Hot blast stove system and control method thereof

Abstract

The invention discloses a hot blast stove system and a control method thereof. The hot blast stove system comprises a blast furnace; each hot air furnace is provided with a hot air outlet, a cold air inlet, a coal gas inlet, an air inlet, a waste air outlet and a smoke outlet, the hot air outlet is provided with a hot air valve, the cold air outlet is provided with a cold air valve, the coal gas inlet is provided with a coal gas valve, the air inlet is provided with an air valve, and the waste air outlet is provided with a waste air valve; the waste air valve is connected with the air pipeline through a waste air pipeline, and the flue gas outlet is provided with a flue gas valve; and the control device is configured to firstly control the waste air valve to be opened and then control the air valve to be opened when the hot blast stove is switched from the air supply mode to the combustion mode. Waste air in the hot-blast stove is discharged into the air pipeline, the internal pressure of the air pipeline and the hot-blast stove is balanced, the damage probability of an air valve is reduced, heat energy of the waste air is recycled, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of blast furnace metallurgy, and in particular relates to a hot blast furnace system and a control method thereof. Background Art

[0002] In modern blast furnace smelting, hot blast furnaces are crucial for providing hot air. These furnaces require combustion-supporting air, which enters the furnace through an air valve. However, due to the large pressure differential between the inside and outside of the furnace, the air valve is prone to damage when open, impacting normal operation. Summary of the Invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a hot air furnace system and a control method thereof, which reduces the probability of air valve damage and recycles the heat energy of waste air to improve energy utilization efficiency.

[0004] In a first aspect, the present application provides a hot blast furnace system, comprising:

[0005] blast furnace;

[0006] Multiple hot blast furnaces, each of which is equipped with a hot blast outlet, a cold blast inlet, a gas inlet, an air inlet, a waste blast outlet, and a flue gas outlet. The hot blast outlet is equipped with a hot blast valve, which is connected to the blast furnace via a hot blast pipeline. The cold blast outlet is equipped with a cold blast valve. The gas inlet is equipped with a gas valve. The air inlet is equipped with an air valve, which is connected to the fan via an air pipeline. The waste blast outlet is equipped with a waste blast valve, which is connected to the air pipeline via a waste blast pipeline. The flue gas outlet is equipped with a flue gas valve.

[0007] A control device is electrically connected to the hot air valve, cold air valve, gas valve, air valve, waste air valve and flue gas valve. The hot air stove has a combustion mode and an air supply mode. The control device is configured to, when the hot air stove is in the combustion mode, control the hot air valve, cold air valve and waste air valve to close, and control the gas valve, air valve and flue gas valve to open; when the hot air stove is in the air supply mode, control the hot air valve and cold air valve to open, and control the waste air valve, gas valve, air valve and flue gas valve to close; when the hot air stove is switched from the air supply mode to the combustion mode, after the cold air valve and the hot air valve are closed, first control the waste air valve to open, and then control the air valve to open.

[0008] According to the hot air furnace system of the present application, the design of opening the waste air valve first when the hot air furnace switches from the air supply mode to the combustion mode effectively reduces the internal and external pressure difference that the air valve withstands when it is opened, significantly reduces the chance of damage to the air valve, extends the service life of the air valve, and reduces equipment maintenance costs; at the same time, the heat energy of the waste air is recovered and utilized, and added to the air pipeline to increase the temperature of the combustion air, which helps to improve combustion efficiency and realize the reasonable recovery and reuse of energy, thereby improving energy utilization efficiency, meeting the industrial production needs of energy conservation and emission reduction, and having high economic value and environmental protection significance.

[0009] According to one embodiment of the present application, the air inlet is further provided with an air regulating valve connected in series with the air valve, the gas inlet is further provided with a gas regulating valve connected in series with the gas valve, the exhaust air outlet is further provided with an exhaust air regulating valve connected in series with the exhaust air valve, and a first temperature detector is provided on the top of the hot air furnace;

[0010] The first temperature detector, the air regulating valve, the gas regulating valve and the exhaust air regulating valve are all electrically connected to the control device. Some of the multiple hot blast stoves are in air supply mode, and the rest are in combustion mode. When the exhaust air valve of a hot blast stove is open, the control device is configured to adjust the opening of the air regulating valve and the gas regulating valve of the hot blast stove corresponding to the combustion mode, as well as the exhaust air regulating valve corresponding to the opened exhaust air valve, according to the top temperature value of the hot blast stove in combustion mode.

[0011] According to one embodiment of the present application, the gas inlet is further provided with a gas shut-off valve. The gas shut-off valve, the gas regulating valve, and the gas valve are sequentially connected in series in a direction close to the gas inlet. A gas release pipeline is connected between the gas regulating valve and the gas valve, and a gas release valve is provided on the gas release pipeline.

[0012] The gas shut-off valve and the gas release valve are both electrically connected to the control device, which is configured to control the gas release valve to close when the hot blast stove is in combustion mode; and to control the gas release valve to open when the hot blast stove is in air supply mode.

[0013] According to one embodiment of the present application, the flue gas valve is connected to the flue gas treatment equipment through a flue gas pipeline, and the gas valve is connected to the gas supply equipment through a gas pipeline. The hot blast furnace system further includes:

[0014] Air heat exchanger, the medium flow channel of the air heat exchanger is connected in series to the flue gas pipeline, and the heat exchange flow channel of the air heat exchanger is connected in series to the air pipeline;

[0015] The gas heat exchanger has a medium flow channel connected in series to the flue gas pipeline, and a heat exchange flow channel connected in series to the gas pipeline.

[0016] According to one embodiment of the present application, the air circuit includes:

[0017] The air main pipe and the exhaust air pipe are connected to the air main pipe;

[0018] Multiple air branch pipes correspond to the air valves of multiple hot blast furnaces one by one and are connected between the air valves and the air main pipe;

[0019] The first air supply branch pipe and the second air supply branch pipe are connected in parallel between the fan and the air main pipe. The heat exchange channel of the air heat exchanger is connected in series to one of the first air supply branch pipe and the second air supply branch pipe. The first air supply branch pipe is provided with a first air supply valve, and the second air supply branch pipe is provided with a second air supply valve. The first air supply valve and the second air supply valve are both electrically connected to the control device.

[0020] According to one embodiment of the present application, the smoke outlet includes a first smoke outlet and a second smoke outlet, the smoke valve includes a first smoke valve provided at the first smoke outlet and a second smoke valve provided at the second smoke outlet, and the second smoke outlet is further provided with a smoke collection valve connected in parallel with the second smoke valve;

[0021] The first flue gas valve, the second flue gas valve and the smoke collection valve are all electrically connected to the control device. The control device is configured to control the first flue gas valve, the second flue gas valve and the smoke collection valve to be closed when the hot blast stove is in the air supply mode; and to control the first flue gas valve, the second flue gas valve and the smoke collection valve to be open when the hot blast stove is in the combustion mode.

[0022] According to one embodiment of the present application, the cold air inlet is further provided with a cold air regulating valve connected in series with the cold air valve, and a cold air pressure equalizing valve connected in parallel with the cold air valve and the cold air regulating valve;

[0023] The cold air regulating valve and the cold air equalizing pressure valve are both electrically connected to the control device. The control device is configured to control the cold air equalizing pressure valve and the cold air regulating valve to close when the hot air stove is in combustion mode; when the hot air stove switches from combustion mode to air supply mode, the cold air equalizing pressure valve is controlled to open before controlling the cold air valve to open.

[0024] In a second aspect, the present application provides a control method for a hot blast furnace system according to the first aspect, wherein the air inlet is further provided with an air regulating valve connected in series with the air valve, the gas inlet is further provided with a gas shut-off valve, the gas shut-off valve and the gas valve are sequentially connected in series in a direction approaching the gas inlet, a gas release pipeline is connected between the gas shut-off valve and the gas valve, the gas release pipeline is provided with a gas release valve, the hot blast furnace is provided with a first pressure sensor, the air pipeline is provided with a second pressure sensor, and both the first pressure sensor and the second pressure sensor are electrically connected to the control device;

[0025] When the hot air furnace switches from air supply mode to combustion mode, the control method includes:

[0026] Control the cold air valve and hot air valve to close;

[0027] Controlling the exhaust air valve to open, and obtaining a first pressure value in the hot air furnace and a second pressure value in the air pipeline;

[0028] When the first pressure value is equal to the second pressure value, the air valve and the flue valve are controlled to open;

[0029] Control the exhaust air valve to close;

[0030] Control the gas valve to open and the gas release valve to close;

[0031] Control the air regulating valve to open to the preset opening;

[0032] Control the gas shut-off valve to open;

[0033] Control the gas valve to open to the preset opening.

[0034] According to the control method provided in the embodiment of the present application, through a reasonable valve control sequence and pressure balance adjustment, the hot blast furnace is switched from the air supply mode to the combustion mode in a safe, stable and efficient manner, thereby improving the overall performance and operational safety of the hot blast furnace system, significantly reducing the probability of damage to the air valve, extending the service life of the air valve, and reducing equipment maintenance costs; at the same time, the heat energy of the waste air is recovered and utilized and added to the air pipeline to increase the temperature of the combustion air, which helps to improve the combustion efficiency and realize the reasonable recovery and reuse of energy, thereby improving the energy utilization efficiency, meeting the industrial production needs of energy conservation and emission reduction, and having high economic value and environmental protection significance.

[0035] According to one embodiment of the present application, a second temperature detector is provided at the gas outlet, and the second temperature detector is electrically connected to the control device. After the hot air furnace is switched to the combustion mode, the control method further includes:

[0036] Get the flue gas temperature of the hot blast stove;

[0037] When the flue gas temperature reaches a first preset temperature threshold, the gas regulating valve and the gas shut-off valve are controlled to close in sequence;

[0038] Control the gas release valve to open.

[0039] According to one embodiment of the present application, when the hot blast furnace switches from the combustion mode to the air supply mode, the control method includes:

[0040] Control the gas regulating valve to close;

[0041] Control the gas shut-off valve to close;

[0042] Control the gas release valve to open and record the first duration;

[0043] When the first time duration reaches a first time threshold, controlling the air regulating valve to close, and recording a second time duration;

[0044] When the second time period reaches a second time threshold, controlling the gas valve to close;

[0045] Control air valve closed;

[0046] Control the smoke valve to close;

[0047] Control the cold air valve and hot air valve to open.

