CN213113232U - Coal gas cleaning device and coal gas system - Google Patents
Coal gas cleaning device and coal gas system Download PDFInfo
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- CN213113232U CN213113232U CN202020787457.2U CN202020787457U CN213113232U CN 213113232 U CN213113232 U CN 213113232U CN 202020787457 U CN202020787457 U CN 202020787457U CN 213113232 U CN213113232 U CN 213113232U
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- gas
- inner cylinder
- alkali liquor
- liquid separation
- outer cylinder
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
- C10K1/12—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors
Abstract
The utility model relates to a coal gas cleaning device, which comprises an outer cylinder, an inner cylinder and an alkali liquor injector head; the outer cylinder is sleeved on the inner cylinder, each alkali liquor injector head is fixed on the inner cylinder and sprays liquid to the inner cavity of the inner cylinder, a gas channel is arranged between the outer cylinder and the inner cylinder, one end of the inner cylinder is provided with a gas inlet, the other end of the inner cylinder is provided with a gas-liquid separation opening, the gas channel is communicated with the gas-liquid separation opening, and the outer cylinder is provided with a gas outlet. The utility model discloses a design gas cleaning device for bilayer structure, the inner tube is arranged in acid-base neutralization reaction and removes the acid material in the coal gas, makes it obtain purifying, and the coal gas that contains alkali lye is gas-liquid separation in gas-liquid separation opening and gas channel, discharges to the gas system pipeline from the gas outlet pipeline at last, thereby solves among the prior art low reaches blast furnace gas system pipeline and relevant equipment and takes place fast corrosion and jam easily and influence the technical problem of whole gas system normal operating; the flow channel arrangement of the double-layer structure enables the coal gas to be fully contacted with the alkali liquor.
Description
Technical Field
The utility model relates to a technical field of coal gas treatment, concretely relates to coal gas cleaning device and coal gas system.
Background
The blast furnace uses steel plate as furnace shell, and refractory brick lining is built in the shell. The blast furnace body is divided into a furnace throat, a furnace body, a furnace waist, a furnace belly and a furnace hearth 5 from top to bottom. Because of the advantages of good economic index, simple process, large production capacity, high labor production efficiency, low energy consumption and the like of the blast furnace ironmaking technology, the iron produced by the method accounts for the vast majority of the total iron production in the world. In the production of a blast furnace, iron ore, coke, and a flux (limestone) for slag formation are charged from the top of the furnace, and preheated air is blown through tuyeres located along the periphery of the furnace at the lower part of the furnace. Carbon in coke (some blast furnaces also blow auxiliary fuel such as coal dust, heavy oil, natural gas and the like) at high temperature is combusted with oxygen blown into air to generate carbon monoxide and hydrogen, and oxygen in iron ore is removed in the ascending process in the furnaces, so that iron is obtained by reduction. The smelted molten iron is discharged from the iron notch. Unreduced impurities in the iron ore are combined with fluxes such as limestone to generate slag, and the slag is discharged from a slag hole. The generated gas is discharged from the top of the furnace, and is used as fuel for hot blast stoves, heating furnaces, coke ovens, boilers and the like after dust removal. The main product of blast furnace smelting is pig iron, and the byproducts of blast furnace slag and blast furnace gas are also produced.
However, most of the blast furnace systems in China currently discharge gas generated in the blast furnace systems after adopting a dry dust removal process, and pipelines and related equipment of downstream blast furnace gas systems can generate certain corrosion phenomena, which are more serious in the phenomena of perforation of gas pipelines, corrosion and cracking of compensator holes, corrosion of parts such as gas valves, pressure reducing valve banks and the like, scaling and blockage of solid salts and the like. Research results show that the root cause of the corrosion of blast furnace gas pipelines and accessory facilities is that H + and Cl-ions in gas condensate water seriously exceed the standard. The rapid corrosion brings serious potential safety hazard to the normal operation of a gas system, and the process modification task of the blast furnace gas system is urgent. Therefore, improvement is desired.
SUMMERY OF THE UTILITY MODEL
The utility model provides a coal gas cleaning device has solved among the prior art thereby the technical problem that low reaches blast furnace gas system pipeline and relevant equipment take place fast corrosion easily and block up influence whole gas system normal operating.
