JP2010210221A - Jet cleaning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet cleaning method capable of easily and efficiently jet-cleaning an inner face of tubes connected with a header disposed independently from a drum with the simple device and operation. <P>SOLUTION: A guide tube 15 having a tubular basic section 16 and a curved tube section 17 is inserted to the header 11 from opening sections 12, 13, a flexible hose 24 with a cleaning nozzle 23 inserted into the guide tube 15 is inserted into a tube 4 from an opening end of the tube 4 in a state that the curved tube section 17 is opposed to the opening end of the tube 4, the water jet is injected from the cleaning nozzle 23 to clean the inner face of the tube 4, then the flexible hose 24 is retracted to move the guide tube 15, the water jet is injected while moving the flexible hose 24 with the cleaning nozzle 23 forward in a state that the curved tube section 17 is opposed to the opening end of the tube 4 to clean the inner face of the tube 4, and these processes are repeated to jet-clean a group of tubes 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method of jet cleaning the inner surface of a tube connected to a header such as a boiler, and more particularly to a method of jet cleaning the inner surface of a tube 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 is jet-cleaned, but describes that the inner surface of a pipe such as a water pipe or a steam pipe is jet-cleaned by a water jet. Absent. In boilers for thermal power generation and other boilers, chemical cleaning using an 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 before and after that and residual scale, The inner surface of a pipe such as a water pipe or a steam pipe is jet-washed with a water jet. In the jet cleaning of the inner surface of the pipe, 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. Therefore, when jet cleaning the inner surface of water pipes, steam pipes, etc. connected to the drum, a person enters the drum and sequentially inserts a flexible hose with a cleaning nozzle into the pipe. Then, a water jet is sprayed to perform the 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 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 tubes 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 a boiler 1 includes a tube 4 of a tube group 5 of a boiler body configured by connecting a large number of tubes 4 between a water drum 2 provided at a lower portion and a steam drum 3 provided at an upper portion. Jet cleaning of the inner surface can be performed by a person entering the water drum 2 or the steam drum 3 and by sequentially inserting a flexible hose with a cleaning nozzle into the pipe 4 and spraying a water jet. . 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

  SUMMARY OF THE INVENTION 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 connected to a header disposed independently from a drum, with a simple device and operation. .

The present invention is the following jet cleaning method.
(1) A method of jet cleaning the inner surface of a pipe connected to a header,
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 the tube connected to the header, and the space portion in the header from the opening portion of the header. Inserted into
With the curved pipe part of the guide pipe facing the open end of the pipe connected to the header, a flexible hose with a cleaning nozzle inserted into the guide pipe is inserted into the pipe from the open end of the pipe, and a water jet is jetted from the cleaning nozzle To clean the inside of the tube
After that, the flexible hose with a cleaning nozzle is moved backward to move the guide tube, and with the curved tube portion facing the opening end of the next tube, a water jet is jetted while the flexible hose with a cleaning nozzle is advanced to advance the inner surface of the tube. Wash and
A jet cleaning method characterized by repeating this.
(2) The method according to the above (1), wherein the opening of the header into which the guide tube is inserted is an opening provided on the longitudinal end or side of the header.
(3) The method according to (1) or (2) above, wherein the tubular base portion of the guide tube comprises a rigid tube or a flexible tube.
(4) The above (1) to (3), wherein the tip of the bending tube portion is opposed to the opening end of the tube by the scale provided on the guide tube or the image display device for displaying an image near the tip of the bending tube portion. The method in any one of.
(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 this invention, the pipe | tube used as the object of jet cleaning is a pipe | tube connected to a hedder, and the pipe | tube connected in a row | line | column so that it may stand up from a hedder is suitable as a target. Examples of the pipe connected to such a header include a side wall pipe that constitutes a side wall independently of a pipe group of a boiler body that communicates with a thermal power generation boiler, a drum such as a water drum and a steam drum of other boilers. . 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.

  The hedder has a structure in which pipes such as water supply pipes and water-cooled wall pipes are connected, and in particular, a structure in which the pipes are connected in rows so that the pipes rise from the header is suitable, but the pipes stand upright. It is not limited to this, and a structure that rises in an inclined direction or a curved shape may be used. The header may be on one or both of the top and bottom of the tube connected to it. 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 pipes connected to the header as described above, particularly the pipes connected in a row so as to rise from the header. In this case, the guide tube is inserted into the space inside the hedder from the opening of the header, and the guide tube with a cleaning nozzle inserted into the guide tube with the curved tube portion facing the opening end of the tube connected to the header. A flexible hose is inserted into the pipe from the open end of the pipe, and a water jet is jetted from the washing nozzle to clean the pipe inner surface. After that, the flexible hose with the cleaning nozzle is moved backward to move the guide tube, and with the curved tube portion facing the open end of the next tube, the water hose is jetted while the flexible hose with the cleaning nozzle is advanced to inject the inner surface of the tube. The tube is cleaned by repeating this in sequence.

