Low-load stable-combustion burner

Abstract

The utility model discloses a low-load stable-combustion burner, and relates to the technical field of burners. The low-load stable-combustion burner comprises a pulverized coal nozzle body, one end of the pulverized coal nozzle body is provided with a flange, and the other end of the pulverized coal nozzle body is provided with an opening; the concentrated-phase pulverized coal pipeline is arranged in the pulverized coal nozzle body through a connecting assembly, and one end of the concentrated-phase pulverized coal pipeline is located at the opening; the light-phase pulverized coal pipeline is arranged around the outer side of the dense-phase pulverized coal pipeline, and one end of the light-phase pulverized coal pipeline is located at the opening; the air inlet air injection assembly is arranged between the outer side of the light-phase pulverized coal pipeline and the inner side of the pulverized coal nozzle body in a surrounding mode. The combustion stability of low-concentration pulverized coal is improved, combustion of high-concentration pulverized coal is promoted due to the fact that the light-phase pulverized coal pipeline is arranged on the outer side of the dense-phase pulverized coal pipeline in a surrounding mode, and compared with a staged oxygen adding mode adopted in the prior art, the air inlet air spraying assembly is simple in structure, small in occupied space and convenient to use. And meanwhile, the combustion stability of the pulverized coal burner under low load is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to a low-load stable combustion burner. Background Art

[0002] New energy sources such as wind power and photovoltaics provide us with a large amount of clean electricity, but the randomness and instability of wind power and photovoltaics also bring huge challenges to the safe operation of the power system and the guarantee of power supply. Thermal power is still an important way of power generation. Pulverized coal burners are an important component of thermal power generation. Pulverized coal burners have a specially designed multi-stage multi-nozzle air supply guide structure, which can generate high-temperature vortex in coal powder in a short time. It has the advantages of complete combustion, high thermal utilization rate, smoke and dust removal, high efficiency and energy saving, improved working conditions, and reduced labor intensity. It is an ideal product for energy saving and environmental protection.

[0003] However, the existing pulverized coal burners have poor combustion stability under low load. Currently, the staged oxygen addition method is used to supplement oxygen and promote fuel ignition. However, the structure of the staged oxygen addition device is complex and has a great impact on the flow field in the burner. Utility Model Content

[0004] In view of the defects existing in the prior art, the technical problem solved by the utility model is: how to improve the combustion stability of the pulverized coal burner under low load without affecting the flow field in the burner.

[0005] In order to achieve the above objectives, the utility model provides a low-load stable combustion burner, comprising:

[0006] A pulverized coal nozzle body, one end of which is provided with a flange and the other end of which is open;

[0007] A dense phase pulverized coal pipeline is arranged inside the pulverized coal nozzle body through a connecting assembly, and one end of the pipeline is located at the opening;

[0008] A light-phase pulverized coal pipeline is disposed around the outside of the dense-phase pulverized coal pipeline, with one end thereof being located at an opening;

[0009] The air intake air spray assembly is arranged around the outer side of the light phase coal powder pipeline and the inner side of the coal powder nozzle body.

[0010] In one embodiment, the air intake wind spray assembly includes an air spray assembly and an air intake assembly. The air spray assembly is arranged at the opening, one end of the air intake assembly is connected to the air spray assembly, and the other end thereof is connected to the fan.

[0011] In one embodiment, the air spray assembly includes a sleeve, a fixed ring and a gas nozzle. The fixed ring is sleeved on the outside of the sleeve, the sleeve is connected to the outside of the light phase coal powder pipeline, the fixed ring is connected to the inside of the coal powder nozzle body, and the gas nozzle is arranged on the fixed ring through a connecting piece. One end of the gas nozzle is located at the opening, and the other end thereof is connected to the air intake assembly.

[0012] In one embodiment, the connecting part includes an arc-shaped bottom groove and an arc-shaped pressure groove, a plurality of arc-shaped bottom grooves are opened on the inner side of the fixing ring, a plurality of arc-shaped pressure grooves matching the arc-shaped bottom grooves are opened on the outer side of the fixing ring, and the gas nozzle is arranged inside the arc-shaped bottom groove and the arc-shaped pressure groove.

[0013] In one embodiment, a plurality of peripheral wind nozzles are arranged around the interior of the fixing ring.

[0014] In one embodiment, the air intake assembly includes an annular tube and a pipeline. The annular tube is sleeved on the coal powder nozzle body, and the interior of the annular tube is connected to the interior of the air spray assembly. One end of the pipeline is located inside the annular tube, and the other end is connected to the fan.

