A zinc powder condenser and a production equipment thereof

Abstract

The present application relates to the technical field of zinc powder production, and discloses a zinc powder condenser and a zinc powder production equipment, which comprises an outer shell provided with a cooling water inlet, a cooling cavity, a cooling water outlet and an outer feed inlet, wherein the cooling water inlet, the cooling water outlet and the outer feed inlet are communicated with the cooling cavity; an inner shell is arranged in the outer shell, a first medium flow channel is arranged between the inner wall of the cooling cavity and the outer side wall of the inner shell, the inner shell is provided with a condensing cavity and an inner feed inlet, the inner feed inlet is communicated with the condensing cavity, and the inner feed inlet is arranged at the upper portion of the inner shell; a feed pipe is communicated with the condensing cavity through the outer feed inlet and the inner feed inlet in sequence; and a overflow plate is communicated with the overflow cavity through the cooling water inlet, a second medium flow channel is arranged between the outer side of the overflow plate and the inner wall of the cooling cavity, and the second medium flow channel is communicated with the first medium flow channel. The zinc powder condenser and the zinc powder production equipment can improve the uniformity of the temperature field in the condensing cavity, and further improve the granularity uniformity of the zinc powder product.

Description

Technical Field

[0001] This invention relates to the technical field of zinc powder production, and in particular to a zinc powder condenser and its production equipment. Background Technology

[0002] Existing zinc powder condensation devices typically include a housing containing condenser tubes. Cooling water circulates within the condenser tubes, and high-temperature zinc vapor is introduced into the housing. The zinc vapor exchanges heat with the cooling water, causing the zinc vapor to crystallize and produce zinc powder. For example, Chinese patent CN202320598149.9 discloses a high-efficiency zinc powder condensation device that improves the heat exchange efficiency between zinc vapor and cooling water by arranging multiple condenser tubes within the condensation chamber and incorporating spiral channels within these tubes, allowing cooling water to circulate and tumble within the spiral channels. However, in this type of device, the cooling water exchanges heat through internal pipe circulation. The flow distribution of the cooling water within the pipes is significantly affected by the pipe layout, easily leading to localized flow deviations and dead zones. This results in circumferential temperature differences within the condensation chamber, causing uneven temperature field distribution. Consequently, the cooling rate of zinc vapor varies in different areas of the condensation chamber, affecting the nucleation and crystal growth process of zinc droplets. This results in a wider particle size distribution of the precipitated zinc powder and poor product particle size uniformity. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. It provides a zinc powder condenser and its production equipment to improve the uniformity of the temperature field within the condensation chamber, thereby enhancing the particle size uniformity of the zinc powder product.

[0004] To achieve the above objectives, the present invention provides a zinc powder condenser, comprising: The outer casing is provided with a cooling water inlet, a cooling chamber, a cooling water outlet, and an external feed inlet, wherein the cooling water inlet, the cooling water outlet, and the external feed inlet are connected to the cooling chamber; An inner shell is disposed inside the outer shell. A first medium flow channel is provided between the inner wall of the cooling cavity and the outer wall of the inner shell. The inner shell is provided with a condensation cavity and an inner feed port. The inner feed port is connected to the condensation cavity and is located at the upper part of the inner shell. A feed pipe, one end of which is connected to zinc vapor, and the other end of which is connected to the condensation chamber via the outer feed port and the inner feed port in sequence; An overflow plate is disposed inside the outer shell. The overflow plate is connected around the edge of the top of the inner shell to form an overflow cavity. The cooling water inlet is connected to the overflow cavity. A second medium flow channel is provided between the outer side of the overflow plate and the inner wall of the cooling cavity. The second medium flow channel is connected to the first medium flow channel.

[0005] As a preferred embodiment, the upper edge of the overflow plate is provided with an overflow outlet, which is serrated.

[0006] As a preferred embodiment, the inlet water temperature of the cooling water inlet is set between 25℃ and 40℃.

[0007] As a preferred embodiment, the cooling chamber is divided into an inlet section, a middle section, and a rear section along the height direction. The axial temperature gradient of the inlet section is set at 80℃ / m to 120℃ / m, the axial temperature gradient of the middle section is set at 40℃ / m to 70℃ / m, and the axial temperature gradient of the rear section is set at 15℃ / m to 30℃ / m.