  The guide tube is configured to have a tubular base portion extending along a space in the header and a curved tube portion extending from an end portion of the tubular base portion toward an opening end of a tube connected to the header. As the guide tube, a tube having a rigid tubular base or a flexible tube is used. A guide tube made of a tube having a rigid tubular base is suitable for operation by projecting the base from the opening provided at the longitudinal end of the header, and if necessary, manually from the opening on the side surface of the header. Support and operate 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.

  The curved tube portion of the guide tube is configured to bend and extend from the end portion of the tubular base portion toward the open end of the tube connected to the header, and the distal end portion of the curved tube portion extends in the direction in which the tube connected to the header is extended, In general, it is preferable to bend so as to be directed upward in a perpendicular direction. The curved tube portion of the guide tube may be formed integrally with the tubular base portion, or may be formed as a separate part and joined to the tubular base portion by a joining member. The guide tube is moved in 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 distal end portion of the bending tube portion is opposed to the opening end of the tube connected to the header. be able to. 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 display device for moving the inside of the guide tube and providing a scale on the guide tube or displaying an image in the vicinity of the distal end portion of the bending tube portion so that the distal end portion of the bending tube portion is opposed to the opening end of the tube connected to the header. By 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 open end of the tube. 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. As an image display device, by operating an imaging device such as a camera with illumination, a CCD camera, etc., and an image display unit such as a display while operating while observing the distal end portion of the curved tube portion and the open end of the tube, It is possible to accurately know the position of the distal end portion of the bending tube portion.

  With the guide tube facing the open end of the tube that connects the curved tube to the hedder, insert a flexible hose with a cleaning nozzle inserted into the guide tube into the tube from the open end of the tube, and spray a water jet from the cleaning nozzle The flexible hose with a cleaning nozzle may be inserted in the guide tube in advance, or may be inserted after the guide tube is inserted into the space in the header. Good. 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 that injects a water jet toward the inner periphery of the tube, preferably obliquely downward, and allows the flexible hose to be inserted into the guide tube so that the cleaning nozzle moves forward and backward over the entire length of the tube. Structure.

  As described above, the guide tube is inserted into the space in the header from the opening of the header, and the cleaning nozzle is inserted into the guide tube with the curved tube portion of the guide tube facing the opening end of the tube connected to the header. Insert the flexible hose into the pipe from the open end of the pipe, spray a water jet from the washing nozzle to clean the inner surface of the pipe, then move the guide pipe by moving the flexible hose with the washing nozzle backward to move the curved pipe section next. While facing the open end of the pipe, the water hose is jetted while the flexible hose with a washing nozzle is advanced to wash the inner surface of the pipe. The jet cleaning in the pipe can be performed efficiently.

  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 the end portion of the tubular base portion toward the opening end of the tube connected to the header is provided. Insert the flexible hose with a cleaning nozzle inserted into the guide tube into the tube from the open end of the tube, with the curved tube portion of the guide tube facing the open end of the tube connected to the header. Insert the water jet from the cleaning nozzle to clean the inner surface of the tube, and then move the guide tube by moving the flexible hose with the cleaning nozzle backward, with the curved tube facing the open end of the next tube. The inner surface of the pipe connected to the hedder arranged independently from the drum can be simplified by cleaning the inner surface of the pipe by spraying a water jet while moving the flexible hose with the cleaning nozzle forward. In Do apparatus and operation can be 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 side view of a two-body boiler, and (b) is a perspective view of a part 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 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 upward and in a row from the upper edge of the cylindrical header 11 arranged in the lateral direction. The tubes 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 an end portion of the tubular base portion 16 toward an opening end of the tube 4 connected to the header 11. In the 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 made 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 open end of the tube 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 so that the direction of the indicator plunger 18c coincides with the direction of the end of the curved tube portion 17 on the 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. The base 20 of the guide tube 15 is provided with a scale so that when the guide tube 15 is moved in the header 11, the distal end portion of the curved tube portion 17 can be easily opposed to the open end of the tube 4. Has been.

  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 tube 4, preferably in a diagonally downward direction. 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 in the tube 4.

