A gas-powder mixed injection device and an iron ore melting device

Abstract

The application discloses a kind of gas powder mixing injection device and iron ore melting equipment, belong to high-temperature metallurgy technical field, to solve the single function of gas powder mixing injection in prior art, air leakage, the problem of inconvenient installation.The gas powder mixing injection device of the application is used to spray gas and powder to the heating furnace of iron ore melting equipment;Gas powder mixing injection device includes injection base, gas connection, gas supply port, gas supply pipe, gas supply unit and reducing agent powder supply unit, gas distribution chamber and multiple injection channels are opened on injection base, the gas outlet end of gas supply unit and the powder outlet end of reducing agent powder supply unit are respectively connected with the gas inlet end of gas supply pipe, the gas outlet end of gas supply pipe is connected with the gas inlet end of gas supply port, gas supply port is partially or entirely inserted into gas connection and closely cooperates with gas connection, the gas outlet end of gas connection is connected with the gas inlet end of gas distribution chamber, and the gas outlet end of gas distribution chamber covers the gas inlet end of multiple injection channels.The application can be used for iron ore melting.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature metallurgical technology, and particularly relates to a gas-powder mixing and blowing device and an iron ore melting equipment. Background Technology

[0002] Iron ore smelting is a common iron ore smelting method that directly uses iron ore powder for smelting. It utilizes hydrogen to completely or partially replace coal or coke, thereby reducing carbon emissions in the steel production process.

[0003] During the iron ore smelting process, reducing gas and reducing agent need to be injected from the bottom of the melt. However, existing bottom blowing devices have problems such as limited functionality, air leakage, and inconvenient installation, resulting in a low iron ore smelting yield. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a gas-powder mixing and blowing device and an iron ore melting equipment to solve the problems of single function, air leakage and inconvenient installation in the prior art.

[0005] The objective of this invention is mainly achieved through the following technical solutions.

[0006] This invention provides a gas-powder mixing and blowing device for blowing gas and powder into the heating furnace of an iron ore melting equipment;

[0007] The air-powder mixing jetting device includes a jetting base, an air inlet, an air supply port, an air supply pipe, an air supply unit, and a reducing agent powder supply unit. The jetting base has an air distribution chamber and multiple jetting channels. The air outlet of the air supply unit and the powder outlet of the reducing agent powder supply unit are respectively connected to the air inlet of the air supply pipe. The air outlet of the air supply pipe is connected to the air inlet of the air supply port. The air supply port is partially or completely inserted into the air inlet and fits tightly with the air inlet. The air outlet of the air inlet is connected to the air inlet of the air distribution chamber. The air outlet of the air distribution chamber covers the air inlets of multiple jetting channels.

[0008] Furthermore, the gas supply unit includes an inert gas supply unit, a reducing gas supply unit, and a strengthening gas supply unit;

[0009] The outlets of the inert gas supply unit, the reducing gas supply unit, and the strengthening gas supply unit are connected to the inlet of the gas supply pipe, respectively.

[0010] Furthermore, the air supply port is an elastic component, the air inlet is a rigid component, and the outer wall dimension of the air supply port is greater than or equal to the inner wall dimension of the air inlet.

[0011] Furthermore, the outer wall of the air supply port and the inner hole of the air inlet are both truncated cone shapes.

[0012] Furthermore, the taper of the outer wall of the air supply port and the inner hole of the air inlet is 60-80°.

[0013] Furthermore, the diameter of the blowing channel is 0.2 to 2 mm, and the ratio of the center distance between two adjacent blowing channels to the diameter of the blowing channel is 2.5 to 3.5:1.

[0014] Furthermore, the inner cavity of the air distribution chamber is shaped like an inverted frustum;

[0015] From the air inlet to the air outlet of the air distribution chamber, the inner diameter of the chamber gradually increases.

[0016] Furthermore, the number of blowing channels is 25 to 36, and the blowing channels are arranged in a square pattern.

[0017] The present invention also provides an iron ore melting device, including a heating furnace and the above-mentioned gas-powder mixing and blowing device, wherein the blowing substrate is inserted into the bottom of the heating furnace and the gas outlet end of the blowing channel is connected to the inner cavity of the heating furnace.

