Automatic control method and device based on flow asymmetry on both sides of heating furnace

Abstract

The application discloses an automatic control method and device based on flow asymmetry of two sides of a heating furnace, and relates to the technical field of combustion control of the heating furnace. The method comprises the following steps: when the flow proportion of combustion-supporting air and coal gas on the two sides of the heating furnace is consistent, obtaining the coal gas flow data of the two sides of the heating furnace; wherein the two sides of the heating furnace comprise a blocked side and an unblocked side; performing coal gas flow data compensation on the blocked side, so that the difference between the coal gas flow data of the unblocked side and the compensated blocked side is within a preset range; filtering the coal gas flow data of the unblocked side and the compensated blocked side; and based on the filtered coal gas flow data, automatically controlling the flow of the two sides of the heating furnace. The application can realize automatic combustion under the condition that the existing conditions of the furnace body remain unchanged, without production stoppage, hardware modification and process operation influence, and the labor intensity of the operators is reduced, the quality of the steel billets is ensured, energy consumption is reduced, and the application has received good comments from the site personnel.

Description

Technical Field

[0001] This invention relates to the field of combustion control technology for heating furnaces, and in particular to an automatic control method and device based on the asymmetry of flow rates on both sides of a heating furnace. Background Technology

[0002] Some steel mills' heating furnaces, after years of use, develop equipment problems that affect the implementation of automatic control functions. For example, a burner on one side of the furnace may become blocked, or the manual valve of the gas at a certain burner may be closed to prevent overheating in a certain area and affecting quality. As a result, when the left and right sides switch combustion, the gas flow rate will be greatly different at any moment. The regulating valve will fluctuate and oscillate, forcing the control system to switch to manual mode to burn steel, which greatly increases the labor intensity of the workers.

[0003] Blockage in the burner gas pipeline or closing the burner gas pipeline manual valve will cause the throttling point of one side of the gas branch to shift backward, from the original regulating valve position to the manual valve position. This reduces the flow rate, forcing the regulating valve to increase its opening to increase the flow rate, but this is ineffective. The regulating valve continues to increase its opening, but at this point, the regulating valve on this side can no longer regulate the flow rate, as the flow is limited by the throttling point at the burner. When switching to the other side, the throttling point of the airflow is still in the regulating valve position. Since both sides share a single regulating valve, the increased opening of the regulating valve will cause a sudden increase in flow rate, forcing the regulating valve to close again. When switching again, the valve must open again, creating a vicious cycle that causes oscillations. Summary of the Invention

[0004] This invention addresses the problem that in some existing heating furnaces, when the left and right sides switch combustion, the instantaneous difference in the gas flow rate causes the regulating valve to fluctuate erratically, forcing the control system to switch to manual mode for steelmaking, which greatly increases the labor intensity of workers.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] On one hand, the present invention provides an automatic control method based on the asymmetry of flow rates on both sides of a heating furnace. This method is implemented by electronic equipment and includes:

[0007] S1. When the ratio of combustion air flow rate and gas flow rate on both sides of the heating furnace is the same, obtain the gas flow rate data on both sides of the heating furnace; wherein, both sides of the heating furnace include the blocked side and the unblocked side.

[0008] S2. Compensate the gas flow data on the blocked side so that the difference between the gas flow data on the unblocked side and the compensated blocked side is within a preset range.

[0009] S3. Filter the gas flow data on the unblocked side and the compensated blocked side.

[0010] S4. Based on the filtered gas flow data, the flow on both sides of the heating furnace is automatically controlled.

[0011] Optionally, S2 includes performing gas flow data compensation on the blocked side, including:

[0012] S21. Based on the filtered gas flow data on both sides of the heating furnace, the difference between the gas flow data on both sides is calculated.

[0013] S22. Based on the difference, construct a multi-stage difference curve.

[0014] S23. Based on the multi-stage difference curve graph, the difference curve function is obtained.

[0015] S24. Based on the difference curve function, perform gas flow data compensation on the blocked side.

[0016] Optionally, the gas flow data compensation on the blocked side based on the difference curve function in S24 includes:

[0017] S241. Obtain the instantaneous value of the gas flow rate on the current blocked side.

[0018] S242. Based on the difference curve function, obtain the compensation value of the gas flow rate on the current blocked side.

[0019] S243. Based on the compensation value, the instantaneous value of the gas flow on the blocked side is compensated, thereby automatically controlling the flow on both sides of the heating furnace.

