JP2565705B2 - Transfer device between heat transfer tubes - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat transfer tube group moving device, and particularly for moving between heat transfer tube groups of a boiler, which is difficult to perform manually, to perform cleaning and inspection. The present invention relates to a preferable boiler heat transfer tube group transfer device.

[Conventional technology]

As shown in FIG. 9, a large-scale boiler, for example, a boiler used in a thermal power plant has a furnace 2 arranged in a protective wall 1, a burner 3 is provided on a lower side wall of the furnace 2, and a furnace on the upper and outlet sides. Heat transfer tube blocks 4 and 5 are arranged in the inside. A hopper 6 for storing combustion ash and the like is provided at the bottom of the furnace 2. The heat transfer tube block 4 is, for example, a reheater and a superheater, and includes heat transfer tube groups A and B having different piping intervals. The heat transfer tube block 5 is, for example, a superheater or a economizer.

The heat transfer tube block 4 is orthogonal to the flow direction of the combustion gas, that is, hung from the ceiling portion, and the lower end is in a suspended state without being fixed. The heat transfer tube block 4 is composed of two blocks A and B, which are arranged in a high temperature gas portion where the combustion gas temperature is high, and the heat transfer tube block 5 is arranged in a low temperature gas portion where the combustion gas temperature is low. Has been done. The heat transfer tube block 4 has a heat transfer area smaller than that of the heat transfer tube block 5 so that heat can be effectively obtained from the combustion gas. Further, in the blocks A and B of the heat transfer tube block 4, as shown in FIG. 10 (plan view), the tube intervals 7a and 7b have different heat transfer areas, and the heat transfer area is increased toward the downstream side.

In the above structure, when the burner 3 burns gas or liquefied fuel in the furnace 2, heat exchange is performed in the process in which the combustion gas sequentially passes through the heat transfer tube blocks 4 and 5.
Low-temperature steam or water is supplied to the heat transfer tube blocks 4 and 5, and the steam whose temperature has been raised by heat exchange is taken out and supplied to a steam turbine (not shown). Heat transfer tube block 4
The combustion gas of the furnace after the heat exchange by 5 and 5 is sent to a dust remover or the like.

Regarding the boilers for power plants, the Electricity Business Law requires that regular inspections be carried out. At the time of this periodic inspection, the boiler operation is stopped, the prescribed contents are inspected, and the scale on the heat transfer tube surface of the hot gas part is removed in order to maintain safe and efficient heat exchange of the boiler. We also carry out cleaning and inspections such as measuring wall thickness.

(A) By hand Materials are carried into the furnace from a manhole with a diameter of about 500 mm provided on the wall surface etc. of the furnace 2, and scaffolds between the heat transfer tube groups are assembled, and workers check the scaffold while moving. to clean up.

(B) In the case of mechanization A rail that moves in the furnace width direction is stretched over the lower end of the combustion gas passage, a post equipped with an arm is erected on this rail, and cleaning is performed by a work device provided at the tip of the arm. To do.

[Problems to be solved by the invention]

However, the conventional means for cleaning and inspecting the heat transfer tube group of a boiler has a problem in health and safety because it is a work in a high place and high dust environment when it is manually performed. Difficulties in carrying in and out of materials. In addition, even if it is mechanized, it is necessary to stably attach the work device to the heat transfer tube, so the arm must have appropriate rigidity, which increases the arm's own weight and makes the device for moving the arm a large-scale system. I have no choice.

Further, due to the structure of the boiler, the inclination of the lower end of the suspension length changes depending on the position of the boiler. Therefore, the arm moving mechanism needs to be replaced each time. Furthermore, when the machine was carried into the boiler, it had to be done from a manhole with a diameter of 500 mm, and since this work was done manually, a lot of incidental work such as mounting and removing the arm moving mechanism was required.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a small-sized and light-weight heat transfer tube group moving device that can move between heat transfer tube groups and can work the heat transfer tubes according to working conditions. is there.

[Means for solving problems]

In order to achieve the above-mentioned object, the heat transfer tube group moving device of the present invention uses a rotating roller to rotate each of two heat transfer tubes out of a plurality of heat transfer tubes arranged in parallel at a predetermined interval. A pair of gripping mechanism parts for gripping, a drive mechanism part for rotating the rotating roller to move the gripping mechanism part in the longitudinal direction of the heat transfer tube, and both ends of the gripping mechanism part orthogonal to the longitudinal direction of the heat transfer tube. It is provided with a pair of connecting frames that connect between them, and a working unit that is arranged within a range surrounded by the pair of gripping mechanism parts and the pair of connecting frames and is movable within the range.