[0048] In a third aspect, the present application provides a control device for a hot blast furnace system, the device comprising:

[0049] The first control module is used to control the cold air valve and the hot air valve to close;

[0050] a second control module, configured to control the exhaust air valve to open, and obtain a first pressure value in the hot air furnace and a second pressure value in the air pipeline;

[0051] a third control module, configured to control the air valve and the flue valve to open when the first pressure value is equal to the second pressure value;

[0052] A fourth control module, used for controlling the exhaust air valve to close;

[0053] A fifth control module, used for controlling the opening of the gas valve and the closing of the gas release valve;

[0054] a sixth control module, configured to control the air regulating valve to open to a preset opening;

[0055] a seventh control module, for controlling the opening of the gas shut-off valve;

[0056] The eighth control module is used to control the gas valve to open to a preset opening.

[0057] According to the control device of the hot blast furnace system of the present application, through reasonable valve control sequence and pressure balance adjustment, the safe, stable and efficient switching of the hot blast furnace from the air supply mode to the combustion mode is achieved, thereby improving the overall performance and operational safety of the hot blast furnace system, significantly reducing the probability of air valve damage, extending the service life of the air valve, and reducing equipment maintenance costs; at the same time, the heat energy of the waste air is recovered and utilized, and added to the air pipeline to increase the temperature of the combustion air, which helps to improve combustion efficiency and realize the reasonable recovery and reuse of energy, thereby improving energy utilization efficiency, meeting the industrial production needs of energy conservation and emission reduction, and having high economic value and environmental protection significance.

[0058] In a fourth aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the control method for the hot blast furnace system according to the second aspect described above is implemented.

[0059] In a fifth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the control method of the hot blast furnace system according to the second aspect described above is implemented.

[0060] In a sixth aspect, the present application provides a chip, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run programs or instructions to implement the control method of the hot blast furnace system as in the second aspect.

[0061] In a seventh aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the control method of the hot blast stove system according to the second aspect.

[0062] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0064] Figure 1 Schematic diagram of the structure of the hot blast furnace system provided in the embodiment of the present application;

[0065] Figure 2 This is a partial structural diagram of the hot blast furnace system provided in the embodiment of the present application.

[0066] Figure 3 1 is a flow chart of a control method for a hot blast stove system provided in an embodiment of the present application;

[0067] Figure 4 Schematic diagram of the structure of the control device of the hot blast furnace system provided in an embodiment of the present application;

[0068] Figure 5 It is a structural diagram of the electronic device of the system of the embodiment of the present application.

[0069] Reference numerals:

[0070] 100. Hot blast furnace system; 1. Blast furnace; 2. Hot blast furnace; 3. Hot blast valve; 4. Cold blast valve; 5. Cold blast regulating valve; 6. Cold blast equalizing valve; 7. Gas valve; 8. Gas regulating valve; 9. Gas shut-off valve; 10. Gas release valve; 11. Air valve; 12. Air regulating valve; 13. Exhaust air valve; 14. Exhaust air regulating valve; 15. Flue gas valve; 15a. First flue gas valve; 15b. Second flue gas valve; 16. Flue gas extraction valve; 17. First temperature detector; 18. Second temperature detector; 19. Air heat exchanger; 20. Gas exchanger Heater; 21. Fan; 22. Air pipeline; 22a. Air main; 22b. Air branch; 22c. First air supply branch; 22d. Second air supply branch; 22e. First air supply valve; 22f. Second air supply valve; 22g. Air release valve; 23. Cold air pipeline; 23a. Cold air main; 23b. Cold air branch; 23c. Mixing air pipe; 234. Mixing air valve; 24. Hot air pipeline; 25. Exhaust air pipeline; 26. Gas pipeline; 27. Gas treatment equipment; 28. Cold air supply equipment; 29. ​​Gas supply equipment;

[0071] 31. First control module; 32. Second control module; 33. Third control module; 34. Fourth control module; 35. Fifth control module; 36. Sixth control module; 37. Seventh control module; 38. Eighth control module;

[0072] 500. Electronic device; 501. Processor; 502. Memory. DETAILED DESCRIPTION

[0073] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0074] Reference below Figure 1-Figure 2 A hot air stove system according to an embodiment of the present application is described.

[0075] See also Figure 1 and Figure 2 According to some embodiments of the present application, a hot blast stove system 100 includes a blast furnace 1, a plurality of hot blast stoves 2 and a control device.

[0076] The blast furnace 1 is the main equipment for receiving hot blast provided by the hot blast stove 2 and performing smelting in the blast furnace 1.

[0077] Each hot blast furnace 2 is provided with a hot air outlet, a cold air inlet, a gas inlet, an air inlet, a waste air outlet and a flue gas outlet. The hot air outlet is provided with a hot air valve 3, which is connected to the blast furnace 1 through a hot air pipeline 24. The cold air outlet is provided with a cold air valve 4. The gas inlet is provided with a gas valve 7. The air inlet is provided with an air valve 11, which is connected to the fan 21 through an air pipeline 22. The waste air outlet is provided with a waste air valve 13, which is connected to the air pipeline 22 through a waste air pipeline 25. The flue gas outlet is provided with a flue gas valve 15.

[0078] The number of hot blast stoves 2 is not specifically limited, and can be two, three, four or more than four. Taking four hot blast stoves 2 as an example, the four hot blast stoves 2 can be arranged in parallel, relatively independently but also serve the blast furnace 1 together.

[0079] The hot air outlet, cold air inlet, gas inlet, air inlet, waste air outlet, and flue gas outlet provided on each hot blast furnace 2 serve as interfaces for implementing the different functions of the hot blast furnace 2. The hot air valve 3 provided at the hot air outlet is a switch component that controls the outflow of hot air. It is connected to the blast furnace 1 via the hot air pipeline 24 and can transport the hot air generated by the hot blast furnace 2 to the blast furnace 1. The cold air valve 4 provided at the cold air inlet controls the entry of cold air. The gas valve 7 provided at the gas inlet controls the input of gas. The air valve 11 provided at the air inlet is connected to the fan 21 via the air pipeline 22. The combustion-supporting air generated by the fan 21 enters the hot blast furnace 2 through the air pipeline 22 and the air valve 11. The waste air valve 13 provided at the waste air outlet is connected to the air pipeline 22 via the waste air pipeline 25. It is used to discharge the waste air from the hot blast furnace 2 and introduce it into the air pipeline 22. The flue gas valve 15 provided at the flue gas outlet discharges the flue gas generated by combustion. These valves are all common pipeline control valves, such as butterfly valves, gate valves, etc. Their structural characteristics are that they can realize the on-off control of the medium in the pipeline.

[0080] The control device is electrically connected to the hot air valve 3, the cold air valve 4, the gas valve 7, the air valve 11, the waste air valve 13 and the flue gas valve 15. The hot air stove 2 has a combustion mode and an air supply mode. The control device is configured as follows: when the hot air stove 2 is in the combustion mode, the hot air valve 3, the cold air valve 4 and the waste air valve 13 are controlled to be closed, and the gas valve 7, the air valve 11 and the flue gas valve 15 are controlled to be open; when the hot air stove 2 is in the air supply mode, the hot air valve 3 and the cold air valve 4 are controlled to be open, and the waste air valve 13, the gas valve 7, the air valve 11 and the flue gas valve 15 are controlled to be closed; when the hot air stove 2 is switched from the air supply mode to the combustion mode, after the cold air valve 4 and the hot air valve 3 are closed, the waste air valve 13 is controlled to be opened first, and then the air valve 11 is controlled to be opened.

[0081] The control device is electrically connected to each valve and can be an industrial control computer, programmable logic controller (PLC), or similar device. Its function is to precisely control each valve according to the different operating states of the hot blast furnace 2. In combustion mode, the hot blast valve 3, cold blast valve 4, and waste air valve 13 are closed, while the gas valve 7, air valve 11, and flue gas valve 15 are opened, allowing gas and air to enter the hot blast furnace 2 for combustion. The resulting flue gas is then discharged through the flue gas valve 15. In air supply mode, the hot blast valve 3 and cold blast valve 4 are opened, while the other valves are closed. The heated cold air is then delivered to the blast furnace 1 through the hot blast valve 3. When the hot blast furnace 2 switches from air supply mode to combustion mode, after closing the cold blast valve 4 and hot blast valve 3, the waste air valve 13 is opened first, allowing the high-pressure hot exhaust gas remaining in the hot blast furnace 2 to balance the pressure in the air pipeline 22 with that in the hot blast furnace 2. The air valve 11 is then opened to ensure safe opening.

[0082] In actual implementation, when the hot blast furnace 2 switches from the air supply mode to the combustion mode, the cold air valve 4 and the hot air valve 3 are closed first to prevent the cold air from entering and the hot air from leaking out. At this time, a large amount of high-pressure exhaust gas that has not yet been discharged is still accumulated in the hot blast furnace 2. If the air valve 11 is opened directly, it is easy to cause damage to the air valve 11. By opening the waste air valve 13, the high-pressure hot exhaust gas in the hot blast furnace 2 is discharged into the air pipe 22 through the waste air pipe 25, so as to achieve pressure balance between the air pipe 22 and the hot blast furnace 2. Finally, the air valve 11 is opened to allow the combustion air to smoothly enter the hot blast furnace 2 and enter the combustion mode.

[0083] According to the hot blast furnace system 100 provided in the embodiment of the present application, the design of first opening the waste air valve 13 when the hot blast furnace 2 switches from the air supply mode to the combustion mode effectively reduces the internal and external pressure difference that the air valve 11 withstands when it is opened, significantly reduces the probability of damage to the air valve 11, extends the service life of the air valve 11, and reduces equipment maintenance costs; at the same time, the heat energy of the waste air is recovered and utilized, and added to the air pipeline 22 to increase the temperature of the combustion air, which helps to improve the combustion efficiency and realize the reasonable recovery and reuse of energy, thereby improving the energy utilization efficiency, meeting the industrial production needs of energy conservation and emission reduction, and having high economic value and environmental protection significance.

