CN221611381U - Fire grate and combustion device - Google Patents

Abstract

The utility model discloses a fire grate and combustion equipment, the fire grate comprises: the fire grate comprises a fire grate body, a fire grate and a fire grate, wherein an airflow channel is formed in the fire grate body, the fire grate body is provided with a top plate, and a plurality of combustion fire holes communicated with the airflow channel are formed in the top plate; the metal net is arranged on one side of the top plate and corresponds to the plurality of combustion fire holes; and the flow-dividing flame-stabilizing piece is arranged in the airflow channel and is provided with a plurality of flow-dividing holes communicated with a plurality of combustion fire holes. According to the technical scheme, the heat intensity of the combustion fire hole can be reduced, the combustion uniformity and the combustion stability are improved, the emission of nitrogen oxides is reduced, and the low-nitrogen emission performance requirement is met.

Description

Fire grate and combustion device

Technical Field

The utility model relates to the technical field of combustion equipment, in particular to a fire grate and combustion equipment.

Background

The burner is a core component of the gas plant. In the burner of the gas water heater in the related art, in the low nitrogen oxide combustion, a full premix combustion technology, a thick and thin combustion technology and a water cooling combustion technology are adopted. The fire hole of the fire row of the traditional burner usually adopts a single fire hole structure, and the single fire hole structure has the advantages of small fire hole area, high fire hole strength of combustion, poor smoke performance of instant combustion, higher nitrogen oxide and incapability of meeting the low-nitrogen emission performance requirement.

Disclosure of utility model

The utility model mainly aims to provide a fire grate, which aims to reduce the heat intensity of combustion fire holes, improve the combustion uniformity and combustion stability, reduce the emission of nitrogen oxides and meet the requirement of low-nitrogen emission performance.

In order to achieve the above object, the present utility model provides a fire grate, comprising:

The fire grate comprises a fire grate body, a fire grate and a fire grate, wherein an airflow channel is formed in the fire grate body, the fire grate body is provided with a top plate, and a plurality of combustion fire holes communicated with the airflow channel are formed in the top plate;

the metal net is arranged on one side of the top plate and corresponds to the plurality of combustion fire holes; and

The flow-dividing flame-stabilizing piece is arranged in the airflow channel and is provided with a plurality of flow-dividing holes communicated with a plurality of combustion fire holes.

In one embodiment, the number of layers of the metal mesh is multiple;

And/or a plurality of the combustion fire holes are distributed at intervals along the length direction of the top plate to form a plurality of groups of fire hole groups, wherein the plurality of groups of fire hole groups comprise a middle fire hole group positioned in the middle area of the top plate and two end fire hole groups respectively positioned in the two end areas of the top plate; the metal net comprises a middle net piece which is arranged corresponding to the middle fire hole group and two end net pieces which are arranged corresponding to the two end fire hole groups respectively, and the number of layers of the end net pieces is larger than that of the middle net pieces.

In one embodiment, a plurality of the combustion fire holes are arranged at intervals along the length direction of the top plate to form a plurality of fire hole groups, and each fire hole group comprises a first combustion fire hole and a second combustion fire hole; wherein,

The opening area of the first combustion fire hole is different from the opening area of the second combustion fire hole;

and/or the fire hole centers of the first combustion fire holes and the fire hole centers of the second combustion fire holes are arranged in a staggered manner in the width direction of the top plate;

And/or, at least part of the hole edges of the combustion fire holes are provided with convex teeth.

In one embodiment, ribs for separating any two adjacent flow distribution holes are arranged on the top of the flow distribution flame stabilizing piece, and the projection of the ribs towards the top plate is at least partially positioned in the area surrounded by the combustion fire holes.

In one embodiment, the fire grate body is provided with a first side and a second side which are oppositely arranged along the length direction, the airflow channel comprises an air inlet arranged on one side, an injection section which is arranged from the air inlet towards the second side in an extending manner, a bending section which is upwards bent from one end of the injection section away from the air inlet, and a diversion section which is arranged from one end of the bending section away from the injection section towards the first side in an extending manner, the diversion section is communicated with a plurality of combustion fire holes, and a speed reducing structure is arranged in the airflow channel corresponding to the corner part of the bending section, which is connected with the diversion section.

In one embodiment, the split-flow flame stabilizing member comprises a first split-flow flame stabilizing plate provided with a plurality of split-flow holes, the first split-flow flame stabilizing plate is positioned below the top plate, and a concave cavity is formed in one side of the first split-flow flame stabilizing plate, which faces the top plate;

The metal net is positioned between the top plate and the first split flame stabilizing plate; or the metal net is positioned on one side of the top plate, which is away from the first diversion flame stabilizing plate.

In one embodiment, the metal mesh is located between the top plate and the first split-flow flame stabilizing plate, the side edge of the first split-flow flame stabilizing plate is abutted against the metal mesh, and the middle area of the first split-flow flame stabilizing plate is recessed towards one side away from the metal mesh to form the concave cavity.

In one embodiment, the fire grate body further comprises two side plates respectively arranged at two sides of the width direction of the top plate, the two side plates are respectively arranged in a downward extending manner relative to the top plate, the air flow channel is formed between the two side plates, the split flame stabilizing piece further comprises two second split flame stabilizing plates respectively arranged at two sides of the width direction of the first split flame stabilizing plate, and the two second split flame stabilizing plates are respectively arranged at the inner sides of the two side plates in a one-to-one correspondence manner;

Each side plate is provided with a side air outlet hole, a side flow distribution channel communicated with the air flow channel is formed between each second flow distribution flame stabilizing plate and the corresponding side plate, and the side flow distribution channel is communicated with the corresponding side air outlet hole on the side plate.

In one embodiment, a bottom shunt port is formed between the lower side edge of the second shunt flame stabilizing plate and the corresponding side plate, and the airflow channel is communicated with the side shunt channel through the bottom shunt port;

And/or the second flow-dividing flame stabilizing plate is provided with a side flow dividing opening, and the air flow channel is communicated with the side flow dividing channel through the side flow dividing opening.

