Low-NOx gas burner

Abstract

The utility model provides a low NOx gas burner which comprises a refractory brick, an air bellow unit, an incandescent light, a main gas gun, a heat flux adaptive gun and an internal mixing flame stabilizing gun, the refractory brick is back to a furnace wall, and the air bellow unit is communicated with the refractory brick and conveys combustion air; a plurality of flame stabilizing steps are arranged on the front side of the refractory brick; the main gas gun is arranged on the front side of the refractory brick; the heat flux adaptive guns are respectively arranged on two sides of the top tuyeres of the refractory bricks; nozzles of the main fuel gas gun and the heat flux adaptive gun are used for spraying main fuel gas and auxiliary fuel gas to the multi-stage flame stabilizing table and the furnace wall at a high speed respectively; and nozzles of the incandescent light and the internal mixing flame stabilizing gun are arranged at the top tuyeres of the refractory bricks to ignite the main gas dispersed to the top tuyeres, and stable-state main flames are formed through combustion-supporting air to ignite the auxiliary gas towards the furnace wall so as to burn in the manner of being attached to the furnace wall. Therefore, the ultra-low NOx emission standard is realized while the heat flux control requirement of the ethylene cracking furnace is met.

Description

Technical Field

[0001] The utility model relates to a gas clean combustion technology, in particular to a low NOx fuel gas burner suitable for a high-temperature ethylene cracking furnace. Background Art

[0002] With the rapid development of the petrochemical and chemical industries, especially the accelerated expansion of the ethylene industry, more stringent environmental protection standards have been proposed for ethylene cracking furnace burner technology. Among them, the application demand for ultra-low NOx (nitrogen oxides) burners is becoming increasingly urgent, showing broad application potential.

[0003] At present, the existing burner technology usually reduces the generation of thermal NOx by suppressing the temperature of the flame area, thereby reducing pollutant emissions. However, if such existing technical solutions are directly applied to ethylene cracking furnaces, some problems will arise. For example, the conventional solution of suppressing the temperature of the flame area will disperse the flame shape, thereby interfering with the uniformity of heat distribution in the furnace and affecting the overall efficiency and control. Therefore, it is difficult to meet the use requirements of ethylene cracking furnaces.

[0004] At present, the average NOx emission level of ethylene cracking furnace burners in my country generally hovers around 80-100 mg / Nm³ (although the actual value fluctuates due to factors such as fuel type and cracking furnace operating status). Therefore, for newly built ethylene cracking furnaces, in order to meet environmental protection NOx emission requirements, most will be equipped with SCR modules to post-treat the flue gas and further remove the NOx content. However, for the huge stock of old ethylene cracking furnaces, the conditions for installing SCR modules are very limited, so upgrading the burners is one of the few solutions. Utility Model Content

[0005] Therefore, the main purpose of the utility model is to provide a low NOx gas burner to achieve ultra-low NOx emission standards while meeting the heat flux control requirements of the ethylene cracking furnace.

[0006] In order to achieve the above-mentioned object, according to one aspect of the utility model, a low NOx gas burner is provided, which comprises: refractory bricks, a bellows unit, a pilot lamp, a main gas gun, a heat flux adapter gun, and an internal mixing flame stabilizing gun, wherein the refractory bricks are backed against the furnace wall and are provided with a combustion-supporting air channel, and the bellows unit is connected with the combustion-supporting air channel to transport the combustion-supporting air;

[0007] The front side of the refractory brick is provided with a multi-level flame stabilizing step, and the main gas gun is arranged on the front side of the refractory brick; the heat flux adapter gun is arranged on both sides of the tuyere at the top of the refractory brick;

[0008] The nozzles of the main gas gun and the heat flux adapter gun respectively spray the main gas and the auxiliary gas at high speed toward the multi-stage flame stabilizing table and the furnace wall;

[0009] The nozzles of the pilot lamp and the internal mixing flame stabilizing gun are arranged at the tuyere on the top of the refractory bricks to ignite the main fuel gas diffused there, and form a stable main flame through the combustion-supporting air to ignite the auxiliary fuel gas toward the furnace wall to burn along the furnace wall.

