A leak detection apparatus, system and method

Abstract

The embodiment of the present application provides a kind of leakage detection device, system and method, it is related to industrial detection technical field, leakage detection device includes: detection unit and at least one acquisition unit;Wherein, each acquisition unit includes electrode probe and signal processor;Electrode probe is arranged on the lateral wall of coal-fired boiler flue, and contact with the ash medium in flue;When leakage detection device works, electrode probe and ash medium form equivalent resistance detection loop;Each signal processor is electrically connected with corresponding electrode probe respectively, for collecting the response signal of corresponding equivalent resistance detection loop, and response signal is sent to detection unit;Detection unit is used to determine whether the low-temperature coal economizer arranged inside flue leaks according to response signal.The present application can identify whether low-temperature coal economizer leaks in time, improve the accuracy and sensitivity of leakage detection.

Description

Technical Field

[0001] The present invention relates to the field of industrial testing technology, and in particular to a leak detection device, system and method. Background Technology

[0002] Low-temperature economizers are currently the core heat exchange equipment for the utilization of waste heat from flue gas in coal-fired power plants in China. They are mainly used to recover waste heat from flue gas and reduce exhaust gas temperature, playing an important role in improving unit energy efficiency and ensuring safe operation of the unit.

[0003] Existing methods for detecting leaks in low-temperature economizers mainly rely on flue gas temperature and humidity monitoring, which are easily affected by factors such as flue ash accumulation and operating condition fluctuations. They are not sensitive enough to early, minor leaks and make it difficult to determine in a timely and accurate manner whether a leak has occurred. Summary of the Invention

[0004] This invention provides a leak detection device, system, and method that can promptly identify whether a low-temperature economizer is leaking, thereby improving the accuracy and sensitivity of leak detection.

[0005] In a first aspect, the leakage detection device provided in the embodiments of the present invention includes: a detection unit and at least one acquisition unit; wherein, each acquisition unit includes an electrode probe and a signal processor; the electrode probe is disposed on the side wall of the flue of a coal-fired boiler and is in contact with the ash medium inside the flue; when the leakage detection device is working, the electrode probe and the ash medium form an equivalent resistance detection circuit; each signal processor is electrically connected to the corresponding electrode probe and is used to acquire the response signal of the corresponding equivalent resistance detection circuit and send the response signal to the detection unit; the detection unit is used to determine whether the low-temperature economizer installed inside the flue has leaked based on the response signal.

[0006] Secondly, the leakage detection system provided in the embodiments of the present invention includes the leakage detection device of any embodiment of the present invention.

[0007] Thirdly, the leakage detection method provided in this embodiment of the invention is applied to the detection unit of a leakage detection device, including: for any response signal sent by a signal processor, determining the equivalent resistance value of the ash accumulation medium based on the response signal; and determining, based on the equivalent resistance value, whether a leak has occurred at the electrode probe setting position corresponding to the signal processor in the low-temperature economizer installed inside the flue.

[0008] In this embodiment of the invention, the leakage detection device is designed to include a detection unit and at least one acquisition unit. Each acquisition unit includes an electrode probe and a signal processor. The electrode probe is disposed on the side wall of the flue of a coal-fired boiler and is in contact with the ash medium inside the flue. When the leakage detection device is working, the electrode probe and the ash medium form an equivalent resistance detection circuit. Each signal processor is electrically connected to the corresponding electrode probe to acquire the response signal of the corresponding equivalent resistance detection circuit and send the response signal to the detection unit. The detection unit determines whether a leak has occurred in the low-temperature economizer installed inside the flue based on the response signal. Compared with existing leakage detection devices, firstly, this invention, by placing the electrode probe on the side wall of the flue and in contact with the ash medium, utilizes the change in conductivity caused by the change in the water content of the ash medium for leakage detection. Compared with traditional detection methods based on temperature and humidity, this improves the sensitivity and accuracy of identifying early minor leaks in the low-temperature economizer. Secondly, by setting up multiple acquisition units to conduct distributed monitoring of different areas of the flue, the equivalent resistance changes of different areas can be obtained in real time. When a leak occurs in a local area, the leak area can be quickly determined based on the abnormal response signal of the corresponding acquisition unit, thereby improving the efficiency of leak location, reducing the scope of manual investigation, and reducing the risk of further corrosion of equipment and unit operation. Attached Figure Description

