Composite leak detection method for improved communication pipe based on blast furnace cooling wall

Abstract

This invention discloses a leak detection method based on an improved connecting pipe for blast furnace cooling walls. The method includes the following steps: installing an improved connecting pipe between two adjacent minimum water channel units. The improved connecting pipe is arranged in a transverse U-shape, and a flow diversion and interception mechanism is installed on the straight section at the bottom of the transverse U-shape. The flow diversion and interception mechanism includes a propulsion valve, with an upper connector and a lower connector respectively located upstream and downstream of the propulsion valve; briefly interrupting water flow by closing the upstream and downstream propulsion valves corresponding to the minimum water channel unit to be tested, and connecting the upstream upper connector and the downstream lower connector corresponding to the minimum water channel unit to be tested to restore water flow; performing cooling water leak detection on the minimum water channel unit to be tested, and performing online leak identification. This invention not only allows for online operation but also accurately identifies leaks at the minimum cooling unit, and is suitable for use alone or in combination with methods such as flow difference method, visual head assessment method, and high-pressure water pressure test method.

Description

Technical Field

[0001] This invention belongs to the field of blast furnace technology, specifically referring to a leak detection method based on an improved connecting pipe of the blast furnace cooling wall. Background Technology

[0002] In the later stages of blast furnace service, the cooling system begins to experience cooling wall damage, leading to increased water leakage. This manifests as water flowing from the tuyeres and tapholes, and the hydrogen concentration inside the furnace frequently exceeding the standard range (3.00~5.00%). Large areas of the leaking cooling walls may become blocked, and even blast furnace shutdowns can cause abnormal furnace conditions, seriously jeopardizing the safe production of the blast furnace. Therefore, accurately detecting the location of water leakage in the cooling walls can provide a reliable basis for taking corrective measures.

[0003] like Figure 1 As shown in the diagram, the structure of the cooling water channel of the blast furnace cooling wall in the prior art is such that the ultimate goal in production is to accurately determine whether the smallest water channel unit shown in the diagram is leaking in order to take targeted measures to deal with it and to control the damage of cooling wall leakage to the blast furnace to the minimum.

[0004] Existing technologies include: ① visual judgment of water head; ② high-pressure water pressure test; ③ gas detection method; ④ electrical conductivity method; ⑤ flow difference method.

[0005] ① Visual assessment of water head: This method is the most widely used and relatively reliable. By adjusting the water inlet flow rate and observing the water flow at the outlet, a manual technical experience can be used to determine whether there is a leak. However, this method is only applicable to open-loop industrial water cooling systems and not to closed-loop soft water cooling systems. Furthermore, it cannot determine which floor the leak is located on, which is a significant limitation. ② High-pressure water pressure testing: This is currently the most widely used method for checking leaks and locating leaks. Common methods are cumbersome and labor-intensive. Typically, a hose system with a pressure gauge is designed. During blast furnace shutdown, this system supplies high-pressure water to the cooling wall inlet pipe. The outlet valve is then closed, and the pressure gauge is observed. A significant drop in pressure indicates a leak in that section of the cooling wall. The detection method usually involves narrowing down the area step by step, requiring three or more steps to pinpoint the exact leak location. This method is labor-intensive and complex. Furthermore, water gas can be generated inside the high-pressure boiler during shutdown maintenance, posing a safety hazard. If there are multiple leaks, there is simply not enough time to address them during maintenance, resulting in numerous drawbacks.

[0006] ③ Gas detection method: The main principle of this method is to collect dissolved gases in cooling water. The presence of coal gas was detected to determine if a leak was present. Manually collecting gas at the water outlet using a gas sampling bag proved effective; however, its application to cooling walls has not been reported, as this method is difficult to operate and its reliability is questionable.

[0007] ④ Conductivity method: The conductivity method is one of the above-mentioned methods for detecting coal gas. It involves adding an element to the gas sampling device. Adding an air chamber, once the gas in the chamber increases to a certain level, will detach the water from the sensor, thus triggering an alarm. However, this method has a high probability of false alarms and is generally only used for monitoring leaks in small air vents.

