CN201190996Y - Combination gas burner - Google Patents

Abstract

The utility model discloses a combined gas burner, which comprises a pre-mixing device and a diffusion type combustion device. The pre-mixing device includes an air inlet chamber and a mixing chamber; There is a primary air valve, the mixing chamber is connected to the intake pipe, and a gas valve is installed at the end of the intake pipe; the diffusion combustion device includes a second air inlet chamber, a gas pipe and a diffusion combustion chamber; the second air inlet chamber is connected to the second air inlet A secondary air valve is installed on the second air inlet pipe, and the gas pipe and the second air inlet chamber are respectively communicated with the diffusion combustion chamber; the mixing chamber is connected to the gas pipe through the air supply pipe. The utility model cooperates with the different opening sequences of the primary air valve and the secondary air valve, and can easily realize three different combustion modes of the premixing type, the diffusion type and the secondary combustion-supporting diffusion type, satisfying different combustion requirements, and expanding the scope of this type of combustion. The scope of application of industrial furnaces.

Description

Combination gas burner

technical field

The utility model relates to a gas burner, in particular to a combined gas burner used in industrial furnaces.

Background technique

At present, there are mainly two combustion methods for gas burners used in industrial furnaces at home and abroad: diffusion type and secondary combustion diffusion type. Their combustion conditions are restricted by different gas components and combustion equipment. Only one combustion method is used. However, these two combustion methods have a common disadvantage, that is, combustion while mixing can not achieve full combustion, and it is easy to cause smoke in the flue gas. High content of carbon monoxide and nitrogen oxides. Of course, if the gas and air can be pre-mixed (mixed according to different gas components) before the gas is burned, after the flame is generated, the proper air ratio is given to provide secondary oxygen-assisted combustion. To achieve a good combustion effect. But at present, there is no gas burner that combines the three combustion methods of premixing, diffusion, and secondary combustion diffusion in industrial furnaces.

Contents of the invention

The purpose of this utility model is: to provide a combined gas burner which combines three combustion modes of premixing type, diffusion type and secondary combustion-supporting diffusion type. Finally, give the appropriate air ratio to provide secondary oxygen-assisted combustion to achieve a good combustion effect.

The technical scheme of the utility model is: a combined gas burner, which includes a pre-mixing device and a diffusion type combustion device, the pre-mixing device includes an air inlet chamber and a mixing chamber; the air inlet chamber is connected with an air inlet pipe, and the air inlet A primary air valve is installed on the pipe, the mixing chamber is connected to the intake pipe, and a gas valve is installed at the end of the intake pipe; the diffusion combustion device includes a second air inlet chamber, a gas pipe and a diffusion combustion chamber; the second air inlet chamber is connected to the second Two air inlet pipes, a secondary air valve is installed on the second air inlet pipe, the gas pipe and the second air inlet chamber are respectively communicated with the diffusion combustion chamber; the mixing chamber is connected to the gas pipe through the air supply pipe.

The more detailed technical solution of the utility model is: a combined gas burner, which includes a pre-mixing device and a diffusion combustion device, the pre-mixing device includes an air inlet chamber and a mixing chamber; the air inlet chamber is connected with an air inlet pipe, A primary air valve is installed on the air inlet pipe, the mixing chamber is connected to the air inlet pipe, and a gas valve is installed at the end of the air inlet pipe; the diffusion combustion device includes a second air inlet chamber, a gas pipe and a diffusion combustion chamber; Connect to the second air inlet pipe, the second air inlet pipe is equipped with a secondary air valve, the gas pipe and the second air inlet chamber are respectively communicated with the diffusion combustion chamber; the mixing chamber is connected to the gas pipe through the air supply pipe. The air inlet chamber is separated from the mixing chamber by an air inlet plate, and a number of air inlet holes are opened on the air inlet plate, and a number of shunt holes are circumferentially distributed on the upper ring of the pipe head of the air inlet pipe. At the same time, the outer casing of the gas pipe is provided with an air spacer, and an air injection plate is installed between the air spacer and the gas pipe, and the air injection plate separates the second air inlet cavity from the diffusion combustion chamber, and the gas pipe from the diffusion combustion chamber.

