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CN-117225634-B - Low-temperature plasma atomizing device and method

CN117225634BCN 117225634 BCN117225634 BCN 117225634BCN-117225634-B

Abstract

The invention discloses a low-temperature plasma atomizing device and method, wherein the plasma atomizing device comprises a plasma generating module, a primary atomizing module and a secondary atomizing module, liquid in a waterway is rapidly torn into small liquid drops by high-speed air flow in the primary atomizing module, the liquid drops are driven to form spray, the secondary atomizing module is arranged at the tail end of the primary atomizing module, working gas with corresponding types and flow rates is introduced into the secondary atomizing module through inclined atomizing holes on the side wall of an atomizing pipe, the plasma generating module is arranged in the atomizing pipe, reactive substances with different rates of RNS and ROS are obtained through the activation process of gas-liquid mass transfer, and the second specific atomization of the liquid is realized, wherein direct current voltages with opposite positive and negative directions are applied to a high-voltage electrode of the primary atomizing module and a high-voltage electrode of the plasma generating module. According to the invention, the cooperative control of parameters such as the volume of the plasma activated water mist, the diameter of the liquid drops, the active components and the like is realized through multiple atomization, and the regulation and control requirements of specific application scenes are met.

Inventors

  • XU HAN
  • WEI ZIPENG
  • XIE KAI
  • SHAO MINGXU

Assignees

  • 西安电子科技大学

Dates

Publication Date
20260512
Application Date
20231025

Claims (9)

