Method for quickly searching for atmosphere damaged fault point of annealing furnace of continuous annealing line

Abstract

The invention belongs to the technical field of strip steel annealing, and relates to a method for quickly searching for a fault point where the atmosphere of a continuous annealing line annealing furnace is damaged, which comprises the following steps of: 1, arranging three sampling points, namely a negative pressure point, a positive pressure point and a manual sampling point, on pipelines on fans of a preheating section, a slow cooling section, a quick cooling section and a final cooling section of the annealing furnace; the positive and negative pressure points are communicated with a gas analyzer; wherein the manual sampling points for slow cooling, rapid cooling and final cooling are located under a heat exchanger on a heat exchange pipeline of the fan, and the negative pressure point and the positive pressure point are located at an air inlet and an air outlet of the fan on the fan pipeline respectively; the fan cooling systems of the slow cooling section, the rapid cooling section and the final cooling section of the annealing furnace adopt tubular water-cooling heat exchangers; and the fan heat exchange system at the preheating section of the annealing furnace adopts tubular flue gas heat exchange. According to the method, the fault point furnace section where the atmosphere in the annealing furnace is damaged can be quickly locked, so that targeted inspection is carried out, and the damage root of the protective atmosphere in the furnace can be quickly found.

Description

Technical Field

[0001] This invention belongs to the field of strip annealing technology, and particularly relates to a method for quickly locating fault points where the atmosphere of an annealing furnace in a continuous annealing line is disrupted. Background Technology

[0002] Continuous annealing, as opposed to bell-type annealing, involves the strip steel continuously passing through an annealing furnace without a seal. Two coils are connected end-to-end by welding, and the strip steel is directly coiled without stopping, ensuring a continuous flow of strip steel within the furnace. Continuous annealing units are a crucial component of modern cold-rolled strip steel production lines and have become the mainstay units for producing automotive steel, appliance steel, and other products.

[0003] The annealing furnace atmosphere uses a nitrogen-hydrogen mixture to ensure the strip steel is not oxidized under a slightly positive pressure. Typically, it uses 95% nitrogen and 5% hydrogen. When the oxygen content in the protective gas exceeds 20 ppm, the strip steel will undergo an oxidation reaction, which is difficult to reduce even with increased hydrogen injection. Factors affecting the oxidation-reduction of strip steel also include dew point. When the furnace dew point exceeds -20°C, the strip steel's oxidation resistance decreases, making its surface prone to yellowing. The main factor causing increased oxygen content in the furnace is the furnace's airtightness. Because the furnace is generally under positive pressure, it is difficult for outside air to enter. However, if the cooling fans and circulating fans experience airtightness problems in the negative pressure zone, outside air will enter the furnace, leading to excessive oxygen content. The main factors causing increased dew point in the furnace include the entry of circulating water from the cooling fans and closed-loop cooling water into the furnace.

[0004] Most domestic continuous annealing lines are equipped with cabinet-type gas analyzers. The analyzers analyze the protective gas in each section of the furnace to determine the hydrogen content, oxygen content, and dew point. Since continuous annealing furnaces are divided into many sections, the analysis process is carried out in sequence, which means that it takes more than 40 minutes to analyze the atmosphere of this annealing furnace. Summary of the Invention

[0005] The purpose of this invention is to provide a method for quickly locating fault points where the atmosphere of an annealing furnace in a continuous annealing line is disrupted, so as to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for quickly locating fault points where the atmosphere of an annealing furnace in a continuous annealing line is disrupted includes the following steps:

[0008] Step 1: Set up three sampling points on the pipes of the fans in the preheating section, slow cooling section, rapid cooling section and final cooling section of the annealing furnace, namely a negative pressure point, a positive pressure point and a manual sampling point; both the positive and negative pressure points are connected to the gas analyzer;

[0009] The manual sampling point is located directly below the fan heat exchanger, the negative pressure point and the positive pressure point are located at the air inlet and air outlet of the fan on the heat exchange pipe, respectively, and both the manual sampling point and the negative pressure point are located on the heat exchange pipe between the heat exchanger and the fan.

[0010] The protective gases in the preheating section, heating section, soaking section, rapid cooling section, aging section and final cooling section of the annealing furnace are all connected to the gas analyzer. Under normal conditions, the analyzer is connected to the protective gases in each section of the furnace.

