Hot blast stove system

Abstract

The utility model relates to a hot-blast stove system. The hot-blast stove system comprises a hot-blast stove used for generating hot air used for providing heat for heat treatment materials; comprising an exhaust pipeline of exhaust equipment, an air outlet communicated to the hot-blast stove and an external space; comprising an air return pipeline of air return equipment, communicates with the exhaust pipeline and a first air inlet of the hot-blast stove, and is used for returning tail gas of the hot-blast stove to the hot-blast stove and keeping pressure in the hot-blast stove as negative pressure relative to external air pressure; and the fresh air pipeline communicates with the air return pipeline and the second air inlet of the hot blast stove and is used for cooling the furnace end and / or the furnace wall of the hot blast stove. According to the hot-blast stove system, tail gas with the high temperature can be guided into the fresh air pipeline to cool the hot-blast stove, efficient gas recycling is achieved, and energy consumption can be reduced.

Description

Technical Field

[0001] The present disclosure relates to thermal energy devices, and more particularly, to hot blast stove systems. Background Art

[0002] With the development of society, hot blast furnaces are widely used in various fields. For example, in industrial production, existing hot blast furnaces directly feed exhaust gas as return air into the furnace body. Return air equipment (e.g., a return air blower) is used to control the pressure within the furnace body. Fresh air equipment (e.g., a fresh air blower) is then used to introduce cooling gas to cool at least one part of the hot blast furnace (e.g., the furnace head, furnace wall, etc.). However, introducing a large amount of cooling gas for cooling increases the energy consumption of the hot blast furnace. Utility Model Content

[0003] The utility model provides a hot blast stove system to at least partially solve the problems in the prior art.

[0004] One aspect of the present invention provides a hot blast stove system, comprising: a hot blast stove having a plurality of air inlets and air outlets, the hot blast stove being used to generate hot blast, and the hot blast being used to provide heat for heat-treated materials; an exhaust duct being connected to the air outlet of the hot blast stove and an external space, the exhaust duct comprising an exhaust device; a return air duct being connected to the exhaust duct and a first air inlet among the plurality of air inlets of the hot blast stove, for returning the exhaust gas of the hot blast stove to the hot blast stove and maintaining the pressure in the hot blast stove at a negative pressure relative to the external air pressure, the return air duct comprising a return air device; a fresh air duct being connected to a second air inlet among the plurality of air inlets of the hot blast stove, for cooling the furnace head and / or furnace wall of the hot blast stove.

[0005] In some examples, the return air duct is connected to the fresh air duct via a flow guide mechanism.

[0006] In some examples, a control valve is provided between the return air duct and the fresh air duct for controlling the flow rate of gas transmitted from the return air duct to the fresh air duct.

[0007] In some examples, the guide mechanism is arranged in the return air duct and divides the channel of the return air duct into multiple sub-channels, wherein the first air inlet of the hot air furnace is connected to the first sub-channel of the multiple sub-channels, and the fresh air duct is connected to the second sub-channel of the multiple sub-channels.

[0008] In some examples, the guide mechanism includes a first guide plate, which is arranged at a first angle relative to the return air duct to deflect the gas flow direction in the second sub-channel from a first direction to a second direction.

[0009] In some examples, the cross-sectional area of ​​the second sub-channel is greater than the cross-sectional area of ​​the first sub-channel.

[0010] In some examples, the first guide plate can be arranged at an angle that is adjustable.

[0011] In some examples, the first angle is an acute angle.

[0012] In some examples, the first air guide plate is fixed to an inner wall of the return air duct, so that the air guide mechanism is fixed in the return air duct.

[0013] In some examples, the first guide plate is fixed to the inner wall of the return air duct via welding, fasteners, or adhesives.

[0014] In some examples, the guide mechanism further includes a second guide plate, which is arranged to be inclined at a second angle relative to the first guide plate.

[0015] In some examples, the second guide plate extends parallel to a gas flow direction of the return air duct.

[0016] In some examples, the second guide plate can be arranged at an angle that is adjustable.

[0017] In some examples, the surface of the flow guiding mechanism is made of a corrosion-resistant material.

