CN219102985U - Premixing pure ammonia combustion structure for industrial kiln - Google Patents

Abstract

The utility model belongs to the field of combustion equipment, and discloses a premixed pure ammonia combustion structure for an industrial kiln, wherein an outer sleeve is provided with a first cavity with an opening structure at the front end; the inner sleeve is provided with a second cavity, the front end of the inner sleeve is provided with an end plate, the end plate is provided with an air outlet structure, the rear end of the inner sleeve is provided with a plurality of first air inlets, the first air inlets are uniformly arranged along the peripheral surface of the inner sleeve, and the air outlet structure and the first air inlets are communicated with the second cavity; the ammonia gas pipeline extends forwards and backwards, the front end of the ammonia gas pipeline penetrates through the rear end of the inner sleeve and stretches into the second cavity, the front end of the ammonia gas pipeline is provided with a plurality of first ammonia gas spray holes, and the first ammonia gas spray holes are uniformly arranged along the peripheral surface of the ammonia gas pipeline; the wind disc is arranged at the front end of the inner sleeve and covers the gap between the outer peripheral surface of the inner sleeve and the inner peripheral surface of the outer sleeve, and the wind disc is provided with a first swirl groove communicated with the first cavity. The utility model can realize stable combustion of pure ammonia, reduce the generation of nitrogen oxides and realize zero carbon emission.

Description

Premixing pure ammonia combustion structure for industrial kiln

Technical Field

The utility model belongs to the technical field of combustion equipment, and particularly relates to a premixed pure ammonia combustion structure for an industrial kiln.

Background

At present, the influence of carbon dioxide emission on global climate change is more and more paid attention to worldwide people, all countries strive to reduce carbon emission, energy structures are adjusted and optimized, and a clean energy is explored to well replace traditional fossil fuels. Among them, hydrogen and ammonia are zero-carbon fuel with high attention, and compared with hydrogen, ammonia has the advantages of easy liquefaction and storage, mature production technology and the like, so that ammonia has good application potential in clean combustion. However, ammonia as a nitrogen-containing fuel has a problem of high nitrogen oxide emissions.

In the related art, as disclosed in the patent with the application number 201710861941.8, a combustion device for spraying ammonia at the center of a burner of an industrial pulverized coal boiler, and as disclosed in the patent with the application number 202210504241.4, an ammonia-doped cyclone burner with a baffling structure are all formed by adopting an ammonia-doped combustion mode, ammonia is doped in fossil fuel, carbon dioxide is generated after combustion, and the aim of zero carbon emission cannot be achieved.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model aims to provide a premixed pure ammonia combustion structure for an industrial kiln, which can realize stable combustion of pure ammonia, reduce generation of nitrogen oxides and realize the aim of zero carbon emission.

The technical scheme adopted for solving the technical problems is as follows:

the utility model provides a premixed pure ammonia combustion structure for an industrial kiln, which comprises the following components:

the outer sleeve is provided with a first cavity, and the front end of the first cavity is of an opening structure;

the inner sleeve is provided with a second cavity, the front end of the inner sleeve is provided with an end plate, the end plate is provided with an air outlet structure, the rear end of the inner sleeve is provided with a first air inlet hole, the first air inlet hole is provided with a plurality of air inlets and is uniformly arranged along the peripheral surface of the inner sleeve, and the air outlet structure and the first air inlet hole are communicated with the second cavity;

the front end of the ammonia gas pipeline penetrates through the rear end of the inner sleeve and stretches into the second cavity, a first ammonia gas spray hole is formed in the front end of the ammonia gas pipeline, and a plurality of first ammonia gas spray holes are formed in the first ammonia gas spray hole and are uniformly arranged along the outer peripheral surface of the ammonia gas pipeline;

the wind disc is arranged at the front end of the inner sleeve, the wind disc covers a gap between the outer circumferential surface of the inner sleeve and the inner circumferential surface of the outer sleeve, and the wind disc is provided with a first swirl groove communicated with the first cavity.

