Annealing furnace gas partition monitoring device and monitoring method and annealing furnace

Abstract

The invention discloses an annealing furnace gas partition monitoring device and method and an annealing furnace, the annealing furnace gas partition monitoring device comprises a gas supply pipeline used for supplying gas to the annealing furnace, and the gas supply pipeline is provided with a first on-off valve and a second on-off valve which are sequentially arranged in the gas circulation direction, the gas supply pipeline is provided with a pressure sensor for detecting the gas pressure in a pipeline between the first opening and closing valve and the second opening and closing valve; the nitrogen pipeline is used for supplying nitrogen to the annealing furnace, the nitrogen pipeline is communicated with the gas supply pipeline and located between the first on-off valve and the second on-off valve, and the nitrogen pipeline is provided with a third on-off valve; and the controller is electrically connected with the pressure sensor.

Description

Technical Field

[0001] This application belongs to the field of annealing furnace technology, specifically relating to an annealing furnace gas isolation monitoring device and monitoring method, and an annealing furnace. Background Technology

[0002] The annealing furnace is a central link in steel production and is the core component for achieving stable control of product performance and quality. During operation, the furnace generates heat through the combustion of internal gas. When maintenance or troubleshooting is required, nitrogen must be used to purge the pipelines and the gas inside the furnace. During maintenance or troubleshooting, the valves on the gas supply pipeline must be kept in a properly closed state to prevent gas from entering the furnace through the gas supply pipeline.

[0003] In related technologies, two valves connected in series are installed on the gas supply pipeline to ensure a sealing effect. However, sometimes the valve closer to the gas source does not seal properly, which poses a fire risk when the valve farther from the sealing source is opened. Summary of the Invention

[0004] To address the technical problem of fire risk when valves located far from the sealing source are opened, this application provides a gas isolation monitoring device and monitoring method for annealing furnaces, as well as an annealing furnace.

[0005] In a first aspect of this application, a gas isolation monitoring device for an annealing furnace is provided, comprising: A gas supply pipeline is used to supply gas to an annealing furnace. The gas supply pipeline is equipped with a first on-off valve and a second on-off valve arranged sequentially along the gas flow direction. The gas supply pipeline is also equipped with a pressure sensor for detecting the gas pressure in the pipeline between the first on-off valve and the second on-off valve. A nitrogen pipeline is used to supply nitrogen to the annealing furnace. The nitrogen pipeline is connected to the gas supply pipeline and is located between the first on-off valve and the second on-off valve. The nitrogen pipeline is provided with a third on-off valve. The controller is electrically connected to the pressure sensor.

[0006] In some embodiments, the pressure sensor is a mobile pressure transmitter, which is installed on the third on / off valve, which is located near the gas supply line; the pressure transmitter communicates wirelessly with the controller.

[0007] In some embodiments, the gas supply line is equipped with a pressure regulating valve, which is located near the output end of the second on / off valve.

[0008] In some embodiments, the pressure regulating valve is an electrically controlled valve, and the controller is electrically connected to the electrically controlled valve.

[0009] In some embodiments, the first on / off valve and the second on / off valve are connected, and the controller is electrically connected to the first on / off valve and the second on / off valve.

[0010] In some implementations, the first on / off valve is a butterfly valve.

[0011] In some embodiments, the second on / off valve is a blind valve.

[0012] In a second aspect of this application, an annealing furnace is provided, comprising: Furnace body, The first aspect of the annealing furnace gas isolation monitoring device, wherein the output end of the gas supply pipeline is connected to the furnace body.

[0013] In a third aspect of this application, a method for monitoring the gas isolation of an annealing furnace is provided, applicable to the gas isolation monitoring device of the annealing furnace in the first aspect. The isolation method includes the following steps: When the annealing furnace is shut down, the first on / off valve is closed and the third on / off valve is opened. Nitrogen gas enters the annealing furnace through the third on / off valve and the second on / off valve in sequence to replace the gas in the annealing furnace. When the replacement is completed, the second opening and closing valve is closed. If the pressure detected by the pressure sensor is higher than the set value, the first opening and closing valve is adjusted until the pressure detected by the pressure sensor is not higher than the set value. After the annealing furnace shutdown operation is completed, the second on / off valve is opened, the third on / off valve is closed, and then the first on / off valve is opened, so that the gas enters the annealing furnace through the gas supply pipeline.

[0014] In some implementations, the set value is 0.9 kPa to 1.1 kPa.

