CN221803291U - Leakage detection device for tubular heat exchanger of hydropower station - Google Patents

Abstract

The utility model provides a hydropower station shell and tube heat exchanger leak detection device, which comprises an upper leak detection pressure measurement end cover matched with an upper cover plate of a heat exchanger body, wherein upper flange holes are uniformly distributed and processed on the periphery of the upper leak detection pressure measurement end cover, an upper pressure measurement hole matched with an upper pipe orifice of a heat exchange pipe is processed in the middle part of the upper leak detection pressure measurement end cover, and an upper pressure measurement joint is arranged at the position where the upper pressure measurement hole is positioned; the heat exchanger comprises a heat exchanger body, and is characterized by further comprising a lower leakage detecting and pressure measuring end cover matched with a lower cover plate of the heat exchanger body, wherein lower flange holes are uniformly distributed on the periphery of the lower leakage detecting and pressure measuring end cover, lower pressure measuring holes matched with lower pipe orifices of the heat exchange pipes are formed in the middle of the lower leakage detecting and pressure measuring end cover, and lower pressure measuring joints are arranged at the positions where the lower pressure measuring holes are located. The device can realize the leakage detection of the heat exchanger which is operated normally, and can accurately position the detected leakage point.

Description

A leak detection device for shell-and-tube heat exchanger in hydropower station

Technical Field

The utility model relates to the technical field of heat exchangers in hydropower stations, in particular to a leak detection device for shell-and-tube heat exchangers in hydropower stations.

Background Art

In the prior art, heat exchangers are basically pressed as a whole and cannot be precisely positioned. Therefore, if the heat exchanger leaks or the two media are mixed together, the entire heat exchanger needs to be replaced, resulting in high costs. If the heat exchanger body is large and heavy, the installation space inside the equipment is generally narrow and difficult to move, which makes it difficult to carry and requires multiple workers, which is time-consuming and labor-intensive. Therefore, the production cost of heat exchanger maintenance and replacement is increased, which restricts production efficiency.

If the leak occurs in the heat exchanger, the leak position that needs to be repaired can be quickly located and detected, and then the leak position can be located and repaired instead of the traditional overall replacement and maintenance. This will greatly improve the maintenance efficiency and effectively reduce the maintenance cost.

Although CN108266925B discloses a heat exchanger, including a plurality of heat exchange tubes placed transversely, a manifold, a refrigerant inlet and a refrigerant outlet, the plurality of heat exchange tubes are arranged longitudinally, the two ends of each heat exchange tube are respectively connected to the manifold, the refrigerant inlet and the refrigerant outlet are arranged on the manifold, a plurality of partitions are arranged in the manifold, the partitions divide the manifold into a plurality of manifold chambers arranged along the length direction of the manifold, at least one manifold chamber is provided with a gas-liquid separation device, the gas-liquid separation device includes a partition plate, a gas channel and a liquid channel, the partition plate divides the manifold chamber into a mixing chamber and a gas chamber, the gas channel connects the mixing chamber and the gas chamber, and the inlet of the gas channel is higher than the bottom of the mixing chamber by a predetermined distance. However, this heat exchanger will inevitably have leakage problems during specific use, and it is also impossible to quickly locate the leakage site when leakage occurs.

Although, CN107063590A discloses a pressure test device and a pressure test method for a plate heat exchanger, the pressure test device includes a plate seat for installation on the plate heat exchanger, a water inlet for filling water into the plate heat exchanger, an exhaust port for exhausting the plate heat exchanger, and a pressure gauge for detecting the internal pressure of the plate heat exchanger; the water inlet, the exhaust port and the pressure gauge are all arranged on the plate seat. The utility model is used to detect the sealing performance of the plate heat exchanger; after the plate heat exchanger of the nuclear power plant is dismantled and overhauled, the heat exchanger is pressurized according to the system working pressure to verify the sealing performance of the heat exchanger after the overhaul, and to ensure the long-term reliable operation of the heat exchanger. However, this method can only be applied to the sealing performance inspection of the heat exchanger before it leaves the factory, and cannot well adapt to the problem of leakage during its normal operation.

Utility Model Content

The utility model aims to provide a leak detection device for a shell-and-tube heat exchanger in a hydropower station, which can detect the leakage of a heat exchanger that is already operating normally, and can accurately locate the detected leakage point, providing an accurate basis for implementing accurate plugging. The specific implementation process saves time and effort, and improves the maintenance efficiency of the heat exchanger; it avoids the difficulties of traditional overall transportation, reduces the production cost of heat exchanger maintenance, and improves production efficiency.