[Action]

The work unit supported by the gripping mechanism section in the front-rear direction and in the up-down direction (or in the front-rear direction, left-right direction) performs cleaning, inspection, and the like while moving the heat transfer tubes facing each other. When the work in the area defined by the work unit is completed, the gripping mechanism moves, and the work unit is transported to the next work area. Since this moving device does not require posts or rails, work can be performed efficiently and unmanned.

Example of Invention

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a front view and II showing an embodiment of the present invention.
-II is a sectional view taken along the arrow.

The distance L within the heat transfer tube 8 of the heat transfer tube block 4 (for example,
A pair of gripping mechanism parts 10a and 10b are attached to the two heat transfer tubes 8a and 8b in the entire width of the heat transfer tube). The gripping mechanism unit 10a includes connection frames 11 and 12 that are detachable from the gripping mechanism unit 10b.
Are fixed to the front and back of the upper and lower parts. Gripping mechanism 10a, 1
The heat transfer tubes 8a and 8b are press-contacted and gripped from three directions at a plurality of positions in the length direction of 0b, and the rotatable rotating roller 13 is provided at one position.
They are arranged individually.

A driving unit 14 is provided in the gripping mechanism unit 10a for driving each of the rotating rollers 13. The drive unit 14 includes a motor 15 as a drive source, and the rotation of the motor 15 is transmitted to the rotary roller 13 via a reduction mechanism and a transmission mechanism (not shown) including a gear, a belt and the like. The motor 15 is attached to the gripping mechanism 10b.
When transmitting the rotation, the rotating shaft (not shown) is mounted inside the connecting frames 11 and 12. In addition, 18
The driving force does not have to be transmitted to all the individual rotating rollers 13, and it may be selected according to the weight of the moving device and the pressure contact force of the rotating rollers 13, but all the rollers used for driving rotate at the same speed. There is a need.

Drive units 16 and 17 are mounted on each of the connection frames 11 and 12 so as to be movable in the longitudinal direction, and screw shafts 18a and 18b are connected between the drive units 16 and 17. Therefore,
The drive unit 16 and the drive unit 17 move integrally. Drive unit 16 and
The work unit 19 to be described later is provided on both sides of the heat transfer tube block 4 so that the work unit 19 can be inspected and cleaned at the same time. Therefore, four units are provided on each of the front side and the back side.

Between the screw shafts 18, there is provided a working unit 19 including a rotating brush for removing scale adhering to the surface of the heat transfer tube 8 and a contact sensor for measuring the thickness of the scale (further, it is not removed only by the brush). A laser beam generator for cracking the scale may be provided). As shown in FIG. 2, this working unit 19 is provided in a pair so as to sandwich the heat transfer tube group 8.
Further, a cable hose 21 in which a power supply cable and a dust collecting hose for sucking the scale removed by the rotating brush are integrated is connected to the gripping mechanism 10a, and a working unit is further provided via the gripping mechanism 10a and the cable hose 22. 19 is connected to the cable hose 21. Cable hose 21
Is drawn out of the furnace and connected to the commercial power supply line and vacuum device.

With the above-mentioned structure, when mounting on the heat transfer tube group, the manhole provided in the furnace 2 as shown in FIG.
Move from 23 to the furnace. At this time, first, the gripping mechanism unit 10
One of a and 10b, for example, the gripping mechanism portion 10a is inserted into the connecting frames 11 and 12 while the gripping mechanism portion 10a is in contact with one end of the heat transfer tube group, and the rotating roller 13 is attached to the other side end of the heat transfer tube group. The gripping mechanism portion 10b is fixed to the connecting frames 11 and 12 while being pressed against the. Note that FIG. 4 is a side view seen from the gas flow direction in FIG.

In this state, the control unit 24 connected to the cable hose 21
It is possible to freely move the heat transfer tube group 4 to the whole area by operating the switch. For example, the driving unit 14 is driven to move the gripping mechanism units 10a and 10b to the upper end of the heat transfer tube group 4 and stop. Then, the driving units 16 and 17 are moved to the left ends of the coupling frames 11 and 12, for example, and then stopped. In this state, the working unit 19 is moved from the upper end to the lower end (or vice versa) for cleaning and inspection. When the working unit 19 has finished moving, the driving units 16 and 17 are moved rightward by the working width. Repeating such operations, the gripping mechanism section
When the driving portions 16 and 17 come into contact with 10b, the moving device 20 is lowered by the height H shown in FIG. After lowering, the above operation is repeated to sequentially move the work device 19.