[0084] See also Figure 1 and Figure 2 According to some embodiments of the present application, the air inlet may further be provided with an air regulating valve 12 connected in series with the air valve 11, the gas inlet may further be provided with a gas regulating valve 8 connected in series with the gas valve 7, the exhaust air outlet may further be provided with an exhaust air regulating valve 14 connected in series with the exhaust air valve 13, and a first temperature detector 17 is provided at the top of the hot air furnace 2.

[0085] The air control valve 12 is installed in series with the air valve 11 at the air inlet. Common structures include electric control valves and pneumatic control valves. Its function is to adjust the amount of combustion air entering the hot air furnace 2 by controlling the air flow. For example, an electric control valve uses a motor to drive the valve core to change the flow area between the valve core and the valve seat, thereby achieving precise adjustment of the air flow.

[0086] Gas regulating valve 8, installed in series with gas valve 7 at the gas inlet, can also be of various types, such as self-operated regulating valves and electric proportional regulating valves. Its structural characteristic is its ability to adjust the gas input according to a control signal to meet the required gas volume for combustion. For example, a self-operated regulating valve requires no external power source and relies on changes in gas pressure to adjust the valve opening.

[0087] The exhaust air regulating valve 14 is connected in series with the exhaust air valve 13 at the exhaust air outlet. Its working principle is similar to that of a common regulating valve and will not be described here. It can control the exhaust air discharge flow rate.

[0088] The first temperature detector 17 , the air regulating valve 12 , the gas regulating valve 8 and the exhaust air regulating valve 14 may all be electrically connected to the control device.

[0089] All three control valves are electrically connected to a control device. This connection can be wired, such as transmitting control signals via cables, or wireless, such as using an industrial wireless network to transmit data. The control device can send control commands to the control valve in real time, and the control valve can also provide feedback on its status to the control device.

[0090] Some of the multiple hot blast stoves 2 are in air supply mode, and the rest are in combustion mode. When the waste air valve 13 of a certain hot blast stove 2 is open, the control device can be configured to adjust the opening of the air regulating valve 12 and the gas regulating valve 8 of the hot blast stove 2 in combustion mode, as well as the waste air regulating valve 14 corresponding to the opened waste air valve 13, according to the top temperature value of the hot blast stove 2 in combustion mode.

[0091] It should be noted that the hot blast furnace 2 heats the furnace wall in the combustion mode. When the temperature is heated to meet the air supply requirements, it can switch from the combustion mode to the air supply mode. After the cold air enters the hot blast furnace 2, it is heated to a certain temperature and then transported to the blast furnace 1 through the hot air port for use by the blast furnace 1. As the air supply progresses, the temperature in the hot blast furnace 2 gradually decreases to a point where it cannot meet the hot air temperature requirements of the blast furnace 1. The hot blast furnace 2 is then controlled to switch from the air supply mode to the combustion mode for the next air supply. By setting up multiple hot blast furnaces 2, some of which are in the air supply mode and the rest are in the combustion mode, multiple hot blast furnaces 2 are alternately supplied with air to ensure the hot air supply to the blast furnace 1 at all times.

[0092] When the exhaust air valve 13 of a hot blast stove 2 is open, meaning that the hot blast stove 2 is switching from air supply mode to combustion mode, the hot exhaust gas from that stove 2 will enter the air pipe 22, as the air pipes 22 of multiple hot blast stoves 2 are interconnected. This will increase the temperature of the combustion air in other hot blast stoves 2 currently in combustion mode. At this point, the control device adjusts the temperature based on the top temperature of the hot blast stove 2 in combustion mode. This top temperature can be obtained using a first temperature detector 17 located at the top of the hot blast stove 2. This first temperature detector 17 can be a thermocouple temperature sensor, a thermal resistor temperature sensor, or the like.

[0093] In actual implementation, when it is detected that the exhaust air valve 13 of a hot blast furnace 2 is open, the control device obtains the top temperature of the hot blast furnace 2 in combustion mode in real time. For example, if the temperature value has an upward trend or is close to a set threshold (such as 1380°C), the control device reduces the opening of the exhaust air regulating valve 14 corresponding to the open exhaust air valve 13 according to the preset adjustment logic, reduces the exhaust air discharge speed, and simultaneously reduces the opening of the air regulating valve 12 and the gas regulating valve 8 of the hot blast furnace 2 in combustion mode, reduces the input of combustion-supporting air and gas, and reduces the combustion intensity, thereby controlling the temperature of the hot blast furnace 2 not to exceed the threshold; if the temperature value is lower than the set threshold, the control device appropriately increases the opening of the exhaust air regulating valve 14 to improve the exhaust air discharge efficiency, increases the opening of the air regulating valve 12 and the gas regulating valve 8, and maintains a reasonable combustion temperature and efficiency.

[0094] According to the hot blast furnace system 100 provided in the embodiment of the present application, regulating valves are respectively provided at the air inlet, gas inlet, and exhaust air outlet, and the control device adjusts the opening according to the temperature value at the top of the hot blast furnace 2. This effectively solves the problem of abnormal temperature rise in hot blast furnaces 2 in other combustion modes due to exhaust air discharged from a hot blast furnace 2. Refractory burnout caused by excessively high dome temperature is avoided, the service life of the hot blast furnace 2 is extended, and equipment maintenance costs are reduced. At the same time, the generation of NO compounds is reduced, meeting environmentally friendly production requirements, and ensuring that each hot blast furnace 2 can operate stably, maintaining the entire hot blast furnace system 100 to provide hot air to the blast furnace 1 efficiently and stably.

[0095] See also Figure 1 and Figure 2 According to some embodiments of the present application, the gas inlet may also be provided with a gas shut-off valve 9. The gas shut-off valve 9, the gas regulating valve 8 and the gas valve 7 are connected in series in the direction close to the gas inlet. A gas release pipeline is connected between the gas regulating valve 8 and the gas valve 7, and a gas release valve 10 is provided on the gas release pipeline.

[0096] The gas shutoff valve 9 is located near the gas inlet and is connected in series with the gas regulating valve 8 and the gas valve 7. Common types of shutoff valves include electric gate valves and pneumatic butterfly valves. These valves have excellent sealing properties and can quickly cut off the gas supply in an emergency to prevent further gas flow into the hot blast furnace 2. For example, an electric gate valve uses an electric device to drive the gate plate up and down to open and close the valve. When fully closed, it can effectively cut off the gas flow.

[0097] The gas release line, connected between the gas regulating valve 8 and the gas valve 7, is a dedicated gas discharge line. It is typically made of metal, offering adequate pressure and corrosion resistance. One end of the gas release line is connected to the pipeline between the gas regulating valve 8 and the gas valve 7, while the other end leads to a safe release area. A gas release valve 10, such as a ball valve or globe valve, is installed on the gas release line. The primary function of the gas release valve 10 is to properly control gas emissions from the gas line 26 under different operating conditions of the hot blast furnace 2.

[0098] The gas release valve 10 and the gas shut-off valve 9 are both electrically connected to the control device, and the connection method can be a conventional industrial control line connection or a wireless network communication connection.

[0099] The control device is configured to control the gas release valve 10 to be closed when the hot blast stove 2 is in the combustion mode; and to control the gas release valve 10 to be open when the hot blast stove 2 is in the air supply mode.

[0100] In actual operation, when the hot blast furnace 2 is in combustion mode, the control device controls the gas release valve 10 to close. At this time, the gas normally enters the hot blast furnace 2 through the gas shut-off valve 9, the gas regulating valve 8, and the gas valve 7 to participate in combustion. When the hot blast furnace 2 switches to air supply mode, the control device controls the gas shut-off valve 9 to close, cutting off the gas supply, and simultaneously controls the gas release valve 10 to open, allowing the gas remaining in the pipe section between the gas regulating valve 8 and the gas valve 7 to be discharged to a safe area through the gas release pipeline. This can prevent the residual gas in the pipeline or the gas leaking from the gas pipeline 26 from entering the hot blast furnace 2 for various reasons when the hot blast furnace 2 is in air supply mode, mixing with the hot gas in the furnace to form explosive gas, thereby effectively preventing the occurrence of explosion accidents.

[0101] By installing a gas shutoff valve 9, a gas release pipeline, and a gas release valve 10 at the gas inlet, and by using a control device to precisely control the hot blast furnace 2 according to its operating status, the safety of gas use in the hot blast furnace system 100 is greatly improved. This effectively avoids the risk of explosion caused by gas leakage mixing with the hot gas in the hot blast furnace 2, ensures the safe and stable operation of the equipment, reduces the possibility of safety accidents, and also reduces the potential losses such as equipment damage and casualties caused by potential safety accidents, thus providing a strong guarantee for the safe and efficient operation of metallurgical production.

[0102] See also Figure 1 and Figure 2 According to some embodiments of the present application, the flue gas valve 15 can be connected to the flue gas treatment equipment through a flue gas pipeline, and the gas valve 7 can be connected to the gas supply equipment 29 through a gas pipeline 26.

[0103] The flue gas pipeline transports the flue gas generated by the hot blast furnace 2 to the flue gas treatment equipment. It is typically made of high-temperature and corrosion-resistant metal, and its diameter is designed based on the flue gas flow rate. The flue gas treatment equipment can be a combination of desulfurization towers, denitrification units, and dust collectors. Its function is to purify the flue gas to meet environmental emission standards before it is discharged into the atmosphere.

[0104] Gas pipeline 26 is used to transport gas provided by gas supply equipment 29 to hot blast furnace 2. It is also made of piping materials that meet gas transportation requirements and have good sealing and pressure resistance. Gas supply equipment 29 can be a gas generator, gas storage tank, etc., responsible for storing and supplying the gas required for combustion in hot blast furnace 2.

[0105] The hot blast stove system 100 also includes an air heat exchanger 19 and a gas heat exchanger 20. The medium flow channel of the air heat exchanger 19 is connected in series to the flue gas pipeline, and the heat exchange flow channel of the air heat exchanger 19 is connected in series to the air pipeline 22; the medium flow channel of the gas heat exchanger 20 is connected in series to the flue gas pipeline, and the heat exchange flow channel of the gas heat exchanger 20 is connected in series to the gas pipeline 26.

