A method for judging leakage of a quick cut-off valve of a regenerative heating furnace

Abstract

The application discloses a kind of quick cut valve leakage judging methods of regenerative heating furnace, comprising the following steps: step S1, air regulating valve on main pipeline is adjusted to preset opening degree;Step S2, close all branch roads on flue gas quick cut valve group, and the n air quick cut valves of air quick cut valve group are all fully opened, obtain the initial section flow L of air regulating valve;Check in turn each air quick cut valve, monitor and record the flow value corresponding to each air regulating valve, according to n flow value and initial section flow L, calculate and obtain the flow variation parameter corresponding to each air quick cut valve, if flow variation parameter does not satisfy preset error interval, then judge that corresponding air quick cut valve possibly exists leakage anomaly, can be quickly investigated to find out that regenerative heating furnace exists leakage risk air quick cut valve and flue gas quick cut valve, so that by maintaining or replacing corresponding valve can quickly restore burner and normal combustion of regenerative tank.

Description

Technical Field

[0001] This invention relates to the field of hot rolling equipment technology, and specifically to a method for judging leakage of a quick-cut valve in a regenerative heating furnace. Background Technology

[0002] After prolonged use, regenerative heating furnaces in hot rolling mills are prone to issues such as inconsistent exhaust temperatures in the regenerator tanks, severe flames at the furnace tail, increased furnace pressure, and increased fuel consumption and slab burn-off, thus increasing production costs. Routine inspections have revealed that air leaks in the air and flue gas quick-cut valves of the regenerative burners are the primary cause of these problems. However, because the leakage of these valves cannot be directly measured with instruments, operators cannot identify which valves are leaking or not closing properly. This hinders the rapid identification and replacement of leaking valves, prolonging the time required to restore the regenerative heating furnace to normal operating conditions and negatively impacting production cost control.

[0003] In summary, the existing technology has technical problems such as the inability to quickly diagnose faults in the air quick-cut valve and flue gas quick-cut valve, which leads to the regenerative heating furnace being in an abnormal working state for a long time, increasing fuel consumption, and reducing slab yield. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for judging the leakage of quick-cut valves in regenerative heating furnaces. This method can quickly identify air quick-cut valves and flue gas quick-cut valves in regenerative heating furnaces that have leakage risks. By maintaining or replacing the corresponding valves, the normal combustion of the burners and regenerators can be ensured, a weak reducing atmosphere can be maintained in the furnace, flames can be reduced at the furnace tail, and the heat storage capacity of the regenerators can be improved, thereby reducing fuel consumption and increasing the yield of slabs.

[0005] The solution to achieve the technical objective of this invention is a method for judging leakage of a quick-cut valve in a regenerative heating furnace, comprising the following steps:

[0006] Step S1: Adjust the air regulating valve on the main pipeline to the preset opening degree;

[0007] Step S2: Close all flue gas quick-cut valve assemblies on all branches, and fully open all n quick-cut valves in the air quick-cut valve assembly to obtain the initial flow rate L of the air regulating valve; operate each quick-cut valve sequentially for inspection, monitor and record the flow rate value corresponding to each air regulating valve, and calculate the flow rate change parameter corresponding to each quick-cut valve based on the n flow rate values ​​and the initial flow rate L. If the flow rate change parameter does not meet the preset error range, it is determined that the corresponding quick-cut valve may have a leakage abnormality.

[0008] In some embodiments, before or after step S2, the method for determining leakage of the quick-cut valve of the regenerative heating furnace further includes:

[0009] Step S1': Adjust the flue gas regulating valve on the main pipeline to the preset opening degree;

[0010] Step S2': Close all air quick-cut valve assemblies on all branches, and fully open all n flue gas quick-cut valves in the flue gas quick-cut valve assembly to obtain the initial section flow rate M of the flue gas regulating valve; operate each flue gas quick-cut valve in sequence, monitor and record the flow rate value corresponding to each flue gas regulating valve, and calculate the flow rate change parameter corresponding to each flue gas quick-cut valve based on the n flow rate values ​​and the initial section flow rate M. If the flow rate change parameter does not meet the preset error range, it is determined that the corresponding flue gas quick-cut valve may have a leakage abnormality.

