KR20030018380A - Electropolishing Device of the Internal surface of the chanel head of the steam generator - Google Patents

Abstract

PURPOSE: An electropolishing device is provided to electropolish a round shape or a edge part of a channel head inside without entering a narrow space by controlling the electropolishing device remotely. CONSTITUTION: A menu plate(20) is inserted to a manway(12) or a coolant passage(14) of a channel head(10) moving freely. A head is connected to the menu plate hingedly, and is composed of an electrode, an electrolyte nozzle, a washing liquid nozzle and a distance recognizing sensor. A electrolyte supplying device(60) is connected to the electrolyte nozzle and a washing liquid supplying device(70) is connected to the washing liquid nozzle. An electrolyte processing device(80) receives the washing liquid and electrolyte through a receiving pipe. A power supply(100) is connected to the menu plate, the electrolyte supplying device, the washing liquid supplying device and the electrolyte processing device. A remote controller is connected to the power supply controlling the power supply, the menu plate, and the head.

Description

Electropolishing Device of the Internal Surface of the chanel head of the steam generator

The present invention relates to an electropolishing apparatus for a steam generator channel head, and more particularly, to an electropolishing apparatus for electropolishing a channel head by operating an apparatus at a remote location without entering a work place in a narrow space or a corner portion.

The nuclear steam generator channel head serves as a channel that sends the primary coolant heated in the reactor to the heat pipe, and serves as a passage for sending the secondary coolant that turns the turbine and the primary coolant that has undergone heat exchange back to the reactor. The inner surface of the channel head in contact with the coolant is clad with stainless steel, and is separated into a hot part and a cold part by an divider plate made of Inconel.

When the channel head and divider plate in contact with the coolant are in contact with the coolant, chemicals, foreign substances or radioactivity in the coolant are accumulated due to the rough surface condition. To prevent this, the inner surface of the channel head and the divider plate are used.

However, the surface grinding state of the channel head and the divider plate by the above-described grinding is rough and the smoothness is not good, there is a problem that the radioactivity is accumulated during the operation of the nuclear power plant, corrosion damage, and the like.

In order to solve this problem, electrolytic polishing is used in recent years to obtain a better surface state than the grinding method.

Recently, US patent US 4,883,576 discloses a patent for the electropolishing apparatus on the inner surface of a nuclear steam generator channel head.

The patent is to polish the inner surface of the steam generator channel head by using the transfer device and the electrolytic polishing head, and the edges such as the inner surface of the channel head and the boundary of the divider plate can be uniformly polished using the rectangular electrode. none.

The technical problem to be achieved by the present invention is to solve the above problems, the operator does not enter the narrow working space to control the device at a long distance, evenly polished the inner surface of the corner or round channel head, the work progress situation The present invention provides an electropolishing apparatus that can be understood.

1 is a schematic view of an electropolishing apparatus of the present invention,

2 is a block diagram of an electrolyte supply device of the present invention,

3 is a block diagram of a cleaning solution supply device of the present invention,

4 is a configuration diagram of an electrolytic solution processing apparatus of the present invention;

5 is a front view of the head of the present invention,

6 is a side view of the head of the present invention;

7 is a schematic representation of the electrode of the present invention.

※ Explanation of main code in drawing

10: channel head, 11: inside,

12: manway, 13: divider plate,

14: cooling water passage, 20: menu plate,

21: body, 22: connecting rod,

23: hinge pin, 30: head,

31 electrode, 32 insulator,

35: electrolyte flow passage, 36: electrolyte nozzle,

37 valve, 38 cleaning liquid nozzle,

39 frame, 40 distance sensor,

41: guideway rack, 42: moving device,

43: coupling table, 50: monitoring camera,

60: electrolyte supply device, 61: pump,

62: electrolyte storage tank, 63-1: flow sensor,

63-2: flow sensor, 64: electrolyte supply pipe,

70: washing liquid supply device, 71: pump,

72: washing liquid storage tank, 73-1: flow sensor,

73-2: flow sensor, 74: cleaning liquid supply pipe,

80: electrolyte treatment device, 81: suction pump,

82: storage tank, 83: recovery pipe,

84: funnel, 90: remote controller,

100: power.

