Bottom discharge fluidizer of injection tank

Abstract

The utility model discloses a blowing tank bottom discharging fluidizer which comprises a fluidizer body, and a flange assembly is arranged on the top of the fluidizer body. An injection pipe and a fluidizing pipe are correspondingly arranged on the side walls, in different directions, of the fluidizer main body, and are used for introducing fluidizing gas into the injection tank and assisting the injection pipe in expanding the action range of the fluidizing gas. The utility model relates to the technical field of key equipment of a blast furnace coal injection system in the metallurgical industry, in particular to a bottom discharge fluidizer of an injection tank, which has the advantages that: 1, the coal injection quantity is continuous and uniform, and the concentration is obviously improved; wall hanging and spontaneous combustion are completely eradicated, and the safety performance is upgraded; and thirdly, suspended material arching is broken and removed, and production continuity is guaranteed.

Description

Technical Field

[0001] This utility model relates to the technical field of key equipment for blast furnace pulverized coal injection systems in the metallurgical industry, and in particular to a fluidizer for the discharge of pulverized coal from a pulverized coal injection tank. Background Technology

[0002] In the pulverized coal injection system of blast furnaces in steel plants of the metallurgical industry, the injection tank, as the core equipment for storing and conveying pulverized coal, directly affects the efficiency and safety of blast furnace ironmaking. Currently, the injection tank generally faces the following technical challenges in the process of pulverized coal storage and output:

[0003] 1. Fluctuations in pulverized coal injection rate and unstable concentration: The airflow distribution of traditional fluidization devices is uneven, and the pulverized coal fluidization effect is poor. As a result, it is difficult to maintain uniformity and stability when the pulverized coal is output from the injection tank. The concentration of injected pulverized coal fluctuates greatly, which in turn affects the efficiency of the blast furnace pulverized coal injection system and fails to meet the demand of blast furnace ironmaking for a continuous and stable supply of pulverized coal.

[0004] 2. Risk of coal powder adhering to the wall and spontaneous combustion due to coal powder accumulation: When coal powder is stationary or does not flow smoothly in the tank, it is easy to adhere to the inner wall of the tank and form a "wax" phenomenon. As the coal powder accumulates, the internal heat may accumulate and cause spontaneous combustion, which poses a significant safety hazard.

[0005] 3. Suspended material arching and conveying blockage: During the storage and conveying process, coal powder is prone to forming a suspended material arching structure due to the friction between particles and the effect of static electricity. This causes the coal powder to be unable to fall smoothly, resulting in blockage of the discharge port of the injection tank and interruption of the production process.

[0006] In existing technologies, fluidization devices mostly employ a single airflow input or a combination of dispersive components, lacking a systematic design for pulverized coal fluidization, conveying paths, and anti-wall-hanging structures, making it difficult to simultaneously solve the aforementioned multiple problems. Therefore, there is an urgent need for a high-efficiency fluidizer capable of achieving continuous and uniform pulverized coal output and preventing wall-hanging, spontaneous combustion, and blockage. Utility Model Content

[0007] In view of this, the present invention aims to provide a novel lifting car repair reclining platform to solve or alleviate the technical problems existing in the prior art, or at least provide a beneficial alternative.

[0008] The technical solution of this utility model embodiment is implemented as follows:

[0009] A fluidizer with bottom discharge from a blower tank includes a fluidizer body, and a flange assembly is provided on the top of the fluidizer body. The flange assembly is a national standard flange of DN600 PN16, and the bolt holes on the flange are arranged in a grid pattern.

[0010] The fluidizer body has ejector tubes and fluidizing tubes on its side walls in different directions. The ejector tube has a diameter of DN15 and a nominal pressure of PN16 and is used to introduce fluidizing gas into the injection tank. The fluidizing tube has a diameter of DN25 and a nominal pressure of PN16 and is used to assist the ejector tube in expanding the range of action of the fluidizing gas.

[0011] The fluidizer body is equipped with a filter screen at the top. The filter screen has a fineness of 40μm and is made of 316 stainless steel. The center of the filter screen is open and connected to the coal outlet pipe. The ejector pipe is connected to the coal outlet pipe. The fluidizer body is equipped with a drain port at the bottom and a threaded manual ball valve is installed on the drain port.

[0012] Preferably, the connection position between the ejector tube and the side wall of the fluidizer body is higher than that of the fluidizing tube, forming a staggered airflow input structure to enhance the fluidization effect of pulverized coal in the tank.

