Blowing device, blast furnace blowing system and blowing method

Abstract

A blowing device (100), a blast furnace blowing system and a blowing method. The blowing device (100) comprises a blowing head (1) and a second blowing channel (23), wherein the blowing head (1) is internally provided with a first blowing channel (12) running therethrough in the axial direction thereof; the second blowing channel (23) is at least partially arranged in the blowing head (1) and is separated from the first blowing channel (12); and the second blowing channel (23) is located at the periphery of the first blowing channel (12) and is provided with a first blowing outlet (222), the first blowing outlet (222) being located on an outer side wall of the blowing head. Gas blown from the first blowing channel (12) and gas blown from the second blowing channel (23) may not interfere with each other, and injecting a hydrogen-rich gas and hot air into a blast furnace from the first blowing channel (12) and the second blowing channel (23), respectively, can reduce the impact on the hot air caused by the hydrogen-rich gas injected into the blast furnace, thereby facilitating the improvement of a blowing effect for the hydrogen-rich gas and the increase of the yield of the blast furnace.

Description

Injection device, blast furnace injection system and injection method Technical Field

[0001] The present invention relates to the technical field of blast furnace injection, and in particular to a injection device, a blast furnace injection system and an injection method. Background Art

[0002] As the main production method of ironmaking in my country at this stage, the blast furnace accounts for more than 70% of the carbon consumption of the long process of steel smelting. Therefore, reducing the carbon consumption of blast furnaces is the most effective measure to reduce carbon emissions in the steel industry. Injecting hydrogen-rich gas into the blast furnace can not only improve smelting efficiency and reduce pollutant emissions, but also reduce coke consumption, reducing the carbon consumption of the blast furnace from the source, thereby reducing carbon emissions. However, the existing method of injecting hydrogen-rich gas mostly uses a spray gun to enter the blast furnace together with hot air. When injecting hydrogen-rich gas, the hot air intake of the blast furnace will be greatly affected, thereby affecting the output of the blast furnace. Therefore, how to reduce the impact on the hot air while injecting large doses of hydrogen-rich gas, so as to achieve the best injection effect of hydrogen-rich gas and ensure the production and carbon reduction of the blast furnace, has become a problem that needs to be solved urgently.

[0003] Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a blowing device, a blast furnace blowing system and a blowing method for reducing the impact of hydrogen-rich gas injected into the blast furnace on the hot air, so as to improve the blowing effect of hydrogen-rich gas and blast furnace output.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a blowing device, comprising:

[0006] A blowing head, wherein a first blowing channel is provided in the blowing head and extends along the axial direction thereof; and

[0007] The second blowing channel is at least partially arranged in the blowing head and separated from the first blowing channel, and the second blowing channel is located outside the first blowing channel. The second blowing channel has a first blowing outlet, and the first blowing outlet is located on the outer wall of the blowing head.

[0008] Optionally, the blowing head includes a lower body located below the axis of the first blowing channel, and the first blowing outlet is located on the outer side wall of the lower body.

[0009] Optionally, the blowing head includes an inner sleeve and an outer sleeve, at least part of the inner sleeve is located on the inner side of the outer sleeve, a cooling cavity is formed between the outer wall of the inner sleeve and the inner wall of the outer sleeve, and at least part of the second blowing channel is located in the cooling cavity.

[0010] Optionally, the cooling chamber includes a large chamber area and a small chamber area whose volume is smaller than the large chamber area. The large chamber area and the small chamber area are arranged along the blowing direction of the first blowing channel. The large chamber area is close to the injection end of the first blowing channel, and the small chamber area is close to the injection end of the first blowing channel.

[0011] Optionally, the second blowing channel includes a blowing main pipe and a first blowing branch pipe and a second blowing branch pipe connected to the blowing main pipe, the first blowing outlet is formed on the first blowing branch pipe, the second blowing branch pipe has a second blowing outlet, the first blowing outlet is located below the axial center line of the first blowing channel, the second blowing outlet is located above the axial center line of the first blowing channel, and is arranged on the end wall of the blowing head close to the ejection end of the first blowing channel.

[0012] Optionally, the blowing main pipe is close to the injection end of the first blowing channel, the first blowing outlet and the second blowing outlet are close to the discharge end of the first blowing channel, the first blowing branch pipe and / or the second blowing branch pipe has a turning section located between the injection end of the first blowing channel and the discharge end of the first blowing channel, and the turning section is located in the large cavity area.

