JP5316119B2 - Jet cleaning method - Google Patents

Description

The present invention relates to a method of jet cleaning the inner surface of a pipe to be cleaned connected to a header such as a boiler, and more particularly to a method of jet cleaning the inner surface of the pipe to be cleaned connected in a row so as to rise from the header.

  In a boiler for thermal power generation and other boilers, a pipe group such as a water pipe and a steam pipe is jet-washed with a water jet. In Patent Document 1 (Japanese Patent Laid-Open No. 2000-55588), a barrel portion, a tube plate and a plurality of tube support plates disposed horizontally in the barrel portion in a transverse direction of the barrel portion, and one end extending from the tube plate are disclosed. A plurality of heat transfer tubes extending in a row through each of the tube support plates so as to define a tube lane in the body portion, and the body portion includes In the steam generator in which a hand hole is formed above the tube plate, the scale removing device is inserted from the hand hole and applied to cleaning around the tube plate, and includes a high pressure water hose. A flexible lance that is movable with respect to the tube plate and the heat transfer tube, and a cleaning head that is attached to the tip of the flexible lance, and a fluid passage that communicates with the high-pressure water hose inside the cleaning head; Connected to the fluid passage A chamber for the steam generated dexterity scale removing device comprising a cavitation generating nozzle hole is formed communicating with the chamber is shown.

However, Patent Document 1 describes that the outside of the heat transfer tube group existing in the body portion is jet-cleaned. However, it is described that the inner surface of a pipe to be cleaned such as a water pipe or a steam pipe is jet-cleaned by a water jet. It has not been. In boilers for thermal power generation and other boilers, chemical cleaning using acid solution is performed at the time of new installation or periodic inspection, but in order to remove unnecessary solids such as sludge accumulated in the pipe to be cleaned and residual scale. In addition, the inner surface of a pipe to be cleaned such as a water pipe or a steam pipe is jet-cleaned with a water jet. In the jet cleaning of the inner surface of the pipe to be cleaned, a cleaning nozzle and a flexible hose similar to those used in Patent Document 1 are used.

A general boiler has a structure in which many pipe groups such as water pipes and steam pipes are connected to drums (bodies) such as water drums and steam drums. When the inner surface of the pipe to be cleaned such as a water pipe or steam pipe connected to the drum is jet cleaned, a person enters the drum and the flexible hose with the cleaning nozzle is cleaned. It is inserted into the pipe one after another and jets of water are jetted to perform jet cleaning work. However, in the boiler, there is a tube group that does not reach even if a flexible hose with a cleaning nozzle is inserted from the drum, and jet cleaning of the inner surface of the tube to be cleaned existing in such a place is difficult.

FIG. 4A is a side view of the two-body boiler, and FIG. 4B is a perspective view of a part thereof. In FIG. 4, the boiler 1 includes a tube group 5 in which a large number of pipes to be cleaned 4 are connected between a water drum 2 provided at a lower portion and a steam drum 3 provided at an upper portion. The front tube of this tube group is called the front wall tube 6 and the rear tube is called the rear wall tube 7. Independently from the tube group 5 of the boiler body that communicates the water drum 2 and the steam drum 3, side wall pipes 8 constituting side walls are provided on these side surfaces, and these side wall pipes 8 are connected to the water drum 2 and the steam. It connects to the headers 10 and 11 arranged so as to connect to the drum 3. A typical side wall pipe 8 is provided in a row so as to form a side wall by vertically communicating between the upper and lower headers 10 and 11 arranged so as to be orthogonal to the water drum 2 and the steam drum 3.

Such boiler 1, the water drum 2 provided in a lower portion, and between the steam drum 3 provided in the upper portion, the number of the boiler body to be cleaned pipe 4 is constructed by connecting the tube bundle 5 In the jet cleaning of the inner surface of the cleaning pipe 4, a person enters the water drum 2 or the steam drum 3, a flexible hose with a cleaning nozzle is sequentially inserted into the pipe 4 to be cleaned, and a water jet is jetted. Cleaning can be performed. However, the side wall pipe 8 configured independently from the tube group 5 of the boiler body that communicates the water drum 2 and the steam drum 3 is connected to the headers 10 and 11 disposed independently from the water drum 2 and the steam drum 3. Therefore, even if a flexible hose with a cleaning nozzle is inserted from the water drum 2 or the steam drum 3, the jet cleaning is difficult.