[0106] The medium flow channel of the air heat exchanger 19 is connected in series to the flue gas pipeline, and the heat exchange flow channel is connected in series to the air pipeline 22. Common types of air heat exchangers 19 include plate heat exchangers, shell and tube heat exchangers, etc. Taking the plate heat exchanger as an example, it is composed of a series of stacked metal plates with a certain corrugated shape, and thin rectangular channels are formed between the plates, and heat exchange is carried out through the plates. The medium flow channel is used to allow high-temperature flue gas to pass through, and the heat exchange flow channel is used to allow combustion air to pass through. Its structural characteristics are large heat exchange area and high heat transfer efficiency. Its function is to use the waste heat of the flue gas to preheat the combustion air, increase the temperature of the combustion air, and thus improve the combustion efficiency of the hot blast furnace 2.

[0107] The medium flow channel of the gas heat exchanger 20 is connected in series to the flue gas pipeline, and the heat exchange channel is connected in series to the gas pipeline 26. Its structure and operating principle are similar to those of the air heat exchanger 19, and it can also adopt a plate heat exchanger or a shell and tube heat exchanger. The function of the gas heat exchanger 20 is to use the waste heat of the flue gas to preheat the gas, raising the gas temperature before entering the hot blast furnace 2 for combustion, thereby promoting more complete combustion of the gas and improving energy efficiency.

[0108] The flue gas discharged from the flue gas outlet of the hot blast furnace 2 flows through the flue gas valve 15, the medium flow channel of the air heat exchanger 19, and the medium flow channel of the gas heat exchanger 20 in sequence, and finally enters the flue gas treatment equipment through the flue gas pipeline; the coal gas from the gas supply equipment 29 first flows through the heat exchange channel of the gas heat exchanger 20 to be preheated, and then enters the hot blast furnace 2 through the gas pipeline 26 and the gas valve 7; the combustion-supporting air generated by the fan 21 first flows through the heat exchange channel of the air heat exchanger 19 to be preheated, and then enters the hot blast furnace 2 through the air pipeline 22 and the air valve 11.

[0109] By installing air heat exchanger 19 and gas heat exchanger 20, the waste heat from the flue gas generated by combustion in hot blast furnace 2 is fully recovered and utilized to preheat the combustion air and gas, respectively. This not only increases the temperature of the combustion air and gas, but also promotes the combustion process, improves the combustion efficiency of hot blast furnace 2, and ensures more complete fuel combustion. Furthermore, it achieves cascaded energy utilization, reduces energy waste, improves the energy efficiency of the entire hot blast furnace system 100, reduces energy consumption and operating costs during the production process, and also reduces the additional environmental pollution caused by energy waste, resulting in significant economic and environmental benefits.

[0110] See also Figure 1 and Figure 2 According to some embodiments of the present application, the air pipeline 22 may include: an air main pipe 22a, multiple air branches 22b, a first air supply branch pipe 22c, and a second air supply branch pipe 22d. The exhaust air pipeline 25 is connected to the air main pipe 22a. The multiple air branches 22b correspond one-to-one to the air valves 11 of the multiple hot air furnaces 2 and are connected between the air valves 11 and the air main pipe 22a; the first air supply branch pipe 22c and the second air supply branch pipe 22d are connected in parallel between the fan 21 and the air main pipe 22a, and the heat exchange flow channel of the air heat exchanger 19 is connected in series to one of the first air supply branch pipe 22c and the second air supply branch pipe 22d. The first air supply valve 22e is provided on the first air supply branch pipe 22c, and the second air supply valve 22f is provided on the second air supply branch pipe 22d. The first air supply valve 22e and the second air supply valve 22f are both electrically connected to the control device.

[0111] The main air pipe 22a, the backbone of the air piping 22, serves as a key channel connecting the various branches and is used to collect and distribute air. Its diameter is typically large to meet the air flow requirements of multiple hot blast furnaces 2. It is typically made of corrosion-resistant, pressure-resistant metal materials, such as carbon steel or stainless steel. The exhaust air pipe 25 is connected to the main air pipe 22a, allowing exhaust air from the hot blast furnaces 2 to flow smoothly into the air piping system 22, thereby recovering the heat energy from the exhaust air.

[0112] The number of air branch pipes 22b corresponds to the number of hot blast stoves 2. For example, if there are four hot blast stoves 2, four air branch pipes 22b are provided. Each air branch pipe 22b is connected to the air main pipe 22a at one end and to the air valve 11 of the corresponding hot blast stove 2 at the other end. The pipe diameter is designed according to the air volume required by the corresponding hot blast stove 2. The function of the air branch pipe 22b is to transport air from the air main pipe 22a to each hot blast stove 2, providing combustion-supporting air for combustion in the hot blast stove 2.

[0113] The first and second air supply branches 22c and 22d are connected in parallel between the fan 21 and the air main 22a, forming two air transport paths from the fan 21 to the air main 22a. The heat exchange flow path of the air heat exchanger 19 is connected in series to one of the branches, and then to the first air supply branch 22c. The first air supply valve 22e, located on the first air supply branch 22c, and the second air supply valve 22f, located on the second air supply branch 22d, are both electric or pneumatic valves, which are easily controlled remotely. They are connected to a control device via electrical wiring or air circuits, and can receive commands from the control device to open and close the valves.

[0114] In some examples, taking the heat exchange flow channel of the air heat exchanger 19 connected in series on the first air supply branch 22c as an example, two first air supply valves 22e can be provided on the first air supply branch 22c, and the two first air supply valves 22e are distributed on both sides of the heat exchange flow channel to completely cut off the first air supply branch 22c passing through the heat exchange flow channel.

[0115] The fan 21 serves as a power source for air transportation, provides power for the flow of air in the pipeline, and pressurizes the air and sends it into the air main pipe 22a. Common types include centrifugal fans 21, axial flow fans 21, etc.

[0116] Under normal operating conditions, assuming the air heat exchanger 19 is connected in series to the first air supply branch pipe 22c and is operating normally, the control device controls the first air supply valve 22e to open and the second air supply valve 22f to close. The air output by the fan 21 passes through the first air supply branch pipe 22c, is preheated by the waste heat of the flue gas as it passes through the heat exchange flow path of the air heat exchanger 19, then enters the air main pipe 22a, and is subsequently transported to each hot blast furnace 2 through the air branch pipe 22b. If the air heat exchanger 19 fails, the control device controls the first air supply valve 22e to close and the second air supply valve 22f to open. The air output by the fan 21 enters the air main pipe 22a directly through the second air supply branch pipe 22d, bypassing the failed air heat exchanger 19 and continuing to provide combustion-supporting air to each hot blast furnace 2, ensuring the continuous operation of the hot blast furnace system 100.

[0117] By providing a first air supply branch pipe 22c and a second air supply branch pipe 22d in parallel, connecting an air heat exchanger 19 in series with one of the branches, and configuring a first air supply valve 22e and a second air supply valve 22f electrically connected to the control device, redundant air supply is provided for the hot blast furnace system 100. In the event of a failure in the air heat exchanger 19, the air delivery path can be quickly switched, preventing the hot blast furnace system 100 from suffering a reduction in combustion efficiency or even shutdown due to a lack of preheated air caused by a failure in the air heat exchanger 19. This improves the operational stability and reliability of the entire hot blast furnace system 100, reduces production interruptions and economic losses caused by equipment failures, and ensures the continuity of smelting production in the blast furnace 1.

[0118] In some embodiments, the first air supply branch pipe 22c or the second air supply branch pipe 22d may be connected to an air release pipeline, and the air release pipeline may be connected to an air release valve 22g, and the air release valve 22g is electrically connected to the control device.

[0119] By installing a pressure sensor (such as a piezoresistive pressure sensor or a capacitive pressure sensor) on fan 21, the air supply pressure of fan 21 is monitored in real time. The pressure sensor converts the monitored pressure signal into an electrical signal and transmits it to the control device. When the air supply pressure exceeds a threshold, the air relief valve 22g is controlled to open. For example, the air supply pressure of fan 21 is optimally between 12 and 13 kPa. When the air supply pressure of fan 21 reaches 14 kPa, the air relief valve 22g is controlled to open.

[0120] The control device precisely controls the pressure according to the actual situation, effectively preventing damage to the air piping system 22 and related equipment (such as the air valve 11 and air heat exchanger 19) caused by excessive air pressure from the fan 21, thereby ensuring the safe and stable operation of the air piping system 22. Furthermore, maintaining a stable air pressure helps improve the stability of the hot blast furnace 2 combustion process, ensuring that the hot blast furnace 2 can continuously and efficiently provide hot air to the blast furnace 1, reducing equipment failures and production fluctuations caused by abnormal pressure, and reducing equipment maintenance costs and economic losses caused by production interruptions.

[0121] In some embodiments, when the exhaust air valve 13 discharge pipe is directly connected to the air pipe 22, the pressure of the hot air furnace 2 after discharge and before combustion will be 12kPa. In order to ensure that the smoke valve 15 can be opened smoothly, the smoke valve 15 can be designed as a butterfly valve structure.

[0122] See also Figure 1 and Figure 2According to some embodiments of the present application, the smoke outlet includes a first smoke outlet and a second smoke outlet, the smoke valve 15 includes a first smoke valve 15a provided at the first smoke outlet and a second smoke valve 15b provided at the second smoke outlet, and the second smoke outlet is further provided with a smoke valve 16 connected in parallel with the second smoke valve 15b.

[0123] The first and second flue gas outlets are two channels for exhausting the flue gas generated by combustion within the hot blast furnace 2. Providing two flue gas outlets increases the flexibility and reliability of flue gas exhaust. A first flue gas valve 15a is installed at the first flue gas outlet, while a second flue gas valve 15b and a smoke extraction valve 16 are installed in parallel at the second flue gas outlet. The valves are opened and closed by commands from the control device, thereby controlling flue gas emissions.

