Plasma ignition device

Abstract

The utility model relates to the technical field of pulverized coal combustion, and discloses a plasma ignition device which is characterized in that one end of a primary air pipe is connected with a connecting side pipe, the inner side of the connecting side pipe is provided with a plasma generator, the end part of the plasma generator is connected with an ignition pipe, and one side of the interior of the connecting side pipe is fixedly provided with a separation disc; a combustion cavity is formed in one side of the top of the primary air pipe, the discharge end of the primary air pipe is connected with an ignition extension pipe, the top of the ignition extension pipe is connected with a secondary air pipe, and based on resetting of the plasma generator, the ignition pipe can drive a wedging convex ring to be clamped into a wedging groove; and meanwhile, a fire-resistant cotton ring at the edge end of a wedging convex ring can be in close contact with a wedging groove, so that the connection position of the ignition tube and the separation disc is blocked, the plasma generator can be deeply used during ignition and can be effectively stored after ignition, and the ignition tube is prevented from affecting normal conveying of pulverized coal.

Description

Technical Field

[0001] This utility model relates to the field of pulverized coal combustion technology, specifically to a plasma ignition device. Background Technology

[0002] The plasma ignition device utilizes direct current to ignite an arc under a certain air pressure in the air medium, and obtains a stable power DC air plasma under the control of a strong magnetic field. This plasma forms a local high-temperature zone with a temperature T>4000K and a large temperature gradient in the central combustion tube of a specially designed burner. When pulverized coal particles come into contact with this high-temperature air plasma flow, the pulverized coal particles are rapidly broken up and burned. At the same time, the plasma flow and pulverized coal undergo a thermochemical reaction, releasing a large amount of volatiles from the pulverized coal, which intensifies the combustion of the pulverized coal and ignites it. The pulverized coal ignited in the ignition burner forms a combustion flame that is injected into the furnace, further igniting the pulverized coal injected into the furnace from the other burners, thereby achieving the purpose of igniting and starting the pulverized coal furnace.

[0003] Current plasma ignition devices, when igniting based on a plasma generator, place the ignition tube of the plasma generator inside the pulverized coal duct. After ignition, the ignition tube will obstruct the transport of pulverized coal inside the duct, affecting the normal transport of pulverized coal. At the same time, the ignition tube of the plasma generator is prone to accelerated damage if it is in the duct for a long time. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a plasma ignition device that solves the problem that in current plasma ignition devices, when igniting based on a plasma generator, the ignition tube of the plasma generator is placed inside the pulverized coal duct. After ignition, the ignition tube will obstruct the transport of pulverized coal inside the duct, affecting the normal transport of pulverized coal. At the same time, the ignition tube of the plasma generator is prone to accelerated damage if it is kept inside the duct for a long time.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model provides the following technical solution: a plasma ignition device, comprising a primary air duct, one end of which is connected to a connecting side pipe, a plasma generator installed inside the connecting side pipe, an ignition pipe connected to the end of the plasma generator, a partition plate fixedly installed on one side of the inside of the connecting side pipe, a combustion chamber provided on one side of the top of the primary air duct, an ignition extension pipe connected to the discharge end of the primary air duct, and a secondary air duct connected to the top of the ignition extension pipe;

[0007] A connecting screw is rotatably connected to the top inner side of the connecting side tube, and a guide rod is fixedly connected to the bottom inner side of the connecting side tube. The connecting screw and the guide rod are arranged parallel to each other, and a micro motor is connected to the end of the connecting screw. The edge of the plasma generator is connected to the connecting screw and the guide rod respectively through a connecting block.

[0008] The ignition tube has a matching protruding ring at its edge, the partition plate has a matching groove at its edge, and the matching protruding ring has a fire-resistant cotton ring at its edge.

[0009] As a preferred technical solution of the plasma ignition device of this utility model, the connecting screw is connected to the drive shaft of the micro motor, the micro motor is fixedly installed on the end cap that can be detachably connected to the end of the connecting side tube, and the connecting screw is rotatably connected inside the end cap.

[0010] As a preferred technical solution of the plasma ignition device of this utility model, one connecting block on the side of the plasma generator is connected to the connecting screw by a thread, and the other connecting block is slidably connected to the guide rod.

[0011] As a preferred technical solution of the plasma ignition device of this utility model, the ignition tube drives the matching protrusion ring to move into the matching groove, the matching protrusion ring and the matching groove are matched and connected, and the fire-resistant cotton ring is in close contact with the inside of the matching groove.