[0020] Optionally, the compensation for the instantaneous gas flow rate on the blocked side based on the compensation value in S243 further includes:

[0021] The combustion air flow rate on the blocked side is compensated based on the compensation value.

[0022] Optionally, the method further includes:

[0023] A new address is added to the heating furnace control system; this address is used to store compensation values.

[0024] Optionally, acquiring gas flow data on both sides of the heating furnace in S1 includes:

[0025] Obtain gas flow data at the throttling points on both sides of the heating furnace.

[0026] On the other hand, the present invention provides an automatic control device based on the asymmetric flow rate on both sides of a heating furnace. This device is used to implement an automatic control method based on the asymmetric flow rate on both sides of a heating furnace. The device includes:

[0027] The data acquisition module is used to acquire gas flow data on both sides of the heating furnace when the ratio of combustion air flow to gas flow on both sides of the heating furnace is the same; wherein, the two sides of the heating furnace include the blocked side and the unblocked side;

[0028] The data compensation module is used to compensate the gas flow data on the blocked side, so that the difference between the gas flow data on the unblocked side and the compensated blocked side is within a preset range.

[0029] The filtering module is used to filter the gas flow data on the unblocked side and the compensated blocked side.

[0030] The output module is used to automatically control the flow rates on both sides of the heating furnace based on the filtered gas flow data.

[0031] Optionally, the data compensation module is further used for:

[0032] S21. Based on the filtered gas flow data on both sides of the heating furnace, the difference between the gas flow data on both sides is calculated.

[0033] S22. Based on the difference, construct a multi-stage difference curve.

[0034] S23. Based on the multi-stage difference curve graph, the difference curve function is obtained.

[0035] S24. Based on the difference curve function, perform gas flow data compensation on the blocked side.

[0036] Optionally, the data compensation module is further used for:

[0037] S241. Obtain the instantaneous value of the gas flow rate on the current blocked side.

[0038] S242. Based on the difference curve function, obtain the compensation value of the gas flow rate on the current blocked side.

[0039] S243. Based on the compensation value, the instantaneous value of the gas flow on the blocked side is compensated, thereby automatically controlling the flow on both sides of the heating furnace.

[0040] Optionally, the data compensation module is further used for:

[0041] The combustion air flow rate on the blocked side is compensated based on the compensation value.

[0042] Optionally, it also includes:

[0043] A new address is added to the heating furnace control system; this address is used to store compensation values.

[0044] Optionally, the data acquisition module is further used for:

[0045] Obtain gas flow data at the throttling points on both sides of the heating furnace.

[0046] On the one hand, an electronic device is provided, comprising a processor and a memory, wherein the memory stores at least one instruction, which is loaded and executed by the processor to implement the above-mentioned automatic control method based on the asymmetric flow on both sides of a heating furnace.

[0047] On the one hand, a computer-readable storage medium is provided, wherein at least one instruction is stored in the storage medium, and the at least one instruction is loaded and executed by a processor to implement the above-described automatic control method based on the asymmetry of flow on both sides of a heating furnace.

[0048] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0049] The above solution achieves automatic combustion without changing the existing conditions of the furnace, without stopping production, requiring additional hardware modifications or affecting process operations, reducing the labor intensity of operators, ensuring billet quality, and reducing energy consumption, which has been well received by on-site personnel. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the automatic control method based on the asymmetric flow on both sides of the heating furnace provided in an embodiment of the present invention;

[0052] Figure 2 This is a flow rate curve diagram of the gas pipeline at the burner when it is blocked, provided in an embodiment of the present invention.

[0053] Figure 3 This is a curve showing the difference in flow rates on both sides provided in an embodiment of the present invention;

[0054] Figure 4 This is a curve diagram of the flow rate after compensation on both sides provided in an embodiment of the present invention;

[0055] Figure 5 This is a filtering effect diagram provided in an embodiment of the present invention;

[0056] Figure 6 This is a block diagram of an automatic control device based on the asymmetric flow on both sides of a heating furnace, provided in an embodiment of the present invention.

[0057] Figure 7This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0058] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0059] like Figure 1 As shown, this embodiment of the invention provides an automatic control method based on the asymmetric flow rates on both sides of a heating furnace, which can be implemented by electronic equipment. Figure 1 The flowchart shown is for an automatic control method based on the asymmetric flow on both sides of a heating furnace. The processing flow of this method may include the following steps:

[0060] S1. When the ratio of combustion air flow rate to gas flow rate on both sides of the heating furnace is the same, obtain the gas flow rate data on both sides of the heating furnace.

