JP2012078262A - Wastage condition monitoring device for heat transfer pipe or generating tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wastage condition monitoring device for heat transfer pipes or generating tubes capable of evaluating corrosion and wastage conditions of a finned tube without disassembling or opening a device of boiler facilities.SOLUTION: A wastage condition monitoring device 10A for heat transfer pipes or generating tubes that monitors the wastage conditions of heat transfer pipes or generating tubes, includes: moving means 12 moving along fins 11 of a heat transfer pipe or a generating tube; laser measurement means 13 provided at the moving means 12 for measuring with laser, the wastage condition on the surface of the heat transfer pipe or the generating tube; cable means 14 including a light guide path for introducing laser light to the laser measurement means 13, and a lead-out path for transmitting reflected light; and a wastage condition determination means for comparing data of the laser measurement with past data or reference data and determining the current wastage condition.

Description

  The present invention relates to a thinning state monitoring device for a heat transfer tube or an evaporation tube that can easily monitor the thinning state of the heat transfer tube or the evaporation tube.

When operated for a long period of time, the diameter of the piping of the evaporator tube of the boiler equipment, the heat transfer tube of the heat exchanger, etc. is generated.
(1) For example, an evaporation pipe for a land boiler is in a combustion atmosphere and is exposed to a reducing atmosphere in order to suppress NOx in the combustion exhaust gas. is there.
(2) Further, for example, in the heat exchanger for the desulfurization apparatus, there is a problem that corrosion due to adhesion of sulfides generated in the desulfurization process to the heat transfer tube occurs.
(3) For example, in a heat exchanger heat transfer tube, there is a problem that the inner diameter of the heat exchanger tube is worn out due to use over a long period of time, and as a result, thinning occurs.

  For this reason, conventionally, there is a proposal to measure the thinning amount by laser measurement (see Patent Document 1 or 2).

JP 2009-204604 A JP-A-10-332646

However, the proposals in the above-mentioned patent documents have the following problems.
In the proposal of Patent Document 1, there is an example of using a laser displacement meter, but in order to identify a thinning state and corrosion position and range, a pipe part is removed once after disassembling the boiler, and a laser displacement meter is fixed to the pipe. There is a problem that measurement with a moving mechanism is required. Moreover, since it is necessary to change a support | pillar fixing position for every piping, there exists a problem that the measurement takes time.

  In addition, the ultrasonic measurement is a point measurement, and it is impossible to grasp the thickness reduction and corrosion distribution in the circumferential direction and axial direction of the pipe.

  In the proposal of Patent Document 2, there is a disclosure about an ultrasonic flaw detection apparatus for a fin welded portion of a spiral fin tube, but there is a problem in that evaluation in the pipe cross-section direction such as thinning and corrosion of the fin tube cannot be performed. is there.

  Therefore, it is anxious to be able to continuously evaluate the corrosion and thinning of the fin tube without disassembling or opening the boiler equipment.

  In view of the above problems, the present invention provides a thinning state monitoring device for a heat transfer tube or an evaporation tube that can continuously evaluate the corrosion and thinning status of fin tubes without disassembling or opening the boiler equipment. The issue is to provide.

  A first invention of the present invention for solving the above-described problem is a monitoring device for monitoring a thinning state of a heat transfer tube or an evaporation tube, and a moving means that moves along the fin of the heat transfer tube or the evaporation tube. A laser measuring means provided in the moving means for laser-measuring the thinned state of the surface of the heat transfer tube or the evaporation tube; a light guide path for introducing laser light into the laser measuring means; and a lead-out path for transmitting reflected light. A reduction in heat transfer tubes or evaporation tubes, comprising cable means and thinning state determination means for comparing the laser measurement data with past data or standard data to determine a current thinning state. In the meat condition monitoring device.

  According to a second aspect of the present invention, in the first aspect of the invention, there is provided a thinning state monitoring apparatus for a heat transfer tube or an evaporation tube, characterized by having a fixing means for temporarily fixing the moving means.

  According to a third invention, in the first or second invention, the moving means includes a moving means main body, a driving wheel and a driven wheel pivotally attached to the moving means main body, and a tension between the driving wheel and the driven wheel. And a thinning state monitoring device for a heat transfer tube or an evaporation tube, characterized in that it has a gripping means for gripping fin ends at every fin interval on the surface of the endless track band. .

