Double fluid atomizing spray gun for desulfurization wastewater drying system

Abstract

The utility model relates to industrial atomization and waste gas and wastewater treatment technical field, concretely relates to a double fluid atomization spray gun for desulfurization wastewater drying system, including spray gun main part and the spray head connected in spray gun main part, this double fluid atomization spray gun still includes the cooling jacket sleeve of setting in spray gun main part, the inner wall diameter of this cooling jacket sleeve is greater than the outside diameter of spray gun main part, to make the annular gap for accommodating refrigerant between both. The refrigerant flowing in annular gap effectively isolates the direct heat radiation and impact of external high temperature flue gas to spray gun main part through convection heat transfer, reduces the temperature of spray gun main part and spray head, makes spray gun can stably work in desulfurization wastewater drying system and so on high temperature harsh environment long-term, thereby will service life than traditional no cooling measure's spray gun improve several times, reduce equipment replacement frequency and maintenance cost, make double fluid atomization spray gun can long-term be applicable to desulfurization wastewater drying system.

Description

Technical Field

[0001] This utility model relates to the field of industrial atomization and waste gas and wastewater treatment technology, specifically a dual-fluid atomizing spray gun for a desulfurization wastewater drying system. Background Technology

[0002] Two-fluid atomization technology is an advanced atomization method. Its basic principle is to use the kinetic energy of high-speed compressed air (or other gases) to break liquids into tiny droplets, thereby achieving fine atomization. Compared with traditional single-fluid pressure atomization technology, this technology has advantages such as smaller atomized particle size, more uniform particle size distribution, less influence of liquid pressure changes on atomization effect, and a wider applicable pressure range. Therefore, it has been widely used in industrial production such as chemical, metallurgical, and environmental protection industries.

[0003] Currently, most common dual-fluid atomizing spray guns on the market adopt a coaxial pipe structure design. Specifically, this structure typically includes a central liquid flow pipe and an outer annular airflow channel arranged coaxially with it. The liquid is transported through the inner pipe, while compressed air is transported through the annular space formed between the inner and outer pipes; the two converge and mix at the nozzle outlet, achieving liquid atomization through the strong shearing action between the gas and liquid two-phase flows. This coaxial structure design is simple, easy to process and manufacture, and has a relatively low manufacturing cost, and can meet basic atomization requirements under certain operating conditions.

[0004] However, when this traditional dual-fluid atomizing spray gun is applied to high-temperature drying systems such as those used in zero-discharge processes for desulfurization wastewater in power plants, it reveals numerous technical defects in actual operation, severely restricting the stable operation and economic efficiency of the system. These defects are mainly reflected in the following two aspects:

[0005] First, there is the issue of the spray gun's high-temperature resistance and service life. In desulfurization wastewater drying systems, the spray gun needs to be continuously exposed to a high-temperature flue gas environment of 350℃ to 400℃, enduring not only high-temperature heat radiation but also direct impact from high-speed, high-temperature flue gas. Under such harsh conditions, the metal components of existing spray guns, especially the nozzle, are highly susceptible to thermal deformation, thermal fatigue, and even thermal damage due to prolonged high temperatures, leading to a sharp decline in atomization performance or complete failure. Existing spray gun technologies generally lack effective and durable thermal protection measures, resulting in a shortened service life in such high-temperature applications. This necessitates frequent downtime for replacement, increasing spare parts costs and creating a heavy maintenance workload, ultimately affecting the continuous and stable operation of the entire system.

[0006] Secondly, there is the issue of structural stability and atomization reliability of the spray gun during operation. Under the intense scouring of high-speed two-phase flow (compressed air and liquid) and the disturbance of external high-speed flue gas, the spray gun, especially its front end, is prone to vibration, positional shift, and even angular deflection. This instability directly leads to a decrease in the spatial uniformity of the atomized droplet distribution and changes in the coverage area, preventing the droplets from uniformly exchanging heat and mass with the high-temperature flue gas. The consequence is a reduction in the drying efficiency of desulfurization wastewater, and the drying products (salt powder) may adhere to the reactor wall. In severe cases, this can even affect the material balance and normal operation of the entire drying system, making it difficult to meet the stringent requirements of zero-discharge desulfurization wastewater treatment processes for drying efficiency and stability.

