Anti-condensation yellow phosphorus spray gun for preparing ultrapure phosphoric acid

Abstract

The application belongs to the field of high-purity phosphoric acid preparation device, in particular to an anti-condensation yellow phosphorus spray gun for super-pure phosphoric acid preparation, which comprises a middle tube, a nozzle is threadedly connected to the end of the middle tube, a constant temperature component is arranged on the outer side of the middle tube, a gas cap coaxial with the middle tube is arranged at the end of the constant temperature component, a gas blowing gap is left between the gas cap and the surfaces of the constant temperature component, the middle tube and the nozzle, the constant temperature component comprises an outer sleeve, the outer sleeve is threadedly connected to the outer side of the end of the middle tube, a plurality of groups of inflow channels and backflow channels in contact with the outer wall of the middle tube are respectively formed in the inner wall of the outer sleeve, and the inflow channels and the backflow channels are used for flowing of high-temperature fluid medium. High-temperature medium fluid can be introduced into the inflow channels to heat the yellow phosphorus in the middle tube, and the yellow phosphorus in the middle tube can be kept in a liquid state during the working process of yellow phosphorus spraying and burning.

Description

Technical Field

[0001] This invention belongs to the field of high-purity phosphoric acid preparation equipment, specifically an anti-condensation yellow phosphorus spray gun for the preparation of ultrapure phosphoric acid. Background Technology

[0002] In the thermal phosphoric acid production process, liquid yellow phosphorus is atomized by a spray gun and sprayed into a combustion tower to react with air to produce phosphorus pentoxide. After hydration and absorption, phosphoric acid is obtained. However, yellow phosphorus has a melting point of about 44°C and is very easy to solidify and block pipelines at room temperature. This makes it difficult for the liquid yellow phosphorus to be fully atomized, resulting in incomplete combustion and the generation of by-products, which affects the purity of the prepared phosphoric acid. Electronic-grade ultrapure phosphoric acid has extremely high requirements for product purity. As the core feeding equipment for the yellow phosphorus combustion reaction, the stability of yellow phosphorus delivery, the sealing performance during shutdown, and the anti-condensation ability of the spray gun directly determine the product purity and production continuity.

[0003] However, if a liquid atomizing spray gun with a common structure is used, it lacks a continuous constant temperature heating structure. The yellow phosphorus delivery channel inside the spray gun is prone to solidification due to temperature drop, and gradually solidifies and precipitates and adheres to the pipe wall, causing the cross-section of the delivery channel to shrink, the yellow phosphorus spray flow to be unstable, and in severe cases, completely blocking the spray hole, leading to the interruption of the combustion reaction. Therefore, there is an urgent need for a yellow phosphorus spray gun that can heat and maintain the temperature of the liquid yellow phosphorus in the spray gun.

[0004] For example, Chinese Patent CN206799171U discloses a yellow phosphorus spray gun for a combustion tower, including an outer sleeve, a connecting flange, a nozzle, a phosphorus delivery pipe, an inner heating pipe, an outer heating pipe, an air inlet pipe, a heating inlet, and a heating outlet. The air supply chamber formed between the outer sleeve and the outer heating pipe is connected to the nozzle. The phosphorus delivery pipe is connected to the nozzle. The cavity formed between the phosphorus delivery pipe and the inner heating pipe is connected to the cavity formed between the inner heating pipe and the outer heating pipe. The nozzle includes a nozzle connected to the front end of the phosphorus delivery pipe and a conical nozzle sleeve covering the nozzle. The conical nozzle sleeve is fixed to the front end of the outer sleeve. The front part of the nozzle is a conical structure, and the rear part is a cylindrical structure. The top of the conical structure is a spray hole. The spray hole and the front end of the conical nozzle sleeve form an annular gap for air spraying. Multiple spiral grooves are provided on the circumference of the cylindrical structure. The annular gap is connected to the air supply chamber through the spiral grooves.

