Hydrogen-based gas injection system

Abstract

The application provides a hydrogen series gas blowing system, and relates to the technical field of sintering.The hydrogen series gas blowing system comprises at least one hydrogen series gas blowing device arranged above a sintering trolley.The hydrogen series gas blowing device comprises a blowing cover, a hydrogen series gas blowing pipeline, a gas flow adjusting piece and an X-ray imaging device.The blowing cover is arranged above the sintering trolley;one end of the hydrogen series gas blowing pipeline extends into the blowing cover and blows hydrogen series gas into the blowing cover;the X-ray imaging device is arranged in the blowing cover and measures the temperature inside a sintering material layer in the sintering trolley; and the gas flow adjusting piece is arranged on the hydrogen series gas blowing pipeline.The hydrogen series gas blowing system can make the heat distribution inside the sintering material layer tend to an ideal state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sintering, in particular to a hydrogen-based gas injection system. BACKGROUND

[0002] In recent years, in the face of global warming, CO2 emission reduction has become a top priority for the steel industry. Sintering and blast furnace process accounts for about 60% of the total industrial emissions. Therefore, it is urgent to reduce the proportion of coke powder for sintering and the fuel ratio of blast furnace burden. It is well known that an effective way to reduce the proportion of coke powder for sintering and the fuel ratio of blast furnace burden is to improve the strength and reducibility of sinter.

[0003] If the sinter strength is high, the sintering temperature needs to be maintained at 1200-1400℃. In conventional sintering operation, coke powder can be added to extend the above-mentioned favorable time period, but excessive addition may cause peak temperature to be too high and calcium ferrite to be decomposed, resulting in glassy slag and regenerative hematite, which in turn reduces the strength of sinter.

[0004] In order to greatly reduce the emission of CO2 during the production of sinter, the existing technology generally uses the super sintering technology of hydrogen-based gas injection on sintering machine "Super-SINTER" (secondary fuel injection technology for the purpose of energy saving). Through research, it is found that maintaining the temperature at 1200-1400℃ can effectively control the formation of SFCA organization, and above 1200℃, SFCA will be formed; and above 1400℃, SFCA will be decomposed into glass phase silicate. In order to extend the duration above 1200℃, the traditional method is to increase the proportion of coke powder, but this will cause the material layer to overheat, the temperature to exceed 1400℃, and finally SFCA to be decomposed into glass phase silicate organization, which will reduce the strength and reducibility. The traditional method is not effective for improving the strength and reducibility of sinter. In the sintering material layer, the combustion position of gas fuel is different from that of coke powder. If the fuel point is properly controlled, the duration of temperature at 1200-1400℃ can be extended.

[0005] In actual sintering production process, a plurality of hydrogen-based gas injection hoods are arranged above the sintering trolley in the running direction of the trolley. During sintering production, the trolley runs at a certain speed towards the tail of the machine. Because the internal temperature of the sintering material reaches 1200-1400℃, which is quite different from the air temperature above the sintering material layer, there is energy loss in the upper part of the sintering material layer during the running of the trolley.

[0006] In view of this, the present application is designed by the present inventor on the basis of years of production and design experience in this field and related fields, and through repeated tests, in order to solve the problems existing in the prior art. SUMMARY

[0007] The present application aims to provide a hydrogen-based gas blowing system capable of making the heat distribution inside the sintering material layer tend to be ideal.

[0008] To achieve the above-mentioned purpose, the present application provides a hydrogen-based gas blowing system, wherein the hydrogen-based gas blowing system comprises at least one hydrogen-based gas blowing device arranged above a sintering trolley, the hydrogen-based gas blowing device comprises a blowing hood, a hydrogen-based gas blowing pipeline, a gas flow adjusting member and an X-ray imaging device, the blowing hood is arranged above the sintering trolley, one end of the hydrogen-based gas blowing pipeline extends into the blowing hood and blows hydrogen-based gas into the blowing hood, the X-ray imaging device is arranged in the blowing hood and measures the temperature inside the sintering material layer in the sintering trolley, and the gas flow adjusting member is arranged on the hydrogen-based gas blowing pipeline, and the gas flow adjusting member adjusts the hydrogen-based gas flow in the hydrogen-based gas blowing pipeline according to the temperature measured by the X-ray imaging device.

