Flushing and drying device and flushing method for leakage monitoring pipeline of horizontal steam generator

Abstract

The invention relates to the field of nuclear power equipment, in particular to a flushing and drying device for a leakage monitoring pipeline of a horizontal steam generator and a flushing method. The device is characterized in that a main pipeline is respectively provided with a positioning and pressing device and a main control valve; the air supply branch and the water supply branch are respectively connected to a main pipeline, and the air inlet amount and the water inlet amount of the positioning and pressing device are controlled by a main control valve; according to the positioning and pressing device, a positioning plate is connected with a positioning bolt through a first bolt; the upper pressing block is connected with the lower pressing block, the middle hole channel penetrates through the upper pressing block and the lower pressing block, the connector penetrates through the positioning plate, one end of the connector is connected with the upper pressing block, and the other end of the connector is connected with the hose. The connector is hollow and is in butt joint with the middle hole channel. The upper pressing block is connected to the positioning plate through a fastener; the hose is connected to a main line. By means of the device, cleaning of the leakage detection pipe can be achieved. The device is safe and reliable, and the flushing effect and efficiency are effectively improved.

Description

Technical Field

[0001] The invention relates to the field of nuclear power equipment, and in particular to a flushing and drying device and a flushing method for a leakage monitoring pipeline of a horizontal steam generator. Background Art

[0002] The steam generator is one of the important equipment in a nuclear power plant. Its function is to transfer the heat of the primary circuit coolant to the secondary circuit feed water so that it is heated into steam.

[0003] The horizontal steam generator adopts an inner and outer graphite gasket sealing structure. In order to monitor the sealing of the flange joint surface, a leakage monitoring tube for the primary side flange sealing is set inside each manifold. The leakage monitoring tube is arranged along the inner surface of the manifold, passes through the wall of the manifold, and finally leads to the outside of the steam generator shell. If there is a lot of residual chlorine in the leakage monitoring tube of the steam generator, the chlorine in the leakage monitoring tube will drift and diffuse to the space between the inner and outer sealing gaskets during operation. After the high-temperature and high-pressure medium on the secondary side leaks between the inner sealing gasket and the top cover, the droplets in it vaporize due to the pressure drop, and there is only a wet area near the inner sealing gasket. At the same time, due to the presence of chlorine, the chloride ions in the wet area are concentrated, forming a local corrosion environment, which leads to pitting corrosion. In order to avoid pitting damage to the sealing surface by chlorine, the leakage monitoring tube needs to be flushed.

[0004] Since the diameter of the leak monitoring pipe is small, if flushing with running water is used, the flushing water is easy to overflow, which will cause the spread of radioactive contamination. At the same time, there is a risk that foreign matter will enter the steam generator with the flushing water, causing immeasurable losses. The flushing pressure of running water is insufficient, the flushing effect is poor, and repeated flushing will affect the overhaul period and cause waste of manpower and material resources. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a flushing and drying device and a flushing method for a leakage monitoring pipeline of a horizontal steam generator, so as to effectively improve the flushing effect and efficiency.

[0006] The present invention provides a horizontal steam generator leakage monitoring pipeline flushing and drying device, comprising: a positioning and pressing device and a main control valve are respectively arranged on the main pipeline;

[0007] The air supply branch and the water supply branch are respectively connected to the main pipeline, and the air intake and water intake of the positioning and pressing device are controlled by the main control valve;

[0008] The positioning and clamping device comprises: a positioning plate, a positioning bolt, a joint, an upper clamping block, a lower clamping block, a hose, and a fastener;

[0009] The positioning plate is connected to the positioning bolt via a first bolt;

[0010] The upper pressing block is connected to the lower pressing block, and the middle channel runs through the upper pressing block and the lower pressing block.

[0011] The connector passes through the positioning plate, one end of which is connected to the upper pressing block, and the other end of which is connected to the hose;

[0012] The joint is hollow inside and butts with the middle channel;

[0013] The upper pressing block is connected to the positioning plate via a fastener;

[0014] The hose is connected to the main line.

