Superfine dry powder extinguishing agent and preparation method thereof

Abstract

The invention belongs to the technical field of fire extinguishing agents, and particularly relates to a superfine dry powder fire extinguishing agent and a preparation method thereof.The superfine dry powder fire extinguishing agent is prepared from, by mass, 7-10 parts of alkaline residues, 30-40 parts of sodium bicarbonate, 0.5-1 part of talcum powder, 5-8 parts of marlstone, 1-3 parts of xonotlite, 30-45 parts of ammonium sulfate, 3-7 parts of ammonium polyphosphate, 10-20 parts of gypsum, 1-4 parts of tin oxide, 2-5 parts of silicon nitride, 1-2 parts of silicone oil and 0.4-0.6 part of polybutylene. The prepared product is good in fluidity and hydrophobicity, high in caking resistance and high in fire extinguishing performance, and the fire extinguishing time is shortened.

Description

Technical Field

[0001] This invention belongs to the field of fire extinguishing agent technology, and particularly relates to an ultrafine dry powder fire extinguishing agent and its preparation method. Background Technology

[0002] Dry powder fire extinguishing agent is a dry, free-flowing, finely ground solid powder primarily used for fire extinguishing. It is made by grinding a mixture of extinguishing base materials (such as baking soda, ammonium carbonate, and ammonium carbonate salts) with appropriate amounts of lubricants (such as magnesium stearate, mica powder, and talc powder) and a small amount of moisture-proofing agent (such as silica gel). These finely ground powder particles, once sprayed, quickly cover the surface of the burning material, forming an insulating layer that hinders combustion. Simultaneously, they release non-combustible gases, reducing the oxygen concentration and thus achieving the fire extinguishing effect.

[0003] Ultrafine dry powder fire extinguishing agent is a type of ultrafine powder fire extinguishing agent with high fire extinguishing efficiency, dryness, and easy flowability. It mainly consists of active fire extinguishing components, pulverizing aid components, hydrophobic components, and inert filler components. Among these, the fire extinguishing component is the core of the ultrafine dry powder fire extinguishing agent, and the other components function around this core. Its fire extinguishing principle is mainly as follows: First, the volatile decomposition products of inorganic salts in the powder react chemically with free radicals or active groups produced by the fuel during combustion, causing chemical inhibition and secondary catalysis, thus interrupting the chain reaction of combustion and extinguishing the fire. Second, the fine powder falls onto the surface of the burning material and forms a glassy covering layer under high temperature, thereby isolating oxygen and suffocating the fire. Therefore, suffocation, cooling, radiation shielding, and chemical inhibition of flaming combustion are the concentrated manifestations of the fire extinguishing efficiency of ultrafine dry powder fire extinguishing agents. At the same time, due to the very small particle size of ultrafine dry powder fire extinguishing agents, it has a wider coverage area and stronger adhesion for the same mass. In recent years, with the increasingly mature production process of ultrafine dry powder fire extinguishing agents, their fire extinguishing performance has been greatly improved, and the range of fire locations and types to which they can be applied has become increasingly wide.

[0004] Some ultrafine dry powder fire extinguishing agents are prone to absorbing moisture and clumping, which can cause them to become ineffective. Therefore, it is necessary to improve the formulation and preparation process of fire extinguishing agents to ensure their fire extinguishing efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned technical problems by providing an ultrafine dry powder fire extinguishing agent and its preparation method, achieving the effects of good product flowability and hydrophobicity, strong anti-caking properties, strong fire extinguishing performance, and shortened fire extinguishing time.

[0006] In view of this, the present invention provides an ultrafine dry powder fire extinguishing agent and a method for preparing the same, comprising: An ultrafine dry powder fire extinguishing agent comprises the following raw materials in parts by weight: 7-10 parts alkali slag, 30-40 parts sodium bicarbonate, 0.5-1 parts talc, 5-8 parts marl, 1-3 parts calcium silicate, 30-45 parts ammonium sulfate, 3-7 parts ammonium polyphosphate, 10-20 parts gypsum, 1-4 parts tin oxide, 2-5 parts silicon nitride, 1-2 parts silicone oil, and 0.4-0.6 parts polybutene.

