A testing device and method for graphite heat exchangers

Abstract

The application provides a testing device and method for a graphite heat exchanger, and relates to the technical field of testing devices.The testing device comprises a graphite heat exchanger, the graphite heat exchanger comprises a tank body, sealing plates and heat exchange pipes, the number of the sealing plates is two, the two sealing plates are fixedly installed in the tank body, and the tank body and the two sealing plates combine to form a sealed heat exchange chamber, and the number of the heat exchange pipes is multiple, and the multiple heat exchange pipes sequentially penetrate through the two sealing plates.The testing device and method for the graphite heat exchanger can simultaneously test multiple mutually independent spaces in the graphite heat exchanger, can perform mutual verification and comparison tests, can quickly determine the position of a leak and the internal leakage condition, and is simple and convenient to operate and high in testing work efficiency.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and in particular to a testing device and method for graphite heat exchangers. Background Technology

[0002] A graphite heat exchanger is a heat exchange device that uses graphite as the heat transfer element. Due to graphite's excellent thermal conductivity, good corrosion resistance, and high-temperature stability, it has been widely used in chemical, petroleum, and pharmaceutical industries. Its working principle is that two media at different temperatures flow in a graphite block or pipe, and the heat is transferred from the high-temperature medium to the low-temperature medium through the conduction of the graphite material.

[0003] Before leaving the factory and after long-term use, graphite heat exchangers usually need to undergo sealing performance tests to ensure their safe operation and heat exchange efficiency. These tests typically involve sealing the outlets of each independent space within the graphite heat exchanger and then introducing fluid through the inlet to pressurize it. However, since a graphite heat exchanger contains at least two independent spaces, fluid needs to be injected into each of these spaces separately for the sealing performance test, making the process cumbersome. Summary of the Invention

[0004] Based on the technical problems existing in the background art, the present invention proposes a testing device and method for graphite heat exchangers.

[0005] The present invention proposes a testing device and method for a graphite heat exchanger, comprising a graphite heat exchanger, the graphite heat exchanger including a tank body, sealing plates and heat exchange tubes, the number of sealing plates being two, both of the sealing plates being fixedly installed in the tank body, and the tank body and the two sealing plates being combined to form a sealed heat exchange chamber, the number of heat exchange tubes being multiple, the multiple heat exchange tubes being sequentially inserted through the two sealing plates, and the openings at both ends of the heat exchange tubes being located outside the heat exchange chamber;

[0006] It also includes a base plate, on which two mounting brackets are fixedly installed. The graphite heat exchanger is placed on the two mounting brackets. One end of the heat exchange tube is detachably connected to a pressure measuring tube. A pressure sensor is installed at the end of the pressure measuring tube. A connecting box is fixedly installed on the base plate. A connecting cavity is opened inside the connecting box. Multiple piston tubes communicating with the connecting cavity are fixedly connected to the connecting box. The number of piston tubes is the same as that of the heat exchange tubes and they are arranged one-to-one. The connecting cavity of the connecting box is connected to the air outlet of the base plate. A pressure sensor is installed at the air inlet of the base plate. A piston is slidably installed inside the piston tube. A drive structure for driving the piston to slide inside the piston tube is installed on the base plate.

[0007] Preferably, a No. 1 mounting plate is detachably installed at one end of the tank body, and multiple pressure measuring tubes are fixedly installed on the No. 1 mounting plate.

[0008] Preferably, a second mounting plate is detachably installed at the end of the tank away from the pressure measuring tube, and multiple piston tubes are fixedly installed on the second mounting plate.

[0009] Preferably, an air outlet pipe is fixedly installed on the base plate, the air outlet pipe is connected to the heat exchange chamber, a connecting pipe is fixedly installed on the connecting box, the connecting pipe is connected to the connecting cavity, and a connecting rigid pipe connects the air outlet pipe and the connecting pipe.

[0010] Preferably, an air inlet pipe is fixedly installed on the base plate, the air inlet pipe is connected to the heat exchange chamber, and the second air pressure sensor is fixedly installed at the end of the air inlet pipe.

