Energy-saving manufacturing device for lithium sulfate solution

Abstract

The present application belongs to the technical field of lithium sulfate production, and particularly relates to an energy-saving lithium sulfate solution manufacturing device, comprising an evaporation assembly, a separation assembly and a compression assembly. The evaporation assembly is used for preheating lithium sulfate solution raw materials and falling film evaporation concentration of the preheated lithium sulfate solution raw materials. The separation assembly is used for gas-liquid separation of secondary steam generated by the evaporation assembly. The compression assembly is used for pressurizing and warming the secondary steam treated by the separation assembly and recycling the secondary steam to the evaporation assembly for reuse. The compression assembly in the present application also uses a low-cost fixed-frequency motor as a driving device. The compression assembly in the present application can adjust the compression efficiency of the steam from the separation assembly according to the actual heat demand of the lower part of the partition plate in the tank A, so that the compression efficiency of the compression assembly matches the required steam amount, ensuring the balance of steam supply and demand and avoiding energy waste, thereby achieving the purpose of energy saving.

Description

Technical Field

[0001] This invention belongs to the field of lithium sulfate production technology, and in particular relates to an energy-saving manufacturing equipment for lithium sulfate solution. Background Technology

[0002] Lithium sulfate plays an important role in lithium-ion batteries, serving as an electrolyte to improve battery performance.

[0003] Lithium sulfate solution undergoes a concentration process during production, which utilizes evaporation equipment. This evaporation equipment includes a compressor, preheater, evaporator, and separator. The specific workflow is as follows: The compressor compresses secondary steam to generate high-temperature steam. This high-temperature steam enters the evaporator to evaporate and concentrate the preheated lithium sulfate solution. The concentrated lithium sulfate solution then returns to the preheater to further reheat the original lithium sulfate solution. The steam cooled during the evaporation and concentration process, along with some of the steam generated during concentration, becomes secondary steam. This secondary steam then enters the separator, where it separates from the condensate. The condensate remains in the separator, while the secondary steam is pressurized and heated by the compressor before re-entering the evaporator, thus completing the recycling of secondary steam and achieving energy savings.

[0004] In the above process, the pipeline from the secondary steam to the compressor, the pipeline from the high-temperature steam of the compressor to the evaporator, and the pipeline from the concentrated lithium sulfate solution to the preheater all need to be insulated, otherwise heat loss will occur. However, the method of adding an insulation layer to the outside of the pipeline requires the insulation layer to be of sufficient thickness, which inevitably leads to a thicker pipeline that occupies a large space. Moreover, it is not easy to detect if the insulation layer is damaged or broken, making maintenance troublesome and inefficient.

[0005] The preheater, evaporator, compressor, and separator are all independent units connected by pipelines, resulting in a large overall footprint for the equipment and making installation and transportation inconvenient.

[0006] In addition, in order to save on equipment manufacturing costs, fixed-frequency motors are currently used to drive the compressor. Fixed-frequency motors have poor speed regulation capabilities. When the required amount of steam changes, the poor speed regulation capability of the motor will lead to steam production exceeding the steam demand, resulting in energy waste and failing to achieve the goal of energy saving.

[0007] This invention designs an energy-saving lithium sulfate solution manufacturing equipment to solve the above problems. Summary of the Invention

[0008] Therefore, it is necessary to address the problems existing in current lithium sulfate solution manufacturing equipment by providing an energy-saving lithium sulfate solution manufacturing device. This device integrates the preheater, evaporator, compressor, and separator from existing technologies into a single design within tank A, effectively reducing the overall size of the equipment, saving installation space, and facilitating installation and transportation. The compression component in this invention also uses a low-cost fixed-frequency motor as the drive device. The compression component can adjust its compression efficiency of the vapor from the separation component according to the actual heat demand below the baffle in tank A, ensuring that the compression efficiency matches the required vapor quantity, guaranteeing a balance between vapor supply and demand without energy waste, thereby achieving energy saving. The guide section of the separation plate in the steam pipe B of the separation assembly can effectively guide the secondary steam in tank A to the separation section of the separation plate. The heavier condensate in the secondary steam enters the space below the separation plate through the separation holes on the separation section of the separation plate, and is further condensed by the concentrated lithium sulfate solution at the bottom of tank A before finally reaching the bottom of tank B. The lighter steam enters the space above the separation plate along the separation plate and enters the compression assembly under negative pressure for pressurization and heating for reuse. The steam above the separation plate does not lose much heat because it is covered with a heat insulation layer, thereby improving the pressurization and heating efficiency of the compression assembly, reducing the energy consumption of the fixed frequency motor, and achieving energy saving.