[0011] Step 2: The oxygen content and dew point values ​​at different furnace sections and three sampling points in the heat exchange pipe are measured by the gas analyzer.

[0012] Step 3: If the oxygen content in the slow cooling section, rapid cooling section, and final cooling section is >20ppm, measure the oxygen content at each negative pressure point and positive pressure point in the section where the oxygen content exceeds the standard.

[0013] If the oxygen content in the preheating section is >20ppm, check the gap size of the furnace inlet sealing roller, the nitrogen sealing pressure at the furnace inlet, and measure the oxygen content at each negative pressure point and positive pressure point in the preheating section separately.

[0014] Step 4: If the dew point value of the slow cooling section, rapid cooling section, and final cooling section is > -20℃, measure the dew point value at each negative pressure point and positive pressure point of the section where the oxygen content exceeds the standard separately.

[0015] If the dew point value of the preheating section, heating section, soaking section, and aging section is greater than -20℃, check the closed-loop cooling water condition.

[0016] As a further improvement of the present invention, in step three, if the oxygen content value of the slow cooling section, the fast cooling section, and the final cooling section is >20ppm, step (3) is executed directly; if the oxygen content value of the preheating section is >20ppm, steps (1) to (3) are executed.

[0017] Step (1): Check the size of the gap between the sealing rollers at the furnace inlet. If the gap is >5mm, readjust the gap; if the gap is ≤5mm, proceed to step (2).

[0018] Step (2): Check the nitrogen sealing pressure at the furnace inlet. If the sealing pressure is <100pa, readjust the pressure; if the sealing pressure is ≥100pa, proceed to step (3).

[0019] Step (3): Measure the oxygen content at each negative pressure point and positive pressure point in the section where the oxygen content exceeds the standard;

[0020] Switch the gas analyzer to manual mode and operate on the sampling point on the first heat exchange pipe in the section with excessive oxygen content: open the valve on the pipeline between the negative pressure point and the gas analyzer, close the valve on the pipeline between the positive pressure point and the gas analyzer, record the data of the gas analyzer after ten minutes, open the valve on the pipeline between the positive pressure point and the gas analyzer, close the valve on the pipeline between the negative pressure point and the gas analyzer, and record the data of the gas analyzer after ten minutes.

[0021] If the oxygen content at both the negative pressure point and the positive pressure point is ≤40ppm, then the above operation is performed sequentially on the sampling points of the remaining heat exchange pipes in the section with excessive oxygen content until the heat exchange pipe with oxygen content >40ppm at the negative pressure point and / or the positive pressure point is found.

[0022] The ratio of positive pressure point to negative pressure point value was analyzed for heat exchange pipelines with oxygen content >40ppm.

[0023] As a further improvement of the present invention

[0024] If the oxygen content value of the heat exchange pipeline is >40ppm, the oxygen content value at the positive pressure point is >1.5 times the oxygen content value at the negative pressure point; for the slow cooling section, fast cooling section, and final cooling section, check whether there is leakage at the fan shaft seal; for the preheating section, check whether the carbon ring seal at the fan shaft head is severely worn.

[0025] If the oxygen content of the heat exchange pipeline is >40ppm, the ratio of the oxygen content at the positive pressure point to the oxygen content at the negative pressure point should be between 0.9 and 1.1. For the slow cooling section, fast cooling section, and final cooling section, turn off the fan on this heat exchange pipeline and use a hydrogen alarm to check for hydrogen leaks at the flange, weld, and expansion joint on the negative pressure side of the fan. For the preheating section, use a handheld CO2 analyzer to test at the pre-reserved opening after the heat exchanger. If the CO2 content is >1%, replace the heat exchanger for this heat exchange pipeline. If the CO2 content is ≤1%, turn off the fan on this heat exchange pipeline and use a handheld hydrogen analyzer to gradually test this heat exchange pipeline.

[0026] As a further improvement of the present invention, step four, measuring the dew point value at each negative pressure point and positive pressure point in the oxygen content exceeding the standard range, includes the following steps:

[0027] Switch the gas analyzer to manual mode and operate on the sampling point on the first heat exchange pipe in the dew point exceeding the standard section: open the valve on the pipeline between the negative pressure point and the gas analyzer, close the valve on the pipeline between the positive pressure point and the gas analyzer, record the data of the gas analyzer after ten minutes; open the valve on the pipeline between the positive pressure point and the gas analyzer, close the valve on the pipeline between the negative pressure point and the gas analyzer, and record the data of the gas analyzer after ten minutes.