The present invention for achieving the above-described technical problem is inserted into the manway or the cooling water passage of the channel head according to the electropolishing work conditions, the plate plate free to move up and down, the electrode rotated at the end of the menu plate, the electrode surrounded by an insulator, A head consisting of an electrolyte nozzle, a washing liquid nozzle, and a distance sensor, an electrolyte supplying device and a cleaning liquid supplying pipe connected to the electrolyte nozzle and the cleaning liquid nozzle of the head, and a washing liquid on the inner surface of the channel head with a pipe inserted into the cooling water passage, and an electrolyte solution. Electrolyte treatment device for suctioning, and + pole is connected to the channel head,-pole is connected to the electrode, the menu plate, the electrolyte supply device, the power supply connected to the cleaning solution, the electrolyte treatment device, and connected to the power supply, the menu Plate, consists of a remote controller to control the operation of the head.

Hereinafter will be described in detail with the drawings according to an embodiment of the present invention.

1 is a schematic diagram of an electropolishing apparatus of the present invention.

The menu plate 20 has a body 21 is inserted into the channel head 10 through the manway 12 of the channel head 10.

In the above embodiment, the menu plate 20 is inserted into the channel head 10 through the manway 12 or the menu plate 20 is inserted into the channel head 10 through the cooling water passage 14. You may be.

The connecting rod 22 is pivotally coupled to the channel head body 21 by the eye hinge hinge pin 23, and an electrode 31 surrounded by an insulator 32 is connected to the end of the connecting rod 22, and an electrolyte solution is formed on the inner surface of the channel head 10. The head 30 is composed of a spraying electrolyte nozzle 36, a washing liquid nozzle 38 for spraying the washing liquid for spraying the sprayed electrolyte, and a distance recognition sensor 40 for recognizing the distance.

The electrolyte nozzle 36 and the cleaning liquid nozzle 38 are coupled with an electrolyte supply device 60 and a cleaning solution supply device 70 connected to the electrolyte supply pipe 64 and the cleaning solution supply pipe 74.

2 is a configuration diagram of an electrolyte supply device, and FIG. 3 is a configuration diagram of a cleaning solution supply device.

The electrolyte supply device 60 includes an electrolyte supply pipe 64 connected to an electrolyte nozzle 36 for injecting an electrolyte, a pump 61 serving as a driving source for supplying an electrolyte, and an electrolyte storage tank 62 for supplying an electrolyte. Flow sensors 63-1 and 63-2 are provided between the storage tank 62 and the pump 71 and between the pump 71 and the electrolyte nozzle 36.

In addition, the washing liquid supply device 70 also includes a washing liquid supply pipe 74 connected to the washing liquid nozzle 38 for spraying the washing liquid, a pump 71 which is a driving source for supplying the washing liquid, and a washing liquid storage tank 72 to which the washing liquid is supplied. Flow sensors 73-1 and 73-2 are provided between the washing liquid storage tank 72 and the pump 71 and between the pump 71 and the washing liquid nozzle 38.

The flow sensors 63-1, 63-2, 73-1, and 73-2 sense the flow rate and transmit a signal to the remote controller 90, and the pump 61 in the remote controller 90. (71) When the flow rate detected by the front flow sensor 63-1, 73-1 and the rear flow sensor 63-2, 73-2 has a large difference, the pumps 61, 71 are driven. Stop it.

This operation is to prevent leakage of electrolyte or washing liquid due to breakage of the supply pipe due to the flow rate difference.

Strongly acidic solution is used for the electrolyte and deionized distilled water is used for washing the electrolyte.

4 is a configuration diagram of an electrolytic book processing apparatus.

The electrolyte treatment apparatus 80 includes a recovery pipe 83 connected to an inner bottom portion of the channel head through a cooling water passage 14 formed in the channel head 10, and a storage tank 82 formed at an end of the recovery pipe 83. It consists of, the suction pipe 81 is applied on the recovery pipe line 83 to suck the suction to suck the electrolyte and the cleaning liquid inside the channel head by a short circuit of the power supply.

In the above embodiment, the electrolyte treatment apparatus 80 may be inserted into the channel head through the manway 12 or the configuration inserted into the channel head through the cooling water passage 14.

