Hot blast stove baking control system, control method, equipment and storage medium

Abstract

The invention discloses a hot blast stove baking control system, control method and equipment and a storage medium. The hot-blast stove baking control system comprises at least one hot-blast stove communicated with a blast furnace and providing heat energy for the blast furnace; a pressure detection module and a temperature detection module are arranged in the hot-blast stove and used for detecting pressure and temperature in the hot-blast stove; the flue header pipe is communicated with the hot blast stove, and a flue valve is arranged on the flue header pipe; when the flue valve is opened, waste gas in the hot blast stove is discharged; the input end and the output end of the waste heat recovery module are communicated through a bypass pipeline, and a bypass valve is arranged between the input end and the output end; the quick-opening valve is arranged on the flue header pipe; the input end of the flue gas induced draft fan is communicated with the output end of the waste heat recovery module, and the output end is communicated with the chimney; waste gas in the hot-blast stove is led out; the control module is used for adjusting the opening degrees of the flue valve, the bypass valve and the quick-opening valve and the frequency of the smoke induced draft fan according to the pressure and the temperature, and then the negative pressure value in the hot-blast stove is adjusted. The negative pressure adjusting effect of the hot blast stove is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hot blast furnace technology, and in particular to a hot blast furnace control system, control method, equipment and storage medium. Background Art

[0002] During the hot blast furnace baking process, when the blast furnace is shut down for a long time, the chimney temperature is low, and the height difference between the hot blast furnace's baking burner position and the chimney top is small, resulting in positive pressure in the hot blast furnace during the baking process. The baking gas fire does not smoothly enter the hot blast furnace's heat storage chamber, but blows back out, causing the equipment in the hot blast furnace's baking burner area to be burned, making it impossible to bake the furnace normally, delaying the baking and blast furnace commissioning process and even causing personal injury accidents. Summary of the invention

[0003] The invention provides a hot blast furnace control system, a control method, a device and a storage medium to improve the negative pressure regulating effect of the hot blast furnace.

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

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

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

[0007] A waste heat recovery module, wherein the input end of the waste heat recovery module is connected to the flue main pipe, and the input end and the output end of the waste heat recovery module are also connected through a bypass pipe, and a bypass valve is provided on the bypass pipe;

[0008] A quick-opening valve is arranged on the flue main 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 blast furnace when the waste heat recovery module and / or the bypass valve are turned on;

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

[0012] Optionally, the hot blast furnace baking control system also includes: a flue gas purification module, the input end of the flue gas purification module is connected to the output end of the waste heat recovery module, 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 furnace control system further includes: a plurality of gas branch pipes connected to the hot blast furnace; a gas shut-off valve is provided on the gas branch pipe for cutting off or connecting the gas supply in the hot blast furnace.

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

[0015] Cutting off the gas supply in the hot blast furnace;

[0016] When the pressure in the hot blast stove is greater than the range of the first negative pressure threshold, the flue valve is adjusted to be within the range of the first opening, the quick-opening valve is adjusted to the second opening, 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 in the hot blast stove is maintained within a range of the first negative pressure threshold.

[0018] Optionally, the control method of the hot air furnace further includes:

[0019] Connecting the gas supply in the hot blast furnace;

[0020] When the pressure in the hot blast stove is greater than the range of the second negative pressure threshold and the temperature in the hot blast stove is less than the first preset temperature, the bypass valve is controlled to be closed, and the flue valve is adjusted to be within the range of the first opening, and the quick-opening valve is adjusted to be within the range of the third opening; wherein the range of the third opening is smaller than the second opening as a whole;

[0021] The flue gas induced draft fan is controlled to operate at a first frequency so that the pressure in the hot blast stove is maintained within a range of the second negative pressure threshold; wherein the range of the second negative pressure threshold is smaller than the range of the first negative pressure threshold as a whole.