[0015] Furthermore, an air compressor and an air control valve are provided on the air supply branch line, and a water pump and a water supply control valve are provided on the water supply branch line.

[0016] Furthermore, an elliptical hole is provided on the positioning plate, and the first bolt passes through the elliptical hole to fix the positioning plate on the positioning bolt.

[0017] Furthermore, a first gasket is provided between the first bolt and the positioning plate.

[0018] Furthermore, the connector has a thread at one end, which is threadedly connected to the upper clamping block; and a tower-type interface at the other end, which is connected to the hose.

[0019] Further, the fastener includes a second bolt, a nut and a second gasket;

[0020] The second bolt passes through the positioning plate and is pressed into the positioning groove on the upper surface of the upper pressing block;

[0021] The nut fastens the second bolt to the positioning plate.

[0022] A second gasket is arranged between the second bolt and the positioning plate.

[0023] Furthermore, the fasteners are provided in 3 to 12 sets.

[0024] Furthermore, the second bolts in the plurality of fasteners are arranged at an angle of 30° to 120° to each other.

[0025] The present invention provides a horizontal steam generator leakage monitoring pipeline flushing method, comprising the following steps:

[0026] Install the positioning bolts in the bolt holes near the leakage monitoring holes for positioning;

[0027] The positioning and clamping device is installed on the leakage detection hole, the middle channel thereof is aligned with the leakage monitoring hole, and the upper clamping block and the lower clamping block are clamped;

[0028] The main control valve controls the input of liquid into the leakage detection hole for liquid flushing;

[0029] After flushing for a period of time, gas is supplied simultaneously to perform gas-liquid mixed flushing;

[0030] Finally, stop the liquid input and purge gas into the leak detection hole until it is dry.

[0031] Further, a locating pin is used to align the middle channel with the leak detection hole.

[0032] Compared with the prior art, the horizontal steam generator leakage monitoring pipeline flushing and drying device and flushing method of the present invention have the following beneficial effects:

[0033] (1) This device can control gas, liquid, and gas-liquid mixture for flushing and purging, effectively improving the flushing effect and efficiency;

[0034] (2) The device can effectively seal the flushing pipeline to prevent the overflow of flushing water and the spread of radioactive contamination;

[0035] (3) This device can play the role of leak monitoring and foreign matter prevention during flushing, preventing foreign matter from entering the steam generator with flushing water;

[0036] (4) This device can directly carry out subsequent purging and drying work after the flushing is completed, and it can serve two purposes in one machine;

[0037] (5) This device can effectively reduce the maintenance period of flushing and drying the leakage monitoring pipe, and a single overhaul is shortened from 120 hours to 8 hours;

[0038] (6) This device is suitable for leakage monitoring pipelines of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram showing the structure of a flushing and drying device for a leak monitoring pipeline of a horizontal steam generator;

[0040] Figure 2 A three-dimensional schematic diagram showing a positioning and clamping device;

[0041] Figure 3 A top view showing the positioning and clamping device;

[0042] Figure 4 A front view showing the positioning and clamping device;

[0043] Figure 5 A left side view showing the positioning and clamping device;

[0044] In the figure,

[0045] 1-air compressor, 2-air control valve, 3-main control valve, 4-positioning and clamping device, 5-water supply control valve, 6-water pump, 401-positioning bolt, 402-positioning plate, 403-first gasket, 404-first bolt, 405-second gasket, 406-second bolt, 407-nut, 408-connector, 409-upper clamping block, 410-lower clamping block, 411 screw, 412-hose. DETAILED DESCRIPTION

[0046] In order to further understand the present invention, the embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.

[0047] The embodiment of the present invention discloses a horizontal steam generator leakage monitoring pipeline flushing and drying device, such as Figure 1 As shown, it includes: a positioning and clamping device 4 and a main control valve 3 are respectively arranged on the main pipeline;

[0048] The air supply branch and the water supply branch are respectively connected to the main pipeline, and the air intake and water intake of the positioning and pressing device 4 are controlled by the main control valve 3;

[0049] An air compressor 1 and an air control valve 2 are arranged on the air supply branch. The air control valve 2 controls the switch and flow of the air source. The air control valve 2 may be a ball valve.

