A hot blast stove baking control system, control method, device and storage medium

Abstract

The application discloses a hot blast stove baking control system, a control method, equipment and a storage medium. The hot blast stove baking control system comprises at least one hot blast stove, which is communicated with a blast furnace and provides heat energy to the blast furnace; the hot blast stove is internally provided with a pressure detection module and a temperature detection module for detecting the pressure and temperature in the hot blast stove; a flue main pipe is communicated with the hot blast stove, and a flue valve is arranged on the flue main pipe; when the flue valve is opened, waste gas in the hot blast stove is discharged; a bypass pipe is arranged between the input end and the output end of a waste heat recovery module and is provided with a bypass valve; a quick-opening valve is arranged on the flue main pipe; an input end of a flue gas induced draft fan is communicated with the output end of the waste heat recovery module, and an output end is communicated with a chimney; the flue gas induced draft fan is used for leading out waste gas in the hot blast stove; a control module is used for adjusting the opening degree of the flue valve, the bypass valve and the quick-opening valve and the frequency of the flue gas induced draft fan according to the pressure and the temperature, so as to adjust the negative pressure value in the hot blast stove. The application improves the negative pressure adjusting effect of the hot blast stove.

Description

Technical Field

[0001] This invention relates to the field of hot blast stove technology, and in particular to a hot blast stove drying control system, control method, equipment and storage medium. Background Technology

[0002] During the hot blast stove baking process, when the blast furnace is shut down for a long time, the chimney temperature is low and the height difference between the baking burner of the hot blast stove and the top of the chimney is small. This causes positive pressure to appear in the hot blast stove during the baking process. The baking gas does not enter the heat storage chamber of the hot blast stove smoothly, but is blown out backward, which burns the equipment in the baking burner area of ​​the hot blast stove. This prevents the baking process from proceeding normally, delays the baking and blast furnace commissioning process, and may even lead to personal injury accidents. Summary of the Invention

[0003] This invention provides a hot blast stove oven control system, control method, equipment, and storage medium to improve the negative pressure regulation effect of the hot blast stove.

[0004] According to one aspect of the present invention, a hot blast stove drying control system is provided, comprising:

[0005] At least one hot blast stove is connected to the blast furnace and is used to provide heat energy to the blast furnace; the hot blast stove is equipped with a pressure detection module and a temperature detection module, which are used to detect the pressure and temperature inside the hot blast stove, respectively;

[0006] A main flue pipe is connected to the hot blast stove, and a flue valve is installed on the main flue pipe; the main flue pipe is used to discharge the waste gas in the hot blast stove when the flue valve is opened;

[0007] The waste heat recovery module has its input end connected to the main flue pipe, and its input end and output end are also connected through a bypass pipe, which is equipped with a bypass valve.

[0008] A quick-opening valve is installed on the main flue pipe. The input end of the quick-opening valve is connected to the output end of the waste heat recovery module, and the output end of the quick-opening valve is connected to the chimney.

[0009] A flue gas induced draft fan, wherein the input end of the flue gas induced draft fan is connected to the output end of the waste heat recovery module, and the output end of the flue gas induced draft fan is connected to the chimney;

[0010] The flue gas induced draft fan is used to draw out the waste gas in the hot air furnace when the waste heat recovery module and / or bypass valve are turned on;

[0011] The control module is connected to the pressure detection module, temperature detection module, flue valve, waste heat recovery module, bypass valve, quick-opening valve and flue gas induced draft fan; the control module is used to adjust the opening degree of the flue valve, the bypass valve and the quick-opening valve, as well as the frequency of the flue gas induced draft fan, according to the pressure and temperature, thereby adjusting the negative pressure value in the hot blast furnace.

[0012] Optionally, the hot blast stove baking control system further includes: a flue gas purification module, wherein the input end of the flue gas purification module is connected to the output end of the waste heat recovery module, and the output end of the flue gas purification module is connected to the input end of the flue gas induced draft fan; the output end of the flue gas induced draft fan is connected to the chimney.

[0013] Optionally, the hot blast stove oven control system further includes: multiple gas branch pipes connected to the hot blast stove; and gas shut-off valves installed on the gas branch pipes for shutting off or connecting the gas supply to the hot blast stove.

[0014] According to another aspect of the present invention, a control method for a hot blast stove is provided, applied to the hot blast stove control system described in any embodiment of the present invention; the method includes:

[0015] Cut off the gas supply to the hot blast stove;

[0016] When the pressure inside the hot air furnace exceeds the first negative pressure threshold, the flue valve is adjusted to the first opening degree, the quick-opening valve is adjusted to the second opening degree, and the bypass valve is fully opened.

