WO2018133292A1 - Nozzle with adjustable inner and outer flow channel equivalence ratios, nozzle array, and burner - Google Patents

Abstract

A nozzle with adjustable inner and outer flow channel equivalence ratios comprises a central cylinder (6), an outer-wall cylinder (3), and a wave swirler (5). The wave swirler (5) is coaxially disposed in the outer-wall cylinder (3). The central cylinder (6) is inserted into the wave swirler (5) along the axial direction of the wave swirler (5) and through an outlet end of the wave swirler (5). The wave swirler (5) is divided into an inner-ring swirling structure (13) and an outer-ring swirling structure (14). The outer-ring swirling structure (14), the central cylinder (6), and the outer-wall cylinder (3) define an outer flow channel. The inner-ring swirling structure (13) and the central cylinder (6) define an inner flow channel. The part of the central cylinder (6) embedded in the wave swirler (5) is an embedded section. The embedded section has a non-cylindrical structure and is used to adjust an equivalence ratio of the inner and outer flow channels. The embedded section adjusts the equivalence ratio of the inner and outer flow channels, thereby reducing flame propagation speed, avoiding backfiring in the central area of an outlet of a nozzle, and increasing a nozzle backfiring margin.

Description

Nozzle, nozzle array and burner with adjustable inner and outer flow channel equivalent ratio Technical field

The present disclosure relates to the field of combustion device technology, and more particularly to a nozzle, a nozzle array and a burner with adjustable internal and external flow passage equivalent ratios, which are particularly suitable for various industrial burners such as gas turbines, boilers, and chemical furnaces.

Background technique

Industrial production, such as smelting, petrochemical, pharmaceutical, paper, and mining industries, produces large amounts of harmful gases and low calorific value gases. Direct emissions into the atmosphere can seriously pollute the environment and waste energy. If these gases are burned and utilized, environmental pollution and energy conservation can be reduced. At present, China's environmental pollution problem is very serious, and the development of related clean combustion technologies is very urgent. In addition, aerostats, gas turbines for power generation, and gas turbines for ships also require a burner. Burner manufacturers have developed a variety of clean combustion technologies, such as lean premixed combustion technology, dilute phase premixed pre-evaporation technology, lean oil direct injection technology, etc., although these technologies can effectively reduce pollutant emissions, they are not burning. Stable problem.

The equivalence ratio is an important parameter of the nozzle and the burner, which has an important influence on the combustion performance. Different equivalence ratios are directly related to combustion stability and pollutant discharge. The equivalence ratio needs to be adjusted for different working conditions in order to improve combustion. performance. Therefore, there is a need in the art to develop a burner having an adjustable internal and external flow passage equivalent ratio.

Summary of the invention

The present disclosure provides a nozzle having an adjustable internal and external flow passage equivalent ratio, comprising: an intermediate cylinder, an outer wall cylinder and a wave cyclone; wherein the wave cyclone is coaxially disposed in the outer wall cylinder; The intermediate cylinder is embedded in the wave cyclone in the axial direction of the wave cyclone by the outlet end of the wave cyclone, and the wave cyclone is divided into an inner ring swirling structure and an outer ring a swirling structure; the outer ring swirling structure, the intermediate cylinder and the outer wall cylinder enclose an outer flow passage, the inner ring swirling structure and the intermediate cylinder enclosing an inner flow passage; the intermediate cylinder is embedded with a wave swirling flow The portion of the device is an embedded segment that is a non-cylindrical structure to adjust the equivalence ratio of the inner flow passage and the outer flow passage.

In some embodiments of the present disclosure, the wave cyclone is formed by circumferentially arranging a plurality of peaks and a plurality of valleys undulating in a radial direction; the embedded section is a toothed structure, the toothed structure A plurality of strip-shaped sheets arranged in a circumferential direction are formed, and grooves are formed between adjacent strip-shaped sheets.

In some embodiments of the present disclosure, the groove corresponds to the trough position, the strip piece corresponds to the peak position; or the groove corresponds to the peak position, the strip piece Corresponding to the trough position.

In some embodiments of the present disclosure, the strip is provided with a through hole.