[0009] The hydrogen-based gas blowing system as described above, wherein a plurality of gas injection holes are arranged on the end of the hydrogen-based gas blowing pipeline extending into the blowing hood, and the hydrogen-based gas in the hydrogen-based gas blowing pipeline is injected to the sintering trolley through the plurality of gas injection holes.

[0010] The hydrogen-based gas blowing system as described above, wherein the other end of the hydrogen-based gas blowing pipeline penetrates through the blowing hood and extends out of the blowing hood and is connected with a hydrogen-based gas generating device.

[0011] The hydrogen-based gas blowing system as described above, wherein the gas flow adjusting member is arranged on the other end of the hydrogen-based gas blowing pipeline extending out of the blowing hood.

[0012] The hydrogen-based gas blowing system as described above, wherein the gas flow adjusting member is an electromagnetic adjusting valve.

[0013] The hydrogen-based gas blowing system as described above, wherein the bottom edge of the blowing hood is sealingly and slidably connected with the top edge of the sintering trolley.

[0014] The hydrogen-based gas blowing system as described above, wherein the hydrogen-based gas blowing device further comprises a gas concentration detector, and the gas concentration detector is arranged in the blowing hood.

[0015] The hydrogen-based gas blowing system as described above, wherein the hydrogen-based gas blowing system further comprises a control unit, and the control unit is electrically connected with the X-ray imaging device, the gas flow adjusting member and the gas concentration detector respectively.

[0016] The hydrogen-based gas blowing system as described above, wherein the hydrogen-based gas blowing system comprises a plurality of the hydrogen-based gas blowing devices, and the plurality of the blowing hoods are sequentially arranged along the running direction of the sintering pallet.

[0017] The hydrogen-based gas blowing system as described above, wherein the X-ray imaging equipment in each of the blowing hoods has a height difference.

[0018] Compared with the prior art, the hydrogen-based gas blowing system has the following characteristics and advantages:

[0019] The hydrogen-based gas blowing system measures the temperature inside the sintering material layer (a certain distance from the surface of the sintering material layer) through the X-ray imaging equipment, adjusts the flow of the hydrogen-based gas blown out by the hydrogen-based gas blowing pipeline 12 according to the temperature measurement value, so that the internal temperature (heat distribution) of the sintering material layer tends to be ideal, homogeneous sintering is achieved, the quality of the sintered ore is improved, and the production energy consumption is reduced.

[0020] The hydrogen-based gas blowing system can adjust the content of the hydrogen-based gas in the blowing hood according to the internal temperature of the sintering material layer, so as to widen the temperature band of 1200-1400℃, and ensure the homogeneous combustion of the sintering material layer. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportions of the components in the drawings are only illustrative and are used to help understand the present application, and are not specific limitations on the shapes and proportions of the components of the present application. Those skilled in the art can select various possible shapes and proportions to implement the present application according to specific circumstances under the teaching of the present application.

[0022] Figure 1 The figure is a structural schematic diagram of the hydrogen-based gas blowing device in the present application;

[0023] Figure 2 The figure is a schematic diagram of the heat distribution inside the sintering material layer in the present application.

[0024] REFERENCE NUMERALS

[0025] 10. hydrogen-based gas blowing device;

[0026] 11. blowing hood; 12. hydrogen-based gas blowing pipeline;

[0027] 13. gas flow adjusting member; 14. X-ray imaging equipment;

[0028] 15. diffusion pipeline; 200. sintering pallet;

[0029] 300. sintering machine rack. DETAILED DESCRIPTION

[0030] The details of the application can be more clearly understood in connection with the attached drawings and the following description of the application. However, the specific embodiments of the application described herein are intended for purposes of illustration only and are not intended to be limiting in any way. These and other possible variations of the application can be apparent from this teaching, and each such possible variation is deemed to fall within the scope of the present application.

