Coal wind external burner

Abstract

The utility model provides a kind of coal wind external combustion device. Pulverized coal pipeline, axial flow air pipe, cyclone air pipe and oil gun pipeline left end flush, and concentrically set, and left end is outlet end. The left end of pulverized coal pipeline passage can be used for being cast fixed. Further, ignition device is set in oil gun pipeline. Further, the setting of the outermost side of pulverized coal pipeline can make pulverized coal pipeline contact high-temperature secondary air, so that pulverized coal can be quickly heated, so that the burning speed of pulverized coal is faster, combustion is more sufficient, and combustion efficiency is improved. Oil gun pipeline has certain activity space relative to the axial direction of cyclone air pipe, and the setting of expansion joint can ensure the sealing connection of oil gun pipeline and cyclone air pipe while making both avoid the situation that stress damage occurs at the connection due to excessive internal pressure, so as to ensure the air tightness of the device.

Description

Technical Field

[0001] This utility model relates to the field of cement burner technology, and in particular to an external coal-air burner. Background Technology

[0002] In existing technologies, coal-air burners are widely used in pulverized coal combustion systems, and their structure typically includes components such as pulverized coal pipes, axial flow pipes, swirl flow pipes, and oil gun pipes. However, traditional burner designs have the following problems: Low coal powder preheating efficiency: In traditional designs, coal powder pipelines are mostly located inside the burner or in areas that are not in direct contact with high temperatures, resulting in insufficient preheating of coal powder before it enters the combustion zone, slow combustion start-up speed, and impact on combustion efficiency and system response performance.

[0003] The connection between the oil gun pipe and the swirl fan pipe is prone to damage: The oil gun pipe and the swirl fan pipe are usually connected by rigidity or fixed sealing. Under the influence of internal pressure fluctuations or thermal expansion, stress concentration is easily generated at the connection, which can lead to seal failure or structural damage, affecting airtightness and operational safety.

[0004] Inconvenient installation and maintenance: Traditional burners often do not use a flush and concentric design at the outlet ends of each pipe, which makes it difficult to center during casting and fixing, requires high installation accuracy, and is not conducive to later maintenance and replacement.

[0005] Low integration of ignition devices: Ignition devices are often independently arranged outside the burner or are non-integrated designs, which increases structural complexity and may affect ignition efficiency and stability.

[0006] Therefore, there is an urgent need for a new type of burner structure that can optimize pulverized coal preheating efficiency, enhance pipeline connection reliability, simplify installation process, and improve ignition stability. Utility Model Content

[0007] In view of the above problems, this utility model is proposed to provide a coal-air external burner that overcomes or at least partially solves the above problems, and can solve the problem of slow coal powder combustion speed and low efficiency of existing burners, thereby improving the combustion efficiency and combustion speed of coal powder.

[0008] Specifically, this utility model provides an external coal-air burner, which includes: Burner bracket; A pulverized coal pipeline is fixedly mounted on the burner support; the pulverized coal pipeline is provided with a pulverized coal inlet pipe for introducing pulverized coal. An axial flow duct is inserted into the pulverized coal pipe; the axial flow duct is sealed to the right end of the pulverized coal pipe, and the right end of the axial flow duct extends to the right out of the pulverized coal pipe; an axial flow air connector is provided at the part of the axial flow duct extending out of the pulverized coal pipe. A swirl air duct is inserted into an axial air duct; the right end of the swirl air duct is sealed to the right end of the axial air duct, and the right end of the swirl air duct extends to the right out of the axial air duct; a swirl air connector is provided on the part of the swirl air duct that extends outward from the axial air duct. The oil gun pipe is inserted into the swirl fan pipe; a swirl fan adjusting expansion joint is connected between the right end of the oil gun pipe and the swirl fan pipe; the swirl fan adjusting expansion joint is a retractable corrugated pipe structure.