[0007] In this technical solution, the produced product has good flowability and hydrophobicity, strong anti-caking properties, strong fire extinguishing performance, and shortens the fire extinguishing time.

[0008] Furthermore, the silicone oil is a mixture of dimethyl hydroxy silicone oil and hydrogen-containing silicone oil, with a volume ratio of 1:3-5.

[0009] Furthermore, the preparation method of the ultrafine dry powder fire extinguishing agent includes the following steps: S1: After crushing the alkali residue, marl, hard silicate and gypsum through a 100-200 mesh sieve, put them into a grinder and grind for 80-160 minutes before discharging; S2: Take 40% sodium bicarbonate and 50% ammonium sulfate by weight and place them in a mixer. Add talc, ammonium polyphosphate, tin oxide, silicon nitride and the final product prepared in step (1). Stir for 35-45 minutes. Then add the remaining 60% sodium bicarbonate and 50% ammonium sulfate by weight and continue stirring for 25-35 minutes. While stirring, heat to 55-65℃ and keep the temperature constant to obtain a mixture. S3: Stir the silicone oil, polybutene and water evenly. The volume ratio of silicone oil to water is 1:1-1.5. After atomization, spray it into the mixture prepared in step (2), stir for 80 minutes and then discharge it into the dryer to dry for 2 hours at a drying temperature of 110-120℃. Cool it down. S4: Crush and sieve the final product prepared in step (3) until the particle size is less than 10μm to obtain the fire extinguishing agent.

[0010] Furthermore, the dryer includes: A drying kettle, which is used to contain powder, is provided with a feed inlet and a discharge outlet; A stirring assembly is installed inside a drying kettle and is used to stir the powder in the drying kettle. A heating component is used to increase the temperature inside the drying kettle to dry the powder. A dehumidification component is used to remove moisture from the high-temperature and high-humidity gas in the drying kettle. The dehumidification component is equipped with a dust removal structure, which is used to separate the powder carried in the gas entering the dehumidification component.

[0011] In this technical solution, the powder to be dried is fed into the drying kettle through the feed inlet. The stirring component agitates the powder in the drying kettle, the heating component raises the temperature inside the drying kettle to dry the powder, and the dehumidification component removes moisture from the high-temperature, high-humidity gas inside the drying kettle, thereby achieving the drying of the powder. The ash removal structure can separate the powder carried in the gas entering the dehumidification component, preventing powder from depositing inside the dehumidification component and ensuring the drying efficiency and service life of the dryer.

[0012] Furthermore, the dehumidification component includes: A dehumidification pipe, wherein the inlet end of the dehumidification pipe is connected to the side of the drying kettle, the outlet end is connected to the top of the drying kettle, and the dehumidification pipe is connected to the inner cavity of the drying kettle; A fan is installed in the dehumidification duct, and the fan is used to draw other substances in the dehumidification duct from the inlet end to the outlet end. A condenser is used to condense water vapor in the gas entering the dehumidification assembly; A moisture-absorbing component is used to absorb water vapor from the gas entering the dehumidification component.

[0013] In this technical solution, the condensation of the condenser and the moisture absorption of the moisture absorption component can basically remove water vapor from the gas, thus achieving the purpose of drying.

[0014] Furthermore, the moisture-absorbing component includes: A moisture absorption chamber is disposed inside a dehumidification pipe; The moisture-absorbing wheel is rotatably mounted inside the moisture-absorbing chamber via a drive structure, and another part of the moisture-absorbing wheel is mounted inside the dehumidification chamber of the dehumidification shell. The dehumidification chamber is used to remove moisture from the moisture-absorbing wheel.

[0015] Furthermore, the driving structure includes: A drive motor is fixedly mounted on the dehumidification housing; A drive gear, which is fixedly mounted on the output shaft of the drive motor; The driven gear ring is sleeved on the outer circumference of the moisture-absorbing wheel and fixedly connected to the moisture-absorbing wheel. The driven gear ring meshes with the driving gear.

[0016] Furthermore, the dehumidification shell is equipped with a hot air duct to remove moisture from the desiccant wheel.