[0010] In a possible preferred embodiment, the internal mixing flame stabilizing gun includes: an internal mixing gun head, a gas nozzle, and a fuel riser, wherein the gas nozzle is connected to the top of the fuel riser, a gun head bracket is extended from the outer wall of the gas nozzle, a mixing chamber is provided in the internal mixing gun head, a main flame nozzle connected to the mixing chamber is opened laterally on the upper part of the internal mixing gun head, and a central air inlet and an air inlet ring hole are provided on the bottom surface, the gas nozzle is suspended in the air through the support of the gun head bracket, and the nozzles of the gas nozzles are arranged at intervals toward the central air inlet of the internal mixing gun head.

[0011] In a possible preferred embodiment, flame indicating holes communicating with the mixing chamber are arranged at intervals on the circumference of the lower side wall of the internal mixing gun head.

[0012] In a possible preferred embodiment, the bellows unit includes: an air guide duct, a muffler, and an air regulating baffle, wherein the first end of the air guide duct is connected to the combustion-supporting air channel of the refractory bricks, and the second end is connected to the muffler, and the air regulating baffle is arranged in the air guide duct.

[0013] In a possible preferred embodiment, the bellows unit further comprises: a baffle, wherein the air guide duct is provided with a bending portion, and the baffle is arranged in the air guide duct near the bending portion.

[0014] In a possible preferred embodiment, the combustion-supporting air channel of the refractory brick is gradually narrowed from the bottom air outlet to the top air outlet.

[0015] In a possible preferred embodiment, two levels of flame stabilizing steps are provided on the front side of the refractory bricks.

[0016] In a possible preferred embodiment, a clamping wall is provided on the last flame stabilizing step on the front side of the refractory bricks to position and clamp the main gas gun.

[0017] In a possible preferred embodiment, the distances from the main gas gun nozzle to the nozzles of each heat flux adaptation gun are substantially equal, and the height of the main gas gun nozzle does not exceed the final flame stabilization step.

[0018] In a possible preferred embodiment, the nozzles of the main gas gun and the heat flux adapter gun are provided with spray holes distributed at a diffusion angle.

[0019] The low NOx gas burner provided by the utility model cleverly designs the structure of the refractory bricks and the internal mixing and stabilizing flame gun, as well as the arrangement positions of the pilot lamp, the main gas gun, the heat flux adapter gun, and the internal mixing and stabilizing flame gun relative to the refractory bricks, so that the main / auxiliary fuel gas can be mixed with the flue gas carrying the inert gas in the furnace before being ignited, and then mixed with the combustion-supporting air after being diluted, thereby reducing the intensity of the main flame combustion and lowering the peak temperature of the main flame to suppress the generation of NOx. At the same time, the heat flux adapter gun can also fill the area with low heat at the bottom of the main flame, so that the flame is evenly distributed along the furnace wall to increase the contact area with the furnace wall, thereby better meeting the distribution needs of the heat flux, thereby solving the compatibility of ultra-low NOx emissions and high-temperature processes, and is particularly suitable for ethylene cracking processes, significantly reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of the side section structure of the low NOx gas burner of the utility model;

[0022] Figure 2 This is a front structural schematic diagram of a low NOx gas burner of the utility model;

[0023] Figure 3 It is a schematic diagram of the side section structure of the low NOx gas burner of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of a low NOx gas burner from a top view of the present utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the low NOx gas burner of the utility model when viewed from above;

[0026] Figure 6-Figure 7 This is a schematic diagram showing the flow of flue gas and gas in the negative pressure area of ​​refractory bricks in the furnace of the utility model low NOx gas burner;

[0027] Figure 8 It is a schematic diagram of the side cross-section structure of the internal mixing flame stabilizing gun in the low NOx gas burner of the utility model;

[0028] Fig. 9 It is a schematic cross-sectional structure diagram of the BB side of the internal mixing flame stabilizing gun in the low NOx gas burner of the utility model.