[0018] Furthermore, the blown substrate is detachably connected to the heating furnace.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0020] A) The gas-powder mixing and blowing device provided by the present invention has a simple structure and is easy to install. It can greatly improve the efficiency of the gas-powder mixing and blowing device, reduce the cost of iron ore melting, and increase the yield of iron ore melting.

[0021] B) The gas-powder mixing and blowing device provided by the present invention is equipped with an inert gas supply unit, a reducing gas supply unit, a strengthening gas supply unit and a reducing agent powder supply unit. By adjusting the opening and closing of the above four units, various blowing parameters and the contact area with the melt can be adjusted. By adjusting the setting position of the blowing channel and the diameter of the blowing channel, the blowing position and the effective gas quantity can be adjusted, which is more conducive to adapting to different iron ore gas-based melting reactions.

[0022] C) The gas-powder mixing and blowing device provided by the present invention has the blowing base, the air distribution chamber and the air inlet as an integral component, the air supply port and the air supply pipe as an integral component, and the heating furnace and the blowing base, as well as the air supply port and the air inlet, are tightly fitted. This not only effectively improves the overall sealing performance of the gas-powder mixing and blowing device, but also enables quick installation and quick replacement.

[0023] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0024] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0025] Figure 1 A schematic diagram of the gas-powder mixing and blowing device provided in Embodiment 1 of the present invention is provided;

[0026] Figure 2 This invention provides a schematic diagram of the structure of the heating furnace in the iron ore melting equipment according to Embodiment 2;

[0027] Figure 3 for Figure 2 Enlarged view of part A;

[0028] Figure 4 A schematic diagram of the anti-leakage component in an iron ore melting device provided for the purpose of providing an embodiment of the present invention, wherein the heating furnace discharges molten iron, and the arrow indicates the direction of molten iron flow;

[0029] Figure 5 A schematic diagram of the leakage ring in an iron ore melting device provided for the purpose of providing an embodiment of the present invention.

[0030] Figure label:

[0031] 1-Leakage prevention assembly; 101-First leak prevention plug; 102-First plug cylinder; 103-Second plug cylinder; 104-Inner drain hole; 105-Outer drain hole; 2-Leakage ring; 201-Outer ring; 202-Inner ring; 203-Connecting rib; 3-Outer furnace wall; 4-Inner furnace shell; 5-Heating element; 6-Pulse injection base; 61-First base; 62-Second base; 7-Pulse injection channel; 8-Gas distribution chamber; 9-Gas inlet; 10-Mounting plate; 11-Mounting rod; 12-Gas supply port; 13-Gas supply pipe. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0033] Example 1

[0034] This embodiment provides a gas-powder mixing injection device for injecting gas and powder (e.g., inert gas, reducing gas, strengthening gas, or reducing agent, etc.) into the heating furnace of an iron ore smelting equipment. See [link to relevant documentation]. Figure 1The system includes a spray base 6, an air inlet 9, an air supply port 12, an air supply pipe 13, an air supply unit, and a reducing agent powder supply unit. The air supply unit includes an inert gas supply unit (e.g., nitrogen or argon), a reducing gas supply unit (e.g., hydrogen), and a strengthening gas supply unit (e.g., oxygen). The spray base 6 has a gas distribution chamber 8 and multiple spray channels 7. The outlets of the inert gas supply unit, the reducing gas supply unit, the strengthening gas supply unit, and the reducing agent powder supply unit are respectively connected to the inlet of the air supply pipe 13. The outlet of the air supply pipe 13 is connected to the inlet of the air supply port 12. The air supply port 12 is partially or completely inserted into the air inlet 9 and is tightly fitted with the air inlet 9. The outlet of the air inlet 9 is connected to the inlet of the gas distribution chamber 8. The outlet of the gas distribution chamber 8 covers the inlets of the multiple spray channels 7.

[0035] Compared with the prior art, the gas-powder mixing and blowing device provided in this embodiment has a simple structure and is easy to install. It can greatly improve the efficiency of the gas-powder mixing and blowing device, reduce the cost of iron ore melting, and increase the iron ore melting yield.