[0017] In this technical solution, the gas in the dehumidification pipe passes through the moisture-absorbing wheel, which absorbs the water vapor in the gas. After a preset time, the drive motor starts, causing the drive gear to rotate the gear ring, which in turn rotates the moisture-absorbing wheel. A portion of the moisture-containing part of the moisture-absorbing wheel rotates into the dehumidification chamber, where the moisture on the moisture-absorbing wheel is removed. Meanwhile, the portion of the moisture-absorbing wheel that was originally in the dehumidification chamber rotates into the dehumidification chamber to continue absorbing water vapor from the gas in the dehumidification pipe, thus improving dehumidification efficiency.

[0018] Furthermore, the ash removal structure includes an ash removal shell, which includes a first section and a second section. Both the first section and the second section extend along the axial direction of the ash removal shell. The end of the first section away from the second section is a first opening, which is connected to one side of the blower. The end of the second section away from the first section is a second opening, which is used to discharge the separated powder. A third opening is provided on the first section perpendicular to the first opening, which is connected to the side of the drying kettle. The diameter of the second section gradually decreases towards the second opening.

[0019] In this technical solution, the gas enters the first stage from the third port. Under the action of the fan, the gas moves upward, while the powder moves downward under the action of gravity and is discharged from the second port, thus achieving separation.

[0020] Furthermore, the heating assembly includes a heating tube, and the inner wall of the drying vessel is provided with a jacket, with the heating tube disposed within the jacket.

[0021] Furthermore, the stirring assembly includes: A stirring motor is fixedly mounted on the top of the drying kettle, and the output shaft of the stirring motor extends into the drying kettle. A stirring rod is fixedly connected to the output shaft of a stirring motor, and a stirring shaft is provided on the outside of the stirring rod.

[0022] Furthermore, a secondary screen is provided inside the drying kettle.

[0023] The beneficial effects of this invention are: 1. The product has good flowability and hydrophobicity, strong anti-caking properties, strong fire extinguishing performance, and shortens the fire extinguishing time.

[0024] 2. The dust removal structure can separate the powder carried in the gas entering the dehumidification component, which can prevent the powder from depositing in the dehumidification component and ensure the drying efficiency and service life of the dryer.

[0025] 3. The gas in the dehumidification duct passes through the moisture-absorbing wheel, which absorbs the water vapor in the gas. After a preset time, the drive motor starts, causing the drive gear to rotate the gear ring, which in turn rotates the moisture-absorbing wheel. A portion of the moisture-containing part of the moisture-absorbing wheel rotates into the dehumidification chamber, where the moisture on the moisture-absorbing wheel is removed. Meanwhile, the portion of the moisture-absorbing wheel that was originally in the dehumidification chamber rotates into the dehumidification chamber to continue absorbing water vapor from the gas in the dehumidification duct, thus improving dehumidification efficiency. Attached Figure Description

[0026] Figure 1 It is a 3D diagram of the dryer; Figure 2 This is a cross-sectional view of the dryer; Figure 3 This is an exploded view of the dryer; Figure 4 This is a schematic diagram of the moisture-absorbing component; Figure 5 This is a schematic diagram of a moisture-absorbing wheel.

[0027] The markings in the diagram are as follows: 1. Drying kettle; 2. Feed inlet; 3. Discharge outlet; 4. Stirring motor; 5. Stirring rod; 6. Stirring shaft; 7. Screen; 8. Heating tube; 9. Jacket; 10. Dehumidification assembly; 11. Dehumidification pipe; 12. Fan; 13. Condenser; 14. Moisture absorption assembly; 15. Moisture absorption chamber; 16. Moisture absorption wheel; 17. Dehumidification shell; 18. Dehumidification chamber; 19. Drive motor; 20. Drive gear; 21. Drive gear ring; 22. Hot air pipe; 23. First section; 24. Second section; 25. Ash removal structure; 26. Ash removal shell; 27. First outlet; 28. Second outlet; 29. ​​Third outlet. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0029] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0030] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0032] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0033] Example 1 An ultrafine dry powder fire extinguishing agent comprises the following raw materials in parts by weight: 7-10 parts alkali slag, 30-40 parts sodium bicarbonate, 0.5-1 parts talc, 5-8 parts marl, 1-3 parts calcium silicate, 30-45 parts ammonium sulfate, 3-7 parts ammonium polyphosphate, 10-20 parts gypsum, 1-4 parts tin oxide, 2-5 parts silicon nitride, 1-2 parts silicone oil, and 0.4-0.6 parts polybutene.

