleaning body inflow conduit 6. The cooling water supply pipe 3 is connected to a cooling water supply pipe line upstream of the cooling water flow to a cooling water supply source (not shown) via a supply pump (not shown), and downstream of the heat exchanger 1. It is connected to the inlet water chamber 1i. The cooling water supply pipe 3 includes a cleaning body injection pipe 31 connected to the cleaning body inflow pipe 6, and the cleaning body injection pipe 31 is inserted perpendicular to the pipe of the cooling water supply pipe 3. The tip (exit) 32 of the cleaning body injection pipe 31 is called a cleaning body injection port, and mainly faces the upstream direction of the cooling water flow.

  In this example, in order to simplify the design and processing, the shape of the cleaning body injection port 32 is an elliptical cut shape obtained by obliquely cutting the circular tube of the cleaning body injection tube 31, and the cutting angle α, that is, the cooling water flow The angle α of the cut surface with respect to the plane perpendicular to the axis xx is an acute angle, for example, the cutting angle α = 10 ° to 30 °. In this way, the cleaning body inlet 32 is directed in the direction of the cooling water flow so as to have a predetermined size and shape, so that when the cleaning body is not cleaned (see FIG. 1), The spherical cleaning body SB staying in the cleaning body supply unit 2a can be prevented from flowing into the cooling water.

  At the time of cleaning the heat transfer pipe 1p, as shown in FIG. 3, the spherical cleaning body SB is injected into the cooling water supply pipe 3 from the inlet 32 of the cleaning body injection pipe 31, and the flow of the cooling water supplied from the supply pump is changed. Get on and pass through the heat transfer tube 1p of the heat exchanger 1. That is, the spherical cleaning body SB is in contact with the inner surface of each heat transfer tube 1p and passes through the heat transfer tube 1p while removing and cleaning foreign matters such as dust, algae, calcium, and silica adhering to the inner surface of the tube. And the spherical cleaning body SB which passed the heat exchanger tube 1p is sent to the cooling water discharge pipe 4 through the outlet water chamber 1o according to a cooling water flow.

  The cooling water discharge pipe 4 is composed of a steel sheet cooling water discharge section 4a, a cleaning body branching section 4b, and a cooling water feedback section 4c having the same pipe diameter. Between the cooling water discharge part 4a connected to the outlet water chamber 1o of the heat exchanger 1 and the cooling water return part 4c following the cooling water return line to the cooling water return destination (not shown), flanges at both ends The cleaning body diverting portion 4b attached in the above is also called a ball separator, and is used to separate the spherical cleaning body SB from the cooling water that has passed through the heat transfer tube 1p of the heat exchanger 1, so that a funnel-shaped sieve (sieving) funnel is used. 41 and a cleaning body retracting pipe 43 having a cleaning body retracting port 42.

  As the main body of the sieve funnel 41, a steel porous plate having a large number of holes is used in the same manner as the porous plate of the sieve cylinder 27 in the cleaning body collecting part 2b. In the case of the sieve funnel 41, such a porous plate body is processed into a funnel shape, the maximum diameter is adjusted to the pipe inner diameter of the cleaning body diverting portion 4b, and the minimum diameter is adjusted to the cleaning body inlet 42. The cooling water discharged from the heat exchanger 1 side and the foreign matter peeled off from the heat transfer pipe 1p are allowed to pass through, but function to block the passage of the spherical cleaning body SB discharged together with the cooling water, and the cleaning body separation. Also called a board. It should be noted that the porous plate constituting the sieve funnel 41 may also be made of other materials such as strong metal instead of steel, and is formed into a mesh or lattice by assembly such as welding rather than stamping. It may be formed.

  For this reason, the sieve funnel 41 is connected in close contact with the inner wall of the cleaning body diverting part 4b at the maximum diameter end (large diameter part) on the cooling water discharge part 4a side in the cleaning body diverting part 4b. The cooling water containing the spherical cleaning body SB and foreign matters is received from the vessel 1. On the other hand, the minimum diameter end portion (small diameter portion) on the cooling water return portion 4c side is joined to the drawing port 42 of the cleaning body drawing pipe 43, and cleans the spherical cleaning body SB that is prevented from passing by the porous plate body. It can be retracted into the body retracting tube 43. The inner surface of the main body of the sieve funnel 41 is particularly referred to as a “sieving (sieving) surface”, and a large number of holes formed therein are particularly referred to as “sieving (sieving) holes”.