  According to a fourth aspect of the present invention, in the first or second aspect of the invention, the moving means is a worm gear.

  According to a fifth invention, in any one of the first to fourth inventions, the laser measuring means measures the thinning state while sequentially moving the fin surface, the fin tube wall surface, and the fin surface by the movement of the moving means. It is in the thinning state monitoring apparatus of the heat exchanger tube or the evaporation tube characterized by these.

  According to the present invention, by moving along the fin tube, it is possible to evaluate the corrosion and thinning of the fin tube without, for example, disassembling or opening the boiler equipment.

FIG. 1-1 is a schematic diagram of a thinning state monitoring device for a heat transfer tube or an evaporation tube. FIG. 1-2 is a front view thereof. FIG. 1-3 is a schematic view of the caterpillar gripping portion. 1-4 is another schematic view of the caterpillar gripping portion. FIG. 2 is a perspective view of a thinning state monitoring device for a heat transfer tube or an evaporation tube. FIG. 3A is a schematic diagram illustrating a laser light irradiation state. FIG. 3B is another schematic diagram illustrating a laser light irradiation state. FIG. 4A is a diagram illustrating a state in which a half circumference of the fin is inspected. FIG. 4-2 is a diagram illustrating a state in which a half circumference of the fin is inspected. FIG. 4-3 is a schematic view of a process for inspecting the half circumference of the fin. FIG. 5 is a diagram illustrating a movement state between the fins. FIG. 6A is a diagram illustrating a state of moving to an adjacent fin. FIG. 6B is a diagram illustrating a state of moving to an adjacent fin. FIG. 6C is a diagram illustrating a state of moving to an adjacent fin. FIG. 7-1 is another diagram showing a state of moving to an adjacent fin. FIG. 7-2 is another schematic diagram illustrating the movement to the adjacent fin. FIG. 8-1 is another diagram showing a state of moving to an adjacent fin. FIG. 8-2 is another schematic diagram illustrating the movement to the adjacent fin. FIG. 8C is another diagram illustrating a state of moving to the adjacent fin. FIG. 8D is another schematic diagram illustrating the movement to the adjacent fin. FIG. 8-5 is another diagram illustrating the movement to the adjacent fin. FIG. 9 is another schematic diagram of a thinning state monitoring device for a heat transfer tube or an evaporation tube. FIG. 10 is a schematic diagram of a heat exchanger of an exhaust gas treatment facility.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

A thinning state monitoring apparatus for a heat transfer tube or an evaporation tube according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1-1 is a schematic diagram of a thinning state monitoring device for a heat transfer tube or an evaporation tube. FIG. 1-2 is a front view thereof.
As shown in FIG. 1, a heat transfer tube or evaporation tube thinning state monitoring device 10A is a monitoring device that monitors the heat transfer tube or evaporation tube thinning state, along the fins 11 of the heat transfer tube or evaporation tube. The moving means 12 that moves, the laser measuring means 13 that is provided in the moving means 12 and laser-measures the thinned state of the surface of the heat transfer tube or the evaporation tube, the light guide path that introduces laser light into the laser measuring means 13 and the reflection It comprises cable means 14 having a lead-out path for transmitting light, and thinning state determination means for comparing the laser measurement data with past data or standard data to determine the current thinning state. is there.
In the figure, reference numeral 15 denotes a fin tube.

FIG. 9 is a schematic view of a heat exchanger of an exhaust gas treatment facility.
As shown in FIG. 9, a heat exchanger that introduces exhaust gas 80 and exchanges heat with the heat medium 83 is provided.
The heat exchanger has a heat medium circulation passage 84 through which the heat medium 83 circulates between the heat recovery unit 81 and the reheater 82. The heat medium 83 circulates between the heat recovery device 81 and the reheater 82 via the heat medium circulation passage 84. A plurality of fins 11 are provided in the fin tube 15 on the surface of the heat medium circulation passage 84 provided in each of the heat recovery device 81 and the reheater 82. A heat exchanging portion 86 is provided in the heat medium circulation passage 84, and the medium temperature of the heat medium 83 can be adjusted by exchanging the heat medium 83 with the steam 87.