[0008] ⑤ Flow difference method: This is the most accurate method and it is also simple to operate, but... The investment is relatively large. Generally, fixed electromagnetic flow meters are installed on the main pipe, or at the inlet and outlet of each cooling channel. The difference in flow rate can indicate that there is a leak. The method is simple, but it is difficult to install flow meters in every channel. Therefore, it is still impossible to determine which layer of the cooling channel is leaking.

[0009] In summary, the above-mentioned blast furnace leakage detection method has the following technical problems: First, the current blast furnace cooling channels are all connected in multiple series. Existing methods can only preliminarily determine which channel it is in, but cannot accurately determine which specific layer of the channel it is in. Without accurately determining the specific location, there is no way to take measures to fix the leak. Second, existing methods can only be used during blast furnace maintenance and cannot be used online. Although the water head visual judgment method can be used online, this method cannot be applied to soft water closed systems and therefore cannot be used to detect leaks online, thus making it impossible to implement online leak control and repair measures. Third, the above-mentioned testing methods are cumbersome to operate on-site, the testing systems are complex, the labor intensity is high, and there are safety risks.

[0010] Fourth, all existing testing methods require the blast furnace cooling wall connecting pipes to be inspected before the cooling channel testing can be carried out. Summary of the Invention

[0011] To address the shortcomings of existing technologies, this invention proposes a leak detection method based on an improved connecting pipe for blast furnace cooling walls. This method can operate both online and during shutdown, and can directly detect whether a specific smallest water channel unit in the cooling channel is leaking. This overcomes the limitation of current detection methods, which can only be applied to different areas but cannot pinpoint the leak to a specific smallest water channel unit.

[0012] To achieve the above objectives, this invention designs a leak detection method based on an improved connecting pipe of a blast furnace cooling wall, characterized by the following steps: S1) An improved connecting pipe is installed between two adjacent minimum water channel units. The improved connecting pipe is arranged in a transverse U-shape, and a diversion and interception control mechanism is installed on the straight section of the transverse U-shape. The diversion and interception control mechanism includes a propulsion valve set in the middle of the channel for cutting off or connecting the channel. The propulsion valve is provided with an upper connector and a lower connector at its upstream and downstream ends, respectively. S2) Based on the actual situation on site, analyze the smallest water channel unit to be tested in the cooling water pipe, cut off the water supply for a short time, close the push valve of the upstream improved connecting pipe corresponding to the smallest water channel unit to be tested and the push valve of the corresponding downstream improved connecting pipe respectively, connect the upper joint of the upstream improved connecting pipe corresponding to the smallest water channel unit to be tested and the lower joint of the corresponding downstream improved connecting pipe, and restore the water supply. S3) Perform cooling water leak detection on the minimum water channel unit to be tested. The leak detection inlet is the lower connector of the upstream improved connecting pipe corresponding to the minimum water channel unit to be tested, and the leak detection outlet is the upper connector of the downstream improved connecting pipe corresponding to the minimum water channel unit to be tested. Leak detection methods include one or more of the following: flow difference method, high-pressure water pressure test method, and visual judgment method of water head; S4) Upload the leak detection results of the smallest water channel unit to be tested to the auxiliary real-time leak detection analysis system for online leak identification, and implement online leak control and treatment.

[0013] Furthermore, in S1), the improved connecting pipe is connected to the upper and lower minimum water channel units via flanges.

[0014] Furthermore, in S2), the water cut-off time is set to 2-3 minutes.

[0015] Furthermore, in S2), the upper connector of the upstream improved connecting pipe corresponding to the minimum water channel unit and the lower connector of the corresponding downstream improved connecting pipe are connected by an auxiliary short pipe; the auxiliary short pipe includes a short hose, and the two ends of the short hose are respectively provided with an upper short connector and a lower short connector that match the upper connector and the lower connector.