[0007] In summary, existing coaxial dual-fluid atomizing spray guns, limited by their structural design, have significant technical shortcomings when dealing with the complex operating conditions of desulfurization wastewater drying systems, such as high temperatures and high-speed scouring. Therefore, there is an urgent need to optimize and improve current atomizing spray guns to give them excellent high-temperature resistance and operational stability, enabling them to be used long-term in desulfurization wastewater drying systems. Utility Model Content

[0008] The purpose of this invention is to provide a dual-fluid atomizing spray gun for a desulfurization wastewater drying system, so that the dual-fluid atomizing spray gun has excellent high-temperature resistance and operational stability, and can be used in the desulfurization wastewater drying system for a long time.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A dual-fluid atomizing spray gun for a desulfurization wastewater drying system includes a spray gun body and a nozzle. The dual-fluid atomizing spray gun also includes a cooling sleeve sleeved on the spray gun body. The inner diameter of the cooling sleeve is larger than the outer diameter of the spray gun body, so that an annular gap for accommodating refrigerant is formed between the two.

[0011] Alternatively, both the spray gun body and the cooling sleeve are formed with an obtuse-angled extension section, and the nozzle is connected to the extension section, wherein the angle between the nozzle and the extension line of the spray gun body is 80°-85°.

[0012] Alternatively, the difference between the inner diameter of the cooling sleeve and the outer diameter of the spray gun body is 2-4 mm.

[0013] Alternatively, the spray gun body includes a liquid pipeline and a gas pipeline, wherein the gas pipeline is coaxially sleeved on the outer periphery of the liquid pipeline, and the coaxiality between the two is less than 0.05 mm.

[0014] Optionally, the inner walls of both the liquid pipeline and the gas pipeline are configured with a surface roughness Ra ≤ 0.8 μm.

[0015] Alternatively, the nozzle may have a premixing chamber, an acceleration channel, and a nozzle orifice that are sequentially connected along the fluid direction. The premixing chamber is used for preliminary mixing of liquid and gas. The acceleration channel is configured to first contract and then expand. The nozzle orifice is smaller than the acceleration channel to promote the flow of the mixed fluid and to promote liquid atomization.

[0016] Optionally, the cooling sleeve is connected to a refrigerant pipe; the spray gun body includes a liquid pipe and a gas pipe, the liquid pipe being connected to a liquid inlet pipe and the gas pipe being connected to an air inlet pipe.

[0017] Alternatively, the air intake pipes are configured as two and arranged symmetrically with respect to the axis of the spray gun body.

[0018] Alternatively, the outer periphery of the cooling sleeve is provided with three positioning plates that are evenly spaced along the circumferential direction.

[0019] Alternatively, the positioning plate may be made of a high-strength, corrosion-resistant metal material.

[0020] Alternatively, the dual-fluid atomizing spray gun may also include a flange detachably disposed on the outer periphery of the cooling sleeve.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] Through the above technical solution, the coolant flowing within the annular gap effectively isolates the spray gun body from direct heat radiation and impact from the high-temperature flue gas, reducing the actual operating temperature of the spray gun body, especially key components (such as the nozzle). This allows the spray gun to operate stably in high-temperature and harsh environments such as desulfurization wastewater drying systems for extended periods, thus extending its service life several times compared to traditional spray guns without cooling measures, reducing equipment replacement frequency and maintenance costs. By controlling the spray gun body temperature within a safe range, deformation or performance degradation of parts caused by high temperatures can be prevented, ensuring that the flow state and mixing process of the atomizing medium (gas and liquid) do not deviate from design parameters due to equipment thermal deformation. This enables the spray gun to continuously produce atomizing cones with uniform particle size and stable atomization angle, guaranteeing the efficiency and effectiveness of desulfurization wastewater atomization drying. The cooling jacket, installed outside the body, provides protection through physical isolation and heat exchange, without intervening in or altering the core atomization flow channel inside the spray gun. It does not interfere with or resist the internal atomizing airflow and liquid flow, solving the technical problems of short lifespan and unstable performance of traditional two-fluid atomizing spray guns in high-temperature applications. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the exemplary embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0024] Figure 1 A three-dimensional structural schematic diagram of a dual-fluid atomizing spray gun for a desulfurization wastewater drying system provided by this utility model in one embodiment;