[0029] Description of Reference Numerals

[0030] Refractory brick 1, bellows unit 2, pilot lamp 3, main gas gun 4, heat flux adapter gun 5, internal mixing flame stabilizing gun 6, furnace wall 9, combustion air channel 11, sandwich wall 12, main gas inlet 13, main gas branch pipe 14, main gas riser 15, first-level flame stabilizing step 16, second-level flame stabilizing step 17, air guide duct 21, muffler 22, air damper 23, baffle 24, pilot lamp gas inlet 31, pilot lamp riser 32, pilot lamp flame nozzle 33, main gas gun nozzle 41, heat flux adapter gun riser 51, heat flux adapter gun nozzle 52, auxiliary gas branch pipe 53, internal mixing gun head 61, gas nozzle 62, fuel riser 63, gun head bracket 64, mixing chamber 65, main flame nozzle 66, central air inlet 67, air inlet ring hole 68, flame indication hole 69, furnace 91, negative pressure zone 92, main fuel dispersion zone 1001, high temperature ignition zone 1002, combustion zone 1003. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply 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 utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. The terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0035] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "layout", "installation", "connection" and "connection" 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 indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances and in combination with the prior art. In addition, the embodiments of the present utility model and the features in the embodiments can be combined with each other without conflict. And one or more of the components in the diagram may be necessary or non-essential, and the relative position relationship between the components in the above diagram can be adjusted according to actual needs.

[0037] In order to meet the requirements of heat flux control of ethylene cracking furnace and achieve ultra-low NOx emission standards, such as Figures 1 to 7 As shown, the utility model provides a low NOx gas burner, an example of which includes: refractory bricks 1, a bellows unit 2, a permanent lamp 3, a main gas gun 4, a heat flux adapter gun 5, and an internal mixing flame stabilizing gun 6, wherein the refractory bricks 1 are backed against a furnace wall 9, and a combustion-supporting air channel 11 is provided therein, and the bellows unit 2 is connected to the combustion-supporting air channel 11 to transport combustion-supporting air.

[0038] Among them Figure 1As shown, in a preferred example, the bellows unit 2 includes: an air guide duct 21, a muffler 22, and an air regulating baffle 23, wherein the first end of the air guide duct 21 is connected to the combustion-supporting air channel 11 of the refractory brick 1, and the second end is connected to the muffler 22, and the air regulating baffle 23 is arranged in the air guide duct 21. The air regulating baffle 23 is preferably arranged at the air inlet position close to the muffler 22, so as to control the air intake in the air guide duct 21 by adjusting the position of the air regulating baffle 23.

[0039] The combustion air enters the air duct 21 through the gap space between the second end of the air duct 21 and the muffler 22. During this process, the muffler 22 can protect the noise of the air inlet and prevent irregular flows such as natural side winds from interfering with the combustion air with the required standard flow of the burner.

[0040] Furthermore, in some examples, the air guide duct 21 may be bent, for example Figure 1 The L-shaped air guide duct 21 shown in the figure will generate conduction resistance to the incoming air in the bending area of ​​the duct. Therefore, in an optional embodiment, the wind box unit 2 further includes: a baffle 24, wherein the baffle 24 is arranged near the bending part in the air guide duct 21. With this arrangement, after the combustion air passes through the air regulating baffle 23, it will flow through the baffle 24 for guidance, so that the combustion air enters the vertical area of ​​the air guide duct 21 with the minimum resistance, thereby reducing the deviation caused by the bend, and stably guiding the combustion air into the combustion air channel 11 of the refractory brick 1.

[0041] In addition, in order to make the air outlet from the top air port of the refractory brick 1 more stable, in an optional example, the combustion-supporting air channel 11 of the refractory brick 1 can be set to gradually narrow from the bottom air port to the top air port, thereby achieving a rectifying effect on the airflow in the combustion-supporting air channel 11.

[0042] Further, such as Figure 1 to Figure 2 , Figure 6 to Figure 7 As shown, in this example, the front side of the refractory brick 1 is provided with two levels of flame stabilizing steps, the main gas gun 4 is arranged on the front side of the refractory brick 1, close to the last level of flame stabilizing steps, and the nozzle of the main gas gun 4 does not exceed the height of the last level of steps. In addition, in an optional example, in order to stabilize the main gas gun 4, in an optional embodiment, a clamping wall 12 is provided on the last level of flame stabilizing steps on the front side of the refractory brick 1 to position and clamp the main gas gun 4.

[0043] Specifically, Figure 1 to Figure 2 As shown, in this example, the main gas is connected to the gas pipeline of the upstream device through the main gas inlet 13, and the main gas is transported to the main gas gun nozzle 41 through the main gas branch pipe 14 and the main gas riser 15, and is ejected through the main gas nozzle holes designed and arranged on the nozzle.