[0009] The above objectives are achieved through the following technical solutions: An energy-saving lithium sulfate solution manufacturing equipment for the concentration processing of lithium sulfate solution, comprising: An evaporation unit is used to preheat lithium sulfate solution feedstock and to concentrate the preheated lithium sulfate solution feedstock through falling film evaporation.

[0010] A separation component is used to separate the secondary vapor generated by the evaporation component into gas and liquid phases; the separation component is disposed within the evaporation component.

[0011] A compression assembly is used to pressurize and heat the secondary steam processed by the separation assembly and recycle the secondary steam to the evaporation assembly for reuse. The compression assembly includes a sealing shell fixed to the top of tank A. A fixing cover is fixed inside the sealing shell and also fixed to the top of tank A. A rotating shaft is rotatably mounted in a central circular groove of the fixing cover. The rotating shaft is connected to a fixed-frequency motor at the upper end of tank A. A disc is integrally connected to the lower end of the rotating shaft. The disc has a clearance fit with the inner wall of the fixing cover, and a clearance is formed between the disc and the inner wall of the fixing cover. The fixed sleeve has an exhaust port at its end that communicates with the annular space. The exhaust port supplies steam to the evaporation assembly through a hose B. A circular sleeve A driven by an electric push rod slides axially on the inner circumferential surface of the fixed sleeve. The circular sleeve A is integrally connected to a circular sleeve B through a conical sleeve. The circular sleeve B is connected to the separation assembly through a hose A. A circular sleeve C is rotatably disposed inside the circular sleeve B. Several circumferentially evenly distributed arc-shaped blades are integrally connected to the end of the circular sleeve C. The blades slide axially in a groove on the end face of the disc. The blades are in clearance fit with the inner wall of the conical sleeve.

[0012] In one embodiment, the evaporation assembly includes a tank A, which is fixed to the ground by three legs. A partition is provided in the tank A to divide it into upper and lower chambers. Falling film tubes connecting the upper and lower chambers of the tank A are densely distributed on the partition. The upper ends of the falling film tubes are higher than the partition. A liquid lifting pipe and a vapor pipe A connecting the upper and lower chambers of the tank A are respectively provided on the side and center of the partition. The upper end of the liquid lifting pipe is higher than the partition. The upper end of the vapor pipe A is connected to a flexible hose B. An inlet pipe connected to the liquid lifting pipe is installed on the bottom side wall of the tank A. The inlet pipe is in a tortuous state at the bottom of the tank A. A drain pipe A is provided at the lower end of the tank A.

[0013] In one embodiment, the outer side of the tank A is covered with a heat insulation layer.

[0014] In one embodiment, a switch valve A is installed on the drain pipe A, and a switch valve B is installed on the inlet pipe.

[0015] In one embodiment, the lower end of the vapor pipe A is closed, and the portion of the vapor pipe A below the partition is densely covered with horizontal branch pipes communicating with it. The diameter of the falling film pipe gradually increases from top to bottom, causing the thickness of the liquid film to gradually decrease and the surface area to gradually increase during the downward flow process, thereby accelerating the evaporation of the liquid film and improving the evaporation efficiency of the liquid film.

[0016] In one embodiment, the separation assembly includes a tank B located at the bottom inside a tank A. A steam pipe B is provided on the bottom side wall of the tank B. The steam pipe B includes an upper vertical section and a lower inclined section. The upper vertical section of the steam pipe B is located directly below the steam pipe A. The lower inclined section of the steam pipe B has a gas-liquid separation structure on both the inside and outside. A steam pipe C and a drain pipe B are respectively provided at the top and bottom of the tank B. The upper end of the steam pipe C is connected to a flexible hose A.

