JPS5816195A - Removing method of matter stuck to inside of branch pipe - Google Patents

Abstract

PURPOSE:To simultaneously remove the matter stuck to the inside of the respective branch pipes and consequently shorten the working time for removing the matter stuck to the inside of the branch pipes by a method wherein fluid added with abrasives is circulated through a plurality of the branch pipes in series. CONSTITUTION:In the method for removing the matter stuck to the inside of the branch piping 13 having a plurality of the branch pipes 14A and 14B connected in parallel thereto by sending fluid added with abrasives into the piping 13 and the pipes 14A and 14B, firstly, a shield plate 16 is inserted in a flange part 17. Secondly, a cover plate 19A is removed and the inserting pipe 30 of a jig 20 is inserted from the open end of the cover plate 19A into the piping 13. Thirdly, the tip opening of the inserting pipe 30 is fixed to the pipe 14B by pressure and a dust collector is connected to an exhaust port 26. Fourthly, nitrogen gas added with abrasives such as sand or the like is sent in from the base end of the pipe 30 at high speed. The nitrogen gas sent in the pipe 30 flows through the route of the pipes 14A and 14B, the piping 13, the exhaust port 26 and the dust collector. In other words, the nitrogen gas flows through the pipes 14A and 14B in series.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing deposits generated in a branch pipe disposed in a heating furnace, for example, in which deposits generated in a branch pipe are removed using a fluid mixed with an abrasive. .

In general, in heating furnaces, that is, equipment that has a large number of heating tubes installed in the furnace and heats the fluid flowing through the heating tubes by burning fuel with a burner, if it is operated for a long time, carbon etc. will build up in the heating tubes. generate. When carbon and the like are generated, the thermal conductivity deteriorates and the surface temperature of the tube increases, eventually making it impossible to operate.

On the other hand, there is a method called a so-called sand jet cleaning method as a method for removing carbon and the like generated inside the pipe. This is because when nitrogen gas mixed with abrasive material such as sand is sent into the pipe at a high speed of B□m/sec to 1QQrn/see, the nitrogen gas and abrasive material form a spiral inside the pipe. In this method, the abrasive material flows in a turbulent flow, and in the process, the abrasive material hits the inner wall surface of the tube at an acute angle, thereby removing deposits inside the tube.

However, although this method can exhibit an excellent removal effect in the case of a single tube, it has a drawback in the case of a heating tube disposed in a heating furnace. That is, in the case of a heating tube installed in a heating furnace or the like, as shown in FIG. This is because if nitrogen gas is fed from the heating tube, only one heating tube with low flow resistance will flow, and as a result, less nitrogen gas will flow to the other heating tube, making it impossible to remove deposits formed on multiple heating tubes at the same time.

Therefore, in the past, for example, as shown in FIG. 1, flange portions P and Q-rings S are provided at both ends of each heating tube 2A and 2B, respectively, and when one heating tube is processed by two people, the flange portion R
9S was performed with the flange portions P and Q closed when the other two heating tubes were treated. Therefore,
Since each heating tube is treated individually, the working time is inevitably long, and the problem associated with the increased working time is that a large amount of nitrogen gas and polishing are required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for removing deposits inside a branch pipe, which reduces work time.

The present invention is a method for sending fluid mixed with an abrasive into a branch pipe having a plurality of parallel branch pipes, in which each branch pipe is connected in series in a loop shape, and the fluid mixed with the abrasive is The object is to be achieved by serially circulating the fluid through the plurality of branch pipes so that the plurality of branch pipes can be treated at the same time.

Hereinafter, an actual M+i example for realizing the method of the present invention will be explained based on FIGS. 2 to 5.

FIG. 2 shows the structure of the heating furnace. Inside the heating furnace 11, a pair of branch metts and heating tubes 14A,
14B are arranged in parallel with each other and in a meandering manner. One ends of both heating tubes 14A and 14B are connected to the introduction tube 12 via a common branch base tube 13.

Further, the other ends of both heating tubes 14A and 14B are connected to each other and are connected to an outlet tube 15 in communication. A flange portion 17 is formed in the middle of the outlet pipe 15, into which a shielding plate 16 for blocking the flow within the outlet pipe 15 is appropriately inserted. In addition, flanges 18A and 181-3 are provided at the two open ends of the branch base pipe 13, respectively, and sealing plates 19A and 19B are detachably attached to the seven flanges 18A and 18B. The sealing plate 19A is attached when the heating furnace 11 is in operation.

Both open ends of the multi-branch base pipe 13 are in a closed state at 19B, but when removing deposits generated inside the pipe, one of the sealing plates 19A and 19B is removed and the opening is closed. The jig 21 is inserted into the branch base pipe 13 from the end.

3 and 4 show the state when the jig A21 is inserted into the branch base pipe 13, and FIG. 5 shows a perspective view of the jig X21. The jig 21 has a base body 22 that is attached to any one of the branch base pipes 13, for example, the 7 flange 18A.

