Combustion head for premixing fuel gas and air

Abstract

The utility model provides a combustion head for premixing fuel gas and air, which comprises an outer shell, a premixing chamber and an air flow channel for introducing air are arranged in the outer shell, the premixing chamber is communicated with the air flow channel through an air inlet pipe, and an air inlet hole arranged on the air inlet pipe is arranged in the middle of the premixing chamber; an air inlet and an air outlet are formed in the two ends of the outer shell correspondingly and communicate with each other through the premixing cavity; the air inlet is used for introducing air and fuel gas, and the air outlet is used for discharging premixed gas formed by mixing the air and the fuel gas. Air and fuel gas are premixed at the gas inlet for the first time, the air entering the premixing chamber from the gas inlet hole and the primary premixed gas are premixed for the second time to obtain secondary premixed gas, the air is added into the premixing chamber again through the gas flow channel, and the air sprayed into the premixing chamber from the gas inlet hole applies thrust to the primary premixed gas to play a role in mixing intervention. And the premixing uniformity of the air and the fuel gas is improved.

Description

Technical Field

[0001] The utility model relates to a gas combustion head structure, in particular to a combustion head used for premixing gas and air. Background Art

[0002] In combustion equipment, the performance of the burner head has an important impact on combustion efficiency, pollutant emissions, flame stability, etc. Traditional burners usually premix air and gas once before entering the combustion chamber. However, the premixed gas may experience local oxygen deficiency or oxygen enrichment during the combustion process, affecting the stability of the flame and even generating a large amount of pollutants. Therefore, it is worth studying how to optimize the premixing method of the existing burner head and solve the local oxygen deficiency or oxygen enrichment phenomenon that may occur during the combustion of the premixed gas. Utility Model Content

[0003] The utility model aims to provide a combustion head for premixing gas and air, and the technical problem to be solved is to improve the uniformity of premixing air and gas.

[0004] The utility model is realized by the following technical solutions:

[0005] A burner head for premixing gas and air, comprising a carrier, wherein the inner cavity and side wall of the carrier are respectively provided with a premixing chamber and an air flow channel for introducing air, an air inlet pipe connected to the air flow channel is provided in the premixing chamber, and air inlet holes provided on the air inlet pipe are distributed in the middle part of the premixing chamber;

[0006] The two ends of the outer shell are respectively provided with an air inlet and an air outlet connected to the premixing chamber;

[0007] The air inlet is used to introduce air and fuel gas into the premixing chamber, and the air outlet is used to flow out the premixed gas mixed in the premixing chamber.

[0008] When the air and the gas are introduced into the above-mentioned air inlet, they are premixed once to obtain a premixed gas. The premixing only limits the mixing space of the air and the gas, and does not interfere with the mixing process of the air and the gas. The premixing is completed according to the natural flow of the air and the gas, and the mixing force is small, and uneven mixing is easy to occur, resulting in local hypoxia or oxygen enrichment during combustion, affecting the stability of the flame, and even generating a large amount of pollutants. In order to further solve the problem of uniform mixing of air and gas, an air inlet is set on the way from the primary premixed gas to the gas outlet, and the air entering the premixing chamber from the air inlet is premixed with the primary premixed gas for a second time to obtain a secondary premixed gas. Air is added to the premixing chamber again through the air flow channel to improve the combustion-supporting effect. In addition, the air is squeezed in the air inlet pipe, and the air sprayed into the premixing chamber from the air inlet exerts a thrust on the primary premixed gas, which not only plays a role in intervening the mixing, but also improves the uniformity of the premixing of air and gas; the sprayed air is also mixed into the primary premixed gas to increase the oxygen content of the secondary premixed gas.

[0009] Furthermore, there are more than two air inlet holes on the air inlet pipe, and the air inlet holes are arranged at equal intervals along the axial direction of the air inlet pipe.

[0010] The above-mentioned air inlet holes are arranged at equal intervals in the length direction of the air inlet pipe. The air in the air inlet pipe flows along the length direction of the air inlet pipe. The air sprayed into the premixing chamber is mixed with the flowing primary premixed gas at equal intervals, further improving the uniformity of the premixing of air and gas.