[0124] The smoke sampling valve 16 is installed in parallel with the second smoke valve 15b at the second smoke outlet. It also uses a valve type suitable for high-temperature environments, such as an electric shut-off valve. Its primary function is to provide a channel for smoke sampling and monitoring operations during the combustion mode of the hot blast furnace 2, facilitating the detection of parameters such as the smoke composition and temperature generated by combustion.

[0125] The first flue gas valve 15a, the second flue gas valve 15b and the smoke extraction valve 16 are all electrically connected to the control device. The control device is configured to control the first flue gas valve 15a, the second flue gas valve 15b and the smoke extraction valve 16 to be closed when the hot blast stove 2 is in the air supply mode; and to control the first flue gas valve 15a, the second flue gas valve 15b and the smoke extraction valve 16 to be open when the hot blast stove 2 is in the combustion mode.

[0126] When the hot blast furnace 2 is in air supply mode, the control device controls the first flue gas valve 15a, the second flue gas valve 15b, and the flue gas extraction valve 16 to be closed, preventing cold air from entering the hot blast furnace 2 and hot air from escaping, ensuring that the hot blast furnace 2 effectively transfers heat to the incoming cold air and transports it to the blast furnace 1. When the hot blast furnace 2 switches to combustion mode, the control device simultaneously controls the first flue gas valve 15a, the second flue gas valve 15b, and the flue gas extraction valve 16 to open. At this time, the flue gas generated by the combustion of coal gas and combustion air in the hot blast furnace 2 is partially discharged through the first flue gas outlet via the first flue gas valve 15a, and the remaining portion is discharged through the second flue gas outlet, either via the second flue gas valve 15b or the flue gas extraction valve 16. The flue gas discharged through the flue gas extraction valve 16 can be used by relevant detection equipment for flue gas composition analysis, temperature measurement, and other operations, thereby monitoring the combustion status of the hot blast furnace 2 in real time and providing a basis for adjusting combustion parameters.

[0127] In some embodiments, in order to avoid the problem that the high pressure (usually 400 kPa) of the hot blast furnace 2 cannot be relieved in the special situation where the waste air valve 13 fails and cannot be opened, the smoke valve 16 can be used to release the pressure in an emergency.

[0128] See also Figure 1 and Figure 2 According to some embodiments of the present application, the cold air inlet may also be provided with a cold air regulating valve 5 connected in series with the cold air valve 4, and a cold air equalizing pressure valve 6 connected in parallel with the cold air valve 4 and the cold air regulating valve 5; the cold air regulating valve 5 and the cold air equalizing pressure valve 6 are both electrically connected to the control device.

[0129] The cold air control valve 5 is installed in series with the cold air valve 4 at the cold air inlet. Common types include electric control valves and pneumatic control valves. Their structural characteristics vary the cross-sectional area of ​​the passageway by moving the internal valve core, thereby precisely regulating the flow of cold air entering the hot air furnace 2. For example, an electric control valve consists of an electric actuator and a control valve. The electric actuator drives the valve core according to signals from the control device to meet the cold air flow requirements under different operating conditions, effectively controlling the heating and air supply temperatures of the hot air furnace 2.

[0130] The cold air pressure equalizing valve 6 is connected in parallel with the cold air valve 4 and the cold air regulating valve 5. It also uses a valve type suitable for the working environment of the hot air stove 2, such as a butterfly valve or gate valve. Its function is to balance the pressure in the cold air duct and inside the hot air stove 2 when the hot air stove 2 switches between states, reduce the pressure difference when the cold air valve 4 is opened, and avoid damage to the cold air valve 4 due to pressure shock.

[0131] The control device establishes an electrical connection with the cold air regulating valve 5 and the cold air equalizing pressure valve 6 through electrical lines or wireless communication, can monitor and control the opening and closing status of the valves in real time, and receive feedback signals from the valves to ensure that the valves operate according to predetermined procedures.

[0132] Cold air flows in from the cold air inlet, passes through the cold air regulating valve 5 and the cold air valve 4 in sequence and enters the hot air furnace 2; one end of the cold air equalizing valve 6 is connected to the cold air inlet pipe before the cold air regulating valve 5, and the other end is connected to the pipe after the cold air valve 4 close to the hot air furnace 2, forming a loop structure in parallel with the cold air valve 4 and the cold air regulating valve 5.

[0133] The control device is configured to control the cold air equalizing pressure valve 6 and the cold air regulating valve 5 to be closed when the hot air stove 2 is in combustion mode; when the hot air stove 2 switches from combustion mode to air supply mode, before controlling the cold air valve 4 to be opened, the cold air equalizing pressure valve 6 is first controlled to be opened.

[0134] When the hot blast furnace 2 is in combustion mode, the control device controls the cold air equalizing pressure valve 6 and the cold air regulating valve 5 to be closed; when the hot blast furnace 2 is switched from combustion mode to air supply mode, directly opening the cold air valve 4 will cause the cold air valve 4 to be subjected to a large pressure difference. Therefore, the control device first controls the cold air equalizing pressure valve 6 to be opened, so that the cold air duct is connected to the inside of the hot blast furnace 2, and the cold air flows into the hot blast furnace 2 through the cold air equalizing pressure valve 6 to balance the pressure between the two. After the pressure is balanced, the control device controls the cold air valve 4 to be opened. At this time, the cold air valve 4 is opened under a smaller pressure difference, which reduces the damage to the valve caused by the pressure shock. Subsequently, the cold air regulating valve 5 adjusts the cold air flow according to the air supply demand. The cold air enters the hot blast furnace 2 and is heated, and then is transported to the blast furnace 1 through the hot air valve 3.

[0135] See also Figure 1 In some embodiments, four hot blast stoves 2 are provided, and the four hot blast stoves 2 adopt a "two burning and two sending" method, that is, two hot blast stoves 2a are in the combustion mode, and two hot blast stoves 2b are in the air supply mode. The air supply of the two hot blast stoves 2b needs to ensure that the air supply temperature is within a predetermined threshold range. When the air supply temperature is lower than the lower limit of the threshold range, one of the two hot blast stoves 2a in the combustion mode is controlled to switch to the air supply mode, and then one of the hot blast stoves 2b is controlled to switch from the air supply mode to the combustion mode; when the air supply temperature is lower than the lower limit of the threshold range again, the other hot blast stove 2a in the combustion mode is controlled to switch to the air supply mode, and then the other hot blast stove 2b is controlled to switch to the combustion mode, and this cycle is repeated.

[0136] See also Figure 1 and Figure 2 In some embodiments, the cold air valve 4 is connected to the cold air supply device 28 through a cold air pipeline 23. The cold air pipeline 23 includes a cold air main pipe 23a, an air mixing pipe 23c and multiple cold air branch pipes 23b. The multiple cold air branch pipes 23b correspond one-to-one to the multiple cold air valves 4. The cold air branch pipes 23b are connected between the cold air valve 4 and the cold air main pipe 23a. The air mixing pipe 23c is connected between the cold air main pipe 23a and the hot air pipe. A mixing valve 234 is provided on the mixing pipe 23c, and the mixing valve 234 is electrically connected to the control device.

[0137] The main air duct is the backbone of the cold air pipeline 23 and is the key channel connecting the cold air supply device 28 and each cold air branch pipe 23b. It is usually made of corrosion-resistant and pressure-resistant metal materials, such as carbon steel or stainless steel. Its pipe diameter is designed according to the total cold air flow required by the entire hot air furnace system 100. It is used to collect the cold air output from the cold air supply device 28 and distribute the cold air to each cold air branch pipe 23b.

[0138] The mixing duct 23c connects between the cold air main duct 23a and the hot air duct. It is also made of high-temperature and high-pressure resistant materials suitable for the operating environment of the hot air furnace 2. Its function is to mix the cold air from the cold air main duct 23a with the hot air from the hot air duct. By adjusting the amount of cold air mixed in, the output hot air temperature can be precisely controlled. For example, if the hot air temperature needs to be lowered, the amount of cold air mixed in the mixing duct 23c can be increased.

[0139] The number of cold air branch pipes 23b corresponds to the number of hot blast stoves 2. One end of each cold air branch pipe 23b is connected to the cold air main pipe 23a, and the other end is connected to the cold air valve 4 of the corresponding hot blast stove 2. The pipe diameter is designed according to the cold air demand of the corresponding hot blast stove 2. It is used to transport the cold air from the cold air main pipe 23a to each hot blast stove 2, providing the required cold air for the heating process of the hot blast stove 2.

[0140] The air mixing valve 234 is mounted on the air mixing duct 23c. It can be an electric or pneumatic control valve, electrically connected to the control device via electrical wiring or air circuitry. Its structural feature is its ability to precisely adjust the valve opening according to the control device's instructions, thereby controlling the flow of cold air in the air mixing duct 23c and regulating the temperature of the hot air.

[0141] The cold air supply device 28 can be an air compressor, a cooling unit or other equipment, which is responsible for providing the required low-temperature cold air for the hot air furnace system 100 and is a source device of cold air.

[0142] The cold air supply device 28 delivers cold air to the cold air main pipe 23a, which then distributes the cold air to the various cold air branches 23b, and then enters the hot blast furnace 2 through the cold air valve 4. When the hot air temperature needs to be adjusted, the control device controls the opening of the air mixing valve 234 and adjusts its opening according to the set temperature parameters or the actual detected hot air temperature data. At this time, some of the cold air in the cold air main pipe 23a will mix with the hot air in the hot air pipe through the air mixing pipe 23c. The wider the opening of the air mixing valve 234, the more cold air is mixed in, and the lower the temperature of the mixed hot air. Conversely, the smaller the opening of the air mixing valve 234, the less cold air is mixed in, and the higher the temperature of the mixed hot air. In this way, the temperature of the hot air output to the blast furnace 1 is precisely controlled to meet the different hot air temperature requirements of the smelting process in the blast furnace 1.

[0143] In some embodiments, when the hot blast furnace 2 is switched to air supply mode, the temperature of the heat storage element inside the hot blast furnace 2 is relatively high when the switch is first made. By appropriately increasing the cold air intake through the cold air regulating valve 5, the temperature inside the hot blast furnace 2 can be quickly lowered, bringing the output hot air temperature within a suitable range. In the initial air supply phase, if the cold air intake is not adjusted promptly, the hot air temperature may be too high, affecting the normal smelting of the blast furnace 1.

