Anti-agglomeration self-drying type pneumatic powder cloud forming device and using method thereof

Abstract

The invention discloses an anti-agglomeration self-drying type pneumatic powder cloud forming device and a using method thereof, the anti-agglomeration self-drying type pneumatic powder cloud forming device comprises a storage bin, a first Venturi tube unit, a second Venturi tube unit, a vortex tube and a linkage valve system, the air inlet end of the vortex tube is connected with a high-pressure drying air source, a hot air outlet of the vortex tube is connected with a second air inlet, and a cold air outlet of the vortex tube is connected with a first air inlet; the linkage valve system comprises a first valve, a second valve and a third valve arranged at the top of the storage bin. The linkage valve system is connected with the PLC and is configured to have a damp-proof storage mode and an emergency spraying mode, and in the damp-proof storage mode, a first valve and a second valve are closed, and a third valve is opened; in the emergency spraying mode, the first valve and the second valve are opened, and the third valve is closed. The device has the functions of long-term moisture-proof storage and emergency online deep drying, the problems of caking and blockage of catalyst powder can be solved, the temperature of sprayed catalyst powder cloud is increased, and catalytic reaction is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of for spraying catalyst powder in limited space to eliminate CO and other toxic gases, specifically, a kind of anti-agglomeration self-drying type pneumatic powder cloud forming device and its use method, belong to toxic gas processing technical field. BACKGROUND

[0002] In limited space, catalyst powder is often used to quickly eliminate leaked CO and other toxic gases. In order to make the catalyst powder uniformly dispersed, the powder is usually sprayed out to form a powder cloud by pneumatic method. However, the catalyst powder is easily damp and damp during long-term storage, resulting in caking in the storage bin. When emergency starts, these caking will block the conveying pipeline or nozzle, resulting in spraying failure, which seriously affects the emergency treatment effect.

[0003] In the prior art, an ultrasonic oscillator is generally used to break the caked catalyst powder in the bin, but this is a "post remediation", and for the powder that is severely damp, the surface of the broken powder still has water, which is easily re-agglomerated due to temperature and pressure changes during transportation, causing blockage; some solutions propose to introduce dry gas into the storage bin for protection, but lack of organic combination with the emergency spraying process, and cannot realize "online deep drying" during use. Therefore, there is an urgent need for an integrated solution that can realize full-process moisture protection, online dehydration and effective anti-agglomeration. SUMMARY

[0004] The purpose of the present application is to provide an anti-agglomeration self-drying type pneumatic powder cloud forming device and its use method, which has simple structure and has long-term moisture-proof storage and emergency online deep drying function, can fundamentally solve the caking and blocking problems of catalyst powder, and can improve the cloud temperature of sprayed catalyst powder, which is beneficial to the catalytic reaction.

[0005] To achieve the above purpose, the present application provides an anti-agglomeration self-drying type pneumatic powder cloud forming device, comprising a storage bin and an ultrasonic oscillator arranged at the bottom of the storage bin; further comprising a first venturi tube unit, a second venturi tube unit, a particle size cutter, a vortex tube and a linkage valve system, The first venturi tube unit comprises a first gas inlet, a first negative pressure cavity and a first suction pipe, the gas outlet end of the first gas inlet extends into the first negative pressure cavity, the gas inlet end of the first suction pipe communicates with the first negative pressure cavity, and the gas outlet end of the first suction pipe extends into the storage bin and extends to the bottom of the storage bin; The second Venturi tube unit comprises a second air inlet, a second negative pressure cavity and a second injection pipe. The air outlet end of the second air inlet extends into the interior of the second negative pressure cavity. The air inlet end of the second injection pipe is communicated with the second negative pressure cavity. The air outlet end of the second injection pipe is communicated with the first negative pressure cavity. A first valve of the linkage valve system is installed on the pipeline communicated between the second injection pipe and the outlet end of the first negative pressure cavity. The particle size cutter is arranged between the first negative pressure cavity and the second injection pipe, and the tail end of the particle size cutter extends into the interior of the storage bin, so as to separate and recycle the oversized particles into the storage bin. The vortex tube is connected with a high-pressure dry gas source at the air inlet end. The hot gas outlet of the vortex tube is connected with the air inlet end of the second air inlet. The cold gas outlet of the vortex tube is connected with the air inlet end of the first air inlet. The linkage valve system further comprises a second valve arranged at the outlet of the second negative pressure cavity and a third valve arranged at the top of the storage bin. The linkage valve system is connected with a PLC controller and is configured to have a moisture-proof storage mode and an emergency spraying mode. In the moisture-proof storage mode, the first valve and the second valve are closed, and the third valve is opened. In the emergency spraying mode, the first valve and the second valve are opened, and the third valve is closed.