JP 2000-55588 A

An object of the present invention is to propose a jet cleaning method capable of easily and efficiently jet cleaning the inner surface of a pipe to be cleaned connected to a header disposed independently of a drum, with a simple apparatus and operation. It is.

The present invention is the following jet cleaning method.
(1) A method of jet cleaning the inner surface of a pipe to be cleaned connected to a header,
A guide tube having a tubular base portion extending along a space in the header and a curved tube portion extending from the end portion of the tubular base portion toward the opening end of the pipe to be cleaned is connected to the inside of the header from the opening portion of the header. Insert it into the space,
The guide tube is moved in Heda, be a bending tube portion while being opposed to the open end of the cleaning pipe to be connected to Heda, washed flexible hose with a nozzle inserted through the guide tube from the open end of the cleaning tube Insert into the cleaning pipe, and spray the water jet from the cleaning nozzle while moving the flexible hose forward to clean the inner surface of the pipe to be cleaned .
Then, the flexible hose with the cleaning nozzle is moved backward to move the guide tube, and with the curved tube part facing the opening end of the next tube, the flexible hose with the cleaning nozzle is advanced and the water jet is jetted to be cleaned. Clean the inside of the tube,
It is a cleaning method that repeats this ,
The tubular base portion of the guide tube is composed of a rigid tube or a flexible tube,
The curved tube portion of the guide tube is composed of a rigid tube,
When the tubular base portion of the guide tube is made of a rigid tube, the tubular base portion is provided with a handle for moving the guide tube, and the rigid tubular base portion and the curved tube portion are arranged at the opening end of the tube to be cleaned. It is joined by the joining member so as to extend,
When the tubular base portion of the guide tube is made of a flexible tube, one or more weight members are interposed in the middle portion of the tubular base portion, and the tubular base portion is connected to a rigid tubular connection tube via the connection member, The rigid connecting pipe and the bending pipe part are joined by a joining member so as to extend toward the opening end of the pipe to be cleaned,
A jet cleaning method, wherein the guide tube moves in the header so that the curved tube portion faces the opening end of the tube to be cleaned .
(2) The method according to (1) above, wherein the opening of the header into which the guide tube is inserted is an opening provided at the longitudinal end or side of the header.
(3) A joining member that joins the tubular base portion and the bending tube portion when the tubular base portion of the guide tube is made of a rigid tube , and a joining member that joins the connection tube and the bending tube portion when it is made of a flexible tube , The block formed at the end of the tubular base or the connecting tube and the bag-like coupling formed at the end of the bending tube are fixed by the indicator plunger, and the direction of the indicator plunger is to be cleaned of the bending tube. The method according to (1) or (2), wherein the method is adapted to coincide with the direction of the end portion on the tube side .
(4) The above (1) to (1) in which the tip of the bending tube portion is opposed to the opening end of the tube to be cleaned by the scale provided on the guide tube or the image display device that displays an image near the tip of the bending tube portion. The method according to any one of 3).
(5) The method according to any one of (1) to (4), wherein the guide tube is moved by pushing the guide tube from the opening side of the header or drawing a wire extending from the curved tube portion.

In the present invention, the washing pipe to be jet cleaning is the washing pipe which connects to Heda, the washing pipe is suitable as an object to be connected to the rows as in particular rises from Heda. As a pipe to be cleaned connected to such a header, a side wall pipe constituting a side wall is provided independently of a pipe group of a boiler main body connecting a drum such as a thermal power generation boiler and a water drum and a steam drum of other boilers. Can be mentioned. As such a side wall tube, those arranged in a row so as to form a side wall by connecting the upper and lower headers arranged perpendicularly to the water drum and the steam drum are suitable as objects to be cleaned. ing.