[0036] Specifically, on the one hand, it is equipped with an inert gas supply unit, a reducing gas supply unit, a strengthening gas supply unit, and a reducing agent powder supply unit. By adjusting the opening and closing of the above four units, various injection parameters and the contact area with the melt can be adjusted. By adjusting the setting position and diameter of the injection channel 7, the injection position and effective gas volume can be adjusted, which is more conducive to adapting to different iron ore gas-based melting reactions. On the other hand, the injection base 6, the gas distribution chamber 8, and the gas inlet 9 are integral components, and the gas supply port 12 and the gas supply pipe 13 are integral components. The heating furnace and the injection base 6, and the gas supply port 12 and the gas inlet 9 are tightly fitted, which can not only effectively improve the overall sealing of the gas-powder mixing injection device, but also realize quick installation and quick replacement.

[0037] For example, the air supply port 12 is an elastic element (e.g., a rubber tube as the air supply port 12), and the air inlet 9 is a rigid element (e.g., a metal tube as the air inlet 9). The outer wall size of the air supply port 12 is greater than or equal to the inner wall size of the air inlet 9. During the connection process between the air supply port 12 and the air inlet 9, the air supply port 12 is squeezed by the air inlet 9 to achieve a tight fit and squeeze-sealed connection between the two.

[0038] In order to further improve the sealing between the gas supply port 12 and the gas inlet port 9 and facilitate their connection, the outer wall of the gas supply port 12 and the inner hole of the gas inlet port 9 are both frustum-shaped. That is, the outer diameter of the gas supply port 12 and the inner diameter of the gas inlet port 9 gradually decrease along the direction of approaching the heating furnace. With this shape of gas supply port 12 and gas inlet port 9, the outer diameter of the upper end of the gas supply port 12 is smaller and the inner diameter of the lower end of the gas inlet port 9 is larger, so that it is easier to connect the gas supply port 12 and the gas inlet port 9.

[0039] From the perspective of smooth air supply, for example, the taper of the outer wall of the air supply port 12 and the inner hole of the air inlet 9 is 60-80°.

[0040] While ensuring the injection of reducing agent and gas, in order to prevent the melt in the heating furnace from entering the blowing channel 7, for example, the diameter of the blowing channel 7 is 0.2 to 2 mm, the ratio of the center distance between two adjacent blowing channels 7 to the diameter of the blowing channel 7 is 2.5 to 3.5 times (e.g., 3.0 times), and correspondingly, the center distance between two adjacent blowing channels 7 is 4 to 5 mm.

[0041] Considering the uniformity of the spraying, the inner cavity of the air distribution chamber 8 is shaped like an inverted frustum, that is, from the air inlet end to the air outlet end of the air distribution chamber 8, the inner diameter of the air distribution chamber 8 gradually increases. In this way, the speed of the sprayed gas entering the air distribution chamber 8 can be appropriately reduced, achieving a certain degree of buffering, thereby improving the uniformity of the spraying.

[0042] For example, the number of blowing channels 7 is 25 to 36, and the multiple blowing channels 7 are arranged in a square, that is, 5×5 or 6×6.

[0043] Example 2

[0044] This embodiment provides an iron ore melting device, including a heating furnace (see...). Figure 2 The air-powder mixing and blowing device provided in Embodiment 1 has a blowing base 6 inserted into the bottom of the heating furnace. The blowing base 6 is detachably connected to the heating furnace and fits tightly. The air outlet of the blowing channel 7 is connected to the inner cavity of the heating furnace.

[0045] Compared with the prior art, the beneficial effects of the iron ore melting equipment provided in this embodiment are basically the same as those of the gas-powder mixing and blowing device provided in Embodiment 1, and will not be described in detail here.

[0046] From an installation perspective, the upper surface of the spraying substrate 6 is flush with the upper surface of the bottom of the heating furnace, and the lower surface of the spraying substrate 6 is flush with the lower surface of the bottom of the heating furnace.