[0006] In the emergency spraying mode of the present application, the cold gas generated by the vortex tube is injected into the first negative pressure cavity through the first air inlet, so as to inject and primarily cool the dry catalyst powder. The hot gas generated by the vortex tube is injected into the second negative pressure cavity through the second air inlet, so as to inject and secondarily heat the catalyst powder to prevent agglomeration.

[0007] The ultrasonic oscillator of the present application is started to work in the emergency spraying mode.

[0008] In the moisture-proof storage mode of the present application, the gas introduced by the vortex tube and the first air inlet and the second air inlet flows through the storage bin and is discharged through the opened third valve, so as to form a micro-positive pressure environment in the storage bin.

[0009] The particle size cutter and the storage bin constitute a powder circulation path. The trapped oversized particles are broken by the ultrasonic oscillator in the circulation and participate in the injection again.

[0010] The ultrasonic oscillator of the present application is arranged obliquely at the bottom of the storage bin, which prevents dust from accumulating at the bottom of the storage bin and helps to guide the powder at the bottom of the storage bin to the inlet of the injection pipe, thereby improving the breaking and powder entrainment efficiency.

[0011] A use method of an anti-agglomeration self-drying type pneumatic powder cloud forming device, comprising a moisture-proof storage mode and an emergency spraying mode: ①The moisture-proof storage mode comprises the following steps: The PLC controller controls to close the first and second valves and open the third valve; The dry clean air provided by the high-pressure gas source enters from the vortex tube air inlet, so that the cold air generated by the vortex tube is discharged to the first air inlet through the vortex tube cold air outlet and then enters the first negative pressure cavity, and the hot air generated by the vortex tube is discharged to the second air inlet through the vortex tube hot air outlet and then enters the second negative pressure cavity, and then flows to the storage bin through the pipeline, and finally is discharged through the opened third valve, so that a micro-positive pressure is formed in the storage bin to prevent moisture from entering; ②The emergency spraying mode comprises the following steps: When it is necessary to spray powder, the PLC controller controls to open the first and second valves and close the third valve; The high-pressure gas is introduced into the vortex tube air inlet, and the PLC controller starts the ultrasonic oscillator; Primary cooling, drying and dehydration section: The low-temperature cold air generated by the vortex tube is sprayed into the first negative pressure cavity from the first air inlet at high speed after flowing through the vortex tube cold air outlet, forming a strong negative pressure, and the catalyst powder at the bottom of the storage bin is sucked out through the first ejector pipe, and the powder and the low-temperature, low-humidity cold air are mixed violently in the first negative pressure cavity, so that the water on the surface of the powder particles obtains a great desorption driving force and rapidly separates from the powder, thereby realizing deep dehydration; Screening and circulating section: the gas-solid mixture after dehydration passes through the particle size cutter upwards, the powder with qualified particle size enters the next stage, and the oversized particles are intercepted and returned to the storage bin, and are broken by the ultrasonic oscillator and participate in the circulation again; Secondary heating and anti-agglomeration section: the high-temperature hot air generated by the vortex tube is sprayed into the second negative pressure cavity from the second air inlet at high speed after flowing through the vortex tube hot air outlet, forming a negative pressure, and the dehydrated powder from the particle size cutter is sucked into the second negative pressure cavity through the second ejector pipe, and the powder and the high-temperature, low-relative-humidity hot air are fully mixed in the second negative pressure cavity; Finally, the fully mixed and dry and dispersed gas-solid mixture is uniformly sprayed out through the spraying outlet, forming a high-efficiency catalyst powder cloud.