[0005] The existing solution heats the liquid yellow phosphorus in the spray gun by setting up internal and external heating pipes, but it still has the following problems in actual use: 1. The above-mentioned yellow phosphorus spray gun lacks a quick-cut-off isolation structure after shutdown. After the preparation process is completed, the residual yellow phosphorus inside the spray gun is in direct contact with the outside air for a long time. When the machine is stopped, the nozzle is connected to the combustion furnace cavity and the outside air. The residual yellow phosphorus will react incompletely with the air, producing by-products other than phosphorus pentoxide. When production is restarted, the by-products will directly reduce the purity of the ultrapure phosphoric acid product and cannot meet the stringent requirements of electronic grade phosphoric acid.

[0006] 2. The on / off control of the above-mentioned yellow phosphorus spray gun relies on an independent valve drive mechanism, which requires additional electric, pneumatic or hydraulic drive devices. The equipment has a complex structure, a large number of parts, a high failure rate and wastes energy.

[0007] 3. In the above solution, when the high-temperature fluid medium fails to flow, the yellow phosphorus passage cannot be automatically cut off. The yellow phosphorus will remain in the gradually cooling gun body and eventually solidify, causing the entire spray gun to be blocked. After the fault is restored, the gun body needs to be manually disassembled and cleared, which not only interrupts the production process, but also poses safety hazards such as yellow phosphorus leakage and spontaneous combustion. Summary of the Invention

[0008] To overcome the shortcomings of existing technologies, this invention addresses the technical problem by providing an inlet and outlet channel. This allows a high-temperature fluid to be introduced to heat the yellow phosphorus inside the central tube, maintaining a constant temperature throughout the yellow phosphorus spraying and combustion process. This ensures the yellow phosphorus remains liquid, preventing it from solidifying and hindering spraying. Furthermore, by incorporating an axially sliding inner sleeve, the second cone surface detaches from the first cone surface during phosphoric acid preparation. Liquid yellow phosphorus then enters the gap between the first and second cone surfaces through the inner sleeve and flows into the spray nozzle through the connecting hole, forming a phosphorus delivery path for external spraying. Upon completion of preparation, the elasticity of the return spring quickly... Pushing the inner sleeve causes the second conical surface to fit tightly against the first conical surface, blocking the connecting hole and disconnecting the yellow phosphorus delivery path. This quickly isolates the phosphoric acid in the middle tube from the outside air environment of the spray gun, ensuring the purity of the next round of phosphoric acid preparation. By setting a narrow channel and suction hole, the sliding of the inner sleeve is controlled by Bernoulli's principle. No additional drive structure is needed, and there is no additional energy consumption. The opening and closing of the yellow phosphorus delivery path can be controlled by the power of the high-temperature fluid medium. If a malfunction occurs and the high-temperature fluid medium in the inlet and return channels is interrupted, the yellow phosphorus delivery path can also be automatically cut off. This avoids the problem that the yellow phosphorus in the middle tube will gradually cool and solidify after the constant temperature fails, resulting in uneven spraying or even failure to spray.

[0009] To achieve the above objectives, the present invention provides the following technical solution: 1. An anti-condensation yellow phosphoric acid spray gun for the preparation of ultrapure phosphoric acid, characterized in that the gear processing production device comprises: The middle tube has a nozzle internally threaded to its end, a temperature-regulating component is provided on the outside of the middle tube, and an air cap coaxial with the middle tube is provided at the end of the temperature-regulating component. An air blowing gap is left between the air cap and the temperature-regulating component, the middle tube and the nozzle surface. The constant temperature component includes an outer tube, which is threaded to the outer side of the end of the middle tube. Multiple sets of inlet and return channels are respectively opened on the inner wall of the outer tube and are in contact with the outer wall of the middle tube. The inlet and return channels are used to allow the flow of high temperature fluid medium.

[0010] Furthermore, the inlet and return channels of each group are arranged in a spiral shape, and each inlet and return channel is evenly spaced around the outer surface of the central tube, with the ends of the inlet and return channels near the nozzle connected.

[0011] Furthermore, the middle tube is made of a metal material with good thermal conductivity, and the outer tube is made of stainless steel.

[0012] Furthermore, the outer tube is threaded with a liquid distribution ring at the end away from the nozzle. The liquid distribution ring is sleeved on the outside of the middle tube and fits tightly against the outer wall of the liquid distribution ring. The liquid distribution ring has multiple flow holes, and each flow hole is connected to the corresponding inlet channel and return channel.