[0015] In one embodiment, a pulverized coal concentrator is provided inside the pulverized coal nozzle body and is located between one end of the dense phase pulverized coal pipeline located inside the pulverized coal nozzle body and the flange.

[0016] In one embodiment, the connection assembly is a connection bracket, one end of which is connected to the inner wall of the coal powder nozzle body, and the other end of which is connected to the dense phase coal powder pipeline.

[0017] In one embodiment, the dense phase pulverized coal pipeline is located at one end of the opening, and a combustion stabilizer is disposed inside the pipeline.

[0018] In one embodiment, a plurality of spoilers are provided between the inner side of the light-phase pulverized coal pipeline and the outer side of the dense-phase pulverized coal pipeline.

[0019] Compared with the prior art, the advantages of the utility model are:

[0020] The utility model is provided with a dense phase coal powder pipeline and a light phase coal powder pipeline inside the coal powder nozzle body. By connecting the coal powder emitter to one end of the coal powder nozzle body through a flange, the coal powder is sprayed into the inside of the coal powder nozzle body, and the coal powder concentration is separated. The coal powder with higher concentration enters the dense phase coal powder pipeline, and the coal powder with lower concentration enters the light phase coal powder pipeline. The coal powder is sprayed out from the other end of the dense phase coal powder pipeline and the light phase coal powder pipeline and burns. At the same time, the port is sprayed with air through the air intake air spray component to form a partial high oxygen concentration area. Compared with the existing coal powder burner, the low-load stable combustion burner forms an oxygen concentration area at its end, which improves the stability of the combustion of coal powder with lower concentration. Because the light phase coal powder pipeline is arranged around the outside of the dense phase coal powder pipeline, the combustion of coal powder with higher concentration is promoted. Compared with the staged oxygenation method used in the prior art, the air intake air spray component has a simple structure and occupies a small space, and will not affect the flow field in the burner. At the same time, the combustion stability of the coal powder burner under low load is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a low-load stable combustion burner according to an embodiment of the utility model;

[0022] Figure 2 for Figure 1 A front view of

[0023] Figure 3 for Figure 1 sectional view of .

[0024] In the figure: 1-coal powder nozzle body, 2-flange, 3-pipeline, 4-annular pipe, 5-dense phase coal powder pipeline, 6-light phase coal powder pipeline, 7-spoiler, 8-burner stabilizer, 9-ring, 10-arc bottom groove, 11-peripheral wind nozzle, 12-fixing ring, 13-arc pressure groove, 14-gas nozzle, 15-connecting assembly, 16-concentrator. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0026] The low load stable combustion burner in the embodiment of the utility model, see Figure 1 As shown, it includes a pulverized coal nozzle body 1, one end of which is provided with a flange 2, and the other end of which is an opening; a dense phase pulverized coal pipeline 5 is provided inside the pulverized coal nozzle body 1 through a connecting component 15, one end of the dense phase pulverized coal pipeline 5 is located at the opening, and the other end thereof is located inside the pulverized coal nozzle body 1; a light phase pulverized coal pipeline 6 is arranged around the outside of the dense phase pulverized coal pipeline 5, one end of the light phase pulverized coal pipeline 6 is located at the opening, and the other end thereof is located inside the pulverized coal nozzle body 1; an air intake air spray assembly is arranged between the outside of the light phase pulverized coal pipeline 6 and the inside of the pulverized coal nozzle body 1, and the air spray port of the air intake air spray assembly is located at the opening.

[0027] It can be seen that the utility model is provided with a dense phase coal powder pipeline 5 and a light phase coal powder pipeline 6 inside its coal powder nozzle body 1. By connecting the coal powder emitter to one end of the coal powder nozzle body 1 through the flange 2, the coal powder is sprayed into the inside of the coal powder nozzle body 1, and the coal powder concentration is separated. The coal powder with higher concentration enters the dense phase coal powder pipeline 5, and the coal powder with lower concentration enters the light phase coal powder pipeline 6. The coal powder is sprayed out from the other end of the dense phase coal powder pipeline 5 and the light phase coal powder pipeline 6 and burns. At the same time, the port is sprayed with air through the air intake air injection component to form a partial high oxygen concentration area. Compared with the existing coal powder burner, the low-load stable combustion burner forms an oxygen concentration area at its end, which improves the stability of the combustion of coal powder with lower concentration. Because the light phase coal powder pipeline 6 is arranged around the outside of the dense phase coal powder pipeline 5, it promotes the combustion of coal powder with higher concentration. Compared with the staged oxygenation method used in the prior art, the air intake air injection component has a simple structure and occupies a small space, and will not affect the flow field in the burner. At the same time, it improves the combustion stability of the coal powder burner under low load.