[0031] As shown in Figure 1 , Figure 2 The present application provides a hydrogen-based gas blowing system, which comprises at least one hydrogen-based gas blowing device 10 arranged above a sintering pallet 200, the hydrogen-based gas blowing device 10 comprising a blowing hood 11, a hydrogen-based gas blowing pipeline 12, a gas flow adjusting member 13 and an X-ray imaging device 14, the blowing hood 11 being arranged above the sintering pallet 200, one end of the hydrogen-based gas blowing pipeline 12 extending into the blowing hood and blowing hydrogen-based gas towards the sintering pallet 200, the X-ray imaging device 14 being arranged in the blowing hood 11 and measuring the temperature inside the sintering material layer in the sintering pallet 200, and the gas flow adjusting member 13 being arranged on the hydrogen-based gas blowing pipeline 12 and adjusting the flow of hydrogen-based gas in the hydrogen-based gas blowing pipeline 12 according to the temperature measured by the X-ray imaging device 14.

[0032] The hydrogen-based gas blowing system provided by the present application measures the temperature inside the sintering material layer (a certain distance from the surface of the sintering material layer) by the X-ray imaging device 14, adjusts the flow of hydrogen-based gas blown by the hydrogen-based gas blowing pipeline 12 according to the temperature measurement value, so as to make the internal temperature (heat distribution) of the sintering material layer tend to an ideal state, realize homogeneous sintering, improve the quality of sintered ore and reduce the production energy consumption.

[0033] The hydrogen-based gas blowing system provided by the present application can adjust the content of hydrogen-based gas in the blowing hood 11 according to the internal temperature of the sintering material layer, so as to widen the temperature band of 1200-1400℃ and ensure the homogeneous combustion of the sintering material layer.

[0034] In an optional embodiment of the present application, one end of the hydrogen-based gas blowing pipeline 12 penetrates into the blowing hood 11 and is provided with a plurality of gas injection holes, and the hydrogen-based gas in the hydrogen-based gas blowing pipeline 12 is blown into the blowing hood 11 through the plurality of gas injection holes. The plurality of gas injection holes inject gas flow in multiple directions, and the concentration of hydrogen-based gas is more uniform.

[0035] In an optional example of the embodiment, the other end of the hydrogen-based gas blowing pipeline 12 penetrates the blowing hood 11 and extends out of the blowing hood 11, and the gas flow adjusting member 13 is arranged at the other end of the hydrogen-based gas blowing pipeline 12 extending out of the blowing hood 11.

[0036] In an alternative example, a through hole is formed on the spraying cover 11 according to the size of the hydrogen-based gas spraying pipe 12, the other end of the hydrogen-based gas spraying pipe 12 extends out of the spraying cover 11 through the through hole and is connected with a hydrogen-based gas generating device (not shown in the figure), and the hydrogen-based gas spraying pipe 12 is sealingly connected with the spraying cover 11.

[0037] In an alternative embodiment of the present application, the gas flow adjusting member 13 is an electromagnetic adjusting valve.

[0038] In an alternative embodiment of the present application, the bottom edge of the spraying cover 11 sealingly slides with the top edge of the sintering trolley 200.

[0039] In an alternative embodiment of the present application, the hydrogen-based gas spraying device 10 further comprises a gas concentration detector (not shown in the figure), which is arranged in the spraying cover 11.

[0040] In an alternative example of the embodiment, the hydrogen-based gas spraying system further comprises a control unit, which is electrically connected with the X-ray imaging device 14, the gas flow adjusting member 13 and the gas concentration detector. The control unit automatically adjusts the gas flow adjusting member 13 according to the temperature measured by the X-ray imaging device 14, so as to make the temperature inside the sintering material layer tend to be ideal.