[0047] In order to enable the detachable connection between the injection substrate 6 and the heating furnace, the above-mentioned iron ore melting equipment also includes an installation plate 10 and an installation rod 11. The installation plate 10 is detachably and fixedly connected to the lower end face of the bottom of the heating furnace through the installation rod 11. The injection substrate 6 is placed on the installation plate 10. The installation plate 10 can limit the downward vertical displacement of the injection substrate 6 and support the injection substrate 6.

[0048] For example, there are multiple mounting plates 10, which are evenly arranged around the bottom of the heating furnace. One end of the mounting plate 10 is detachably connected to the bottom of the heating furnace via a mounting rod 11, and the other end is suspended and protrudes from the wall of the receiving hole, thereby forming a cantilever structure that supports the jetting base 6.

[0049] In order to limit the upward vertical displacement of the injection substrate 6, the injection substrate 6 includes a first substrate 61 and a second substrate 62 connected sequentially from top to bottom. The first substrate 61 and the second substrate 62 are integrally formed. The outer diameter of the first substrate 61 is larger than the outer diameter of the second substrate 62, thereby forming a stepped outer wall surface. A receiving hole for accommodating the injection substrate 6 is opened on the heating furnace. The hole wall is conformal to the outer wall of the injection substrate 6. Through the stepped hole wall, not only can the upward vertical displacement of the injection substrate 6 be limited, but also a multi-section sealing structure can be formed, further improving the sealing performance of the iron ore melting equipment.

[0050] Specifically, the structure of the heating furnace includes an outer furnace wall 3, an inner furnace shell 4 disposed on the inner wall of the outer furnace wall 3, and a heating element 5 (e.g., an induction coil or a heating plate) disposed between the outer furnace wall 3 and the inner furnace shell 4.

[0051] Considering that the bottom of the aforementioned heating furnace has an air inlet 9 and an air supply port 12 for installation and connection, and that the two are tightly fitted and cannot rotate relative to each other, using the existing method of molten iron discharge (i.e., tilting) would cause the air inlet 9 and air supply port 12 to loosen, affecting the overall sealing of the iron ore melting equipment. Therefore, this embodiment improves the structure of the heating furnace by adopting a bottom discharge method:

[0052] Specifically, see Figures 3 to 4 The outer furnace wall 3 is rotatable relative to the inner furnace shell 4. It should be noted that the inner furnace shell 4 is fixedly connected to the mounting surface (e.g., the ground) and mainly serves as a chamber for iron ore melting. It has a bottom wall and side walls. The outer furnace wall 3 is a rotating part, mainly designed for draining liquid, and only has a side wall. An inner drain hole 104 is opened at the bottom of the side wall of the inner furnace shell 4, and an outer drain hole 105 is opened at the bottom of the side wall of the outer furnace wall 3.

[0053] When the heating furnace melts iron ore, the inner drain hole 104 and the outer drain hole 105 are staggered and not connected. The inner cavity of the heating furnace is a closed chamber. When the heating furnace discharges molten iron, the inner drain hole 104 and the outer drain hole 105 are connected to form a drain port. The molten iron is discharged from the heating furnace through the drain port, realizing bottom discharge of molten iron.

[0054] In this way, on the one hand, during the discharge of molten iron, only the outer furnace wall 3 needs to be rotated to connect the inner drain hole 104 and the outer drain hole 105, without involving the rotation of the inner furnace shell 4, thus ensuring the stability of the connection between the gas inlet 9 and the gas supply port 12; on the other hand, by adopting the bottom discharge method, the disturbance of molten iron is reduced during the discharge process, and the molten iron is in a more stable state. The molten iron and slag will not mix, and the molten iron is discharged from the drain hole first, while the slag is always on the surface of the molten iron, thus ensuring the purity and quality of the molten iron.

[0055] In order to reduce the leakage of molten iron during the melting process, the above-mentioned heating furnace also includes a leakage prevention component 1. When the heating furnace melts iron ore, the leakage prevention component 1 seals the inner drain hole 104 to prevent molten iron from flowing out. When the heating furnace drains molten iron, the leakage prevention component 1 moves towards the outer drain hole 105, so that the inner cavity of the heating furnace is connected to the outer molten iron collection cavity through the drain port, thereby preventing molten iron from flowing out during the melting process, or flowing into the gap between the inner furnace shell 4 and the outer furnace wall 3.

