Method and system for online inner leakage detection of heat exchanger and heat exchanger thereof
By monitoring the flow rate and pressure difference ΔQ and ΔP, combined with a logic judgment unit and controller, online internal leakage detection of heat exchangers was achieved, solving the problem of inaccurate judgment of heat exchanger corrosion perforation and avoiding production fluctuations and equipment damage.
Patent Information
- Application Number
- CN202410654815.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-11-25
AI Technical Summary
Existing heat exchangers cannot accurately detect internal leaks when corrosion perforation or scaling occurs, leading to production fluctuations or equipment damage. Furthermore, existing detection methods require shutting down the equipment for pressure testing to confirm the leaks.
By monitoring the flow difference ΔQ between the cooling medium and the return water, and the pressure difference ΔP between the cooling medium and the cooled medium, combined with the logic judgment unit and the controller, online internal leakage detection and alarm are achieved.
It enables online internal leakage detection of heat exchangers, shortens the time to detect corrosion perforation, avoids production fluctuations and equipment damage, and provides a basis for production adjustments.
Smart Images
Figure CN121007682A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of heat exchangers, in particular to a heat exchanger online internal leakage detection method and system and a heat exchanger thereof. BACKGROUND
[0002] In the process device of a natural gas purification plant, a plurality of process flow points are provided with water-cooled heat exchangers to cool the process medium, so that the temperature of the cooled medium meets the requirements for entering the next process flow. The water-cooled heat exchanger will often occur due to the corrosion of the process medium, resulting in perforation of the heat exchanger or perforation of the heat exchanger caused by the water quality problem of the circulating water. Once the water-cooled heat exchanger is corroded and perforated, it will cause the circulating water to enter the process medium, causing the composition of the cooled process medium to change or the process medium to leak into the circulating water system, causing the circulating water to be contaminated. If it is not found in time, it will cause production fluctuations, and even cause equipment damage and device shutdown. The existing confirmation measures for internal leakage of the water-cooled heat exchanger are usually through pressure test of the shutdown heat exchanger; in addition, when the heat exchanger has serious internal leakage, it can be predicted by operating experience, but whether it is internal leakage still needs to be confirmed by pressure test of the shutdown heat exchanger.
[0003] In addition, due to the advantages of simple structure, high heat exchange efficiency, etc., the water-cooled heat exchanger is widely used in the fields of oil refining, chemical industry, thermal power generation, medicine, etc., and the problem of being unable to accurately determine the corrosion perforation and leakage of the water-cooled heat exchanger also exists. SUMMARY
[0004] To solve the problem that the corrosion perforation and leakage of the existing heat exchanger cannot be accurately determined, the purpose of the present application is to provide a heat exchanger online internal leakage detection method and system and a heat exchanger thereof, so as to realize online internal leakage detection, judgment and alarm of the heat exchanger, greatly shorten the time for discovering the corrosion perforation of the heat exchanger, provide a basis for the operation adjustment of the production device, avoid production fluctuations caused by long internal leakage of the heat exchanger, and also avoid the intensification of the corrosion perforation of the heat exchanger and the device shutdown caused by equipment damage.
[0005] The technical solution of the present application to solve the above technical problems is as follows:
[0006] In one aspect, the present application provides a heat exchanger online internal leakage detection method, which comprises:
[0007] Obtaining the flow difference value of the cooling medium entering the heat exchanger and the backwater before the heat exchanger is put into operation, denoted as ΔQset;
[0008] Obtaining the flow difference value of the cooling medium entering the heat exchanger and the backwater flowing out of the heat exchanger after the heat exchanger is put into operation, denoted as ΔQ, and comparing the numerical values of ΔQ and ΔQ 设 .
[0009] After the heat exchanger is put into operation, the pressure parameters of the cooling medium and the cooled medium entering the heat exchanger are obtained and compared, and denoted as ΔP;
[0010] According to the values of ΔP greater than 0 or less than 0 and ΔQ and ΔQ 设 , whether the heat exchanger has internal leakage and whether the internal leakage alarm is triggered are judged.
