CN115646162A - Injection apparatus and flue gas denitration system - Google Patents
Injection apparatus and flue gas denitration system Download PDFInfo
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- CN115646162A CN115646162A CN202211296377.7A CN202211296377A CN115646162A CN 115646162 A CN115646162 A CN 115646162A CN 202211296377 A CN202211296377 A CN 202211296377A CN 115646162 A CN115646162 A CN 115646162A
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Abstract
The invention relates to the technical field of flue gas purification treatment, in particular to an injection device and a flue gas denitration system. The injection device provided by the embodiment of the invention is applied to an SNCR (selective non-catalytic reduction) denitration system, and ammonia gas is uniformly distributed and injected into a decomposing furnace through the injection device after ammonia water is gasified into ammonia gas. The injection pipe is located the dore furnace, the ammonia is behind the body of injection pipe, spout in the dore furnace through evenly distributed's heavy-calibre nozzle on the body, evenly cover the whole reaction cross-section of dore furnace, make the flue gas homogeneous mixing in ammonia and the dore furnace, increase the contact range of ammonia and flue gas, strengthen NOx's in ammonia and the flue gas contact reaction chance, the reaction generates nitrogen and water, high reaction efficiency, improve denitration efficiency, reduce the ammonia escape, aqueous ammonia effective utilization is high, and need not additionally to increase energy consumption and carbon and discharge.
Description
Technical Field
The invention relates to the technical field of flue gas purification treatment, in particular to an injection device and a flue gas denitration system.
Background
Pollutants generated in the field of cement industry are mainly particulate matters, sulfur dioxide and nitrogen oxides (NOx), and the emission reduction of the NOx is always the focus of recent attention of the nation and the industry. The cement kiln denitration technology mainly comprises staged combustion, selective non-catalyst reduction (SNCR) technology and Selective Catalyst Reduction (SCR) technology. The SNCR denitration technology of the cement kiln is most widely applied, and almost all cement kilns are provided with SNCR denitration systems. The most commonly used reducing agent is ammonia water with mass concentration of 20-25%. And the ammonia water is pumped out from the ammonia water storage tank in the factory by the ammonia water delivery pump. Under the pressure action of the delivery pump, the ammonia water passes through the two-fluid spray gun, is atomized by compressed air and then is sprayed into a suitable temperature interval of the decomposing furnace or the preheater in a foggy manner, and the ammonia water is gasified into ammonia gas and then undergoes redox reaction with nitrogen oxides in flue gas to generate nitrogen and water, so that the aim of removing the nitrogen oxides is fulfilled.
The aqueous ammonia sprays into through two fluid spray guns after compressed air atomizing, and decomposing furnace or pre-heater cross-section are big, and spray gun thermal state jet distance is short, and the penetrability is poor, and the aqueous ammonia sprays into the furnace in, the short time will gasify, is taken away by the flue gas, can't cover the flue gas circulation cross-section of whole decomposing furnace or pre-heater. In addition, a large amount of water enters the decomposing furnace, and heat is taken away after evaporation, so that coal consumption and carbon emission are increased.
Disclosure of Invention
The invention provides an injection device and a flue gas denitration system, which are used for solving one of the technical problems in the prior art, realizing uniform mixing of ammonia gas and flue gas in a decomposing furnace, increasing the contact range of the ammonia gas and the flue gas, strengthening the contact reaction opportunity of the ammonia gas and NOx in the flue gas, generating nitrogen and water through reaction, having high reaction efficiency, improving the denitration efficiency, reducing ammonia escape, having high effective utilization rate of ammonia water, and having no need of additionally increasing energy consumption and carbon emission.
The invention provides an injection device which comprises an injection pipe arranged in a decomposing furnace, wherein the injection pipe comprises a pipe body and a plurality of nozzles, and the plurality of nozzles are uniformly arranged on the outer side of the pipe body and are communicated with the pipe body.
According to the spraying device provided by the invention, the first sleeve is sleeved outside the nozzle.
According to the injection device provided by the invention, the second sleeve is sleeved on the outer side of the pipe body.
According to the injection device provided by the invention, the second sleeve is provided with the cooling air inlet, a channel is arranged between the inner wall of the second sleeve and the outer wall of the pipe body, and the cooling air inlet is communicated with the channel.
According to the spraying device provided by the invention, the spraying direction of the nozzle is parallel to the flow direction of the flue gas in the decomposing furnace.