[0034] The products produced have good flowability and hydrophobicity, strong anti-caking properties, strong fire extinguishing performance, and shorten fire extinguishing time.

[0035] The silicone oil is a mixture of dimethyl hydroxy silicone oil and hydrogen-containing silicone oil, with a volume ratio of 1:3-5.

[0036] Example 2 The preparation method of ultrafine dry powder fire extinguishing agent includes the following steps: S1: After crushing the alkali residue, marl, hard silicate and gypsum through a 100-200 mesh sieve, put them into a grinder and grind for 80-160 minutes before discharging; S2: Take 40% sodium bicarbonate and 50% ammonium sulfate by weight and place them in a mixer. Add talc, ammonium polyphosphate, tin oxide, silicon nitride and the final product prepared in step (1). Stir for 35-45 minutes. Then add the remaining 60% sodium bicarbonate and 50% ammonium sulfate by weight and continue stirring for 25-35 minutes. While stirring, heat to 55-65℃ and keep the temperature constant to obtain a mixture. S3: Stir the silicone oil, polybutene and water evenly. The volume ratio of silicone oil to water is 1:1-1.5. After atomization, spray it into the mixture prepared in step (2), stir for 80 minutes and then discharge it into the dryer to dry for 2 hours at a drying temperature of 110-120℃. Cool it down. S4: Crush and sieve the final product prepared in step (3) until the particle size is less than 10μm to obtain the fire extinguishing agent.

[0037] Example 3 like Figure 1-5 As shown, the dryer includes: Drying kettle 1, which is used to contain powder, is provided with a feed inlet 2 and a discharge outlet 3; A stirring assembly is installed inside the drying kettle 1 and is used to stir the powder in the drying kettle 1. The stirring assembly includes a stirring motor 4, a stirring rod 5, and a stirring shaft 6. The stirring motor 4 is fixedly installed at the top of the drying kettle 1, and the output shaft of the stirring motor 4 extends into the drying kettle 1. The stirring rod 5 is fixedly connected to the output shaft of the stirring motor 4, and the stirring shaft 6 is installed outside the stirring rod 5. A secondary screen 7 is installed inside the drying kettle 1.

[0038] A heating component is used to increase the temperature inside the drying kettle 1 to dry the powder. The heating component includes a heating tube 8, and the inner wall of the drying kettle 1 is provided with a jacket 9, in which the heating tube 8 is disposed.

[0039] The dehumidification component 10 is used to remove moisture from the high-temperature and high-humidity gas in the drying kettle 1. The dehumidification component 10 is provided with a dust removal structure 25, which is used to separate the powder carried in the gas entering the dehumidification component 10.

[0040] The powder to be dried is fed into the drying vessel 1 through the feed inlet 2. The stirring component stirs the powder in the drying vessel 1, and the heating component raises the temperature inside the drying vessel 1 to dry the powder. The dehumidification component 10 removes moisture from the high-temperature and high-humidity gas inside the drying vessel 1, thereby achieving the drying of the powder. The ash removal structure 25 can separate the powder carried in the gas entering the dehumidification component 10, which can prevent the powder from depositing inside the dehumidification component 10 and ensure the drying efficiency and service life of the dryer.

[0041] The dehumidification component 10 includes: Dehumidification pipe 11, the inlet end of which is connected to the side of the drying kettle 1, the outlet end of which is connected to the top of the drying kettle 1, and the dehumidification pipe 11 is connected to the inner cavity of the drying kettle 1; Fan 12, which is installed in dehumidification duct 11, is used to draw other air from the inlet end to the outlet end in dehumidification duct 11. Condenser 13, the condenser 13 is used to condense water vapor in the gas entering the dehumidification assembly 10; Moisture-absorbing component 14, which is used to absorb water vapor from the gas entering the dehumidification component 10.