[0013] Optionally, the blowing main pipe is located above the axial centerline of the first blowing channel, the changing section is formed by a partial pipe section of the first blowing branch pipe, the inlet end of the changing section is connected to the blowing main pipe, and the changing section extends within the large cavity area to below the axial centerline of the first blowing channel.

[0014] Optionally, the direction-changing section is arc-shaped or spirally wrapped around the outer wall of the inner sleeve.

[0015] Optionally, the total number of the first blowing outlets and the second blowing outlets is two or more, and the first blowing outlets and the second blowing outlets are distributed along the circumference of the blowing head.

[0016] Optionally, the axis of the first blowing outlet is inclined relative to the axis of the first blowing channel.

[0017] Optionally, the angle between the axis of the first blowing outlet and the axis of the first blowing channel is θ, 0°<θ≤60°.

[0018] Optionally, the blowing head includes a copper head; and the second blowing channel includes a carbon steel pipe and / or a heat-resistant stainless steel pipe.

[0019] Optionally, the inner wall of the second blowing channel is provided with an anti-corrosion coating.

[0020] Optionally, the gas blown into the first blowing channel includes hot air, and the gas blown into the second blowing channel includes hydrogen-rich gas or protective gas; when the gas blown into the second blowing channel is the hydrogen-rich gas, the hydrogen-rich gas is at room temperature, and the pressure of the hydrogen-rich gas is greater than the pressure of the hot air in the first blowing channel by 0.05 MPa or more.

[0021] To achieve the above-mentioned and other related purposes, the present application further provides a blast furnace injection system, comprising at least one injection device as described above, and further comprising:

[0022] a first distributor, the first distributor being used to distribute the hydrogen-rich gas;

[0023] a second distributor configured to distribute the shielding gas; and

[0024] A connecting pipe, wherein an air inlet end of the connecting pipe is connected to the first distributor and the second distributor respectively, and an air outlet end of the connecting pipe is connected to the second blowing channel.

[0025] Optionally, the first distributor and / or the second distributor has at least two distribution branches, and the distribution branches are suitable for connecting to the air inlet end of the connecting pipe.

[0026] Optionally, the connecting pipe is threadedly connected or flanged to the second blowing channel, and a check valve is provided between the connecting pipe and the second blowing channel, and the check valve is suitable for limiting the gas in the second blowing channel from flowing back into the connecting pipe.

[0027] Optionally, the connecting pipe includes a connecting main pipe, a first connecting branch pipe and a second connecting branch pipe that are interconnected, the connecting main pipe is connected to the second blowing channel, the first connecting branch pipe and the second connecting branch pipe are connected to the first distributor and the second distributor respectively, and the first connecting branch pipe and the second connecting branch pipe are provided with gas control valves.

[0028] To achieve the above-mentioned and other related purposes, the present application further provides a blowing method for blowing gas into a blast furnace through the blast furnace blowing system as described above, comprising:

[0029] When hydrogen-rich gas is injected into the blast furnace through the injection head, the first gas path of the connecting pipe is opened, the first gas path is the gas path connecting the first distributor and the injection head, and the second gas path of the connecting pipe is closed, the second gas path is the gas path connecting the second distributor and the injection head;

[0030] When the protective gas is sprayed into the blast furnace through the spray head, the second gas path is opened and the first gas path is closed.

[0031] As described above, the blowing device, blast furnace blowing system and blowing method of the present invention have at least the following beneficial effects: the second blowing channel is located outside the first blowing channel, and the first blowing outlet of the second blowing channel is located on the outer side wall of the blowing head, so that the gases blown by the first blowing channel and the second blowing channel can not interfere with each other, and the hydrogen-rich gas and hot air are sprayed into the blast furnace from the first blowing channel and the second blowing channel respectively, which can reduce the impact of the hydrogen-rich gas sprayed into the blast furnace on the hot air, thereby helping to improve the blowing effect of the hydrogen-rich gas and the blast furnace output. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 shows a front view of an embodiment of a blowing device of the present invention;

[0033] FIG2 shows a cross-sectional view taken at AA in FIG1 ;

[0034] FIG3 is a schematic structural diagram of an embodiment of a blast furnace injection system according to the present invention.