[0028] If the dew point values ​​at both the negative pressure point and the positive pressure point are ≤-10℃, then the above operation is performed sequentially on the sampling points of the remaining heat exchange pipes in the dew point exceeding the standard section until the heat exchange pipes with dew point values ​​>-10℃ at the negative pressure point and / or positive pressure point are found.

[0029] Turn off the fan of the heat exchange pipe with a dew point value > -10℃, open the valve at the manual sampling point, and observe whether water flows out. If water flows out, it proves that the heat exchanger is leaking.

[0030] As a further improvement of the present invention, in step four, a pressure holding test is performed using a booster pump to check the closed-loop cooling water situation. The pressure of the booster pump is 0.5 MPa, and the pressure holding time is 30 minutes.

[0031] As a further improvement of the present invention, an electromagnetic valve is provided on the pipeline between the positive pressure point, the negative pressure point and the gas analyzer; a manual ball valve is provided on the pipeline between the manual sampling point and the gas analyzer.

[0032] As a further improvement of the present invention, the gas analyzer is a cabinet-type gas analyzer.

[0033] The beneficial effects of adopting the above technical solution are as follows:

[0034] This invention utilizes sampling points set before and after the fan and after the heat exchanger, with pipelines connecting these sampling points to a gas analyzer. Based on the data measured at these sampling points by the gas analyzer, the faulty furnace section where the protective atmosphere within the annealing furnace is disrupted can be quickly located. This allows for targeted inspection of the faulty furnace section, rapidly identifying the root cause of the disruption to the protective atmosphere within the furnace. Compared to existing analytical methods, this approach is faster, more convenient, and more efficient. Attached Figure Description

[0035] Figure 1 This is a connection diagram of the present invention;

[0036] Figure 2 This is a schematic diagram showing the locations of three sampling points in the slow cooling section, rapid cooling section, and final cooling section.

[0037] Figure 3 This is a schematic diagram showing the locations of three sampling points on the preheating section. Detailed Implementation

[0038] To better understand the purpose, structure, and function of this invention, the invention will be clearly and completely described below with reference to the accompanying drawings.

[0039] like Figures 1-3 The method shown includes the following steps for quickly locating fault points where the atmosphere of an annealing furnace in a continuous annealing line is disrupted:

[0040] Step 1: Connect the gas analyzer to the common fault area;

[0041] Three sampling points are set on the pipes of the fans in the preheating section, slow cooling section, rapid cooling section, and final cooling section of the annealing furnace: a negative pressure point, a positive pressure point, and a manual sampling point. Both the positive and negative pressure points are connected to a gas analyzer. The data measured by the gas analyzer at the sampling points can quickly pinpoint the faulty section of the furnace where the atmosphere has been disrupted, allowing for targeted inspection of the faulty section and rapid identification of the root cause of the disruption to the protective atmosphere within the furnace. In this embodiment, the gas analyzer is a cabinet-type gas analyzer.

[0042] The manual sampling point is located directly below the fan heat exchanger. The negative pressure point and the positive pressure point are located at the fan inlet and outlet on the heat exchange pipeline, respectively. Both the manual sampling point and the negative pressure point are located on the heat exchange pipeline between the heat exchanger and the fan. Specifically, both ends of the heat exchange pipeline are connected to the furnace section's outlet and inlet, respectively. Along the direction from the outlet to the inlet, the heat exchanger and the fan are installed sequentially on the heat exchange pipeline. The fans on the heat exchange pipelines connecting the slow cooling section, the fast cooling section, and the final cooling section are cooling fans, and the fans on the heat exchange pipelines connecting the preheating section are preheating circulation fans. Furthermore, solenoid valves are installed on the pipelines between the positive pressure point, the negative pressure point, and the gas analyzer; a manual ball valve is installed on the pipeline between the manual sampling point and the gas analyzer.

[0043] The protective gases in the preheating section, heating section, soaking section, rapid cooling section, aging section and final cooling section of the annealing furnace are all connected to the gas analyzer. Under normal conditions, the analyzer is connected to the protective gases in each section of the furnace.

[0044] Step 2: The oxygen content and dew point values ​​at three sampling points in different sections of the annealing furnace and the heat exchange pipe are measured by the gas analyzer; then, based on the data analyzed by the cabinet analyzer, the area where the furnace atmosphere is damaged is located.