[0018] In some examples, the hot blast furnace includes a coal-fired, gas-fired, oil-fired, biomass-fired, or electrically heated hot blast furnace.

[0019] In some examples, the fresh air duct includes a first fresh air duct, which is connected to the return air duct and the hot air stove and is used to transport only the exhaust gas from the return air duct to the hot air stove.

[0020] In some examples, the fresh air duct includes a second fresh air duct, which is connected to the return air duct, the external cooling gas source and the hot air furnace. The fresh air duct mixes the exhaust gas from the return air duct and the cooling gas from the external cooling gas source and then transports them to the hot air furnace, wherein the second fresh air duct includes fresh air equipment.

[0021] In some examples, the fresh air duct includes a third fresh air duct, which is connected to an external cooling gas source and the hot air furnace. The third fresh air duct only transports cooling gas from the external cooling gas source to the hot air furnace, and the third fresh air duct includes fresh air equipment.

[0022] In some examples, a control valve is provided between the fresh air device and the external cooling gas source for controlling the flow of the external cooling gas in the fresh air pipeline through the fresh air device.

[0023] In some examples, the exhaust device includes an exhaust fan, the return air device includes a return air fan, and the air volume of the exhaust fan is greater than the air volume of the return air fan.

[0024] The technical effect of the present invention is that higher temperature return air can be introduced into the pipeline to cool the hot air furnace, thereby reducing or eliminating the use of cooling gas, and achieving more efficient recycling of exhaust gas to reduce exhaust gas emissions, and at the same time saving energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The features, advantages and other aspects of the various embodiments of the present invention will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Several embodiments of the present invention are shown herein in an illustrative and non-limiting manner. In the accompanying drawings:

[0026] Figure 1 An existing hot blast stove system is shown;

[0027] Figure 2 A first exemplary hot blast stove system according to an embodiment of the present invention is shown;

[0028] Figure 3 A second exemplary hot blast stove system according to an embodiment of the present invention is shown;

[0029] Figure 4 A third exemplary hot blast stove system according to an embodiment of the present invention is shown;

[0030] Figure 5 shows the arrangement of a first exemplary air guide mechanism relative to a return air duct according to an embodiment of the present utility model; and

[0031] Figure 6 FIG. 1 shows an arrangement of a second exemplary flow guiding mechanism relative to a pipeline according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] refer to Figure 1, shows an existing hot air furnace system 100. The hot air furnace system 100 includes a hot air furnace 101, an exhaust duct 106, a return air duct 107, and multiple fresh air ducts 108 and 109 (two are shown for illustration only, not limitation, and the number can be one or more). The hot air furnace 101 can be used to generate hot air to provide heat for heat-treated materials. The exhaust duct 106 is connected to the air outlet 1012 of the hot air furnace 101 and the external space 105 (e.g., the atmospheric environment). The exhaust duct 106 includes an exhaust device 102. The air inlet 1021 of the exhaust device 102 is connected to the air outlet 1012 of the hot air furnace 101 to discharge the hot air (also known as exhaust gas or flue gas) after heat treatment, and the air outlet 1022 of the exhaust device 102 is connected to the external space 105. The return air duct 107 connects to the exhaust duct 106 and the first air inlet 1011a of the hot blast stove 101 to obtain at least a portion of the exhaust gas discharged from the exhaust duct 106, thereby maintaining the pressure within the hot blast stove. The return air duct 107 includes a return air device 103, whose air inlet 1031 connects to the air outlet 1022 of the exhaust device 102, and whose air outlet 1032 connects to the first air inlet 1011a of the hot blast stove 101. Fresh air ducts 108 and 109 connect between the external cooling air source 110 and the second air inlets 1011b and 1011c of the hot blast stove 101 to cool one or more parts of the hot blast stove 101, such as the burner head 1013, the furnace wall (not shown), or other parts. The cooling air inlet of the hot blast furnace 101 can be set close to the part that needs to be cooled, for example, the air inlet 1011c is set close to the furnace head 1013, and the air inlet 1011b is set close to the furnace wall. The fresh air ducts 108 and 109 may include a fresh air device 104 (shown as one, for illustration only, not limitation, each fresh air duct may also include a separate fresh air device, or multiple fresh air ducts may share a fresh air device). The air inlet 1041 of the fresh air device 104 is connected to the external cooling air source 110, and the air outlet 1042 of the fresh air device 104 is connected to the second air inlet 1011b, 1011c of the hot blast furnace 101. Each of the exhaust device 102, the return air device 103, and the fresh air device 104 may include a fan, and the air volume of the fan is controllable (for example, by controlling the fan frequency or fan speed). In addition, the hot blast furnace can also be supplemented with air in various ways, such as combustion air, waste heat or external air sources, as is well known in the art. As mentioned above, introducing a large amount of cooling gas for cooling will additionally increase the energy consumption of the hot blast furnace.