[0012] As a preferred technical solution of the plasma ignition device of this utility model, a connecting ring box is connected to the outer side of the ignition extension tube corresponding to the secondary air duct, and a gas supply sleeve is connected to the end of the connecting ring box located on the outer side of the secondary air duct. A gas collection chamber is provided inside the connecting ring box, and a distribution gas groove is evenly opened at the end of the connecting ring box. A jet bend is connected to the end of the gas supply sleeve at the position corresponding to the distribution gas groove.

[0013] The inner side of the gas supply sleeve is provided with baffles at equal angles, and the baffles are provided with guide strips evenly on their edges.

[0014] As a preferred technical solution of the plasma ignition device of this utility model, the outlet end of the secondary air duct is connected to the gas collection chamber inside the connecting ring box, and two sets of baffles are provided on the inner side of the gas supply sleeve corresponding to a distribution gas groove and a jet bend. The two sets of baffles enclose the ignition extension tube and the gas supply sleeve to form a separate gas supply chamber.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides a plasma ignition device with the following advantages:

[0017] 1. By connecting a side pipe to the end of the air duct, the plasma generator is installed in an insert manner. Through the drive structure composed of a connecting screw, guide rod, micro motor and connecting block, the plasma generator and ignition tube are driven inside the side pipe. During ignition, the tube moves, allowing the ignition tube to penetrate into the combustion chamber for ignition. Based on the reset of the plasma generator, the ignition tube can drive the matching convex ring to engage in the matching groove after ignition. At the same time, the fire-resistant cotton ring at the edge of the matching convex ring can make close contact with the matching groove, thereby sealing the connection position between the ignition tube and the partition plate, keeping the primary air duct and the combustion chamber connected, and facilitating combustion.

[0018] By designing the plasma generator as a movable structure, it can be used deeply during ignition and can be effectively stored after ignition, preventing the ignition tube from affecting the normal transportation of pulverized coal and avoiding accelerated damage to the ignition tube.

[0019] 2. By connecting the ring box, gas supply sleeve, gas collection chamber, and distribution gas trough, when the secondary air duct supplies gas, the airflow and pulverized coal can be concentrated in the gas collection chamber before being evenly discharged by the evenly arranged distribution gas trough. This allows the airflow and pulverized coal to be effectively and evenly distributed before transportation. Combined with the baffle plate, a separate gas supply channel is formed between the ignition extension pipe and the gas supply sleeve. The guide strip keeps the gas and pulverized coal evenly distributed when passing through, so that the airflow and pulverized coal after the initial equalization can be guided and transported in an orderly manner in a separate channel. The pulverized coal and airflow can then be discharged and burned through the jet bend pipe, ensuring uniformity and complete combustion of pulverized coal. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a cross-sectional view of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the separator plate of this utility model.

[0023] Figure 4 This is a cross-sectional view of the gas supply sleeve of this utility model.

[0024] Figure 5 This is a schematic diagram of the structure of the jet bend of this utility model.

[0025] in:

[0026] 1-Primary air duct; 2-Connecting side duct; 3-Plasma generator; 4-Ignition tube; 5-Divider plate; 6-Combustion chamber; 7-Ignition extension tube; 8-Secondary air duct; 9-Connecting screw; 10-Guide rod; 11-Micro motor; 12-Connecting block; 13-Matching convex ring; 14-Matching groove; 15-Refractory cotton ring; 16-Connecting ring box; 17-Gas supply sleeve; 18-Gas collection chamber; 19-Distribution gas groove; 20-Baffle plate; 21-Guide strip; 22-Jet bend Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0028] In the description of this utility model, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0029] In the description of this utility model, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not 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 the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0031] Please see Figure 1-5 The present invention provides the following technical solution: a plasma ignition device, including a primary air duct 1, one end of the primary air duct 1 is connected to a connecting side pipe 2, a plasma generator 3 is installed inside the connecting side pipe 2, the end of the plasma generator 3 is connected to an ignition pipe 4, and a partition plate 5 is fixedly installed on one side inside the connecting side pipe 2, a combustion chamber 6 is provided on one side of the top of the primary air duct 1, and an ignition extension pipe 7 is connected to the discharge end of the primary air duct 1, and a secondary air duct 8 is connected to the top of the ignition extension pipe 7.