[0012] In the primary cooling, drying and dehydration section of the present application, the temperature of the cold air introduced needs to be obviously lower than the storage temperature of the catalyst powder, and the temperature difference is ≥10℃, so that the cold air flow is sufficient to make the water content of the powder obviously decrease within the powder residence time; in the secondary heating and anti-agglomeration section, the temperature of the hot air introduced needs to be obviously higher than the storage and environmental temperature of the catalyst, and the temperature difference is ≥10℃, and the relative humidity of the mixed gas after the hot air is mixed with the gas-solid mixture from the primary cooling, drying and dehydration section is controlled to be below 30%, preferably below 15%.

[0013] In the emergency spraying mode of the present invention, the primary cooling and drying dehydration section and the secondary heating and anti-agglomeration section work together to achieve deep dehydration of the catalyst powder and prevent secondary agglomeration.

[0014] In the emergency spraying mode of the present invention, oversized particles intercepted by the particle size cutter are returned to the storage chamber and broken by the ultrasonic oscillator, and then participate in the ejection step again. During this cycle, the moisture content of the powder continues to decrease.

[0015] Compared with existing technologies, this invention features a dual-mode intelligent switching function: through a linked valve system, it achieves seamless switching between "long-term moisture-proof storage" and "emergency rapid spraying" modes, ensuring both storage safety and emergency effectiveness. This invention also features online powder dehydration, anti-agglomeration, and reaction-promoting properties: the device creatively uses the cold and hot ends of the vortex tube for different stages of the powder processing flow. The cold end is used to cool, dehydrate, and dry the hygroscopic powder, while the hot end is used to heat the dried powder, preventing secondary condensation and adsorption of water vapor and particle agglomeration, thus eliminating blockage at its source. Furthermore, it increases the temperature of the sprayed catalyst powder cloud, which is beneficial for catalytic reaction. Finally, this invention achieves optimal energy utilization: by assigning specific process functions to both the cold and hot outputs of the vortex tube, it achieves highly efficient energy utilization, high system integration, and ingenious design. The present invention has a circulating self-drying mechanism: the excessively large particles that are not sprayed out in the device will repeatedly undergo the above-mentioned dehydration process during the circulation process of returning to the storage bin, so that the powder moisture content in the entire system will continue to decrease during operation, and it has the ability to learn and optimize itself. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the invention.

[0017] In the diagram: 1. First air inlet, 2. First negative pressure cavity, 3. First ejector tube, 4. First valve, 5. Particle size cutter, 6. Second air inlet, 7. Second negative pressure cavity, 8. Second ejector tube, 9. Jet outlet, 10. Storage chamber, 11. Ultrasonic oscillator, 12. Second valve, 13. Third valve, 14. Vortex tube air inlet, 15. Vortex tube hot air outlet, 16. Vortex tube cold air outlet. Detailed Implementation