[0011] Further, in the heat exchanger online internal leakage detection method, according to the values of ΔP greater than 0 or less than 0 and ΔQ and ΔQ 设 , whether the heat exchanger has internal leakage and whether the internal leakage alarm is triggered are judged, comprising:
[0012] When ΔP is greater than 0 and ΔQ is greater than ΔQ 设 , the heat exchanger has internal leakage and triggers the internal leakage alarm;
[0013] Or, when ΔP is greater than 0 and ΔQ is less than ΔQ 设 , the heat exchanger does not have internal leakage and does not trigger the internal leakage alarm.
[0014] Further, in the heat exchanger online internal leakage detection method, according to the values of ΔQ and ΔQ 设 and ΔP greater than 0 or less than 0, whether the heat exchanger has internal leakage and whether the internal leakage alarm is triggered are judged, further comprising:
[0015] When ΔP is less than 0 and ΔQ is less than ΔQ 设 , the heat exchanger has internal leakage and triggers the internal leakage alarm;
[0016] Or, when ΔP is less than 0 and ΔQ is greater than ΔQ 设 , the heat exchanger does not have internal leakage and does not trigger the internal leakage alarm.
[0017] Another aspect of the present application provides a heat exchanger online internal leakage detection system, comprising:
[0018] A monitoring module is arranged on the heat exchanger, and the monitoring module is used for monitoring the flow of the cooling medium and the return water of the heat exchanger, and the pressure of the cooling medium and the cooled medium;
[0019] A controller is connected with the monitoring module through a signal line, and the controller judges whether the heat exchanger has internal leakage and whether the internal leakage alarm is triggered according to the parameters collected by the monitoring module.
[0020] Further, in the system for detecting the on-line inner leakage of the heat exchanger, the monitoring module comprises a first flow meter, a second flow meter, a first pressure transmitter and a second pressure transmitter, the first flow meter and the first pressure transmitter are arranged on the cooling medium communication pipeline of the heat exchanger, the second flow meter is arranged on the return water communication pipeline of the heat exchanger, and the second pressure transmitter is arranged on the cooling medium inlet communication pipeline of the heat exchanger.
[0021] Further, in the system for detecting the on-line inner leakage of the heat exchanger, the control logic judgment unit and the microprogram control unit, the logic judgment unit performs logical operation on the parameters collected by the first flow meter, the second flow meter, the first pressure transmitter and the second pressure transmitter to judge whether the heat exchanger has inner leakage, and the microprogram control unit triggers the inner leakage alarm according to the logical judgment result of the logic judgment unit.
[0022] Further, in the system for detecting the on-line inner leakage of the heat exchanger, the logic operation function block in the controller comprises a subtracter, a first comparator, a NOT gate, a second comparator, a third comparator, a first AND gate, a second AND gate and an OR gate.
[0023] The first pressure transmitter is connected to the first input end of the first comparator, and the second pressure transmitter is connected to the second input end of the first comparator.
[0024] The output end of the first comparator is connected to the first input end of the first AND gate, and the output end of the first comparator is connected to the NOT gate and then connected to the first input end of the second AND gate.
[0025] The first flow meter is connected to the first input end of the subtracter, and the second flow meter is connected to the second input end of the subtracter.
[0026] The output end of the subtracter is connected to the input end of the second comparator, and the output end of the second comparator is connected to the second input end of the first AND gate.
[0027] The output end of the subtracter is connected to the input end of the third comparator, and the output end of the third comparator is connected to the second input end of the second AND gate.
[0028] The output end of the first AND gate and the output end of the second AND gate are connected in parallel to the input end of the OR gate.
[0029] Further, in the system for detecting the on-line inner leakage of the heat exchanger, the system further comprises a first valve and a second valve, the first valve is arranged on the cooling medium communication pipeline, and the second valve is arranged on the return water communication pipeline.