Heda is water supply pipe are of the structure to be cleaned tube such as a water wall tube are connected, but a structure that connects to the rows is suitable as the washing pipe rises especially Heda, the washing pipe Is not limited to one that rises upright, but may have a structure that rises in an inclined direction or a curved shape. The header may be on one or both of the upper and lower sides of the pipe to be cleaned connected thereto. The header is provided with an opening, and it is particularly preferred that the opening is provided at an end or a side surface in the longitudinal direction. Since the pipe connection part at the time of chemical cleaning and the cylindrical opening part for inspection are provided in the longitudinal direction edge part of a header, this can be utilized. Moreover, since the opening part for an inspection is provided in the side surface of a header, this can be utilized. The number of openings may be singular or plural.

The jet cleaning method of the present invention is configured to jet-clean the inner surfaces of the tubes to be cleaned connected to the header as described above, particularly the tubes to be cleaned connected in a row so as to rise from the header. In this case, the guide tube is inserted into the space inside the header from the opening of the header, and the cleaning tube inserted into the guide tube with the curved tube portion of the guide tube facing the opening end of the tube to be cleaned connected to the header. the flexible hose with nozzle is inserted from the open end of the cleaning tube to be cleaned canal, from the cleaning nozzle by ejecting waterjet cleaning a object to be cleaned pipe surface. After that, the flexible hose with the cleaning nozzle is moved backward to move the guide tube, and the water jet is sprayed while the flexible hose with the cleaning nozzle is advanced with the curved tube portion facing the open end of the next tube to be cleaned. The inner surface of the tube to be cleaned is cleaned, and this is sequentially repeated to perform jet cleaning in the tube to be cleaned .

Guide tube, have a bending tube portion extending toward the open end of the cleaning pipe connecting tubular base extending along the space portion, and the end of the tubular base portion in Heda in Heda, guide tube in Heda By moving, the bending tube portion is configured to face the opening end of the tube to be cleaned . Guide tube, the tube to be cleaned tubular base having a rigid or made of a flexible tube, is used. Guide tube tubular base consists of a tube having a rigid handle is provided, suitable for operation by projecting a base from the opening provided in the longitudinal end of Heda, necessary for Heda side portions While being supported by hand from the opening, it can be operated while observing. Moreover, the guide tube whose tubular base portion is a flexible tube is suitable for operation by inserting the guide tube through an opening provided on the side surface of the header. In the case where the tubular base portion is a guide tube made of a flexible tube, the tubular base portion can be positioned at the lowermost portion of the header by interposing one or more weight members in the middle portion of the tubular base portion. In this case, the guide tube can be operated by pushing or pulling the guide tube by hand while observing from the opening on the side surface of the header.

Bending tube portion of the guide tube is configured to extend curved toward the open end of the cleaning pipe which connects to Heda from the end of the tubular base portion, the cleaning pipe tip portion of the bending tube portion is to be connected to Heda It is preferable to bend so that it extends upward, generally in a perpendicular direction. Bending tube portion of the guide tube, the tubular base portion formed as a separate part, Ru is joined to the tubular base by bonding member. The guide tube is moved inside the guide tube by pushing the guide tube from the opening side of the header or by pulling a wire extending from the curved tube portion, and the leading end of the bent tube portion is connected to the opening end of the tube to be cleaned. Can be opposed. In order to couple the wire to the curved tube portion, an annular or hook-shaped coupling portion can be provided on the curved tube portion.

An image that moves the inside of the guide tube and provides a scale on the guide tube or displays an image in the vicinity of the distal end of the bending tube portion so that the distal end portion of the bending tube portion faces the open end of the tube to be cleaned connected to the header By providing the display device and moving the bending tube portion while viewing the scale or the image, the distal end portion of the bending tube portion can be accurately opposed to the opening end of the tube to be cleaned . By providing the scale on the tubular base portion of the guide tube protruding from the longitudinal end portion of the header, the position of the distal end portion of the bending tube portion can be accurately known. The image display device can be operated while observing the distal end of the curved tube and the open end of the tube to be cleaned by a combination of an imaging device such as a camera with illumination and a CCD camera and an image display such as a display. Thus, the position of the distal end portion of the bending tube portion can be accurately known.