[0033] refer to Figure 2, shows a first exemplary hot air furnace system 200A according to an embodiment of the present invention. Hot air furnace system 200A includes a hot air furnace 201, an exhaust duct 206, a return air duct 207, and a plurality of fresh air ducts 208 and 209 (two are shown for illustration only, not limitation; the number may be one or more). Hot air furnace 201 can be used to generate hot air to provide heat for heat-treated materials. Exhaust duct 206 connects to an air outlet 2012 of hot air furnace 201 and an external space 205 (e.g., the atmospheric environment). Exhaust duct 206 includes an exhaust device 202. An air inlet 1021 of exhaust device 202 connects to an air outlet 2012 of hot air furnace 201 to discharge the hot air (also known as exhaust gas or flue gas) after heat treatment. An air outlet 2022 of exhaust device 202 connects to external space 205. The return air duct 207 connects to the exhaust duct 206 and the first air inlet 2011a of the hot blast furnace 201. This duct receives at least a portion of the exhaust gas from the exhaust duct 206, which is then used to maintain the pressure within the hot blast furnace. For example, the return air duct 207 connects downstream of the exhaust device 202. The return air duct 207 includes a return air device 203. The air inlet 2031 of the return air device 203 connects to the air outlet 2022 of the exhaust device 202, and the air outlet 2032 of the return air device 203 connects to the first air inlet 2011a of the hot blast furnace 201. Fresh air ducts 208 and 209 connect between the return air duct 207 and the second air inlets 2011b and 2011c of the hot blast furnace 201 to cool one or more parts of the hot blast furnace 201, such as the furnace head 2013, furnace walls (not shown), or other parts. The cooling air inlet of the hot blast furnace 201 can be set close to the part that needs to be cooled, for example, the air inlet 2011c is set close to the furnace head 2013, and the air inlet 2011b is set close to the furnace wall. The exhaust device 202 may include an exhaust fan, and the return air device 203 may include a return air fan, and the air volume of the fan is controllable (for example, by controlling the fan frequency or the fan speed). For example, the air volume of the exhaust fan may be greater than the air volume of the return air fan. In addition, the hot blast furnace can also supplement the air in the furnace by various means, such as combustion-supporting air, waste heat or external air source, as is well known in the art. In addition, as Figure 2 As shown, the fresh air pipes 208 and 209 only transport the exhaust gas from the return air pipe to the hot air furnace.

[0034] and Figure 1 Compared with the existing hot blast stove system 100, Figure 2 The hot blast stove system 200A can eliminate the need for external cooling gas by introducing the hot blast stove's higher temperature exhaust gas from the return air duct into the fresh air duct for cooling the hot blast stove. It can also achieve more efficient recycling of exhaust gas to reduce hot blast stove flue gas emissions, which is beneficial to environmental protection, reduces air pollution, and at the same time can reduce the heat loss of the hot blast stove and save energy consumption.

[0035] For example, the energy savings can be calculated as follows:

[0036] Q=c·ρ·v·Δt

[0037] Where Q is the heating volume v cubic meters (m 3 ) of the air, the specific heat capacity of air c = 1.01kj / kg℃, the air density ρ = 1.205kg / m 3 , Δt is the rising temperature. The air volume v per unit time can be calculated as the air volume (m 3 / h) multiplied by unit time.

