Anti-coking low-load stable combustion burner

Abstract

An anti-coking low-load stable combustion burner comprises a burner sleeve, and a pulverized coal burner is arranged in the burner sleeve. An air supply unit is arranged on the outer side of the combustor sleeve, the air supply unit comprises a cooling air sleeve arranged on the outer side of the combustor in a sleeving mode, a second-stage sleeve is further arranged on the inner side of the cooling air sleeve, and a middle interval sleeve is arranged between the cooling air sleeve and the second-stage sleeve. According to the combustor, the two stages of combustor sleeves are arranged, the cooling air sleeves are arranged on the outer sides of the combustor sleeves, and the combustor can adjust the wall temperature of the first-stage combustor sleeve and the wall temperature of the second-stage combustor sleeve through the change of the air volume in the cooling air sleeves according to the different coal quality of pulverized coal serving as fuel and the different operation working conditions of the combustor; therefore, sufficient combustion of the pulverized coal in the combustor sleeve is guaranteed, and the phenomenon of flameout or excessive combustion is avoided.

Description

Technical Field

[0001] This application relates to a low-load stable combustion burner that prevents coking. Background Technology

[0002] With the continuous growth of new energy installed capacity, the flexibility requirements for coal-fired power units are becoming increasingly stringent. Peak loads are decreasing, and the need for unit flexibility retrofitting places higher demands on boiler combustion stability at low loads, requiring stable combustion even under extremely low load conditions. Traditional plasma and oxygen-enriched micro-oil burners are no longer sufficient to meet the current requirements for deep peak shaving and stable combustion at low loads. They inevitably encounter problems such as burner coking, overheating and burn-out, and inability to remove oil, affecting the safe and stable operation of the equipment. Utility Model Content

[0003] To address the aforementioned issues, this application proposes an anti-coking, low-load, stable-burning burner, comprising a burner sleeve containing a pulverized coal burner; an air supply unit is provided on the outside of the burner sleeve, the air supply unit including a cooling air sleeve fitted on the outside of the burner, a secondary sleeve on the inside of the cooling air sleeve, and an intermediate spacer sleeve between the cooling air sleeve and the secondary sleeve, allowing air to sequentially pass through a first flow channel between the cooling air sleeve and the intermediate spacer sleeve, a second flow channel between the intermediate spacer sleeve and the secondary sleeve, and a third flow channel between the secondary sleeve and the burner sleeve, before communicating with the space on the side of the burner sleeve away from the pulverized coal burner. This application is equipped with a two-stage burner bushing. A cooling air bushing is installed on the outside of the burner bushing. Depending on the quality of the pulverized coal used as fuel and the different operating conditions of the burner, the burner can adjust the wall temperature of the first-stage burner bushing and the wall temperature of the second-stage burner bushing by changing the air volume in the cooling air bushing, thereby ensuring that the pulverized coal is fully burned in the burner bushing and preventing flameout or over-burning.

[0004] Preferably, the end of the cooling air sleeve away from the pulverized coal burner extends beyond the burner sleeve. An outer end baffle is provided at the end of the cooling air sleeve and the secondary sleeve away from the burner sleeve. The other end of the secondary sleeve extends into the inner side of the burner sleeve. An annular inflow channel is formed at the end between the outer side of the secondary sleeve and the burner sleeve. A combustion stabilizing part is provided in the annular inflow channel. An inner end baffle is provided between the cooling air sleeve and the burner sleeve. One end of the intermediate spacer sleeve is connected to the inner end baffle, and the other end of the intermediate spacer sleeve is spaced apart from the outer end baffle by a first deflection channel. A second deflection channel is spaced apart between the secondary sleeve and the inner end baffle.

[0005] Preferably, the flame stabilizing sections are not uniformly distributed; there are at least three flame stabilizing sections, evenly distributed in the upper half of the annular inflow channel. This application designs flame stabilizing sections at the position where the secondary bushing air is introduced into the burner bushing, enhancing the burner's ignition performance. Because no flame stabilizing teeth are designed at the lower part, the purging effect of the secondary bushing on the lower part is improved, avoiding problems such as coking and slagging at the burner nozzle.

[0006] Preferably, an inner support plate is provided on the inner side of the burner sleeve, the pulverized coal burner is fixedly mounted on the inner support plate, and a plurality of first auxiliary gas channels communicating with the burner sleeve are provided on the inner support plate.

[0007] Preferably, the inner end partition is provided with a plurality of second auxiliary air channels that are connected to the second baffle channel at the position corresponding to the second baffle channel.

[0008] Preferably, the inner side of the burner bushing is provided with several first temperature measuring points for measuring the burner bushing wall temperature; the inner side of the secondary bushing is provided with several second temperature measuring points for measuring the secondary bushing wall temperature, the second temperature measuring points being located in front of the burner bushing. This application provides temperature measuring points at the burner bushing, at the burner bushing outlet, and inside the secondary bushing, respectively, to reflect real-time temperature changes through these specific measuring points, providing real-time basis for adjusting fuel quantity and air volume.