[0035] Explanation of part numbers: blowing device 100, blowing head 1, annular baffle 11, first blowing channel 12, injection end 121, ejection end 122, inner sleeve 13, outer sleeve 14, cooling chamber 15, large chamber area 151, small chamber area 152, cooling inlet 153, cooling outlet 154, upper body 16, lower body 17, second blowing channel 2, blowing main pipe 21, blowing inlet 211, first blowing branch 22, changing section 221, first blowing outlet 222, second blowing branch 23, second blowing outlet 231, first distributor 3, second distributor 4, connecting pipe 5, first connecting branch 51, second connecting branch 52, connecting main pipe 53, distribution branch 6, check valve 71, gas control valve 72, pressure detection device 73, flow detection device 74. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0037] It should be noted that the diagrams provided in the present embodiment are only schematic illustrations of the basic concept of the present invention. The diagrams only show the components related to the present invention and are not drawn according to the number, shape and size of the components during actual implementation. The type, quantity and ratio of each component during actual implementation can be changed at will, and the component layout type may also be more complex. The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read. They are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of the present invention without substantially changing the technical content.

[0038] Before describing the embodiments of the present invention in detail, we first describe its application context. The technology of this invention is primarily applied in the field of blast furnace injection technology, particularly in the injection of hot blast and hydrogen-rich gas into blast furnaces. This invention addresses the technical problem of hydrogen-rich gas easily affecting the hot blast intake rate.

[0039] Referring to Figures 1 and 2, in some optional embodiments, the present application provides a blowing device, including a blowing head 1 and a second blowing channel 2. The blowing head 1 is provided with a first blowing channel 12 extending axially therethrough; at least a portion of the second blowing channel 2 is disposed within the blowing head 1 and is separated from the first blowing channel 12, and the second blowing channel 2 is located on the periphery of the first blowing channel 12. The second blowing channel 2 has a first blowing outlet 222, and the first blowing outlet 222 is located on the outer side wall of the blowing head 1. The number and size of the second blowing channels 2 can be set according to the demand for gas blowing volume, which is simple and convenient and conducive to adapting to different production conditions.

[0040] Optionally, the gas injected into the first injection channel 12 includes hot air, and the gas injected into the second injection channel 2 includes hydrogen-rich gas or protective gas. When the gas injected into the second injection channel 2 is hydrogen-rich gas, the hydrogen-rich gas is at room temperature, and the pressure of the hydrogen-rich gas is 0.05 MPa or more greater than the pressure of the hot air in the first injection channel 12. The appropriate pressure difference not only facilitates the injection of hydrogen-rich gas into the blast furnace, but also helps prevent the backflow of hydrogen-rich gas and coal gas in the blast furnace. Furthermore, the temperature of the hot air is T1, 900°C ≤ T1 ≤ 1300°C, and the temperature of the hydrogen-rich gas is T2, 0°C ≤ T2 ≤ 60°C.

[0041] Optionally, the axis of the first blowing outlet 222 is tilted relative to the axis of the first blowing channel 12, so that the gas sprayed from the first blowing outlet 222 and the hot air sprayed from the first blowing channel 12 gradually move away from each other, reducing the risk of mutual interference; wherein, when the blowing device is in normal operation, the axis of the first blowing channel 12 is tilted downward, which is beneficial for the gas to be sprayed into the blast furnace and for reducing the impact of the slag, molten iron or other falling melts in the blast furnace on the first blowing channel 12. Furthermore, the angle between the axis of the first blowing outlet 222 and the axis of the first blowing channel 12 is θ, 0°<θ≤60°, so that the gas sprayed from the first blowing outlet 222 is as close to the internal center of the blast furnace as possible while avoiding the gas sprayed from the first blowing channel 12, which is beneficial for improving the blowing effect and blast furnace output. Specifically, θ can be any value among 1°, 4°, 6°, 11°, 20°, 25°, 30°, 45°, 50° or 60°.

[0042] Optionally, the blowing head 1 includes a lower body 17 located below the axis of the first blowing channel 12, and the first blowing outlet 222 is located on the outer side wall of the lower body 17, that is, the first blowing outlet 222 can face downward, which is beneficial to prevent the iron slag, molten iron or other fallen melts in the blast furnace from dripping onto or entering the first blowing outlet 222. Furthermore, the blowing head 1 also includes an upper body 16 located above the axis of the first blowing channel 12. It can be understood that the upper body 16 is located above the lower body 17. The "upper", "lower", "above" and "below" indicated in this application are based on the orientation of the blowing device when it is in normal operating state.