The utility model provides a scheme as follows of above-mentioned technical problem: a coal gas cleaning device comprises an outer cylinder, an inner cylinder and at least one alkali liquor injector head; the outer cylinder is sleeved on the inner cylinder, each alkali liquor injector head is fixed on the inner cylinder and sprays liquid to the inner cavity of the inner cylinder, a gas channel is arranged between the outer cylinder and the inner cylinder, a gas inlet is arranged at one end of the inner cylinder, a gas-liquid separation opening is arranged at the other end of the inner cylinder, the gas channel is communicated with the gas-liquid separation opening, and a gas outlet communicated with the gas channel is arranged on the outer cylinder.
When the coal gas flows in the inner cavity of the inner barrel, the coal gas can flow into the coal gas channel through the gas-liquid separation opening. A gas inlet pipeline is arranged at the gas inlet.
Further, the inner cylinder is of a convergent-divergent nozzle structure, and the cross sectional areas of the two ends of the inner cylinder are smaller than the cross sectional area of the middle of the inner cylinder.
Further, the cross-sectional area of the gas inlet is smaller than that of the gas-liquid separation opening.
Further, the central axis of the outer cylinder is in the vertical direction; the gas inlet pipeline is positioned at the upper end of the outer barrel, and the gas-liquid separation opening is positioned at the lower end of the outer barrel.
Further, the gas outlet is positioned on one side of the upper part of the outer barrel, a gas outlet pipeline is arranged at the gas outlet, and the gas outlet pipeline is horizontally arranged.
Furthermore, the outer barrel is installed on a fixed foundation, a water collecting tank is arranged in the fixed foundation, each alkali liquor injector head is installed on the gas inlet pipeline and horizontally arranged, the gas cleaning device further comprises an alkali liquor circulating system, and each alkali liquor injector head is communicated with the water collecting tank through the alkali liquor circulating system.
Further, the lower extreme of inner tube is equipped with the inner tube frame, the inner tube frame is fixed in the pond catchments.
Furthermore, a dehydration layer is arranged in the gas channel.
Furthermore, a support frame is arranged in the gas channel, and the dehydration layer is arranged in the gas channel through the support frame.
The utility model has the advantages that: the gas cleaning device is designed into a double-layer structure of the outer cylinder and the inner cylinder, the inner cylinder is used for acid-base neutralization reaction to remove acid substances in the gas so as to purify the gas, the gas containing alkali liquor is subjected to gas-liquid separation in a gas-liquid separation opening and a gas channel, and finally the gas is discharged to a gas system pipeline from a gas outlet, so that the technical problem that the normal operation of the whole gas system is influenced because the pipeline of a downstream blast furnace gas system and related equipment are easily subjected to quick corrosion and blockage in the prior art is solved; the flow channel arrangement of the double-layer structure enables the coal gas to be fully contacted with the alkali liquor.
The coal gas discharged by the blast furnace system passes through the coal gas inlet pipeline of the inner barrel, is subjected to neutralization reaction with alkali liquor sprayed by the alkali liquor spraying head, then passes through the gas-liquid separation opening along the pipe wall of the inner barrel, enters the coal gas channel, is subjected to gas-liquid separation in the gas-liquid separation opening and the coal gas channel, and finally is discharged from the coal gas outlet pipeline.
The utility model also provides a gas system.
The technical scheme is as follows: a gas system comprises a gas cleaning device and a gas system body, wherein the gas system body is communicated with a gas outlet pipeline.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings. The detailed description of the present invention is given by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a schematic view of an internal structure of a gas cleaning device according to an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
100. a coal gas cleaning device; 10. an outer cylinder; 11. a gas outlet conduit; 20. an inner barrel; 21. A gas inlet conduit; 22. a gas-liquid separation opening; 30. an alkali liquor injector head; 40. maintaining the platform; 50. an inspection manhole; 60. dehydrating the layer; 70. a support frame; 80. an inner cylinder frame; 90. a water collecting tank; 101. fixing a foundation; 102. the outer cylinder bottom plate.
Detailed Description
The principles and features of the present invention will be described with reference to the accompanying fig. 1, wherein the examples are provided only for explaining the present invention and are not intended to limit the scope of the present invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the utility model provides a gas cleaning device, the gas cleaning device 100 comprises an outer cylinder 10, an inner cylinder 20 and at least one alkali liquor injector head 30; the outer cylinder 10 is sleeved on the inner cylinder 20, each alkali liquor injector head 30 is fixed on the inner cylinder 20 and sprays liquor to the inner cavity of the inner cylinder, a gas channel is arranged between the outer cylinder 10 and the inner cylinder 20, a gas inlet pipeline 21 is arranged at one end of the inner cylinder 2, a gas-liquid separation opening 22 is arranged at the other end of the inner cylinder 20, the gas inlet pipeline 21 is communicated with the gas-liquid separation opening 22, and a gas outlet pipeline 11 is arranged on the outer cylinder 10.