[0009] Optionally, the swirl fan duct and the axial fan duct form an axial fan channel; the left end of the swirl fan duct has a flared structure so that the outlet width of the axial fan channel gradually decreases to the left; the oil gun duct and the swirl fan duct form a swirl fan channel; the outer peripheral wall of the left end of the oil gun duct gradually thickens to the left so that the outlet width of the swirl fan channel to the left is less than or equal to the width on the right.

[0010] Optionally, the outlet of the axial flow air channel is provided with an axial flow air nozzle, and the axial flow air nozzle has multiple axial flow air nozzles evenly distributed in the circumferential direction.

[0011] Optionally, the outlet of the swirling air channel is provided with a swirling air nozzle, and the swirling air nozzle has multiple central air nozzles and swirling air nozzles evenly distributed around its circumference, with the swirling air nozzles located outside the central air nozzles.

[0012] Optionally, a thermal expansion adjustment mechanism is connected between the right extension of the axial flow duct and the right end of the pulverized coal duct; the thermal expansion adjustment mechanism is used to limit the axial flow duct to move only a preset distance to the right relative to the pulverized coal duct.

[0013] Optionally, a swirl valve is provided on the swirl air pipe; an axial air valve is provided on the axial air pipe.

[0014] Optionally, a deceleration chamber is provided at the connection between the pulverized coal inlet pipe and the pulverized coal pipe; the inner diameter of the deceleration chamber is larger than the diameter of the pulverized coal inlet pipe.

[0015] Optionally, the pulverized coal pipeline, the axial flow air pipeline, the swirl air pipeline, and the oil gun pipeline are all composed of a first part of the pipeline and a second part of the pipeline, and the first part of the pipeline and the second part of the pipeline are connected by a keyway for sealing and sliding connection.

[0016] Optionally, the first section of the pulverized coal pipeline and the axial flow air pipeline are fixedly connected by a connecting key, and the pulverized coal pipeline and the axial flow air pipeline constitute a pulverized coal channel.

[0017] Optionally, the inlet ends of the swirl air pipe and the axial air pipe are both connected to a clean air duct.

[0018] In this utility model of an external coal-air burner, the left ends of the pulverized coal pipe, axial flow air pipe, swirl air pipe, and oil gun pipe are flush and concentrically arranged, with the left end serving as the outlet. The left end of the pulverized coal pipe channel can be fixed by casting. Furthermore, the ignition device is located inside the oil gun pipe. Furthermore, the outermost arrangement of the pulverized coal pipe allows it to come into contact with high-temperature secondary air, thereby rapidly heating the pulverized coal, resulting in faster and more complete combustion, and improved combustion efficiency.

[0019] Furthermore, the oil gun pipe has a certain amount of axial movement relative to the swirl air pipe. The expansion joint can ensure a sealed connection between the oil gun pipe and the swirl air pipe, while preventing stress damage at the connection due to excessive internal pressure, thus ensuring the airtightness of the device.

[0020] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0021] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic structural diagram of an external coal-air burner according to an embodiment of the present invention; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic side view of an external coal-air burner according to an embodiment of the present invention.

[0022] In the diagram: 100, burner support; 200, pulverized coal pipe; 210, pulverized coal inlet pipe; 211, deceleration chamber; 220, pulverized coal channel; 230, connecting key; 300, axial flow air pipe; 310, axial flow air connector; 320, axial flow air channel; 330, axial flow air nozzle; 331, axial flow air nozzle hole; 340, thermal expansion adjustment mechanism; 350, axial flow air valve; 400, swirl air pipe; 410, swirl air connector; 420, swirl air channel; 430, swirl air nozzle; 431, swirl air nozzle hole; 432, center air nozzle hole; 440, expansion joint; 450, swirl air valve; 500, oil gun pipe. Detailed Implementation

[0023] The following reference Figures 1 to 3 This description pertains to an external coal-fired burner according to an embodiment of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0024] Unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct 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, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being 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," or "below" of the second feature can mean the first feature is 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.