[0038] For example, when the hot air furnace tail gas with a higher temperature (e.g., 80°C) is used to replace the cooling gas source gas (e.g., room temperature 25°C), Δt is 55°C. When the air volume reaches several thousand m 3 / h, hundreds of kw of heat can be saved. For example, if 200 kw of heat is saved, the natural gas consumption saved per hour is about 20 cubic meters (m3). 3 ), or converted to 200 kWh of electricity saved per hour, which can significantly save energy consumption (for example, the use of various energy sources such as gas, oil, biomass fuel or electricity). For example, the hot air furnace can include a coal-fired, gas-fired, oil-fired, biomass-fired, or electrically heated hot air furnace.

[0039] For example, the exhaust device 202 can draw the hot air generated by the hot blast furnace into the processing space to interact with the hot air generated by the hot blast furnace 201, thereby thermally treating the material. For example, if the material is a water-rich material, the thermal treatment may include drying or dehydration. For example, a filtering device (such as a bag filter, dehumidification device, etc.) can be provided upstream of the air outlet 2012 of the hot blast furnace 201 to separate the heat-treated material from the exhaust gas.

[0040] like Figure 2 As shown, the air outlet 2032 of the return air device 203 is connected to the first air inlet 2011a of the hot blast furnace 201. The air outlet 2032 is connected to the second air inlets 2011b and 2011c of the multiple air inlets of the hot blast furnace 201 via the fresh air ducts 208 and 209. The return air duct 207 is connected to the fresh air ducts 208 and 209 via the flow guide mechanism 211. For example, the flow guide mechanism 211 can reduce the resistance of the exhaust gas from the return air duct 207 entering the fresh air duct, thereby increasing the return air volume, reducing the smoke emission of the hot blast furnace, and reducing air pollution.

[0041] For example, the guide mechanism 211 is set in the return air duct 207, and divides the channel of the duct 207 into multiple sub-channels, wherein the first air inlet 2011a of the hot air stove 201 is connected to the first sub-channel among the multiple sub-channels, and the fresh air duct is connected to the second sub-channel among the multiple sub-channels.

[0042] Go to Figure 5 , shows the arrangement of the first exemplary air guide mechanism relative to the return air duct 207 according to an embodiment of the present utility model. Figure 5 As shown, the guide mechanism 211 includes a first guide plate 2111, which divides the return air duct 207 into a plurality of sub-channels, such as a first sub-channel 2071 and a second sub-channel 2072 (as separated along the dashed lines). The first guide plate 2111 is arranged at a first angle α relative to the return air duct 207 to deflect the flow of gas in the second sub-channel 2072 from a first direction L1 to a second direction L2, so that the return air flows, for example, along the second direction L2 through the ducts to the fresh air ducts 208 and 209. The first guide plate 2111 can reduce the resistance of exhaust gas from the return air duct 207 to enter the fresh air duct, thereby increasing the return air volume, reducing hot blast furnace flue gas emissions, and reducing air pollution.

[0043] For example, the first deflector 2111 can be arranged at an angle α to change the air supply volume. For example, the first angle α is an acute angle and can be adjusted between 30° and 60° (such as 30°, 45°, 50°, and 60°), or between 10° and 80° (such as 10°, 30°, 45°, 50°, 60°, and 80°), etc. Furthermore, a larger angle can also help reduce the length of the connecting pipe between the return air duct 207 and the fresh air duct.

[0044] For example, the first deflector 2111 is fixed to the inner wall of the return air duct 207, so that the deflector mechanism 211 is fixed in the return air duct 207. For example, the first deflector 2111 can be fixed to the inner wall of the return air duct 207 by welding, fasteners, adhesive, or other means. For example, the first deflector 2111 can adopt a connection structure in which the entire plate is welded to the outer shell.

[0045] Go to Figure 6 , shows the arrangement of the second exemplary air guide mechanism relative to the return air duct 207 according to an embodiment of the present utility model. Figure 6As shown, in addition to the first deflector 2111, the deflector mechanism 211 also includes a second deflector 2112, which is arranged at a second angle β relative to the first deflector 2111. For example, the second deflector 2112 may extend substantially parallel to the gas flow direction L1 of the return air duct 207. The second deflector 2112 can further reduce the resistance of exhaust gas from the return air duct 207 to the fresh air duct, thereby increasing the return air volume, reducing hot air furnace flue gas emissions, and reducing air pollution.