[0017] In one embodiment, a switching valve C is installed on the drain pipe B.

[0018] In one embodiment, the gas-liquid separation structure includes a separation plate disposed in the lower inclined portion of the steam pipe B. The separation plate divides the lower inclined portion of the steam pipe B into upper and lower spaces. The upper space of the lower inclined portion is covered with a heat insulation layer. The separation plate includes a guide portion and a separation portion. The guide portion is opposite to the upper opening of the steam pipe B. The separation portion is densely covered with inclined separation holes to facilitate the movement of condensate in the steam into the lower space inside the pipe.

[0019] In one embodiment, the steam pipe B is in a tortuous and winding state at the bottom of the tank A.

[0020] In one embodiment, two guide blocks are symmetrically arranged on the outer side of the circular sleeve A. The two guide blocks slide in the guide grooves on the inner wall of the fixed sleeve cover. The fixed sleeve cover is integrally connected to the top of the tank body A through a connecting block. A radial bearing is fitted between the rotating shaft and the fixed sleeve cover.

[0021] The beneficial effects of this invention are: 1. In this invention, the steam pipe C connecting tank B and the compression assembly is located inside tank A, so that the heat dissipated by the steam pipe C is used to heat the wall of the falling film pipe. In this invention, the upper end of the steam pipe A is located above the baffle inside tank A, so that the heat dissipated by the upper end of the steam pipe A is used to preheat the lithium sulfate solution on the baffle. In this invention, the inlet pipe is directly and effectively preheated because it is located in the concentrated lithium sulfate solution at the bottom of tank A. Since the outside of tank A is covered with a heat insulation layer, the heat dissipated by the steam pipe C, the upper end of the steam pipe A, and the concentrated lithium sulfate solution is directly used to concentrate the lithium sulfate solution and preheat the lithium sulfate solution without loss, thus achieving the purpose of energy saving.

[0022] 2. In this invention, the upper ends of steam pipe C and steam pipe A do not need to be covered with an insulation layer to prevent heat loss, which effectively reduces the volume of the pipeline. At the same time, the insulation layer on the outside of the pipeline will not be damaged, making maintenance easier and more efficient.

[0023] 3. The present invention integrates the preheater, evaporator, compressor and separator of the prior art into the design of tank A, which effectively reduces the overall volume of the equipment, occupies less area and saves installation space, and is convenient to install and transport.

[0024] 4. The compression component in this invention also uses a low-cost fixed-frequency motor as the driving device. The compression component in this invention can adjust its compression efficiency of the steam from the separation component according to the actual heat demand below the baffle in tank A, so that the compression efficiency of the compression component matches the required amount of steam, ensuring the balance between the supply and demand of steam without causing energy waste, thereby achieving the purpose of energy saving.

[0025] 5. The guide section of the separation plate in the steam pipe B of the separation assembly can effectively guide the secondary steam in tank A to the separation section of the separation plate. The heavier condensate in the secondary steam enters the space below the separation plate through the separation holes on the separation section of the separation plate, and is further condensed by the concentrated lithium sulfate solution at the bottom of tank A before finally reaching the bottom of tank B. The lighter steam enters the space above the separation plate along the separation plate and enters tank B under negative pressure, where it is pressurized and heated for reuse. The steam above the separation plate does not lose much heat because it is covered with a heat insulation layer, thereby improving the pressurization and heating efficiency of the compression assembly, reducing the energy consumption of the fixed frequency motor, and achieving energy saving. Attached Figure Description