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] like Figure 1 As shown, an anti-agglomeration self-drying pneumatic powder cloud-forming device includes a storage chamber 10 and an ultrasonic oscillator 11 disposed at the bottom of the storage chamber 10; it also includes a first Venturi tube unit, a second Venturi tube unit, a particle size cutter 5, a vortex tube, and a linkage valve system. The first Venturi tube unit comprises a first air inlet 1, a first negative pressure cavity 2 and a first suction pipe 3. The outlet end of the first air inlet 1 extends into the first negative pressure cavity 2. The inlet end of the first suction pipe 3 is communicated with the first negative pressure cavity 2. The outlet end of the first suction pipe 3 extends into the storage bin 10 and extends to the bottom of the storage bin 10. The second Venturi tube unit comprises a second air inlet 6, a second negative pressure cavity 7 and a second suction pipe 8. The outlet end of the second air inlet 6 extends into the second negative pressure cavity 7. The inlet end of the second suction pipe 8 is communicated with the second negative pressure cavity 7. The outlet end of the second suction pipe 8 is communicated with the first negative pressure cavity 2. The first valve 4 of the linkage valve system is installed on the pipeline communicated between the second suction pipe 8 and the outlet end of the first negative pressure cavity 2. The first valve 4 controls the opening and closing of the outlet of the first negative pressure cavity 2. The particle size cutter 5 is arranged between the first negative pressure cavity 2 and the second suction pipe 8. The tail end of the particle size cutter 5 extends into the inside of the storage bin 10, which is used to separate and recycle the oversized particles into the storage bin 10. The inlet end of the vortex tube is connected with a high-pressure dry gas source. The hot gas outlet 15 of the vortex tube is connected with the inlet end of the second air inlet 6. The cold gas outlet 16 of the vortex tube is connected with the inlet end of the first air inlet 1. The linkage valve system further comprises a second valve 12 arranged at the outlet of the second negative pressure cavity 7 and a third valve 13 arranged at the top of the storage bin 10. The second valve 12 controls the opening and closing of the outlet of the second negative pressure cavity 7. The third valve 13 is usually a micro switch valve with adjustable opening degree.

[0020] The linkage valve system is connected with a PLC controller and is configured to have a moisture-proof storage mode and an emergency spraying mode. In the moisture-proof storage mode, the first valve 4 and the second valve 12 are closed, and the third valve 13 is opened. In the emergency spraying mode, the first valve 4 and the second valve 12 are opened, and the third valve 13 is closed.

[0021] In the emergency spraying mode, the cold gas generated by the vortex tube is injected into the first negative pressure cavity 2 through the first air inlet 1, which is used to inject and primarily cool the dry catalyst powder. The hot gas generated by the vortex tube is injected into the second negative pressure cavity 7 through the second air inlet 6, which is used to inject and secondarily heat the catalyst powder to prevent agglomeration.

[0022] The ultrasonic oscillator 11 is started to work in the emergency spraying mode.

[0023] In the moisture-proof storage mode, the gas flowing through the storage bin 10 through the vortex tube and the first air inlet 1 and the second air inlet 6 is discharged through the opened third valve 13, so as to form a micro-positive pressure environment in the storage bin 10.

[0024] The particle size cutter 5 and the storage bin 10 form a powder circulation path, and the trapped oversized particles are broken by the ultrasonic oscillator 11 in the circulation and participate in the injection again.

[0025] The ultrasonic oscillator 11 is arranged obliquely at the bottom of the storage bin 10, which prevents dust from accumulating at the bottom of the storage bin 10, and helps to guide the powder at the bottom of the storage bin to the inlet of the injection pipe, improving the breaking and powder entrainment efficiency.

[0026] A use method of an anti-agglomeration self-drying type pneumatic powder cloud forming device includes a moisture-proof storage mode and an emergency spraying mode. ①The moisture-proof storage mode includes the following steps: The PLC controller controls the first valve 4 and the second valve 12 to be closed, and the third valve 13 to be opened; The dry and clean air provided by the high-pressure gas source enters the vortex tube inlet 14, and the cold gas generated thereby enters the first negative pressure cavity 2 through the vortex tube cold gas outlet 16 after the first gas inlet 1, and the hot gas generated thereby enters the second negative pressure cavity 7 through the vortex tube hot gas outlet 15 after the second gas inlet 6, and then flows to the storage bin 10 through the pipeline, and finally is discharged through the opened third valve 13, forming a micro-positive pressure in the storage bin 10, which can effectively prevent external moisture from entering, and can slowly remove the moisture on the surface of the powder in the storage bin 10.