[0011] Furthermore, the length direction of the air inlet pipe extends along the radial direction of the premixing chamber, and the air flow direction of the air sprayed from the air inlet hole into the premixing chamber is the same as the axial direction of the premixing chamber.

[0012] The above-mentioned intake pipe is arranged in the radial direction of the premixing chamber. At time t (time t can be any time), the intake holes spray air at equal intervals on the radial section of the premixing chamber. The sprayed air mixes with the primary premixed gas of the same radial section, pushes the primary premixed gas, and mixes with it, further improving the uniformity of the premixing of air and gas.

[0013] Furthermore, the air inlet hole is provided on a side of the air inlet pipe facing the air outlet.

[0014] Taking into account the flame combustion stability, the air ejected from the above-mentioned air inlet hole is mixed with the primary premixed gas, and then pushes the mixed secondary premixed gas toward the outlet, thereby solving the problem of unstable flame caused by insufficient or unstable air outlet.

[0015] Furthermore, the above-mentioned air intake pipe is provided with a plurality of them;

[0016] Along the axial direction of the premixing chamber, adjacent intake pipes are arranged alternately, and when adjacent intake pipes are projected onto a radial cross section of the premixing chamber, an angle exists between the adjacent intake pipes.

[0017] When the primary premixed gas collides with the intake pipe during natural flow, the primary premixed gas changes its flow direction after the collision, that is, it flows along the outer wall of the intake pipe and undergoes preliminary secondary premixing. In the premixing process at this time, the air ejected from the intake hole is not mixed into the primary premixed gas, and the primary premixed gas is intervened and mixed by colliding with the intake pipe; the air ejected from the intake hole is then premixed with the primary premixed gas to obtain a secondary premixed gas; when the mixed gas passes through a plurality of staggered intake pipes, the intervention operation is repeated more than once each time it passes through an intake pipe arranged along the axial direction of the premixing chamber. The staggered intake pipes can change the airflow direction of the premixed gas multiple times, redistribute the premixed gas, and improve the uniformity of the premixing of air and fuel gas.

[0018] Furthermore, adjacent intake pipes are arranged in parallel along the radial direction of the premixing chamber.

[0019] Furthermore, the carrier further comprises an outer shell and an inner shell, the inner shell is sleeved in the inner cavity of the outer shell, and a gap is provided between the inner wall of the outer shell and the outer wall of the inner shell; the two ends of the inner shell and the outer shell are connected respectively by a first end plate and a second end plate;

[0020] The inner cavity of the inner shell forms a premixing chamber;

[0021] The inner shell, the outer shell, the first end plate and the second end plate enclose the airflow channel.

[0022] The airflow channel formed by the outer wall of the inner shell, the inner wall of the outer shell, the first end plate and the second end plate simplifies the structure of the airflow channel. Before the air in the airflow channel is ejected, the air flows on the outer wall of the inner shell to achieve a cooling effect.

[0023] Furthermore, at least one end of the air inlet pipe passes through the side wall of the inner shell and communicates with the air flow channel.

[0024] Furthermore, both ends of the air inlet pipe pass through the side wall of the inner shell and communicate with the air flow channel.

[0025] The air in the above-mentioned air flow channel can enter from both ends of the air inlet pipe.

[0026] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0027] When the air and the gas are introduced into the above-mentioned air inlet, they are premixed once to obtain a premixed gas. The premixing only limits the mixing space of the air and the gas, and does not interfere with the mixing process of the air and the gas. The premixing is completed according to the natural flow of the air and the gas, and the mixing force is small, and uneven mixing is easy to occur, resulting in local hypoxia or oxygen enrichment during combustion, affecting the stability of the flame, and even generating a large amount of pollutants. In order to further solve the problem of uniform mixing of air and gas, an air inlet is set on the way from the primary premixed gas to the gas outlet, and the air entering the premixing chamber from the air inlet is premixed with the primary premixed gas for a second time to obtain a secondary premixed gas. Air is added to the premixing chamber again through the air flow channel to improve the combustion-supporting effect. In addition, the air is squeezed in the air inlet pipe, and the air sprayed into the premixing chamber from the air inlet exerts a thrust on the primary premixed gas, which not only plays a role in intervening the mixing, but also improves the uniformity of the premixing of air and gas; the sprayed air is also mixed into the primary premixed gas to increase the oxygen content of the secondary premixed gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0029] Figure 1 is a cross-sectional view of the combustion head;

