A coal powder concentration regulating device

Abstract

The present invention belongs to the technical field of burners, and discloses a coal powder concentration regulating device, comprising: a coal powder pipe, comprising a straight pipe part and an elbow part, the elbow part is installed on the straight pipe part, a partition plate is arranged in the coal powder pipe, the partition plate divides the inner cavity of the coal powder pipe into a conveying inner cavity close to the small diameter side of the elbow part and a conveying outer cavity away from the small diameter side of the elbow part; a combustion cavity, connected to the end of the elbow part, the conveying outer cavity and the conveying inner cavity are both connected to the combustion cavity; an igniter, installed on the combustion cavity, the end of the igniter is placed in the combustion cavity; an adjusting plate, the adjusting plate is placed in the inner cavity of the coal powder pipe, and a ventilation gap is arranged between the adjusting plate and the partition plate, the adjusting plate is rotatably connected to the inner wall of the coal powder pipe, and the adjusting plate can adjust the amount of coal powder entering the conveying inner cavity. The coal powder concentration regulating device can reduce the influence on the wind speed in the core ignition area while adjusting the coal powder concentration in the core ignition area, thereby ensuring the ignition effect of the coal powder burner.

Description

Technical Field

[0001] The invention relates to the technical field of burners, and in particular to a coal powder concentration regulating device. Background Art

[0002] Since coal is the main energy source in my country, pulverized coal burners are widely used in the field of burners. Plasma ignition technology has been used in the field of pulverized coal burners in my country for 20 years and has been widely used in the field of pulverized coal burners. Improving the coal quality adaptability and ignition performance of plasma ignition technology can improve the application effect of plasma ignition technology, which is of great significance to the continuous application and development of plasma ignition technology.

[0003] The coal powder burner using plasma ignition technology has a coal powder concentration range that is most suitable for ignition under certain structures and certain operating conditions. When the operating conditions change, the coal powder concentration in the core ignition area will change and deviate from the optimal ignition concentration range, reducing the ignition effect. In addition, when the coal quality changes, the coal powder concentration that is most suitable for ignition will also change, resulting in a poor ignition effect.

[0004] At present, most existing coal powder concentrators adopt a fixed structure with poor adjustment performance. When the operating conditions change, the coal powder concentration in the core ignition area is not easy to adjust accordingly, which makes the ignition effect of the coal powder burner worse, which is not conducive to the normal operation of the coal powder burner. Although in some coal powder concentrators, the concentration effect of coal powder can be adjusted by adjusting the opening of the adjustable diverter plate, this adjustment method will not only cause changes in the ventilation volume and pressure of the coal powder airflow conveying pipeline, but also change the wind speed in the core ignition area, which has an adverse effect on the ignition effect. Summary of the invention

[0005] An object of the present invention is to provide a pulverized coal concentration regulating device, which can reduce the impact on the wind speed in the core ignition area while regulating the pulverized coal concentration in the core ignition area, thereby ensuring the ignition effect of the pulverized coal burner.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A pulverized coal concentration regulating device, comprising:

[0008] A pulverized coal pipe, comprising a straight pipe portion and an elbow portion, wherein the elbow portion is installed at the end of the straight pipe portion, and a partition plate is provided in the pulverized coal pipe, wherein the partition plate divides the inner cavity of the pulverized coal pipe into a conveying inner cavity close to the small diameter side of the elbow portion and a conveying outer cavity away from the small diameter side of the elbow portion;

[0009] A combustion cavity, the combustion cavity is connected to the end of the elbow, and the conveying outer cavity and the conveying inner cavity are both connected to the combustion cavity;

[0010] An igniter, the igniter is mounted on the combustion chamber, a distal end of the igniter is placed in the combustion chamber, and is used to ignite the coal powder in the combustion chamber;

[0011] An adjusting plate is placed in the pulverized coal pipe and a ventilation gap is provided between the adjusting plate and the partition plate. The adjusting plate is rotatably connected to the inner wall of the pulverized coal pipe and can adjust the amount of pulverized coal entering the conveying inner cavity.