[0013] Furthermore, the nozzle has a non-through spray hole at its center, a first conical surface at its tail end, and multiple connecting holes connecting the surface of the first conical surface and the spray hole inside the nozzle. An inner sleeve is slidably connected inside the middle tube near the nozzle, the inner sleeve has a through center, and a second conical surface that can fit tightly against the first conical surface is provided on the side of the inner sleeve near the nozzle. The second conical surface can block the opening of the connecting hole.

[0014] Furthermore, the outer wall of the inner sleeve and the inner wall of the middle tube are respectively provided with stepped surfaces, and a telescopic cavity is formed between the stepped surfaces of the middle tube and the inner sleeve. A suction hole communicating with the telescopic cavity is opened on the middle tube. A through ring is provided between the middle tube and the outer sleeve at the position corresponding to the suction hole. A narrow channel communicating with the suction hole is opened on the through ring at each suction hole. The axis of each narrow channel is perpendicular to the axis of the suction hole, and each narrow channel communicates with the corresponding inlet channel.

[0015] Furthermore, the end face of the through ring is provided with multiple locking pins, the middle tube is provided with a locking groove at the corresponding position of each locking pin, the through ring is provided with a wide groove communicating with the return channel at each return channel, the through ring is provided with a guide channel at each locking pin interval position, and each narrow channel is connected to the adjacent wide groove through the guide channel.

[0016] Furthermore, a return spring is provided inside the telescopic cavity, surrounding the outer side of the inner sleeve. The two ends of the return spring abut against the stepped surfaces of the middle tube and the inner sleeve, respectively. Multiple sealing rings are embedded on the outer wall of the inner sleeve, which fit tightly against the inner wall of the middle tube.

[0017] Furthermore, the end of the outer tube is threadedly connected to an air cap seat, the air cap seat has a vent hole communicating with the air blowing gap, the axial position of the air cap seat on the outer tube is adjustable, the air cap seat is fixedly connected to the air cap, and a locking nut for locking the air cap seat is threadedly connected to the outside of the outer tube.

[0018] The outer sleeve is provided with a mounting flange, and the end of the middle tube away from the nozzle is provided with an injection joint that communicates with the inside of the middle tube.

[0019] In summary, compared with the prior art, the beneficial effects of the present invention are as follows: (1) By setting up an inlet channel and a return channel, a high-temperature medium fluid can be introduced to heat the yellow phosphorus inside the middle tube. During the yellow phosphorus spraying and combustion process, the yellow phosphorus inside the middle tube is kept at a constant temperature, thereby ensuring that the yellow phosphorus is always in a liquid state to avoid cooling and solidification, which would prevent the yellow phosphorus from being sprayed out smoothly.

[0020] (2) By setting an axially sliding inner sleeve, the second cone surface is separated from the first cone surface during the phosphoric acid preparation process. Liquid yellow phosphorus enters the gap between the first and second cone surfaces through the inner sleeve and enters the spray hole through the connecting hole to form a yellow phosphorus transport path and spray it outward. When the preparation is finished, the elasticity of the reset spring is used to quickly push the inner sleeve so that the second cone surface and the first cone surface are tightly attached to block the connecting hole and disconnect the yellow phosphorus transport path. This allows the phosphoric acid in the middle tube to be quickly isolated from the outside air environment of the spray gun, ensuring the purity of the next round of phosphoric acid preparation.

[0021] (3) By setting narrow channels and suction holes, the sliding of the inner sleeve is controlled by Bernoulli's principle. No additional drive structure is needed and no additional energy consumption is required. The opening and closing of the yellow phosphorus transport channel can be controlled by the power of the high-temperature fluid medium.

[0022] (4) If a fault occurs and the high-temperature fluid medium in the inlet and outlet channels is interrupted, this solution can automatically cut off the yellow phosphorus delivery path, thus avoiding the problem that the yellow phosphorus in the middle tube will gradually cool and solidify after the constant temperature failure, resulting in uneven spraying or even failure to spray out, which would force the equipment to be shut down for maintenance. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of the present patent.

[0024] Figure 2 This is a front view of the patent.