[0011] In some embodiments, step S2 specifically includes: switching one of the air quick-cut valves to a fully closed state, while keeping the remaining air quick-cut valves fully open; recording the flow rate of the air regulating valve in the main pipeline at this time, which is recorded as the flow rate data of the fully closed air quick-cut valve; then switching the air quick-cut valve from a fully closed state to a fully open state; operating the other air quick-cut valves in sequence according to this method to obtain n flow rates; if the ratio of the flow rate value to the initial flow rate L is greater than (n-1) / n, it is determined that the air quick-cut valve whose state change corresponds to the flow rate value may have a leakage abnormality.

[0012] In some embodiments, the method for determining leakage of the quick-cut valve of the regenerative heating furnace further includes:

[0013] Step S3: Under normal operating conditions, monitor the exhaust temperature of each heat storage box. If the exhaust temperature drops below the first preset temperature or rises above the second preset temperature, it is determined that the air quick-cut valve or flue gas quick-cut valve corresponding to the heat storage box may have a leakage abnormality.

[0014] In some embodiments, determining that the air quick-cut valve or flue gas quick-cut valve corresponding to the heat storage box may have a leakage abnormality specifically includes: determining that the air quick-cut valve corresponding to the heat storage box with an exhaust gas temperature below 100°C may have a leakage abnormality; determining that the flue gas quick-cut valve corresponding to the heat storage box with an exhaust gas temperature above 230°C may have a leakage abnormality.

[0015] In some embodiments, the method for determining leakage of the quick-cut valve of the regenerative heating furnace further includes:

[0016] Step S4: Check whether the proximity switch stop of each flue gas quick-cut valve and air quick-cut valve has a rotatable angle. If there is a rotatable angle and the rotatable angle is greater than the preset value, it is determined that the corresponding flue gas quick-cut valve or air quick-cut valve may have a leakage abnormality.

[0017] In some embodiments, checking whether the proximity switch stop corresponding to each flue gas quick-cut valve and air quick-cut valve has a rotatable angle range specifically includes: swinging the proximity switch stop up and down along the active direction of the proximity switch stop; if the rotatable angle range of the proximity switch stop is greater than 15°, it is determined that the corresponding flue gas quick-cut valve or air quick-cut valve may have a leakage abnormality.

[0018] In some embodiments, the method for determining leakage of the quick-cut valve of the regenerative heating furnace further includes:

[0019] Step S5: Record the flue gas quick-cut valves and air quick-cut valves that are judged to be possibly leaking abnormally based on changes in flow rate, flue gas quick-cut valves and air quick-cut valves that are judged to be possibly leaking abnormally based on abnormal exhaust temperature, and flue gas quick-cut valves and air quick-cut valves that are judged to be possibly leaking abnormally based on the rotatable angle measurement.

[0020] Step S6: Take the intersection of the flue gas quick-cut valves and air quick-cut valves that are judged to be possibly leaking abnormally by the above three different methods. The flue gas quick-cut valve / air quick-cut valve that is judged to be possibly leaking abnormally by all three methods must have a leakage problem.

[0021] In some embodiments, prior to steps S2 and 2', the method for determining leakage of the quick-cut valve in a regenerative heating furnace further includes:

[0022] When both the air valve assembly and the flue gas quick-cut valve assembly are set to manual control, the flow rate of the air regulating valve or the flue gas regulating valve on the main pipeline remains unchanged.

[0023] In some embodiments, step S1, adjusting the air regulating valve on the main pipeline to a preset opening, specifically includes: adjusting the flow opening of the air regulating valve to 80% to 100%.

[0024] As can be seen from the above technical solution, the present invention provides a method for judging leakage of a quick-cut valve in a regenerative heating furnace, comprising the following steps:

[0025] Step S1: Adjust the air regulating valve on the main pipeline to the preset opening degree to ensure that the opening degree of the air regulating valve remains unchanged in the subsequent process, so as to control the variable to ensure the accuracy of subsequent measurement and judgment.

[0026] Step S2: Close all flue gas quick-cut valve assemblies on all branches, and fully open all n quick-cut valves in the air quick-cut valve assembly to obtain the initial flow rate L of the air regulating valve. Operate each quick-cut valve sequentially for inspection, monitor and record the flow rate value corresponding to each air regulating valve, and calculate the flow rate change parameters corresponding to each quick-cut valve based on the n flow rates and the initial flow rate L. If the flow rate change parameters do not meet the preset error range, it is determined that the corresponding quick-cut valve may have a leakage abnormality. Further investigation can then be conducted on the confirmed quick-cut valves that may have leakage abnormalities, significantly improving the efficiency and speed of troubleshooting, shortening the maintenance time of the regenerative heating furnace, and thus quickly restoring the burner to normal combustion conditions. This solves a series of problems caused by air quick-cut valve leakage, maintains a weak reducing atmosphere in the furnace, reduces furnace tail flameout, and improves the heat storage capacity of the regenerator, thereby reducing fuel consumption and increasing the slab yield. Attached Figure Description

[0027] Figure 1 A flowchart illustrating the method for determining leakage of a quick-cut valve in a regenerative heating furnace according to an embodiment of the present invention;

[0028] Figure 2 This is a partial circuit diagram of a regenerative heating furnace.