The injection device provided by the invention further comprises a first header pipe, a plurality of branch pipes and a second header pipe, wherein the first header pipe is communicated with one ends of the branch pipes, the other end of each branch pipe is communicated with each second header pipe in a one-to-one correspondence mode, each second header pipe is communicated with the injection pipes, and each branch pipe is provided with a regulating valve and a flow meter.
The invention also provides a flue gas denitration system, which comprises a decomposing furnace, the ammonia water gasifier and the injection device, wherein the ammonia water gasifier is communicated with the injection pipe of the injection device, and the injection pipe is arranged in the decomposing furnace.
According to the flue gas denitration system provided by the invention, the top of the ammonia water gasifier is communicated with the tail of a cement kiln, and the bottom of the ammonia water gasifier is communicated with the injection pipe of the injection device.
The flue gas denitration system also comprises an induced draft fan, wherein the cement kiln tail is communicated with the ammonia water gasifier through the induced draft fan.
The flue gas denitration system further comprises a dust removal device, and the cement kiln tail is communicated with the induced draft fan through the dust removal device.
The injection device provided by the invention is applied to an SNCR (selective non-catalytic reduction) denitration system, and ammonia gas is uniformly injected into a decomposing furnace through the injection device after ammonia water is gasified into the ammonia gas. The injection pipe is located the dore furnace, the ammonia is behind the body of injection pipe, spout in the dore furnace through evenly distributed's heavy-calibre nozzle on the body, evenly cover the whole reaction cross-section of dore furnace, make the ammonia and the flue gas homogeneous mixing in the dore furnace, increase the contact range of ammonia and flue gas, strengthen NOx's in ammonia and the flue gas contact reaction chance, the reaction generates nitrogen and water, high reaction efficiency, improve denitration efficiency, reduce the ammonia escape, aqueous ammonia effective utilization is high, and need not additionally to increase energy consumption and carbon and discharge. According to the invention, through the arrangement of the injection pipe, the traditional scheme that ammonia water is atomized by compressed air through a double-fluid spray gun and then is injected into the decomposing furnace is replaced, and the problems that the hot-state injection distance of the spray gun is short, the penetrability is poor, the ammonia water is injected into a hearth, the ammonia water is gasified in a short time and taken away by smoke gas, the smoke gas circulation reaction section of the whole decomposing furnace cannot be covered, the ammonia water consumption of the SNCR denitration process is large, and the effective utilization rate is low are solved.
In addition to the technical problems addressed by the present invention, the technical features constituting the technical solutions and the advantages brought by the technical features of the technical solutions described above, other technical features of the present invention and the advantages brought by the technical features of the present invention will be further described with reference to the accompanying drawings or will be understood by the practice of the present invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of an injection tube of an injection apparatus provided in the present invention;
FIG. 2 is a schematic structural view of a spray device provided by the present invention;
FIG. 3 is a schematic structural diagram of a flue gas denitration system provided by the invention.
Reference numerals:
100. an injection pipe; 110. a tube body; 120. a nozzle; 130. a first sleeve; 140. a second sleeve; 150. a cooling air inlet; 160. a channel;
200. a first header pipe;
300. a branch pipe; 310. adjusting a valve; 320. a flow meter;
400. a second header pipe; 500. a decomposing furnace; 600. an ammonia water gasifier; 700. an induced draft fan; 800. a dust removal device; 900. cement kiln tail; 1000. and (4) storage tank.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, 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 intervening media. 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.
Further, in the description of the embodiments of the present invention, unless otherwise specified, "a plurality", and "a plurality" mean two or more, and "a plurality", "several", and "several groups" mean one or more.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in fig. 1 and 2, the injection apparatus according to the embodiment of the present invention includes an injection pipe 100 disposed in a decomposition furnace 500, wherein the injection pipe 100 includes a pipe body 110 and a plurality of nozzles 120, and the plurality of nozzles 120 are uniformly disposed outside the pipe body 110 and are communicated with the pipe body 110.