In one embodiment, the second flow-dividing flame stabilizing plate comprises an abutting part abutting against the corresponding side plate and a concave part which is concave towards one side away from the side plate relative to the abutting part, the side flow-dividing channel is formed between the concave part and the corresponding side plate, the concave part is provided with a side flow dividing opening, and the air flow channel is communicated with the side flow dividing channel through the side flow dividing opening.

In one embodiment, the fire grate further comprises a flame stabilizing device sleeved at the top of the fire grate body, the flame stabilizing device is provided with a cavity with an open top, a side air outlet channel is formed between the side wall of the cavity and each side plate, the side air outlet channel is communicated with the side air outlet holes on the corresponding side plate, and the top of the side air outlet channel is opened to form a flame stabilizing port.

The utility model also proposes a combustion apparatus characterized by comprising a fire grate as described above.

According to the technical scheme, the fire grate body is provided with a metal net and a diversion flame stabilizing piece, an airflow channel is formed in the fire grate body, and a plurality of combustion fire holes communicated with the airflow channel are formed in the top of the fire grate body; the metal net is arranged on the fire grate body and corresponds to the plurality of combustion fire holes; the flow-dividing flame-stabilizing piece is arranged in the airflow channel and is provided with a plurality of flow-dividing holes communicated with a plurality of combustion fire holes. After the air flow in the air flow channel is split through the plurality of split holes of the split flame stabilizing piece, the air flow flows to the metal net and the plurality of combustion fire holes at the top of the fire grate body, so that the air flow speed is reduced, the air flow distribution is more uniform, and the combustion uniformity is improved. And the combustion fire holes with larger open areas at the top of the fire grate body can be dispersed into a plurality of tiny fire holes through the tiny meshes of the metal net. On one hand, compared with the strip fire holes of the traditional fire row, the burner area of the fire row can be increased; on the other hand, the fire holes can be dispersed, the problem of local high temperature of the strip-shaped fire holes is avoided, the temperature of a fire row combustion surface is more uniform, the heat intensity of the fire holes is reduced, the flame height is reduced, the local high temperature is avoided, and the generation of nitrogen oxides (NOx) can be effectively inhibited, so that the low-nitrogen combustion is realized. In addition, the metal net can also play a role in preventing tempering. Therefore, the fire grate can reduce the heat intensity of the combustion fire holes, improve the combustion uniformity and the combustion stability, reduce the emission of nitrogen oxides and meet the requirement of low-nitrogen emission performance.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a fire grate according to an embodiment of the present utility model;

FIG. 2 is a top view of the fire row of FIG. 1;

FIG. 3 is a side view of the fire row of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the fire grate of FIG. 1;

FIG. 5 is a schematic partial cross-sectional view of an assembly structure of a fire grate body, a metal mesh and a split flame stabilizing member according to an embodiment of the present utility model;

FIG. 6 is a top view of the assembly structure of the flame holder, the metal mesh and the split-flow flame stabilizing members of FIG. 5;

FIG. 7 is a schematic cross-sectional view of the assembly structure of the flame holder, the metal mesh and the split-flow flame stabilizing member shown in FIG. 5;

FIG. 8 is a schematic view of a metal mesh according to an embodiment of the present utility model;

FIG. 9 is a schematic view of a split-flow flame holder according to an embodiment of the present utility model;

FIG. 10 is a top view of the split flame holder of FIG. 9;

FIG. 11 is a schematic cross-sectional view of the flame stabilizing member of FIG. 9;

FIG. 12 is a schematic view of a plurality of fire rows arranged side by side in accordance with an embodiment of the present utility model.

Reference numerals illustrate:

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The present utility model proposes a fire grate 100.

Referring to fig. 1 to 5, in an embodiment of the present utility model, the flame holder 100 includes a flame holder body 10, a metal mesh 20, and a flame-splitting and stabilizing member 30. An air flow channel 101 is formed in the fire grate body 10, the fire grate body 10 is provided with a top plate 11, and the top plate 11 is provided with a plurality of combustion fire holes 111 communicated with the air flow channel 101; the metal mesh 20 is provided at one side of the top plate 11 and is provided corresponding to the plurality of combustion fire holes 111; the split flame stabilizing member 30 is disposed in the air flow channel 101, and the split flame stabilizing member 30 is provided with a plurality of split holes 311 communicating with the plurality of combustion flame holes 111.

The fire grate 100 is mainly used on a burner, the fire grate body 10 is a main body structure of the fire grate 100, an air inlet 1011 of an air flow channel 101 in the fire grate body 10 is connected with an air flow source, the air flow source comprises air and fuel gas, the fuel gas and the air enter the air flow channel 101 from the air inlet 1011, the fuel gas and the air are premixed in the air flow channel 101, and then flow out from a combustion fire hole 111 at the top of the fire grate body 10 and are ignited to form combustion flames. The metal mesh 20 is arranged on one side of the top plate 11 of the fire grate body 10, the flow channel 101 is internally provided with a flow-dividing flame-stabilizing piece 30, and the flow-dividing flame-stabilizing piece 30 is provided with a plurality of flow-dividing holes 311 communicated with the plurality of combustion fire holes 111. The number of layers of the metal mesh 20 may be single-layered or multi-layered as required. The metal mesh 20 may be disposed on the inner side of the top plate 11 (i.e., the side near the split flame holder 30), or the metal mesh 20 may be disposed on the outer side of the top plate 11 (i.e., the side away from the split flame holder 30). When the metal mesh 20 is disposed on the outer side of the top plate 11, the combustion flame is mainly concentrated on the metal mesh 20 for combustion, and the metal mesh 20 is easy to reddish, so that the metal mesh 20 has high requirements on heat resistance and strength, and the metal mesh 20 can be disposed on the inner side of the top plate 11 in consideration of cost and other factors. The metal mesh 20 or the shunt flame stabilizing member 30 is connected and fixed with the fire grate body 10 by welding, riveting or the like. When the metal mesh 20 is positioned between the shunt flame stabilizing member 30 and the fire grate body 10, the metal mesh 20 and the shunt flame stabilizing member 30 can be connected and fixed.

