Stable combustion burner

Abstract

The utility model discloses a stable combustion burner, relates to the technical field of boiler combustion, and mainly aims to improve the stable combustion capacity of a boiler when the boiler runs in a low-load state. According to the main technical scheme, the stable-combustion burner comprises a primary air powder pipe and a pre-combustion chamber, the pre-combustion chamber is arranged on the side, close to a hearth, of a first air pipe and communicated with the primary air powder pipe and the hearth, and a tiny-oil ignition assembly penetrating through the pre-combustion chamber is arranged in the pre-combustion chamber. A secondary air header pipe communicated with the pre-combustion chamber is arranged outside the pre-combustion chamber; the stable combustion burner further comprises a combustion-supporting gas pipe, the combustion-supporting gas pipe is communicated with the pre-combustion chamber, and the combustion-supporting gas pipe and the primary air powder pipe are arranged on the same side of the pre-combustion chamber.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of boiler combustion technology, and specifically relates to a stable combustion burner. BACKGROUND

[0002] With the continuous development of industry, burners are increasingly widely used in various fields. Traditional burners often have problems such as unstable combustion and difficult ignition during the combustion process. For example, in some combustion scenarios, due to the unreasonable design of the primary air powder pipe, the mixing effect of the air powder is poor, affecting the combustion efficiency and stability. At the same time, the lack of effective pre-chamber structure makes the ignition process not fast and reliable, and the combustion in the furnace is difficult to stabilize and continue.

[0003] In the existing technology, the burner usually only relies on the primary air powder pipe and the secondary air main pipe to realize combustion, but this way is difficult to meet the needs of efficient and stable combustion in some cases. Especially in some special working conditions, such as low load operation, the stability of combustion will be more challenging. SUMMARY

[0004] Therefore, the embodiments of the utility model provide a stable combustion burner, the main purpose of which is to improve the stable combustion capacity of the boiler when running at low load.

[0005] To achieve the above-mentioned purpose, the utility model mainly provides the following technical scheme:

[0006] The embodiments of the utility model provide a stable combustion burner, which comprises a primary air powder pipe and a pre-chamber arranged on the side of the first air pipe close to the furnace and connected with the primary air powder pipe and the furnace, the inside of the pre-chamber is provided with a micro-oil ignition assembly penetrating through the pre-chamber, and the outside of the pre-chamber is provided with a secondary air main pipe connected with the pre-chamber.

[0007] Among them, the stable combustion burner further comprises a combustion-supporting gas pipe, the combustion-supporting gas pipe is connected with the pre-chamber, and the combustion-supporting gas pipe and the primary air powder pipe are arranged on the same side of the pre-chamber.

[0008] Optionally, the combustion-supporting gas pipe is provided with a plurality of combustion-supporting gas pipes, and the plurality of combustion-supporting gas pipes are uniformly arranged along the circumferential direction of the primary air powder pipe.

[0009] Optionally, the secondary air main pipe is provided with a secondary air inlet pre-chamber rotational flow generator, and the secondary air inlet pre-chamber rotational flow generator is located at one end of the secondary air main pipe close to the pre-chamber.

[0010] Optionally, the stable combustion burner further comprises:

[0011] an inner secondary air pipe and an outer secondary air pipe;

[0012] The inner secondary air pipe is arranged at the outer circumferential side of the precombustion chamber, one end of the inner secondary air pipe is communicated with the secondary air main pipe, and the other end is communicated with the furnace.

[0013] The outer secondary air pipe is arranged at the outer circumferential side of the inner secondary air pipe, one end of the outer secondary air pipe is communicated with the secondary air main pipe, and the other end is communicated with the furnace.

[0014] Optionally, the inner secondary air pipe is provided with an inner secondary air into-furnace rotational flow generator, and the inner secondary air into-furnace rotational flow generator is located at one end of the inner secondary air pipe close to the furnace.

[0015] Optionally, the outer secondary air pipe is provided with an outer secondary air into-furnace rotational flow generator, and the outer secondary air into-furnace rotational flow generator is located at one end of the outer secondary air pipe close to the furnace.

[0016] Optionally, the micro-oil ignition assembly comprises:

[0017] The micro-oil oil gun, the micro-oil ignition gun and the micro-oil combustion-supporting air pipe.