[0044] In an optional example, on the main gas gun nozzle 41, a part of the nozzle holes spray the main gas toward the first-level flame stabilizing step 16, and the other part of the nozzle holes spray the main gas toward the second-level flame stabilizing step 17, and these nozzle holes are distributed at a diffusion angle, so that the main gas is sprayed toward the main fuel dispersion area 1001 at a diffusion angle.

[0045] With this arrangement, when the main gas gun nozzle 41 sprays the main gas at a high speed toward the two-stage flame stabilizing platform, a negative pressure zone 92 can be formed at the nozzle, so that the flue gas in the furnace 91 can continuously fill the negative pressure zone 92, thereby attracting the flue gas in the furnace 91 and the main gas premixed gas to dilute the main gas. Thereafter, the premixed gas passes through the two-stage flame stabilizing steps while being deflected and diffused upward, thereby delaying its remixing with the combustion-supporting air flow flowing out of the top tuyere of the refractory brick 1, thereby reducing the intensity of combustion, reducing the peak temperature of the flame, and thus inhibiting the generation of NOx.

[0046] In addition, it should be noted that in other optional embodiments, technical personnel in this field can also adjust the number of flame stabilization steps according to actual needs, thereby adjusting the required degree of delayed mixing. Therefore, in this example, the two-stage flame stabilization steps do not limit the number of feasible steps, and technical personnel in this field can make adjustments according to actual conditions.

[0047] Further, such as Figures 1 to 3 As shown, the nozzles of the ever-burning lamp 3 and the internal mixing flame gun 6 are arranged at the top tuyere of the refractory brick 1, wherein the ever-burning lamp 3 is composed of a ever-burning lamp gas inlet 31, a ever-burning lamp riser 32, and a ever-burning lamp flame nozzle 33, and the ever-burning lamp flame nozzle 33 is facing the high-temperature ignition zone 1002 at the top of the refractory brick 1.

[0048] Among them Figures 8 to 9 As shown, in an optional example, the internal mixing flame stabilizing gun 6 includes: an internal mixing gun head 61, a gas nozzle 62, and a fuel riser 63, wherein the gas nozzle 62 is connected to the top of the fuel riser 63, and a gun head bracket 64 extends from the outer wall of the gas nozzle 62, a mixing chamber 65 is provided in the internal mixing gun head 61, and a main flame nozzle 66 connected to the mixing chamber 65 is opened laterally on the upper part of the internal mixing gun head 61, wherein the main flame nozzle 66 is directly facing the high-temperature ignition zone 1002 on the top of the refractory brick 1, and a central air inlet 67 and an air inlet ring hole 68 are provided on the bottom surface of the internal mixing gun head 61, wherein the air inlet ring hole 68 is circumferentially spaced around the central air inlet 67, and the gas nozzle 62 is suspended in the air by supporting the internal mixing gun head 61 through the gun head bracket 64, and the nozzle of the gas nozzle 62 is arranged at intervals toward the central air inlet 67 of the internal mixing gun head 61.

[0049] Specifically, when the fuel gas is transported to the fuel riser 63 through the connecting pipe, and is sprayed into the central air inlet 67 through the gas nozzle 62 and enters the internal mixing chamber 65 of the internal mixing gun head 61, the fuel sprayed by the gas nozzle 62 will draw air through its own kinetic energy, so that the combustion-supporting air can pass through the central air inlet 67 and the air inlet ring hole 68, enter the mixing chamber 65 of the internal mixing gun head 61 for mixing, and is ignited by the eternal lamp 3 to form a stable flame, and is sprayed from the main flame nozzle 66 to the top of the refractory brick 1 to form a high-temperature ignition zone 1002. At the same time, when the main fuel gas mixture diffuses here and mixes with the combustion-supporting air sprayed from the air outlet on the top of the refractory brick 1, when it is ignited in the high-temperature ignition zone 1002 on the top of the refractory brick 1, a stable main flame can be formed.

[0050] Furthermore, in an optional embodiment, in order to facilitate observation of the flame condition in the internal mixing gun head 61, flame indication holes 69 connected to the mixing chamber 65 are spaced apart on the circumference of the lower side wall of the internal mixing gun head 61. When the internal mixing stabilizing flame gun 6 is ignited, the working state of the internal mixing stabilizing flame gun 6 can be judged by observing the flame condition ejected from the flame indication holes 69.

