CN114396787A - Drying device and method for energetic material - Google Patents

Drying device and method for energetic material Download PDF

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Publication number
CN114396787A
CN114396787A CN202210072911.XA CN202210072911A CN114396787A CN 114396787 A CN114396787 A CN 114396787A CN 202210072911 A CN202210072911 A CN 202210072911A CN 114396787 A CN114396787 A CN 114396787A
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China
Prior art keywords
cavity
air
air inlet
energetic
drying
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Pending
Application number
CN202210072911.XA
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Chinese (zh)
Inventor
肖旭
李军
胡大双
苏晶
程立国
张杰凡
李坤
李彦荣
蔡海方
唐泉
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Hubei Institute of Aerospace Chemical Technology
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Hubei Institute of Aerospace Chemical Technology
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Application filed by Hubei Institute of Aerospace Chemical Technology filed Critical Hubei Institute of Aerospace Chemical Technology
Priority to CN202210072911.XA priority Critical patent/CN114396787A/en
Publication of CN114396787A publication Critical patent/CN114396787A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The scheme discloses a drying device and a drying method for an energetic material, and the drying device comprises a container with a hollow cavity, wherein a first feeding hole and an exhaust hole are formed above the cavity, a first discharging hole is formed below the cavity, and a first heating device for providing hot air into the cavity is arranged at the first discharging hole; a third heating device for heating the gas in the cavity is arranged in the cavity; wherein, the material entering the cavity through the first feed inlet is an energetic material. The device is used for drying the energetic material powder and has the characteristics of good safety, high drying efficiency and simple operation steps in the experimental process.