[0018] The micro-oil oil gun and the micro-oil ignition gun are arranged in the micro-oil combustion-supporting air pipe and extend in the same direction as the micro-oil combustion-supporting air pipe.

[0019] Optionally, the micro-oil combustion-supporting air pipe is coaxially arranged with the precombustion chamber.

[0020] Optionally, the stable combustion burner further comprises:

[0021] The micro-oil combustion-supporting air supply pipe.

[0022] One end of the micro-oil combustion-supporting air supply pipe is communicated with the secondary air main pipe, and the other end is communicated with the micro-oil combustion-supporting air pipe.

[0023] Optionally, the stable combustion burner further comprises:

[0024] The burner nozzle.

[0025] The burner nozzle is arranged at one end of the precombustion chamber close to the furnace, and the cross-sectional area of the burner nozzle gradually increases in the direction of the precombustion chamber towards the furnace.

[0026] By means of the above technical scheme, the utility model at least has the following beneficial effects:

[0027] The stable combustion burner provided in the embodiment of the utility model, through setting up the micro oil ignition assembly, can provide concentrated and efficient ignition source for fuel at low load. Even if the boiler is in low load operation, the micro oil ignition assembly can ensure that the fuel is reliably ignited, laying a foundation for subsequent stable combustion. By setting up the combustion-supporting gas pipe, combustion-supporting gas can be introduced into the precombustion chamber under low load state, the combustion-supporting gas and the fuel are fully mixed in the precombustion chamber, jointly participate in the combustion process, and the combustion effect under low load can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structural schematic view of the stable combustion burner of an optional embodiment of the utility model.

[0029] The signs are represented as:

[0030] 1, primary air powder pipe; 2, precombustion chamber; 3, micro oil ignition assembly; 31, micro oil oil gun; 32, micro oil ignition gun; 33, micro oil combustion-supporting air pipe; 4, secondary air main pipe; 5, combustion-supporting gas pipe; 6, secondary air into precombustion chamber rotational flow generator; 7, inner secondary air pipe; 8, outer secondary air pipe; 9, inner secondary air into furnace rotational flow generator; 10, outer secondary air into furnace rotational flow generator; 11, micro oil combustion-supporting air supply pipe; 12, burner nozzle. DETAILED DESCRIPTION

[0031] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0032] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0033] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect, can be mechanical connection, also can be electrical connection, can be direct connection, also can indirectly connect through intermediate medium, can be two element internal communication. For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned terms in the utility model according to specific circumstances.

[0034] The preferred embodiments of the utility model are described below in conjunction with the drawings, and it should be understood that the preferred embodiments described here are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0035] Referring to Figure 1 As shown in the figure, according to the embodiment of the utility model, a stable combustion burner is provided, which comprises a primary air powder pipe 1 and a precombustion chamber 2 arranged on the side of the first air pipe close to the hearth and communicated with the primary air powder pipe 1 and the hearth, the inside of the precombustion chamber 2 is provided with a micro-oil ignition assembly 3 penetrating through the precombustion chamber 2, and the outside of the precombustion chamber 2 is provided with a secondary air main pipe 4 communicated with the precombustion chamber 2; wherein the stable combustion burner further comprises a combustion-supporting gas pipe 5, the combustion-supporting gas pipe 5 is communicated with the precombustion chamber 2, and the combustion-supporting gas pipe 5 and the primary air powder pipe 1 are arranged on the same side of the precombustion chamber 2.

[0036] By arranging the micro-oil ignition assembly 3, a concentrated and efficient ignition source can be provided for the fuel at low load. Even if the boiler is in low load operation, the micro-oil ignition assembly 3 can ensure that the fuel is reliably ignited, laying a foundation for subsequent stable combustion. By arranging the combustion-supporting gas pipe 5, combustion-supporting gas can be introduced into the precombustion chamber 2 at low load, the combustion-supporting gas and the fuel are fully mixed in the precombustion chamber 2, and jointly participate in the combustion process, which can effectively improve the combustion effect at low load.

[0037] The primary air powder pipe 1 is used for conveying a wind powder mixture, and the wind powder mixture is specifically air carrying fuel such as coal powder.

[0038] The primary air powder pipe 1 is communicated with the precombustion chamber 2, the precombustion chamber 2 is located on the side of the primary air powder pipe 1 close to the hearth, and the precombustion chamber 2 is also communicated with the hearth. In actual application, the primary air powder pipe 1 conveys the wind powder mixture into the precombustion chamber 2, and the wind powder mixture is fully mixed and prepared in the precombustion chamber 2.

