Heat accumulating type low-nitrogen high-speed burner

Abstract

The utility model relates to the technical field of flame nozzles, and provides a heat accumulating type low-nitrogen high-speed burner which comprises a refractory casting part arranged in a shell, a burner block arranged in the refractory casting part, a burner port formed by the burner block and the refractory casting part, a fuel pipe arranged on the burner block and communicated with the burner port, and a heat accumulating type low-nitrogen high-speed burner. The first-stage combustion-supporting air pipe is arranged on the burner block, the fuel pipe is located in the first-stage combustion-supporting air pipe, and the first-stage combustion-supporting air pipe is communicated with the combustion port; the multiple second-stage combustion-supporting air pipes are circumferentially arranged on the burner block at intervals, the second-stage combustion-supporting air pipes communicate with the combustion opening, and included angles are formed between the axes of the second-stage combustion-supporting air pipes and the axis of the first-stage combustion-supporting air pipe. Through the technical scheme, the problem that in the prior art, the content of nitrogen oxide generated during high-temperature combustion is difficult to control is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of flame spray nozzles, in particular to a regenerative low-nitrogen high-speed burner nozzle. Background Art

[0002] At present, the requirements for flue gas emissions from industrial furnaces are becoming increasingly stringent at home and abroad, especially the requirements for NOx emissions are becoming more and more stringent. As the core heating equipment on industrial furnaces, burners bear the arduous responsibility of reducing NOx. Especially in regenerative furnaces, when the heat storage temperature of the air reaches about 1100℃, it is particularly difficult to reduce NOx emissions. While regenerative furnaces save energy for users, they must also consider reducing the emission of atmospheric pollutants. Therefore, the design of burners faces severe challenges.

[0003] In the existing high-speed burners, the mixing of the fuel gas and the incoming air is not sufficient during the air intake, and the amount of NOx generated during the initial combustion process is unstable. Utility Model Content

[0004] The utility model provides a regenerative low-nitrogen high-speed burner, which solves the problem in the related art that the content of nitrogen oxides produced during high-temperature combustion is difficult to control.

[0005] The technical solution of the utility model is as follows:

[0006] The regenerative low-nitrogen high-speed burner comprises a refractory casting arranged in a shell, a burner brick is arranged in the refractory casting, the burner brick and the refractory casting form a combustion port, a fuel pipe is arranged on the burner brick, and the fuel pipe is connected to the combustion port, and further comprises:

[0007] A primary combustion-supporting air duct is arranged on the burner brick, the fuel pipe is located in the primary combustion-supporting air duct, and the primary combustion-supporting air duct is connected to the burner port;

[0008] There are a plurality of secondary combustion-supporting air ducts which are circumferentially spaced on the burner brick. The secondary combustion-supporting air ducts are connected to the combustion port, and the axis of the secondary combustion-supporting air ducts forms an angle with the axis of the primary combustion-supporting air duct.

[0009] As a further technical solution, the end of the fuel pipe close to the burner port is tapered, and the radial cross-section gradually decreases along the direction close to the burner port.

[0010] As a further technical solution, it also includes:

[0011] There are a plurality of three-stage combustion-supporting air ducts, which are arranged on the refractory castable along the circumference of the first-stage combustion-supporting air duct at intervals, and the outlets of the three-stage combustion-supporting air ducts lead into the furnace.

[0012] As a further technical solution, it also includes:

[0013] The air intake space is located between the burner brick and the refractory castable, and the secondary combustion-supporting air duct and the tertiary combustion-supporting air duct are connected to the air intake space.

[0014] As a further technical solution, it also includes:

[0015] The flame detection component is arranged on the shell, penetrates the refractory casting component, and has one end located at the combustion port.

[0016] As a further technical solution, it also includes:

[0017] An ignition gun is arranged on the shell and penetrates the refractory casting. One end of the ignition gun is located at the combustion port.

[0018] As a further technical solution, the outlet of the three-stage combustion-supporting air duct is conical, and the radial cross-sectional area decreases along the ventilation direction of the three-stage combustion-supporting air duct.

[0019] As a further technical solution, it also includes:

[0020] There are a plurality of vent holes which are arranged at intervals on the fuel pipe, and the vent holes are located in the first-level combustion-supporting pipe.

[0021] The beneficial effects of the utility model are:

[0022] In the utility model, the shell plays a protective role. The refractory cast parts in the shell form a combustion port together with the burner brick while performing heat insulation. The fuel pipe is connected to the combustion port. After the fuel is introduced into the fuel pipe, the first-level combustion-supporting air duct will be ventilated synchronously. The wind in the first-level combustion-supporting air duct is usually high-speed room-temperature air, which can not only provide oxygen for the combustion of the fuel, but also because the air is room-temperature air, it can help cool the combustion port, so that the temperature of the combustion port will not be too high, effectively extending the service life. The second-level combustion-supporting air duct is arranged at circumferential intervals on all sides and all directions are toward the direction of the first-level combustion-supporting air duct, forming a first combustion area with the air and fuel blown out of the first-level combustion-supporting air duct. The oxygen content in the first combustion area will be controlled by the combustion-supporting air duct and the second-level combustion-supporting air duct, so that the first combustion area is in an oxygen-deficient state with more fuel and less oxygen, so that this area is in a reducing atmosphere, which reduces the combustion rate, prevents this area from being too hot, and reduces the generation of nitrogen oxides. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0024] Figure 1It is a schematic diagram of the structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the fuel pipe and the first-level combustion-supporting air pipe in the structure of the utility model;