In some embodiments of the present disclosure, the strips and grooves are elongated, sinusoidal, square, triangular or polygonal.

In some embodiments of the present disclosure, the wave cyclone is formed by circumferentially arranging a plurality of peaks and a plurality of valleys undulating in a radial direction; the embedded section is a wave structure, and the wave structure is A plurality of peaks and a plurality of troughs of radial undulations are arranged circumferentially.

In some embodiments of the present disclosure, the trough of the embedded segment corresponds to a peak position of the wave cyclone, the peak of the embedded segment corresponds to a trough position of the wave cyclone; or the trough of the embedded segment The valley position of the wave cyclone corresponds to the peak of the embedded segment corresponding to the peak position of the wave cyclone.

In some embodiments of the present disclosure, the crests and troughs of the wave structure are open with through holes.

In some embodiments of the present disclosure, the cross-sectional profile of the wave structure is a sinusoidal waveform, a square waveform, a triangular waveform, or a polygonal waveform.

In some embodiments of the present disclosure, some or all of the inner ring swirling structure is trimmed in the axial direction, and the upstream section of the wave swirler forms a cavity.

In some embodiments of the present disclosure, a mesh plate is further included, the mesh plate is disposed in the intermediate cylinder, and an inner blending zone is formed between the outlet end of the wave cyclone, and the inner blending zone The inner flow path is connected.

In some embodiments of the present disclosure, the outer wall cylinder protrudes in the downstream direction from the intermediate cylinder, and the outer wall cylinder, the outlet end of the wave cyclone and the intermediate cylinder enclose an outer mixing zone, the outer The blending zone is in communication with the outer flow channel, the portion of the outer wall cylinder projecting from the intermediate cylinder forming an outlet blending zone.

In some embodiments of the present disclosure, the through holes are circular, elliptical, triangular, or polygonal.

In some embodiments of the present disclosure, the intermediate cylinder is embedded in the wave swirler to a depth that is half the diameter of the outer wall cylinder.

The present disclosure also provides an array of nozzles comprising a plurality of the above-described nozzles, the array of nozzles being a circular array or a rectangular array.

The present disclosure also provides a burner comprising the above described nozzle or array of nozzles.

It can be seen from the above technical solution that the inner and outer flow passage equivalent ratio of the nozzle, the nozzle array and the burner are adjustable, and the embedded section of the middle cylinder embedded in the wave cyclone is a wave structure or a tooth structure, and the embedded section can also be Opening a through hole can adjust the equivalence ratio of the inner flow channel and the outer flow channel, reduce the flame propagation speed, avoid tempering in the middle portion of the nozzle outlet, and widen the tempering margin of the nozzle.

DRAWINGS

The drawings are intended to provide a further understanding of the disclosure, and are in the In the drawing:

1 is a half cross-sectional view of a nozzle having an adjustable internal and external flow passage equivalent ratio according to a first embodiment of the present disclosure;

Figure 2 is a plan view of the nozzle shown in Figure 1;

Figure 3 is a three-dimensional view of the nozzle shown in Figure 1 with the outer wall cylinder omitted;

Figure 4 is a schematic view of the intermediate cylinder of the nozzle of Figure 1;

Figure 5 is a schematic view showing a combined structure of the intermediate cylinder and the wave cyclone shown in Figure 4;

Figure 6 is a schematic view showing another combined structure of the intermediate cylinder and the wave cyclone shown in Figure 4;

Figure 7 is a schematic view showing the size of the nozzle shown in Figure 1;

Figure 8 is a schematic view showing the axial dimension of the nozzle shown in Figure 1;

Figure 9 is a schematic view of an intermediate cylinder of a nozzle according to a second embodiment of the present disclosure;

Figure 10 is a sectional view of Figure 9 along the axial position;

Figure 11 is a schematic view showing a combined structure of the intermediate cylinder and the wave cyclone shown in Figure 9;

Figure 12 is a schematic view showing another combined structure of the intermediate cylinder and the wave cyclone shown in Figure 9;

Figure 13 is a schematic view of an intermediate cylinder of a third embodiment of the present disclosure;

Figure 14 is a schematic view of an intermediate cylinder of a fourth embodiment of the present disclosure.