Guide tube while being opposed to the open end of the cleaning pipe which connects the bending tube portion in Heda, a flexible hose with washing nozzle inserted through the guide tube is inserted from the open end of the cleaning tube to be cleaned tubes, washed Although it is configured to spray the water jet from the nozzle to clean the inner surface of the pipe to be cleaned , the flexible hose with the cleaning nozzle may be inserted into the guide pipe in advance, and the guide pipe may be inserted into the space in the header. It may be inserted after being inserted into. Similarly, the cleaning nozzle may be attached in advance to the flexible hose, or may be attached after insertion of the flexible hose. The cleaning nozzle has an injection port for injecting a water jet toward the inner periphery of the tube to be cleaned , preferably obliquely downward, and guides the flexible hose so that the cleaning nozzle advances and retracts over the entire length of the tube to be cleaned. The structure is to be inserted into the pipe.

As described above, the guide tube is inserted into the space inside the header from the opening of the header, and the curved tube portion of the guide tube is inserted into the guide tube in a state facing the opening end of the tube to be cleaned connected to the header. the flexible hose with washing nozzle is inserted from the open end of the cleaning tube to be cleaned canal, from the cleaning nozzle to inject the water jet was washed to be cleaned pipe surface, the guide tube by subsequently retracting the cleaning flexible hose with nozzle Move the curved tube part to face the opening end of the next tube to be cleaned, and while cleaning the inner surface of the tube to be cleaned , spray the water jet while moving the flexible hose with the cleaning nozzle forward. Thus, the jet cleaning in the tube to be cleaned can be easily and efficiently performed with a simple apparatus and operation.

According to the present invention, a guide tube having a tubular base portion extending along a space portion in the header and a curved tube portion extending from an end portion of the tubular base portion toward an opening end of a pipe to be cleaned connected to the header is provided. inserted from the opening into the space in Heda, while being opposed to the open end of the cleaning pipe a bending tube portion connected to Heda guide tube, the washing pipe cleaning flexible hose with a nozzle inserted through the guide tube Insert the tube into the tube to be cleaned from the open end of the nozzle, spray a water jet from the cleaning nozzle to clean the inner surface of the tube to be cleaned , then move the guide tube by moving the flexible hose with the cleaning nozzle backward, while it is opposed to the open end of the cleaning tube, while advancing the flexible hose with washing nozzle water jet jet washed to be cleaned pipe surface, by repeating this, independently of the drum The inner surface of the washing pipe which connects to the arranged Heda, simple equipment and operation, it is possible to easily and efficiently jet cleaning.

It is a perspective view which shows the jet cleaning method of 1st Embodiment. It is a perspective view which shows the jet cleaning method of 2nd Embodiment. (A), (b) is a front view of the washing | cleaning instrument in FIG. 1 and FIG. 2, respectively. (A) is a front view of a two-body type boiler, (b) is a partial perspective view thereof.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an example in which jet cleaning is performed by inserting a guide tube formed of a tube having a rigid tubular base portion so that the base portion protrudes from an opening provided at the longitudinal end portion of the header. 2 is an example in which jet cleaning is performed by inserting a guide tube having a tubular base portion made of a flexible tube into the header through an opening provided on the side surface of the header, as shown in FIG. ).

