CN113483359B - Nozzle head for gas turbine and nozzle for gas turbine - Google Patents
Nozzle head for gas turbine and nozzle for gas turbine Download PDFInfo
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- CN113483359B CN113483359B CN202110825698.0A CN202110825698A CN113483359B CN 113483359 B CN113483359 B CN 113483359B CN 202110825698 A CN202110825698 A CN 202110825698A CN 113483359 B CN113483359 B CN 113483359B
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- premixing
- gas turbine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention provides a nozzle head for a gas turbine and a nozzle for the gas turbine, wherein the nozzle head for the gas turbine comprises a body, the body comprises an input section, a premixing section and an output section which are connected along the axial direction of the body, the input section is provided with an air conveying channel and a fuel conveying channel, the premixing section is provided with a first fuel conveying cavity communicated with the fuel conveying channel and a premixing channel communicated with the air conveying channel, the first fuel conveying cavity is adjacent to the side wall surface of the premixing section, the first fuel conveying cavity is communicated with the premixing channel, and the output section is provided with an ejection hole communicated with the premixing channel. The nozzle head for the gas turbine has the advantages of being high in flame stabilizing capacity and capable of cooling the body.
Description
Technical Field
The invention relates to the technical field of gas turbines, in particular to a nozzle head for a gas turbine and a nozzle for the gas turbine.
Background
While dun body flame stabilization is a good way to stabilize the flame during development of a gas turbine Dry Low NOx (DLN) combustion system, excessive introduction of purge air to cool the combustor nozzle tip reduces the stability of the nozzle tip (i.e., dun body flame stabilization), among several aspects of contamination, flame stability, dynamic pressure characteristics, and cooling techniques. However, if the amount of the introduced clean air is small, the influence on the flame stabilizing capability of the nozzle head is not great, but the cooling protection on the nozzle head is not enough, so that the nozzle head is easily damaged.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides a nozzle head for a gas turbine, which has the advantages of strong flame stabilizing capability and capability of cooling the body.
The embodiment of the invention also provides a nozzle for the gas turbine.
The nozzle head for the gas turbine comprises a body, the body comprises an input section, a premixing section and an output section which are connected along the axial direction of the body, the input section is provided with an air conveying channel and a fuel conveying channel, the premixing section is provided with a first fuel conveying cavity communicated with the fuel conveying channel and a premixing channel communicated with the air conveying channel, the first fuel conveying cavity is adjacent to the side wall surface of the premixing section, the first fuel conveying cavity is communicated with the premixing channel, and the output section is provided with an ejection hole communicated with the premixing channel.
According to the nozzle head for the gas turbine, fuel firstly passes through the first fuel conveying cavity adjacent to the side wall surface of the premixing section and then enters the premixing channel to be mixed with air, so that premixed fuel and air mixture can be provided downstream of the flameholding structure, and the flameholding capacity of the flameholding structure of the gas turbine is further enhanced. In addition, the fuel passing through the first fuel conveying cavity can take away the heat near the side wall surface of the premixing section, so that the temperature of the side wall surface of the body is reduced, the risk of tempering high temperature at the body is reduced, the nozzle head is cooled, and the body is effectively prevented from being damaged.
In some embodiments, the first fuel delivery chamber is an annular chamber.
In some embodiments, the premixing section has a second fuel delivery cavity disposed coaxially with the annular cavity, a plurality of premixing tubes disposed within the second fuel delivery cavity and spaced apart from each other, each of the plurality of premixing tubes forming the premixing passage, the first fuel delivery cavity communicating with the premixing passage through the second fuel delivery cavity.
In some embodiments, a first passage is provided at an end of the premixing section near the output section to communicate the annular chamber and the second fuel delivery chamber, and a second passage is provided at each of the plurality of premixing tubes to communicate the second fuel delivery chamber and the premixing passage.
In some embodiments, heat fins are disposed within the first fuel delivery chamber.
In some embodiments, the spouting hole is a straight hole, and an axial direction of the spouting hole coincides with an axial direction of the body.
In some embodiments, the ejection holes are multiple, and on a projection plane parallel to the cross section of the body, projections of the ejection holes are uniformly distributed on a projection of the output section.
