A coal powder concentration regulating device and coal powder burner

Abstract

The present invention belongs to the technical field of burners, and discloses a coal powder concentration regulating device, comprising: a coal powder conveying pipe, the coal powder conveying pipe comprises a straight pipe part and an elbow part, the head end of the elbow part is connected to the end of the straight pipe part, a baffle is arranged in the coal powder conveying pipe, the baffle separates the inner cavity of the coal powder conveying pipe into a conveying inner cavity close to the side of the small diameter of the elbow part and a conveying outer cavity away from the side of the small diameter of the elbow part; a combustion cavity, the combustion cavity is connected to the end of the elbow part, and the conveying outer cavity and the conveying inner cavity are both connected to the combustion cavity; an igniter, the igniter comprises an ignition source, the ignition source is arranged at the end outlet of the igniter and is placed in the combustion cavity; a blow pipe, the blow pipe is installed on the coal powder conveying pipe, the air outlet of the blow pipe is connected to the conveying inner cavity, and the blow pipe can convey air to the conveying inner cavity with an adjustable air supply volume. The coal powder concentration regulating device can adjust the coal powder concentration in the core ignition area to ensure the ignition effect of the coal powder burner.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, and in particular to a pulverized coal concentration regulating device and a pulverized coal burner. 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 wind speed and 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, the existing pulverized coal concentrators mostly adopt a fixed structure with poor adjustment performance. When the operating conditions change, the pulverized coal concentration in the core ignition area is not easy to adjust accordingly, which makes the ignition effect of the pulverized coal burner worse, which is not conducive to the normal operation of the pulverized coal burner. Summary of the invention

[0005] An object of the present invention is to provide a pulverized coal concentration regulating device, which can regulate the pulverized coal concentration in the core ignition area to ensure 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 conveying pipe, the pulverized coal conveying pipe comprising a straight pipe portion and an elbow portion, the head end of the elbow portion being connected to the end of the straight pipe portion, and a baffle being provided in the pulverized coal conveying pipe, the baffle dividing the inner cavity of the pulverized coal conveying pipe into an inner cavity close to the small diameter side of the elbow portion and an 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 comprising an ignition source, the ignition source being disposed at a terminal outlet of the igniter and disposed in the combustion chamber;

[0011] A blowing pipe is installed on the pulverized coal conveying pipe, an air outlet of the blowing pipe is connected to the conveying inner cavity, and the blowing pipe can convey air to the conveying inner cavity with an adjustable air supply volume.

[0012] Preferably, the blowing pipe is installed on the small diameter side of the elbow.

[0013] Preferably, the air outlet of the blowing pipe is arranged toward the baffle.

[0014] Preferably, the air outlet of the blowing pipe is arranged at an angle of -60° to 60° with respect to the cross section of the baffle.

[0015] Preferably, a nozzle is provided on the air outlet of the blowing pipe.

[0016] Preferably, the air inlet of the blowing pipe is connected to a pressurized air source for passing pressurized air into the conveying inner cavity, and the air supply volume can adjust the coal powder concentration in the core ignition zone.

[0017] Preferably, the cross-sectional shape of the baffle and the cross-sectional shape of the wall of the coal powder conveying pipe form a conveying inner cavity, and the coal powder in the conveying inner cavity is densely distributed near the baffle.

[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] Another object of the present invention is to provide a pulverized coal burner, the pulverized coal concentration in the core ignition area of ​​the pulverized coal burner can be adjusted to ensure the ignition effect of the pulverized coal burner.

[0021] To achieve this object, the present invention adopts the following technical solutions:

[0022] A pulverized coal burner comprises the pulverized coal concentration regulating device described in any of the above schemes.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides a coal powder concentration regulating device, which comprises a coal powder conveying pipe, a combustion chamber, an igniter and a blow pipe, wherein the coal powder conveying pipe is used to convey coal powder airflow, the combustion chamber is connected to the end of the coal powder conveying pipe and is used for coal powder combustion, and the ignition source 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 conveying pipe comprises a straight pipe portion and an elbow portion, a baffle is arranged in the coal powder conveying pipe, and the inner cavity of the coal powder conveying 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, and the blow pipe is installed on the coal powder conveying pipe, and the air outlet of the blow pipe is connected to the conveying inner cavity, and the air supply volume is adjustable to convey air to the conveying inner cavity.

