A high combustion stability supplementary combustion heating burner device

Abstract

The present invention discloses a high-combustion-stability supplementary combustion heating burner device, comprising a fuel tray, a gas fuel pipe, a combustion-supporting air cylinder and an annular gradient wind hood; the fuel tray, the gas fuel pipe and the combustion-supporting air cylinder are arranged in sequence from the inside to the outside, a gas fuel channel is formed between the fuel tray and the gas fuel pipe, a combustion-supporting air channel is formed between the gas fuel pipe and the combustion-supporting air cylinder, the annular gradient wind hood is arranged at the outlet of the combustion-supporting air channel, a plurality of air outlet holes are provided on the annular gradient wind hood, and a plurality of fuel nozzles are provided on the fuel tray; from the inside to the outside, the diameters of the air outlet holes on the annular gradient wind hood gradually increase, and the device can effectively eliminate the problem of poor supplementary combustion stability of the preheating boiler.

Description

Technical Field

[0001] The invention belongs to the technical field of waste heat boiler combustion, and relates to a high combustion stability supplementary combustion heating burner device. Background Art

[0002] In recent years, as the national environmental protection standards have become increasingly stringent, coal-fired units have been almost stagnant, while gas turbine-equipped waste heat boilers have been widely favored at home and abroad due to their high power generation efficiency and low pollutant emissions. In order to increase the steam temperature or output, the waste heat boiler usually needs to adopt a supplementary combustion system. The supplementary combustion system is divided into internal supplementary combustion and external supplementary combustion. Since the external supplementary combustion system requires a dedicated external combustion chamber at the front of the boiler, its investment is high, operation and maintenance are inconvenient, and the boiler structure is complex, so the external supplementary combustion solution will only be adopted when the supplementary combustion volume is very large or the user has clear requirements. The internal supplementary combustion system is generally installed in the boiler inlet flue, using the excess air in the exhaust gas of the gas turbine as the combustion air, and using the internal space of the inlet flue as the supplementary combustion chamber, with a combustion fan, a simple system, low equipment investment, and convenient operation and maintenance. It is a commonly used supplementary combustion solution for waste heat boilers. At present, most of the internal supplementary combustion devices for waste heat boilers commonly used at home and abroad have the defect of not being able to burn stably. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a high combustion stability supplementary combustion heating burner device, which can effectively eliminate the problem of poor supplementary combustion stability of the preheating boiler.

[0004] In order to achieve the above-mentioned object, the high combustion stability supplementary combustion heating burner device of the present invention comprises a fuel tray, a gas fuel pipe, a combustion-supporting air cylinder and an annular gradient air hood;

[0005] The fuel tray, the gas fuel pipe and the combustion-supporting air cylinder are arranged in sequence from the inside to the outside, a gas fuel channel is formed between the fuel tray and the gas fuel pipe, a combustion-supporting air channel is formed between the gas fuel pipe and the combustion-supporting air cylinder, an annular gradient wind hood is arranged at the outlet of the combustion-supporting air channel, a plurality of air outlet holes are opened on the annular gradient wind hood, and a plurality of fuel nozzles are opened on the fuel tray;

[0006] From inside to outside, the diameters of the air outlet holes on the annular gradient air hood gradually increase.

[0007] The fuel pan is located within the top opening of the gas fuel pipe.

[0008] The fuel injection ports are arranged in sequence along the circumferential direction.

[0009] The included angle between the injection direction of the fuel nozzle and the center line of the fuel tray is α, and 0°<α≤70°.

[0010] The fuel tray is located in the central area of ​​the annular gradient wind hood.

[0011] The inclination angle of the side wall of the annular gradient wind shield is β, wherein 10°<β≤50°.

[0012] The present invention has the following beneficial effects:

[0013] During the specific operation of the high-combustibility supplementary combustion heating burner device described in the present invention, the gas fuel is delivered to the fuel tray through the gas fuel pipe, and then ejected through the fuel nozzles arranged on the fuel tray, so that the gas fuel is ejected in an umbrella-shaped structure, and the combustion-supporting wind passes through the combustion-supporting wind tube and is ejected through the air outlet holes on the annular gradient wind hood, wherein the wind level gradually increases along the axial direction, and the air volume delivered to the fuel tray area becomes larger and larger along the axial direction, and air is delivered layer by layer on site to ensure combustion stability, while achieving improved burnout and low NOx characteristics, the root combustion flame is always in the burner barrel, and will not be affected by the high-temperature oxygen-deficient flue gas of the waste heat boiler, and continuously and stably increases the flue gas temperature in the furnace for the waste heat boiler, thereby improving the operating efficiency of the entire unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 is a side view of the present invention;