[0027] ②The emergency spraying mode includes the following steps: When the powder needs to be sprayed, the PLC controller controls the first valve 4 and the second valve 12 to be opened, and the third valve 13 to be closed; The high-pressure gas is introduced into the vortex tube inlet 14, and the PLC controller starts the ultrasonic oscillator 11; Primary cooling, drying and dehydration section: The low-temperature cold gas generated by the vortex tube is sprayed into the first negative pressure cavity 2 at high speed from the first gas inlet 1, forming a strong negative pressure, and the catalyst powder at the bottom of the storage bin 10 is sucked out through the first injection pipe 3, and the powder and the low-temperature, low-humidity cold gas are mixed violently in the first negative pressure cavity 2, and in this environment, the water on the surface of the powder particles obtains a huge desorption driving force, rapidly separates from the powder, and realizes deep dehydration; Screening and circulation section: The gas-solid mixture after dehydration passes through the particle size cutter 5 upwards, the qualified particle size powder enters the next stage, and the oversized particles are trapped and returned to the storage bin 10, and are broken by the ultrasonic oscillator 11 and participate in the circulation again; Secondary heating anti-agglomeration section: high-temperature hot gas generated by the vortex tube is injected into the second negative pressure cavity 7 at high speed from the second air inlet 6, forming a negative pressure, and the second ejector 8 inhales the dehydrated powder from the particle size cutter 5 of the previous stage, and the powder and the high-temperature, low-relative-humidity hot gas are fully mixed in the second negative pressure cavity 7, which can ensure that even if there is a small amount of water vapor in the mixed gas, it is difficult to condense on the surface of the high-temperature powder again, thereby greatly reducing the probability of re-agglomeration of the powder in the subsequent turbulent transportation.

[0028] Finally, the fully mixed and dry dispersed gas-solid mixture is uniformly sprayed out through the spray outlet 9, forming a high-efficiency catalyst powder cloud.

[0029] In the primary cooling, drying and dehydration section, the temperature of the cold gas needs to be significantly lower than the catalyst powder storage temperature, and the temperature difference is ≥10℃, which ensures that the cold gas flow is sufficient to significantly reduce the water content of the powder within the powder residence time; in the secondary heating anti-agglomeration section, the temperature of the hot gas needs to be significantly higher than the catalyst storage and environmental temperature, and the temperature difference is ≥10℃, and after the hot gas is mixed with the gas-solid mixture from the primary cooling, drying and dehydration section, the relative humidity of the mixed gas is controlled to be below 30%, preferably below 15%.

[0030] In the emergency spraying mode, the primary cooling, drying and dehydration section and the secondary heating anti-agglomeration section work together to achieve deep dehydration of the catalyst powder and prevent secondary agglomeration.

[0031] In the emergency spraying mode, the oversized particles intercepted by the particle size cutter 5 return to the storage bin 10 and are broken by the ultrasonic oscillator 11, and then participate in the injection step again, and the water content of the powder continues to decrease in this circulation process.

[0032] Calculation and analysis of the water content reduction of the catalyst powder in the primary cooling, drying and dehydration section: Catalyst storage and environmental temperature ( ): 25℃, vortex tube cold end outlet gas temperature ( ): -10℃, temperature difference = 35℃; vortex tube hot end outlet gas temperature ( ): 70℃, temperature difference =45℃.

[0033] According to the vapor pressure equation:

[0034] Wherein: the molar vaporization enthalpy of water is 40660 J / mol; Let J be the gas constant, taken as 8.314 J / (mol·K).