[0045] Step 3: Locate furnace sections with oxygen content >20ppm and perform targeted troubleshooting:

[0046] If the oxygen content in the slow cooling section, rapid cooling section, and final cooling section is >20ppm, measure the oxygen content at each negative pressure point and positive pressure point in the section where the oxygen content exceeds the standard.

[0047] If the oxygen content in the preheating section is >20ppm, check the gap size of the furnace inlet sealing roller, the nitrogen sealing pressure at the furnace inlet, and measure the oxygen content at each negative pressure point and positive pressure point in the preheating section separately.

[0048] The specific investigation includes the following steps:

[0049] Step (1): Check the size of the gap between the sealing rollers at the furnace inlet. If the gap is >5mm, readjust the gap until it is ≤5mm. If the gap is ≤5mm, proceed to step (2).

[0050] Step (2): Check the nitrogen sealing pressure at the furnace inlet. If the sealing pressure is <100pa, readjust the pressure until the sealing pressure is ≥100pa; if the sealing pressure is ≥100pa, proceed to step (3).

[0051] Step (3): Measure the oxygen content at each negative pressure point and positive pressure point in the section where the oxygen content exceeds the standard;

[0052] Switch the gas analyzer to manual mode and operate on the sampling point on the first heat exchange pipe in the section with excessive oxygen content: open the valve on the pipeline between the negative pressure point and the gas analyzer, close the valve on the pipeline between the positive pressure point and the gas analyzer, record the data of the gas analyzer after ten minutes, open the valve on the pipeline between the positive pressure point and the gas analyzer, close the valve on the pipeline between the negative pressure point and the gas analyzer, and record the data of the gas analyzer after ten minutes.

[0053] If the oxygen content at both the negative pressure point and the positive pressure point is ≤40ppm, then the above operation is performed sequentially on the sampling points of the remaining heat exchange pipes in the section with excessive oxygen content until the heat exchange pipe with oxygen content >40ppm at the negative pressure point and / or the positive pressure point is found.

[0054] The ratio of positive pressure point to negative pressure point value was analyzed for heat exchange pipes with oxygen content >40ppm;

[0055] Since the volume of protective gas inside the furnace is greater than that inside the blower, and the oxygen content of the protective gas inside the furnace will be partially consumed by the furnace zone release and reaction, the oxygen content values ​​before and after the blower in the heat exchange pipe are higher than the oxygen content values ​​inside the furnace. Therefore, we search for heat exchange pipes with oxygen content values ​​> 40 ppm.

[0056] In the above steps, if the oxygen content of the slow cooling section, fast cooling section, and final cooling section is greater than 20 ppm, proceed directly to step (3); if the oxygen content of the preheating section is greater than 20 ppm, proceed from step (1) to step (3).

[0057] Furthermore, if the oxygen content value of the heat exchange pipeline is >40ppm, the oxygen content value at the positive pressure point is >1.5 times the oxygen content value at the negative pressure point; for the slow cooling section, fast cooling section, and final cooling section, check whether there is leakage at the fan shaft seal; for the preheating section, check whether the carbon ring seal at the fan shaft head is severely worn, and thus troubleshoot the fault.

[0058] If the oxygen content of the heat exchange pipeline is >40ppm, the ratio of the oxygen content at the positive pressure point to the oxygen content at the negative pressure point should be between 0.9 and 1.1. For the slow cooling section, fast cooling section, and final cooling section, turn off the fan on this heat exchange pipeline and use a hydrogen alarm to check for hydrogen leaks at the flange, weld, and expansion joint on the negative pressure side of the fan. For the preheating section, use a handheld CO2 analyzer to test at the pre-reserved opening after the heat exchanger. If the CO2 content is >1%, replace the heat exchanger for this heat exchange pipeline. If the CO2 content is ≤1%, turn off the fan on this heat exchange pipeline and use a handheld hydrogen analyzer to gradually test this heat exchange pipeline.