[0144] At the end of the air supply phase, the hot blast furnace 2 gradually cools as the heat from the heat storage element is released. At this point, the cold air intake is reduced via the cold air control valve 5 to prevent excessive cold air intake from causing the hot blast temperature to drop too low. This allows the hot blast furnace 2 to continue to output hot blast at a relatively stable temperature even at the end of the air supply phase, ensuring the continuity and stability of smelting in the blast furnace 1.

[0145] The function of the air mixing valve 234 is to mix the cold air in the cold air main pipe 23a with the hot air in the hot air pipe, thereby adjusting the temperature of the output hot air. However, during the use of the air mixing valve 234, there will be a certain amount of energy loss, because there will be heat exchange and pressure loss when the cold air and hot air are mixed. By accurately adjusting the cold air intake volume through the cold air regulating valve 5 to control the supply air temperature, the dependence on the air mixing valve 234 can be reduced. When the cold air regulating valve 5 can accurately adjust the cold air intake volume in the hot air furnace 2 so that the hot air temperature reaches the appropriate value, the opening degree and frequency of use of the air mixing valve 234 can be reduced. For example, under some working conditions, the hot air temperature can meet the requirements through the cold air regulating valve 5, and the air mixing valve 234 can even be completely closed, thereby reducing energy waste in the air mixing process and improving the energy utilization efficiency of the entire hot air furnace system 100.

[0146] The embodiment of the present application also provides a control method for the hot blast stove system 100 .

[0147] The hot blast stove system 100 is a hot blast stove system 100 according to any of the above technical solutions, and therefore has the technical features and technical effects of the hot blast stove system 100 according to any of the above technical solutions, which will not be described in detail here.

[0148] The control method of the hot blast stove system 100, the control device of the hot blast stove system 100, the electronic device 500 and the readable storage medium provided in the embodiments of the present application are described in detail below with reference to specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0149] The control method of the hot blast stove system 100 may be applied to a terminal, and may be specifically executed by hardware or software in the terminal.

[0150] The terminal includes, but is not limited to, a portable communication device such as a mobile phone or tablet computer having a touch-sensitive surface (e.g., a touch screen display and / or a touch pad). It should also be understood that, in some embodiments, the terminal may not be a portable communication device, but a desktop computer having a touch-sensitive surface (e.g., a touch screen display and / or a touch pad).

[0151] In the following embodiments, a terminal including a display and a touch-sensitive surface is described. However, it should be understood that the terminal may include one or more other physical user interface devices such as a physical keyboard, a mouse, and a joystick.

[0152] The control method of the hot blast furnace system 100 provided in the embodiment of the present application, the execution subject of the control method of the hot blast furnace system 100 can be an electronic device 500 or a functional module or functional entity in the electronic device 500 that can implement the control method of the hot blast furnace system 100. The electronic device 500 mentioned in the embodiment of the present application includes but is not limited to industrial computers, mobile phones, tablet computers, computers, cameras and wearable devices, etc. The control method of the hot blast furnace system 100 provided in the embodiment of the present application is described below using the electronic device 500 as an execution subject as an example.

[0153] The air inlet is further provided with an air regulating valve 12 connected in series with the air valve 11, and the gas inlet is further provided with a gas shut-off valve 9. The gas shut-off valve 9 and the gas valve 7 are connected in series in a direction close to the gas inlet. A gas release pipeline is connected between the gas shut-off valve 9 and the gas valve 7, and a gas release valve 10 is provided on the gas release pipeline. The hot blast furnace 2 is provided with a first pressure sensor, and the air pipeline 22 is provided with a second pressure sensor. Both the first pressure sensor and the second pressure sensor are electrically connected to the control device.

[0154] See also Figure 3 When the hot blast stove 2 is switched from the air supply mode to the combustion mode, the control method includes: step 210, step 220, step 230, step 240, step 250, step 260, step 270 and step 280.

[0155] Step 210: Control the cold air valve 4 and the hot air valve 3 to close.

[0156] In step 210, the control device first issues a command to close the cold air valve 4 and the hot air valve 3, cutting off the channel for cold air to enter the hot air furnace 2 and the channel for hot air to be output, ensuring that the hot air furnace 2 is isolated from the cold air supply system and the hot air use system, and preparing for switching to the combustion mode.

[0157] Step 220 , control the exhaust air valve 13 to open, and obtain a first pressure value in the hot air stove 2 and a second pressure value in the air pipeline 22 .

[0158] In step 220, the waste air valve 13 is opened to discharge part of the gas in the hot blast furnace 2 into the air pipe 22 through the waste air pipe 25. At the same time, the first pressure value in the hot blast furnace 2 and the second pressure value in the air pipe 22 are respectively obtained in real time by using the first pressure sensor and the second pressure sensor, and these data are transmitted to the control device.

[0159] Step 230: When the first pressure value is equal to the second pressure value, control the air valve 11 and the flue valve to open.

[0160] In step 230, the control device continuously compares the first pressure value and the second pressure value. When the two are equal, it indicates that the pressure between the hot blast furnace 2 and the air pipe 22 has reached equilibrium. At this time, the control device issues a command to open the air valve 11 and the flue valve to introduce combustion air into the hot blast furnace 2 and allow the smoke generated by combustion to be discharged through the flue.

[0161] Step 240: Control the exhaust air valve 13 to close.

[0162] In step 240, after the air valve 11 and the flue valve are opened, the waste air valve 13 is closed to stop the discharge of gas in the hot blast stove 2 to the air pipe 22, so that the gas flow path of the hot blast stove 2 is completely switched to the combustion mode.

[0163] Step 250: Control the gas valve 7 to open, and control the gas release valve 10 to close.

[0164] In step 25, the gas valve 7 is opened to allow the gas to start flowing into the hot blast furnace 2, and the gas release valve 10 is closed at the same time to prevent the gas from leaking through the release pipeline, ensuring that all the gas can enter the hot blast furnace 2 to participate in combustion.

[0165] Step 260 : Control the air regulating valve 12 to open to a preset opening.

[0166] In step 260, the air regulating valve 12 is controlled to open to a preset opening, which is pre-set based on the combustion requirements of the hot blast stove 2 and parameters such as the gas flow rate to ensure that the amount of air entering the hot blast stove 2 can meet the requirements of gas ignition. In some examples, the air regulating valve 12 can be opened to an opening of 5%.

[0167] Step 270: Control the gas shut-off valve 9 to open.

[0168] Step 280: Control the gas valve 7 to open to a preset opening.

[0169] In steps 270 and 280, gas shutoff valve 9 and gas valve 7 are opened. Gas can now enter the hot blast furnace 2 through these valves and mix with the combustion-supporting air already introduced. Gas valve 7 is controlled to open to a preset opening, precisely controlling the gas flow entering the hot blast furnace 2 so that the gas and air mix in a specific ratio to meet the ignition requirements of the hot blast furnace 2. In some examples, gas valve 7 can be opened to 5%.

[0170] After step 280, the control device can control the ignition, and after ignition, gradually and stably adjust the gas regulating valve 8 and the air regulating valve 12 to adjust the ratio of gas and air to ensure the optimal combustion amount required by the supply air temperature.

[0171] According to the control method provided in the embodiment of the present application, through a reasonable valve control sequence and pressure balance adjustment, the hot blast furnace 2 is switched safely, stably and efficiently from the air supply mode to the combustion mode, thereby improving the overall performance and operational safety of the hot blast furnace system 100, significantly reducing the damage probability of the air valve 11, extending the service life of the air valve 11, and reducing equipment maintenance costs; at the same time, the heat energy of the waste air is recovered and utilized and added to the air pipeline 22 to increase the temperature of the combustion air, which helps to improve the combustion efficiency and realize the reasonable recovery and reuse of energy, thereby improving the energy utilization efficiency, meeting the industrial production needs of energy conservation and emission reduction, and having high economic value and environmental protection significance.

[0172] According to some embodiments of the present application, a second temperature detector 18 is provided at the gas outlet, and the second temperature detector 18 is electrically connected to the control device.

[0173] A second temperature detector 18 is installed at the gas outlet to monitor the flue gas temperature generated by the hot blast furnace 2 in real time. Common temperature detectors include thermocouples and RTDs, which convert temperature signals into electrical signals and transmit them to the control device. The control device receives the flue gas temperature data from the second temperature detector 18, performs logical analysis based on preset temperature thresholds, and issues corresponding control instructions to control the opening and closing status of the gas regulating valve 8, gas shutoff valve 9, and gas release valve 10.

[0174] After the hot blast stove 2 is switched to the combustion mode, the control method further includes: step 310 , step 320 and step 330 .

[0175] Step 310: Obtain the flue gas temperature of the hot blast stove 2.

[0176] In step 310, after the hot blast stove 2 switches to the combustion mode, the second temperature detector 18 continuously monitors the flue gas temperature in real time and transmits the temperature data to the control device. The control device processes and analyzes the received temperature data to timely monitor the combustion status in the hot blast stove 2.

[0177] Step 320: When the flue gas temperature reaches a first preset temperature threshold, the gas regulating valve 8 and the gas shut-off valve 9 are controlled to close in sequence.

[0178] In step 320, the control device compares the real-time flue gas temperature with a first preset temperature threshold. When the flue gas temperature reaches the first preset temperature threshold, it indicates that the combustion process in the hot blast furnace 2 may have reached or is approaching its limit, and continued combustion may cause equipment damage or energy waste. At this point, the control device sequentially issues commands to close the gas regulating valve 8 and the gas shut-off valve 9. Closing the gas regulating valve 8 first gradually reduces the gas flow, avoiding a sudden gas shut-off that could cause unstable combustion or deflagration. Closing the gas shut-off valve 9 then completely cuts off the gas supply, ensuring that the combustion process ceases.

[0179] Step 330: Control the gas release valve 10 to open.

[0180] In step 330, after closing gas regulating valve 8 and gas shutoff valve 9, the control device immediately controls gas release valve 10 to open. After gas release valve 10 opens, the remaining gas in gas pipeline 26 is discharged through the release pipeline to a safe area, preventing the accumulation of residual gas in the pipeline and forming a flammable mixture, thereby eliminating safety hazards.

