Device and method for producing solid aerosol

Abstract

The invention discloses a device and a method for producing solid aerosol, the device comprises a generating chamber for storing an aerosol solution, an ultrasonic fog making device for producing atomized liquid drops, a dry compressed air source, a jet device and a drying chamber, the ultrasonic fog making device is arranged in the generating chamber and is externally connected with a power supply; the jet device is provided with an air source inlet, an air source outlet and an atomized liquid drop inlet, the air source inlet and the air source outlet are opposite, the atomized liquid drop inlet is arranged between the air source inlet and the air source outlet, the generating chamber is connected with the atomized liquid drop inlet, the drying compressed air source is connected with the air source inlet, and the drying chamber is connected with the air source outlet; and the drying chamber is provided with an aerosol outlet for outputting the dried solid aerosol. According to the invention, an aerosol raw material is dissolved in water to form an aerosol solution, atomized liquid drops with uniform particle sizes are produced by the ultrasonic fog generator, and are dried by the drying compressed air source to form solid aerosol, and the solid aerosol can be directly applied to a purification efficiency test of a high-efficiency filter of a nuclear power plant without secondary separation; and solution waste and pollution are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant air purification testing, and in particular to a device and method for producing solid aerosol. Background Art

[0002] The purification efficiency of the high efficiency filter of the ventilation system of the nuclear power plant is tested and evaluated using sodium fluorescein aerosol as a tracer. Sodium fluorescein aerosol is produced by using compressed air to generate mist through a Creston nozzle. However, the droplets produced by the Creston nozzle are uneven in size, and in order to achieve the particle size range required for the test, the aerosol needs to be separated in the second stage. The second stage separation will produce a large amount of waste solution and the separation branch exhaust needs to be filtered to prevent environmental pollution. These waste liquids and exhaust gases cause waste of chemical materials and are not environmentally friendly. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a device and method for producing solid aerosol.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a device for producing solid aerosol, comprising a generating chamber for storing aerosol solution, an ultrasonic fog maker for producing atomized droplets, a dry compressed air source, an ejector and a drying chamber, wherein the ultrasonic fog maker is arranged inside the generating chamber and is externally connected to a power source;

[0005] The ejector is provided with an air source inlet and an air source outlet relative to each other, and an atomized liquid droplet inlet provided between the air source inlet and the air source outlet, the generating chamber is connected to the atomized liquid droplet inlet, the dry compressed air source is connected to the air source inlet, and the drying chamber is connected to the air source outlet;

[0006] The drying chamber is provided with an aerosol outlet for outputting the dried solid aerosol.

[0007] In some embodiments, the ultrasonic mist generator includes a plurality of ultrasonic oscillators and a plurality of drainage conduits extending into the interior of the aerosol solution, each of the ultrasonic oscillators is connected to a drainage conduit and is installed inside the generating chamber;

[0008] The ultrasonic oscillator is externally connected to a power source.

[0009] In some embodiments, the ultrasonic mist generator further includes a bracket for fixing the ultrasonic oscillator, and the bracket is connected and fixed to the generating chamber.

[0010] In some embodiments, the support is disposed in the middle or upper portion of the generating chamber.

[0011] In some embodiments, there are multiple ultrasonic oscillators, and the multiple ultrasonic oscillators are arranged on the same horizontal line.

[0012] In some embodiments, the generating chamber comprises a container with an opening, a container cover and a connecting pipe, wherein the opening can be opened and closed and sealed by the container cover, the connecting pipe passes through the container cover and communicates with the interior of the container, and the peripheral side of the connecting pipe is sealedly connected to the container cover;

[0013] The container cover is provided with a wiring port electrically connected to the ultrasonic mist maker, and the wiring port is connected to an external power source.

[0014] In some embodiments, the device for producing solid aerosol further comprises a pressure regulating valve, and the pressure regulating valve is respectively connected to the dry compressed gas source and the ejector.

