Pipeline flue gas uniform distribution device for unpowered hot air sintering

Abstract

The invention provides a pipeline flue gas uniform distribution device for unpowered hot air sintering. The pipeline flue gas uniform distribution device comprises a main pipeline, a primary distribution pipe and a secondary distribution pipe, one end of the main pipeline is communicated with a hot waste gas discharge port of the circular cooler, and the other end of the main pipeline is sequentially provided with a plurality of main pipe distribution sections; the pipe diameter of each main pipe distribution section is gradually reduced in the flowing direction of flue gas in the main pipe; the adjacent main pipe distribution sections are connected through reducing pipes I, and each main pipe distribution section is connected with a primary distribution pipe; the primary distribution pipe comprises a plurality of secondary pipe distribution sections which are sequentially arranged, and the pipe diameter of each secondary pipe distribution section is gradually reduced in the flowing direction of flue gas in the primary distribution pipe; the adjacent secondary pipe distribution sections are communicated through reducing pipes II, and each secondary pipe distribution section is communicated with a hot air cover of the sintering machine through a secondary distribution pipe. According to the unpowered hot air sintering device, the problem that materials on a sintering machine trolley are heated unevenly due to the fact that the air supply amount of each branch pipe is inconsistent due to the inconsistent resistance of each air supply branch pipe of the unpowered hot air sintering device is solved.

Description

Technical Field

[0001] This invention relates to the technical field of non-powered hot air sintering equipment, specifically to a pipe flue gas uniform distribution device for non-powered hot air sintering. Background Technology

[0002] The ring cooler generates a large amount of high-temperature waste gas during the cooling of sintered ore. Delivering this waste gas to the surface of the sintering machine's material layer for hot air sintering is a primary method of utilizing the ring cooler's waste gas. Currently, based on whether a fan is used to deliver the waste gas to the sintering machine's material surface, hot air sintering devices are classified into powered and unpowered hot air sintering devices. Unpowered hot air sintering utilizes the positive pressure generated by the ring cooler's blower, the negative pressure on the trolley's material surface, and the upward force of the hot gas caused by the temperature difference to guide the high-temperature waste gas from the ring cooler through hot air ducts into the hot air hood at the rear of the sintering machine's ignition furnace, for heating the sintering mixture.

[0003] The current non-powered hot air sintering method is as follows: the main pipeline uses a constant diameter pipe to introduce hot air from the annular cooler to the height of the sintering machine trolley platform. No ash discharge pipe is installed in the horizontal section of the main pipeline. Several horizontal primary distribution pipes are drawn from the main pipeline, and the primary distribution pipes also use a constant diameter method. Several vertically downward secondary distribution pipes of equal diameter are then drawn from each primary distribution pipe. The ends of the secondary distribution pipes are connected to the sealed cover on the sintering machine trolley. The drawbacks of this non-powered hot air sintering pipeline structure are as follows: 1) The horizontal section of the main pipeline is generally long. Since the non-powered hot air sintering pipeline relies on the power provided by thermal pressure, the air velocity inside the pipeline is low, and dust is easily deposited inside the pipeline. Traditional non-powered hot air sintering pipelines do not have ash discharge pipes, so the pipeline is prone to ash accumulation. After ash accumulation, the resistance increases, and the flow rate distributed inside the pipeline will decrease; 2) The main pipeline, primary distribution pipe, and secondary distribution pipe adopt a constant diameter method at the flue gas distribution part. According to the flue gas distribution theory, the constant diameter of the pipeline cannot guarantee that the dynamic pressure drop between the two branch pipes is equal to the pressure loss between the two branch pipes. According to the law of conservation of energy, the static pressure at each branch pipe is also not equal, which cannot achieve uniform air supply. This results in uneven distribution of air volume delivered to the material surface of the trolley, uneven heating of the material on the trolley, which is not conducive to process production and reducing fuel consumption.