In some embodiments, the input section has a second receiving chamber in communication with the premix passage, the fuel delivery passage being located within the second receiving chamber, the second receiving chamber forming the air delivery passage.
In some embodiments, a main pipeline and a plurality of branch pipelines are arranged in the second accommodating cavity, the main pipeline and the branch pipelines form the fuel conveying channel, the axial direction of the main pipeline is consistent with the axial direction of the body, a first end of each of the branch pipelines is connected with the main pipeline, a second end of each of the branch pipelines is communicated with the first fuel conveying cavity, and the branch pipelines are distributed at intervals along the circumferential direction of the body.
The nozzle for the gas turbine comprises a central body, and the head part of the central body forms the nozzle head for the gas turbine according to any one embodiment of the invention.
Technical advantages of the nozzle for a gas turbine according to an embodiment of the present invention are the same as those of the nozzle head for a gas turbine described above, and will not be described herein again.
The nozzle for the gas turbine comprises a center body and the nozzle head for the gas turbine, wherein the nozzle head for the gas turbine is detachably connected with the head part of the center body.
According to the nozzle for the gas turbine, the nozzle head for the gas turbine is detachably connected with the nozzle head for the gas turbine through the arrangement of the central body, so that the nozzle head for the gas turbine is convenient to maintain and replace, and the manufacturing and maintenance cost of the nozzle for the gas turbine is low.
Other technical advantages of the nozzle for a gas turbine according to embodiments of the present invention are the same as those of the nozzle head for a gas turbine described above, and will not be described herein again.
Drawings
Fig. 1 is a left side view of a nozzle tip for a gas turbine in accordance with an embodiment of the present invention.
Fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A ofbase:Sub>A nozzle tip forbase:Sub>A gas turbine according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view B-B of a nozzle tip for a gas turbine according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view C-C of a nozzle tip for a gas turbine according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view D-D of a nozzle tip for a gas turbine in accordance with an embodiment of the present invention.
Reference numerals:
a nozzle tip 100 for a gas turbine is provided,
the fuel premixing device comprises a body 1, an input section 11, an air conveying channel 111, a fuel conveying channel 112, a second accommodating cavity 113, a main pipeline 114, a branch pipeline 115, a premixing section 12, a first fuel conveying cavity 121, a premixing channel 123, a second fuel conveying cavity 124, a premixing pipe 125, a first channel 126, a second channel 127, an output section 13 and an ejection hole 131.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
A nozzle tip 100 for a gas turbine according to an embodiment of the invention is described below with reference to fig. 1-5.
As shown in fig. 1 to 5, a nozzle head 100 for a gas turbine according to an embodiment of the present invention includes a body 1, and the body 1 includes an input section 11, a premixing section 12, and an output section 13 connected along an axial direction thereof. The input section 11 is provided with an air delivery passage 111 and a fuel delivery passage 112, the premixing section 12 is provided with a first fuel delivery chamber 121 communicating with the fuel delivery passage 112 and a premixing passage 123 communicating with the air delivery passage 111, the first fuel delivery chamber 121 is adjacent to a side wall surface of the premixing section 12, the first fuel delivery chamber 121 communicates with the premixing passage 123, and the output section 13 is provided with a spouting hole 131 communicating with the premixing passage 123.
Specifically, the temperature of the fuel is normal temperature, the fuel enters the first fuel delivery chamber 121 through the fuel delivery passage 112, the air enters the premixing passage 123 from the air delivery passage 111, the fuel enters the premixing passage 123 from the first fuel delivery chamber 121 to be mixed with the air, and finally, the premixed fuel and air mixture is ejected through the ejection holes 131.
According to the nozzle head 100 for the gas turbine of the embodiment of the present invention, by arranging that the fuel first passes through the first fuel delivery chamber 121 adjacent to the side wall surface of the premixing section 12, and then re-enters the premixing passage 123 to mix with air so that a premixed fuel, air mixture can be provided downstream of the flameholding structure of the ebony, to further enhance the flameholding capability of the flameholding structure of the ebony. Moreover, the fuel passing through the first fuel delivery cavity 121 can take away the heat near the side wall surface of the premixing section 12, so that the temperature of the side wall surface of the body 1 is reduced, the risk of tempering high temperature at the body 1 is reduced, the cooling of the nozzle head is realized, and the damage to the body 1 is effectively avoided.