[0008] As a preferred embodiment, the condensation chamber has a height dimension of L meters, wherein the dimensions of the inlet section, the middle section, and the rear section are 1 / 3 * L meters, respectively.

[0009] As a preferred embodiment, the inner shell includes a side plate and a top plate, the upper end of the side plate is connected to the top plate, the overflow plate is connected to the top plate, a first medium flow channel is provided between the side plate and the inner wall of the cooling cavity, the side plate forms a first angle with the height direction, and the condensation cavity is arranged with a smaller upper part and a larger lower part.

[0010] As a preferred embodiment, the first included angle is set between 15° and 20°.

[0011] A zinc powder production equipment includes a melting furnace, an evaporation furnace, a screening machine, a packaging machine, and a zinc powder condenser, wherein the melting furnace, the evaporation furnace, the zinc powder condenser, the screening machine, and the packaging machine are connected in sequence.

[0012] As a preferred embodiment, the zinc powder production equipment further includes a first airtight valve, a buffer chamber, and a second airtight valve. The lower end of the zinc powder condenser is connected to the upper end of the buffer chamber through the first airtight valve, and the lower end of the buffer chamber is connected to the screening machine through the second airtight valve.

[0013] As a preferred embodiment, the zinc powder production equipment further includes a connecting pipe and a heating jacket. The heating jacket is fitted onto the outer circumference of the connecting pipe. The melting furnace is connected to the evaporation furnace through the connecting pipe, and the evaporation furnace is connected to the condensation chamber through another connecting pipe.

[0014] This invention discloses a zinc powder production equipment, which, compared with existing technologies, offers the following advantages: It includes an outer shell, an inner shell, a feed pipe, and an overflow plate. The outer shell is equipped with a cooling water inlet, a cooling chamber, a cooling water outlet, and an external feed inlet, all of which are connected to the cooling chamber. The cooling water inlet is used to communicate with cooling water, which enters the cooling chamber through it and flows out through the cooling water outlet. The inner shell and overflow plate are located within the cooling chamber. A first medium flow channel is provided between the inner wall of the cooling chamber and the outer wall of the inner shell. The inner shell is equipped with a condensation chamber and an internal feed inlet. One end of the feed pipe is connected to zinc vapor, and the other end of the feed pipe passes sequentially through the external feed inlet and the internal feed inlet, communicating with the condensation chamber. The internal feed inlet is located at the upper part of the inner shell, allowing zinc vapor to enter the upper part of the condensation chamber through the feed inlet. An overflow plate is fixed to the top of the inner shell, forming an upward-opening overflow cavity. A second medium flow channel is provided between the outer side of the overflow plate and the inner wall of the cooling cavity, and the first medium flow channel communicates with the second medium flow channel. By setting an overflow plate and forming an overflow cavity at the top edge of the inner shell, the initial distribution of cooling water is changed. Cooling water entering from the cooling inlet first undergoes liquid level storage and pressure equalization in the overflow cavity. When the liquid level overflows the overflow plate, the cooling water transforms into an annular overflow in the entire 360-degree circumference, flowing into the first medium flow channel through the second medium flow channel. The cooling water forms a uniformly distributed liquid film on the circumference of the outer wall of the inner shell, overcoming the local flow deviation and dead zone problems that are easily generated by conventional parallel pipelines or straight-through water jackets. The annular cooling medium can synchronously flush and transfer heat to the outer wall of the inner shell, thereby eliminating the local heat transfer differences in the circumference of the inner shell. This allows the condensation cavity wall of the inner shell to maintain a similar temperature at the same height section, forming a regular and stable condensation boundary condition. Zinc vapor enters the condensation chamber of the inner shell sequentially through the feed pipe, where it undergoes heat exchange and condenses on the inner wall of the shell. Because the annular overflow ensures the uniformity of the condensation chamber wall, the cooling rate experienced by the zinc vapor entering the condensation chamber tends to be consistent in the circumferential direction. This synchronizes the nucleation rate of zinc droplets and the kinetics of crystal growth, thereby narrowing the particle size distribution range of the precipitated zinc powder and improving the uniformity of the final product particle size. Attached Figure Description

[0015] Figure 1 This is a front view of the zinc powder condenser according to an embodiment of the present invention.

[0016] Figure 2 This is a side view of a zinc powder condenser according to an embodiment of the present invention.

[0017] Figure 3 This is a bottom view of the zinc powder condenser according to an embodiment of the present invention.