The more detailed technical solution of the utility model is: a combined gas burner, which includes a pre-mixing device and a diffusion combustion device, the pre-mixing device includes an air inlet chamber and a mixing chamber; the air inlet chamber is connected with an air inlet pipe , a primary air valve is installed on the air inlet pipe, the mixing chamber is connected to the air inlet pipe, and a gas valve is installed at the end of the air inlet pipe; the diffusion combustion device includes a second air inlet chamber, a gas pipe and a diffusion combustion chamber; the second air inlet chamber The upper part is connected with the second air inlet pipe, and a secondary air valve is installed on the second air inlet pipe. The gas pipe and the second air inlet chamber are respectively communicated with the diffusion combustion chamber; the mixing chamber is connected with the gas pipe through the air supply pipe. The air inlet chamber and the mixing chamber are separated by an air inlet plate, and there are several air inlet holes on the air inlet plate, and the air inlet holes are swirl holes; and the upper ring of the inlet pipe is circumferentially distributed with A plurality of distribution holes, and the axis of the distribution hole is perpendicular to the axis of the air inlet hole. At the same time, the outer casing of the gas pipe is provided with an air spacer, and an air injection plate is installed between the air spacer and the gas pipe, and the air injection plate separates the second air inlet cavity from the diffusion combustion chamber, and the gas pipe from the diffusion combustion chamber. In addition, the air injection plate is indented backwards in the shape of a few characters, and the outer wall of the indented part forms a circumferential partition with the inner wall of the air spacer. There are several air outlet holes distributed on the interlayer, and the end surface of the air injection plate located at the front end of the interlayer A number of air jet holes are distributed, and the air outlet holes and air jet holes are swirl holes.

The utility model can realize three different combustion functions in conjunction with different opening sequences of the primary air valve and the secondary air valve during specific work: 1. Open the primary air valve, close the secondary air valve, and open the gas valve, the gas The gas and air enter the mixing chamber from two different pipelines; the gas passes through the gas valve and is ejected from the split hole through the inlet pipe, and collides with the air ejected from the air inlet hole on the air inlet plate to synthesize gas and air. The mixed gas passes through the gas supply pipe and enters the gas pipe, and is ignited and burned through the jet holes on the jet plate to realize full premixed combustion. The resulting flame is short and hard, and the flame radiation is strong. 2. If the supply of the primary air valve is initially reduced, when the premixed gas enters the gas pipe, the secondary air valve is opened to allow the air to be ejected through the air outlet hole on the spacer layer between the gas pipe and the air spacer. The semi-premixed gas effect of the gas and air ejected from the hole, that is, the secondary oxygen-assisted combustion is carried out in the state of semi-premixed gas and air, and the secondary combustion-assisted diffusion type combustion is realized, thereby generating a longer flame. If the industrial furnace specifically adopts side firing, it is more convenient and practical to adjust the air volume of the primary air valve and the secondary air valve to change the injection speed and distance of the hot flue gas. 3. If the primary air valve is always closed at the initial stage of opening the gas valve and feeding gas, and the opening of the secondary air valve is increased, then the common diffusion combustion of current burners can be achieved.

The swirling holes referred to in the utility model are prior art, which have been disclosed in the applicant’s previous patents, and their specific forms are the channels distributed obliquely on the board surfaces such as the air inlet plate or the air jet plate, or It is also possible to arrange oblique wind vanes in normal channels to achieve the same purpose: that is, to make the air or gas passing through these channels form a cyclone and rotate, speed up the disturbance between air and gas, and improve their mixing effect. To improve the final combustion quality, the air inlet holes, air outlet holes and jet holes in the utility model all adopt swirl holes.

