CN217635624U

CN217635624U - Burner block and low NOx combustor

Info

Publication number: CN217635624U
Application number: CN202221432742.8U
Authority: CN
Inventors: 毛小亮; 李金科; 康翼; 李宁; 程逍; 刘韫砚
Original assignee: Tianhua Institute Nanjing Intelligent Manufacturing Co ltd
Current assignee: Tianhua Institute Nanjing Intelligent Manufacturing Co ltd
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-10-21
Anticipated expiration: 2032-06-09

Abstract

The utility model relates to a chemical industry equipment technical field especially relates to a combustor burner block, it includes the main part piece, run through being provided with central runner in the main part piece, a plurality of one-level drainage channels have been seted up to the lateral wall of main part piece, every one-level drainage channel all includes by outer contraction section to interior being linked together, low pressure section and expansion section, the both ends of low pressure section are connected respectively in the path end of contraction section and expansion section, contraction section communicates in furnace, the expansion section communicates in central runner, combustion assembly sprays fuel gas to one-level drainage channel, combustion air flows in central runner. The utility model also provides a low NOx combustor, including combustion assembly and foretell burner block, low NOx combustor sets up on the heating furnace, and the burner block setting is in the bottom department of heating furnace. The burner block and the low NOx burner can reduce the generation amount of NOx, thereby reducing environmental pollution.

Description

Burner block and low NOx combustor

Technical Field

The utility model relates to a chemical industry equipment technical field especially relates to a burner block and low NOx combustor.

Background

Under high temperature and oxygen excess conditions, a large amount of NOx is generated by the mixed combustion of the fuel gas and the combustion air, and the amount of NOx generated increases as the combustion temperature increases. The existing burner can generate high-level NOx emission, cannot meet the requirements of current environmental protection standards and regulations, and inevitably causes serious environmental pollution.

Therefore, a burner block and a low NOx burner are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a burner block when being applied to the combustor, helps reducing NOx's formation volume, reduces environmental pollution.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a burner block, includes the main part piece, be provided with central flow channel in the main part piece, a plurality of one-level drainage channels have been seted up to the lateral wall of main part piece, every one-level drainage channel all includes from outer to interior contraction section, low pressure section and the expansion section that is linked together, the both ends of low pressure section connect respectively in the path end of contraction section with the path end of expansion section, the contraction section communicates in furnace, the expansion section communicate in central flow channel, combustion component to one-level drainage channel sprays fuel gas, combustion air is in flow in the central flow channel.

As a preferred scheme of the burner block, the side wall of each primary drainage channel is tangent to the inner wall of the main body piece.

As the preferred scheme of a burner block, it is a plurality of one-level drainage channels follow the even interval setting in circumference of main part, and it is a plurality of one-level drainage channels is located same circumference.

As a preferred scheme of the burner block, a first annular boss is arranged on the inner wall of the main body part, and the first annular boss is arranged at the upstream of the primary drainage channel along the flow direction of combustion air.

As a burner block's preferred scheme, one-level drainage channel divide into the multilayer, the multilayer one-level drainage channel is followed the axial interval of main part sets up, every layer one-level drainage channel includes along a plurality of the even setting of circumference interval of main part one-level drainage channel.

As a preferred scheme of the burner block, a plurality of second annular bosses are arranged on the inner wall of the main body part, the second annular bosses and the plurality of layers of the primary drainage channels are alternately arranged along the axial direction of the main body part, and the second annular bosses are arranged close to the downstream primary drainage channels along the flow direction of combustion air.

As an optimal scheme of burner block, a plurality of second grade drainage channels have been seted up to the lateral wall of main part, second grade drainage channel with one-level drainage channel one-to-one, second grade drainage channel's one end communicate in the low pressure section, the other end communicate in furnace.

As a preferred scheme of the burner block, the contraction angle of the contraction section ranges from 30 degrees to 150 degrees, and the expansion angle of the expansion section ranges from 5 degrees to 60 degrees.

Another object of the present invention is to provide a low NOx burner, which can reduce the amount of NOx generated, thereby reducing environmental pollution.

a low NOx burner comprises a combustion assembly and the burner block, wherein the low NOx burner is arranged on a heating furnace, and the burner block is arranged on the inner wall of the bottom of the heating furnace.

As a preferred scheme of the low NOx burner, the low NOx burner further comprises an air box, wherein the air box is arranged on the outer surface of the bottom of the heating furnace, and an inner cavity of the air box is communicated with the central flow channel.