[0043] Optionally, the inner wall of the second blowing channel 2 is provided with an anti-corrosion coating, which is beneficial to improving the anti-corrosion performance of the second blowing channel 2 and extending the service life of the second blowing channel 2.

[0044] Optionally, the second blowing channel 2 comprises a carbon steel pipe and / or a heat-resistant stainless steel pipe, which is sealed and fixedly installed inside the blowing head 1. Alternatively, the portion of the second blowing channel 2 located inside the blowing head 1 is formed by a hollow channel structure directly formed inside the blowing head 1.

[0045] Optionally, the inner diameter of the injection end 121 of the first injection channel 12 is larger than the inner diameter of the ejection end 122 of the first injection channel 12. Furthermore, the inner diameter of the first injection channel 12 gradually decreases from the injection end 121 to the ejection end 122. This structural design enables the gas ejected from the first injection channel 12 to reach a relatively high velocity, thereby meeting the injection requirements, for example, 230 m / s or above.

[0046] In the blowing device of this embodiment, the second blowing channel 2 is located at the periphery of the first blowing channel 12 and is separated from the first blowing channel 12. The second blowing channel 2 does not occupy the first blowing channel 12, so that after the hot air in the first blowing channel 12 enters the interior of the blast furnace, the area of ​​the tuyere vortex zone can be increased, and the kinetic energy of the blast can be improved; the first blowing outlet 222 of the second blowing channel 2 is located on the outer wall of the blowing head 1, so that the gases blown by the first blowing channel 12 and the second blowing channel 2 can not interfere with each other, and the hydrogen-rich gas and hot air are respectively sprayed into the blast furnace from the first blowing channel 12 and the second blowing channel 2, and are sprayed independently, which can reduce the impact of the hydrogen-rich gas injected into the blast furnace on the hot air, thereby helping to improve the blowing effect of the hydrogen-rich gas, increase the output of the blast furnace and reduce carbon emissions. In addition, the second blowing channel 2 is integrated on the blowing head 1, and there is no need to set up an additional gas spray gun separately, which reduces equipment investment, avoids frequent replacement of spray guns, reduces the safety risks of maintenance operators, and improves safety.

[0047] 1 and 2 , in some optional embodiments, a cooling cavity 15 is provided in the blowing head 1. The cooling cavity 15 is distributed around the periphery of the first blowing channel 12, and at least a portion of the second blowing channel 2 is located within the cooling cavity 15. The blowing head 1 includes an inner casing 13 and an outer casing 14. At least a portion of the inner casing 13 is located inside the outer casing 14, and the cooling cavity 15 is formed between the outer wall of the inner casing 13 and the inner wall of the outer casing 14.

[0048] Optionally, the outer sleeve 14 and the inner sleeve 13 can be sealed and connected by welding, which is simple and reliable. The outer sleeve 14 and the inner sleeve 13 can be welded together through a copper matrix.

[0049] Optionally, the outer side wall of the lower body 17 is the outer side wall of the outer shell 14 at a portion below the axis of the first blowing channel 12 .

[0050] Optionally, the outer diameter of the injection end 121 of the blowing head 1 near the first blowing channel 12 is greater than the outer diameter of the ejection end 122 of the blowing head 1 near the first blowing channel 12. Furthermore, the outer diameter of the blowing head 1 gradually decreases from the injection end 121 near the first blowing channel 12 to the ejection end 122 near the first blowing channel 12, so that the outer diameter of the blowing head 1 and the inner diameter of the first blowing channel 12 change in a substantially consistent direction. In other words, the wall thickness of the outer sleeve 14 is uniform, and the wall thickness of the inner sleeve 13 is uniform, so that the wall thickness difference of each area of ​​the blowing head 1 is small and the wall thickness is uniform, which is conducive to ensuring the cooling effect and extending the service life of the blowing head 1.

[0051] Optionally, the blowing head 1 includes a copper head. The copper head has good thermal conductivity, which is beneficial to improving the cooling effect and extending the service life of the blowing head 1.

