Annealing furnace burner and method for off-line adjustment of pressure balance of an annealing furnace burner

Abstract

The present application relates to a kind of annealing furnace burner and the method for adjusting the pressure balance of annealing furnace burner offline, comprising: S1, in offline state, close valve group, into debugging gas to the part of each section gas pipeline between valve group and burner body;S2, measure the pressure of debugging gas at each burner body, and obtain pressure average;S3, adjust the pressure of corresponding gas pipeline by adjusting mechanism, to adjust the pressure at each burner body to the direction close to pressure average;S4, set a specified difference, again measure the pressure of debugging gas at each burner body, if the maximum difference between the pressure of each burner body is less than or equal to specified difference, adjustment is ended, if the maximum difference between the pressure of each burner body is greater than specified difference, repeat step S3, S4, until the difference between the pressure of each burner body is less than or equal to specified difference. By the way of offline adjustment, the accuracy of the adjustment of the present application is higher.

Description

Technical Field

[0001] This invention relates to the technical field of annealing furnaces, and in particular to an annealing furnace burner and a method for offline adjustment of the annealing furnace burner pressure balance. Background Technology

[0002] Metal materials produced on the production line enter an annealing furnace for annealing. The furnace heats the metal by supplying gas to burners; a typical annealing furnace contains 150 burners. Uneven gas flow rates to multiple burners will result in uneven temperature distribution within the furnace, affecting the annealing effect. Therefore, the gas flow rates to the burners must be balanced to achieve a good annealing result; that is, each burner must receive the same flow rates of gas and combustion air to ensure uniform temperature within the furnace and, consequently, uniform heating of the sheet metal.

[0003] Existing methods for balancing burner flow in annealing furnaces are susceptible to fluctuations in production line operation. When the rate at which the metal material produced on the production line enters the annealing furnace fluctuates, the flow rate of each burner also fluctuates, affecting the accuracy of burner flow balance. Summary of the Invention

[0004] In order to improve the accuracy of flow balance of annealing furnace burners, this application provides an annealing furnace burner.

[0005] The annealing furnace burner provided by this invention adopts the following technical solution:

[0006] An annealing furnace burner includes a burner body and a gas pipeline; one end of the gas pipeline is connected to the burner body, and the other end is connected to a gas source; the gas pipeline is equipped with a solenoid valve and a safety valve for controlling the on / off state of the gas pipeline, the solenoid valve and the safety valve controlling the on / off state of the gas pipeline individually or jointly; the gas pipeline is equipped with an adjustment mechanism for fine-tuning the internal flow rate of the gas pipeline.

[0007] Optionally, the solenoid valve is located in a section of the gas pipeline between the solenoid valve and the burner, where the solenoid valve has a pressure tap, allowing fluid to enter from the pressure tap.

[0008] Optionally, the fluid is introduced into the pressure tap through a pressure reducing valve.

[0009] Optionally, a flow meter is connected between the pressure reducing valve and the pressure tapping port.

[0010] Optionally, the adjusting mechanism is a needle valve.

[0011] Based on the above concept, the present invention also provides an annealing furnace, which includes a plurality of the above-described annealing furnace burners and a combustion chamber, wherein the burner bodies of the plurality of annealing furnace burners are uniformly distributed in the combustion chamber.

[0012] Based on the above concept, the present invention also provides a method for offline adjustment of burner flow balance in an annealing furnace. This method is applied to the aforementioned annealing furnace and includes the following steps:

[0013] S1. In offline mode, close the solenoid valve and introduce test gas into the section of the gas pipeline between the solenoid valve and the burner body.

[0014] S2. Measure the pressure of the test gas at each burner body and calculate the average pressure.

[0015] S3. The pressure of the corresponding gas pipeline is adjusted by the adjustment mechanism to adjust the pressure at each burner body towards the average pressure.

[0016] S4. Set a specified difference value, and measure the pressure of the adjustment gas at each burner body again. If the maximum difference between the pressures of each burner body is less than or equal to the specified difference value, the adjustment ends. If the maximum difference between the pressures of each burner body is greater than the specified difference value, repeat steps S2 and S3 until the difference between the pressures of each burner body is less than or equal to the specified difference value.