The utility model has at least the following beneficial effects: the ammonia in the ammonia pipeline flows into the second cavity of the inner sleeve through the first ammonia spray hole, and meanwhile, a part of air in the first cavity of the outer sleeve flows into the second cavity through the first air inlet hole, and as the central axis of the first air inlet hole and the central axis of the first ammonia spray hole are perpendicular to the central axis extending forwards and backwards of the second cavity, the forward flowing speed of the ammonia and the air flowing into the second cavity is low, so that the contact time of the air and the ammonia in the second cavity is increased, and the full contact and partial mixing are achieved, so that premixed gas is formed; the premixed gas flows out of the air outlet structure of the end plate and can form a rich premixed flame after being ignited, unburned ammonia can reduce nitrogen oxides generated by combustion in the rich premixed flame, the emission of the nitrogen oxides in tail gas is reduced, meanwhile, the other part of air of the first cavity flows out of the first cyclone groove of the air disc, a rotating air flow is formed at the periphery of the rich premixed flame, the air flow has a good stirring effect, the air and the unburned ammonia are mixed, the unburned ammonia in the rich premixed flame can be further oxidized, the ammonia can be fully utilized, and stable combustion of the ammonia can be ensured.

As a further improvement of the technical scheme, the end plate is provided with a central hole and second swirl grooves, the second swirl grooves are provided with a plurality of swirl grooves and are circumferentially arranged around the central hole, and the central hole and the second swirl grooves form the air outlet structure and are communicated with the second cavity. By the design, one part of premixed gas can flow out from the central hole, the other part of premixed gas flows out from the second cyclone groove, after the premixed gas is ignited, a rich premixed cyclone flame can be formed, nitrogen oxides generated by ammonia combustion can be reduced by unburned ammonia, and emission of the nitrogen oxides is reduced.

As a further improvement of the technical scheme, the front end face of the end plate is provided with a plurality of cylinders, the cylinders extend forwards and backwards, the cylinders are provided with first inner cavities, the first inner cavities penetrate through the end plate and are communicated with the second cavities, the outer peripheral face of each cylinder is provided with a plurality of first air outlet holes, and the first air outlet holes are of an air outlet structure and are communicated with the first inner cavities. By adopting the structure, the premixed gas flows out from the first air outlet holes of the plurality of cylinders, and the forward flow speed of the premixed gas can be effectively reduced and the stable combustion of ammonia gas is promoted because the first air outlet holes are arranged on the peripheral wall surface of the cylinder.

As a further improvement of the technical scheme, one cylinder is a central cylinder, the rest cylinders are peripheral cylinders, the central cylinder is positioned in the middle of the end plate, and a plurality of peripheral cylinders are circumferentially arranged around the central cylinder. The design makes the cylinder arrange reasonably and properly on the end plate, promotes the premixed gas to burn and forms stable flame, and ensures that the premixed gas flowing out of the cylinder can fully contact and mix with the air flowing out of the first cyclone groove, so that the unburned ammonia can be fully burnt under the oxidation action of the air.

As a further improvement of the technical scheme, the front end face of the end plate is provided with a central sleeve, the central sleeve is provided with a second inner cavity, the second inner cavity penetrates through the end plate and is communicated with the second cavity, the outer peripheral face of the central sleeve is provided with a plurality of second air outlet holes, and the second air outlet holes are of an air outlet structure and are communicated with the second inner cavity. The arrangement is such that the premixed gas can flow out from the second air outlet hole of the central sleeve, and the central axis of the second air outlet hole is perpendicular to the front and back extending central axis of the central sleeve, so that the forward flowing speed of the premixed gas is reduced, and the stable combustion of ammonia gas is promoted.

As a further improvement of the above technical solution, the front end of the central sleeve is provided with a blunt body. The blunt body is arranged at the front end of the central sleeve, and the blunt body has a certain blocking effect on the premixed gas, so that the forward flowing speed of the premixed gas is reduced, the residence time of the premixed gas at the central sleeve is increased, and the ammonia gas can be promoted to burn more stably.

As a further improvement of the above technical solution, the end plate is provided with a plurality of first spray holes communicated with the second cavity, the plurality of first spray holes are circumferentially arranged around the central sleeve, and the first spray holes are located in a projection area of the blunt body in the front-rear direction. A part of the premixed gas flows out of the second air outlet hole, and the other part of the premixed gas flows out of the first spray hole, and the central axis of the first spray hole is perpendicular to the central axis of the second air outlet hole, so that the two parts of the premixed gas can be further mixed.

