Magnesium chloride production device with preheating function

Abstract

The magnesium chloride production device with the preheating function comprises a base, an outer heat preservation tank, a heating tank and the like, the heating tank is arranged in the outer heat preservation tank, and a preheating barrel, a conical bottom evaporation tank and a steam spraying pipe are arranged in the heating tank; brine enters the preheating barrel from the feeding pipe and flows along the wall under the action of the spiral guide plate, waste heat generated by the cone-bottom evaporation tank is used for preheating the brine through the preheating pipe, steam is used for preheating the brine through the preheating barrel, the brine enters the cone-bottom evaporation tank to form falling film flow after temperature rise, and the brine is heated and evaporated under the action of the steam; a scraping mechanism is arranged in the conical-bottom evaporation tank and can be used for scraping scale on the inner wall of the conical-bottom evaporation tank; the device fully utilizes waste heat, improves the energy utilization rate, ensures the product quality, reduces equipment faults, reduces the production cost, and is suitable for large-scale production of magnesium chloride.

Description

Technical Field

[0001] This utility model relates to the technical field of magnesium chloride production equipment, and in particular to a magnesium chloride production device with a preheating function. Background Technology

[0002] Currently, magnesium chloride is typically produced using the brine evaporation method. This process involves heating and evaporating the brine, causing the moisture to gradually dissipate and promoting the crystallization of magnesium chloride. However, existing magnesium chloride production equipment has significant shortcomings in the preheating stage.

[0003] First, traditional preheating relies on a single heat source, resulting in a significant waste of heat without effective recovery and reuse. Second, during preheating, salt in the brine easily deposits on the pipe walls, forming scale, which significantly reduces heat transfer efficiency, affects preheating performance, and increases the complexity and cost of equipment maintenance. Finally, static preheating causes uneven heating of the brine, which can easily lead to localized overheating or uncontrolled crystallization, resulting in unstable product quality and reduced overall production efficiency.

[0004] In conclusion, it is urgent to develop a magnesium chloride production device with preheating function that can solve the above problems. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a magnesium chloride production device with preheating function to solve the problems mentioned in the background art.

[0006] To achieve the above technical objectives, the present invention provides a magnesium chloride production device with a preheating function, comprising a base, an outer insulation tank on the base, a top cover on the top of the outer insulation tank, a heating tank inside the outer insulation tank, and a preheating cylinder, a conical bottom evaporator, and a steam spray pipe arranged sequentially from top to bottom inside the heating tank. An air inlet pipe connected to the steam spray pipe is provided at the lower part of the outer insulation tank, and an exhaust pipe connected to the heating tank is provided at the upper part. A discharge pipe connected to the conical bottom evaporator is provided at the bottom of the outer insulation tank. The upper end of the preheating cylinder is rotatably connected to the top cover, and the lower end is located inside and rotatably connected to the conical bottom evaporator. A preheating pipe with vertical connections is provided inside the preheating cylinder. A spiral guide plate is provided between the preheating pipe and the inner wall of the preheating cylinder. A motor is provided on the top cover, and the motor drives the preheating cylinder to rotate. A plurality of material distribution holes are arranged in a circumferential array on the section of the preheating cylinder located in the conical bottom evaporator.

[0007] Furthermore, the preheating tube has a connecting seat at its axis, which is connected to the inner wall of the preheating tube by several fins. A transmission rod is provided on the connecting seat, and the output shaft of the motor is connected to the transmission rod. The lower end of the transmission rod extends into the conical bottom evaporator and is equipped with a scraping mechanism.

[0008] Furthermore, a mounting ring is fixedly connected to the lower part of the top cover, and a thrust ball bearing is mounted on the mounting ring. The upper race of the thrust ball bearing is fixedly connected to the upper folded edge of the preheating cylinder. An exhaust pipe and a feed pipe opposite to the spiral guide plate are mounted on the top cover. A ball bearing is mounted on the upper part of the conical bottom evaporator, and the inner ring of the ball bearing is fixedly connected to the outer wall of the preheating cylinder.

[0009] Furthermore, a coupling is provided between the motor and the transmission rod. The transmission rod is hollow and a push rod is installed inside it. The coupling is equipped with a telescopic mechanism that drives the push rod to rise and fall. The scraping mechanism includes a connecting rod and a scraper hinged to the transmission rod. One end of the connecting rod is hinged to the push rod, and the other end is hinged to the middle of the scraper.

[0010] Furthermore, the telescopic mechanism includes a bushing and a drive mechanism. The two ends of the bushing are respectively engaged with the keyways of the transmission rod and the output shaft of the motor. The push rod is fixedly connected to the bushing. A slip ring is provided on the bushing, and a shift fork is provided on the slip ring. The drive mechanism drives the bushing to rise and fall through the shift fork.