[0050] A water pump 6 and a water supply control valve 5 are arranged on the water supply branch line, and the water supply control valve 5 controls the switch and flow of the water source.

[0051] like Figures 2 to 5 As shown, the positioning and clamping device 4 includes: a positioning plate 402, a positioning bolt 401, a joint 408, an upper clamping block 409, a lower clamping block 410, a hose 412, and a fastener;

[0052] The positioning plate 402 is connected to the positioning bolt 401 through a first bolt 404;

[0053] The positioning plate 402 is provided with an elliptical hole, and the first bolt 404 passes through the elliptical hole to fix the positioning plate 402 on the positioning bolt 401. The elliptical hole can adjust the relative position of the positioning bolt 401 and the positioning plate 402.

[0054] A first gasket 403 is disposed between the first bolt 404 and the positioning plate 402 .

[0055] The upper pressing block 409 is connected to the lower pressing block 410, and the middle channel runs through the upper pressing block 409 and the lower pressing block 410.

[0056] The upper pressing block 409 is made of stainless steel 316L, and the lower pressing block 410 is made of nylon. The upper pressing block 409 and the lower pressing block 410 are connected by screws 411 .

[0057] The connector 408 passes through the positioning plate 402, one end of which is connected to the upper pressing block 409, and the other end of which is connected to the hose 412;

[0058] The connector 408 has a thread at one end, which is threadedly connected to the upper clamping block 409 ; and a tower-type interface at the other end, which is connected to the hose 412 .

[0059] The connector 408 is hollow inside and butts with the middle channel;

[0060] The upper pressing block 409 is connected to the positioning plate 402 via fasteners;

[0061] The fastener includes a second bolt 406, a nut 407 and a second gasket 405;

[0062] The second bolt 406 passes through the positioning plate 402 and is pressed into the positioning groove on the upper surface of the upper pressing block 409;

[0063] The nut 407 fastens the second bolt 406 to the positioning plate 402.

[0064] A second gasket 405 is disposed between the second bolt 406 and the positioning plate 402 .

[0065] The fasteners are provided in 3 to 12 sets. The second bolts in a plurality of the fasteners are arranged at an angle of 30° to 120° to each other.

[0066] When there are three sets of fasteners, the fasteners of the gasket 405 , the bolt 406 , and the nut 407 are pressed onto the three positioning grooves on the upper surface of the upper clamping block 409 through three holes on the positioning plate 402 that are 120 degrees apart from each other.

[0067] The hose 412 is connected to the main pipeline.

[0068] The embodiment of the present invention discloses a method for flushing a horizontal steam generator leakage monitoring pipeline using the device described in the above technical solution, comprising the following steps:

[0069] Install the positioning bolts in the bolt holes near the leakage monitoring holes for positioning;

[0070] The positioning and clamping device is installed on the leakage detection hole, the middle channel thereof is aligned with the leakage monitoring hole, and the upper clamping block and the lower clamping block are clamped;

[0071] The main control valve controls the input of liquid into the leakage detection hole for liquid flushing;

[0072] After flushing for a period of time, gas is supplied simultaneously to perform gas-liquid mixed flushing;

[0073] Finally, stop the liquid input and purge gas into the leak detection hole until it is dry.

[0074] Preferably, a locating pin is used to align the intermediate channel with the leak detection hole.

[0075] Specifically, the operation process of using this device to flush and purge the leak monitoring pipe is as follows:

[0076] 1. Install the positioning bolt 401 in the bolt hole near the leakage monitoring pipe hole;

[0077] 2. Use the first gasket 403 and the first bolt 404 to connect and fix the positioning bolt 401 and the positioning plate 402;

[0078] 3. Use screws 411 to connect the upper pressing block 409 and the lower pressing block 410;

[0079] 4. Use the positioning pin to align the middle hole of the clamping block with the hole of the leakage monitoring pipe;

[0080] 5. Remove the positioning pin and install the connector 408 on the middle threaded hole of the upper clamping block 409;