[0018] Figure 4 This is a front view of a zinc powder condenser according to another embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the connection structure between the zinc powder condenser and the melting furnace and the evaporation furnace in an embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the zinc powder production equipment according to an embodiment of the present invention.

[0021] In the picture: 10. Outer casing; 11. Cooling inlet; 12. Cooling chamber; 13. Cooling outlet; 14. External feed inlet; 15. Observation port; 20. Inner shell; 21. Side plate; 22. First included angle; 23. Top plate; 24. First medium flow channel; 25. Condensation chamber; 26. Inlet section; 27. Middle section; 28. Rear section; 29. ​​Inner feed port; 30. Exhaust port; 31. Collection bin; 32. Feed pipe; 40. Overflow plate; 41. Overflow outlet; 42. Overflow cavity; 43. Second medium flow channel; 50. Melting furnace; 51. Evaporator; 52. Screening machine; 53. Packaging machine; 54. Zinc powder condenser; 55. First airtight valve; 56. Buffer chamber; 57. Second airtight valve; 58. Connecting pipe; 59. Heating jacket; X, the height direction. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0024] In the description of this invention, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] like Figures 1 to 3 As shown, a zinc powder production device according to a preferred embodiment of the present invention includes: The outer casing 10 is provided with a cooling water inlet 11, a cooling cavity 12, a cooling water outlet 13, and an external feed inlet 14. The cooling water inlet 11, the cooling water outlet 13, and the external feed inlet 14 are connected to the cooling cavity 12. The inner shell 20 is located inside the outer shell 10. A first medium flow channel 24 is provided between the inner wall of the cooling cavity 12 and the outer wall of the inner shell 20. The inner shell 20 is provided with a condensation cavity 25 and an inner feed port 29. The inner feed port 29 is connected to the condensation cavity 25 and is located at the upper part of the inner shell 20. The feed pipe 32 has one end connected to zinc vapor and the other end connected to the condensation chamber 25 via the outer feed port 14 and the inner feed port 29. An overflow plate 40 is disposed inside the outer shell 10. The overflow plate 40 is connected around the edge of the top of the inner shell 20 to form an overflow cavity 42. The cooling water inlet 11 is connected to the overflow cavity 42. A second medium flow channel 43 is provided between the outer side of the overflow plate 40 and the inner wall of the cooling cavity 12. The second medium flow channel 43 is connected to the first medium flow channel 24.

[0026] The zinc powder production equipment of the present invention includes an outer shell 10, an inner shell 20, a feed pipe 32, and an overflow plate 40. The outer shell 10 is provided with a cooling water inlet 11, a cooling chamber 12, a cooling water outlet 13, and an external feed inlet 14, all of which are connected to the cooling chamber 12. The cooling water inlet 11 is used to communicate with cooling water, which enters the cooling chamber 12 through the cooling water inlet 11, and the cooling water in the cooling chamber 12 flows out through the cooling water outlet 13. The inner shell 20 and the overflow plate 40 are disposed within the cooling chamber 12. A first medium flow channel 24 is provided between the inner wall of the cooling chamber 12 and the outer wall of the inner shell 20. The inner shell 20 is provided with a condensation chamber 25 and an inner feed port 29. One end of the feed pipe 32 is connected to zinc vapor, and the other end of the feed pipe 32 passes through the outer feed port 14 and the inner feed port 29 in sequence and is connected to the condensation chamber 25. The inner feed port 29 is located at the upper part of the inner shell 20 so that zinc vapor can enter the upper part of the condensation chamber 25 through the feed port. The overflow plate 40 is fixed to the top of the inner shell 20. The overflow plate 40 and the inner shell 20 cooperate to form an upward-opening overflow chamber 42. A second medium flow channel 43 is provided between the outer side of the overflow plate 40 and the inner wall of the cooling chamber 12. The first medium flow channel 24 is connected to the second medium flow channel 43. By setting an overflow plate 40 at the top edge of the inner shell 20 and forming an overflow cavity 42, the initial distribution method of cooling water is changed. The cooling water entering from the cooling inlet 11 first undergoes liquid level storage and pressure equalization in the overflow cavity 42. When the liquid level overflows the overflow plate 40, the cooling water transforms into an annular overflow in the entire 360-degree circumference and flows into the first medium flow channel 24 through the second medium flow channel 43. The cooling water forms a uniformly distributed liquid film on the circumference of the outer wall of the inner shell 20, overcoming the problems of local flow deviation and dead zones that are easily generated by conventional parallel pipelines or straight-through water jackets. The annular cooling medium can synchronously flush and exchange heat on the outer wall of the inner shell 20, thereby eliminating the local heat exchange differences in the circumference of the inner shell 20. This allows the wall surface of the condensation cavity 25 of the inner shell 20 to maintain a similar temperature at the same height section, forming a regular and stable condensation boundary condition with a temperature gradient. Zinc vapor enters the condensation chamber 25 of the inner shell 20 through the feed pipe 32, where it undergoes heat exchange and condenses on the inner wall of the inner shell 20. Because the annular overflow ensures the temperature uniformity of the condensation chamber 25 wall, the cooling rate experienced by the zinc vapor entering the condensation chamber 25 tends to be consistent in the circumferential direction. This synchronizes the nucleation rate of zinc droplets and the kinetics of crystal growth, thereby narrowing the particle size distribution range of the precipitated zinc powder and improving the uniformity of the final product particle size.