[0009] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the installation arrangement of a leak detection device in a flue according to an embodiment of the present invention; Figure 2 This is a schematic flowchart of a leakage detection method provided in an embodiment of the present invention; Figure 3 This is another schematic flowchart of the leakage detection method provided in this embodiment of the invention; Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0011] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0012] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0013] Figure 1 This is a schematic diagram of the installation arrangement of a leak detection device in a flue according to an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a leak detection device, comprising: a detection unit 10 and at least one acquisition unit; wherein, Each acquisition unit includes an electrode probe 20 and a signal processor 30; the electrode probe 20 is set on the side wall 40 of the flue of the coal-fired boiler and is in contact with the ash medium 60 in the flue; when the leakage detection device is working, the electrode probe 20 and the ash medium 60 form an equivalent resistance detection circuit.

[0014] Specifically, the detection unit 10 can be a programmable logic controller (PLC), microcontroller unit (MCU), or other device with data processing capabilities. Each acquisition unit includes an electrode probe 20 and a signal processor 30. The electrode probe 20 is positioned on the side wall 40 of the flue, ensuring stable contact between the electrode probe 20 and the ash accumulation medium 60. This avoids the electrode probe 20 being directly installed at the bottom of the flue and thus protected from the effects of ash accumulation, flue gas scouring, or mechanical wear, thereby improving the operational stability and service life of the electrode probe 20. Furthermore, when the low-temperature economizer 50 leaks, the leaked liquid enters the flue and wets the ash accumulation medium 60, increasing its moisture content and conductivity. This causes a change in the resistance of the equivalent resistance detection circuit formed by the electrode probe 20 and the ash accumulation medium 60.

[0015] Each signal processor 30 is electrically connected to the corresponding electrode probe 20 to acquire the response signal of the corresponding equivalent resistance detection circuit and send the response signal to the detection unit 10.

[0016] Specifically, each signal processor 30 is electrically connected to the corresponding electrode probe 20 to receive the response signal generated by the equivalent resistance detection circuit where the electrode probe 20 is located; the signal processor 30 acquires, amplifies and standardizes the response signal to improve the stability and anti-interference capability of weak signal detection. The signal processor 30 sends the processed response signal to the detection unit 10 for leakage status analysis and judgment. Furthermore, by configuring a corresponding signal processor 30 at each electrode probe 20, independent acquisition and transmission of signals from each monitoring area can be achieved, reducing signal interference between different measuring points and improving the stability of response signal acquisition and the accuracy of detection results.

[0017] The detection unit 10 is used to determine whether the low-temperature economizer 50 installed inside the flue is leaking based on the response signal.

[0018] Specifically, the detection unit 10 receives response signals from each signal processor 30 and analyzes parameters such as the resistance value, trend of change, rate of change, and duration of abnormality corresponding to the response signals to determine whether there is a risk of leakage in the current monitoring area, and further determines whether the cryogenic economizer 50 has already leaked. In this way, real-time monitoring and early warning of the leakage status of the cryogenic economizer 50 can be achieved, improving the accuracy and reliability of leakage detection. Optionally, the flue is divided into at least two sections, with at least one data acquisition unit installed in each section.

[0019] Specifically, the flue is divided into at least two sections along the flue gas flow direction, such as a high-temperature section, a medium-temperature section, and a low-temperature section. At least one data acquisition unit is installed in each section to independently monitor the ash accumulation status in different areas. When the data acquisition unit corresponding to a certain flue section detects an abnormal decrease in the resistivity of the ash accumulation medium, the detection unit 10 can preliminarily determine the leak location based on the area where the abnormal measurement point is located. This enables rapid location of the leak area, reduces the scope of investigation for maintenance personnel, and improves leak detection efficiency and equipment maintenance efficiency.

[0020] Optionally, the signal processor is a resistance signal transmitter.