[0052] Optionally, a cooling inlet 153 and a cooling outlet 154 communicating with the cooling cavity 15 are provided on the blowing head 1 . The cooling medium is introduced from the cooling inlet 153 and discharged from the cooling outlet 154 after passing through the cooling cavity 15 .

[0053] In the blowing device of the above embodiment, a cooling chamber 15 is provided in the blowing head 1 so that a cooling medium can be introduced into the cooling chamber 15 to achieve heat dissipation, which is beneficial to reducing the temperature of the blowing head 1, avoiding excessive temperature of the blowing head 1, and helping to extend the service life of the blowing head 1; in addition, at least part of the second blowing channel 2 is located in the cooling chamber 15. On the one hand, the second blowing channel 2 can be cooled by the cooling chamber 15 to avoid damage caused by excessive temperature of the second blowing channel 2. On the other hand, the continuous flow of gas in the second blowing channel 2 can also help take away some heat, thereby improving the cooling effect on the blowing head 1.

[0054] Referring to Figures 1 and 2, in some optional embodiments, the cooling chamber 15 includes a large chamber area 151 and a small chamber area 152 whose volume space is smaller than the large chamber area 151. The large chamber area 151 and the small chamber area 152 are arranged along the blowing direction of the first blowing channel 12, the large chamber area 151 is close to the injection end 121 of the first blowing channel 12, and the small chamber area 152 is close to the injection end 122 of the first blowing channel 12.

[0055] Optionally, an annular baffle 11 is provided in the small cavity area 152, so that the cooling path in the small cavity area 152 is spiral, which can increase the flow rate of the cooling medium in the small cavity area 152 and enhance the cooling effect on the hot surface of the blowing head 1; wherein, the hot surface of the blowing head 1 is the surface of the blowing head 1 close to its ejection end 122. The hot surface is in direct contact with the hot air and hot coal flow inside the blast furnace. The ambient temperature is relatively high, sometimes reaching above 2000°C. A better cooling effect is conducive to extending the service life of the blowing head 1. The surface of the blowing head 1 close to its injection end 121 is a cold surface. Furthermore, the cooling medium enters from the cooling inlet 153, flows through the large cavity area 151 and the small cavity area 152 in sequence, and then flows out from the cooling medium outlet.

[0056] Optionally, the second blowing channel 2 includes a blowing main pipe 21 and a first blowing branch pipe 22 and a second blowing branch pipe 23 connected to the blowing main pipe 21. The first blowing outlet 222 is formed on the first blowing branch pipe 22, and the second blowing branch pipe 23 has a second blowing outlet 231. The first blowing outlet 222 is located below the axis of the first blowing channel 12, that is, the first blowing outlet 222 is located on the lower body 17; the second blowing outlet 231 is located above the axis of the first blowing channel 12 and is provided on the end wall of the blowing head 1 near the ejection end 122 of the first blowing channel 12, that is, the second blowing outlet 231 is located on the upper body 16. This structural design enables the blowing head 1 to have blowing outlets for ejecting gas at both the top and the bottom, which is conducive to dispersing the blowing gas, improving the uniformity of the gas blowing, making the gas action range wider, and helping to improve the blowing effect.

[0057] Optionally, the blowing main pipe 21 is close to the injection end 121 of the first blowing channel 12, the first blowing outlet 222 and the second blowing outlet 231 are close to the injection end 122 of the first blowing channel 12, and the first blowing branch pipe 22 and / or the second blowing branch pipe 23 have a turning section 221 located between the injection end 121 of the first blowing channel 12 and the injection end 122 of the first blowing channel 12, and the turning section 221 is located in the large cavity area 151. Furthermore, the blowing main pipe 21 can be arranged at any height position of the first end face of the blowing head 1. The first end face is the end face of the blowing head 1 close to the injection end 121 of the first blowing channel 12. When any one of the first blowing branch pipe 22 and the second blowing branch pipe 23 needs to change direction, the change of direction can be achieved through the changing section 221 formed by its own partial pipe section structure. That is, the first blowing branch pipe 22 and the second blowing branch pipe 23 can be changed to above or below the axial center line of the first blowing channel 12 through the changing section 221, so that the first blowing outlet 222 and the second blowing outlet 231 can be arranged at a preset position, thereby ensuring the blowing effect.