[0026] Figure 1 This is an overall schematic diagram of the invention; Figure 2 This is a schematic cross-sectional view of the entire invention; Figure 3 This is a schematic cross-sectional view of the upper structure of the present invention; Figure 4 This is a schematic cross-sectional view of the bottom structure of the present invention; Figure 5 This is a schematic diagram of the falling film tube in this invention; Figure 6 This is a schematic diagram of the steam pipe A structure in this invention; Figure 7 This is a schematic diagram of the separate components in this invention; Figure 8 This is a schematic diagram of the axial cross-section of steam pipe B in this invention; Figure 9 This is a schematic diagram of the transverse cross-section of steam pipe B in this invention; Figure 10 This is a schematic cross-sectional view of the compression component in this invention; Figure 11 This is a schematic diagram of the fixed sleeve cover in this invention; Figure 12 This is a schematic diagram of the structure on the disk in this invention; Figure 13 This is a schematic diagram of the connection between the blade plate and the circular sleeve C from two perspectives in this invention; Figure 14 This is a schematic diagram showing the connection between the circular sleeve A, the conical sleeve, and the circular sleeve B in this invention; Labels in the diagram: 100. Evaporation assembly; 101. Support leg; 102. Tank A; 103. Drain pipe A; 104. Switch valve A; 105. Baffle plate; 106. Falling film pipe; 107. Liquid inlet pipe; 108. Switch valve B; 109. Steam pipe A; 110. Branch pipe; 111. Lifting pipe; 200. Separation assembly; 201. Tank B; 202. Steam pipe B; 203. Separation plate; 204. Guide section; 205. Separation section; 206. Separation hole; 207. Drain pipe B; 208. Switch valve C; 209. Steam pipe C; 300. Compression assembly; 301. Fixed sleeve cover; 302. Circular groove; 303. Exhaust port; 304. Guide groove; 305. Radial bearing; 306. Rotating shaft; 307. Disc; 308. Slide groove; 309. Circular sleeve A; 310. Guide block; 311. Conical sleeve; 312. Circular sleeve B; 313. Circular sleeve C; 314. Blade; 315. Fixed frequency motor; 316. Electric push rod; 317. Hose A; 318. Connector; 319. Hose B; 320. Sealing shell; 401. Insulation layer. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] like Figure 1-14 As shown, an energy-saving lithium sulfate solution manufacturing device is used for the concentration processing of lithium sulfate solution, comprising: Evaporation assembly 100 is used to preheat lithium sulfate solution raw material and to concentrate the preheated lithium sulfate solution raw material by falling film evaporation.

[0031] Separation component 200 is used to perform gas-liquid separation on the secondary vapor generated by evaporation component 100; the separation component 200 is disposed inside evaporation component 100.

[0032] A compression assembly 300 is used to pressurize and heat the secondary steam processed by the separation assembly 200 and circulate the secondary steam back to the evaporation assembly 100 for reuse. The compression assembly 300 includes a sealing shell 320 fixed to the top of the tank A102. A fixing cover 301 is fixed inside the sealing shell 320 and also fixed to the top of the tank A102. A rotating shaft 306 is rotatably mounted in a central circular groove 302 of the fixing cover 301. The rotating shaft 306 is connected to a fixed-frequency motor 315 at the upper end of the tank A102. A disc 307 is integrally connected to the lower end of the rotating shaft 306. The disc 307 is clearance-fitted with the inner wall of the fixing cover 301, and a clearance is formed between the disc 307 and the inner wall of the fixing cover 301. The fixed sleeve 301 forms an annular space, and its end has an exhaust port 303 communicating with the annular space. The exhaust port 303 supplies steam to the evaporation assembly 100 through a hose B319. A circular sleeve A309 driven by an electric push rod 316 slides axially on the inner circumferential surface of the fixed sleeve 301. The circular sleeve A309 is integrally connected to a circular sleeve B312 through a conical sleeve 311. The circular sleeve B312 is connected to the separation assembly 200 through a hose A317. A circular sleeve C313 is rotatably disposed inside the circular sleeve B312. Several circumferentially evenly distributed arc-shaped blades 314 are integrally connected to the end of the circular sleeve C313. The blades 314 slide axially in a groove 308 on the end face of the disc 307. The blades 314 are clearance-fitted with the inner wall of the conical sleeve 311.