【Symbol Description】

1- intermediate cylinder inlet; 2-outer wall cylinder inlet; 3-outer wall cylinder; 4-support cylinder; 5-wave cyclone; 51-peak; 52-valley; 6-intermediate cylinder; Blending zone; 8-mesh plate; 9-outer blending zone; 10-internal cylinder exit zone; 11-outlet blending zone; 12-nozzle outlet; 13-inner ring swirling structure; 14-outer ring rotation Flow structure; 15-wave structure; 151-peak; 152-valley; 16-bar; 17-groove; 18-through hole;

A-outer wall cylinder diameter; B-intermediate cylinder diameter; C-wave cyclone inscribed circle diameter; D- The depth of the intermediate cylinder embedded in the wave cyclone; the thickness of the E-mesh plate; the height of the F-inner blending zone; the height of the G-intermediate cylinder exit zone; and the height of the H-outlet blending zone.

detailed description

The present disclosure will be further described in detail below with reference to the specific embodiments thereof and the accompanying drawings.

The technical solutions in the embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present disclosure. It is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.

Referring to FIG. 1 to FIG. 3, a first embodiment of the present disclosure provides a nozzle having an adjustable internal and external flow passage equivalent ratio, comprising: an intermediate cylinder 6, an outer wall cylinder 3, a mesh plate 8, and a wave swirling structure. The wave swirling structure is located in the outer wall cylinder 3 and is disposed coaxially with the outer wall cylinder 3; the wave swirling structure comprises a wave swirler 5 and a support cylinder 4, and the wave swirler 5 is surrounded by a plurality of peaks undulating in the radial direction 51 and a plurality of troughs 52 are arranged in the circumferential direction, and the circumferentially arranged troughs 52 enclose an inscribed circle, and an inscribed circular space is formed in the center of the wave cyclone 5, and the circumferentially arranged peaks 51 are formed outside. Cut the circle. The wave cyclone 5 is transiently connected to the support cylinder 4 from the downstream to the upstream direction. The intermediate cylinder 6 is inserted into the wave swirler 5 in the axial direction of the wave cyclone 5 from the outlet end of the wave swirler 5, the diameter of the intermediate cylinder 6 being between the diameter of the inscribed circle and the diameter of the circumscribed circle, which will The wave cyclone 5 is divided into two parts: an inner ring swirling structure 13 and an outer ring swirling structure 14, and the outer ring swirling structure 14, the intermediate cylinder 6 and the outer wall cylinder 3 enclose an outer flow passage, and the inner ring swirling structure 13 The inner cylinder 6 is surrounded by the inner cylinder. The mesh plate 8 is disposed in the intermediate cylinder 6, and the inner mixing zone 7 is formed between the mesh plate 8 and the outlet end of the wave cyclone 5, and the inner mixing zone 7 is in communication with the inner flow passage, and the outer wall cylinder 3 is along The downstream direction protrudes from the intermediate cylinder 6, and the outer wall cylinder 3, the outlet end of the wave cyclone 5 and the intermediate cylinder 6 enclose an outer mixing zone 9, the outer mixing zone 9 communicates with the outer flow channel, and the outer wall cylinder 3 protrudes. An outlet blending zone 11 is formed in a portion of the intermediate cylinder 6.