  1. 1. A low temperature plasma atomizing device comprising a plasma generating module (7), characterized in that it further comprises: The primary atomization module (3), the high-speed air flow in the primary atomization module (3) rapidly tears the liquid in the waterway into small liquid drops and drives the liquid drops to form spray so as to finish primary atomization; The secondary atomization module (5) is arranged at the tail end of the primary atomization module (3), the secondary atomization module (5) is used for introducing working gas with corresponding types and flow rates through inclined atomization holes on the side wall of the atomization tube (23), the plasma generation module (7) is arranged in the atomization tube (23), and reactive substances with different rates of RNS and ROS are obtained through the activation process of gas-liquid mass transfer, so that the second specific atomization of liquid is realized; the high-voltage electrode of the primary atomization module (3) and the high-voltage electrode of the plasma generation module (7) apply direct-current voltages with opposite positive and negative directions; the high-voltage electrode in the primary atomization module (3) applies direct-current negative pressure lower than the gas breakdown voltage, gas discharge plasma is not generated, liquid drops are negatively charged, and primary charging atomization of liquid is realized; The high-voltage electrode of the plasma generation module (7) applies direct-current positive pressure, and reactive substances with different ratios of RNS and ROS are obtained through the activation process of gas-liquid mass transfer, so that the second specific atomization of liquid is realized; Or the high-voltage electrode in the primary atomization module (3) applies direct-current positive pressure, and the high-voltage electrode of the plasma generation module (7) applies direct-current negative pressure.
  2. 2. The low-temperature plasma atomizing device according to claim 1, further comprising an electrostatic atomizing module (2), wherein the electrostatic atomizing module (2) is composed of a high-voltage electrode and a diffusion cylinder (6), the high-voltage electrode can charge the fogdrops which are atomized secondarily in the atomizing tube according to an induction charging principle while generating plasma, the diffusion cylinder (6) is a conical cylinder and is arranged at the tail end of the atomizing tube (23), the diffusion cylinder (6) is connected with a ground electrode (12) of the primary atomizing module (3), and when the fogdrops are blown out of the atomizing tube (23) by gas, the ground diffusion cylinder (6) attracts the fogdrops which are charged completely to finish three atomization due to the fact that the fogdrops have charges, and meanwhile, the fogdrops have the same charges and repel each other, so that the fogdrops can be atomized further.
  3. 3. The low-temperature plasma atomization device according to claim 1, wherein the primary atomization module (3) comprises a three-way pipe (9), a first port of the three-way pipe (9) is connected to the main air pump (4), a second port of the three-way pipe (9) is connected to the peristaltic pump (10) to finely control water flow entering the three-way pipe (9), a third port of the three-way pipe (9) is connected with the outlet (13) through a throat pipe (14) to form a pressure difference at the outlet (13) to assist high-speed air flow for primary atomization, and the main air pump (4) is used for introducing high-speed air flow to quickly tear liquid in a waterway into small liquid drops and drive the liquid drops to form spray to finish primary atomization.
  4. 4. The low-temperature plasma atomization device according to claim 3, wherein the primary atomization module (3) further comprises a negative high-pressure energy charging module (8), the negative high-pressure energy charging module (8) is composed of a negative high-pressure needle (15) and a ground electrode (12), the positive electrode of the high-voltage power supply is grounded, the negative electrode is connected with the negative high-pressure needle (15), the negative high-pressure needle (15) is negative in voltage, the negative high-pressure needle (15) is arranged in the air inlet (11), namely, the first port of the three-way pipe (9), the negative high-pressure needle (15) applies direct-current negative voltage, the direct-current negative voltage is lower than the gas breakdown voltage, gas discharge plasma is not generated, liquid drops carry negative charges, and primary energy charging atomization of liquid is achieved.
  5. 5. The low-temperature plasma atomizing device according to claim 4, wherein the secondary atomizing module (5) comprises an atomizing pipe (23), the atomizing pipe (23) is of a hollow cylindrical structure and is connected with an outlet (13) of a three-way pipe (9), a plurality of atomizing holes with different inclinations are formed in the side wall of the atomizing pipe (23) along the axial direction, the diameter of each atomizing hole is 2-3mm, an annular air chamber is wrapped on the periphery of the atomizing pipe (23), the air chamber is driven by the moving module (1) and can axially move on the outer wall of the atomizing pipe (23), the air chamber is connected with an air branch pump (26), air flow is driven by the air branch pump (26) to enter the air chamber, liquid drops of primary atomizing spray are sheared in the vertical direction, and secondary atomization is completed.
  6. 6. The low-temperature plasma atomizing device according to claim 5, wherein the diameter of the fogdrops after secondary atomization is cooperatively controlled by the primary atomizing module (3) and the secondary atomizing module (5), namely, the gas flow corresponding to different atomizing hole angles and the gas flow of the branch air pump (26) are controlled according to the difference of the gas flow of the main air pump (4) and the flow of the peristaltic pump (10).
  7. 7. A cryogenic plasma atomising device according to claim 5, characterized in that the plasma generating means (7) comprises a high voltage electrode, which is a metal needle electrode, and a metal ground electrode, the sleeve (21) outside the gas chamber acting as a metal ground electrode, the metal needle electrode applying a sufficiently high dc voltage to ionise the gas in the atomising tube (23) to generate the plasma.
  8. 8. The low-temperature plasma atomizing device according to claim 5, wherein the working gas driven by the branch air pump (26) in the secondary atomizing module (5) is one or more of oxygen, nitrogen, carbon dioxide, hydrogen, air, carbon tetrafluoride, sulfur dioxide or ammonia gas, different gas discharge plasmas are generated in the atomizing tube (23), the water mist is rich in specific active components through the activation process of gas-liquid mass transfer, the active components are RNS and ROS, and the ratio of the RNS to the ROS is different due to the different types and flow rates of the working gas; The gas in the primary atomization module (3) is inert gas or the same kind of gas as the working gas in the secondary atomization module (5).
  9. 9. A method of atomizing a low temperature plasma atomizing apparatus according to claim 2, comprising the steps of: s1, selecting the air flow of a main air pump (4) and the water pumping quantity of a peristaltic pump (10) according to the diameter of a required fog drop, connecting an air pump (26) to a corresponding air bottle according to the requirement, starting the main air pump (4), and driving an air chamber to move to an atomization hole with corresponding inclination of the outer wall of an atomization tube (23) through a moving module (1); S2, a plasma power supply supplies power to a high-voltage electrode in the primary atomization module (3) and a high-voltage electrode in the secondary atomization module (5) at the same time, at the moment, a peristaltic pump (10) is started to pump quantitative water in, primary atomization and charging are completed in the primary atomization module (3), and negatively charged spray with larger liquid drops is generated; S3, negatively charged spray enters a secondary atomization module (5), a branch air pump (26) pumps working gas into the secondary atomization module (5), branch air flow enters an atomization tube (23) from an atomization hole through an air chamber, and the large-droplet spray is sheared and secondarily atomized to form finer spray; s4, the plasma spray is positively charged under the action of high-voltage electricity, the charged finer spray is sprayed out under the drive of high-speed airflow, and is further attracted and diffused by the diffusion cylinder (6) through the grounded diffusion cylinder (6), so that the tertiary atomization is completed, and the fine spray is formed.