[0059] Step 4: Locate furnace sections with dew point values ​​> -20℃ and perform targeted troubleshooting:

[0060] If the dew point value of the slow cooling section, rapid cooling section, and final cooling section is > -20℃, measure the dew point value at each negative pressure point and positive pressure point of the section where the oxygen content exceeds the standard separately;

[0061] Specifically, switch the gas analyzer to manual mode and operate on the sampling point on the first heat exchange pipe in the dew point exceeding the standard section: open the valve on the pipeline between the negative pressure point and the gas analyzer, close the valve on the pipeline between the positive pressure point and the gas analyzer, record the data of the gas analyzer after ten minutes, open the valve on the pipeline between the positive pressure point and the gas analyzer, close the valve on the pipeline between the negative pressure point and the gas analyzer, and record the data of the gas analyzer after ten minutes.

[0062] If the dew point values ​​at both the negative pressure point and the positive pressure point are ≤-10℃, then the above operation is performed sequentially on the sampling points of the remaining heat exchange pipes in the dew point exceeding the standard section until the heat exchange pipes with dew point values ​​>-10℃ at the negative pressure point and / or positive pressure point are found.

[0063] Since the volume of protective gas inside the furnace is greater than that inside a single blower, and part of the dew point of the protective gas inside the furnace is consumed by the furnace zone venting and reaction, the dew point value caused by heat exchanger leakage is higher than the dew point value inside the furnace. Therefore, heat exchange pipes with dew point values ​​> -10℃ should be searched.

[0064] Turn off the fan of the heat exchange pipe with a dew point value > -10℃, open the valve on the pipeline between the manual sampling point and the gas analyzer, and observe whether water flows out. If water flows out, it proves that the heat exchanger is leaking.

[0065] If the dew point value of the preheating section, heating section, soaking section, and aging section is > -20℃, check the closed-loop cooling water condition. Specifically, use a booster pump to perform a pressure holding test to check. The pressure of the booster pump is 0.5 MPa, and the pressure holding time is 30 minutes. The main location to check is the bearing water cooling jacket of the furnace roller.

[0066] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A method for quickly locating fault points where the atmosphere of an annealing furnace in a continuous annealing line is disrupted, characterized in that: It includes the following steps: Step 1: Set up three sampling points on the pipes of the fans in the preheating section, slow cooling section, rapid cooling section and final cooling section of the annealing furnace, namely a negative pressure point, a positive pressure point and a manual sampling point; both the positive and negative pressure points are connected to the gas analyzer; The manual sampling point is located directly below the fan heat exchanger, the negative pressure point and the positive pressure point are located at the air inlet and air outlet of the fan on the heat exchange pipe, respectively, and both the manual sampling point and the negative pressure point are located on the heat exchange pipe between the heat exchanger and the fan. The protective gases in the preheating section, heating section, soaking section, rapid cooling section, aging section and final cooling section of the annealing furnace are all connected to the gas analyzer. Under normal conditions, the analyzer is connected to the protective gases in each section of the furnace. Step 2: The oxygen content and dew point values ​​at different furnace sections and three sampling points in the heat exchange pipe are measured by the gas analyzer. Step 3: If the oxygen content in the slow cooling section, rapid cooling section, and final cooling section is >20ppm, measure the oxygen content at each negative pressure point and positive pressure point in the section where the oxygen content exceeds the standard. If the oxygen content in the preheating section is >20ppm, check the gap size of the furnace inlet sealing roller, the nitrogen sealing pressure at the furnace inlet, and measure the oxygen content at each negative pressure point and positive pressure point in the preheating section separately. Step 4: If the dew point value of the slow cooling section, rapid cooling section, and final cooling section is > -20℃, measure the dew point value at each negative pressure point and positive pressure point of the section where the oxygen content exceeds the standard separately. If the dew point value of the preheating section, heating section, soaking section, and aging section is greater than -20℃, check the closed-loop cooling water condition.