[0009] Preferably, the flame-stabilizing part is a flame-stabilizing tooth.

[0010] Preferably, the pulverized coal burner includes an air-coal inlet, a tapered tube with a gradually increasing cross-sectional area is provided on one side of the air-coal inlet, an ignition fuel gun extending into the tapered tube is provided in the middle of the air-coal inlet, and a cyclone separator is provided on the side of the tapered tube away from the tapered tube.

[0011] This application can bring the following beneficial effects:

[0012] 1. This application is equipped with a two-stage burner bushing. A cooling air bushing is installed on the outside of the burner bushing. Depending on the quality of the pulverized coal used as fuel and the different operating conditions of the burner, the burner can adjust the wall temperature of the first-stage burner bushing and the wall temperature of the second-stage burner bushing by changing the air volume in the cooling air bushing, thereby ensuring that the pulverized coal is fully burned in the burner bushing and preventing flameout or over-burning.

[0013] 2. This application has a flame stabilizing section designed at the position where the secondary bushing air is introduced into the front of the burner bushing to enhance the ignition performance of the burner. Since there are no flame stabilizing teeth designed at the bottom, the purging effect of the secondary bushing on the bottom can be improved, avoiding problems such as coking and slagging at the burner nozzle.

[0014] 3. This application sets temperature measuring points at the burner bushing, the burner bushing outlet, and inside the secondary bushing. These measuring points reflect real-time temperature changes, providing real-time data for adjusting fuel quantity and air volume. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of this application;

[0017] Figure 2 This is a side view of this application. Detailed Implementation

[0018] To clearly illustrate the technical features of this solution, the following detailed description, in conjunction with the accompanying drawings, will be provided.

[0019] In the first embodiment, such as Figure 1 As shown, a low-load stable combustion burner for preventing coking includes a burner sleeve 1, and a pulverized coal burner 2 is installed inside the burner sleeve 1. An air supply unit is installed on the outside of the burner sleeve 1. The air supply unit includes a cooling air sleeve 3 sleeved on the outside of the burner. A secondary sleeve 4 is also installed on the inside of the cooling air sleeve 3. An intermediate spacer sleeve 5 is installed between the cooling air sleeve 3 and the secondary sleeve 4 so that air passes sequentially through a first flow channel 6 between the cooling air sleeve 3 and the intermediate spacer sleeve 5, a second flow channel 7 between the intermediate spacer sleeve 5 and the secondary sleeve 4, and a third flow channel 8 between the secondary sleeve 4 and the burner sleeve 1, and then communicates with the space on the side of the burner sleeve 1 away from the pulverized coal burner 2.

[0020] When the stable combustion burner is running, pulverized coal and air carrying the pulverized coal are introduced into the pulverized coal burner 2 and burned in the burner sleeve 1. Then the air flows out into the secondary sleeve. At this time, supplementary air is introduced, that is, the external air supply enters the front position of the burner sleeve 1 through the first flow channel 6, the second flow channel 7, and the third flow channel 8. After being completely mixed, the mixture continues to burn.

[0021] In the second embodiment, as Figure 1-2As shown, a low-load stable combustion burner for preventing coking includes a burner sleeve 1, and a pulverized coal burner 2 is installed inside the burner sleeve 1. An air supply unit is installed on the outside of the burner sleeve 1. The air supply unit includes a cooling air sleeve 3 sleeved on the outside of the burner. A secondary sleeve 4 is also installed on the inside of the cooling air sleeve 3. An intermediate spacer sleeve 5 is installed between the cooling air sleeve 3 and the secondary sleeve 4 so that air passes sequentially through a first flow channel 6 between the cooling air sleeve 3 and the intermediate spacer sleeve 5, a second flow channel 7 between the intermediate spacer sleeve 5 and the secondary sleeve 4, and a third flow channel 8 between the secondary sleeve 4 and the burner sleeve 1, and then communicates with the space on the side of the burner sleeve 1 away from the pulverized coal burner 2.

[0022] The cooling air sleeve 3 extends beyond the burner sleeve 1 at one end away from the pulverized coal burner 2. An outer end baffle 9 is provided at the ends of the cooling air sleeve 3 and the secondary sleeve 4 away from the burner sleeve 1. The other end of the secondary sleeve 4 extends into the inner side of the burner sleeve 1. An annular inflow channel 10 is formed at the end between the outer sides of the secondary sleeve 4 and the burner sleeve 1. A combustion stabilizing section 11 is provided within the annular inflow channel 10. An inner end baffle 12 is provided between the cooling air sleeve 3 and the burner sleeve 1. One end of the intermediate spacer sleeve 5 is connected to the inner end baffle 12, and the other end of the intermediate spacer sleeve 5 is spaced apart from the outer end baffle 9 by a first baffle channel 13. A second baffle channel 14 is spaced apart between the secondary sleeve and the inner end baffle 12. The combustion stabilizing sections 11 are not uniformly distributed; there are at least three combustion stabilizing sections 11, evenly distributed in the upper half of the annular inflow channel 10. An inner support plate 15 is provided on the inner side of the burner sleeve 1, and the pulverized coal burner 2 is fixedly mounted on the inner support plate 15. Several first auxiliary gas channels 16 communicating with the burner sleeve 1 are provided on the inner support plate 15. Several second auxiliary gas channels 17 communicating with the second baffle channel 14 are provided on the inner end partition 12 corresponding to the position of the second baffle channel 14. Several first temperature measuring points 18 for measuring the wall temperature of the burner sleeve 1 are provided on the inner side of the burner sleeve 1; several second temperature measuring points 19 for measuring the wall temperature of the secondary sleeve 4 are provided on the inner side of the secondary sleeve 4, and the second temperature measuring points 19 are located in front of the burner sleeve 1. The combustion stabilizing part 11 is a combustion stabilizing tooth.