In order to realize the above technical features, the purpose of the utility model is achieved as follows: a leak detection device for a shell-and-tube heat exchanger in a hydropower station, comprising an upper leak detection and pressure measuring end cover for matching with an upper cover plate of a heat exchanger body, upper flange holes are evenly processed on the periphery of the upper leak detection and pressure measuring end cover, an upper pressure measuring hole for matching with an upper pipe opening of a heat exchange tube is processed in the middle part of the upper leak detection and pressure measuring end cover, and an upper pressure measuring joint is installed at the position where the upper pressure measuring hole is located;

It also includes a lower leak detection and pressure measuring end cover for cooperating with the lower cover plate of the heat exchanger body, the outer periphery of the lower leak detection and pressure measuring end cover is evenly processed with lower flange holes, the middle part of the lower leak detection and pressure measuring end cover is processed with a lower pressure measuring hole for cooperating with the lower pipe mouth of the heat exchange tube, and a lower pressure measuring joint is installed at the position where the lower pressure measuring hole is located.

The upper flange hole matches with the upper heat exchanger flange hole on the periphery of the upper cover plate and is fixedly connected by flange bolts.

The lower flange hole matches with the lower heat exchanger flange hole on the periphery of the lower cover plate and is fixedly connected by flange bolts.

One end of the upper pressure measuring joint is inserted into the interior of the upper pipe opening of the heat exchange tube to achieve sealing; the other end of the upper pressure measuring joint is provided with an upper external threaded column.

One end of the lower pressure measuring joint is inserted into the lower pipe opening of the heat exchange tube to achieve sealing; the other end of the lower pressure measuring joint is provided with a lower external threaded column.

When checking for leaks, a pressure gauge is fixedly installed on the upper external threaded column.

When checking for leaks, the lower external threaded column is connected to a pressure pump through a connecting pipe and a valve.

The upper pipe opening of the heat exchange pipe and the lower pipe opening of the heat exchange pipe are connected through the heat exchange pipe.

A method for detecting heat exchanger leaks using a shell-and-tube heat exchanger leak detection device for a hydropower station comprises the following steps:

Step 1: Fix and install the upper leak detection and pressure measuring end cover:

The upper leak detection and pressure measuring end cover is fixedly connected to the upper cover plate of the heat exchanger body through flange bolts, and the upper pressure measuring joint is inserted into the interior of the upper pipe opening of the heat exchange tube, and the upper pipe opening of the heat exchange tube is sealed;

Step 2: Fix and install the lower leak detection and pressure measurement end cover:

The lower leak detection and pressure measuring end cover is fixedly connected to the lower cover plate of the heat exchanger body through flange bolts, and the lower pressure measuring joint is inserted into the upper pipe opening of the heat exchange tube, and the lower pipe opening of the heat exchange tube is sealed;

Step 3: Installation of pressure gauge:

Install the pressure gauge seals on all upper pressure test joints;

Step 4: Connection of the pressure pump:

Install valves on each hole of the lower pressure measuring joint and connect it to the pressure pump;

Step 5: Pressure maintenance test:

Finally, add the leak detection medium to reach the test pressure and maintain the pressure. If the pressure drops beyond the specified value, it can be determined that the corresponding heat exchange tube is leaking. After sealing both ends of the leaking heat exchange tube, remove the upper leak detection and pressure measuring end cover and the lower leak detection and pressure measuring end cover, and then reinstall a new heat exchange tube to resume use.

The utility model has the following beneficial effects:

1. The utility model can detect the leakage point and locate it at a precise point, providing an accurate basis for precise plugging, saving time and effort, and improving the efficiency of heat exchanger maintenance; avoiding difficulties in transportation, reducing the production cost of heat exchanger maintenance, and improving production efficiency.

2. By adopting the above-mentioned flange connection, a reliable connection between the upper leak detection and pressure measuring end cover and the upper cover plate can be achieved.

3. By adopting the above-mentioned flange connection, a reliable connection between the lower leak detection and pressure measuring end cover and the lower cover plate can be achieved.

4. The upper pressure measuring joint mentioned above facilitates the connection of the pressure gauge during the side pressure process.

5. The lower pressure measuring joint mentioned above facilitates the connection of the pressure pump during the side pressure process.

BRIEF DESCRIPTION OF THE DRAWINGS

The utility model is further described below in conjunction with the accompanying drawings and embodiments.