[0017] The flue gas induced draft fan is controlled to operate at a first frequency so that the pressure inside the hot air furnace is maintained within the range of the first negative pressure threshold.

[0018] Optionally, the control method for the hot blast stove also includes:

[0019] Connect the gas supply to the hot blast furnace;

[0020] When the pressure inside the hot air furnace is greater than the second negative pressure threshold and the temperature inside the hot air furnace is less than the first preset temperature, the bypass valve is controlled to close, and the flue valve is adjusted to the range of the first opening degree, and the quick-opening valve is adjusted to the range of the third opening degree; wherein, the range of the third opening degree is generally smaller than the second opening degree.

[0021] The flue gas induced draft fan is controlled to operate at a first frequency so that the pressure inside the hot air furnace is maintained within the range of the second negative pressure threshold; wherein the range of the second negative pressure threshold is generally smaller than the range of the first negative pressure threshold.

[0022] Optionally, the control method for the hot blast stove also includes:

[0023] Increase the gas supply in the hot blast stove;

[0024] When the temperature inside the hot air furnace rises to a level greater than the first preset temperature but less than the second preset temperature, the quick-opening valve is adjusted to a fourth opening degree; wherein the range of the fourth opening degree is generally smaller than the range of the third opening degree;

[0025] The flue gas induced draft fan is controlled to continue operating at the first frequency, so that the pressure inside the hot air furnace is maintained within the range of the third negative pressure threshold; wherein, the minimum value of the range of the third negative pressure threshold is less than the minimum value of the range of the second negative pressure threshold, and the maximum value of the range of the third negative pressure threshold is less than the maximum value of the range of the second negative pressure threshold.

[0026] Optionally, the control method for the hot blast stove also includes:

[0027] Continue to increase the gas supply in the hot blast stove;

[0028] When the temperature inside the hot air furnace rises to a level greater than the second preset temperature, the flue valve is adjusted to a fifth opening degree; wherein the range of the fifth opening degree is generally greater than the range of the first opening degree;

[0029] The flue gas induced draft fan is controlled to operate at a second frequency to maintain the pressure inside the hot air furnace within a fourth negative pressure threshold range; wherein the range of the fourth negative pressure threshold is generally smaller than the range of the third negative pressure threshold; and the range of the second frequency is generally larger than the range of the first frequency.

[0030] Optionally, the control method for the hot blast stove also includes:

[0031] The flue valve is adjusted to the sixth opening degree, and the quick-opening valve is adjusted to the fourth opening degree; wherein the range of the sixth opening degree is generally smaller than the range of the fifth opening degree;

[0032] The flue gas induced draft fan is controlled to operate at the first frequency so that the pressure inside the hot air furnace is maintained within the range of the fifth negative pressure threshold; wherein the range of the fifth negative pressure threshold is generally larger than the range of the fourth negative pressure threshold.

[0033] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0034] At least one control module; and

[0035] A memory communicatively connected to the at least one control module; wherein,

[0036] The memory stores a computer program that can be executed by the at least one control module, and the computer program is executed by the at least one control module to enable the at least one control module to perform the control method for hot blast stove baking according to any embodiment of the present invention.

[0037] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions, the computer instructions being used to cause a control module to execute and implement the control method for hot blast stove baking as described in any embodiment of the present invention.

[0038] The technical solution provided in this invention, by setting up pressure and temperature detection modules, can detect the pressure and temperature inside the hot blast stove. When the pressure inside the hot blast stove does not meet the negative pressure threshold, the control module controls the opening degree of the flue valve, bypass valve, and quick-opening valve, as well as the frequency of the flue gas induced draft fan, thereby regulating the pressure inside the hot blast stove. This invention can adjust different negative pressure thresholds for different furnace temperatures, and by adjusting the opening degree and frequency, ensures that the pressure inside the furnace always meets the set negative pressure threshold, achieving good regulation effect and preventing damage to the equipment in the furnace burner installation area due to high-temperature heat waves.

[0039] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0040] 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.