It is understood that the gas passage means a pipe between the inner wall of the outer cylinder 10 and the outer wall of the inner cylinder 20.
The coal gas discharged from the blast furnace system passes through the coal gas inlet pipeline 21 of the inner barrel 20, is subjected to neutralization reaction with alkali liquor sprayed from the alkali liquor spraying head 30, then passes through the gas-liquid separation opening 22 along the pipe wall of the inner barrel 20, then enters the coal gas channel, the coal gas containing the alkali liquor is subjected to gas-liquid separation in the gas-liquid separation opening 22 and the coal gas channel, and finally, clean coal gas is discharged from the coal gas outlet pipeline 11.
In the above embodiment, the gas cleaning device 100 is designed as a double-layer structure of the outer cylinder 10 and the inner cylinder 20, the inner cylinder 20 is used for acid-base neutralization reaction to remove acidic substances in the gas, so that the gas is purified, the gas containing alkali liquor is subjected to gas-liquid separation in the gas-liquid separation opening 22 and the gas channel, and finally the gas is discharged from the gas outlet pipeline 11 to the gas system pipeline, so that the technical problem that the normal operation of the whole gas system is affected due to the fact that the downstream blast furnace gas system pipeline and related equipment are easily rapidly corroded and blocked in the prior art is solved.
By utilizing the acid-base neutralization principle, the full contact between the coal gas and the alkali liquor is realized by adopting the special flow channel arrangement, and the acid components contained in the coal gas are efficiently removed. The novel device can effectively slow down the corrosion speed of the blast furnace gas pipeline and the accessory equipment, and ensure the long-term stable operation of the gas system.
It should be noted that the gas containing the lye can be separated into gas and liquid in the gas-liquid separation opening 22 and the gas channel by gravity or by flow velocity. The lye jet head 30 can be in communication with an external lye pump. In addition, the alkali liquor spray head can be connected with a circulating alkali liquor pipe through a pipeline, and a flow regulating valve is arranged at the inlet of the circulating alkali liquor pipeline and interlocked with the detected values of parameters such as gas pressure, flow temperature and the like to regulate and set the alkali liquor spraying speed and flow.
Preferably, in other embodiments, the inner cylinder 20 is a convergent-divergent nozzle structure, and the cross-sectional area of both ends of the inner cylinder 20 is smaller than that of the middle portion thereof. Through designing inner tube 2 for the nozzle structure that contracts and enlarges, the middle part mouth of pipe reduces, is favorable to carrying out intensive mixing at the middle part between coal gas and the alkali lye, improves its acid-base neutralization reaction efficiency, and prolongs the mixing time.
Preferably, in order to facilitate the rapid and efficient transportation of the gas containing lye along the pipe, the cross-sectional area of the gas inlet pipe 21 is smaller than the cross-sectional area of the gas-liquid separation opening 22.
Preferably, the central axis of the outer cylinder 10 is in the vertical direction; the gas inlet pipe 21 is located at the upper end of the outer cylinder 10, and the gas-liquid separation opening 22 is located at the lower end of the outer cylinder 10, so that gas transmission and gas-liquid separation can be performed by using gravity.
Preferably, in order to prolong the gas-liquid separation time and improve the gas-liquid separation efficiency by using gravity factors, a gas outlet pipeline 11 is arranged on one side of the upper part of the outer cylinder 10, and the gas outlet pipeline 11 is horizontally arranged.
Preferably, the outer cylinder 10 is mounted on a fixed foundation 101, a water collecting tank 90 is arranged in the fixed foundation 101, each alkali liquor injector head 30 is mounted on the gas inlet pipeline 21 and horizontally arranged, the gas washing device 100 further comprises an alkali liquor circulating system, and each alkali liquor injector head 30 is communicated with the water collecting tank 90 through the alkali liquor circulating system. The gas flow is carried with the alkali liquor to impact the alkali liquor in the collecting tank, the surface of the alkali liquor is fluctuated, and the gas is in secondary contact with the alkali liquor in the alkali liquor tank.