[0021] In this embodiment, the leak detection device is designed to include a detection unit and at least one acquisition unit. Each acquisition unit includes an electrode probe and a signal processor. The electrode probe is disposed on the side wall of the flue of the coal-fired boiler and is in contact with the ash medium inside the flue. When the leak detection device is working, the electrode probe and the ash medium form an equivalent resistance detection circuit. Each signal processor is electrically connected to the corresponding electrode probe to acquire the response signal of the corresponding equivalent resistance detection circuit and send the response signal to the detection unit. The detection unit determines whether the low-temperature economizer installed inside the flue has leaked based on the response signal. Compared with existing leak detection devices, firstly, this invention, by placing the electrode probe on the side wall of the flue and in contact with the ash medium, utilizes the change in conductivity caused by the change in the water content of the ash medium for leak detection. Compared with traditional detection methods based on temperature and humidity, this improves the sensitivity and accuracy of identifying early minor leaks in the low-temperature economizer. Secondly, by setting up multiple acquisition units to conduct distributed monitoring of different areas of the flue, the equivalent resistance changes of different areas can be obtained in real time. When a leak occurs in a local area, the leak area can be quickly determined based on the abnormal response signal of the corresponding acquisition unit, thereby improving the efficiency of leak location, reducing the scope of manual investigation, and reducing the risk of further corrosion of equipment and unit operation.

[0022] Figure 2 This is a schematic flowchart of a leakage detection method provided in an embodiment of the present invention. The leakage detection method provided in this embodiment is applicable to scenarios involving leakage detection of low-temperature economizers in the flue gas ducts of coal-fired boilers. This leakage detection method can be executed by the detection unit of the leakage detection device provided in this embodiment, and this detection unit can be implemented using software and / or hardware. In a specific embodiment, this detection unit can be integrated into an electronic device. See also... Figure 2 The leakage detection method in this embodiment may include the following steps: Step 201: For any response signal sent by a signal processor, determine the equivalent resistance value of the ash accumulation medium based on the response signal.

[0023] The response signal includes voltage and current signals.

[0024] The response signal refers to the electrical signal generated by the equivalent resistance detection circuit, used to characterize the change in the conductivity state of the ash-accumulated medium. This includes voltage signals, current signals, resistance parameter signals, or other data parameters converted from the above signals. The ash-accumulated medium refers to the medium layer formed by dust, fly ash, or particulate matter deposited inside the flue of a coal-fired boiler, which has different conductivity properties under different moisture contents. The equivalent resistance value refers to the resistance parameter corresponding to the equivalent resistance detection circuit formed by the electrode probe and the ash-accumulated medium, used to characterize the conductivity of the ash-accumulated medium. The equivalent resistance detection circuit refers to the electrical detection circuit formed by the electrode probe, the ash-accumulated medium, and the corresponding conductive path; the overall conductivity characteristic of the detection circuit can be equivalent to a single resistance value.

[0025] Specifically, during the leak detection process, each signal processor collects the response signal generated by the equivalent resistance detection circuit where the corresponding electrode probe is located, and sends the response signal to the detection unit. The detection unit calculates the equivalent resistance value (equivalent resistance value = voltage / current) corresponding to the current ash accumulation medium based on the voltage, current or other electrical parameters corresponding to the response signal, thereby providing a basis for subsequent judgment of the leakage status of the low-temperature economizer.

[0026] Step 202: Based on the equivalent resistance value, determine whether the low-temperature economizer installed inside the flue is leaking at the electrode probe location corresponding to the signal processor.

[0027] A low-temperature economizer is a heat exchange device installed in the flue at the tail end of a coal-fired boiler. It is used to heat the feedwater using the waste heat from the boiler exhaust, thereby improving the boiler's thermal efficiency.

[0028] Specifically, the detection unit determines whether the cryogenic economizer in the corresponding electrode probe area has leaked based on the change in equivalent resistance value, and can further locate the leak area. More specifically, when the cryogenic economizer is operating normally, the ash-accumulated medium is usually kept in a relatively dry state, and its equivalent resistance value remains in a high range. When the cryogenic economizer leaks, the leaking liquid enters the flue and wets the ash-accumulated medium in the corresponding area, which enhances the conductivity of the ash-accumulated medium, thereby causing the equivalent resistance value to decrease. Therefore, by analyzing parameters such as the magnitude, trend, and duration of the equivalent resistance value, it can be determined whether the cryogenic economizer in the corresponding monitoring area has leaked.

[0029] In this embodiment, the equivalent resistance value of the ash accumulation medium is obtained based on the response signals sent by each signal processor, and the leakage at the corresponding monitoring location of the low-temperature economizer is determined based on the equivalent resistance value. This enables rapid identification and online monitoring of the leakage status, improves the real-time performance and accuracy of the detection, and helps to locate the leakage location, thereby improving maintenance efficiency and system stability.