[0030] Further, in the heat exchanger online inner leakage detection system, the system further comprises a third valve arranged on a pipeline communicating the cooling medium and the backwater.
[0031] The application further provides a heat exchanger with an inner leakage detection function, which comprises the heat exchanger online inner leakage detection system.
[0032] The application has the following advantages:
[0033] The heat exchanger online inner leakage detection method and system provided by the application realize online inner leakage detection, judgment and alarm of the heat exchanger, greatly shorten the time for discovering corrosion perforation of the heat exchanger, provide a basis for operation adjustment of a production device, avoid production device fluctuation caused by the fact that circulating water enters process medium due to long-time corrosion perforation of the heat exchanger, and change of components of the cooled process medium or pollution of the circulating water caused by the fact that the process medium leaks into the circulating water system, and also avoid corrosion perforation of the heat exchanger and device damage caused by device shutdown. BRIEF DESCRIPTION OF DRAWINGS
[0034] The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
[0035] Figure 1 The flow chart of the heat exchanger online inner leakage detection method of the application;
[0036] Figure 2 The structural schematic diagram of the heat exchanger online inner leakage detection system of the application.
[0037] Markings in the drawings and corresponding names of parts:
[0038] In the drawings: 1-first valve, 2-second valve, 3-third valve, 4-first flow meter, 5-second flow meter, 6-first pressure transmitter, 7-second pressure transmitter, B-subtracter, D1-first comparator, C-NOT gate, D2-second comparator, D3-third comparator, A1-first AND gate, A2-second AND gate, E-OR gate. DETAILED DESCRIPTION
[0039] To make the objectives, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described below in connection with the drawings of the embodiments of the application. Obviously, the described embodiments are some but not all of the embodiments of the application. The components of the embodiments of the application described and shown in the drawings can be arranged and designed in various different configurations.
[0040] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.
[0041] Embodiment 1
[0042] Please refer to Figure 1 , the embodiment of the application provides a heat exchanger online inner leakage detection method, the method comprises:
[0043] Step S1: obtaining the flow difference value of the cooling medium entering the heat exchanger and the backwater before the heat exchanger is put into operation, denoted as ΔQ 设；
[0044] Step S2: obtaining the flow difference value of the cooling medium entering the heat exchanger and the backwater flowing out of the heat exchanger after the heat exchanger is put into operation, denoted as ΔQ, comparing the numerical value of ΔQ and ΔQ 设 .
[0045] Step S3: obtaining the pressure parameters of the cooling medium entering the heat exchanger and the cooled medium after the heat exchanger is put into operation, and comparing them, denoted as ΔP;
[0046] Step S4: judging whether the heat exchanger has inner leakage and whether the inner leakage alarm is triggered according to whether ΔP is greater than 0 or less than 0 and the numerical value of ΔQ and ΔQ 设 .
[0047] Further, according to whether ΔP is greater than 0 or less than 0 and the numerical value of ΔQ and ΔQ 设 to judge whether the heat exchanger has inner leakage and whether the inner leakage alarm is triggered, comprising:
[0048] When ΔP is greater than 0 and ΔQ is greater than ΔQ 设 , the heat exchanger has inner leakage and triggers the inner leakage alarm;
[0049] Or, when ΔP is greater than 0 and ΔQ is less than ΔQ 设 , the heat exchanger does not have inner leakage and does not trigger the inner leakage alarm.
[0050] Further, according to whether ΔP is greater than 0 or less than 0 and the numerical value of ΔQ and ΔQ 设 to judge whether the heat exchanger has inner leakage and whether the inner leakage alarm is triggered, further comprising:
[0051] When ΔP is less than 0 and ΔQ is less than ΔQ 设 , the heat exchanger has inner leakage and triggers the inner leakage alarm;
[0052] Or, when ΔP is less than 0 and ΔQ is greater than ΔQ设 When the heat exchanger does not occur internal leakage and does not trigger internal leakage alarm.