[0039] Specifically, the wind-powder mixture and the combustion-supporting gas from the combustion-supporting gas pipe 5 intermingle with each other in the precombustion chamber 2, laying a good foundation for the upcoming combustion process. The micro-oil ignition assembly 3 penetrates the precombustion chamber 2 and provides a concentrated and efficient ignition source for the mixture of the wind-powder mixture and the combustion-supporting gas at the appropriate time, igniting the mixture instantaneously and triggering the initial combustion reaction. At the same time, the secondary air main pipe 4, which communicates with the precombustion chamber 2, timely introduces secondary air into the precombustion chamber 2 during the combustion process, lifts the scattered fuel in the precombustion chamber 2, and further promotes the deep integration of the wind-powder mixture and the combustion-supporting gas, laying a solid foundation for the subsequent efficient combustion in the hearth and ensuring that the entire combustion process is stable, reliable, and efficient.

[0040] The combustion-supporting gas can be a mixed gas containing 20% hydrogen. When the micro-oil ignition assembly 3 ignites the mixture of the wind-powder mixture and the combustion-supporting gas, the presence of 20% hydrogen helps to enhance the intensity and stability of the combustion, and the timely introduction of secondary air by the secondary air main pipe 4 further promotes the complete combustion of the mixture, ensuring that the entire combustion process is stable, reliable, and efficient.

[0041] Specifically, the combustion-supporting gas pipe 5, which delivers the combustion-supporting gas, is arranged on the same side of the precombustion chamber 2 as the primary wind-powder pipe 1, so that during the combustion process, the combustion-supporting gas and the wind-powder mixture can mix more quickly in the precombustion chamber 2. It should be noted that because the combustion-supporting gas and the wind-powder mixture come from the same side and are closer, the time and energy consumption required for mixing can be reduced. The combustion-supporting gas can intermingle with the wind-powder mixture more timely, laying a good foundation for the upcoming combustion process. When the micro-oil ignition assembly 3 ignites, the more fully mixed system can be ignited more quickly, triggering a more intense combustion reaction and improving the stability and efficiency of the combustion. In addition, it is also beneficial to the better functioning of the secondary air main pipe 4. When the secondary air blows up the fallen fuel in the precombustion chamber 2 and promotes the intermingling of the wind-powder mixture and the combustion-supporting gas, it can form a more coordinated cooperation with the combustion-supporting gas and the primary wind-powder from the same side, laying a solid foundation for the subsequent efficient combustion in the hearth.

[0042] The secondary air can be air, and introducing air into the precombustion chamber 2 can better mix the fuel and air, promoting the uniformity and stability of the combustion.

[0043] The ignition end of the micro-oil ignition assembly 3 is located at the outlet of the precombustion chamber 2, i.e., the ignition end of the micro-oil ignition assembly 3 is located at one end of the precombustion chamber 2 that communicates with the hearth, so that the combustion after ignition can be more smoothly transitioned from the precombustion chamber 2 to the hearth.

[0044] Specifically, in actual application, when the mixture of the pulverized coal and the combustion-supporting gas is fully mixed in the precombustion chamber 2 and gradually flows to the outlet direction, the ignition end located here can ignite the mixture at the critical moment when the mixture is about to enter the furnace. Since the mixture has been fully prepared and mixed in the precombustion chamber 2 at this time, the success rate and efficiency of ignition can be greatly improved. Once the ignition is successful, the high-temperature flame and the energy generated by combustion can be quickly transmitted to the furnace, providing a strong guarantee for the stable operation of the entire combustion system.

[0045] In some possible embodiments disclosed in the utility model, referring to Figure 1 It is shown that the combustion-supporting gas pipes 5 are arranged in the circumferential direction of the primary pulverized coal pipe 1. In this way, on the one hand, the contact between the combustion-supporting gas and the mixture of the pulverized coal and the air is more sufficient and uniform, greatly improving the quality and efficiency of the mixture; on the other hand, it can ensure that the distribution of the combustion-supporting gas in the precombustion chamber 2 is more balanced. When the micro-oil ignition assembly 3 ignites, the mixture system can be supported by the combustion-supporting gas in all directions, so that the combustion reaction is more stable and reliable, which helps to reduce the situation of local insufficient or unstable combustion and improve the overall stability of combustion.