FIG1 is a structural diagram of a heat exchanger of the present utility model.

FIG. 2 is a top view of the upper leak detection and pressure measuring end cover of the present utility model.

FIG3 is a main cross-sectional view of the upper leak detection and pressure measuring end cover of the present utility model.

FIG. 4 is a top view of the upper leak detection and pressure measuring end cover of the present invention.

FIG5 is a main cross-sectional view of the upper leak detection and pressure measuring end cover of the present invention.

In the figure: lower cover plate 1, lower heat exchanger flange hole 2, heat exchange tube 3, lower tube opening of heat exchange tube 4, heat exchanger body 5, upper cover plate 6, upper heat exchanger flange hole 7, upper tube opening of heat exchange tube 8, upper leak detection and pressure measuring end cover 9, upper flange hole 10, upper pressure measuring hole 11, upper pressure measuring joint 12, upper external threaded column 13, lower leak detection and pressure measuring end cover 14, lower pressure measuring hole 15, lower flange hole 16, lower pressure measuring joint 17, lower external threaded column 18.

DETAILED DESCRIPTION

The implementation modes of the present utility model are further described below in conjunction with the accompanying drawings.

Embodiment 1:

As shown in Figures 1-5, a leak detection device for a shell-and-tube heat exchanger in a hydropower station includes an upper leak detection and pressure measuring end cover 9 for matching with the upper cover plate 6 of the heat exchanger body 5, the outer periphery of the upper leak detection and pressure measuring end cover 9 is evenly processed with upper flange holes 10, the middle part of the upper leak detection and pressure measuring end cover 9 is processed with upper pressure measuring holes 11 for matching with the upper pipe mouth 8 of the heat exchange tube, and the upper pressure measuring joint 12 is installed at the position where the upper pressure measuring hole 11 is located; it also includes a lower leak detection and pressure measuring end cover 14 for matching with the lower cover plate 1 of the heat exchanger body 5, the outer periphery of the lower leak detection and pressure measuring end cover 14 is evenly processed with lower flange holes 16, the middle part of the lower leak detection and pressure measuring end cover 14 is processed with lower pressure measuring holes 15 for matching with the lower pipe mouth 4 of the heat exchange tube, and the lower pressure measuring joint 17 is installed at the position where the lower pressure measuring holes 15 are located. This device can detect leaks in heat exchangers that are already operating normally, and can accurately locate the detected leaks, providing an accurate basis for precise plugging. The specific implementation process saves time and effort, and improves the efficiency of heat exchanger maintenance; it avoids the difficulties of traditional overall transportation, reduces the production cost of heat exchanger maintenance, and improves production efficiency.

Furthermore, the upper flange hole 10 matches with the upper heat exchanger flange hole 7 on the periphery of the upper cover plate 6 and is fixedly connected by flange bolts. By adopting the above flange connection, the upper leak detection and pressure measurement end cover 9 can be reliably connected to the upper cover plate 6.

Furthermore, the lower flange hole 16 matches with the lower heat exchanger flange hole 2 on the outer periphery of the lower cover plate 1 and is fixedly connected by flange bolts. By adopting the above flange connection, the lower leak detection and pressure measurement end cover 14 can be reliably connected to the lower cover plate 1.

Furthermore, one end of the upper pressure measuring joint 12 is inserted into the interior of the upper pipe opening 8 of the heat exchange tube and sealed; the other end of the upper pressure measuring joint 12 is provided with an upper external threaded column 13. The upper pressure measuring joint 12 facilitates the connection of a pressure gauge during the side pressure process.

Furthermore, one end of the lower pressure measuring joint 17 is inserted into the lower pipe opening 4 of the heat exchange tube and sealed; the other end of the lower pressure measuring joint 17 is provided with a lower external threaded column 18. The lower pressure measuring joint 17 facilitates the connection of the pressure pump during the side pressure process.

Furthermore, during leak detection, a pressure gauge is fixedly mounted on the upper external threaded column 13. The pressure gauge is used to monitor the pressure during the detection process.

Furthermore, during leak detection, the lower external threaded column 18 is connected to a pressure pump through a connecting pipe and a valve. The pressure pump is used to supply pressure during the detection process.

Furthermore, the upper pipe opening 8 of the heat exchange tube and the lower pipe opening 4 of the heat exchange tube are connected through the heat exchange tube 3 .