[0053] The internal leakage detection principle of the heat exchanger online internal leakage detection method of the present application is as follows: when the pressure of the cooling medium is greater than that of the cooled medium, the internal leakage of the heat exchanger occurs under the working condition of the pressure of the cooled medium, the cooling medium enters the cooled medium to cause the change of the composition of the cooled medium; at the same time, the flow of the cooling medium out of the heat exchanger decreases, that is, the backwater flow decreases, thereby causing the difference between the flow of the cooling medium and the backwater flow to increase. When the pressure of the cooling medium is less than that of the cooled medium, the internal leakage of the heat exchanger occurs under the working condition of the pressure of the cooled medium, the cooled medium enters the cooling medium to cause the cooling medium to be contaminated; at the same time, the flow of the cooling medium out of the heat exchanger increases, that is, the backwater flow increases, thereby causing the difference between the flow of the cooling medium and the backwater flow to decrease.
[0054] The heat exchanger online internal leakage detection method and system provided by the present application realize the online internal leakage detection, judgment and alarm of the heat exchanger, greatly shorten the time for discovering the corrosion perforation of the heat exchanger, provide the basis for the operation adjustment of the production device, avoid the production fluctuation caused by the change of the composition of the cooled process medium or the pollution of the circulating water caused by the leakage of the process medium into the circulating water system, and also avoid the intensification of the corrosion perforation of the heat exchanger and the damage of the equipment to cause the shutdown of the device.
[0055] Embodiment 2
[0056] Please refer to Figure 1 and Figure 2 The system provided by the embodiment of the present application comprises:
[0057] A monitoring module is arranged on the heat exchanger, and the monitoring module is used for monitoring the flow of the cooling medium and the backwater of the heat exchanger and the pressure of the cooling medium and the cooled medium.
[0058] A controller is connected with the monitoring module through a signal line, and the controller judges whether the internal leakage of the heat exchanger occurs and whether the internal leakage alarm is triggered according to the parameters collected by the monitoring module.
[0059] Further, the monitoring module comprises a first flowmeter 4, a second flowmeter 5, a first pressure transmitter 6 and a second pressure transmitter 7, the first flowmeter 4 and the first pressure transmitter 6 are arranged on the cooling medium communication pipeline of the heat exchanger, the second flowmeter 5 is arranged on the backwater communication pipeline of the heat exchanger, and the second pressure transmitter 7 is arranged on the cooled medium inlet communication pipeline of the heat exchanger.
[0060] Further, the controller comprises a logic judging unit and a microprogram control unit, the logic judging unit performs logical operation on parameters collected by the first flow meter 4, the second flow meter 5, the first pressure transmitter 6 and the second pressure transmitter 7 to judge whether the heat exchanger has internal leakage, and the microprogram control unit triggers internal leakage alarm according to the logical judgment result of the logic judging unit.
[0061] Further, the logic operation function block in the controller comprises a subtracter B, a first comparator D1, a NOT gate C, a second comparator D2, a third comparator D3, a first AND gate A1, a second AND gate A2 and an OR gate E.
[0062] The first pressure transmitter 6 is connected to the first input end of the first comparator D1, and the second pressure transmitter 7 is connected to the second input end of the first comparator D1.
[0063] The output end of the first comparator D1 is connected to the first input end of the first AND gate A1, and the output end of the first comparator D1 is connected to the NOT gate C which is then connected to the first input end of the second AND gate A2.
[0064] The first flow meter 4 is connected to the first input end of the subtracter B, and the second flow meter 5 is connected to the second input end of the subtracter B.
[0065] The output end of the subtracter B is connected to the input end of the second comparator D2, and the output end of the second comparator D2 is connected to the second input end of the first AND gate A1.
[0066] The output end of the subtracter B is connected to the input end of the third comparator D3, and the output end of the third comparator D3 is connected to the second input end of the second AND gate A2.