[0016] Figure 3 It is a structural schematic diagram of the fuel nozzle in the present invention;

[0017] Figure 4 It is a structural schematic diagram of the annular gradient wind shield 2 of the present invention;

[0018] Among them, 1 is a combustion-supporting air cylinder, 2 is an annular gradient wind hood, 3 is a fuel tray, and 4 is a gas fuel pipe. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0020] refer to Figures 1 to 4 The high combustion stability supplementary combustion heating burner device described in the present invention includes a fuel tray 3, a gas fuel pipe 4, a combustion-supporting air cylinder 1 and an annular gradient wind hood 2; the fuel tray 3, the gas fuel pipe 4 and the combustion-supporting air cylinder 1 are arranged in sequence from the inside to the outside, a gas fuel channel is formed between the fuel tray 3 and the gas fuel pipe 4, a combustion-supporting air channel is formed between the gas fuel pipe 4 and the combustion-supporting air cylinder 1, the annular gradient wind hood 2 is arranged at the outlet of the combustion-supporting air channel, a plurality of air outlet holes are opened on the annular gradient wind hood 2, and a plurality of fuel nozzles are opened on the fuel tray 3; from the inside to the outside, the diameter of each air outlet hole on the annular gradient wind hood 2 gradually increases.

[0021] The fuel tray 3 is located in the top opening of the gas fuel pipe 4; the fuel nozzles are arranged in sequence along the circumferential direction, and the angle between the injection direction of the fuel nozzle and the center line of the fuel tray 3 is α, and 0°<α≤70°.

[0022] The fuel tray 3 is located at the central area of ​​the annular gradient wind shield 2, and the inclination angle of the side wall of the annular gradient wind shield 2 is β, wherein 10°<β≤50°.

[0023] The specific working process of the present invention is:

[0024] The gas fuel is delivered to the fuel tray 3 through the gas fuel pipe 4, and then ejected through the fuel nozzles arranged on the fuel tray 3, so that the gas fuel is ejected in an umbrella-shaped structure. The combustion-supporting wind passes through the combustion-supporting wind tube 1 and is ejected through the air outlet holes on the annular gradient wind hood 2. The wind level gradually increases along the axial direction, and the air volume delivered to the fuel tray 3 area increases axially. The air is delivered layer by layer on site to ensure combustion stability.

[0025] In addition, in actual application, the speed of flue gas flow in the flue directly determines the adjustment of the angles α and β. When the flow rate in the flue is low, the flue gas has little effect on the combustion stability of the supplementary combustion heating burner device, causing α to become smaller and β to become larger, and most of the flames will spray out of the fuel tray 3 and burn in the flue; when the flow rate in the flue is high, the flue gas has a greater effect on the combustion stability of the supplementary combustion heating burner device, causing α to become larger and β to become smaller, and the flame will be concentrated in the combustion tube, and the high-temperature flue gas of the combustion will mix with the high-speed incoming low-temperature flue gas to increase the overall flue gas temperature.

Claims

1. A high combustion stability supplementary combustion heating burner device, characterized in that: It comprises a fuel tray (3), a gas fuel pipe (4), a combustion-supporting air cylinder (1) and an annular gradient air hood (2); The fuel tray (3), the gas fuel pipe (4) and the combustion-supporting air cylinder (1) are arranged in sequence from the inside to the outside; a gas fuel passage is formed between the fuel tray (3) and the gas fuel pipe (4); a combustion-supporting air passage is formed between the gas fuel pipe (4) and the combustion-supporting air cylinder (1); an annular gradient air hood (2) is arranged at the outlet of the combustion-supporting air passage; a plurality of air outlet holes are provided on the annular gradient air hood (2); and a plurality of fuel nozzles are provided on the fuel tray (3); From inside to outside, the diameters of the air outlet holes on the annular gradient air hood (2) gradually increase; The fuel tray (3) is located in the top opening of the gas fuel pipe (4); The fuel injection ports are arranged in sequence along the circumferential direction.

2. The high combustion stability supplementary combustion heating burner device according to claim 1 is characterized in that: The included angle between the injection direction of the fuel nozzle and the center line of the fuel tray (3) is α, and 0°<α≤70°.

3. The high combustion stability supplementary combustion heating burner device according to claim 1 is characterized in that: The fuel tray (3) is located in the central area of ​​the annular gradient wind shield (2).

4. The high combustion stability supplementary combustion heating burner device according to claim 1 is characterized in that: The inclination angle of the side wall of the annular gradient wind shield (2) is β, wherein 10°<β≤50°.

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