The injection device provided by the embodiment of the invention is applied to an SNCR (selective non-catalytic reduction) denitration system, and ammonia gas is uniformly injected into the decomposing furnace 500 through the injection device after ammonia water is gasified into ammonia gas. Injection pipe 100 is located dore furnace 500, the ammonia is behind injection pipe 100's body 110, spray dore furnace 500 in through evenly distributed's heavy-calibre nozzle 120 on body 110, evenly cover dore furnace 500's whole reaction cross-section, make the ammonia and the flue gas homogeneous mixing in dore furnace 500, increase the contact range of ammonia and flue gas, strengthen the contact reaction chance of NOx in ammonia and the flue gas, the reaction generates nitrogen and water, high reaction efficiency, improve denitration efficiency, reduce ammonia escape, aqueous ammonia effective utilization is high, and need not additionally to increase energy consumption and carbon emission. According to the invention, through the arrangement of the injection pipe 100, the traditional scheme that ammonia water is atomized by compressed air through a double-fluid spray gun and then is injected into the decomposing furnace 500 is replaced, and the problems that the spray gun is short in thermal state injection distance and poor in penetrability, the ammonia water is gasified in a short time when being injected into a hearth, is taken away by smoke gas and cannot cover the smoke gas circulation reaction section of the whole decomposing furnace 500, the ammonia water consumption of the SNCR denitration process is large, and the effective utilization rate is low are solved.
In this embodiment, the decomposing furnace 500 may also be a reaction or preheating device such as a preheater. In order to overcome the high temperature of 850-950 ℃ in the decomposing furnace 500, the contact material of the injection pipe 100 and the flue gas is 310S stainless steel.
According to one embodiment of the present invention, the first sleeve 130 is sleeved on the outer side of the nozzle 120. In this embodiment, in order to avoid the abrasion of the dust in the flue gas in the decomposing furnace 500 to the injection pipe 100, the first sleeve 130 is designed outside the nozzle 120 as a sleeve of the nozzle 120, so as to protect the nozzle 120, thereby ensuring that the injection device can continuously and safely operate for a long time. The problem of the nozzle of traditional spray gun contact with high concentration dust for a long time, cause the deformation because of wearing and tearing, the further variation in aqueous ammonia atomization effect causes the aqueous ammonia consumption big, and effective utilization is low, and ammonia escape is high, and the denitration is inefficient is solved.
In this embodiment, the nozzle 120 is disposed at a corresponding hole on the tube body 110, a portion of the nozzle is located inside the tube body 110, a portion of the nozzle is located outside the tube body 110, the first sleeve 130 wraps the outer side of the nozzle 120 integrally, and a portion of the nozzle is located inside the tube body 110 and a portion of the nozzle is located outside the tube body 110, so that a sealing effect between the nozzle 120 and the hole can be ensured.
The first sleeve 130 may be made of 310S stainless steel, which is resistant to wear and high temperature.
According to an embodiment of the present invention, the second sleeve 140 is sleeved on the outer side of the tube 110. In this embodiment, in order to avoid the abrasion of the dust in the flue gas in the decomposing furnace 500 to the injection pipe 100, the second sleeve 140 is designed outside the pipe body 110 as a sleeve of the pipe body 110, so as to protect the pipe body 110, thereby ensuring that the injection device can continuously and safely operate for a long time. The second sleeve 140 is disposed at a corresponding aperture location of the nozzle 120, as the nozzle 120 extends through the second sleeve 140.
The second sleeve 140 may be made of 310S stainless steel, which is resistant to wear and high temperature.
According to an embodiment of the present invention, the second sleeve 140 is provided with a cooling air inlet 150, a channel 160 is formed between an inner wall of the second sleeve 140 and an outer wall of the tube body 110, and the cooling air inlet 150 is communicated with the channel 160. In this embodiment, the gap between the tube body 110 and the second sleeve 140 forms an annular channel 160, the cooling air inlet 150 on the second sleeve 140 is communicated with cooling air, and cooling air is introduced into the channel 160 through the cooling air inlet, so that the cooling air flows in the channel 160 to cool the second sleeve 140 and the tube body, and is then sprayed into the decomposing furnace 500 after cooling, thereby avoiding the problem of thermal stress deformation of the injection tube 100 caused by high temperature of 800-900 ℃ in the decomposing furnace 500, and ensuring continuous, safe and long-time operation of the injection device.
According to one embodiment of the present invention, the spraying direction of the nozzle 120 is parallel to the flow direction of the flue gas in the decomposition furnace 500. In this embodiment, in order to avoid the nozzle 120 from being blocked, the injection directions of all the nozzles 120 on the injection pipe 100 are parallel to the flow direction of the flue gas in the decomposition furnace 500, so as to avoid the dust in the flue gas from staying at the nozzle 120, and the ammonia gas is injected to contact with the flue gas, and simultaneously the flue gas is blown away from the nozzle 120 by the airflow, so as to avoid the accumulation of the dust in the flue gas at the nozzle 120 to the greatest extent.