[0023] The pulverized coal burner 2 includes an air-coal inlet 20, a tapered tube 21 with a gradually increasing cross-sectional area is provided on one side of the air-coal inlet 20, an ignition fuel gun 22 extending into the tapered tube 21 is provided in the middle of the air-coal inlet 20, and a cyclone separator 23 is provided on the side of the tapered tube 21 away from the tapered tube 21.

[0024] During stable combustion burner operation, pulverized coal and air carrying the pulverized coal are introduced into pulverized coal burner 2 and burned in burner sleeve 1. The pulverized coal then flows out into secondary sleeve. At this time, supplementary air is introduced, that is, external air supply enters the front position of burner sleeve 1 through the first flow channel 6, the first baffle channel 13, the second flow channel 7, the second baffle channel 14, and the third flow channel 8, and mixes to continue combustion. Stable combustion of pulverized coal in burner sleeve 1 is ensured by controlling the air flow rate in the first auxiliary gas channel, which can be reflected by the temperature stability of the first temperature measuring point 18. The temperature at the second temperature measuring point 19 is adjusted by controlling the air flow rate in the second auxiliary gas channel to avoid coking and slagging in the outlet area.

[0025] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A coking resistant low load stable burner characterized by: The device includes a burner sleeve, inside which a pulverized coal burner is installed; an air supply unit is provided on the outside of the burner sleeve, the air supply unit includes a cooling air sleeve sleeved on the outside of the burner, a secondary sleeve is provided on the inside of the cooling air sleeve, and an intermediate partition sleeve is provided between the cooling air sleeve and the secondary sleeve so that air passes sequentially through a first flow channel between the cooling air sleeve and the intermediate partition sleeve, a second flow channel between the intermediate partition sleeve and the secondary sleeve, and a third flow channel between the secondary sleeve and the burner sleeve, and then communicates with the space on the side of the burner sleeve away from the pulverized coal burner.

2. A low-maintenance stable flame burner according to claim 1, wherein: The cooling air sleeve extends beyond the burner sleeve at one end away from the pulverized coal burner. An outer end baffle is provided at the end of the cooling air sleeve and the secondary sleeve away from the burner sleeve. The other end of the secondary sleeve extends into the inner side of the burner sleeve. An annular inflow channel is formed at the end between the outer side of the secondary sleeve and the burner sleeve. A combustion stabilizing part is provided in the annular inflow channel. An inner end baffle is provided between the cooling air sleeve and the burner sleeve. One end of the intermediate spacer sleeve is connected to the inner end baffle, and the other end of the intermediate spacer sleeve is spaced apart from the outer end baffle by a first deflection channel. A second deflection channel is spaced apart between the secondary sleeve and the inner end baffle.

3. A low-maintenance stable flame burner according to claim 2, wherein: The combustion stabilizing sections are not uniformly distributed; there are no fewer than three combustion stabilizing sections, which are evenly distributed in the upper half of the annular inflow channel.

4. A low-maintenance stable flame burner according to claim 2, wherein: An inner support plate is provided on the inner side of the burner sleeve, and the pulverized coal burner is fixedly mounted on the inner support plate. Several first auxiliary gas channels communicating with the burner sleeve are provided on the inner support plate.

5. A low-maintenance stable flame burner according to claim 2, wherein: The inner end partition is provided with several second auxiliary air channels that are connected to the second baffle channel at the position corresponding to the second baffle channel.

6. A low-maintenance stable flame burner according to claim 2, wherein: The inner side of the burner sleeve is provided with several first temperature measuring points for measuring the burner sleeve wall temperature; the inner side of the secondary sleeve is provided with several second temperature measuring points for measuring the secondary sleeve wall temperature, and the second temperature measuring points are located in front of the burner sleeve.

7. A low-maintenance stable flame burner according to claim 2, wherein: The flame-stabilizing part is a flame-stabilizing tooth.

8. A low-maintenance stable flame burner according to claim 1, wherein: The pulverized coal burner includes an air-coal inlet, a tapered tube with a gradually increasing cross-sectional area on one side of the air-coal inlet, an ignition fuel gun extending into the tapered tube in the middle of the air-coal inlet, and a cyclone separator on the side of the tapered tube away from the tapered tube.

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