[0015] In some embodiments, the device for producing a solid aerosol further comprises an output conduit connected to the aerosol outlet.

[0016] In some embodiments, the ejector is a venturi ejector.

[0017] The present invention also constructs a method for producing solid aerosols using the device for producing solid aerosols described in any of the above items, comprising preparing an aerosol solution of a target concentration and placing it into a generating chamber, starting an ultrasonic fog maker to atomize to form atomized droplets with uniform particle size and inputting them into an ejector, injecting dry gas through a dry compressed gas source, the dry gas pushing the atomized droplets into the drying chamber and drying the atomized droplets to form a solid aerosol, and the solid aerosol is discharged to the outside through an aerosol outlet.

[0018] By implementing the present invention, the following beneficial effects are achieved:

[0019] The device for producing solid aerosol of the present invention comprises a generating chamber for storing aerosol solution, an ultrasonic fog maker for producing atomized droplets, a dry compressed air source, an ejector and a drying chamber, wherein the ultrasonic fog maker is arranged inside the generating chamber and is externally connected to a power source; the ejector is provided with a relative air source inlet and an air source outlet, and an atomized droplet inlet provided between the air source inlet and the air source outlet, the generating chamber is connected to the atomized droplet inlet, the dry compressed air source is connected to the air source inlet, and the drying chamber is connected to the air source outlet; the drying chamber is provided with an aerosol outlet for outputting the dried solid aerosol. Atomized droplets with uniform particle size can be produced by the ultrasonic fog maker in the generating chamber, and a solid aerosol with uniform particle size can be formed after drying by the dry compressed air source. The solid aerosol can be directly applied to the purification efficiency test of the high-efficiency filter in a nuclear power plant without the need for secondary separation, thereby avoiding waste and pollution of the solution.

[0020] The method of producing solid aerosols using the device for producing solid aerosols described in any of the above items of the present invention comprises preparing an aerosol solution of a target concentration and placing it in a generating chamber, starting an ultrasonic fogger to atomize to form atomized droplets with uniform particle size and inputting them into an ejector, injecting dry gas through a dry compressed gas source, and the dry gas pushes the atomized droplets into the drying chamber and dries the atomized droplets to form a solid aerosol, and the solid aerosol is discharged to the outside through an aerosol outlet. The solid aerosol produced by this method has a uniform particle size and can be directly applied to the purification efficiency test of the high-efficiency filter in a nuclear power plant without the need for secondary separation, thereby avoiding waste and pollution of the solution. Moreover, the particle size of the solid aerosol can be regulated according to the solubility of the aerosol solution, and the aerosol solutions of different target concentrations are proportional to the solid aerosol particle size finally produced, so that the solid aerosol particle size can be adjusted and controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0022] Figure 1 It is a schematic structural diagram of a device for producing solid aerosol according to Embodiment 1 of the present invention. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0024] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a chemical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] Embodiment 1:

[0027] See also Figure 1 One embodiment of the present invention discloses a device for producing solid aerosol, comprising a generating chamber 1 for storing aerosol solution, an ultrasonic mist maker 2 for producing atomized droplets, a dry compressed air source 3, an ejector 4 and a drying chamber 5, wherein the ultrasonic mist maker 2 is arranged inside the generating chamber 1 and is externally connected to a power source. The ejector 4 is provided with an air source inlet 41 and an air source outlet 42 opposite to each other, and an atomized droplet inlet 43 arranged between the air source inlet 41 and the air source outlet 42, the generating chamber 1 is connected to the atomized droplet inlet 43, the dry compressed air source 3 is connected to the air source inlet 41, and the drying chamber 5 is connected to the air source outlet 42. Among them, the ejector 4 is a Venturi ejector 4.

[0028] The drying chamber 5 is provided with an aerosol outlet 51 for outputting the dried solid aerosol. The aerosol outlet 51 is arranged at a position of the drying chamber 5 far away from the dry compressed air source 3 and the generating chamber 1, so that the atomized droplets are fully mixed with the dry compressed air source 3 and then dried and outputted.