According to an embodiment provided by the present invention, the injection apparatus further includes a first header pipe 200, a plurality of branch pipes 300, and a second header pipe 400, the first header pipe 200 is communicated with one ends of the plurality of branch pipes 300, the other end of each branch pipe 300 is communicated with the second header pipe 400 in a one-to-one correspondence, each second header pipe 400 is communicated with the plurality of injection pipes 100, and each branch pipe 300 is provided with a regulating valve 310 and a flow meter 320. In this embodiment, ammonia gas formed by gasifying ammonia water enters the second header pipe 400 through the first header pipe 200, the first header pipe 200 and the second header pipe 400 are communicated through the branch pipe 300, and the ammonia gas enters the injection pipe 100 through the second header pipe 400 and is finally injected from the nozzle 120. The branch pipe 300 is provided with a flow meter 320 and an adjusting valve 310, the ammonia gas throughput of each second header pipe 400 can be independently controlled according to the different NOx concentration requirements of the same section of the decomposing furnace 500, the NOx concentration is high, the opening degree of the adjusting valve 310 is adjusted to be larger, otherwise, the opening degree of the adjusting valve 310 is adjusted to be smaller, and the proper ammonia nitrogen ratio of each area in the decomposing furnace 500 is always kept.
The cooperation of a plurality of injection pipes 100 that all set up on flowmeter 320, governing valve 310 and every little header pipe separates the structure, can make and reach the effect of the adjustable ammonia gas injection volume of subregion in the dore 500, according to the difference of different regional NOx concentration, spouts suitable amount of ammonia, guarantees the best ammonia nitrogen ratio all the time, reduces the ammonia and escapes, and denitration efficiency is high, and the aqueous ammonia consumption is few.
As shown in fig. 3, an embodiment of the present invention further provides a flue gas denitration system, which includes a decomposition furnace 500, an ammonia water vaporizer 600, and the injection apparatus according to the above embodiment, wherein the ammonia water vaporizer 600 is communicated with an injection pipe 100 of the injection apparatus, and the injection pipe 100 is disposed in the decomposition furnace 500.
According to the flue gas denitration system provided by the embodiment of the invention, the storage tank 1000 conveys ammonia water into the ammonia water gasifier 600, the ammonia water is gasified into ammonia gas through the ammonia water gasifier 600, and the ammonia gas is uniformly sprayed in the decomposing furnace 500 through the spraying device, namely the gasified ammonia gas is uniformly sprayed to the whole reaction section of the decomposing furnace 500 through the nozzle 120, so that the ammonia gas and the flue gas in the decomposing furnace 500 are uniformly mixed, the contact range of the ammonia gas and the flue gas is increased, the contact reaction opportunity of the ammonia gas and NOx in the flue gas is enhanced, nitrogen and water are generated through reaction, the reaction efficiency is high, the denitration efficiency is improved, the ammonia escape is reduced, the effective utilization rate of the ammonia water is high, and the energy consumption and carbon emission are not required to be additionally increased. According to the invention, through the arrangement of the injection pipe 100, the traditional scheme that ammonia water is atomized by compressed air through a double-fluid spray gun and then is injected into the decomposing furnace 500 is replaced, and the problems that the spray gun is short in thermal state injection distance and poor in penetrability, the ammonia water is gasified in a short time when being injected into a hearth, is taken away by smoke gas and cannot cover the smoke gas circulation reaction section of the whole decomposing furnace 500, the ammonia water consumption of the SNCR denitration process is large, and the effective utilization rate is low are solved.
According to one embodiment of the present invention, the top of the ammonia water gasifier 600 is communicated with the cement kiln tail 900, and the bottom of the ammonia water gasifier 600 is communicated with the injection pipe 100 of the injection device. In this embodiment, in the ammonia water vaporizer 600, the purified high-temperature flue gas and the atomized ammonia water are fully mixed, and the ammonia water is vaporized into ammonia gas by using the flue gas waste heat of the cement kiln tail 900 to form a flue gas and ammonia gas mixed gas, wherein the temperature of the mixed gas is ensured to be above 120 ℃, so that low-temperature condensation of the vaporized water in a subsequent pipeline is avoided. The mixed gas of the flue gas and the ammonia gas is uniformly sprayed into the decomposing furnace 500 through the spraying device, and the nitrogen oxides in the flue gas to be denitrated are fully contacted and reacted with the ammonia gas to generate nitrogen and water, so that the ammonia water is gasified outside the decomposing furnace 500 in advance, and the energy consumption and the carbon emission are reduced. In addition, the embodiment gasifies the ammonia water by using the waste heat of the flue gas, does not consume other energy sources, saves energy consumption, and reduces CO 2 And (4) discharging the amount.