[0025] When the coal powder airflow passes through the elbow, due to the action of the elbow and the baffle, concentrated coal powder will be formed in the conveying cavity of the elbow near the baffle, and the concentrated coal powder will be transported along the conveying cavity to the ignition source of the igniter and ignited by the ignition source. If the air supply volume of the blow pipe is reduced, the concentration of the concentrated coal powder will increase; if the air supply volume of the blow pipe is increased, the concentration of the concentrated coal powder will decrease. When the operating conditions of the coal powder burner change, the coal powder concentration in the core ignition area deviates from the optimal ignition concentration. By adjusting the air supply volume of the blow pipe, the coal powder concentration in the core ignition area can be made to tend to the optimal ignition concentration, thereby ensuring the ignition effect of the coal powder burner.

[0026] The present invention also provides a pulverized coal burner, which includes the above-mentioned pulverized coal concentration adjusting device. The pulverized coal burner can adjust the pulverized coal concentration in the core ignition area through the above-mentioned pulverized coal concentration adjusting device, so that when the operating conditions of the pulverized coal burner change, the pulverized coal concentration in the core ignition area can be adjusted, thereby ensuring the ignition effect of the pulverized coal burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a coal powder concentration regulating device provided in a specific embodiment of the present invention.

[0028] In the figure:

[0029] 1. Coal powder conveying pipe; 11. Straight pipe part; 12. Elbow part; 2. Baffle; 21. Conveying inner cavity; 22. Conveying outer cavity; 3. Combustion cavity; 4. Ignitor; 41. Ignition source; 42. Ignition source sheath; 43. Ignition barrel; 5. Blowing pipe; 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] The present invention provides a device for adjusting the concentration of pulverized coal, such as Figure 1As shown, the coal powder concentration regulating device includes a coal powder conveying pipe 1, a combustion chamber 3, an igniter 4 and a blow pipe 5. The combustion chamber 3 is installed at the end of the coal powder conveying pipe 1. The coal powder conveying pipe 1 is used to convey a coal powder airflow into the combustion chamber 3, and the coal powder airflow burns in the combustion chamber 3. The igniter 4 is connected to the combustion chamber 3, and the end outlet of the igniter 4 extends into the combustion chamber 3 to ignite the coal powder in the combustion chamber 3 to achieve ignition; the blow pipe 5 is installed on the coal powder conveying pipe 1, and the air outlet of the blow pipe 5 is connected to the inner cavity of the coal powder conveying pipe 1, and can convey air to the inner cavity of the coal powder conveying pipe 1 with an adjustable air supply volume, so as to achieve the regulation of the coal powder concentration in the coal powder conveying pipe 1, so that the coal powder concentration entering the combustion chamber 3 can be adjusted. Through the above structure, when the operating conditions of the pulverized coal burner change, the pulverized coal concentration in the core ignition area 100 in the combustion chamber 3 can be changed by changing the air supply volume of the blow pipe 5, so that the pulverized coal concentration in the core ignition area 100 can be adjusted to the pulverized coal concentration range most suitable for ignition under the changed operating conditions, thereby ensuring the ignition effect.

[0035] Specifically, if the air supply through the blowing pipe 5 is reduced, the concentration of coal powder will increase to adapt to the change in the operating condition of the coal powder burner, thereby ensuring the ignition effect of the coal powder burner; if the air supply through the blowing pipe 5 is increased, the concentration of coal powder will decrease to adapt to the change in the operating condition of the coal powder burner, thereby ensuring the ignition effect of the coal powder burner. Whether the coal powder concentration increases or decreases can be selected according to the changes in the operating condition of the coal powder burner.

[0036] In this embodiment, the pulverized coal conveying 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 baffle 2 is provided in the pulverized coal conveying pipe 1, and the baffle 2 divides the inner cavity of the pulverized coal conveying 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. 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. When the pulverized coal airflow passes through the elbow portion 12, the pulverized coal airflow in the conveying inner cavity 21 is densely distributed near the baffle 2 in the conveying inner cavity 21 of the elbow portion 12 to form concentrated pulverized coal, and the concentrated pulverized coal can be conveyed to the end of the igniter 4 along the conveying inner cavity 21 for ignition.

[0037] Preferably, the igniter 4 includes an ignition source 41, which is arranged at the terminal outlet of the igniter 4 and placed in the combustion chamber 3, so that the concentrated coal powder transported from the transport inner chamber 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 terminal side wall of the igniter 4 to protect the side wall of the terminal of the igniter 4 and prevent the terminal of the igniter 4 from being damaged by the high temperature in the combustion chamber 3. In this embodiment, the igniter 4 also includes an ignition barrel 43, which is connected to the terminal of the igniter 4 and is covered on the ignition source 41, so that the ignition source 41 can ignite the coal powder.