In FIG. 1 and FIG. 3 (a), the side wall pipe 8 and the header 11 correspond to the side wall pipe 8 and the head 11 in FIGS. 4 (a) and 4 (b), and are independent of the water drum 2 and the steam drum 3. A to- be-cleaned pipe 4 is connected to the arranged header 11 to constitute a side wall pipe 8. Here, the side wall pipe 8 is configured by connecting a large number of pipes 4 to be cleaned upward and in a row from the upper edge portion of the cylindrical header 11 arranged in the lateral direction. A large number of the tubes to be cleaned 4 are arranged in a line to form a planar side wall. At the end in the longitudinal direction of the header 11, a cylindrical connection provided for pipe connection and inspection during chemical cleaning is used as the opening 12. An inspection port is provided on the side surface of the header 11, and this is used as the opening 13.

The guide tube 15 has a tubular base portion 16 extending along a space portion in the header 11, and a curved tube portion 17 extending from the end portion of the tubular base portion 16 toward the opening end of the cleaned pipe 4 connected to the header 11. In this embodiment, the tubular base portion 16 is formed of a rigid tube, and the base portion 20 of the tubular base portion 16 is configured to protrude from the opening portion 12 provided at the longitudinal end portion of the header 11. The curved tube portion 17 is formed of a rigid tube, and is curved so as to extend upward in the perpendicular direction from the end portion of the tubular base portion 16 toward the opening end of the tube to be cleaned 4. The tubular base portion 16 and the curved tube portion 17 of the guide tube 15 are formed as separate parts and are joined by a joining member 18. The joining member 18 has a cube-shaped outer block 18 a formed at the end of the tubular base 16, and an outer cube-shaped bag-like coupling 18 b having a cubic-shaped recess formed at the end of the curved tube portion 17. The indicator plunger 18c is fixed in the joined state, and the direction of the indicator plunger 18c is made to coincide with the direction of the end of the curved tube portion 17 on the cleaned tube 4 side. Further, the bending tube portion 17 is provided with an annular coupling portion 19 for coupling the wire.

The base 20 protruding from the opening 12 provided at the longitudinal end of the header 11 of the tubular base 16 of the guide tube 15 is provided with a handle 21 that is orthogonal to the horizontal (horizontal) direction. 15 can be moved. An air / water injection part 22 is provided at the base 20 of the guide pipe 15 so that air and / or water can be injected into the guide pipe 15. A scale is provided on the base portion 20 of the guide tube 15, and when the guide tube 15 is moved in the header 11, the distal end portion of the bending tube portion 17 can be easily opposed to the open end of the tube to be cleaned 4. It has been made possible.

The guide tube 15 is hollow, and has a structure in which a flexible hose 24 to which a cleaning nozzle 23 is attached can be inserted into the guide tube 15. The flexible hose 24 with the cleaning nozzle 23 may be inserted into the guide tube 15 in advance, or may be inserted after the guide tube 15 is inserted into the space 14 in the header 11. Similarly, the cleaning nozzle 23 may be attached to the flexible hose 24 in advance, or may be attached after the flexible hose 24 is inserted. The cleaning nozzle 23 has an injection port that injects a water jet toward the inner periphery of the pipe 4 to be cleaned , preferably obliquely downward. The flexible hose 24 is inserted into the guide tube 15 so that the cleaning nozzle 23 moves forward and backward over the entire length of the tube 4 to be cleaned .

The guide tube 15 is inserted into the space 14 in the header 11 from the opening 12 or 13 of the header. Generally, the tubular base portion 16 of the guide tube 15 is inserted from the opening 12 to bend the curved tube portion. 17 can be inserted from the opening 13 and operated from the opening 13 to be joined to the tubular base 16 by the joining member 18. In this state, the guide tube 15 is moved while holding the handle 21 so that the end of the curved tube portion 17 faces the open end of the tube 4 to be cleaned . The handle 21 is provided so as to be orthogonal to the lateral (horizontal) direction. Since the distal end direction of the bending tube portion 17 is upward when the handle 21 is in a horizontal state, the distal end direction of the bending tube portion 17 can be easily grasped from the angle of the handle 21. The tubular base portion 16 has a rigid guide tube 15 made of a rigid tube as a whole, and is suitable for operating the base portion 20 by projecting the base portion 20 from the opening 12 provided at the longitudinal end of the header 11. In this case, if necessary, the guide tube 15 can be supported by hand from the opening 13 on the side surface of the head 11 and can be operated while being aligned while observing from the opening 13.