[0061] The heating furnace has two sides, including a blocked side and an unblocked side.

[0062] Optionally, step S1 above may be: obtaining gas flow data at the throttling points on both sides of the heating furnace.

[0063] In one feasible implementation, the flow curve of the heating furnace with partial blockage of the gas pipeline at the burner is as follows: Figure 2 As shown, there is always a certain regularity; the value on the same side always suddenly decreases, and the difference is similar. If the reduced flow is instantaneously replenished on the side where the flow decreases, the regulating valve will not open to adjust the flow deviation. When the steel is burned on the other side, since the valve position has not changed, the flow will remain at its original value, and no compensation value will be added. In this way, the flow does not change instantaneously, and the regulating valve will not experience instantaneous changes.

[0064] Furthermore, because the blockage is in one type of gas pipe, or only the manual valve for one type of gas is closed, the result is a large difference in the air-to-coal ratio during combustion reversal. This affects the complete combustion of the gas or causes an excessive amount of oxygen. Therefore, before taking these measures, it is essential to close the opening of the manual valves of the related gas and air pipes to make the ratio of the combustion air flow rate to the gas flow rate consistent. This will solve the problem of mismatch in the air-to-coal ratio on both sides of the heating furnace.

[0065] S2. Compensate the gas flow data on the blocked side so that the difference between the gas flow data on the unblocked side and the compensated blocked side is within a preset range.

[0066] Optionally, step S2 above may include the following steps S21-S24:

[0067] S21. Based on the filtered gas flow data on both sides of the heating furnace, the difference between the gas flow data on both sides is calculated.

[0068] S22. Based on the difference, construct a multi-stage difference curve.

[0069] S23. Based on the multi-stage difference curve graph, the difference curve function is obtained.

[0070] S24. Based on the difference curve function, perform gas flow data compensation on the blocked side.

[0071] Optionally, step S24 above may include the following steps S241-S243:

[0072] S241. Obtain the instantaneous value of the gas flow rate on the current blocked side.

[0073] S242. Based on the difference curve function, obtain the compensation value of the gas flow rate on the current blocked side.

[0074] S243. Based on the compensation value, the instantaneous value of the gas flow on the blocked side is compensated, thereby automatically controlling the flow on both sides of the heating furnace.

[0075] In one feasible implementation, based on on-site observation and analysis, this supplementary value is not a constant. When the flow rate is very low, due to the low pressure inside the pipeline, the gas flow rates entering the furnace on both sides are essentially the same. As the production load changes and the flow rate increases, the difference between the two sides of the throttling point begins to widen. When the gas flow rate on the blocked side reaches above 5600 Nm³ / h, the increase in gas flow rate becomes less significant, while the gas flow rate on the non-blocked side continues to increase until it reaches approximately the full-scale value of 15000 Nm³ / h. Based on actual on-site statistics, here is a set of gas flow rate data for the non-blocked side:

[0076] 0NM3 / h, 2000NM3 / h, 3000NM3 / h, 5000NM3 / h, 6000NM3 / h, 7000NM3 / h, 8000N M3 / h, 10000NM3 / h, 12000NM3 / h, 15000NM3 / h,

[0077] The corresponding gas flow data for the side with the blockage is:

[0078] 0NM3 / h, 2000NM3 / h, 2800NM3 / h, 4000NM3 / h, 4500NM3 / h, 4900NM3 / h, 5200N M3 / h, 5600NM3 / h, 5800NM3 / h, 5850NM3 / h,

[0079] Create a curve graph based on the differences in these data, such as... Figure 3 As shown.

[0080] Furthermore, based on these data, a near-approximate expression function can be summarized as shown in equation (1):

[0081]

[0082] Furthermore, the program writes the above expression in a programming language, and adds the calculated compensation value to the instantaneous flow rate value based on the change in the instantaneous flow rate on the blocked side. When switching to the other side, the compensation value Y is zero. The effect of this processing is as follows: Figure 4 As shown. The effect after filtering is as follows. Figure 5 As shown.

[0083] Optionally, the compensation for the instantaneous gas flow rate on the blocked side based on the compensation value in S243 further includes:

[0084] The combustion air flow rate on the blocked side is compensated based on the compensation value.