Wherein, the outer cylinder 10 adopts a design without a bottom plate, and the water collecting tank 90 is arranged under the foundation surface, thereby effectively reducing the height of the tower body and the investment. The alkali liquor spraying direction of the alkali liquor spraying head 30 is the same as the gas flow, and the gas and the liquid are fully contacted through the inner cylinder convergent-divergent nozzle, so that the acid components contained in the blast furnace gas are effectively removed. The gas and the alkali liquor are fully mixed in the inner barrel, gas-liquid separation is carried out after impact is formed on the liquid level in the alkali liquor tank, and the gas flow direction is reversed to enter the annular gas phase channel; the gas and the alkali liquor are fully mixed in the inner barrel, gas-liquid separation is carried out after impact is formed on the liquid level in the alkali liquor tank, and the gas flow direction is reversed to enter the annular gas phase channel.
Preferably, in order to ensure the stability of the device under the impact of fluid, the lower end of the inner cylinder 20 is provided with an inner cylinder frame 80, and the inner cylinder frame 80 is fixed in the water collecting tank 90. It can be understood that the inner cylinder 20 and the water surface of the lye recovery tank have certain space to realize the gas reverse flow.
Preferably, to deliver a dehydration efficiency, a dehydration layer 60 is installed in the gas channel.
The dehydration layer can be designed into the combination of a stainless steel wire mesh and aluminum alloy flower ring packing, so that the mechanical water contained in the coal gas can be efficiently removed, and the requirement of a user on the combustion temperature of the coal gas can be met; the dewatering layer can be cotton material or any other material with dewatering function.
Preferably, a support frame 70 is arranged in the gas channel, and the dehydration layer 60 is installed in the gas channel through the support frame 70.
Preferably, an outer cylinder bottom plate 102 is arranged at the lower end of the outer cylinder 10, and the outer cylinder 10 is fixedly connected with a fixed foundation 101 through the outer cylinder bottom plate 102.
The gas outlet pipeline 11 is provided with a plurality of maintenance platforms 40 and inspection manholes 50, and the outer cylinder 10 is provided with the maintenance platforms 40 and the inspection manholes 50.
The utility model also provides a gas system, including gas cleaning device 100 and gas system body, the gas system body with gas outlet pipeline 11 intercommunication.
It should be pointed out that, the utility model discloses well coal gas cleaning device and coal gas system except being applied to blast furnace system field, can also be applied to other any coal gas sources that have acidic impurity, all belong to within the scope of protection of the utility model.
The utility model discloses a concrete theory of operation and application method do: impurity gas discharged by a blast furnace system passes through a gas inlet pipeline 21 of the inner barrel 20, is subjected to neutralization reaction with alkali liquor sprayed by the alkali liquor spraying head 30, then passes through the gas-liquid separation opening 22 along the pipe wall of the inner barrel 20, then enters the gas channel, the gas containing the alkali liquor is subjected to first gas-liquid separation in the gas-liquid separation opening 22 and the gas channel, then is subjected to second separation at a dehydration layer 60, and finally is discharged from the gas outlet pipeline 11.
The utility model has simple structure, less system investment and convenient maintenance; the blast furnace gas cleaning device 100 of the utility model can achieve the removal rate of acid gas components in the blast furnace gas above 98 percent, the pressure loss of the gas is less than 2kPa, and the mechanical water content of the export gas is less than 5g/m 3.
The utility model aims to deacidify and desalt the blast furnace gas under the dry dedusting operation condition, and reduce the pollution and corrosion of the gas condensed water acid environment and various salt ions to pipelines and accessory equipment; meanwhile, peripheral auxiliary facilities are simplified, and environmental pollution is reduced.
The utility model discloses mainly for after solving the acid composition dissolution in the iron and steel trade blast furnace gas in the coal gas comdenstion water, form the corruption of strong acid water-soluble environment to carbon steel pipeline and equipment to and the high concentration chloride ion produces the pitting corrosion to stainless steel equipment in the comdenstion water.
By reasonably arranging the gas-liquid flow passages, the contact time of the alkali liquor and the acidic components in the coal gas is prolonged by respectively utilizing the methods of gas-liquid two-phase acid-alkali neutralization, liquid level fluctuation absorption, gas-liquid homodromous contact and the like, the coal gas cleaning efficiency is improved, and the effective removal rate of the acidic components can reach more than 98 percent.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the present invention can be smoothly implemented by those skilled in the art according to the drawings and the above description; however, those skilled in the art should understand that changes, modifications and variations made by the above-described technology can be made without departing from the scope of the present invention, and all such changes, modifications and variations are equivalent embodiments of the present invention; meanwhile, any changes, modifications, evolutions, etc. of the above embodiments, which are equivalent to the actual techniques of the present invention, still belong to the protection scope of the technical solution of the present invention.