[0029] Explanation of reference numerals in the attached diagram: 1-Heat storage box, 2-Burn, 3-Main pipeline, 4-Air regulating valve, 5-Flue gas regulating valve, 6-Flue gas quick-cut valve, 7-Air quick-cut valve. Detailed Implementation

[0030] To enable those skilled in the art to better understand this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] To address the technical problem of existing technologies' inability to quickly identify leaking air and flue gas quick-cut valves, this invention provides a method for judging leaks in quick-cut valves of regenerative heating furnaces. This method can quickly identify air and flue gas quick-cut valves with leakage risks in regenerative heating furnaces. By maintaining or replacing the corresponding valves, the normal combustion of the burners and regenerator can be ensured, maintaining a weak reducing atmosphere in the furnace, reducing furnace tail flameout, and improving the heat storage capacity of the regenerator, thereby reducing fuel consumption and increasing slab yield. The following detailed description of this invention is provided through a specific embodiment:

[0032] Example

[0033] like Figure 1 and Figure 2 As shown, this embodiment provides a method for determining leakage in a quick-cut valve of a regenerative heating furnace, including the following steps:

[0034] Step S1: Adjust the air regulating valve 4 on the main pipeline 3 to the preset opening degree to ensure that the opening degree of the air regulating valve 4 remains unchanged in the subsequent process, so as to control the variable to ensure the accuracy of subsequent measurement and judgment.

[0035] Step S2: Close all flue gas quick-cut valve assemblies on all branches, and fully open all n quick-cut valves 7 of the quick-cut valve assembly to obtain the initial flow rate L of the air regulating valve 4; sequentially operate each quick-cut valve 7 for inspection, monitor and record the flow rate value corresponding to each air regulating valve 4, and calculate the flow rate change parameter corresponding to each quick-cut valve 7 based on the n flow rate values ​​and the initial flow rate L. If the flow rate change parameter does not meet the preset error range, it is determined that the corresponding quick-cut valve 7 may have a leakage abnormality. Subsequently, the confirmed quick-cut valve 7 with possible leakage abnormality can be further determined, which significantly improves the efficiency and speed of troubleshooting, shortens the maintenance time of the regenerative heating furnace, and thus restores the burner 2 to normal combustion conditions as soon as possible. This solves a series of problems caused by the leakage of the quick-cut valve 7, maintains a weak reducing atmosphere in the furnace, reduces the flame at the furnace tail, and improves the heat storage capacity of the heat storage box 1, thereby reducing fuel consumption and increasing the yield of slabs.

[0036] Similarly, the above-mentioned troubleshooting methods and means are used to check each of the flue gas quick-cut valves 6 in the flue gas quick-cut valve group. Specifically, before or after step S2, the method for judging leakage of the quick-cut valve of the regenerative heating furnace also includes:

[0037] Step S1': Adjust the flue gas regulating valve 5 on the main pipeline 3 to the preset opening degree;

[0038] Step S2': Close all air quick-cut valve assemblies on all branches, and fully open all n flue gas quick-cut valves 6 in the flue gas quick-cut valve assembly to obtain the initial flow rate M of the flue gas regulating valve 5; operate each flue gas quick-cut valve 6 in sequence, monitor and record the flow rate value corresponding to each flue gas regulating valve 5, and calculate the flow rate change parameter corresponding to each flue gas quick-cut valve 6 based on the n flow rate values ​​and the initial flow rate M. If the flow rate change parameter does not meet the preset error range, it is determined that the corresponding flue gas quick-cut valve 6 may have a leakage abnormality.