A plurality of recovery pipes 83 may be formed, or a recovery pipe 83 may be formed below the head 30, and a funnel 84 may be formed at an end portion thereof to facilitate collection of the electrolyte solution and the washing solution.

5 to 6 are front and side views of the head 30.

Head 30 is rotated 360 ° to the end of the connecting plate 22 of the menu plate is coupled to the extended coupling 43 and the coupling 43 is the servo motor (not shown) under the control of the remote control panel 90 Rotated by operation.

The cleaning nozzle 38 and the electrolyte nozzle 36 forming the head are coupled to the same frame 39, and the monitoring camera 50 is coupled to the upper side of the frame 39.

Under the frame 39, electrodes 31 stacked with silicon glass, which is an insulator 32, are coupled.

The electrode 31 is a φ8 × 200㎜ standard of the same material is used to form an electrolyte flow passage 35 in the electrode 31 for efficient work during electrolytic polishing and the nozzle 33 is formed at the end thereof In addition, an electrolyte supply pipe may be connected to the electrolyte flow passage 35.

In addition, the electrode 31 may be coupled to the guideway rack 41 to be slidably moved and used to be transported back and forth by the transfer device 42.

The transfer device 42 is configured by combining a rack (not shown) and a pinion gear (not shown) with a small motor (not shown) under the control of the remote control panel 90, and using the transfer device 42 by using the transfer device 42. In this case, a flexible corrugated pipe 34 is coupled to the valve 37 coupled on the electrolyte supply pipe 64 between the electrolyte flow passage 35 of the electrode 31 and the electrolyte supply pipe 64.

In addition, a distance recognition sensor 40 is coupled above the electrolyte nozzle 36 of the electrolyte supply pipe 64 to recognize the distance between the channel head 10 and the head 30 and transmit a signal to the remote controller 90. .

FIG. 7 is a schematic diagram of the electrode showing the coupling state between the electrolyte flow passage 35 and the electrode 31.

As shown in FIG. 3, an electrolyte flow passage 35 is installed inside the electrode 31, and a plurality of injection nozzles 33 are formed in the flow passage 35.

Hereinafter will be described the operation of the present invention.

In the case of electropolishing the inner surface of the channel head 10 using the electropolishing apparatus of the present invention, the remote control panel 90 is used to adjust the proper recognition distance and operate the menu plate 20 and set the amount of the electrolyte supply at the same time. After that, when the power supply 100 is connected, the electrolyte supply device 60, the cleaning solution supply device 70, and the electrolyte processing device 80 are operated.

In accordance with the operation of the electrolyte supply device 60, the electrolyte is sprayed onto the inner surface of the channel head 10 through the nozzle 33 formed on the electrolyte flow path 35 installed in the electrolyte nozzle 36 and the electrode 31. At the same time, the electrode 31 connected to the power supply is energized to start electrolytic polishing.

According to the operation of the menu plate 20, the electrode 31 coupled to move forward and backward on the guideway rack 41 pivotally coupled to the end of the menu plate 20 moves and moves the inner surface of the channel head 10. In the area where grinding is performed and the inner surface is rounded or in poor crop conditions such as the divider plate 13 boundary surface, the head 30 is rotated, and then the electrode transfer device 46 is operated so that only the electrodes protrude in front of the head so that the corners are uniform. Polish

In the washing liquid nozzle 38, the washing liquid is sprayed, and after completion of the electrolytic polishing operation, the electrolyte remaining on the inner surface is washed with distilled water. It is recovered.

The distance recognition sensor 40 fixed to the frame 39 during the electropolishing operation maintains the distance between the electrode 31 and the inner surface of the channel head 10 according to the set value to prevent the collision between the electrode 31 and the inner surface.

In addition, the monitoring camera 50 fixed to the front end of the guideway rack 41 monitors the electropolishing state so that the operator can check the electropolishing state on the screen provided in the remote controller 90.

In addition, the flow rate sensor (63-1) (63-2), (73-1) (73-2) installed in the supply pipe of the electrolyte supply device 60 and the cleaning solution supply device 70 detects the flow rate and the remote control panel 90 And the remote control panel 90 receiving the signal of the flow rate analyzer compares the flow rates before and after the electrolyte supply pump 61, and also compares the flow rates before and after the washing solution supply pump 71 and shows a difference in flow rates. In this case, the power supply is cut off to prevent leakage of cleaning solution and electrolyte solution.