The base body 22 has a cylindrical base tube 23 having a diameter larger than the inner diameter of the branch base tube 13 and is open at one end. The flank 25 is attached with a nut 24. A cylindrical discharge port 26 as a communication port is integrally fixed to the base cylinder 23 on the negative side thereof, and a support 3J28 having a plurality of clamping bolts 27 in the center on one end surface is also provided. Through holes 29 are provided in the upper and lower lids, respectively. support! The insertion tube 30 inserted into the branch base tube 13 is inserted through the tube 1128 so as to be movable and fixed by the bolt 27. 16. On the outer surface of the through hole 29, there is a threaded portion 3 on the outer periphery of the tip.
] Forming 1-forming guide cylinder 32 is fixed, and this guide cylinder 32
A crimping mechanism 33 is provided which urges the tip of the insertion tube 30 in one side direction through the crimping mechanism 33. It has a hollow cylindrical shape with a diameter approximately equal to the inner diameter, and the tip is slightly bent toward one side. A crimp plate 35 having a curved surface that matches the inner surface of the branch base tube 13 and having a dem packing 35A on the outer surface is fixed to the bent portion 34 along the opening edge, and a pressure plate 35 is fixed to the bent portion 34 on the upper and lower sides. A guide wheel 36 that rolls on the inner wall surface of the tube 13 is provided. In addition, at the proximal end of the insertion tube 300, 7
A sliding tube 38 to which a flange 37 is fixed, and which is slidably fitted into the support ring 28 at a predetermined position in the longitudinal direction of the insertion tube 30 and held by the tightening bolt 27
．． 39 are fixed respectively. That is, the branch base pipe 13
Attach the 7 langes 25 of the 7 langes 18AK base 22,
When the tip of the insertion tube 3o is located at the branching portion of the heating tubes 14A and 14B, the support l! Sliding tubes 39 and 38 are fixed at positions corresponding to 28, respectively.

The crimping machine $33 includes a pair of connecting rods 41 that are arranged parallel to each other on both sides of the insertion tube 30 and whose proximal ends protrude outside through the guide tube 32, and a pin between the tips of the pair of connecting rods P41. The biasing arm 43 is rotatably connected at substantially the center via a biasing arm 42. Biasing arm 4
3 has one end rotatably connected via a pin 45 to a protruding piece 44 protruding from the bent portion 34 of the insertion tube 30, and a roller 46 abutting against the inner wall of the branch base tube 13 at the other end. have. Further, a threaded portion 47 is formed on the base end side of the pair of connecting rods 41, and the threaded portion 47 is attached to the guide tube 3.
A nut 48 is screwed into the protruding portion 17 from 2.

Further, the protruding end to which the nut 48 is screwed comes into contact with the inner end surface of the cap 49 when the cap 49 is screwed onto the threaded portion 31 of the guide tube 32.

Next, the working method of this embodiment will be explained.

Normally, when the heating furnace 11 is in operation, both open ends of the branch base pipe 13 are closed by sealing plates 19 and 19B, and the shielding plate 16 of the 7-lung portion 17 is removed. Therefore, the fluid to be heated supplied from the introduction pipe 12 is transferred to the branch base pipe 1.
The fluid to be heated is branched from 3 to heating pipes 14 and 14B, respectively, and flows to an outlet pipe 15.The fluid to be heated is heated in the heating furnace 11 in the process of flowing through the heating pipes 14A and 14B.

On the other hand, due to the operation of the heating furnace 11, the fluid passages, especially the heating tubes 1
When removing deposits generated in 4A and 14B,
First, insert the cover plate 16 into the flange portion 17, and then insert one seal plate of the branch base pipe 13, for example, the seal plate 19 at the left end in FIG.
Removing B 1-1: Insert the insertion tube 30 of the jig 21 from its open end into the branch base tube 13. At this time, as shown in FIG. 3, by loosening the nut 48 screwed onto the connecting rod 41 and pushing the connecting rod 4 to the right in the figure, the biasing arm 43 is tilted. The cap 49 is inserted into the threaded portion 31 of the guide tube 32 in a screwed state.

As a result, when the open end of the bending part 34 of the insertion tube 30 is approximately located at the branching part of the heating tube 14B, the 7-lanzo 25 of the base body 22 is temporarily fixed to the flange 18A of the cutting base W13 with the bolt/nut 24. Next, the cap 49 is removed and the nut 48 screwed onto the connecting rod 41 is tightened. Then, as shown in FIG. 4, as the connecting rod P41 retreats, the biasing arm 43 rotates clockwise in the figure using the pin 45 at one end as a fulcrum, and the roller 46 at the other end moves toward the branch base pipe 13. It will be in a state where the inner wall is pressed. Due to this force, the open end of the bent part 34 of the insertion tube 30 is pushed into the branch part of the heating tube 14B,
In addition, the pressure bonding plate 35 is pressure bonded to the peripheral edge of the branch portion of the heating tube 14B. Finally, tighten the bolts and nuts 24 to firmly fix the flange 25 to the 7-lanzo 18A. With the above steps, setting of the jig 21 is completed.