In order to ensure the safety, the volume ratio of the ammonia gas in the mixed gas of the flue gas and the ammonia gas is less than or equal to 5 percent.
According to one embodiment provided by the invention, the flue gas denitration system further comprises an induced draft fan 700, and the cement kiln tail 900 is communicated with the ammonia water gasifier 600 through the induced draft fan 700. In the embodiment, the flue gas with the temperature of about 300-350 ℃ at the outlet of the preheater of the cement kiln tail 900 is pressurized by the induced draft fan 700 and then is sent into the ammonia water gasifier 600, and the induced draft fan 700 needs enough pressure of 8000-10000Pa in order to ensure that the gas at the outlet of the nozzle 120 has enough flow velocity of 30-50 m/s.
In this embodiment, after being connected in parallel, the two induced draft fans 700 are connected in series with the preheater of the cement kiln tail 900 and the ammonia water gasifier 600, one induced draft fan 700 is an operating device, and the other induced draft fan 700 is a standby device, so as to prevent the induced draft fans 700 from being out of operation due to faults.
According to an embodiment provided by the invention, the flue gas denitration system further comprises a dust removal device 800, and the cement kiln tail 900 is communicated with the induced draft fan 700 through the dust removal device 800. In this embodiment, the flue gas at the outlet of the preheater of the cement kiln tail 900 is introduced into the dust removal device 800 through the induced draft fan 700, the flue gas after dust removal is pressurized by the induced draft fan 700 and sent into the ammonia water gasifier 600, in order to ensure that the nozzle 120 is not blocked by smoke, the dust removal device 800 can adopt a metal filter bag dust remover, and the dust content at the outlet of the dust remover is less than or equal to 10mg/Nm 3 。
When in use, the adjusting valve 310 is not limited to a stop valve, an electric valve, an electromagnetic valve, or other valve capable of being opened and closed.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An injection device, characterized by: the device comprises an injection pipe arranged in a decomposing furnace, wherein the injection pipe comprises a pipe body and a plurality of nozzles, and the plurality of nozzles are uniformly arranged on the outer side of the pipe body and communicated with the pipe body.
2. The jetting device of claim 1, wherein: the outer side of the nozzle is sleeved with a first sleeve.
3. The jetting device of claim 1, wherein: the second sleeve is sleeved on the outer side of the pipe body.
4. The jetting device of claim 3, wherein: and a cooling air inlet is formed in the second sleeve, a channel is formed between the inner wall of the second sleeve and the outer wall of the pipe body, and the cooling air inlet is communicated with the channel.
5. The jetting device of claim 1, wherein: the spraying direction of the nozzle is parallel to the flow direction of the flue gas in the decomposing furnace.
6. The jetting device of claim 1, wherein: the injection device is characterized by further comprising a first header pipe, a plurality of branch pipes and a second header pipe, wherein the first header pipe is communicated with one ends of the branch pipes, the other end of each branch pipe is communicated with the corresponding second header pipe one to one, each second header pipe is communicated with the plurality of injection pipes, and each branch pipe is provided with a regulating valve and a flow meter.
7. The utility model provides a flue gas denitration system which characterized in that: comprising a decomposition furnace, an ammonia water vaporizer and an injection device according to any one of claims 1 to 6, the ammonia water vaporizer being in communication with an injection pipe of the injection device, the injection pipe being disposed within the decomposition furnace.
8. The flue gas denitration system of claim 7, wherein: the top of the ammonia water gasifier is communicated with the tail of the cement kiln, and the bottom of the ammonia water gasifier is communicated with an injection pipe of the injection device.
9. The flue gas denitration system of claim 8, wherein: still include the draught fan, the cement kiln tail passes through the draught fan with aqueous ammonia vaporizer intercommunication.
10. The flue gas denitration system of claim 9, wherein: the cement kiln tail is communicated with the draught fan through the dust removal device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211296377.7A CN115646162A (en) | 2022-10-21 | 2022-10-21 | Injection apparatus and flue gas denitration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211296377.7A CN115646162A (en) | 2022-10-21 | 2022-10-21 | Injection apparatus and flue gas denitration system |
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| CN115646162A true CN115646162A (en) | 2023-01-31 |
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| CN202211296377.7A Pending CN115646162A (en) | 2022-10-21 | 2022-10-21 | Injection apparatus and flue gas denitration system |
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- 2022-10-21 CN CN202211296377.7A patent/CN115646162A/en active Pending
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