[0025] Figure 2 A cross-sectional view of a dual-fluid atomizing spray gun for a desulfurization wastewater drying system provided by this utility model in one embodiment.

[0026] Figure 3 This is a schematic diagram of the nozzle in one embodiment of the dual-fluid atomizing spray gun for a desulfurization wastewater drying system provided by this utility model.

[0027] The markings and corresponding component names in the attached diagram are as follows: 11-Liquid pipeline, 12-Liquid inlet pipe, 21-Gas pipeline, 22-Air inlet pipe, 31-Cooling sleeve, 32-Refrigerant pipe, 4-Nozzle, 41-Premixing chamber, 42-Acceleration channel, 43-Nozzle opening, 5-Annular gap, 6-Positioning plate, 7-Flange. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that while the description of these embodiments is intended to aid in understanding the present invention, it does not constitute a limitation thereof. The specific structural and functional details disclosed herein are only for describing exemplary embodiments of the present invention. However, the present invention may be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0029] According to specific embodiments of this disclosure, a dual-fluid atomizing spray gun for a desulfurization wastewater drying system is provided. Wherein, Figures 1 to 3 Specific embodiments thereof are shown.

[0030] See Figures 1 to 3 As shown, the dual-fluid atomizing spray gun for a desulfurization wastewater drying system includes a spray gun body and a nozzle 4 connected to the spray gun body. The dual-fluid atomizing spray gun also includes a cooling sleeve 31 sleeved on the spray gun body. The inner diameter of the cooling sleeve 31 is larger than the outer diameter of the spray gun body, so that an annular gap 5 for accommodating refrigerant is formed between the two.

[0031] The working process of this dual-fluid atomizing spray gun is as follows:

[0032] 1. The liquid to be atomized (such as desulfurization wastewater) and high-speed gas (such as compressed air) are respectively transported to the nozzle 4 through the spray gun body. Inside the nozzle 4, the high-speed gas impacts and shears the liquid, breaking it into fine droplets, which are finally sprayed out from the nozzle to form an atomizing cone.

[0033] 2. During the atomization process described above, a refrigerant (such as compressed air or cooling water) is introduced into the annular gap 5 between the cooling sleeve 31 and the spray gun body. As the refrigerant flows through this annular channel, it continuously and effectively removes the heat transferred from the external high-temperature environment (such as flue gas at 350°C to 400°C) to the spray gun body.

[0034] Through the above technical solution, the coolant flowing within the annular gap 5 effectively isolates the spray gun body from direct heat radiation and impact by the external high-temperature flue gas through convective heat transfer, reducing the temperature of the spray gun body and nozzle 4. This allows the spray gun to operate stably in high-temperature and harsh environments such as desulfurization wastewater drying systems for extended periods, thereby extending its service life several times compared to traditional spray guns without cooling measures, reducing equipment replacement frequency and maintenance costs. By controlling the temperature of the spray gun body within a safe range, it prevents component deformation or performance degradation caused by high temperatures, ensuring that the flow state and mixing process of the atomizing medium (gas and liquid) do not deviate from design parameters due to equipment thermal deformation. This enables the spray gun to continuously produce atomizing cones with uniform particle size and stable atomization angle, guaranteeing the efficiency and effectiveness of desulfurization wastewater atomization drying. The cooling sleeve 31 is fitted outside the body, and its protective function is achieved through physical isolation and heat exchange. It does not intervene in or change the core atomization flow channel inside the spray gun, and will not cause any interference or resistance to the internal atomizing airflow and liquid flow. This solves the technical problems of short service life and unstable performance of traditional dual-fluid atomizing spray guns in high-temperature applications.