  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 by holding the handle 21, and the end of the curved tube portion 17 is opposed to the open end of the tube 4, but the handle 21 is provided so as to be orthogonal to the horizontal (horizontal) direction. Since the distal end direction of the bending tube portion 17 is upward when the 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.

  In this manner, the flexible hose 24 with the cleaning nozzle 23 inserted into the guide tube 15 is inserted into the tube 4 from the opening end of the tube 4 with the curved tube portion 17 facing the opening end of the tube 4 connected to the header 11. The inner surface of the pipe 4 is cleaned by inserting and ejecting 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 is finished, 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. In a state where the curved pipe portion 17 is opposed to the opening end of the next pipe 4, the inner surface of the pipe 4 is cleaned by spraying a water jet while the flexible hose 24 with the cleaning nozzle 23 is advanced, and this is repeated. Jet cleaning is performed on the inner surface of the entire pipe 4 constituting the side wall pipe 8.

  By the above jet cleaning, the solids such as scale and sludge in the pipe 4 and other wastes are washed away from the pipe 4 into the header 11 and are discharged out of the system through the main or temporary pipe. . 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 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. 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. In addition, 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 4 can be observed, and the image signal of the image pickup device 32 is displayed on the image display portion 33 to bend. By observing the distal end portion of the tube portion 17 and the open end of the tube 4, the position of the distal end portion of the curved tube portion 17 can be accurately controlled by performing the insertion operation of the guide tube 15.

  In this manner, the flexible hose 24 with the cleaning nozzle 23 inserted into the guide tube 15 is inserted into the tube 4 from the opening end of the tube 4 with the curved tube portion 17 facing the opening end of the tube 4 connected to the header 11. It is inserted, and a water jet is sprayed from the cleaning nozzle 23 to clean the inner surface of the tube 4, and this is repeated to perform jet cleaning. These operations are the same as those in FIGS. 1 and 3A.

  Examples of the present invention will be described below. In the following examples, jet cleaning was performed on the side wall tube 8 shown in FIGS. 1 and 2 in which the pipe 4 having an inner diameter of 55 mm and a length of 8 m was connected to the header 11 having an inner diameter of 26 cm and a length of 2 m in an upward line. 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 by hand from 13 and the guide tube 15 is moved so that the end portion of the curved tube portion 17 is opposed to the open end of the tube 4, and the rear injection type washing nozzle 23 is attached to the tip thereof. 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 the cleaning of the tube 4. The washing time of the tube 4 per tube 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 an 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 connect the end of the curved tube portion 17 to the tube. The flexible hose 24 having a diameter of 12 mm, which is opposed to the open end of the nozzle 4 and has a rear injection type washing nozzle 23 attached to the tip thereof, is inserted into the guide tube 15, and the flexible hose 24 with the washing nozzle 23 is moved forward and backward to increase pressure of 20 MPa Water was sprayed and the tube 4 was washed repeatedly. The washing time for the tubes 4 per tube was about 2-3 minutes.

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

  1: Boiler, 2: Water drum, 3: Steam drum, 4: Tube, 5: Tube group, 6: Front wall tube, 7: Rear wall tube, 8: Side wall tube, 10, 11: Header, 12, 13: Opening, 14, space, 15: guide tube, 16: tubular base, 17: curved tube, 18: joining member, 19: joint, 20: base, 21: handle, 22: air / water injection part, 23: Washing nozzle, 24: Flexible hose, 25: Weight member, 26: Connection member, 27: Connection tube, 28: Wire rod, 30: Image display device, 31: Cable, 32: Image pickup device, 33: Image display unit

Claims (5)

A method of jet cleaning the inner surface of a pipe connected to a header,
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 the tube connected to the header, and the space portion in the header from the opening portion of the header. Inserted into
With the curved pipe part of the guide pipe facing the open end of the pipe connected to the hedder, a flexible hose with a cleaning nozzle inserted into the guide pipe is inserted into the pipe from the open end of the pipe, and a water jet is jetted from the cleaning nozzle To clean the inside of the tube
After that, the flexible hose with a cleaning nozzle is moved backward to move the guide tube, and with the curved tube portion facing the opening end of the next tube, a water jet is jetted while the flexible hose with a cleaning nozzle is advanced to advance the inner surface of the tube. Wash and
A jet cleaning method characterized by repeating this.   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.   The method according to claim 1 or 2, wherein the tubular base portion of the guide tube comprises a rigid tube or a flexible tube.   4. The scale according to claim 1, wherein the tip of the bent tube portion is opposed to the open end of the tube by a scale provided on the guide tube or an image display device that displays an image near the tip of the bent tube portion. Method.   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.

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