Evaporation forced-effect spraying flash evaporation equipment

Abstract

The invention relates to the technical field of aluminum oxide production, and discloses evaporation forced-effect jet flash evaporation equipment which comprises a storage tank, a heating box is arranged outside the storage tank, an air guide pipe is arranged on the side wall of the storage tank, a flash evaporator is arranged outside the air guide pipe, a conveying pipe is arranged in the heating box, and a flash evaporator is arranged in the conveying pipe. A discharging table is fixedly connected to the lower side of the flash evaporator, a mounting block is fixedly connected to the side wall of the flash evaporator, a flow dividing pipe is fixedly connected to one end of the mounting block, a guiding assembly is arranged on the side wall of the flow dividing pipe, and a flow guiding block is fixedly connected to the interior of the flow dividing pipe. The steam pushes the cleaning assembly to rotate, meanwhile, the steam firstly passes through the flow guide block, and tiny crystals mixed in the steam are preliminarily filtered under the filtration of the flow guide block, so that the effects of preheating the mother liquor in advance, realizing self-circulation of the mother liquor, reducing the use of a circulating pump and further reducing the power consumption of the device can be achieved.

Description

Technical Field

[0001] This invention relates to the field of alumina production technology, specifically to an evaporation forced-efficiency spray flash evaporation device. Background Technology

[0002] Alumina production refers to the industrial process of extracting and preparing high-purity alumina from bauxite through a series of physicochemical processes. Its core product, alumina, is a key raw material for the electrolytic production of metallic aluminum and is also widely used in ceramics, refractory materials, abrasives, and other fields. The mainstream industrial process is the Bayer process. In addition, for bauxite with a low aluminum-to-silicon ratio, a sintering method or a "Bayer-sintering combined method" is used. This involves adding auxiliary materials such as lime and sodium carbonate for high-temperature sintering to convert aluminum into soluble sodium aluminate for further processing. Alumina production requires precise control of key parameters such as leaching temperature, alkali concentration, and decomposition time to improve aluminum recovery and reduce energy consumption.

[0003] The related alumina production uses a multi-effect evaporator to concentrate the circulating mother liquor in order to achieve alkali recovery and concentration control. However, the related evaporation process relies on a high-power circulating pump to maintain the flow of the liquid and heat exchange efficiency within the forced effect, which results in high power consumption of the device and further increases operating costs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a forced-effect jet flash evaporation device, which solves the problem of high power consumption and increased operating costs caused by the concentration of circulating mother liquor in multi-effect evaporation devices during alumina production.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a forced-effect jet flash evaporation device, comprising a storage tank, a heating box externally disposed on the storage tank, a gas guide pipe disposed on the side wall of the storage tank, a flash evaporator externally disposed on the gas guide pipe, a conveying pipe internally disposed on the heating box, a discharge platform fixedly connected to the lower side of the flash evaporator, an installation block fixedly connected to the side wall of the flash evaporator, a diversion pipe fixedly connected to one end of the installation block, a guide assembly disposed on the side wall of the diversion pipe, a flow guide block fixedly connected internally to the diversion pipe, a third gas guide hole being formed internally on the flow guide block, and a cleaning assembly disposed internally on the third gas guide hole.

[0006] By adopting the above technical solution, the vacuum pump in the flash evaporator is started to create a low-pressure environment inside, and the circulation pump in the storage tank is turned on to send the mother liquor into the heating box for heating. Subsequently, the heated mother liquor flows into the distribution pipe in the flash evaporator through the feed pipe under the action of pressure difference. In the low-pressure environment, the boiling point of the liquid phase of the mother liquor decreases and it evaporates rapidly. Then, the vapor moves upward along the distribution pipe, while the solid phase such as alumina crystals falls to the discharge platform under the action of gravity. After that, the cleaning component rotates in the guide block under the push of the vapor. The vapor is initially filtered and separated into small crystals by the guide block, and then further guided and filtered by the guide component. The rotation of the cleaning component not only guides the vapor, but also breaks it up through shearing action, increasing the contact area with the mother liquor. Finally, the vapor returns to the storage tank through the gas pipe to exchange heat with the mother liquor to preheat it. At this time, the circulation pump is turned off, and the mother liquor is forced from the storage tank into the heating box by the vapor pressure, realizing the self-circulation of the mother liquor, reducing the use of the circulation pump, and reducing the energy consumption of the equipment.

