Blast furnace coal injection device
By combining the spiral auger and rotating cover design with the air intake components and the gathering structure, the problems of uneven feeding and excessive residue in traditional pulverized coal injection devices for blast furnaces have been solved, achieving uniform conveying and efficient combustion of pulverized coal, and improving the stability and economy of blast furnace smelting.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG TAIDU STEEL IND CO LTD
- Filing Date
- 2025-06-07
- Publication Date
- 2026-05-26
AI Technical Summary
Traditional pulverized coal injection devices for blast furnaces suffer from uneven feeding and excessive internal residue, resulting in low pulverized coal conveying efficiency and incomplete combustion, failing to meet the process requirements of modern blast furnaces for uniform injection and low residue.
The pulverized coal is conveyed to the dispersion hood by a spiral auger. The combination of the rotating cover and the pusher plate achieves uniform dispersion of the pulverized coal. Combined with the air chamber of the air inlet component and the inclined air blowing pipe, a uniform upward airflow is formed. With the help of the gathering structure and the circulation pipe for cooling, the pulverized coal is fed evenly and the residue is reduced.
It achieves uniform feeding and efficient injection of pulverized coal, reduces residue, improves injection efficiency, and meets the stability and economic requirements of blast furnace smelting.
Smart Images
Figure CN224280324U_ABST
Abstract
Description
Technical Field
[0001] The embodiments disclosed herein relate to the technical field of pulverized coal injection for blast furnaces, and more specifically, to a pulverized coal injection device for blast furnaces. Background Technology
[0002] In the iron and steel metallurgy industry, pulverized coal injection (PCO) in blast furnaces is a key process for reducing coke ratio and optimizing smelting costs. Its core lies in uniformly and stably injecting pulverized coal into the blast furnace to ensure combustion efficiency. However, traditional pulverized coal injection systems generally suffer from technical bottlenecks such as uneven feeding and excessive internal residue, leading to low pulverized coal conveying efficiency and incomplete combustion, severely restricting the economics and stability of blast furnace smelting.
[0003] Existing pulverized coal injection (PCI) systems suffer from significant structural defects. Firstly, the feeding structure is rudimentary, often employing a single-channel gravity feeding mode. Pulverized coal falls directly from the hopper into the injection tank. Due to the lack of dispersion and guiding components, coarse and fine coal particles segregate under gravity, with fine powder accumulating at the bottom and coarse powder suspended at the top, resulting in feed stratification. When the injection gas passes through, fine powder is preferentially blown out, leaving coarse powder behind, leading to drastic fluctuations in injection concentration. Secondly, the internal flow field design of the injection tank is unreasonable. The tank bottom is mostly a planar structure lacking guiding channels, making it easy for coal powder to accumulate in dead zones at the bottom corners during gas purging. This accumulation is particularly severe when the coal powder has high moisture content, with residual amounts reaching 15%-20% of the tank volume. Furthermore, traditional systems have a simple gas replenishment structure, with the main injection pipe only located at the center of the tank bottom. This fails to create a uniform fluidized gas curtain, causing the coal powder to swell locally within the tank, further exacerbating uneven feeding and residue problems.
[0004] As blast furnace smelting evolves towards lower energy consumption and higher pulverized coal injection ratios, traditional pulverized coal injection systems, plagued by severe feed segregation, high residue rates, and poor fluidization, can no longer meet the modern blast furnace's demands for uniform injection and low residue. For example, in high pulverized coal injection ratio smelting, uneven feeding in traditional systems leads to blast furnace temperature fluctuations and a 5%-8% increase in coke ratio. There is an urgent need to develop new pulverized coal injection systems with uniform feeding, efficient fluidization, and low residue capabilities to solve the industry problems of uneven feeding and excessive residue, and to drive the upgrading of blast furnace smelting towards higher efficiency and lower carbon emissions. Utility Model Content
[0005] To overcome the above-mentioned defects, the embodiments of this disclosure provide a blast furnace pulverized coal injection device, which solves the technical bottlenecks of uneven feeding and excessive internal residues that are common in the prior art, resulting in low coal powder conveying efficiency and incomplete combustion.