[0067] The output end of the first AND gate A1 and the output end of the second AND gate A2 are connected in parallel to the input end of the OR gate E.
[0068] Further, the system further comprises a first valve 1 and a second valve 2, the first valve 1 is arranged on the cooling medium communication pipeline, and the second valve 2 is arranged on the backwater communication pipeline.
[0069] Further, the system further comprises a third valve 3, which is arranged on the pipeline communicating the cooling medium and the backwater.
[0070] Specifically, in the heat exchanger online internal leakage detection system provided by the application, the heat exchanger is a shell-and-tube heat exchanger, and the cooling medium is usually water, and can also be other liquid cooling medium.
[0071] The first flow meter 4 and the second flow meter 5 are flow meters of the same type and have the same range and accuracy. In the embodiment, the measured value of the first flow meter 4 is denoted as FT1, and the measured value of the second flow meter 5 is denoted as FT2.
[0072] The first pressure transmitter 6 and the second pressure transmitter 7 are pressure meters of the same type and have the same range and accuracy. In the embodiment, the measured value of the first pressure transmitter 6 is denoted as PT1, and the measured value of the second pressure transmitter 7 is denoted as PT2.
[0073] The first valve 1, the second valve 2 and the third valve 3 can be selected from start valves such as manual valves and electric valves. For the convenience of operation, the first valve 1, the second valve 2 and the third valve 3 are selected from start valves of the same type. Preferably, the first valve 1, the second valve 2 and the third valve 3 are all selected from manual valves, which are convenient to operate and have high reliability.
[0074] The controller is a logic control unit or a microprogram control unit having a logic program editing function, and is electrically connected to the first flow meter 4, the second flow meter 5, the first pressure transmitter 6 and the second pressure transmitter 7 through signal cables.
[0075] Before the heat exchanger is put into operation, the third valve 3 is opened, and then the first valve 1 and the second valve 2 are closed in sequence. The first flow meter 4 measures the flow value FT1 of the cooling water 设 , and the second flow meter 5 measures the flow value FT2 of the return water 设 . The difference ΔQ between the flow values of the two flow meters is calculated 设 (FT1 设 is the minuend, and FT2 设 is the subtrahend), and is used as a comparison value of the flow meter difference. In theory, the measured values of the two flow meters should be the same, and the difference ΔQ 设 is zero. However, in actual application, although the two flow meters have the same accuracy level, their measurement errors are different due to external factors such as installation position and internal components of the flow meters, so their measured values are also different, that is, the difference ΔQ 设 is not zero.
[0076] After the heat exchanger is put into operation (the third valve 3 is closed, and the first valve 1 and the second valve 2 are opened), the first flow meter 4 measures the flow value FT1 of the cooling water, and the second flow meter 5 measures the flow value FT2 of the return water. The measured values of the two flow meters are subtracted in a subtracter B (FT1 is the minuend, and FT2 is the subtrahend), and the flow difference ΔQ between the two flow meters is obtained. Then, the flow difference ΔQ is compared by the second comparator D2 and the third comparator D3.
[0077] In the second comparator D2, ΔQ is greater than ΔQ 设then the second comparator D2 outputs 1, otherwise 0; in the third comparator D3, ΔQ is less than ΔQ 设 then the third comparator D3 outputs 1, otherwise 0.
[0078] At the same time, the first pressure transmitter 6 measures the pressure value PT1 of the cooling water, and the second pressure transmitter 7 measures the pressure value PT2 of the cooled medium. The measured values of the two pressure transmitters are compared by the first comparator D1. When PT1 is greater than PT2, the first comparator D1 outputs 1, otherwise 0.
[0079] When PT1 is greater than PT2 (i.e. ΔP is greater than 0), the first comparator D1 outputs 1, and ΔQ is less than ΔQ 设 The bypass does not work.