[0046] Specifically, in this embodiment, the primary pulverized coal pipe 1 is arranged at the central end of the precombustion chamber 2, and the combustion-supporting gas pipes 5 are uniformly arranged around the primary pulverized coal pipe 1.

[0047] In some possible embodiments disclosed in the utility model, referring to Figure 1 It is shown that the secondary air main pipe 4 is provided with a secondary air precombustion chamber inlet swirl generator 6, and the secondary air precombustion chamber inlet swirl generator 6 is located at one end of the secondary air main pipe 4 close to the precombustion chamber 2.

[0048] By arranging the secondary air precombustion chamber inlet swirl generator 6, the secondary air can form a rotating air flow when entering the precombustion chamber 2, and the mixture of the pulverized coal and the air and the combustion-supporting gas can be more fully mixed under the driving of the rotating secondary air, creating more favorable conditions for the combustion process.

[0049] When the secondary air flows from the secondary air main pipe 4 to the precombustion chamber 2, it will first pass through the secondary air precombustion chamber inlet swirl generator 6, which is used to form a rotating flow state before the secondary air enters the precombustion chamber 2.

[0050] Specifically, when the secondary air enters the precombustion chamber 2 in the form of a rotating flow, it can better interact with the mixture of the pulverized coal and the air and the combustion-supporting gas in the precombustion chamber 2. The rotating secondary air can generate a centrifugal force, so that the distribution of the secondary air in the precombustion chamber 2 is more uniform, and at the same time, the mixing effect of the secondary air with the mixture of the pulverized coal and the air and the combustion-supporting gas can be enhanced.

[0051] In some possible implementation forms of the utility model, refer to Figure 1 As shown in the figure, the stable combustion burner further comprises: an inner secondary air pipe 7 and an outer secondary air pipe 8; the inner secondary air pipe 7 is arranged at the outer peripheral side of the precombustion chamber 2, one end of the inner secondary air pipe 7 is in communication with the secondary air main pipe 4, and the other end is in communication with the hearth; the outer secondary air pipe 8 is arranged at the outer peripheral side of the inner secondary air pipe 7, one end of the outer secondary air pipe 8 is in communication with the secondary air main pipe 4, and the other end is in communication with the hearth.

[0052] By arranging the inner secondary air pipe 7 and the outer secondary air pipe 8, the secondary air is sent into the hearth in stages, a more reasonable air distribution is formed in the hearth, the air volume and air speed of the inner and outer secondary air can be adjusted respectively according to different combustion stages and load requirements, and therefore the combustion process can be controlled more accurately.

[0053] The inner secondary air pipe 7 is arranged at the outer peripheral side of the precombustion chamber 2. One end of the inner secondary air pipe 7 is in communication with the secondary air main pipe 4, so that the secondary air can flow from the secondary air main pipe 4 into the inner secondary air pipe 7. The other end of the inner secondary air pipe 7 is in communication with the hearth, so that the inner secondary air can enter the hearth from the inner secondary air pipe 7.

[0054] The outer secondary air pipe 8 is arranged at the outermost layer and at the outer peripheral side of the inner secondary air pipe 7. Similarly, one end of the outer secondary air pipe 8 is in communication with the secondary air main pipe 4, so that the secondary air can enter the outer secondary air pipe 8. The other end of the outer secondary air pipe 8 is also in communication with the hearth, so that the outer secondary air can finally enter the hearth.

[0055] It should be noted that, in the embodiment, the arrangement of the inner secondary air pipe 7 and the outer secondary air pipe 8 provides the secondary air with more abundant path options before entering the hearth. The inner secondary air pipe 7 is close to the precombustion chamber 2, and can provide the secondary air for the wind-powder mixture, combustion-supporting gas and preliminary combustion reaction in the precombustion chamber 2 in the initial stage of combustion. The outer secondary air pipe 8 is at the outermost layer, and can provide further oxygen supply and air flow adjustment for the combustion in the hearth in the later stage of the combustion process. Through the synergistic effect of the inner and outer secondary air pipes 8, the air supply in the combustion process can be controlled more accurately, and the combustion efficiency and stability can be improved.