[0007] Preferably, the guide assembly includes a first umbrella cap block, the inside of which is fixedly connected to the outside of the diversion pipe, and a second umbrella cap block is fixedly connected to the outside of the first umbrella cap block, the outside of which is disposed outside the flash evaporator.

[0008] Preferably, the umbrella cap block one has an air guide hole two inside, the umbrella cap block two has an air guide hole one inside, and the side wall of the umbrella cap block one has a debris removal hole.

[0009] Preferably, the cleaning assembly includes a rotating rod, the outside of which is rotatably connected to the inside of the guide block, a fan blade is fixedly connected to the bottom end of the rotating rod, a second cleaning block is fixedly connected to the top end of the rotating rod, and a first cleaning block is fixedly connected to the middle part of the rotating rod.

[0010] Preferably, the outer side of the first cleaning block is rotatably connected to the inside of the first umbrella cap block, the sidewall of the first cleaning block is disposed outside the debris removal hole, and the outer side of the second cleaning block is disposed inside the second umbrella cap block.

[0011] Preferably, the sidewall of the second cleaning block is rotatably connected to the outside of the first air guide hole, and the sidewall of the first cleaning block is rotatably connected to the outside of the second air guide hole.

[0012] Preferably, a transmission rod is fixedly connected inside the diversion pipe, a baffle block is rotatably connected outside the transmission rod, and a tension spring is provided on the side wall of the guide block.

[0013] Preferably, one end of the tension spring is disposed inside the baffle block, and the sidewall of the baffle block is disposed inside the diverter pipe.

[0014] Preferably, both the first umbrella cap block and the second umbrella cap block are umbrella cap shaped, and the outer part of the second umbrella cap block is disposed inside the air duct.

[0015] Preferably, the sidewall of the feed pipe is located inside the flash evaporator, the outside of the feed pipe is located inside the diversion pipe, and the guide block has a convex shape with an inclination angle.

[0016] Working principle: First, the vacuum pump in the flash evaporator is started to create a low-pressure environment. The mother liquor is sent to the heating box for heating through the storage tank circulation pump. Under the action of pressure difference, it enters the distribution pipe through the conveying pipe. The low pressure lowers the boiling point of the liquid phase of the mother liquor and causes it to evaporate rapidly. The vapor rises along the distribution pipe. The solid phase, such as alumina crystals, falls into the discharge platform under the action of gravity, realizing efficient solid-liquid separation. At this point, the rising steam drives the fan blades to rotate, which in turn drives the rotating rod to rotate, which in turn drives cleaning block one and cleaning block two to rotate. The steam then passes through the guide block, umbrella cap block one, and umbrella cap block two for filtration. Among them, air guide hole three intercepts small crystals, while larger crystals accumulate at the bottom of the guide block, which in turn drives the baffle block to rotate and discharge them. Then, large crystal particles are captured between umbrella cap block one and umbrella cap block two, and are scraped off from the impurity removal hole by the rotating cleaning block two to the discharge platform. The cleaning component simultaneously crushes the steam to increase the contact area and scrapes the air guide hole in real time to prevent blockage. The purified steam is then returned to the storage tank via the gas pipe, where it exchanges heat with the mother liquor to achieve preheating. Subsequently, the circulation pump is turned off, and the preheated mother liquor is squeezed into the heating box by the steam pressure to form a self-circulating flow. This process replaces the power of the circulation pump, reduces power consumption, and improves the alumina yield through graded recovery and crystallization.

[0017] This invention provides an evaporation forced-effect jet flash evaporation device. It has the following beneficial effects: 1. This invention uses steam to drive the cleaning assembly to rotate. Simultaneously, the steam first passes through a guide block, where it undergoes preliminary filtration to remove tiny crystals mixed in with the steam. Subsequently, the steam is guided and further filtered by a guide assembly. The rotating cleaning assembly guides the steam and generates shear force to further break it up, thereby increasing the contact area between the steam and the mother liquor. The steam then flows into the storage tank through a gas pipe, where it exchanges heat with the mother liquor, raising its temperature. At the same time, the circulation pump is shut off, and the steam forces the mother liquor from the storage tank into the heating chamber. This achieves preheating of the mother liquor, enabling self-circulation of the mother liquor, reducing the use of the circulation pump, and thus reducing the power consumption of the device.