[0027] It should be noted that the main particle size of the zinc powder produced by this invention is controlled at 100 mesh, wherein the zinc powder with a particle size of 140μm to 160μm accounts for no less than 95% of the mass.

[0028] As one embodiment, such as Figures 1 to 2As shown, the height of the overflow chamber 42 is set at 30mm-50mm, which can meet the needs of water storage and overflow.

[0029] Furthermore, such as Figures 1 to 2 As shown, the upper edge of the overflow plate 40 is provided with an overflow port 41, which is serrated. The serrated overflow port 41 divides the continuous overflow surface into multiple independent V-shaped flow sections. Even if there is a slight tilt or manufacturing tolerance in the main body of the equipment, the cooling water can still flow out along the circumferentially distributed troughs of the serrations, improving the equipment's tolerance to installation level and ensuring the circumferential consistency of the medium distribution. At the same time, the troughs of the serrated structure can act as a tip guide, breaking the surface tension of the liquid, so that even at low flow rates, the cooling water can be stably divided into multiple thin streams and flow down smoothly, increasing the adjustable range of the cooling medium flow rate.

[0030] As one embodiment, such as Figure 1 As shown, the outer casing 10 is provided with an observation port 15 whose height corresponds to that of the overflow port 41. The observation port 15 is sealed with glass so that the overflow situation of the overflow port 41 can be observed through the glass of the observation port 15.

[0031] Furthermore, such as Figures 1 to 2 As shown, the inlet water temperature of cooling water inlet 11 is set between 25℃ and 40℃. When the inlet water temperature is less than 25℃, the low-temperature cooling water causes the zinc vapor to be rapidly supercooled upon contact with the inner wall of the cooling chamber 12, quickly precipitating a large amount of ultrafine zinc powder. This fine powder is prone to agglomeration and oxidation, resulting in a fine particle size and wide distribution. When the inlet water temperature is higher than 40℃, the temperature difference between the cooling water and zinc vapor decreases, leading to a reduction in overall cooling efficiency. The lower section of the cooling chamber 12 becomes too hot, resulting in insufficient cooling of the zinc vapor and the formation of large zinc beads or lumps, reducing the yield of qualified zinc powder. The inlet water temperature of 25℃ to 40℃, combined with the top overflow plate 40, achieves axial gradient temperature control on the wall of the condensing chamber 25 while maintaining a uniform circumferential temperature. The cooling water forms a circumferentially distributed downward-flowing liquid film through the top overflow plate 40, continuously absorbing the latent heat of the zinc vapor during its downward flow, thus creating an axial temperature gradient on the wall of the condensing chamber 25: rapid cooling at the top, transitional cooling in the middle, and slow cooling at the bottom. The initial inlet water temperature of 25℃ to 40℃, combined with the axial temperature gradient, avoids sudden drops in local temperature caused by extremely low temperature cooling medium, and avoids abnormal grain growth or irregular agglomeration caused by excessive hot and cold alternation. This ensures the thermodynamic stability of zinc vapor nucleation and solidification crystallization processes, and further improves the particle size concentration of the produced zinc powder.

[0032] As one embodiment, such as Figure 1 As shown, the cooling water outlet 13 is located at the lower part of the outer casing 10 so that the cooling water flows sequentially along the second medium flow channel 43 and the first medium flow channel 24, and is discharged from the cooling water outlet 13.