[0035] It should be noted that the directional terms used, such as "inner" and "outer," refer to "inner" and "outer" relative to the outline of the component. "Inner" refers to the direction towards the inside of the component, and "outer" refers to the direction away from it. Furthermore, it should be noted that the terms used, such as "first" and "second," are used to distinguish one element from another and do not indicate sequence or importance. Moreover, in the following descriptions with accompanying drawings, the same reference numerals in different drawings represent the same element.

[0036] Optionally, both the spray gun body and the cooling sleeve 31 have obtuse-angled extension sections, with the nozzle 4 connected to these extension sections. The angle between the nozzle 4 and the extension line of the spray gun body is 80°-85°. That is, the spray gun body and the cooling sleeve 31 form an approximately L-shaped structural layout through the obtuse-angled extension sections. The liquid and gas to be atomized are transported axially along the spray gun body, changing their flow direction at the obtuse-angled extension section, and finally ejected through the nozzle 4, which is inclined at an 80°-85° angle. This allows the atomizing cone to mix with the rising hot flue gas with a more optimized trajectory, avoiding direct impact of droplets on the opposite tower wall and promoting sufficient contact between the gas and liquid phases, thereby improving the mass and heat transfer efficiency of the entire drying system. The specific tilt angle design of the nozzle 4 also allows it to better avoid the hottest flue gas core area, reducing the impact of extreme heat radiation on critical atomizing components. Thus, while improving installation adaptability and drying efficiency, it also enhances operational reliability under harsh conditions.

[0037] In this disclosure, the difference between the inner diameter of the cooling sleeve 31 and the outer diameter of the spray gun body is 2-4 mm. The width of this annular gap 5 is sufficient to form an effective heat-insulating air curtain or liquid curtain, physically isolating the external high-temperature flue gas from the spray gun body and stably controlling the operating temperature of key components such as the nozzle below the material safety threshold. Simultaneously, it avoids problems such as increased overall size, weight, and reduced flexibility of the spray gun due to an overly bulky cooling sleeve 31, allowing for convenient installation and maintenance of the spray gun even in limited installation space. This achieves a better balance between cooling efficiency and flow resistance, ensuring sufficient refrigerant flow while maintaining a high flow rate and heat transfer coefficient, thus achieving efficient and uniform cooling of the spray gun body.

[0038] In one embodiment provided in this disclosure, the spray gun body includes a liquid pipeline 11 and a gas pipeline 21. The gas pipeline 21 is coaxially sleeved around the liquid pipeline 11, and the coaxiality between the two is less than 0.05 mm. The liquid is transported through the internal liquid pipeline 11, while the atomizing gas flows within the gas pipeline 21 with a coaxiality of less than 0.05 mm, forming a uniform, stable, and symmetrical annular gas curtain that surrounds the liquid flow at its center. When both reach the premixing chamber 41, the gas applies a shear force uniformly to the liquid column from all sides, allowing the gas kinetic energy to act on the liquid uniformly and efficiently, thereby improving the liquid atomization effect.

[0039] Specifically, the inner walls of both the liquid pipeline 11 and the gas pipeline 21 are configured with a surface roughness Ra ≤ 0.8 μm. For the liquid pipeline 11, the smooth inner wall reduces the frictional resistance of the liquid flow, enabling a higher flow rate at the same pumping pressure, which helps improve atomization efficiency. For the gas pipeline 21, the smooth flow path makes the compressed air flow more stable, reducing eddies and pressure pulsations, which is beneficial for maintaining the stable transfer of gas kinetic energy. Under the combined effect of both, the liquid and gas can be efficiently and stably atomized at a given working pressure, so that the atomized droplets are sprayed out of the nozzle in a fine and uniform state. In addition, controlling the surface roughness to Ra ≤ 0.8 μm can also reduce the adhesion, crystallization, and growth of dissolved solids or fine particles contained in the liquid on the rough pipe wall surface, allowing the fluid to pass smoothly and preventing scaling, thereby improving the anti-clogging ability and long-term operational stability of the spray gun and reducing maintenance frequency.

