Fan flame combustion equipment

Abstract

The present invention is in the technical field of kiln combustion equipment, and specifically relates to fan-shaped flame combustion equipment. Compared with the prior art, the fan-shaped flame combustion equipment of the present invention has a burner provided with two main gas nozzles, and the two main gas nozzles are provided with gas lateral spray holes respectively arranged along opposite outer directions, and the furnace wall is provided with a combustion air nozzle on the path of each main gas nozzle generating the main gas jet, so that the main gas jet generated by the main gas nozzle along the lateral direction is mixed with the combustion air flow generated by the combustion air nozzle when flowing through the combustion air nozzle and its outer side after being transported for a distance, so as to form a long-distance sprayed fan-shaped flame. This method of mixing the main gas jet ejected laterally with the combustion air flow can better avoid the phenomenon of direct flame impacting the heated material when the gas adjustment range is low, and avoids the problem of small flame adjustment range caused by insufficient centrifugal force due to low rotating air flow speed, thereby ensuring the stability and reliability of the fan-shaped flame.

Description

Technical Field

[0001] The invention belongs to the technical field of kiln combustion equipment, and in particular relates to fan-shaped flame combustion equipment. Background Art

[0002] In some specific heating furnaces, since the distance between the heated material and the furnace wall is relatively close, in order to avoid the high-temperature flame directly impacting and heating the material and causing damage, the flame must pass through and burn in the narrow gap between the furnace wall and the material. Therefore, a burner that can produce a flat flame is required.

[0003] Traditional flat flame burners can produce flat disc-shaped flames. The principle is to rely on the strong centrifugal force of the strong swirl generated by air and gas, and the airflow wall attachment effect generated by the curved flame channel to extend the flame into a disc shape attached to the furnace wall.

[0004] Flat flame burners have certain limitations, such as: small adjustment range; when the rotating airflow speed (momentum) is lower than the critical value, the centrifugal force is insufficient and the burner loses its wall adhesion ability, becoming a straight flame that directly impacts the heated material. Therefore, the flat flame effect of the flat flame burner is not reliable in situations where the load changes and the adjustment is frequent. Summary of the invention

[0005] The purpose of the present invention is to overcome the problems of existing flat flame burners, such as a small flame adjustment range and the problem that when the rotating air flow speed is low, the flame is prone to insufficient centrifugal force, resulting in loss of wall attachment ability and becoming a straight flame, so that the flame directly impacts the heated material. The present invention provides a fan flame combustion device that is arranged by arranging gas lateral spray holes arranged along the outer direction of the main gas nozzle and arranging combustion air nozzles on the furnace wall to achieve lateral spraying of the main gas jet and mixing with the combustion air flow to form a fan flame with a large adjustment ratio and a long spray distance.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A fan-shaped flame combustion device comprises a burner and a furnace wall; the burner comprises a flame-stabilizing igniter and at least two main gas nozzles arranged around the periphery of the flame-stabilizing igniter, the main gas nozzle is provided with gas lateral spray holes arranged along the outer direction, and the gas lateral spray holes of at least two main gas nozzles are arranged symmetrically; the furnace wall is provided with a mounting hole for accommodating the burner, the burner is installed in the mounting hole, the main gas nozzle extends out of the outside of the furnace wall, the furnace wall is located on the outside of the burner and is provided with a combustion-supporting air nozzle corresponding to each gas nozzle, and the gas lateral spray holes are used to generate a main gas jet flowing through the combustion-supporting air nozzle and the outside of the nozzle.