As a further improvement of the above technical solution, the end plate is provided with a plurality of second spray holes communicated with the second cavity, and the second spray holes are circumferentially arranged around the central sleeve, and the second spray holes are located between the first spray holes and the first swirl slot. The arrangement of the second spray hole can increase the outflow area of the premixed gas in the second cavity, effectively reduce the flow velocity of the premixed gas flowing out of the first spray hole and the second air outlet, prolong the residence time of the premixed gas at the central sleeve, and help to improve the combustion stability of ammonia.

As a further improvement of the technical scheme, the inner sleeve is provided with a second air inlet hole, the second air inlet hole is positioned on the rear end face of the inner sleeve, and the second air inlet hole is provided with a plurality of air inlets and circumferentially arranged around the ammonia pipeline. The arrangement of the second air inlet hole can increase the air quantity flowing into the second cavity, and the central axis of the second air inlet hole is perpendicular to the central axis of the first ammonia gas spray hole, so that the air flowing into the second air inlet hole can be vertically blown to the ammonia gas flowing out of the first ammonia gas spray hole, and partial mixing is well carried out to form premixed gas.

As a further improvement of the technical scheme, the ammonia gas pipeline is provided with a second ammonia gas spray hole, the second ammonia gas spray hole is positioned on the front end face of the ammonia gas pipeline, and the second ammonia gas spray hole is provided with a plurality of ammonia gas spray holes and circumferentially arranged around the ammonia gas pipeline. The ammonia pipeline is also provided with a second ammonia spray hole, so that the amount of ammonia flowing into the second cavity can be increased, and the central axis of the second ammonia spray hole is perpendicular to the central axis of the first air inlet hole, so that the ammonia flowing out of the second ammonia spray hole can be perpendicularly blown to the air flowing out of the first air inlet hole, and good partial mixing is performed to form premixed gas.

Drawings

The utility model is further described below with reference to the drawings and examples;

FIG. 1 is a perspective view of a premixed pure ammonia combustion structure according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a premixed pure ammonia combustion structure according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of a premixed pure ammonia combustion structure according to an embodiment of the utility model;

FIG. 4 is a perspective view of a premixed pure ammonia combustion structure according to a second embodiment of the present utility model;

FIG. 5 is an exploded view of a premixed pure ammonia combustion structure according to a second embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of a premixed pure ammonia combustion structure according to a second embodiment of the utility model;

FIG. 7 is a schematic view of an inner sleeve, end plate and air disk connection according to a second embodiment of the present utility model;

FIG. 8 is a perspective view of a premixed pure ammonia combustion structure according to a third embodiment of the present utility model;

FIG. 9 is an exploded view of a premixed pure ammonia combustion structure according to a third embodiment of the present utility model;

FIG. 10 is a schematic cross-sectional view of a premixed pure ammonia combustion structure according to a third embodiment of the utility model;

figure 11 is a schematic view of the inner sleeve, end plate and air disk connection provided in accordance with a third embodiment of the present utility model.

The figures are marked as follows: 100. an outer sleeve; 110. a first cavity; 200. an ammonia gas pipe; 210. an ammonia gas cavity; 220. a first ammonia gas injection hole; 230. a second ammonia gas injection hole; 300. an inner sleeve; 310. a second cavity; 320. a second air inlet hole; 330. a first air inlet hole; 400. a wind disc; 410. a first swirl groove; 500. an end plate; 510. a central bore; 520. a second swirl groove; 530. a cylinder; 540. a first lumen; 550. a first air outlet hole; 561. a first nozzle hole; 562. a second nozzle hole; 570. a central sleeve; 580. a second air outlet hole; 600. a blunt body.

Detailed Description

Reference will now be made in detail to the present embodiments of the present utility model, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present utility model, but not to limit the scope of the present utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, if there is a word description such as "a plurality" or the like, the meaning of the plurality is one or more, the meaning of the plurality is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and above, below, within, etc. are understood to include the present number. The description of first, second, and third is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1 to 11, several examples of the premixed pure ammonia combustion structure for an industrial kiln according to the present utility model are shown below.