[0006] According to one aspect, at least one embodiment of the present disclosure provides a blast furnace pulverized coal injection device, comprising:
[0007] The feed hood and several base frames are fixed to the bottom of the feed hood;
[0008] The feed pipe and the feed assembly are provided, wherein the feed pipe is disposed outside the feed hood and the feed assembly is disposed inside the feed hood and the feed pipe;
[0009] An air intake assembly is disposed at the bottom of the feed hood;
[0010] The feeding assembly includes a spiral auger installed inside the feeding pipe. A dispersion hood is provided around the inside of the feeding hood. The feeding pipe is connected to the inside of the dispersion hood. The top of the dispersion hood is an open structure, and several inlets are provided around the bottom of the dispersion hood.
[0011] As a further technical solution, the top of the dispersion cover is provided with a pair of slide rails, a rotating cover is slidably connected to the slide rails, the bottom surface of the rotating cover is provided with a plurality of pusher plates, and the surface of the rotating cover is provided with a raised layer.
[0012] As a further technical solution, a drive motor is installed on the outside of the feed hood, and a drive wheel is provided at the output end of the drive motor. The lower end face of the drive wheel is in contact with the convex layer. A partition is provided on the surface of the rotating cover, and the upper end face of the partition slides in contact with the inner wall of the feed hood.
[0013] As a further technical solution, the air intake assembly includes an air chamber, which is located inside the bottom of the feed hood. An air intake pipe is provided on one side of the bottom of the feed hood, and the air intake pipe is connected to the air chamber.
[0014] As a further technical solution, a plurality of air blowing pipes are provided at the bottom of the feed hood, the air blowing pipes are connected to the air chamber, a partition is provided at the bottom of the feed hood, the partition is wrapped around the outside of the air blowing pipes, and a pair of circulation pipes are provided at the bottom of the feed hood.
[0015] As a further technical solution, the air blowing pipes are evenly distributed around the bottom of the feed hood, and the air blowing pipes are all fixed at an inclined angle.
[0016] As a further technical solution, the feed hood has a tapering structure that slopes upwards from the bottom.
[0017] As a further technical solution, both the end face of the drive wheel and the upper end face of the convex layer are high-friction anti-slip structural surfaces.
[0018] The beneficial effects of the embodiments disclosed herein are as follows:
[0019] 1. In this disclosure, the feeding assembly conveys pulverized coal to the dispersion hood via a spiral auger. The pulverized coal is initially dispersed at the bottom inlet of the dispersion hood. The drive motor drives the rotating cover to rotate on the slide rail. The pusher plate moves the pulverized coal to prevent accumulation. The partition plate divides the pulverized coal so that it is evenly distributed in the feeding hood. This solves the problem of coarse and fine powder segregation caused by single-channel gravity feeding in traditional devices, and achieves uniform pulverized coal feeding, providing a stable raw material for subsequent injection.
[0020] 2. In this disclosure, the air chamber of the air intake component collects gas and sprays it out through a uniformly distributed inclined air blowing pipe, forming an upward airflow that blows out the coal powder. The shroud protects the air blowing pipe and guides the airflow. The feed hood's converging structure makes the airflow and coal powder more concentrated. The circulation pipe can cool down and ensure stable operation of the equipment. This solves the problems of single air replenishment and unreasonable flow field in traditional devices, reduces coal powder residue, and improves the injection efficiency. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.