[0004] In summary, there is an urgent need for a duct flue gas uniform distribution device for non-powered hot air sintering to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a duct flue gas uniform distribution device for non-powered hot air sintering, aiming to solve the problem of uneven heating of materials on the sintering machine trolley due to inconsistent air supply volume caused by inconsistent resistance of each air supply branch before the hot air reaches the material before reaching the material. The specific technical solution is as follows: A duct flue gas uniform distribution device for non-powered hot air sintering includes a main duct, a primary distribution pipe, and a secondary distribution pipe. One end of the main pipeline is connected to the hot exhaust port of the annular cooler, and the other end is provided with multiple main distribution sections in sequence; along the flue gas flow direction in the main pipeline, the diameter of each main distribution section gradually decreases; adjacent main distribution sections are connected by a tapering pipe, and each main distribution section is connected to a primary distribution pipe. The primary distribution pipe includes multiple secondary distribution sections arranged sequentially. Along the flue gas flow direction in the primary distribution pipe, the diameter of each secondary distribution section gradually decreases. Adjacent secondary distribution sections are connected by a tapered tube, and each secondary distribution section is connected to the hot air hood of the sintering machine through a secondary distribution pipe.

[0006] Preferably, at least two secondary distribution pipes are spaced apart on a single secondary pipe distribution section, and the diameter of each secondary distribution pipe gradually decreases in the flue gas flow direction within the secondary pipe distribution section.

[0007] Preferably, at least two primary distribution pipes are provided at intervals on a single main distribution section, and the diameter of each primary distribution pipe gradually decreases in the flue gas flow direction in the main distribution section.

[0008] Preferably, the main pipeline is connected to the hot exhaust port of the annular cooler through an air inlet pipe. The number of air inlet pipes is the same as the number of hot exhaust ports of the annular cooler, and the air inlet pipes and the hot exhaust ports are set one-to-one.

[0009] Preferably, the horizontal section of the main pipeline is provided with multiple ash discharge pipes at intervals, and the ash discharge pipes are equipped with double-layer ash discharge valves.

[0010] Preferably, the ash discharge pipe is connected to the main electrostatic precipitator flue, and the connection and disconnection between the main pipe and the main electrostatic precipitator flue are controlled by a double-layer ash discharge valve.

[0011] Preferably, both the single main pipe distribution section and the single secondary pipe distribution section have a pipe structure with a constant flow cross-section.

[0012] Preferably, the dynamic pressure drop between two adjacent primary distribution pipes on the main pipeline is equal to the pressure loss between the two pipe openings that connect the two primary distribution pipes to the main pipeline. The dynamic pressure drop between two adjacent secondary distribution pipes on the primary distribution pipe is equal to the pressure loss between the two pipes that are connected to the primary distribution pipe.

[0013] The application of the technical solution of the present invention has the following beneficial effects: This invention, by adding a tapered pipe to the main pipeline, ensures that the dynamic pressure difference between any two primary distribution pipes on the main pipeline is equal to the pressure loss between the two branch points, thus achieving uniform flue gas distribution among the primary distribution pipes. Addressing the problem of uneven flue gas distribution within the secondary distribution pipes, this invention, based on an improved primary distribution pipeline structure (i.e., the addition of a tapered pipe), achieves uniform flue gas distribution by adjusting the cross-sectional area of ​​each secondary distribution pipe, effectively improving the uneven airflow distribution within the secondary distribution pipes.

[0014] Meanwhile, due to the low airflow velocity in the main duct of the annular cooler entering the sintering machine trolley, dust easily accumulates inside the duct. Therefore, this invention adds an ash discharge pipe to the main duct, using the suction power of the main exhaust fan to promptly remove accumulated ash from the main duct, reducing the risk of blockage and decreasing resistance within the main duct. This allows the hot air to effectively enter the sintering machine trolley surface through thermal pressure. This invention effectively introduces the hot air from the annular cooler into the sintering machine trolley surface through thermal pressure, uniformly heating the materials on the trolley surface, which is beneficial for process production and reduces fuel consumption.