  The heat medium 83 is supplied from the heat medium tank 88 to the heat medium circulation passage 84. The heat medium 83 is circulated in the heat medium circulation passage 84 by the heat medium feed pump 89. Further, the supply amount of the steam 87 is adjusted by the control valve V1 according to the gas temperature of the purified gas 91, and is sent to the reheater 82 by the control valve V2 according to the gas temperature of the exhaust gas 80 discharged from the heat recovery device 81. The supplied heat medium 83 is supplied to the heat recovery unit 81, and the supply amount of the heat medium 83 supplied to the reheater 82 is adjusted. The purified gas 91 discharged from the reheater 82 is discharged from the chimney 92 to the outside.

  In the present embodiment, such a thinning state of the surface of the fin 11 or the fin tube 15 is monitored by the thinning state monitoring device 10A for the heat transfer tube or the evaporation tube.

FIG. 2 is a perspective view of a thinning state monitoring device for a heat transfer tube or an evaporation tube.
Here, the moving means 12 includes a moving means main body 21, a driving wheel 22 and a driven wheel 23 pivotally attached to the moving means main body 21, and an endless track extending between the driving wheel 22 and the driven wheel 23. In addition to a belt (caterpillar) 24, a grip portion 25 that grips the fin end portion 11 a at every interval of the fin 11 is provided on the surface of the endless track (caterpillar) 24. Laser measuring means 13 is mounted on the moving means main body 21.
In FIG. 2, reference numeral 26 denotes a drive motor, and 27 denotes an idler wheel.

FIG. 3A is a schematic diagram illustrating a laser light irradiation state, and FIG. 3B is another schematic diagram illustrating a laser light irradiation state.
Here, as shown in FIG. 3A, the laser measuring unit 13 includes a sensor head 31 having a laser displacement sensor and a prism 33 that shortens the focal length of the laser light 32, and is generated by the laser displacement sensor. The laser beam 32 is passed through the prism 33 to shorten the focal length.
Note that a mirror 35 may be used instead of the prism 33 as shown in FIG.

According to the present embodiment, the laser light 32 emitted from the laser displacement meter is guided between the fins 11 of the fin tube 15 and is emitted perpendicularly to the surface of the fin tube 15 by the light guide path tip 13a. The light guide path tip 13a is controlled by a control means (not shown) so that the reflection surface of the laser light 13 is moved from the fin 11 surface to the wall surface of the fin tube 15 and then to the fin 11 surface on the different side.
Thereby, the thickness of the thinned state is measured by continuously reading the positions of the reflecting surfaces from the fin 11 surface and the tube wall of the fin tube 15 with the laser displacement meter.

The measurement data of the laser measurement 13 is compared with past data or standard data, and the current thinning state is determined by the thinning state determination means.
At this time, by recording the position information from the measurement reference point, it is recorded together with the surface information from the laser displacement sensor in the information processing apparatus of the monitoring operator and displayed on the screen.

  The thinning state determination means receives plant / inspection site information from the plant information database. For example, the name of the plant to be inspected, the name of the site to be inspected, design data (the design outer diameter of the pipe, the design required wall thickness, the material, etc. ), Past inspection history, similar plant data, etc. are input.

  The laser measuring means 13 moves while sequentially measuring the surface of the fin 11, the wall surface of the fin tube 15, and the surface of the fin 11 by the movement of the moving means 12, and measures the thinning state.

  Thus, according to the present Example, the corrosion and the thickness reduction state of the fin 11 and the fin tube 15 can be evaluated continuously, without disassembling or opening the heat exchanger etc. of a boiler installation.

Here, when laser measurement is performed, a fixing means for temporarily fixing the moving means 12 is provided. This fixing means is performed by a gripping portion 25 that grips the fin end portion 11 a provided on the caterpillar 24. For example, when the gripping portion 25 is moved by an electromagnet, a shape memory alloy, or the like, the interval is widened to be a predetermined interval, and when fixing, the interval is narrowed to grasp the fin end portion 11a. I am doing so.
In the present invention, the fixing means is not limited as long as the fin end portion 11a is gripped and fixed.

1-3 and FIGS. 1-4 are schematic views of the caterpillar gripping portion.
For example, as illustrated in FIG. 1C, the grip portion 25 is tapered, and the fin end portion 11 a of the fin 11 is sandwiched between the opposing inclined surfaces 25 a, and the electromagnet 28 provided inside the grip portion 25 causes the fin 11 to The fin end portion 11a is fixed.

  Moreover, as shown in FIGS. 1-4, you may make it hold | grip the holding part 11a of the fin 11 by making the shape of the holding part 25 into a trapezoid cross section.