[0040] In one embodiment provided in this disclosure, the nozzle 4 has a premixing chamber 41, an acceleration channel 42 and a nozzle orifice 43 that are sequentially connected along the fluid direction. The premixing chamber 41 is used to initially mix liquid and gas. The acceleration channel 42 is configured to first contract and then expand. The nozzle orifice 43 is smaller than the acceleration channel 42, thereby promoting the flow of the mixed fluid and promoting the atomization of the liquid.

[0041] First, the liquid and gas undergo initial mixing and exchange within the premixing chamber 41. The gas begins to exert preliminary shearing force on the liquid surface, forming an unstable gas-liquid two-phase flow. Subsequently, the mixed fluid enters the acceleration channel 42. The initial contraction section of this channel reduces the cross-sectional area of ​​the flow path. According to the fluid continuity theorem, the fluid velocity increases and the pressure decreases. This process not only enhances the kinetic energy transfer between the gas and liquid but also intensifies the turbulence effect, further stretching and tearing the liquid clumps. When the fluid enters the expansion section, the pressure recovers somewhat, but the high-velocity difference continues to exert a strong shearing force on the liquid film. Finally, the mixed fluid is ejected through a smaller nozzle 43, where it undergoes a final, dramatic pressure release and velocity shift, thoroughly breaking the liquid into extremely fine and uniformly distributed atomized droplets.

[0042] By sequentially arranging a premixing chamber 41, an acceleration channel 42 with a contraction-expansion structure, and a smaller nozzle orifice 43 within the nozzle 4, a multi-stage progressive atomization system is formed, which can greatly improve atomization quality and efficiency. Specifically, the premixing chamber 41 ensures that the gas and liquid phases can undergo sufficient and smooth initial mixing before high-speed atomization. The acceleration channel 42, with its contraction-expansion structure, can efficiently convert the pressure energy of the fluid into kinetic energy in the contraction stage, achieving a sharp increase in flow velocity and thus generating strong shear force on the liquid. The subsequent expansion stage, by controlling the smooth transition of pressure, avoids premature separation of the fluid, ensuring maximum energy utilization and flow stability. Finally, the liquid is ejected through the smaller nozzle orifice 43, achieving the final and most intense breakup of the liquid, ultimately producing high-quality droplets with an average particle size in the range of 100-110 μm, a concentrated particle size distribution, and a uniform and stable atomized cone shape.

[0043] In this disclosure, the nozzle is connected to the cooling sleeve 31 via a threaded connection, which facilitates disassembly and maintenance. The nozzle 4 is formed with channels corresponding to the liquid line 11 and the gas line 21, thereby allowing the gas and liquid to smoothly enter the premixing chamber 41.

[0044] In one embodiment provided in this disclosure, the cooling sleeve 31 is connected to the refrigerant pipe 32; the spray gun body includes a liquid pipe 11 and a gas pipe 21, the liquid pipe 11 being connected to the liquid inlet pipe 12, and the gas pipe 21 being connected to the air inlet pipe 22. The refrigerant, atomized liquid, and atomized gas are delivered to the spray gun through corresponding pipes, avoiding mutual interference between different circuits. This allows for independent and precise adjustment of the refrigerant flow rate and pressure, the liquid supply rate, and the kinetic energy of the atomized gas according to actual operating conditions, thereby achieving optimal matching between thermal management, flow control, and atomization efficiency of the spray gun.

[0045] During installation, the interfaces of each functional pipeline are clearly defined, facilitating quick and accurate alignment and connection, effectively reducing installation complexity and the risk of errors. When the system requires maintenance or component replacement, the cooling circuit can be shut down and disassembled for repair without purging or interfering with the core atomizing flow path; similarly, maintenance of the atomizing flow path will not affect the integrity of the cooling system. This not only reduces downtime required for equipment maintenance but also lowers the complexity and intensity of maintenance work, thereby effectively improving the overall system availability and operational economy.

