Combustion burner adaptive to coal with strong coking property

Abstract

The utility model discloses a combustion nozzle adaptive to coal with strong coking property. The combustion nozzle comprises a central air pipe, a primary air pipe and a primary air expansion cone connected to the front end of the primary air pipe, the inner wall of the front end of the primary air pipe is fixedly connected with more than two radial mounting blocks which are uniformly distributed in the circumferential direction, and each radial mounting block is fixedly connected with a flame segmentation block; more than two flame stabilizing teeth are arranged in the circumferential direction between the two flame dividing blocks, are fixedly connected with the primary air expanding cone and are positioned in front of the primary air pipe, and the inner ends of the flame stabilizing teeth are positioned on the radial inner side of the inner wall of the primary air pipe; according to the utility model, the disturbance of the pulverized coal airflow outlet can be enhanced, the flame perimeter length is increased, and the high-temperature flue gas backflow area and temperature of the combustor outlet are effectively controlled, so that the uniformity of pulverized coal airflow combustion is enhanced, the combustor outlet is prevented from coking, and the long-term safe and stable operation of the combustor is ensured.

Description

Technical Field

[0001] The utility model relates to a combustion nozzle, in particular to a combustion nozzle used for a swirl burner of a coal with strong coking property. Background Art

[0002] When conventional swirl burners are burning high-alkali coal with strong slagging properties and low ash melting point, problems such as coking near the burner nozzle and high furnace temperature levels often occur. At present, the solutions to the above operating problems mainly adopt control measures such as blending, adding soot blowers and increasing the size of the furnace, but these control measures can only slow down the contamination and cannot fundamentally solve the problem. It is difficult to meet the requirements for safe and economical operation of boilers burning high-alkali coal with strong slagging properties and low ash melting point. Summary of the invention

[0003] The purpose of the utility model is to provide a combustion nozzle suitable for coal with strong coking property in view of the above-mentioned deficiencies in the prior art, which can enhance the disturbance of the coal powder airflow outlet, increase the flame perimeter length, and effectively control the high-temperature flue gas recirculation area and temperature at the burner outlet, thereby enhancing the uniformity of the coal powder airflow combustion, avoiding coking at the burner outlet, and ensuring the long-term safe and stable operation of the burner.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a combustion nozzle suitable for highly coking coal, comprising a central air duct, a primary air duct and a primary air expansion cone connected to the front end of the primary air duct; it is characterized in that: two or more radial mounting blocks evenly distributed in the circumferential direction are fixedly connected to the inner wall of the front end of the primary air duct, and each radial mounting block is fixedly connected to a flame dividing block; more than two flame stabilizing teeth are arranged in the circumferential direction between the two flame dividing blocks, the flame stabilizing teeth are fixedly connected to the primary air expansion cone and are located in front of the primary air duct, and the inner end of the flame stabilizing tooth is located on the radial inner side of the inner wall of the primary air duct.

[0005] The above flame segmentation blocks are usually 3-6;

[0006] The utility model disperses the coal powder particles to more than two areas at the nozzle outlet for full combustion through the flame dividing block, and enhances the disturbance of the coal powder airflow outlet, so that the flame at the burner outlet is multi-fireball, which can increase the perimeter length of the flame, and is combined with the flame stabilizing teeth to effectively control the high-temperature flue gas reflow area and temperature at the burner outlet, thereby enhancing the uniformity of the coal powder airflow combustion, avoiding coking at the burner outlet, and ensuring the long-term safe and stable operation of the burner;

[0007] As a further improvement of the utility model, a radial groove is provided in the middle of each flame segmentation block, a radial mounting block is placed in the radial groove, the flame segmentation block and the radial mounting block are fixedly connected by screws passing through the two, and a plurality of tooth-shaped grooves are provided on both sides of the flame segmentation block; it is convenient to install and remove the flame segmentation block, and the tooth-shaped grooves on both sides can further enhance the disturbance of the coal powder airflow outlet and increase the flame perimeter length, thereby enhancing the uniformity of the coal powder airflow combustion;