  The cleaning body lead-in pipe 43 has an L shape as a whole, a horizontal pipe having a central axis coinciding with the central axis xx of the cooling water discharge pipe 4 and an opening on the upstream side of the cooling water, and the horizontal pipe The upper end of the horizontal pipe is connected to the small diameter portion of the sieve funnel 41. The vertical pipe (also referred to as an extruded pipe) is connected to the cleaning body branch pipe 7 at the lower end. . That is, the opening 42 of the horizontal pipe functions as a cleaning body drawing port for drawing the spherical cleaning body SB, which is prevented from passing by the sieve funnel 41, into the cleaning body branching conduit 7.

  Further, a turbulent flow member 44 is provided in the cooling water receiving space of the sieve funnel 41 to prevent the spherical cleaning body SB from clumping. The upper surface of the sieve funnel 41 has a spherical cleaning body SB in the sieve funnel 41. A removable third inspection port including a third monitoring window (glass window) Wc for confirming the separation state of the first and second monitoring windows is provided.

  At the time of cleaning the heat transfer pipe 1p, the spherical cleaning body SB separated from the main cooling water flow by the sieve funnel 41 of the cleaning body distribution section 4b is separated from the cleaning body drawing pipe 43 together with a part of the cooling water, that is, the divided cleaning water. It is sent back to the cleaning body collection part 2b of the cleaning body circulation device 2 through the pipe line 7 and the on-off valve 8. The on-off valve 8 connected to the cleaning body branch pipe 7 is normally open, and is closed when the cleaning body circulating apparatus 2 needs to be inspected during non-cleaning. FIG. 4 shows a state of the cleaning body circulation device during such cleaning, that is, during operation of the circulation pump.

  During the cleaning of the heat transfer tube 1p, the spherical cleaning body SB sent back to the cleaning body recovery unit 2b is a cleaning body collection space (sieving bowl) surrounded by the sieve tube 27 and the movable plate 24 as shown in FIG. It is collected sequentially. On the other hand, the diverted cleaning water divided from the cooling water main flow to the cleaning body recovery unit 2b passes through the sieve cylinder 27, is pressurized by the circulation pump 2c, and is jetted into the cleaning body supply unit 2a. Therefore, while the spherical cleaning body SB stays in the cleaning body staying space of the cleaning body supply unit 2a, the spherical cleaning body SB is sent out from the cleaning body staying space to the cleaning body delivery pipe 25 and sent out. After passing through the heat transfer tube 1p, the body SB is sent back to the cleaning body collecting part 2b and collected in the cleaning body collection space (sieve trap).

<Function of sieve funnel>
FIG. 5 is a diagram for explaining the function of the cleaning body distribution section (ball separator) according to one embodiment of the present invention. As shown in FIG. 5 (1), when the angle θ with respect to the cooling water flow direction of the main body (cleaning body separating plate) of the sieve funnel 41, that is, the direction of the axis xx is called the inclination angle of the sieve funnel 41, When the inclination angle θ is large, when the spherical cleaning body SB in the cooling water rides on the flow of the cooling water and reaches the sieve funnel 41 at the time of cleaning, the spherical cleaning body SB is sucked into the sieve hole 41a by the water flow pressure and is spherical. The cleaning body SB may not be separated. In such a state, collection failure of the spherical cleaning body SB occurs, and the cleaning effect by this cleaning system is hindered.

As shown in FIG. 5 (1), when the cooling water flows through the sieve funnel 41, the moving speed of the spherical cleaning body SB is the same as the cooling water flow speed V. Therefore, regarding the moving speed V of the spherical cleaning body SB, VP = V × sin θ where VP is the force applied perpendicular to the sieving surface (41) and VR is the force parallel to the sieving surface (41).
VR = V × cos θ
In principle, when the relationship of VP <VR, that is, θ <45 °, the spherical cleaning body SB slides along the sieve surface and is not sucked into the sieve hole 41a.

  On the other hand, in order to suppress the flow rate of the cooling water passing through the sieve hole 41a so that the spherical cleaning body SB is not sucked into the sieve hole 41a, all the values formed on the sieve surface (41) are experimentally or empirically. It has been found that the sum of the hole areas of the sieve holes 41a must be at least 1.5 times the cross-sectional area of the cooling water discharge pipe 4. Therefore, at the time of cleaning, in order to smoothly draw the spherical cleaning body SB along the sieve surface into the drawing port 42, a predetermined inclination angle θ satisfying these conditions, for example, θ = 10 ° to 30 °, It is necessary to install a sieve funnel 41.