[0012] Preferably, the regulating plate comprises a rotating shaft and a diverter plate, the middle portion of the rotating shaft is connected to the diverter plate, and both ends of the rotating shaft are rotatably connected to the inner wall of the pulverized coal pipe.

[0013] Preferably, the rotating shaft is arranged on an extended surface of the partition plate of the straight tube portion.

[0014] Preferably, the rotating shaft is arranged in the conveying inner cavity.

[0015] Preferably, the rotating shaft is arranged in the conveying outer cavity.

[0016] Preferably, the rotating shaft is arranged to be parallel to the ventilation cross section of the straight pipe portion.

[0017] Preferably, the igniter comprises an ignition source, and the ignition source is arranged at the terminal outlet of the igniter.

[0018] Preferably, an ignition source sheath is provided on the end side wall of the igniter to protect the end of the igniter.

[0019] Preferably, the igniter further comprises an ignition bucket, which is connected to the end of the igniter and covers the ignition source.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a coal powder concentration regulating device, which comprises a coal powder pipe, a combustion chamber, an igniter and an regulating plate, wherein the coal powder pipe is used to convey coal powder airflow, the combustion chamber is connected to the end of the coal powder pipe and is used for coal powder combustion, and the end of the igniter is arranged in the combustion chamber and is used to ignite the coal powder conveyed to the combustion chamber. The coal powder pipe comprises a straight pipe portion and an elbow portion, a partition plate is arranged in the coal powder pipe, and the inner cavity of the coal powder pipe is divided into a conveying inner cavity close to the small diameter side of the elbow portion and a conveying outer cavity away from the small diameter side of the elbow portion, the regulating plate is arranged in the inner cavity of the coal powder pipe and a ventilation gap is arranged between the regulating plate and the partition plate, and the regulating plate is rotatably connected to the inner wall of the coal powder pipe to regulate the amount of coal powder entering the conveying inner cavity.

[0022] When the coal powder airflow passes through the elbow, due to the action of the elbow and the partition, concentrated coal powder will be formed in the conveying cavity of the elbow near the partition, and the concentrated coal powder will be transported to the end of the igniter along the conveying cavity and ignited by the igniter. When the operating conditions of the coal powder burner change, if the adjustment plate is rotated in the direction of increasing the ventilation of the introduction conveying cavity and reducing the ventilation of the introduction conveying outer cavity, the amount of coal powder entering the conveying cavity will increase, and the concentration of concentrated coal powder will also increase to adapt to the change that the core ignition area of ​​the coal powder burner needs to increase the concentration of coal powder, thereby ensuring the ignition effect of the coal powder burner; if the adjustment plate is rotated in the direction of reducing the ventilation of the introduction conveying cavity and increasing the ventilation of the introduction conveying outer cavity, the amount of coal powder entering the conveying cavity will decrease, and the concentration of concentrated coal powder will also decrease to adapt to the change that the core ignition area of ​​the coal powder burner needs to reduce the concentration of coal powder, thereby ensuring the ignition effect of the coal powder burner. At the same time, due to the existence of the ventilation gap, the pressure and ventilation volume between the conveying outer cavity and the conveying inner cavity do not change much during the adjustment process of the adjustment plate, so that the wind speed in the core ignition area does not change much, ensuring the ignition effect of the pulverized coal burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the structure of a pulverized coal concentration regulating device provided in Embodiment 1 of the present invention;

[0024] Figure 2 It is a schematic diagram of the pulverized coal concentration regulating device provided in the first embodiment of the present invention for increasing the amount of pulverized coal introduced into the conveying inner cavity;

[0025] Figure 3 It is a schematic diagram of the pulverized coal concentration regulating device provided in the first embodiment of the present invention to reduce the amount of pulverized coal introduced into the conveying inner cavity;

[0026] Figure 4 It is a schematic diagram of the pulverized coal concentration regulating device provided in the second embodiment of the present invention for increasing the amount of pulverized coal introduced into the core ignition area;

[0027] Figure 5It is a schematic diagram of the pulverized coal concentration regulating device provided in the third embodiment of the present invention for increasing the amount of pulverized coal introduced into the core ignition area.