[0028] Preferably, the air intake wind spray assembly includes an air spray assembly and an air intake assembly. The air spray assembly is arranged at an opening. One end of the air intake assembly is connected to the air spray assembly, and the other end thereof is connected to the fan. The wind provided by the fan enters the air spray assembly through the air intake assembly and is then sprayed out from the port of the air spray assembly.

[0029] Furthermore, a specific structure of an air spray assembly is provided:

[0030] The air injection assembly includes a sleeve ring 9, a fixed ring 12 and a gas nozzle 14. The fixed ring 12 is sleeved on the outside of the sleeve ring 9. The sleeve ring 9 is connected to the outside of the light phase coal powder pipeline 6. The fixed ring 12 is connected to the inside of the coal powder nozzle body 1. The gas nozzle 14 is arranged on the fixed ring 12 through a connecting piece. One end of the gas nozzle 14 is located at the opening, and the other end thereof is connected to the air intake assembly.

[0031] It should be noted that the number of the gas nozzles 14 can be designed according to specific work requirements, and can be one or more, and the spacing between the gas nozzles 14 can be the same or different.

[0032] Furthermore, a specific structure of a connecting piece is provided:

[0033] The connecting piece includes an arc bottom groove 10 and an arc pressure groove 13. A plurality of arc bottom grooves 10 are opened on the inner side of the fixing ring 12, and a plurality of arc pressure grooves 13 matching the arc bottom grooves 10 are opened on the outer side of the fixing ring 12. The gas nozzle 14 is arranged inside the arc bottom groove 10 and the arc pressure groove 13.

[0034] It should be noted that the designed number of arc-shaped bottom grooves 10 and arc-shaped pressure grooves 13 depends on the number of gas nozzles 14 . One arc-shaped bottom groove 10 and one corresponding arc-shaped pressure groove 13 are combined to install one gas nozzle 14 .

[0035] Furthermore, one or more peripheral wind nozzles 11 are arranged around the interior of the fixing ring 12 , and the intervals between two adjacent peripheral wind nozzles 11 are the same or different.

[0036] It should be noted that the function of the peripheral wind is to cool the primary air inlet, prevent the air inlet from overheating and deformation, enhance the rigidity of the primary air, and prevent the airflow from deflecting. The peripheral wind forms a layer of air curtain for the primary airflow, which can prevent the pulverized coal torch from sticking to the wall and the pulverized coal from separating from the airflow. After the pulverized coal airflow ignites, a small amount of secondary air can be supplied in time, which is beneficial to the development of the combustion process.

[0037] Preferably, a specific structure of an air intake assembly is provided:

[0038] The air intake assembly includes an annular tube 4 and a pipeline 3. The annular tube 4 is sleeved on the pulverized coal nozzle body 1, and the interior of the annular tube 4 is connected to the interior of the air injection assembly. One end of the pipeline 3 is located inside the annular tube 4, and the other end is connected to the fan.

[0039] Preferably, a pulverized coal concentrator 16 is provided inside the pulverized coal nozzle body 1, and is located between one end of the dense phase pulverized coal pipeline 5 located inside the pulverized coal nozzle body 1 and the flange 2;

[0040] Specifically, the pulverized coal concentrator 16 is composed of two corresponding convex bodies, which are triangular or trapezoidal.

[0041] Preferably, the connecting assembly 15 is a connecting bracket, one end of which is connected to the inner wall of the pulverized coal nozzle body 1 , and the other end of which is connected to the dense-phase pulverized coal pipeline 5 .

[0042] Preferably, the dense-phase pulverized coal pipeline 5 is located at one end of the opening, and a combustion stabilizer 8 is disposed inside the pipeline.

[0043] It should be noted that the flame stabilizer 8 causes a certain degree of diffusion or rotation of the primary air flow at the burner outlet, forming a high-temperature flue gas reflux, or generating a local increase in fuel concentration to stabilize ignition and combustion.

[0044] Preferably, one or more spoilers 7 are provided between the inner side of the light-phase pulverized coal pipeline 6 and the outer side of the dense-phase pulverized coal pipeline 5 .