  In addition, when a large number of spherical cleaning bodies SB are solidified and flow into the sieve funnel 41 at the time of cleaning, the cleaning body retraction port 42 is clogged with the lump of the spherical cleaning body SB, resulting in poor recovery of the spherical cleaning body SB. The cleaning system will fail. On the other hand, as shown in FIG. 5 (2), when a turbulent flow member 44 is provided in the cooling water receiving space of the sieve funnel 41 and the turbulent flow member 44 causes turbulent flow in the cooling water flow, It is possible to prevent the cleaning body SB from solidifying and flowing into the drawing port 42. For example, if a vortex plate made of steel plate that generates turbulent flow in the cooling water flowing from the cooling water discharge portion 4a is attached to the central portion of the sieve funnel 41 as the turbulent flow member 44, turbulent flow is generated in the cooling water flow. Thus, the spherical cleaning body SB can be dispersed so as not to harden, and no collection failure occurs.

[Diversion prevention function during non-cleaning]
In the heat exchanger heat exchanger tube cleaning system according to the embodiment of the present invention, the inlet 32 of the cleaning body inlet pipe 31 and the cleaning body inlet 42 of the cleaning body inlet pipe 43 are designed to have a predetermined size related to each other. Thus, during non-cleaning, a part of the cooling water is prevented from being diverted from the cleaning body drawing pipe 43 to the cleaning body branch pipe 7 by the cooling water flow, and the spherical cleaning body SB staying in the cleaning body supply section 2a Can be prevented from inadvertently flowing into the cooling water supply pipe 3.

  In this cleaning system, as shown in FIG. 1, a cooling water supply pump (not shown) is operated, and cooling water is passed from the cooling water supply pipe 3 to the heat exchanger 1 and the cooling water drain pipe 4. In the state where the circulation pump 2c is not operated and the cleaning body circulation device 2 is stopped under the conditions, the on-off valve 8 is normally fully opened, so that the cleaning body drawing pipe 43 of the cooling water drain pipe 4 is cleaned. Cooling is performed via the body part flow line 7, the on-off valve 8 (always fully open), the sieve cylinder 27 and the opening 28 a of the cleaning body recovery part 2 b, the cleaning body supply part 2 a, the check valve 5, and the cleaning body inflow pipe 6. A flow path reaching the cleaning body injection pipe 31 of the water supply pipe 3 is formed. Here, since the check valve 5 is inserted in the backward flow direction conduit from the cleaning body injection pipe 31 to the cleaning body supply section 2a, the direction from the cleaning body supply section 2a to the cleaning body injection pipe 31 Due to the check function of the check valve 5 which allows only the flow of the coolant, the cooling water does not flow from the cleaning body injection pipe 31 to the cleaning body supply part 2a side. Further, the inlet 32 of the cleaning body injection pipe 31 inserted and attached to the cooling water supply pipe 3 is directed in the direction (upstream side) opposite to the direction in which the cooling water flows, and the cutting angle α = 10 ° to 30 °, and the opening area viewed from the flow direction of the cooling water is ensured to be larger than the cross-sectional area of the inlet 42 of the cleaning body inlet pipe 43 in the cooling water drain pipe 4. ing. Thereby, the situation where a cooling water flows in into the cleaning body circulation apparatus 2 side from the cleaning body drawing-in pipe 43 at the time of non-cleaning does not arise.

That is, the inlet 42 of the cleaning body inlet pipe 43 in the cleaning body branching portion 4b attached to the cooling water drain pipe 4 is directed in the same direction as the inlet 32 of the cleaning body inlet pipe 31, and both are cooled. Capturing water flow. In such conditions, the dynamic pressure ΔPo in hydrodynamic pressure ΔPi [kg / m ^2] and cleaning body inlet 32 in the cleaning body inlet port 42 [kg / m ^2], the flow rate V [m / s] of the cooling water and All of the gravity acceleration g [m / s ² ] have the same value represented by V ² / (2 g) (ΔPi = ΔPo). The opening area of the injection port 32 is larger than the cross-sectional area of the cleaning body drawing port 42. Accordingly, the cleaning body retracting pipe 43 → the cleaning body branching pipe line 7−the on-off valve 8 (always fully open) −the cleaning cylinder 27 and the opening 28a of the cleaning body recovery section 2b−the cleaning body supply section 2a−the check valve 5−the cleaning body The flow of water does not occur in the flow path of the inflow pipe 6 → the cleaning body injection pipe 31.