[0039] It should be noted that this application does not limit the inspection order of the air quick-cut valve assembly and the flue gas quick-cut valve assembly. In some embodiments, steps S1 and S2 can be performed first, followed by steps S1' and S2'. In other embodiments, steps S1' and S2' can be performed first, followed by steps S1 and S2. Furthermore, there is no specific limitation on the implementation order of steps S1 and S1'. In some embodiments, the order can be "step S1-step S1'-step S2'-step S2". In other methods, the order can be "step S1-step S1'-step S2-step S2'". That is, the air regulating valve 4 and the flue gas regulating valve 5 can be adjusted to the preset opening degree in the first step, and then steps S2 and S2' can be performed as needed.

[0040] As one implementation method, step S2 specifically includes: switching one of the air quick-cut valves 7 to a fully closed state, while keeping the remaining air quick-cut valves 7 fully open; recording the flow rate of the air regulating valve 4 in the main pipeline 3 at this time, which is recorded as the flow rate data of the fully closed air quick-cut valve 7; then switching the air quick-cut valve 7 from a fully closed state to a fully open state; operating the other air quick-cut valves 7 in sequence according to this method to obtain n flow rates; if the ratio of the flow rate value to the initial flow rate L is greater than (n-1) / n, it is determined that the air quick-cut valve 7 corresponding to the state change of the flow rate value may have a leakage abnormality, that is, by comparing the proportion of the flow rate change after closing the air quick-cut valve 7 with the proportion of this valve to all valves in this section, it can be determined whether the currently tested air quick-cut valve 7 has an air leakage problem.

[0041] For example, the first section of a regenerative heating furnace has eight burners 2, and each burner 2 theoretically has the same flow rate, meaning that the flow rate of each burner 2 accounts for 1 / 8 of the flow rate on the main pipeline 3. By adjusting the opening of the air regulating valve 4, cutting off all flue gas quick-cut valves 6, and with all air quick-cut valves 7 fully open, the measured flow rate is 800 m³. After closing one air quick-cut valve 7, theoretically, the measured flow rate on the main pipeline 3 will become close to 700 m³. The ratio of the change in flow rate is (800-700) / 800, which matches the 1 / 8 proportion of the burner 2. Therefore, by closing the air quick-cut valves 7 one by one in this way, and ensuring that only one quick-cut valve is closed during measurement, it is possible to determine whether there is a possibility of abnormal leakage in the currently closed air quick-cut valve 7 based on the flow rate value obtained from the current monitoring record. Steps S2 and S2' can both use the same test method, which will not be elaborated in this embodiment.

[0042] To further and more quickly determine the probability of leakage, as a preferred implementation method, the leakage detection method for the quick-cut valve of a regenerative heating furnace also includes:

[0043] Step S3: Under normal operating conditions, monitor the exhaust temperature of each heat storage box 1. If the exhaust temperature drops below the first preset temperature or rises above the second preset temperature, it is determined that the air quick-cut valve 7 or flue gas quick-cut valve 6 corresponding to the heat storage box 1 may have a leakage abnormality.

[0044] In this embodiment, determining that the air quick-cut valve 7 or flue gas quick-cut valve 6 corresponding to the heat storage box 1 may have a leakage abnormality specifically includes: determining that the air quick-cut valve 7 corresponding to the heat storage box 1 with an exhaust gas temperature below 100°C may have a leakage abnormality; determining that the flue gas quick-cut valve 6 corresponding to the heat storage box 1 with an exhaust gas temperature above 230°C may have a leakage abnormality.

[0045] To further and quickly determine the probability of leakage, the leakage judgment method for the quick-cut valve of the regenerative heating furnace also includes: Step S4, checking whether the proximity switch stop of each flue gas quick-cut valve 6 and air quick-cut valve 7 has a rotatable angle. If there is a rotatable angle and the rotatable angle is greater than the preset value, it can be determined that the valve plate of the air quick-cut valve 7 / flue gas quick-cut valve 6 is not tightly closed during the opening and closing process, and it is determined that the corresponding flue gas quick-cut valve 6 or air quick-cut valve 7 may have a leakage abnormality. The specific impact can be quantified to a certain extent by the flow rate changes in steps S1, S2, S1', and S2', so that the judgment can be assisted by manually moving the proximity switch stop of the air quick-cut valve 7 / flue gas quick-cut valve 6 during daily inspections.

[0046] As one implementation method, check whether the proximity switch stop corresponding to each flue gas quick-cut valve 6 and air quick-cut valve 7 has a rotatable angle range. Specifically, this includes swinging the proximity switch stop up and down along the movement direction of the proximity switch stop. If the rotatable angle range of the proximity switch stop is greater than 15°, it is determined that the corresponding flue gas quick-cut valve 6 or air quick-cut valve 7 may have a leakage abnormality.