[0013] Preferably, the bending direction of the coal outlet pipe is consistent with the inclination direction of the bottom outlet of the injection tank, so that the fluidized coal powder can be smoothly discharged under the impetus of gravity and airflow.

[0014] Preferably, the opening diameter of the filter screen matches the inner diameter of the coal outlet pipe, and the opening edge is provided with a guide slope to guide the coal powder to gather in the direction of the coal outlet pipe.

[0015] Preferably, the flange assembly has several sets of bolt holes, and the center-to-center distance between adjacent bolt holes is equal to ensure uniform stress on the flange connection.

[0016] Preferably, the coal outlet pipe is curved and extends outward through the side wall of the fluidizer body, with a radius of curvature R≥250, for discharging fluidized coal powder.

[0017] Preferably, the flange assembly is equipped with a sealing gasket and mounting bolts. The flange is fixed to the bottom outlet of the injection tank by the bolts, and the sealing gasket fills the flange connection to ensure the sealing of the connection with the bottom of the injection tank.

[0018] The present invention has the following advantages due to the adoption of the above technical solution:

[0019] 1. The pulverized coal injection rate is continuous and uniform, and the concentration is significantly increased.

[0020] With the coordinated airflow input of the ejector and fluidizing pipe, the pulverized coal forms a stable fluidized state in the tank, and the uniformity of the output is greatly improved. The concentration of pulverized coal injected is increased by 15%-20% compared with traditional equipment, ensuring the stable efficiency of the blast furnace pulverized coal injection system and providing a continuous supply of pulverized coal for the normal operation of the blast furnace.

[0021] II. Eliminating wall-mounted debris and spontaneous combustion, enhancing safety performance.

[0022] The three-dimensional flow field design eliminates the opportunity for coal powder to remain stationary and adhere, preventing the "waxing" phenomenon from the source; the airflow drives the coal powder to flow continuously, avoiding the accumulation of powder and the generation of heat, and the corrosion-resistant filter screen reduces the retention of impurities, significantly reducing the risk of spontaneous combustion and meeting the high safety standards of the metallurgical industry.

[0023] 3. Eliminate arching of suspended materials to ensure production continuity.

[0024] The large curvature radius and guide slope design of the coal outlet pipe, combined with the lifting effect of the bottom fluidized airflow, effectively breaks the arch bridge structure formed during the storage and transportation of pulverized coal, allowing the pulverized coal to fall and be discharged smoothly, preventing production interruptions caused by blockages and improving the reliability of the pulverized coal injection system.

[0025] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a structural diagram of the present invention;

[0028] Figure 2 This is a structural diagram of the ejector tube and fluidizing tube of this utility model;

[0029] Figure 3 This is a cross-sectional structural diagram of the fluidizer body of this utility model;

[0030] Figure 4 This is a cross-sectional view of the fluidizer body of this utility model from another perspective.

[0031] Figure 5 This is a structural diagram of the filter screen, sealing gasket, and bolt holes of this utility model;

[0032] Figure 6 This is a top view of the ejector tube, fluidizing tube, and coal outlet tube of this utility model.

[0033] Reference numerals in the attached drawings: 1. Fluidizer body; 2. Flange assembly; 3. Ejector tube; 4. Fluidizing tube; 5. Filter screen; 6. Coal outlet pipe; 7. Sealing gasket; 8. Mounting bolt; 9. Bolt hole; 10. Drain outlet; 11. Threaded manual ball valve. Detailed Implementation

[0034] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0035] It is important to note that terms such as "first," "second," "symmetric," and "array" are used only to distinguish between descriptive and positional descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified with terms such as "first" or "symmetric" may explicitly or implicitly include one or more of that feature; similarly, when the quantity of certain features is not limited by words such as "two" or "three," it should be noted that such features also explicitly or implicitly include one or more features.

[0036] In this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "fixation" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, a direct connection, a welding connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the accompanying drawings and specific circumstances.

[0037] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0038] like Figure 1-6 The present invention provides a fluidizer for bottom discharge of a blower, including a fluidizer body 1, a flange assembly 2 on the top of the fluidizer body 1, the flange assembly 2 being a national standard flange of DN600 PN16, and the bolt holes 9 on the flange being arranged in a grid pattern.

[0039] The fluidizer body 1 has ejector tube 3 and fluidizing tube 4 on its side walls in different directions. The ejector tube 3 has a diameter of DN15 and a nominal pressure of PN16 and is used to introduce fluidizing gas into the injection tank. The fluidizing tube 4 has a diameter of DN25 and a nominal pressure of PN16 and is used to assist the ejector tube 3 in expanding the range of action of the fluidizing gas.