  On the other hand, if the inlet 32 of the cleaning body injection pipe 31 faces the downstream direction of the cooling water, no dynamic pressure is generated in the cleaning body injection pipe 31 and the dynamic pressure ΔPo = 0. The dynamic pressure ΔPi is generated only in the cleaning body retracting pipe 43, and the relationship ΔPi> ΔPo is established. Therefore, the above-mentioned cleaning body retracting pipe 43 -cleaning body branching pipe line 7-opening / closing valve 8 (normally fully open state) -sieving cylinder 27 and opening 28a of the cleaning body recovery section 2b-cleaning body supply section 2a-check valve 5- Cleaning body inflow conduit 6-Flow of water occurs in the flow path of the cleaning body injection pipe 31, and when the pressure loss of the heat exchanger 1 is small even during non-cleaning waiting for operation, cooling from the cleaning body supply unit 2 a The spherical cleaning body SB flows into the water supply pipe 3 carelessly.

[Summary of cleaning operation]
In the heat exchanger heat exchanger tube cleaning system according to one embodiment of the present invention, preparation for sending out the spherical cleaning body SB into the heat exchanger 1 during non-cleaning is completed, and the pump controller 2e performs pumping according to a system operation start command by a user operation. When the motor 2d is driven and the circulation pump 2c is operated, the circulation pump 2c is connected to the cleaning body branch pipe 7, the on-off valve 8, and the cleaning body collection part 2b through the cleaning body drawing pipe 43 of the cooling water drain pipe 4. 27 and the cleaning water lead-out pipe 29, the split cleaning water is drawn in and pressurized, and the split cleaning water is fed into the cleaning water injection pipe 21 at a high pressure and discharged into the cleaning body supply unit 2a. In the cleaning body supply unit 2a, the movable plate 24 moves up to the movable plate stop plate 28 along the slide bar 23b by the jet force of the discharged cleaning water and stops. When the movable plate 24 stops and the opening 28a of the stop plate 28 is closed, the upper cleaning body collecting portion 2b and the lower cleaning body supply portion 2a communicated inside the ball reservoir during non-cleaning are completely divided. In addition, in the cleaning body supply unit 2a, a turbulent flow is generated by the ejected jet cleaning water, and the spherical cleaning body SB stored in the lower part of the lower portion rides on the water flow, and the cleaning body delivery pipe 25, It is transferred to the cleaning body injection pipe 31 via the check valve 5 and the cleaning body inflow pipe 6.

  The spherical cleaning body SB sprayed together with the cleaning water from the cleaning body injection pipe 31 into the cooling water supply pipe 3 passes through the numerous heat transfer pipes 1p in the heat exchanger 1 and cleans the inner surface thereof, and then discharges the cooling water. It is guided to the sieve funnel 41 in the pipe 4 and collected and separated, and passes from the cleaning body retracting pipe 43 through the cleaning body branch pipe 7 and the on-off valve 8 (always fully open), and is a sieve cylinder of the cleaning body recovery section 2b. 27 and a movable plate 24. When all of the injected spherical cleaning body SB is collected and collected in the sieve rods 27 and 24, the pump control device 2e stops the operation of the pump motor 2d and stops the operation of the circulation pump 2c according to the system operation stop command. To do. When the operation of the circulation pump 2c is stopped, the water supply jet of the cleaning water injection pipe 21 is stopped, so that the jet force in the cleaning body supply unit 2a becomes ineffective and the movable plate 24 slides down to the stopper 23 along the slide bar 23b. Stop. Due to the fall of the movable plate 24, the opening 28a of the movable plate stop plate 23 is closed, and the spherical cleaning body SB stored in the sieve bowl (the sieve cylinder 27 + the movable plate 24) at the upper part of the ball reservoir is removed from the lower part of the ball reservoir. Is moved to the cleaning body supply unit 2a and stored in the cleaning body staying space.

1 a heat exchanger provided with a large number of heat transfer tubes 1p between an inlet water chamber 1i and an outlet water chamber 1o;
2 cleaning body circulation device provided with cleaning body supply part 2a, cleaning body recovery part 2b, and circulation pump,
21 cleaning water injection pipe having a discharge part 22;
23 A stopper comprising a stopper support 23a and a slide bar 23b,
25, 26 Cleaning body delivery pipe and cleaning body collection pipe,
27 A sieve tube that forms a sieve basket together with the raised movable plate 24 and the bottom plate portion 28;
29 Cleaning water outlet pipe,
Wa to Wc 1st to 3rd inspection windows (1st to 3rd inspection ports)
31 A cleaning body injection pipe attached to the cooling water supply pipe 3 and having a cleaning body injection port 32;
4 a cooling water discharge pipe comprising a cooling water discharge part 4a, a cleaning body branching part 4b and a cooling water return part 4c, 41 a sieve funnel to which a turbulent flow member (vortex plate) 44 is attached,
43 Cleaning body drawing pipe provided with cleaning body drawing port 42,
5, 8 Check valve and on-off valve 6, 7 Cleaning body inflow line and cleaning body branch line,
SB Spherical cleaning body (sponge ball).