[0026] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] Figure 1 This is a schematic structural diagram of an external coal-fired burner, such as... Figure 1 As shown, and with reference Figures 2 to 3 This utility model embodiment provides a coal-air external burner, which includes a burner support 100, a pulverized coal pipe 200, an axial flow air pipe 300, a swirl air pipe 400, and an oil gun pipe 500. The pulverized coal pipe 200 is fixed to the burner support 100, and the pulverized coal pipe 200 is provided with a pulverized coal inlet pipe 210 for introducing pulverized coal.

[0028] An axial flow duct 300 is inserted into a pulverized coal pipe 200. The axial flow duct 300 is sealed to the right end of the pulverized coal pipe 200, and the right end of the axial flow duct 300 extends to the right out of the pulverized coal pipe 200. An axial flow air connector 310 is provided at the part of the axial flow duct 300 that extends out of the pulverized coal pipe 200.

[0029] A swirl fan duct 400 is inserted into an axial fan duct 300. The right end of the swirl fan duct 400 is sealed to the right end of the axial fan duct 300, and the right end of the swirl fan duct 400 extends to the right out of the axial fan duct 300. A swirl fan connector 410 is provided on the portion of the swirl fan duct 400 extending outward from the axial fan duct 300. An oil gun pipe 500 is inserted into the swirl fan duct 400, and a swirl fan adjusting expansion joint 440 is connected between the oil gun pipe 500 and the right end of the swirl fan duct 400. The swirl fan adjusting expansion joint 440 is a retractable corrugated pipe structure.

[0030] Specifically, the burner bracket 100 is used to fix the burner in a preset position, and the burner bracket 100 is provided with a front support point and a rear support point. Further, the left ends of the pulverized coal pipe 200, axial flow air pipe 300, swirl air pipe 400, and oil gun pipe 500 are flush and concentrically arranged, with the left end being the outlet end. The left end of the pulverized coal pipe 200 channel can be used for casting and fixing. Further, the ignition device is located inside the oil gun pipe 500. Further, the outermost arrangement of the pulverized coal pipe 200 allows it to come into contact with high-temperature secondary air, thereby rapidly heating the pulverized coal and thus increasing the combustion speed.

[0031] Furthermore, the oil gun pipe 500 has a certain amount of axial space relative to the swirl air pipe 400. The expansion joint 440 can ensure the airtightness of the device while ensuring the sealed connection between the oil gun pipe 500 and the swirl air pipe 400, thus preventing stress damage at the connection due to excessive internal pressure.

[0032] Furthermore, a swirl fan is installed at the air inlet of the swirl fan pipe 410, which is used to deliver swirl air into the swirl fan duct 400. An axial fan is installed at the air inlet of the axial fan pipe 310, which is used to deliver a large amount of air into the axial fan duct 300. The axial fan pipe 310 and the swirl fan pipe 410 are located below the axial fan duct 300 and the swirl fan duct 400, respectively. Furthermore, a pulverized coal inlet pipe 210 is used to introduce pulverized coal into the pulverized coal duct 200 and to spray the pulverized coal outward from the left outlet of the pulverized coal duct 200. The pulverized coal inlet pipe 210 is inclined and located above the pulverized coal duct 200.

[0033] In this embodiment, the pulverized coal pipe 200, axial flow pipe 300, swirl flow pipe 400, and oil gun pipe 500 are all composed of a first part pipe and a second part pipe. The first part pipe and the second part pipe are connected by a keyway for sealing and sliding, allowing the first part pipe to move left and right relative to the second part pipe. This enables the flow-limiting air pipe to move left and right relative to the oil gun pipe 500 under pressure. Similarly, the axial flow air channel 320 can move left and right relative to the pulverized coal channel 220 under pressure. Therefore, the structural arrangement of the first part pipe and the second part pipe of the pulverized coal pipe 200, axial flow pipe 300, swirl flow pipe 400, and oil gun pipe 500 can avoid internal stress damage caused by excessive internal pressure, thereby ensuring the service life of the device.

