Split burner of heating furnace

Abstract

The utility model discloses a heating furnace split burner, which relates to the technical field of burners and comprises a burning head and an outer cylinder, the burning head is connected with the outer cylinder through a flange, the inner side of the outer cylinder is fixedly connected with an inner cylinder, an annular gas flow channel is formed between the outer cylinder and the inner cylinder, and the rear end of the burning head is communicated with a first air cylinder. A second air cylinder is fixedly connected to the outer surface of the outer cylinder and communicates with the interior of the annular gas flow channel, a gas fuel nozzle is fixedly connected to the inner side of the combustion head, and a plurality of evenly-distributed primary air holes are formed in the position, located on the outer side of the gas fuel nozzle, of the rear end of the combustion head in a penetrating mode. According to the utility model, the primary air holes, the secondary air holes and the tertiary air holes are arranged to form a staged combustion process of spiral premixing, circumferential oxygen deficiency and axial afterburning, so that not only is the mixing uniformity of fuel and air improved, but also the generation of nitrogen oxides can be reduced, thereby reducing the pollution to the environment.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, specifically to a split burner for a heating furnace. Background Technology

[0002] The furnace burner is the core component of industrial heating equipment. Its function is to mix fuel with air and ignite it to provide a heat source for the furnace.

[0003] In traditional burners, fuel and air are mostly mixed in a single chamber, resulting in low uniformity of mixing and incomplete combustion, leading to energy waste. Furthermore, the combustion process can generate large amounts of nitrogen oxides due to localized high temperatures, causing environmental pollution. Therefore, a split burner for heating furnaces is proposed to address the aforementioned problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, a split burner for heating furnace is provided. This technical solution solves the problems mentioned in the background art that the fuel and air in traditional burners are mostly mixed in a single cavity, resulting in low mixing uniformity, which easily leads to incomplete fuel combustion, causing energy waste, and the generation of a large amount of nitrogen oxides due to local high temperature during combustion, causing environmental pollution.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A split burner for a heating furnace includes a burner head and an outer cylinder, which are connected by a flange. An inner cylinder is fixedly connected to the inner side of the outer cylinder, forming an annular gas flow channel between the outer and inner cylinders. A first air duct is connected to the rear end of the burner head, and a second air duct is fixedly connected to the outer surface of the outer cylinder, communicating with the interior of the annular gas flow channel. A gaseous fuel nozzle is fixedly connected to the inner side of the burner head. Several uniformly distributed primary air holes are opened through the rear end of the burner head outside the gaseous fuel nozzle. Several uniformly distributed spiral guide grooves are opened on the inner wall of the burner head. Several uniformly distributed first-stage swirl blades are fixedly connected to the inner side of the inner cylinder. Several uniformly distributed secondary air holes are opened through the outer surface of the outer cylinder in front of the first-stage swirl blades. Several uniformly distributed tertiary air holes are opened through the front edge of the inner cylinder. An igniter is fixedly connected to the front end of the flange of the outer cylinder.

[0007] Preferably, the secondary air vent is inclined at 5° toward the direction of the first air duct.

[0008] Preferably, both the first and second air ducts have a connecting flange fixedly connected to the end furthest from the outer duct.

[0009] Preferably, the front end of the combustion head is conical.

[0010] Preferably, the inlet of the gas fuel nozzle is connected to a fuel pipe, and the other end of the fuel pipe passes through the outer surface of the first air duct and extends to the outside of the first air duct.

[0011] Preferably, the inner walls of both the inner and outer cylinders are provided with a ceramic coating.

[0012] The advantages of this utility model compared with the prior art are:

[0013] This solution proposes a split burner for a heating furnace. By setting primary air holes, secondary air holes, and tertiary air holes, a staged combustion process is formed, which includes spiral premixing, circumferential oxygen depletion, and axial combustion supplementation. This not only improves the uniformity of fuel-air mixing but also reduces the generation of nitrogen oxides, thereby reducing environmental pollution. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of the first-stage swirl blade in this utility model;

[0017] Figure 4 This is a schematic diagram of the connection of the second air duct in this utility model.

[0018] The numbers on the map are:

[0019] 1. Combustion head; 2. Outer cylinder; 3. Inner cylinder; 4. Annular gas flow channel; 5. First air duct; 6. Second air duct; 7. Gas fuel nozzle; 8. Primary air hole; 9. Spiral guide groove; 10. First-stage swirl vane; 11. Secondary air hole; 12. Tertiary air hole; 13. Igniter; 14. Fuel pipeline; 15. Connecting flange. Detailed Implementation

[0020] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0021] Reference Figures 1-4As shown, a split burner for a heating furnace includes a burner head 1 and an outer cylinder 2, which are connected by a flange. An inner cylinder 3 is fixedly connected to the inner side of the outer cylinder 2, forming an annular gas flow channel 4 between the outer cylinder 2 and the inner cylinder 3. A first air duct 5 is connected to the rear end of the burner head 1, and a second air duct 6 is fixedly connected to the outer surface of the outer cylinder 2. The second air duct 6 communicates with the interior of the annular gas flow channel 4. A gas fuel nozzle 7 is fixedly connected to the inner side of the burner head 1. Several uniformly distributed primary air holes 8 are opened through the rear end of the burner head 1 outside the gas fuel nozzle 7. Several uniformly distributed spiral guide grooves 9 are opened on the inner wall of the burner head 1. Several uniformly distributed first-stage swirl blades 10 are fixedly connected to the inner side of the inner cylinder 3. Several uniformly distributed secondary air holes 11 are opened through the outer surface of the outer cylinder 2 in front of the first-stage swirl blades 10. Several uniformly distributed tertiary air holes 12 are opened through the front edge of the inner cylinder 3. An igniter 13 is fixedly connected to the front end of the flange of the outer cylinder 2.