Thus the bending tube portion 17 while being opposed to the open end of the cleaning tube 4 connected to Heda 11, the flexible hose 24 with the washing nozzle 23 which is inserted into the guide tube 15 from the open end of the cleaning tube 4 The inner surface of the tube to be cleaned 4 is cleaned by inserting it into the tube to be cleaned 4 and spraying a water jet from the cleaning nozzle 23. By moving the flexible hose 24 with the cleaning nozzle 23 forward and backward, after the cleaning of the pipe 4 to be cleaned , the ejection of the water jet is stopped and the flexible hose 24 with the cleaning nozzle 23 is moved backward to move the guide pipe 15. the moved, the bending tube portion 17 while being opposed to the open end of the next object to be cleaned tube 4, while advancing the flexible hose 24 with the washing nozzle 23 to inject the water jet to wash the inner surface of the washing pipe 4 By repeating this, jet cleaning of the inner surface of the entire pipe to be cleaned 4 constituting the side wall pipe 8 is performed.

The jet cleaning of the scale of the object to be cleaned tube 4, solids such as sludge, and other waste products, since swept into Heda 11 from the washing pipe 4, without discharging pipe of the set or temporary (shown ) Is discharged from the header 11 through the system. When jet cleaning is performed while injecting air and / or water from the air / water injecting section 22, it is possible to prevent solids and the like from flowing into the guide tube 15, but when solids and the like flow into the guide tube 15. Injecting air and / or water from the air / water injection section 22 into the guide tube 15 with the flexible hose 24 with the cleaning nozzle 23 being pulled out or not being pulled out, and unnecessary materials such as solid matter in the guide tube 15 Can be washed out and discharged out of the system from the header 11 in the same manner.

  In FIG. 2 and FIG. 3B, the guide tube 15 is configured such that the tubular base portion 16 is formed of a flexible tube and is inserted into the space portion 14 from the opening portion 13 on the side surface portion of the header 11. In this guide tube 15, a plurality of weight members 25 having a shape that fits into the bottom of the header 11 are interposed in an intermediate portion of the tubular base 16 made of a flexible tube, so that the tubular base 16 is located at the lowermost portion of the header 11. It can be configured to be located. A tubular base 20 having rigidity is connected to the proximal end side of the tubular base portion 16 made of a flexible tube via a connecting member 26, and a connecting member 26 is connected to the side of the curved tube portion 17 having rigidity. A rigid tubular connecting tube 27 is connected. The connecting tube 27 and the bending tube portion 17 are joined by the joining member 18 similar to that shown in FIGS. 1 and 3A. A wire rod 28 is coupled to an annular coupling portion 19 provided in the bending tube portion 17 and is drawn out from the opening 13 opposite to the guide tube 15 insertion side.

An image display device 30 is provided in the vicinity of the opening 13 on the side opposite to the insertion side of the guide tube 15. The image display device 30 includes an illumination camera, a CCD camera, and other imaging device 32 provided at the tip of a cable 31 inserted into the opening 13 opposite to the insertion side of the guide tube 15, and an outer side of the header 11. The image display unit 33 is provided in combination, so that the distal end portion of the bending tube portion 17 and the open end of the tube to be cleaned 4 can be observed. Other configurations are the same as those in FIGS. 1 and 3A.

  The guide tube 15 is inserted into the space 14 in the header 11 from the opening 13 of the header. Generally, the guide tube 15 integrated as shown in FIG. Then, the bending tube portion 17 is inserted into the space portion 14 sequentially through the opening portion 13, and the base portion 20 is protruded from the opening portion 13. At this time, in the guide tube 15, a plurality of weight members 25 interposed in an intermediate portion of the tubular base portion 16 made of a flexible tube are fitted into the bottom portion of the header 11, and the tubular base portion 16 is stably positioned at the lowermost portion of the header 11. . A tubular base portion 20 having rigidity is connected to the proximal end portion side of the tubular base portion 16 made of a flexible tube via a connection member 26, and rigidity is connected to the curved tube portion 17 side via a connection member 26. A tubular connecting pipe 27 is connected, and the bending pipe section 17 is further connected via a connecting member 18.