[0022] Optionally, the control method of the hot air furnace further includes:

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

[0024] When the temperature in the hot blast furnace rises to a temperature 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 smaller than the range of the third opening degree as a whole;

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

[0026] Optionally, the control method of the hot air furnace further includes:

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

[0028] When the temperature in the hot blast stove rises to be greater than the second preset temperature, the flue valve is adjusted to a fifth opening; wherein the range of the fifth opening is greater than the range of the first opening as a whole;

[0029] The flue gas induced draft fan is controlled to operate at a second frequency so that the pressure in the hot blast stove is maintained within a range of a fourth negative pressure threshold; wherein the range of the fourth negative pressure threshold is smaller than the range of the third negative pressure threshold as a whole; and the range of the second frequency is larger than the range of the first frequency as a whole.

[0030] Optionally, the control method of the hot air furnace further includes:

[0031] The flue valve is adjusted to a sixth opening, and the quick-opening valve is adjusted to the fourth opening; wherein the sixth opening range is smaller than the fifth opening range as a whole;

[0032] The flue gas induced draft fan is controlled to operate at the first frequency so that the pressure in the hot blast stove is maintained within a range of a fifth negative pressure threshold; wherein the range of the fifth negative pressure threshold is generally greater 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 in communication with the at least one control module; wherein,

[0036] The memory stores a computer program executable by the at least one control module, and the computer program is executed by the at least one control module so that the at least one control module can execute the control method of the hot blast furnace described in any embodiment of the present invention.

[0037] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a control module to implement the control method of the hot air furnace described in any embodiment of the present invention when executed.

[0038] The technical solution provided in the embodiment of the present invention can detect the pressure and temperature in the hot blast furnace by setting a pressure detection module and a temperature detection module. When the pressure in the hot blast furnace does not meet the range of the negative pressure threshold, the opening of the flue valve, the bypass valve and the quick-opening valve, as well as the frequency of the flue gas induced draft fan are controlled by the control module, thereby realizing the regulation of the pressure in the hot blast furnace. The present invention can adjust different negative pressure thresholds for different furnace temperatures, and by adjusting the opening and frequency, the pressure in the furnace is always within the set negative pressure threshold, with a good regulation effect, and will not burn the equipment in the furnace burner installation area due to high temperature heat waves.

[0039] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 is a schematic structural diagram of a hot blast furnace provided according to an embodiment of the present invention;

[0042] Figure 2 It is a structural schematic diagram of a hot blast furnace control system provided according to an embodiment of the present invention;

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

[0044] Figure 4 is a flow chart of a method for controlling a hot blast furnace provided according to an embodiment of the present invention;

[0045] Figure 5is a flow chart of another method for controlling a hot blast furnace provided according to an embodiment of the present invention;

[0046] Figure 6 is a flow chart of another method for controlling a hot blast furnace provided according to an embodiment of the present invention;

[0047] Figure 7 is a flow chart of another method for controlling a hot blast furnace provided according to an embodiment of the present invention;

[0048] Figure 8 is a flow chart of another method for controlling a hot blast furnace provided according to an embodiment of the present invention;