[0029] The device for producing solid aerosol can produce atomized droplets with uniform particle size through the ultrasonic fogger 2 in the generating chamber 1, and form a solid aerosol with uniform particle size after drying through the dry compressed air source 3. The dry compressed air source 3 is compressed dry air, and the compressed dry air evaporates the atomized droplets to form a solid aerosol. The solid aerosol can be directly applied to the purification efficiency test of the high-efficiency filter in the nuclear power plant without the need for secondary separation, greatly reducing the generation of waste solution, while avoiding the use of exhaust gas filters and avoiding the pollution of the environment by exhaust gas, which is more conducive to environmental protection and saving of test costs. Among them, the compressed dry air serves as a power source and a drying source, realizing the two functions of extracting and drying the atomized droplets, making the device for producing solid aerosol simple in structure and reducing energy consumption.

[0030] In some embodiments, the ultrasonic mist generator 2 includes a plurality of ultrasonic oscillators 21 and a plurality of drainage conduits 22 extending into the aerosol solution, each ultrasonic oscillator 21 is connected to a drainage conduit 22 and installed inside the generating chamber 1. The ultrasonic oscillator 21 is externally connected to a power source. The ultrasonic oscillator 21 is used to produce atomized droplets of uniform size, and then produce a solid aerosol with uniform particle size, avoiding the disadvantage of uneven droplet production of the original Creston nozzle.

[0031] In some embodiments, the ultrasonic mist generator 2 further comprises a bracket 23 for fixing the ultrasonic oscillator 21, and the bracket 23 is connected and fixed to the generating chamber 1. Preferably, the bracket 23 comprises a fixing member connected to the generating chamber 1 and a platform for fixing the ultrasonic oscillator 21, and the platform has at least one opening for injecting the aerosol solution into the generating chamber 1.

[0032] In some embodiments, the support 23 is disposed in the middle or upper part of the generating chamber 1 to prevent the aerosol solution from soaking the ultrasonic mist generator 2 and affecting its operation. Preferably, the support 23 is disposed in the middle of the generating chamber 1, and a space for storing atomized droplets is reserved in the upper part of the generating chamber 1.

[0033] In some embodiments, there are multiple ultrasonic oscillators 21, and the multiple ultrasonic oscillators 21 are arranged on the same horizontal line. Multiple ultrasonic oscillators are operated in parallel to meet the aerosol requirements of different mass flow rates.

[0034] In some embodiments, the generating chamber 1 includes a container 11 having an opening, a cover of the container 11, and a connecting pipe 13. The opening can be opened and closed and sealed by the cover of the container 11. The connecting pipe 13 passes through the cover of the container 11 and is connected to the inside of the container 11. The circumference of the connecting pipe 13 is sealed and connected to the cover of the container 11. Before the ultrasonic oscillator 21 works, the configured aerosol solution needs to be injected into the container 11 through the opening. The cover of the container 11 covers the opening to achieve sealing, for example, by using a sealing ring. The connecting pipe 13 is used to output the atomized droplets produced by the ultrasonic oscillator 21 to the ejector 4. Preferably, the cross-sections of the container 11, the cover of the container 11, and the connecting pipe 13 are respectively circular to improve the sealing performance.

[0035] The container 11 cover is provided with a connection port electrically connected to the ultrasonic mist maker 2, and the connection port is connected to an external power source. Preferably, the connection port is installed on the container 11 cover through a sealing gasket to achieve sealing, the ultrasonic mist maker 2 is electrically connected to the inner side of the connection port through a power line, and the connection port is connected to the external power source on the outer side.

[0036] In some embodiments, the device for producing solid aerosol further comprises a pressure regulating valve 6, which is respectively connected to the dry compressed gas source 3 and the ejector 4. The dry compressed gas source 3 adjusts the pressure and flow through the pressure regulating valve 6 and provides negative pressure power for the ejector 4.