[0033] In this invention, the steam pipe C209 connecting the tank B201 and the compression assembly 300 is located inside the tank A102, so that the heat dissipated by the steam pipe C209 is used to heat the wall of the falling film pipe 106. In this invention, the upper end of the steam pipe A109 is located above the partition 105 inside the tank A102, so that the heat dissipated by the upper end of the steam pipe A109 is used to preheat the lithium sulfate solution on the partition 105. In this invention, the liquid inlet pipe 107 is directly and effectively preheated because it is located in the concentrated lithium sulfate solution at the bottom of the tank A102. Since the outside of the tank A102 is covered with a heat insulation layer 401, the heat dissipated by the steam pipe C209, the upper end of the steam pipe A109 and the concentrated lithium sulfate solution is directly used to concentrate the lithium sulfate solution and preheat the lithium sulfate solution without loss, thus achieving the purpose of energy saving.

[0034] In this invention, the upper ends of steam pipe C209 and steam pipe A109 do not need to be covered with an insulation layer to prevent heat loss, which effectively reduces the volume of the pipeline. At the same time, the insulation layer on the outside of the pipeline will not be damaged, making maintenance easier and more efficient.

[0035] This invention integrates the preheater, evaporator, compressor and separator of the prior art into the design of tank A102, which effectively reduces the overall volume of the equipment, occupies a small area and saves installation space, and is convenient to install and transport.

[0036] The compression component 300 in this invention also uses a low-cost fixed-frequency motor 315 as the driving device. The compression component 300 can adjust its compression efficiency of the steam from the separation component 200 according to the actual heat demand below the partition 105 in the tank A102, so that the compression efficiency of the compression component 300 matches the required amount of steam, ensuring the balance between the supply and demand of steam without causing energy waste, thereby achieving the purpose of energy saving.

[0037] The guide portion 204 of the separation plate 203 in the steam pipe B of the separation assembly 200 can effectively guide the secondary steam in the tank A102 to the separation portion 205 of the separation plate 203. The heavier condensate in the secondary steam enters the space below the separation plate 203 through the separation hole 206 on the separation portion 205 of the separation plate 203. It is further condensed by the concentrated lithium sulfate solution at the bottom of the tank A102 and finally reaches the bottom of the tank B201. The lighter steam enters the space above the separation plate 203 along the separation plate 203 and enters the tank B201 under the action of negative pressure. It is then pressurized and heated for reuse. The steam above the separation plate 203 does not lose much heat because it is covered with a heat insulation layer 401, thereby improving the pressurization and heating efficiency of the compression assembly 300, reducing the energy consumption of the fixed frequency motor 315, and achieving the purpose of energy saving.

[0038] In a further embodiment, such as Figure 1-4 As shown, the evaporation assembly 100 includes a tank A102, which is fixed to the ground by three legs 101. A partition 105 divides the tank A102 into upper and lower chambers. Falling film tubes 106, connecting the upper and lower chambers of the tank A102, are densely distributed on the partition 105. The upper ends of the falling film tubes 106 are higher than the partition 105. Connections to the tank are respectively provided on the sides and center of the partition 105. The upper and lower chambers of tank A102 have a liquid lifting pipe 111 and a steam pipe A109. The upper end of the liquid lifting pipe 111 is higher than the partition 105. The upper end of the steam pipe A109 is connected to the hose B319. The bottom side wall of the tank A102 is equipped with an inlet pipe 107 that is connected to the liquid lifting pipe 111. The inlet pipe 107 is bent and twisted at the bottom of the tank A102. The lower end of the tank A102 is provided with a drain pipe A103.

[0039] In a further embodiment, such as Figure 1-2 As shown, the outer side of the tank body A102 is covered with a heat insulation layer 401.

[0040] In a further embodiment, such as Figure 1-2 As shown, a switching valve A104 is installed on the drain pipe A103, and a switching valve B108 is installed on the inlet pipe 107.

[0041] In a further embodiment, such as Figure 4 , 6 As shown, the lower end of the steam pipe A109 is closed, and the portion of the steam pipe A109 below the partition 105 is densely covered with horizontal branch pipes 110 communicating with it. The branch pipes 110 allow the high-temperature steam in the steam pipe A109 to uniformly fill the space below the partition 105 in a horizontal flow manner, thereby enabling the steam to uniformly heat all the falling film pipes 106. Figure 3 , 5 As shown, the diameter of the falling film tube 106 gradually increases from top to bottom, which causes the thickness of the liquid film to gradually decrease and the surface area to gradually increase during the downward flow process, thereby accelerating the evaporation of the liquid film and improving the evaporation efficiency of the liquid film.