[0038] In this embodiment, the air outlet of the blowing pipe 5 is connected to the conveying inner cavity 21, and is used to convey air to the conveying inner cavity 21, so as to change the coal powder concentration of the conveying inner cavity 21. Preferably, the blowing pipe 5 is installed on the small diameter side of the elbow 12, which can avoid the blowing pipe 5 from occupying additional installation space again, which is conducive to saving space for the coal powder concentration regulating device. More preferably, the air outlet of the blowing pipe 5 is set to face the baffle 2, so that the air blown out of the blowing pipe 5 can dilute the concentrated coal powder, which is conducive to preventing the concentration of the concentrated coal powder from being too high. Specifically, the direction of the air outlet of the blowing pipe 5 is set to be at an angle of -60° to 60° with the cross-section of the baffle 2, so that the air blown out of the blowing pipe 5 can blow away the concentrated coal powder near the baffle 2, which is conducive to improving the dilution effect of the concentrated coal powder.

[0039] Preferably, a nozzle is provided on the air outlet of the blowing pipe 5, and the nozzle can make the airflow blown out of the blowing pipe 5 have a better diffusion effect, which is beneficial to the dilution of the concentrated coal powder. Specifically, the air inlet of the blowing pipe 5 is connected to the pressurized air source, and the pressurized air can be passed into the conveying inner cavity 21, which is beneficial to ensure the air supply of the blowing pipe 5, and the coal powder concentration in the core ignition area can be adjusted by adjusting the air supply of the blowing pipe 5. Optionally, the pressurized air source can be formed by compressed air from a fan.

[0040] The present invention also provides a pulverized coal burner, which includes the pulverized coal concentration regulating device provided by the present invention. The pulverized coal burner can adjust the pulverized coal concentration in the core ignition area 100 through the pulverized coal concentration regulating device, so that when the operating conditions of the pulverized coal burner change, the pulverized coal concentration in the core ignition area 100 can be adjusted accordingly, which is conducive to ensuring the ignition effect of the pulverized coal burner.

[0041] 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 shall 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 conveying pipe (1), the pulverized coal conveying pipe (1) comprising a straight pipe portion (11) and an elbow portion (12), the head end of the elbow portion (12) being connected to the tail end of the straight pipe portion (11), the pulverized coal conveying pipe (1) being provided with a baffle (2), the baffle (2) dividing the inner cavity of the pulverized coal conveying 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); A combustion cavity (3), the combustion cavity (3) being connected to the end of the elbow (12), the outer conveying cavity (22) and the inner conveying cavity (21) both being connected to the combustion cavity (3); An igniter (4), the igniter (4) comprising an ignition source (41), the ignition source (41) being arranged at a terminal outlet of the igniter (4) and placed in the combustion chamber (3); a blowing pipe (5), the blowing pipe (5) being installed on the pulverized coal conveying pipe (1), the air outlet of the blowing pipe (5) being connected to the conveying inner cavity (21), and the blowing pipe (5) being capable of conveying air to the conveying inner cavity (21) with an adjustable air supply volume; The blowing pipe (5) is installed on the small-diameter side of the elbow (12); The air outlet of the blowing pipe (5) is arranged toward the baffle (2); The air outlet of the blowing pipe (5) is arranged at an angle of -60° to 60° with the cross section of the baffle (2), so that the air blown out of the blowing pipe (5) can disperse the concentrated coal powder close to the baffle (2), which is beneficial to improving the dilution effect of the concentrated coal powder; The air inlet of the blowing pipe (5) is connected to a pressurized air source and is used to pass the pressurized air into the conveying inner cavity (21). The air supply volume can adjust the coal powder concentration in the core ignition zone.

2. The pulverized coal concentration regulating device according to claim 1, characterized in that: A nozzle is provided on the air outlet of the blowing pipe (5).

3. The pulverized coal concentration regulating device according to claim 1, characterized in that: The baffle (2) and the wall of the coal powder conveying pipe (1) form the conveying inner cavity (21), and the coal powder in the conveying inner cavity is densely distributed near the baffle (2).

4. 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).

5. The pulverized coal concentration regulating device according to claim 1, 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).

6. A pulverized coal burner, characterized in that: It comprises a pulverized coal concentration regulating device as described in any one of claims 1 to 5.

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