According to the technical scheme, a fire grate body 10 is provided with a metal net 20 and a diversion flame stabilizing piece 30, an airflow channel 101 is formed in the fire grate body 10, and a plurality of combustion fire holes 111 communicated with the airflow channel 101 are formed in the top of the fire grate body 10; the metal mesh 20 is arranged on the fire grate body 10 and corresponds to the plurality of combustion fire holes 111; the split flame stabilizing member 30 is disposed in the airflow passage 101, and the split flame stabilizing member 30 is provided with a plurality of split holes 311 communicating with the plurality of combustion flame holes 111. The air flow in the air flow channel 101 is split through the plurality of split holes 311 of the split flame stabilizing piece 30, and then flows to the metal mesh 20 and the plurality of combustion fire holes 111 at the top of the fire grate body 10, so that the air flow speed is reduced, the air flow distribution is more uniform, and the combustion uniformity is improved. And the combustion fire holes 111 having a large open area at the top of the fire grate body 10 can be dispersed into a plurality of fine fire holes by the fine mesh holes of the metal net 20. On the one hand, the burner area of the fire row 100 can be increased as compared to the strip fire holes of the conventional fire row; on the other hand, the fire holes can be dispersed, the problem of local high temperature of the strip fire holes is avoided, the temperature of the combustion surface of the fire row 100 is more uniform, the heat intensity of the fire holes is reduced, the flame height is reduced, the local high temperature is avoided, and the generation of nitrogen oxides (NOx) can be effectively inhibited, so that the low-nitrogen combustion is realized. In addition, the metal mesh 20 can also function to prevent backfire. Thus, the fire grate 100 can reduce the thermal strength of the combustion fire holes 111, improve the combustion uniformity and combustion stability, reduce the emission of nitrogen oxides, and meet the requirement of low-nitrogen emission performance.

In one embodiment, as shown in fig. 7, the metal mesh 20 has a plurality of layers. The metal net 20 is arranged in multiple layers, so that the air flow at the fire hole 111 can be better dispersed, the better speed-reducing flame-stabilizing effect is achieved, local high temperature caused by local air flow aggregation is avoided, the temperature of the combustion surface of the fire grate 100 is more uniform, the heat intensity of the fire hole is reduced, and the generation of nitrogen oxides (NOx) is effectively inhibited, so that low-nitrogen combustion is realized. Alternatively, the number of layers of the metal mesh 20 is 2 to 5. For example, the number of layers of the metal mesh 20 may be 2, 3, 4, 5. Optionally, the mesh number of the metal mesh 20 is 20 to 50 mesh. For example, the mesh number of the metal mesh 20 may be 20 mesh, 30 mesh, 40 mesh, 50 mesh.

Referring to fig. 6 and 8, in an embodiment, a plurality of the combustion fire holes 111 are arranged at intervals along the length direction of the top plate 11 to form a plurality of groups of fire hole groups, wherein the plurality of groups of fire hole groups include a middle fire hole group 111a located in a middle region of the top plate 11, and two end fire hole groups 111b located in two end regions of the top plate 11 respectively (as shown in a dashed box in fig. 6); the metal mesh 20 includes a middle mesh sheet 21 corresponding to the middle fire hole group 111a, and two end mesh sheets 22 corresponding to the two end fire hole groups 111b, where the number of layers of the end mesh sheets 22 is greater than that of the middle mesh sheet 21.

In the present embodiment, the plurality of combustion fire holes 111 are arranged at intervals along the length direction of the top plate 11 to form a plurality of fire hole groups, so that the top surface of the fire row body 10 can be divided into a plurality of combustion units along the length direction, and the combustion is more uniform. In addition, considering that the airflow velocity of the end fire hole group 111b is faster than that of the middle fire hole group 111a in the length direction of the top plate 11, the number of layers of the end net piece 22 is larger than that of the middle net piece 21, so that the number of layers of the end net piece 22 corresponding to the end fire hole group 111b is relatively larger, and larger resistance can be generated on the airflow, so that the airflow flowing out of the end fire hole group 111b is slowed down, the airflows of the fire hole groups in all areas in the length direction of the top plate 11 are kept substantially consistent, the uniform distribution of fuel gas is facilitated, the combustion uniformity and the combustion stability are further improved, and the emission of nitrogen oxides is reduced. Illustratively, the two end mesh sheets 22 are 4-layer mesh and the middle mesh sheet 21 is 3-layer mesh. It should be noted that, in practical application, the end mesh 22 and the middle mesh 21 may be integrally formed by bending a strip-shaped metal mesh 20, which may simplify the manufacturing process and reduce the cost. Of course, the end mesh sheet 22 and the middle mesh sheet 21 may be respectively adhered to the corresponding areas of the top plate 11 by using two independent metal mesh sheets 20.

Referring to fig. 6, in an embodiment, a plurality of the combustion fire holes 111 are arranged at intervals along the length direction of the top plate 11 to form a plurality of fire hole groups, each of the fire hole groups includes a first combustion fire hole 1111 and a second combustion fire hole 1112; the opening area of the first combustion fire hole 1111 is different from the opening area of the second combustion fire hole 1112.

In the present embodiment, the plurality of combustion fire holes 111 are arranged at intervals along the length direction of the top plate 11 to form a plurality of fire hole groups, so that the top surface of the fire row body 10 can be divided into a plurality of combustion units along the length direction, and the combustion is more uniform. And every group fire hole group includes first burning fire hole 1111 and second burning fire hole 1112, and the area of opening of first burning fire hole 1111 is different with the area of opening of second burning fire hole 1112 for can form big or small flame and match each other when every combustion unit burns, because the flame size is different, the boundary condition of wind speed is also different when taking off the flame, when a certain flame has the trend from the flame, the flame on every side can pull, forms stable flame, makes the accommodation of flame row 100 to fan wind speed wider.