[0085] In one feasible implementation, during reversing combustion, the air and gas flow rates are compensated and changed together, which stabilizes the control and ensures the safe, reasonable and complete combustion of the gas.

[0086] Optionally, the method further includes:

[0087] A new address is added to the heating furnace control system; this address is used to store compensation values.

[0088] In one feasible implementation, a new address can be added to the program to store the compensation value for the reduced traffic volume. This compensation value can then be added to the actual traffic detection value to compensate for the problem of the sudden decrease in traffic volume.

[0089] S3. Filter the gas flow data on the unblocked side and the compensated blocked side.

[0090] In one feasible implementation, considering the flow data disturbance caused by pressure fluctuations in the reversing combustion furnace, which interferes with automatic control, a filtering subroutine can be added after the data acquisition program. The processed result will make the acquired data curve smoother, with less disturbance during control, and easier to achieve automatic control.

[0091] S4. Based on the filtered gas flow data, the flow on both sides of the heating furnace is automatically controlled.

[0092] In this embodiment of the invention, automatic combustion can be achieved even when the existing conditions of the furnace remain unchanged. This avoids production stoppages, hardware modifications, and disruptions to process operations. It also reduces the labor intensity of operators, ensures the quality of steel billets, and reduces energy consumption, which has been well received by on-site personnel.

[0093] like Figure 6 As shown, this embodiment of the invention provides an automatic control device 600 based on the asymmetry of flow rates on both sides of a heating furnace. This device 600 is used to implement an automatic control method based on the asymmetry of flow rates on both sides of a heating furnace. The device 600 includes:

[0094] The data acquisition module 610 is used to acquire gas flow data on both sides of the heating furnace when the ratio of combustion air flow and gas flow on both sides of the heating furnace is the same; wherein, the two sides of the heating furnace include the blocked side and the unblocked side.

[0095] The data compensation module 620 is used to compensate the gas flow data on the blocked side so that the difference between the gas flow data on the unblocked side and the compensated blocked side is within a preset range.

[0096] The filtering module 630 is used to filter the gas flow data on the unblocked side and the compensated blocked side.

[0097] The output module 640 is used to automatically control the flow on both sides of the heating furnace based on the filtered gas flow data.

[0098] Optionally, the data compensation module 620 is further used for:

[0099] S21. Based on the filtered gas flow data on both sides of the heating furnace, the difference between the gas flow data on both sides is calculated.

[0100] S22. Based on the difference, construct a multi-stage difference curve.

[0101] S23. Based on the multi-stage difference curve graph, the difference curve function is obtained.

[0102] S24. Based on the difference curve function, perform gas flow data compensation on the blocked side.

[0103] Optionally, the data compensation module 620 is further used for:

[0104] S241. Obtain the instantaneous value of the gas flow rate on the current blocked side.

[0105] S242. Based on the difference curve function, obtain the compensation value of the gas flow rate on the current blocked side.

[0106] S243. Based on the compensation value, the instantaneous value of the gas flow on the blocked side is compensated, thereby automatically controlling the flow on both sides of the heating furnace.

[0107] Optionally, the data compensation module 620 is further used for:

[0108] The combustion air flow rate on the blocked side is compensated based on the compensation value.

[0109] Optionally, it also includes:

[0110] A new address is added to the heating furnace control system; this address is used to store compensation values.

[0111] Optionally, the data acquisition module 610 is further used for:

[0112] Obtain gas flow data at the throttling points on both sides of the heating furnace.

[0113] In this embodiment of the invention, automatic combustion can be achieved even when the existing conditions of the furnace remain unchanged. This avoids production stoppages, hardware modifications, and disruptions to process operations. It also reduces the labor intensity of operators, ensures the quality of steel billets, and reduces energy consumption, which has been well received by on-site personnel.

[0114] Figure 7 This is a schematic diagram of the structure of an electronic device 700 provided in an embodiment of the present invention. The electronic device 700 can vary considerably due to different configurations or performance. It may include one or more central processing units (CPUs) 701 and one or more memories 702. The memory 702 stores at least one instruction, which is loaded and executed by the processor 701 to implement the following automatic control method based on the asymmetry of flow on both sides of the heating furnace:

[0115] S1. When the ratio of combustion air flow rate and gas flow rate on both sides of the heating furnace is the same, obtain the gas flow rate data on both sides of the heating furnace; wherein, both sides of the heating furnace include the blocked side and the unblocked side.