In some embodiments, the first fuel delivery cavity 121 is an annular cavity. The axis of the annular cavity is substantially coincident with the axis of the body 1, so that the fuel passing through the first fuel delivery cavity 121 can take away heat from each position of the side wall surface of the premixing section 12, the temperature uniformity of each position of the side wall surface of the body 1 is ensured, and the risk of high tempering temperature at the body 1 is further reduced.
In some embodiments, premix section 12 has a second fuel delivery cavity 124 disposed coaxially with the annular cavity, a plurality of premix tubes 125 disposed within second fuel delivery cavity 124 and spaced apart from one another, each of the plurality of premix tubes 125 defining a premix passage 123, and first fuel delivery cavity 121 communicating with premix passage 123 through second fuel delivery cavity 124.
Specifically, as shown in fig. 2, 3 and 5, the axial direction of the plurality of premix tubes 125 coincides with the axial direction of the body 1, the premix passage 123 formed by each premix tube 125 communicates the air delivery passage 111 with the spouting holes 131, and the air in the air delivery passage 111 directly enters the premix passage 123 in the premix tube 125. The fuel in the first fuel delivery chamber 121 enters the second fuel delivery chamber 124 and then enters the plurality of premixing passages 123, so that the consistency of the mixing ratio of the fuel and the air in each premixing passage 123 is ensured, and the strong flame stabilizing capability of the nozzle head 100 for the gas turbine is ensured.
In some embodiments, a first passage 126 is provided at an end of the premixing section 12 near the output section 13 to communicate the annular chamber with the second fuel delivery chamber 124, and a second passage 127 is provided on each of the plurality of premixing tubes 125 to communicate the second fuel delivery chamber 124 with the premixing passage 123.
Specifically, as shown in fig. 2 and 4, a plurality of premix tubes 125 adjacent to the annular cavity are distributed at equal intervals in the circumferential direction of the annular cavity, and a first passage 126 is formed between any adjacent two of the plurality of premix tubes 125. By providing first passage 126 at the end of premixing section 12 near output section 13, sufficient flow of fuel within first fuel delivery cavity 121 is ensured and cooling is improved.
The axial direction of the second passage 127 is angled from the axial direction of the premix tube 125, and the fuel outlet of the second passage 127 connected to the premix passage 123 is closer to the input section 11 of the body 1 than the fuel inlet of the second passage 127 connected to the second fuel delivery chamber 124, thereby facilitating the fuel to enter the premix passage 123 from the second fuel delivery chamber 124, and effectively avoiding the fuel from flowing backward to the air delivery passage 111.
It should be noted that the ratio of fuel to air in the premixing passage 123 is between 0.015 and 0.1, which ensures a strong flame holding capability of the nozzle tip 100 for a gas turbine. Preferably, the ratio of the fuel to the air in the premixing passage 123 is between 0.015 and 0.04, so that the high pollution problem caused by the high fuel and air mixing ratio is further reduced under the condition of ensuring the strong flame stabilizing capability of the nozzle head 100 for the gas turbine, and the pollutant emission level is further reduced on the premise of ensuring the flame stabilizing capability and the cooling effect.
In some embodiments, heat fins are provided within the first fuel delivery chamber 121.
As a result, the contact area between the fuel passing through the first fuel delivery cavity 121 and the first fuel delivery cavity 121 is larger, thereby further improving the heat exchange efficiency between the fuel and the premixing section 12 to further reduce the temperature of the outer sidewall of the nozzle head 100 for the gas turbine.
In some embodiments, the spouting holes 131 are straight holes, and the axial direction of the spouting holes 131 coincides with the axial direction of the body 1. Thereby further removing heat at the gas turbine nozzle tip 100 to further reduce the temperature of the outer sidewall of the gas turbine nozzle tip 100.
In some embodiments, as shown in fig. 1, the plurality of spouting holes 131 are provided, and projections of the plurality of spouting holes 131 are uniformly distributed on a projection of the output section 13 on a projection plane parallel to the cross section of the body 1.