[0011] Preferably, the driving structure includes piston rods, electric slide rails, and driving disks; the number of piston rods is the same as the number of pistons and they are arranged in a one-to-one correspondence; one end of each piston rod passes through a connecting box and is fixedly connected to the piston; the electric slide rails are fixedly mounted on the base plate; and the driving disks are fixedly mounted on the sliders of the electric slide rails.

[0012] When the drive disc slides, it can drive the piston rod to move laterally.

[0013] Preferably, the drive structure further includes electric push rods; the number of electric push rods is the same as the number of piston rods and they are arranged in a one-to-one correspondence, and multiple electric push rods are fixedly mounted on the drive plate, and the output shaft of the electric push rod is fixedly connected to the end of the piston rod away from the piston.

[0014] A test method for a graphite heat exchanger testing device, the test method is as follows:

[0015] Step 1: Install and secure the graphite heat exchanger on the mounting frame, and then install the test device and the graphite heat exchanger.

[0016] Step 2: The electric slide rail drives the drive disc to move, which in turn drives the piston rod and piston to move, and the piston slides inside the piston tube.

[0017] Step 3: As the piston slides, record the changes in values ​​from multiple pressure sensors (number one and number two).

[0018] Step 4: Multiple electric actuators gradually operate, recording the changes in values ​​from multiple pressure sensors No. 1 and No. 2.

[0019] Preferably, in this step, it is necessary to compare whether the changes in values ​​recorded by multiple No. 1 barometers are consistent.

[0020] Preferably, in the steps, it is necessary to compare whether the changes in values ​​recorded by multiple No. 1 pressure sensors are consistent, and when each electric push rod is changed to work, it is necessary to compare the changes in values ​​recorded by the No. 2 pressure sensor.

[0021] The testing device and method for graphite heat exchangers proposed in this invention have the following beneficial effects: through the setup of a base plate, placement rack, tank, sealing plate, heat exchange tube, pressure measuring tube, first pressure sensor, connecting box, piston tube, second pressure sensor, and driving structure, multiple independent spaces within the graphite heat exchanger can be tested simultaneously. Mutual verification and comparison tests can be performed, and the location and condition of leaks can be quickly determined. The operation is simple and convenient, and the testing efficiency is high. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a testing device for graphite heat exchangers proposed in this invention.

[0023] Figure 2 This is a side sectional view of a test device for a graphite heat exchanger proposed in this invention.

[0024] Figure 3 This is a cross-sectional view of the connection between the pressure measuring tube and the heat exchange tube in a testing device for a graphite heat exchanger proposed in this invention.

[0025] Figure 4 This is a cross-sectional view of the connection between the piston tube and the heat exchange tube in a testing device for a graphite heat exchanger proposed in this invention.

[0026] Figure 5 This is a cross-sectional view of the drive structure in a testing device for a graphite heat exchanger proposed in this invention.

[0027] In the diagram: 1. Base plate; 2. Placement rack; 3. Tank body; 4. Sealing plate; 5. Heat exchange tube; 6. Pressure measuring tube; 7. No. 1 pressure sensor; 8. Connecting box; 9. Piston tube; 10. No. 2 pressure sensor; 11. Piston; 12. No. 1 mounting plate; 13. No. 2 mounting plate; 14. Air outlet pipe; 15. Connecting pipe; 16. Connecting rigid pipe; 17. Air inlet pipe; 18. Piston rod; 19. Electric slide rail; 20. Drive plate; 21. Electric push rod. Detailed Implementation

[0028] Reference Figures 1-5This invention proposes a testing device for a graphite heat exchanger, comprising a graphite heat exchanger, a tank body 3, sealing plates 4, and heat exchange tubes 5. There are two sealing plates 4, both fixedly installed inside the tank body 3, and the tank body 3 and the two sealing plates 4 together form a sealed heat exchange chamber. The two sealing plates 4 and the tank body 3 constitute the shell of the graphite heat exchanger. There are multiple heat exchange tubes 5, each sequentially penetrating through two sealing plates 4. The openings at both ends of the heat exchange tubes 5 are located outside the heat exchange chamber, while the middle section of the heat exchange tubes 5 is located inside the heat exchange chamber. The structure of the graphite heat exchanger is existing technology.