[0035] Calculations show that the saturated water vapor pressure at the storage temperature (25℃) is 3.18 kPa, while for the cold airflow (-10℃), the saturated water vapor pressure is 0.29 kPa. The low saturated water vapor pressure of the cold airflow is a strong guarantee for low humidity intake. At this time, a huge water vapor partial pressure difference (≥2.89 kPa) is formed between the cold airflow and the powder surface, which translates to a concentration difference of approximately 22.3 g / m³ according to the ideal gas equation, forming a driving force for the diffusion of moisture from the powder surface into the airflow. In comparison, the saturated air moisture content at 25℃ is only 23.1 g / m³. Therefore, this concentration driving force (22.3 g / m³) is numerically close to the driving force required to completely convert saturated moist air (23.1 g / m³) at 25℃ into dry air, indicating that the dehydration potential provided by the primary cooling drying and dehydration section is extremely large, which is sufficient to theoretically achieve near-complete deep dehydration. In actual operation, the high mass transfer coefficient corresponding to the high turbulence generated at the throat of the Venturi tube, combined with the huge specific surface area of ​​the catalyst powder itself, ensures that the moisture inside and on the surface of the powder can be quickly and efficiently stripped and transferred to the cold airflow during the short residence time of the powder in the primary cooling and drying dehydration section, thereby achieving a significant reduction in water content.

[0036] Analysis of relative humidity control in the secondary heating anti-agglomeration section: Assuming the airflow temperature rises to 5°C after mixing and entrainment at the outlet of the primary cooling, drying, and dehydration section, and the humidity is saturated (in extreme cases), the moisture content at this point is 6.82 g / m³. 3 The partial pressure of water vapor is 0.875 kPa. When it is mixed with 70°C dry air in the secondary heating anti-agglomeration section (accounting for about 70% in the gas supply at the hot end of the vortex tube), the temperature after mixing is about 47.5°C, and the corresponding saturated water vapor pressure is 10.92 kPa. The relative humidity of the mixed gas at the final powder spraying outlet is calculated to be about 8.0%, which meets the requirements for efficient dispersion of catalyst powder.

[0037] An embodiment of the present invention is given. A device is designed for a certain type of CO catalyst powder (particle size 20-40 micrometers), wherein: 1. Air source: A miniature air compressor is used as the high-pressure air source, with a designed outlet pressure of 0.8MPa. After the airflow is dried by removing water, oil, and dust, it is connected to the inlet end 14 of the vortex tube through a pipeline.

[0038] 2. Vortex tube: The vortex tube model WL-08 is selected. Under room temperature and rated working pressure, the temperature of the cold air outlet 16 of the vortex tube can reach about -10~-20°C, and the temperature of the hot air outlet 15 of the vortex tube can reach about 70°C.

[0039] 3. Valves: the first valve 4 and the second valve 12 are normally closed electromagnetic valves, and the third valve 13 is a micro-needle valve with precisely adjustable flow rate. The three valves are controlled by a PLC controller or manually (for occasions without constant power supply).

[0040] 4. Ultrasonic oscillator: the working frequency is 28 kHz, and the power is 50 W.

[0041] 5. Working parameters: ① Humidity storage mode: the PLC controller controls the first valve 4 and the second valve 12 to be closed by power-off, and the third valve 13 to be opened to 10% of the pass diameter, so as to reduce the air compressor supply pressure, and maintain a micro-positive pressure of about 20 Pa in the storage bin 10.

[0042] ② Emergency spraying mode: after receiving the start signal, the PLC controller controls the first valve 4 and the second valve 12 to be opened by power-on, and the third valve 13 to be closed, at the same time, the PLC controller starts the ultrasonic oscillator 11 and the air compressor. The cold air generated by the vortex tube quickly dehydrates the humid powder sucked from the storage bin 10; then, the powder is mixed with hot air, which can ensure the temperature of the surface of the powder particles to rise, effectively preventing water vapor re-adsorption and particle agglomeration. After testing, the device can continuously and stably spray for more than 30 minutes without any blockage phenomenon, and the formed catalyst powder cloud is uniform and has high activity.