[0037] In some embodiments, the device for producing solid aerosol further includes an output conduit 7 , which is connected to the aerosol outlet 51 to collect the solid aerosol output from the drying chamber 5 .

[0038] Embodiment 2:

[0039] One embodiment of the present invention also constructs a method for producing solid aerosol using a device for producing solid aerosol, the device for producing solid aerosol includes a generating chamber 1 for storing aerosol solution, an ultrasonic mist maker 2 for producing atomized droplets, a dry compressed air source 3, an ejector 4 and a drying chamber 5, wherein the ultrasonic mist maker 2 is arranged inside the generating chamber 1 and is externally connected to a power supply. The ejector 4 is provided with a relative air source inlet 41 and an air source outlet 42, and an atomized droplet inlet 43 arranged between the air source inlet 41 and the air source outlet 42, the generating chamber 1 is connected to the atomized droplet inlet 43, the dry compressed air source 3 is connected to the air source inlet 41, and the drying chamber 5 is connected to the air source outlet 42. The drying chamber 5 is provided with an aerosol outlet 51 for outputting the dried solid aerosol.

[0040] The method for producing solid aerosol includes preparing an aerosol solution of target concentration and placing it in a generating chamber 1, starting an ultrasonic fogger 2 to atomize to form atomized droplets with uniform particle size and inputting them into an ejector 4, injecting dry gas through a dry compressed gas source 3, and the dry gas pushes the atomized droplets into a drying chamber 5 and dries the atomized droplets to form a solid aerosol, and the solid aerosol is discharged to the outside through an aerosol outlet 51. The aerosol solution is an aqueous solution of aerosol substances (such as sodium fluorescein, sodium chloride, etc.) prepared at a certain concentration.

[0041] The solid aerosol produced by the method has uniform particle size and can be directly applied to the purification efficiency test of the high-efficiency filter in nuclear power plants without secondary separation, thus avoiding waste and pollution of the solution. It can be understood that the application of the solid aerosol produced by the present invention to the purification efficiency test of the high-efficiency filter in nuclear power plants is only one use of the present invention, and when necessary, it can also be applied to other fields, which is not limited by the present invention.

[0042] The particle size of the solid aerosol produced by this method can be controlled according to the solubility of the aerosol solution. The aerosol solutions of different target concentrations are proportional to the final solid aerosol particle size, so the solid aerosol particle size can be adjusted and controlled.

[0043] The target solid aerosol particle size adjustment method is as follows:

[0044] Assume: the density of aerosol substance is ρ1; the concentration of aerosol substance in aqueous solution is C, the density of aqueous solution is ρ2; the diameter of atomized droplet is D; the diameter of solid aerosol is d, then the following relationship holds:

[0045]

[0046] When ρ1, ρ2, and D are known, the relationship between d and C can be calculated according to this formula. That is, according to the requirement of the target solid aerosol particle size d, calculate the concentration of the aqueous solution that needs to be prepared. And vice versa.

[0047] It can be understood that other structures of the device for producing solid aerosol are the same as those in the first embodiment, and will not be described in detail in this embodiment.

[0048] By implementing the present invention, the following beneficial effects are achieved:

[0049] The device for producing solid aerosol of the present invention can produce atomized droplets with uniform particle size through the ultrasonic mist maker 2 in the generating chamber 1, and form a solid aerosol with uniform particle size after drying through the dry compressed air source 3. The solid aerosol can be directly applied to the purification efficiency test of the high-efficiency filter of the nuclear power plant without the need for secondary separation, thereby avoiding the waste and pollution of the solution.