Therefore, the temperature of each position of the end face of the nozzle head 100 for the gas turbine is ensured to be uniform, the damage of the body 1 caused by heat concentration at a certain position is avoided, and the risk of tempering high temperature at the body 1 is further reduced.
In some embodiments, the input section 11 has a second housing cavity 113 communicating with the premix passage 123, the fuel delivery passage 112 is located in the second housing cavity 113, and the second housing cavity 113 constitutes the air delivery passage 111.
As shown in fig. 2, the second accommodating chamber 113 is a cylindrical chamber, the premix tube 125 is a straight tube, the axial direction of the premix tube 125 is the same as the axial direction of the main body 1, and the left end opening of each of the plurality of premix channels 123 is communicated with the second accommodating chamber 113, so that it is ensured that the air in the second accommodating chamber 113 enters the premix channel 123 from the left end opening of the premix channel 123, and the structure of the input section 11 is simple.
In some embodiments, a main pipe 114 and a plurality of branch pipes 115 are disposed in the second accommodating cavity 113, the main pipe 114 and the branch pipes 115 form the fuel conveying passage 112, an axial direction of the main pipe 114 is consistent with an axial direction of the body 1, a first end of each of the plurality of branch pipes 115 is connected to the main pipe 114, a second end of each of the plurality of branch pipes 115 is communicated with the first fuel conveying cavity 121, and the plurality of branch pipes 115 are circumferentially spaced along the body 1.
The axis of the main pipe 114 is approximately coincident with the axis of the body 1, the number of the branch pipes 115 is four, and the four branch pipes 115 are distributed at equal intervals along the circumferential direction of the main pipe 114. The left end opening of each of the four branched ducts 115 communicates with the main duct 114. Therefore, by arranging the plurality of branch pipes 115, the fuel input into the first fuel delivery cavity 121 is ensured to be distributed more uniformly, and uniform heat dissipation to each position of the outer side wall of the premixing section 12 is further ensured.
A gas turbine nozzle according to an embodiment of the present invention includes a center body, a head portion of which constitutes a gas turbine nozzle tip 100 as in any of the embodiments described above.
Technical advantages of the nozzle for a gas turbine according to the embodiment of the present invention are the same as those of the nozzle head 100 for a gas turbine described above, and thus, detailed description thereof is omitted.
The nozzle for the gas turbine according to the embodiment of the present invention includes a center body and the nozzle tip 100 for the gas turbine as in any of the above embodiments, and the nozzle tip 100 for the gas turbine is detachably connected to a head portion of the center body.
According to the nozzle for the gas turbine provided by the embodiment of the invention, the nozzle head 100 for the gas turbine is detachably connected by arranging the central body, so that the nozzle head 100 for the gas turbine is convenient to maintain and replace, and the manufacturing and maintenance cost of the nozzle for the gas turbine is low.
Other technical advantages of the nozzle for a gas turbine according to the embodiments of the present invention are the same as those of the nozzle head 100 for a gas turbine described above, and thus, detailed description thereof is omitted.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A nozzle tip for a gas turbine, comprising: the fuel injection device comprises a body, wherein the body comprises an input section, a premixing section and an output section which are connected along the axial direction of the body, the input section is provided with an air delivery channel and a fuel delivery channel, the premixing section is provided with a first fuel delivery cavity communicated with the fuel delivery channel and a premixing channel communicated with the air delivery channel, the first fuel delivery cavity is adjacent to the side wall surface of the premixing section, the first fuel delivery cavity is communicated with the premixing channel, and the output section is provided with an ejection hole communicated with the premixing channel;
the first fuel delivery cavity is an annular cavity;
the premixing section is provided with a second fuel conveying cavity which is coaxial with the annular cavity, a plurality of premixing pipes which are distributed at intervals are arranged in the second fuel conveying cavity, each premixing pipe forms the premixing channel, and the first fuel conveying cavity is communicated with the premixing channel through the second fuel conveying cavity;
and one end of the premixing section, which is close to the output section, is provided with a first channel for communicating the annular cavity and the second fuel conveying cavity, and each of the premixing pipes is provided with a second channel for communicating the second fuel conveying cavity and the premixing channel.