[0015] The annealing furnace gas isolation monitoring device provided according to the embodiments of this application includes a gas supply pipeline, a nitrogen pipeline, and a controller. The gas supply pipeline is used to supply gas to the annealing furnace. The gas supply pipeline is provided with a first on-off valve and a second on-off valve arranged sequentially along the gas flow direction. The gas supply pipeline is also provided with a pressure sensor for detecting the gas pressure in the pipeline between the first on-off valve and the second on-off valve. The nitrogen pipeline is used to supply nitrogen to the annealing furnace. The nitrogen pipeline is connected to the gas supply pipeline and is located between the first on-off valve and the second on-off valve. The nitrogen pipeline is provided with a third on-off valve. The controller is electrically connected to the pressure sensor.

[0016] A pressure sensor detects the gas pressure in the pipeline between the first and second on / off valves, thus determining whether the first on / off valve is not closing tightly, causing gas leakage. Specifically, after purging the gas in the annealing furnace and gas supply pipeline using a nitrogen pipeline, the second on / off valve is closed. This ensures the pressure in the pipeline between the first and second valves is the same as the nitrogen pressure. If the first on / off valve is not closing tightly, gas will enter the pipeline between the first and second valves, causing the pressure sensor to detect a pressure exceeding the set value. In this case, the first on / off valve needs adjustment to improve its sealing performance. After observing for a period of time, if the gas pressure no longer changes, it is determined that the first on / off valve is not leaking. At this point, the second on / off valve can be opened, followed by closing the third on / off valve sequentially and opening the first on / off valve to supply gas to the annealing furnace.

[0017] By detecting the gas pressure in the pipeline between the first and second on / off valves using a pressure sensor, the sealing performance of the second on / off valve is monitored, reducing the risk of fire when the second on / off valve is opened, improving the inherent safety of the blind valve opening during the start-up stage of the annealing furnace, and eliminating personnel safety risks. Attached Figure Description

[0018] Figure 1 A schematic diagram of the annealing furnace gas isolation monitoring device of this application is shown.

[0019] Explanation of reference numerals in the attached figures: 10-Gas supply line; 11-First on / off valve; 12-Second on / off valve; 20-Nitrogen line; 21-Third on / off valve; 22-Pressure sensor; 30-Controller. Detailed Implementation

[0020] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] The first aspect of this application provides a gas isolation monitoring device for an annealing furnace, which improves the inherent safety of the blind valve opening during the start-up stage of the annealing furnace and eliminates the safety risks to personnel.

[0022] This application is described below with reference to the accompanying drawings and specific embodiments: Please see Figure 1The annealing furnace gas isolation monitoring device provided in this application includes a gas supply pipeline 10, a nitrogen pipeline 20, and a controller 30. The gas supply pipeline 10 is used to supply gas to the annealing furnace. The gas supply pipeline 10 is provided with a first on-off valve 11 and a second on-off valve 12 arranged sequentially along the gas flow direction. The gas supply pipeline 10 is also provided with a pressure sensor 22 for detecting the gas pressure in the pipeline between the first on-off valve 11 and the second on-off valve 12. The nitrogen pipeline 20 is used to supply nitrogen to the annealing furnace. The nitrogen pipeline 20 is connected to the gas supply pipeline 10 and is located between the first on-off valve 11 and the second on-off valve 12. The nitrogen pipeline 20 is provided with a third on-off valve 21. The controller 30 is electrically connected to the pressure sensor 22.

[0023] The input end of the gas supply pipeline 10 is connected to a gas source, which can be coke oven gas, blast furnace gas, or natural gas, etc., to supply gas to the annealing furnace. The combustion of the gas provides heat to the annealing furnace. The first on / off valve 11 and the second on / off valve 12 on the gas supply pipeline 10 are two valves, which can improve the stability of gas cutoff in the gas supply pipeline 10 and reduce the risk of gas leakage into the annealing furnace. Generally, the second on / off valve 12 is a blind valve. If gas leaks through the first on / off valve 11 into the pipeline between the first on / off valve 11 and the second on / off valve 12, opening the blind valve may pose a fire risk.

[0024] Nitrogen line 20 is connected to gas supply line 10, so nitrogen line 20 can supply nitrogen to the annealing furnace through gas supply line 10 to replace the gas in the annealing furnace and gas supply line 10. This can improve the safety of maintaining or troubleshooting the annealing furnace.

[0025] Pressure sensor 22 detects the gas pressure in the pipeline between the first on / off valve 11 and the second on / off valve 12, thereby determining whether the first on / off valve 11 is not properly closed, resulting in gas leakage. Specifically, after replacing the gas in the annealing furnace and the gas supply pipeline 10 with nitrogen pipeline 20, the second on / off valve 12 is closed. This ensures that the pressure in the pipeline between the first on / off valve 11 and the second on / off valve 12 is the same as the nitrogen pressure. If the first on / off valve 11 is not properly closed, gas will enter the pipeline between the first on / off valve 11 and the second on / off valve 12, and the gas pressure detected by pressure sensor 22 will exceed the set value. In this case, the first on / off valve 11 needs to be adjusted to improve its sealing performance. After observing for a period of time, if the gas pressure no longer changes, it is determined that the first on / off valve 11 is not leaking. At this point, the second on / off valve 12 can be opened, and then the third on / off valve 21 can be closed sequentially, and the first on / off valve 11 can be opened to send gas into the annealing furnace.