In the nozzle of this embodiment, the fuel and air are not blended before entering the nozzle, and the intermediate cylinder inlet 1 may be a fuel inlet or an air inlet. Similarly, the outer cylinder inlet 2 may also be a fuel inlet or an air inlet. In order to achieve combustion, fuel and air must be blended together. In this embodiment, there are three mixing zones, namely an inner blending zone 7, an outer blending zone 9, and an outlet blending zone 11. Take For example, the fuel is introduced into the intermediate cylinder inlet 1 and the inlet of the outer cylinder inlet 2 is taken as an example. The fuel enters the nozzle from the intermediate cylinder inlet 1 and enters the wave cyclone 5 through the support cylinder 4, and a part of the fuel flows into the inner flow passage. Part of the fuel flows into the outer flow passage, the air enters the nozzle from the outer wall cylinder inlet 2, part of the air flows into the inner flow passage, part of the air flows into the outer flow passage, and the fuel and air flowing into the inner flow passage enter the inner mixing zone 7 to be blended into a swirling combustible mixture. The fuel and air flowing into the outer flow passage enter the outer mixing zone 9 to be blended into a swirling combustible mixture, and the mesh plate 8 serves as a filtering action. After the spinning mixture of the inner blending zone 7 passes through the mesh plate 8, the rotation thereof The motion is filtered to become a spin-free combustible mixture. After the non-rotating combustible mixture flows out through the intermediate cylinder outlet zone 10, it is blended with the swirling combustible mixture flowing out of the outer mixing zone 9 in the outlet blending zone 11 and exited by the nozzle. 12 sprayed out to burn. In the present disclosure, since the combustible mixture of the outer blending zone 9 has a rotary motion, the combustible mixer forms an expanding flame at the nozzle outlet 12 under the action of centrifugal force, thereby improving the stability of combustion, and the intermediate cylinder outlet region 10 flows out. The combustible material is a non-rotating axial movement, which prevents a strong recirculation zone from being formed at the nozzle outlet, reduces flow loss, and reduces pollutant emission. Therefore, the nozzle of the present disclosure has both good combustion stability and low pollutant emission. . When air is introduced into the intermediate cylinder inlet 1 and the outer wall cylinder inlet 2 is filled with fuel, the operation of the nozzle is similar to the above process, and will not be described herein.

Figure 4 shows the specific structure of the intermediate cylinder 6 of the nozzle of Figures 1 to 3. The portion of the intermediate cylinder 6 embedded in the wave cyclone 5 is an embedded section. In this embodiment, referring to FIG. 4, the embedded section is a toothed structure including a plurality of strips 16 arranged in the circumferential direction. A groove 17 is formed between adjacent strips 16. The embedded section of the tooth structure can adjust the equivalence ratio of the inner and outer flow channels, and at the same time reduce the nozzle weight and reduce the flow friction loss.

Referring to Figure 5, for the sake of clarity, only two cycles of the wave cyclone are shown. The groove 17 of the tooth structure corresponds to the position of the trough 52 of the wave cyclone, i.e. the groove 17 is located in the trough 52 of the wave cyclone. The strip-shaped strip 16 of the toothed structure corresponds to the position of the crest 51 of the wave cyclone, i.e. the strip piece 16 is located within the crest 51 of the wave cyclone. When the intermediate cylinder inlet 1 is the fuel inlet and the outer cylinder inlet 2 is the air inlet, the groove 17 increases the air flow rate into the inner flow passage and the equivalent ratio of the inner flow passage mixture as compared with the straight cylindrical embedded portion. Decrease, the equivalence ratio of the outer runner mixture increases.

Referring to Figure 6, only two cycles of the wave cyclone are shown for clarity of view, the groove 17 of the tooth structure corresponds to the position of the peak 51 of the wave cyclone, that is, the groove 17 is located in the wave swirl Within the crests 51 of the device; the strips 16 of the toothed structure correspond to the locations of the troughs 52 of the wave cyclone, i.e., the strips 16 are located within the troughs 52 of the wave cyclone. When the intermediate cylinder inlet 1 is an air inlet and the outer wall cylinder inlet 2 is a fuel inlet, the groove 17 increases the fuel flow rate into the outer flow passage and increases the equivalence ratio of the outer flow passage mixture as compared with the straight cylindrical embedded portion. The equivalent ratio of the inner flow path is reduced.

Since the nozzle is tempered, it is mostly triggered from the middle area of the nozzle outlet. If the equivalent ratio of the mixture in the middle area is small, the flame propagation speed is low, and tempering can be avoided in the middle portion of the nozzle outlet, so that the nozzle and its burner can be widened. The tempering margin, the embedding section of the above-mentioned tooth structure can reduce the equivalence ratio of the inner flow passage, thereby reducing the flame propagation speed and avoiding tempering in the middle portion of the nozzle outlet, thereby widening the tempering margin of the nozzle.

The strips 16 are elongated in shape, and the grooves 17 are also elongated, and the strips 16 and grooves 17 may also be sinusoidal, square, triangular, polygonal, preferably square.