[0029] like Figure 1 and Figure 2As shown, it also includes a base plate 1, on which two mounting brackets 2 are fixedly installed. The graphite heat exchanger is placed on the two mounting brackets 2. One end of the heat exchange tube 5 is detachably connected to a pressure measuring tube 6. A sealing structure (sealing ring, sealing gasket, etc.) is provided between the pressure measuring tube 6 and the heat exchange tube 5 to ensure the airtightness of the space inside the heat exchange tube 5. A pressure sensor 7 is installed at the end of the pressure measuring tube 6. The end of the pressure measuring tube 6 away from the heat exchange tube 5 is in a blocked state. The pressure sensor 7 is used to measure the pressure change inside the heat exchange tube 5. A connecting box 8 is fixedly installed on the base plate 1. A connecting cavity is opened inside the connecting box 8. Multiple piston tubes 9 are fixedly connected to the upper part of the box 8, communicating with the connecting cavity. The number of piston tubes 9 is the same as that of heat exchange tubes 5, and they are arranged one-to-one. The connecting cavity of the connecting box 8 is connected to the air outlet of the base plate 1. A second air pressure sensor 10 is installed at the air inlet of the base plate 1. A piston 11 is slidably installed inside the piston tube 9. The piston 11 separates the space inside the multiple heat exchange tubes 5 and the heat exchange chamber to form multiple independent spaces. A drive structure is installed on the base plate 1 to drive the piston 11 to slide inside the piston tube 9. During the sealing test, the drive structure simultaneously drives multiple pistons 11 to slide synchronously. As the piston moves, the space inside the piston tube 9 is compressed, but the gas volume remains unchanged. The gas pressure inside the heat exchange tube 5 increases. Multiple pressure sensors 7 detect the pressure changes inside the multiple heat exchange tubes 5. Assuming there are three heat exchange tubes 5, with the pressure inside the first heat exchange tube 5 being A1, the pressure inside the second heat exchange tube 5 being A2, and the pressure inside the third heat exchange tube 5 being A3, and the pressure inside the heat exchange chamber being B, when the three pistons 11 are driven to slide synchronously, if A1=A2=A3 (there is a certain difference, set as a difference), it indicates that the sealing performance of the three heat exchange tubes 5 is consistent, and no leakage has occurred. (In reality, there are many heat exchange tubes 5, and it is unlikely that all of them will leak. When a leak does occur, the leakage situation of each heat exchange tube 5 will not be consistent. Therefore, it is judged that the heat exchange tube 5 is in a non-leaking state.) Assuming that A1=A2>A3, then the third heat exchange tube 5 has a leak, and its sealing performance has failed. It can test the sealing performance of multiple heat exchange tubes 5 at the same time, and can also record the value change of the air pressure B in the heat exchange chamber. The value of the air pressure B in the heat exchange chamber gradually decreases. When the decrease of B is lower than the set value, the sealing performance of the heat exchange chamber has a problem.

[0030] like Figure 2 and Figure 3 As shown, a No. 1 mounting plate 12 is detachably installed at one end of the tank body 3. Multiple pressure measuring tubes 6 are fixedly installed on the No. 1 mounting plate 12. During installation, it is convenient to connect and install multiple pressure measuring tubes 6 and multiple heat exchange tubes 5, thereby improving work efficiency.

[0031] like Figure 2 and Figure 4As shown, a second mounting plate 13 is detachably installed at the end of the tank body 3 away from the pressure measuring tube 6. Multiple piston tubes 9 are fixedly installed on the second mounting plate 13, which facilitates the docking and installation of piston tubes 9 and heat exchange tubes 5, simplifies the testing work, and improves work efficiency.