[0045] Example 1

[0046] The low-load stable combustion burner in the embodiment of the utility model includes a pulverized coal nozzle body 1, one end of which is provided with a flange 2, and the other end of which is an opening; a dense phase pulverized coal pipeline 5 is provided inside the pulverized coal nozzle body 1 through a connecting component 15, one end of the dense phase pulverized coal pipeline 5 is located at the opening, and the other end thereof is located inside the pulverized coal nozzle body 1; a light phase pulverized coal pipeline 6 is arranged around the outside of the dense phase pulverized coal pipeline 5, one end of the light phase pulverized coal pipeline 6 is located at the opening, and the other end thereof is located inside the pulverized coal nozzle body 1; an air intake air spray assembly is arranged between the outside of the light phase pulverized coal pipeline 6 and the inside of the pulverized coal nozzle body 1, and the air spray port of the air intake air spray assembly is located at the opening.

[0047] The air intake wind spray assembly comprises an air spray assembly and an air intake assembly. The air spray assembly is arranged at the opening. One end of the air intake assembly is connected to the air spray assembly, and the other end thereof is connected to the fan.

[0048] The air spray assembly includes a collar 9, a fixed ring 12 and a gas nozzle 14. The fixed ring 12 is sleeved on the outside of the collar 9. The collar 9 is connected to the outside of the light phase pulverized coal pipeline 6. The fixed ring 12 is connected to the inside of the pulverized coal nozzle body 1. A plurality of arc-shaped bottom grooves 10 are provided on the inside of the fixed ring 12. A plurality of arc-shaped pressure grooves 13 matching the arc-shaped bottom grooves 10 are provided on the outside of the fixed ring 12. The gas nozzle 14 is arranged inside the arc-shaped bottom grooves 10 and the arc-shaped pressure grooves 13. One end of the gas nozzle 14 is located at the opening, and the other end thereof is connected to the air intake assembly. A peripheral air nozzle 11 is provided around the inside of the fixed ring 12.

[0049] The air intake assembly includes an annular tube 4 and a pipeline 3. The annular tube 4 is sleeved on the pulverized coal nozzle body 1, and the interior of the annular tube 4 is connected to the interior of the air injection assembly. One end of the pipeline 3 is located inside the annular tube 4, and the other end is connected to the fan.

[0050] A pulverized coal concentrator 16 is provided inside the pulverized coal nozzle body 1, and is located between one end of the dense-phase pulverized coal pipeline 5 located inside the pulverized coal nozzle body 1 and the flange 2; the connecting assembly 15 is a connecting bracket, one end of which is connected to the inner wall of the pulverized coal nozzle body 1, and the other end of which is connected to the dense-phase pulverized coal pipeline 5; the dense-phase pulverized coal pipeline 5 is located at one end of the opening, and a flame stabilizer 8 is provided inside it; a spoiler 7 is provided between the inner side of the light-phase pulverized coal pipeline 6 and the outer side of the dense-phase pulverized coal pipeline 5.

[0051] Example 2

[0052] The low-load stable combustion burner in the embodiment of the utility model includes a pulverized coal nozzle body 1, one end of which is provided with a flange 2, and the other end of which is an opening; a dense phase pulverized coal pipeline 5 is provided inside the pulverized coal nozzle body 1 through a connecting component 15, one end of the dense phase pulverized coal pipeline 5 is located at the opening, and the other end thereof is located inside the pulverized coal nozzle body 1; a light phase pulverized coal pipeline 6 is arranged around the outside of the dense phase pulverized coal pipeline 5, one end of the light phase pulverized coal pipeline 6 is located at the opening, and the other end thereof is located inside the pulverized coal nozzle body 1; an air intake air spray assembly is arranged between the outside of the light phase pulverized coal pipeline 6 and the inside of the pulverized coal nozzle body 1, and the air spray port of the air intake air spray assembly is located at the opening.

[0053] The air intake wind spray assembly comprises an air spray assembly and an air intake assembly. The air spray assembly is arranged at the opening. One end of the air intake assembly is connected to the air spray assembly, and the other end thereof is connected to the fan.

[0054] The air spray assembly includes a collar 9, a fixed ring 12 and a gas nozzle 14. The fixed ring 12 is sleeved on the outside of the collar 9. The collar 9 is connected to the outside of the light phase pulverized coal pipeline 6. The fixed ring 12 is connected to the inside of the pulverized coal nozzle body 1. A plurality of arc bottom grooves 10 are provided on the inside of the fixed ring 12. A plurality of arc pressure grooves 13 matching the arc bottom grooves 10 are provided on the outside of the fixed ring 12. The gas nozzle 14 is arranged inside the arc bottom grooves 10 and the arc pressure grooves 13. One end of the gas nozzle 14 is located at the opening, and the other end thereof is connected to the air intake assembly. A plurality of peripheral air nozzles 11 are provided around the inside of the fixed ring 12, and the spacing between two adjacent peripheral air nozzles 11 is the same.