By appropriately driving the driving units 14, 16 and 17 in this way, the moving device 20 can sequentially move the entire length of the heat transfer tube group 4, and by driving the working unit 19 in accordance with the movement, the heat transfer tube group 4 is moved. Cleaning and inspection of the entire surface of the heat transfer tube 8 in the entire area 4 can be automatically performed without any manual labor. ON / OFF control of the driving units 14, 16 and 17 is performed by the gripping mechanism unit 1.
Drive control is performed based on the outputs of the position detection sensors (not shown) provided at the moving side ends of the working units 19 and 0a, 10b.

In the above description, an example is shown in which it is attached to the heat transfer tube group 4 of the hanging piece, but it can also be attached to the heat transfer tube group 5 placed horizontally as shown in FIG.

In this case, first, the gripping mechanism 10a is placed on the uppermost heat transfer tube 8 of the heat transfer tube group 5, then the gripping mechanism 10b is inserted into the connecting frames 11 and 12 from below, and the upper end of the gripping mechanism 10b is inserted into the heat transfer tube. While being in contact with the lower end of the group 5, the connecting frame 11 and
Fix to 12. The driving units 14, 16, 17 and the working unit 19 can be driven by operating the vertical movement of FIG. 1 in the horizontal direction, and therefore, redundant description will be omitted.

Further, the moving device 20 described above can operate a plurality of units at the same time. This example is shown in FIG. In FIG. 6, a transfer device is provided for each of the heat transfer tube groups 4 and 5.
Install 20. In addition, a service section 25 and a moving device that centrally control all the moving devices 20 on a stage 24 provided outside the furnace to monitor the work status and manage inspection results
A dust collection section 26 is provided for sucking the scale removed by the 20 rotating brushes through the cable hose 21.

Cable hoses 21 from each of the transfer devices 20 are pulled out of the furnace through manholes 23 and 27, the cables in which are connected to the service section 25 and the hoses to the dust collection section 26. The service section 25 controls each of the driving units 14, 16, 17 and the work unit 19 based on the sensor output from each moving device 20 and also the work unit.
The scale adhesion state, the removal state, etc. and the position information etc. measured by the contact sensor provided at 19 are displayed on the monitor and printed out. Dust collection section 26
Incorporates a vacuum pump and sucks the scale removed by each moving device 20 through a hose.

By thus installing a plurality of moving devices 20 in the furnace and operating them simultaneously, it is possible to efficiently perform cleaning and inspection in a short time, and thus it is possible to greatly shorten the idle period of the boiler. . In addition, since no labor is required to move the moving device 20, there is no risk that the worker will be put in a dangerous situation or the scale dust will harm the health unlike the conventional case.

FIG. 7 is a block diagram showing a schematic structure of the service section 25.

The moving device 20 includes a position sensor 28 that detects the position of each of the gripping mechanism units 10a and 10b, the driving units 16 and 17, and the working unit 19, and the output of each sensor is input to the service section 25.

Service section 25, input interface 10
1, a memory 102, a CPU 103, a monitor device 104, an output interface 105, a printer 106, a driver 107, and a bus 108 that connects each interface, the memory 102, and the like with the CPU 103 as a core.

The input interface 101 sends the data detected by the position sensor 28 to the bus 108. The memory 102 stores the data from the input interface 101 and the processing result, and also stores a program for operating the CPU 103. The monitor 104 displays the processing and control results of the CPU 103, and a CRT display or liquid crystal display is used. The output interface 105 outputs print information or control information to the printer 106 or the driver 107 according to the processing result by the CPU 103. The printer 106 prints processing results (heat transfer tube diameter, scale removal result, etc.). Driver 107
Controls a motor 29A for moving the gripping mechanism units 10a, 10b, a motor 29B for moving the driving units 16 and 17, and a motor 29C for moving the working unit 19 according to the processing result of the CPU 103.

The members 101 to 103, 105 and 107 having the configuration shown in FIG.
The computer section may be built in each mobile device 20, and in the service section 25, a host computer may be provided only for centrally managing each mobile device 20. In this way, the processing load in the service section can be lightened, the responsiveness can be improved, and it is not necessary to draw the signal line from the position sensor 28 out of the furnace, and the wiring can be simplified. Further, the mobile device 20 can be automatically driven independently without connecting to the service section 25.

In FIG. 7, the CPU 103 takes in the output of the position sensor 28 at a predetermined timing and stores it in the memory 102. From the output state of this sensor, the CPU 103 grasps the movement state of the working unit 19 in addition to the position of the moving device 20 and the driving units 16 and 17,
For example, to execute the processing shown in FIG.
Control 9C. Further, the inspection information obtained with the movement of the work unit 19 is managed and displayed on the display or printed out as necessary.