Description

Drying device and method for energetic material
Technical Field
The invention relates to the technical field of drying, in particular to a drying device and method for energetic materials.
Background
In the production process of energetic materials, particularly energetic materials in a powder state, the energetic materials need to be dried. At present, the main drying modes of energetic materials are oven and drying room type static drying, the drying process mainly adopts manual operation, and the outstanding problems of high operator density, large material stacking dimension, poor heat dissipation, long time consumption, low drying efficiency, high danger and the like exist. The invention relates to a drying device and a method, wherein a wet energetic powder material is dispersed into fine particles through mechanical action, and in the contact with flowing hot air, moisture is quickly vaporized and taken away by the flowing hot air, so that solid substances in the material are dried into powder, and a dried product is obtained.
Disclosure of Invention
One purpose of this scheme lies in providing a drying device for energetic material, and the device is used for the drying of energetic material powder, has that the security is good, drying efficiency is high, the operation process step is simple.
Another object of the present solution is to provide a drying method for energetic materials.
In order to achieve the purpose, the scheme is as follows:
a drying device for energetic materials comprises a container with a hollow cavity, wherein a first feeding hole and an exhaust hole are formed above the cavity, a first discharging hole is formed below the cavity, and a first heating device used for blowing hot air into the cavity is arranged at the first discharging hole;
a third heating device for heating the gas in the cavity is arranged in the cavity;
wherein, the material entering the cavity through the first feed inlet is an energetic material.
Preferably, a furnace body shell is arranged outside the container, a fireproof asbestos heat insulation layer and a third heating device are arranged between the furnace body shell and the cavity, and the third heating device is an infrared heating device.
Preferably, the device further comprises a temperature sensor for measuring the temperature inside the cavity, wherein the temperature sensor is arranged inside the cavity.
Preferably, the device also comprises a material spraying pipe for spraying the material into the cavity, an electromagnetic valve, a second heating device for heating air mixed with the energetic material and entering the cavity, and a material storage tank for storing the energetic material to be dried; the material spraying pipe is arranged at the first feed inlet; the material storage tank and the second heating device are arranged above the outside of the container, and the material storage tank is connected with the material spraying pipe through an electromagnetic valve; the second heating device is connected with the material storage tank.
Preferably, the second heating device comprises a second air heater, a second air flow meter and a second air inlet pipe;
the second air heater is connected with one end of the second air inlet pipe, and the other end of the second air inlet pipe is connected with the storage tank;
and the second air flow meter is arranged on the second air inlet pipe and is positioned between the second air heater and the storage tank.
Preferably, the first heating device comprises a first air inlet pipe, a first air heater and a first air flow meter;
one end of the first air inlet pipe is a circular air inlet pipe which is fixedly arranged below the first discharge hole, and the other end of the first air inlet pipe is connected with a first air heater; the first air flow meter is arranged on the first air inlet pipe and is positioned between the first air heater and the circular air inlet pipe;
and the air inlet circular pipe is uniformly provided with air blowing heads for blowing air to the inside of the cavity.
Preferably, the device also comprises a material collector, wherein the material collector is arranged below the air inlet circular pipe and is provided with a second feeding hole and a second discharging hole, and the second feeding hole is matched with the first discharging hole below the cavity;
the material collector is funnel-shaped.
Preferably, a metal part for conducting static electricity is provided in the material collector.
Preferably, the metal part comprises a metal net arranged in the material collector and a static conducting copper wire, one end of the static conducting copper wire is connected with the metal net, and the other end of the static conducting copper wire is grounded.
In a second aspect, a method for drying an energetic material is provided, and the method for drying the energetic material by using the drying device comprises the following steps:
heating the air in the cavity to a set temperature range through a third heating device;
continuously blowing air heated by the first heating device outside the container into the cavity from the lower part of the container;
mixing the air heated by the second heating device outside the container with the energetic material in the storage tank, and spraying the mixture into the cavity in a spraying manner;
the dried energetic material is discharged from the container through a first discharge port.
The scheme has the following beneficial effects:
aiming at the problem of low drying efficiency of the existing energetic material static accumulation, the scheme provides a drying device and a drying method suitable for energetic material powder. Atomization is realized by mixing the materials with hot air, the atomized materials pass through a high-temperature cavity, and moisture is taken away by drying the hot air, so that the materials are dried.
Drawings
In order to illustrate the implementation of the solution more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the solution, and that other drawings may be derived from these drawings by a person skilled in the art without inventive effort.
FIG. 1 is a schematic view of a drying apparatus;
FIG. 2 is a schematic top view of portion A-A of FIG. 1;
FIG. 3 is a schematic view of an electrostatic conductive metal mesh;
wherein, 1-furnace body shell; 2-a fire-resistant asbestos insulation layer; 3-an infrared heating device; 4-a first air inlet pipe; 401-air inlet circular pipe; 402-a blowing head; 5-a first air heater; 6-a first air flow meter; 7-a metal mesh; 8-a material collector; 9-electrostatic conducting copper wire; 10-a temperature control system; 11-a temperature sensor; 12-a cavity; 13-spraying a material pipe; 14-an exhaust pipe; 15-a dust remover; 16-a solenoid valve; 17-a material storage tank; 18-a second air inlet pipe; 19-a second air flow meter; 20-a second air heater; 21-exhaust port.
Detailed Description
Embodiments of the present solution are described in further detail below. It is clear that the described embodiments are only a part of the embodiments of the present solution, and not an exhaustive list of all embodiments. It should be noted that, in the present embodiment, features of the embodiment and the embodiment may be combined with each other without conflict.
The terms first, second and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically 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.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The inventor of the application provides a novel drying device for energetic materials, aiming at the problems of potential safety hazard, low drying efficiency and complex operation steps in the process of drying the energetic materials. The device is used for drying the energetic material powder, and has the characteristics of good safety, high drying efficiency and simple operation process steps in a laboratory. The scheme also provides a drying method of the energetic material.
The technical scheme adopted by the scheme is as follows: the utility model provides a drying device for energetic material, includes furnace body shell, furnace body shell upper end is equipped with solenoid valve, storage tank and second air-supply line, the second air-supply line is connected with second air flow meter and second air heater, even there are dust remover and blast pipe furnace body shell upper end, furnace body shell lower extreme even has leads the static copper wire, furnace body shell lower extreme is equipped with first discharge gate, be equipped with fire-resistant asbestos heat preservation, infrared heating device and cavity in the furnace body shell, the cavity below is connected with first air-supply line and blowing head, first air-supply line is connected with first air flow meter and first air heater, the cavity below is equipped with leads the static metal mesh, the inside temperature sensor that is equipped with of cavity, temperature sensor links to each other with temperature control system.