[0008] Compared with the prior art, the fan-shaped flame combustion equipment of the present invention has a burner with two main gas nozzles, and the two main gas nozzles are provided with gas lateral spray holes respectively arranged along opposite outer directions, and a combustion air nozzle is arranged on the furnace wall on the path of each main gas nozzle generating the main gas jet, so that the main gas jet generated by the main gas nozzle along the lateral direction is mixed with the combustion air flow generated by the combustion air nozzle when it flows through the combustion air nozzle and its outer side after being transported for a distance, so as to form a fan-shaped flame with a long distance spraying. This method of mixing the main gas jet ejected laterally with the combustion air flow can better avoid the phenomenon of direct flame impacting the heated material when the gas adjustment range is low, and avoids the problem of small flame adjustment range caused by insufficient centrifugal force due to low rotating air flow speed, thereby ensuring the stable operation and reliable use of the fan-shaped flame.

[0009] Furthermore, each of the main gas nozzles is provided with a plurality of the gas side spray holes, and the plurality of gas side spray holes are arranged adjacent to each other and surround the outer periphery of the main gas nozzle, and the angle between the axes of two gas side spray holes adjacently arranged in the circumferential direction of the main gas nozzle is 30° to 80°; through such an arrangement, a plurality of gas side spray holes are provided along the circumferential direction, and can be distributed at a certain angle with the axis of the main gas nozzle as the center, thereby forming a fan-shaped flame with a larger angle range, and forming a complete fan-shaped flame with a larger heating area.

[0010] Furthermore, at least two gas side spray holes are provided along the length direction of the corresponding main gas nozzle, and the angle between the two gas side spray holes adjacently arranged in the length direction of the main gas nozzle is 0° to 80°; through such an arrangement, multiple gas side spray holes are arranged along the axial direction, so that the thickness and length of the flame can be set according to requirements.

[0011] Furthermore, the main gas nozzle is provided with a plurality of flame propagation holes arranged along the circumferential direction between the gas lateral spray hole adjacent to the flame stabilizing igniter and the flame stabilizing igniter; through such an arrangement, the gas sprayed from the flame propagation hole is mixed with the air and a row of propagation flames is formed under the ignition action of the flame stabilizing igniter and transmitted to the gas lateral spray hole, thereby ensuring that the main gas jet sprayed from the gas lateral spray hole is ignited.

[0012] Furthermore, the angle between the gas side spray hole and the radial direction of the main gas nozzle is 0° to 70°; the angle between the gas side spray hole and the furnace wall is 0° to 80°; through such an arrangement, the gas side spray hole is arranged to form a certain angle with the furnace wall surface, thereby reducing thermal erosion on the furnace wall surface.

[0013] Furthermore, there are two main gas nozzles, which are symmetrically arranged on both sides below the flame stabilizing igniter; through such an arrangement, the main gas jets formed by the gas lateral spray holes at different angles of the two main gas nozzles respectively constitute a fan-shaped flame area with a certain angle coverage range, and the main gas nozzles and their gas lateral spray holes form a symmetrical left-right layout, so that the heated object is heated symmetrically on both sides.

[0014] Furthermore, the flame-stabilizing igniter comprises an ignition electrode and an ignition gas burner; the ignition gas burner comprises an ignition gas nozzle and an air delivery portion arranged radially around the ignition gas nozzle, the air delivery portion comprises an air-fuel premixing air disk and an air-fuel flame-stabilizing air disk arranged in sequence along its gas delivery direction; the air-fuel premixing air disk is circumferentially provided with a plurality of premixing air holes arranged along the axial direction, the air-fuel flame-stabilizing air disk is circumferentially provided with a plurality of flame-stabilizing air holes arranged along the axial direction, the flame-stabilizing air holes and the premixing air holes are relatively staggered in the axial direction, the ignition gas burner is provided with a radially arranged premixing gas nozzle between the air-fuel premixing air disk and the air-fuel flame-stabilizing air disk, the premixing gas nozzle The gas nozzle is used to convey the premixed gas jet and mix it with the premixed air jet conveyed by the premixing air hole to form a premixed air-fuel jet discharged through the flame-stabilizing air hole; the outer periphery of the ignition gas burner is located outside the air-fuel and flame-stabilizing air disk and is provided with an ignition gas radial nozzle and an ignition gas angle nozzle, respectively, the ignition gas radial nozzle and the ignition gas angle nozzle are used to convey the ignition gas jet and mix it with the premixed air-fuel jet discharged through the flame-stabilizing air hole to form a stable flame ignition area when the igniter is ignited; through such a setting, the flame-stabilizing igniter is provided to provide the duty flame for igniting the main gas nozzle, and works synchronously with the main gas spray gun to ensure the stable and reliable operation of the flame. At the same time, the flame-stabilizing igniter has a large adjustment range, can adapt to various harsh use environments, and can resist large changes in furnace pressure and interference from the main flame.