[0042] In a further embodiment, such as Figure 2 , 7As shown in Figure 8, the separation component 200 includes a tank B201, which is located at the bottom of the tank A102. A steam pipe B202 is provided on the bottom side wall of the tank B201. The steam pipe B202 includes an upper vertical part and a lower inclined part. The upper vertical part of the steam pipe B202 is located directly below the steam pipe A109. The lower inclined part of the steam pipe B202 has a gas-liquid separation structure inside and outside. A steam pipe C209 and a drain pipe B207 are respectively provided at the top and bottom of the tank B201. The upper end of the steam pipe C209 is connected to the hose A317.

[0043] In a further embodiment, such as Figure 7 As shown, a switch valve C208 is installed on the drain pipe B207.

[0044] In a further embodiment, such as Figure 8 , 9 As shown, the gas-liquid separation structure includes a separation plate 203, which is disposed in the lower inclined portion of the steam pipe B202. The separation plate 203 divides the lower inclined portion of the steam pipe B202 into upper and lower spaces. The upper space of the lower inclined portion is covered with a heat insulation layer 401. The separation plate 203 includes a guide portion 204 and a separation portion 205. The guide portion 204 is opposite to the upper end of the steam pipe B202. The separation portion 205 is densely covered with inclined separation holes 206 to facilitate the movement of condensate in the steam into the lower space inside the pipe.

[0045] In a further embodiment, such as Figure 7 , 8 As shown, the steam pipe B202 is in a tortuous and winding state at the bottom of the tank A102.

[0046] In a further embodiment, such as Figure 10 , 11 As shown in Figure 14, two guide blocks 310 are symmetrically arranged on the outer side of the circular sleeve A309. The two guide blocks 310 slide within the guide grooves 304 on the inner wall of the fixed sleeve cover 301, as shown in Figure 14. Figure 3 , 10 As shown, the fixed cover 301 is integrally connected to the top of the tank body A102 via a connecting block, and a radial bearing 305 is fitted between the rotating shaft 306 and the fixed cover 301.

[0047] The operation flow of this invention is as follows: In the initial state, switch valves A104 and C208 are closed, the liquid level at the bottom of tank A102 is higher than the lower slope of inlet pipe 107 and steam pipe B202, and the concentrated lithium sulfate solution at the bottom of tank A102 is at a high temperature.

[0048] The fixed-frequency motor 315 is started. The fixed-frequency motor 315 drives the blade 314 and the sleeve C313 to rotate synchronously and rapidly via the rotating shaft 306 and the disc 307. The rotation of the blade 314 creates a negative pressure in the steam pipe C209 at the upper end of tank B201. Under the negative pressure in tank A102, the secondary steam below the baffle 105 enters tank B201 through steam pipe B202. The secondary steam entering tank B201 then enters the fixed cover 301 through steam pipe C209 under the negative pressure. As the circular sleeve C313 enters the fixed sleeve cover 301, the space between the conical sleeve 311 and the disc 307 gradually decreases radially. Therefore, the secondary steam is pressurized and heated as it moves around the fixed sleeve cover 301 under the action of the blade 314. The pressurized and heated secondary steam enters the steam pipe A109 through the exhaust port 303 and the hose B319. The high-temperature steam entering the steam pipe A109 enters the space below the partition 105 inside the tank A102 through the branch pipe 110 and heats all the falling film pipes 106 evenly.