[0041] In an alternative example, the control unit is provided with a control program, when the temperature measured by the X-ray imaging device 14 is lower than the temperature set value in the control program, the gas flow sprayed by the hydrogen-based gas spraying pipe 12 of the spraying cover 11 where the X-ray imaging device 14 is located will be appropriately increased; when the gas concentration detector detects that the hydrogen-based gas concentration reaches the allowable concentration in the air, the hydrogen-based gas spraying flow will not be increased.

[0042] In an alternative embodiment of the present application, the hydrogen-based gas spraying device 10 further comprises a diffusion pipe 15, one end of the diffusion pipe 15 is fixedly connected to the top of the spraying cover 11, and an opening hole is formed on the spraying cover 11 to communicate with the diffusion pipe 15.

[0043] In an alternative embodiment of the present application, the spraying cover 11 is sealingly connected with the sintering machine rack 300.

[0044] In an alternative embodiment of the present application, the hydrogen-based gas spraying system comprises a plurality of hydrogen-based gas spraying devices 10, and the plurality of hydrogen-based gas spraying devices 10 are sequentially arranged along the running direction of the sintering trolley 200.

[0045] In an alternative example of this embodiment, an X-ray imaging device 14 is installed in each injection hood 11, and the X-ray imaging devices 14 in each injection hood 11 have different heights. Each X-ray imaging device 14 is used to measure the temperature at different distances from the surface of the sintering material, so that the amount of hydrogen-based gas injected by each injection hood 11 can be adjusted according to the energy gradient configuration.

[0046] Please refer to Figure 1 The specific implementation process of the hydrogen-based gas injection system proposed by the present application will be described in detail below in combination with an embodiment.

[0047] In this example, five injection hoods 11 are installed above the sintering trolley 200, and the five injection hoods 11 are evenly distributed along the running direction of the sintering trolley 200 above the sintering trolley 200, with a spacing of 1 m between adjacent injection hoods 11. The cross section of the injection hood 11 is in the shape of a circular arc and is sealingly connected to the sintering machine rack 300. The sintering trolley 200 has a width of 4 m, a length of 1 m, and a height of 80 cm, and the cross section of the injection hood 11 has a radius of 2.1 m.

[0048] A circular hole with a diameter of 15.5 cm is formed in the upper part of the injection hood 11, and a hydrogen-based gas injection pipe 12 connected to a hydrogen-based gas generating device (not shown in the figure) is inserted into the inner wall of the injection hood 11 by about 120 cm, which can be adjusted according to the actual situation on site. A plurality of gas injection holes are formed in the end of the hydrogen-based gas injection pipe that extends into the injection hood. The hydrogen-based gas in the hydrogen-based gas injection pipe is injected towards the sintering trolley through the plurality of gas injection holes. The hydrogen-based gas injection pipe 12 has a diameter of 15 cm and is sealingly connected to the injection hood 11. A gas flow adjusting member 13 is provided on the hydrogen-based gas injection pipe 12.

[0049] An X-ray imaging device 14 is installed below each injection hood 11, and the spacing between each X-ray imaging device 14 is also 1 m, which is used to measure the temperature at different distances from the material surface. Among them, the X-ray imaging device 14 in the first injection hood 11 along the running direction of the sintering trolley measures the temperature at a vertical distance of 100 mm from the material surface, the X-ray imaging device 14 in the second injection hood 11 along the running direction of the sintering trolley measures the temperature at a vertical distance of 160 mm from the material surface, the X-ray imaging device 14 in the third injection hood 11 along the running direction of the sintering trolley measures the temperature at a vertical distance of 220 mm from the material surface, the X-ray imaging device 14 in the fourth injection hood 11 along the running direction of the sintering trolley measures the temperature at a vertical distance of 280 mm from the material surface, and the X-ray imaging device 14 in the fifth injection hood 11 along the running direction of the sintering trolley measures the temperature at a vertical distance of 340 mm from the material surface. That is, along the running direction of the sintering trolley, the measuring points (distance from the material surface) of each X-ray imaging device 14 gradually deepen.