[0015] Furthermore, the flame-stabilizing igniter also includes an ignition tube, the ignition electrode, the ignition gas burner and the air delivery part are arranged in the ignition tube, the air-fuel premixing air disk is connected to the outer periphery of the ignition gas burner, and a premixing air annular gap is formed between the outer end of the air-fuel premixing air disk and the ignition tube, and the premixing air jet delivered by the premixing air annular gap is mixed with the premixing gas jet delivered by the premixing gas nozzle to form a premixed air-fuel jet discharged through the flame-stabilizing air hole; through such an arrangement, annular gap-type premixed air jets are generated through the premixing air annular gap, and small streams of premixed air jets are generated by the premixing air annular gap, and the large flame-stabilizing air holes and small flame-stabilizing air holes of the flame-stabilizing air disk are coordinated to produce premixed air-fuel jets with different gas concentrations between the air-fuel premixing air disk and the air-fuel flame-stabilizing air disk, thereby improving the stability and reliability of the stable flame ignition zone.

[0016] Furthermore, the flame-stabilizing wind holes include small flame-stabilizing wind holes located radially inward and large flame-stabilizing wind holes located radially outward, and the small flame-stabilizing wind holes and the large flame-stabilizing wind holes are respectively staggered relative to the premixing air annular gap and the premixing wind holes; through such an arrangement, the travel and time of the premixing air holes and the premixing air annular gap generated by the premixing air holes and the premixing air annular gap and discharged from the air-fuel flame-stabilizing wind disk are effectively extended, so that the premixed air-fuel jet can be better mixed with the premixed gas jet discharged from the premixing gas nozzle, and the flame stabilization and reliability of the flame ignition zone are better.

[0017] Furthermore, it also includes a gas delivery part connected to the inner side of the ignition gas burner, and the gas delivery part includes a gas output channel connected to the ignition gas burner and an air output channel connected to the air delivery part. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the burner.

[0019] Figure 2 A side view of the burner.

[0020] Figure 3 A cross-sectional view of the burner.

[0021] Figure 4 This is a cross-sectional view of the flame stabilizing igniter in the burner.

[0022] Figure 5 for Figure 4 Cross-sectional view along the BB direction.

[0023] Figure 6 This is the cross-sectional view along the AA direction in 4.

[0024] Figure 7 Schematic diagram of the main gas nozzle.

[0025] Figure 8 Schematic diagram of fan flame combustion equipment.

[0026] Fig. 9 Schematic diagram of the burner combustion state.

[0027] Fig.10 It is a side view of the burner in the combustion state.

[0028] Explanation of reference numerals: burner 1, furnace wall 2, flame stabilizing igniter 3, main gas nozzle 4, gas lateral spray hole 41, main gas delivery section 42, main gas inlet 421, mounting hole 21, combustion air nozzle 22, flame propagation hole 44, gas output section 45, ignition electrode 6, ignition gas burner 301, ion flame monitoring electrode 5, ignition gas nozzle 31, air delivery section 302, air-fuel premixing air disk 32, air-fuel flame stabilizing air disk 33, premixing air hole 321, premixing gas nozzle 311, ignition gas radial nozzle 312, ignition gas inclination nozzle 313, stable flame ignition area 34, ignition tube 35, premixing air annular seam 322, flame stabilizing small air hole 332, flame stabilizing large air hole 333, gas delivery section 36, gas output channel 361, air output channel 362, ignition gas inlet 363, ignition air inlet 364. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is described below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 to the present invention.