[0025] Figure 3 for Figure 2 Sectional view at point AA.

[0026] Figure 4 for Figure 3 A magnified view of a section at point C.

[0027] Figure 5 for Figure 3 Sectional view at point BB.

[0028] Figure 6 This is a schematic diagram of the outer tube.

[0029] Figure 7 This is a schematic diagram of the structure of the central tube.

[0030] Explanation of reference numerals in the attached drawings: 10. Middle tube; 11. Nozzle; 12. Spray hole; 13. Air cap; 14. Air blowing gap; 15. Air cap seat; 16. Vent hole; 17. Locking nut; 18. Connecting hole; 19. First conical surface; 20. Inner sleeve; 21. Second conical surface; 22. Sealing ring; 23. Telescopic cavity; 24. Return spring; 25. Suction hole; 26. Passing ring; 27. Narrow channel; 28. Wide groove; 29. ​​Guide channel; 30. Outer sleeve; 31. Inlet channel; 32. Return channel; 33. Mounting flange; 34. Locking pin; 35. Locking groove; 36. Liquid distribution ring; 37. Flow hole; 38. Injection connector. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] like Figure 1-7 As shown, an anti-condensation yellow phosphorus spray gun for the preparation of ultrapure phosphoric acid includes a central tube 10, with a nozzle 11 threadedly connected to the end of the central tube 10. An outer sleeve 30 is fitted on the outer wall of the central tube 10, and the outer sleeve 30 is threadedly connected to the end of the central tube 10. An air cap seat 15 is threadedly connected to the outer side of the outer sleeve 30. The axial position of the air cap seat 15 on the outer sleeve 30 is adjustable. A locking nut 17 for locking the air cap seat 15 is threadedly connected to the outer sleeve 30. An air cap 13 coaxial with the central tube 10 is fixedly connected to the end of the air cap seat 15. An air blowing gap 14 is left between the air cap 13, the outer sleeve 30, the central tube 10, and the nozzle 11. A vent hole 16 communicating with the air blowing gap 14 is opened on the air cap seat 15. A material injection joint 38 communicating with the central tube 10 is provided at the end of the central tube 10 away from the nozzle 11. An installation flange 33 is provided on the outer side of the outer sleeve 30.

[0033] Liquid yellow phosphorus raw material is injected into the central tube 10 through the injection joint 38 connected to the yellow phosphorus supply pipeline, and high-pressure air is introduced through the vent 16, so that the high-pressure air is blown out at high speed from the air blowing gap 14. Then, using Bernoulli's principle, a low pressure is formed at the end of the nozzle 11 to draw out the yellow phosphorus liquid in the central tube 10. The yellow phosphorus liquid is dispersed into fine droplets under the action of high-speed airflow, and sprayed outward under the airflow to form atomized yellow phosphorus. The uniform and fine yellow phosphorus droplets burn after contacting the air to form phosphorus pentoxide, which can be made into phosphoric acid after being hydrated.

[0034] This solution, by setting the position of the air cap seat 15 to be adjustable, can adjust the gap width of the air blowing gap 14, thereby effectively regulating the airflow velocity. This ensures that the airflow can evenly and fully disperse and spray the yellow phosphorus liquid, ensuring a more uniform atomization effect of the atomized yellow phosphorus, thus ensuring complete combustion of yellow phosphorus, reducing the generation of by-products, and improving the purity of the prepared phosphoric acid.

[0035] like Figure 1-7 As shown, multiple sets of inlet channels 31 and return channels 32 that contact the outer wall of the middle tube 10 are respectively opened on the inner wall of the outer tube 30. Each set of inlet channels 31 and return channels 32 is arranged in a spiral shape. Each inlet channel 31 and return channel 32 is evenly spaced around the outer surface of the middle tube 10. The ends of the inlet channels 31 and return channels 32 near the nozzle 11 are connected. A liquid distribution ring 36 is threadedly connected to the end of the outer tube 30 away from the nozzle 11. The liquid distribution ring 36 is sleeved on the outer side of the middle tube 10 and is tightly fitted to the outer wall of the liquid distribution ring 36. Multiple flow holes 37 are opened on the liquid distribution ring 36. Each flow hole 37 is connected to the corresponding inlet channel 31 and return channel 32.