Claims (5)

A heat exchanger heat exchanger tube cleaning device for removing foreign substances adhering to the inner surface of the heat exchanger tube by passing the spherical cleaning body through a plurality of heat exchanger tubes arranged in parallel in the heat exchanger and through which cooling water flows.
A cleaning body circulation device that sends out the spherical cleaning body to the heat transfer tube and collects the spherical cleaning body that has passed through the heat transfer tube;
A check valve for allowing the spherical cleaning body fed from the cleaning body circulation device to flow only in the feeding direction;
A cleaning body injection pipe that sends the spherical cleaning body that has flowed through the check valve into the cooling water supply pipe that guides the cooling water to the heat exchanger via the inflow conduit;
A cleaning body that separates the spherical cleaning body from the cooling water discharge pipe that discharges the cooling water from the heat exchanger, and sends the separated spherical cleaning body together with a part of the cooling water back to the cleaning body circulation device through the cleaning body branch pipe. Consisting of a separation part,
Cleaning body circulation device
A cleaning body delivery pipe for sending out the spherical cleaning body from the lower side surface, a movable plate movable upward in the center upper portion, and a cleaning water injection pipe having a discharge port directed to the movable plate, and a spherical shape that passes through the heat transfer tube A cylindrical cleaning body supply section having a space for retaining the cleaning body at the bottom;
Provided at the boundary with the cleaning body supply part and moved upward, the opening formed at the center of the bottom is closed by the movable plate, provided on the bottom plate part, and sent back from the cleaning body branch pipe About the spherical cleaning body and cooling water The cooling water that has passed through the side part of the sieve cylinder that the cooling water is allowed to pass but the side part is configured with a porous plate that blocks the passage of the spherical cleaning body. A cylindrical cleaning body recovery unit equipped with a cleaning water outlet pipe for causing,
A circulation pump interposed between the cleaning water outlet pipe and the cleaning water injection pipe;
During operation of the circulation pump, the cooling water is pumped from the cleaning water outlet pipe of the cleaning body recovery section to the cleaning water injection pipe of the cleaning body supply section and is movable by the jet force of the cooling water ejected from the discharge port of the cleaning water injection pipe By moving the plate upward and closing the opening of the bottom plate part of the cleaning body collecting part with a movable plate, the spherical cleaning body retained in the lower part of the cleaning body supply part is cleaned through the check valve and the inflow pipe. The spherical cleaning body that is fed from the body injection pipe to the cooling water supply pipe, passes through the heat transfer pipe and is sent back from the cleaning body separation section of the cooling water discharge pipe to the cleaning body recovery section through the cleaning body branch pipe, A heat exchanger heat exchanger tube cleaning device, wherein the heat exchanger tube is collected in a space surrounded by plates. The cleaning body separation part
The large diameter part is located on the heat exchanger side, the small diameter part is located on the cooling water downstream side, the periphery of the large diameter part is connected to the inner wall of the cooling water discharge pipe, and the cooling water discharged from the heat exchanger is allowed to pass through A sieve funnel composed of a porous plate that prevents passage of a spherical cleaning body that is discharged with cooling water;
2. The cleaning body retracting pipe according to claim 1, further comprising: a cleaning body retracting pipe for retracting the spherical cleaning body, which is blocked by the sieve funnel, into the cleaning body diversion pipe, with the small diameter portion of the sieve funnel as the inlet. Heat exchanger heat transfer tube cleaning device. The cleaning body injection pipe has an injection port directed in the upstream direction of the cooling water in the cooling water supply pipe,
The inlet of the cleaning body inlet pipe is located on the same horizontal plane as the inlet of the cleaning body inlet pipe, and the area perpendicular to the cooling water flow direction is smaller than the inlet of the cleaning body inlet pipe. Item 3. The heat exchanger heat exchanger tube cleaning device according to Item 2.   4. The heat according to claim 2, wherein the cleaning body separating unit further includes a turbulent member that generates a turbulent flow in the flow of the cooling water discharged from the heat exchanger in the sieve funnel. Exchanger heat transfer tube cleaning device.   Furthermore, the heat exchanger heat exchanger tube washing | cleaning apparatus of any one of Claims 1-4 provided with the control apparatus which controls the action | operation and non-operation of a circulation pump.

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