[0046] For example, the second deflector 2112 can be arranged at an angle β to change the air supply volume. For example, the second angle β is an acute angle and can be adjusted between 30° and 60° (such as 30°, 45°, 50°, 60°, etc.), or between 10° and 80° (such as 10°, 30°, 45°, 50°, 60°, 80°, etc.), etc. For example, the second angle β can be a right angle.

[0047] exist Figure 5 and Figure 6 In the example, the cross-sectional area of ​​the second sub-channel 2072 can be larger than the cross-sectional area of ​​the first sub-channel 2071, so that more return air enters the fresh air duct for cooling, thereby reducing more energy consumption.

[0048] For example, the discharged hot air may contain corrosive components, and the surface of the guide mechanism 211 (the first guide plate 2111 and the second guide plate 2112) can be made of a corrosion-resistant material to protect the guide mechanism 211 from corrosion. For example, the surface of the guide mechanism 211 can be made of stainless steel, or the entire guide mechanism 211 can be made of stainless steel.

[0049] Go to Figure 3, shows a second exemplary hot blast stove system 200B according to an embodiment of the present invention. Hot blast stove system 200B is largely similar to hot blast stove system 200A, except that in hot blast stove system 200B, fresh air ducts 208 and 209 are further connected to an external cooling gas source 210. Fresh air ducts 208 and 209 mix exhaust gas from return air duct 207 (via a flow guide mechanism 211, as described above) with cooling gas from external cooling gas source 210 and then deliver the mixture to second air inlets 2011b and 2011c of hot blast stove 201 to cool one or more locations of hot blast stove 201, such as furnace head 2013, furnace walls (not shown), or other locations. Fresh air ducts 208 and 209 may include a fresh air device 204 (one is shown for illustration purposes only, not limitation; each fresh air duct may include a separate fresh air device, or multiple fresh air ducts may share a fresh air device). The air inlet 2041 of the fresh air device 204 is connected to the external cooling air source 210, and the air outlet 2042 of the fresh air device 204 is connected to the fresh air ducts 208 and 209, and further connected to the return air duct 207 and the second air inlets 2011b and 2011c of the hot air furnace 201. The fresh air device 204 may include a fan, and the air volume of the fan is controllable (for example, by controlling the fan frequency or fan speed).

[0050] and Figure 1 Compared with the existing hot blast stove system 100, Figure 3 The hot blast furnace system 200B introduces the high-temperature exhaust gas of the hot blast furnace from the return air duct into the fresh air duct, and mixes it with the cooling air introduced from the external cold zone air source 210 to cool the hot blast furnace. This can reduce the demand for external cooling gas and achieve more efficient recycling of exhaust gas to reduce the emission of hot blast furnace flue gas, which is beneficial to environmental protection and reduces air pollution. At the same time, it can reduce the heat energy loss of the hot blast furnace and save energy consumption, similar to the above Figure 2 described.

[0051] For example, when the return air volume cannot meet the cooling demand, the fresh air device 204 can be used to supplement the air volume for cooling, which can be suitable for modifying the existing hot air furnace. Figure 1 Compared with the hot blast stove system, the exhaust gas from the hot blast stove can be made to enter the fresh air ducts 208 and 209 from the return air duct 207 through the guide mechanism 211 and be mixed with the cooling air introduced from the external cold zone air source 210, thereby achieving flue gas emission reduction and energy saving and environmental protection.

[0052] For example, a control valve (not shown) may be provided between the air inlet 2041 of the fresh air device 204 and the external cooling gas source 210 to control the flow of the external cooling gas source 206 to the air inlet 2041 of the fresh air device 204, that is, to control the flow of the external cooling gas in the fresh air duct through the fresh air device 204. For example, when the return air volume increases, the amount of air supplied for cooling through the fresh air device 204 may be reduced or completely stopped. This can be achieved by regulating the amount of cooling gas passing through the air inlet 2041 through the control valve, thereby achieving more efficient gas recycling and further saving energy.