The cross-sectional profile of the inlet end of the swirling waver may be a circular or polygonal ring shape, preferably a circular shape; the cross-sectional profile of the outlet end of the swirling wave device may be a sinusoidal waveform, a square waveform, a triangular waveform, and a square with a rounded chamfer. Waveform; the guide line of the swirling waver is a straight line or a curve. The inner flow channel and the outer flow channel are oblique flow channels, and fuel and air are respectively on both sides of the wave cyclone, and a circular rotation motion is generated under the action of the oblique flow channel, and the fuel and air are mixed at the outlet of the wave cyclone Mixed. Preferably, in the case where the direction of rotation of the diagonal flow channel is counterclockwise, the angle between the oblique flow channel and the axial direction ranges from -90° to 0°, preferably from -30° to -60°; or the direction of rotation of the diagonal flow channel In the case of clockwise rotation, the angle between the oblique flow passage and the axial direction ranges from 0 to 90, preferably from 30 to 60.

In this embodiment, referring to FIG. 7, the diameter of the outer wall cylinder is A, the diameter of the intermediate cylinder is B, the diameter of the inscribed circle of the wave cyclone 5 is C, and A>B>C, preferably B=(A +C)/2. The cross-sectional profile of the intermediate cylinder 6 may be circular, triangular, polygonal, preferably circular.

Referring to Figure 8, the intermediate cylinder 6 is embedded in the wave cyclone 5 to a depth D of 1 mm to 1000 mm, preferably D = A/2; the mesh plate thickness E is 1 mm to 1000 mm, preferably E = 5 mm; the inner blending zone The height F is from 1 mm to 1000 mm, preferably F=A/2; the height G of the intermediate cylinder outlet region is from 1 mm to 1000 mm, preferably G=A/2; the height of the outlet blending zone H is from 1 mm to 1000 mm, preferably H is between 1.5 A. Between ~3A.

The ratio of the opening area of the mesh plate to the area of the mesh plate is 0-100%, that is to say the mesh plate 8 The hole and the air can be mixed only through the outer flow channel. At this time, the ratio of the opening area of the mesh plate to the area of the mesh plate is 0; the mesh plate 8 can be completely opened, which is equivalent to not setting the mesh plate. Thus, the combustible mixture of the intermediate cylinder outlet zone 10 is also a flammable mixing zone with a spin, and the ratio of the open area of the mesh plate to the area of the mesh plate is 100%. Preferably, the ratio of the area of the opening on the mesh plate to the area of the mesh plate is 40% to 80%. The diameter of the holes in the mesh plate is 0.1-10 mm, and the sizes of the holes may be the same or different; the shape of the holes may be circular, elliptical, triangular, polygonal or a combination of these shapes.

In the nozzle of the second embodiment of the present disclosure, for the purpose of brief description, any of the technical features of the above-described first embodiment that can be used for the same application will be described herein, and the same description will not be repeated.

In this embodiment, referring to Figs. 9 and 10, the embedded section is a wave structure 15 which is formed by circumferentially arranging a plurality of peaks 151 and a plurality of valleys 152 which are undulating in the radial direction. The embedding section of the wave structure can also adjust the equivalence ratio of the inner and outer flow channels.

Referring to Figure 11, the valley 152 of the embedded segment corresponds to the position of the peak 51 of the wave cyclone, i.e., the valley 152 of the embedded segment is embedded in the peak 51 of the wave cyclone, and the peak 151 of the embedded segment and the valley of the wave cyclone 52 The position corresponds to the fact that the peak 151 of the embedded section is embedded in the trough 52 of the wave cyclone. When the intermediate cylinder inlet 1 is the fuel inlet and the outer cylinder inlet 2 is the air inlet, the wave structure embedded section in FIG. 11 reduces the fuel flow into the inner flow passage and increases the air flow rate as compared with the straight cylindrical embedded portion. Therefore, the equivalence ratio of the inner flow passage is decreased, the fuel flow rate entering the outer flow passage is increased, and the air flow rate is decreased, thereby increasing the equivalence ratio of the outer flow passage, thereby reducing the flame propagation speed and avoiding tempering in the middle portion of the nozzle outlet. Widen the tempering margin of the nozzle.

