CN114686286A - Method for reducing corrosion degree of heating surface of biomass boiler - Google Patents
Method for reducing corrosion degree of heating surface of biomass boiler Download PDFInfo
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- CN114686286A CN114686286A CN202210339256.XA CN202210339256A CN114686286A CN 114686286 A CN114686286 A CN 114686286A CN 202210339256 A CN202210339256 A CN 202210339256A CN 114686286 A CN114686286 A CN 114686286A
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- Prior art keywords
- biomass
- acid
- washed
- heating surface
- boiler
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- 239000002028 Biomass Substances 0.000 title claims abstract description 116
- 238000005260 corrosion Methods 0.000 title claims abstract description 42
- 230000007797 corrosion Effects 0.000 title claims abstract description 42
- 238000010438 heat treatment Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002253 acid Substances 0.000 claims abstract description 32
- 239000000446 fuel Substances 0.000 claims abstract description 32
- 238000002485 combustion reaction Methods 0.000 claims abstract description 21
- 238000005406 washing Methods 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- 239000012298 atmosphere Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 10
- 239000000460 chlorine Substances 0.000 abstract description 10
- 229910052801 chlorine Inorganic materials 0.000 abstract description 10
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052700 potassium Inorganic materials 0.000 abstract description 7
- 239000011591 potassium Substances 0.000 abstract description 7
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 6
- 229910052573 porcelain Inorganic materials 0.000 description 6
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- -1 alkali metal salts Chemical class 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 description 2
- 235000011151 potassium sulphates Nutrition 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/06—Heat exchange, direct or indirect
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/545—Washing, scrubbing, stripping, scavenging for separating fractions, components or impurities during preparation or upgrading of a fuel
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention provides a method for reducing the corrosion degree of a heating surface of a biomass boiler, which comprises the following steps of 1, dispersing biomass in an acid solution for acid washing operation, and obtaining acid-washed biomass after filtering and drying; step 2, baking the acid-washed biomass obtained in the step 1, and cooling the baked acid-washed biomass to obtain acid-washed-baked biomass fuel; and 3, carrying the acid-washed and baked biomass fuel obtained in the step 2 through airflow, sequentially passing through a crusher, a coarse-fine separator and a burner, and then feeding the biomass fuel into a hearth for combustion, so that the corrosion degree of the heating surface of the biomass boiler is reduced. The acid washing-baking operation can effectively remove potassium element and chlorine element in the biomass, and reduce the generation of potassium salt and the release of chlorine-containing gas in the biomass combustion process, thereby reducing the corrosion degree of the heating surface of the biomass boiler.
Description
Technical Field
The invention relates to the technical field of biomass boilers, in particular to a method for reducing the corrosion degree of a heating surface of a biomass boiler.
Background
The solid biomass can cause serious corrosion problem to the heating surface of the boiler in the combustion process. The corrosion of the heating surface of the boiler has obvious irreversibility, and the deepening of the corrosion degree can cause the serious consequences of the reduction of the metal thickness of the heating surface, the reduction of the service life of the boiler, the tube explosion of the boiler and the like.
At present, a control means for the corrosion problem of the biomass boiler is mainly to spray a corrosion-resistant coating on a heated surface of the boiler, and although the mode has a certain corrosion-resistant effect, the problems that the coating surface is easy to fall off, the service life is short, the thermal efficiency of the boiler is reduced and the like exist. It is of great importance to find a way to further reduce the corrosion problems of biomass boilers from the fuel side.
Disclosure of Invention
Aiming at the phenomenon that the corrosion degree of the biomass boiler cannot be further reduced in the prior art, the invention provides a method for reducing the corrosion degree of the heating surface of the biomass boiler, and the effect of reducing the corrosion degree of the heating surface of the biomass boiler is achieved by a combined mode of acid washing and baking.