[0030] Figure 2 This is a plan view of the combustion head as viewed from the direction of the gas outlet.

[0031] Marks and corresponding parts names in the attached drawings:

[0032] 1. Outer shell; 2. Inner shell; 3. Air flow channel; 4. First end plate; 5. Second end plate; 6. Premixing chamber; 7. Air inlet; 8. Air inlet pipe; 9. Air inlet hole; 10. Air outlet. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0034] Example 1

[0035] Combination Figure 1 and Figure 2, this embodiment 1 provides a burner head for premixing gas and air, including a carrier, the carrier including an outer shell 1 and an inner shell 2, the inner shell 2 is sleeved in the outer shell 1, and the two ends of the inner shell 2 and the outer shell 1 are connected respectively by a first end plate 4 and a second end plate 5; the outer wall of the inner shell 2, the inner wall of the outer shell 1, the first end plate 4 and the second end plate 5 enclose an air flow channel 3, and the second end plate 5 is provided with a plurality of through holes, and air flows into the air flow channel 3 from the through holes; a premixing chamber 6 is provided in the inner shell 2, and the premixing chamber 6 is used to mix air and gas; the premixing chamber 6 and the air flow channel 3 are connected through an air inlet pipe 8, and the air inlet hole 9 provided on the air inlet pipe 8 is located in the middle part of the premixing chamber 6;

[0036] An air inlet 7 and an air outlet 10 are respectively provided at both ends of the outer shell 1, and the air inlet 7 and the air outlet 10 are connected through a premixing chamber 6;

[0037] The air inlet 7 is used to introduce air and fuel gas, and the air outlet 10 is used to discharge premixed gas obtained by mixing air and fuel gas.

[0038] In a specific embodiment, the air inlet pipe 8 passes through the side wall of the middle part of the inner shell 2 and is connected with the air flow channel 3 . The air in the air flow channel 3 can only enter from one end of the air inlet pipe 8 .

[0039] The airflow channel 3 formed by the inner shell 2, the outer shell 1, the first end plate 4 and the second end plate 5 simplifies the structure of the airflow channel 3. Before the air in the airflow channel 3 is ejected, the air flows on the outer wall of the inner shell 2 to achieve a cooling effect.

[0040] When the air and the gas are introduced into the air inlet 7, they are premixed once to obtain a premixed gas. The premixing only limits the mixing space of the air and the gas, and does not interfere with the mixing process of the air and the gas. The premixing is completed according to the natural flow of the air and the gas, and the mixing force is small, which is prone to uneven mixing, resulting in local hypoxia or oxygen enrichment during combustion, affecting the stability of the flame, and even generating a large amount of pollutants. In order to further solve the problem of uniform mixing of the air and the gas, a premixed gas is premixed on the way to the gas outlet 10. An air inlet hole 9 is arranged in the middle, and the air entering the premixing chamber 6 from the air inlet hole 9 is premixed with the primary premixed gas for a second time to obtain the secondary premixed gas, and air is added to the premixing chamber 6 again through the air flow channel 3 to improve the combustion-supporting effect. Moreover, the air is squeezed in the air inlet pipe 8, and the air sprayed into the premixing chamber 6 from the air inlet hole 9 applies thrust to the primary premixed gas, which not only plays a role in intervening mixing and improves the uniformity of the premixing of air and fuel gas; the sprayed air is also mixed into the primary premixed gas to increase the oxygen content of the secondary premixed gas.

