An axial flow fin-fan concentrated brine crystallization salt system and method of use thereof

Abstract

The application discloses an axial flow type phenyl mirror concentrated brine crystallization salt system and a use method thereof, and relates to the field of salt production, which comprises a phenyl mirror heat collection system and an axial flow heat collection system, a support is arranged below the phenyl mirror heat collection system, the axial flow heat collection system is arranged on the support, the axial flow heat collection system is located directly below the phenyl mirror heat collection system, and the light focused by the phenyl mirror heat collection system can irradiate the axial flow heat collection system to heat the axial flow heat collection system, the axial flow heat collection system is provided with an inner cavity containing concentrated brine, a steam outlet, a crystallization interface and a concentrated brine inlet which are in communication with the inner cavity. The application realizes zero-energy-consumption heat collection and concentrated brine crystallization, and solves the problems of long duration, low efficiency and large power consumption of existing concentrated brine disposal.

Description

Technical Field

[0001] This invention belongs to the field of concentrated brine crystallization treatment technology, specifically relating to an axial flow Fresnel lens concentrated brine crystallization salt system, and also to a method of using the axial flow Fresnel lens concentrated brine crystallization salt system. Background Technology

[0002] Saline-alkali areas contain abundant saline water, including groundwater and agricultural drainage. A significant amount of brine is also extracted using salt extraction methods. Utilizing this saline water resource will be crucial for alleviating the freshwater supply and demand imbalance in these areas. Existing desalination technologies, such as thermal and membrane methods, produce large amounts of concentrated brine. These are typically processed using salt fields, where the brine is placed in evaporation ponds and heated by sunlight to increase its temperature, promoting evaporation and causing salt crystals to precipitate and accumulate. This process is time-consuming and inefficient. In contrast, factories using steam to heat the concentrated brine have low heat transfer efficiency and high energy consumption.

[0003] Chinese Patent CN117509792B discloses a concentrated brine crystallization and water collection device, including a concentrated brine storage tank, an evaporator, a main control cabinet, a cooler, a water collection tank, and a base. The evaporator has a heating wire on its inner wall, electrically connected to the main control cabinet. The water collection tank contains a condensation collection component, which forms a hot flow loop and a cold flow loop with the inner wall of the tank. The water collection tank is connected in series with the concentrated brine storage tank, the evaporator, and the hot flow loop via a steam pipe, forming a loop. The water collection tank is also connected in series with the cooler via a cooling pipe, forming another loop. In this application, steam flows through a steam inlet and outlet pipe within the water collection tank, passing sequentially through a manifold and multiple distribution plates. The steam flows intermittently within the manifold and distribution plates, where it is cooled and condensed, forming water droplets. These droplets automatically fall and collect before flowing out through a drain pipe. While this device can achieve self-cooling to improve condensation and water collection, it requires evaporation in an evaporator. Steam flows through the steam inlet and outlet pipes within the water collection tank, passing sequentially through a manifold and multiple distribution plates, where it is cooled and condensed. The entire process still suffers from long processing time, low efficiency, and high energy consumption. Therefore, researching a low-energy, high-efficiency concentrated brine crystallization system is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide an axial flow Fresnel mirror concentrated brine crystallization system and its usage method to solve the problems of long processing time, low efficiency and high power consumption in existing concentrated brine treatment systems.

[0005] The technical solution adopted in this invention is an axial-flow Fresnel mirror concentrated brine crystallization salt system, including a Fresnel mirror heat collection system and an axial-flow heat collection system. A support is installed below the Fresnel mirror heat collection system, and the axial-flow heat collection system is installed on the support. The axial-flow heat collection system is located directly below the Fresnel mirror heat collection system, and the light focused by the Fresnel mirror heat collection system can irradiate the axial-flow heat collection system for heating. The axial-flow heat collection system has an inner cavity for containing concentrated brine and a steam outlet, a crystallization interface, and a concentrated brine inlet communicating with the inner cavity.

[0006] Preferably, the steam outlet is connected to the steam inlet of the steam heat exchanger, which is mounted on a support and has a brine inlet and a brine outlet. The brine outlet is connected to the concentrated brine inlet of the axial flow heat collection system.

[0007] Preferably, the above-mentioned axial flow heat collection system includes a solid-liquid-gas separation pipe and a heat collection pipe. The solid-liquid-gas separation pipe is installed inside the heat collection pipe. The head end of the solid-liquid-gas separation pipe extends out of the heat collection pipe and is fixedly connected to one end of a power slip ring. The other end of the power slip ring is connected to a concentrated brine inlet. A steam outlet is opened near the head end of the heat collection pipe, and a crystallization interface is opened below it. A through hole communicating with the heat collection pipe is provided near the inner end of the solid-liquid-gas separation pipe.

[0008] Preferably, the solid-liquid-gas separation tube is a hollow tubular structure with a brine inlet at the head end. A power slip ring is connected to the brine inlet and can drive the solid-liquid-gas separation tube to rotate. A collar is provided on the side of the brine inlet near the inner end of the solid-liquid-gas separation tube, and a shoulder is provided on the side of the collar near the inner end of the solid-liquid-gas separation tube. A bushing is provided to seal the end of the solid-liquid-gas separation tube, and a spiral salt scraper is provided between the bushing and the shoulder. Support bearings are fixedly connected to both the collar and the bushing. The solid-liquid-gas separation tube is rotatably connected to the heat collection tube through the support bearings.