[0016] Furthermore, in S2), the upper connector and the lower connector are respectively an upper internal thread connector and a lower internal thread connector; the upper short connector and the lower short connector are respectively an upper short external thread connector and a lower short external thread connector.

[0017] Further, in S3), the detection steps of the flow difference method include: installing a first flow meter at the lower joint of the upstream improved connecting pipe corresponding to the minimum water channel unit to be detected, and installing a first shut-off valve upstream of the first flow meter; installing a second flow meter at the upper joint of the downstream improved connecting pipe corresponding to the minimum water channel unit to be detected, and setting up a temporary water tank downstream of the second flow meter; and determining whether the minimum water channel unit to be detected is leaking based on the first flow count value and the second flow count value.

[0018] Furthermore, in S3), the detection steps of the high-pressure water pressure test method include: installing a first shut-off valve upstream of the lower connector of the upstream improved connecting pipe corresponding to the minimum water channel unit to be tested, and installing a pressure gauge downstream of the first shut-off valve; installing a second shut-off valve downstream of the upper connector of the downstream improved connecting pipe corresponding to the minimum water channel unit to be tested; and setting up a temporary water tank downstream of the second shut-off valve; and determining whether the minimum water channel unit to be tested is leaking based on the change in the pressure count value.

[0019] Furthermore, in S3), the detection steps of the visual head judgment method include: installing a first shut-off valve upstream of the lower connector of the upstream improved connecting pipe corresponding to the minimum water channel unit to be tested, and setting an auxiliary return water mechanism downstream of the upper connector of the downstream improved connecting pipe corresponding to the minimum water channel unit to be tested; judging whether the minimum water channel unit to be tested is leaking based on the outlet head status of the auxiliary return water mechanism.

[0020] Furthermore, in S3), the flow difference method, high-pressure water pressure test method, and water head visual judgment method are each applied individually to cooling water leak detection, for single-point analysis or simultaneous multi-point analysis.

[0021] Furthermore, in S3), the flow difference method and the visual judgment method of water head are combined and applied to the cooling water leak detection, and the high-pressure water pressure test method is used to verify the leak detection conclusion.

[0022] The advantages of this invention are: 1. Based on the existing technology, the present invention improves the U-shaped connecting pipe by installing a diversion and interception mechanism on the lower straight section of the improved connecting pipe. The upstream and downstream diversion and interception mechanisms achieve two purposes simultaneously: one is to maintain the continuous water supply for cooling other areas of the cooling wall, and the other is to detect leaks in the smallest cooling unit to be tested. 2. This invention enables simultaneous leak detection of cooling water in one or more smallest water channel units of the blast furnace cooling wall, even after a short-term online water outage, while maintaining continuous water supply to other areas of the cooling wall. This can be achieved by using the flow difference method, visual head assessment method, or high-pressure water pressure method individually, or in combination. This provides more diagnostic criteria and improves the accuracy of leak detection and identification. Furthermore, it allows return water to enter the original system without generating external drainage, losing soft water, or impacting the environment. This invention relates to an improved leak detection method for the connecting pipes of blast furnace cooling walls. It can not only operate online but also accurately locate leaks to the smallest cooling unit. It is applicable to the use of flow difference method, water head visual judgment method, high pressure water pressure test method, etc., alone or in combination, which improves the accuracy of leak detection and leak location operations. It has a wide range of applications and high accuracy. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the cooling water channel of the blast furnace cooling wall in the prior art; Figure 2 This is a flowchart of the present invention; Figure 3 This is a schematic diagram of the blast furnace cooling wall structure based on the installation of an improved connecting pipe in this invention; Figure 4 for Figure 3 Simplified structural diagram of the diversion and interception mechanism; Figure 5 This is a simplified structural diagram of the real-time leak detection system based on the flow difference method in this invention. Figure 6 This is a simplified structural diagram of the real-time leak detection system using the high-pressure water pressure testing method in this invention. Figure 7 This is a simplified structural diagram of the real-time leak detection system based on the visual head assessment method in this invention. In the picture: Minimum water channel unit 1, improved connecting pipe 2, diversion and interception mechanism 3, auxiliary short pipe 4, first flow meter 5-1, second flow meter 5-2, first shut-off valve 6-1, second shut-off valve 6-2, pressure gauge 7, auxiliary return water mechanism 8, auxiliary leak detection real-time analysis system 9; The diversion and interception mechanism 3 includes: a propulsion valve 3-1, an upper connector 3-2, and a lower connector 3-3; The auxiliary shorting pipe 4 includes: shorting hose 4-1, upper shorting connector 4-2, and lower shorting connector 4-3; The auxiliary water return mechanism 8 includes: a water return hose 8-1, an upper water return connector 8-2, and a temporary water tank 8-3. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 2 As shown, this invention designs a leak detection method based on an improved connecting pipe of a blast furnace cooling wall, comprising the following steps: S1) An improved connecting pipe 2 is installed between two adjacent minimum water channel units 1. The improved connecting pipe 2 is arranged in a transverse U-shape, and a diversion and interception mechanism 3 is installed on the straight section of the transverse U-shape. The diversion and interception mechanism 3 includes a propulsion valve 3-1 set in the middle of the channel for cutting off or connecting the channel. An upper connector 3-2 and a lower connector 3-3 are respectively set at the upstream and downstream of the propulsion valve 3-1.