[0030] See also Figures 1 to 10 The fan-shaped flame combustion device of the present invention comprises a burner 1 and a furnace wall 2; the burner 1 comprises a flame stabilizing igniter 3 and at least two main gas nozzles 4 arranged around the outer periphery of the flame stabilizing igniter 3, the outer end of the main gas nozzle 4 is provided with a gas lateral spray hole 41 arranged along the radial outer direction, the gas lateral spray holes 41 of at least two main gas nozzles 4 are arranged symmetrically, and each main gas nozzle 4 is provided with a main gas delivery part 42 for delivering main gas on the inner side, the main gas delivery part 42 is used to provide gas to the main gas nozzle 4 and the gas lateral spray holes 41, and a main gas inlet 421 is provided at one end of the main gas delivery part 42; the furnace wall 2 is provided with a mounting hole 21 for arranging the burner 1, the burner 1 is installed in the mounting hole 21, the outer end of the main gas nozzle 4 extends out of the outside of the furnace wall 2, the furnace wall 2 is located on the outer side of the burner 1 and is provided with a combustion air nozzle 22 corresponding to each gas nozzle, and the gas lateral spray holes 41 are used to generate a main gas jet flowing through the combustion air nozzle 22 and the outside thereof. The gas side spray holes 41 may be circular or flat, and the length direction of the flat gas side spray holes 41 is arranged along the circumferential direction of the main gas nozzle 4 .

[0031] Compared with the prior art, in the fan-shaped flame combustion equipment of the present invention, the burner 1 is provided with two main gas nozzles 4, and the two main gas nozzles 4 are provided with gas lateral spray holes 41 respectively arranged along opposite outer directions, and the furnace wall 2 is provided with a combustion air nozzle 22 on the path of each main gas nozzle 4 to generate the main gas jet, so that the main gas jet generated by the main gas nozzle 4 along the lateral direction, after being transported for a distance, flows through the combustion air nozzle 22 and the outer side thereof, and is mixed with the combustion air flow generated by the combustion air nozzle 22 to form a long-distance sprayed fan-shaped flame. This method of mixing the main gas jet ejected laterally with the combustion air flow can better avoid the phenomenon of direct flame impacting the heated material when the gas adjustment range is low, and avoids the problem of a small flame adjustment range caused by insufficient centrifugal force due to the low rotating air flow speed, thereby ensuring the stable operation and reliable use of the fan-shaped flame.

[0032] The main gas nozzle 4 extends out of the flame stabilizing igniter 3 in the axial direction, and the gas lateral spray holes 41 are staggered in the circumferential direction from the direction in which the main gas nozzle 4 generates flames.

[0033] See also Figures 7 to 10 In one embodiment, each of the main gas nozzles 4 is provided with a plurality of the gas side spray holes 41, and the plurality of gas side spray holes 41 are arranged adjacent to each other and surround the outer periphery of the main gas nozzle 4. The gas side spray holes 41 are provided with at least two or at least two rows along the circumferential direction, and the angle between the axes of two gas side spray holes 41 adjacently arranged in the circumferential direction of the main gas nozzle 4 is 30° to 80°; through such an arrangement, a plurality of gas side spray holes 41 are provided along the circumferential direction, and the gas side spray holes 41 can be arranged in two or three rows, for example, and can be distributed at a certain angle with the axis of the main gas nozzle 4 as the center, so as to form a fan-shaped flame with a larger angle range, and the complete fan-shaped flame has a larger heating area.

[0034] See also Figure 1 , Figure 2 and Figure 7 In one embodiment, at least one, at least two or at least one row of the gas side spray holes 41 are provided along the length direction of the corresponding main gas nozzle 4. The gas side spray holes 41 can be arranged in two rows or three rows, for example. The angle between two adjacent gas side spray holes 41 arranged in the length direction of the main gas nozzle 4 is 0° to 80°. By setting it in this way, a plurality of gas side spray holes 41 are arranged along the axial direction, so that the thickness and length of the flame can be set according to needs.