[0050] The gas flow adjusting device 13, the X-ray imaging device 14, the gas concentration detector and the control unit are connected. In the program setting of the control unit, the ideal temperature at different distances from the material surface in the ideal state is input. According to the temperature measured by the X-ray imaging device 14, the gas flow adjusting device 13 is automatically adjusted. When the temperature measured by a certain X-ray imaging device 14 is lower than the program setting value by more than 10℃, the gas flow blown by the blowing hood 11 where the X-ray imaging device 14 is located will be appropriately increased. When the hydrogen-based gas concentration reaches the allowable concentration in the air, the gas blowing flow will no longer be increased.

[0051] The hydrogen-based gas blowing system provided by the present application is provided with a gas flow adjusting device 13 on the hydrogen-based gas blowing pipeline 12, and an X-ray imaging device 14 is installed above the sintering material layer to measure the temperature at a certain distance from the material surface. The X-ray imaging device 14, the gas flow adjusting device and the control unit are connected, and the gas flow blown by the hydrogen-based gas blowing pipeline 12 is automatically adjusted according to the temperature measured by the X-ray imaging device 14, so as to realize the homogeneous sintering of the sintering material layer and improve the strength of the sintered ore.

[0052] The detailed explanations of the above-mentioned embodiments are only for the purpose of explaining the present application, so as to better understand the present application, but these descriptions cannot be explained as the limitation of the present application for any reason, especially, the various features described in different embodiments can be arbitrarily combined with each other, so as to form other embodiments, except for the explicit opposite description, these features should be understood as being able to be applied to any one embodiment, and not limited to the described embodiments.

Claims

1. A hydrogen-based gas blowing system characterized by comprising: The hydrogen-based gas blowing system comprises at least one hydrogen-based gas blowing device arranged above the sintering trolley, wherein the hydrogen-based gas blowing device comprises a blowing hood, a hydrogen-based gas blowing pipeline, a gas flow adjusting member and an X-ray imaging device; the blowing hood is arranged above the sintering trolley; one end of the hydrogen-based gas blowing pipeline extends into the blowing hood and blows hydrogen-based gas into the blowing hood; the X-ray imaging device is arranged in the blowing hood and measures the temperature inside the sintering material layer in the sintering trolley; and the gas flow adjusting member is arranged on the hydrogen-based gas blowing pipeline and adjusts the hydrogen-based gas flow in the hydrogen-based gas blowing pipeline according to the temperature measured by the X-ray imaging device. A plurality of gas injection holes are arranged on the end of the hydrogen-based gas blowing pipeline extending into the blowing hood, and the hydrogen-based gas in the hydrogen-based gas blowing pipeline is injected to the sintering trolley through the gas injection holes. The bottom edge of the blowing hood is in sealing sliding fit with the top edge of the sintering trolley.

2. The hydrogen-based gas injection system according to claim 1, wherein The other end of the hydrogen-based gas blowing pipeline penetrates through the blowing hood, extends out of the blowing hood and is connected with a hydrogen-based gas generating device.

3. The hydrogen-based gas injection system according to claim 2, wherein The gas flow adjusting member is arranged on the other end of the hydrogen-based gas blowing pipeline extending out of the blowing hood.

4. The hydrogen-based gas injection system according to claim 1, wherein The gas flow adjusting member is an electromagnetic adjusting valve.

5. The hydrogen-based gas injection system according to Claim 1, wherein The hydrogen-based gas blowing device further comprises a gas concentration detector arranged in the blowing hood.

6. The hydrogen-based gas injection system according to claim 5, wherein The hydrogen-based gas blowing system further comprises a control unit electrically connected with the X-ray imaging device, the gas flow adjusting member and the gas concentration detector.

7. The hydrogen-based gas injection system according to claim 1, wherein The hydrogen-based gas blowing system comprises a plurality of hydrogen-based gas blowing devices, and the plurality of blowing hoods are sequentially arranged along the running direction of the sintering trolley.

8. The hydrogen-based gas injection system according to Claim 7, wherein The X-ray imaging devices in the blowing hoods have a height difference.

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