[0026] like Figure 3 The diagram shown is a schematic of a blast furnace cooling wall structure based on an improved connecting pipe; as shown... Figure 4 As shown, Figure 3A simplified structural diagram of the diversion and interception mechanism in the system.

[0027] Specifically, during blast furnace overhaul, an improved connecting pipe 2 is installed between the two adjacent smallest water channel units 1; or during the later stages of blast furnace service, the old connecting pipes in key parts of the blast furnace are replaced with improved connecting pipes 2 during maintenance.

[0028] Specifically, the improved connecting pipe 2 is connected to the minimum water channel unit 1 of the upper and lower layers via flanges.

[0029] The push valve 3-1 is a slide gate valve or a plunger valve.

[0030] S2) Based on the actual situation on site, analyze the smallest water channel unit 1 to be tested in the cooling water pipe, cut off the water supply for a short time, close the push valve 3-1 of the upstream improved connecting pipe 2 corresponding to the smallest water channel unit 1 to be tested and the push valve 3-1 of the corresponding downstream improved connecting pipe 2 respectively, connect the upper connector 3-2 of the upstream improved connecting pipe 2 corresponding to the smallest water channel unit 1 to be tested and the lower connector 3-3 of the corresponding downstream improved connecting pipe 2, and restore the water supply.

[0031] Specifically, the water outage time is set to 2-3 minutes.

[0032] Specifically, the upper connector 3-2 of the upstream improved connecting pipe 2 corresponding to the minimum water channel unit 1 and the lower connector 3-3 of the corresponding downstream improved connecting pipe 2 are connected by an auxiliary short pipe 4 to maintain water supply.

[0033] The auxiliary short pipe 4 includes a short hose 4-1, and the two ends of the short hose 4-1 are respectively provided with an upper short connector 4-2 and a lower short connector 4-3 that match the upper connector 3-2 and the lower connector 3-3.

[0034] The length of the short-connector hose 4-1 is determined according to site requirements.

[0035] Preferably, the upper connector 3-2 and the lower connector 3-3 are respectively an upper internal thread connector and a lower internal thread connector; the upper short connector 4-2 and the lower short connector 4-3 are respectively an upper short external thread connector and a lower short external thread connector.

[0036] S3) Perform cooling water leak detection on the minimum water channel unit 1 to be tested. The leak detection inlet is the lower connector 3-3 of the upstream improved connecting pipe 2 corresponding to the minimum water channel unit 1 to be tested, and the leak detection outlet is the upper connector 3-2 of the downstream improved connecting pipe 2 corresponding to the minimum water channel unit 1 to be tested.