As shown in fig. 1 to 3, the first embodiment of the present utility model provides a premixed pure ammonia combustion structure for an industrial kiln, which includes an outer sleeve 100, an inner sleeve 300, an ammonia gas pipe 200 and a wind disc 400, and can realize stable combustion of pure ammonia, reduce generation of nitrogen oxides, and achieve the goal of zero carbon emission. It will be appreciated that the premixed pure ammonia combustion structure may be used in industrial kilns for heating products such as ceramic products within the kiln.

Wherein, both ends of outer sleeve 100 extend in the front-rear direction, a first cavity 110 is formed in the interior of outer sleeve 100 in a hollow manner, the front end of first cavity 110 is of an open structure, and the rear end of outer sleeve 100 is provided with an inlet so that air flows into first cavity 110 through the inlet. In this embodiment, outer sleeve 100 is cylindrical.

Both ends of the inner sleeve 300 are similarly extended in the front-rear direction, a second cavity 310 is formed in the inner sleeve 300, and the front end of the second cavity 310 is also in an opening structure. In this embodiment, inner sleeve 300 is cylindrical.

The rear end of the inner sleeve 300 is provided with first air intake holes 330, the number of the first air intake holes 330 is plural, and the plurality of first air intake holes 330 are uniformly arranged along the outer circumferential surface of the inner sleeve 300. All the first air intake holes 330 are communicated with the second cavity 310. It is understood that the central axis of the first air intake hole 330 extends in the radial direction of the inner sleeve 300. The first air inlet holes 330 may be provided with a plurality of groups, and the plurality of groups of first air inlet holes 330 are spaced apart in the front-rear direction. All the first air intake holes 330 on the same cross section of the inner sleeve 300 are grouped. In the present embodiment, two sets of the first air intake holes 330 are provided, and the first air intake holes 330 located at the front side are larger in aperture than the first air intake holes 330 located at the rear side.

Inner sleeve 300 is provided with an end plate 500, end plate 500 being located at the front end position of inner sleeve 300, and end plate 500 covering the opening structure of second cavity 310. It will be appreciated that there is substantially no gap, or very little gap, between the outer peripheral surface of the end plate 500 and the inner peripheral surface of the second cavity 310. The connection between end plate 500 and inner sleeve 300 may be achieved by a removable connection or a non-removable connection. Since the second chamber 310 is a cylindrical chamber, the end plate 500 has a circular plate shape.

The end plate 500 is provided with an air outlet structure, which is connected to the second cavity 310, so that the air in the second cavity 310 can flow out through the air outlet structure. In this embodiment, the end plate 500 is provided with a central hole 510 and a second swirl groove 520.

The center hole 510 is located at the center of the end plate 500, and the center hole 510 penetrates through the front and rear end surfaces of the end plate 500 such that the center hole 510 communicates with the second chamber 310. It is understood that the number of the central holes 510 is one, and the aperture of the central holes 510 is larger than that of the first air inlet holes 330 and the first ammonia gas injection holes 220.

The number of the second swirl grooves 520 is plural, the plurality of second swirl grooves 520 are circumferentially arranged with the center hole 510 as a center, and the second swirl grooves 520 penetrate through the front end face and the rear end face of the end plate 500, so that the second swirl grooves 520 are communicated with the second cavity 310. It is understood that the central hole 510 and the second swirl slots 520 form an air outlet structure, so that the air in the second chamber 310 can flow out of the central hole 510 and the second swirl slots 520, respectively.

Both ends of the ammonia gas pipe 200 are extended in the front-rear direction. The ammonia gas pipe 200 is hollow inside to form an ammonia gas cavity 210, and the rear end of the ammonia gas pipe 200 is provided with an ammonia gas inlet so that ammonia gas flows into the ammonia gas cavity 210 through the ammonia gas inlet. In this embodiment, the ammonia gas pipe 200 is cylindrical.

The front end of the ammonia gas pipe 200 penetrates the rear end surface of the inner sleeve 300 and protrudes into the second cavity 310. Specifically, inner sleeve 300 is provided with a mounting through hole into which the front end of ammonia gas pipe 200 is inserted, and the outer peripheral surface of ammonia gas pipe 200 is in contact with the inner peripheral surface of the mounting through hole, with substantially no gap. The ammonia gas pipe 200 is provided with a first ammonia gas injection hole 220, the first ammonia gas injection hole 220 is positioned at the front end of the ammonia gas pipe 200, the first ammonia gas injection hole 220 is communicated with the ammonia gas cavity 210, and the first ammonia gas injection hole 220 is communicated with the second cavity 310. The number of the first ammonia gas spraying holes 220 is plural, and the plurality of first ammonia gas spraying holes 220 are uniformly arranged along the outer circumferential surface of the ammonia gas pipe 200. In this embodiment, the first ammonia injection hole 220 is located farther rearward than the first air intake hole 330.