[0046] Based on the above piping setup, the working process of this dual-fluid atomizing spray gun is as follows:

[0047] During the liquid supply stage, the liquid to be atomized is delivered to the liquid pipeline 11 through the inlet pipe 12. The liquid operating pressure is controlled within the range of 0.2-0.8 MPa, forming a flow velocity of 2-8 m / s in the pipeline. The Reynolds number Re of the flow state is maintained between 2000-8000, ensuring that the liquid is in a turbulent state, creating favorable conditions for subsequent efficient mixing.

[0048] During the gas supply and system cooling phase, atomized gas (usually compressed air) enters the spray gun through the inlet pipe 22, with its pressure controlled at 0.35-0.6 MPa, allowing the gas to reach a flow velocity of 15-40 m / s within the annular channel. Simultaneously, cooling gas is introduced through the refrigerant pipe 32 into the annular gap 5 between the cooling sleeve 31 and the spray gun body, with its flow rate controlled at 5-15 L / min. This cooling gas continuously flows within the channel, effectively carrying away the heat absorbed by the spray gun body from the high-temperature environment, thereby stabilizing the surface temperature of key components (such as the nozzle) below 200℃, providing a reliable guarantee for the safe and stable operation of the spray gun in high-temperature environments.

[0049] During the premixing stage, the liquid from the liquid line 11 and the high-speed gas from the gas line 21 converge in the premixing chamber 41 within the nozzle 4 for initial mixing. This process lasts for an extremely short time, approximately 0.5-2 milliseconds. During this stage, the high-speed gas exerts a strong shearing force on the liquid surface, causing the liquid to begin to break up and form larger droplets.

[0050] During the acceleration phase, the initially mixed gas-liquid two-phase flow enters the acceleration channel 42. The special contraction-expansion structure of this channel further increases the airflow velocity to 50-80 m / s. The liquid is further refined under the shearing action of the higher kinetic energy airflow.

[0051] In the final atomization stage, the accelerated mixed fluid is ejected from the nozzle. The droplets are thoroughly broken up by the powerful shear force generated by the extremely high velocity difference, ultimately forming fine droplets with a particle size distribution in the range of 100-110 μm. The atomization manifold exhibits a stable cone angle of 60°-70°, and the atomization field is uniformly distributed, achieving a fine and stable atomization effect.

[0052] Furthermore, two air inlet pipes 22 are configured and arranged symmetrically with respect to the axis of the spray gun body. In this way, the two air inlet pipes 22 simultaneously deliver compressed air to the gas pipeline 21 from symmetrical directions, which can effectively eliminate the flow deviation, vortex, or pressure unevenness caused by the asymmetry of the flow field when air is introduced from one side. This balanced supply makes the gas form an axisymmetric flow field with uniform circumferential pressure distribution in the annular channel, which helps to help the gas mix evenly and stably with the liquid at the nozzle outlet.

[0053] It is worth mentioning that an asymmetrical air intake method will cause the gas to generate a lateral impact force on the internal structure of the spray gun, which may cause slight vibration of the spray gun or additional stress on the pipe connection points. In contrast, a symmetrical air intake method makes the forces generated by the airflow on both sides cancel each other out, thereby reducing the vibration of the spray gun during operation and reducing fatigue damage to the positioning structure.

[0054] In one embodiment of this disclosure, the outer periphery of the cooling sleeve 31 is provided with three positioning plates 6 evenly spaced along the circumferential direction. The three evenly distributed positioning plates 6 together constitute a defined and repeatable positioning structure, effectively preventing the spray gun from rotating in the circumferential direction and shifting in the radial direction. This arrangement conforms to the mechanical principle that three points determine a plane, allowing the spray gun to be reliably installed in the drying system at a preset angle and position. The three positioning plates 6 evenly distribute the constraint force in the circumferential direction of the cooling sleeve 31, and can also effectively suppress the vibration of the spray gun, reducing the risk of loosening or damage to connecting parts due to fatigue damage.