[0037] Leak detection methods include one or more of the following: flow difference method, high-pressure water pressure test method, and visual judgment method of water head.

[0038] The detection steps of the flow difference method include: installing a first flow meter 5-1 on the lower connector 3-3 of the upstream improved connecting pipe 2 corresponding to the minimum water channel unit 1 to be tested, and installing a first shut-off valve 6-1 upstream of the first flow meter 5-1; installing a second flow meter 5-2 on the upper connector 3-2 of the downstream improved connecting pipe 2 corresponding to the minimum water channel unit 1 to be tested, and setting a temporary water tank 8-3 downstream of the second flow meter 5-2; and determining whether the minimum water channel unit 1 to be tested is leaking based on the values ​​of the first flow meter 5-1 and the second flow meter 5-2.

[0039] like Figure 5 The diagram shown is a simplified structural diagram of a real-time leak detection system based on the flow difference method. Figure 5 In the process, atmospheric pressure water enters from the upstream of the first shut-off valve 6-1 and flows to the temporary water tank 8-3. If the value of the first flow meter 5-1 is the same as the value of the second flow meter 5-2, it means that the smallest water channel unit 1 to be tested is not leaking; if the value of the first flow meter 5-1 is greater than the value of the second flow meter 5-2, it means that the smallest water channel unit 1 to be tested is leaking.

[0040] Preferably, the first flow meter 5-1 and the second flow meter 5-2 are respectively equipped with flow signal transmitters for outputting flow signals.

[0041] The flow difference method is used for scientific quantitative real-time analysis of leak detection in blast furnace cooling walls. It can perform single-point analysis or multi-point simultaneous analysis, and quickly perform leak detection analysis.

[0042] The detection steps of the high-pressure water pressure test method include: installing a first shut-off valve 6-1 upstream of the lower connector 3-3 of the upstream improved connecting pipe 2 corresponding to the minimum water channel unit 1 to be tested, and installing a pressure gauge 7 downstream of the first shut-off valve 6-1; installing a second shut-off valve 6-2 downstream of the upper connector 3-2 of the downstream improved connecting pipe 2 corresponding to the minimum water channel unit 1 to be tested; and setting a temporary water tank 8-3 downstream of the second shut-off valve 6-2; and determining whether the minimum water channel unit 1 to be tested is leaking based on the change in the pressure gauge 7 value.

[0043] like Figure 6 The diagram shown is a simplified structural diagram of a real-time leak detection system using the high-pressure water pressure testing method. Figure 6 In the process, high-pressure water is introduced upstream of the first shut-off valve 6-1 and flows to the temporary water tank 8-3. If the pressure gauge 7 value drops slowly, it indicates that the smallest water channel unit 1 to be tested is not leaking; if the pressure gauge 7 value drops rapidly, it indicates that the smallest water channel unit 1 to be tested is leaking.

[0044] Preferably, the pressure gauge 7 is equipped with a pressure signal transmitter for outputting pressure signals.

[0045] The detection steps of the visual head assessment method include: installing a first shut-off valve 6-1 upstream of the lower connector 3-3 of the upstream improved connecting pipe 2 corresponding to the minimum water channel unit 1 to be tested; and setting an auxiliary return water mechanism 8 downstream of the upper connector 3-2 of the downstream improved connecting pipe 2 corresponding to the minimum water channel unit 1 to be tested. The auxiliary return water mechanism 8 includes a return water hose 8-1, one end of which is provided with an upper return water connector 8-2 that matches the upper connector 3-2, and a temporary water tank 8-3 is set downstream of the return water hose 8-1; and determining whether the minimum water channel unit 1 to be tested is leaking based on the state of the water outlet.