Compared with the prior art, the scheme mainly has the following advantages:
1. the operation is simple, and the drying operation can be started after the temperature of the cavity is raised to the preset temperature;
2. the material accumulation amount is small, and the danger is small;
3. the drying time is short, the efficiency is high, and compared with the drying in an oven or a drying room, the drying time is shortened to the second level.
The present invention will be described in detail with reference to specific examples.
As shown in fig. 1 to 3, a drying device for energetic materials comprises a container with a hollow cavity 12, a furnace body casing 1 is arranged outside the container, a refractory asbestos heat-insulating layer 2 and an infrared heating device 3 are arranged between the furnace body casing 1 and the cavity 12, a first feeding hole and an exhaust hole 21 are arranged above the cavity 12, and a material spraying pipe 13 for spraying materials to be dried into the cavity 12 is arranged at the first feeding hole; a first discharge hole is formed below the container, and a first heating device for providing hot air to the cavity 12 is arranged outside the furnace body shell 1 at the first discharge hole; the first heating device heats the air and blows the hot air into the cavity 12 through the first discharge hole; the cavity 12 is also internally provided with a third heating device for heating air in the cavity, in the embodiment, the third heating device which is arranged in the cavity and used for heating the air is the infrared heating device 3; before the energetic material is dried, an infrared heating device is started to heat the air in the cavity 12 to a set temperature range and keep the temperature; the energy-containing material enters the cavity 12 through the material spraying pipe 13 arranged at the first feeding port in a spraying mode, the temperature sensor 11 is further arranged inside the cavity 12, and the temperature sensor 11 is connected with the external temperature control system 10.
In the present embodiment, a dust separator 15 and an exhaust pipe 14 connected to each other are provided at the exhaust port 21.
The device also comprises a second heating device and a storage tank 17, wherein the second heating device is used for heating air mixed with the energetic material and entering the cavity 12, and the storage tank 17 is used for storing the energetic material to be dried; storage tank 17 and second heating device all locate the outside top of container, and storage tank 17 passes through solenoid valve 16 and is connected with first feed inlet, and second heating device is connected with storage tank 17.
The first heating device comprises a first air inlet pipe 4, a first air heater 5 and a first air flow meter 6; one end of the first air inlet pipe 4 is a circular air inlet circular pipe 401, the circular air inlet circular pipe 401 is arranged below the first discharge hole of the cavity 12, and the circular air inlet circular pipe 401 is matched with the first discharge hole below the cavity 12 in size; the other end of the first air inlet pipe 4 is connected with a first air heater 5; the first air flow meter 6 is arranged on the first air inlet pipe 4; and is positioned between the first air heater 5 and the circular air inlet pipe 401; in this embodiment, preferably, the air intake circular tube 401 is uniformly provided with air blowing heads 402 blowing air into the cavity 12.
The device still includes material collector 8, and material collector 8 is lou hopper-shaped, including second feed inlet and second discharge gate, material collector 8 sets firmly in air inlet pipe 401 below, the second feed inlet of material collector 8 and the first discharge gate adaptation of cavity 12 below. The second heating device comprises a second air heater 20, a second air flow meter 19 and a second air inlet pipe 18, the second air heater 20 is connected with one end of the second air inlet pipe 18, and the other end of the second air inlet pipe 18 is connected with the storage tank 17; a second air flow meter 19 is disposed on the second air inlet pipe 18 and between the second air heater 20 and the storage tank 17.
In this embodiment, the energetic material is a powdery material, the energetic material is stored in the storage tank 17 before entering the chamber 12, the second air heater 20 heats the air to a set temperature, and the hot air flow rate is set to a suitable range by the second air flow meter 19. And the electromagnetic valve 16 is opened, the energetic materials to be dried stored in the storage tank 17 are mixed with hot air in the second air inlet pipe 18, and the mixed materials are atomized into the cavity 12 through the material spraying pipe 13. Meanwhile, hot air enters the interior of the cavity 12 through the blowing head 402 connected to the first air inlet duct 4, and is blown upward from the bottom of the cavity 12; inside the chamber 12, the exhaust gas is exhausted from the exhaust pipe 14 through the dust collector 15, and the energetic materials are dried and exhausted from the drying device through the first outlet, the second inlet and the second outlet of the material collector 8.
A metal part for conducting static electricity is arranged below the second feeding hole in the material collector 8; the metal part comprises a metal mesh 7 and a static conductive copper wire 9, wherein the metal mesh 7 is arranged in the material collector 8 and is positioned below the second feed inlet, the static conductive copper wire is used for conducting static electricity, one end of the static conductive copper wire is connected with the metal mesh 7, and the other end of the static conductive copper wire is grounded.
In one embodiment, the energetic material is wet Ammonium Perchlorate (AP), and the drying process of the wet Ammonium Perchlorate (AP) by the drying device is as follows:
the temperature sensor 11 and the temperature control system 10 control the infrared heating device 3 to heat the air in the cavity 12 to 140 ℃ and then keep the temperature;
setting the first air heater 5, heating the air temperature to 140 ℃, and setting the hot air flow rate to an appropriate range by the first air flow meter 6, and likewise, setting the second air heater 20, heating the air temperature to 140 ℃, and setting the hot air flow rate to an appropriate range by the second air flow meter 19;
wet Ammonium Perchlorate (AP) to be dried in the storage tank 17 and hot air transmitted through the second air inlet pipe 18 are mixed through the electromagnetic valve 16 and then atomized into the cavity 12 through the material spraying pipe 13; meanwhile, hot air is blown into the cavity from the bottom of the cavity 12 upwards through the blowing head 402 connected with the first air inlet pipe 4, the waste gas is discharged from the exhaust pipe 14 through the dust remover 15, and then the dried wet Ammonium Perchlorate (AP) is dried, and the dried energy-containing Ammonium Perchlorate (AP) is collected through the material collector 8.
In another embodiment, the energetic material is wet cyclonite (RDX), and the drying of the wet cyclonite (RDX) by the drying device is as follows:
the temperature sensor 11 and the temperature control system 10 control the infrared heating device 3 to heat the air in the cavity 12 to 80 ℃ and then keep the temperature;
setting the first air heater 5, heating the air temperature to 80 ℃, and setting the hot air flow rate to an appropriate range by the first air flow meter 6, and likewise, setting the second air heater 20, heating the air temperature to 80 ℃, and setting the hot air flow rate to an appropriate range by the second air flow meter 19;
the wet ammonium perchlorate AP to be dried in the storage tank 17 and the hot air transmitted through the second air inlet pipe 18 are mixed by the electromagnetic valve 16 and then atomized into the cavity 12 through the material spraying pipe 13; meanwhile, hot air is blown into the cavity from the bottom of the cavity 12 upwards through a blowing head 402 connected with the first air inlet pipe 4, waste gas is exhausted from the exhaust pipe 14 through the dust remover 15, wet cyclonite (RDX) is dried, and dry energetic material cyclonite (RDX) is collected through the material collector 8.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.