At this time, while observing from the opening 13 on the side surface of the header 11, the guide tube 15 is moved by pushing or pulling by hand, and the guide tube 15 is twisted (rotated) by hand. The bending tube portion 17 can be operated so that the tip of the bending tube portion 17 faces the opening of the tube 4 to be cleaned . At this time, when positioning is difficult due to the flexibility of the tubular base portion 16, the wire rod 28 coupled to the annular coupling portion 19 provided in the bending tube portion 17 is opened to the opposite side of the guide tube 15 insertion side. By combining the operation of pulling out 13, the tubular base 16 can be accurately positioned. Further, the image pickup device 32 of the image display device 30 is disposed at a position where the distal end portion of the bending tube portion 17 and the opening end of the tube to be cleaned 4 can be observed, and the image signal of the image pickup device 32 is displayed on the image display portion 33. The position of the distal end portion of the bending tube portion 17 can be accurately controlled by performing the insertion operation of the guide tube 15 while observing the distal end portion of the bending tube portion 17 and the opening end of the tube to be cleaned 4.

Thus the bending tube portion 17 while being opposed to the open end of the cleaning tube 4 connected to Heda 11, the flexible hose 24 with the washing nozzle 23 which is inserted into the guide tube 15 from the open end of the cleaning tube 4 It is inserted into the pipe 4 to be cleaned, a water jet is sprayed from the cleaning nozzle 23 to clean the inner surface of the pipe 4 to be cleaned , and this operation is repeated to perform jet cleaning. These operations are shown in FIGS. ).

Examples of the present invention will be described below. In the following embodiment, jet cleaning is performed on the side wall tube 8 shown in FIGS. 1 and 2 in which the pipes to be cleaned 4 having an inner diameter of 55 mm and a length of 8 m are connected to the header 11 having an inner diameter of 26 cm and a length of 2 m in an upward direction. It was. As shown in FIG. 1, the header 11 is provided with a connecting pipe having an inner diameter of 76 mm and a length of 16 cm as the opening 12 provided at the end in the longitudinal direction, and a circular inspection having a diameter of 10 cm as the opening 13 in the side surface. Mouth is provided.

After the chemical cleaning of the side wall tube 8, jet cleaning was performed by the method shown in FIGS. 1 and 3A. The tubular base portion 16 of the guide tube 15 having an inner diameter of 20 mm is inserted from the opening portion 12, the bending tube portion 17 is inserted from the opening portion 13, and the opening portion 13 is joined to the tubular base portion 16 by the joining member 18. The guide tube 15 is supported from 13 by hand, and the guide tube 15 is moved so that the end of the curved tube portion 17 is opposed to the opening end of the tube to be cleaned 4, and the rear injection type cleaning nozzle 23 is attached to the tip. The flexible hose 24 was inserted into the guide tube 15, the flexible hose 24 with the cleaning nozzle 23 was moved forward and backward, and 20 MPa of high-pressure water was injected to repeat cleaning of the tube 4 to be cleaned . The cleaning time for each tube to be cleaned 4 was about 1.5 minutes.

As in Example 1, jet cleaning was performed by the method shown in FIG. As shown in FIG. 2 and FIG. 3 (b), the guide tube 15 is formed by inserting two weight members 25 in the middle portion of a tubular base portion 16 made of a flexible tube having an inner diameter of 20 mm. 13 is inserted into the space 14 in the header 11, and the image display device 30 is provided in the opening 13 on the opposite side to observe the image, and the guide tube 15 is moved to cover the end of the bending tube portion 17. A flexible hose 24 having a diameter of 12 mm, which is opposed to the opening end of the cleaning pipe 4 and has a rear injection type cleaning nozzle 23 attached to the tip thereof, is inserted into the guide pipe 15, and the flexible hose 24 with the cleaning nozzle 23 is advanced and retracted. The high-pressure water was sprayed to repeat the cleaning of the pipe 4 to be cleaned . The cleaning time for each tube to be cleaned 4 was about 2 to 3 minutes.