The utility model has the advantages that:

the utility model provides a burner block, including the main part, be provided with central runner in the main part, a plurality of one-level drainage channels have been seted up to the lateral wall of main part, and every one-level drainage channel all includes by outer contraction section, low pressure section and the expansion section that is linked together to interior, and the both ends of low pressure section are connected respectively in the path end of contraction section and expansion section, and the contraction section communicates in furnace, and the expansion section communicates in central runner, and combustion assembly sprays fuel gas to one-level drainage channel, and combustion-supporting air flows in central runner. The fuel gas sprays towards the flow guide channel, and a low-pressure area is formed at the entrance of the contraction section, so that suction is caused to the flue gas in the hearth, and the flue gas is sucked into the flow guide channel. Moreover, the structure that the drainage channel contracts earlier and expands later can further strengthen the suction to the flue gas to make the flow of flue gas in the drainage channel bigger, more flue gas gets into central runner in the unit interval, can make the content of flue gas improve in the mist of flue gas, fuel gas and combustion air, oxygen content reduces, and NOx's formation reduces.

The utility model also provides a low NOx combustor, including combustion assembly and foretell burner block, low NOx combustor sets up on the heating furnace, and the burner block setting is in the bottom inner wall department of heating furnace. It is known that the low NOx burner can reduce the amount of NOx produced, thereby reducing environmental pollution.

Drawings

Fig. 1 is a schematic structural view of a burner block provided in an embodiment of the present invention;

FIG. 2 is a half sectional view of a burner block according to an embodiment of the present invention;

FIG. 3 isbase:Sub>A cross-sectional view A-A of FIG. 2;

FIG. 4 is a partial schematic view of FIG. 3;

fig. 5 is a partial cross-sectional view of a low NOx burner provided in a third embodiment of the present invention.

In the figure:

1. a main body member; 101. a center flow passage; 102. a primary drainage channel; 1021. a contraction section; 1022. a low-pressure section; 1023. an expansion section; 11. a first annular boss; 12. a flame stabilizing structure; 2. separating ribs;

800. a fuel injector; 900. and (4) a wind box.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example one

The existing burner can generate high-level NOx emission, cannot meet the requirements of current environmental protection standards and regulations, and inevitably causes serious environmental pollution. Therefore, the embodiment provides a burner block which is applied to a burner to reduce the generation amount of NOx and reduce environmental pollution.

As shown in fig. 1-2, the burner block comprises a main body 1 and a spacer 2 arranged outside the main body 1, wherein a central flow passage 101 is arranged in the main body 1. The main body part 1 is provided with a flame stabilizing structure 12 near the outlet, and the side wall of the main body part 1 is provided with a plurality of primary drainage channels 102.

As shown in fig. 3-4, each primary flow-guiding channel 102 includes a contracting section 1021, a low-pressure section 1022 and an expanding section 1023 which are communicated from outside to inside, two ends of the low-pressure section 1022 are respectively connected to a small-diameter end of the contracting section 1021 and a small-diameter end of the expanding section 1023, the contracting section 1021 is communicated with the furnace chamber, the expanding section 1023 is communicated with the central flow channel 101, the combustion assembly sprays fuel gas to the primary flow-guiding channel 102, and combustion air flows in the central flow channel 101. The fuel gas sprays towards the drainage channel, will certainly form the low pressure region at shrink section 1021 entrance to cause suction to the flue gas in the furnace, the flue gas is inhaled the drainage channel. Moreover, the structure that the drainage channel contracts earlier and then expands can further strengthen the suction to the flue gas to make the flow of flue gas in drainage channel bigger, more flue gas gets into central channel 101 in the unit interval, can make the content of flue gas improve in flue gas, fuel gas and combustion air's the mist, oxygen volume reduces, thereby makes NOx's formation reduce.

Preferably, the side wall of each primary flow guiding channel 102 is arranged tangentially to the inner wall of the main body member 1, so that the mixed gas of the flue gas and the fuel gas entering the central flow channel 101 from the flow guiding channel can form a rotational flow along the inner wall of the main body member 1, thereby enhancing the mixing uniformity of the flue gas, the fuel gas and the combustion air.

Preferably, a plurality of primary flow guide channels 102 are uniformly arranged along the circumferential direction of the main body member 1 at intervals, and the plurality of primary flow guide channels 102 are positioned on the same circumference, so that the uniformity of the mixed gas can be further enhanced.

In order to prevent the flow of the combustion-supporting gas in the central flow passage 101 from blocking the outlet of the expansion section 1023, preferably, the inner wall of the main body 1 is circumferentially provided with a first annular boss 11, and the first annular boss 11 is arranged upstream of the primary flow guiding channel 102 along the flow direction of the combustion-supporting air, so that the outlet of the expansion section 1023 is positioned in an empty recess formed by the first annular boss 11 and the inner wall of the main body 1, and the flow velocity loss of the mixed gas of the flue gas and the fuel gas is reduced.

Preferably, the contraction section 1021 has a contraction angle α, fig. 4, in the range of 30 ° -150 °, and the expansion section 1023 has an expansion angle β, fig. 4, in the range of 5 ° -60 °. The size and angle of contraction a of the convergent section 1021, the size of the throat, and the size and angle of divergence β of the divergent section 1023 are determined by Computational Fluid Dynamics (CFD) simulations to achieve satisfactory results.