[0056] In some possible implementation forms of the utility model, refer to Figure 1 As shown in the figure, the inner secondary air pipe 7 is internally provided with an inner secondary air hearth inlet cyclone generator 9, and the inner secondary air hearth inlet cyclone generator 9 is located at one end of the inner secondary air pipe 7 close to the hearth.

[0057] By setting the inner secondary air into the furnace cyclone generator 9, the inner secondary air can produce strong rotational movement when entering the furnace. The rotating inner secondary air can be more fully mixed with the fuel carried by the primary air, making the fuel particles more evenly distributed in the furnace, promoting rapid ignition and complete combustion of the fuel, reducing the generation of incomplete combustion products, thereby improving combustion efficiency. At the same time, the rotating inner secondary air can form a stable airflow structure, supporting and stabilizing the flame, preventing the flame from drifting and flickering, and making the flame burn more stably in the center of the furnace, thereby reducing the risk of flameout and explosion.

[0058] In some possible embodiments disclosed in the utility model, referring to Figure 1 As shown in the figure, the outer secondary air into the furnace cyclone generator 10 is arranged in the outer secondary air pipe 8, and the outer secondary air into the furnace cyclone generator 10 is located at one end of the outer secondary air pipe 8 close to the furnace.

[0059] By setting the outer secondary air into the furnace cyclone generator 10, the outer secondary air can form a rotating airflow when entering the furnace. The rotating outer secondary air increases the contact area and mixing degree with the fuel in combustion and the inner secondary air. The fuel can be more fully contacted with oxygen, promoting the progress of the combustion reaction, improving the combustion efficiency and reducing the generation of incomplete combustion products such as carbon monoxide and unburned carbon particles, reducing energy waste and pollutant emissions. At the same time, the rotational flow of the outer secondary air can drive the circulation of the airflow in the furnace, enhancing the heat exchange effect. The rotating airflow can make the heat more evenly distributed in the furnace, reduce the local high-temperature area in the furnace, reduce the thermal stress of the furnace wall, and prolong the service life of the furnace wall.

[0060] In some possible embodiments disclosed in the utility model, referring to Figure 1 As shown in the figure, the micro-oil ignition assembly 3 comprises a micro-oil oil gun 31, a micro-oil ignition gun 32 and a micro-oil combustion-supporting air pipe 33; the micro-oil oil gun 31 and the micro-oil ignition gun 32 are arranged in the micro-oil combustion-supporting air pipe 33 and extend in the same direction as the micro-oil combustion-supporting air pipe 33.

[0061] By arranging the micro-oil oil gun 31 and the micro-oil ignition gun 32 in the micro-oil combustion-supporting air pipe 33, the ignition source is more concentrated. The micro-oil ignition gun 32 can produce high-energy sparks in a small space, quickly igniting the micro amount of fuel sprayed by the micro-oil oil gun 31. This concentrated ignition method improves the success rate and reliability of ignition, ensuring that the fuel can be reliably ignited even under adverse conditions such as low load. At the same time, the micro-oil combustion-supporting air pipe 33 provides a stable channel for the propagation of the flame after ignition. The combustion-supporting air flows in the air pipe, on the one hand providing the necessary oxygen for combustion, and on the other hand stabilizing the flame shape to prevent the flame from being blown away by the surrounding airflow. This helps the flame to propagate smoothly from the micro-oil ignition assembly 3 to the furnace, triggering a stable combustion reaction.

[0062] Specifically, in the pre-chamber 2, when ignition is needed, the micro-oil ignition gun 32 is first operated to generate a spark or a high-energy heat source. The micro-oil oil gun 31 sprays a small amount of fuel, which is rapidly burned under the action of the micro-oil ignition gun 32. The micro-oil combustion air pipe 33 provides a mounting position and support for the micro-oil oil gun 31 and the micro-oil ignition gun 32, and on the other hand, combustion air can be introduced into the air pipe. Combustion air provides the necessary oxygen during micro-oil combustion, promotes the complete combustion of fuel, and also helps to stabilize the flame and control the speed and intensity of combustion. Since the three extend in the same direction, their arrangement in the pre-chamber 2 is more regular, and they can more effectively play their respective roles, together providing a reliable ignition source for the stable combustion burner under low load and other conditions, and laying the foundation for subsequent stable combustion.