2. A nozzle tip according to claim 1, wherein heat sink fins are provided in the first fuel delivery chamber.
3. A nozzle head for a gas turbine according to claim 1, characterized in that the ejection holes are straight holes, and an axial direction of the ejection holes coincides with an axial direction of the body.
4. A nozzle head for a gas turbine according to claim 1, characterized in that the ejection holes are plural, and projections of the plural ejection holes are uniformly distributed on a projection of the output section on a projection plane parallel to a cross section of the body.
5. A nozzle tip for a gas turbine according to claim 1, wherein the inlet section has a second receiving chamber in communication with the premix passage, the fuel delivery passage being located in the second receiving chamber, the second receiving chamber constituting the air delivery passage.
6. A nozzle head for a gas turbine according to claim 5, characterized in that a main duct and a plurality of branch ducts are provided in the second receiving chamber, the main duct and the branch ducts form the fuel delivery passage, the main duct has an axial direction that coincides with the axial direction of the body, a first end of each of the plurality of branch ducts is connected to the main duct, a second end of each of the plurality of branch ducts is connected to the first fuel delivery chamber, and the plurality of branch ducts are spaced apart from each other in the circumferential direction of the body.
7. A gas turbine nozzle comprising a center body, the head of which forms a gas turbine nozzle tip according to any one of claims 1 to 6.
8. A nozzle for a gas turbine, comprising a center body and a nozzle tip for a gas turbine according to any of claims 1-6, said nozzle tip for a gas turbine being detachably connected to a head portion of said center body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110825698.0A CN113483359B (en) | 2021-07-21 | 2021-07-21 | Nozzle head for gas turbine and nozzle for gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110825698.0A CN113483359B (en) | 2021-07-21 | 2021-07-21 | Nozzle head for gas turbine and nozzle for gas turbine |
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| Publication Number | Publication Date |
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| CN113483359A CN113483359A (en) | 2021-10-08 |
| CN113483359B true CN113483359B (en) | 2023-02-24 |
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| CN202110825698.0A Active CN113483359B (en) | 2021-07-21 | 2021-07-21 | Nozzle head for gas turbine and nozzle for gas turbine |
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Citations (5)
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| JPH08296851A (en) * | 1995-04-27 | 1996-11-12 | Hitachi Ltd | Gas turbine burner and burning method therefor |
| CN101818901A (en) * | 2009-02-27 | 2010-09-01 | 通用电气公司 | Premixed direct injection disk |
| CN102012043A (en) * | 2009-09-08 | 2011-04-13 | 通用电气公司 | Monolithic fuel injector and related manufacturing method |
| CN104534515A (en) * | 2014-12-03 | 2015-04-22 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | Combustion chamber head structure of gas turbine |
| CN113091094A (en) * | 2021-05-13 | 2021-07-09 | 中国联合重型燃气轮机技术有限公司 | Gas turbine combustor nozzle and method of premixing fuel and air in the nozzle |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8438853B2 (en) * | 2008-01-29 | 2013-05-14 | Alstom Technology Ltd. | Combustor end cap assembly |
| US9810148B2 (en) * | 2014-07-24 | 2017-11-07 | United Technologies Corporation | Self-cooled orifice structure |
-
2021
- 2021-07-21 CN CN202110825698.0A patent/CN113483359B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08296851A (en) * | 1995-04-27 | 1996-11-12 | Hitachi Ltd | Gas turbine burner and burning method therefor |
| CN101818901A (en) * | 2009-02-27 | 2010-09-01 | 通用电气公司 | Premixed direct injection disk |
| CN102012043A (en) * | 2009-09-08 | 2011-04-13 | 通用电气公司 | Monolithic fuel injector and related manufacturing method |
| CN104534515A (en) * | 2014-12-03 | 2015-04-22 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | Combustion chamber head structure of gas turbine |
| CN113091094A (en) * | 2021-05-13 | 2021-07-09 | 中国联合重型燃气轮机技术有限公司 | Gas turbine combustor nozzle and method of premixing fuel and air in the nozzle |
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| CN113483359A (en) | 2021-10-08 |
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