[0043] 6. Spraying effect: after the device is running, the catalyst powder cloud fills the limited space within 5 seconds, and the CO concentration decreases by more than 96% within 1 minute.

[0044] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A self-drying pneumatic powder cloud-forming device for preventing agglomeration, comprising a storage chamber (10) and an ultrasonic oscillator (11) disposed at the bottom of the storage chamber (10); characterized in that, It also includes a first Venturi tube unit, a second Venturi tube unit, a particle size cutter (5), a vortex tube, and a linkage valve system. The first Venturi tube unit includes a first air inlet (1), a first negative pressure cavity (2) and a first ejector tube (3). The outlet end of the first air inlet (1) extends into the interior of the first negative pressure cavity (2), the inlet end of the first ejector tube (3) is connected to the first negative pressure cavity (2), and the outlet end of the first ejector tube (3) extends into the storage chamber (10) and extends to the bottom of the storage chamber (10). The second Venturi tube unit includes a second air inlet (6), a second negative pressure cavity (7), and a second ejector tube (8). The outlet end of the second air inlet (6) extends into the interior of the second negative pressure cavity (7). The inlet end of the second ejector tube (8) is connected to the second negative pressure cavity (7). The outlet end of the second ejector tube (8) is connected to the first negative pressure cavity (2). A first valve (4) of the linkage valve system is installed on the pipeline connecting the outlet end of the second ejector tube (8) and the first negative pressure cavity (2). The particle size cutter (5) is located between the first negative pressure cavity (2) and the second ejector tube (8). The tail end of the particle size cutter (5) extends into the interior of the storage chamber (10) to separate and recycle excessively large particles into the storage chamber (10). The vortex tube inlet (14) is connected to a high-pressure drying gas source, the vortex tube hot gas outlet (15) is connected to the inlet end of the second inlet (6), and the vortex tube cold gas outlet (16) is connected to the inlet end of the first inlet (1). The linkage valve system also includes a second valve (12) located at the outlet of the second negative pressure cavity (7) and a third valve (13) located at the top of the storage chamber (10). The linked valve system is connected to a PLC controller and configured to have a moisture-proof reserve mode and an emergency spraying mode. In the moisture-proof storage mode: the first valve (4) and the second valve (12) are closed, and the third valve (13) is open; In emergency spraying mode: the first valve (4) and the second valve (12) are open, and the third valve (13) is closed.

2. The anti-agglomeration self-drying pneumatic powder cloud-forming device according to claim 1, characterized in that, In emergency spraying mode, the cold air generated by the vortex tube is injected into the first negative pressure cavity (2) through the first air inlet (1); the hot air generated by the vortex tube is injected into the second negative pressure cavity (7) through the second air inlet (6).

3. The anti-agglomeration self-drying pneumatic powder cloud-forming device according to claim 2, characterized in that, The ultrasonic oscillator (11) is activated in the emergency spraying mode.

4. The anti-agglomeration self-drying pneumatic powder cloud-forming device according to claim 2, characterized in that, In the moisture-proof storage mode, the gas introduced through the vortex tube and the first air inlet (1) and the second air inlet (6) flows to the storage chamber (10) and is discharged through the opened third valve (13), thereby forming a micro-positive pressure environment in the storage chamber (10).

5. The anti-agglomeration self-drying pneumatic powder cloud-forming device according to claim 2, characterized in that, The particle size cutter (5) and the storage bin (10) form a powder circulation path. The oversized particles that are intercepted are broken up by the ultrasonic oscillator (11) during the circulation and re-participate in the ejection process.

6. The anti-agglomeration self-drying pneumatic powder cloud-forming device according to claim 2, characterized in that, An ultrasonic oscillator (11) is arranged at an angle at the bottom of the storage compartment (10).