Referring to Fig. 12, which is opposite to the structure of Fig. 11, the valleys 152 of the embedded segments correspond to the locations of the valleys 52 of the wave cyclone, i.e., the valleys 152 of the embedded segments are embedded in the valleys 52 of the wave cyclone, and the peaks 151 of the embedded segments are The position of the peak 51 of the wave cyclone corresponds to that the peak 151 of the embedded section is embedded in the peak 51 of the wave cyclone. When the intermediate cylinder inlet 1 is an air inlet and the outer wall cylinder inlet 2 is a fuel inlet, the wave structure embedded section in FIG. 12 reduces the fuel flow into the inner flow passage and increases the air flow rate as compared with the straight cylindrical embedded portion. Therefore, the internal flow passage equivalent ratio is decreased; the fuel flow rate entering the outer flow passage is increased, and the air flow rate is decreased, thereby increasing the equivalence ratio of the outer flow passage, thereby reducing the flame propagation speed and avoiding tempering in the middle portion of the nozzle outlet. Widen the tempering margin of the nozzle.

The embedded section wave structure cross-sectional profile can be sinusoidal waveform, square waveform, triangular waveform, multilateral The waveform or a combination thereof is preferably a sinusoidal waveform.

In the nozzle of the third embodiment of the present disclosure, for the purpose of brief description, any of the above-described embodiments can be used for the same application, and the same description is not required.

In this embodiment, referring to Fig. 13, the strip-shaped piece 16 of the tooth structure has a through hole 18, and the shape of the through hole 18 may be circular, elliptical, triangular, polygonal, preferably circular, and the diameter is 0.1 mm. 100mm. Referring to Figure 13, only one cycle of the wave cyclone is shown for clarity of view, and a row of circular holes is formed in the strips located in the wave swirler troughs. By adjusting the area of the through hole, the equivalent ratio of the combustible mixture of the inner and outer flow passages is adjusted to widen the tempering margin of the nozzle.

In this embodiment, a through hole may be formed in the peak 151 and the trough 152 of the embedded portion of the wave structure. Similar to the above case, by adjusting the area of the through hole, the equivalent ratio of the combustible mixture of the inner and outer flow channels can also be adjusted. Widen the tempering margin of the nozzle.

The nozzle of the fourth embodiment of the present disclosure, for the purpose of brief description, any of the above-described embodiments can be used for the same application, and the same description is not required.

In this embodiment, a portion of the structure of the inner ring swirling structure 13 located in the intermediate cylinder 6 is trimmed in the axial direction, and the upstream portion of the wave swirler 5 forms a cavity, the bottom of which is meshed with the mesh plate. The inner blending zone is formed to reduce the nozzle weight and reduce the flow friction loss. The height of the trimmed portion of the structure is between 0 and 100% D. After trimming, the position of the mesh plate is also adjusted accordingly so that the height F of the inner blending zone is 1 mm to 1000 mm, preferably F=A/2.

Referring to FIG. 14, in the embodiment, the inner ring swirling structure 13 can be completely trimmed, and the swirling wave structure only includes the outer ring swirling structure 14, and the upstream section of the wave swirler is divided into a cavity, which is empty. An inner blending zone is formed between the bottom of the cavity and the mesh plate, which further reduces nozzle weight and reduces flow friction losses. After trimming, the position of the mesh plate is also adjusted accordingly so that the height F of the inner blending zone is 1 mm to 1000 mm, preferably F=A/2.

A fifth embodiment of the present disclosure provides a nozzle array comprising a plurality of nozzles according to any of the above embodiments. Wherein, the nozzle array is a circular array, and the circular array comprises a P-circle nozzle, and each nozzle comprises Q nozzles, wherein 1≤P, Q≤100.

Wherein the nozzle array is a rectangular array comprising P rows of nozzles, each row of nozzles comprising Q nozzles, wherein 1≤P, Q≤100.

A sixth embodiment of the present disclosure provides a burner comprising the nozzle according to any one of the above first to fourth embodiments, or the multi-nozzle nozzle array of the fifth embodiment.

Heretofore, the present embodiment has been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the present disclosure.