[0051] With this setting, if Figure 6 to Figure 7 As shown, since the top tuyere of the refractory brick 1 will blow the combustion air upward, and the flue gas and fuel gas will also diffuse upward toward the furnace wall 9, the main flame will burn on the upper part of the refractory brick 1, and form a combustion area 1003 with the furnace wall 9, extending in the direction of the furnace wall 9, forming a flame attached to the wall. Therefore, under the premise of ensuring stable combustion, the inert flue gas is entrained to the maximum extent, and the mixing of the fuel and the combustion air is delayed, and the mixing intensity of the fuel and the combustion air is reduced, so that the fuel is first mixed with the flue gas to form a low-concentration mixed gas, and then mixed with the combustion air, so that the intensity of combustion can be reduced, thereby reducing the peak temperature of the flame and suppressing the generation of NOx.

[0052] Further, such as Figures 2 to 4 As shown, the heat flux adapter gun 5 is arranged on both sides of the top tuyere of the refractory brick 1. In this example, the distance from the main gas gun nozzle 41 to the nozzles of each heat flux adapter gun 5 is basically equal, and the height of the main gas gun nozzle 41 does not exceed the last flame stabilizing step, thereby forming an isosceles or equilateral triangle distribution shape with a drop, so as to diffuse the gas at different positions to provide a basis for designing the flame distribution shape.

[0053] Specifically, the auxiliary gas passes through the auxiliary gas branch pipe 53, and enters the heat flux adapter gun nozzle 52 through the heat flux adapter gun riser 51, wherein the nozzle is provided with spray holes, and the spray holes are distributed at a diffusion angle, so that the auxiliary gas is sprayed toward the furnace wall 9 at a diffusion angle and close to the lower part of the main flame.

[0054] The auxiliary fuel gas ejected from the nozzles 52 of the two heat flux adapter guns is mixed with the combustion-supporting air ejected through the air outlet on the top of the refractory brick 1. At this time, since there is a certain distance between the two heat flux adapter guns 5 and the combustion-supporting air channel 11, the fuel flow is not inside the air flow. Therefore, the fuel ejected from the two heat flux adapter guns 5 and the combustion-supporting air flowing out of the refractory brick 1 are not directly contacted and mixed. This delay will not affect the stability of the main flame, but can reduce the mixing intensity in the burner area.

[0055] At the same time, since the heat flux adapter gun nozzle 52 sprays the auxiliary fuel at a high speed, a negative pressure area 92 is generated at the nozzle position to attract the inert flue gas in the furnace 91 to fill the negative pressure area 92, that is, the high-speed jet fuel gas entrains the flue gas to dilute the concentration of the auxiliary fuel gas, so that the auxiliary fuel gas is mixed with the flue gas and then mixed with the combustion-supporting air to form a delayed mixing. In this way, the intensity of combustion can be reduced, the peak temperature of the flame can be reduced, and the generation of NOx can be suppressed.

[0056] On the other hand, since the fuel sprayed by the main gas gun 4 is not in the combustion-supporting air channel 11, after sucking in the inert flue gas in the furnace 91, the heat energy at the bottom of the main flame will be lower than that of the conventional flame. Therefore, the heat flux curve of the conventional flame design generally has a lower heat at the bottom. The heat energy of the auxiliary gas sprayed by the two heat flux adapter guns 5 in this example just fills the heat in the lower area at the bottom of the main gas flame, making the flame more evenly distributed along the furnace wall 9, increasing the contact area between the flame and the furnace wall 9, and eliminating the problem of local overheating and overcooling, so as to better meet the needs of the ethylene cracking process for heat flux distribution, maintain the optimal cracking conditions, and reduce NOx emissions.

[0057] Comparing the furnace temperature, oxygen content, NOx emissions, and heat flux of the existing technology application case with that of this case, the results are as follows:

[0058] Case comparison Furnace temperature ℃ Oxygen content% NOx emission mg / Nm³ Heat flux deviation from process requirements% Prior art 1100-1250 3 80-100 ≤10 Example of this case 1100-1250 3 50-70 ≤3