[0049] The lithium sulfate solution raw material reaches the baffle 105 through the inlet pipe 107 and the lifting pipe 111, maintaining the liquid level on the baffle 105 at a certain height. The liquid level on the baffle 105 is flush with the upper end of the falling film pipe 106, allowing the lithium sulfate solution on the baffle 105 to flow downwards in a liquid film state from the upper end of the falling film pipe 106 along the inner wall of the falling film pipe 106. As the liquid film flows downwards along the inner wall of the falling film pipe 106, the thickness of the liquid film gradually decreases and the evaporation area gradually increases due to the gradually increasing diameter of the falling film pipe 106 from top to bottom, thereby improving the evaporation efficiency of the falling film pipe 106. When the liquid film reaches the lower end of the falling film pipe 106, it is effectively concentrated and falls to the bottom of the tank A102 under its own weight. During the process of the lithium sulfate solution passing through the bend of the inlet pipe 107, the lithium sulfate solution is effectively preheated by the high-temperature concentrated lithium sulfate solution at the bottom of the tank A102. When the solution level at the bottom of tank A102 reaches a certain height, open valve A104 to discharge a portion of the concentrated lithium sulfate solution and keep the liquid level at the bottom of tank A102 always higher than the lower inclined part of inlet pipe 107 and steam pipe B202.

[0050] During the process of the secondary steam in tank A102 moving into tank B201 through steam pipe B202, the secondary steam moves along the space above the separation plate 203 into tank B201 under the guidance of the separation plate 203. The condensate in the secondary steam in the space above the separation plate 203 will enter the space below the separation plate 203 through the separation hole 206 during the movement. Because the space above the separation plate 203 is covered with a heat insulation layer 401, the heat loss of the secondary steam in the space above the separation plate 203 is very small. As a result, the fixed frequency motor 315 only needs to consume less energy to pressurize and heat the secondary steam, thereby reducing the energy consumption of the fixed frequency motor 315 and improving the pressurization and heating efficiency of the blade 314 on the secondary steam. Furthermore, because the outer side of the space below the separation plate 203 is covered with a heat insulation layer 401, the space below the separation plate 203 will exchange heat with the concentrated lithium sulfate solution at the bottom of the tank A102. As a result, the temperature in the space below the separation plate 203 in the steam pipe B202 will decrease, and the mixture of condensate and steam in the hole below the separation plate 203 will further condense and eventually reach the bottom of the tank B201. When the condensate level at the bottom of the tank B201 reaches a certain height, the switch valve C208 will be opened to discharge the condensate at the bottom of the tank B201.

[0051] When the liquid film in the falling film pipe 106 inside tank A102 requires less heat, three electric push rods 316 can be activated to drive the circular sleeve C313, conical sleeve 311, circular sleeve B312, circular sleeve C313 and blade 314 to move upward synchronously, thereby reducing the amount of secondary steam entering the fixed cover 301 through the steam pipe C209, and thus controlling the amount of steam entering the space below the partition 105 inside tank A102 through the exhaust port 303, hose B319 and steam pipe A109. When the liquid film in the falling film pipe 106 inside tank A102 requires a large amount of heat, three electric push rods 316 can be activated to drive the circular sleeve C313, conical sleeve 311, circular sleeve B312, circular sleeve C313 and blade 314 to move downward synchronously. This increases the amount of secondary steam entering the fixed cover 301 through the steam pipe C209, thereby controlling the amount of steam entering the area below the partition 105 inside tank A102 through the exhaust port 303, hose B319 and steam pipe A109. This achieves the purpose of controlling the amount of steam in tank A102, thereby ensuring that the compression efficiency of the compression assembly 300 matches the required amount of steam, ensuring a balance between steam supply and demand without energy waste, and thus achieving energy saving.