The invention is realized by the following technical scheme:
a method for reducing the corrosion degree of a heating surface of a biomass boiler comprises the following steps:
step 1, dispersing biomass in an acid solution for acid washing operation, and filtering and drying to obtain acid-washed biomass;
step 2, baking the acid-washed biomass obtained in the step 1, and cooling the baked acid-washed biomass to obtain acid-washed-baked biomass fuel;
and 3, carrying the acid-washed and baked biomass fuel obtained in the step 2 through airflow, sequentially passing through a crusher, a coarse-fine separator and a burner, and then feeding the biomass fuel into a hearth for combustion, so that the corrosion degree of the heating surface of the biomass boiler is reduced.
Preferably, in step 1, acetic acid, hydrochloric acid or sulfuric acid is used as the acid solution.
Preferably, in step 1, the concentration of the acid solution is 6-10 mol/L.
Preferably, in step 1, the solid-liquid mixing ratio of the biomass to the acid solution is (10-50) g:1000 ml.
Preferably, in step 1, the biomass is dispersed in an acid solution for an acid washing operation, wherein the acid washing time is 12-24 h.
Preferably, in step 1, filtering and drying are performed after the biomass acid washing operation to obtain acid-washed biomass, wherein the drying time is 12-24 h.
Preferably, in the step 2, the acid-washed biomass is subjected to a baking operation, wherein the baking temperature is 250-500 ℃, the baking time is 20-40min, and the baking atmosphere is an inert atmosphere.
Preferably, in the step 3, the particle size threshold of the rough and fine separator is 1000-.
Preferably, in step 3, the combustion temperature of the acid-washed-baked biomass fuel entering the boiler is 700-1200 ℃.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a method for reducing the corrosion degree of a heating surface of a biomass boiler, wherein the contents of potassium and chlorine elements in biomass are high, potassium chloride generated in the combustion process of the potassium element and alkali metal salts such as potassium sulfate can generate solid-phase corrosion on the heating surface of the boiler, and chlorine can generate highly corrosive chlorine-containing gas in the combustion process, so that gas-phase corrosion can be generated on the heating surface of the boiler. The acid washing operation of the biomass before combustion can remove most of potassium element and chlorine element in the biomass, so that the corrosion degree of the biomass on the heating surface of the boiler in the combustion process can be reduced.
On one hand, the baking can improve the fuel quality, and improve fuel characteristics such as hydrophobicity, grindability and low-order calorific value of the biomass, so that the utilization rate of the biomass is improved, the utilization difficulty and cost of the biomass are reduced, and the promotion degree of the fuel characteristics of the pickled biomass in the baking process is more obvious.
Drawings
FIG. 1 is a flow chart of a method for reducing corrosion on a heated surface of a biomass boiler according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, in an embodiment of the present invention, a method for reducing corrosion of a heated surface of a biomass boiler is provided, and an effect of reducing corrosion of the biomass boiler is achieved by a combination of acid washing and baking.
Specifically, the method for reducing the corrosion degree of the heating surface of the biomass boiler comprises the following steps:
step 1, dispersing biomass in an acid solution for acid washing operation, and filtering and drying to obtain acid-washed biomass;
specifically, the acid solution is acetic acid, hydrochloric acid or sulfuric acid.
Specifically, the concentration of the acid solution is 6-10 mol/L.
Specifically, the solid-liquid mixing ratio of the biomass to the acid solution is (10-50) g:1000 ml.
Specifically, the biomass is dispersed in an acid solution for acid washing operation, wherein the acid washing time is 12-24 h.
Specifically, filtering and drying are carried out after the biomass acid washing operation to obtain acid-washed biomass, wherein the drying time is 12-24 h.
Step 2, baking the acid-washed biomass obtained in the step 1, and cooling the baked acid-washed biomass to obtain acid-washed and baked biomass fuel;
specifically, the acid-washed biomass is subjected to baking operation, wherein the baking temperature is 250-500 ℃, the baking time is 20-40min, and the baking atmosphere is inert atmosphere.
And 3, carrying the acid-washed and baked biomass fuel obtained in the step 2 through airflow, sequentially passing through a crusher, a coarse-fine separator and a burner, and then feeding the biomass fuel into a hearth for combustion, so that the corrosion degree of the heating surface of the biomass boiler is reduced.