[0080] If ΔQ is greater than ΔQ 设 then the second comparator D2 outputs 1, and the third comparator D3 outputs 0; the two inputs of the first AND gate A1 come from the output of the first comparator D1 which is 1 and the output of the second comparator D2 which is 1, so the first AND gate A1 outputs 1; the two inputs of the second AND gate A2 come from the output of the first comparator D1 which is 0 after being inverted by the NOT gate C and the output of the third comparator D3 which is 0, so the second AND gate A2 outputs 0; the two inputs of the OR gate E come from the output of the first AND gate A1 which is 1 and the output of the second AND gate A2 which is 0, so the output of the OR gate E is 1, triggering the alarm device to realize the leakage alarm.
[0081] If ΔQ is less than ΔQ 设 then the second comparator D2 outputs 0, and the third comparator D3 outputs 1; the two inputs of the first AND gate A1 come from the output of the first comparator D1 which is 1 and the output of the second comparator D2 which is 0, so the first AND gate A1 outputs 0; the two inputs of the second AND gate A2 come from the output of the first comparator D1 which is 0 after being inverted by the NOT gate C and the output of the third comparator D3 which is 1, so the second AND gate A2 outputs 0; the two inputs of the OR gate E are both 0, so the output of the OR gate E is 0, not triggering the alarm device to realize the leakage alarm.
[0082] When PT1 is less than PT2 (i.e. ΔP is less than 0), the first comparator D1 outputs 0, and ΔQ is greater than ΔQ 设 The bypass does not work.
[0083] If ΔQ is greater than ΔQ 设If the output of the second comparator D2 is 1 and the output of the third comparator D3 is 0, then the output of the first AND gate A1 is 0. If the output of the first comparator D1 is 0 and the output of the second comparator D2 is 1, then the output of the first AND gate A1 is 0. If the output of the second AND gate A2 is 1 after being inverted, then the output of the second AND gate A2 is 0. If the output of the first comparator D1 is 1 and the output of the third comparator D3 is 0, then the output of the second AND gate A2 is 0. If the output of the OR gate E is 0 and the output of the OR gate E is 0, then the output of the OR gate E is 0, and the alarm device is not triggered to perform a leakage alarm.
[0084] If ΔQ is less than ΔQ 设 If the output of the second comparator D2 is 0 and the output of the third comparator D3 is 1, then the output of the first AND gate A1 is 0. If the output of the first comparator D1 is 0 and the output of the second comparator D2 is 0, then the output of the first AND gate A1 is 0. If the output of the second AND gate A2 is 1 after being inverted, then the output of the second AND gate A2 is 1. If the output of the first AND gate A1 is 0 and the output of the second AND gate A2 is 1, then the output of the second AND gate E is 1, triggering the alarm device to realize the leakage alarm.
[0085] Example 3
[0086] Please refer to Figure 1 and Figure 2 This invention provides a heat exchanger with internal leakage detection function. The heat exchanger includes a system for online internal leakage detection as described in Embodiment 2, so as to realize online internal leakage detection, judgment and alarm of the heat exchanger.
[0087] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A method for detecting an in-line leak of a heat exchanger, the method comprising: The method comprises: The difference in flow rate of the cooling medium before entering the heat exchanger and the backwater before the heat exchanger is put into operation is denoted as ΔQ 设； After the heat exchanger is put into operation, the flow difference between the cooling medium entering the heat exchanger and the backwater flowing out of the heat exchanger is recorded as ΔQ, and the numerical value of ΔQ is compared with that of ΔQ 设 . After the heat exchanger is put into operation, the pressure parameters of the cooling medium and the cooled medium entering the heat exchanger are acquired and compared, and are recorded as ΔP; According to the value of ΔP greater than 0 or less than 0 and ΔQ and ΔQ 设 The numerical size of the value of ΔP greater than 0 or less than 0 and ΔQ and ΔQ of the heat exchanger and whether the internal leakage alarm is triggered.