Claims

1. An energy-saving lithium sulfate solution manufacturing equipment for the concentration processing of lithium sulfate solution, characterized in that, include: An evaporation assembly is used to preheat lithium sulfate solution feedstock and to concentrate the preheated lithium sulfate solution feedstock through falling film evaporation. A separation component is used to separate the secondary vapor generated by the evaporation component into gas and liquid phases; the separation component is disposed within the evaporation component. A compression assembly is used to pressurize and heat the secondary steam processed by the separation assembly and recycle the secondary steam to the evaporation assembly for reuse. The compression assembly includes a sealing shell fixed to the top of tank A. A fixing cover is fixed inside the sealing shell and also fixed to the top of tank A. A rotating shaft is rotatably mounted in a central circular groove of the fixing cover. The rotating shaft is connected to a fixed-frequency motor at the upper end of tank A. A disc is integrally connected to the lower end of the rotating shaft. The disc has a clearance fit with the inner wall of the fixing cover, and a clearance is formed between the disc and the inner wall of the fixing cover. The fixed sleeve has an exhaust port at its end that communicates with the annular space. The exhaust port supplies steam to the evaporation assembly through a hose B. A circular sleeve A driven by an electric push rod slides axially on the inner circumferential surface of the fixed sleeve. The circular sleeve A is integrally connected to the circular sleeve B through a conical sleeve. The circular sleeve B is connected to the separation assembly through a hose A. A circular sleeve C is rotatably disposed inside the circular sleeve B. Several circumferentially evenly distributed arc-shaped blades are integrally connected to the end of the circular sleeve C. The blades slide axially in the grooves on the end face of the disc. The blades are in clearance fit with the inner wall of the conical sleeve. The evaporation assembly includes a tank A, which is fixed to the ground by three legs. A partition is provided in the tank A to divide it into upper and lower chambers. Falling film tubes connecting the upper and lower chambers of the tank A are densely distributed on the partition. The upper ends of the falling film tubes are higher than the partition. A liquid lifting pipe and a vapor pipe A connecting the upper and lower chambers of the tank A are respectively provided on the side and center of the partition. The upper end of the liquid lifting pipe is higher than the partition. The upper end of the vapor pipe A is connected to a flexible hose B. An inlet pipe connected to the liquid lifting pipe is installed on the bottom side wall of the tank A. The inlet pipe is in a tortuous state at the bottom of the tank A. A drain pipe A is provided at the lower end of the tank A. The separation assembly includes a tank B located at the bottom inside the tank A. A steam pipe B is provided on the bottom side wall of the tank B. The steam pipe B includes an upper vertical part and a lower inclined part. The upper vertical part of the steam pipe B is located directly below the steam pipe A. The lower inclined part of the steam pipe B has a gas-liquid separation structure inside and outside. A steam pipe C and a drain pipe B are respectively provided at the top and bottom of the tank B. The upper end of the steam pipe C is connected to the hose A. The gas-liquid separation structure includes a separation plate disposed in the lower inclined portion of the steam pipe B. The separation plate divides the lower inclined portion of the steam pipe B into upper and lower spaces. The upper space of the lower inclined portion is covered with a heat insulation layer. The separation plate includes a guide portion and a separation portion. The guide portion is opposite to the upper end of the steam pipe B. The separation portion is densely covered with inclined separation holes to facilitate the movement of condensate in the steam into the lower space inside the pipe.

2. The energy-saving lithium sulfate solution manufacturing equipment according to claim 1, characterized in that, The outer side of the tank A is covered with a heat insulation layer.

3. The energy-saving lithium sulfate solution manufacturing equipment according to claim 1, characterized in that, A switch valve A is installed on the drain pipe A, and a switch valve B is installed on the inlet pipe.

4. The energy-saving lithium sulfate solution manufacturing equipment according to claim 1, characterized in that, The lower end of the steam pipe A is closed, and the portion of the steam pipe A below the partition is densely covered with horizontal branch pipes that communicate with it. The diameter of the falling film pipe gradually increases from top to bottom.

5. The energy-saving lithium sulfate solution manufacturing equipment according to claim 1, characterized in that, A switch valve C is installed on the drain pipe B.

6. The energy-saving lithium sulfate solution manufacturing equipment according to claim 1, characterized in that, The steam pipe B is in a tortuous and winding state at the bottom of the tank A.

7. The energy-saving lithium sulfate solution manufacturing equipment according to claim 1, characterized in that, Two guide blocks are symmetrically arranged on the outer side of the circular sleeve A. The two guide blocks slide in the guide grooves on the inner wall of the fixed sleeve cover. The fixed sleeve cover is integrally connected to the top of the tank body A through a connecting block. A radial bearing is fitted between the rotating shaft and the fixed sleeve cover.

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