[0033] As one embodiment, such as Figure 1 As shown, the inner shell 20 is provided with an exhaust port 30 for the discharge of exhaust gas.

[0034] Furthermore, such as Figure 1 As shown, this invention relies on the top overflow plate 40 to form a downstream water film, combined with an initial inlet water temperature of 25°C to 40°C, to create a three-section cooling gradient temperature field with a decreasing trend along the axial direction of the condensing chamber 25. The condensing chamber 25 is divided into an inlet section 26, a middle section 27, and a rear section 28 along the height direction X. The axial temperature gradient of the inlet section 26 is set at 80°C / m to 120°C / m. When the high-temperature zinc vapor of about 1000°C enters the condensing chamber 25, it needs to quickly remove a large amount of sensible heat and quickly leave the ultra-high temperature gaseous state range. If the gradient is too small or the cooling is too slow, the zinc vapor is prone to agglomeration into large droplets and coarse zinc particles due to prolonged high temperature. A moderately high gradient and rapid cooling allows the zinc vapor to quickly reach the saturation condensation temperature, and fine crystal nuclei are initially precipitated. The axial temperature gradient in the middle section 27 is set between 40℃ / m and 70℃ / m. This range is crucial for zinc powder particle growth. The gradient is gentle and controllable, allowing for controlled nucleus growth. It prevents excessively rapid cooling leading to a massive burst of ultrafine powder formation, nor excessively slow cooling causing uncontrolled particle growth. Under this gradient, zinc vapor condensation is highly synchronized, resulting in similar particle growth times and a narrower particle size distribution. The axial temperature gradient in the rear section 28 is set between 15℃ / m and 30℃ / m. In this range, the zinc powder has largely completed its solid-state phase transformation, and the lower temperature gradient is only used to slowly remove residual heat from the particles. The gentle tail-end temperature field avoids the thermal deposition of powder induced by localized overcooling of the container walls, i.e., the cold-wall powder adhesion effect. This prevents powder from sticking to the bottom of the condensation chamber 25 during the descent process, thus ensuring smooth powder discharge and stable particle size distribution.

[0035] Furthermore, such as Figure 1 As shown, the condensation chamber 25 has a dimension of L meters in the height direction X, with the inlet section 26, middle section 27, and rear section 28 each having a dimension of 1 / 3 * L meters. The 1 / 3 * L meter space of the inlet section 26 provides an interface for rapid cooling and precipitation of basic crystal nuclei; the 1 / 3 * L meter space of the middle section 27 ensures the core travel required for stable crystallization of zinc vapor attached to the crystal nuclei under saturated conditions; and the 1 / 3 * L meter space of the rear section 28 provides sufficient physical fall travel, allowing the solidified powder particles to achieve internal and external temperature equilibrium before leaving the strong heat exchange zone. The spatial division of the condensation chamber 25 in the height direction X conforms to the space and thermodynamic requirements for zinc powder forming, ensuring the final output particle size concentration.

[0036] Furthermore, such as Figure 4As shown, the inner shell 20 includes a side plate 21 and a top plate 23. The upper end of the side plate 21 is connected to the top plate 23, and the overflow plate 40 is connected to the top plate 23. A first medium flow channel 24 is provided between the side plate 21 and the inner wall of the cooling cavity 12. A first angle 22 is formed between the side plate 21 and the height direction X. The condensation cavity 25 is arranged with a smaller upper part and a larger lower part. In terms of heat exchange flow field, as the overflowing cooling water spreads along the inclined side plate 21, the mass of cooling water per unit area gradually decreases due to the gradual expansion of the outer wall circumference from top to bottom. Combined with the temperature rise brought by the heat absorption of the water flow, a gradient temperature field with a gradually decreasing heat flux along the axial direction is formed. At the same time, the radial temperature difference inside the rear section 28 of the condensation chamber 25 is reduced due to the weakening of the cooling intensity of the rear wall 28. In terms of airflow dynamics, the condensation chamber 25, which is narrow at the top and wide at the bottom, gradually increases the internal flow cross-sectional area. The flow rate of zinc vapor slows down during the downward process, prolonging the physical growth time of zinc crystals in the gentle temperature zone and improving the concentration of zinc powder particle size distribution. In terms of powder conveying, the expanding conical structure formed in the condensation chamber 25 creates a natural wall detachment space. When the solid zinc powder after condensation falls vertically under the action of gravity, it directly detaches from the inner wall of the side plate 21 and settles freely, avoiding continuous friction and high-temperature adhesion and agglomeration of powder on the wall, thereby ensuring smooth discharge and reducing the frequency of equipment cleaning.