[0055] Specifically, the positioning plate 6 is made of high-strength, corrosion-resistant metal material. Made of high-strength, corrosion-resistant metal, the positioning plate 6 effectively resists environmental corrosion and oxidation, preventing positioning failure, structural loosening, or decreased installation accuracy due to material corrosion and strength reduction. This ensures the long-term stability of the spray gun's installation position and angle during operation, thereby guaranteeing continuous, uniform, and reliable atomization.

[0056] In this disclosure, the positioning plate 6 is made of stainless steel. In other embodiments, the positioning plate 6 may also be made of cemented carbide steel.

[0057] In one embodiment, the dual-fluid atomizing spray gun further includes a flange 7, which is detachably disposed on the outer periphery of the cooling sleeve 31. This allows the spray gun to be quickly removed from the mounting base without extensive disassembly of the connected piping structure, making routine inspection, cleaning, and component replacement of the spray gun simpler and more efficient, reducing downtime and labor costs required for maintenance.

[0058] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A dual-fluid atomizing spray gun for a desulfurization wastewater drying system, comprising a spray gun body and a nozzle, characterized in that, The dual-fluid atomizing spray gun also includes a cooling sleeve fitted onto the spray gun body, and the nozzle is connected to the cooling sleeve; the inner diameter of the cooling sleeve is larger than the outer diameter of the spray gun body, so that an annular gap for accommodating refrigerant is formed between the two.

2. The dual-fluid atomizing spray gun for a desulfurization wastewater drying system according to claim 1, characterized in that, Both the spray gun body and the cooling sleeve have obtuse-angled extension sections, and the nozzle is connected to the extension section. The angle between the nozzle and the extension line of the spray gun body is 80°-85°.

3. The dual-fluid atomizing spray gun for a desulfurization wastewater drying system according to claim 1, characterized in that, The difference between the inner diameter of the cooling sleeve and the outer diameter of the spray gun body is 2-4 mm.

4. The dual-fluid atomizing spray gun for a desulfurization wastewater drying system according to claim 1, characterized in that, The spray gun body includes a liquid pipeline and a gas pipeline. The gas pipeline is coaxially sleeved on the outer periphery of the liquid pipeline, and the coaxiality between the two is less than 0.05 mm.

5. The dual-fluid atomizing spray gun for a desulfurization wastewater drying system according to claim 4, characterized in that, The inner walls of both the liquid and gas pipelines are configured with a surface roughness Ra ≤ 0.8 μm.

6. The dual-fluid atomizing spray gun for a desulfurization wastewater drying system according to claim 1, characterized in that, The nozzle has a premixing chamber, an acceleration channel, and a nozzle orifice that are sequentially connected along the fluid direction. The premixing chamber is used to initially mix the liquid and gas. The acceleration channel is configured to first contract and then expand. The nozzle orifice is smaller than the acceleration channel to promote the flow of the mixed fluid and promote the atomization of the liquid.

7. The dual-fluid atomizing spray gun for a desulfurization wastewater drying system according to claim 1, characterized in that, The cooling sleeve is connected to the refrigerant pipe; the spray gun body includes a liquid pipe and a gas pipe, the liquid pipe is connected to the liquid inlet pipe, and the gas pipe is connected to the air inlet pipe.

8. The dual-fluid atomizing spray gun for a desulfurization wastewater drying system according to claim 7, characterized in that, The air intake pipes are configured as two, and are arranged symmetrically with respect to the axis of the spray gun body.

9. The dual-fluid atomizing spray gun for a desulfurization wastewater drying system according to claim 1, characterized in that, The outer circumference of the cooling sleeve is provided with three positioning plates that are evenly spaced along the circumferential direction.

10. The dual-fluid atomizing spray gun for a desulfurization wastewater drying system according to claim 9, characterized in that, The positioning plate is made of high-strength, corrosion-resistant metal material.

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