The present invention prevents the difficulty of work occurring during electrolytic polishing manually in a narrow space by the operator and prevents safety accidents due to electrolyte or radiation, and evenly and quickly performs electropolishing even in the corners or round channel head surfaces. By monitoring the situation through the monitor, the internal surface of the channel head can be polished uniformly in a short time.

Claims (10)

Inserted into the manway 12 or the cooling water passage 14 of the channel head 10, the menu plate 20 is free to move, and is coupled to be rotated to the end of the menu plate 20, the electrode 31, the electrolyte nozzle (36), the head 30 consisting of a washing liquid nozzle 38 and the distance recognition sensor 40, and the electrolyte supply device 60 connected to the electrolyte nozzle 36 and the washing liquid nozzle 38 of the head 30 by a pipeline And an electrolyte treatment apparatus 80 for sucking the washing liquid and the electrolyte on the inner surface of the channel head 10 by the recovery pipe 83 inserted into the manway 12 or the cooling water passage 14. , + Pole is in contact with the channel head 10,-pole is in contact with the electrode, the power supply 100 connected to the menu plate 20, the electrolyte supply device 60, the cleaning solution supply device 70, the electrolyte treatment device 80 and Steam steam, characterized in that consisting of a remote controller 90 is connected to the power source 100 and controls the operation of the power source 100, the menu plate 20, the head 36 Electrolytic polishing apparatus of the group channel head. The method of claim 1, The head 30 is electrolytic polishing device for the steam generator channel head, characterized in that the monitoring camera 50 is formed to monitor the electrolytic polishing state to transmit to the remote controller (90). The method of claim 1, Electrolytic polishing apparatus of the steam generator channel head, characterized in that the electrolyte flow passage (35) in communication with the electrolyte supply pipe (64) is formed inside the electrode (31) and the front surface is formed with a nozzle (33) for injecting the electrolyte. The method of claim 1, Electrode polishing apparatus of the steam generator channel head, characterized in that the electrode 31 is coupled to the guideway rack 41 to move before and after. The method of claim 1, Electrolytic polishing apparatus of the steam generator channel head, characterized in that the electrode is stacked with an insulator (32). The electrolytic polishing apparatus for a steam generator channel head according to any one of claims 1, 3, and 5, wherein the electrode is made of a copper material of φ8 × 200 mm. The method of claim 1, The electrolyte supply device 60 includes an electrolyte supply pipe 64 connected to an electrolyte nozzle 36, a pump 61 serving as a driving source for supplying an electrolyte, between the electrolyte storage tank 62 and the pump 61, and a pump 61. Steam generator channel head, characterized in that formed in the electrolyte supply pipe 64 between the electrolyte nozzle 36 and the flow sensor 63-1, 63-2 for transmitting a flow signal to the remote controller 90 Electrolytic polishing device. The method of claim 1, The washing liquid supply device 70 includes a washing liquid supply pipe 74 connected to the washing liquid nozzle 38, a pump 71 serving as a driving source for supplying the washing liquid, a washing liquid storage tank 72 to which the washing liquid is supplied, and the washing liquid storage tank 72. Flow sensor 73-1 (73-) formed between the pump 71 and between the pump 71 and the washing liquid nozzle 38 to transmit a flow signal to the remote controller 90. Electrolytic polishing apparatus of the steam generator channel head, characterized in that consisting of 2). The method of claim 1, The electrolyte treatment apparatus 80 includes a recovery pipe 83 connected to an inner bottom portion of the channel head 10 through a cooling water passage 14 or a manway 12 of the channel head 10, and an end of the recovery pipe 83. Electrolytic polishing apparatus of the steam generator channel head, characterized in that consisting of a storage tank (72) formed in the suction pipe (81) formed on the recovery pipe (83) to give a suction force. The method of claim 9, Electrolytic polishing apparatus of the steam generator channel head, characterized in that the funnel (84) for collecting the electrolyte and the washing liquid is formed at the end of the recovery pipe (83).