[0046] like Figure 7 The diagram shown is a simplified structural diagram of a real-time leak detection system based on the visual head assessment method. Figure 7 In the process, atmospheric pressure water enters from upstream of the first shut-off valve 6-1 and flows to the temporary water tank 8-3. The operator adjusts the water inflow and observes the changes in the water outlet head, judging from experience whether the tested water head is leaking. If there are no air bubbles in the water outlet head, it means that the smallest water channel unit 1 to be tested is not leaking; if there are air bubbles in the water outlet head, it means that the smallest water channel unit 1 to be tested is leaking.

[0047] Specifically, the length of the return water hose 8-1 is determined according to site requirements.

[0048] Preferably, the upper return water connector 8-2 is an upper return water external thread connector.

[0049] Preferably, the water in the temporary water tank 8-3 is returned to the blast furnace return water system.

[0050] Preferably, the flow difference method, high-pressure water pressure test method, and water head visual judgment method are each applied individually to cooling water leak detection for single-point analysis or simultaneous multi-point analysis.

[0051] In this embodiment, the flow difference method and the visual head judgment method are combined and applied to cooling water leak detection, obtaining multiple analytical bases at the same time, resulting in high accuracy of analytical conclusions.

[0052] Preferably, the high-pressure water pressure test method is used to verify the leak detection conclusions, thereby improving the accuracy of the leak detection analysis conclusions.

[0053] S4) Upload the leak detection results of the smallest water channel unit 1 to be tested to the auxiliary real-time leak detection analysis system 9 for online leak identification, and implement online leak control and treatment.

[0054] Preferably, the auxiliary leak detection real-time analysis system 9 includes a signal receiving device for receiving wireless signals and a terminal system for display and analysis.

[0055] This invention relates to an improved leak detection method for the connecting pipes of blast furnace cooling walls. It can not only operate online but also accurately locate leaks to the smallest cooling unit. It is applicable to the use of flow difference method, water head visual judgment method, high pressure water pressure test method, etc., alone or in combination, which improves the accuracy of leak detection and leak location operations. It has a wide range of applications and high accuracy.

[0056] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A leak detection method based on an improved connecting pipe of a blast furnace cooling wall, characterized in that, Includes the following steps: S1) An improved connecting pipe (2) is installed between two adjacent minimum water channel units (1). The improved connecting pipe (2) is arranged in a transverse U-shape, and a diversion control mechanism (3) is installed on the straight section of the transverse U-shape. The diversion control mechanism (3) includes a propulsion valve (3-1) set in the middle of the channel for cutting off or connecting the channel. The propulsion valve (3-1) is provided with an upper connector (3-2) and a lower connector (3-3) at its upstream and downstream ends, respectively. S2) Based on the actual situation on site, analyze the smallest water channel unit (1) to be tested in the cooling water pipe, cut off the water supply for a short time, close the push valve (3-1) of the upstream improved connecting pipe (2) corresponding to the smallest water channel unit (1) to be tested and the push valve (3-1) of the corresponding downstream improved connecting pipe (2) respectively, connect the upper connector (3-2) of the upstream improved connecting pipe (2) corresponding to the smallest water channel unit (1) to be tested and the lower connector (3-3) of the corresponding downstream improved connecting pipe (2) to restore the water supply; S3) Perform cooling water leak detection on the minimum water channel unit (1) to be tested. The leak detection inlet is the lower connector (3-3) of the upstream improved connecting pipe (2) corresponding to the minimum water channel unit (1) to be tested, and the leak detection outlet is the upper connector (3-2) of the downstream improved connecting pipe (2) corresponding to the minimum water channel unit (1) to be tested. Leak detection methods include one or more of the following: flow difference method, high-pressure water pressure test method, and visual judgment method of water head; S4) Upload the leak detection results of the smallest water channel unit (1) to be tested to the auxiliary real-time leak detection analysis system (9) for online leak identification, and implement online leak control and repair.

2. The leak detection method based on the improved connecting pipe of the blast furnace cooling wall according to claim 1, characterized in that: In S1), the improved connecting pipe (2) is connected to the upper and lower minimum water channel units (1) via flanges.