[0032] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, an exhaust pipe 14 is fixedly installed on the tank body 3, and the exhaust pipe 14 is connected to the heat exchange chamber. A connecting pipe 15 is fixedly installed on the connecting box 8, and the connecting pipe 15 is connected to the connecting cavity. A connecting rigid pipe 16 connects the exhaust pipe 14 and the connecting pipe 15, and the heat exchange chamber and the connecting cavity are connected by the connecting rigid pipe 16, ensuring that the space inside the heat exchange chamber remains unchanged. When the sliding piston 11 is in motion, it ensures that the space inside the heat exchange chamber and the heat exchange tube 5 are in a state of mutual correlation (the movement of the piston 11 will simultaneously change the pressure inside the heat exchange tube 5 and the pressure inside the heat exchange chamber).

[0033] like Figure 1 , Figure 2 and Figure 4 As shown, an air inlet pipe 17 is fixedly installed on the tank body 3. The air inlet pipe 17 is connected to the heat exchange chamber. The second air pressure sensor 10 is fixedly installed at the end of the air inlet pipe 17. The air pressure in the heat exchange chamber is detected by the second air pressure sensor 10, and the tank body 3 is judged to be leaking based on the detected air pressure B value.

[0034] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the drive structure includes piston rods 18, electric slide rails 19, and drive discs 20. The number of piston rods 18 is the same as the number of pistons 11 and they are arranged one-to-one. One end of the piston rod 18 passes through the connecting box 8 and is fixedly connected to the piston 11. The diameter of the piston rod 18 is smaller than the inner diameter of the piston tube 9. The electric slide rails 19 are fixedly installed on the base plate 1, and the drive discs 20 are fixedly installed on the slider of the electric slide rails 19. When the drive discs 20 slide, they can drive the piston rods 18 to move laterally. In the actual test, the electric slide rails 19 work to drive the drive discs 20 to slide. When the drive discs 20 move, they push multiple piston rods 18 to move synchronously, so that the piston rods 18 push the pistons 11 to slide inside the piston tube 9, thereby changing the air pressure in multiple independent spaces inside the graphite heat exchanger. Then, they are compared and verified to determine whether the sealing performance of the graphite heat exchanger is qualified.

[0035] In practice, leaks can occur in various ways. For example, there are two possible locations for the leak in the third heat exchange tube 5: one is a leak inside the heat exchange chamber, and the other is a leak outside the heat exchange chamber. When determining the location of the leak in the third heat exchange tube 5, if the leak is inside the heat exchange chamber, during the aforementioned operation, the rate of increase in air pressure inside the third heat exchange tube 5 is slower than that inside the first and second heat exchange tubes 5, and the rate of decrease in air pressure inside the heat exchange chamber is also slower than under normal conditions. In addition, there is the possibility of a leak inside the heat exchange chamber, which requires further investigation. The specific procedures are as follows.

[0036] like Figure 1 , Figure 2 and Figure 5 As shown, the drive structure also includes electric push rods 21; the number of electric push rods 21 is the same as the number of piston rods 18 and they are set one-to-one. Multiple electric push rods 21 are fixedly mounted on the drive disk 20. The output shaft of the electric push rod 21 is fixedly connected to the end of the piston rod 18 away from the piston 11. After the above operation, the third heat exchange tube 5 with a sealing performance failure can be tested. At this time, the electric push rod 21 corresponding to the qualified heat exchange tube 5 is selected to work. The electric push rod 21 drives the corresponding piston rod 18 and piston 11 to move, recording the value change of the first pressure sensor 7 on the corresponding heat exchange tube 5, and simultaneously recording the value change of the second pressure sensor 10. Then, the electric push rod 21 is reset, driving the piston rod 18 and piston 11 to reset. Then, the electric push rod 21 corresponding to the third heat exchange tube 5 works to push the corresponding piston rod 18 and piston 11 to move, recording the value change of the first pressure sensor 7 and the value change of the second pressure sensor 10. At this time, there are several situations, as follows:

[0037] In the first scenario, a leak occurs in a section of the third heat exchange tube 5 located within the heat exchange chamber, while the tank 3 does not leak. As the piston 11 moves (compressing the gas inside the heat exchange tube 5), the amount of gas in the heat exchange chamber and the heat exchange tube 5 remains constant. The rate of pressure drop in the third heat exchange tube 5 slows down (compared to the normal heat exchange tube 5 under the same operating conditions), and the rate of pressure drop in the heat exchange chamber also decreases accordingly. Let the rate of drop be C.