[0022] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure;
[0023] Figure 2 This is an isometric drawing of the present disclosure;
[0024] Figure 3 This is an isometric sectional view of the present disclosure;
[0025] Figure 4 Appendix to this disclosure Figure 3 Enlarged view of part A in the middle;
[0026] In the diagram: 1. Feed hood; 2. Base frame; 3. Feed pipe; 4. Feed assembly; 4-1. Spiral auger; 4-2. Dispersion hood; 4-3. Inlet; 4-4. Slide rail; 4-5. Rotating cover; 4-6. Pusher plate; 4-7. Raised layer; 4-8. Drive motor; 4-9. Drive wheel; 4-10. Partition; 5. Air intake assembly; 5-1. Air chamber; 5-2. Air intake pipe; 5-3. Air blowing pipe; 5-4. Partition; 5-5. Circulation pipe. Detailed Implementation
[0027] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.
[0028] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."
[0029] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.
[0030] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0031] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.
[0032] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0033] like Figures 1-4 As shown, it illustrates a blast furnace pulverized coal injection device according to an embodiment of the present disclosure, comprising:
[0034] The feed hood 1 and several base frames 2 are all fixed to the bottom of the feed hood 1;
[0035] The feed pipe 3 and the feed assembly 4 are provided. The feed pipe 3 is located outside the feed hood 1, and the feed assembly 4 is located inside the feed hood 1 and the feed pipe 3.
[0036] Air intake assembly 5, wherein the air intake assembly 5 is disposed at the bottom of the feed hood 1;
[0037] The feeding assembly 4 includes a spiral auger 4-1, which is installed inside the feeding pipe 3. A dispersion hood 4-2 is arranged around the inside of the feeding hood 1. The feeding pipe 3 is connected to the inside of the dispersion hood 4-2. The top of the dispersion hood 4-2 is open, and several inlets 4-3 are opened around the bottom of the dispersion hood 4-2. A pair of slide rails 4-4 are arranged on the top of the dispersion hood 4-2. A rotating cover 4-5 is slidably connected to the slide rails 4-4. Several pusher plates 4-6 are arranged on the bottom surface of the rotating cover 4-5. A raised layer 4-7 is arranged on the surface of the rotating cover 4-5. A drive motor 4-8 is installed outside the feeding hood 1. A drive wheel 4-9 is arranged at the output end of the drive motor 4-8. The lower end face of the drive wheel 4-9 is in contact with the raised layer 4-7. A partition 4-10 is arranged on the surface of the rotating cover 4-5. The upper end face of the partition 4-10 is slidably in contact with the inner wall of the feeding hood 1.
[0038] In some examples, a feeding assembly 4 is designed to convey and uniformly disperse materials into the feeding hood 1. This assembly uses a spiral auger 4-1 installed inside the feeding pipe 3 as its core conveying component. Driven by a motor, it rotates to convey external materials along the feeding pipe 3 into the feeding hood 1. A dispersion hood 4-2, arranged around the inside of the feeding hood 1, is connected to the feeding pipe 3. After entering the dispersion hood 4-2 through the feeding pipe 3, the material is dispersed into the feeding hood 1 through several inlets 4-3 opened around the bottom of the dispersion hood 4-2. A rotating cover 4-5 is slidably connected to a pair of slide rails 4-4 on the top of the dispersion hood 4-2. Several pusher plates 4-6 on the bottom surface of the rotating cover 4-5 can move with the rotating cover 4-5, further pushing the material entering the feeding hood 1 apart and preventing accumulation.
[0039] The drive motor 4-8 outside the feed hood 1 drives the rotating cover 4-5 to rotate on the slide rail 4-4 by the drive wheel 4-9 at the output end, which is in contact with the protrusion 4-7 on the surface of the rotating cover 4-5. The upper end face of the partition 4-10 on the surface of the rotating cover 4-5 slides against the inner wall of the feed hood 1, and can divide and move the material during rotation, so that the material is more evenly distributed in the feed hood 1.