Claims (10)
1. The gas cleaning device is characterized in that the gas cleaning device (100) comprises an outer cylinder (10), an inner cylinder (20) and at least one alkali liquor injection head (30);
the alkali liquor spraying device is characterized in that the inner cylinder (20) is sleeved with the outer cylinder (10), each alkali liquor spraying head (30) is fixed on the inner cylinder (20) and sprays liquor to the inner cavity of the inner cylinder, a gas channel is arranged between the outer cylinder (10) and the inner cylinder (20), a gas inlet is arranged at one end of the inner cylinder (20), a gas-liquid separation opening (22) is arranged at the other end of the inner cylinder (20), the gas channel is communicated with the gas-liquid separation opening (22), and a gas outlet communicated with the gas channel is arranged on the outer cylinder (10).
2. The gas washing apparatus according to claim 1, wherein the inner tube (20) has a convergent-divergent nozzle structure, and a cross-sectional area of both ends of the inner tube (20) is smaller than a cross-sectional area of a middle portion thereof.
3. The gas washing apparatus according to claim 2, wherein the cross-sectional area of the gas inlet is smaller than the cross-sectional area of the gas-liquid separation opening (22).
4. The gas washing apparatus according to claim 1, wherein the central axis of the outer cylinder (10) is in a vertical direction; the coal gas inlet is positioned at the upper end of the outer barrel (10), and the gas-liquid separation opening (22) is positioned at the lower end of the outer barrel (10).
5. The gas washing device according to claim 1, wherein the gas outlet is located at one side of the upper portion of the outer cylinder (10), a gas outlet pipe (11) is arranged at the gas outlet, and the gas outlet pipe (11) is horizontally arranged.
6. The gas washing device according to claim 1, wherein the outer cylinder (10) is mounted on a fixed foundation (101), a water collecting tank (90) is arranged in the fixed foundation (101), each alkali liquor spraying head (30) is mounted on the gas inlet and horizontally arranged, the gas washing device (100) further comprises an alkali liquor circulating system, and each alkali liquor spraying head (30) is communicated with the water collecting tank (90) through the alkali liquor circulating system.
7. The gas cleaning device according to claim 6, wherein an inner cylinder frame (80) is provided at a lower end of the inner cylinder (20), and the inner cylinder frame (80) is fixed in the water collecting tank (90).
8. The gas washing apparatus according to claim 1, wherein a dewatering layer (60) is installed in the gas passage.
9. The gas cleaning device according to claim 8, wherein a support frame (70) is provided in the gas passage, and the dehydration layer (60) is installed in the gas passage through the support frame (70).
10. A gas system, comprising a gas washing device (100) according to any one of claims 1 to 9 and a gas system body, the gas system body being in communication with the gas outlet.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020787457.2U CN213113232U (en) | 2020-05-13 | 2020-05-13 | Coal gas cleaning device and coal gas system |
| PCT/CN2020/140763 WO2021227521A1 (en) | 2020-05-13 | 2020-12-29 | Gas cleaning apparatus and gas system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020787457.2U CN213113232U (en) | 2020-05-13 | 2020-05-13 | Coal gas cleaning device and coal gas system |
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| Publication Number | Publication Date |
|---|---|
| CN213113232U true CN213113232U (en) | 2021-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020787457.2U Active CN213113232U (en) | 2020-05-13 | 2020-05-13 | Coal gas cleaning device and coal gas system |
Country Status (2)
| Country | Link |
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| CN (1) | CN213113232U (en) |
| WO (1) | WO2021227521A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115212701A (en) * | 2022-07-22 | 2022-10-21 | 重庆钢铁股份有限公司 | Coal gas dehydration purifier |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2436577C3 (en) * | 1974-07-30 | 1980-08-28 | Verfahrenstechnik Dr.-Ing. Kurt Baum, 4300 Essen | Device for the separation of the termebels remaining in the coke oven gas after it has been cooled and condensed |
| CN201952442U (en) * | 2010-12-17 | 2011-08-31 | 中冶南方工程技术有限公司 | Gas purification tower |
| CN206033786U (en) * | 2016-09-28 | 2017-03-22 | 中冶赛迪工程技术股份有限公司 | Blast furnace gas wet process deacidification ware |
| CN208378801U (en) * | 2018-05-14 | 2019-01-15 | 中冶南方工程技术有限公司 | Gas cleaning device |
-
2020
- 2020-05-13 CN CN202020787457.2U patent/CN213113232U/en active Active
- 2020-12-29 WO PCT/CN2020/140763 patent/WO2021227521A1/en active Application Filing
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| WO2021227521A1 (en) | 2021-11-18 |
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