[0030] Figure 3 This is another schematic flowchart of the leakage detection method provided in this embodiment of the invention, as shown below. Figure 2 As shown, the leakage detection method in this embodiment may include: Step 301: For any response signal sent by a signal processor, determine the equivalent resistance value of the ash accumulation medium based on the response signal.

[0031] Step 302: Based on the equivalent resistance value, determine whether there is a leakage risk at the electrode probe location corresponding to the signal processor in the low-temperature economizer.

[0032] Leakage risk refers to the potential leakage state of a cryogenic economizer at a certain electrode probe setting location. This state does not directly indicate that a leak has occurred, but rather is an early warning judgment based on the characteristics of the change in equivalent resistance value to indicate the possibility of leakage. It includes primary leakage risk and secondary leakage risk, where primary leakage risk corresponds to a milder abnormal change state and secondary leakage risk corresponds to a more severe abnormal change state.

[0033] Specifically, the changes in the equivalent resistance of the ash-accumulated medium at each electrode probe location are analyzed to determine whether the location is at risk of leakage.

[0034] Optionally, based on the equivalent resistance value, it is determined whether there is a leakage risk at the electrode probe setting position corresponding to the signal processor of the low-temperature economizer, including: if the equivalent resistance value is less than the first threshold and greater than or equal to the second threshold, and the duration is greater than or equal to the first duration, then it is determined that there is a first-level leakage risk at the electrode probe setting position corresponding to the signal processor of the low-temperature economizer; if the equivalent resistance value is less than the second threshold and greater than or equal to the third threshold, then it is determined that there is a second-level leakage risk at the electrode probe setting position corresponding to the signal processor of the low-temperature economizer.

[0035] The first threshold is a pre-set resistance boundary value, such as 107 Ω·cm, used to distinguish between normal conditions and Level 1 leakage risk. The second threshold is a pre-set resistance boundary value, such as 105 Ω·cm, used to distinguish between Level 1 and Level 2 leakage risk. The third threshold is a pre-set resistance boundary value, such as 104 Ω·cm, used to limit the equivalent resistance value corresponding to Level 2 leakage risk. The first duration is a pre-set duration threshold, such as 10 minutes, used to limit the length of time the equivalent resistance value remains between the first and second thresholds to avoid misjudgment due to instantaneous fluctuations. Level 1 leakage risk refers to a leakage risk state where the conductivity of accumulated ash begins to change and early wetting occurs. Level 2 leakage risk refers to a leakage risk state where the degree of ash wetting further increases and leakage characteristics become more obvious.

[0036] Specifically, the equivalent resistance of the ash-accumulated medium at each electrode probe location is monitored in real time to classify the leakage risk of the low-temperature economizer. When the equivalent resistance is below the first threshold but greater than or equal to the second threshold, and the duration reaches the first time period, it indicates that the conductivity of the ash-accumulated medium in the corresponding area has increased, but the degree of wetting is relatively low; therefore, a level one leakage risk is identified at this location. When the equivalent resistance further decreases, falling below the second threshold but greater than or equal to the third threshold, it indicates that the degree of ash wetting has further worsened, and the leakage characteristics are more obvious; therefore, a level two leakage risk is identified at this location.

[0037] For example, assume the first threshold is 107 Ω·cm, the second threshold is 105 Ω·cm, the third threshold is 104 Ω·cm, and the first duration is 10 minutes. When the equivalent resistance value at a certain electrode probe location is continuously decreasing, it indicates that the conductivity of the local ash accumulation is beginning to change. When the equivalent resistance value is less than 107 Ω·cm and greater than or equal to 105 Ω·cm (i.e., the equivalent resistance value is in the range [105 Ω·cm, 107 Ω·cm)), and this state lasts for 10 minutes, it indicates that the ash accumulation in the corresponding area has shown early wetting, thus determining that there is a first-level leakage risk in the low-temperature economizer at the electrode probe location. When the equivalent resistance value further decreases, becoming less than 105 Ω·cm and greater than or equal to 104 Ω·cm (i.e., the equivalent resistance value is in the range [104 Ω·cm, 105 Ω·cm)), it indicates that the degree of ash wetting is significantly enhanced, thus determining that there is a second-level leakage risk in the low-temperature economizer at the electrode probe location.

[0038] Step 303: In the event of leakage risk, determine the rate of change of resistance based on the equivalent resistance value.