[0011] Compared with the prior art, the beneficial effects of this utility model include:

[0012] 1. This utility model uses a spiral guide plate inside the preheating cylinder. Under the action of the spiral guide plate, the brine flows along the wall due to centrifugal force, reducing static retention and salt deposition of the brine. The waste heat generated by the cone-bottom evaporator is preheated by the preheating pipe and the steam flowing through the cone-bottom evaporator through the preheating cylinder. This preheating method makes full use of the waste heat and steam heat energy generated by the cone-bottom evaporator, improves energy utilization, and avoids energy waste caused by the brine directly entering the high-temperature environment.

[0013] 2. This utility model uses a scraping mechanism inside the preheating cylinder to scrape away scale buildup on the inner wall of the preheating tube during rotation, preventing scale accumulation from affecting heat transfer efficiency, extending equipment lifespan, and reducing maintenance costs. In terms of product quality, the uniform distribution of material in the preheating cylinder ensures even heating of the brine, and the falling film flow in the cone-bottom evaporator avoids local overheating or uncontrolled crystallization, ensuring the purity and particle size uniformity of the magnesium chloride product. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a magnesium chloride production device with preheating function provided by this utility model;

[0015] Figure 2 This is an exploded view of the internal structure of a magnesium chloride production device with preheating function provided by this utility model;

[0016] Figure 3 This is a cross-sectional view of a magnesium chloride production device with preheating function provided by this utility model;

[0017] Figure 4 This is a schematic diagram of the scraping mechanism of a magnesium chloride production device with preheating function provided by this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] Reference Figure 1 This utility model provides a magnesium chloride production device with preheating function, including a base 1, an outer insulation tank 2 mounted on the base 1, a top cover 3 mounted on the top of the outer insulation tank 2, and a heating tank 4 mounted inside the outer insulation tank 2. Inside the heating tank 4, from upper right to lower left, are arranged a preheating cylinder 5, a conical bottom evaporator 6, and a steam spray pipe 7. The lower part of the outer insulation tank 2 is provided with an inlet pipe 202 connected to the steam spray pipe 7 for introducing steam; the upper part is provided with an exhaust pipe 201 connected to the heating tank 4 for discharging waste gas; the bottom of the outer insulation tank 2 is provided with a discharge pipe 203 connected to the conical bottom evaporator 6 for discharging the produced material; the top cover 3 is provided with a waste gas pipe 301 for discharging waste heat from the conical bottom evaporator 6, a motor 304, and a feed pipe 302.

[0020] Reference Figure 2 , 3 Below the top cover 3, there is a mounting ring 8 that is fixedly connected to it. A thrust ball bearing 801 is installed on the mounting ring 8. The upper seat ring of the thrust ball bearing 801 is fixedly connected to the upper folded edge of the preheating cylinder 5, which can support the rotation of the preheating cylinder 5. A ball bearing 601 is installed on the upper part of the cone-bottom evaporator 6. The inner ring of the ball bearing 601 is fixedly connected to the outer wall of the preheating cylinder 5. The preheating cylinder 5, located on a section of the cone-bottom evaporator 6, has several feeding holes 504 arranged in a circular array on its upper circumference. The rotating preheating cylinder 5 can evenly spray the preheated brine into the cone-bottom evaporator 6 through the feeding holes 504 to avoid local overheating or uncontrolled crystallization.

[0021] The preheating cylinder 5 is equipped with a preheating pipe 501 that is connected vertically. A spiral guide plate 502 is provided between the preheating pipe 501 and the inner wall of the preheating cylinder 5. The feed pipe 302 is directly opposite the spiral guide plate 502. A connecting seat 503 is provided at the axis of the preheating pipe 501. The connecting seat 503 is connected to the inner wall of the preheating pipe 501 by several fins, which can increase the contact area between the waste heat discharged from the conical bottom evaporator 6 and the preheating pipe 501 and improve the heat transfer efficiency. A transmission rod 9 is fixedly provided on the connecting seat 503. The motor 304 is connected to the transmission rod 9 by a coupling 303, thereby driving the preheating cylinder 5 to rotate. The lower end of the transmission rod 9 extends into the conical bottom evaporator 6 and is provided with a scraping mechanism for scraping off the crystals on the inner wall of the conical bottom evaporator 6.