[0040] The fluidizer body 1 is equipped with a filter screen 5 at the top. The filter screen 5 has a fineness of 40μm and is made of 316 stainless steel. The center of the filter screen 5 is open and connected to the coal outlet pipe 6. The ejector pipe (3) is connected to the coal outlet pipe (6). The fluidizer body (1) is equipped with a drain port (10) at the bottom. A threaded manual ball valve (11) is installed on the drain port (10).

[0041] In this embodiment, specifically, the connection position between the ejector tube 3 and the side wall of the fluidizer body 1 is higher than that of the fluidizing tube 4, forming an upper and lower staggered airflow input structure to enhance the fluidization effect of pulverized coal in the tank. The bending direction of the coal outlet pipe 6 is consistent with the tilting direction of the bottom outlet of the injection tank, so that the fluidized pulverized coal can be smoothly discharged under the push of gravity and airflow.

[0042] In this embodiment, specifically, the opening diameter of the filter screen 5 matches the inner diameter of the coal outlet pipe 6, and a guide slope is provided at the edge of the opening to guide the coal powder to gather in the direction of the coal outlet pipe 6. The flange assembly 2 has several sets of bolt holes 9, and the center distance between adjacent bolt holes 9 is equal to ensure uniform force on the flange connection.

[0043] In this embodiment, specifically, the coal outlet pipe 6 is curved and extends outward through the side wall of the fluidizer body 1, with a radius of curvature R≥250, for discharging fluidized coal powder. The flange assembly 2 is equipped with a sealing gasket 7 and mounting bolts 8. The flange is fixed to the bottom outlet of the injection tank by the mounting bolts 8. The sealing gasket 7 fills the flange connection to ensure the sealing of the connection with the bottom of the injection tank.

[0044] When this utility model is in operation:

[0045] (I) Installation Steps

[0046] 1. Flange connection

[0047] Align the flange assembly 2 at the top of the fluidizer body 1 with the discharge flange at the bottom of the injection tank, ensuring that the eight bolt holes 9 on the flange assembly 2 precisely correspond to the bolt holes on the injection tank flange. Install a sealing gasket 7 at the flange connection, and then use the matching mounting bolts 8 to pass through the bolt holes 9, tightening them gradually in a diagonal and even manner to ensure that the flange assembly 2 fits tightly against the bottom of the injection tank, and that the sealing gasket 7 completely fills the connection gap to prevent gas leakage.

[0048] 2. Gas line and pipeline connection

[0049] The ejector tube 3 and the fluidizing tube 4 are connected to an external air source (such as a compressed air station) via high-pressure hoses or steel pipes. The pipe interfaces use sealing threads or flanges that match the ejector tube 3 (DN15) and the fluidizing tube 4 (DN25) to ensure the sealing and stability of the airflow path.

[0050] One end of the coal outlet pipe 6 is connected to the center opening of the filter screen 5 at the top of the fluidizer body 1, and the other end is connected to the coal conveying pipe of the pulverized coal injection system. When connecting, it is necessary to ensure that the bending direction of the coal outlet pipe 6 is consistent with the tilting direction of the bottom outlet of the injection tank, so as to use gravity to assist the conveying of pulverized coal.

[0051] Filter installation

[0052] The filter screen 5 is fixed to the mounting groove on the top of the fluidizer body 1 by clips or bolts, ensuring that the center opening of the filter screen 5 is completely aligned with the inlet of the coal outlet pipe 6. The guide slope at the edge of the opening should face the inside of the coal outlet pipe 6 to form a smooth coal powder guide channel, guiding the fluidized coal powder to gather towards the coal outlet pipe 6.

[0053] (II) Working Principle

[0054] 1. Airflow input and pulverized coal fluidization

[0055] An external gas source introduces fluidizing gas (such as nitrogen or compressed air) into the injection tank through ejector pipe 3 and fluidizing pipe 4. Because ejector pipe 3 is connected higher than fluidizing pipe 4, a staggered airflow input structure is formed: high-speed airflow from ejector pipe 3 sprays upwards, breaking up the agglomeration of the upper layer of pulverized coal in the tank; low-speed airflow from fluidizing pipe 4 diffuses outwards, supporting the lower layer of pulverized coal to form a fluidized bed. The two airflows intersect within the tank, creating a three-dimensional flow field that ensures the pulverized coal is uniformly suspended in the gas, maintaining a good fluidized state and preventing it from adhering to the tank wall to form "wax" or accumulating and spontaneously combusting.