[0038] The second scenario is that a leak occurs in a section of the third heat exchange tube 5 located within the heat exchange chamber, causing a leak in the tank 3. This causes the driving piston 11 to slide within the corresponding piston tube 9 (compressing the gas inside the heat exchange tube 5). The rate of decrease in gas pressure inside the third heat exchange tube 5 slows down, while the rate of decrease within the heat exchange chamber is C-. This reduces the gas pressure within the heat exchange chamber, allowing the gas inside the third heat exchange tube 5 to enter the heat exchange chamber. Additionally, outside air will also enter the tank 3 through the leak under the influence of gas pressure.

[0039] The third scenario is that a leak occurs in the section of the third heat exchange tube 5 located outside the heat exchange chamber, while the tank 3 does not leak. Under the movement of the piston 11 (compressing the gas inside the heat exchange tube 5), the pressure rise rate inside the third heat exchange tube 5 slows down, while the pressure decrease rate inside the heat exchange chamber remains at a normal speed.

[0040] Fourthly, a leak occurs in the section of the third heat exchange tube 5 located outside the heat exchange chamber, causing a leak in the tank 3. When the piston 11 moves (compressing the gas inside the heat exchange tube 5), the pressure rise rate inside the third heat exchange tube 5 slows down, and the pressure decrease rate inside the heat exchange chamber also slows down. (In this situation, it is necessary to drive the piston 11 corresponding to the normal heat exchange tube 5. Since the heat exchange chamber and heat exchange tube 5 are relatively closed under normal conditions, their internal volume remains constant. When the piston 11 moves, although air is compressed, the combined volume of the two does not change. It is possible to calculate whether there is a leak in the tank 3.) The above operation is simple and convenient, and can simultaneously test the sealing of multiple independent spaces in the graphite heat exchanger, quickly determining which independent space is leaking (including internal leaks), facilitating maintenance by staff and improving the efficiency of testing.

[0041] The specific testing method is as follows:

[0042] Step 1: Install the graphite heat exchanger on the placement rack 2 and fix it in place. Then install the test device and the graphite heat exchanger.

[0043] Step 2: The electric slide rail 19 drives the drive disc 20 to move, and the drive disc 20 drives the piston rod 18 and piston 11 to move. The piston 11 slides inside the piston tube 9.

[0044] Step 3: As the piston 11 slides, record the changes in values ​​of multiple pressure sensors 7 and 10. It is necessary to compare whether the changes in values ​​recorded by multiple pressure sensors 7 are consistent.