[0049] Fig. 9 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] The embodiment of the present invention provides a hot blast furnace baking control system. Figure 1 A schematic diagram of the structure of a hot blast furnace provided in an embodiment of the present invention, Figure 2 A schematic diagram of the structure of a hot air furnace control system provided by an embodiment of the present invention. Figure 1 and Figure 2The hot blast furnace control system includes: a flue main pipe 3, a waste heat recovery module 4, a quick-opening valve 33, a flue gas exhaust fan 5, a control module (not shown in the figure) and at least one hot blast furnace 1. The hot blast furnace 1 is connected to the blast furnace 2 and is used to provide heat energy to the blast furnace 2; the hot blast furnace 1 is built with a pressure detection module 11 and a temperature detection module 12, which are respectively used to detect the pressure and temperature in the hot blast furnace 1. The flue main pipe 3 is connected to the hot blast furnace 2, and a flue valve 31 is arranged on the flue main pipe 3; the flue main pipe 3 is used to discharge the waste gas in the hot blast furnace 1 when the flue valve 31 is opened. The input end of the waste heat recovery module 4 is connected to the flue main pipe 3, and the input end and the output end of the waste heat recovery module 4 are also connected through a bypass pipe, and a bypass valve 32 is arranged on the bypass pipe. The quick-opening valve 33 is arranged on the flue main pipe, and the input end of the quick-opening valve 33 is connected to the output end of the waste heat recovery module 4, and the output end of the quick-opening valve 33 is 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 turned on; the control module is connected with 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 of the flue valve 31, the bypass valve 32 and the quick opening valve 33, and 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] Among them, the hot blast furnace 1 is a thermal equipment integrating combustion and heat transfer processes, which is used to provide hot air flow for the blast furnace 2. A blast furnace 2 can be equipped with multiple hot blast furnaces 1. The hot blast furnace 1 is generally provided with a removable furnace burner 13, which is used to provide a sustainable ignition source for the hot blast furnace 1. When the internal pressure of the hot blast furnace 1 is positive pressure or the negative pressure value is too large, the flame in the hot blast furnace 1 may burn the equipment in the installation area of ​​the furnace burner 13.

[0054] The pressure detection module 11 and the temperature detection module 12 can detect the pressure and temperature in the hot blast stove 1 respectively, and the control module receives the pressure value and the temperature value and sets different negative pressure thresholds for different temperatures. When the control module detects that the pressure in the hot blast stove 1 does not reach the set negative pressure threshold, the control module sends a control signal and adjusts the opening 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, so as to adjust the negative pressure value in the hot blast stove 1.

[0055] Exemplarily, in the stage before the hot blast stove 1 is ignited, the negative pressure threshold in the hot blast stove 1 can be set to ≤-0.5KPa. In order to make the pressure value in the hot blast stove 1 reach the negative pressure threshold, the opening of the flue valve 31 can be adjusted to within the range of 1 / 3 to 1 / 2, the opening of the bypass valve 32 is 100%, the opening of the quick-opening valve 33 is adjusted to 20%, and the frequency of the flue gas induced draft fan 8 is set to within the range of 15 to 20Hz. Through this setting, the pressure in the hot blast stove 1 can be adjusted until it stabilizes in the range of ≤-0.5KPa. At this time, when the drying furnace burner 13 is ignited, the hot blast stove 1 will not blow back the high-temperature heat wave, nor will it cause damage to the equipment in the installation area of ​​the drying furnace burner 13.

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

[0057] The technical solution provided in the embodiment of the present invention can detect the pressure and temperature in the hot blast furnace 1 by setting a pressure detection module 11 and a temperature detection module 12. When the pressure in the hot blast furnace 1 does not meet the range of the negative pressure threshold, the opening 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 are controlled by the control module, thereby realizing the regulation of the pressure in the hot blast furnace 1. The present invention can adjust different negative pressure thresholds for different furnace temperatures, and by adjusting the opening and frequency, the pressure in the furnace always meets the set negative pressure threshold, with a good regulation effect, and will not burn the equipment in the installation area of ​​the furnace burner 13 due to high temperature heat waves.

[0058] Figure 3 A schematic diagram of another hot air furnace control system provided by an embodiment of the present invention. Figure 3 On the basis of the above embodiments, optionally, the hot blast furnace control system further includes: a flue gas purification module 7, the input end of the flue gas purification module 7 is connected to the output end of the waste heat recovery module 4, 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 can purify the exhaust gas discharged from the flue main pipe 3, and transmit the purified exhaust gas to the chimney 6 and discharge it into the atmosphere. The flue gas purification module 7 is connected to the flue gas induced draft fan 5, and the exhaust gas can be accelerated by the flue gas induced draft fan 5, so that the pressure in the hot blast furnace 1 meets the negative pressure condition.