It should be noted that the specific shape of the first combustion fire hole 1111 and the second combustion fire hole 1112 is not limited, and may be, for example, a bar shape, a square shape, a round shape, a trapezoid shape, or other regular or irregular shape. Illustratively, the first combustion fire hole 1111 is a strip-shaped hole extending in the width direction of the top plate 11, and the second combustion fire hole 1112 includes two sub-combustion fire holes arranged at intervals in the width direction of the top plate 11. The fire hole arrangement rules of the end fire hole group 111b and the middle fire hole group 111a can be the same or different. Illustratively, the first combustion fire holes 1111 and the second combustion fire holes 1112 in the end fire hole group 111b are alternately arranged at intervals. The first combustion fire hole 1111 in the middle fire hole group 111a is located between the two second combustion fire holes 1112. Illustratively, the open area of the first combustion fire holes 1111 in the end fire hole group 111b is larger than the open area of the second combustion fire holes 1112. Illustratively, the open area of the first combustion fire holes 1111 in the middle fire hole group 111a is smaller than the open area of the second combustion fire holes 1112.

As shown in fig. 6, in an embodiment, a plurality of the combustion fire holes 111 are arranged at intervals along the length direction of the top plate 11 to form a plurality of fire hole groups, each of the fire hole groups including a first combustion fire hole 1111 and a second combustion fire hole 1112; the flame hole centers of the first combustion flame holes 1111 and the flame hole centers of the second combustion flame holes 1112 are arranged in a staggered manner in the width direction of the top plate 11.

In the present embodiment, by arranging the fire hole centers of the first combustion fire holes 1111 and the fire hole centers of the second combustion fire holes 1112 in a staggered manner in the width direction of the top plate 11, a plurality of combustion fire holes 111 arranged at staggered intervals, one by one, are formed at the top of the fire row body 10. So set up, can cut apart the flame into the flame of a big one little to big or small flame dislocation separates, when a certain flame has the trend from the flame, and the flame on every side can pull, can form better steady flame effect, is favorable to further widening the accommodation of flame row 100 to the fan wind speed.

Note that, when the combustion fire hole 111 (for example, the first combustion fire hole 1111) has a single hole structure, only one fire hole center of the combustion fire hole 111; when the combustion fire hole 111 (for example, the second combustion fire hole 1112) is of a porous structure formed by combining a plurality of sub-combustion fire holes, each sub-combustion sub-fire hole of the combustion fire hole 111 has one fire hole center, and the combustion fire hole 111 of the porous structure has a plurality of fire hole centers. For example, in the present embodiment, the first combustion fire hole 1111 is a strip-shaped hole extending in the width direction of the top plate 11, and the fire hole center of the first combustion fire hole 1111 is substantially located on the width center line of the top plate 11; the second combustion fire hole 1112 includes two sub-combustion fire holes arranged at intervals along the width direction of the top plate 11, and the fire hole centers of the two sub-combustion fire holes are located on both sides of the width center line of the top plate 11, respectively. So that the flame hole centers of the first combustion flame holes 1111 and the two flame hole centers of the second combustion flame holes 1112 are formed in a staggered arrangement in the width direction of the top plate 11.

In one embodiment, as shown in fig. 6, at least a portion of the hole edges of the combustion fire holes 111 are provided with teeth 112. For example, the hole edges of the first combustion fire hole 1111 and/or the second combustion fire hole 1112 are provided with at least one tooth 112. By providing the protruding teeth 112 at the hole edge of the combustion fire hole 111, on one hand, the contact surface between the flame and the surrounding air can be improved, so that the combustion is more sufficient; on the other hand, the inner edge contour of the combustion fire hole 111 can be prolonged, so that the perimeter of the contact contour between the flame and the periphery of the fire hole is increased, and the flame is more stable; on the other hand, the convex teeth 112 can also play a role of dispersing airflow, and avoiding local high temperature caused by flame gathering combustion.

Alternatively, in an embodiment, a plurality of the combustion fire holes 111 are arranged at intervals along the length direction of the top plate 11 to form a plurality of fire hole groups, each of the fire hole groups including a first combustion fire hole 1111 and a second combustion fire hole 1112; the opening area of the first combustion fire hole 1111 is different from the opening area of the second combustion fire hole 1112; the fire hole centers of the first combustion fire holes 1111 and the fire hole centers of the second combustion fire holes 1112 are arranged in a staggered manner in the width direction of the top plate 11; at least part of the hole edges of the combustion fire holes 111 are provided with teeth 112. So, through being equipped with the staggered and many departments of fire hole and adding tooth structure at the top of fire row body 10 to cooperation metal mesh 20 and reposition of redundant personnel steady flame spare 30, can solve flame uniformity stability, flame height and make the lower problem of flue gas emission well, make the burning emission flue gas performance in the twinkling of an eye better, and can reduce nitrogen oxide's production, make emission stable uniformity improve.

Referring to fig. 6 and 10, in one embodiment, ribs 312 for separating any two adjacent split holes 311 are provided on the top of the split flame stabilizing member 30, and the projection of the ribs 312 toward the top plate 11 is at least partially located in the area surrounded by the combustion flame holes 111.

In this embodiment, the top of the flame stabilizing member 30 is provided with a plurality of ribs 312, and the ribs 312 may include transverse ribs and longitudinal ribs that are staggered. Any two adjacent separation holes are separated by a rib 312. The projection of the ribs 312 towards the top plate 11 is at least partially located in the area surrounded by the combustion fire holes 111, that is, the positions of the ribs 312 at the top of the diversion flame stabilizing piece 30 correspond to the positions of the combustion fire holes 111 at the top of the fire grate body 10, so that the air flow in the air flow channel 101 can be blocked by the ribs 312 and then flows from the diversion holes 311 at the two sides to the combustion fire holes 111 after being slowed down, thereby being beneficial to further dispersing the air flow and playing a better speed-down flame stabilizing effect.