[0047] Since the results obtained by each of the above methods individually require further verification and confirmation, and the flue gas quick-cut valve 6 and air quick-cut valve 7 that are identified by the three methods inevitably have leaks, in order to directly and quickly determine which flue gas quick-cut valves 6 and air quick-cut valves 7 are abnormally leaking, the leak judgment method for quick-cut valves of regenerative heating furnaces also includes:

[0048] Step S5: Record the flue gas quick-cut valve 6 and air quick-cut valve 7 that are judged to be possibly leaking abnormally based on the change in flow rate, the flue gas quick-cut valve 6 and air quick-cut valve 7 that are judged to be possibly leaking abnormally based on the abnormal flue gas temperature, and the flue gas quick-cut valve 6 and air quick-cut valve 7 that are judged to be possibly leaking abnormally based on the rotatable angle measurement.

[0049] Step S6 involves finding the intersection of the flue gas quick-cut valve 6 and air quick-cut valve 7, which are identified as potentially leaking abnormally using the three different methods. If both valves simultaneously satisfy the condition that they are identified as potentially leaking abnormally by all three methods, then a leak is inevitable. By finding the intersection of these three methods, the leaking air quick-cut valve 7 and flue gas quick-cut valve 6 in the regenerative heating furnace can be quickly identified and addressed accordingly, thereby ensuring normal combustion of the burner 2 and shortening the troubleshooting time.

[0050] In some implementations, the opening and closing of each flue gas quick-cut valve 6 and air quick-cut valve 7 can be automatically controlled by a program. To adapt to existing equipment, as one implementation, before steps S2 and 2', the method for judging leakage of the quick-cut valve of the regenerative heating furnace further includes: setting the control mode of both the air valve group and the flue gas quick-cut valve group to manual control. At this time, the flow rate of the air regulating valve 4 or the flue gas regulating valve 5 on the main pipeline 3 does not change, and subsequent manual closure is used to ensure accurate closure.

[0051] In a preferred embodiment, in step S1, the air regulating valve 4 on the main pipeline 3 is adjusted to a preset opening degree, specifically including: adjusting the flow opening degree of the air regulating valve 4 to 80% to 100%. Similarly, preferably, in step S1', the flue gas regulating valve 5 on the main pipeline 3 is adjusted to a preset opening degree, specifically including: adjusting the flow opening degree of the flue gas regulating valve 5 to 80% to 100%.

[0052] In summary, this invention, by sequentially closing the air quick-cut valve 7 and flue gas quick-cut valve 6 of each burner 2, observes whether the flow rate decreases proportionally. After recording the flow rate change, the air quick-cut valve 7 and flue gas quick-cut valve 6 of this burner 2 are restored to the open state, and then the air quick-cut valve 7 and flue gas quick-cut valve 6 of the next burner 2 are closed, until the changes after closing the air quick-cut valve 7 and flue gas quick-cut valve 6 of all burners 2 in that section are recorded. By comparing the ratio of the flow rate after closing the air quick-cut valve 7 and flue gas quick-cut valve 6 to the corresponding initial flow rate L / initial flow rate M, and comparing it with the ratio 1 / n of the flue gas quick-cut valve group / quick-cut valve group, it is possible to quickly determine whether there is abnormal leakage or abnormal air leakage in the flue gas quick-cut valve 6 and air quick-cut valve 7. Furthermore, the burner 2 that overlaps in the screening results obtained through the above three methods is guaranteed to leak gas. This solves the calculation problems of being unable to determine air leakage when checking burner 2 of the regenerative heating furnace, and the slow speed and efficiency of the investigation. This ensures that the regenerator box 1 and burner 2 can quickly recover and maintain normal combustion, improves combustion efficiency, reduces smoke from the furnace tail, ensures the atmosphere inside the furnace, reduces slab oxidation loss by about 0.05%, and ensures the air-fuel ratio of burner 2, reducing gas consumption by about 2%.