[0035] See also Figure 1 , Figure 2 and Figure 7In one embodiment, the main gas nozzle 4 may be provided with a plurality of flame propagation holes 44 arranged along the circumferential direction between the gas lateral spray hole 41 adjacent to the flame stabilizing igniter 3 and the flame stabilizing igniter 3; by such an arrangement, the gas sprayed from the flame propagation hole 44 is mixed with the air and a row of propagation flames is formed under the ignition action of the flame stabilizing igniter 3 and transmitted to the gas lateral spray hole 41, thereby ensuring that the main gas jet sprayed from the gas lateral spray hole 41 is ignited.

[0036] See also Figure 1 , Figure 2 and Figure 7 In one embodiment, the angle between the gas side spray hole 41 and the radial direction of the main gas nozzle 4 is 0° to 70°, and the angle between the gas side spray hole 41 and the furnace wall 2 is 0° to 80°; through such an arrangement, the gas side spray hole 41 is arranged to form a certain angle with the wall surface of the furnace wall 2, thereby reducing thermal erosion on the wall surface of the furnace wall 2.

[0037] See also Figure 1 , Figure 2 , Figures 8 to 10 In one embodiment, two main gas nozzles 4 are provided, which are symmetrically arranged on both sides below the flame stabilizing igniter 3; through such an arrangement, the main gas jets formed by the gas side spray holes 41 at different angles of the two main gas nozzles 4 respectively constitute a fan-shaped flame area with a certain angle coverage range, and the main gas nozzles 4 and their gas side spray holes 41 form a symmetrical left-right layout, so that the heated object is heated symmetrically on both sides.

[0038] See also Figure 7 In one embodiment, a conical gas output portion 45 is provided at the outer end of the main gas nozzle 4 , and the gas lateral spray holes 41 and the flame propagation holes 44 are arranged on the gas output portion 45 .

[0039] See also Figures 2 to 6In one embodiment, the flame stabilizing igniter 3 includes an ignition electrode 6, an ignition gas burner 301 and an ion flame monitoring electrode 5; the ignition gas burner 301 includes an ignition gas nozzle 31 and an air delivery portion 302 arranged around the radial outer periphery of the ignition gas nozzle 31, the ignition electrode 6 and the ion flame monitoring electrode 5 are symmetrically arranged on both sides of the ignition gas nozzle 31 and pass through the air delivery portion 302, the air delivery portion 302 includes an air-fuel premixing air disk 32 and an air-fuel stabilizing flame air disk 33 arranged in sequence along its gas delivery direction, the air-fuel stabilizing flame air disk 33 is axially located outside the air-fuel premixing air disk 32; the air-fuel premixing air disk 32 is circumferentially provided with a plurality of premixing air holes 321 arranged along the axial direction, the air-fuel stabilizing flame air disk 33 is circumferentially provided with a plurality of stabilizing flame air holes arranged along the axial direction, the flame stabilizing air holes and the premixing air holes 321 are relatively staggered in the axial direction, the ignition The gas burner 301 is located between the air-fuel premixing air disk 32 and the air-fuel stabilizing flame air disk 33 and is provided with radially arranged premixing gas nozzles 311, the premixing gas nozzles 311 are used to convey the premixed gas jet to mix with the premixed air jet conveyed by the premixing air hole 321 to form a premixed air-fuel jet discharged through the flame stabilizing air hole; the outer periphery of the ignition gas burner 301 is located outside the air-fuel stabilizing flame air disk 33 and is respectively provided with ignition gas radial nozzles 312 and ignition gas angle nozzles 313, the ignition gas radial nozzles 312 and ignition gas angle nozzles 313 are respectively used to convey the ignition gas jet to mix with the premixed air-fuel jet discharged through the flame stabilizing air hole to form a stable flame ignition zone 34 when the igniter is ignited; through such an arrangement, the flame stabilizing flame igniter 3 is provided to provide a duty flame for igniting the main gas nozzle 4, and works synchronously with the main gas spray gun to ensure stable and reliable flame operation. At the same time, the flame stabilizing igniter 3 has a large adjustment range, can adapt to various harsh use environments, and can resist large-scale furnace pressure changes and interference from the main flame.