[0058] Optionally, the first blowing branch pipe 22 and / or the second blowing branch pipe 23 may have a straight pipe section. Furthermore, the straight pipe section may be arranged within the small cavity area 152. When the first blowing branch pipe 22 and / or the second blowing branch pipe 23 are redirected to a preset orientation via the redirecting section 221, the straight pipe section design is adopted. This helps reduce the space occupied by the small cavity area 152, reduces the impact on the flow rate of the cooling medium, and thus reduces the impact on the cooling effect.

[0059] Optionally, the main injection pipe 21 is located above the axis of the first injection channel 12, and the redirecting section 221 is formed by a portion of the first branch injection pipe 22. The inlet end of the redirecting section 221 is connected to the main injection pipe 21, and the redirecting section 221 extends within the large cavity area 151 to a position below the axis of the first injection channel 12. Furthermore, the second branch injection pipe 23 has a straight pipe section, and the second injection outlet 231 is formed on the straight pipe section. The axis of the straight pipe section of the second branch injection pipe 23 is parallel to the axis of the first injection channel 12. This not only facilitates the hydrogen-rich gas injected from the second injection outlet 231 to be directed toward the center of the blast furnace, but also helps to reduce the interference of the hydrogen-rich gas with the hot air ejected from the first injection channel 12.

[0060] Optionally, the direction-changing section 221 is arc-shaped or spirally wrapped around the outer wall of the inner sleeve body 13 .

[0061] Optionally, the total number of the first blowing outlets 222 and the second blowing outlets 231 is two or more, and the first blowing outlets 222 and the second blowing outlets 231 are distributed along the circumference of the blowing head 1. Furthermore, the number of the first blowing outlets 222 can be one, two, or more, and the number of the second blowing outlets 231 can be one, two, or more.

[0062] In the spraying device of the above embodiment, the cooling cavity 15 includes a large cavity area 151 and a small cavity area 152, which is conducive to ensuring the circulation speed of the cooling medium and the cooling effect; in addition, the turning section 221 is arranged in the large cavity area 151 with a larger volume space. The large cavity area 151 has sufficient volume space to circulate the cooling medium, which is conducive to reducing the impact on the flow rate of the cooling medium, thereby ensuring the cooling effect.

[0063] Referring to Figures 1 to 3, in some optional embodiments, the present application further provides a blast furnace injection system, comprising at least one injection device 100 as described in any of the aforementioned embodiments, and further comprising a first distributor 3, a second distributor 4, and a connecting pipe 5. The first distributor 3 is used to distribute hydrogen-rich gas; the second distributor 4 is used to distribute protective gas; the gas inlet end of the connecting pipe 5 is connected to the first distributor 3 and the second distributor 4, respectively, and the gas outlet end of the connecting pipe 5 is connected to the second injection channel 2.

[0064] Optionally, the first distributor 3 and / or the second distributor 4 has at least two distribution branches 6, which are suitable for connecting to the air inlet end of the connecting pipe 5. The distribution branch 6 can be connected to different blowing devices to provide the gas required for blowing to multiple blowing devices.

[0065] Optionally, the connecting pipe 5 is threadedly connected or flanged to the second blowing channel 2 , and a check valve 71 is provided between the connecting pipe 5 and the second blowing channel 2 , and the check valve 71 is suitable for limiting the gas in the second blowing channel 2 from flowing back into the connecting pipe 5 .

[0066] Optionally, the connecting pipe 5 includes a connecting main pipe 53, a first connecting branch pipe 51, and a second connecting branch pipe 52 that are interconnected. The connecting main pipe 53 is connected to the second blowing channel 2, and the first connecting branch pipe 51 and the second connecting branch pipe 52 are respectively connected to the first distributor 3 and the second distributor 4. The first connecting branch pipe 51 and the second connecting branch pipe 52 are provided with a gas control valve 72, and the amount of gas flowing through the first connecting branch pipe 51 and the second connecting branch pipe 52 can be controlled by the gas control valve 72. Furthermore, two gas control valves 72 are provided on each of the first connecting branch pipe 51 and the second connecting branch pipe 52, one of which is an automatic valve for remote control, which is conducive to achieving automated control, and the other gas control valve 72 is a manual valve that can be manually operated so that the gas circuit can be opened and closed by the manual valve when the automatic valve fails.