  As described above, according to the present embodiment, by moving along the fin tube 15, it is possible to evaluate the corrosion and thinning of the fin tube 15 without disassembling or opening the boiler equipment, for example.

FIGS. 4A and 4B are diagrams illustrating a state where the half circumference of the fin is inspected. FIG. 4-3 is a schematic view of a process for inspecting the half circumference of the fin.
Laser light emitted from the laser displacement meter is transmitted and moved between the fins of the spiral fin tube. Then, as shown in FIG. 4A, when the halfway of the fin 11 is inspected by the moving means body 40, the forward path moves to the next fin. In the return path, the opposite half of the forward path is inspected. Thereby, the thinning between the fins 11 and the fins 11 and the corrosion distribution can be evaluated.

  Also, as shown in FIG. 4B, two moving means bodies 40 may be provided via the connecting means 45, and the half circumference may be inspected in a state where the connecting angle between the two is fixed. The moving means 40 is sandwiched from both sides by a roller 41a. The angle (α) is corrected by adjusting the connecting means 45. In addition, when moving to the fin on the opposite side, the inspection may be performed by adjusting the angle on the opposite surface.

As shown in FIG. 4B, the fins are moved by an expansion / contraction part 41 provided in the moving means main body 40 and movement / fixation parts 42 and 43 provided at both ends of the expansion / contraction part 41. .
First, of the first moving / fixing portion 42 and the second moving / fixing portion 43, the second moving / fixing portion 43 sandwiches the fin 11. In this state, the first moving / fixing portion 42 does not sandwich the fin 11. Next, the telescopic part 41 is contracted and the first moving / fixing part 42 is moved to the right side in the figure.
For example, a hydraulic, pneumatic or electric actuator can be used for the expansion / contraction part 41. After moving a predetermined distance, laser measurement is performed.
Thereafter, the fins 11 are sandwiched using the first moving / fixing part 42, the expansion / contraction part 41 is extended, the second moving / fixing part 43 is moved by a predetermined distance, and further moved to the right in the figure by a predetermined distance. Thus, it is possible to measure the half circumference of the fin 11 by moving a predetermined distance.

FIG. 5 is a diagram illustrating a movement state between the fins.
Since the fins are adjacent to each other, the fins are moved at the closest part.

FIGS. 6A to 6C are schematic diagrams illustrating the movement to the adjacent fins.
As shown in FIG. 6A, the case where two fin tubes 15-1 and 15-2 positioned at the top and bottom are inspected first will be described.
6A is a heat transfer tube or evaporation tube thinning state monitoring device 10A having a shaft 50 in a state where the inspection of the fin tube 15-1 located on the lower side of the drawing has been completed.
Next, as shown in FIG. 6B, the shaft 50 is inclined and the front half of the thinning state monitoring apparatus 10A is lifted to the fin tube 15-2 side. When this is lifted, the fin end portion 11a of the fin 11 of the fin tube 15-2 is gripped by the grip portion 25.
Thereafter, as shown in FIG. 6-3, the shaft 50 is moved toward the fin tube 15-2 so that the shafts are parallel to each other, and the fin 11 on the fin tube 15-2 side is monitored.
The laser measuring means 13 may have a mechanism for reversing the irradiation of the laser light so as to perform measurement on the opposite side. Two laser measuring means may be provided.

FIG. 7A to FIG. 7B are other schematic views showing a state of moving to adjacent fins.
As shown in FIG. 7A, the case where two fin tubes 15-1 and 15-2 positioned at the top and bottom are inspected first will be described.
7A is a heat transfer tube or evaporation tube thinning state monitoring device 10A having a long shaft 50 in a state where the inspection of the fin tube 15-1 located on the lower side of the drawing is completed.
A rotating shaft 51 in which a spiral groove is formed is provided inside, and the thinning state monitoring device 10 </ b> A is supported by a long shaft 50 that is supported by the rotating shaft 51.
Next, as shown in FIG. 7-2, when the rotating shaft 51 is rotated in a state where the shaft 50 is fixed to, for example, the heat exchanger side, the entire thinning state monitoring device 10A is lifted to the fin tube 15-2 side. It is done. When this is lifted, the fin end portion 11a of the fin 11 of the fin tube 15-2 is gripped by the grip portion 25.
Thereafter, the fin 11 on the fin tube 15-2 side is monitored.