Description

Low-temperature plasma atomizing device and method Technical Field The invention belongs to the technical field of plasma atomization, and relates to a low-temperature plasma atomization device and method. Background The low-temperature plasma activated water is prepared by exposing water molecules to a plasma field to excite chemical bonds in and around the water molecules, thereby endowing the water molecules with higher activity and chemical reaction capability. The plasma activated water mist is an innovation based on the low-temperature plasma activated water technology, and molecules of the plasma activated water are better contacted with the environment by spraying the plasma activated water in an atomized form, so that the acting surface area of the plasma activated water is effectively improved. Compared with the traditional plasma activated water treatment mode, the application of the water mist form can not only cover the target surface more uniformly, but also quickly transfer the active ingredients to the surface at the moment of attaching the liquid drops, thereby realizing more efficient treatment effect. The novel plasma activated water mist has stronger effects in the fields of cleaning, disinfection, deodorization and the like, and is also more suitable for some special application scenes, such as fine agricultural spraying, air purification and the like. Chinese patent publication No. CN 115413102A discloses a plasma generating device and an electrostatic atomizer for generating plasma activated mist, which mainly aims to charge the mist, so that the mist can adhere to the surface of an object, and it is difficult to meet the regulation and control requirements of specific application scenarios. The existing plasma water spraying device generally adopts a disposable atomization design, so that the cooperative control of the water mist volume, the droplet diameter and the liquid active ingredients (oxygen-containing active particles or nitrogen-containing active particles) is difficult to realize, and the application and popularization of a plasma activated water technology are limited. For example, in the agricultural field, it is necessary to finely adjust the droplet diameter and the active ingredient content of the water mist according to the growth stage and the pest situation of crops to obtain an optimal protection effect. However, single parameter (voltage, airflow, etc.) adjustment is often difficult to meet this requirement. Disclosure of Invention In order to solve the problems, the invention provides the low-temperature plasma atomization device, which realizes cooperative control of parameters such as the volume of plasma activated water mist, the diameter of liquid drops, active components and the like through multiple atomization, meets the regulation and control requirements of specific application scenes, and solves the problems in the prior art. Another object of the present invention is to provide a low temperature plasma atomization method. The invention adopts the technical scheme that the low-temperature plasma atomization device comprises a plasma generation module and further comprises: The high-speed airflow in the primary atomization module rapidly tears liquid in the waterway into small liquid drops and drives the liquid drops to form spray so as to finish primary atomization; The secondary atomization module is arranged at the tail end of the primary atomization module, and working gas with corresponding types and flow rates is introduced into the secondary atomization module through inclined atomization holes on the side wall of the atomization tube; the high-voltage electrode of the primary atomization module and the high-voltage electrode of the plasma generation module apply direct-current voltages with opposite positive and negative directions. Further, the high-voltage electrode in the primary atomization module applies direct-current negative pressure lower than the gas breakdown voltage, gas discharge plasma is not generated, liquid drops are negatively charged, and primary charging atomization of liquid is realized; The high-voltage electrode of the plasma generation module applies direct-current positive pressure, and reactive substances with different ratios of RNS and ROS are obtained through the activation process of gas-liquid mass transfer, so that the second specific atomization of liquid is realized; Or the high-voltage electrode of the primary atomization module applies direct-current positive pressure, and the high-voltage electrode of the plasma generation module applies direct-current negative pressure. The electrostatic atomization device comprises an atomization tube, an electrostatic atomization module, a diffusion tube and a ground electrode, wherein the electrostatic atomization module consists of a high-voltage electrode and the diffusion tube, the high-voltage electrode can charge fog drops which are atomized secondarily in the atomiz