[0063] In some possible embodiments disclosed in the utility model, referring to Figure 1 As shown in the figure, the micro-oil combustion air pipe 33 is coaxially arranged with the pre-chamber 2. In this way, the micro-oil ignition assembly 3 forms a symmetrical ignition source at the center position of the pre-chamber 2. This can ensure that the wind-powder mixture and combustion gas in the pre-chamber 2 are subjected to uniform ignition energy in all directions, improving the success rate and reliability of ignition. After ignition, the combustion can also spread more uniformly in the pre-chamber 2, avoiding the situation of local overheating or insufficient combustion. In addition, the micro-oil combustion air pipe 33 is located on the axis of the pre-chamber 2, and the combustion air sprayed by the micro-oil combustion air pipe 33 can form a stable air flow at the center position, which helps to maintain the shape and stability of the flame. The flame can maintain a relatively regular shape under the action of the coaxial air flow, reducing the fluctuation and flicker of the flame, and improving the stability and efficiency of combustion.

[0064] In the axial direction of the stable combustion burner, the pre-chamber 2 is cylindrical or approximately cylindrical. The micro-oil combustion air pipe 33 extends along the axial direction of the stable combustion burner, and the axis of the micro-oil combustion air pipe 33 coincides with the axis of the pre-chamber 2.

[0065] In some possible embodiments disclosed in the utility model, referring to Figure 1 As shown in the figure, the stable combustion burner further comprises: a micro-oil combustion air supply pipe 11; one end of the micro-oil combustion air supply pipe 11 is in communication with the secondary air main pipe 4, and the other end is in communication with the micro-oil combustion air pipe 33.

[0066] By connecting the micro-oil combustion air supply pipe 11 with the secondary air main pipe 4, it is ensured that the micro-oil combustion air pipe 33 can obtain a stable combustion air source.

[0067] The one end of the micro-oil combustion-supporting air supply pipe 11 is communicated with the secondary air main pipe 4, so that part of the air in the secondary air main pipe 4 can flow into the micro-oil combustion-supporting air supply pipe 11 through the connection point. The secondary air main pipe 4 provides the main pipeline for the secondary air of the whole stable combustion burner, and the air in the secondary air main pipe 4 can be a gas such as treated air, and has a certain pressure and flow.

[0068] The other end of the micro-oil combustion-supporting air supply pipe 11 is communicated with the micro-oil combustion-supporting air pipe 33. The micro-oil combustion-supporting air pipe 33 is part of the micro-oil ignition assembly 3 and surrounds the micro-oil oil gun 31 and the micro-oil ignition gun 32 and the like. When the air in the micro-oil combustion-supporting air supply pipe 11 flows into the micro-oil combustion-supporting air pipe 33, the combustion-supporting air can provide necessary support for the micro-oil ignition process and the subsequent combustion.

[0069] Specifically, when the stable combustion burner is running, part of the air in the secondary air main pipe 4 is guided to the micro-oil combustion-supporting air pipe 33 through the micro-oil combustion-supporting air supply pipe 11. In the micro-oil combustion-supporting air pipe 33, the combustion-supporting air interacts with the micro-oil oil gun 31 and the ignition energy generated by the micro-oil ignition gun 32. The combustion-supporting air provides the required oxygen for the combustion of the oil, promotes the rapid combustion of the micro-oil, and generates a high-temperature flame. This high-temperature flame can serve as a stable ignition source to ignite the wind-powder mixture and combustion-supporting gas in the hearth, thereby starting the entire combustion process. At the same time, the combustion-supporting air can also stabilize the flame, adjust the combustion temperature and speed, and the like, to ensure the efficiency and stability of the combustion.

[0070] In some possible implementation examples disclosed by the utility model, referring to Figure 1 As shown in the figure, the stable combustion burner further comprises a burner nozzle 12. The burner nozzle 12 is arranged at one end of the pre-chamber 2 close to the hearth, and the cross-sectional area of the burner nozzle 12 gradually increases in the direction of the pre-chamber 2 towards the hearth. Therefore, the wind-powder mixture, combustion-supporting gas and secondary air and the like flowing out of the pre-chamber 2 can gradually diffuse and be more uniformly distributed in the hearth, improving the uniformity and stability of the combustion and avoiding the situation that the local combustion is too strong or too weak due to the excessive concentration of the airflow.