As shown in fig. 1, in one embodiment, the fire grate body 10 has a first side and a second side opposite to each other along a length direction, the air flow channel 101 includes an air inlet 1011 provided at the one side, an injection section 1012 extending from the air inlet 1011 toward the second side, a bending section 1013 bent upward from an end of the injection section 1012 away from the air inlet 1011, and a diversion section 1014 extending from an end of the bending section 1013 away from the injection section 1012 toward the first side, the diversion section 1014 is communicated with the plurality of combustion fire holes 111, and a speed reducing structure is provided in the air flow channel 101 corresponding to a corner portion of the bending section 1013 connected to the diversion section 1014.

In this embodiment, the airflow passage 101 includes an air inlet 1011, an injection section 1012, a bending section 1013, and a diversion section 1014 that are sequentially communicated. The air stream source (gas and air) enters the injection section 1012 through the air inlet 1011 and is then conveyed through the bend section 1013 to the diversion section 1014 and from the diversion section 1014 to the combustion fire hole 111. Generally, the airflow speed at the corner portion where the curved section 1013 is connected with the diversion section 1014 is faster, which easily results in uneven distribution of combustion gas, and the airflow resistance at the corner portion can be increased by using the speed reducing structure by arranging the speed reducing structure at the corner portion where the curved section 1013 is connected with the diversion section 1014 in the airflow channel 101, so that the airflow speed at the corner portion is reduced, and the combustion gas flowing out from the diversion section 1014 is uniformly distributed, thereby ensuring that the combustion at each portion of the fire grate body 10 is more uniform and sufficient, being beneficial to realizing low-nitrogen combustion, and having stable and high smoke emission performance.

There are various specific ways to form the speed reducing structure in the air flow channel 101, for example, the speed reducing structure may be integrally formed on the fire grate body 10; or the speed reducing structure can be connected and fixed with the fire grate body 10 by adopting a separate component. As long as the speed reducing structure is ensured to have a speed reducing effect on the air flow at the corner of the air flow channel 101.

To simplify the manufacturing process and reduce the cost, in one embodiment, as shown in fig. 1, the speed reducing structure includes a speed reducing convex hull 122 provided on a side wall of the fire grate body 10, and the speed reducing convex hull 122 protrudes toward the inside of the airflow channel 101. In actual production, the deceleration convex hulls 122 can be pressed inwards at the corner positions of the outer side walls of the fire grate body 10 corresponding to the airflow channels 101, so that the process is simple and the manufacturing is convenient. The number of the deceleration convex hulls 122 can be set to be single or multiple according to actual needs. Optionally, the two opposite sides of the fire grate body 10 in the width direction are respectively provided with the deceleration convex hulls 122, so that a better deceleration effect can be achieved, and the distribution of the combustion gas is more uniform.

On the basis of the above embodiment, referring to fig. 6, 7 and 10, in one embodiment, the split-flow flame stabilizing member 30 includes a first split-flow flame stabilizing plate 31 provided with a plurality of split-flow holes 311, the first split-flow flame stabilizing plate 31 is located below the top plate 11, and a cavity 313 is provided on a side of the first split-flow flame stabilizing plate 31 facing the top plate 11; the metal mesh 20 is positioned between the top plate 11 and the first split flame stabilizing plate 31; or the metal mesh 20 is positioned on the side of the top plate 11 facing away from the first split flame holding plate 31.

In the present embodiment, the top plate 11, the first split flame holding plate 31, and the metal mesh 20 are stacked. The metal mesh 20 may be selectively disposed between the top plate 11 and the first flow-dividing flame stabilizing plate 31, so that the air flow in the air flow channel 101 is divided by the flow-dividing holes 311 of the first flow-dividing flame stabilizing plate 31, and then flows to the combustion fire holes 111 on the top plate 11 for combustion after being broken up by the mesh openings of the metal mesh 20. Or the metal mesh 20 may be disposed on a side of the top plate 11 away from the first split flame stabilizing plate 31, at this time, the air flow in the air flow channel 101 is split through the split holes 311 of the first split flame stabilizing plate 31, then flows to the combustion fire holes 111 on the top plate 11, and finally burns at the metal mesh 20. And the side of the first split flame stabilizing plate 31 facing the top plate 11 is provided with a concave cavity 313, and the concave cavity 313 can allow air to flow through, thereby being beneficial to increasing ventilation and ensuring smooth air flow. Through the cooperation of roof 11, metal mesh 20 and first reposition of redundant personnel steady flame board 31, can play fine slow down steady flame effect, make the flame even stable, can make the heat load improve, reduce the flame height, can make the adaptability scope of combustor improve, make the burning in the twinkling of an eye discharge flue gas performance better, can make the nitrogen oxide that produces after the burning lower.

As shown in fig. 7, in an embodiment, the metal mesh 20 is located between the top plate 11 and the first split-flow flame-stabilizing plate 31, where a side edge of the first split-flow flame-stabilizing plate 31 abuts against the metal mesh 20, and a middle area of the first split-flow flame-stabilizing plate 31 is recessed toward a side facing away from the metal mesh 20 to form the concave cavity 313.