[0036] Since yellow phosphorus is in a waxy solid state at room temperature, it needs to be preheated to a liquid state before being supplied to the device to ensure smooth spraying and atomization. To prevent the yellow phosphorus from solidifying during the spraying process, the liquid yellow phosphorus in the spray gun needs to be kept at a constant temperature. After the current round of phosphoric acid production is completed, some yellow phosphorus will inevitably remain in the spray gun and solidify as it cools down, blocking the yellow phosphorus passage in the central tube 10 and affecting the smooth flow of liquid yellow phosphorus in the next round of phosphoric acid production.

[0037] By setting the inlet channel 31 and the return channel 32, a high-temperature medium fluid can be introduced. In this embodiment, the high-temperature fluid medium is preferably hot water, which heats the yellow phosphorus inside the middle tube 10. During the yellow phosphorus spraying and combustion process, the yellow phosphorus inside the middle tube 10 is kept at a constant temperature, thereby ensuring that the yellow phosphorus is always in a liquid state and avoiding its cooling and solidification, which would prevent the yellow phosphorus from being sprayed out smoothly.

[0038] Furthermore, by setting the inlet channel 31 and return channel 32 in a uniform spiral shape, the hot water can more evenly and fully contact the surface of the middle tube 10, and increase the contact time between the hot water and the middle tube 10. This ensures that the hot water can fully transfer heat to the yellow phosphorus in the middle tube 10 to keep it at a constant temperature. The hot water flows continuously in the inlet channel 31 and return channel 32, constantly introducing constant-temperature hot water, and avoiding the temperature decay of the hot water from affecting the constant temperature effect in the middle tube 10.

[0039] like Figure 1-7 As shown, the middle tube 10 is made of a metal material with good thermal conductivity. In this embodiment, the middle tube 10 is preferably made of pure copper, so that the heat of the hot water can be efficiently transferred to the yellow phosphorus inside the middle tube 10. The outer tube 30 is made of stainless steel. Hot water and high temperature will cause corrosion of the outer tube 30. At the same time, after the hot water heats the middle tube 10, the middle tube 10 will expand slightly due to the heat, thereby filling the gap between the inner wall of the outer tube 30 and the outer wall of the middle tube 10, preventing hot water leakage in the inlet channel 31 and the return channel 32. Furthermore, since the middle tube 10 made of pure copper has low structural strength, the outer tube 30 fitted on the outside of the middle tube 10 can support and protect the middle tube 10 itself, preventing deformation and other problems and improving its service life.

[0040] like Figure 1-7 As shown, the nozzle 11 has a non-through spray hole 12 at its center, and a first conical surface 19 is provided at the tail end of the nozzle 11. Multiple connecting holes 18 are provided inside the nozzle 11, connecting the surface of the first conical surface 19 and the spray hole 12. An inner sleeve 20 is slidably connected inside the middle tube 10 near the nozzle 11. The inner sleeve 20 is through the center, and a second conical surface 21 is provided on the side of the inner sleeve 20 near the nozzle 11, which can fit tightly with the first conical surface 19. The second conical surface 21 can block the opening of the connecting hole 18. Stepped surfaces are provided on the outer wall of the inner sleeve 20 and the inner wall of the middle tube 10, respectively. A telescopic cavity 23 is formed between the stepped surfaces on the middle tube 10 and the inner sleeve 20. A return spring 24 is provided in the telescopic cavity 23, which surrounds the outer side of the inner sleeve 20. The two ends of the return spring 24 abut against the stepped surfaces of the middle tube 10 and the inner sleeve 20, respectively.

[0041] Because yellow phosphorus is chemically reactive, it reacts spontaneously upon contact with air. If the residual yellow phosphorus in the spray gun reacts with air in the sealed central tube 10 after the current round of phosphoric acid production is completed, it is easy for incomplete combustion to occur in the central tube 10, thereby generating by-products that will affect the purity of phosphoric acid in the next round of production. Therefore, it is necessary to quickly disconnect the contact between the inside of the central tube 10 and the outside air environment of the spray gun when stopping the current round of production.

