A method and device for controlling the pressure of a heating furnace with forced smoke exhaust, and an electronic device

Abstract

The application discloses a heating furnace pressure control method and device for forced smoke exhaust, and electronic equipment, comprising obtaining the end exhaust pressure value between the flue damper and the smoke exhaust fan, adjusting the frequency of the smoke exhaust fan so that the end exhaust pressure value reaches the first target threshold value; obtaining the front end exhaust pressure value between the flue damper and the heating furnace hearth when the end exhaust pressure value reaches the first target threshold value, adjusting the opening of the flue damper so that the front end exhaust pressure value reaches the second target threshold value, wherein the second target threshold value is a constant value; repeating the above steps until the end exhaust pressure value reaches the first target threshold value and the front end exhaust pressure reaches the second target threshold value at the same time, the application realizes that the heating furnace hearth pressure reaches the preset stable value quickly after the addition of the smoke exhaust fan, the pressure value of the smoke exhaust fan is stabilized quickly, and the efficiency of the operation frequency of the smoke exhaust fan is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of furnace exhaust control, and particularly relates to a furnace pressure control method, device and electronic equipment for forced exhaust furnace. Background Technology

[0002] The heating furnace is one of the key pieces of equipment in a hot rolling production line. Its function is to heat the steel billet to achieve alloy solution treatment and subsequent stable rolling. Furnace pressure is an important control parameter of the heating furnace, which directly affects the heating quality of the slab and fuel consumption. It is generally controlled between 5 and 25 Pa.

[0003] Currently, heating furnaces are roughly divided into three categories according to their flue gas exhaust methods: natural exhaust; forced exhaust using both air and gas regeneration; and forced exhaust with a combination of single regeneration and partial natural exhaust. With the investment in auxiliary equipment such as waste heat recovery, desulfurization, and denitrification in recent years, heating furnaces using natural exhaust must now have additional forced exhaust fans. Due to the long flue gas ducts and the high resistance of auxiliary equipment, when the flue gas volume changes, the exhaust fans, adjusted by frequency converters or dampers, cannot meet the furnace pressure control requirements, leading to problems such as flameout at the furnace door and cold air intake, affecting the operational stability of the heating furnace. Summary of the Invention

[0004] This invention provides a method, device, and electronic equipment for controlling the furnace pressure of a forced exhaust heating furnace. It enables the furnace pressure to quickly reach a preset stable value after the addition of an exhaust fan, while simultaneously stabilizing the pressure value of the exhaust fan and reducing the operating frequency of the exhaust fan.

[0005] Firstly, this application provides the following technical solution through an embodiment:

[0006] A method for controlling furnace pressure in a forced flue gas extraction furnace includes:

[0007] S1. Obtain the end exhaust pressure value between the flue damper and the exhaust fan, and adjust the frequency of the exhaust fan so that the end exhaust pressure value reaches a preset first target threshold.

[0008] S2. Obtain the front exhaust pressure value located between the flue damper and the furnace chamber when the end exhaust pressure value reaches the first target threshold, and adjust the opening of the flue damper so that the front exhaust pressure value reaches the preset second target threshold.

[0009] S3. Repeat steps S1 to S2 until the end exhaust pressure reaches the first target threshold and the front exhaust pressure reaches the second target threshold.

[0010] In some embodiments, adjusting the frequency of the exhaust fan based on the terminal exhaust pressure, so that the terminal exhaust pressure reaches the first target threshold, includes:

[0011] Different zones are divided according to the different amounts of gas used in the heating furnace;

[0012] Based on the different intervals, different first target thresholds are set for the different intervals.

[0013] In some embodiments, the control method further includes:

[0014] When the opening of the flue damper is greater than or equal to 70% of the maximum opening and closing limit of the entire flue damper, the opening is reduced by 50 Pa based on the first target threshold that has been preset.

[0015] In some embodiments, the control method further includes:

[0016] If the front-end exhaust pressure value is less than 2 Pa for more than 20 seconds, reduce it by 50 Pa based on the preset first target threshold.

[0017] When the front-end exhaust pressure value is greater than or equal to 2 Pa for more than 1 minute, control is performed according to the first target threshold that has been preset.

