Dual-fuel low-NOx flame-adjusting gas burner

Abstract

The utility model discloses a dual-fuel low NOx flame-adjusting gas burner which comprises a burner block, a shell, an air port and an air pipe, a first fuel pipe is arranged in the air pipe, the top of the first fuel pipe is connected with a first fuel cavity through a first conical pipe, and the first fuel cavity is connected with a first fuel port; a second fuel pipe is arranged in the first fuel pipe, the top of the second fuel pipe is connected with a second fuel cavity through a second conical pipe, a second fuel opening is connected to the second fuel cavity, and the air pipe, the first fuel pipe and the second fuel pipe are concentrically arranged; the first fuel pipe and the second fuel pipe provide two fuel gas channels for the burner, the channel drift diameter is designed according to the heat value of different fuel gas, the two kinds of fuel can be flexibly switched, and the working condition of the burner is not changed. And meanwhile, the fuel pipe and the fuel cavity are connected through the conical pipe, so that unnecessary vortexes cannot be generated in the gas transmission process, and the flame form can be stabilized.

Description

Technical Field

[0001] The utility model relates to a gas burner, in particular to a dual-fuel low-NOx flame-adjusting gas burner. Background Art

[0002] At present, for the burners often used in industrial furnaces, in order to improve combustion stability, most of them adopt the combustion mode of swirling mixing of gas and combustion-supporting air or intersecting at a certain angle. Since such a combustion mode has a fast reaction speed and strong flame rigidity, no measures to inhibit NOx are considered. In the actual production process, due to the high temperature in the combustion reaction zone, a large amount of thermal NOx is generated. The utility model patent with the patent number 2022228175967 and the name of a low-NOx gas burner has solved the problem of a large amount of thermal NOx generated during the combustion of existing burners. However, with the increasingly stringent requirements for environmental protection technologies and economic indicators of industrial furnaces, and in order to improve market competitiveness and product flexibility, it is sometimes necessary to switch between fuels with different economic efficiencies.

[0003] In the existing industrial production, in order to reduce production costs, it is required that the combustion system can adapt to fuels with different calorific values so as to flexibly adjust the fuel type according to the energy supply situation. Since fuels with different calorific values require different flow areas, and existing burners all have a single fuel inlet, when the burner is determined, the fuels that the corresponding combustion system can apply are basically determined. When the calorific value differences between two fuels are large, the existing burners at this time cannot meet the combustion requirements of different fuels, resulting in the failure to reduce production costs. Summary of the Utility Model

[0004] The technical task of the utility model is to provide a dual-fuel low-NOx flame-adjusting gas burner in view of the above deficiencies of the prior art.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a dual-fuel low-NOx flame-adjusting gas burner, including a burner brick, a housing, an air port and an air pipe. A first fuel pipe is arranged in the air pipe. The top of the first fuel pipe is connected to a first fuel chamber through a first conical pipe, and a first fuel port is connected to the first fuel chamber; a second fuel pipe is arranged in the first fuel pipe. The top of the second fuel pipe is connected to a second fuel chamber through a second conical pipe, and a second fuel port is connected to the second fuel chamber. The air pipe is concentrically arranged with the first fuel pipe and the second fuel pipe.

[0006] Further improvement: At least three nozzle partition plates are arranged on the circumferential wall of the bottom of the second fuel pipe, and a first fuel nozzle is formed between two adjacent nozzle partition plates.

[0007] Further improvement: A number of spiral vanes are provided on the circumference of the outer wall of the bottom of the first fuel pipe, and an inner air nozzle is formed between two adjacent spiral vanes.

[0008] Advantages of the present utility model: First of all, the first fuel pipe and the second fuel pipe provide two gas channels for the burner. According to the calorific value of different gases, the channel diameters are designed, and the two fuels can be flexibly switched without changing the working conditions of the burner. At the same time, the fuel pipe and the fuel chamber are connected through a conical pipe, so that unnecessary eddy currents will not be generated during the gas transmission process, which is beneficial to stabilizing the flame shape. Description of the drawings

[0009] Figure 1 is a schematic structural diagram of the present utility model.

[0010] Figure 2 is a bottom view of the nozzle brick of the present utility model.

[0011] Figure 3 is a schematic structural diagram of the first fuel pipe and the second fuel pipe of the present utility model.

[0012] In the figure: burner brick 1, outer shell 2, outer air nozzle 20, nozzle brick 21, air pipe 3, air nozzle 30, air partition 31, air port 32, distribution valve 33, inner air chamber 34, outer air chamber 35, first fuel pipe 4, first fuel nozzle 40, first fuel chamber 41, first fuel port 42, second fuel pipe 5, second fuel nozzle 50, second fuel chamber 51, second fuel port 52, first conical pipe 61, second conical pipe 62, nozzle partition 7, spiral vane 8. Specific implementation manner

[0013] The following makes a detailed description of the present utility model in conjunction with the drawings of the specification.