2. The method of claim 1, wherein, According to the value of ΔP greater than 0 or less than 0 and ΔQ and ΔQ 设 The method for judging whether the heat exchanger has internal leakage and triggering internal leakage alarm includes: When ΔP is greater than 0 and ΔQ is greater than ΔQ 设 , the heat exchanger has internal leakage and triggers an internal leakage alarm; or, when ΔP is greater than 0 and ΔQ is less than ΔQ 设 when ΔP is greater than 0 and ΔQ is less than ΔQ when ΔP is greater than 0 and ΔQ is less than ΔQ 3. The method of claim 2, wherein, According to the value of ΔP greater than 0 or less than 0 and ΔQ and ΔQ 设 The numerical size of the value of ΔP greater than 0 or less than 0 and ΔQ and ΔQ The numerical size of the value of ΔP greater than 0 or less than 0 and ΔQ and ΔQ When ΔP is less than 0 and ΔQ is less than ΔQ 设 , the heat exchanger has internal leakage and triggers an internal leakage alarm. Or, when ΔP is less than 0 and ΔQ is greater than ΔQ 设 , the heat exchanger does not have internal leakage and does not trigger an internal leakage alarm.
4. A system for detecting an in-line leak of a heat exchanger, the system comprising: The system comprises: A monitoring module, which is arranged on the heat exchanger and is used for monitoring the flow of the cooling medium and the backwater of the heat exchanger and the pressure of the cooling medium and the cooled medium; A controller, which is connected with the monitoring module through a signal line, and judges whether the heat exchanger has internal leakage and whether the internal leakage alarm is triggered according to the parameters collected by the monitoring module.
5. The heat exchanger on-line leak detection system of claim 4, wherein, The monitoring module comprises a first flowmeter, a second flowmeter, a first pressure transmitter and a second pressure transmitter, the first flowmeter and the first pressure transmitter are arranged on the cooling medium communication pipeline of the heat exchanger, the second flowmeter is arranged on the backwater communication pipeline of the heat exchanger, and the second pressure transmitter is arranged on the cooled medium inlet communication pipeline of the heat exchanger.
6. The heat exchanger on-line leak detection system of claim 4, wherein, The controller comprises a logic judgment unit and a microprogram control unit, the logic judgment unit performs logical operation to judge whether the heat exchanger has internal leakage according to the parameters collected by the first flowmeter, the second flowmeter, the first pressure transmitter and the second pressure transmitter, and the microprogram control unit judges whether the internal leakage alarm is triggered according to the logical judgment result of the logic judgment unit.
7. The heat exchanger on-line leak detection system of claim 6, wherein, The logic operation function block in the controller comprises a subtracter, a first comparator, a NOT gate, a second comparator, a third comparator, a first AND gate, a second AND gate and an OR gate; the first input end of the first comparator is connected with the first pressure transmitter, and the second input end of the first comparator is connected with the second pressure transmitter; The output end of the first comparator is connected with the first input end of the first AND gate, and the output end of the first comparator is connected with the NOT gate and then connected with the first input end of the second AND gate; The first input end of the subtracter is connected with the first flowmeter, and the second input end of the subtracter is connected with the second flowmeter; The output end of the subtracter is connected with the input end of the second comparator, and the output end of the second comparator is connected with the second input end of the first AND gate; The output end of the subtracter is connected with the input end of the third comparator, and the output end of the third comparator is connected with the second input end of the second AND gate; The output end of the first AND gate and the output end of the second AND gate are connected in parallel with the input end of the OR gate.
8. The heat exchanger on-line leak detection system of claim 4, wherein, The system further comprises a first valve and a second valve, the first valve is arranged on the cooling medium communication pipeline, and the second valve is arranged on the backwater communication pipeline.
9. The heat exchanger on-line leak detection system of claim 4, wherein, The system further comprises a third valve, which is arranged on the pipeline connecting the cooling medium and the backwater.
10. A heat exchanger having an internal leak detection function, characterized by comprising: The heat exchanger comprises the system for detecting internal leakage of the heat exchanger online according to any one of claims 3-9.