[0018] In some embodiments, the control method further includes: controlling the time interval between two adjacent switching of the first target threshold to be more than 10 seconds.

[0019] In some embodiments, the control method further includes:

[0020] The opening adjustment of the flue damper per second shall not exceed 0.5% of the maximum opening and closing limit of the entire flue damper.

[0021] In some embodiments, the control method further includes:

[0022] When the detected flue gas temperature exceeds the set threshold, the cooling fan is controlled to mix cooling air into the flue between the heating furnace and the flue damper.

[0023] In some embodiments, the control method further includes:

[0024] The airflow rate of the cooling fan is controlled to be within 5000 m / s. 3 / min or less.

[0025] Secondly, based on the same inventive concept, this application provides the following technical solution through an embodiment:

[0026] A forced-draft furnace pressure control device, applied to the method described in any one of the above embodiments, the device comprising:

[0027] The terminal exhaust pressure detection unit is used to detect the terminal exhaust pressure value between the flue damper and the exhaust fan;

[0028] The exhaust fan frequency adjustment unit is used to adjust the frequency of the exhaust fan according to the terminal exhaust pressure, so that the terminal exhaust pressure value reaches the preset first target threshold.

[0029] A front-end exhaust pressure detection unit is used to detect the front-end exhaust pressure value between the flue damper and the heating furnace;

[0030] The flue damper opening adjustment unit is used to adjust the opening of the flue damper according to the front-end exhaust pressure value, so that the front-end exhaust pressure value reaches the preset second target threshold.

[0031] Thirdly, based on the same inventive concept, this application provides the following technical solution through an embodiment:

[0032] An electronic device for controlling furnace pressure in a forced-draft heating furnace, applied to the method described in any of the above embodiments, the electronic device comprising:

[0033] The method includes one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to implement the method as claimed in any one of claims 1-8.

[0034] The one or more technical solutions provided in the embodiments of the present invention achieve at least the following technical effects or advantages:

[0035] This invention first detects the terminal exhaust pressure and adjusts the frequency of the exhaust fan to stabilize the terminal exhaust pressure at a preset value. Then, it detects the front exhaust pressure near the furnace and adjusts the opening of the damper to stabilize the front exhaust pressure at a preset value. This process is repeated until both the terminal and front exhaust pressures reach their preset values. This solves the problem of rapidly stabilizing the furnace pressure while reducing the fan operating frequency after adding an exhaust fan, as the original flue damper cannot properly match the fan. Attached Figure Description

[0036] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a flowchart of the control method in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram showing the system location of the control device in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the control device in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention 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 the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] In this invention, the terms "first," "second," etc., are used 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, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0043] Firstly, this application provides the following technical solution through an embodiment:

[0044] A method for controlling furnace pressure in a forced flue gas exhaust heating furnace, see [link / reference]. Figure 1 As shown, it includes:

[0045] S1. Obtain the end exhaust pressure value between the flue damper and the exhaust fan, and adjust the exhaust fan frequency so that the end exhaust pressure value reaches the preset first target threshold.

[0046] S2. Obtain the front exhaust pressure value between the flue damper and the furnace chamber when the end exhaust pressure value reaches the first target threshold, and adjust the opening of the flue damper so that the front exhaust pressure value reaches the preset second target threshold, where the second target threshold, that is, the furnace pressure, is a constant value.

[0047] S3. Repeat steps S1 to S2 until the end exhaust pressure reaches the first target threshold and the front exhaust pressure reaches the second target threshold.

[0048] The beneficial effects of this invention are as follows: This invention first detects the terminal exhaust pressure and adjusts the frequency of the exhaust fan to stabilize the terminal exhaust pressure at a preset value. Then, it detects the front exhaust pressure near the furnace and adjusts the opening of the damper to stabilize the front exhaust pressure at a preset value. This process is repeated until both the terminal and front exhaust pressures reach their preset values. This solves the problem of the furnace pressure stabilizing quickly while reducing the fan operating frequency after adding an exhaust fan, as the original flue damper could not properly match the fan after the addition of the exhaust fan.

[0049] In some embodiments, adjusting the frequency of the exhaust fan based on the terminal exhaust pressure so that the terminal exhaust pressure reaches a first target threshold includes:

[0050] Different zones are divided according to the different amounts of gas used in the heating furnace;

[0051] Different first target thresholds are set for different intervals.