[0017] Optionally, the test gas is nitrogen or compressed air.

[0018] Optionally, measuring the pressure of the test gas at each burner body specifically involves measuring the pressure of the test gas at each burner using an orifice flow meter or a differential pressure gauge.

[0019] Optionally, the specified difference is between 0 Pa and 20 Pa.

[0020] As described above, the present invention has at least the following beneficial effects:

[0021] 1. Compared with existing methods for balancing burner flow in annealing furnaces, the offline method for adjusting burner pressure balance in this invention is performed offline. On the one hand, the burner flow balance adjustment is not affected by the production line's operating conditions, avoiding repeated measurements caused by production line speed increases or decreases. On the other hand, since the annealing furnace is in a extinguished state with a lower temperature during offline flow balance adjustment, it effectively prevents workers performing burner flow balance operations from being exposed to high-temperature working environments for extended periods, thus benefiting their health and safety.

[0022] 2. By using a test gas instead of the mixture of fuel gas and combustion-supporting gas, the flow rate balance of each burner is tested. Since the annealing furnace is offline, the burners cannot be ignited. Therefore, using test gas instead of the mixture of fuel gas and combustion-supporting gas ensures safety during flow rate measurement.

[0023] 3. Before entering the gas pipeline, the test gas passes through a flow meter and a pressure reducing valve, allowing staff to intuitively and conveniently adjust the pressure of the test gas entering each section of the gas pipeline to be the same, thereby eliminating the impact of different pressures of the test gas entering each gas pipeline on the accuracy of the burner flow balance results. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the positional relationship between the gas pipeline, burner body, solenoid valve, safety valve, and regulating mechanism in an embodiment of the present invention.

[0025] Figure 2 This is a flowchart illustrating the implementation process of a method for offline adjustment of burner flow balance in an annealing furnace, as described in an embodiment of the present invention.

[0026] Attached reference numerals: 1. Gas pipeline; 2. Burner body; 3. Solenoid valve; 4. Safety valve; 5. Adjustment mechanism. Detailed Implementation

[0027] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. It should also be understood that the terminology used in the embodiments of the present invention is for describing specific implementation schemes and not for limiting the scope of protection of the present invention. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0028] Please see Figure 1 , Figure 2It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness or purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0029] Please see Figure 1 The present invention provides an annealing furnace burner, comprising: a burner body 2 and a gas pipeline 1. One end of the gas pipeline 1 is connected to the burner body 2, and the other end is connected to a gas source. A valve assembly is provided on the gas pipeline 1 to control the on / off state of the gas pipeline 1, allowing adjustment gas to pass through the valve assembly into a section of the gas pipeline located between the valve assembly and the burner body 2. A regulating mechanism 5 for adjusting the flow rate of the gas pipeline 1 is also provided in the section of the gas pipeline 1 located between the valve assembly and the burner body 2.

[0030] The present invention also provides an annealing furnace, which includes a plurality of the above-described annealing furnace burners and a combustion chamber. The plurality of burner bodies 2 are evenly distributed in the combustion chamber.

[0031] The working principle of the annealing furnace described above is as follows: Gas is delivered via gas pipeline 1 to the burner body 2 and ignited, heating the metal material inside the furnace. Gas pipeline 1 is controlled by a solenoid valve 3. Multiple burner bodies 2 are evenly distributed within the annealing furnace, ensuring uniform heating of the metal material and achieving a better annealing effect.

[0032] Please see Figure 2 The present invention provides a method for offline adjustment of burner pressure balance in an annealing furnace, the method being applied to the aforementioned annealing furnace, comprising:

[0033] S1. In offline mode, close the valve group and introduce test gas into the section of each gas pipeline located between the valve group and the burner body;

[0034] S2. Measure the pressure of the test gas at each burner body and calculate the average pressure.

[0035] S3. Adjust the pressure of the corresponding gas pipeline through the adjustment mechanism to adjust the pressure at each burner body towards the average pressure.