[0018] 2. In this invention, steam passes sequentially through the guide block, umbrella cap block one, and umbrella cap block two for filtration and screening, and then enters the gas guide pipe. Small crystals are isolated under the guide block and the gas guide hole three and fall into the interior of the discharge platform, while larger crystals are intercepted by umbrella cap block one and the impurity removal hole and fall to the lower side of the guide block for accumulation. When the crystals accumulate to a certain extent, they push the baffle block to rotate, and then the crystals detach from the diversion pipe and fall to the discharge platform. Subsequently, large crystal particles come with the steam to the space between umbrella cap block one and umbrella cap block two and are intercepted, while cleaning block two rotates and sweeps the crystals from the impurity removal hole and they fall to the discharge platform. This achieves the effect of efficiently recovering alumina crystals doped in the steam, thereby improving the alumina formation rate.

[0019] 3. In this invention, a certain amount of alumina crystals will be generated inside the first and second umbrella cap blocks, which will block the first and second air guide holes. The first and second cleaning blocks scrape the crystals on the inner walls of the first and second umbrella cap blocks, causing the crystals to fall off and be recycled. This can avoid the nozzle from becoming blocked, thereby ensuring the stable spraying state of the device and further improving the alumina recovery efficiency. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of an evaporation forced-effect jet flash evaporation device proposed in this invention; Figure 2 This is a cross-sectional schematic diagram of the internal structure of the flash evaporator in a forced-effect jet flash evaporation device proposed in this invention; Figure 3 This is a partial structural diagram of the cleaning block two of the forced evaporation jet flash evaporation equipment proposed in this invention; Figure 4 This is a cross-sectional schematic diagram of the internal structure of the umbrella cap block of the forced evaporation jet flash evaporation device proposed in this invention; Figure 5 This is a partial structural diagram of the impurity removal hole of a forced-effect jet flash evaporation device proposed in this invention; Figure 6 This is a partial structural diagram of the cleaning block of a forced-effect jet flash evaporation device proposed in this invention; Figure 7 This is a cross-sectional schematic diagram of the internal structure of the umbrella-shaped cap block 2 of the forced evaporation jet flash evaporation device proposed in this invention; Figure 8 This is a cross-sectional schematic diagram of the internal structure of the diversion pipe of a forced-effect jet flash evaporation device proposed in this invention.

[0021] The components are as follows: 1. Storage tank; 2. Heating box; 3. Flash evaporator; 4. Discharge platform; 5. Mounting block; 6. Diverter pipe; 7. Guide assembly; 71. Umbrella cap block one; 72. Umbrella cap block two; 8. Cleaning assembly; 81. Rotating rod; 82. Fan blade; 83. Cleaning block one; 84. Cleaning block two; 9. Transmission rod; 10. Material stop block; 11. Tension spring; 12. Air guide hole one; 13. Air guide hole two; 14. Air guide hole three; 15. Impurity removal hole; 16. Conveying pipe; 17. Guide block; 18. Air guide pipe. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see the appendix Figure 1 - Appendix Figure 4 This invention provides a forced-effect jet flash evaporation device, including a storage tank 1, a heating box 2 externally disposed on the storage tank 1, a gas guide pipe 18 disposed on the side wall of the storage tank 1, a flash evaporator 3 externally disposed on the gas guide pipe 18, a conveying pipe 16 internally disposed on the heating box 2, a discharge platform 4 fixedly connected to the lower side of the flash evaporator 3, a mounting block 5 fixedly connected to the side wall of the flash evaporator 3, a diversion pipe 6 fixedly connected to one end of the mounting block 5, a guide component 7 disposed on the side wall of the diversion pipe 6, a flow guide block 17 fixedly connected internally to the diversion pipe 6, a third gas guide hole 14 opened internally on the flow guide block 17, and a cleaning component 8 disposed internally on the third gas guide hole 14.

[0024] Specifically, by activating the vacuum pump inside the flash evaporator 3, a low-pressure environment is created inside the flash evaporator 3. Then, the circulation pump installed inside the storage tank 1 is activated to feed the mother liquor into the heating box 2 for heating. Subsequently, the heated mother liquor, under the pressure difference between the heating box 2 and the flash evaporator 3, flows through the feed pipe 16 into the diversion pipe 6 installed in the flash evaporator 3. Due to the low-pressure environment, the boiling point of the liquid phase in the mother liquor changes, making it easier for the liquid phase to evaporate. The liquid phase evaporates and moves upward along the internal channel of the diversion pipe 6, while the solid phase, i.e., alumina crystals, falls along the internal channel of the diversion pipe 6 into the discharge platform 4 under its own weight. Afterwards, the cleaning component 8 rotates inside the guide block 17 under the push of steam. Simultaneously, the steam first passes through the guide block 17, where it undergoes preliminary filtration to remove tiny crystals mixed in with the steam. Then, the steam is guided and further filtered by the guide component 7, while the cleaning component 8 rotates to guide the steam and generate shear force to further break it up, thereby increasing the contact area between the subsequent steam and the mother liquor. The steam then flows into the storage tank 1 along the gas guide pipe 18, where it exchanges heat with the mother liquor, causing the mother liquor temperature to rise. At the same time, the circulation pump is turned off, and the steam forces the mother liquor from the storage tank 1 into the heating box 2. This achieves the effect of preheating the mother liquor, enabling the mother liquor to circulate itself, reducing the use of the circulation pump, and thus reducing the power consumption of the device.