[0041] Figure 1 This is a schematic diagram of the structure of a hot blast stove according to an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of a hot blast stove drying control system according to an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of another hot blast stove drying control system provided according to an embodiment of the present invention;

[0044] Figure 4 This is a flowchart of a control method for a hot blast stove according to an embodiment of the present invention;

[0045] Figure 5This is a flowchart of another control method for a hot blast stove according to an embodiment of the present invention;

[0046] Figure 6 This is a flowchart of another control method for a hot blast stove according to an embodiment of the present invention;

[0047] Figure 7 This is a flowchart of another control method for a hot blast stove according to an embodiment of the present invention;

[0048] Figure 8 This is a flowchart of another control method for a hot blast stove according to an embodiment of the present invention;

[0049] Figure 9 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0051] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0052] This invention provides a hot blast stove drying control system. Figure 1 This is a schematic diagram of the structure of a hot blast stove provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of a hot blast stove drying control system provided in an embodiment of the present invention. (Combined with...) Figure 1 and Figure 2The hot blast stove control system includes: a main flue pipe 3, a waste heat recovery module 4, a quick-opening valve 33, a flue gas induced draft fan 5, a control module (not shown in the figure), and at least one hot blast stove 1. The hot blast stove 1 is connected to the blast furnace 2 and is used to provide heat energy to the blast furnace 2. The hot blast stove 1 has a built-in pressure detection module 11 and a temperature detection module 12, used to detect the pressure and temperature inside the hot blast stove 1, respectively. The main flue pipe 3 is connected to the hot blast stove 2, and a flue valve 31 is installed on the main flue pipe 3; the main flue pipe 3 is used to discharge the waste gas from the hot blast stove 1 when the flue valve 31 is opened. The input end of the waste heat recovery module 4 is connected to the main flue pipe 3, and the input and output ends of the waste heat recovery module 4 are also connected through a bypass pipe, on which a bypass valve 32 is installed. The quick-opening valve 33 is installed on the main flue pipe, with its input end connected to the output end of the waste heat recovery module 4, and its output end connected to the chimney 6. The input end of the flue gas induced draft fan 5 is connected to the output end of the waste heat recovery module 4, and the output end of the flue gas induced draft fan 5 is connected to the chimney 6. The flue gas induced draft fan 5 is used to draw out the waste gas in the hot blast furnace 1 when the waste heat recovery module 4 and / or the bypass valve 32 are open; the control module is connected to the pressure detection module 11, the temperature detection module 12, the flue valve 31, the waste heat recovery module 4, the bypass valve 32, the quick-opening valve 33 and the flue gas induced draft fan 8; the control module is used to adjust the opening degree of the flue valve 31, the bypass valve 32 and the quick-opening valve 33, as well as the frequency of the flue gas induced draft fan 8, according to the pressure and temperature, thereby adjusting the negative pressure value in the hot blast furnace 1.

[0053] The hot blast stove 1 is a thermal device integrating combustion and heat transfer processes, used to provide hot airflow to the blast furnace 2. A blast furnace 2 can be equipped with multiple hot blast stoves 1. The hot blast stove 1 is generally equipped with removable furnace burners 13 to provide a continuous ignition source. When the internal pressure of the hot blast stove 1 is too high (positive or negative), the flame in the hot blast stove 1 may damage the equipment in the area where the furnace burners 13 are installed.

[0054] The pressure detection module 11 and temperature detection module 12 can detect the pressure and temperature inside the hot blast furnace 1, respectively. The control module receives the pressure and temperature values ​​and sets different negative pressure thresholds for different temperatures. When the control module detects that the pressure inside the hot blast furnace 1 has not reached the set negative pressure threshold, the control module sends a control signal and adjusts the opening degree of the flue valve 31, bypass valve 32, and quick-opening valve 33, as well as the frequency of the flue gas induced draft fan 8, to regulate the negative pressure value in the hot blast furnace 1.

[0055] For example, before ignition, the negative pressure threshold inside the hot blast stove 1 can be set to ≤-0.5 kPa. To achieve this negative pressure threshold, the opening of the flue valve 31 can be adjusted to 1 / 3 to 1 / 2, the opening of the bypass valve 32 to 100%, the opening of the quick-opening valve 33 to 20%, and the frequency of the flue gas induced draft fan 8 to 15 to 20 Hz. This configuration allows for pressure regulation within the hot blast stove 1 until it stabilizes within ≤-0.5 kPa. At this point, when the furnace burner 13 is ignited, the hot blast stove 1 will not backflush out high-temperature heat waves, nor will it damage the equipment in the installation area of ​​the furnace burner 13.