7. A method of using an anti-agglomeration self-drying pneumatic powder cloud-forming device, characterized in that, Includes a moisture-proof storage mode and an emergency spraying mode: ① The moisture-proof storage mode includes the following steps: The PLC controller controls the closure of the first valve (4) and the second valve (12), and the opening of the third valve (13). The dry and clean air supplied by the high-pressure air source enters from the air inlet end (14) of the vortex tube, and the cold air generated by it enters the first negative pressure cavity (2) through the cold air outlet (16) of the vortex tube to the first air inlet (1), and the hot air generated by it enters the second negative pressure cavity (7) through the hot air outlet (15) of the vortex tube to the second air inlet (6), and then flows to the storage chamber (10) through the pipeline, and is finally discharged through the opened third valve (13), forming a slight positive pressure in the storage chamber (10) to prevent moisture from entering; ②The emergency spraying mode includes the following steps: When powder needs to be sprayed, the PLC controller controls the opening of the first valve (4) and the second valve (12), and the closing of the third valve (13). High-pressure gas is introduced into the air inlet (14) of the vortex tube, and at the same time the PLC controller starts the ultrasonic oscillator (11). Primary cooling, drying, and dehydration section: The low-temperature cold air generated by the vortex tube is injected at high speed into the first negative pressure cavity (2) through the first air inlet (1) after passing through the cold air outlet (16) of the vortex tube, forming a strong negative pressure. The catalyst powder at the bottom of the storage chamber (10) is sucked out through the first ejector tube (3). The powder is violently mixed with the low-temperature and low-humidity cold air in the first negative pressure cavity (2). Under this environment, the moisture on the surface of the powder particles obtains a huge desorption driving force and quickly detaches from the powder to achieve deep dehydration. Screening and circulation section: The dehydrated gas-solid mixture passes upward through the particle size cutter (5). Powder with qualified particle size enters the next stage, while oversized particles are intercepted and returned to the storage bin (10). During this process, they are broken up by the ultrasonic oscillator (11) and re-enter the circulation. Secondary heating anti-agglomeration section: The high-temperature hot air flow generated by the vortex tube is injected at high speed into the second negative pressure cavity (7) through the second air inlet (6) after passing through the hot air outlet (15) of the vortex tube, forming a negative pressure. The second ejector tube (8) sucks in the dehydrated powder from the previous stage. The powder is fully mixed with the hot air with high temperature and low relative humidity in the second negative pressure cavity (7). Finally, the fully mixed and dried gas-solid mixture is uniformly sprayed out through the injection outlet (9) to form a highly efficient catalyst powder cloud.

8. The method of using the anti-agglomeration self-drying pneumatic powder cloud-forming device according to claim 7, characterized in that, In the primary cooling and drying dehydration stage, the temperature of the cold air introduced is... The temperature difference must be significantly lower than the storage temperature of the catalyst powder. ≥10℃, ensuring the cold airflow is sufficient to significantly reduce the moisture content of the powder within the residence time; in the secondary heating anti-agglomeration section, the temperature of the introduced hot air is... The temperature must be significantly higher than the catalyst storage and ambient temperature, and the temperature difference must be... ≥10℃, and the relative humidity of the mixed gas after the hot gas is mixed with the gas-solid mixture from the primary cooling and drying dehydration section is ≥10℃. It should be controlled below 30%, preferably below 15%.

9. The method of using the anti-agglomeration self-drying pneumatic powder cloud-forming device according to claim 7, characterized in that, In emergency spraying mode, the primary cooling and drying dehydration section and the secondary heating and anti-agglomeration section work together to achieve deep dehydration of the catalyst powder and prevent secondary agglomeration.

10. The method of using the anti-agglomeration self-drying pneumatic powder cloud-forming device according to claim 7, characterized in that, In emergency spraying mode, oversized particles intercepted by particle size cutter (5) are returned to storage chamber (10) and broken by ultrasonic oscillator (11), and then re-participate in the ejection step. During this cycle, the moisture content of the powder continues to decrease.

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