Claims (10)

1. The drying device for the energetic material is characterized by comprising a container with a hollow cavity (12), wherein a first feeding hole and an exhaust hole (21) are formed above the cavity (12), a first discharging hole is formed below the cavity (12), and a first heating device for blowing hot air into the cavity (12) is arranged at the first discharging hole;
a third heating device for heating gas in the cavity is arranged in the cavity (12);
wherein the material entering the cavity (12) through the first feed inlet is energetic material.
2. The drying device for energetic materials according to claim 1, characterized in that a furnace body shell (1) is arranged outside the container, a refractory asbestos insulation layer (2) and a third heating device are arranged between the furnace body shell (1) and the cavity (12), and the third heating device is an infrared heating device (3).
3. Drying apparatus for energetic materials according to claim 1, characterised in that it further comprises a temperature sensor (11) for measuring the temperature inside the chamber, said temperature sensor (11) being provided inside said chamber (12).
4. The drying apparatus for energetic materials according to claim 1, further comprising a spray pipe (13) for spraying the material into the cavity, a solenoid valve (16), a second heating means for heating the air mixed with the energetic material into the cavity and a storage tank (17) for storing the energetic material to be dried; the material spraying pipe (13) is arranged at the first feed inlet; the storage tank (17) and the second heating device are arranged above the outside of the container, and the storage tank (17) is connected with the material spraying pipe (13) through an electromagnetic valve (16); the second heating device is connected with the material storage tank (17).
5. Drying apparatus for energetic materials according to claim 4, characterised in that the second heating means comprise a second air heater (20), a second air flow meter (19) and a second air inlet duct (18);
the second air heater (20) is connected with one end of the second air inlet pipe (18), and the other end of the second air inlet pipe (18) is connected with the storage tank (17);
the second air flow meter (19) is arranged on the second air inlet pipe (18) and is positioned between the second air heater (20) and the storage tank (17).
6. Drying apparatus for energetic materials according to claim 1, characterised in that the first heating means comprise a first air inlet duct (4), a first air heater (5) and a first air flow meter (6);
one end of the first air inlet pipe (4) is a circular air inlet circular pipe (401), the circular air inlet circular pipe (401) is fixedly arranged below the first discharge hole, and the other end of the first air inlet pipe (4) is connected with a first air heater (5); the first air flow meter (6) is arranged on the first air inlet pipe (4) and is positioned between the first air heater (5) and the circular air inlet pipe (401);
and the air inlet circular pipe (401) is uniformly provided with air blowing heads (402) used for blowing air into the cavity (12).
7. The drying device for the energetic material according to claim 6, further comprising a material collector (8), wherein the material collector (8) is arranged below the air inlet circular pipe (401), the material collector (8) is provided with a second feeding hole and a second discharging hole, and the second feeding hole is matched with the first discharging hole below the cavity (12);
the material collector (8) is funnel-shaped.
8. Drying apparatus for energetic materials according to claim 7, characterised in that metallic means for conducting static electricity are provided in the material collector (8).
9. The drying device for energetic materials according to claim 8, characterized in that the metal parts comprise a metal mesh (7) arranged inside the material collector (8) and an electrostatic conducting copper wire (9) connected with the metal mesh (7) at one end and grounded at the other end.
10. A method for drying an energetic material, characterized in that the drying device according to any one of claims 1 to 9 is used for drying the energetic material, comprising the following steps:
heating the air in the cavity to a set temperature range through a third heating device;
continuously blowing air heated by the first heating device outside the container into the cavity from the lower part of the container;
mixing the air heated by the second heating device outside the container with the energetic material in the storage tank, and spraying the mixture into the cavity in a spraying manner;
and discharging the dried energetic material through a first discharge hole, a second feed hole and a second discharge hole.
CN202210072911.XA 2022-01-21 2022-01-21 Drying device and method for energetic material Pending CN114396787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210072911.XA CN114396787A (en) 2022-01-21 2022-01-21 Drying device and method for energetic material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210072911.XA CN114396787A (en) 2022-01-21 2022-01-21 Drying device and method for energetic material