[0039] The rate of change of resistance refers to the magnitude of change in the equivalent resistance value per unit time, and is used to characterize how quickly the equivalent resistance value changes over time.

[0040] Specifically, when a monitoring location has been determined to be at risk of leakage, the change of the equivalent resistance value of that monitoring location over time is analyzed and calculated to determine the rate of change of resistance.

[0041] Step 304: If the resistance change rate is greater than or equal to the preset change rate, the equivalent resistance value is less than the fourth threshold, and the duration is greater than or equal to the second duration, then it is determined that the low-temperature economizer has leaked at the electrode probe setting position corresponding to the signal processor.

[0042] The preset rate of change refers to a pre-set threshold for the rate of resistance change, used to distinguish between normal fluctuations and abnormally rapid changes. The fourth threshold refers to a pre-set fourth resistance boundary value, used to further limit the upper limit of the equivalent resistance value corresponding to the leakage state. The second duration refers to a pre-set duration threshold, such as 60 minutes, used to limit the duration for which the rate of resistance change and the equivalent resistance value simultaneously meet the conditions, in order to avoid misjudgment caused by instantaneous interference.

[0043] Specifically, when the resistance change rate is greater than or equal to the preset change rate, the equivalent resistance value is less than the fourth threshold, and the duration is greater than or equal to the second duration, it indicates that the equivalent resistance value has decreased rapidly in a short period of time, and the local dust accumulation medium has entered the lower resistance range and has been maintained in this range for a certain period of time. Therefore, it is determined that a leak has occurred at this location.

[0044] For example, suppose the fourth threshold is 103 Ω·cm and the second duration is 60 minutes. When the equivalent resistance value at a certain electrode probe setting location is detected to drop rapidly to below 103 Ω·cm in a short period of time, and the state lasts for 60 minutes, it indicates that the ash accumulation in the corresponding area has formed a stable conductive path. Therefore, it is determined that the low-temperature economizer is leaking at the electrode probe setting location.

[0045] Step 305: After determining that a leak has occurred in the low-temperature economizer at the electrode probe location corresponding to the signal processor, a prompt message is sent. The prompt message is used to remind the user to replace or repair the low-temperature economizer.

[0046] Specifically, after determining that a leak has occurred in the low-temperature economizer at the electrode probe location corresponding to the signal processor, the detection unit generates and sends a prompt message to the user to remind the user that the low-temperature economizer has malfunctioned and needs to be replaced or repaired, thereby avoiding impact on the boiler's heat exchange efficiency and reduced operational stability.

[0047] Optionally, the alert message can also be used to indicate the location of a leak in the cryogenic economizer.

[0048] Specifically, the alert message can also include the exact location of the leak, allowing users to quickly pinpoint the leak and perform targeted repairs.

[0049] In this embodiment, the equivalent resistance value of the ash-accumulating medium is obtained based on the response signals sent by each signal processor. Leakage risk is then assessed based on this equivalent resistance value. Furthermore, the leakage status is further confirmed by combining the resistance change rate, threshold conditions, and duration, thereby improving the accuracy and reliability of leakage detection. Once a leakage is confirmed, a notification message is sent to remind the user to perform repairs or replacement, enabling timely alarm and handling of leakage anomalies. This helps improve the real-time performance of detection, reduce the probability of false alarms, and ensure the safe and stable operation of the low-temperature economizer and boiler system.

[0050] The following is for reference. Figure 4 It shows a schematic diagram of the structure of a computer system 400 suitable for implementing an electronic device according to embodiments of the present invention. Figure 4 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0051] like Figure 4 As shown, the computer system 400 includes a central processing unit (CPU) 401, which can perform various appropriate actions and processes based on programs stored in read-only memory (ROM) 402 or programs loaded from storage section 408 into random access memory (RAM) 403. The RAM 403 also stores various programs and data required for the operation of the computer system 400. The CPU 401, ROM 402, and RAM 403 are interconnected via a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0052] The following components are connected to I / O interface 405: input section 406 including keyboard, mouse, etc.; output section 407 including cathode ray tube, liquid crystal display, etc., and speakers, etc.; storage section 408 including hard disk, etc.; and communication section 409 including network interface card, such as modem, etc. Communication section 409 performs communication processing via a network such as the Internet. Drive 410 is also connected to I / O interface 405 as needed. Removable media 411, such as disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 410 as needed so that computer programs read from them can be installed into storage section 408 as needed.