[0056] After the hot blast stove 1 is ignited, as the temperature inside the hot blast stove 1 continues to rise, the temperature of the high-temperature heat wave also gradually increases. In order to protect the installation area of ​​the furnace burner 13 to the greatest extent, the negative pressure threshold can be continuously reduced. By adjusting the opening of the flue valve 31, bypass valve 32 and quick-opening valve 33, and adjusting the frequency of the flue gas induced draft fan 8, the flue gas inside the hot blast stove 1 can be quickly discharged, and the pressure inside the hot blast stove 1 can be maintained within the set negative pressure threshold range.

[0057] The technical solution provided in this invention, by setting up a pressure detection module 11 and a temperature detection module 12, can detect the pressure and temperature inside the hot blast furnace 1. When the pressure inside the hot blast furnace 1 does not meet the negative pressure threshold, the control module controls the opening degree of the flue valve 31, bypass valve 32, and quick-opening valve 33, as well as the frequency of the flue gas induced draft fan 8, thereby regulating the pressure inside the hot blast furnace 1. This invention can adjust different negative pressure thresholds for different furnace temperatures, and by adjusting the opening degree and frequency, ensures that the pressure inside the furnace always meets the set negative pressure threshold, achieving a good regulation effect and preventing damage to the equipment in the furnace burner 13 installation area due to high-temperature heat waves.

[0058] Figure 3 A schematic diagram of another hot blast stove drying control system provided in an embodiment of the present invention. (Refer to...) Figure 3 Based on the above embodiments, optionally, the hot blast stove baking control system further includes: a flue gas purification module 7, the input end of which is connected to the output end of the waste heat recovery module 4, and the output end of the flue gas purification module 7 is connected to the input end of the flue gas induced draft fan 5; the output end of the flue gas induced draft fan 5 is connected to the chimney 6.

[0059] The flue gas purification module 7 purifies the exhaust gas discharged from the main flue duct 3 and transmits the purified exhaust gas to the chimney 6 for discharge into the atmosphere. The flue gas purification module 7 is connected to the flue gas induced draft fan 5, which accelerates the discharge of exhaust gas and ensures that the pressure inside the hot blast furnace 1 meets the negative pressure condition.

[0060] Based on the above embodiments, the hot blast stove oven control system may optionally include: multiple gas branch pipes connected to the hot blast stove; and gas shut-off valves installed on the gas branch pipes for shutting off or connecting the gas supply to the hot blast stove.

[0061] In the stage before the hot blast stove is ignited, in order to prevent gas from leaking into the hot blast stove and causing gas to accumulate in front of the main flue and chimney, the gas shut-off valve can be adjusted to the lower limit position, thereby cutting off the gas supply to the hot blast stove. This prevents accidents such as explosions or detonations in the main flue and chimney caused by the gas shut-off valve not closing tightly, which could lead to blast furnace shutdown.

[0062] This invention also provides a control method for hot blast stove drying, applicable to the hot blast stove drying control system provided in any embodiment of this invention. Figure 4 A flowchart illustrating a control method for a hot blast stove drying oven, provided as an embodiment of the present invention. (See reference...) Figure 4 The method includes:

[0063] S110, Cut off the gas supply to the hot blast stove.

[0064] Before igniting the furnace, the gas shut-off valve should be adjusted to its lowest position to prevent gas from leaking into the hot blast stove during the furnace baking process due to the valve not closing tightly. Before ignition, the temperature inside the hot blast stove is relatively low, so the first negative pressure threshold can be set to ≤-0.5 kPa.

[0065] S120. When the pressure inside the hot blast furnace exceeds the first negative pressure threshold, adjust the flue valve to the first opening degree, adjust the quick-opening valve to the second opening degree, and fully open the bypass valve.

[0066] The pressure detection module continuously monitors the pressure inside the hot blast furnace. When the pressure inside the hot blast furnace does not reach the first negative pressure threshold, the control module can adjust the opening degree of the flue valve, quick-opening valve, and bypass valve. For example, the first opening degree can be 1 / 3 to 1 / 2, and the second opening degree can be 20%.

[0067] The control module can control the flue valve to adjust to a specific opening value within the range of the first opening degree. It can also continuously adjust the opening degree of the flue valve within the range of the first opening degree according to the pressure inside the hot blast furnace. This setting method has a good adjustment effect.

[0068] S130. Control the flue gas induced draft fan to operate at the first frequency, so that the pressure inside the hot blast furnace is maintained within the range of the first negative pressure threshold.