[0041] Example 2

[0042] Combination Figure 1 and Figure 2 On the basis of Example 1, a plurality of air inlet holes 9 are provided on the air inlet pipe 8 , and the plurality of air inlet holes 9 are arranged at equal intervals along the axial direction of the air inlet pipe 8 .

[0043] The above-mentioned air inlet holes 9 are arranged at equal intervals in the length direction of the air inlet pipe 8. The air in the air inlet pipe 8 flows along the length direction of the air inlet pipe 8. The air sprayed into the premixing chamber 6 is mixed with the flowing primary premixed gas at equal intervals, further improving the uniformity of the premixing of air and gas.

[0044] In a specific embodiment, the length direction of the air inlet pipe 8 extends along the radial direction of the premixing chamber 6, and laterally blocks the flow of the premixed gas; at the moment when the air is ejected from the air inlet hole 9 to the premixing chamber 6, the airflow direction of the ejected air is the same as the axial direction of the premixing chamber 6, that is, the airflow path of the air after entering the premixing chamber 6 is the same as the airflow path of the premixed gas after one premixing.

[0045] The direction of the air inlet hole 9 may be the same as the airflow direction of the premixed gas after the primary premixing, or may be opposite to it.

[0046] The above-mentioned intake pipe 8 is arranged in the radial direction of the premixing chamber 6. At time t (time t can be any time), the intake holes 9 spray air at equal intervals on the radial section of the premixing chamber 6. The sprayed air mixes with the primary premixed gas of the same radial section, pushes the primary premixed gas, and mixes with it, further improving the uniformity of the premixing of air and gas.

[0047] Example 3

[0048] Combination Figure 1 and Figure 2 On the basis of Example 2, the air inlet hole 9 is opened on the side of the air inlet pipe 8 facing the air outlet 10; the direction of the air inlet hole 9 is the same as the air flow direction of the premixed gas after the primary premixing.

[0049] Taking into account the flame combustion stability, the air ejected from the above-mentioned air inlet 9 is mixed with the primary premixed gas, and then pushes the mixed secondary premixed gas toward the outlet 10, thereby solving the problem of unstable flame caused by insufficient or unstable gas output from the outlet 10.

[0050] Example 4

[0051] Combination Figure 1 and Figure 2 , based on the embodiment 3, the above-mentioned air intake pipe 8 is provided with a plurality of;

[0052] Along the axial direction of the premixing chamber 6 , adjacent intake pipes 8 are staggered, and when adjacent intake pipes 8 are projected onto the radial section of the premixing chamber 6 , there is an angle between the adjacent intake pipes 8 ; along the radial direction of the premixing chamber 6 , adjacent intake pipes 8 are parallelly arranged.

[0053] Exemplarily, two groups of intake pipes 8 are arranged along the axial direction of the premixing chamber 6, one group of intake pipes 8 is composed of three intake pipes 8 arranged in parallel, one group of intake pipes 8 is located on the same radial section of the premixing chamber 6, and the two groups of intake pipes 8 are staggered, that is, the two groups of intake pipes 8 are located on different radial sections of the premixing chamber 6, and when the adjacent intake pipes 8 are projected onto the radial section of the premixing chamber 6, there is an angle between the adjacent intake pipes 8.

[0054] When the primary premixed gas collides with a group of intake pipes 8 near the air inlet 7 during natural flow, the primary premixed gas changes its flow direction after the collision, that is, it flows along the outer wall of the group of intake pipes 8 to perform preliminary mixing of secondary premixing. In the mixing process that occurs here, the air ejected from the air inlet hole 9 is not mixed into the primary premixed gas, and the primary premixed gas collides with the intake pipe 8 to intervene in the mixing. When the primary premixed gas flows along the outer wall of the group of intake pipes 8 to the air inlet hole 9, the primary premixed gas is premixed with the air ejected from the air inlet hole 9 on the radial section to obtain the secondary premixed gas. Mixed gas; the mixed secondary premixed gas collides with a group of intake pipes 8 near the outlet 10 during natural flow, and the secondary premixed gas after the collision changes the flow direction, that is, it flows along the outer wall of the group of intake pipes 8 to perform secondary premixing again. The mixing process occurring here utilizes the secondary premixed gas to collide with the group of intake pipes 8 to achieve the purpose of intervention mixing. When the secondary premixed gas flows along the outer wall of the group of intake pipes 8 to the intake hole 9, the secondary premixed gas is premixed with the air ejected from the intake hole 9 on the radial section to obtain the final secondary premixed gas.