[0055] The air intake assembly includes an annular tube 4 and a pipeline 3. The annular tube 4 is sleeved on the pulverized coal nozzle body 1, and the interior of the annular tube 4 is connected to the interior of the air injection assembly. One end of the pipeline 3 is located inside the annular tube 4, and the other end is connected to the fan.

[0056] A coal powder concentrator 16 is provided inside the coal powder nozzle body 1, and is located between one end of the dense phase coal powder pipeline 5 located inside the coal powder nozzle body 1 and the flange 2; the connecting component 15 is a connecting bracket, one end of which is connected to the inner wall of the coal powder nozzle body 1, and the other end of which is connected to the dense phase coal powder pipeline 5; the dense phase coal powder pipeline 5 is located at one end of the opening, and a flame stabilizer 8 is provided inside it; a plurality of spoilers 7 are provided between the inner side of the light phase coal powder pipeline 6 and the outer side of the dense phase coal powder pipeline 5.

[0057] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0058] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0059] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A low-load stable combustion burner, characterized in that: It includes: A pulverized coal nozzle body (1) is provided with a flange (2) at one end and is open at the other end; A dense phase pulverized coal pipeline (5) is arranged inside the pulverized coal nozzle body (1) through a connecting assembly (15), with one end of the pipeline being located at the opening; A light-phase pulverized coal pipeline (6) is disposed around the outside of the dense-phase pulverized coal pipeline (5), with one end of the pipeline being located at an opening; An air intake air spray assembly is disposed around the outside of the light phase coal powder pipeline (6) and the inside of the coal powder nozzle body (1).

2. The low-load stable combustion burner according to claim 1, characterized in that: The air intake wind spray assembly comprises an air spray assembly and an air intake assembly. The air spray assembly is arranged at the opening. One end of the air intake assembly is connected to the air spray assembly, and the other end of the air intake assembly is connected to the fan.

3. The low-load stable combustion burner according to claim 2, characterized in that: The air injection assembly comprises a sleeve ring (9), a fixed ring (12) and a gas nozzle (14); the fixed ring (12) is sleeved on the outer side of the sleeve ring (9); the sleeve ring (9) is connected to the outer side of the light phase coal powder pipeline (6); the fixed ring (12) is connected to the inner side of the coal powder nozzle body (1); the gas nozzle (14) is arranged on the fixed ring (12) through a connecting piece; one end of the gas nozzle (14) is located at an opening, and the other end thereof is connected to an air intake assembly.

4. The low-load stable combustion burner according to claim 3, characterized in that: The connecting piece comprises an arc-shaped bottom groove (10) and an arc-shaped pressure groove (13); a plurality of arc-shaped bottom grooves (10) are provided on the inner side of a fixing ring (12); a plurality of arc-shaped pressure grooves (13) matching the arc-shaped bottom grooves (10) are provided on the outer side of the fixing ring (12); and a gas nozzle (14) is arranged inside the arc-shaped bottom groove (10) and the arc-shaped pressure groove (13).

5. The low-load stable combustion burner according to claim 3, characterized in that: A plurality of peripheral wind nozzles (11) are arranged around the interior of the fixing ring (12).

6. The low-load stable combustion burner according to claim 2, characterized in that: The air intake assembly comprises an annular tube (4) and a pipeline (3); the annular tube (4) is sleeved on the pulverized coal nozzle body (1), and the interior of the annular tube (4) is connected to the interior of the air injection assembly; one end of the pipeline (3) is located inside the annular tube (4), and the other end thereof is connected to the fan.

7. The low-load stable combustion burner according to claim 1, characterized in that: A pulverized coal concentrator (16) is provided inside the pulverized coal nozzle body (1) and is located between one end of the dense phase pulverized coal pipeline (5) located inside the pulverized coal nozzle body (1) and the flange (2).

8. The low-load stable combustion burner according to claim 1, characterized in that: The connection assembly (15) is a connection bracket, one end of which is connected to the inner wall of the pulverized coal nozzle body (1), and the other end of which is connected to the dense phase pulverized coal pipeline (5).

9. The low-load stable combustion burner according to claim 1, characterized in that: The dense-phase pulverized coal pipeline (5) is located at one end of the opening, and a combustion stabilizer (8) is arranged inside the pipeline.

10. The low-load stable combustion burner according to claim 1, characterized in that: A plurality of spoilers (7) are arranged between the inner side of the light-phase pulverized coal pipeline (6) and the outer side of the dense-phase pulverized coal pipeline (5).

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