[0069] The flue gas induced draft fan is used to extract waste gas from the main flue pipe 3, and its first frequency can be in the range of 15-20Hz. The flue gas induced draft fan can operate at a specific frequency within the first frequency range, or its frequency can be continuously adjusted within the first frequency range according to the pressure inside the hot blast furnace. For example, when the pressure inside the hot blast furnace is high, in order to reduce the pressure inside the hot blast furnace, the control module controls the flue gas induced draft fan to increase its operating frequency within the first frequency range, so that the flue gas induced draft fan can accelerate the extraction of waste gas from the main flue pipe 3, thereby reducing the pressure inside the hot blast furnace until the pressure inside the hot blast furnace is adjusted to ≤-0.5KPa.

[0070] The technical solution provided by this invention detects the pressure and temperature inside the hot blast stove. When the pressure inside the hot blast stove does not meet the negative pressure threshold, the opening degree of the flue valve, bypass valve, and quick-opening valve, as well as the frequency of the flue gas induced draft fan, are controlled to regulate the pressure inside the hot blast stove. This invention can adjust different negative pressure thresholds for different furnace temperatures, and by adjusting the opening degree and frequency, the pressure inside the furnace is always kept within the set conditions, resulting in good regulation effect and preventing damage to the equipment in the furnace burner installation area due to high-temperature heat waves.

[0071] Figure 5 A flowchart illustrating another control method for a hot blast stove provided in an embodiment of the present invention. (See reference...) Figure 5 Based on the above embodiments, optionally, after step S130, when the hot blast stove is in the ignition process of the oven and the temperature inside the hot blast stove is lower than the first preset temperature, the method further includes:

[0072] S210, Connect the gas supply to the hot blast stove.

[0073] During the baking process of the hot blast stove, the gas supply to the stove is connected. A continuous ignition source is provided through the baking burners, causing the gas in the stove to burn. During the combustion process, the amount of flue gas generated in the stove gradually increases. To improve the stability and safety of the flame in the stove, when the temperature inside the stove is lower than a first preset temperature, the first negative pressure threshold inside the stove is raised to a second negative pressure threshold. For example, the first preset temperature can be 300℃, and the second negative pressure threshold can be -0.5 to -0.8 kPa.

[0074] S220. When the pressure inside the hot air furnace is greater than the second negative pressure threshold and the temperature inside the hot air furnace is less than the first preset temperature, the bypass valve is closed, and the flue valve is adjusted to the first opening range, and the quick-opening valve is adjusted to the third opening range.

[0075] The system continuously monitors the pressure and temperature inside the hot blast furnace. When the temperature inside the furnace is below 300°C, the bypass valve is closed, and the exhaust gas in the main flue is transferred through the waste heat recovery device. The flue valve is adjusted to the first opening range, and the quick-opening valve is adjusted to the third opening range. The third opening range is generally smaller than the second opening range; for example, the third opening range can be 10-15%.

[0076] S230. Control the flue gas induced draft fan to operate at a first frequency so that the pressure inside the hot air furnace is maintained within the range of a second negative pressure threshold; wherein the range of the second negative pressure threshold is generally smaller than the range of the first negative pressure threshold.

[0077] The flue gas induced draft fan operates at the first frequency until the pressure inside the hot blast stove is adjusted to the range of -0.5 to -0.8 kPa. When the pressure inside the hot blast stove is adjusted to the range of the second negative pressure threshold, the pressure and temperature inside the hot blast stove are continuously monitored, and the opening degree of the flue valve and quick-opening valve is finely adjusted within their respective ranges according to different temperatures or pressures, so that the pressure inside the hot blast stove can be maintained within the range of the second negative pressure threshold.

[0078] Figure 6 A flowchart illustrating another control method for a hot blast stove provided in an embodiment of the present invention. (See reference) Figure 6 Based on the above embodiments, optionally, after step S130 or step S230, when the hot blast stove is in the ignition process of the oven, and the temperature inside the hot blast stove is higher than the first preset temperature and lower than the second preset temperature, the method further includes:

[0079] S310. Increase the gas supply in the hot blast stove.

[0080] As the gas supply to the hot blast stove increases, the temperature inside the stove also rises. When the temperature exceeds a first preset temperature but falls below a second preset temperature, the pressure inside the stove can be set to a third negative pressure threshold. The minimum value of the third negative pressure threshold is less than the minimum value of the second negative pressure threshold, and the maximum value is less than the maximum value of the second negative pressure threshold. For example, the third negative pressure threshold can be -0.7 to -1.0 kPa, and the second preset temperature can be 1100°C.

[0081] S320. When the temperature inside the hot air furnace rises to a level greater than the first preset temperature but less than the second preset temperature, adjust the quick-opening valve to the fourth opening degree.