[0040] Through the conveying of the spiral auger 4-1, the initial dispersion of the dispersion hood 4-2, the agitation of the rotating cover 4-5 and the pusher plate 4-6, and the dividing action of the partition 4-10, the feeding assembly 4 realizes the conveying of materials from the feeding pipe 3 to the feeding hood 1 and the uniform dispersion within the feeding hood 1, preparing for subsequent processes.
[0041] like Figures 1-4 As shown in the figure, the air intake assembly 5 in this embodiment includes an air chamber 5-1, which is located inside the bottom of the feed hood 1. An air intake pipe 5-2 is provided on one side of the bottom of the feed hood 1, and the air intake pipe 5-2 is connected to the air chamber 5-1. Several air blowing pipes 5-3 are provided at the bottom inside the feed hood 1, and the air blowing pipes 5-3 are connected to the air chamber 5-1. A partition 5-4 is provided at the bottom inside the feed hood 1, and the partition 5-4 covers the outside of the air blowing pipes 5-3. A pair of circulation pipes 5-5 are provided at the bottom of the feed hood 1.
[0042] In some examples, an air intake assembly 5 is designed to achieve uniform upward blowing for feeding. This assembly centers on an air chamber 5-1 located at the bottom of the feed hood 1. An air intake pipe 5-2 connects to the air chamber 5-1, allowing external air to enter the air chamber 5-1 via the air intake pipe 5-2. Several air blowing pipes 5-3 located at the bottom of the feed hood 1 are connected to the air chamber 5-1, and the gas within the air chamber 5-1 is ejected upwards through the air blowing pipes 5-3. A partition 5-4 at the bottom of the feed hood 1 surrounds the air blowing pipes 5-3, protecting them and guiding the gas to be ejected evenly.
[0043] A pair of circulation pipes 5-5 at the bottom of the feed hood 1 can be connected to an external system to circulate low-temperature water for internal cooling. Gas is evenly sprayed upward from the air blowing pipe 5-3 to form an upward airflow, which conveys the material inside the feed hood 1 upward, thus achieving the purpose of feeding.
[0044] Through the collection and distribution of gas in the gas chamber 5-1, the uniform blowing of gas through the blowing pipe 5-3, the protection and guidance of the hood 5-4, and the gas treatment of the circulation pipe 5-5, the gas inlet assembly 5 achieves uniform upward blowing, effectively conveying the material in the feed hood 1 upward, and meeting the feeding requirements of blast furnace pulverized coal.
[0045] For example, such as Figure 3 As shown, the air blowing pipes 5-3 are evenly distributed around the bottom of the feed hood 1, and the air blowing pipes 5-3 are all fixed at an inclined angle.
[0046] In some examples, by tilting the air pipe 5-3, the gas ejected from the air pipe is concentrated in one position and covers a wider area, which can effectively blow the dispersed falling material upward.
[0047] For example, such as Figure 1 As shown, the feed hood 1 has a tapering structure that slopes upwards from the bottom.
[0048] In some examples, by using a converging structure to narrow the upward path, the airflow and material are more concentrated and enter the processing equipment. Combined with a smooth, inclined surface, the material is not affected by the inner wall and can maintain a smooth upward flow, resulting in a stable discharge effect.
[0049] For example, such as Figure 4 As shown, the end face of the drive wheel 4-9 and the upper end face of the convex layer 4-7 are both high-friction anti-slip structural surfaces.
[0050] In some examples, by increasing friction, the friction between the protrusion 4-7 and the drive wheel 4-9 is increased, preventing slippage.