[0028] In the figure:

[0029] 1. Pulverized coal pipe; 11. Straight pipe section; 12. Elbow section; 2. Partition plate; 21. Conveying inner cavity; 22. Conveying outer cavity; 3. Combustion cavity; 4. Ignitor; 41. Ignition source; 42. Ignition source sheath; 43. Ignition barrel; 5. Adjustment plate; 6. Ventilation gap; 100. Core ignition area. DETAILED DESCRIPTION

[0030] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] The technical solution of the coal powder concentration regulating device provided by the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0034] Embodiment 1

[0035] The present invention provides a device for adjusting the concentration of pulverized coal, such as Figure 1As shown, the pulverized coal concentration regulating device includes a pulverized coal pipe 1, a combustion chamber 3, an igniter 4 and an adjusting plate 5. The combustion chamber 3 is installed at the end of the pulverized coal pipe 1. The pulverized coal pipe 1 is used to convey pulverized coal airflow into the combustion chamber 3. The pulverized coal airflow burns in the combustion chamber 3. The igniter 4 is connected to the combustion chamber 3, and the end of the igniter 4 extends into the combustion chamber 3 to ignite the pulverized coal in the combustion chamber 3 to achieve ignition. The adjusting plate 5 is arranged in the inner cavity of the pulverized coal pipe 1 and is rotatably connected to the inner wall of the pulverized coal pipe 1. The amount of pulverized coal entering the conveying inner cavity 21 can be adjusted by rotation. Through the above structure, when the operating conditions of the pulverized coal burner change, the pulverized coal concentration in the core ignition area 100 can be changed by changing the distribution ratio of the pulverized coal entering the conveying inner cavity 21 and the conveying outer cavity 22, so that the pulverized coal concentration in the core ignition area 100 can also be adjusted to the pulverized coal concentration range most suitable for ignition under the changed operating conditions, thereby ensuring the ignition effect.

[0036] In this embodiment, the pulverized coal pipe 1 includes a straight pipe portion 11 and an elbow portion 12, the head end of the elbow portion 12 is connected to the end of the straight pipe portion 11, and the end of the elbow portion 12 is connected to the combustion chamber 3. Preferably, a partition plate 2 is provided in the pulverized coal pipe 1, and the partition plate 2 divides the inner cavity of the pulverized coal pipe 1 into a conveying inner cavity 21 close to the small diameter side of the elbow portion 12 and a conveying outer cavity 22 away from the small diameter side of the elbow portion 12, and the conveying outer cavity 22 and the conveying inner cavity 21 are both connected to the combustion chamber 3, and the pulverized coal airflow conveyed from the outside can enter the combustion chamber 3 through the conveying outer cavity 22 and the conveying inner cavity 21, wherein the pulverized coal airflow conveyed from the conveying inner cavity 21 is condensed by the partition plate 2, and the pulverized coal with a higher concentration enters the core ignition area 100 where the end of the igniter 4 in the combustion chamber 3 is located, and is ignited by the end of the igniter 4, and the pulverized coal airflow conveyed from the conveying outer cavity 22 mainly enters the periphery of the core ignition area 100.

[0037] Specifically, Figure 2 As shown in FIG. 1 , if the adjustment plate 5 is rotated in the direction of increasing the amount of pulverized coal introduced into the conveying inner cavity 21 and reducing the amount of pulverized coal introduced into the conveying outer cavity 22, the amount of pulverized coal entering the conveying inner cavity 21 increases, and the concentration of the concentrated pulverized coal will also increase to adapt to the change in the operating conditions of the pulverized coal burner, thereby ensuring the ignition effect of the pulverized coal burner; Figure 3 As shown, if the adjustment plate 5 is rotated in the direction of reducing the amount of coal powder introduced into the conveying inner cavity 21 and increasing the amount of coal powder introduced into the conveying outer cavity 22, the amount of coal powder entering the conveying inner cavity 21 will be reduced, and the concentration of concentrated coal powder will also be reduced to adapt to the change in the operating conditions of the coal powder burner, thereby ensuring the ignition effect of the coal powder burner.