[0036] S4. Set a specified difference value, and measure the pressure of the adjustment gas at each burner body again. If the maximum difference between the pressures of each burner body is less than or equal to the specified difference value, the adjustment is over. If the maximum difference between the pressures of each burner body is greater than the specified difference value, repeat steps S2 and S3 until the difference between the pressures of each burner body is less than or equal to the specified difference value.

[0037] Specifically, for step S1, "offline state" means that the annealing furnace is in a stopped state and the metal materials produced in the production line will not enter the annealing furnace.

[0038] Compared with existing methods for balancing burner flow in annealing furnaces, the offline method for adjusting burner pressure balance in this invention is performed offline. On one hand, the burner body 2 is not affected by the operating conditions of the production line when adjusting flow balance, avoiding repeated measurements caused by speed increases or decreases in the production line. On the other hand, since the annealing furnace is in a extinguished state and the temperature is low when adjusting burner flow balance offline, it effectively prevents workers performing burner flow balancing operations from being exposed to high-temperature working environments for extended periods, thus benefiting their health and safety.

[0039] When the annealing furnace is offline, close the valve group that controls the on / off of the gas pipeline 1 so that the gas cannot enter the part of the gas pipeline 1 located between the valve group and the burner body 2. Then, introduce test gas into this part. When the test gas flows out from each burner body 2, its pressure or flow rate can be measured.

[0040] Specifically, in the offline adjustment method for balancing the burner pressure of the annealing furnace of the present invention, a test gas is used instead of the mixture of fuel gas and combustion-supporting gas to test whether the flow rate of each burner body 2 is balanced. Since the annealing furnace is offline, the burner body 2 cannot be ignited and burned. Therefore, using a test gas instead of the mixture of fuel gas and combustion-supporting gas can ensure the safety of flow rate measurement.

[0041] More specifically, the test gas can be compressed air or nitrogen. On the one hand, both compressed air and nitrogen are relatively stable gases, making them safer as test gases. On the other hand, the combustion-supporting gas is air itself, and nitrogen is also a major component of air. Therefore, compressed air and nitrogen have the same or similar composition as the combustion-supporting gas, which can reduce the difference in measurement results caused by different gas compositions and help improve the accuracy of burner flow balance adjustment.

[0042] Please continue to refer to Figure 1 The valve assembly includes a solenoid valve 3 and a safety valve 4, which can control the opening and closing of the gas pipeline 1 individually or together. The safety valve 4 is located on the side of the solenoid valve 3 away from the burner body 2.

[0043] Specifically, the test gas is introduced into the gas pipeline 1 from the portion located between the solenoid valve 3 and the burner body 2. Closing the solenoid valve 3 prevents gas from entering this section of the gas pipeline 1, or allows gas to leave this section and mix with other gases. However, the solenoid valve 3 may not always be completely airtight. Therefore, the annealing furnace burner of this invention adds a safety valve 4 to the portion of the gas pipeline 1 away from the burner body 2 and the solenoid valve 3. This safety valve 4 can also close the gas pipeline 1. Together with the solenoid valve 3, the safety valve 4 controls the opening and closing of the gas pipeline 1, further reducing the possibility of gas entering the portion of the gas pipeline 1 between the solenoid valve 3 and the burner body 2, or leaking from this section of the gas pipeline 1. This improves the safety when using the offline pressure balance adjustment method for the annealing furnace burner of this invention. Preferably, in this embodiment, the safety valve 4 is a manual valve.

[0044] If the test gas needs to be input into the section of gas pipeline 1 between the solenoid valve 3 and the burner body 2, an input port can be opened on this section of gas pipeline 1, and then the test gas can be input into gas pipeline 1 through the input port.

[0045] The above method requires modification of the gas pipeline 1, resulting in low safety and sealing performance. However, the solenoid valve 3 has a pressure tap, which is an opening used to measure the pressure of the fluid passing through it. This pressure tap is connected to the inside of the solenoid valve 3, and thus also connects to the gas pipeline 1. Fluid can enter the gas pipeline 1 through the pressure tap. Since the test gas is also a fluid, it can also enter the gas pipeline 1 through the pressure tap. By introducing the test gas into the gas pipeline 1 through the pressure tap, no modification to the gas pipeline 1 is required, avoiding safety and sealing issues caused by modification. This further improves the accuracy of the offline adjustment method for annealing furnace burner pressure balance.