[0082] Specifically, the pressure and temperature inside the hot blast furnace are continuously monitored. When the temperature inside the hot blast furnace is greater than 300℃ but less than 1100℃, the first opening degree of the flue valve and the closed state of the bypass valve are maintained, and the quick-opening valve is adjusted to the fourth opening degree. The range of the fourth opening degree is generally smaller than the range of the third opening degree. For example, the fourth opening degree can be 5% to 10%.

[0083] S330: Control the flue gas induced draft fan to continue operating at the first frequency, so that the pressure inside the hot blast furnace is maintained within the range of the third negative pressure threshold.

[0084] The flue gas induced draft fan continues to operate at the first frequency, continuously extracting the waste gas from the hot air furnace until the pressure inside the hot air furnace is adjusted to the range of the third negative pressure threshold.

[0085] Figure 7 A flowchart illustrating another control method for a hot blast stove provided in an embodiment of the present invention. (See reference) Figure 7 Based on the above embodiments, optionally, after step S130, step S230 or step S330, when the hot blast stove is in the ignition process of the oven and the temperature inside the hot blast stove is higher than the second preset temperature, the method further includes:

[0086] S410. Continue to increase the gas supply in the hot blast stove.

[0087] As the gas supply in the hot blast stove increases, the temperature inside the stove also rises. When the temperature exceeds a second preset temperature, the pressure inside the stove can be set to a fourth negative pressure threshold. The range of the fourth negative pressure threshold is generally smaller than that of the third negative pressure threshold. For example, the fourth negative pressure threshold can be -1.0 to -1.2 kPa.

[0088] S420. When the temperature inside the hot air furnace rises to a level greater than the second preset temperature, adjust the flue valve to the fifth opening degree.

[0089] Specifically, when the temperature inside the hot blast furnace is detected to rise above 1100°C, the quick-opening valve remains at its fourth opening degree and the bypass valve remains closed, while the flue valve is adjusted to its fifth opening degree. The range of the fifth opening degree is generally larger than the range of the first opening degree; for example, the fifth opening degree can be 2 / 3 to 3 / 4.

[0090] S430: Control the flue gas induced draft fan to operate at the second frequency, so that the pressure inside the hot blast furnace is maintained within the range of the fourth negative pressure threshold.

[0091] The range of the second frequency is generally larger than that of the first frequency; for example, the second frequency can be 20–30 Hz. By increasing the operating frequency of the flue gas induced draft fan, the working efficiency of the flue gas induced draft fan can be improved, allowing the flue gas induced draft fan to extract the waste gas from the hot blast furnace more quickly, until the pressure inside the hot blast furnace is adjusted to the range of the fourth negative pressure threshold.

[0092] When the temperature inside the hot blast stove exceeds 1100℃, the pressure inside the hot blast stove is maintained within the range of the fourth negative pressure threshold until the hot blast stove is dried and shut down.

[0093] After the hot blast stove is dried and shut down, the gas and air supply for drying must be completely stopped to prevent the flue gas purification module and the flue gas induced draft fan from burning out the waste heat recovery module when drawing high-temperature airflow from the bottom of the hot blast stove. Therefore, during the drying process, the air-fuel ratio, exhaust gas volume, and exhaust gas temperature must be strictly controlled. Before the drying process is completed, the temperature of the grate support pillars inside the hot blast stove must be controlled within a range of less than 200°C.

[0094] Figure 8 A flowchart illustrating another control method for a hot blast stove provided in an embodiment of the present invention. (See reference) Figure 8 Optionally, based on the above embodiments, after step S430, when the hot blast stove is baked out, the method further includes:

[0095] S510. Adjust the flue valve to the sixth opening degree and the quick-opening valve to the fourth opening degree.

[0096] Once the target temperature for the hot blast stove is reached, the burners need to be removed and the main burner switched. When sealing the burner installation holes, to prevent burners from being scalded by the high-temperature gas inside the stove, the negative pressure inside the stove needs to be continuously controlled. The pressure value inside the hot blast stove can be set within the range of the fifth negative pressure threshold, and the flue valve should be adjusted to the sixth opening degree, and the quick-opening valve to the fourth opening degree. The range of the fifth negative pressure threshold is generally larger than the range of the fourth negative pressure threshold, and the range of the sixth opening degree is generally smaller than the range of the fifth opening degree. For example, the fifth negative pressure threshold can be -0.8 to -1.0 kPa, and the sixth opening degree can be ≤1 / 2.