[0053] Go to Figure 4 , shows a third exemplary hot blast stove system 200C according to an embodiment of the present invention. Hot blast stove system 200C is largely similar to hot blast stove system 200B, except that in hot blast stove system 200C, fresh air duct 208 is connected only to return air duct 207, and fresh air duct 209 is connected only to external cooling gas source 210. Fresh air duct 208 delivers exhaust gas from return air duct 207 (via flow guide mechanism 211, as described above) to air inlet 2011b of hot blast stove 201, while fresh air duct 209 delivers cooling gas from external cooling gas source 210 to air inlet 2011c of hot blast stove 201 to cool one or more parts of hot blast stove 201, such as furnace head 2013, furnace walls (not shown), or other parts. Fresh air duct 209 may include fresh air equipment 204. The air inlet 2041 of the fresh air device 204 is connected to the external cooling air source 210, and the air outlet 2042 of the fresh air device 204 is connected to the fresh air pipeline 209, and further connected to the air inlet 2011c of the hot air furnace 201. The fresh air device 204 may include a fan, and the air volume of the fan is controllable.

[0054] and Figure 1 Compared with the existing hot blast stove system 100, Figure 3 The hot blast furnace system 200C can reduce the demand for external cooling gas by introducing the high temperature exhaust gas of the hot blast furnace from the return air duct to the fresh air duct, and realize the efficient recycling of more exhaust gas to reduce the emission of hot blast furnace flue gas, which is beneficial to environmental protection and reduces air pollution. At the same time, it can reduce the heat loss of the hot blast furnace and save energy consumption, similar to the above Figure 2 、 Figure 3 described.

[0055] In other words, various arrangements of the fresh air duct and the return air duct can be combined to utilize the exhaust gas of the hot blast stove to cool the hot blast stove.

[0056] For example, the first fresh air duct is arranged to communicate between the return air duct and the cooling air inlet of the hot blast stove, so as to transport only the exhaust gas from the return air duct to the hot blast stove.

[0057] For example, a second fresh air duct is arranged to connect between the return air duct and the cooling air inlet of the hot blast stove, and to connect between the external cooling gas source and the cooling air inlet of the hot blast stove, so as to mix the exhaust gas from the return air duct and the cooling gas from the external cooling gas source and then transport them to the hot blast stove.

[0058] For example, a third fresh air duct is arranged to connect between the external cooling gas source and the cooling air inlet of the hot blast stove, so as to deliver only the cooling gas from the external cooling gas source to the hot blast stove, so as to supplement the cooling gas when the return air is insufficient.

[0059] exist Figure 2-Figure 4 In the example, when the return air duct 207 is connected to the fresh air duct, a control valve (not shown) can be provided between the return air duct and the fresh air duct (208 and / or 209) to control the gas flow rate of the exhaust gas from the return air duct 207 to the fresh air duct (208 and / or 209).

[0060] In addition, the pressure inside the hot blast stove 201 can be maintained at a negative pressure relative to the external air pressure, for example, slightly lower than the atmospheric pressure, to prevent heat from leaking out.

[0061] In addition, in the above-mentioned embodiments of the present disclosure, the exhaust gas from the hot blast furnace can be directly returned to the hot blast furnace (via the return air duct and the fresh air duct) without passing through the heat exchanger, so as to further reduce heat energy loss (for example, due to heat exchange) and reduce system complexity, thereby reducing the cost of waste heat recovery.

[0062] Although embodiments of the present invention have been described with reference to several specific embodiments, it should be understood that the embodiments of the present invention are not limited to the specific embodiments disclosed. The embodiments of the present invention are intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A hot blast stove system, characterized in that: include: A hot air furnace having a plurality of air inlets and air outlets, wherein the hot air furnace is used to generate hot air, and the hot air is used to provide heat for the heat-treated material; an exhaust duct connected to the air outlet of the hot blast furnace and the external space, the exhaust duct including exhaust equipment; a return air duct connected to the exhaust duct and a first air inlet of the multiple air inlets of the hot blast furnace, for returning at least a portion of the exhaust gas of the hot blast furnace to the hot blast furnace and maintaining the pressure in the hot blast furnace at a negative pressure relative to the external air pressure, the return air duct including an air return device; The fresh air pipeline is connected to the return air pipeline and the second air inlet among the multiple air inlets of the hot blast stove, so as to cool the furnace head and / or furnace wall of the hot blast stove.