[0055] The staggered air intake pipes 8 can change the airflow direction of the premixed gas multiple times, redistribute the premixed gas, and improve the uniformity of the premixing of air and gas.

[0056] Example 5

[0057] Combination Figure 1 and Figure 2 Both ends of the air inlet pipe 8 pass through the side wall of the middle part of the inner shell 2 and are connected to the air flow channel 3.

[0058] The air in the air flow channel 3 can enter from both ends of the air inlet pipe 8 .

[0059] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A burner head for premixing gas and air, characterized in that: The invention comprises a carrier, wherein the inner cavity and the side wall of the carrier are respectively provided with a premixing chamber (6) and an air flow channel (3) for introducing air, an air inlet pipe (8) connected to the air flow channel (3) is provided in the premixing chamber (6), and air inlet holes (9) provided on the air inlet pipe (8) are distributed in the middle part of the premixing chamber (6); The carrier comprises an outer shell (1), and an air inlet (7) and an air outlet (10) communicating with a premixing chamber (6) are respectively arranged at two ends of the outer shell (1). The air inlet (7) is used to introduce air and fuel gas into the premixing chamber (6), and the air outlet (10) is used to flow out the premixed gas mixed in the premixing chamber (6).

2. A burner head for premixing gas and air according to claim 1, characterized in that: There are more than two air inlet holes (9) on the air inlet pipe (8), and the air inlet holes (9) are arranged at equal intervals along the axial direction of the air inlet pipe (8).

3. A burner head for premixing gas and air according to claim 2, characterized in that: The length direction of the air inlet pipe (8) extends along the radial direction of the premixing chamber (6), and the air flow direction of the air sprayed from the air inlet hole (9) into the premixing chamber (6) is the same as the axial direction of the premixing chamber (6).

4. A burner head for premixing gas and air according to claim 3, characterized in that: The air inlet hole (9) is provided on a side of the air inlet pipe (8) facing the air outlet (10).

5. A burner head for premixing gas and air according to claim 4, characterized in that: The air inlet pipes (8) are provided in a plurality; Along the axial direction of the premixing chamber (6), adjacent air intake pipes (8) are arranged in a staggered manner, and when adjacent air intake pipes (8) are projected onto a radial cross section of the premixing chamber (6), an angle exists between the adjacent air intake pipes (8).

6. A burner head for premixing gas and air according to claim 5, characterized in that: Along the radial direction of the premixing chamber (6), adjacent air inlet pipes (8) are arranged in parallel.

7. A burner head for premixing gas and air according to claim 1, characterized in that: The carrier further comprises an inner shell (2), the inner shell (2) being sleeved in the inner cavity of the outer shell (1), and a gap being provided between the inner wall of the outer shell (1) and the outer wall of the inner shell (2); the two ends of the inner shell (2) and the outer shell (1) are connected respectively via a first end plate (4) and a second end plate (5); The inner cavity of the inner shell (2) forms a premixing chamber (6); The outer wall of the inner shell (2), the inner wall of the outer shell (1), the first end plate (4) and the second end plate (5) enclose and form the airflow channel (3).

8. A burner head for premixing gas and air according to claim 7, characterized in that: At least one end of the air inlet pipe (8) passes through the side wall of the inner shell (2) and is connected to the air flow channel (3).

9. A burner head for premixing gas and air according to claim 7, characterized in that: Both ends of the air inlet pipe (8) pass through the side wall of the inner shell (2) and are connected to the air flow channel (3).

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