[0008] As a further improvement of the utility model, the primary air expansion cone is connected to the front end of the primary air duct by connecting screws and nuts, and the front end of the central air duct is connected to its rear by pins; the front end of the central air duct, the flame stabilizing teeth and the flame dividing block are all made of silicon carbide ceramics; silicon carbide ceramics can improve the wear resistance and high temperature resistance of the components, thereby ensuring the long-term safe and stable operation of the burner; the primary air expansion cone and the front end of the central air duct are detachable structures, which are convenient for on-site replacement;

[0009] As a further improvement of the utility model, the primary air duct and the primary air expansion cone are both made of castings; this can improve the high temperature resistance and oxidation resistance of the burner nozzle;

[0010] As a further improvement of the utility model, the angle between the primary air expansion cone and the horizontal direction is a, a is 10-25°, and the expansion cone length H is 50-100mm; the angle and the expansion cone height adopt a small size structure, which can reduce the smoke recirculation area and control the flame length;

[0011] As a further improvement of the utility model, the flame stabilizing tooth and the primary air expansion cone are provided with matching limiting steps, and a baffle is fixedly provided on the primary air expansion cone outside the flame stabilizing tooth; this facilitates the installation and removal of the flame stabilizing tooth;

[0012] As a further improvement of the utility model, the width w of the flame stabilizing tooth is 100-150 mm, and the height h is 80-150 mm; the suitable parameters of the flame stabilizing tooth can enhance the uniformity of the combustion of the pulverized coal airflow;

[0013] In summary, the utility model can enhance the disturbance of the coal powder airflow outlet, increase the flame perimeter length, and effectively control the high-temperature flue gas recirculation area and temperature at the burner outlet, thereby enhancing the uniformity of coal powder airflow combustion, avoiding coking at the burner outlet, and ensuring long-term safe and stable operation of the burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the front view of the embodiment of the utility model.

[0015] Figure 2 for Figure 1 K-direction view.

[0016] Figure 3 for Figure 1 BB cross-sectional view.

[0017] Figure 4 for Figure 3 CC cross-sectional view.

[0018] Figure 5 for Figure 2 Enlarged view of the center flame stabilization tooth. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings.

[0020] like Figures 1 to 5 As shown, a combustion nozzle adapted to strong coking coal of this embodiment comprises a central air duct 1, a primary air duct 2 and a primary air expansion cone 3 connected to the front end of the primary air duct, the front end 1b of the central air duct is connected to the central air duct 1 at its rear by a pin 4, the primary air expansion cone 3 is connected to the front end of the primary air duct 2 by a connecting screw 5 and a nut, the angle a between the primary air expansion cone 3 and the horizontal direction is 15°, and the expansion cone length H is 60mm; four radial mounting blocks 6 uniformly distributed in the circumferential direction are welded and fixedly connected to the inner wall of the front end of the primary air duct 2, each radial mounting block is equipped with a flame dividing block 7, a radial groove 8 is provided in the middle of each flame dividing block 7, the radial mounting block 6 is placed in the radial groove 8, the flame dividing block 7 is fixedly connected to the radial mounting block 6 by a screw 9 passing through the two, and a plurality of tooth-shaped grooves 10 are provided on both sides of the flame dividing block 7; the two flame dividing blocks Two flame-stabilizing teeth 11 are arranged on the circumference between 7, and the flame-stabilizing teeth 11 are provided with matching limiting steps with the primary air expansion cone 3. A baffle 12 is fixedly arranged on the primary air expansion cone 3 outside the flame-stabilizing teeth 11 by screws. The flame-stabilizing teeth 11 are located in front of the primary air duct 2, and the inner end of the flame-stabilizing teeth 11 is located on the radial inner side of the inner wall of the primary air duct. The width w of the flame-stabilizing teeth 11 is 100-150mm, and the height h is 80-150mm; the front end 1b of the central air duct, the flame-stabilizing teeth 11 and the flame dividing block 7 are all made of silicon carbide ceramics, and the primary air duct 2 and the primary air expansion cone 3 are all made of castings;