Wind disc 400 is provided at the front end position of inner sleeve 300, and since inner sleeve 300 and ammonia gas pipe 200 are both located in first cavity 110, wind disc 400 covers the gap between the outer circumferential surface of inner sleeve 300 and the inner circumferential surface of outer sleeve 100, and prevents air in first cavity 110 from flowing out from the opening structure of first cavity 110. It should be understood that wind turbine 400 may be fixedly connected to the outer circumferential surface of inner sleeve 300 or the inner circumferential surface of outer sleeve 100, and the connection manner may be, but is not limited to, clamping, welding, or the like. In this embodiment, wind disc 400 is integrally formed with inner sleeve 300.

Moreover, the wind disc 400 is provided with first swirl grooves 410, the first swirl grooves 410 penetrate through the front end surface and the rear end surface of the wind disc 400, the first swirl grooves 410 are communicated with the first cavity 110, the number of the first swirl grooves 410 is a plurality, and the plurality of first swirl grooves 410 are circumferentially arranged around the central hole 510. It is understood that the rotation directions of the first and second rotation grooves 410 and 520 are identical.

It will be appreciated that ammonia gas in ammonia gas conduit 200 flows into second cavity 310 of inner sleeve 300 through first ammonia gas injection holes 220, while a portion of air located in first cavity 110 of outer sleeve 100 flows into second cavity 310 through first air intake holes 330, such that the portion of air is partially premixed with ammonia gas to form premixed gas, and at this time, second cavity 310 is a mixing cavity. Because the ammonia gas is in an excessive state, the premixed gas can be subjected to rich combustion, so that the generation of nitrogen oxides can be inhibited, and the aim of low nitrogen oxide emission is fulfilled.

Because the central axis of the first air inlet hole 330 and the central axis of the first ammonia gas spraying hole 220 are perpendicular to the central axis extending forward and backward of the second cavity 310, the forward flowing speed of the ammonia gas and the air flowing into the second cavity 310 is low, the contact time of the air and the ammonia gas in the second cavity 310 is increased, the purposes of full contact and uniform mixing are achieved, and thus the premixed gas is formed.

After the premixed gas flows out of the central hole 510 and the second swirl groove 520 of the end plate 500 respectively, the premixed gas is ignited under the ignition effect, and forms a rich premixed ammonia swirling flame, in the rich premixed ammonia swirling flame, unburned ammonia can reduce nitrogen oxides generated in the combustion process, the emission of nitrogen oxides in tail gas is reduced, meanwhile, the other part of air of the first cavity 110 flows out of the first swirl groove 410 of the air disc 400, and the air flow forms a co-rotating air flow at the periphery of the rich premixed ammonia swirling flame, so that the air flow has a good stirring effect, the air and the unburned ammonia are mixed, the unburned ammonia in the rich premixed flame can be further oxidized, the pure ammonia is combusted, the ammonia can be fully utilized, the stable combustion of the ammonia can be ensured, and the aim of zero carbon emission is finally achieved.

It is to be understood that outer sleeve 100, inner sleeve 300, ammonia gas pipe 200, end plate 500 and wind tray 400 may be made of metal materials, and are not particularly limited herein.

Further, the inner sleeve 300 is provided with a second air inlet hole 320, and the second air inlet hole 320 is located at the rear end surface of the inner sleeve 300, that is, the second air inlet hole 320 penetrates through the rear end surface of the inner sleeve 300, so that the second air inlet hole 320 is respectively communicated with the first cavity 110 and the second cavity 310. The number of the second air inlet holes 320 is plural, and the plurality of second air inlet holes 320 are circumferentially arranged around the central axis of the ammonia pipe 200.