[0034] In some embodiments of this utility model, such as Figure 2 and Figure 3 As shown, the swirl air duct 400 and the axial air duct 300 form an axial air channel 320. The left end of the swirl air duct 400 has a flared structure so that the outlet width of the axial air channel 320 gradually decreases to the left. The oil gun duct 500 and the swirl air duct 400 form the swirl air channel 420. The outer peripheral wall of the left end of the oil gun duct 500 gradually thickens to the left so that the outlet width of the swirl air channel 420 to the left is less than or equal to the width on the right side.

[0035] Specifically, the gradually decreasing width of the axial flow channel 320 towards the left outlet increases the airflow velocity of the axial flow, thereby increasing the air delivery volume and making combustion more complete. Furthermore, since the left end of the swirl channel 400 is flared, the thickening of the left end of the oil gun channel 500 ensures that the width of the swirl channel 400 does not increase at the left outlet, thus ensuring that the airflow velocity of the swirl channel remains at least constant.

[0036] In some embodiments of this utility model, such as Figure 2 and Figure 3 As shown, the outlet of the axial flow air passage 320 is provided with an axial flow air nozzle 330, and the axial flow air nozzle 330 has multiple axial flow air nozzles 331 evenly distributed circumferentially. The outlet of the swirl air passage 420 is provided with a swirl air nozzle 430, and the swirl air nozzle 430 has multiple central air nozzles 432 and swirl air nozzles 431 evenly distributed circumferentially, with the swirl air nozzles 431 located outside the central air nozzles 432.

[0037] Specifically, the axial flow nozzle 331 is circular, which enhances airflow penetration, effectively overcomes airflow resistance within the kiln, reduces airflow velocity attenuation, and provides better confinement of pulverized coal. Furthermore, the swirl nozzle 431 corrects the burner flame shape and can be a rectangular (including square) nozzle, or an annular nozzle with a swirl vane structure. Further, the central nozzle 432 can further correct the burner flame shape.

[0038] In this embodiment, both the axial flow nozzle 330 and the swirl flow nozzle 430 can be detachably installed.

[0039] In some embodiments of this utility model, such as Figure 2 and Figure 3 As shown, the first section of the pulverized coal pipe 200 and the axial flow air pipe 300 are fixedly connected by a connecting key 230, and the pulverized coal pipe 200 and the axial flow air pipe 300 constitute a pulverized coal channel 220. Specifically, the connecting key 230 can stabilize the internal structure.

[0040] In some embodiments of this utility model, such as Figure 2 and Figure 3 As shown, a thermal expansion adjustment mechanism 340 is connected between the right extension of the axial flow duct 300 and the right end of the pulverized coal duct 200. The thermal expansion adjustment mechanism 340 is used to limit the axial flow duct 300 to move to the right by a preset distance relative to the pulverized coal duct 200. Specifically, the thermal expansion adjustment mechanism 340 can ensure that the pulverized coal duct 200 remains sealed when the pressure in the pulverized coal channel 220 is too high, causing the axial flow duct 300 to move to the right relative to the pulverized coal duct 200, thereby eliminating stress damage.

[0041] In some embodiments of this utility model, such as Figure 2 and Figure 3 As shown, a swirl air valve 450 is provided on the swirl air inlet 410. An axial air valve 350 is provided on the axial air inlet 310. The swirl air valve 450 can control the opening and closing of the swirl air inlet 410, and the axial air valve 350 can control the opening and closing of the axial air inlet 310. In this embodiment, the axial air inlet 310 and the swirl air structure are connected to a clean air inlet.