[0052] It is understandable that, since the gas volume and flue gas volume change proportionally, and there is no dedicated instrument to effectively measure the flue gas volume, the gas volume is used instead of the flue gas volume for measurement. Different first target thresholds are set according to different gas volumes, and the first target threshold at the exhaust fan can be scientifically and proportionally adjusted according to the changes in the working load in the furnace.

[0053] In some embodiments, the control method further includes:

[0054] When the opening of the flue damper is greater than or equal to 70% of the maximum opening and closing limit of the entire flue damper, the pressure is reduced by 50 Pa based on the pre-set first target threshold.

[0055] It is understandable that by compensating for the exhaust pressure of the first target threshold when the flue damper is opened at a large degree, it is possible to ensure that the flue damper is within the optimal adjustment range and prevent the opening from being too large, which would affect the stability of the adjustment.

[0056] In some embodiments, the control method further includes:

[0057] If the front-end exhaust pressure value is less than 2 Pa for more than 20 seconds, reduce it by 50 Pa based on the pre-set first target threshold.

[0058] When the front-end exhaust pressure value is greater than or equal to 2 Pa for more than 1 minute, control is applied according to the preset first target threshold.

[0059] It is understandable that the furnace pressure may be low due to errors in detection or momentary fluctuations in operating conditions. Pressure compensation can be performed to make the flue gas exhaust process more stable.

[0060] In some embodiments, the control method further includes:

[0061] The time interval between two consecutive switching of the first target threshold is more than 10 seconds.

[0062] It is understandable that if the time interval between setting different target values ​​for exhaust pressure based on different flue gas volumes is too short, it is easy to cause repeated fluctuations, which can easily lead to instability in the entire exhaust interlocking system.

[0063] In some embodiments, the control method further includes:

[0064] The opening adjustment of the flue damper per second shall not exceed 0.5% of the maximum opening and closing limit of the entire flue damper.

[0065] Understandably, a smaller adjustment range for the opening of the flue damper helps prevent over-adjustment from causing system instability. In addition, it can also avoid interference with the exhaust pressure at the exhaust fan.

[0066] In some embodiments, the control method further includes:

[0067] When the detected flue gas temperature exceeds the set threshold, the cooling fan is controlled to mix cooling air into the flue between the heating furnace and the flue damper.

[0068] It is understandable that installing a cooling fan to cool the flue can protect the air and gas heat exchangers in the flue. Of course, the operation of the cooling fan will affect the adjustment of the flue damper and exhaust fan.

[0069] In some embodiments, the control method further includes:

[0070] Control the airflow rate of the cooling fan to within 5000 m³ / s. 3Below 5000 m³ / min, it is understandable that when the cooling air fan starts and stops, the flue gas volume changes, triggering adjustments to the flue damper and exhaust fan. This process can easily cause furnace pressure fluctuations, so the rate of change of the cooling air volume needs to be controlled within 5000 m³ / min. 3 Below a certain speed, sufficient response time is allowed for the control system to ensure stable furnace pressure.

[0071] Examples are given below:

[0072]

[0073] Secondly, based on the same inventive concept, this application provides the following technical solution through an embodiment:

[0074] A forced exhaust furnace pressure control device 10, see [link to relevant documentation] Figure 2 and Figure 3 As shown, the apparatus for applying any of the above methods includes:

[0075] The terminal exhaust pressure detection unit 11 is used to detect the terminal exhaust pressure value between the flue damper and the exhaust fan;

[0076] The exhaust fan frequency adjustment unit 12 is used to adjust the frequency of the exhaust fan according to the terminal exhaust pressure so that the terminal exhaust pressure value reaches the preset first target threshold.

[0077] The front-end exhaust pressure detection unit 13 is used to detect the front-end exhaust pressure value between the flue damper and the heating furnace.

[0078] The flue damper opening adjustment unit 14 is used to adjust the opening of the flue damper according to the front exhaust pressure value so that the front exhaust pressure value reaches the preset second target threshold.

[0079] The beneficial effects produced by the device provided in this embodiment are the same as those produced by the first aspect embodiment.