It will be appreciated that the provision of the second air intake holes 320 can increase the amount of air flowing into the second chamber 310, and the center axis of the second air intake holes 320 is perpendicular to the center axis of the first ammonia gas injection holes 220, and the second air intake holes 320 are located at the rear side of the first ammonia gas injection holes 220, so that air flowing from the second air intake holes 320 can be blown vertically to the ammonia gas flowing from the first ammonia gas injection holes 220 to perform partial mixing well and form premixed gas.

Further, the ammonia gas pipeline 200 is provided with a second ammonia gas spraying hole 230, and the second ammonia gas spraying hole 230 is located at the front end surface of the ammonia gas pipeline 200, that is, the second ammonia gas spraying hole 230 penetrates through the front end surface of the ammonia gas pipeline 200, so that the second ammonia gas spraying hole 230 is respectively communicated with the ammonia gas cavity 210 and the second cavity 310. The number of the second ammonia gas spraying holes 230 is plural, and the second ammonia gas spraying holes 230 are circumferentially arranged around the central axis of the ammonia gas pipe 200. The second ammonia injection hole 230 is located at the rear side of the first air intake hole 330.

It can be appreciated that the ammonia gas pipeline 200 is provided with the second ammonia gas spraying hole 230, which can increase the flow of the ammonia gas flowing into the second cavity 310, and the central axis of the second ammonia gas spraying hole 230 is perpendicular to the central axis of the first air inlet 330, so that the ammonia gas flowing out of the second ammonia gas spraying hole 230 can be vertically blown to the air flowing out of the first air inlet 330, and good partial mixing is performed, so as to form premixed gas.

In addition, as shown in fig. 4 to 7, the second embodiment of the present utility model provides a premixed pure ammonia combustion structure for an industrial kiln, which is different from the first embodiment in that: the outlet structure of the end plate 500 is different.

In the present embodiment, the end plate 500 is provided with a cylinder 530, the cylinder 530 being located at the front end surface of the end plate 500, both ends of the cylinder 530 extending in the front-rear direction. It will be appreciated that the barrel 530 may be removably or non-removably attached to the end plate 500. The number of the cylinder 530 is plural, and is not particularly limited herein. The cylinder 530 has a cylindrical shape.

In this embodiment, the number of the cylinders 530 is five, one cylinder 530 is set as a central cylinder, the remaining four cylinders 530 are set as peripheral cylinders, the central cylinder is located at the middle position of the end plate 500, and a plurality of peripheral cylinders are circumferentially arranged around the central axis of the central cylinder.

The cylinder 530 is hollow inside to form a first cavity 540, and the first cavity 540 penetrates through the end plate 500, so that the first cavity 540 is communicated with the second cavity 310. The cylinder 530 is provided with first air outlet holes 550, the first air outlet holes 550 are located on the outer circumferential surface of the cylinder 530, the first air outlet holes 550 are communicated with the first inner cavity 540, and the number of the first air outlet holes 550 is multiple and is circumferentially arranged around the central axis of the cylinder 530. It is understood that the first air outlet holes 550 may be provided in one group or in multiple groups, and may be spaced apart in the front-rear direction. In this embodiment, the first air outlet holes 550 are provided with two groups.

It can be appreciated that the first air outlet holes 550 on the cylinder 530 are of an air outlet structure, so that the premixed air in the second cavity 310 flows forward and is sprayed out from the first air outlet holes 550 of all the cylinders 530, and the first air outlet holes 550 are arranged on the peripheral wall surface of the cylinder 530, so that the forward flowing speed of the premixed air can be effectively reduced, the stable combustion of the ammonia gas can be promoted, and the premixed air can be sprayed out towards the radial direction of the cylinder 530, so that the premixed air can be diffused towards multiple directions.

In addition, as shown in fig. 8 to 11, the third embodiment of the present utility model provides a premixed pure ammonia combustion structure for an industrial kiln, which is different from the first embodiment in that: the outlet structure of the end plate 500 is different.

In the present embodiment, the end plate 500 is provided with a center sleeve 570, and the center sleeve 570 is provided on the front end surface of the end plate 500 and is located at the center position of the end plate 500. The center sleeve 570 is integrally formed with the end plate 500. The central sleeve 570 is cylindrical. The central sleeve 570 is hollow and defines a second interior cavity that extends through the endplate 500 such that the second interior cavity communicates with the second cavity 310.