[0097] S520: Control the flue gas induced draft fan to operate at the first frequency, so that the pressure inside the hot blast furnace is maintained within the range of the fifth negative pressure threshold.

[0098] The flue gas induced draft fan operates within the range of 15 to 20 Hz, gradually adjusting the pressure inside the hot blast furnace to -0.8 to -1.0 kPa.

[0099] This invention also provides an electronic device. The electronic device includes: at least one control module; and a memory communicatively connected to the at least one control module; wherein the memory stores a computer program executable by the at least one control module, the computer program being executed by the at least one control module to enable the at least one control module to execute the hot blast stove drying control method provided in any embodiment of this invention.

[0100] Figure 9 A schematic diagram of an electronic device 100 that can be used to implement embodiments of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0101] like Figure 9 As shown, the electronic device 100 includes at least one control module 101 and a memory, such as a read-only memory (ROM) 102 or a random access memory (RAM) 103, communicatively connected to the control module 101. The memory stores computer programs executable by the control module. The control module 101 can perform various appropriate actions and processes based on the computer program stored in the ROM 102 or loaded into the RAM 103 from storage unit 108. The RAM 103 may also store various programs and data required for the operation of the electronic device 100. The control module 101, ROM 102, and RAM 103 are interconnected via a bus 104. An input / output (I / O) interface 105 is also connected to the bus 104.

[0102] Multiple components in electronic device 100 are connected to I / O interface 105, including: input unit 106, such as keyboard, mouse, etc.; output unit 107, such as various types of displays, speakers, etc.; storage unit 108, such as disk, optical disk, etc.; and communication unit 109, such as network card, modem, wireless transceiver, etc. Communication unit 109 allows electronic device 100 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0103] Control module 101 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of control module 101 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various digital signal control modules (DSPs) running machine learning model algorithms, and any suitable controller, microcontroller, etc. Control module 101 performs the various methods and processes described above, such as the control methods for hot blast stove baking.

[0104] This invention also provides a computer-readable storage medium. The computer-readable storage medium stores computer instructions that, when executed by a control module, implement the hot blast stove baking control method provided in any embodiment of this invention.

[0105] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0106] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0107] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A hot blast stove drying control system, characterized in that, include: At least one hot blast stove, connected to the blast furnace, is used to provide heat energy to the blast furnace; The hot air furnace is equipped with a pressure detection module and a temperature detection module, which are used to detect the pressure and temperature inside the hot air furnace, respectively. A main flue pipe is connected to the hot blast stove, and a flue valve is installed on the main flue pipe; the main flue pipe is used to discharge the waste gas in the hot blast stove when the flue valve is opened; The waste heat recovery module has its input end connected to the main flue pipe, and its input end and output end are also connected through a bypass pipe, which is equipped with a bypass valve. A quick-opening valve is installed on the main flue pipe. The input end of the quick-opening valve is connected to the output end of the waste heat recovery module, and the output end of the quick-opening valve is connected to the chimney. A flue gas induced draft fan, wherein the input end of the flue gas induced draft fan is connected to the output end of the waste heat recovery module, and the output end of the flue gas induced draft fan is connected to the chimney; The flue gas induced draft fan is used to draw out the waste gas in the hot air furnace when the waste heat recovery module and / or bypass valve are turned on; The control module is connected to the pressure detection module, temperature detection module, flue valve, waste heat recovery module, bypass valve, quick-opening valve and flue gas induced draft fan; the control module is used to adjust the opening degree of the flue valve, the bypass valve and the quick-opening valve, as well as the frequency of the flue gas induced draft fan, according to the pressure and temperature, thereby adjusting the negative pressure value in the hot air furnace. The control module is used to adjust the flue valve to a first opening degree, adjust the quick-opening valve to a second opening degree, and fully open the bypass valve when the pressure inside the hot blast furnace is greater than the first negative pressure threshold; and control the flue gas induced draft fan to operate at a first frequency so that the pressure inside the hot blast furnace is maintained within the range of the first negative pressure threshold. After the hot blast furnace is ignited, as the temperature inside the hot blast furnace continues to increase, the negative pressure threshold is continuously reduced. By adjusting the opening of the flue valve, the bypass valve, and the quick-opening valve, and by adjusting the frequency of the flue gas induced draft fan, the flue gas inside the hot blast furnace is discharged, and the pressure inside the hot blast furnace is maintained within the set negative pressure threshold range. It also includes: multiple gas branch pipes connected to the hot blast stove; gas branch pipes are equipped with gas shut-off valves for cutting off or connecting the gas supply to the hot blast stove.