[0116] S2. Compensate the gas flow data on the blocked side so that the difference between the gas flow data on the unblocked side and the compensated blocked side is within a preset range.

[0117] S3. Filter the gas flow data on the unblocked side and the compensated blocked side.

[0118] S4. Based on the filtered gas flow data, the flow on both sides of the heating furnace is automatically controlled.

[0119] In an exemplary embodiment, a computer-readable storage medium is also provided, such as a memory including instructions that can be executed by a processor in a terminal to complete the aforementioned automatic control method based on the asymmetric flow rates on both sides of a heating furnace. For example, the computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, or optical data storage device.

[0120] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0121] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic control method based on the asymmetry of flow rates on both sides of a heating furnace, characterized in that, The method includes: S1. When the ratio of combustion air flow rate and gas flow rate on both sides of the heating furnace is the same, obtain the gas flow rate data on both sides of the heating furnace; wherein, one side of the heating furnace is the blocked side and the other side is the unblocked side, and the blocked side is the manual valve of the burner that is blocked or closed or reduced in gas at a certain burner. S2. Compensate the gas flow data on the blocked side so that the difference between the gas flow data of the unblocked side and the compensated blocked side is within a preset range. S3. Filter the gas flow data of the unblocked side and the compensated blocked side; S4. Based on the filtered gas flow data, automatically control the flow on both sides of the heating furnace.

2. The method according to claim 1, characterized in that, The gas flow data compensation for the blocked side in S2 includes: S21. Based on the gas flow data on both sides of the heating furnace, calculate the difference between the gas flow data on both sides. S22. Based on the difference, construct a multi-stage difference curve; S23. Based on the multi-stage difference curve graph, obtain the difference curve function; S24. Based on the difference curve function, perform gas flow data compensation on the blocked side.

3. The method according to claim 2, characterized in that, The gas flow data compensation for the blocked side based on the difference curve function in S24 includes: S241. Obtain the instantaneous value of the gas flow rate on the current blocked side; S242. Based on the difference curve function, obtain the compensation value of the gas flow rate on the current blocked side; S243. Compensate the instantaneous value of the gas flow rate on the blocked side based on the compensation value.

4. The method according to claim 3, characterized in that, The compensation of the instantaneous gas flow rate on the blocked side based on the compensation value in S243 further includes: Based on the compensation value, the combustion air flow rate value on the blocked side is compensated.

5. The method according to claim 3, characterized in that, The method further includes: A new address is added to the heating furnace control system, which is used to store the compensation value.

6. The method according to claim 1, characterized in that, The acquisition of gas flow data on both sides of the heating furnace in S1 includes: Obtain gas flow data at the throttling points on both sides of the heating furnace.

7. An automatic control device based on the asymmetry of flow rates on both sides of a heating furnace, characterized in that, The device includes: The data acquisition module is used to acquire gas flow data on both sides of the heating furnace when the ratio of combustion air flow and gas flow on both sides of the heating furnace is the same; wherein, one side of the heating furnace is the blocked side and the other side is the unblocked side, and the blocked side is the manual valve of the burner that is blocked or closed or reduced in gas flow at a certain burner; the data compensation module is used to compensate the gas flow data of the blocked side so that the difference between the gas flow data of the unblocked side and the compensated blocked side is within a preset range. The filtering module is used to filter the gas flow data of the unblocked side and the compensated blocked side; The output module is used to automatically control the flow rates on both sides of the heating furnace based on the filtered gas flow data.

8. The apparatus according to claim 7, characterized in that, The data compensation module is further used for: S21. Based on the gas flow data on both sides of the heating furnace, calculate the difference between the gas flow data on both sides. S22. Based on the difference, construct a multi-stage difference curve; S23. Based on the multi-stage difference curve graph, obtain the difference curve function; S24. Based on the difference curve function, perform gas flow data compensation on the blocked side.

9. The apparatus according to claim 7, characterized in that, The data compensation module is further used for: S241. Obtain the instantaneous value of the gas flow rate on the current blocked side; S242. Based on the difference curve function, obtain the compensation value of the gas flow rate on the current blocked side; S243. Based on the compensation value, the instantaneous value of the gas flow on the blocked side is compensated, thereby automatically controlling the flow on both sides of the heating furnace.

10. The apparatus according to claim 9, characterized in that, The data compensation module is further used for: Based on the compensation value, the combustion air flow rate value on the blocked side is compensated.

Images