[0025] See appendix Figure 3 - Appendix Figure 5 The guide assembly 7 includes a first umbrella cap block 71, which is internally fixedly connected to the outside of the diversion pipe 6. A second umbrella cap block 72 is fixedly connected to the outside of the first umbrella cap block 71, and the second umbrella cap block 72 is externally located outside the flash evaporator 3. The first umbrella cap block 71 has a second air guide hole 13 inside, and the second umbrella cap block 72 has a first air guide hole 12 inside. The side wall of the first umbrella cap block 71 has a dirt removal hole 15. Both the first umbrella cap block 71 and the second umbrella cap block 72 are umbrella cap shaped, and the second umbrella cap block 72 is externally located outside the flash evaporator 3. The cleaning block 83 is rotatably connected to the inside of the umbrella cap block 71. The side wall of the cleaning block 83 is located outside the impurity removal hole 15. The cleaning block 84 is located inside the umbrella cap block 72. The transmission rod 9 is fixedly connected inside the diverter 6. The baffle block 10 is rotatably connected to the outside of the transmission rod 9. The side wall of the guide block 17 is provided with a tension spring 11. One end of the tension spring 11 is located inside the baffle block 10. The side wall of the baffle block 10 is located inside the diverter 6.

[0026] Specifically, the steam passes through the guide block 17, umbrella cap block 1 71, and umbrella cap block 2 72 in sequence for filtration and screening, and then enters the steam guide pipe 18. During this process, the apertures of the steam guide hole 3 14, steam guide hole 2 13, and steam guide hole 1 12 increase in size sequentially. This aperture setting is used to sequentially screen out alumina crystals of different sizes mixed in the steam. Small crystals are isolated under the guide block 17 and steam guide hole 3 14 and fall into the interior of the discharge platform 4, while larger crystals are intercepted by umbrella cap block 1 71 and impurity removal hole 15 and fall to the lower side of the guide block 17 to accumulate. When the crystals accumulate to a certain extent, they push the baffle block 1. The crystals rotate around the transmission rod 9, and under the assistance of the steam and their own weight, they detach from the diversion pipe 6 at an angle and fall to the discharge platform 4. When the impurities are discharged, the baffle block 10 is reset under the pull of the tension spring 11. Then, the large crystal particles come with the steam to the space between the first umbrella cap block 71 and the second umbrella cap block 72 and are intercepted. The large crystal particles then slide down the surface of the first umbrella cap block 71 into the interior of the second umbrella cap block 72. The second cleaning block 84 rotates and sweeps the crystals from the impurity removal hole 15 and they fall to the discharge platform 4. This can achieve the effect of efficiently recovering the alumina crystals doped in the steam, thereby improving the alumina formation rate.

[0027] See appendix Figure 3 Appendix Figure 6 and attached Figure 7 The cleaning assembly 8 includes a rotating rod 81, which is rotatably connected to the inside of the guide block 17. A fan blade 82 is fixedly connected to the bottom end of the rotating rod 81, a second cleaning block 84 is fixedly connected to the top end of the rotating rod 81, a first cleaning block 83 is fixedly connected to the middle part of the rotating rod 81, the side wall of the second cleaning block 84 is rotatably connected to the outside of the first air guide hole 12, and the side wall of the first cleaning block 83 is rotatably connected to the outside of the second air guide hole 13.

[0028] Specifically, when the device operates for a long time, a certain amount of alumina crystals will be generated inside the first umbrella cap block 71 and the second umbrella cap block 72, which will block the first air guide hole 12 and the second air guide hole 13. The first cleaning block 83 and the second cleaning block 84 rotate continuously under the action of the rotating rod 81, thereby scraping the crystals on the inner wall of the first umbrella cap block 71 and the second umbrella cap block 72. The crystals fall off and are recycled, thereby avoiding the blockage of the spray nozzle, ensuring the stability of the spray state of the device, and further improving the alumina recovery efficiency.