[0037] Furthermore, such as Figure 4 As shown, the first included angle 22 is set between 15° and 20°. Setting the first included angle 22 to 15° to 20° ensures that the cooling water can be spread relatively evenly at its lower limit, maintaining sufficient heat exchange; while the upper limit prevents the walls of the condensation chamber 25 from becoming too cold, forming a gentle radial temperature field and weakening thermophoretic deposition. Simultaneously, the setting of the first included angle 22 has both airflow stabilization and deceleration effects, extending crystal growth time while avoiding eddy back-mixing. In powder conveying, it ensures that the zinc powder naturally detaches from the wall and flows smoothly out.

[0038] As one embodiment, such as Figure 1 and Figure 4As shown, the area of ​​the side plate 21 of the inner shell 20 is set between 11 square meters and 13 square meters. Based on a single evaporation and condensation system producing 1 ton of zinc powder per day, the flow rate of the cooling water inlet 11 is set between 60 liters / minute and 120 liters / minute. If the flow rate is too low, a continuous and complete overflow thin water film cannot be formed on the outer wall of the inner shell 20, potentially leading to water shortages or dry areas. The temperature of the condensation chamber 25 corresponding to these dry areas will rise sharply, resulting in insufficient cooling of the zinc vapor and the formation of large zinc particles. Conversely, if the flow rate of the cooling water inlet 11 is too high, the water film will be too thick and the water flow rate too fast, leading to excessively high overall heat exchange intensity on the outer wall of the inner shell 20. This results in a low wall temperature for the condensation chamber 25, causing rapid cooling of the entire condensation chamber 25 and the generation of a large amount of ultrafine zinc powder. Simultaneously, excessive flow increases the energy consumption of the circulating water pump and causes overflow splashing, increasing cooling water loss. Furthermore, excessively high top water pressure will cause a large difference in the thickness of the water film around the perimeter, widening the radial temperature difference. The flow rate of the cooling water inlet 11 is set within a suitable range, the water film is continuous and the thickness is relatively uniform, the condensation chamber 25 heats up slowly from top to bottom, matching the axial cooling requirements of zinc vapor; the axial temperature gradient of the condensation chamber 25 is stable, the particle size of the formed zinc powder is highly consistent, and the water and electricity consumption is balanced, with a moderate load on the circulating water cooling system.

[0039] In one embodiment, the thickness of the water film formed on the outer side wall of the side plate 21 is set at 5 mm.

[0040] As one embodiment, such as Figure 1 As shown, the zinc powder condenser 54 also includes a collection chamber 31, the upper part of which is connected to the inner shell 20 and communicates with the condensation chamber 25. The zinc powder formed inside the inner shell 20 is collected through the collection chamber 31.

[0041] A zinc powder production equipment, such as Figure 6 As shown, the system includes a melting furnace 50, an evaporator 51, a screening machine 52, a baling machine 53, and a zinc powder condenser 54, which are connected in sequence.

[0042] The melting furnace 50 is used to turn zinc ingots into molten zinc. Before heating the melting furnace 50, high-purity nitrogen (purity ≥99.999%) is introduced into the melting furnace 50 through a nitrogen protection system to form a positive pressure protective atmosphere of 0.03MPa. An oxygen detector monitors the oxygen content in the melting furnace 50 in real time, and the oxygen content is controlled to be less than or equal to 100ppm. The inner liner of the melting furnace 50 is a graphite liner, and the oxygen content control can prevent the graphite liner from oxidizing at high temperatures. The operating temperature of the melting furnace 50 is set between 450℃ and 500℃. After the temperature in the melting furnace 50 reaches 480℃ and stabilizes, the zinc ingot is put into the graphite liner. The zinc ingot is heated and gradually melted in the melting furnace 50 to form molten zinc, which flows continuously into the evaporation furnace 51 through the connecting pipe 58.

[0043] Evaporation furnace 51 evaporates the molten zinc to form zinc vapor. Evaporation furnace 51 is maintained at 1000°C to ensure the temperature inside remains within the set range. The oxygen content is controlled to be less than or equal to 50 ppm, and nitrogen is introduced into the evaporation furnace 51 to isolate it from air, prevent zinc vapor oxidation, and eliminate the risk of explosion from a mixture of zinc vapor and air. The zinc vapor enters the condenser through another connecting pipe 58.