[0056] 2. Pulverized coal filtration and conveying

[0057] Fluidized pulverized coal rises with the airflow to the top of the fluidizer body 1. After passing through the filter screen 5 (40μm precision, 316 stainless steel) to intercept impurity particles in the gas, it enters the coal outlet pipe 6 through the central opening. The curved structure of the coal outlet pipe 6 (radius of curvature R≥250) is consistent with the inclination direction of the bottom of the injection tank. Under the combined action of gravity and airflow propulsion, the pulverized coal is smoothly discharged along the pipe to the subsequent pulverized coal injection system, achieving continuous and uniform pulverized coal transportation.

[0058] (III) Maintenance Points

[0059] 1. Sealing inspection

[0060] Regularly (weekly recommended) check the tightness of the mounting bolts 8 of flange assembly 2. If any are found to be loose, retighten them in a diagonal sequence. If the gasket 7 leaks due to aging or wear, replace it with a gasket of the same specification in a timely manner to ensure the high airtightness of the flange connection.

[0061] 2. Filter maintenance

[0062] Disassemble filter screen 5 monthly and rinse the surface with compressed air or clean water to remove impurities. If filter screen 5 is found to be damaged or the mesh is severely clogged, replace it with a new 316 stainless steel filter screen to ensure the impurity interception effect and avoid clogging the flow channel.

[0063] 3. Coal outlet pipe inspection

[0064] Regularly observe the wear condition of the inner wall of the coal outlet pipe 6. If obvious dents or thinning of the wall thickness appear, timely welding or replacement of the coal outlet pipe 6 of the same specification (with the radius of curvature maintained at R≥250) is required to ensure the smoothness of the coal powder conveying path.

[0065] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A fluidizer for bottom discharge from a blower tank, comprising a fluidizer body (1), characterized in that, The fluidizer body (1) is provided with a flange assembly (2) at the top; The fluidizer body (1) has ejector tubes (3) and fluidizing tubes (4) on its side walls in different directions. The ejector tubes (3) are used to introduce fluidizing gas into the injection tank, and the fluidizing tubes (4) are used to assist the ejector tubes (3) in expanding the range of action of the fluidizing gas. The fluidizer body (1) is provided with a filter screen (5) at the top. The filter screen (5) is open at the center and a coal outlet pipe (6) is connected to the opening. The ejector pipe (3) is connected to the coal outlet pipe (6). The fluidizer body (1) is provided with a drain outlet (10) at the bottom and a threaded manual ball valve (11) is installed on the drain outlet (10).

2. The fluidizer for bottom discharge from a blower tank according to claim 1, characterized in that: The connection position of the ejector tube (3) to the side wall of the fluidizer body (1) is higher than that of the fluidizing tube (4), forming an upper and lower staggered airflow input structure to enhance the fluidization effect of pulverized coal in the tank.

3. The fluidizer for bottom discharge from a blower tank according to claim 1, characterized in that: The bending direction of the coal outlet pipe (6) is consistent with the tilting direction of the bottom outlet of the injection tank, so that the fluidized coal powder can be smoothly discharged under the force of gravity and airflow.

4. The fluidizer for bottom discharge from a blower tank according to claim 1, characterized in that: The opening diameter of the filter screen (5) matches the inner diameter of the coal outlet pipe (6), and the opening edge is provided with a guide slope to guide the coal powder to gather in the direction of the coal outlet pipe (6).

5. A fluidizer for bottom discharge from a blower tank according to claim 1, characterized in that: The flange assembly (2) has several sets of bolt holes (9), and the center distance between adjacent bolt holes (9) is equal to ensure uniform force distribution in the flange connection.

6. A fluidizer for bottom discharge from a blower tank according to claim 1, characterized in that: The coal outlet pipe (6) is curved and extends outward through the side wall of the fluidizer body (1), with a radius of curvature R≥250, and is used to discharge fluidized coal powder.

7. A fluidizer for bottom discharge from a blower tank according to claim 1, characterized in that: The flange assembly (2) is equipped with a sealing gasket (7) and mounting bolts (8). The flange is fixed to the bottom outlet of the spray tank by the mounting bolts (8). The sealing gasket (7) fills the flange connection to ensure the sealing of the connection with the bottom of the spray tank.

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