[0042] The condensation by condenser 13 and the moisture absorption by moisture absorption component 14 can basically remove water vapor from the gas, thus achieving the purpose of drying.

[0043] The moisture-absorbing component 14 includes: Moisture absorption chamber 15 is disposed inside dehumidification pipe 11; The moisture-absorbing wheel 16 is rotatably disposed in the moisture-absorbing chamber 15 via a drive structure. Another part of the moisture-absorbing wheel 16 is disposed in the dehumidification chamber 18 of the dehumidification shell 17. The dehumidification chamber 18 is used to remove moisture from the moisture-absorbing wheel 16.

[0044] The driving structure includes: Drive motor 19, which is fixedly mounted on dehumidification shell 17; The drive gear 20 is fixedly mounted on the output shaft of the drive motor 19; The driven gear ring 21 is sleeved on the outer periphery of the moisture-absorbing wheel 16 and fixedly connected to the moisture-absorbing wheel 16. The driven gear ring 21 meshes with the drive gear 20.

[0045] The dehumidification shell 17 is provided with a hot air duct 22 for removing moisture from the moisture-absorbing wheel 16.

[0046] The gas in the dehumidification pipe 11 passes through the moisture-absorbing wheel 16, which absorbs water vapor from the gas. After a preset time, the drive motor 19 starts, causing the drive gear 20 to rotate the gear ring 21, which in turn rotates the moisture-absorbing wheel 16. A portion of the moisture-containing part of the moisture-absorbing wheel 16 rotates into the dehumidification chamber 18, thereby removing moisture from the moisture-absorbing wheel 16 within the dehumidification chamber 18. The portion of the moisture-absorbing wheel 16 that was originally in the dehumidification chamber 18 then rotates into the dehumidification chamber 15 to continue absorbing water vapor from the gas in the dehumidification pipe 11, thus improving dehumidification efficiency.

[0047] The ash removal structure 25 includes an ash removal shell 26, which includes a first section 23 and a second section 24. Both the first section 23 and the second section 24 extend along the axial direction of the ash removal shell 26. The end of the first section 23 away from the second section 24 is a first opening 27, which is connected to one side of the blower 12. The end of the second section 24 away from the first section 23 is a second opening 28, which is used to discharge the separated powder. A third opening 29 is provided on the first section 23 perpendicular to the first opening 27, which is connected to the side of the drying kettle 1. The diameter of the second section 24 gradually decreases towards the second opening 28.

[0048] The gas enters the first section 23 from the third port 29. Under the action of the fan 12, the gas moves upward, but the powder moves downward under the action of gravity and is discharged from the second port 28, thus achieving separation.

[0049] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An ultrafine dry powder fire extinguishing agent, characterized in that... The raw materials, in parts by weight, include: 7-10 parts alkali residue, 30-40 parts sodium bicarbonate, 0.5-1 parts talc, 5-8 parts marl, 1-3 parts calcium silicate, 30-45 parts ammonium sulfate, 3-7 parts ammonium polyphosphate, 10-20 parts gypsum, 1-4 parts tin oxide, 2-5 parts silicon nitride, 1-2 parts silicone oil, and 0.4-0.6 parts polybutene.

2. The ultrafine dry powder fire extinguishing agent according to claim 1, characterized in that, The silicone oil is a mixture of dimethyl hydroxy silicone oil and hydrogen-containing silicone oil, with a volume ratio of 1:3-5.

3. A method for preparing the ultrafine dry powder fire extinguishing agent according to claim 1, characterized in that, Includes the following steps: S1: After crushing the alkali residue, marl, hard silicate and gypsum through a 100-200 mesh sieve, put them into a grinder and grind for 80-160 minutes before discharging; S2: Take 40% sodium bicarbonate and 50% ammonium sulfate by weight and place them in a mixer. Add talc, ammonium polyphosphate, tin oxide, silicon nitride and the final product prepared in step S1. Stir for 35-45 minutes. Then add the remaining 60% sodium bicarbonate and 50% ammonium sulfate by weight and continue stirring for 25-35 minutes. While stirring, heat to 55-65℃ and keep the temperature constant to obtain a mixture. S3: Mix silicone oil, polybutene and water evenly. The volume ratio of silicone oil to water is 1:1-1.