FIGS. 8-1 to 8-5 are other schematic views showing a state of moving to adjacent fins.
As shown in FIG. 8A, the case where the two fin tubes 15-1 and 15-2 positioned at the top and bottom are inspected first will be described. In this embodiment, only the caterpillar is shown, and the laser measuring means 13 is omitted from the drawing.
FIG. 8A shows a thinning state monitoring device 10A for a heat transfer tube or an evaporation tube in a state where the inspection of the fin tube 15-1 located on the lower side of the drawing is completed.
This embodiment shows a case where there are four wheels, and the first to third driven wheels 23-1 to 23-3 and the driving wheel 22 are connected by a plurality of link mechanisms 53.
Next, as shown in FIG. 8B, the front first driven wheel 23-1 is lifted upward by a driving means (not shown), and the link mechanism 53 is lifted to the fin tube 15-2 side. When this is lifted, the fin end portion 11a of the fin 11 of the fin tube 15-2 is gripped by the grip portion 25.
Next, as shown in FIG. 8C, the second driven wheel 23-2 is lifted upward by the link mechanism 53. When this is lifted, the fin end portion 11a of the fin 11 of the fin tube 15-2 is gripped by the grip portion 25.
Similarly, as shown in FIGS. 8-4 to 8-5, the third wheel 23-3 and the drive wheel 23 are also lifted up sequentially by the link mechanism 53, so that the entire thinning state monitoring apparatus 10A becomes the fin tube 15-. Can be lifted to 2 sides. When this is lifted, the fin end portion 11a of the fin 11 of the fin tube 15-2 is gripped by the grip portion 25.
Thereafter, the fin 11 on the fin tube 15-2 side is monitored.
In this embodiment, the shaft 50 as shown in FIG. 7A is not used, and transfer between the fins in a self-propelled manner is possible.

A thinning state monitoring device for a heat transfer tube or an evaporation tube according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 9 is another schematic diagram of a thinning state monitoring device for a heat transfer tube or an evaporation tube.
As shown in FIG. 9, the heat transfer tube or evaporation tube thinning state monitoring apparatus 10B uses a worm gear 70 as the moving means 12 that moves along the fins of the heat transfer tube or evaporation tube.
As the worm gear 70 advances, it moves between the fins 11, and by continuously reading the position of the reflecting surface from the fin 11 surface and the tube wall of the fin tube 15 with a laser displacement meter, the thickness reduction state thereof is obtained. I am trying to measure.

  As described above, according to the thinning state monitoring apparatus for a heat transfer tube or an evaporation tube according to the present invention, the thinning state of the heat transfer tube or the evaporation tube can be observed without disassembling the equipment.

10A, 10B Thinning state monitoring device of heat transfer tube or evaporation tube 11 Fin 12 Moving means 13 Laser measuring means 14 Cable means 15 Fin tube

Claims (5)

A monitoring device for monitoring a thinning state of a heat transfer tube or an evaporation tube,
Moving means moving along the fins of the heat transfer tubes or the evaporation tubes;
Laser measuring means provided in the moving means for laser measuring the thinned state of the surface of the heat transfer tube or the evaporation tube;
Cable means having a light guide path for introducing laser light into the laser measuring means and a lead-out path for transmitting reflected light;
A thinning state monitoring device for a heat transfer tube or an evaporation tube, comprising a thinning state determination means for comparing the laser measurement data with past data or standard data to determine a current thinning state . In claim 1,
A thinning state monitoring device for a heat transfer tube or an evaporation tube, comprising a fixing means for temporarily fixing the moving means. In claim 1 or 2,
The moving means includes a moving means main body, a driving wheel and a driven wheel pivotally attached to the moving means main body,
An endless track belt stretched between the driving wheel and the driven wheel,
A thinning state monitoring device for a heat transfer tube or an evaporation tube, characterized in that it has gripping means for gripping fin ends at every fin interval on the surface of the endless track. In claim 1 or 2,
A thinning state monitoring device for a heat transfer tube or an evaporation tube, wherein the moving means is a worm gear. In any one of Claims 1 thru | or 4,
The laser measuring means measures the thinning state while sequentially moving the fin surface, the fin tube wall surface, and the fin surface by the movement of the moving means, and the thinning state monitoring device for the heat transfer tube or the evaporation tube.

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