[0042] This application, by setting an axially sliding inner sleeve 20, allows the second cone surface 21 to detach from the first cone surface 19 during the phosphoric acid preparation process. Liquid yellow phosphorus then enters the gap between the first cone surface 19 and the second cone surface 21 through the inner sleeve 20 and enters the spray hole 12 through the connecting hole 18 to form a yellow phosphorus delivery path for spraying outward. When the preparation is completed, the elasticity of the return spring 24 is used to quickly push the inner sleeve 20, causing the second cone surface 21 to fit tightly against the first cone surface 19, blocking the connecting hole 18 and disconnecting the yellow phosphorus delivery path. This allows the phosphoric acid in the middle tube 10 to be quickly isolated from the external air environment of the spray gun, ensuring the purity of the next round of phosphoric acid preparation.

[0043] like Figure 1-7 As shown, two suction holes 25 communicating with the telescopic cavity 23 are symmetrically arranged on the middle tube 10 at the corresponding positions of the telescopic cavity 23. A through ring 26 is provided between the middle tube 10 and the outer tube 30 at the corresponding positions of the suction holes 25. A narrow channel 27 communicating with the suction hole 25 is provided on the through ring 26 at each suction hole 25. The axis of each narrow channel 27 is perpendicular to the axis of the suction hole 25. Each narrow channel 27 communicates with the corresponding inlet channel 31. Two locking pins 34 are symmetrically arranged on the end face of the through ring 26. A slot 35 is provided at the corresponding position of each locking pin 34. A wide groove 28 communicating with the return channel 32 is provided at each return channel 32 on the through ring 26. A guide channel 29 is provided at the interval position of each locking pin 34 on the through ring 26. Each narrow channel 27 is connected to the adjacent wide groove 28 through the guide channel 29. A plurality of sealing rings 22 are embedded on the outer wall of the inner sleeve 20 and are tightly fitted to the inner wall of the middle tube 10. In this embodiment, the sealing rings 22 are preferably made of Teflon material with a low coefficient of friction.

[0044] By setting the narrow channel 27 and the suction hole 25, the hot water in the inlet channel 31 is accelerated when it flows through the narrow channel 27. Then, using Bernoulli's principle, a low pressure is formed in the suction hole 25 and the telescopic cavity 23, which forces the inner sleeve 20 away from the nozzle 11 to open the yellow phosphorus delivery passage. After the hot water enters the guide channel 29, it can directly enter the return channel 32 through the wide groove 28 and flow back. At the same time, the design of the locking pin 34 and the locking groove 35 not only facilitates the return of hot water in the guide channel 29, but also plays a positioning role to ensure that the narrow channel 27 and the suction hole 25 are accurately aligned.

[0045] Furthermore, this method eliminates the need for additional drive structures and consumes no additional energy. The opening and closing of the yellow phosphorus delivery path can be controlled by the power of the high-temperature fluid medium. If a malfunction causes the high-temperature fluid medium in the inlet channel 31 and the return channel 32 to be interrupted, the yellow phosphorus delivery path can be automatically cut off. This avoids the problem that the yellow phosphorus in the middle tube 10 will gradually cool and solidify after the constant temperature fails, resulting in uneven spraying or even failure to spray.

[0046] By setting the sealing ring 22, the gap between the inner sleeve 20 and the middle tube 10 can be slidably sealed, so that the internal chamber of the telescopic cavity 23 is in a relatively sealed state. This allows the Bernoulli effect generated at the narrow channel 27 to more significantly reduce the volume of the telescopic cavity 23, thereby ensuring that the inner sleeve 20 can stably move away from the nozzle 11 to open the yellow phosphorus delivery passage.

[0047] In this embodiment, initially, the operator installs the device in the yellow phosphorus combustion hydration tower through the mounting flange 33, connects the injection joint 38 to the yellow phosphorus supply pipeline, connects the vent hole 16 to the high-pressure air supply pipeline, and then connects the flow hole 37 corresponding to the inlet channel 31 to the hot water pump, and connects the flow hole 37 corresponding to the return channel 32 to the return water tank. When connecting, ensure that the gap between the middle pipe 10 and the outer pipe 30 is completely filled with water. It should also be ensured that the suction hole 25 and the expansion cavity 23 are filled with water to avoid residual gas affecting the heat conduction effect, and to avoid the problem of Bernoulli effect failure when air bubbles flow with the water and pass through the narrow channel 27. At this time, the second cone surface 21 and the first cone surface 19 are in close contact.