[0181] The setting of the first preset temperature threshold is usually based on factors such as the design parameters of the hot blast stove 2, the temperature tolerance of the refractory material, and the combustion efficiency. If the flue gas temperature is too high, it may cause damage to the lining, pipes and other components of the hot blast stove 2, shortening the service life of the equipment; at the same time, too high a temperature also means a waste of energy, reducing the energy utilization efficiency of the hot blast stove 2. Therefore, the temperature threshold needs to be determined under the premise of ensuring the normal operation and efficient combustion of the hot blast stove 2, taking into account factors such as equipment safety and energy conservation. In some examples, the value range of the first preset temperature threshold can be 350℃-390℃. For example, the first preset temperature threshold can be 350℃, 370℃, 380℃, 390℃ or other temperatures between 350℃-390℃.

[0182] According to some embodiments of the present application, when the hot blast stove 2 switches from the combustion mode to the air supply mode, the control method includes: step 410 , step 420 , step 430 , step 440 , step 450 , step 460 , step 470 and step 480 .

[0183] Step 410: Control the gas regulating valve 8 to close.

[0184] In step 410, the gas regulating valve 8 is first closed to gradually reduce the gas flow rate to avoid sudden shutoff that may cause unstable combustion.

[0185] Step 420: Control the gas shut-off valve 9 to close.

[0186] In step 420, the gas shut-off valve 9 is closed to completely cut off the gas supply and ensure that the combustion process stops.

[0187] Step 430: Control the gas release valve 10 to open, and record the first duration.

[0188] In step 430, the gas release valve 10 is opened, using the air in the air line 22 to discharge the remaining gas in the hot blast furnace 2 and gas line 26 through the release line to a safe area, preventing the accumulation of residual gas and forming a flammable mixture. Simultaneously, a first duration is recorded, which is used to control the release time.

[0189] Step 440: When the first time duration reaches the first time threshold, control the air regulating valve 12 to close, and record the second time duration;

[0190] In step 440, when the first time duration reaches the first time threshold, it indicates that the residual gas has been substantially exhausted. At this point, the air control valve 12 is closed, the supply of combustion air to the hot blast stove 2 is stopped, and the second time duration is recorded to control the time interval of subsequent operations. The first time threshold can be adjusted based on the actual situation of each hot blast stove 2. In some examples, the first time threshold can be 30 seconds to 50 seconds. For example, the first time threshold can be 30 seconds, 40 seconds, 50 seconds, or another time between 30 seconds and 50 seconds.

[0191] Step 450: When the second time period reaches a second time threshold, control the gas valve 7 to close.

[0192] In step 450, the second time threshold is a preset delay time. After the air control valve 12 is closed, the gas valve 7 is closed after a delay of the second time threshold to ensure that the gas in the hot blast stove 2 is fully released and the pressure in the hot blast stove 2 is released. In some examples, the second time threshold can be 3 seconds to 5 seconds. For example, the second time threshold can be 3 seconds, 4 seconds, 5 seconds, or other time between 3 seconds and 5 seconds.

[0193] Step 460: Control the air valve 11 to close.

[0194] Step 470: Control the smoke valve 15 to close.

[0195] In step 460-step 470, the air valve 11 and the smoke valve 15 are closed in sequence to cut off the flow paths of air and smoke, thereby isolating the hot blast furnace 2 from the air supply system and the smoke exhaust system, in preparation for switching to the air supply mode.

[0196] Step 480: Control the cold air valve 4 and the hot air valve 3 to open.

[0197] In step 480, after completing the above series of closing operations, the cold air valve 4 and the hot air valve 3 are opened. The cold air enters the hot blast furnace 2 through the cold air valve 4, is heated, and then is delivered to the blast furnace 1 through the hot air valve 3, causing the hot blast furnace 2 to enter the air supply mode and provide high-temperature hot air to the blast furnace 1.

[0198] Strict valve closing and venting procedures ensure gas system safety, preventing gas leaks and explosions. Reasonable time threshold settings ensure sufficient discharge of residual gas and safe cooling of the equipment. Sequential valve operation and time control ensure a smooth transition from combustion mode to air supply mode in hot blast furnace 2, preventing the impact of pressure fluctuations and temperature changes on the equipment and reducing the risk of equipment damage. The entire switching process is automatically executed by the control device according to preset logic and time thresholds, reducing manual intervention, improving the accuracy and reliability of the switching process, and reducing operator workload and operational risks.

[0199] In some embodiments, step 480 , the step of controlling the cold air valve 4 and the hot air valve 3 to open, further includes: step 481 and step 482 .

[0200] Step 481: Control the cold air pressure equalizing valve 6 to open.

[0201] In step 481, the cold air pressure equalizing valve 6 is connected between the cold air main pipe 23a and the hot air furnace 2. Once opened, it quickly equalizes the pressure between the two. This prevents airflow shock caused by a large pressure difference when the cold air valve 4 is opened, protects the valve seal, and extends its service life. Furthermore, pre-charging the cold air preheats the pipe, reducing temperature fluctuations.

[0202] Step 482: Control the cold air valve 4 and the hot air valve 3 to open.

[0203] In step 482 , after the pressure is balanced, the main valve is opened, the cold air valve 4 is opened to allow the cold air to enter the heat storage chamber, and the hot air valve 3 is opened synchronously to allow the hot air to be transported to the blast furnace 1 .

[0204] Step 483: Control the cold air pressure equalizing valve 6 to close.

[0205] In step 483, after the main valve is fully opened and the system is stable, the pressure equalizing valve is closed to allow the cold air to enter completely through the cold air regulating valve 5. The short-term use of the pressure equalizing valve reduces the load on the main valve and reduces throttling losses.

[0206] Step 484: Obtain the hot air temperature and control the opening of the cold air regulating valve 5 according to the hot air temperature.

[0207] In step 484, temperature data can be collected in real time using a temperature sensor installed on the hot air pipe 24. The control device dynamically adjusts the opening of the cold air control valve 5 based on the deviation between the preset temperature and the actual temperature. The system can also automatically adjust PID parameters to respond to changes in the operating conditions of blast furnace 1. For example, if the oxygen enrichment rate of blast furnace 1 changes, the temperature setpoint can be corrected using the correlation model.

[0208] This control strategy solves the problems of large temperature fluctuations and severe equipment loss in the traditional switching process through pressure balance, sequential control and intelligent adjustment, and significantly improves the reliability and economy of the hot blast furnace system 100.

[0209] In some embodiments, the hot blast stove 2 is further provided with an isolation mode, wherein the isolation mode means stopping the combustion of the hot blast stove 2 or stopping the air supply of the hot blast stove 2. The isolation mode can create conditions for unified operation and automation.

[0210] When the hot blast stove 2 is switched from the combustion mode to the isolation mode, the control device may execute steps 410 to 460 .

[0211] When the hot blast stove 2 is switched from the air supply mode to the isolation mode, the control device may execute steps 210 to 240 .

[0212] When the hot blast stove 2 is switched from the isolation mode to the combustion mode, the control device may execute steps 250 to 280 .

[0213] When the hot blast stove 2 is switched from the isolation mode to the air supply mode, the control device may execute steps 470 to 480 .

[0214] The control method of the hot blast stove system 100 provided in the embodiment of the present application can be executed by the control device of the hot blast stove system 100. In the embodiment of the present application, the control device of the hot blast stove system 100 executing the control method of the hot blast stove system 100 is used as an example to illustrate the control device of the hot blast stove system 100 provided in the embodiment of the present application.

[0215] The embodiment of the present application also provides a control device for the hot blast stove system 100 .

[0216] like Figure 4 As shown, the control device of the hot blast stove system 100 includes: a first control module 31 , a second control module 32 , a third control module 33 , a fourth control module 34 , a fifth control module 35 , a sixth control module 36 , a seventh control module 37 , and an eighth control module 38 .

[0217] The first control module 31 is used to control the cold air valve 4 and the hot air valve 3 to close;

[0218] The second control module 32 is used to control the exhaust air valve 13 to open, and obtain a first pressure value in the hot air furnace 2 and a second pressure value in the air pipeline 22;

[0219] The third control module 33 is used to control the air valve 11 and the flue valve to open when the first pressure value is equal to the second pressure value;

[0220] The fourth control module 34 is used to control the exhaust air valve 13 to close;

[0221] The fifth control module 35 is used to control the gas valve 7 to open and the gas release valve 10 to close;

[0222] A sixth control module 36 is used to control the air regulating valve 12 to open to a preset opening;

[0223] The seventh control module 37 is used to control the gas shut-off valve 9 to open;

[0224] The eighth control module 38 is used to control the gas valve 7 to open to a preset opening degree.

[0225] According to the control device of the hot blast furnace system 100 of the present application, through a reasonable valve control sequence and pressure balance adjustment, the hot blast furnace 2 is switched from the air supply mode to the combustion mode in a safe, stable and efficient manner, thereby improving the overall performance and operational safety of the hot blast furnace system 100, significantly reducing the damage probability of the air valve 11, extending the service life of the air valve 11, and reducing equipment maintenance costs; at the same time, the heat energy of the waste air is recovered and utilized, and added to the air pipeline 22 to increase the temperature of the combustion air, which helps to improve the combustion efficiency and realize the reasonable recovery and reuse of energy, thereby improving the energy utilization efficiency, meeting the industrial production needs of energy conservation and emission reduction, and having high economic value and environmental protection significance.

[0226] In some embodiments, the control device may further include: a ninth control module, a tenth control module, and an eleventh control module.

[0227] A ninth control module, configured to obtain the flue gas temperature of the hot blast stove 2;

[0228] a tenth control module, configured to sequentially control the gas regulating valve 8 and the gas shut-off valve 9 to close when the flue gas temperature reaches a first preset temperature threshold;

[0229] The eleventh control module is used to control the gas release valve 10 to open.

[0230] In some embodiments, the control device may further include: a twelfth control module, a thirteenth control module, a fourteenth control module, a fifteenth control module, a sixteenth control module, a seventeenth control module, an eighteenth control module, and a nineteenth control module.