In this embodiment, the metal mesh 20 is located between the top plate 11 and the first split flame stabilizing plate 31, so that the temperature at the metal mesh 20 is not too high, which is beneficial to prolonging the service life of the metal mesh 20, and meanwhile, the requirements on the heat resistance and strength of the metal mesh 20 can be relatively reduced, and the cost is reduced. And the side edges of the first split flame stabilizing plates 31 are abutted against the metal mesh 20, so that the metal mesh 20 can be clamped between the top plate 11 and the side edges of the first split flame stabilizing plates 31, and the metal mesh 20 is more stable and reliable to install. In addition, the lateral edge of the first shunt flame stabilizing plate 31 is propped against the metal net 20, so that the lateral edge of the metal net 20 can be prevented from buckling deformation, the flatness of the metal net 20 is guaranteed, and the uniform combustion stability is further improved. The middle region of the first split flame holding plate 31 may be recessed toward a side facing away from the metal mesh 20 by a profiling process to form a recess 313, which may simplify the manufacturing process. The cross-sectional shape of cavity 313 includes, but is not limited to, a "V" shape, a "U" shape, or other contoured configuration. Illustratively, the cavity 313 includes a bottom wall and two sidewalls extending obliquely upward from opposite sides of the bottom wall, the sidewalls being spaced apart from each other from bottom to top, and each sidewall being provided with a plurality of flow dividing holes 311 along a length direction.

As shown in fig. 5 and 7, in one embodiment, the fire grate body 10 further includes two side plates 12 disposed on two sides of the width direction of the top plate 11, the two side plates 12 are disposed to extend downward with respect to the top plate 11, the air flow channel 101 is formed between the two side plates 12, the split flame stabilizing member 30 further includes two second split flame stabilizing plates 32 disposed on two sides of the width direction of the first split flame stabilizing plate 31, and the two second split flame stabilizing plates 32 are disposed on the inner sides of the two side plates 12 in a one-to-one correspondence; each side plate 12 is provided with a side air outlet hole 121, a side diversion channel 301 communicated with the air flow channel 101 is formed between each second diversion flame stabilizing plate 32 and the corresponding side plate 12, and the side diversion channel 301 is communicated with the side air outlet hole 121 on the corresponding side plate 12.

In the present embodiment, the air flow in the air flow passage 101 can be divided into a plurality of air flows when flowing to the split flame holder 30, and the air flow in the middle flows toward the first split flame holder plate 31 and is combusted to form a main flame through the metal mesh 20 and the top plate 11 to the combustion flame holes 111. The airflows at both sides respectively flow to the side diversion channels 301 at both sides of the diversion flame stabilizing piece 30, and then flow out from the side air outlet holes 121 on the corresponding side plate 12, and the mixed gas flowing out from the side air outlet holes 121 can be ignited to form side flames at the position (i.e. the flame stabilizing port 402) of the side part of the fire grate body 10, which is close to the combustion fire hole 111. On one hand, the main flame stabilizing effect is achieved, on the other hand, the side gas amount is increased, the side space of the fire grate 100 is fully utilized, the total combustion area is increased, and the nitrogen oxides NOx in the combustion tail gas is lower. The NOx in the general gas water heater is mainly generated due to high combustion temperature, partial gas of the main flame is shared by the side flame, the hot strength of the fire holes of the main flame area is reduced, the temperature of the main flame area is reduced, and the generation of the NOx is effectively inhibited. Meanwhile, when a plurality of fire rows 100 of the burner are arranged side by side, the side flames passing through the side portions of the fire row body 10 are also advantageous for transferring fire between adjacent two fire rows 100.

As shown in fig. 5, optionally, a plurality of side air outlet holes 121 are formed on each side plate 12 at intervals along the length direction, so that a better gas splitting effect can be achieved, and the combustion distribution of each part in the length direction of the fire grate 100 is more uniform.

The plurality of side air outlet holes 121 on the side plate 12 may be arranged in a single row or in a plurality of rows. In an embodiment, all the side air outlet holes 121 on each side plate 12 are arranged in at least two rows of air outlet holes along the height direction of the side plate 12, and each row of air outlet holes includes a plurality of side air outlet holes 121 arranged at intervals along the length direction of the side plate 12. Illustratively, as shown in fig. 5, all the side air outlet holes 121 on the side plate 12 are arranged in two rows of air outlet holes in the height direction of the side plate 12. The air flow speed of the side air outlet holes 121 positioned in the lower row is relatively high, and the air flow speed of the side air outlet holes 121 positioned in the upper row is relatively low, so that certain speed difference exists between the side air outlet holes 121 in each row, and different combustion working conditions can be better adapted. Each exhaust hole row includes a plurality of side air outlet holes 121 arranged at intervals along the length direction of the side plate 12, which can increase the air outlet amount and make the distribution of the combustion gas more uniform. The shape of the side air outlet holes 121 may be set according to practical needs, including but not limited to circular holes, bar holes, square holes, triangular holes or other special-shaped holes, etc. The shapes of the plurality of side air outlet holes 121 of the same row may be the same or different, and the shapes of the plurality of side air outlet holes 121 of different rows may be the same or different. Illustratively, the plurality of side exit holes 121 in the upper row of exit holes each employ a circular hole; the plurality of side air outlet holes 121 in the lower row of air outlet holes include circular holes and bar-shaped holes.

Regarding the communication between the air flow channel 101 and the side diversion channel 301, for example, in one embodiment, a bottom diversion opening 302 is formed between the lower edge of the second diversion flame stabilizing plate 32 and the corresponding side plate 12, and the air flow channel 101 communicates with the side diversion channel 301 through the bottom diversion opening 302. In this way, the air flow in the air flow channel 101 can flow into the side split channel 301 through the bottom split port 302, and then flows out through the side air outlet hole 121. For another example, in another embodiment, the second flow-dividing flame stabilizing plate 32 is provided with side flow dividing ports 303, and the air flow channel 101 communicates with the side flow dividing channel 301 via the side flow dividing ports 303. In this way, the air flow in the air flow passage 101 can flow into the side split passage 301 through the side split port 303, and then flows out through the side air outlet hole 121.