Embodiment 2:

A method for detecting heat exchanger leaks using a shell-and-tube heat exchanger leak detection device for a hydropower station comprises the following steps:

Step 1: Fixing and installing the upper leak detection and pressure measuring end cover 9:

The upper leak detection and pressure measuring end cover 9 is fixedly connected to the upper cover plate 6 of the heat exchanger body 5 through flange bolts, and the upper pressure measuring joint 12 is inserted into the interior of the upper pipe opening 8 of the heat exchange tube, and the upper pipe opening 8 of the heat exchange tube is sealed;

Step 2: Fixing and installing the lower leak detection and pressure measurement end cover 14:

The lower leak detection and pressure measuring end cover 14 is fixedly connected to the lower cover plate 1 of the heat exchanger body 5 through flange bolts, and the lower pressure measuring joint 17 is ensured to be inserted into the upper pipe opening 8 of the heat exchange tube, and the lower pipe opening 4 of the heat exchange tube is sealed;

Step 3: Installation of pressure gauge:

Install the pressure gauge seal on all upper pressure measuring joints 12;

Step 4: Connection of the pressure pump:

After installing valves on each hole of the lower pressure measuring joint 17, connect it to the pressure pump;

Step 5: Pressure maintenance test:

Finally, add the leak detection medium to reach the test pressure and maintain the pressure. If the pressure drops beyond the specified value, it can be determined that the corresponding heat exchange tube 3 is leaking. After sealing the two ends of the leaking heat exchange tube 3, remove the upper leak detection and pressure measuring end cover 9 and the lower leak detection and pressure measuring end cover 14, and then reinstall a new heat exchange tube to resume use.

Claims (8)

1. A leak detection device for a shell-and-tube heat exchanger of a hydropower station, characterized in that it comprises an upper leak detection and pressure measuring end cover (9) for matching with an upper cover plate (6) of a heat exchanger body (5), upper flange holes (10) are evenly distributed on the periphery of the upper leak detection and pressure measuring end cover (9), an upper pressure measuring hole (11) for matching with an upper pipe opening (8) of a heat exchange tube is processed in the middle of the upper leak detection and pressure measuring end cover (9), and an upper pressure measuring joint (12) is installed at the location of the upper pressure measuring hole (11); It also includes a lower leak detection and pressure measuring end cover (14) for matching with the lower cover plate (1) of the heat exchanger body (5); the outer periphery of the lower leak detection and pressure measuring end cover (14) is uniformly processed with lower flange holes (16); the middle portion of the lower leak detection and pressure measuring end cover (14) is processed with a lower pressure measuring hole (15) for matching with the lower pipe opening (4) of the heat exchange tube; and a lower pressure measuring joint (17) is installed at the location of the lower pressure measuring hole (15). 2. A leak detection device for a shell-and-tube heat exchanger in a hydropower station according to claim 1, characterized in that: the upper flange hole (10) matches with the upper heat exchanger flange hole (7) on the periphery of the upper cover plate (6), and is fixedly connected by flange bolts. 3. A leak detection device for a shell-and-tube heat exchanger in a hydropower station according to claim 1, characterized in that: the lower flange hole (16) matches with the lower heat exchanger flange hole (2) on the periphery of the lower cover plate (1), and is fixedly connected by flange bolts. 4. A leak detection device for a shell-and-tube heat exchanger in a hydropower station according to claim 1, characterized in that: one end of the upper pressure measuring joint (12) is inserted into the interior of the upper pipe opening (8) of the heat exchange tube to achieve sealing; and the other end of the upper pressure measuring joint (12) is provided with an upper external threaded column (13). 5. A leak detection device for a shell-and-tube heat exchanger in a hydropower station according to claim 1, characterized in that: one end of the lower pressure measuring joint (17) is inserted into the interior of the lower pipe opening (4) of the heat exchange tube to achieve sealing; and the other end of the lower pressure measuring joint (17) is provided with a lower external threaded column (18). 6. A leak detection device for a shell-and-tube heat exchanger in a hydropower station according to claim 4, characterized in that: during leak detection, a pressure gauge is fixedly mounted on the upper external threaded column (13). 7. A leak detection device for a shell-and-tube heat exchanger in a hydropower station according to claim 5, characterized in that during leak detection, the lower external threaded column (18) is connected to a pressure pump via a connecting pipe and a valve. 8. A leak detection device for a shell-and-tube heat exchanger in a hydropower station according to claim 1, characterized in that the upper pipe opening (8) of the heat exchange tube and the lower pipe opening (4) of the heat exchange tube are connected via the heat exchange tube (3).