CN219063447U

CN219063447U - Fire hole combined unit structure and full premix burner

Info

Publication number: CN219063447U
Application number: CN202223144592.3U
Authority: CN
Inventors: 杜一鸣
Original assignee: Shanghai Hesen Electro Machinery Co ltd
Current assignee: Shanghai Hesen Electro Machinery Co ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-05-23
Anticipated expiration: 2032-11-25

Abstract

The utility model relates to a fire port combined unit structure and a full premix burner, wherein the fire port combined unit structure comprises a fire port body, and the fire port body comprises a frame wall; one or more main fire holes are formed in the fire hole body; the main fire hole is a conical hole; one or more flame stabilizing fire holes are formed in the frame wall of the fire hole body; the flame stabilizing fire hole is a rectangular strip hole; the area ratio of the single main fire hole to the single flame stabilizing fire hole is 1:0.3-1:0.4; the full premix burner comprises a plurality of fire port combined unit structures. Compared with the prior art, the full premix burner has the advantages that the flame separation does not occur when the full premix burner works under the condition that the air-to-fuel ratio is larger than 1.2, and the phenomenon that the surface of the burner is discolored due to overhigh metal temperature or the flame propagation speed is too fast to cause local tempering can be avoided, so that the stability of full premix combustion is improved, and the emission of nitrogen and oxygen compounds is reduced while stable combustion is ensured.

Description

Fire hole combined unit structure and full premix burner

Technical Field

The utility model relates to the technical field of full premix burners, in particular to a fire port combined unit structure and a full premix burner.

Background

The full premix burner is a high-efficiency burner which enters the global condition that energy conservation is important. The highest efficiency of the burner can reach more than 100% by using the gas appliance. But the global emission of flue gas is very important to reduce the atmospheric pollution while saving energy. The European and American regulations on the nitrogen oxides of the smoke emission focus are 58mg/kw.h, and the nitrogen oxides are uniformly not allowed to enter the market for any gas appliance and equipment higher than the emission standard. The requirements of limiting the discharge of the nitrogen oxide compounds of the commercial gas appliance are met from various provinces and cities in 2020, and the discharge of the nitrogen oxide compounds is generally required to be lower than 30-50mg/kw.h. The standard of the grade of the oxynitride is also specified in the standard of the domestic gas appliance. The grade 6 standard is 70mg/kw.h. In order to meet emission and energy efficiency standards, all manufacturers adopt full premix combustion technology and condensation technology. This is the most effective way to increase energy efficiency

But the emission requirements of the oxynitride must be considered while the energy efficiency is improved. The oxygen content of the general full premix combustion is controlled to be 3% -5%. The excess air ratio is 1-1.15. Thermal type oxynitride is formed due to the combustion temperature higher than 1400 ℃. If the excess air factor is increased to 1.4 or more. The oxynitride formation can be greatly reduced but the burner structure must provide stable combustion conditions, i.e. stable flame, and the flame does not leave the flame after increasing the air factor.

Therefore, a fire port structure capable of improving the stability of full premix combustion is needed to avoid flame separation during the operation of the full premix burner.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a flame port combined unit structure and a full premix burner, wherein the flame port combined unit structure in the scheme can prevent flame from being lifted when the full premix burner works under the condition that the air-to-fuel ratio is larger than 1.2, but the flame is lifted from the main flame hole surface by about 1.5-3, so that even if the flame temperature is reduced, the problem that the flame port metal temperature is too high, the surface color is changed or the flame propagation speed is too fast, and the local tempering caused by the heat conduction of the flame temperature to the flame port metal material can be avoided, thereby improving the stability of full premix combustion.

The aim of the utility model can be achieved by the following technical scheme:

the first object of the utility model is to provide a fire port combined unit structure, which comprises a fire port body, wherein the fire port body comprises a frame wall, and the frame wall is a circumferential side wall of the fire port body; one or more main fire holes are formed in the fire hole body; the main fire hole is a conical hole so as to ensure the outlet speed of the mixed air and fuel gas; one or more flame stabilizing fire holes are formed in the frame wall of the fire hole body; the flame stabilizing fire hole is a rectangular strip hole; the area ratio of the single main fire hole to the single flame stabilizing fire hole is 1:0.3-1:0.4.

further, the fire port body further comprises a main fire hole surface, a bottom plane and a reference plane; the bottom plane is 0.5-1mm lower than the main fire hole surface; the main fire hole penetrates through the fire hole body, and the top of the main fire hole is flush with the main fire hole surface of the fire hole body; the bottom of the flame stabilizing fire hole is flush with the bottom plane of the fire hole body, so that the root of the main fire hole is heated after the mixed air and fuel gas exits from the flame stabilizing fire hole, the combustion speed of the mixed air and fuel gas of the main fire hole is accelerated, and the combustion of the main fire hole is stabilized; the reference plane is connected with the frame wall; the bottom plane is lower than the main fire hole plane and the reference plane, thereby forming a groove.