[0029] See appendix Figure 1 and attached Figure 8 The sidewall of the feed pipe 16 is located inside the flash evaporator 3, and the outside of the feed pipe 16 is located inside the diversion pipe 6. The guide block 17 is a convex shape with an inclined angle.

[0030] Specifically, the feed pipe 16 is used to collect and transport the steam generated by the device to the inside of the storage tank 1, while the shape of the guide block 17 ensures that the collected crystals can slide down the surface of the guide block 17 under their own weight.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An evaporation-enhanced jet flash evaporation apparatus, characterized by, The utility model provides a kind of material storage tank, including the material storage tank (1), the outside of the material storage tank (1) is provided with heating box (2), the sidewall of the material storage tank (1) is provided with gas guide pipe (18), the outside of the gas guide pipe (18) is provided with flash evaporator (3), the inside of the heating box (2) is provided with material conveying pipe (16), the lower side of the flash evaporator (3) is fixedly connected with discharge platform (4), the sidewall of the flash evaporator (3) is fixedly connected with mounting block (5), one end of the mounting block (5) is fixedly connected with shunt pipe (6), the sidewall of the shunt pipe (6) is provided with guide assembly (7), the inside of the shunt pipe (6) is fixedly connected with flow guide block (17), the inside of the flow guide block (17) is provided with gas guide hole three (14), the inside of the gas guide hole three (14) is provided with cleaning assembly (8).

2. An evaporation-enhanced jet flash evaporation apparatus according to claim 1, wherein The guide assembly (7) includes umbrella cap block one (71), the inside of the umbrella cap block one (71) is fixedly connected to the outside of shunt pipe (6), the outside of the umbrella cap block one (71) is fixedly connected with umbrella cap block two (72), the outside of the umbrella cap block two (72) is provided in the outside of flash evaporator (3).

3. An evaporation-enhanced jet flash evaporation apparatus according to claim 2, wherein, The inside of the umbrella cap block one (71) is provided with gas guide hole two (13), the inside of the umbrella cap block two (72) is provided with gas guide hole one (12), the sidewall of the umbrella cap block one (71) is provided with impurity removal hole (15).

4. The evaporation-enhanced jet flash evaporation apparatus of claim 1, wherein, The cleaning assembly (8) includes rotating rod (81), the outside of the rotating rod (81) is rotatably connected in the inside of flow guide block (17), the bottom of the rotating rod (81) is fixedly connected with fan blade (82), the top of the rotating rod (81) is fixedly connected with cleaning block two (84), the middle of the rotating rod (81) is fixedly connected with cleaning block one (83).

5. An evaporation-enhanced jet flash evaporation apparatus according to claim 4, wherein The outside of the cleaning block one (83) is rotatably connected in the inside of the umbrella cap block one (71), the sidewall of the cleaning block one (83) is provided in the outside of impurity removal hole (15), the outside of the cleaning block two (84) is provided in the inside of the umbrella cap block two (72).

6. An evaporation-enhanced jet flash evaporation apparatus according to claim 4, wherein The sidewall of the cleaning block two (84) is rotatably connected in the outside of gas guide hole one (12), the sidewall of the cleaning block one (83) is rotatably connected in the outside of gas guide hole two (13).

7. The evaporation-enhanced jet flash evaporation apparatus of claim 1, wherein, The inside of the shunt pipe (6) is fixedly connected with transmission rod (9), the outside of the transmission rod (9) is rotatably connected with material blocking block (10), the sidewall of the flow guide block (17) is provided with tension spring (11).

8. An evaporation-enhanced jet flash evaporation apparatus according to claim 7, wherein One end of the tension spring (11) is provided in the inside of the material blocking block (10), the sidewall of the material blocking block (10) is provided in the inside of the shunt pipe (6).

9. The evaporation-enhanced jet flash evaporation apparatus of claim 2, wherein, The umbrella cap block one (71) and umbrella cap block two (72) are both umbrella cap shape, and the outside of the umbrella cap block two (72) is provided in the inside of the gas guide pipe (18).

10. The evaporation-enhanced jet flash evaporation apparatus of claim 1, wherein, The sidewall of the material conveying pipe (16) is provided in the inside of the flash evaporator (3), the outside of the material conveying pipe (16) is provided in the inside of the shunt pipe (6), and the flow guide block (17) is convex shape with inclination.

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