[0060] On the basis of the above embodiments, optionally, the hot blast furnace control system further includes: a plurality of gas branch pipes connected to the hot blast furnace; a gas shut-off valve is provided on the gas branch pipe for shutting off or connecting the gas supply in the hot blast furnace.

[0061] Among them, in the stage before the hot blast furnace is ignited, in order to prevent gas from leaking into the hot blast furnace and causing gas to accumulate in front of the flue main and chimney, the gas shut-off valve can be adjusted to the lower limit position, thereby cutting off the supply of gas to the hot blast furnace, preventing accidents such as detonation and explosion in the flue main and chimney due to the gas shut-off valve not being closed tightly, which may cause the blast furnace to stop production.

[0062] The embodiment of the present invention further provides a method for controlling a hot blast furnace, which is applied to the hot blast furnace control system provided by any embodiment of the present invention. Figure 4 A flow chart of a control method for a hot blast furnace provided by an embodiment of the present invention. Figure 4 , the method comprising:

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

[0064] Before the oven is ignited, the gas shut-off valve is adjusted to the lower limit to prevent the gas in the gas branch pipe from leaking into the hot blast furnace during the oven drying process due to the gas shut-off valve not being closed tightly. Before the oven is ignited, the temperature in the hot blast furnace is relatively low, and the first negative pressure threshold can be set within the range of ≤-0.5KPa.

[0065] S120. When the pressure in the hot blast furnace is greater than the range of the first negative pressure threshold, the flue valve is adjusted to be within the range of the first opening, the quick-opening valve is adjusted to the second opening, and the bypass valve is fully opened.

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

[0067] The control module can control the flue valve to adjust to a specific opening value within the first opening range, or continuously adjust the opening of the flue valve within the first opening range according to the pressure in the hot blast furnace. This setting method has a better adjustment effect.

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

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

[0070] The technical solution provided by the embodiment of the present invention detects the pressure and temperature in the hot blast furnace, and when the pressure in the hot blast furnace does not meet the negative pressure threshold range, controls the opening of the flue valve, bypass valve and quick-opening valve, and the frequency of the flue gas induced draft fan, thereby adjusting the pressure in the hot blast furnace. The present invention can adjust different negative pressure thresholds for different furnace temperatures, and by adjusting the opening and frequency, the pressure in the furnace always meets the set conditions, has a good adjustment effect, and will not burn the equipment in the furnace burner installation area due to high temperature heat waves.

[0071] Figure 5 A flowchart of another hot air furnace control method provided by an embodiment of the present invention. Figure 5 On the basis of the above embodiments, optionally, after step S130, when the hot blast furnace is in the ignition process of the oven and the temperature in the hot blast furnace is lower than the first preset temperature, the method further includes:

[0072] S210, connecting the gas supply in the hot blast furnace.

[0073] In the process of baking the hot blast stove, the gas supply in the hot blast stove is turned on. The baking burner provides a continuous ignition source to burn the gas in the hot blast stove. During the combustion of the gas, the amount of smoke generated in the hot blast stove gradually increases. In order to improve the stability and safety of the flame in the hot blast stove, when the temperature in the stove is lower than the first preset temperature, the first negative pressure threshold in the hot blast stove is increased to the second negative pressure threshold. Exemplarily, the first preset temperature may be 300°C, and the second negative pressure threshold may be -0.5 to -0.8KPa.

[0074] S220. When the pressure in the hot blast stove is greater than the range of the second negative pressure threshold and the temperature in the hot blast stove is less than the first preset temperature, the bypass valve is controlled to close, and the flue valve is adjusted to be within the range of the first opening, and the quick opening valve is adjusted to be within the range of the third opening.

[0075] The pressure and temperature in the hot blast furnace are continuously detected. When the temperature in the hot blast furnace is less than 300°C, the bypass valve is controlled to close, the exhaust gas in the flue main is transmitted through the waste heat recovery device, and 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 smaller than the second opening range as a whole. For example, the third opening can be 10-15%.