[0026] In the figure: 1. shell, 110. refractory casting, 120. burner brick, 130. combustion port, 2. fuel pipe, 3. primary combustion-supporting air duct, 4. secondary combustion-supporting air duct, 5. tertiary combustion-supporting air duct, 6. air intake space, 7. flame detection component, 8. ignition gun, 9. air vent. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, they can also be understood as further technical solutions without paying creative work. In some figures, components with the same structure or function are only schematically illustrated, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0028] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0029] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] Reference Figure 1~Figure 2, which is the first embodiment of the utility model, proposes a regenerative low-nitrogen high-speed burner, including a refractory cast part 110 arranged in a shell 1, a burner brick 120 arranged in the refractory cast part 110, the burner brick 120 and the refractory cast part 110 form a combustion port 130, a fuel pipe 2 is arranged on the burner brick 120, and the fuel pipe 2 is connected to the combustion port 130, and also includes: a first-level combustion-supporting air duct 3 is arranged on the burner brick 120, the fuel pipe 2 is located in the first-level combustion-supporting air duct 3, and the first-level combustion-supporting air duct 3 is connected to the combustion port 130; there are a plurality of second-level combustion-supporting air ducts 4, which are arranged on the burner brick 120 at circumferential intervals, the second-level combustion-supporting air duct 4 is connected to the combustion port 130, and the axis of the second-level combustion-supporting air duct 4 and the axis of the first-level combustion-supporting air duct 3 have an angle.

[0031] In this embodiment, the shell 1 forms the shape of a burner, and the refractory casting 110 forms a combustion port 130 together with the burner brick 120 while performing heat insulation. The fuel pipe 2 is connected to the combustion port 130. After the fuel is introduced into the fuel pipe 2, the primary combustion-supporting air duct 3 will be ventilated synchronously. The wind in the primary combustion-supporting air duct 3 is usually high-speed room-temperature air, which can not only provide oxygen for the combustion of the fuel, but also because the air is room-temperature air, it can help the combustion port 130 to cool down, so that the temperature of the combustion port 130 will not be too high, effectively extending the service life. The secondary combustion-supporting air duct 4 is arranged at intervals around the circumference and all directions are toward the primary combustion-supporting air duct 3. The air and fuel blown out of the primary combustion-supporting air duct 3 form a first combustion area. The oxygen content in the first combustion area will be controlled by the combustion-supporting air duct and the secondary combustion-supporting air duct 4 together, so that the first combustion area is in an oxygen-deficient state with more fuel and less oxygen, so that this area is in a reducing atmosphere, which reduces the combustion rate, prevents this area from being too hot, and reduces the generation of nitrogen oxides.

[0032] As a further technical solution, the end of the fuel pipe 2 close to the burner port 130 is tapered, and the radial cross-section gradually decreases along the direction close to the burner port 130.

[0033] In this embodiment, the tapered portion of the fuel pipe 2 near the burner 130 further increases the air velocity leaving the burner 130. The speed of the combustion air determines the severity of the smoke entrainment in the furnace. As the speed increases, the generation of nitrogen oxides can be further reduced.

[0034] As a further technical solution, it also includes: there are a plurality of third-level combustion-supporting air ducts 5, and the plurality of third-level combustion-supporting air ducts 5 are arranged on the refractory cast part 110 at intervals along the circumference of the first-level combustion-supporting air duct 3, and the outlets of the third-level combustion-supporting air ducts 5 lead into the furnace.

[0035] In this embodiment, the distance between the third-level combustion-supporting air duct 5 and the first-level combustion-supporting air duct 3 is farther than that of the second-level combustion-supporting air duct 4, ensuring that the volume of entrained smoke generated by the third-level combustion-supporting air duct 5 is sufficient to dilute the oxygen content in the combustion-supporting air, ensuring that the combustion rate can be effectively reduced, thereby controlling the amount of nitrogen oxides generated. The third-level combustion-supporting air duct 5, as the third supplement of oxygen content, can not only make the fuel finally burn more fully, but also reduce the combustion temperature, thereby reducing the generation of nitrogen oxides.

[0036] As a further technical solution, it also includes: the air intake space 6 is located between the burner brick 120 and the refractory cast part 110, and the secondary combustion-supporting air duct 4 and the tertiary combustion-supporting air duct 5 are connected to the air intake space 6.

[0037] In this embodiment, the air intake space 6 is used to connect the second combustion-supporting air duct and the third combustion-supporting air duct. The air intake space 6 is located near the burner 130. This area has a certain temperature, which can not only preheat the combustion-supporting air passing through, but also ensure that the secondary combustion-supporting air and the tertiary combustion-supporting air have the same composition. At the same time, the structure is simple, which reduces the difficulty of production.