[0053] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0054] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for judging a leakage of a quick cut valve of a regenerative heating furnace, characterized by, The method comprises the following steps: Step S1, adjusting the air regulating valve on the main pipeline to a preset opening degree; Step S2, closing all the groups of air quick switching valves on the branch pipelines, and fully opening the n air quick switching valves in the group of air quick switching valves to obtain an initial section flow L of the air regulating valve; each air quick switching valve is operated in turn for inspection, the flow values corresponding to the air regulating valves are monitored and recorded, the flow variation parameters corresponding to the air quick switching valves are calculated according to the n flow values and the initial section flow L, and if the flow variation parameters do not satisfy a preset error interval, it is judged that the corresponding air quick switching valve may have a leakage abnormality; Before or after step S2, the leakage judgment method of the regenerative heating furnace quick switching valve further comprises: Step S1', adjusting the flue gas regulating valve on the main pipeline to a preset opening degree; Step S2', closing all the groups of air quick switching valves on the branch pipelines, and fully opening the n flue gas quick switching valves in the group of flue gas quick switching valves to obtain an initial section flow M of the flue gas regulating valve; each flue gas quick switching valve is operated in turn, the flow values corresponding to the flue gas regulating valves are monitored and recorded, the flow variation parameters corresponding to the flue gas quick switching valves are calculated according to the n flow values and the initial section flow M, and if the flow variation parameters do not satisfy a preset error interval, it is judged that the corresponding flue gas quick switching valve may have a leakage abnormality; Step S2 specifically comprises: switching one of the air quick switching valves to a fully closed state, keeping the rest of the air quick switching valves in a fully open state, recording the flow value of the air regulating valve on the main pipeline at this time as the flow data of the air quick switching valve in the fully closed state, and then switching the air quick switching valve from the fully closed state to the fully open state; n flow values are obtained by operating the other air quick switching valves in this way; if the ratio of the flow value to the initial section flow L is greater than (n-1) / n, it is judged that the air quick switching valve corresponding to the state change of the flow value may have a leakage abnormality; Step S3, monitoring the flue gas temperature of each regenerative chamber under normal working conditions, and if the flue gas temperature is reduced to less than a first preset temperature or increased to greater than a second preset temperature, it is judged that the air quick switching valve or the flue gas quick switching valve corresponding to the regenerative chamber may have a leakage abnormality; The judgment that the air quick switching valve or the flue gas quick switching valve corresponding to the regenerative chamber may have a leakage abnormality specifically comprises: judging that the air quick switching valve corresponding to the regenerative chamber with a flue gas temperature lower than 100℃ may have a leakage abnormality; and judging that the flue gas quick switching valve corresponding to the regenerative chamber with a flue gas temperature higher than 230℃ may have a leakage abnormality; Step S4, checking whether the air quick switching valve or the flue gas quick switching valve corresponding to each air quick switching valve and flue gas quick switching valve has a rotatable angle range, and if the air quick switching valve or the flue gas quick switching valve has a rotatable angle range and the rotatable angle range is greater than a preset value, it is judged that the air quick switching valve or the flue gas quick switching valve may have a leakage abnormality; Step S5, recording the flue gas quick switching valve and the air quick switching valve judged as possibly having a leakage abnormality by the section flow variation, the flue gas quick switching valve and the air quick switching valve judged as possibly having a leakage abnormality by the flue gas temperature abnormality, and the flue gas quick switching valve and the air quick switching valve judged as possibly having a leakage abnormality by the rotatable angle range. Step S6, intersecting the flue gas quick cut valve and the air quick cut valve judged as possible leakage abnormality by the above three different ways, and satisfying that the flue gas quick cut valve / air quick cut valve judged as possible leakage abnormality by the three ways must exist leakage problem.

2. The method of claim 1, wherein The method further comprises: checking whether the corresponding proximity switch stop iron of each flue gas quick cut valve and air quick cut valve has a rotatable angle range, specifically comprising: swinging the proximity switch stop iron up and down along the activity direction of the proximity switch stop iron, if the rotatable angle range of the proximity switch stop iron is greater than 15°, it is judged that the corresponding flue gas quick cut valve or air quick cut valve may exist leakage abnormality.

3. The method according to claim 1 or 2, wherein Before the step S2 and the step S2', the heat accumulating type heating furnace quick cut valve leakage judgment method further comprises: The control modes of the air valve group and the flue gas quick cut valve group are both set to manual control, at this time, the section flow of the air regulating valve or the flue gas regulating valve on the main pipeline has no change.

4. The method of claim 1 or 2, wherein In step S1, the air regulating valve on the main pipeline is adjusted to a preset opening, specifically comprising: adjusting the flow opening of the air regulating valve to 80%-100%. In step S1, the air regulating valve on the main pipeline is adjusted to a preset opening, specifically comprising: adjusting the flow opening of the air regulating valve to 80%-100%.

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