[0014] As shown in the figure, a dual-fuel low-NOx flame-adjusting gas burner includes a burner brick 1, an outer shell 2, an air port 32 and an air pipe 3. A first fuel pipe 4 is arranged in the air pipe 3. The top of the first fuel pipe 4 is connected to a first fuel chamber 41 through a first conical pipe 61, and a first fuel port 42 is connected to the first fuel chamber 41; a second fuel pipe 5 is arranged in the first fuel pipe 4. The top of the second fuel pipe 5 is connected to a second fuel chamber 51 through a second conical pipe 62, and a second fuel port 52 is connected to the second fuel chamber 51. The air pipe 3 is concentrically arranged with the first fuel pipe 4 and the second fuel pipe 5.

[0015] On the circumference of the outer wall at the bottom of the second fuel pipe 5, at least three nozzle partitions 7 are provided, and a first fuel nozzle 40 is formed between two adjacent nozzle partitions 7; on the circumference of the outer wall at the bottom of the first fuel pipe 4, a number of spiral blades 8 are provided, and an inner layer air nozzle 30 is formed between two adjacent spiral blades 8.

[0016] Its working principle is as follows: First, a nozzle brick 21 is provided in the burner brick 1, the outer shell 2 is connected to the nozzle brick 21, an outer layer air nozzle 20 is provided on the nozzle brick 21, the bottom of the second fuel pipe 5 is a second fuel nozzle 50, and at this time, from the center of the nozzle brick 21 from inside to outside are the second fuel nozzle 50, the first fuel nozzle 40, the inner layer air nozzle 30 and the outer layer air nozzle 20 in sequence.

[0017] Then, the air port 32 is communicated with the outer shell 2, the air partition 31 in the air port 32 is connected to the top of the air pipe 3, a distribution valve 33 is provided at the front end of the air partition 31, the air above the air partition 31 enters the inner layer air cavity 34 between the air pipe 3 and the first fuel pipe 4, and the air in the inner layer air cavity 34 sprays out from the inner layer air nozzle 30; the air below the air partition 31 enters the outer layer air cavity 35 between the air pipe 3 and the outer shell 2, and the air in the outer layer air cavity 35 sprays out from the outer layer air nozzle 20.

[0018] During operation, the low calorific value fuel with a calorific value of 2000 - 4000 kcal is connected to the first fuel port 42. At this time, the fuel enters the first fuel cavity 41, passes through the first conical tube 61 and then enters the first fuel pipe 4, and finally sprays out from the first fuel nozzle 40.

[0019] The high calorific value fuel with a calorific value of 4000 - 9000 kcal is connected to the second fuel port 52. The fuel enters the second fuel cavity 51, passes through the second conical tube 62 and then enters the second fuel pipe 5, and finally sprays out from the second fuel nozzle 50.

[0020] After the air passes through the inner layer air cavity 34, it will rotate when flowing through the spiral blades 8, generating a tangential flow velocity, and quickly reacts with the gas sprayed out from the first fuel nozzle 40 or the second fuel nozzle 50, shortening the flame length. The distribution valve 33 is combined to adjust the ratio of air in the inner layer air cavity 34 and the outer layer air cavity 35, so as to adjust the flame length of the burner.

[0021] When the distribution valve 33 is fully closed, the air only passes through the outer layer air cavity 35 and sprays out from the outer layer air nozzle 20, and reacts with the gas from the first fuel nozzle 40 or the second fuel nozzle 50. At this time, the NOx generation rate is the slowest and the NOx emission is the lowest. The first conical tube 61 and the second conical tube 62 prevent unnecessary eddy currents from being generated during the gas transmission process, which is beneficial to stabilizing the flame shape.

[0022] The above are only embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A dual-fuel low NOx flame-adjusting gas burner, comprising a burner brick, a shell, an air port and an air pipe, characterized in that: A first fuel pipe is provided in the air pipe, a first fuel cavity is connected to the top of the first fuel pipe via a first conical pipe, and a first fuel port is connected to the first fuel cavity; a second fuel pipe is provided in the first fuel pipe, a second fuel cavity is connected to the top of the second fuel pipe via a second conical pipe, and a second fuel port is connected to the second fuel cavity, and the air pipe is concentrically arranged with the first fuel pipe and the second fuel pipe.

2. A dual-fuel low NOx flame-adjusting gas burner according to claim 1, characterized in that: At least three nozzle baffles are arranged on the circumference of the outer wall of the bottom of the second fuel pipe, and the first fuel nozzle is formed between two adjacent nozzle baffles.

3. A dual-fuel low NOx flame-adjusting gas burner according to claim 1, characterized in that: A plurality of spiral blades are arranged on the circumference of the outer wall of the bottom of the first fuel pipe, and an inner layer air nozzle is formed between two adjacent spiral blades.

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