[0032] A connecting screw 9 is rotatably connected to the top inner side of the connecting side tube 2, and a guide rod 10 is fixedly connected to the bottom inner side of the connecting side tube 2. The connecting screw 9 and the guide rod 10 are arranged parallel to each other, and a micro motor 11 is connected to the end of the connecting screw 9. The connecting screw 9 is connected to the drive shaft of the micro motor 11. The micro motor 11 is fixedly installed on the end cap that can be detachably connected to the end of the connecting side tube 2. The connecting screw 9 is rotatably connected inside the end cap. The micro motor 11 drives the connecting screw 9 to rotate, so that the micro motor 11 is stably installed. The side of the plasma generator 3 is connected to the connecting screw 9 and the guide rod 10 respectively through the connecting block 12. One connecting block 12 on the side of the plasma generator 3 is connected to the connecting screw 9 by a thread, and the other connecting block 12 is slidably connected to the guide rod 10. This allows the plasma generator 3 and the ignition tube 4 to move inside the connecting side tube 2.

[0033] The ignition tube 4 has a matching protruding ring 13 at its edge, and the partition plate 5 has a matching groove 14 at its edge. The matching protruding ring 13 is also provided with a fire-resistant cotton ring 15 at its edge. The ignition tube 4 moves the matching protruding ring 13 into the matching groove 14, and the matching protruding ring 13 and the matching groove 14 are matched and connected. The fire-resistant cotton ring 15 is in close contact with the inside of the matching groove 14, thereby sealing the connection between the ignition tube 4 and the partition plate 5, so that the primary air duct 1 and the combustion chamber 6 are kept connected, which facilitates combustion.

[0034] A connecting ring box 16 is connected to the outer side of the ignition extension tube 7 at the location corresponding to the secondary air duct 8. An air supply sleeve 17 is connected to the end of the connecting ring box 16 at the location outside the secondary air duct 8. An air collection chamber 18 is provided inside the connecting ring box 16. A distribution air groove 19 is evenly opened at the end of the connecting ring box 16. An air jet bend 22 is connected to the end of the air supply sleeve 17 at the location corresponding to the distribution air groove 19.

[0035] The inner side of the gas supply sleeve 17 is provided with baffles 20 at equal angles, and the baffles 20 are provided with guide strips 21 evenly. The outlet of the secondary air pipe 8 is connected to the gas collection chamber 18 inside the connecting ring box 16. Two sets of baffles 20 are provided on the inner side of the gas supply sleeve 17 corresponding to a distribution gas groove 19 and a jet bend 22. The two sets of baffles 20 form a separate gas supply chamber between the ignition extension pipe 7 and the gas supply sleeve 17. When the secondary air pipe 8 supplies gas, the airflow and coal dust can be concentrated in the gas collection chamber 18 first, and then evenly discharged by the evenly distributed distribution gas groove 19. This allows the airflow and coal dust to be effectively and evenly distributed before transportation. Combined with the baffles 20 forming a separate gas supply channel between the ignition extension pipe 7 and the gas supply sleeve 17, the guide strips 21 keep the gas and coal dust evenly distributed when passing through, so that the airflow and coal dust after initial equalization can be orderly guided and transported in the separate channel.

[0036] The working principle and usage process of this utility model: In actual application, when the unit is ignited, the plasma burner of layer B is usually used and the plasma burner of layer A is used as a backup. This arrangement has a low utilization rate. Therefore, the plasma burner of layer A and the burner of layer D are interchanged, and the plasma burner of layer D is used for ignition backup. At the same time, the plasma burner of layer D can ensure stable combustion when the upper mill combination is used at low load. Since the original plasma burner of layer A is fixed, the burner part needs to be replaced with a swingable type. The main body utilizes the original electric, water and gas system of layer A.

[0037] By adjusting and modifying the low-load stable combustion, the D-layer burner is replaced with a plasma burner to meet the stable combustion support requirements of the upper coal mill combination under low load, making the selection of low-load coal mill combination more flexible. In the actual ignition application of the ion ignition burner, the plasma generator 3 is first installed in the connecting side pipe 2 at the end of the air duct in an embedded manner. During ignition, the micro motor 11 drives the connecting screw 9 to rotate. Under the guidance of the guide rod 10, the connecting block 12 drives the plasma generator 3 and the ignition tube 4 to move inside the connecting side pipe 2, so that the ignition tube 4 penetrates into the combustion chamber 6 for ignition.