The utility model advantage is:

The combined gas burner of the utility model can easily realize three different combustion modes of premixing type, diffusion type and secondary combustion-supporting diffusion type in combination with the different opening sequences of the primary air valve and the secondary air valve to meet different combustion requirements. , expanding the scope of application of this type of industrial furnace, and compared with traditional gas burners, it has the following advantages: 1. It can increase the flame intensity; 2. It can save gas, and the gas saving rate is below 10%; 3. It can Reduce the exhaust gas temperature; 4. It can reduce the exhaust volume; 5. It can reduce the harmful gases such as carbon monoxide and nitrogen oxides in the flue gas.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is the structural representation of the specific embodiment of the utility model;

Among them: 1. Air inlet chamber; 2. Mixing chamber; 3. Air inlet pipe; 4. Primary air valve; 5. Air inlet pipe; 6. Gas valve; 7. Second air inlet chamber; 8. Gas pipe; 9. Diffusion combustion chamber; 10. Second air inlet pipe; 11. Secondary air valve; 12. Air supply pipe; 13. Air inlet plate; 14. Air inlet hole; 15. Diverter hole; 16. Air spacer; 17. Air injection plate; 18, interlayer; 19, air outlet hole; 20, jet hole.

Detailed ways

Embodiment: As shown in Figure 1, it is a specific implementation of the utility model combined gas burner, which includes a premixing device and a diffusion combustion device, and the premixing device includes an air inlet chamber 1 and a mixing chamber 2; The air chamber 1 is connected with the air inlet pipe 3, the primary air valve 4 is installed on the air inlet pipe 3, the mixing chamber 2 is connected with the air inlet pipe 5, and the end of the air inlet pipe 5 is equipped with a gas valve 6; the diffused combustion device includes a second air inlet Air chamber 7, gas pipe 8 and diffusion combustion chamber 9; the second air inlet chamber 7 is connected with a second air inlet pipe 10, and a secondary air valve 11 is installed on the second air inlet pipe 10, and the gas pipe 8 and the first air inlet pipe The two air inlet chambers 7 communicate with the diffusion combustion chamber 9 respectively; the mixing chamber 2 is connected to the gas pipe 8 through the air supply pipe 12 .

In this embodiment, the air inlet chamber 1 and the mixing chamber 2 are separated by an air inlet plate 13, and a number of air inlet holes 14 are opened on the air inlet plate 13, and the air inlet holes 14 are swirl holes; and the air inlet pipe A plurality of distribution holes 15 are distributed circumferentially on the upper ring of the pipe head of 5, and the axis of the distribution holes 15 is perpendicular to the axis of the air inlet hole 14.

The gas pipe 8 is provided with an air spacer 16, and an air injection plate 17 is installed between the air spacer 16 and the gas pipe 8. The air injection plate 17 connects the second air inlet chamber 7 with the diffusion combustion chamber 9, and the gas pipe 8 with the diffusion chamber. The combustion chambers 9 are partitioned separately. The air injection plate 17 is indented backwards in the shape of a few characters, and the outer wall of the indented part and the inner wall of the air spacer 16 form a circumferential interlayer 18, and a plurality of air outlet holes 19 are distributed on the interlayer 18, and the front end of the interlayer 18 Several air injection holes 20 are distributed on the end surface of the air injection plate 17 . And the air outlet hole 19 and the jet hole 20 are swirl holes.