[0053] In particular, according to the embodiments disclosed in this invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 409, and / or installed from removable medium 411. When the computer program is executed by central processing unit (CPU) 401, it performs the functions defined above in the system of this invention.

[0054] It should be noted that the computer-readable medium shown in this invention can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical fiber, a portable compact disk read-only memory, an optical storage device, a magnetic storage device, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, etc., or any suitable combination thereof.

[0055] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0056] In another aspect, the present invention also provides a computer-readable medium, which may be included in the device described in the above embodiments; or it may exist alone and not assembled into the device.

[0057] This invention also provides a computer program product, including a computer program that, when executed by a processor, implements the leakage detection method provided in any embodiment of this invention.

[0058] In the implementation of a computer program product, computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages ​​as well as conventional procedural programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including local area networks (LANs) or wide area networks (WANs), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0059] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0060] It should be noted that the collection, use, storage, sharing, and transfer of user personal information involved in the technical solution of this invention all comply with the provisions of relevant laws and regulations, and require notification to the user and obtaining the user's consent or authorization. Where applicable, user personal information has undergone de-identification and / or anonymization and / or encryption technical processing. In addition, a corresponding operation entry is provided for the user to choose to agree to or reject the automated decision result; if the user chooses to reject, the process proceeds to the expert decision-making process.

[0061] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A leak detection device, characterized in that, include: A detection unit and at least one acquisition unit; wherein, Each acquisition unit includes an electrode probe and a signal processor; the electrode probe is installed on the side wall of the flue of the coal-fired boiler and is in contact with the ash medium inside the flue; when the leakage detection device is working, the electrode probe and the ash medium form an equivalent resistance detection circuit; Each signal processor is electrically connected to its corresponding electrode probe to acquire the response signal of the corresponding equivalent resistance detection circuit and send the response signal to the detection unit. The detection unit is used to determine whether the low-temperature economizer installed inside the flue is leaking based on the response signal.

2. The leakage detection device according to claim 1, characterized in that, The flue is divided into at least two sections, and each section is equipped with at least one of the aforementioned acquisition units.

3. The leakage detection device according to claim 1, characterized in that, The signal processor is a resistance signal transmitter.

4. A leak detection system, characterized in that, Includes the leak detection device as described in any one of claims 1-3.

5. A leak detection method, characterized in that, The detection unit applied to the leakage detection device as described in any one of claims 1-3 includes: For any response signal sent by a signal processor, the equivalent resistance value of the ash-accumulating medium is determined based on the response signal. Based on the equivalent resistance value, determine whether the low-temperature economizer installed inside the flue is leaking at the location of the electrode probe corresponding to the signal processor.

6. The method according to claim 5, characterized in that, The response signal includes a voltage signal and a current signal.

7. The method according to claim 5, characterized in that, The step of determining whether the low-temperature economizer installed inside the flue gas duct leaks at the electrode probe location corresponding to the signal processor based on the equivalent resistance value includes: Based on the equivalent resistance value, determine whether there is a risk of leakage in the cryogenic economizer at the electrode probe location corresponding to the signal processor; In cases where leakage risk exists, the resistance change rate is determined based on the equivalent resistance value. If the resistance change rate is greater than or equal to the preset change rate, and the equivalent resistance value is less than the fourth threshold, and the duration is greater than or equal to the second duration, then it is determined that the cryogenic economizer leaks at the electrode probe setting position corresponding to the signal processor.

8. The method according to claim 7, characterized in that, The step of determining whether there is a leakage risk of the cryogenic economizer at the electrode probe location corresponding to the signal processor based on the equivalent resistance value includes: If the equivalent resistance value is less than the first threshold and greater than or equal to the second threshold, and the duration is greater than or equal to the first duration, then it is determined that the cryogenic economizer has a first-level leakage risk at the electrode probe setting position corresponding to the signal processor. If the equivalent resistance value is less than the second threshold and greater than or equal to the third threshold, then it is determined that the cryogenic economizer has a secondary leakage risk at the electrode probe setting position corresponding to the signal processor.

9. The method according to claim 5, characterized in that, The method further includes: After determining that the low-temperature economizer has leaked at the electrode probe location corresponding to the signal processor, a prompt message is sent, which is used to remind the user to replace or repair the low-temperature economizer.

10. The method according to claim 9, characterized in that, The notification message is also used to indicate the location of the leak in the cryogenic economizer.

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