[0022] To facilitate understanding of this utility model, the following is combined with... Figure 1 - Figure 3 The working principle of this solution will be explained in detail:

[0023] The brine enters the preheating cylinder 5 through the feed pipe 302. Under the action of the spiral guide plate 502, it flows along the wall due to centrifugal force, reducing static retention and salt deposition. The waste heat generated by the conical bottom evaporator 6 and the steam flowing through it preheat the brine through the preheating pipe 501 and the preheating cylinder 5, respectively. The preheated brine forms a falling film flow on the inner wall of the conical bottom evaporator 6 and is heated to 120-150℃ under the continuous action of steam, causing the water to evaporate and form a supersaturated MgCl2 solution. At the same time, the scraping mechanism contacts the inner wall of the conical bottom evaporator 6 when necessary to scrape off the crystallized layer, preventing the crystallized layer from being too thick and affecting the evaporation effect. Finally, the slurry flows out through the bottom outlet of the conical bottom evaporator 6 and is cooled and crystallized to complete the production of magnesium chloride.

[0024] Reference Figure 4 The transmission rod 9 is hollow and contains a push rod 901. The coupling 303 contains a bushing 307 and a drive mechanism (not shown in the figure, but can be an electric push rod or a cylinder in actual applications). The two ends of the bushing 307 are respectively engaged with the keyways of the output shafts of the transmission rod 9 and the motor 304. The push rod 901 is fixedly connected to the bushing 307. The bushing 307 is provided with a slip ring 305 and a shift fork 306. The drive mechanism drives the bushing 307 to rise and fall through the shift fork 306, thereby realizing the rising and falling of the push rod 901.

[0025] The scraping mechanism includes a connecting rod 903 and a scraper 902 hinged to the transmission rod 9. One end of the connecting rod 903 is hinged to the push rod 901, and the other end is hinged to the middle of the scraper 902. When the push rod 901 rises and falls, the scraper at the end of the scraper 902 can contact or separate from the inner wall of the cone-bottom evaporator 6 through the connecting rod 903 to remove the crystal layer on it.

[0026] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A magnesium chloride production apparatus with preheating function, comprising a base, an outer insulation tank mounted on the base, a top cover mounted on the top of the outer insulation tank, a heating tank mounted inside the outer insulation tank, and, from top to bottom, a preheating cylinder, a conical-bottom evaporator, and a steam spray pipe mounted inside the heating tank; an inlet pipe connected to the steam spray pipe mounted at the bottom of the outer insulation tank, an exhaust pipe connected to the heating tank mounted at the top, and a discharge pipe connected to the conical-bottom evaporator mounted at the bottom of the outer insulation tank, characterized in that: The upper end of the preheating cylinder is rotatably connected to the upper cover, and the lower end is disposed inside the conical bottom evaporator and rotatably connected thereto. A preheating pipe with vertical communication is disposed inside the preheating cylinder. A spiral guide plate is disposed between the preheating pipe and the inner wall of the preheating cylinder. A motor is disposed on the upper cover, and the motor drives the preheating cylinder to rotate. A number of material distribution holes are arranged in a circular array on the upper circumference of the section of the preheating cylinder located in the conical bottom evaporator.

2. A magnesium chloride production apparatus with preheating function according to claim 1, characterized in that: The preheating tube has a connecting seat at its axis. The connecting seat is connected to the inner wall of the preheating tube by several fins. A transmission rod is provided on the connecting seat. The output shaft of the motor is connected to the transmission rod. The lower end of the transmission rod extends into the conical bottom evaporator and is provided with a scraping mechanism.

3. The magnesium chloride production device with preheating function according to claim 2, characterized in that: A mounting ring is fixedly connected to the lower part of the top cover. A thrust ball bearing is installed on the mounting ring. The upper race of the thrust ball bearing is fixedly connected to the upper folded edge of the preheating cylinder. An exhaust pipe and a feed pipe opposite to the spiral guide plate are installed on the top cover. A ball bearing is installed at the upper part of the conical bottom evaporator. The inner ring of the ball bearing is fixedly connected to the outer wall of the preheating cylinder.

4. The device for producing magnesium chloride with a preheating function according to claim 2 or 3, characterized in that: A coupling is provided between the motor and the transmission rod. The transmission rod is hollow and a push rod is provided inside. The coupling is provided with a telescopic mechanism that drives the push rod to rise and fall. The scraping mechanism includes a connecting rod and a scraper hinged to the transmission rod. One end of the connecting rod is hinged to the push rod, and the other end is hinged to the middle of the scraper.

5. The magnesium chloride production device with preheating function according to claim 4, characterized in that: The telescopic mechanism includes a bushing and a drive mechanism. The two ends of the bushing are respectively engaged with the keyways of the transmission rod and the output shaft of the motor. The push rod is fixedly connected to the bushing. A slip ring is provided on the bushing, and a shift fork is provided on the slip ring. The drive mechanism drives the bushing to rise and fall through the shift fork.

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