[0026] The gas pressure in the pipeline between the first on / off valve 11 and the second on / off valve 12 is detected by the pressure sensor 22 to monitor the sealing performance of the second on / off valve 12 and reduce the risk of fire when the second on / off valve 12 is opened.

[0027] In some embodiments, the pressure sensor 22 can be a portable pressure transmitter, which is mounted on the third on / off valve 21, close to the gas supply line 10. Using a portable pressure transmitter is cost-effective. In other embodiments, other types of pressure sensors 22 may be used, and this application is not limiting.

[0028] When a mobile pressure transmitter is selected for pressure sensor 22, the mobile pressure sensor 22 can be installed on the third opening and closing valve 21 when it is necessary to detect the gas pressure in the pipeline between the first opening and closing valve 11 and the second opening and closing valve 12. When gas is continuously supplied to the annealing furnace, the mobile pressure transmitter can be removed, and it is not necessary to continuously install the mobile pressure transmitter on the third opening and closing valve 21.

[0029] The pressure transmitter and controller 30 can be electrically connected using a wiring harness. In other embodiments, the pressure transmitter can also communicate wirelessly with the controller 30 without the need for a wiring harness, thus saving space.

[0030] The first on / off valve 11 can be a butterfly valve, and the second on / off valve 12 can be a blind valve. Both the butterfly valve and the blind valve are electrically controlled valves. The controller 30 is electrically connected to the first on / off valve 11 and the second on / off valve 12 to realize the automatic opening and closing of the butterfly valve and the blind valve.

[0031] In some embodiments, the gas supply line 10 may be equipped with a pressure regulating valve located near the output end of the second on / off valve 12. The pressure regulating valve can regulate the pressure of the gas, thereby adjusting the gas combustion flame and controlling the heating temperature of the annealing furnace.

[0032] Based on the same technical concept as the first aspect, the second aspect of this application provides an annealing furnace.

[0033] The annealing furnace provided in this application includes a furnace body and an annealing furnace gas isolation monitoring device according to any embodiment of the first aspect.

[0034] The output end of the gas supply line 10 is connected to the furnace body to provide combustion gas for heating the annealing furnace.

[0035] Based on the same technical concept as the first aspect, a third aspect of this application provides a method for monitoring the gas isolation of an annealing furnace. The gas isolation monitoring method for an annealing furnace provided in this application is applicable to the gas isolation monitoring device for an annealing furnace in any embodiment of the first aspect.

[0036] The gas isolation monitoring method for annealing furnaces provided in this application includes the following steps: Step 1: Shut down the annealing furnace, close the first on / off valve 11, open the third on / off valve 21, and nitrogen gas enters the annealing furnace through the third on / off valve 21 and the second on / off valve 12 in sequence to replace the gas in the annealing furnace. Step 2: When the replacement is complete, close the second on / off valve 12. If the pressure detected by the pressure sensor 22 is higher than the set value, adjust the first on / off valve 11 until the pressure detected by the pressure sensor 22 is not higher than the set value. Step 3: After the annealing furnace shutdown operation is completed, open the second on / off valve 12, close the third on / off valve 21, and then open the first on / off valve 11 to allow the gas to enter the annealing furnace through the gas supply pipeline 10.

[0037] If a strip breaks in the annealing furnace or if the furnace needs to be shut down for maintenance, closing the first on / off valve 11 will stop the gas supply. Opening the third on / off valve 21 allows nitrogen gas to enter the annealing furnace through the third on / off valve 21 and the second on / off valve 12, i.e., through the gas supply pipeline 10, to release the gas.

[0038] After the nitrogen purging of the coal gas is completed, the second on / off valve 12 is closed. At this point, the first on / off valve 11 and the second on / off valve 12 act as two lines of defense, reducing the risk of coal gas leakage into the annealing furnace. The annealing furnace is now filled with nitrogen, allowing operators to handle belt breakage issues or perform maintenance on the furnace.