[0067] Optionally, a pressure detection device 73 and a flow detection device 74 are further installed on the first connecting branch pipe 51 to detect the pressure and flow of the gas in the first connecting branch pipe 51. Furthermore, the pressure detection device 73 and the flow detection device 74 are located between the two gas control valves 72.

[0068] The blast furnace injection system of the above embodiment can inject different gases into the blast furnace according to demand through the first distributor 3 and the second distributor 4; based on this, the first distributor 3 and the second distributor 4 both have multiple distribution branches 6. When the first distributor 3 stops supplying hydrogen-rich gas to a certain injection device, the second distributor 4 supplies protective gas to the injection device, which can prevent the backflow of hot air and coal gas in the blast furnace, and the injection device and other injection devices can also continue the injection operation, and each injection device does not affect each other.

[0069] Referring to Figures 1 to 3, in some optional embodiments, the present application also provides a blowing method for blowing gas into a blast furnace through a blast furnace blowing system as in any of the aforementioned embodiments, including: when blowing hydrogen-rich gas into the blast furnace through the blowing head 1, opening the first gas path of the connecting pipe 5, the first gas path is the gas path connecting the first distributor 3 and the blowing head 1, and closing the second gas path of the connecting pipe 5, the second gas path is the gas path connecting the second distributor 4 and the blowing head 1; when blowing protective gas into the blast furnace through the blowing head 1, opening the second gas path and closing the first gas path.

[0070] Optionally, the pipeline forming the first gas circuit includes the first connecting branch pipe 51 and the connecting main pipe 53; the pipeline forming the second gas circuit retains the second connecting branch pipe 52 and the connecting main pipe 53.

[0071] Optionally, each distribution branch pipe 6 of the first distributor 3 is connected to a different blowing head 1. When hydrogen-rich gas needs to be sprayed, the gas control valve 72 on the first connecting branch pipe 51 is opened, and the gas control valve 72 on the second connecting branch pipe 52 is closed. At the same time, the flow rates of the different distribution branches 6 are monitored by the flow detection device 74. When the flow rates are inconsistent, the opening size of the gas control valve 72 on the first connecting branch pipe 51 is adjusted to make the flow rates of the various distribution branches 6 of the first distributor 3 consistent. When the spraying of hydrogen-rich gas stops, the gas control valve 72 on the first connecting branch pipe 51 is closed, and the gas control valve 72 on the second connecting branch pipe 52 is opened, and protective gas is sprayed into the blast furnace to prevent the backflow of hot air and coal gas in the furnace, which is beneficial to protecting the blowing head 1.

[0072] The injection method of the above embodiment is simple to inject and easy to operate. The type and flow rate of the injection gas can be adjusted according to demand to meet different blast furnace production conditions and has a wide range of applications.

[0073] The injection device, blast furnace injection system and injection method of the present invention can avoid the influence of hydrogen-rich gas on hot air, realize uniform and independent injection of blast furnace tuyere, realize large-dose injection of hydrogen-rich gas, improve the injection effect of hydrogen-rich gas, and realize production maintenance and carbon reduction of blast furnace.

[0074] Throughout this specification, references to terms such as "this embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0075] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A blowing device, characterized in that, Comprising: A blowing head, inside which there is a first blowing channel penetrating axially along it; And A second blowing channel, at least part of which is arranged inside the blowing head, separated from the first blowing channel, and the second blowing channel is located on the periphery of the first blowing channel. The second blowing channel has a first blowing outlet, and the first blowing outlet is located on the outer side wall of the blowing head.

2. The injection device according to claim 1, characterized in that: The blowing head includes a lower body located below the axis of the first blowing channel, and the first blowing outlet is located on the outer side wall of the lower body.

3. The injection device according to claim 1, characterized in that: The blowing head includes an inner sleeve body and an outer sleeve body. At least part of the inner sleeve body is located inside the outer sleeve body. A cooling cavity is formed between the outer side wall of the inner sleeve body and the inner side wall of the outer sleeve body. At least part of the second blowing channel is located inside the cooling cavity.

4. The injection device according to claim 3, characterized in that: The cooling cavity includes a large cavity area and a small cavity area with a volume smaller than that of the large cavity area. The large cavity area and the small cavity area are arranged along the blowing direction of the first blowing channel. The large cavity area is close to the injection end of the first blowing channel, and the small cavity area is close to the ejection end of the first blowing channel.