[0046] In practical applications, the test gas introduced into each gas pipeline 1 is output from the same gas source. However, due to pipeline limitations, the actual flow rate of the test gas at the pressure tap may differ, which can easily lead to deviations in the adjustment results. To ensure that the flow rate of the test gas introduced into each gas pipeline 1 is the same, the test gas is introduced into the pressure tap through a pressure reducing valve.

[0047] Specifically, a pressure reducing valve is a valve that reduces the inlet pressure to a desired outlet pressure through adjustment, and automatically maintains a stable outlet pressure by relying on the energy of the medium itself. Therefore, by setting the outlet pressure of each pressure reducing valve to the same pressure, the pressure of the test gas entering each gas pipeline 1 is the same, and when the pressure is the same, the flow rate of the test gas is also the same. This eliminates the influence of different pressures of the test gas entering each gas pipeline 1 on the accuracy of the flow balance result of the burner body 2.

[0048] Furthermore, when using the offline adjustment method for balancing the burner pressure of the annealing furnace according to the present invention, a flow meter is also connected between the pressure reducing valve and the corresponding pressure tap. The flow meter allows for direct observation and adjustment of the flow rate within the pressure reducing valve, thereby improving the ease of implementation of the offline adjustment method for balancing the burner pressure of the annealing furnace according to the present invention.

[0049] For steps S2 and S3, "making the pressure in gas pipeline 1 approach or equal to the average pressure" means reducing the pressure value above the average and increasing the pressure value below the average, thereby bringing the pressure at each burner body 2 closer to the average value. Ideally, the pressure at each burner body 2 would be adjusted to equal the average pressure, and the pressures of all burner bodies 2 would be balanced, thus balancing the flow rate. However, in practical applications, due to various unavoidable errors, it is difficult to adjust the pressure at each burner body 2 to the average pressure; therefore, step S4 is necessary.

[0050] Specifically, the regulating mechanism 5 can regulate the flow rate of the gas pipeline 1, and thus regulate the pressure within the gas pipeline 1, but it is not responsible for controlling the on / off state of the gas pipeline 1. Therefore, the regulating mechanism 5 can be selected from various valves with high regulation accuracy, which can be adjusted manually or automatically. Preferably, in this embodiment, the regulating mechanism 5 is a needle valve. A needle valve is a special type of valve with a narrow port and a needle-shaped plunger that moves up and down within the port range, which can precisely regulate the flow rate.

[0051] More specifically, when measuring the flow rate or pressure at point 2 on the burner body, an orifice flow meter or differential pressure gauge can be used for measurement.

[0052] Step S4 is implemented by repeating steps S2 and S3 to continuously reduce the pressure difference between each burner body 2, so that the pressure of each burner body 2 gets closer and closer to the average pressure.

[0053] Due to unavoidable errors, when the pressure difference between each burner body 2 is small, repeating steps S2 and S3 will be difficult to achieve a pressure equal to the average pressure of each burner body 2. In other words, repeating steps S2 and S3 will yield minimal results. To reduce the workload of operators, a predetermined difference is set in step S4. When the pressure difference between each burner body 2 is less than or equal to the predetermined difference, it indicates that repeating steps S2 and S3 will have minimal effect, and the burner flow balance adjustment is complete.

[0054] Specifically, in order to minimize the pressure difference between each burner body 2 and reduce the workload of the operators, the pressure difference is specified to be between 0 Pa and 20 Pa. It can be 0 Pa, 5 Pa, 10 Pa, or 20 Pa. Preferably, in this embodiment, the pressure difference is specified to be 10 Pa.

[0055] It should be noted that the specified difference of 0 Pa, that is, the pressure of each burner body 2 is equal, is not impossible, but difficult to achieve. In some processes that require strict adjustment of the flow balance of the burner body 2, the specified difference can be set to 0 Pa.