[0021] The utility model disperses the coal powder particles at the nozzle outlet to four quadrants for full combustion through the flame dividing block 7, and cooperates with a plurality of tooth-shaped grooves 10 to enhance the disturbance of the coal powder airflow outlet, so that the flame at the burner outlet is multi-fireball, which can increase the perimeter length of the flame, and is combined with the flame stabilizing tooth 11 to effectively control the high-temperature flue gas recirculation area and temperature at the burner outlet, thereby enhancing the uniformity of the coal powder airflow combustion, avoiding coking at the burner outlet, and ensuring the long-term safe and stable operation of the burner; the angle a and the expansion cone height H are small in size, which can reduce the flue gas recirculation area and control the flame length; the primary air expansion cone 3, the flame dividing block 7, the flame stabilizing tooth 11 and the front end 1b of the central air duct are detachable structures, which are convenient for on-site replacement;

[0022] Silicon carbide ceramics can improve the wear resistance and high temperature resistance of the front end 1b of the central air duct, the flame stabilizing teeth 11 and the flame dividing block 7. The primary air duct 2 and the primary air expansion cone 3 made of casting material can improve the high temperature resistance and oxidation resistance of the burner nozzle, which can ensure the long-term safe and stable operation of the burner.

[0023] The above embodiments have been described, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments.

Claims

1. A combustion burner adapted to strong coking coal, comprising a central air duct, a primary air duct and a primary air expansion cone connected to the front end of the primary air duct; characterized in that: Two or more radial mounting blocks evenly distributed in the circumferential direction are fixedly connected to the inner wall at the front end of the primary air duct, and each radial mounting block is fixedly connected to a flame dividing block; two or more flame stabilizing teeth are provided in the circumferential direction between the two flame dividing blocks, and the flame stabilizing teeth are fixedly connected to the primary air expansion cone and located in front of the primary air duct, and the inner end of the flame stabilizing teeth is located on the radial inner side of the inner wall of the primary air duct.

2. A combustion nozzle adapted to strong coking coal as claimed in claim 1, characterized in that: A radial groove is arranged in the middle of each flame dividing block, and a radial mounting block is placed in the radial groove. The flame dividing block and the radial mounting block are fixedly connected by screws passing through the two, and a plurality of tooth-shaped grooves are arranged on both sides of the flame dividing block.

3. A combustion nozzle adapted to strong coking coal as claimed in claim 1 or 2, characterized in that: The primary air expansion cone is connected to the front end of the primary air duct through connecting screws and nuts, and the front end of the central air duct is connected to its rear through pins; the front end of the central air duct, the flame stabilizing teeth and the flame dividing block are all made of silicon carbide ceramics.

4. A combustion nozzle adapted to strong coking coal as claimed in claim 3, characterized in that: The primary air duct and the primary air expansion cone are both made of castings, which improves the high temperature resistance and oxidation resistance of the burner nozzle.

5. A combustion nozzle adapted to strong coking coal as claimed in claim 4, characterized in that: The angle between the primary air expansion cone and the horizontal direction is a, a is 10-25°, and the expansion cone length H is 50-100 mm.

6. A combustion nozzle adapted to strong coking coal as claimed in claim 5, characterized in that: The flame stabilizing tooth and the primary air expansion cone are provided with matching limiting steps, and a baffle is fixedly provided on the primary air expansion cone outside the flame stabilizing tooth.

7. A combustion nozzle adapted to strong coking coal as claimed in claim 6, characterized in that: The width w of the flame stabilizing tooth is 100-150 mm, and the height h is 80-150 mm.

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