[0231] A twelfth control module, used for controlling the gas regulating valve 8 to close;

[0232] A thirteenth control module, used for controlling the gas shut-off valve 9 to close;

[0233] A fourteenth control module, configured to control the gas release valve 10 to open and record the first duration;

[0234] A fifteenth control module is configured to control the air regulating valve 12 to close when the first time duration reaches a first time threshold, and record a second time duration;

[0235] A sixteenth control module is configured to control the gas valve 7 to close when the second time period reaches a second time threshold;

[0236] A seventeenth control module, used for controlling the air valve 11 to close;

[0237] An eighteenth control module, used to control the smoke valve 15 to close;

[0238] The nineteenth control module is used to control the opening of the cold air valve 4 and the hot air valve 3.

[0239] In the embodiment of the present application, the control device of the hot blast furnace system 100 can be an electronic device 500, or a component of the electronic device 500, such as an integrated circuit or chip. The electronic device 500 can be a terminal or other devices other than a terminal. For example, the electronic device 500 can be an industrial computer, a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device 500, a mobile Internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA). It can also be a server, a network attached storage 502 (NAS), a personal computer (PC), a television (TV), a teller machine (ATM), or a self-service machine, etc., and the embodiment of the present application does not specifically limit this.

[0240] The control device of the hot blast stove system 100 in the embodiment of the present application may be a device having an operating system. The operating system may be a Linux system, a VxWorks system, a QNX system, a Microsoft (Windows) operating system, an Android operating system, an iOS operating system, or other possible operating systems, which are not specifically limited in the embodiment of the present application.

[0241] The control device of the hot blast stove system 100 provided in the embodiment of the present application can realize Figure 3 To avoid repetition, the various processes implemented in the method embodiment are not described here.

[0242] In some embodiments, as Figure 5 As shown, an embodiment of the present application also provides an electronic device 500, including a processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. When the program is executed by the processor 501, each process of the control method embodiment of the above-mentioned silo loading system is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0243] It should be noted that the electronic device 500 in the embodiment of the present application includes the above-mentioned mobile electronic device 500 and non-mobile electronic device 500.

[0244] The embodiment of the present application further provides a computer program product, including a computer program, which implements the control method of the hot blast stove system 100 when executed by the processor 501.

[0245] The processor 501 is the processor 501 in the electronic device 500 in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory 502ROM, a random access memory 502RAM, a magnetic disk, or an optical disk.

[0246] An embodiment of the present application further provides a chip, which includes a processor 501 and a communication interface. The communication interface and the processor 501 are coupled. The processor 501 is used to run programs or instructions to implement the various processes of the control method embodiment of the above-mentioned hot blast furnace system 100, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0247] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0248] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0249] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0250] In the description of this application, “plurality” means two or more.

[0251] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0252] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0253] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0254] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A hot blast stove system, characterized in that: include: blast furnace; Multiple hot blast furnaces, each of which is provided with a hot blast outlet, a cold blast inlet, a gas inlet, an air inlet, a waste blast outlet, and a flue gas outlet; the hot blast outlet is provided with a hot blast valve, which is connected to the blast furnace via a hot blast pipeline; the cold blast outlet is provided with a cold blast valve; the gas inlet is provided with a gas valve; the air inlet is provided with an air valve, which is connected to a blower via an air pipeline; the waste blast outlet is provided with a waste blast valve, which is connected to the air pipeline via a waste blast pipeline; and the flue gas outlet is provided with a flue gas valve; a control device, the control device being electrically connected to the hot air valve, the cold air valve, the gas valve, the air valve, the waste air valve and the flue gas valve; the hot blast stove having a combustion mode and an air supply mode; the control device being configured to, when the hot blast stove is in the combustion mode, control the hot air valve, the cold air valve and the waste air valve to be closed, and control the gas valve, the air valve and the flue gas valve to be open; when the hot blast stove is in the air supply mode, control the hot air valve and the cold air valve to be open, and control the waste air valve, the gas valve, the air valve and the flue gas valve to be closed; and when the hot blast stove is switched from the air supply mode to the combustion mode, after the cold air valve and the hot air valve are closed, first control the waste air valve to be opened, and then control the air valve to be opened.

2. The hot blast stove system according to claim 1, characterized in that: The air inlet is further provided with an air regulating valve connected in series with the air valve, the gas inlet is further provided with a gas regulating valve connected in series with the gas valve, the exhaust air outlet is further provided with an exhaust air regulating valve connected in series with the exhaust air valve, and a first temperature detector is provided on the top of the hot air furnace; The first temperature detector, the air control valve, the gas control valve and the exhaust air control valve are all electrically connected to the control device. Some of the multiple hot blast stoves are in air supply mode, and the rest are in combustion mode. When the exhaust air valve of a certain hot blast stove is open, the control device is configured to adjust the opening of the air control valve and the gas control valve corresponding to the hot blast stove in combustion mode, as well as the exhaust air control valve corresponding to the opened exhaust air valve, according to the top temperature value of the hot blast stove in combustion mode.

3. The hot blast stove system according to claim 2, characterized in that: The gas inlet is further provided with a gas shut-off valve. The gas shut-off valve, the gas regulating valve and the gas valve are sequentially connected in series in a direction close to the gas inlet. A gas release pipeline is connected between the gas regulating valve and the gas valve, and a gas release valve is provided on the gas release pipeline. The gas shut-off valve and the gas release valve are both electrically connected to the control device, and the control device is configured to control the gas release valve to close when the hot blast stove is in combustion mode; and to control the gas release valve to open when the hot blast stove is in air supply mode.

4. The hot blast stove system according to claim 1, characterized in that: The flue gas valve is connected to the flue gas treatment equipment through a flue gas pipeline, and the gas valve is connected to the gas supply equipment through a gas pipeline. The hot blast furnace system also includes: An air heat exchanger, wherein the medium flow channel of the air heat exchanger is connected in series to the flue gas pipeline, and the heat exchange flow channel of the air heat exchanger is connected in series to the air pipeline; A gas heat exchanger, wherein the medium flow channel of the gas heat exchanger is connected in series to the flue gas pipeline, and the heat exchange flow channel of the gas heat exchanger is connected in series to the gas pipeline.

5. The hot blast stove system according to claim 4, characterized in that: The air pipeline comprises: an air main pipe, the exhaust air pipeline being connected to the air main pipe; a plurality of air branch pipes, corresponding one to one with the air valves of the plurality of hot blast stoves, and connected between the air valves and the air main pipe; The first air supply branch and the second air supply branch are connected in parallel between the fan and the air main, and the heat exchange channel of the air heat exchanger is connected in series to one of the first air supply branch and the second air supply branch. The first air supply branch is provided with a first air supply valve, and the second air supply branch is provided with a second air supply valve. The first air supply valve and the second air supply valve are both electrically connected to the control device.

6. The hot blast stove system according to any one of claims 1 to 5, characterized in that: The smoke outlet includes a first smoke outlet and a second smoke outlet, the smoke valve includes a first smoke valve provided at the first smoke outlet and a second smoke valve provided at the second smoke outlet, and the second smoke outlet is further provided with a smoke collection valve connected in parallel with the second smoke valve; The first flue gas valve, the second flue gas valve and the flue gas extraction valve are all electrically connected to the control device, and the control device is configured to control the first flue gas valve, the second flue gas valve and the flue gas extraction valve to be closed when the hot blast stove is in the air supply mode; and to control the first flue gas valve, the second flue gas valve and the flue gas extraction valve to be open when the hot blast stove is in the combustion mode.

7. The hot blast stove system according to any one of claims 1 to 5, characterized in that: The cold air inlet is further provided with a cold air regulating valve connected in series with the cold air valve, and a cold air pressure equalizing valve connected in parallel with the cold air valve and the cold air regulating valve; The cold air regulating valve and the cold air equalizing pressure valve are both electrically connected to the control device, and the control device is configured to control the cold air equalizing pressure valve and the cold air regulating valve to close when the hot air stove is in combustion mode; when the hot air stove switches from combustion mode to air supply mode, the cold air equalizing pressure valve is controlled to open before controlling the cold air valve to open.

8. A control method for a hot blast stove system according to any one of claims 1 to 7, characterized in that: The air inlet is further provided with an air regulating valve connected in series with the air valve, and the gas inlet is further provided with a gas shut-off valve. The gas shut-off valve and the gas valve are sequentially connected in series in a direction close to the gas inlet. A gas release pipeline is connected between the gas shut-off valve and the gas valve, and the gas release pipeline is provided with a gas release valve. The hot blast furnace is provided with a first pressure sensor, and the air pipeline is provided with a second pressure sensor. Both the first pressure sensor and the second pressure sensor are electrically connected to the control device. When the hot blast furnace is switched from the air supply mode to the combustion mode, the control method includes: Controlling the cold air valve and the hot air valve to close; controlling the exhaust air valve to open, and obtaining a first pressure value in the hot air furnace and a second pressure value in the air pipeline; When the first pressure value is equal to the second pressure value, controlling the air valve and the flue valve to open; controlling the exhaust air valve to close; Controlling the gas valve to open and controlling the gas release valve to close; Controlling the air regulating valve to open to a preset opening; Controlling the gas shut-off valve to open; The gas valve is controlled to open to a preset opening.

9. The control method of the hot blast stove system according to claim 8, characterized in that: A second temperature detector is provided at the gas port, and the second temperature detector is electrically connected to the control device. After the hot air stove is switched to the combustion mode, the control method further includes: Obtaining the flue gas temperature of the hot blast stove; When the flue gas temperature reaches a first preset temperature threshold, sequentially controlling the gas regulating valve and the gas shut-off valve to close; Control the gas release valve to open.

10. The control method of the hot blast stove system according to claim 8, characterized in that: When the hot blast furnace is switched from combustion mode to air supply mode, the control method includes: Controlling the gas regulating valve to close; Controlling the gas shut-off valve to close; controlling the gas release valve to open and recording a first duration; When the first time duration reaches a first time threshold, controlling the air control valve to close and recording a second time duration; When the second time period reaches a second time threshold, controlling the gas valve to close; Controlling the air valve to close; Controlling the smoke valve to close; Control the cold air valve and the hot air valve to open.

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