[0040] See also Figures 2 to 6In one embodiment, the flame-stabilizing igniter 3 further comprises an ignition tube 35, the ignition electrode 6, the ignition gas burner 301 and the air delivery part 302 are arranged in the ignition tube 35, the air-fuel premixing air disk 32 is connected to the outer periphery of the ignition gas burner 301, and a premixing air annular gap 322 is formed between the outer end of the air-fuel premixing air disk 32 and the ignition tube 35, and the premixing air annular gap 322 is used to mix the premixed air jet delivered by the premixing gas nozzle 311 to form a premixed air-fuel jet discharged through the flame-stabilizing air hole; the flame-stabilizing air hole comprises a small flame-stabilizing air hole located radially inward. Hole 332 and large flame-stabilizing air holes 333 located radially outward, the small flame-stabilizing air holes 332 and the large flame-stabilizing air holes 333 are relatively staggered with the premixing air annular gap 322 and the premixing air holes 321 respectively; through such an arrangement, annular gap type premixed air jets are generated through the premixing air annular gap 322, small streams of premixed air jets are generated by the premixing air holes 321, and the large flame-stabilizing air holes 333 and the small flame-stabilizing air holes 332 staggered on the flame-stabilizing air disk, premixed air-fuel jets with different gas concentrations are manufactured between the air-fuel premixing air disk 32 and the air-fuel flame-stabilizing air disk 33, thereby improving the stability and reliability of the stable flame ignition zone 34.

[0041] See also Figures 2 to 6 In one embodiment, the flame-stabilizing wind holes include a small flame-stabilizing wind hole 332 located radially inward and a large flame-stabilizing wind hole 333 located radially outward, and the small flame-stabilizing wind hole 332 and the large flame-stabilizing wind hole 333 are respectively staggered relative to the premixing air annular gap 322 and the premixing wind hole 321; by such an arrangement, the travel and time of the premixing air-fuel jet generated by the premixing wind hole 321 and the premixing air annular gap 322 and discharged from the air-fuel flame-stabilizing wind disk 33 are effectively extended, so that the premixing air-fuel jet can be better mixed with the premixing gas jet discharged from the premixing gas nozzle 311, and the flame stabilization and reliability of the stable flame ignition zone 34 are better.

[0042] See also Figures 2 to 6 In one embodiment, it also includes a gas delivery portion 36 connected to the inner side of the ignition gas burner 301, the gas delivery portion 36 includes a gas output channel 361 connected to the ignition gas burner 301 and an air output channel 362 connected to the air delivery portion 302, and an ignition gas inlet 363 connected to the gas output channel 361 and an ignition air inlet 364 connected to the air output channel 362 are provided at the end of the gas delivery portion 36.

[0043] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. Fan-shaped flame combustion equipment, characterized in that: include: The burner comprises a flame stabilizing igniter and at least two main gas nozzles arranged around the periphery of the flame stabilizing igniter, the main gas nozzles are provided with gas lateral spray holes arranged along the outer direction, and the gas lateral spray holes of the at least two main gas nozzles are symmetrically arranged; The furnace wall is provided with a mounting hole for arranging the burner, the burner is installed in the mounting hole, the main gas nozzle extends out of the furnace wall, the furnace wall is located on the outside of the burner and each gas nozzle is provided with a combustion air nozzle, and the gas lateral nozzle hole is used to generate a main gas jet flowing through the combustion air nozzle and the outside thereof; Each of the main gas nozzles is provided with a plurality of gas side spray holes, which are arranged adjacent to each other and surround the outer periphery of the main gas nozzle; the angle between two gas side spray holes adjacently arranged in the circumferential direction of the main gas nozzle is 30° to 80°; The angle between the gas lateral spray hole and the furnace wall is 0° to 80°; When the burner is working, the main gas jet generated by the main gas nozzle in the lateral direction flows through the combustion air nozzle and its outer side after being transported for a distance and mixes with the combustion air flow generated by the combustion air nozzle to form a fan-shaped flame with a long distance spraying.