5. After atomization, spray into the mixture prepared by S2, stir for 80 minutes and then discharge. Enter the dryer and dry for 2 hours at a drying temperature of 110-120℃, then cool. S4: Crush and sieve the final product prepared in step S3 until the particle size is less than 10μm to obtain the fire extinguishing agent.

4. The preparation method of an ultrafine dry powder fire extinguishing agent according to claim 3, characterized in that, The dryer includes: Drying kettle (1), the drying kettle (1) is used to contain powder, and the drying kettle (1) is provided with a feed inlet (2) and a discharge outlet (3); A stirring assembly is provided inside the drying kettle (1) and is used to stir the powder in the drying kettle (1). A heating assembly is used to increase the temperature inside the drying kettle (1) to dry the powder. Dehumidification component (10) is used to remove moisture from the high temperature and high humidity gas in the drying kettle (1). Dehumidification component (10) is provided with ash removal structure (25) for separating the powder carried in the gas entering the dehumidification component (10).

5. The method for preparing an ultrafine dry powder fire extinguishing agent according to claim 4, characterized in that, The dehumidification component (10) includes: Dehumidification pipe (11), the inlet end of the dehumidification pipe (11) is connected to the side of the drying kettle (1), the outlet end is connected to the top of the drying kettle (1), and the dehumidification pipe (11) is connected to the inner cavity of the drying kettle (1); Fan (12), the fan (12) is installed in the dehumidification pipe (11), the fan (12) is used to draw other things in the dehumidification pipe (11) from the inlet end to the outlet end; A condenser (13) is used to condense water vapor in the gas entering the dehumidification assembly (10); Moisture-absorbing component (14), which is used to absorb water vapor from the gas entering the dehumidification component (10).

6. The method for preparing an ultrafine dry powder fire extinguishing agent according to claim 5, characterized in that, The moisture-absorbing component (14) includes: A moisture absorption chamber (15) is provided inside a dehumidification pipe (11); The moisture-absorbing wheel (16) is rotatably disposed in the moisture-absorbing chamber (15) by a drive structure. Another part of the moisture-absorbing wheel (16) is disposed in the dehumidification chamber (18) of the dehumidification shell (17). The dehumidification chamber (18) is used to remove moisture from the moisture-absorbing wheel (16).

7. The method for preparing an ultrafine dry powder fire extinguishing agent according to claim 6, characterized in that, The driving structure includes: A drive motor (19) is fixedly mounted on the dehumidification shell (17); The drive gear (20) is fixedly mounted on the output shaft of the drive motor (19); The gear ring (21) is fitted around the outer periphery of the moisture-absorbing wheel (16) and is fixedly connected to the moisture-absorbing wheel (16). The gear ring (21) meshes with the drive gear (20).

8. The method for preparing an ultrafine dry powder fire extinguishing agent according to claim 7, characterized in that, The dehumidification shell (17) is provided with a hot air duct (22) to remove moisture from the moisture-absorbing wheel (16).

9. The method for preparing an ultrafine dry powder fire extinguishing agent according to claim 5, characterized in that, The ash removal structure (25) includes an ash removal shell (26), which includes a first section (23) and a second section (24). The first section (23) and the second section (24) are both arranged to extend along the axial direction of the ash removal shell (26). The end of the first section (23) away from the second section (24) is a first opening (27), which is connected to one side of the blower (12). The end of the second section (24) away from the first section (23) is a second opening (28), which is used to discharge the separated powder. A third opening (29) is arranged on the first section (23) perpendicular to the first opening (27), which is connected to the side of the drying kettle (1). The diameter of the second section (24) gradually decreases towards the second opening (28).

10. The method for preparing an ultrafine dry powder fire extinguishing agent according to claim 4, characterized in that, The heating assembly includes a heating tube (8), and the inner wall of the drying kettle (1) is provided with a jacket (9), with the heating tube (8) disposed inside the jacket (9).

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