[0039] If the first valve 11 fails to seal properly during troubleshooting or maintenance, gas may enter the pipeline between the first and second valves 11 and 12. Opening the second valve after the troubleshooting or maintenance is completed poses a fire risk. During troubleshooting or maintenance, the gas pressure in the pipeline between the first and second valves 11 is monitored by the pressure sensor 22. If the gas pressure exceeds a set value, it indicates a gas leak into the pipeline between the first and second valves 11 and 12. The first valve 11 needs to be addressed, and the gas in the pipeline between the first and second valves 11 needs to be released before the second valve 12 can be opened. If the gas pressure does not exceed the set value, it indicates no gas leak into the pipeline between the first and second valves 11 and 12, and the second valve 12 can be opened normally.

[0040] By monitoring the gas pressure in the pipeline between the first on / off valve 11 and the second on / off valve 12 using the pressure sensor 22, the safety of the opening process of the second on / off valve 12 is improved and the risk of fire is reduced.

[0041] In some embodiments, the setpoint can be 0.9 kPa to 1.1 kPa, such as 0.95 kPa, 0.96 kPa, 0.97 kPa, 0.98 kPa, 1.0 kPa, 1.02 kPa, 1.04 kPa, 1.06 kPa, 1.08 kPa, or 1.09 kPa. The setpoint can be determined based on the nitrogen pressure, and this application does not impose any limitations on it. In other embodiments, the setpoint can also be 1.5 kPa or 2 kPa, etc.

[0042] This application provides a gas isolation monitoring device and monitoring method for a common annealing furnace. The annealing furnace has at least the following advantages: (1) By using the automatic detection interlock design, the air tightness of the pipeline valves is guaranteed and there is no abnormal gas leakage before the ignition and start-up operations are carried out, thus achieving the inherent safety of the blind valve opening during the start-up stage and eliminating the safety risks of personnel operation.

[0043] (2) The pressure sensor 22 is a wireless portable pressure transmitter, which can be applied to multiple locations, saving costs while achieving intrinsic safety in a more flexible and convenient way.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0046] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0048] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A gas isolation monitoring device for an annealing furnace, characterized in that, include: A gas supply pipeline is used to supply gas to an annealing furnace. The gas supply pipeline is equipped with a first on-off valve and a second on-off valve arranged sequentially along the gas flow direction. The gas supply pipeline is also equipped with a pressure sensor for detecting the gas pressure in the pipeline between the first on-off valve and the second on-off valve. A nitrogen pipeline is used to supply nitrogen to the annealing furnace. The nitrogen pipeline is connected to the gas supply pipeline and is located between the first on-off valve and the second on-off valve. The nitrogen pipeline is provided with a third on-off valve. The controller is electrically connected to the pressure sensor.

2. The annealing furnace gas isolation monitoring device according to claim 1, characterized in that, The pressure sensor is a mobile pressure transmitter, which is installed on the third on / off valve, which is close to the gas supply line; the pressure transmitter communicates wirelessly with the controller.

3. The annealing furnace gas isolation monitoring device according to claim 1, characterized in that, The gas supply line is equipped with a pressure regulating valve, which is located near the output end of the second on / off valve.

4. The annealing furnace gas isolation monitoring device according to claim 3, characterized in that, The pressure regulating valve is an electrically controlled valve, and the controller is electrically connected to the electrically controlled valve.

5. The annealing furnace gas isolation monitoring device according to any one of claims 1-4, characterized in that, The first on / off valve and the second on / off valve, and the controller is electrically connected to the first on / off valve and the second on / off valve.

6. The annealing furnace gas isolation monitoring device according to any one of claims 1-4, characterized in that, The first on / off valve is a butterfly valve.

7. The annealing furnace gas isolation monitoring device according to any one of claims 1-4, characterized in that, The second on / off valve is a blind valve.

8. An annealing furnace, characterized in that, include: Furnace body, The annealing furnace gas isolation monitoring device according to any one of claims 1-7, wherein the output end of the gas supply pipeline is connected to the furnace body.

9. A method for monitoring the gas isolation of an annealing furnace, applicable to the gas isolation monitoring device for an annealing furnace as described in any one of claims 1-7, characterized in that, The isolation method includes the following steps: When the annealing furnace is shut down, the first on / off valve is closed and the third on / off valve is opened. Nitrogen gas enters the annealing furnace through the third on / off valve and the second on / off valve in sequence to replace the gas in the annealing furnace. When the replacement is completed, the second opening and closing valve is closed. If the pressure detected by the pressure sensor is higher than the set value, the first opening and closing valve is adjusted until the pressure detected by the pressure sensor is not higher than the set value. After the annealing furnace shutdown operation is completed, the second on / off valve is opened, the third on / off valve is closed, and then the first on / off valve is opened, so that the gas enters the annealing furnace through the gas supply pipeline.

10. The method for monitoring the gas isolation of an annealing furnace according to claim 9, characterized in that, The set value is 0.9 kPa to 1.1 kPa.

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