[0050] The method for producing solid aerosol using any of the above-mentioned devices for producing solid aerosols of the present invention has a uniform particle size of the produced solid aerosol, which can be directly applied to the purification efficiency test of the high-efficiency filter in a nuclear power plant without the need for secondary separation, thereby avoiding waste and pollution of the solution. Moreover, the particle size of the solid aerosol can be regulated according to the solubility of the aerosol solution, and the aerosol solutions of different target concentrations are proportional to the particle size of the solid aerosol finally produced, so that the particle size of the solid aerosol can be adjusted and controlled.

[0051] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above embodiments or technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A device for producing solid aerosol, characterized in that: The invention comprises a generating chamber (1) for storing an aerosol solution, an ultrasonic mist maker (2) for producing atomized liquid droplets, a dry compressed air source (3), an ejector (4) and a drying chamber (5), wherein the ultrasonic mist maker (2) is arranged inside the generating chamber (1) and is connected to an external power source; The ejector (4) is provided with an air source inlet (41) and an air source outlet (42) opposite to each other, and an atomized liquid droplet inlet (43) provided between the air source inlet (41) and the air source outlet (42); the generating chamber (1) is connected to the atomized liquid droplet inlet (43); the dry compressed air source (3) is connected to the air source inlet (41); and the drying chamber (5) is connected to the air source outlet (42); The drying chamber (5) is provided with an aerosol outlet (51) for outputting the dried solid aerosol.

2. The device for producing solid aerosol according to claim 1, characterized in that: The ultrasonic mist generator (2) comprises a plurality of ultrasonic oscillators (21) and a plurality of drainage conduits (22) extending into the interior of the aerosol solution, each of the ultrasonic oscillators (21) being connected to a drainage conduit (22) and being installed inside the generating chamber (1); The ultrasonic oscillator (21) is externally connected to a power source.

3. The device for producing solid aerosol according to claim 2, characterized in that: The ultrasonic mist generator (2) further comprises a bracket (23) for fixing the ultrasonic oscillator (21), and the bracket (23) is connected and fixed to the generating chamber (1).

4. The device for producing solid aerosol according to claim 3, characterized in that: The support (23) is arranged at the middle or upper part of the generating chamber (1).

5. The device for producing solid aerosol according to claim 2, characterized in that: There are multiple ultrasonic oscillators (21), and the multiple ultrasonic oscillators (21) are arranged on the same horizontal line.

6. The device for producing solid aerosol according to claim 1, characterized in that: The generating chamber (1) comprises a container (11) provided with an opening, a cover of the container (11) and a connecting pipe (13); the opening can be opened and closed and sealed by the cover of the container (11); the connecting pipe (13) penetrates the cover of the container (11) and communicates with the interior of the container (11); and the peripheral side of the connecting pipe (13) is sealedly connected to the cover of the container (11); The container (11) has a cover provided with a connection port electrically connected to the ultrasonic mist maker (2), and the connection port is connected to an external power source.

7. The device for producing solid aerosol according to claim 1, characterized in that: The device for producing solid aerosol further comprises a pressure regulating valve (6), and the pressure regulating valve (6) is respectively connected to the dry compressed air source (3) and the ejector (4).

8. The device for producing solid aerosol according to claim 1, characterized in that: The device for producing solid aerosol further comprises an output conduit (7), wherein the output conduit (7) is connected to the aerosol outlet (51).

9. The device for producing solid aerosol according to claim 1, characterized in that: The ejector (4) is a Venturi ejector (4).

10. A method for producing solid aerosol using the device for producing solid aerosol according to any one of claims 1 to 9, characterized in that: The method comprises preparing an aerosol solution of a target concentration and placing it in a generating chamber (1), starting an ultrasonic fog maker (2) to atomize to form atomized droplets with uniform particle size and inputting the atomized droplets into an ejector (4), injecting dry gas through a dry compressed gas source (3), the dry gas pushing the atomized droplets into a drying chamber (5) and drying the atomized droplets to form a solid aerosol, and the solid aerosol is discharged to the outside through an aerosol outlet (51).

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