2. The method for quickly locating fault points where the atmosphere of an annealing furnace in a continuous annealing line is disrupted, as described in claim 1, is characterized in that: In step three, if the oxygen content of the slow cooling section, the fast cooling section, and the final cooling section is greater than 20 ppm, proceed directly to step (3); if the oxygen content of the preheating section is greater than 20 ppm, proceed from step (1) to step (3). Step (1): Check the size of the gap between the sealing rollers at the furnace inlet. If the gap is >5mm, readjust the gap; if the gap is ≤5mm, proceed to step (2). Step (2): Check the nitrogen sealing pressure at the furnace inlet. If the sealing pressure is <100pa, readjust the pressure; if the sealing pressure is ≥100pa, proceed to step (3). Step (3): Measure the oxygen content at each negative pressure point and positive pressure point in the section where the oxygen content exceeds the standard; Switch the gas analyzer to manual mode and operate on the sampling point on the first heat exchange pipe in the section with excessive oxygen content: open the valve on the pipeline between the negative pressure point and the gas analyzer, close the valve on the pipeline between the positive pressure point and the gas analyzer, record the data of the gas analyzer after ten minutes, open the valve on the pipeline between the positive pressure point and the gas analyzer, close the valve on the pipeline between the negative pressure point and the gas analyzer, and record the data of the gas analyzer after ten minutes. If the oxygen content at both the negative pressure point and the positive pressure point is ≤40ppm, then the above operation is performed sequentially on the sampling points of the remaining heat exchange pipes in the section with excessive oxygen content until the heat exchange pipe with oxygen content >40ppm at the negative pressure point and / or the positive pressure point is found. The ratio of positive pressure point to negative pressure point value was analyzed for heat exchange pipelines with oxygen content >40ppm.

3. The method for quickly locating fault points where the atmosphere of an annealing furnace in a continuous annealing line is disrupted, as described in claim 2, is characterized in that: If the oxygen content value of the heat exchange pipeline is >40ppm, the oxygen content value at the positive pressure point is >1.5 times the oxygen content value at the negative pressure point; for the slow cooling section, fast cooling section, and final cooling section, check whether there is leakage at the fan shaft seal; for the preheating section, check whether the carbon ring seal at the fan shaft head is severely worn. If the oxygen content of the heat exchange pipeline is >40ppm, the ratio of the oxygen content at the positive pressure point to the oxygen content at the negative pressure point should be between 0.9 and 1.

1. For the slow cooling section, fast cooling section, and final cooling section, turn off the fan on this heat exchange pipeline and use a hydrogen alarm to check for hydrogen leaks at the flange, weld, and expansion joint on the negative pressure side of the fan. For the preheating section, use a handheld CO2 analyzer to test at the pre-reserved opening after the heat exchanger. If the CO2 content is >1%, replace the heat exchanger for this heat exchange pipeline. If the CO2 content is ≤1%, turn off the fan on this heat exchange pipeline and use a handheld hydrogen analyzer to gradually test this heat exchange pipeline.

4. The method for quickly locating fault points where the atmosphere of an annealing furnace in a continuous annealing line is disrupted, as described in claim 1, is characterized in that: Step four involves individually measuring the dew point values ​​at each negative and positive pressure point within the oxygen content exceeding the standard range, including the following steps: Switch the gas analyzer to manual mode and operate on the sampling point on the first heat exchange pipe in the dew point exceeding the standard section: open the valve on the pipeline between the negative pressure point and the gas analyzer, close the valve on the pipeline between the positive pressure point and the gas analyzer, record the data of the gas analyzer after ten minutes; open the valve on the pipeline between the positive pressure point and the gas analyzer, close the valve on the pipeline between the negative pressure point and the gas analyzer, and record the data of the gas analyzer after ten minutes. If the dew point values ​​at both the negative pressure point and the positive pressure point are ≤-10℃, then the above operation is performed sequentially on the sampling points of the remaining heat exchange pipes in the dew point exceeding the standard section until the heat exchange pipes with dew point values ​​>-10℃ at the negative pressure point and / or positive pressure point are found. Turn off the fan of the heat exchange pipe with a dew point value > -10℃, open the valve at the manual sampling point, and observe whether water flows out. If water flows out, it proves that the heat exchanger is leaking.

5. The method for quickly locating fault points where the atmosphere of an annealing furnace in a continuous annealing line is disrupted, as described in claim 1, is characterized in that: In step four, a pressure holding test is performed using a booster pump to check the closed-loop cooling water situation. The booster pump pressure is 0.5 MPa, and the pressure holding time is 30 minutes.

6. The method for quickly locating fault points where the atmosphere of an annealing furnace in a continuous annealing line is disrupted, as described in claim 1, is characterized in that: Solenoid valves are installed on the pipelines between the positive pressure point, the negative pressure point and the gas analyzer; manual ball valves are installed on the pipelines between the manual sampling point and the gas analyzer.

7. The method for quickly locating fault points where the atmosphere of an annealing furnace in a continuous annealing line is disrupted, as described in claim 1, is characterized in that: The gas analyzer is a cabinet-type gas analyzer.

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