[0076] S230, controlling the flue gas induced draft fan to operate at a first frequency so that the pressure in the hot blast furnace is maintained within a 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 maintains the first frequency operation until the pressure in the hot blast stove is adjusted to the range of -0.5 to -0.8 KPa. When the pressure in the hot blast stove is adjusted to the range of the second negative pressure threshold, the pressure and temperature in the hot blast stove are continuously detected, and the flue valve and the quick-opening valve are fine-tuned within their respective opening ranges according to different temperatures or pressures, so that the pressure in the hot blast stove can be maintained within the range of the second negative pressure threshold.

[0078] Figure 6 A flowchart of another method for controlling a hot blast furnace provided by an embodiment of the present invention. Figure 6 On the basis of the above embodiments, optionally, after step S130 or step S230, when the hot blast furnace is in the ignition process of the oven, and the temperature in the hot blast furnace 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 furnace.

[0080] Among them, when the gas supply in the hot blast stove is continuously increased, the temperature in the hot blast stove is also continuously increased. When the temperature in the hot blast stove exceeds the first preset temperature and is less than the second preset temperature, the pressure value in the hot blast stove can be set to the third negative pressure threshold. 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. Exemplarily, 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 in the hot blast furnace rises to a temperature greater than the first preset temperature and less than the second preset temperature, the quick-opening valve is adjusted to a fourth opening degree.

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

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

[0084] The exhaust fan continues to operate at the first frequency to continuously extract exhaust gas from the hot blast stove until the pressure in the hot blast stove is adjusted to within the range of the third negative pressure threshold.

[0085] Figure 7 A flowchart of another method for controlling a hot blast furnace provided by an embodiment of the present invention. Figure 7 On the basis of the above embodiments, optionally, after step S130, step S230 or step S330, when the hot blast furnace is in the ignition process of the oven and the temperature in the hot blast furnace is higher than the second preset temperature, the method further includes:

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

[0087] Among them, when the gas supply in the hot blast stove is continuously increased, the temperature in the hot blast stove is also continuously increased. When the temperature in the hot blast stove exceeds the second preset temperature, the pressure value in the hot blast stove can be set to a fourth negative pressure threshold, and the range of the fourth negative pressure threshold is generally smaller than the range of the third negative pressure threshold. Exemplarily, the fourth negative pressure threshold can be -1.0 to -1.2 KPa.

[0088] S420: When the temperature in the hot blast furnace rises to be greater than the second preset temperature, the flue valve is adjusted to a fifth opening degree.

[0089] When it is detected that the temperature in the hot blast furnace rises to more than 1100°C, the fourth opening of the quick-opening valve and the closed state of the bypass valve are maintained, and the flue valve is adjusted to the fifth opening. The range of the fifth opening is generally greater than the range of the first opening. For example, the fifth opening can be 2 / 3 to 3 / 4.

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

[0091] The second frequency range is generally greater than the first frequency range, and for example, the second frequency may be 20 to 30 Hz. By increasing the operating frequency of the flue gas induced draft fan, the working efficiency of the flue gas induced draft fan may be improved, so that the flue gas induced draft fan may extract the exhaust gas in the hot blast furnace faster, until the pressure in the hot blast furnace is adjusted to within the range of the fourth negative pressure threshold.

[0092] When the temperature in the hot blast stove is greater than 1100° C., the pressure in the hot blast stove is maintained within the range of the fourth negative pressure threshold until the hot blast stove is completely dried and stops burning.

[0093] After the hot blast furnace is finished and the burning is stopped, the gas and air of the furnace need to be completely stopped to prevent the flue gas purification module and the flue gas exhaust fan from burning the waste heat recovery module when the high-temperature airflow at the bottom of the hot blast furnace is pulled by air. Therefore, during the furnace drying process, the air-fuel ratio, the exhaust gas volume and the exhaust gas temperature must be strictly controlled. Before the furnace drying is completed, the temperature of the grate support in the hot blast furnace is required to be controlled within the range of less than 200℃.