2. The hot blast stove drying control system according to claim 1, characterized in that, Also includes: The flue gas purification module has its input end connected to the output end of the waste heat recovery module, and its output end connected to the input end of the flue gas induced draft fan; the output end of the flue gas induced draft fan is connected to the chimney.

3. A method for controlling a hot blast stove, characterized in that, The method is applied to the hot blast stove drying control system according to any one of claims 1-2; the method includes: S110, Before igniting the furnace, cut off the gas supply in the hot blast stove; S120, when the pressure inside the hot air furnace is greater than the range of the first negative pressure threshold, the flue valve is adjusted to the range of the first opening degree, the quick-opening valve is adjusted to the second opening degree, and the bypass valve is fully opened. S130, control the flue gas induced draft fan to operate at a first frequency, so that the pressure inside the hot air furnace is maintained within the range of the first negative pressure threshold.

4. The control method for a hot blast stove according to claim 3, characterized in that, After step S130, when the hot air furnace is in the ignition process of the oven and the temperature inside the hot air furnace is lower than the first preset temperature, the method further includes: S210, Connect the gas supply in the hot blast stove; S220, when the pressure inside the hot air furnace is greater than the second negative pressure threshold and the temperature inside the hot air furnace is less than the first preset temperature, the bypass valve is controlled to close, and the flue valve is adjusted to the range of the first opening degree, and the quick-opening valve is adjusted to the range of the third opening degree; wherein, the range of the third opening degree is generally smaller than the second opening degree. S230, control the flue gas induced draft fan to operate at a first frequency so that the pressure inside the hot air furnace is maintained within the range of the second negative pressure threshold; wherein, the range of the second negative pressure threshold is generally smaller than the range of the first negative pressure threshold.

5. The control method for a hot blast stove according to claim 4, characterized in that, After step S130 or step S230, when the hot air furnace is in the ignition process of the oven, and the temperature inside the hot air furnace is higher than the first preset temperature and lower than the second preset temperature, the method further includes: S310, Increase the gas supply in the hot blast stove; S320, when the temperature inside the hot air furnace rises to a level greater than the first preset temperature and less than the second preset temperature, the quick-opening valve is adjusted to a fourth opening degree; wherein, the range of the fourth opening degree is generally smaller than the range of the third opening degree; S330, control the flue gas induced draft fan to continue operating at the first frequency, so that the pressure in the hot air furnace is maintained within the range of the third negative pressure threshold; wherein, the minimum value of the range of the third negative pressure threshold is less than the minimum value of the range of the second negative pressure threshold, and the maximum value of the range of the third negative pressure threshold is less than the maximum value of the range of the second negative pressure threshold.

6. The control method for a hot blast stove according to claim 5, characterized in that, After step S130, step S230, or step S330, when the hot air furnace is in the ignition process of the oven and the temperature inside the hot air furnace is higher than the second preset temperature, the method further includes: S410, continue to increase the gas supply in the hot blast stove; S420, when the temperature inside the hot air furnace rises to a level greater than the second preset temperature, the flue valve is adjusted to a fifth opening degree; wherein the range of the fifth opening degree is generally greater than the range of the first opening degree; S430, control the flue gas induced draft fan to operate at a second frequency, so that the pressure inside the hot air furnace is maintained within the range of a fourth negative pressure threshold; wherein, the range of the fourth negative pressure threshold is generally smaller than the range of the third negative pressure threshold; and the range of the second frequency is generally larger than the range of the first frequency.

7. The control method for a hot blast stove according to claim 6, characterized in that, After step S430, when the hot blast stove has finished baking, the process further includes: S510, the flue valve is adjusted to the sixth opening degree, and the quick-opening valve is adjusted to the fourth opening degree; wherein, the range of the sixth opening degree is generally smaller than the range of the fifth opening degree; S520, control the flue gas induced draft fan to operate at the first frequency, so that the pressure inside the hot air furnace is maintained within the range of the fifth negative pressure threshold; wherein, the range of the fifth negative pressure threshold is generally larger than the range of the fourth negative pressure threshold.

8. An electronic device, characterized in that, The electronic device includes: At least one control module; and A memory communicatively connected to the at least one control module; wherein, The memory stores a computer program that can be executed by the at least one control module, the computer program being executed by the at least one control module to enable the at least one control module to perform the control method for baking a hot blast stove as described in any one of claims 3-7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that are used to cause the control module to implement the control method for baking the hot blast stove as described in any one of claims 3-7.

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