[0056] In summary, the offline method for adjusting the burner pressure balance in an annealing furnace provided by this invention, compared with existing methods for balancing burner flow in annealing furnaces, is performed offline. On the one hand, the burner flow balance adjustment is not affected by the production line's operating conditions, avoiding repeated measurements caused by production line speed increases or decreases. On the other hand, since the annealing furnace is in a extinguished state with a lower temperature during offline flow balance adjustment, it effectively prevents workers performing the burner flow balance operation from being exposed to high-temperature working environments for extended periods, thus benefiting their health and safety.

[0057] Furthermore, in the offline adjustment method for annealing furnace burner pressure balance provided by this invention, the flow rate of each burner body 2 is tested to ensure balance by using a test gas instead of the mixture of fuel gas and combustion-supporting gas. Since the annealing furnace is offline, the burner body 2 cannot be ignited and burned. Therefore, using a test gas instead of the mixture of fuel gas and combustion-supporting gas ensures safety during flow rate measurement.

[0058] In addition, before entering the gas pipeline 1, the test gas passes through a flow meter and a pressure reducing valve, allowing the staff to intuitively and conveniently adjust the pressure of the test gas entering each section of the gas pipeline 1 to be the same, thereby eliminating the impact of different pressures of the test gas entering each gas pipeline 1 on the accuracy of the burner flow balance results.

[0059] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for offline adjustment of burner pressure balance in an annealing furnace, applied to an annealing furnace, the annealing furnace including an annealing furnace burner and a combustion chamber, the annealing furnace burner including a burner body (2) and a gas pipeline (1); one end of the gas pipeline (1) is connected to the burner body (2), and the other end is connected to a gas source; a valve group for controlling the opening and closing of the gas pipeline (1) is provided on the gas pipeline (1), and adjustment gas can be introduced into a section of the gas pipeline located between the valve group and the burner body (2) through the valve group; a regulating mechanism (5) for regulating the flow rate of the gas pipeline (1) is also provided in the section of the gas pipeline (1) located between the valve group and the burner body (2); the burner bodies (2) of multiple annealing furnace burners are evenly distributed in the combustion chamber, characterized in that, The method includes the following steps: S1. In the offline state, close the valve group and introduce the test gas into the part of each section of the gas pipeline (1) located between the valve group and the burner body (2). The test gas is nitrogen or compressed air. S2. Measure the pressure of the test gas at each burner body (2) and calculate the average pressure. S3. The pressure of the corresponding gas pipeline (1) is adjusted by the adjustment mechanism (5) to adjust the pressure at each burner body (2) towards the average pressure. S4. Set a specified difference value, and measure the pressure of the adjustment gas at each of the burner bodies (2) again. If the maximum difference between the pressures of each burner body (2) is less than or equal to the specified difference value, the adjustment ends. If the maximum difference between the pressures of each burner body (2) is greater than the specified difference value, repeat steps S2 and S3 until the difference between the pressures of each burner body (2) is less than or equal to the specified difference value.

2. The method of claim 1, wherein, Specifically, the pressure of the test gas at each burner body (2) is measured by measuring the pressure of the test gas at each burner using an orifice flow meter or a differential pressure gauge.

3. The method of claim 1, wherein, The specified difference is between 0 Pa and 20 Pa.

4. The method of claim 1, wherein, The valve group includes a solenoid valve (3) and a safety valve (4), wherein the solenoid valve (3) and the safety valve (4) can control the opening and closing of the gas pipeline (1) individually or jointly. The safeguard valve (4) is located on the side of the solenoid valve (3) away from the burner body (2).

5. The method of claim 4, wherein, The solenoid valve (3) has a pressure tap, from which fluid can be input into the portion of the gas pipeline (1) located between the solenoid valve (3) and the burner body (2).

6. The method of claim 5, wherein, The test gas is input to the pressure tap through a pressure reducing valve.

7. The method of claim 1, wherein, The regulating mechanism (5) is a needle valve.

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