3. The leak detection method based on the improved connecting pipe of the blast furnace cooling wall according to claim 2, characterized in that: In S2), the water cut-off time is set to 2-3 minutes.

4. The leak detection method based on the improved connecting pipe of the blast furnace cooling wall according to claim 3, characterized in that: In S2), the upper connector (3-2) of the upstream improved connecting pipe (2) corresponding to the smallest water channel unit (1) is connected to the lower connector (3-3) of the corresponding downstream improved connecting pipe (2) through an auxiliary short pipe (4); the auxiliary short pipe (4) includes a short connecting hose (4-1), and the two ends of the short connecting hose (4-1) are respectively provided with an upper short connector (4-2) and a lower short connector (4-3) that match the upper connector (3-2) and the lower connector (3-3).

5. The leak detection method based on the improved connecting pipe of the blast furnace cooling wall according to claim 4, characterized in that: In S2), the upper connector (3-2) and the lower connector (3-3) are respectively an upper internal thread connector and a lower internal thread connector; the upper short connector (4-2) and the lower short connector (4-3) are respectively an upper short external thread connector and a lower short external thread connector.

6. The leak detection method based on the improved connecting pipe of the blast furnace cooling wall according to claim 1, characterized in that: In S3), the detection steps of the flow difference method include: installing a first flow meter (5-1) on the lower connector (3-3) of the upstream improved connecting pipe (2) corresponding to the minimum water channel unit (1) to be tested, and installing a first shut-off valve (6-1) upstream of the first flow meter (5-1); installing a second flow meter (5-2) on the upper connector (3-2) of the downstream improved connecting pipe (2) corresponding to the minimum water channel unit (1) to be tested, and setting a temporary water tank (8-3) downstream of the second flow meter (5-2); and determining whether the minimum water channel unit (1) to be tested is leaking based on the values ​​of the first flow meter (5-1) and the second flow meter (5-2).

7. The leak detection method based on the improved connecting pipe of the blast furnace cooling wall according to claim 6, characterized in that: In S3), the detection steps of the high-pressure water pressure test method include: installing a first shut-off valve (6-1) upstream of the lower connector (3-3) of the upstream improved connecting pipe (2) corresponding to the minimum water channel unit (1) to be tested, and installing a pressure gauge (7) downstream of the first shut-off valve (6-1), installing a second shut-off valve (6-2) downstream of the upper connector (3-2) of the downstream improved connecting pipe (2) corresponding to the minimum water channel unit (1) to be tested, and setting a temporary water tank (8-3) downstream of the second shut-off valve (6-2); judging whether the minimum water channel unit (1) to be tested is leaking based on the change in the pressure gauge (7).

8. The leak detection method based on the improved connecting pipe of the blast furnace cooling wall according to claim 7, characterized in that: In S3), the detection steps of the visual judgment method of water head include: installing a first shut-off valve (6-1) upstream of the lower connector (3-3) of the upstream improved connecting pipe (2) corresponding to the minimum water channel unit (1) to be tested, and setting an auxiliary return water mechanism (8) downstream of the upper connector (3-2) of the downstream improved connecting pipe (2) corresponding to the minimum water channel unit (1) to be tested; judging whether the minimum water channel unit (1) to be tested is leaking water based on the water head status of the auxiliary return water mechanism (8).

9. The leak detection method based on the improved connecting pipe of the blast furnace cooling wall according to claim 8, characterized in that: In S3), the flow difference method, high-pressure water pressure test method, and water head visual judgment method are applied individually to cooling water leak detection, for single-point analysis or simultaneous multi-point analysis.

10. The leak detection method based on the improved connecting pipe of the blast furnace cooling wall according to claim 8, characterized in that: In S3), the flow difference method and the water head visual judgment method are combined and applied to the cooling water leak detection, and the high-pressure water pressure test method is used to verify the leak detection conclusion.

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