[0044] Zinc vapor condenses in the condenser chamber 25 of the condenser to form zinc powder. The zinc powder in the condenser is discharged into the screening machine 52, and after being screened by the screening machine 52, the zinc powder falls into the packaging machine for packaging.

[0045] Furthermore, such as Figure 6 As shown, the zinc powder production equipment also includes a first airtight valve 55, a buffer chamber 56, and a second airtight valve 57. The lower end of the zinc powder condenser 54 is connected to the upper end of the buffer chamber 56 via the first airtight valve 55, and the lower end of the buffer chamber 56 is connected to the screening machine 52 via the second airtight valve 57. The first airtight valve 55 is connected to one end of the buffer chamber 56 in the height direction X, and the second airtight valve 57 is connected to the other end, thus forming a double-valve buffer chamber 56. During discharge, the first airtight valve 55 is first closed and the second airtight valve 57 is opened, discharging the zinc powder in the buffer chamber 56 into the screening machine 52. After screening, the powder falls into the packaging machine for packaging. Then, the second airtight valve 57 is closed and the first airtight valve 55 is opened, discharging the zinc powder in the condensation chamber 25 into the buffer chamber 56. This alternating opening and closing reduces the impact on the constant pressure environment inside the condensation chamber 25, controlling the internal pressure fluctuation of the condensation chamber 25 to less than or equal to ±0.01 MPa.

[0046] As one embodiment, such as Figures 5 to 6 As shown, the inner shell 20 is connected to the buffer chamber 56 through the collection chamber 31.

[0047] Furthermore, such as Figure 5 As shown, the zinc powder production equipment also includes a connecting pipe 58 and a heating jacket 59. The heating jacket 59 covers the outer circumference of the connecting pipe 58. The melting furnace 50 is connected to the evaporation furnace 51 through the connecting pipe 58, and the evaporation furnace 51 is connected to the condensation chamber 25 through another connecting pipe 58. The temperature of the heating jacket 59 is set at 1000℃ to prevent the zinc liquid and zinc vapor from condensing and blocking in the connecting pipe, ensuring the continuous and stable transmission of the zinc liquid discharged from the melting furnace 50 and the zinc vapor discharged from the evaporation furnace 51.

[0048] In summary, this invention provides a zinc powder production device, including a shell 10, an inner shell 20, a feed pipe 32, and an overflow plate 40. The shell 10 is provided with a cooling water inlet 11, a cooling chamber 12, a cooling water outlet 13, and an external feed inlet 14, all of which are connected to the cooling chamber 12. The cooling water inlet 11 is used to communicate with cooling water, which enters the cooling chamber 12 through the cooling water inlet 11, and the cooling water in the cooling chamber 12 flows out through the cooling water outlet 13. The inner shell 20 and the overflow plate 40 are disposed within the cooling chamber 12. A first medium flow channel 24 is provided between the inner wall of the cooling chamber 12 and the outer wall of the inner shell 20. The inner shell 20 is provided with a condensation chamber 25 and an inner feed port 29. One end of the feed pipe 32 is connected to zinc vapor, and the other end of the feed pipe 32 passes through the outer feed port 14 and the inner feed port 29 in sequence and is connected to the condensation chamber 25. The inner feed port 29 is located at the upper part of the inner shell 20 so that zinc vapor can enter the upper part of the condensation chamber 25 through the feed port. The overflow plate 40 is fixed to the top of the inner shell 20. The overflow plate 40 and the inner shell 20 cooperate to form an upward-opening overflow chamber 42. A second medium flow channel 43 is provided between the outer side of the overflow plate 40 and the inner wall of the cooling chamber 12. The first medium flow channel 24 is connected to the second medium flow channel 43. By setting an overflow plate 40 at the top edge of the inner shell 20 and forming an overflow cavity 42, the initial distribution method of cooling water is changed. The cooling water entering from the cooling inlet 11 first undergoes liquid level storage and pressure equalization in the overflow cavity 42. When the liquid level overflows the overflow plate 40, the cooling water transforms into an annular overflow in the entire 360-degree circumference and flows into the first medium flow channel 24 through the second medium flow channel 43. The cooling water forms a uniformly distributed liquid film on the circumference of the outer wall of the inner shell 20, overcoming the problems of local flow deviation and dead zones that are easily generated by conventional parallel pipelines or straight-through water jackets. The annular cooling medium can synchronously flush and exchange heat on the outer wall of the inner shell 20, thereby eliminating the local heat exchange differences in the circumference of the inner shell 20. This allows the wall surface of the condensation cavity 25 of the inner shell 20 to maintain a similar temperature at the same height section, forming a regular and stable condensation boundary condition with a temperature gradient. Zinc vapor enters the condensation chamber 25 of the inner shell 20 through the feed pipe 32, where it undergoes heat exchange and condenses on the inner wall of the inner shell 20. Because the annular overflow ensures the temperature uniformity of the condensation chamber 25 wall, the cooling rate experienced by the zinc vapor entering the condensation chamber 25 tends to be consistent in the circumferential direction. This synchronizes the nucleation rate of zinc droplets and the kinetics of crystal growth, thereby narrowing the particle size distribution range of the precipitated zinc powder and improving the uniformity of the final product particle size.