[0080] Thirdly, based on the same inventive concept, this application provides the following technical solution through an embodiment:

[0081] An electronic device for controlling furnace pressure in a forced flue gas heating furnace, see [link / reference] Figure 4 As shown, it includes:

[0082] It includes one or more processors 22 and one or more memories 24, wherein at least one piece of program code is stored in one or more memories 23, and the at least one piece of program code is loaded and executed by one or more processors to implement the method of any of the preceding claims.

[0083] The bus architecture (represented by bus 20) is described in [reference needed]. Figure 4As shown, bus 20 may include any number of interconnected buses and bridges, linking various circuits including one or more processors 22 represented by processor 22 and memory represented by memory 24. Bus 20 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 25 provides an interface between bus 20 and receiver 21 and transmitter 23. Receiver 21 and transmitter 23 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 22 is responsible for managing bus 20 and general processing, while memory 24 may be used to store data used by processor 22 during operation.

[0084] The electronic device provided in this embodiment produces the same beneficial effects as the first aspect embodiment.

[0085] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this invention and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units can be integrated into a single processing unit, or each unit can exist physically separately, or two or more units can be integrated into a single unit.

[0086] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between units or modules may be electrical or other forms.

[0087] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0088] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0089] The above are merely embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for controlling furnace pressure in a forced flue gas exhaust heating furnace, characterized in that, include: S1. Obtain the end exhaust pressure value between the flue damper and the exhaust fan, and adjust the frequency of the exhaust fan so that the end exhaust pressure value reaches a preset first target threshold. S2. Obtain the front exhaust pressure value between the flue damper and the furnace chamber when the end exhaust pressure value reaches the first target threshold, and adjust the opening of the flue damper so that the front exhaust pressure value reaches the preset second target threshold. S3. Repeat steps S1 to S2 until the end exhaust pressure reaches the first target threshold and the front exhaust pressure reaches the second target threshold. The control method further includes: dividing the furnace into different zones according to the different gas consumption rates in the heating furnace; Based on the different intervals, different first target thresholds are set for the different intervals.

2. The control method according to claim 1, characterized in that, The control method further includes: When the opening of the flue damper is greater than or equal to 70% of the maximum opening and closing limit of the entire flue damper, the opening is reduced by 50 Pa based on the first target threshold that has been preset.

3. The control method according to claim 1, characterized in that, The control method further includes: When the front-end exhaust pressure value is less than 2 Pa for more than 20 seconds, the pressure is reduced by 50 Pa based on the first target threshold that has been preset. When the front-end exhaust pressure value is greater than or equal to 2 Pa for more than 1 minute, control is performed according to the first target threshold that has been preset.

4. The control method according to claim 1, characterized in that, The control method further includes: controlling the time interval between two adjacent switching of the first target threshold to be more than 10 seconds, wherein the time interval is the time interval between two switching actions when the first target threshold switches between different intervals.

5. The control method according to claim 1, characterized in that, The control method further includes: The opening adjustment of the flue damper per second shall not exceed 0.5% of the maximum opening and closing limit of the entire flue damper.

6. The control method according to claim 1, characterized in that, The control method further includes: When the detected flue gas temperature exceeds the set threshold, the cooling fan is controlled to mix cooling air into the flue between the heating furnace and the flue damper.

7. The control method according to claim 6, characterized in that, The control method further includes: The air volume change rate of the cooling fan is controlled to be below 5000 m³ / min.

8. A furnace pressure control device for a forced flue gas heating furnace, characterized in that, The apparatus, applied to the control method as described in any one of claims 1 to 7, comprises: The terminal exhaust pressure detection unit is used to detect the terminal exhaust pressure value between the flue damper and the exhaust fan; The exhaust fan frequency adjustment unit is used to adjust the frequency of the exhaust fan according to the terminal exhaust pressure value, so that the terminal exhaust pressure value reaches a preset first target threshold. The front-end exhaust pressure detection unit is used to detect the front-end exhaust pressure value between the flue damper and the heating furnace; The flue damper opening adjustment unit is used to adjust the opening of the flue damper according to the front-end exhaust pressure value, so that the front-end exhaust pressure value reaches a preset second target threshold.

9. An electronic device, characterized in that, The electronic device includes one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to implement the method as described in any one of claims 1-7.

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