[0038] In this embodiment, a ventilation gap 6 is provided between the adjustment plate 5 and the partition plate 2, and the air in the pulverized coal pipe 1 can circulate through the ventilation gap 6, so that during the adjustment process of the adjustment plate 5, the air pressure change between the conveying outer cavity 22 and the conveying inner cavity 21 does not change much, and the ventilation volume does not change much, so that the wind speed in the core ignition area 100 does not change much, which is beneficial to ensure the ignition effect of the pulverized coal burner.

[0039] Preferably, the regulating plate 5 includes a rotating shaft and a diverter plate, the middle part of the rotating shaft is fixedly connected to the diverter plate, and the two ends are rotatably connected to the inner wall of the pulverized coal pipe 1. Optionally, the middle part of the rotating shaft is fixedly connected to the diverter plate, and the two ends of the rotating shaft are rotatably connected to the inner wall of the pulverized coal pipe 1. Preferably, the rotating shaft is arranged on the extended surface where the partition plate 2 of the straight pipe portion 11 is located, so that the regulating plate 5 can simultaneously adjust the amount of pulverized coal introduced into the conveying inner cavity 21 and the conveying outer cavity 22 when rotating. In this embodiment, the initial position of the diverter plate is set to be parallel to the partition plate 2, so that the diverter plate has the least resistance to the pulverized coal airflow at the initial position and the weakest guiding effect on the pulverized coal airflow. Specifically, the rotating shaft limit is set to be parallel to the ventilation cross section of the straight pipe portion 11, so that the ventilation cross-sectional area adjusted by the regulating plate 5 when rotating is the largest, which is conducive to making the ventilation changes introduced into the conveying inner cavity 21 and the conveying outer cavity 22 obvious, and the adjustment effect is obvious.

[0040] In the present embodiment, the adjustment plate 5 also includes an adjustment rod, one end of which is connected to the rotating shaft, and the other end is an adjustment handle, so that the operator can operate the adjustment handle to adjust the rotation angle of the diverter plate. Preferably, the other end of the adjustment rod can also be connected to the output end of the servo motor, so that the rotation angle of the diverter plate can be adjusted by adjusting the output angle of the servo motor output end. In the present embodiment, the rotation angle range of the diverter plate is set to an angle of -60° to 60° with the partition plate 2, which can ensure the flow rate of pulverized coal gas passing through the inner cavity of the pulverized coal pipe 1, change the ignition state of the core ignition area 100, and ensure the combustion in the combustion chamber 3.

[0041] In this embodiment, the igniter 4 includes an ignition source 41, which is arranged at the end outlet of the igniter 4 and placed in the combustion chamber 3, so that the concentrated coal powder transported from the conveying inner cavity 21 can fully contact with the ignition source 41, which is conducive to ensuring the ignition effect. More preferably, an ignition source sheath 42 is provided on the end side wall of the igniter 4 to protect the side wall of the end of the igniter 4 and prevent the end of the igniter 4 from being damaged by high temperature and coal powder scouring. In this embodiment, the igniter 4 also includes an ignition barrel 43, the inner cavity of the ignition barrel 43 forms a core ignition area 100, which is connected to the end of the igniter 4 and is covered on the ignition source 41, so that the ignition source 41 can ignite the coal powder.

[0042] Embodiment 2

[0043] In this embodiment, if Figure 4 As shown, the difference between the coal powder concentration regulating device and the first embodiment is that: the first embodiment changes the distribution ratio of the coal powder in the conveying inner cavity 21 and the conveying outer cavity 22, thereby controlling the amount of concentrated coal powder entering the core ignition area 100, and the rotating shaft in the coal powder regulating device provided in this embodiment is arranged in the conveying outer cavity 22 of the elbow part 12, so as to change the coal powder distribution relationship inside the input outer cavity 22.

[0044] In this embodiment, when the operating conditions of the pulverized coal burner change, if the diverter plate is rotated to change the distribution of the pulverized coal in the outer cavity 22, the amount of pulverized coal in the outer cavity 22 distributed to the core ignition area 100 will increase to adapt to the change in the operating conditions of the pulverized coal burner, thereby ensuring the ignition effect of the pulverized coal burner.