The center sleeve 570 is provided with a plurality of second air outlet holes 580, and the plurality of second air outlet holes 580 are circumferentially arranged along the outer circumferential surface of the center sleeve 570. It is understood that the second air outlet holes 580 may be provided with a plurality of groups at intervals along the front-rear direction. In this embodiment, the second air outlet 580 is provided with three groups.

It can be appreciated that the second air outlet 580 of the central sleeve 570 has an air outlet structure, so that the premixed air in the second cavity 310 can flow out from the second air outlet 580 of the central sleeve 570, and the speed of the premixed air flowing forward is reduced because the central axis of the second air outlet 580 is perpendicular to the central axis extending forward and backward of the central sleeve 570, so that the stable combustion of the ammonia gas can be promoted.

Further, the front end of the center sleeve 570 is provided with a blunt body 600, and the blunt body 600 has a disk shape. In this embodiment, the bluff body 600 is integrally formed with the central sleeve 570. It will be appreciated that the bluff body 600 may provide a barrier to the flow of the premixed gas exiting the second gas outlet 580, causing the velocity of the premixed gas to decrease in the forward direction, thereby increasing the residence time of the premixed gas at the center sleeve 570 and thus promoting more stable combustion of the ammonia gas.

Further, the end plate 500 is provided with a plurality of first spray holes 561, and the first spray holes 561 penetrate through the front end surface and the rear end surface of the end plate 500, so that the first spray holes 561 are communicated with the second cavity 310, and the plurality of first spray holes 561 are circumferentially arranged around the central axis of the central sleeve 570. Further, the first injection holes 561 are located at the projection area of the blunt body 600 in the front-rear direction, and thus, the premixed gas flowing out from the first injection holes 561 is blocked by the blunt body 600.

It can be appreciated that a part of the premixed gas in the second cavity 310 flows out from the second air outlet 580, and another part of the premixed gas flows out from the first spray hole 561, and the central axis of the first spray hole 561 is perpendicular to the central axis of the second air outlet 580, so that the two parts of premixed gas can be further mixed; also, since the first injection holes 561 are located at the projection area of the blunt body 600 in the front-rear direction, the blunt body 600 also has a blocking effect on the premixed gas flowing out of the first injection holes 561, thereby allowing the premixed gas to stay at the center sleeve 570 for a longer time, so that the combustion stability of the ammonia gas is enhanced.

Further, the end plate 500 is provided with a plurality of second spray holes 562, and the second spray holes 562 penetrate through front and rear end surfaces of the end plate 500, so that the second spray holes 562 communicate with the second chamber 310. The plurality of second spray holes 562 are circumferentially arranged around a central axis of the central sleeve 570, and the second spray holes 562 are located between the first swirl slots 410 and the first spray holes 561.

It can be appreciated that the arrangement of the second nozzle 562 can increase the outflow area of the premixed gas in the second cavity 310, effectively reduce the flow velocity of the premixed gas flowing out from the first nozzle 561 and the second outlet 580, prolong the residence time of the premixed gas at the central sleeve 570, and help to improve the combustion stability of the ammonia gas.

It can be understood that the premixed pure ammonia combustion structure for the industrial kiln provided by the first embodiment, the second embodiment and the third embodiment can realize pure ammonia ignition and high-power stable combustion, promote the industrial kiln to realize zero carbon emission, and promote the ammonia to burn in a uniform and rich combustion mode by adopting a partially premixed combustion mode, thereby greatly reducing the generation and emission of nitrogen oxides.

While the preferred embodiments of the present utility model have been illustrated and described, the present utility model is not limited to the embodiments, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present utility model, and these are intended to be included in the scope of the present utility model as defined in the appended claims.

