Combustor with multiple mixed air

Abstract

The utility model relates to a combustor, in particular to a multi-air-mixing combustor, which comprises a combustion chamber, and further comprises a jacket layer arranged outside the combustion chamber and communicated with the combustion chamber; the flame core air duct is arranged at an inlet of the combustion chamber and is communicated with the combustion chamber; the fuel channel is arranged on the outer side of the flame core air duct and is communicated with the combustion chamber; the combustion air duct is arranged on the outer side of the fuel channel and is communicated with the combustion chamber; and the flame forming air duct is arranged on the outer side of the combustion air duct and is communicated with the jacket layer. According to the burner with the multiple mixed air, more air can be gathered so that pulverized coal with a low heat value can be stably burnt, the mixture of the pulverized coal and the air can be gasified and pre-burnt for a long time, the air needed by burning is separated from the air needed by flame forming, and the influence of the boundary layer effect is reduced to the minimum.

Description

Technical Field

[0001] This utility model relates to a burner, and more particularly to a multi-mixing air burner. Background Technology

[0002] Most existing pulverized coal burners use a combination of pulverized coal injection pipes and combustion ducts for combustion. Because pulverized coal cannot burn completely quickly, a large amount of black ash is produced after combustion. Therefore, an auxiliary furnace is added to increase the combustion time and optimize the combustion effect. Although adding an auxiliary furnace can improve the combustion effect, black ash still exists, albeit in reduced quantities. Furthermore, the auxiliary furnace is difficult to maintain. Utility Model Content

[0003] To address the aforementioned problems of incomplete pulverized coal combustion and the difficulty in maintaining existing auxiliary furnaces, this utility model provides a multi-air mixing burner, the specific technical solution of which is as follows:

[0004] A multi-mixed air burner includes a combustion chamber and further comprises: a jacket layer disposed outside the combustion chamber and communicating with the combustion chamber; a flame core air duct disposed at the inlet of the combustion chamber and communicating with the combustion chamber; a fuel passage disposed outside the flame core air duct and communicating with the combustion chamber; a combustion air duct disposed outside the fuel passage and communicating with the combustion chamber; and a flame forming air duct disposed outside the combustion air duct and communicating with the jacket layer.

[0005] The flame core air duct provides the necessary airflow for the combustion of the flame core.

[0006] The fuel feed method in the fuel channel can be radial or axial. When the fuel is in powder form, it is blown into the fuel channel by a blower.

[0007] The combustion air duct provides the necessary airflow for the outer flame of the fire to burn.

[0008] The air from the flame-forming duct enters the outer chamber of the combustion chamber and is blown out, shaping the flame shape outside the combustion chamber.

[0009] The sequential arrangement of multiple air ducts helps to produce a perfect air-fuel state, which is very conducive to complete combustion and improves oxygen utilization.

[0010] Preferably, the flame core air duct, the fuel channel, the combustion air duct, and the flame forming air duct are arranged on the same axis.

[0011] Preferably, the combustion air duct is provided with a second flaring device at the inlet.

[0012] The combustion air duct inlet has a flaring device to increase air volume and air pressure.

[0013] Preferably, a first flaring device is provided at the inlet of the flame core air duct.

[0014] Preferred, the combustion duct is provided with a number of first helical blades in an annular array.

[0015] Preferably, the fuel channel is provided with a number of second helical blades in a ring array.

[0016] Preferably, the air outlet of the flame core air duct is provided with an air outlet plate, and the air outlet plate is provided with a number of small air outlet holes.

[0017] Preferably, the combustion chamber is coaxial with the jacket layer.

[0018] Preferably, an oil gun is also provided in the flame core air duct.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention provides a multi-mixed air burner that can gather more air to enable stable combustion of low-calorific-value pulverized coal, allowing the pulverized coal and air mixture to have a longer time for gasification and pre-combustion, separating the air required for combustion from the air required for flame formation, thereby minimizing the influence of boundary layer effects.

[0021] When using pulverized coal with low calorific value and low volatile matter, ordinary burners will have unstable combustion and be prone to flameout, while the burner of this application has stable combustion. Attached Figure Description

[0022] Figure 1 This is a sectional view from the first perspective of this application;

[0023] Figure 2 This is a cross-sectional view from the second perspective of this application. Detailed Implementation

[0024] The present invention will now be further described with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 2 As shown, a multi-air mixing burner includes a combustion chamber 1, a jacket layer 2, a flame core air duct 3, a fuel channel 4, a combustion air duct 5, and a flame forming air duct 6. The jacket layer 2 is coaxially arranged with the combustion chamber 1 and is located outside the combustion chamber 1, and the jacket layer 2 is also in communication with the combustion chamber 1; the flame core air duct 3, fuel channel 4, combustion air duct 5, and flame forming air duct 6 are sequentially arranged from the inside to the outside, and the flame core air duct 3, fuel channel 4, and combustion air duct 5 are all in communication with the combustion chamber 1, while the flame forming air duct 6 is in communication with the jacket layer 2.