[0059] In summary, the low NOx gas burner provided by the utility model cleverly designs the structure of the refractory bricks 1 and the internal mixing and stabilizing flame gun 6, as well as the arrangement positions of the eternal lamp 3, the main gas gun 4, the heat flux adapter gun 5, and the internal mixing and stabilizing flame gun 6 relative to the refractory bricks 1, so that the main / auxiliary fuel gas can be mixed with the flue gas carrying inert gas in the furnace before being ignited, and then mixed with the combustion-supporting air after dilution, thereby reducing the intensity of the main flame combustion and lowering the peak temperature of the main flame to inhibit the generation of NOx. At the same time, the heat flux adapter gun 5 can also fill the area with low heat at the bottom of the main flame, so that the flame is evenly distributed along the furnace wall 9 to increase the contact area with the furnace wall 9, thereby better meeting the distribution needs of the heat flux, thereby solving the compatibility of ultra-low NOx emissions and high-temperature processes, and is particularly suitable for ethylene cracking processes, significantly reducing environmental pollution.

[0060] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can understand and use the utility model well. The utility model is only limited by the claims and their full scope and equivalents. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

[0061] In addition, various implementations of the embodiments of the present utility model can also be arbitrarily combined, as long as they do not violate the concept of the embodiments of the present utility model, they should also be regarded as the contents disclosed in the embodiments of the present utility model.

Claims

1. A low NOx gas burner, characterized in that include: Refractory bricks, bellows unit, pilot lamp, main gas gun, heat flux adapter gun, internal mixing flame stabilizing gun, wherein the refractory bricks are backed by the furnace wall and are provided with a combustion-supporting air channel, and the bellows unit is connected with the combustion-supporting air channel to transport the combustion-supporting air; The front side of the refractory brick is provided with a multi-level flame stabilizing step, and the main gas gun is arranged on the front side of the refractory brick; the heat flux adapter gun is arranged on both sides of the tuyere at the top of the refractory brick; The nozzles of the main gas gun and the heat flux adapter gun respectively spray the main gas and the auxiliary gas at high speed toward the multi-stage flame stabilizing table and the furnace wall; The nozzles of the pilot lamp and the internal mixing flame stabilizing gun are arranged at the tuyere on the top of the refractory bricks to ignite the main fuel gas diffused there, and form a stable main flame through the combustion-supporting air to ignite the auxiliary fuel gas toward the furnace wall to burn along the furnace wall.

2. The low NOx gas burner according to claim 1, characterized in that: The internal mixing flame stabilizing gun comprises: an internal mixing gun head, a gas nozzle, and a fuel riser, wherein the gas nozzle is connected to the top of the fuel riser, a gun head bracket is extended from the outer wall of the gas nozzle, a mixing chamber is arranged in the internal mixing gun head, a main flame nozzle connected to the mixing chamber is opened laterally on the upper part of the internal mixing gun head, and a central air inlet and an air inlet ring hole are arranged on the bottom surface, the gas nozzle is suspended in the air through the gun head bracket, and the nozzles of the gas nozzles are arranged at intervals toward the central air inlet of the internal mixing gun head.

3. The low NOx gas burner according to claim 2, characterized in that: Flame indicating holes communicating with the mixing chamber are arranged at intervals on the circumference of the lower side wall of the internal mixing gun head.

4. The low NOx gas burner according to claim 1, characterized in that: The bellows unit comprises: an air guide duct, a muffler, and an air regulating baffle, wherein the first end of the air guide duct is connected to the combustion-supporting air channel of the refractory brick, and the second end is connected to the muffler, and the air regulating baffle is arranged in the air guide duct.

5. The low NOx gas burner according to claim 4, characterized in that: The bellows unit further comprises: a baffle, wherein the air guide duct is provided with a bending portion, and the baffle is arranged in the air guide duct near the bending portion.

6. The low NOx gas burner according to claim 1, characterized in that: The combustion-supporting air passage of the refractory brick is gradually narrowed from the bottom air outlet to the top air outlet.

7. The low NOx gas burner according to claim 1, characterized in that: The front side of the refractory brick is provided with two levels of flame stabilizing steps.

8. The low NOx gas burner according to claim 1, characterized in that: A clamping wall is provided on the last flame stabilizing step on the front side of the refractory bricks to position and clamp the main gas gun.

9. The low NOx gas burner according to claim 1, characterized in that: The distances from the main gas gun nozzle to the nozzles of each heat flux adaptation gun are substantially equal, and the height of the main gas gun nozzle does not exceed the final flame stabilizing step.

10. The low NOx gas burner according to claim 1, characterized in that: The nozzles of the main gas gun and the heat flux adapter gun are provided with spray holes distributed at a diffusion angle.

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