[0015] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of the flue gas uniform distribution device of the present invention; Figure 2 yes Figure 1 Schematic diagram of the layout of the primary distribution pipes above the main pipeline; Figure 3 yes Figure 2 A schematic diagram of the arrangement of secondary distribution pipes on a primary distribution pipe; Among them, 1. Circular cooler, 2. Sintering machine, 3. Hot air hood, 4. Inlet pipe, 5. Main pipeline, 5.1. Main pipe distribution section, 6. Shrinking pipe one, 7. Primary distribution pipe, 7.1. Secondary pipe distribution section, 8. Secondary distribution pipe, 9. Ash discharge pipe, 10. Double-layer ash discharge valve, 11. Main electrostatic precipitator flue, 12. Shrinking pipe two. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more complete description is provided below, along with preferred embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0019] Example: See Figures 1-3 This embodiment provides a pipe flue gas uniform distribution device for non-powered hot air sintering, including a main pipe 5, a primary distribution pipe 7 and a secondary distribution pipe 8; One end of the main pipe 5 is connected to the hot exhaust port of the annular cooler, and the other end is provided with multiple main pipe distribution sections 5.1 in sequence; along the flue gas flow direction in the main pipe 5, the pipe diameter (i.e. flow cross section) of each main pipe distribution section 5.1 gradually decreases; adjacent main pipe distribution sections 5.1 are connected by a tapered pipe 6, and each main pipe distribution section 5.1 is connected to a primary distribution pipe 7. The primary distribution pipe 7 includes a plurality of secondary distribution sections 7.1 arranged sequentially. Along the flue gas flow direction in the primary distribution pipe 7, the diameter of each secondary distribution section 7.1 gradually decreases. Adjacent secondary distribution sections 7.1 are connected by a tapered pipe 12, and each secondary distribution section 7.1 is connected to the hot air hood 3 of the sintering machine 2 through a secondary distribution pipe 8.

[0020] Specifically, both the main pipe distribution section and the secondary pipe distribution section are pipe structures with a constant flow cross-section (i.e., constant diameter).

[0021] Specifically, the dynamic pressure drop between two adjacent primary distribution pipes 7 on the main pipeline 5 is equal to the pressure loss between the two pipe openings that connect the two primary distribution pipes 7 to the main pipeline 5.

[0022] Furthermore, the dynamic pressure drop between two adjacent secondary distribution pipes 8 on the primary distribution pipe 7 is equal to the pressure loss between the two pipes that are connected to the primary distribution pipe 7.

[0023] The flue gas uniform distribution device in this embodiment can achieve uniform distribution of flue gas. Taking the main pipeline as an example, the principle of achieving uniform distribution of flue gas is as follows: Assume the amount of flue gas distributed from main pipe 5 to primary distribution pipe 7 is Then the amount of flue gas The calculation formula is: (1), in, The orifice flow coefficient of the primary distribution pipe. The projected area of ​​the outlet of the primary distribution pipe in the direction perpendicular to the airflow. ; The area of ​​the outlet of the primary distribution pipe. ; For fluid density, ; The static pressure difference before and after the primary distribution pipe inlet. .

[0024] In practical engineering, the orifice flow coefficient and fluid density Generally, the flow rates are known. To ensure that the flow rates at each primary distribution nozzle are equal, it is necessary to guarantee that the flow rate in formula (1) is equal. and Equal. By Figure 2 According to the energy conservation equation, the following can be obtained for sections 1-1 and 2-2: (2), in, , The static pressures, in Pa, are for sections 1-1 and 2-2, respectively. , The dynamic pressures, in Pa, are for sections 1-1 and 2-2, respectively. This refers to the pressure loss between sections 1-1 and 2-2.

[0025] If the static pressure at each of the 7 primary distribution pipe openings is to be equal, then we can obtain the following from formula (2): (3), From formula (3), it can be seen that the condition for uniform flue gas distribution is that the dynamic pressure drop between two adjacent primary distribution pipe openings is equal to the pressure loss between two adjacent primary distribution pipe openings (here, the pipe opening refers to the opening where the primary distribution pipe connects to the main pipeline). For the main pipeline, the pressure drop between sections 1-1 and 2-2 is... The value is relatively small, while the flow rates between sections 1-1 and 2-2 differ significantly. To make the equation hold, a tapered pipe (6) is added between sections 1-1 and 2-2, reducing the pipe diameter at section 2-2 and thus increasing the flow velocity at section 2-2. The value increases. , When the difference between them decreases, formula (3) becomes valid, which satisfies the condition of uniform air supply. The pipe diameter after adding the converging tube 6 can be solved using formula (3). Similarly, the pipe diameter after adding the converging tube 12 to the primary distribution pipe can also be solved using formula (3).