Specifically, the particle size threshold of the coarse-fine separator is 1000-.
Specifically, the combustion temperature of the acid-washing-baking biomass fuel entering the boiler is 700-1200 ℃.
Example 1
(1) Dispersing biomass in 6mol/L acetic acid solution according to the proportion of 10g to 1000ml to obtain a solid-liquid mixture;
(2) stirring the solid-liquid mixture obtained in the step (1) for 12 hours and then carrying out filtration operation;
(3) drying the solid obtained in the step (2) for 12 hours to obtain acid-washed biomass;
(4) flatly paving the acid-washed biomass in the periphery of the porcelain, and then placing the ceramic in a reactor at 250 ℃ for baking for 40min, wherein the baking atmosphere is nitrogen atmosphere;
(5) after baking is finished, cooling the porcelain to obtain acid-washing and baking biomass fuel;
(6) and (3) carrying the biomass fuel obtained in the step (5) by airflow, sequentially passing through a crusher, a coarse-fine separator with a threshold value of 1000 microns and a burner, and then feeding the biomass fuel into a 700-DEG C hearth for combustion, so as to reduce the corrosion degree of the heating surface of the biomass boiler.
Example 2
(1) Dispersing biomass into 8mol/L hydrochloric acid solution according to the proportion of 35g to 1000ml to obtain a solid-liquid mixture;
(2) stirring the solid-liquid mixture obtained in the step (1) for 18 hours, and then carrying out filtration operation;
(3) drying the solid obtained in the step (2) for 18h to obtain acid-washed biomass;
(4) flatly paving the acid-washed biomass in the periphery of the porcelain, and then placing the ceramic in a reactor at 350 ℃ for baking for 30min, wherein the baking atmosphere is nitrogen atmosphere;
(5) after baking is finished, cooling the porcelain to obtain acid-washing and baking biomass fuel;
(6) and (3) carrying the biomass fuel obtained in the step (5) by airflow, sequentially passing through a crusher, a coarse-fine separator with a threshold value of 1500 mu m and a burner, and then feeding the biomass fuel into a hearth at 900 ℃ for combustion, so as to reduce the corrosion degree of the heating surface of the biomass boiler.
Example 3
(1) Dispersing biomass in 10mol/L sulfuric acid solution according to the proportion of 50g to 1000ml to obtain a solid-liquid mixture;
(2) stirring the solid-liquid mixture obtained in the step (1) for 24 hours, and then carrying out filtration operation;
(3) drying the solid obtained in the step (2) for 24 hours to obtain acid-washed biomass;
(4) flatly paving the acid-washed biomass in the periphery of the porcelain, and then placing the ceramic in a reactor at 500 ℃ for baking for 20min, wherein the baking atmosphere is nitrogen atmosphere;
(5) after baking is finished, cooling the porcelain to obtain acid-washing-baking biomass fuel;
(6) and (4) carrying the biomass fuel obtained in the step (5) by airflow, sequentially passing through a crusher, a coarse-fine separator with a threshold value of 2000 mu m and a burner, and then sending into a hearth at 1200 ℃ for combustion, so that the corrosion degree of the heated surface of the biomass boiler is reduced.
In summary, the biomass has high contents of potassium and chlorine elements, potassium chloride and alkali metal salts such as potassium sulfate generated in the combustion process of the potassium element can generate solid-phase corrosion on the heating surface of the boiler, and chlorine element can generate highly corrosive chlorine-containing gas in the combustion process, so that gas-phase corrosion can be generated on the heating surface of the boiler. The biomass is subjected to acid washing operation before combustion, so that most of potassium elements and chlorine elements in the biomass can be removed, and the corrosion degree of the biomass on a heating surface of a boiler in the combustion process can be reduced.