[0051] In actual use: the base frame 2 is fixed to the bottom of the feed hood 1, the feed pipe 3 is installed on the outside of the feed hood 1, the spiral auger 4-1 is placed inside the feed pipe 3, the dispersion hood 4-2 is set inside the feed hood 1 and connected to the feed pipe 3, the rotating cover 4-5 is installed on the top of the dispersion hood 4-2 via the slide rail 4-4, the pusher plate 4-6 is fixed to the bottom surface of the rotating cover 4-5, the drive motor 4-8 is installed outside the feed hood 1 and the drive wheel 4-9 is attached to the protrusion 4-7 of the rotating cover 4-5, and the partition plate 4-10 is set on the rotating cover 4-5. 5. On the surface, the air chamber 5-1 of the air intake assembly 5 is opened at the bottom of the feed hood 1. The air intake pipe 5-2 is connected to the air chamber 5-1. The air blowing pipe 5-3 is connected to the air chamber 5-1 and is wrapped by the shroud 5-4. The circulation pipe 5-5 is installed at the bottom of the feed hood 1. When in use, the screw conveyor 4-1 sends the coal powder into the dispersion hood 4-2. The drive motor 4-8 drives the rotating cover 4-5 to rotate. The pusher plate 4-6 and the baffle plate 4-10 evenly disperse the coal powder. The air intake pipe 5-2 supplies air through the air chamber 5-1 and sprays it out obliquely from the air blowing pipe 5-3, blowing the coal powder upward.
[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.
Claims
1. A blast furnace coal injection device characterized by comprising: include: The feed hood (1) and several base frames (2) are fixed to the bottom of the feed hood (1); The feed pipe (3) and the feed assembly (4) are provided, wherein the feed pipe (3) is disposed outside the feed hood (1) and the feed assembly (4) is disposed inside the feed hood (1) and the feed pipe (3); An air intake assembly (5) is disposed at the bottom inside the feed hood (1); The feeding assembly (4) includes a spiral auger (4-1), which is installed inside the feeding pipe (3). A dispersion hood (4-2) is provided around the inside of the feeding hood (1). The feeding pipe (3) is connected to the inside of the dispersion hood (4-2). The top of the dispersion hood (4-2) is an open structure, and several inlets (4-3) are opened around the bottom of the dispersion hood (4-2).
2. The coal injection device for blast furnace according to claim 1, characterized in that, The top of the dispersion cover (4-2) is provided with a pair of slide rails (4-4), and a rotating cover (4-5) is slidably connected on the slide rails (4-4). The bottom surface of the rotating cover (4-5) is provided with a plurality of pusher plates (4-6), and the surface of the rotating cover (4-5) is provided with a raised layer (4-7).
3. A coal injection device for a blast furnace according to claim 2, wherein A drive motor (4-8) is installed on the outside of the feed hood (1). A drive wheel (4-9) is provided at the output end of the drive motor (4-8). The lower end face of the drive wheel (4-9) is in contact with the protrusion (4-7). A partition (4-10) is provided on the surface of the rotating cover (4-5). The upper end face of the partition (4-10) is in slid contact with the inner wall of the feed hood (1).
4. The coal injection device for blast furnace according to claim 1, characterized in that, The air intake assembly (5) includes an air chamber (5-1), which is located inside the bottom of the feed hood (1). An air intake pipe (5-2) is provided on one side of the bottom of the feed hood (1), and the air intake pipe (5-2) is connected to the air chamber (5-1).
5. A coal injection device for a blast furnace according to claim 4, wherein The bottom of the feed hood (1) is provided with several air blowing pipes (5-3), which are connected to the air chamber (5-1). The bottom of the feed hood (1) is provided with a partition (5-4), which covers the outside of the air blowing pipes (5-3). The bottom of the feed hood (1) is provided with a pair of circulation pipes (5-5).
6. A coal injection device for a blast furnace according to claim 5, wherein The air blowing pipes (5-3) are evenly distributed around the bottom of the feed hood (1), and the air blowing pipes (5-3) are all fixed at an inclined angle.
7. The coal injection device for blast furnace according to claim 1, characterized in that, The feed hood (1) has a tapering structure that slopes from bottom to top.
8. The coal injection device for blast furnace according to claim 3, characterized in that, Both the end face of the drive wheel (4-9) and the upper end face of the convex layer (4-7) are high-friction anti-slip structural surfaces.