The above is a preferred embodiment of the present disclosure, and it should be noted that the preferred embodiment is only for understanding the present disclosure, and is not intended to limit the scope of the disclosure. Moreover, the features in the preferred embodiment are applicable to both the method embodiment and the device embodiment, unless otherwise specified, and the technical features appearing in the same or different embodiments may not conflict with each other. Used in combination.

It should be noted that the above definitions of the various components are not limited to the specific structures or shapes mentioned in the embodiments, and those skilled in the art can simply and well replace them, and the specific embodiments described above The detailed description of the present disclosure, the technical solutions and the advantages of the present invention are intended to be illustrative only, and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present disclosure are intended to be included within the scope of the present disclosure.

Claims (16)

A nozzle having an adjustable ratio of inner and outer flow passages, comprising: an intermediate cylinder, an outer wall cylinder and a wave cyclone; wherein The wave cyclone is coaxially disposed in the outer wall cylinder; The intermediate cylinder is embedded in the wave cyclone in the axial direction of the wave cyclone by the outlet end of the wave cyclone, and the wave cyclone is divided into an inner ring swirling structure and an outer ring Swirling structure The outer ring swirling structure, the intermediate cylinder and the outer wall cylinder enclose an outer flow passage, and the inner ring swirling structure and the intermediate cylinder enclose an inner flow passage; The portion of the intermediate cylinder embedded in the wave cyclone is an embedded section, which is a non-cylindrical structure to adjust the equivalence ratio of the inner flow passage and the outer flow passage. A nozzle according to claim 1, wherein said wave cyclone is formed by circumferentially arranging a plurality of peaks and a plurality of troughs undulating in the radial direction; The embedded section is a toothed structure, and the toothed structure includes a plurality of strip-shaped sheets arranged in a circumferential direction, and grooves are formed between adjacent strip-shaped sheets. A nozzle according to claim 2, said groove corresponding to said trough position, said strip piece corresponding to said peak position; or said groove corresponding to said peak position, said strip piece Corresponding to the trough position. The nozzle according to claim 2, wherein said strip piece is provided with a through hole. The nozzle of claim 2, said strips and grooves being elongated, sinusoidal, square, triangular or polygonal. A nozzle according to claim 1, wherein said wave cyclone is formed by circumferentially arranging a plurality of peaks and a plurality of troughs undulating in the radial direction; The embedded section is a wave structure formed by circumferentially arranging a plurality of peaks and a plurality of valleys undulating in the radial direction. A nozzle according to claim 6, wherein the trough of the embedded section corresponds to a peak position of the wave cyclone, the peak of the embedded section corresponds to a trough position of the wave cyclone; or the trough of the embedded section The valley position of the wave cyclone corresponds to the peak of the embedded segment corresponding to the peak position of the wave cyclone. The nozzle of claim 6 wherein the crests and troughs of the wave structure are open with through holes. The nozzle of claim 6 wherein the cross-sectional profile of the wave structure is a sinusoidal waveform, a square waveform, a triangular waveform, or a polygonal waveform. The nozzle of claim 1 wherein some or all of said inner ring swirling structure is trimmed in the axial direction, and an upstream section of said wave swirler forms a cavity. The nozzle of claim 1 further comprising a mesh plate disposed in the intermediate cylinder to form an inner blending zone with the outlet end of the wave swirler, the inner blending zone and The inner flow path is connected. The nozzle according to claim 1, wherein the outer wall cylinder protrudes in the downstream direction from the intermediate cylinder, and the outer wall cylinder, the outlet end of the wave cyclone and the intermediate cylinder enclose an outer mixing zone, the outer cylinder The blending zone is in communication with the outer flow channel, the portion of the outer wall cylinder projecting from the intermediate cylinder forming an outlet blending zone. The nozzle according to claim 4 or 8, wherein the through hole is circular, elliptical, triangular or polygonal. The nozzle of claim 1 wherein said intermediate cylinder is embedded in the wave swirler to a depth that is half the diameter of the outer wall cylinder. An array of nozzles comprising a plurality of nozzles according to any one of claims 1 to 14, the array of nozzles being in the form of a circular array or a rectangular array. A burner comprising the nozzle of any of claims 1-14, or the nozzle array of claim 15.

Images