[0048] When used for the first time, hot water is pumped to flow spirally through the two inlet channels 31, gradually preheating the surface of the middle tube 10. The hot water continuously pushes out the room temperature water that was originally filling the space between the middle tube 10 and the outer tube 30, until the hot water enters the return channel 32 after passing through the narrow channel 27, the guide channel 29 and the wide groove 28 and is finally discharged, until the temperature inside the middle tube 10 reaches the specified temperature and the position is constant.

[0049] During this process, when the water flows through the narrow channel 27, the flow velocity increases and a Bernoulli effect is generated, resulting in low pressure at the expansion cavity 23. The volume of the expansion cavity 23 contracts, forcing the inner sleeve 20 away from the nozzle 11. A gap is created between the first conical surface 19 and the second conical surface 21, opening the yellow phosphorus delivery passage. At the same time, preheated liquid yellow phosphorus is injected into the middle tube 10 of the injection joint 38. The yellow phosphorus enters the spray hole 12 through the middle tube 10, the inner sleeve 20, and the connecting hole 18. Simultaneously, high-pressure air is blown into the air blowing gap 14 through the vent hole 16. The high-pressure air forms a high-speed airflow at the opening of the air blowing gap 14, which draws the yellow phosphorus out of the spray hole 12 and disperses and atomizes it. It is then sprayed into the yellow phosphorus combustion hydration tower for combustion to prepare high-purity phosphoric acid.

[0050] When the phosphoric acid preparation is completed, the supply of yellow phosphorus and high-pressure air is stopped, and the pumping of hot water is stopped. The low pressure generated by the Bernoulli displacement at the telescopic cavity 23 disappears, and the inner sleeve 20 slides towards the nozzle 11 under the elastic thrust of the return spring 24. The second cone surface 21 and the first cone surface 19 are attached to disconnect the yellow phosphorus delivery path and isolate the outside air, so as to avoid the yellow phosphorus remaining in the middle tube 10 from not fully burning and producing by-products due to contact with the outside air.

[0051] During the next round of phosphoric acid production, the residual yellow phosphorus in the middle tube 10 has cooled and solidified, blocking the passage in the middle tube 10 and making it difficult to directly transport liquid yellow phosphorus. At this time, hot water is injected into the inlet channel 31 in advance to heat and melt the residual solid yellow phosphorus in the middle tube 10. At this time, the flow rate of hot water in the inlet channel 31 is controlled to be lower than the normal operating flow rate to avoid the inner sleeve 20 being opened accidentally. After the solid yellow phosphorus in the middle tube 10 has completely melted, the flow rate of hot water in the inlet channel 31 is increased, and the supply of yellow phosphorus and high-pressure air is turned on to carry out phosphoric acid preparation again.

[0052] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0053] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0054] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A spray gun for preventing the coagulation of yellow phosphoric acid during preparation, characterized in that, The gear processing production apparatus includes: A central tube (10) is provided with a nozzle (11) internally threaded at the end of the central tube (10). A constant temperature component is provided on the outside of the central tube (10). An air cap (13) coaxial with the central tube (10) is provided at the end of the constant temperature component. An air blowing gap (14) is left between the air cap (13) and the surfaces of the constant temperature component, the central tube (10) and the nozzle (11). The constant temperature component includes an outer tube (30), which is threaded to the outer side of the end of the middle tube (10). Multiple sets of inlet channels (31) and return channels (32) that contact the outer wall of the middle tube (10) are respectively opened on the inner wall of the outer tube (30). The inlet channels (31) and return channels (32) are used to supply high temperature fluid medium for flow.

2. The anti-coagulation yellow phosphorus spray gun for the preparation of ultrapure phosphoric acid according to claim 1, characterized in that, The inlet channel (31) and return channel (32) of each group are arranged in a spiral shape. The inlet channel (31) and return channel (32) are evenly spaced around the outer surface of the middle tube (10). The ends of the inlet channel (31) and return channel (32) near the nozzle (11) are connected.