[0026] like Figure 1As shown, in this embodiment, the main pipe 5 is connected to the hot exhaust port of the annular cooler through the air inlet pipe 4. Furthermore, the number of air inlet pipes 4 is the same as the number of hot exhaust ports of the annular cooler, and the air inlet pipes 4 and the hot exhaust ports are set one-to-one, that is, one hot exhaust port is connected to one air inlet pipe 4, and each air inlet pipe 4 is connected to the main pipe 5.

[0027] Preferably, the horizontal section of the main pipeline 5 is provided with multiple ash discharge pipes 9 at intervals, and the ash discharge pipes 9 are provided with double-layer ash discharge valves 10. The ash discharge pipes 9 are connected to the main electrostatic precipitator flue 11, and the connection and disconnection between the main pipeline 5 and the main electrostatic precipitator flue 11 are controlled by the double-layer ash discharge valves 10.

[0028] Preferably, the ash discharge pipe 9 is located on the side of the main pipe 5 near the air inlet pipe 4. By connecting the ash discharge pipe 9 to the main electrostatic precipitator flue 11 in the horizontal section of the main pipe, the accumulated ash in the main pipe can be removed, the main pipe can be prevented from being blocked, the resistance in the main pipe can be reduced, and the amount of hot air delivered to the trolley surface by the non-powered hot air sintering device can be increased.

[0029] Furthermore, in some embodiments, at least two secondary distribution pipes 8 may be provided at intervals on a single secondary pipe distribution section 7.1, and the diameter of each secondary distribution pipe 8 gradually decreases in the flue gas flow direction within the secondary pipe distribution section 7.1, such as... Figure 3 As shown. At this point, the cross-sectional area (i.e., flow cross-section) and orifice flow coefficient of the secondary pipe distribution section with constant diameter are... and fluid density Keeping the flow rate constant, according to the principle of energy conservation, the dynamic pressure in the pipe decreases along the airflow direction, while the static pressure increases along the airflow direction. To ensure that the outflow rate of each secondary distribution pipe 8 is equal, the cross-sectional area of ​​each secondary distribution pipe 8 can be reduced, i.e., the pipe diameter can be decreased. > > > (in (This refers to the 8th pipe diameter). Although the static pressure increases along the airflow direction, the cross-sectional area of ​​each secondary distribution pipe 8 decreases, which ensures that the flow rate distributed by each secondary distribution pipe is uniform. The cross-sectional area of ​​each secondary distribution pipe 8 can be calculated using formula (1).

[0030] Similarly, in some embodiments, at least two primary distribution pipes 7 may be provided at intervals on a single main distribution section 5.1, and the diameter of each primary distribution pipe 7 gradually decreases in the flue gas flow direction in the main distribution section 5.1.

[0031] It should be noted that, Figures 1-3 In , , ... This indicates the numbering of different pipe diameters, in this embodiment... , , ... The pipe diameter decreases sequentially. In this embodiment, the gradual decrease in pipe diameter along the flue gas flow direction means that the pipe diameter upstream of the flue gas flow direction is larger than the pipe diameter downstream.

[0032] Preferably, in this embodiment, the main pipe 5, the primary distribution pipe 7, and the secondary distribution pipe 8 are an integrated structure.

[0033] In this embodiment, by setting an ash discharge pipe 9 in the horizontal section of the main pipeline and connecting it to the main electrostatic precipitator flue 11, it is possible to remove the accumulated ash in the main pipeline, prevent the main pipeline from being blocked, reduce the resistance in the main pipeline, and increase the amount of hot air delivered to the trolley surface by the non-powered hot air sintering device.