[0045] Embodiment 3

[0046] In this embodiment, if Figure 5 As shown, the difference between the coal powder concentration regulating device and the first embodiment is that: the first embodiment changes the distribution ratio of the coal powder in the conveying inner cavity 21 and the conveying outer cavity, thereby controlling the amount of concentrated coal powder entering the core ignition area 100, and the rotating shaft in the coal powder regulating device provided in this embodiment is arranged in the conveying inner cavity 21 of the elbow part 12, so as to change the coal powder distribution relationship inside the input inner cavity 21.

[0047] In this embodiment, when the operating conditions of the pulverized coal burner change, if the diverter plate is rotated to change the distribution of pulverized coal in the conveying cavity 21, the amount of pulverized coal in the conveying cavity 21 distributed to the core ignition area 100 will increase to adapt to the change in the operating conditions of the pulverized coal burner, thereby ensuring the ignition effect of the pulverized coal burner.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A device for adjusting the concentration of pulverized coal, characterized in that: include: A pulverized coal pipe (1), comprising a straight pipe portion (11) and an elbow portion (12), wherein the elbow portion (12) is mounted at the end of the straight pipe portion (11), and a partition plate (2) is provided in the pulverized coal pipe (1), wherein the partition plate (2) divides the inner cavity of the pulverized coal pipe (1) into a conveying inner cavity (21) close to a small diameter side of the elbow portion (12) and a conveying outer cavity (22) away from a small diameter side of the elbow portion (12); A combustion cavity (3), the combustion cavity (3) being connected to the end of the elbow (12), the conveying outer cavity (22) and the conveying inner cavity (21) both being connected to the combustion cavity (3); an igniter (4), the igniter (4) being mounted on the combustion chamber (3), the end of the igniter (4) being placed in the combustion chamber (3) and being used to ignite the coal powder in the combustion chamber (3); an adjusting plate (5), the adjusting plate (5) being placed in the pulverized coal pipe (1) and having a ventilation gap (6) between the adjusting plate (5) and the partition plate (2), the adjusting plate (5) being rotatably connected to the inner wall of the pulverized coal pipe (1), and the adjusting plate (5) being capable of adjusting the amount of the pulverized coal entering the conveying inner cavity (21); The regulating plate (5) comprises a rotating shaft and a diverter plate, the middle portion of the rotating shaft is connected to the diverter plate, and both ends of the rotating shaft are rotatably connected to the inner wall of the pulverized coal pipe (1); The rotating shaft is arranged in the conveying inner cavity (21); The coal powder airflow transported from the outside can enter the combustion chamber (3) through the transport outer chamber (22) and the transport inner chamber (21), wherein the coal powder airflow transported from the transport inner chamber (21) is concentrated by the partition plate (2), and the coal powder with a higher concentration enters the core ignition area (100) where the end of the igniter (4) in the combustion chamber (3) is located, and is ignited by the end of the igniter (4), and the coal powder airflow transported from the transport outer chamber (22) mainly enters the periphery of the core ignition area (100).

2. The pulverized coal concentration regulating device according to claim 1, characterized in that: The rotating shaft is arranged on an extended surface of the partition plate (2) of the straight pipe portion (11).

3. The pulverized coal concentration regulating device according to claim 1, characterized in that: The rotating shaft is arranged in the outer conveying cavity (22).

4. The pulverized coal concentration regulating device according to any one of claims 2 to 3, characterized in that: The rotating shaft is arranged to be parallel to the ventilation cross section of the straight pipe portion (11).

5. The pulverized coal concentration regulating device according to claim 1, characterized in that: The igniter (4) comprises an ignition source (41), and the ignition source (41) is arranged at an end outlet of the igniter (4).

6. The pulverized coal concentration regulating device according to claim 1, characterized in that: An ignition source sheath (42) is provided on the side wall of the end of the igniter (4) for protecting the end of the igniter (4).

7. The pulverized coal concentration regulating device according to claim 5, characterized in that: The igniter (4) further comprises an ignition barrel (43), wherein the ignition barrel (43) is connected to the end of the igniter (4) and is covered on the ignition source (41).

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