Preferably, the flame stabilizing hole has a width of 0.1-0.3mm and a length of 1.2-2.0mm, and its specific size is adjusted according to the heat load and shape of the burner.

Preferably, the taper of the main fire hole is 1-1.5 degrees, the height (the distance from the bottom plane to the main fire hole surface) is 0.35-0.5mm, and the fire caliber is 0.5-0.8mm, so that the main fire hole has a speed greater than that of the mixed air-fuel gas of the flame stabilizing fire hole.

Preferably, the height of the flame stabilizing fire hole is less than 1/2 of the height of the main fire hole, so as to ensure the flame stabilizing effect of the flame stabilizing fire hole during combustion.

Preferably, the flame stabilizing fire hole and the main fire hole adopt a small hole technology to reduce combustion noise.

Further, the overlooking projection of the fire hole body is a round corner rectangle, and the size of the round corner rectangle can be adjusted according to the use requirement, and the fire hole body can be a round corner square or a round corner rectangle.

Further, the fire port combined unit structure is suitable for blue flame combustion.

Further, the flame of the flame stabilizing fire hole is flame stabilizing; the flame of the main fire hole is main flame.

Further, the flame stabilizing manner of the flame stabilizing flame and the main flame is cross flame stabilizing.

Further, the total area of all main fire holes and the total area of all stable flame holes are determined according to the power of the burner, and the larger the power is, the larger the total area is.

The second object of the present utility model is to provide a full premix burner, which comprises a plurality of fire hole combination unit structures.

Further, the full premix burner further comprises a burner cavity.

Further, the full premix burner comprising a plurality of fire hole combination unit structures is characterized in that the number of the fire hole combination unit structures is determined by the heat load of the burner, and the heat load of each fire hole combination unit structure is 5-8.2W/mm ² 。

Preferably, the full premix burner is a flat plate burner, a cylindrical burner or a circular well burner.

Further, the distance between adjacent fire port combination unit structures is not more than 8mm.

Preferably, the arrangement mode of the fire port combined unit structures is matrix arrangement, circular arrangement or quincuncial arrangement.

Compared with the prior art, the utility model has the following beneficial effects:

1) The flame port combined unit structure provided by the utility model can ensure that the full premix burner does not generate flame separation when working under the condition that the air-to-fuel ratio is more than 1.2, but the flame is separated from the main flame hole surface by about 1.5-3, so that even if the flame temperature is reduced, the phenomenon that the flame port metal temperature is too high due to the heat conduction of the flame port metal material, the surface is discolored or the flame propagation speed is too fast, and the local tempering is caused can be avoided, thereby improving the stability of full premix combustion.

2) The fire port combined unit structure and the full premix burner provided by the utility model can cover all full premix burners which can apply the combustion principle, the structural form, the fire port layout and the combination mode used by the fire port combined unit structure, and are wide in application and strong in practicability.

3) In the flame port combined unit structure and the full premix burner provided by the utility model, the flame stabilizing mode of the flame stabilizing and main flame is cross flame stabilizing, which is different from the traditional parallel flame stabilizing, and can obviously improve the flame stabilizing effect.

4) In the flame port combined unit structure and the full premix burner provided by the utility model, the flame stabilizing fire hole and the main fire hole adopt the small hole technology, so that the combustion noise can be obviously reduced.

5) In the flame port combined unit structure and the full premix burner provided by the utility model, the main flame hole is in a conical shape, so that the main flame hole has a certain flame hole depth, the static pressure of the mixed air and fuel gas before flowing out can be further uniform and stable, the combustion of the main flame hole is stable, and the phenomenon of flame shake is avoided.

Drawings

Fig. 1 is a schematic plan view showing the structure of a fire hole combination unit according to embodiment 1 of the present utility model.

Fig. 2 is a schematic plan view showing the structure of the fire hole combination unit according to embodiment 2 of the present utility model.

Fig. 3 is a schematic plan view showing the structure of the fire hole combination unit according to embodiment 3 of the present utility model.

Fig. 4 is a schematic plan view showing the structure of the fire hole combination unit according to embodiment 4 of the present utility model.

Fig. 5 is a schematic sectional view of the fire port combining unit structure of embodiment 1 in the present utility model.

Fig. 6 is a schematic top view of a full premix burner including a flame combining unit structure arranged in a matrix in example 1 of the present utility model.

Fig. 7 is a schematic top view of a full premix burner including a circular array of burner combination units according to example 1 of the present utility model.

Wherein:

1. main flame, 2, stable flame, 3, mixed air-fuel gas, 4, stable flame fire hole, 5, main fire hole, 6, main fire hole surface, 7, bottom plane; 8. reference plane, 9, burner cavity.