Example two

The embodiment discloses a burner block, and the difference between the burner block in the embodiment and the burner block in the first embodiment is as follows: one-level drainage channel divide into the multilayer, and multilayer one-level drainage channel sets up along the axial interval of main part, and every layer of one-level drainage channel includes a plurality of one-level drainage channels that evenly set up along the circumference interval of main part to further increase the proportion of fuel gas and flue gas, reduce combustion-supporting gas's proportion, with the formation that reduces NOx.

Correspondingly, a plurality of second annular bosses are arranged on the inner wall of the main body piece, the second annular bosses and the multi-layer primary drainage channel are alternately arranged along the axial direction of the main body piece, and the second annular bosses are arranged close to the downstream primary drainage channel along the flow direction of combustion air. The purpose of the second annular boss is the same as that of the first annular boss in the first embodiment, and is not described again here.

In order to further improve the proportion of flue gas among the mist, preferably, a plurality of second grade drainage channels have been seted up to the lateral wall of main part, second grade drainage channel and one-level drainage channel one-to-one, and second grade drainage channel's one end communicates in low pressure section, and the other end communicates in furnace. According to the Venturi effect, more hearth smoke can be sucked into the secondary drainage channel by the low-pressure environment of the low-pressure section, so that the hearth smoke enters the primary drainage channel and enters the central flow channel.

In addition, the rest of the structure of the burner block provided in this embodiment is the same as that of the burner block in the first embodiment, and is not described herein again.

EXAMPLE III

As shown in fig. 5, the low NOx burner provided in this embodiment includes a burner block in the first embodiment and the burner assembly in the second embodiment. The low NOx burner is arranged on the heating furnace, the burner block is arranged on the inner wall of the bottom of the heating furnace, and the combustion assembly can be arranged at an inlet of a contraction section 1021 of the primary drainage channel 102. The combustion assembly comprises a fuel nozzle 800, and the low NOx burner further comprises a windbox 900, the windbox 900 is disposed at the outer surface of the bottom of the heating furnace, and the inner cavity of the windbox 900 is communicated with the central flow passage 101 to deliver combustion air into the central flow passage 101. It is known that the low NOx burner can reduce the amount of NOx produced, thereby reducing environmental pollution.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a burner block, a serial communication port, includes main part (1), be provided with central runner (101) in main part (1), a plurality of one-level drainage channel (102) have been seted up to the lateral wall of main part (1), every one-level drainage channel (102) all include by outer contraction section (1021) that are linked together to interior, low pressure section (1022) and expansion section (1023), the both ends of low pressure section (1022) connect respectively in the path end of contraction section (1021) with the path end of expansion section (1023), contraction section (1021) communicate in furnace, expansion section (1023) communicate in central runner (101), combustion component to one-level drainage channel (102) spray fuel gas, combustion-supporting air is in flow in central runner (101).

2. The burner block according to claim 1, characterized in that the side wall of each primary flow channel (102) is arranged tangentially to the inner wall of the body piece (1).

3. The burner block according to claim 1, wherein a plurality of the primary flow guide channels (102) are uniformly spaced along the circumference of the main body member (1), and a plurality of the primary flow guide channels (102) are located on the same circumference.

4. The burner block according to claim 3, characterized in that the inner wall of the body member (1) is provided with a first annular boss (11), the first annular boss (11) being arranged upstream of the primary flow guide channel (102) in the flow direction of the combustion air.

5. The burner block of claim 1, wherein the primary flow-directing channels are divided into a plurality of layers, the plurality of layers of primary flow-directing channels are arranged at intervals along an axial direction of the main body, and each layer of primary flow-directing channels comprises a plurality of primary flow-directing channels evenly arranged at intervals along a circumferential direction of the main body.

6. The burner block according to claim 5, wherein the inner wall of the main body member is provided with a plurality of second annular bosses, the plurality of second annular bosses and the plurality of layers of primary flow guide channels are alternately arranged along the axial direction of the main body member, and the second annular bosses are arranged along the flow direction of the combustion air and close to the downstream primary flow guide channels.

7. The burner block according to claim 1, wherein a plurality of secondary flow guide channels are formed in the side wall of the main body member (1), the secondary flow guide channels correspond to the primary flow guide channels (102) one to one, one end of each secondary flow guide channel is communicated with the low-pressure section (1022), and the other end of each secondary flow guide channel is communicated with the furnace chamber.

8. The burner block according to claim 1, wherein the contraction angle of the contraction section (1021) ranges from 30 ° to 150 °, and the expansion angle of the expansion section (1023) ranges from 5 ° to 60 °.

9. A low NOx burner comprising a burner block and a burner block according to any one of claims 1 to 8, said low NOx burner being disposed on a furnace, said burner block being disposed at a bottom inner wall of said furnace.

10. The low NOx burner of claim 9, further comprising a windbox (900), the windbox (900) being disposed at a bottom outer surface of the furnace, an inner cavity of the windbox (900) communicating with the center flow channel (101).