[0038] As a further technical solution, it also includes: the flame detection component 7 is arranged on the shell 1, passes through the refractory casting 110, and one end is located at the combustion port 130.

[0039] In this embodiment, the flame detection component 7 is used to detect whether there is still flame at the combustion port 130. When burning normally, the flame detection component 7 detects that there is still flame, which will ensure the normal supply of fuel. If it is detected that the flame disappears, the fuel pipe 2 will be closed so that it will no longer continue to supply fuel, thereby preventing accidents and preventing fuel waste, thereby ensuring safe use.

[0040] As a further technical solution, it also includes: an ignition gun 8 is arranged on the shell 1 and penetrates the refractory casting 110 , and one end of the ignition gun 8 is located at the combustion port 130 .

[0041] In this embodiment, after the fuel is introduced through the fuel pipe 2, it will pass through the ignition gun 8. The electric spark generated by the ignition gun 8 will ignite the fuel to ensure that the fuel can burn normally. After the flame detection component 7 detects that the flame has disappeared, the ignition gun 8 will also generate electric sparks to make the fuel burn again, ensuring the normal operation of the burner.

[0042] As a further technical solution, the outlet of the three-stage combustion-supporting air duct 5 is conical, and the radial cross-sectional area along the ventilation direction of the three-stage combustion-supporting air duct 5 decreases.

[0043] In this embodiment, the gradual reduction in the cross-sectional area at the end of the three-stage combustion-supporting air duct 5 can also increase the speed of the combustion air leaving the three-stage combustion-supporting air duct 5, increase the suction of the flue gas, reduce the oxygen content in the combustion area, reduce the combustion rate, and reduce the generation of nitrogen oxides.

[0044] As a further technical solution, it also includes: there are a plurality of vent holes 9, which are arranged at intervals on the fuel pipe 2, and the vent holes 9 are located in the first-level combustion-supporting pipe.

[0045] In this embodiment, the air holes 9 improve the mixing of the fuel gas and the combustion-supporting air, thereby improving the combustion effect without reducing the overall speed, thereby preventing the generation of nitrogen oxides while ensuring stable combustion.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A regenerative low-nitrogen high-speed burner, comprising a refractory cast part (110) arranged in a shell (1), a burner brick (120) arranged in the refractory cast part (110), the burner brick (120) and the refractory cast part (110) forming a combustion port (130), a fuel pipe (2) arranged on the burner brick (120), the fuel pipe (2) being connected to the combustion port (130), characterized in that: Also includes: A first-level combustion-supporting air duct (3) is arranged on the burner brick (120), the fuel pipe (2) is located in the first-level combustion-supporting air duct (3), and the first-level combustion-supporting air duct (3) is connected to the combustion port (130); A plurality of secondary combustion-supporting air ducts (4) are arranged on the burner brick (120) at circumferential intervals. The secondary combustion-supporting air ducts (4) are connected to the combustion port (130), and the axis of the secondary combustion-supporting air duct (4) and the axis of the primary combustion-supporting air duct (3) form an angle.

2. The regenerative low nitrogen high-speed burner according to claim 1 is characterized in that: One end of the fuel pipe (2) close to the combustion port (130) is tapered, and the radial cross section gradually decreases in the direction close to the combustion port (130).

3. The regenerative low nitrogen high-speed burner according to claim 1 is characterized in that: Also includes: The third-level combustion-supporting air duct (5) is provided in a plurality, and the plurality of the third-level combustion-supporting air ducts (5) are arranged on the refractory cast part (110) at intervals along the circumference of the first-level combustion-supporting air duct (3), and the outlets of the third-level combustion-supporting air duct (5) lead into the furnace.

4. The regenerative low nitrogen high-speed burner according to claim 3 is characterized in that: Also includes: An air intake space (6) is located between the burner brick (120) and the refractory cast part (110), and the secondary combustion-supporting air duct (4) and the tertiary combustion-supporting air duct (5) are in communication with the air intake space (6).

5. The regenerative low nitrogen high-speed burner according to claim 1 is characterized in that: Also includes: A flame detection component (7) is arranged on the housing (1), passes through the refractory casting (110), and has one end located at the combustion port (130).

6. The regenerative low nitrogen high-speed burner according to claim 1 is characterized in that: Also includes: An ignition gun (8) is arranged on the housing (1) and penetrates the refractory casting (110); one end of the ignition gun (8) is located at the combustion port (130).

7. The regenerative low nitrogen high-speed burner according to claim 3 is characterized in that: The outlet of the three-stage combustion-supporting air duct (5) is conical, and the radial cross-sectional area decreases along the ventilation direction of the three-stage combustion-supporting air duct (5).

8. The regenerative low nitrogen high-speed burner according to claim 1, characterized in that: Also includes: A plurality of vent holes (9) are arranged at intervals on the fuel pipe (2); the vent holes (9) are located in the first-level combustion-supporting air pipe (3).

Images