Claims (10)

1. A premix formula pure ammonia combustion structure for industrial kiln, characterized by includes:

the outer sleeve (100) is provided with a first cavity (110), and the front end of the first cavity (110) is of an opening structure;

the inner sleeve (300) is provided with a second cavity (310), the front end of the inner sleeve (300) is provided with an end plate (500), the end plate (500) is provided with an air outlet structure, the rear end of the inner sleeve (300) is provided with a first air inlet hole (330), the first air inlet holes (330) are provided with a plurality of air inlets and are uniformly arranged along the peripheral surface of the inner sleeve (300), and the air outlet structure and the first air inlet holes (330) are communicated with the second cavity (310);

the ammonia gas pipeline (200) extends forwards and backwards, the front end of the ammonia gas pipeline (200) penetrates through the rear end of the inner sleeve (300) and stretches into the second cavity (310), the front end of the ammonia gas pipeline (200) is provided with a first ammonia gas spray hole (220), and the first ammonia gas spray holes (220) are provided with a plurality of first ammonia gas spray holes and are uniformly arranged along the peripheral surface of the ammonia gas pipeline (200);

and the wind disc (400) is arranged at the front end of the inner sleeve (300), the wind disc (400) covers a gap between the outer circumferential surface of the inner sleeve (300) and the inner circumferential surface of the outer sleeve (100), and the wind disc (400) is provided with a first swirl groove (410) communicated with the first cavity (110).

2. The premixed pure ammonia combustion structure for an industrial kiln according to claim 1, wherein the end plate (500) is provided with a central hole (510) and a second swirl groove (520), the second swirl groove (520) is provided with a plurality of swirl grooves and circumferentially arranged around the central hole (510), and the central hole (510) and the second swirl groove (520) form the air outlet structure and are communicated with the second cavity (310).

3. The premixed pure ammonia combustion structure for an industrial kiln according to claim 1, wherein the front end surface of the end plate (500) is provided with a plurality of cylinders (530), the cylinders (530) extend forwards and backwards, the cylinders (530) are provided with first inner cavities (540), the first inner cavities (540) penetrate through the end plate (500) and are communicated with the second cavity (310), the outer circumferential surface of the cylinders (530) is provided with a plurality of first air outlet holes (550), and the first air outlet holes (550) are of an air outlet structure and are communicated with the first inner cavities (540).

4. A premixed pure ammonia combustion structure for an industrial kiln according to claim 3, wherein one of the cylinders (530) is a central cylinder, the remaining cylinders (530) are peripheral cylinders, the central cylinder is located in a middle position of the end plate (500), and a plurality of the peripheral cylinders are circumferentially arranged around the central cylinder.

5. The premixed pure ammonia combustion structure for an industrial kiln according to claim 1, wherein a central sleeve (570) is arranged on the front end face of the end plate (500), the central sleeve (570) is provided with a second inner cavity, the second inner cavity penetrates through the end plate (500) and is communicated with the second cavity (310), a plurality of second air outlet holes (580) are formed in the outer peripheral face of the central sleeve (570), and the second air outlet holes (580) are of an air outlet structure and are communicated with the second inner cavity.

6. The premixed pure ammonia combustion structure for an industrial kiln according to claim 5, characterized in that the front end of the center sleeve (570) is provided with a blunt body (600).

7. The premixed pure ammonia combustion structure for an industrial kiln according to claim 6, wherein the end plate (500) is provided with a plurality of first injection holes (561) communicating with the second cavity (310), the plurality of first injection holes (561) are circumferentially arranged around the center sleeve (570), and the first injection holes (561) are located at projection areas of the blunt body (600) in the front-rear direction.

8. The premixed pure ammonia combustion structure for an industrial kiln according to claim 7, characterized in that the end plate (500) is provided with a plurality of second injection holes (562) communicating with the second cavity (310), the plurality of second injection holes (562) being circumferentially arranged around the central sleeve (570), the second injection holes (562) being located between the first injection holes (561) and the first swirl slots (410).

9. The premixed pure ammonia combustion structure for an industrial kiln according to claim 1, wherein the inner sleeve (300) is provided with a second air inlet hole (320), the second air inlet hole (320) is located at the rear end face of the inner sleeve (300), and the second air inlet hole (320) is provided with a plurality of air inlet holes and is circumferentially arranged around the ammonia gas pipe (200).

10. The premixed pure ammonia combustion structure for an industrial kiln according to claim 1, wherein the ammonia gas pipe (200) is provided with a second ammonia gas spraying hole (230), the second ammonia gas spraying hole (230) is located at the front end face of the ammonia gas pipe (200), and the second ammonia gas spraying hole (230) is provided with a plurality of second ammonia gas spraying holes and circumferentially arranged around the ammonia gas pipe (200).

Images