Optionally, as shown in fig. 7, a bottom split-flow port 302 is formed between the lower side edge of the second split-flow flame stabilizing plate 32 and the corresponding side plate 12, and the air flow channel 101 communicates with the side split-flow channel 301 via the bottom split-flow port 302; the second flow-dividing flame stabilizing plate 32 is provided with side flow dividing ports 303, and the air flow passage 101 communicates with the side flow dividing passage 301 via the side flow dividing ports 303. In this way, a part of the airflow in the airflow channel 101 can flow into the side diversion channel 301 through the bottom diversion opening 302, and another part of the airflow can flow into the side diversion channel 301 through the side diversion opening 303, so that the side surface of the fire grate 100 forms a graded air outlet effect, and the side surface of the fire grate 100 can be ensured to have air flowing out for combustion under the working conditions of different loads.

Referring to fig. 7, 9 and 11, in one embodiment, the second flow-dividing flame stabilizing plate 32 includes an abutting portion 321 abutting against the corresponding side plate 12, and a recess portion 322 recessed toward a side facing away from the side plate 12 with respect to the abutting portion 321, the recess portion 322 and the corresponding side plate 12 form the side-dividing channel 301 therebetween, the recess portion 322 is provided with a side-dividing port 303, and the air flow channel 101 communicates with the side-dividing channel 301 via the side-dividing port 303.

In the present embodiment, the recess 322 may be formed on the second flow dividing flame stabilizing plate 32 by a profiling process, and the manufacturing process may be simplified. The number of the concave portions 322 may be single or plural according to actual needs. For example, the plurality of side air outlets 121 on the side plate 12 may be divided into a plurality of groups, a concave portion 322 is disposed on the second split flame stabilizing plate 32 corresponding to each group of side air outlets 121, and a plurality of side split-flow ports 303 are disposed on a wall surface of each concave portion 322 corresponding to the side plate 12. Illustratively, as shown in fig. 9, the second flow-dividing flame holding plate 32 is provided with two recesses 322 at intervals in the length direction. Optionally, the bottom of the recess 322 is open such that a bottom shunt 302 is formed between the bottom edge of the recess 322 and the corresponding side plate 12. Optionally, the side of the recess 322 facing away from the bottom split-flow port 302 is inclined toward the corresponding side plate 12, so as to perform a certain guiding function on the air flow, so as to guide the air flow in the side split-flow channel 301 to the side air outlet hole 121 on the side plate 12. In addition, the second flow-dividing flame stabilizing plate 32 further includes an abutting portion 321 surrounding the outer edge of the recess 322, and the abutting portion 321 abuts against the corresponding side plate 12, so that the outer edge of the recess 322 can be sealed. The second flow-dividing flame stabilizing plate 32 and the corresponding side plate 12 can be easily connected and fixed by the abutting portion 321, and for example, the abutting portion 321 and the side plate 12 can be welded and fixed.

Referring to fig. 1 to 4, in one embodiment, the fire grate 100 further includes a flame stabilizing device 40 sleeved on the top of the fire grate body 10, the flame stabilizing device 40 has a cavity with an open top, a side air outlet channel 401 is formed between a side wall of the cavity and each side plate 12, the side air outlet channel 401 is communicated with the side air outlet holes 121 on the corresponding side plate 12, and a flame stabilizing port 402 is formed by opening the top of the side air outlet channel 401.

In this embodiment, by disposing the flame stabilizing device 40 on the top of the fire grate body 10, a side air outlet channel 401 is formed between the cavity of the flame stabilizing device 40 and the side plate 12 of the fire grate body 10; the air flow in the air flow channel 101 in the two side areas enters the side flow distribution channel 301 through the two sides of the flow distribution flame stabilizing piece 30, flows into the side air outlet channel 401 through the side air outlet holes 121 on the side plate 12, flows out from the flame stabilizing port 402 on the top surface and burns to form side flames, so that the air outlet amount of the fire grate 100 can be increased, and the burning flames are more stable. And through disposing the metal mesh 20, the shunt flame stabilizing piece 30 and the flame stabilizing device 40 on the fire grate body 10, dual flame stabilizing effect can be formed, the single-chip heat load combustion application range can be improved, the problem that small load cannot be used low can be solved, the structure is simple, the manufacture is convenient, the cost is low, and the use requirement of low nitrogen emission of the whole machine can be met.

As an example, as shown in fig. 4, the flame stabilizing device 40 includes two flame stabilizing sheets 41 disposed outside the two side plates 12, and the two flame stabilizing sheets 41 may be welded or riveted to the corresponding side plates 12, and a side air outlet channel 401 is formed between each flame stabilizing sheet 41 and the corresponding side plate 12. It will be appreciated that the two flame holding fins 41 extend upward and protrude from the top of the flame holder body 10, and can function as a flame guide and holding to gather side flames toward the target area of the flame holder 100, which is beneficial to improving the heat gathering effect during combustion.

In one embodiment, the two flame stabilizing sheets 41 are respectively provided with a plurality of lateral convex hulls which are arranged at intervals along the length direction of the side plate 12. It can be understood that the fire grate 100 is formed by connecting a plurality of fire grate bodies 10 side by side, and the flame stabilizing device 40 is disposed on the upper portion of each fire grate body 10, and the positioning function of two adjacent fire grate bodies 10 or the function of increasing the secondary air supply can be achieved by disposing a plurality of lateral convex hulls on the flame stabilizing plates 41.

Referring to fig. 1, 2 and 12, in one embodiment, the plurality of lateral protrusions include a plurality of positioning protrusions 412 facing away from the cavity and/or a plurality of inner protrusions 413 recessed toward the side plate 12. It can be understood that the positioning convex hulls 412 are arranged to protrude outwards for the flame stabilizing sheets 41, and at this time, the adjacent flame stabilizing sheets 41 of the two adjacent fire row bodies 10 are propped against and positioned by the plurality of positioning convex hulls 412, so that gaps between adjacent fire row 100 monomers are consistent, and supply of secondary air is ensured. The inner convex hull 413 is formed by concave shape of the flame stabilizing piece 41 toward the side plate 12, so that the flow area of secondary air supply between adjacent fire rows 100 can be increased, and the supply amount of secondary air can be further increased. Alternatively, the inner convex hull 413 may include a swaged tooth structure, a pull through swage structure, or the like.