3. The anti-coagulation yellow phosphorus spray gun for the preparation of ultrapure phosphoric acid according to claim 2, characterized in that, The middle tube (10) is made of a metal material with good thermal conductivity, and the outer tube (30) is made of stainless steel.

4. The anti-condensation yellow phosphoric acid spray gun for the preparation of ultrapure phosphoric acid according to claim 2, characterized in that, The outer tube (30) is threaded to a liquid distribution ring (36) at the end away from the nozzle (11). The liquid distribution ring (36) is sleeved on the outside of the middle tube (10) and fits tightly against the outer wall of the liquid distribution ring (36). The liquid distribution ring (36) has multiple flow holes (37), and each flow hole (37) is connected to the corresponding inlet channel (31) and return channel (32).

5. The anti-condensation yellow phosphorus spray gun for the preparation of ultrapure phosphoric acid according to claim 4, characterized in that, The nozzle (11) has a non-through spray hole (12) at its center. The nozzle (11) has a first conical surface (19) at its tail end. The nozzle (11) has multiple connecting holes (18) that connect the surface of the first conical surface (19) and the spray hole (12). The inner sleeve (20) is slidably connected to one end of the middle tube (10) near the nozzle (11). The inner sleeve (20) has a through center. The inner sleeve (20) has a second conical surface (21) that can fit tightly against the first conical surface (19) on the side near the nozzle (11). The second conical surface (21) can block the opening of the connecting hole (18).

6. The anti-condensation yellow phosphorus spray gun for the preparation of ultrapure phosphoric acid according to claim 5, characterized in that, The outer wall of the inner sleeve (20) and the inner wall of the middle tube (10) are respectively provided with stepped surfaces. A telescopic cavity (23) is formed between the stepped surfaces of the middle tube (10) and the inner sleeve (20). A suction hole (25) communicating with the telescopic cavity (23) is opened on the middle tube (10). A through ring (26) is provided between the middle tube (10) and the outer sleeve (30) at the position corresponding to the suction hole (25). A narrow channel (27) communicating with the suction hole (25) is opened on the through ring (26) at each suction hole (25). The axial direction of each narrow channel (27) is perpendicular to the axial direction of the suction hole (25). Each narrow channel (27) is connected to the corresponding inlet channel (31).

7. The anti-condensation yellow phosphorus spray gun for the preparation of ultrapure phosphoric acid according to claim 6, characterized in that, Multiple locking pins (34) are provided on the end face of the over-ring (26). A slot (35) is provided on the middle tube (10) at the corresponding position of each locking pin (34). A wide groove (28) communicating with the return channel (32) is provided on the over-ring (26) at each return channel (32). A guide channel (29) is provided on the over-ring (26) at the interval position of each locking pin (34). Each narrow channel (27) is connected to the adjacent wide groove (28) through the guide channel (29).

8. The anti-coagulation yellow phosphorus spray gun for the preparation of ultrapure phosphoric acid according to claim 7, characterized in that, The telescopic cavity (23) is provided with a return spring (24) surrounding the outer side of the inner sleeve (20). The two ends of the return spring (24) abut against the stepped surfaces of the middle tube (10) and the inner sleeve (20), respectively. Multiple sealing rings (22) are embedded on the outer wall of the inner sleeve (20) and fit tightly against the inner wall of the middle tube (10).

9. The anti-coagulation yellow phosphorus spray gun for the preparation of ultrapure phosphoric acid according to claim 1, characterized in that, The outer tube (30) is threaded to the end of a cap seat (15). The cap seat (15) has a vent hole (16) that communicates with the air gap (14). The axial position of the cap seat (15) on the outer tube (30) is adjustable. The cap seat (15) is fixedly connected to the cap (13). The outer tube (30) is threaded to the outside of a locking nut (17) for locking the cap seat (15).

10. The anti-coagulation yellow phosphorus spray gun for the preparation of ultrapure phosphoric acid according to claim 1, characterized in that, An installation flange (33) is provided on the outside of the outer tube (30), and an injection joint (38) communicating with the inside of the middle tube (10) is provided at the end of the middle tube (10) away from the nozzle (11).

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