[0056] Specifically, the structure of the anti-leakage component 1 includes a first anti-leakage plug 101 and a second anti-leakage plug sleeved on the outer wall of the first anti-leakage plug 101. The second anti-leakage plug includes a first plug cylinder 102 and a second plug cylinder 103 connected sequentially along a direction gradually away from the axis of the heating furnace. The diameter of the inner drain hole 104 is greater than or equal to the outer diameter of the first plug cylinder 102, which is greater than or equal to the diameter of the outer drain hole 105, which is greater than or equal to the outer diameter of the second plug cylinder 103, which is greater than or equal to the inner diameter of the second plug cylinder 103, which is greater than or equal to the outer diameter of the first anti-leakage plug 101. This makes the wall of the outer drain hole 105 protrude from the wall of the inner drain hole 104. The inner wall of the drain port is stepped, and the outer wall of the second anti-leakage plug is stepped.

[0057] It should be noted that when the heating furnace melts the iron ore, the second anti-leakage plug is located in the inner drain hole 104, and the first anti-leakage plug 101 is located in the second anti-leakage plug. The second anti-leakage plug and the first anti-leakage plug 101 seal the inner drain hole 104. At the same time, due to the setting of the outer furnace wall 3, the second anti-leakage plug and the first anti-leakage plug 101 can be effectively supported to resist the pressure of molten iron on them. Moreover, the two are cylindrical in shape and have sufficient mechanical strength, so as to effectively prevent them from deforming and ensure the tightness of the seal.

[0058] When molten iron is discharged, the outer furnace wall 3 is rotated, causing it to rotate relative to the inner furnace shell 4. The outer drain hole 105 and the inner drain hole 104 are positioned correspondingly (i.e., their axes coincide). Under the pressure of the molten iron in the heating furnace, the second anti-leakage plug and the first anti-leakage plug 101 move toward the outer drain hole 105. When the stepped surface of the second anti-leakage plug moves to the stepped surface of the inner wall of the drain hole, the wall of the outer drain hole 105 will interfere with the second anti-leakage plug. The second anti-leakage plug stops moving, and the gap between the outer furnace wall 3 and the inner furnace shell 4 is sealed. The first anti-leakage plug 101 continues to move and disengages from the second anti-leakage plug, so that the inner drain hole 104, the second anti-leakage plug, and the outer drain hole 105 are connected to form the drain port of molten iron.

[0059] From the perspective of sealing tightness, preferably, the diameter of the inner drain hole 104 is equal to the outer diameter of the first plug cylinder 102, the diameter of the outer drain hole 105 is equal to the outer diameter of the second plug cylinder 103, and the inner diameter of the first plug cylinder 102, the inner diameter of the second plug cylinder 103, and the outer diameter of the first leak-proof plug 101 are equal. In the reaction mode, the inner drain hole 104, the first plug cylinder 102, and the first leak-proof plug 101 are seamlessly fitted.

[0060] During the above-mentioned draining process, since the first anti-leakage plug 101 will detach from the second anti-leakage plug, in order to prevent it from falling into the drained molten iron, the above-mentioned heating furnace also includes a drain ring 2. The drain ring 2 is located at the end of the outer drain hole 105 away from the inner drain hole 104. The first anti-leakage plug 101 is T-shaped. When the heating furnace drains molten iron, the thickness of the protruding part of the first anti-leakage plug 101 is less than the distance between the second plug cylinder 103 and the drain ring 2.