[0022] Furthermore, the inlet of the gas fuel nozzle 7 is connected to a fuel pipe 14, and the other end of the fuel pipe 14 extends through the outer surface of the first air duct 5 to the outside of the first air duct 5 and is connected to the fuel storage device.

[0023] Furthermore, the ends of the first air duct 5 and the second air duct 6 away from the outer cylinder 2 are both fixedly connected with connecting flanges 15. The first air duct 5 and the second air duct 6 are both connected to external air supply devices to guide air into the burner.

[0024] Furthermore, the front end of the burner head 1 is conical. After the first air duct 5 is connected to the external air supply device, it can guide the air to the primary air hole 8 to form primary air. At the same time, it works with the fuel pipe 14 to transport fuel into the burner head 1. The spiral guide groove 9 on the inner side of the burner head 1 will guide the primary air and fuel gas to mix spirally to form a rotating premixed airflow, which improves the uniformity of mixing. The conical design at the front end of the burner head 1 can contract the airflow, increase the outlet velocity, and avoid backfire.

[0025] Furthermore, the first-stage swirl blade 10 enables the primary air delivered by the burner head 1 to generate a high-speed swirl, which mixes with the fuel a second time, further improving the uniformity of the mixture.

[0026] Furthermore, the secondary air vent 11 is opened at an angle of 5° towards the direction of the first air duct 5. The angled secondary air vent 11 causes the secondary air to flow along the tangential direction of the inner cylinder 3, forming an oxygen-deficient environment around the combustion zone, reducing the flame peak, and thus reducing the generation of nitrogen oxides.

[0027] Furthermore, the tertiary air hole 12 can axially supplement tertiary air to perform secondary mixing and combustion of incompletely burned CO and carbon particles, thereby improving combustion efficiency and reducing the loss of unburned carbon.

[0028] Furthermore, the inner walls of both the inner cylinder 3 and the outer cylinder 2 are coated with ceramic.

[0029] Working principle: During use, natural gas enters the burner head 1 through the gas fuel nozzle 7, mixes with the primary air in the spiral guide groove 9, and is then sent out through the burner head 1. At the same time, the igniter 13 ignites the fuel. The inclined secondary air hole 11 causes the secondary air to flow tangentially along the inner cylinder 3, creating an oxygen-deficient environment around the combustion zone, reducing the flame peak and thus reducing the generation of nitrogen oxides. The tertiary air is axially supplemented through the tertiary air hole 12 at the front end of the inner cylinder 3, which performs secondary mixing and combustion of unburned CO and carbon particles, improving combustion efficiency and reducing the loss of unburned carbon.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A split burner for a heating furnace, characterized in that, The device includes a burner head (1) and an outer cylinder (2), which are connected by a flange. An inner cylinder (3) is fixedly connected to the inner side of the outer cylinder (2), and an annular gas flow channel (4) is formed between the outer cylinder (2) and the inner cylinder (3). The rear end of the burner head (1) is connected to a first air duct (5), and a second air duct (6) is fixedly connected to the outer surface of the outer cylinder (2). The second air duct (6) is connected to the interior of the annular gas flow channel (4). A gas fuel nozzle (7) is fixedly connected to the inner side of the burner head (1), and the rear end of the burner head (1) is located at the gas fuel nozzle. (7) has several uniformly distributed primary air holes (8) through the outer side, and several uniformly distributed spiral guide grooves (9) are opened on the inner wall of the burner head (1). Several uniformly distributed first-stage swirl blades (10) are fixedly connected to the inner side of the inner cylinder (3). Several uniformly distributed secondary air holes (11) are opened through the outer surface of the outer cylinder (2) in front of the first-stage swirl blades (10). Several uniformly distributed tertiary air holes (12) are opened through the front edge of the inner cylinder (3). An igniter (13) is fixedly connected to the front end of the flange of the outer cylinder (2).

2. The split burner for a heating furnace according to claim 1, characterized in that: The secondary air hole (11) is opened at an angle of 5° towards the direction of the first air duct (5).

3. The split burner for a heating furnace according to claim 1, characterized in that: Both the first air duct (5) and the second air duct (6) have a connecting flange (15) fixedly connected to the end away from the outer cylinder (2).

4. A split burner for a heating furnace according to claim 1, characterized in that: The front end of the combustion head (1) is conical.

5. A split burner for a heating furnace according to claim 1, characterized in that: The gas fuel nozzle (7) is connected to a fuel pipe (14) at its inlet. The other end of the fuel pipe (14) passes through the outer surface of the first air duct (5) and extends to the outside of the first air duct (5).

6. A split burner for a heating furnace according to claim 1, characterized in that: The inner walls of both the inner cylinder (3) and the outer cylinder (2) are provided with a ceramic coating.

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