In the specific work of this embodiment, with the different opening sequences of the primary air valve 4 and the secondary air valve 11, three different combustion functions can be realized: 1. Open the primary air valve 4, close the secondary air valve 11, and open The gas valve 6, gas and air enter the mixing chamber 2 from two different pipelines; wherein the gas passes through the gas valve 6 and is ejected from the split hole 15 through the air inlet pipe 5, and is connected with the air inlet hole 14 on the air inlet plate 13 The ejected air collides to form a mixture of gas and air. Since the air inlet 14 is a swirl hole and the axis of the diverter hole 15 is vertically arranged with the axis of the air inlet 14, the gas and air are mixed more fully. The mixed gas passes through the air supply pipe 12, enters the gas pipe 8, and is ejected through the air injection hole 20 on the air injection plate 17 to ignite and burn to realize full premixed combustion. The resulting flame is short and hard, with strong flame radiation and high flame intensity . 2. If the supply of the primary air valve 4 is initially reduced, when the premixed gas enters the gas pipe 8, the secondary air valve 11 is opened to allow the air to pass through the gas pipe 8 and the air outlet on the spacer layer 18 of the air spacer 16 The hole 19 ejects and the semi-premixed gas of the gas and air ejected from the jet hole 20, that is, the secondary oxygen-assisted combustion is carried out under the state of the semi-premixed gas and air, and the secondary combustion-supported diffusion type combustion is realized. This produces a longer flame. If the industrial furnace specifically adopts side firing, the air volume of the primary air valve 4 and the secondary air valve 11 can actually be adjusted to change the injection speed and distance of the hot flue gas volume, which is more convenient and practical. Three, if at the initial stage of opening the gas valve 6 and sending in the gas, the primary air valve 4 is always closed, and the opening of the secondary air valve 11 is increased, then the common diffusion combustion of the current burner can be achieved.

The combined gas burner of the utility model, in conjunction with the different opening sequences of the primary air valve 4 and the secondary air valve 11, can easily realize three different combustion modes of premixing type, diffusion type and secondary combustion-supporting diffusion type to meet different requirements. Combustion requirements have expanded the scope of application of this type of industrial furnace, and compared with traditional gas burners, it has the following advantages: 1. It can increase the flame intensity; 2. It can save gas, and the gas saving rate is below 10%; 3. 1. It can reduce the exhaust gas temperature; 4. It can reduce the exhaust volume; 5. It can reduce the harmful gases such as carbon monoxide and nitrogen oxides in the flue gas.

Claims (8)

1. A combination gas burner is characterized in that: it comprises a premixing device and a diffusion type combustion device, and said premixing device comprises an air inlet chamber (1) and a mixing chamber (2); on the air inlet chamber (1) Connect to the air inlet pipe (3), the primary air valve (4) is installed on the air inlet pipe (3), the mixing chamber (2) is connected to the air inlet pipe (5), and the gas valve (6) is installed at the end of the air inlet pipe (5) ); the diffusion combustion device comprises a second air inlet chamber (7), a gas pipe (8) and a diffusion combustion chamber (9); the second air inlet chamber (7) is connected with a second air inlet pipe (10), and the second A secondary air valve (11) is installed on the air inlet pipe (10), and the gas pipe (8) and the second air inlet chamber (7) communicate with the diffusion combustion chamber (9) respectively; Air pipe (12) connects gas pipe (8). 2. The combined gas burner according to claim 1, characterized in that the air inlet chamber (1) and the mixing chamber (2) are separated by an air inlet plate (13), and the air inlet plate (13) is provided with Several air inlet holes (14). 3. The combined gas burner according to claim 2, characterized in that there are several diversion holes (15) distributed in the circumferential direction on the pipe head of the inlet pipe (5). 4. The combined gas burner according to claim 3, characterized in that the axis of the split hole (15) is perpendicular to the axis of the air inlet hole (14). 5. The combined gas burner according to claim 2, 3 or 4, characterized in that the air inlet hole (14) is a swirl hole. 6. The combined gas burner according to claim 1, characterized in that the outer casing of the gas pipe (8) is provided with an air spacer (16), and an air jet is installed between the air spacer (16) and the gas pipe (8). Plate (17), the air injection plate (17) separates the second air inlet cavity (7) from the diffusion combustion chamber (9), and the gas pipe (8) from the diffusion combustion chamber (9). 7. The combined gas burner according to claim 5, characterized in that the air injection plate (17) is indented backwards in the shape of a few characters, and the outer wall of the indented part and the inner wall of the air spacer (16) form a circumferential partition (18), some air outlet holes (19) are distributed on the interlayer (18), and some air injection holes (20) are distributed on the end face of the air jet plate (17) positioned at the front end of the interlayer (18). 8. The combined gas burner according to claim 7, characterized in that both the air outlet hole (19) and the jet hole (20) are swirl holes.

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