Therefore, after connecting the dust collector to the discharge port 26, the insertion tube 30
Nitrogen gas mixed with sand or other abrasive material is pumped in at high speed from the base end. The nitrogen gas sent into the insertion tube 30 flows in series through the heating tubes 14A and 14B, the branch base tube 13, the outlet 26, the dust collector path, and the heating tubes 14B and 14A. . Then, the nitrogen gas and the abrasive material flow in a spiral shape inside each tube, and the deposits inside the tubes are removed by the action of the abrasive material.

According to the embodiment described above, the insertion tube 30 is inserted into the branch base tube 13 from the first open end of the branch base tube 13, and the distal end opening of the insertion tube 30 is connected to either of the heating tubes 14A, 14B. Once crimped, nitrogen gas mixed with abrasive is passed through the heating tube 14.
Since it is possible to form a flow path in series with A and 14B,
The deposits in the branch pipe can be removed in a short time without adding a 7-lunge or the like to the existing branch pipe as in the conventional case, and the consumption of abrasive material, nitrogen gas, etc. can be reduced.

Furthermore, when inserting the insertion tube 30 into the branch base tube 13, a guide ring 36 that rolls on the inner wall surface of the branch base tube 3 is provided at the distal end of the insertion tube 3o, so that the insertion operation is facilitated. It can be done easily. At that time, the connecting rod 41 is pushed L2 to bring the biasing arm 43 into a state that does not interfere with insertion, but since a cap 49 is provided to prevent the connecting rod 41 from returning, the biasing arm 43 is in that state. can be held.

Furthermore, since the insertion tube 30 is provided with sliding tubes 38.3'9 slidably fitted to the support ring 28 at two locations in the longitudinal direction, the distal end opening of the insertion tube 3o can be heated at any temperature. Pipe 14A
, 14B can be crimped to the branching part. Moreover,
Since the longitudinal position of the insertion tube 30 can be adjusted within the range of the sliding tubes 3B and 39, the tip opening of the insertion tube 30 can be accurately and reliably crimped to the branching part of the arbitrary heating tubes 14A and 14B. I can do it.

Next, another embodiment implementing the method of the invention will be described with reference to FIG. In the embodiment shown in FIG. 6, in a branch base pipe 13A)m to which ends of a plurality of heating pipes 14C, 14D, 14B, and 14F as branch pipes are connected, the heating pipes 14C and 14B and the heating pipes 14'E.

The heating tubes 14C, 14D, and 14F, which are connected to each other and communicated with the outlet pipe 15A, have flange portions 51.52 of 1 KHt between each 14F, and the heating tube 141' and the outlet W15A at the other end of the heating tubes 14C, 14D, and 14F, which are connected to each other and communicated with the outlet pipe 15A. and between the outlet pipe 15A and the heating pipe 14F, each of the flange parts 53.54
．． With 55 and 56 in closed bottles, nitrogen gas mixed with an abrasive is fed through one open end of the branch base pipe 13A, and the nitrogen gas is passed through each heating pipe 14C, 14D, 14g, and 14F.
After flowing in a loop, that is, in series, the liquid is discharged from the other open end.

Therefore, according to this embodiment, the flange portions 51°, 52.
Although the number of heating tubes 53 and 54 is increased, there is an advantage that the number of heating tubes is not limited.

Note that the present invention is not limited to the piping of the heating furnace 11 described in each of the embodiments above, but can be applied to any piping structure as long as it has a branch piping structure. Further, the fluid mixed with the abrasive material is not limited to the nitrogen gas described in each of the above embodiments. Furthermore, the flow of the fluid mixed with the abrasive material is not limited to one direction as in each of the above embodiments, but may be made to flow in one direction and then from the opposite direction. , if you perform the removal work from two opposite directions,
This method has the advantage that deposits can be removed more uniformly.

As described above, according to the present invention, since the fluid mixed with the abrasive material is circulated in series through a plurality of branch pipes, deposits in each branch pipe can be removed at the same time. It can shorten the working time when removing kimono, and as a result, the consumption of abrasive materials and fluids such as nitrogen gas can be reduced0.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing piping conventionally used in a general heating furnace, and FIGS. 2 to 5 show an embodiment for realizing the method of the present invention. Fig. 3 is a partially cutaway plan view showing the state of the jig used in the removal operation while it is being set, and Fig. 4 is a partially cutaway plan view showing the state of the jig after it is set. FIG. 5 is a perspective view of the jig, and FIG. 6 is an explanatory diagram showing another embodiment of the system for implementing the method of the present invention. 13.13A...Branch base pipe, ] 4A, ] 4.
B., 14C. 14D, 14B, 14F, branch pipe (o heating pipe, 21... jig. Agent: Patent attorney Minoru Kinoshita

Claims (1)

[Claims] (1) In a method of sending a fluid mixed with an abrasive into a branch pipe having a plurality of parallel branch pipes to remove deposits in the branch pipe, each of the branch pipes is connected in series in a loop shape. A method for removing deposits in branch pipes, comprising connecting the plurality of branch pipes and circulating a fluid mixed with an abrasive in series through the plurality of branch pipes. (2. In the branch piping according to claim 1, the fluid mixed with the abrasive is circulated from one side of the branch piping connected in a loop shape, and then is circulated again from the opposite direction. How to remove deposits inside pipes.