Detailed Description

The utility model will now be described in detail with reference to the drawings and specific examples. Features such as component model, material name, connection structure and the like which are not explicitly described in the technical scheme are all regarded as common technical features disclosed in the prior art. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The present utility model will be described in further detail with reference to specific examples.

Example 1

As shown in fig. 1, a fire port combined unit structure comprises a fire port body, wherein the fire port body comprises a frame wall; a plurality of main fire holes 5 are arranged on the fire hole body; the main fire hole 5 is a conical hole so as to ensure the outlet speed of the mixed air-fuel gas 3; a plurality of flame stabilizing holes 4 are arranged on the frame wall of the flame port body; the firework stabilizing holes 4 are rectangular strip holes; the areas of the flame stabilizing holes 4 and the main flame holes 5 are designed according to the requirement of stable combustion, and the area ratio of the single main flame holes 5 to the single flame stabilizing holes 4 is 1:0.3-1:0.4. the fire hole body also comprises a main fire hole surface 6, a bottom plane 7 and a reference plane 8; the bottom plane 7 is 0.5-1mm lower than the main fire hole surface 6; the main fire hole 5 penetrates through the fire hole body, and the top of the main fire hole 5 is flush with the main fire hole surface 6 of the fire hole body; the bottom of the flame stabilizing fire hole 4 is flush with the bottom plane 7 of the fire hole body, so that the mixed air and fuel gas 3 is discharged out of the flame stabilizing fire hole 4 and then the root of the main fire hole 5 is heated, the combustion speed of the mixed air and fuel gas 3 of the main fire hole 5 is accelerated, and the combustion of the main fire hole 5 is stabilized; the reference plane 8 is connected with the frame wall; the bottom plane 7 is lower than the main fire hole surface 6 and the reference plane 8, so that a groove is formed; the overlooking projection of the fire hole body is a round rectangle.

As shown in fig. 1, the top projection of the fire hole body is a rounded square, and three main fire holes 5 are arranged in a triangular arrangement; four firework stabilizing holes 4 are formed and are respectively distributed on each of the four frame walls.

As shown in fig. 6 and 7, a full premix burner includes the fire port combination unit structure of this embodiment.

Wherein, fig. 6 and 7 are respectively full premix burners comprising fire port combination unit structures in different arrangement forms.

As shown in fig. 6, a schematic top view of a full premix burner according to the first embodiment of the present utility model, which includes a fire port combination unit structure arranged in a matrix, is shown, and the distance between adjacent fire port combination unit structures is equal to or not greater than 8mm.

As shown in fig. 7, which is a schematic top view of a full premix burner including a burner assembly unit structure of a first embodiment of circular arrangement, the distance between adjacent burner assembly unit structures is not more than 8mm.

As shown in fig. 1, 5 and 6, the burner assembly unit structure of the present embodiment and the full premix burner including the burner assembly unit structure arranged in a matrix will be described in detail: the width of the flame stabilizing hole 4 is 0.1mm, and the length is 2.0mm; the taper of the main fire hole 5 is 1 degree, the height (the distance from the bottom plane 7 to the main fire hole surface 6) is 0.5mm, and the fire caliber of the main fire hole 5 is 0.8mm; the bottom plane 7 is 0.5mm lower than the main fire hole surface 6; the full premix burner is a flat burner and further comprises a burner cavity 9; the fire port combined unit structures in the full premix burner are arranged in a 10 multiplied by 10 matrix shape, and the distance between adjacent fire port combined unit structures is 8mm; the height of the flame stabilizing hole 4 is 0.2mm. The working method and principle of the full premix burner are as follows:

1) The fuel gas enters a fan through a venturi tube to be mixed to obtain mixed air gas 3, and the mixed air gas 3 enters a burner cavity 9;

2) The mixed air-fuel gas 3 flows out through the main flame hole 5 and the flame stabilizing flame hole 4) respectively at a certain speed under a certain air pressure to generate main flame 1 and flame stabilizing flame 2 respectively;

3) The flow speed of the flame stabilizing flame 2 is lower than that of the main flame 1, and the flow speed of the air-mixed air-fuel gas 3 flowing out of the outlet of the main flame hole 5 is 2-3 times higher than that of the air-mixed gas 3 flowing out of the outlet of the flame stabilizing flame hole 4;

4) After the flame stabilizing flame 2 flows out of the flame stabilizing flame hole 4, part of the flame stabilizing flame 2 heats the root of the nearest main flame hole 5, and the other part of the flame rises along the main flame hole 5 to continue heating the main flame 1; the other part of the flame holding flame 2 continues to spread and heats other main fire holes 5 except the nearest main fire hole 5; the four flame stabilizing flames 2 are converged in the flame port combined unit structure, and a stable temperature heating layer is formed in a groove of the flame port combined unit structure to heat the root of the main flame 1;

5) Along with the heating of the flame stabilizing flames 2, the main flames 1 extend and spread, the combustion point of the main flames 1 is advanced, the main flames 1 are ignited and burnt at the position 1.5-3mm away from the main fire holes 5, and the root of each main flame 1 is provided with a stable temperature heating layer, so that the flame height is consistent when each main flame 1 burns;

6) The main flames 1 in each flame port combined unit structure are consistent in height, so that the whole flame group consisting of a plurality of flame port combined unit structures of the whole full premix burner is formed, the main flames 1 in the flame group are consistent in height and temperature, and the combustion temperature and the oxynitride generation condition are convenient to control.