5. The injection device according to claim 4, characterized in that: The second blowing channel includes a blowing main pipe, a first blowing branch pipe and a second blowing branch pipe communicated with the blowing main pipe. The first blowing outlet is formed on the first blowing branch pipe. The second blowing branch pipe has a second blowing outlet. The first blowing outlet is located below the axis of the first blowing channel, and the second blowing outlet is located above the axis of the first blowing channel and is arranged on the end wall of the blowing head close to the ejection end of the first blowing channel.

6. The injection device according to claim 5, wherein: The blowing main pipe is close to the injection end of the first blowing channel. The first blowing outlet and the second blowing outlet are close to the ejection end of the first blowing channel. The first blowing branch pipe and / or the second blowing branch pipe has a deflecting section located between the injection end and the ejection end of the first blowing channel, and the deflecting section is located inside the large cavity area.

7. The injection device according to claim 6, characterized in that: The blowing main pipe is located above the axis of the first blowing channel. The deflecting section is formed by a partial pipe section of the first blowing branch pipe. The inlet end of the deflecting section is communicated with the blowing main pipe, and the deflecting section extends inside the large cavity area to be located below the axis of the first blowing channel.

8. The injection device according to claim 6 or 7, characterized in that: The deflecting section is arc-shaped or spiral-shaped around the outer side wall of the inner sleeve body.

9. The injection device according to claim 5, characterized in that: The total number of the first blowing outlets and the second blowing outlets is two or more, and the first blowing outlets and the second blowing outlets are distributed circumferentially along the blowing head.

10. The injection device according to claim 1, characterized in that: The axis of the first blowing outlet is inclined relative to the axis of the first blowing channel.

11. The injection device according to claim 10, characterized in that: The included angle between the axis of the first blowing outlet and the axis of the first blowing channel is θ, where 0° < θ ≤ 60°.

12. The injection device according to claim 1, characterized in that: The blowing head includes a copper head; the second blowing channel includes a carbon steel pipe and / or a heat-resistant stainless steel pipe.

13. The injection device according to claim 1, characterized in that: The inner wall of the second blowing channel is provided with an anti-corrosion coating.

14. The injection device according to claim 1, characterized in that: The gas blown in the first blowing channel includes hot air, and the gas blown in the second blowing channel includes hydrogen-rich gas or protective gas; when the gas blown in the second blowing channel is the hydrogen-rich gas, the hydrogen-rich gas is at room temperature, and the pressure of the hydrogen-rich gas is 0.05 MPa or more higher than the pressure of the hot air in the first blowing channel.

15. A blast furnace injection system, characterized in that: Comprising at least one blowing device according to any one of claims 1 to 14, further comprising: A first distributor for distributing hydrogen-rich gas; A second distributor for distributing protective gas; and A connecting pipe, the intake end of the connecting pipe is respectively connected to the first distributor and the second distributor, and the outlet end of the connecting pipe is connected to the second blowing channel.

16. The blast furnace injection system according to claim 15, characterized in that: The first distributor and / or the second distributor has at least two distribution branch pipes, and the distribution branch pipes are adapted to be connected to the intake end of the connecting pipe.

17. The blast furnace injection system according to claim 15, characterized in that: The connecting pipe is threadedly connected or flange-connected to the second blowing channel, and a check valve is provided between the connecting pipe and the second blowing channel, and the check valve is adapted to restrict the gas in the second blowing channel from flowing back into the connecting pipe.

18. The blast furnace injection system according to claim 15, characterized in that: The connecting pipe includes a connecting main pipe, a first connecting branch pipe and a second connecting branch pipe that are connected in communication. The connecting main pipe is connected to the second blowing channel, the first connecting branch pipe and the second connecting branch pipe are respectively connected to the first distributor and the second distributor, and gas control valves are provided on the first connecting branch pipe and the second connecting branch pipe.

19. A blowing method, characterized in that, Blowing gas into the blast furnace through the blast furnace blowing system according to any one of claims 15 to 18, including: When blowing hydrogen-rich gas into the blast furnace through the blowing head, the first gas path of the connecting pipe is opened, the first gas path is the gas path connecting the first distributor and the blowing head, and the second gas path of the connecting pipe is closed, and the second gas path is the gas path connecting the second distributor and the blowing head; When blowing protective gas into the blast furnace through the blowing head, the second gas path is opened and the first gas path is closed.

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