[0034] This embodiment ensures equal static pressure at each distribution outlet by adding a first tapered pipe and a second tapered pipe to the main pipe and the primary distribution pipe, respectively, thereby effectively achieving uniform air supply in the main pipe and the primary distribution pipe.

[0035] In this embodiment, when multiple primary distribution pipes are set on the main pipe distribution section and multiple secondary distribution pipes are set on the secondary pipe distribution section, the cross-sections of the primary and secondary distribution pipes are gradually reduced along the flue gas flow direction to ensure that the outflow rate of each distribution outlet is equal, thus effectively achieving uniform air supply.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pipe flue gas uniform distribution device for non-powered hot air sintering, characterized in that, It includes the main pipe (5), the primary distribution pipe (7), and the secondary distribution pipe (8); One end of the main pipe (5) is connected to the hot exhaust port of the annular cooler, and the other end is provided with multiple main pipe distribution sections (5.1) in sequence; along the flue gas flow direction in the main pipe (5), the diameter of each main pipe distribution section (5.1) gradually decreases; adjacent main pipe distribution sections (5.1) are connected by a tapered pipe (6), and each main pipe distribution section (5.1) is connected to a primary distribution pipe (7). The primary distribution pipe (7) includes a plurality of secondary distribution sections (7.1) arranged in sequence. Along the flue gas flow direction in the primary distribution pipe (7), the diameter of each secondary distribution section (7.1) gradually decreases. Adjacent secondary distribution sections (7.1) are connected by a tapered pipe (12), and each secondary distribution section (7.1) is connected to the hot air hood (3) of the sintering machine (2) through a secondary distribution pipe (8).

2. The pipe flue gas uniform distribution device for non-powered hot air sintering according to claim 1, characterized in that, At least two secondary distribution pipes (8) are provided at intervals on the secondary pipe distribution section (7.1) of the single section, and the diameter of each secondary distribution pipe (8) gradually decreases in the flue gas flow direction in the secondary pipe distribution section (7.1).

3. The pipe flue gas uniform distribution device for non-powered hot air sintering according to claim 1, characterized in that, At least two primary distribution pipes (7) are provided at intervals on the main distribution section (5.1) of the single section, and the diameter of each primary distribution pipe (7) gradually decreases in the flue gas flow direction in the main distribution section (5.1).

4. The pipe flue gas uniform distribution device for non-powered hot air sintering according to claim 1, characterized in that, The main pipe (5) is connected to the hot exhaust port of the ring cooler through the air inlet pipe (4). The number of air inlet pipes (4) is the same as the number of hot exhaust ports of the ring cooler, and the air inlet pipes (4) and the hot exhaust ports are set one-to-one.

5. The pipe flue gas uniform distribution device for non-powered hot air sintering according to claim 4, characterized in that, The horizontal section of the main pipeline (5) is provided with multiple ash discharge pipes (9) at intervals, and the ash discharge pipes (9) are provided with double-layer ash discharge valves (10).

6. The pipe flue gas uniform distribution device for non-powered hot air sintering according to claim 5, characterized in that, The ash discharge pipe (9) is connected to the main electrostatic precipitator flue (11), and the connection and disconnection between the main pipe (5) and the main electrostatic precipitator flue (11) are controlled by the double-layer ash discharge valve (10).

7. The pipe flue gas uniform distribution device for non-powered hot air sintering according to claim 1, characterized in that, Both the single main pipe distribution section (5.1) and the single secondary pipe distribution section (7.1) are pipe structures with a constant flow cross-section.

8. The pipe flue gas uniform distribution device for non-powered hot air sintering according to claim 1, characterized in that, The following conditions must be met between two adjacent primary distribution pipes (7) on the main pipeline (5): the dynamic pressure drop between the two primary distribution pipes (7) connected to the main pipeline (5) is equal to the pressure loss between the two pipes; The following condition must be met between two adjacent secondary distribution pipes (8) on the primary distribution pipe (7): the dynamic pressure drop between the two secondary distribution pipes (8) connected to the primary distribution pipe (7) is equal to the pressure loss between the two pipes.

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