On one hand, the baking can improve the fuel quality, and improve fuel characteristics such as hydrophobicity, grindability and low-order calorific value of the biomass, so that the utilization rate of the biomass is improved, the utilization difficulty and cost of the biomass are reduced, and the promotion degree of the fuel characteristics of the pickled biomass in the baking process is more obvious.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (9)
1. A method for reducing the corrosion degree of a heating surface of a biomass boiler is characterized by comprising the following steps:
step 1, dispersing biomass in an acid solution for acid washing operation, and filtering and drying to obtain acid-washed biomass;
step 2, baking the acid-washed biomass obtained in the step 1, and cooling the baked acid-washed biomass to obtain acid-washed and baked biomass fuel;
and 3, carrying the acid-washed and baked biomass fuel obtained in the step 2 through airflow, sequentially passing through a crusher, a coarse-fine separator and a burner, and then feeding the biomass fuel into a hearth for combustion, so that the corrosion degree of the heating surface of the biomass boiler is reduced.
2. The method for reducing the corrosion degree of the heating surface of the biomass boiler as claimed in claim 1, wherein in the step 1, the acid solution is acetic acid, hydrochloric acid or sulfuric acid.
3. The method for reducing the corrosion degree of the heating surface of the biomass boiler as claimed in claim 1, wherein in the step 1, the concentration of the acid solution is 6-10 mol/L.
4. The method for reducing the corrosion degree of the heating surface of the biomass boiler as claimed in claim 1, wherein in the step 1, the solid-liquid mixing ratio of the biomass and the acid solution is (10-50) g:1000 ml.
5. The method for reducing the corrosion degree of the heating surface of the biomass boiler as claimed in claim 1, wherein in the step 1, the biomass is dispersed in the acid solution to perform the pickling operation, wherein the pickling time is 12-24 h.
6. The method for reducing the corrosion degree of the heating surface of the biomass boiler as claimed in claim 1, wherein in the step 1, the biomass is filtered and dried after the acid washing operation to obtain the acid-washed biomass, wherein the drying time is 12-24 h.
7. The method as claimed in claim 1, wherein in step 2, the acid-washed biomass is subjected to a baking operation, wherein the baking temperature is 250-500 ℃, the baking time is 20-40min, and the baking atmosphere is an inert atmosphere.
8. The method for reducing the corrosion degree of the heating surface of the biomass boiler as recited in claim 1, wherein in the step 3, the particle size threshold of the rough-fine separator is 1000-2000 μm, and when the particle size of the acid-washed-baked biomass fuel is lower than the threshold of the rough-fine separator, the acid-washed-baked biomass fuel enters the boiler for combustion.
9. The method for reducing the corrosion degree of the heating surface of the biomass boiler as claimed in claim 1, wherein in the step 3, the combustion temperature of the acid-washed-and-baked biomass fuel entering the boiler is 700-1200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210339256.XA CN114686286A (en) | 2022-04-01 | 2022-04-01 | Method for reducing corrosion degree of heating surface of biomass boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210339256.XA CN114686286A (en) | 2022-04-01 | 2022-04-01 | Method for reducing corrosion degree of heating surface of biomass boiler |
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| CN114686286A true CN114686286A (en) | 2022-07-01 |
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| CN202210339256.XA Pending CN114686286A (en) | 2022-04-01 | 2022-04-01 | Method for reducing corrosion degree of heating surface of biomass boiler |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208649247U (en) * | 2018-05-16 | 2019-03-26 | 南京林业大学 | A kind of shaped fuel processing system improving biomass ash fusion point and calorific value |
| CN114015489A (en) * | 2021-11-16 | 2022-02-08 | 西安热工研究院有限公司 | Method for relieving coal combustion contamination problem by using modified herbaceous biomass coke |
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- 2022-04-01 CN CN202210339256.XA patent/CN114686286A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208649247U (en) * | 2018-05-16 | 2019-03-26 | 南京林业大学 | A kind of shaped fuel processing system improving biomass ash fusion point and calorific value |
| CN114015489A (en) * | 2021-11-16 | 2022-02-08 | 西安热工研究院有限公司 | Method for relieving coal combustion contamination problem by using modified herbaceous biomass coke |
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Application publication date: 20220701 |