2. The fan-shaped flame combustion device according to claim 1, characterized in that: At least two gas lateral spray holes are provided along the length direction of the corresponding main gas nozzle.

3. The fan-shaped flame combustion device according to claim 2, characterized in that: The included angle between two gas lateral spray holes adjacently arranged in the length direction of the main gas nozzle is 0° to 80°.

4. The fan-shaped flame combustion device according to claim 1, characterized in that: The main gas nozzle is provided with a plurality of flame propagation holes arranged along the circumferential direction between the gas lateral spray hole adjacent to the flame stabilizing igniter and the flame stabilizing igniter; The angle between the gas lateral spray hole and the radial direction of the main gas nozzle is 0° to 70°.

5. The fan-shaped flame combustion device according to any one of claims 1 to 4, characterized in that: There are two main gas nozzles, which are symmetrically arranged on both sides below the flame stabilizing igniter.

6. The fan-shaped flame combustion device according to claim 1, characterized in that: The flame stabilizing igniter comprises an ignition electrode and an ignition gas burner; the ignition gas burner comprises an ignition gas nozzle and an air delivery portion arranged around the radial outer periphery of the ignition gas nozzle, the air delivery portion comprises an air-fuel premixing air disk and an air-fuel flame stabilizing air disk sequentially arranged along the gas delivery direction thereof; The air-fuel premixing air disk is provided with a plurality of premixing air holes arranged along the axial direction in the circumference, and the air-fuel stabilizing flame air disk is provided with a plurality of stabilizing flame air holes arranged along the axial direction in the circumference, and the stabilizing flame air holes and the premixing air holes are relatively staggered in the axial direction, and the ignition gas burner is provided with a radially arranged premixing gas nozzle between the air-fuel premixing air disk and the air-fuel stabilizing flame air disk, and the premixing gas nozzle is used to convey a premixed gas jet to mix with a premixed air jet conveyed by the premixing air hole to form a premixed air-fuel jet discharged through the stabilizing flame air hole; The outer periphery of the ignition gas burner is located outside the air-fuel stabilizing flame wind disk and is respectively provided with an ignition gas radial nozzle and an ignition gas inclined nozzle. The ignition gas radial nozzle and the ignition gas inclined nozzle are respectively used to transport the ignition gas jet and the premixed air-fuel jet discharged through the flame stabilizing wind hole to mix with each other to form a stable flame ignition zone when the igniter is ignited.

7. The fan-shaped flame combustion device according to claim 6, characterized in that: The flame-stabilizing igniter also includes an ignition tube, the ignition electrode, the ignition gas burner and the air delivery part are arranged in the ignition tube, the air-fuel premixing air disk is connected to the outer periphery of the ignition gas burner, and a premixing air annular gap is formed between the outer end of the air-fuel premixing air disk and the ignition tube, and the premixing air annular gap is used to mix the premixed air jet delivered by the premixing gas nozzle with the premixing gas jet delivered by the premixing gas nozzle to form a premixed air-fuel jet discharged through the flame-stabilizing air hole; The flame stabilizing air holes include small flame stabilizing air holes located radially inward and large flame stabilizing air holes located radially outward, and the small flame stabilizing air holes and the large flame stabilizing air holes are staggered relative to the premixing air annular gap and the premixing air holes respectively; It also includes a gas delivery part connected to the inner side of the ignition gas burner, and the gas delivery part includes a gas output channel communicated with the ignition gas burner and an air output channel communicated with the air delivery part.

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