FIG. 8 is a flow chart showing an example of controlling the mobile device 20 having the configuration shown in FIG. 1 by the CPU 103 shown in FIG.

First, the moving device 20 is attached to the heat transfer tube block as described above. After that, the moving device 20 is moved to the upper end of the heat transfer tube block, and the driving units 16 and 17 are moved to the left end, the working unit.
Move 19 to the upper end (step 31). When the completion of this initial setting is completed (step 32), the rotary brush and the vacuum pump of the dust collecting section 26 are driven (step 33), and the working unit 19 is lowered (step 34). When the lowering of the working unit 19 reaches the limit position (step 35), the vacuum pump and the rotary brush are stopped (step 36).

After that, the driving units 16 and 17 are moved to the right by the working width (step 37). Upon completion of this movement (step 38), the rotary brush and vacuum pump are driven and the working unit 19 is raised (step 39). When the working unit 19 reaches the limit position (step 40), the working unit 19, the rotary brush and the vacuum pump are stopped (step 41). Here, it is determined whether or not the drive units 16 and 17 have moved to the right to the position where they come into contact with the gripping mechanism unit 10b (step 42).

If the limit position has not been reached, the processes after step 37 are executed again, and if the limit position has been reached, it is determined whether or not the moving device 20 can be lowered (step 43). If possible, lower the moving device 20 by a height H (step 44),
When the end of the descent is detected (step 45), the descent of the moving device 20 is stopped (step 46), and the processes after step 33 are executed.

On the other hand, when it is detected in step 43 that the moving device 20 has reached the lower limit position, the rotary brush, the gypsum method, and all the motors are stopped, and the moving device 20 remains stopped at that position. Therefore, the worker removes the moving device 20 from the mounted heat transfer tube block, replaces it with another heat transfer tube block, or carries it out of the furnace.

In the above description, the boiler heat transfer tube is targeted, but the present invention is not limited to this, and the present invention can be applied to all tubular body blocks that require some work.

〔The invention's effect〕

As described above, according to the present invention, it is possible to freely move between the heat transfer tube blocks, which are difficult to manually work, and it is possible to easily carry in and out through a manhole having a small diameter, and work efficiency and safety are greatly improved. Can be improved.

[Brief description of drawings]

1 and 2 are a front view and an embodiment showing the present invention.
II-II arrow sectional views, FIG. 3 and FIG. 4 are front and side views showing a mounting state on the heat transfer tube block of the embodiment of FIG. 1, and FIG. FIG. 6 is a perspective view showing a state of being mounted on a heat transfer tube block, FIG. 6 is a perspective view showing an example of a system in which a plurality of moving devices according to the present invention are installed, and these are centrally controlled, and FIG. 7 is a service shown in FIG. Block diagram showing details of section 25, FIG.
FIG. 9 is a flow chart showing an example of processing by the CPU 103, FIG. 9 is a schematic sectional view showing an example of a large-sized boiler having a suspension type heat transfer tube group, and FIG. 10 is a heat transfer tube group 4 used in the boiler of FIG. FIG. 3 is a cross-sectional view showing the piping situation of FIG. 2 ... Furnace, 4, 5 ... Heat transfer tube block, 8 ... Heat transfer tube, 10a, 10b ... Gripping mechanism part, 11, 12 ... Connection frame, 13 ... Rotating roller, 14, 16, 17 ... Drive unit, 15 ……
Motor, 18a, 18b …… Screw shaft, 19 …… Work unit, 21 …… Cable hose, 25 …… Service section, 26 …… Dust collection section, 103 …… CPU.

Claims (3)

(57) [Claims] 1. A pair of gripping mechanism parts for gripping each of two heat transfer tubes of a plurality of heat transfer tubes arranged in parallel at a predetermined interval by a rotating roller, and rotating the rotating roller. And a pair of connecting frames that are orthogonal to the longitudinal direction of the heat transfer tube and connect both ends of the gripping mechanism section, and a pair of the gripping mechanisms. An apparatus for moving between heat transfer tube groups, comprising: a working unit that is arranged within a range surrounded by the section and a pair of connecting frames and is movable within the range. 2. A drive means for moving the working unit is arranged in a connecting frame, and the working unit includes a removing means for removing scale adhering to the heat transfer tube and a detecting means for measuring the thickness of the scale. The heat transfer tube group moving device according to claim (1). 3. The heat transfer tube group moving device according to claim 1, wherein the work unit has a structure in which a pair of the work units is provided on both surfaces of the heat transfer tube. .