[0061] Thus, when the first anti-leakage plug 101 continues to move to the leakage ring 2, the protruding part of the first anti-leakage plug 101 will interfere with the leakage ring 2, and the first anti-leakage plug 101 will stop moving. The inner drain hole 104, the second anti-leakage plug, the gap between the second anti-leakage plug and the first anti-leakage plug 101, the gap between the first anti-leakage plug 101 and the outer drain hole 105, and the leakage ring 2 will sequentially connect to form the drain port of molten iron. With the above structure, the leakage ring 2 axially limits the first anti-leakage plug 101, which can prevent the first anti-leakage plug 101 from falling into the drained molten iron while realizing the draining of molten iron. It should be noted that after the molten iron is drained and before the non-metallic melt flows out, the first anti-leakage plug 101 and the second anti-leakage plug are pushed into the inner drain hole 104. Then, the outer furnace wall 3 is rotated so that the inner drain hole 104 and the outer drain hole 105 are misaligned, thus completing the reset of the anti-leakage assembly 1.

[0062] For the shape of the leakage ring 2, see, for example, Figure 5It includes an outer ring 201, an inner ring 202 located in the area within the outer ring 201, and multiple connecting ribs 203 connecting the inner ring 202 and the outer ring 201. A leakage hole is formed between a portion of the inner ring 202, a portion of the outer ring 201, and two adjacent connecting ribs 203.

[0063] In order to reduce the flow resistance of molten iron, there are two connecting ribs 203. The two connecting ribs 203 are located on the same diameter of the outer ring 201. One end of the connecting rib 203 is fixedly connected to the inner ring 202, and the other end of the connecting rib 203 is connected to the outer ring 201.

[0064] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A gas-powder mixing and blowing device, characterized in that, Used for injecting gas and powder into the heating furnace of iron ore smelting equipment; The gas-powder mixing and blowing device includes a blowing base, an air inlet, an air supply port, an air supply pipe, an air supply unit, and a reducing agent powder supply unit. The blowing base has an air distribution chamber and multiple blowing channels. The air outlet of the air supply unit and the powder outlet of the reducing agent powder supply unit are respectively connected to the air inlet of the air supply pipe. The air outlet of the air supply pipe is connected to the air inlet of the air supply port. The air supply port is partially or completely inserted into the air inlet and fits tightly with the air inlet. The air outlet of the air inlet is connected to the air inlet of the air distribution chamber. The air outlet of the air distribution chamber covers the air inlets of the multiple blowing channels.

2. The gas-powder mixing and blowing device according to claim 1, characterized in that, The gas supply unit includes an inert gas supply unit, a reducing gas supply unit, and a strengthening gas supply unit; The outlets of the inert gas supply unit, the reducing gas supply unit, and the strengthening gas supply unit are respectively connected to the inlet of the gas supply pipe.

3. The gas-powder mixing and blowing device according to claim 1, characterized in that, The air supply port is an elastic element, the air inlet is a rigid element, and the outer wall dimension of the air supply port is greater than or equal to the inner wall dimension of the air inlet.

4. The gas-powder mixing and blowing device according to claim 3, characterized in that, The outer wall of the air supply port and the inner hole of the air inlet are both truncated cone shapes.

5. The gas-powder mixing and blowing device according to claim 3, characterized in that, The taper of the outer wall of the air supply port and the inner hole of the air inlet is 60-80°.

6. The gas-powder mixing and blowing device according to claim 1, characterized in that, The diameter of the blowing channel is 0.2 to 2 mm, and the ratio of the center distance between two adjacent blowing channels to the diameter of the blowing channel is 2.5 to 3.5:

1.

7. The gas-powder mixing and blowing device according to claim 1, characterized in that, The inner cavity of the air distribution chamber is shaped like an inverted frustum. From the air inlet to the air outlet of the air distribution chamber, the inner diameter of the chamber gradually increases.

8. The gas-powder mixing and blowing device according to any one of claims 1 to 7, characterized in that, The number of the blowing channels is 25 to 36, and the blowing channels are arranged in a square.

9. An iron ore melting device, characterized in that, It includes a heating furnace and an air-powder mixing and blowing device as described in any one of claims 1 to 8, wherein the blowing substrate is inserted into the bottom of the heating furnace and the air outlet of the blowing channel is connected to the inner cavity of the heating furnace.

10. The iron ore melting equipment according to claim 9, characterized in that, The sprayed substrate is detachably connected to the heating furnace.

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