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CN114396787A true CN114396787A (en) 2022-04-26

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187617A (en) * 1978-12-18 1980-02-12 Becker James J Jr Spray dryer
JP2009103398A (en) * 2007-10-25 2009-05-14 Bohen-Kasei Co Ltd Vacuum spray dryer
CN208282583U (en) * 2018-06-01 2018-12-25 长沙航空职业技术学院 Spray-drying installation is used in a kind of preparation of nano material
CN109631499A (en) * 2018-12-19 2019-04-16 西安近代化学研究所 A kind of quick continuous drying technique of insensitive energetic material
CN210521798U (en) * 2019-09-06 2020-05-15 维沃泰克仪器(扬州)有限公司 Far infrared spray drier
CN210689130U (en) * 2019-08-23 2020-06-05 湖北盛世华沣陶瓷有限公司 Spray drying tower
CN211695679U (en) * 2020-02-27 2020-10-16 湖北航天化学技术研究所 Sack vibration drying device
CN113577806A (en) * 2021-08-11 2021-11-02 中北大学 Spray drying bed for preparing energetic material and method for preparing energetic material by using spray drying bed

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4187617A (en) * 1978-12-18 1980-02-12 Becker James J Jr Spray dryer
JP2009103398A (en) * 2007-10-25 2009-05-14 Bohen-Kasei Co Ltd Vacuum spray dryer
CN208282583U (en) * 2018-06-01 2018-12-25 长沙航空职业技术学院 Spray-drying installation is used in a kind of preparation of nano material
CN109631499A (en) * 2018-12-19 2019-04-16 西安近代化学研究所 A kind of quick continuous drying technique of insensitive energetic material
CN210689130U (en) * 2019-08-23 2020-06-05 湖北盛世华沣陶瓷有限公司 Spray drying tower
CN210521798U (en) * 2019-09-06 2020-05-15 维沃泰克仪器(扬州)有限公司 Far infrared spray drier
CN211695679U (en) * 2020-02-27 2020-10-16 湖北航天化学技术研究所 Sack vibration drying device
CN113577806A (en) * 2021-08-11 2021-11-02 中北大学 Spray drying bed for preparing energetic material and method for preparing energetic material by using spray drying bed

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Application publication date: 20220426