The full premix burner has the advantages that as the main flame 1 is burnt 1.5-3mm after leaving the main flame hole 5, the main flame hole 5 is cooled by the mixed air-fuel gas 3, the temperature of the surface of the burner can be reduced, and the running reliability of the burner is ensured; because the flame stabilizing mode of the flame stabilizing 2 and the main flame 1 is cross flame stabilizing, the flame stabilizing effect is obviously improved unlike the traditional parallel flame stabilizing; because the flame stabilizing holes 4 and the main flame holes 5 adopt the small hole technology, the combustion noise is obviously reduced; because the main fire hole 5 of the main flame 1 is a conical hole, the main fire hole 5 has a certain fire hole depth, the static pressure of the mixed air and fuel gas 3 is further and uniformly stabilized before flowing out, the combustion of the main flame 1 is stabilized, and the phenomenon of flame shake is avoided.

Example 2

As shown in fig. 2, a fire hole combined unit structure, wherein a top view projection of a fire hole body is a round square, and four main fire holes 5 are arranged in a matrix arrangement manner; four firework stabilizing holes 4 are formed and are respectively distributed on each of the four frame walls.

Example 3

As shown in fig. 3, a fire hole combined unit structure, wherein a top view projection of a fire hole body is a rounded rectangle, nine main fire holes 5 are arranged, each group is formed in a group of three, and each group is arranged in a triangular mode; eight firework stabilizing holes 4 are formed and are respectively distributed on each of the four frame walls.

Example 4

As shown in fig. 4, a fire hole combined unit structure, wherein a top view projection of a fire hole body is in a shape of a round rectangle, twelve main fire holes 5 are arranged, each group is arranged in a matrix mode; eight firework stabilizing holes 4 are formed and are respectively distributed on each of the four frame walls.

The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present utility model. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present utility model is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present utility model.

Claims

1. The fire port combined unit structure is characterized by comprising a fire port body, wherein the fire port body comprises a frame wall;

one or more main fire holes (5) are arranged on the fire hole body;

the main fire hole (5) is a conical hole;

one or more flame stabilizing fire holes (4) are formed in the frame wall of the fire hole body;

the flame stabilizing fire hole (4) is a rectangular strip hole;

the area ratio of the single main fire hole (5) to the single flame stabilizing fire hole (4) is 1:0.3-1:0.4.

2. a fire port combination unit structure according to claim 1, characterized in that the fire port body further comprises a main fire hole face (6), a bottom plane (7) and a reference plane (8);

the bottom plane (7) is 0.5-1mm lower than the main fire hole surface (6);

the main fire hole (5) penetrates through the fire hole body, and the top of the main fire hole (5) is flush with a main fire hole surface (6) of the fire hole body;

the bottom of the flame stabilizing fire hole (4) is flush with the bottom plane (7) of the fire hole body;

-said reference plane (8) is engaged with said rim wall;

the bottom plane (7) is lower than the main fire hole plane (6) and the reference plane (8) so as to form a groove.

3. A fire hole combined unit structure according to claim 1, characterized in that the flame stabilizing fire hole (4) has a width of 0.1-0.3mm and a length of 1.2-2.0mm.

4. A fire hole combined unit structure according to claim 1, characterized in that the taper of the main fire hole (5) is 1-1.5 °, the height is 0.5-1mm, and the fire caliber is 0.5-0.8mm.

5. A fire port combination unit structure according to claim 4, characterized in that the height of the flame stabilizing fire hole (4) is less than 1/2 of the height of the main fire hole (5).

6. The burner assembly unit structure of claim 1, wherein the top view of the burner body is rounded rectangular.

7. A full premix burner comprising a plurality of fire port combination unit structures as defined in any one of claims 1-6.

8. The full premix burner of claim 7, wherein the full premix burner is a flat plate burner, a cylindrical burner, or a circular well burner.

9. The full premix burner of claim 7 wherein the distance between adjacent burner combination unit structures is no greater than 8mm.

10. The full premix burner of claim 7, wherein the plurality of burner assembly cell structures are arranged in a matrix, circular or quincuncial arrangement.