[0045] Step 4: Multiple electric push rods 21 gradually operate, recording the changes in values ​​of multiple pressure sensors 7 and 10. It is necessary to compare whether the changes in values ​​recorded by multiple pressure sensors 7 are consistent. When each electric push rod 21 is changed, it is necessary to compare and record the changes in values ​​of pressure sensor 10. In actual operation, for example, when testing graphite heat exchangers in the same batch, the normal sealing pressure will be around the standard value.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A testing device for graphite heat exchangers, characterized in that, The system includes a graphite heat exchanger, which includes a tank (3), a sealing plate (4), and heat exchange tubes (5). There are two sealing plates (4), both of which are fixedly installed inside the tank (3). The tank (3) and the two sealing plates (4) together form a sealed heat exchange chamber. There are multiple heat exchange tubes (5), which pass through the two sealing plates (4) in sequence. The openings at both ends of the heat exchange tubes (5) are located outside the heat exchange chamber. It also includes a base plate (1), on which two placement racks (2) are fixedly installed. The graphite heat exchanger is placed on the two placement racks (2). One end of the heat exchange tube (5) is detachably connected to a pressure measuring tube (6). A first pressure sensor (7) is installed at the end of the pressure measuring tube (6). A connecting box (8) is fixedly installed on the base plate (1). A connecting cavity is opened in the connecting box (8). Multiple piston tubes (9) connected to the connecting cavity are fixedly connected on the connecting box (8). The number of piston tubes (9) is the same as that of the heat exchange tubes (5) and they are set one to one. The connecting cavity of the connecting box (8) is connected to the air outlet of the base plate (1). A second pressure sensor (10) is installed at the air inlet of the base plate (1). A piston (11) is slidably installed in the piston tube (9). A driving structure for driving the piston (11) to slide in the piston tube (9) is installed on the base plate (1). One end of the tank (3) is detachably mounted with a No. 1 mounting plate (12), and multiple pressure measuring tubes (6) are fixedly mounted on the No. 1 mounting plate (12); The end of the tank (3) away from the pressure measuring tube (6) is detachably mounted with a second mounting plate (13), and multiple piston tubes (9) are fixedly mounted on the second mounting plate (13); An exhaust pipe (14) is fixedly installed on the tank (3), the exhaust pipe (14) is connected to the heat exchange chamber, a connecting pipe (15) is fixedly installed on the connecting box (8), the connecting pipe (15) is connected to the connecting cavity, and a connecting rigid pipe (16) connects the exhaust pipe (14) and the connecting pipe (15).

2. The testing apparatus for graphite heat exchangers according to claim 1, characterized in that, An air inlet pipe (17) is fixedly installed on the tank (3). The air inlet pipe (17) is connected to the heat exchange chamber. The second air pressure sensor (10) is fixedly installed at the end of the air inlet pipe (17).

3. The testing apparatus for graphite heat exchangers according to claim 1, characterized in that, The drive structure includes piston rods (18), electric slide rails (19), and drive disks (20); the number of piston rods (18) is the same as the number of pistons (11) and they are arranged in a one-to-one correspondence. One end of the piston rod (18) passes through the connecting box (8) and is fixedly connected to the piston (11). The electric slide rails (19) are fixedly installed on the base plate (1), and the drive disks (20) are fixedly installed on the slider of the electric slide rails (19). When the drive disc (20) slides, the drive disc (20) can drive the piston rod (18) to move laterally.

4. The testing apparatus for graphite heat exchangers according to claim 3, characterized in that, The drive structure also includes electric push rods (21); the number of electric push rods (21) is the same as the number of piston rods (18) and they are set one-to-one. Multiple electric push rods (21) are fixedly installed on the drive disk (20), and the output shaft of the electric push rod (21) is fixedly connected to the end of the piston rod (18) away from the piston (11).

5. A test method for a graphite heat exchanger testing device, employing the testing device for graphite heat exchangers as described in any one of claims 1-4, characterized in that... The testing method is as follows: Step 1: Install the graphite heat exchanger on the placement rack (2) and fix it in place; install the test device and the graphite heat exchanger. Step 2: The electric slide rail (19) drives the drive disc (20) to move, and the drive disc (20) drives the piston rod (18) and piston (11) to move. The piston (11) slides inside the piston tube (9). Step 3: As the piston (11) slides, record the changes in values ​​of multiple pressure sensors (7 and 10). Step 4: Multiple electric push rods (21) gradually operate, recording the numerical changes of multiple No. 1 air pressure sensor (7) and No. 2 air pressure sensor (10).

6. The testing method for a graphite heat exchanger testing device according to claim 5, characterized in that, In step 3, it is necessary to compare whether the changes in values ​​recorded by multiple No. 1 barometers (7) are consistent.

7. The testing method for a graphite heat exchanger testing device according to claim 5, characterized in that, In step 4, it is necessary to compare whether the changes in values ​​recorded by multiple No. 1 pressure sensors (7) are consistent. When each electric push rod (21) is changed to work, it is necessary to compare the changes in values ​​recorded by the No. 2 pressure sensor (10).

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