The present invention is applicable to a method of jet cleaning the inner surface of a pipe to be cleaned connected to a header such as a boiler, and particularly to a method of jet cleaning the inner surface of the pipe to be cleaned connected in a row so as to rise from the header.

1: boiler, 2: water drum, 3: steam drum, 4: pipe to be cleaned , 5: tube group, 6: front wall pipe, 7: rear wall pipe, 8: side wall pipe, 10, 11: header, 12, 13: Opening portion, 14, space portion, 15: guide tube, 16: tubular base portion, 17: curved tube portion, 18: joining member, 19: coupling portion, 20: base portion, 21: handle, 22: air / water injection Part 23: cleaning nozzle 24: flexible hose 25: weight member 26: connecting member 27: connecting pipe 28: wire rod 30: image display device 31: cable 32: image pickup device 33: image display Department.

Claims (5)

A method for jet cleaning the inner surface of a pipe to be cleaned connected to a header,
A guide tube having a tubular base portion extending along a space in the header and a curved tube portion extending from the end portion of the tubular base portion toward the opening end of the pipe to be cleaned is connected to the inside of the header from the opening portion of the header. Insert it into the space,
The guide tube is moved in Heda, be a bending tube portion while being opposed to the open end of the cleaning pipe to be connected to Heda, washed flexible hose with a nozzle inserted through the guide tube from the open end of the cleaning tube Insert into the cleaning pipe, and spray the water jet from the cleaning nozzle while moving the flexible hose forward to clean the inner surface of the pipe to be cleaned .
Then, the flexible hose with the cleaning nozzle is moved backward to move the guide tube, and with the curved tube part facing the opening end of the next tube, the flexible hose with the cleaning nozzle is advanced and the water jet is jetted to be cleaned. Clean the inside of the tube,
It is a cleaning method that repeats this ,
The tubular base portion of the guide tube is composed of a rigid tube or a flexible tube,
The curved tube portion of the guide tube is composed of a rigid tube,
When the tubular base portion of the guide tube is made of a rigid tube, the tubular base portion is provided with a handle for moving the guide tube, and the rigid tubular base portion and the curved tube portion are arranged at the opening end of the tube to be cleaned. It is joined by the joining member so as to extend,
When the tubular base portion of the guide tube is made of a flexible tube, one or more weight members are interposed in the middle portion of the tubular base portion, and the tubular base portion is connected to a rigid tubular connection tube via the connection member, The rigid connecting pipe and the bending pipe part are joined by a joining member so as to extend toward the opening end of the pipe to be cleaned,
A jet cleaning method, wherein the guide tube moves in the header so that the curved tube portion faces the opening end of the tube to be cleaned .   The method according to claim 1, wherein the opening of the header into which the guide tube is inserted is an opening provided in a longitudinal end portion or a side surface of the header. When the tubular base portion of the guide tube is made of a rigid tube, the joining member that joins the tubular base portion and the bending tube portion, and the joining member that joins the connection tube and the bending tube portion when the guide tube is made of a flexible tube are: The block formed at the end of the connecting pipe and the bag-like coupling formed at the end of the curved pipe are fixed by the indicator plunger, and the direction of the indicator plunger is on the side of the pipe to be cleaned of the curved pipe. 3. A method according to claim 1 or 2, wherein the method is adapted to coincide with the direction of the edge . 4. The scale according to any one of claims 1 to 3, wherein the tip of the bending tube is opposed to the opening end of the tube to be cleaned by a scale provided on the guide tube or an image display device that displays an image near the tip of the bending tube. The method described.   The method according to claim 1, wherein the guide tube is moved by pushing the guide tube from the opening side of the header or drawing a wire extending from the curved tube portion.

Images