[0026] Combustion chamber 1 adopts a double-layer inner liner structure, in which the pulverized coal from the flame core air duct 3, fuel channel 4 and combustion air duct 5 mixes and burns with air in the inner liner, while the air from the flame forming air duct 6 is directly blown into the outer liner interlayer of combustion chamber 1.

[0027] Flame Core Air Duct 3 provides the required airflow for the combustion of the flame core.

[0028] The fuel feeding method of fuel channel 4 can be radial or axial. When the fuel is in powder form, it is blown into fuel channel 4 by a blower.

[0029] Combustion duct 5 provides the required airflow for the outer flame combustion.

[0030] The air from the flame-forming air duct 6 enters the outer liner of the combustion chamber 1 and is blown out, shaping the flame shape outside the combustion chamber 1.

[0031] The sequential arrangement of multiple air ducts helps to produce a perfect air-fuel state, which is very conducive to complete combustion and improves oxygen utilization.

[0032] A second flaring device 51 is provided at the inlet of the combustion air duct 5, which can increase the air volume and air pressure. The second flaring device is conical.

[0033] The inlet of the flame core air duct 3 is provided with a first flaring device 31. The first flaring device 31 is used to gather more air through the air duct and enter the combustion zone of the combustion chamber 1, so that even pulverized coal with low calorific value can be burned stably.

[0034] The air pressure generated by the second flaring device 51 is higher than that of the flame forming air duct 6, thus forming a high-pressure zone on the outer layer of the flame zone, preventing fuel from escaping.

[0035] Combustion chamber 1 adopts a double-layer structure, which is conducive to heat preservation, increases furnace temperature, and accelerates pulverized coal gasification and combustion.

[0036] The double-layer structure of combustion chamber 1, in conjunction with flame core air duct 3, fuel passage 4, combustion air duct 5 and flame forming air duct 6, separates the air required for combustion from the air required for flame forming, thereby minimizing the influence of boundary layer effect.

[0037] The combustion chamber 1 at the front end of the burner cylinder adopts a double-layer structure with a length of 500mm~2000mm. This allows for a longer gasification and pre-combustion time for the pulverized coal and air mixture.

[0038] The combustion duct 5 has a ring array of several first helical blades 52. The fuel passage 4 has a ring array of several second helical blades 42. Both the first and second helical blades 52 are located at the inlet of the combustion chamber 1. The first helical blades 52 help the burner generate rotating airflow for diffusion combustion, resulting in more complete combustion. The second helical blades 42 help the fuel to rotate and be sprayed out, resulting in more complete fuel combustion.

[0039] An air outlet plate (not shown in the figure) is provided at the air outlet of the flame core air duct 3, and the air outlet plate has several small air outlet holes. The flame core air duct 3 provides central air to the burner. The air coming out through the air outlet plate has a smaller air volume but a higher air velocity compared to the straight-through air duct.

[0040] When the burner requires to burn oil, an oil gun can be placed in the center of the flame core air duct 3, and the fuel is sprayed out after being atomized from the oil gun.

[0041] When the burner is required to burn gas, the outermost flame-forming air duct 6 can be used to place the gas nozzle in a ring.

[0042] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these embodiments will all fall within the protection scope of the claims of this utility model.

Claims

1. A multi-air mixing burner, comprising a combustion chamber (1), characterized in that, Also includes: A jacket layer (2) is provided outside the combustion chamber (1) and communicates with the combustion chamber (1); The flame core air duct (3) is located at the inlet of the combustion chamber (1) and is connected to the combustion chamber (1); The fuel passage (4) is located outside the flame core air passage (3) and communicates with the combustion chamber (1); Combustion duct (5) is located outside the fuel passage (4) and communicates with the combustion chamber (1); and The flame-forming air duct (6) is located on the outside of the combustion air duct (5) and communicates with the jacket layer (2).

2. A multi-air mixing burner according to claim 1, characterized in that, The flame core air duct (3), the fuel channel (4), the combustion air duct (5), and the flame forming air duct (6) are all arranged on the same axis.

3. A multi-air mixing burner according to claim 1, characterized in that, The combustion duct (5) is provided with a second flaring device (51) at the inlet.

4. A multi-air mixing burner according to claim 1, characterized in that, The inlet of the flame core air duct (3) is provided with a first flaring device (31).

5. A multi-air mixing burner according to claim 1, characterized in that, The combustion duct (5) has a ring array of several first spiral blades (52).

6. A multi-air mixing burner according to claim 1, characterized in that, The fuel channel (4) is provided with a number of second helical blades (42) arranged in an annular array.

7. A multi-air mixing burner according to claim 1, characterized in that, The air outlet of the flame core air duct (3) is provided with an air outlet plate, and the air outlet plate is provided with several small air outlet holes.

8. A multi-air mixing burner according to claim 1, characterized in that, The combustion chamber (1) is coaxial with the jacket layer (2).

9. A multi-mixing air burner according to any one of claims 1 to 8, characterized in that, An oil gun is also installed inside the flame core air duct (3).

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