[0094] Figure 8 A flowchart of another method for controlling a hot blast furnace provided by an embodiment of the present invention. Figure 8 On the basis of the above embodiments, optionally, after step S430, when the hot air furnace is finished, the method further includes:

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

[0096] Among them, when the target temperature of the hot blast furnace is reached, it is necessary to remove the furnace burner and switch the main burner of the hot blast furnace. When blocking the installation hole of the furnace burner, in order to prevent the high-temperature hot air inside the hot blast furnace from scalding the operators, it is necessary to continue to control the negative pressure in the hot blast furnace. The pressure value in the hot blast furnace can be set to within the range of the fifth negative pressure threshold, and the flue valve is adjusted to the sixth opening, and the quick opening valve is adjusted to the fourth opening. The range of the fifth negative pressure threshold is larger than the range of the fourth negative pressure threshold as a whole, and the range of the sixth opening is smaller than the range of the fifth opening as a whole. Exemplarily, the fifth negative pressure threshold can be -0.8 to -1.0 KPa, and the sixth opening can be ≤1 / 2.

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

[0098] Among them, the flue gas induced draft fan operates in the range of 15 to 20 Hz, so that the pressure in the hot blast furnace is gradually adjusted to -0.8 to -1.0 KPa.

[0099] An embodiment of the present invention further provides an electronic device. The electronic device includes: at least one control module; and a memory in communication connection with the at least one control module; wherein the memory stores a computer program executable by the at least one control module, and the computer program is executed by the at least one control module so that the at least one control module can execute the control method of the hot air furnace provided in any embodiment of the present invention.

[0100] Fig. 9 A schematic diagram of the structure of an electronic device 100 that can be used to implement an embodiment 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 processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0101] like Fig. 9 As shown, the electronic device 100 includes at least one control module 101, and a memory connected to the at least one control module 101 in communication, such as a read-only memory (ROM) 102, a random access memory (RAM) 103, etc., wherein the memory stores a computer program that can be executed by at least one control module, and the control module 101 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 102 or the computer program loaded from the storage unit 108 to the random access memory (RAM) 103. In the RAM 103, various programs and data required for the operation of the electronic device 100 can also be stored. The control module 101, the ROM 102, and the RAM 103 are connected to each other via a bus 104. An input / output (I / O) interface 105 is also connected to the bus 104.

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

[0103] The control module 101 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the control module 101 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various digital signal control modules (DSPs) running machine learning model algorithms, and any appropriate controllers, microcontrollers, etc. The control module 11 performs the various methods and processes described above, such as the control method of the hot air furnace.

[0104] The embodiment of the present invention further provides a computer-readable storage medium. The computer-readable storage medium stores computer instructions, which are used to enable a control module to implement the control method of the hot air furnace provided by any embodiment of the present invention when executed.

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

[0106] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0107] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A hot air stove control system, characterized in that: include: at least one hot blast stove, connected to the blast furnace and used to provide heat energy to the blast furnace; The hot blast furnace is equipped with a pressure detection module and a temperature detection module, which are used to detect the pressure and temperature in the hot blast furnace respectively; A flue main pipe is connected to the hot blast furnace, and a flue valve is provided on the flue main pipe; the flue main pipe is used to discharge the waste gas in the hot blast furnace when the flue valve is opened; A waste heat recovery module, wherein the input end of the waste heat recovery module is connected to the flue main pipe, and the input end and the output end of the waste heat recovery module are also connected through a bypass pipe, and a bypass valve is provided on the bypass pipe; A quick-opening valve is arranged on the flue main 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 blast furnace when the waste heat recovery module and / or the bypass valve are turned on; A control module is connected to the pressure detection module, the temperature detection module, the flue valve, the waste heat recovery module, the bypass valve, the quick-opening valve and the flue gas induced draft fan; the control module is used to adjust the opening 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 temperature, thereby adjusting the negative pressure value in the hot blast furnace.