Further, as shown in fig. 1, the upper edge of the flame holding plate 41 is provided with a plurality of notches 411. In this embodiment, by providing a plurality of notches 411 on the upper edge of the flame stabilizing piece 41, the generation of vortex can be reduced, the air flow resistance can be reduced, and the flame combustion stability can be higher. Alternatively, the plurality of notches 411 may be spaced apart along the length of the flame holding plate 41.

The utility model also provides a combustion device, which comprises a fire row 100, wherein the specific structure of the fire row 100 refers to the embodiment, and as the combustion device adopts all the technical schemes of all the embodiments, at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

By way of example, the combustion device may be a burner, such as an atmospheric burner, a rich-lean burner, or other forms of water-cooled burner.

The combustion device may be a gas water heater, a boiler, or the like, as an example.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (12)

1. A fire grate, comprising:

The fire grate comprises a fire grate body, a fire grate and a fire grate, wherein an airflow channel is formed in the fire grate body, the fire grate body is provided with a top plate, and a plurality of combustion fire holes communicated with the airflow channel are formed in the top plate;

the metal net is arranged on one side of the top plate and corresponds to the plurality of combustion fire holes; and

The flow-dividing flame-stabilizing piece is arranged in the airflow channel and is provided with a plurality of flow-dividing holes communicated with a plurality of combustion fire holes.

2. A fire grate as claimed in claim 1 wherein the metal mesh has a plurality of layers;

And/or a plurality of the combustion fire holes are distributed at intervals along the length direction of the top plate to form a plurality of groups of fire hole groups, wherein the plurality of groups of fire hole groups comprise a middle fire hole group positioned in the middle area of the top plate and two end fire hole groups respectively positioned in the two end areas of the top plate; the metal net comprises a middle net piece which is arranged corresponding to the middle fire hole group and two end net pieces which are arranged corresponding to the two end fire hole groups respectively, and the number of layers of the end net pieces is larger than that of the middle net pieces.

3. The fire grate of claim 1 wherein a plurality of said fire holes are spaced apart along the length of said top plate to form a plurality of groups of fire holes, each said group of fire holes including a first fire hole and a second fire hole; wherein,

The opening area of the first combustion fire hole is different from the opening area of the second combustion fire hole;

and/or the fire hole centers of the first combustion fire holes and the fire hole centers of the second combustion fire holes are arranged in a staggered manner in the width direction of the top plate;

And/or, at least part of the hole edges of the combustion fire holes are provided with convex teeth.

4. The fire grate of claim 1 wherein the top of said flow-splitting flame holders is provided with ribs for spacing any two adjacent said flow-splitting holes, the projection of said ribs toward said top plate being at least partially within the area defined by said combustion fire holes.

5. The fire grate of claim 1 wherein said grate body has a first side and a second side disposed opposite along a length thereof, said airflow path includes an inlet port disposed on said one side, an ejector section extending from said inlet port toward said second side, a curved section upwardly curved from an end of said ejector section remote from said inlet port, and a splitter section extending from an end of said curved section remote from said ejector section toward said first side, said splitter section communicating with a plurality of said combustion holes, and a speed reducing structure disposed in said airflow path at a corner portion of said airflow path corresponding to said curved section and said splitter section.

6. A fire grate as claimed in any one of claims 1 to 5 wherein said split flame holding member includes a first split flame holding plate provided with a plurality of said split apertures, said first split flame holding plate being located below said top plate, said first split flame holding plate being provided with a recess on a side thereof facing said top plate;

The metal net is positioned between the top plate and the first split flame stabilizing plate; or the metal net is positioned on one side of the top plate, which is away from the first diversion flame stabilizing plate.

7. The fire grate of claim 6 wherein said metal mesh is positioned between said top plate and said first split flame holding plate, wherein a side edge of said first split flame holding plate abuts said metal mesh, and wherein a central region of said first split flame holding plate is recessed toward a side facing away from said metal mesh to form said cavity.

8. The fire grate of claim 6 wherein said fire grate body further comprises two side plates disposed on opposite sides of said top plate in a width direction, said side plates extending downward relative to said top plate to form said air flow passage therebetween, said split flame stabilizing member further comprising two second split flame stabilizing plates disposed on opposite sides of said first split flame stabilizing plate in a width direction, said second split flame stabilizing plates disposed on inner sides of said side plates in a one-to-one correspondence;

Each side plate is provided with a side air outlet hole, a side flow distribution channel communicated with the air flow channel is formed between each second flow distribution flame stabilizing plate and the corresponding side plate, and the side flow distribution channel is communicated with the corresponding side air outlet hole on the side plate.

9. The fire grate of claim 8 wherein a bottom split port is formed between a lower edge of said second split flame holding plate and the corresponding side plate, said air flow passage communicating with said side split passage via said bottom split port;

And/or the second flow-dividing flame stabilizing plate is provided with a side flow dividing opening, and the air flow channel is communicated with the side flow dividing channel through the side flow dividing opening.

10. The fire grate of claim 8 wherein said second flow dividing flame stabilizing plate includes an abutment portion abutting against a corresponding said side plate and a recess portion recessed relative to said abutment portion toward a side facing away from said side plate, said recess portion and corresponding said side plate defining said side dividing channel therebetween, said recess portion being provided with side dividing ports through which said air flow channel communicates with said side dividing channel.

11. The fire grate of claim 8 further comprising a flame stabilizing device positioned over the top of the grate body, the flame stabilizing device having an open-top cavity, a side air outlet channel being formed between a side wall of the cavity and each of the side plates, the side air outlet channel being in communication with the side air outlet holes in the corresponding side plate, the side air outlet channel being open at the top to form a flame stabilizing port.

12. A combustion apparatus comprising a fire grate as claimed in any one of claims 1 to 11.