[0038] Coal powder is transported to the combustion chamber 6 via the primary air duct 1. Simultaneously, when the secondary air duct 8 supplies air, the airflow and coal powder are first concentrated in the gas collection chamber 18 and then evenly discharged through the uniformly arranged distribution gas grooves 19. This allows the airflow and coal powder to be effectively and evenly distributed before transportation. Combined with the baffle 20, a separate gas supply channel is formed between the ignition extension pipe 7 and the gas supply sleeve 17. The guide strip 21 keeps the gas and coal powder evenly distributed as they pass through, allowing the airflow and coal powder, after initial equalization, to be orderly guided and transported in the separate channel. The coal powder and airflow can then be discharged and burned through the jet bend pipe 22, ensuring uniformity and sufficient combustion of coal powder.

[0039] After ignition, the plasma generator 3 resets, allowing the ignition tube 4 to engage the mating ring 13 into the mating groove 14. Simultaneously, the refractory cotton ring 15 at the edge of the mating ring 13 makes tight contact with the mating groove 14, thus sealing the connection between the ignition tube 4 and the partition plate 5. This maintains communication between the primary air duct 1 and the combustion chamber 6, facilitating combustion. By designing the plasma generator 3 as a movable structure, it can be used deeply during ignition and effectively stored afterward, preventing the ignition tube 4 from interfering with the normal transport of pulverized coal and avoiding accelerated damage to the ignition tube 4.

[0040] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A plasma ignition device, comprising a primary air duct (1), characterized in that: One end of the primary air duct (1) is connected to a connecting side duct (2). A plasma generator (3) is installed inside the connecting side duct (2). An ignition pipe (4) is connected to the end of the plasma generator (3). A partition plate (5) is fixedly installed on one side inside the connecting side duct (2). A combustion chamber (6) is provided on one side of the top of the primary air duct (1). An ignition extension pipe (7) is connected to the discharge end of the primary air duct (1). A secondary air duct (8) is connected to the top of the ignition extension pipe (7). The inner top of the connecting side tube (2) is rotatably connected to a connecting screw (9), and the inner bottom of the connecting side tube (2) is fixedly connected to a guide rod (10). The connecting screw (9) and the guide rod (10) are arranged in parallel, and the end of the connecting screw (9) is connected to a micro motor (11). The side of the plasma generator (3) is connected to the connecting screw (9) and the guide rod (10) respectively through a connecting block (12). The ignition tube (4) is provided with a fitting protrusion ring (13) at its edge, the partition plate (5) is provided with a fitting groove (14) at its edge, and the fitting protrusion ring (13) is provided with a fire-resistant cotton ring (15) at its edge.

2. The plasma ignition device according to claim 1, characterized in that: The connecting screw (9) is connected to the drive shaft of the micro motor (11). The micro motor (11) is fixedly installed on the end cap that can be detachably connected to the end of the connecting side tube (2). The connecting screw (9) is rotatably connected inside the end cap.

3. The plasma ignition device according to claim 1, characterized in that: One connecting block (12) on the side of the plasma generator (3) is connected to the connecting screw (9) by a thread, and the other connecting block (12) is connected to the guide rod (10) by a through sliding connection.

4. The plasma ignition device according to claim 1, characterized in that: The ignition tube (4) drives the mating protrusion (13) to move into the mating groove (14), and the mating protrusion (13) and the mating groove (14) are mated and connected, and the fire-resistant cotton ring (15) is in close contact with the inside of the mating groove (14).

5. The plasma ignition device according to claim 1, characterized in that: A connecting ring box (16) is connected to the outer side of the ignition extension tube (7) corresponding to the secondary air duct (8), and an air supply sleeve (17) is connected to the end of the connecting ring box (16) located outside the secondary air duct (8). An air collection chamber (18) is provided inside the connecting ring box (16), and a distribution air groove (19) is evenly opened at the end of the connecting ring box (16). An air jet bend (22) is connected to the end of the air supply sleeve (17) at the position corresponding to the distribution air groove (19). The inner side of the gas supply sleeve (17) is provided with a baffle (20) at equal angles, and the baffle (20) is provided with guide strips (21) evenly on the side.

6. The plasma ignition device according to claim 5, characterized in that: The outlet of the secondary air duct (8) is connected to the air collection chamber (18) inside the connecting ring box (16). Two sets of baffles (20) are provided on the inner side of the air supply sleeve (17) corresponding to a distribution air groove (19) and a jet bend (22). The two sets of baffles (20) enclose a separate air supply chamber between the ignition extension tube (7) and the air supply sleeve (17).

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