[0081] 7. Install the gasket 405, bolt 406, nut 407, and properly adjust the relative positions of the positioning bolt 401 and the positioning plate 402, so that the second bolt 406 is aligned with the positioning groove on the upper surface of the upper clamping block 409, and tighten the second bolt 406, so that the lower clamping block 410 is in close contact with the flange surface of the steam generator header and sealed;

[0082] 8. Install hose 412 on the tower interface of connector 408;

[0083] 9. Press Figure 1 Connect the remaining parts;

[0084] 10. Open the water supply control valve 5 and the main control valve 3, close the air valve 2, and perform liquid flushing;

[0085] 11. Open the air control valve 2, main control valve 3 and water supply control valve 5 to perform gas-liquid mixed flushing;

[0086] 12. Open the air control valve 2 and the main control valve 3, close the water supply control valve 5, and blow and dry.

[0087] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0088] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A horizontal steam generator leakage monitoring pipeline flushing and drying device, characterized in that: include: Positioning and clamping devices and main control valves are respectively provided on the main pipeline; The air supply branch and the water supply branch are respectively connected to the main pipeline, and the air intake and water intake of the positioning and pressing device are controlled by the main control valve; The positioning and clamping device comprises: a positioning plate, a positioning bolt, a joint, an upper clamping block, a lower clamping block, a hose, and a fastener; The positioning plate is connected to the positioning bolt via a first bolt; The upper pressing block is connected to the lower pressing block, and the middle channel runs through the upper pressing block and the lower pressing block. The connector passes through the positioning plate, one end of which is connected to the upper pressing block, and the other end of which is connected to the hose; The joint is hollow inside and butts with the middle channel; The upper pressing block is connected to the positioning plate via a fastener; The hose is connected to the main line.

2. The horizontal steam generator leakage monitoring pipeline flushing and drying device according to claim 1 is characterized in that: An air compressor and an air control valve are arranged on the air supply branch line, and a water pump and a water supply control valve are arranged on the water supply branch line.

3. The horizontal steam generator leakage monitoring pipeline flushing and drying device according to claim 1 is characterized in that: The positioning plate is provided with an elliptical hole, and the first bolt passes through the elliptical hole to fix the positioning plate on the positioning bolt.

4. The horizontal steam generator leakage monitoring pipeline flushing and drying device according to claim 3 is characterized in that: A first gasket is provided between the first bolt and the positioning plate.

5. The horizontal steam generator leakage monitoring pipeline flushing and drying device according to claim 1, characterized in that: The joint has a thread at one end, which is threadedly connected to the upper clamping block; and a tower-type interface at the other end, which is connected to the hose.

6. The horizontal steam generator leakage monitoring pipeline flushing and drying device according to claim 1, characterized in that: The fastener includes a second bolt, a nut and a second gasket; The second bolt passes through the positioning plate and is pressed into the positioning groove on the upper surface of the upper pressing block; The nut fastens the second bolt to the positioning plate. A second gasket is arranged between the second bolt and the positioning plate.

7. The horizontal steam generator leakage monitoring pipeline flushing and drying device according to claim 6, characterized in that: The fasteners are provided in 3 to 12 sets.

8. The horizontal steam generator leakage monitoring pipeline flushing and drying device according to claim 7, characterized in that: The second bolts in the plurality of fasteners are arranged at an angle of 30° to 120° to each other.

9. A method for flushing a horizontal steam generator leakage monitoring pipeline, characterized in that: The following steps are involved: Install the positioning bolts in the bolt holes near the leakage monitoring holes for positioning; The positioning and clamping device is installed on the leakage detection hole, the middle channel thereof is aligned with the leakage monitoring hole, and the upper clamping block and the lower clamping block are clamped; The main control valve controls the input of liquid into the leakage detection hole for liquid flushing; After flushing for a period of time, gas is supplied simultaneously to perform gas-liquid mixed flushing; Finally, stop the liquid input and purge gas into the leak detection hole until it is dry.

10. The method for flushing a horizontal steam generator leakage monitoring pipeline according to claim 9, characterized in that: Use the dowel pins to align the center channel with the leak detection hole.

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