[0071] In actual application, the airflow channel through the burner nozzle 12 gradually widens. It can be understood that according to the principle of fluid mechanics, the airflow velocity gradually decreases. The lower airflow velocity can make the combustion flame more stable, reduce the fluctuation and flicker of the flame, and be conducive to maintaining the stability of the combustion in the case of load change or external interference.

[0072] Specifically, in the embodiment, the burner nozzle 12 comprises a primary air nozzle, an inner secondary air nozzle and an outer secondary air nozzle. The primary air nozzle is communicated with the pre-chamber 2, and is used for injecting the wind-powder mixture carrying the fuel such as coal powder into the furnace. The inner secondary air nozzle is communicated with the inner secondary air pipe 7, and is located at the outer peripheral side of the primary air nozzle, and is used for introducing the secondary air in the inner secondary air pipe 7 into the furnace. The outer secondary air nozzle is communicated with the outer secondary air pipe 8, and is located at the outer peripheral side of the inner secondary air nozzle, and is responsible for injecting the secondary air in the outer secondary air pipe 8 into the furnace.

[0073] Those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0074] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principle of the present application, a number of improvements and modifications can be made, and these improvements and modifications shall be considered as the protection scope of the present application.

Claims

1. A stable combustion burner characterized by, The stable combustion burner comprises a primary air powder pipe (1) and a precombustion chamber (2) arranged on the side close to the furnace of the primary air powder pipe (1) and in communication with the primary air powder pipe (1) and the furnace, the inside of the precombustion chamber (2) is provided with a micro-oil ignition assembly (3) penetrating through the precombustion chamber (2), and the outside of the precombustion chamber (2) is provided with a secondary air main pipe (4) in communication with the precombustion chamber (2). The stable combustion burner further comprises a combustion-supporting gas pipe (5) in communication with the precombustion chamber (2), and the combustion-supporting gas pipe (5) is arranged on the same side of the precombustion chamber (2) as the primary air powder pipe (1).

2. The stable combustion burner according to claim 1, wherein The combustion-supporting gas pipe (5) is arranged in plurality, and the plurality of combustion-supporting gas pipes (5) are uniformly arranged along the circumferential direction of the primary air powder pipe (1).

3. The stable combustion burner according to claim 1, wherein The secondary air main pipe (4) is provided with a secondary air into precombustion chamber rotational flow generator (6) at one end close to the precombustion chamber (2).

4. The flameholding burner of claim 1 wherein, Further comprising: An inner secondary air pipe (7) and an outer secondary air pipe (8); The inner secondary air pipe (7) is arranged on the outer circumferential side of the precombustion chamber (2), one end of the inner secondary air pipe (7) is in communication with the secondary air main pipe (4), and the other end is in communication with the furnace; The outer secondary air pipe (8) is arranged on the outer circumferential side of the inner secondary air pipe (7), one end of the outer secondary air pipe (8) is in communication with the secondary air main pipe (4), and the other end is in communication with the furnace.

5. The stable combustion burner according to claim 4, wherein The inner secondary air pipe (7) is provided with an inner secondary air into furnace rotational flow generator (9) at one end close to the furnace.

6. The stable combustion burner according to claim 4, wherein The outer secondary air pipe (8) is provided with an outer secondary air into furnace rotational flow generator (10) at one end close to the furnace.

7. The flameholding burner of claim 1 wherein, The micro-oil ignition assembly (3) comprises: A micro-oil oil gun (31), a micro-oil ignition gun (32), and a micro-oil combustion-supporting air pipe (33); The micro-oil oil gun (31) and the micro-oil ignition gun (32) are arranged in the micro-oil combustion-supporting air pipe (33) and extend in the same direction as the micro-oil combustion-supporting air pipe (33).

8. The stable combustion burner according to claim 7, wherein The micro-oil combustion-supporting air pipe (33) is coaxially arranged with the precombustion chamber (2).

9. The flame stabilization burner of claim 7, wherein, Further comprising: A micro-oil combustion-supporting air supply pipe (11); One end of the micro-oil combustion-supporting air supply pipe (11) is in communication with the secondary air main pipe (4), and the other end is in communication with the micro-oil combustion-supporting air pipe (33).

10. The flameholding burner of claim 1 wherein, Further comprising: A burner nozzle (12); The burner nozzle (12) is arranged at one end of the pre-chamber (2) close to the furnace, and the cross-sectional area of the burner nozzle (12) gradually increases in the direction of the pre-chamber (2) towards the furnace.

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