[0042] In some embodiments of this utility model, such as Figure 1 As shown, a deceleration chamber 211 is provided at the connection between the pulverized coal inlet pipe 210 and the pulverized coal channel 220. The internal diameter of the deceleration chamber 211 is larger than the diameter of the pulverized coal inlet pipe 210. Specifically, the deceleration chamber 211 can reduce the speed at which pulverized coal enters the pulverized coal channel 200 from the pulverized coal inlet pipe 210, thereby increasing the density of pulverized coal in the pulverized coal channel 220.

[0043] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A coal-air external burner, characterized in that, include: Burner bracket; A pulverized coal pipeline is fixedly mounted on the burner support; the pulverized coal pipeline is provided with a pulverized coal inlet pipe for introducing pulverized coal. An axial flow duct is inserted into the pulverized coal pipe; the axial flow duct is sealed to the right end of the pulverized coal pipe, and the right end of the axial flow duct extends to the right out of the pulverized coal pipe; an axial flow air connector is provided at the part of the axial flow duct extending out of the pulverized coal pipe. A swirl air duct is inserted into an axial air duct; the right end of the swirl air duct is sealed to the right end of the axial air duct, and the right end of the swirl air duct extends to the right out of the axial air duct; a swirl air connector is provided on the part of the swirl air duct that extends outward from the axial air duct. The oil gun pipe is inserted into the swirl fan pipe; a swirl fan adjusting expansion joint is connected between the right end of the oil gun pipe and the swirl fan pipe; the swirl fan adjusting expansion joint is a retractable corrugated pipe structure.

2. The external coal-air burner according to claim 1, characterized in that, The swirl air duct and the axial air duct form an axial air channel; the left end of the swirl air duct has a flared structure so that the outlet width of the axial air channel gradually decreases to the left; the oil gun duct and the swirl air duct form a swirl air channel; the outer peripheral wall of the left end of the oil gun duct gradually thickens to the left so that the outlet width of the swirl air channel to the left is less than or equal to the width on the right.

3. The external coal-air burner according to claim 2, characterized in that, The outlet of the axial flow air channel is equipped with an axial flow air nozzle, and the axial flow air nozzle has multiple axial flow air nozzles evenly distributed in the circumferential direction.

4. The external coal-air burner according to claim 2, characterized in that, The outlet of the swirling air channel is provided with a swirling air nozzle. The swirling air nozzle has multiple central air nozzles and swirling air nozzles evenly distributed around its circumference, and the swirling air nozzles are located outside the central air nozzles.

5. The external coal-air burner according to claim 1, characterized in that, A thermal expansion adjustment mechanism is connected between the right extension of the axial flow duct and the right end of the pulverized coal duct; the thermal expansion adjustment mechanism is used to limit the axial flow duct to move only a preset distance to the right relative to the pulverized coal duct.

6. The external coal-air burner according to claim 1, characterized in that, The swirl air inlet is equipped with a swirl air valve; the axial air inlet is equipped with an axial air valve.

7. The external coal-air burner according to claim 1, characterized in that, A deceleration chamber is provided at the connection between the pulverized coal inlet pipe and the pulverized coal pipe; the inner diameter of the deceleration chamber is larger than the diameter of the pulverized coal inlet pipe.

8. The external coal-air burner according to claim 1, characterized in that, The pulverized coal pipeline, the axial flow air pipeline, the swirl air pipeline, and the oil gun pipeline are all composed of a first part of the pipeline and a second part of the pipeline. The first part of the pipeline and the second part of the pipeline are connected by a keyway for sealing and sliding connection.

9. The external coal-air burner according to claim 8, characterized in that, The first section of the pulverized coal pipeline and the axial flow air pipeline are fixedly connected by a connecting key, and the pulverized coal pipeline and the axial flow air pipeline constitute a pulverized coal channel.

10. The external coal-air burner according to claim 1, characterized in that, The inlet ends of the swirl air intake and the axial air intake are both connected to a clean air duct.

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