2. The hot blast stove system according to claim 1, characterized in that: The return air duct is connected to the fresh air duct via a flow guide mechanism.

3. The hot blast stove system according to claim 2, characterized in that: A control valve is provided between the return air duct and the fresh air duct for controlling the flow of gas transmitted from the return air duct to the fresh air duct.

4. The hot blast stove system according to claim 2, characterized in that: The guide mechanism is arranged in the return air duct and divides the channel of the return air duct into multiple sub-channels, wherein the first air inlet of the hot air stove is connected to the first sub-channel of the multiple sub-channels, and the fresh air duct is connected to the second sub-channel of the multiple sub-channels.

5. The hot blast stove system according to claim 4, characterized in that: The guide mechanism includes a first guide plate, which is arranged obliquely at a first angle relative to the return air duct to deflect the gas flow direction in the second sub-channel from a first direction to a second direction.

6. The hot blast stove system according to claim 5, characterized in that: The cross-sectional area of ​​the second sub-channel is greater than the cross-sectional area of ​​the first sub-channel.

7. The hot blast stove system according to claim 5, characterized in that: The first guide plate can be arranged at an angle that is adjustable.

8. The hot blast stove system according to claim 5, characterized in that: The first angle is an acute angle.

9. The hot blast stove system according to claim 5, characterized in that: The first air guide plate is fixed to the inner wall of the return air duct, so that the air guide mechanism is fixed in the return air duct.

10. The hot blast stove system according to claim 5, characterized in that: The first guide plate is fixed to the inner wall of the return air duct via welding, fasteners, or adhesive.

11. The hot blast stove system according to claim 5, characterized in that: The flow guide mechanism further includes a second flow guide plate, which is arranged to be inclined at a second angle relative to the first flow guide plate.

12. The hot blast stove system according to claim 11, characterized in that: The second guide plate extends parallel to the gas flow direction of the return air duct.

13. The hot blast stove system according to claim 11, characterized in that: The second guide plate can be arranged at an angle that is adjustable.

14. The hot blast stove system according to any one of claims 4 to 13, characterized in that: The surface of the flow-guiding mechanism is made of corrosion-resistant material.

15. The hot blast stove system according to claim 1, characterized in that: The hot blast furnace includes a coal-fired, gas-fired, oil-fired, biomass-fired, or electrically heated hot blast furnace.

16. The hot blast stove system according to claim 1, characterized in that: The fresh air pipeline includes a first fresh air pipeline, which is connected to the return air pipeline and the hot air stove and is used to transport only the exhaust gas from the return air pipeline to the hot air stove.

17. The hot blast stove system according to claim 1, characterized in that: The fresh air duct includes a second fresh air duct, which is connected to the return air duct, the external cooling gas source and the hot air furnace. The fresh air duct mixes the exhaust gas from the return air duct and the cooling gas from the external cooling gas source and then transports them to the hot air furnace, wherein the second fresh air duct includes fresh air equipment.

18. The hot blast stove system according to claim 16 or 17, characterized in that: The fresh air pipeline includes a third fresh air pipeline, which is connected to an external cooling gas source and the hot air stove. The third fresh air pipeline only transports cooling gas from the external cooling gas source to the hot air stove.

19. The hot blast stove system according to claim 17, characterized in that: A control valve is provided between the fresh air device and the external cooling gas source for controlling the flow of the external cooling gas in the fresh air pipeline through the fresh air device.

20. The hot blast stove system according to claim 1, characterized in that: The exhaust device includes an exhaust fan, the return air device includes a return air fan, and the air volume of the exhaust fan is greater than the air volume of the return air fan.

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