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

3. The hot blast stove control system according to claim 1, characterized in that: Also includes: A plurality of gas branch pipes are connected to the hot blast furnace; a gas shut-off valve is arranged on the gas branch pipe to cut off or connect the gas supply in the hot blast furnace.

4. A control method for a hot blast furnace, characterized in that: Applicable to the hot blast stove baking control system according to any one of claims 1 to 3; the method comprises: Cutting off the gas supply in the hot blast furnace; When the pressure in the hot blast stove is greater than the range of the first negative pressure threshold, the flue valve is adjusted to be within the range of the first opening, the quick-opening valve is adjusted to the second opening, and the bypass valve is fully opened; The flue gas induced draft fan is controlled to operate at a first frequency so that the pressure in the hot blast stove is maintained within a range of the first negative pressure threshold.

5. The control method of the hot blast stove according to claim 4, characterized in that: Also includes: Connecting the gas supply in the hot blast furnace; When the pressure in the hot blast stove is greater than the range of the second negative pressure threshold and the temperature in the hot blast stove is less than the first preset temperature, the bypass valve is controlled to be closed, and the flue valve is adjusted to be within the range of the first opening, and the quick-opening valve is adjusted to be within the range of the third opening; wherein the range of the third opening is smaller than the second opening as a whole; The flue gas induced draft fan is controlled to operate at a first frequency so that the pressure in the hot blast stove is maintained within a range of the second negative pressure threshold; wherein the range of the second negative pressure threshold is smaller than the range of the first negative pressure threshold as a whole.

6. The control method of the hot blast stove according to claim 5, characterized in that: Also includes: Increasing the gas supply in the hot blast stove; When the temperature in the hot blast furnace rises to a temperature 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 smaller than the range of the third opening degree as a whole; The flue gas induced draft fan is controlled to continue to operate at the first frequency so that the pressure in the hot blast furnace is maintained within a range of a third negative pressure threshold; wherein a minimum value of the range of the third negative pressure threshold is smaller than a minimum value of the range of the second negative pressure threshold, and a maximum value of the range of the third negative pressure threshold is smaller than a maximum value of the range of the second negative pressure threshold.

7. The control method of the hot blast stove according to claim 6, characterized in that: Also includes: Continue to increase the gas supply in the hot blast stove; When the temperature in the hot blast stove rises to be greater than the second preset temperature, the flue valve is adjusted to a fifth opening; wherein the range of the fifth opening is greater than the range of the first opening as a whole; The flue gas induced draft fan is controlled to operate at a second frequency so that the pressure in the hot blast stove is maintained within a range of a fourth negative pressure threshold; wherein the range of the fourth negative pressure threshold is smaller than the range of the third negative pressure threshold as a whole; and the range of the second frequency is larger than the range of the first frequency as a whole.

8. The control method of the hot blast stove according to claim 7, characterized in that: Also includes: The flue valve is adjusted to a sixth opening, and the quick-opening valve is adjusted to the fourth opening; wherein the sixth opening range is smaller than the fifth opening range as a whole; The flue gas induced draft fan is controlled to operate at the first frequency so that the pressure in the hot blast stove is maintained within a range of a fifth negative pressure threshold; wherein the range of the fifth negative pressure threshold is generally greater than the range of the fourth negative pressure threshold.

9. An electronic device, characterized in that: The electronic device comprises: at least one control module; and A memory in communication with the at least one control module; wherein, The memory stores a computer program executable by the at least one control module, and the computer program is executed by the at least one control module so that the at least one control module can execute the control method of the hot blast stove according to any one of claims 4 to 8.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the control module to implement the control method of the hot blast furnace according to any one of claims 4 to 8 when executed.

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