[0049] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A zinc powder condenser, characterized in that, include: The outer casing is provided with a cooling water inlet, a cooling chamber, a cooling water outlet, and an external feed inlet, wherein the cooling water inlet, the cooling water outlet, and the external feed inlet are connected to the cooling chamber; An inner shell is disposed inside the outer shell. A first medium flow channel is provided between the inner wall of the cooling cavity and the outer wall of the inner shell. The inner shell is provided with a condensation cavity and an inner feed port. The inner feed port is connected to the condensation cavity and is located at the upper part of the inner shell. A feed pipe, one end of which is connected to zinc vapor, and the other end of which is connected to the condensation chamber via the outer feed port and the inner feed port in sequence; An overflow plate is disposed inside the outer shell. The overflow plate is connected around the edge of the top of the inner shell to form an overflow cavity. The cooling water inlet is connected to the overflow cavity. A second medium flow channel is provided between the outer side of the overflow plate and the inner wall of the cooling cavity. The second medium flow channel is connected to the first medium flow channel.

2. The zinc powder condenser according to claim 1, characterized in that: The overflow plate has an overflow outlet on its upper edge, and the overflow outlet is serrated.

3. The zinc powder condenser according to claim 1, characterized in that: The inlet water temperature of the cooling water inlet is set at 25℃-40℃.

4. The zinc powder condenser according to claim 1, characterized in that: The cooling chamber is divided into an inlet section, a middle section, and a rear section along the height direction. The axial temperature gradient of the inlet section is set at 80℃ / m to 120℃ / m, the axial temperature gradient of the middle section is set at 40℃ / m to 70℃ / m, and the axial temperature gradient of the rear section is set at 15℃ / m to 30℃ / m.

5. The zinc powder condenser according to claim 4, characterized in that: The condensation chamber has a vertical dimension of L meters, wherein the dimensions of the inlet section, the middle section, and the rear section are 1 / 3 * L meters.

6. The zinc powder condenser according to claim 1, characterized in that: The inner shell includes a side plate and a top plate. The upper end of the side plate is connected to the top plate. The overflow plate is connected to the top plate. The first medium flow channel is provided between the side plate and the inner wall of the cooling cavity. The side plate forms a first angle with the height direction. The condensation cavity is arranged with a smaller top and a larger bottom.

7. The zinc powder condenser according to claim 6, characterized in that: The first included angle is set between 15° and 20°.

8. A zinc powder production equipment, characterized in that: It includes a melting furnace, an evaporation furnace, a screening machine, a baling machine, and a zinc powder condenser as described in any one of claims 1-7, wherein the melting furnace, the evaporation furnace, the zinc powder condenser, the screening machine, and the baling machine are connected in sequence.

9. The zinc powder production equipment according to claim 8, characterized in that: The zinc powder production equipment also includes a first airtight valve, a buffer chamber, and a second airtight valve. The lower end of the zinc powder condenser is connected to the upper end of the buffer chamber through the first airtight valve, and the lower end of the buffer chamber is connected to the screening machine through the second airtight valve.

10. The zinc powder production equipment according to claim 8, characterized in that: The zinc powder production equipment also includes a connecting pipe and a heating jacket. The heating jacket is fitted on the outer circumference of the connecting pipe. The melting furnace is connected to the evaporation furnace through the connecting pipe, and the evaporation furnace is connected to the condensation chamber through another connecting pipe.

Images