[0009] Preferably, the steam heat exchanger has a cavity, a brine inlet at the head end and a brine outlet at the tail end. The brine outlet is connected to the concentrated brine inlet of the axial flow heat collection system. The side wall of the steam heat exchanger has a distilled water outlet near the head end and a steam inlet near the tail end. The steam inlet is connected to the steam interface of the axial flow heat collection system. A heat-conducting pipe is installed inside the steam heat exchanger. The head end of the heat-conducting pipe is connected to the brine inlet pipe, and the tail end is connected to the brine outlet pipe.

[0010] Preferably, the bracket includes four parallel support columns, the top ends of which are fixedly connected to the bottom surface of the top mounting frame, and the lower ends of which are fixedly connected to the bottom mounting frame. An axial flow heat collection system is installed on the top mounting frame. A first lifting crossbar and a second lifting crossbar are vertically slidably connected between two opposing support columns and locked by a locking mechanism. The bottom of the first lifting crossbar and the second lifting crossbar are fixedly connected to the axial flow heat collection system.

[0011] Preferably, the bottom mounting frame is mounted on a dual-axis platform, which includes a pitch motor, a rotary motor, a pitch shaft, a rotary reducer, and a pitch reducer. The end of the rotary motor is connected to the rotary reducer to form a rotation mechanism in the horizontal plane, and the end of the pitch motor is connected to the pitch reducer to form a pitch mechanism in the vertical plane. The pitch mechanism is connected to the output end of the rotary mechanism, together forming a two-way rotation and pitch mechanism. The pitch shaft is fixedly connected to the output end of the pitch reducer and is fixedly connected to the bottom of the bracket. A light-tracking sensor is installed on the Fresnel mirror heat collection system.

[0012] Preferably, the bottom of the dual-axis platform is fixedly connected to a column, and the bottom of the column is fixedly installed on the ground.

[0013] Preferably, the Fresnel mirror heat collection system includes multiple linear Fresnel mirrors, with an inner support frame between the multiple Fresnel mirrors to form a Fresnel mirror array. An outer support frame is provided around the Fresnel mirrors, and the Fresnel mirror fixing frame formed by the inner and outer support frames is installed on the top surface of the support.

[0014] A method for using an axial-flow Fresnel mirror concentrated brine crystallization salt system is as follows: A pressure pump forces concentrated brine into the heat-conducting tubes of a steam heat exchanger from the brine inlet. After being heated to 60℃-80℃, the brine enters the brine interface of the axial-flow heat collector system from the brine outlet of the steam heat exchanger. Then, under the conveying action of a dynamic slip ring, the brine enters the solid-liquid-gas separation tube through its inlet and flows out through the orifice of the solid-liquid-gas separation tube into the sealed cavity formed by the solid-liquid-gas separation tube and the heat collector tube. At this time, the dynamic slip ring drives the solid-liquid-gas separation tube... The forward rotation stirs the concentrated brine, ensuring it is heated evenly to 85℃-160℃, promoting evaporation and crystallization. Once it reaches 100℃, the evaporated steam is transported from the spiral gap of the spiral salt scraper to the steam outlet of the heat collector tube and then discharged to the steam inlet of the heat exchanger, heating the salt solution and condensing the steam. After a period of time, the power slip ring drives the solid-liquid-gas separation tube to rotate in the reverse direction, opening the crystallization interface. Under the scraping action of the spiral salt scraper, the crystallized salt inside the heat collector tube is transported to the crystallization interface of the heat collector tube and discharged.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention focuses natural light using a Fresnel mirror heat collection system, and utilizes the light energy to heat an axial flow heat collection system to crystallize concentrated brine. This achieves low-energy-consumption concentrated brine crystallization. The axial flow heat collection system heats the liquid concentrated brine, converting it into gaseous steam and solid crystalline salt, achieving efficient separation from liquid to gaseous and solid states. A steam heat exchanger is connected to the axial flow heat collection system, using the steam generated by the system for heating, thus achieving energy recovery and utilization. This solves the problems of long processing time, low efficiency, and high power consumption in existing concentrated brine treatment methods. Attached Figure Description

[0016] Figure 1 A schematic diagram of a concentrated brine crystallization system using an axial-flow Fresnel mirror. Figure 2 A structural side view of an axial-flow Fresnel mirror concentrated brine crystallization salt system; Figure 3 This is a schematic diagram of a Fresnel mirror heat collection system. Figure 4 This is a schematic diagram of the structure of an axial flow heat collection system; Figure 5 This is a schematic diagram of the solid-liquid-gas separation pipe. Figure 6 This is a schematic diagram of a steam-cooled heat exchanger. Figure 7 This is a schematic diagram illustrating the heat collection principle of a Fresnel mirror. Figure 8 This is a schematic diagram illustrating the heat collection and adjustment principle of a Fresnel mirror. Figure label: 1. Fresnel mirror heat collection system; 2. Axial flow heat collection system; 3. Support frame; 4. Dual-axis platform; 5. Column; 6. Steam heat exchanger. 1-1. Linear Fresnel lens; 1-2. Inner frame; 1-3. Outer frame; 2-1. Solid-liquid-gas separation pipe; 2-2. Power slip ring; 2-3. Steam interface; 2-4. Heat collection tube; 2-5. Crystallization interface; 2-6. Concentrated brine inlet; 2-101. Shaft collar; 2-102. Shaft shoulder; 2-103. Spiral salt scraper; 2-104. Hole; 2-105. Shaft sleeve; 2-106. Brine inlet. 3-101, Support column one; 3-102, Support column two; 3-103, Support column three; 3-104, Support column four; 3-105, First lifting crossbar; 3-106, Second lifting crossbar; 3-107, Bottom front crossbeam; 3-108, Bottom rear crossbeam; 3-109, Bottom right longitudinal beam; 3-110, Bottom left longitudinal beam; 4-1. Pitch motor; 4-2. Rotary motor; 4-3. Pitch shaft; 4-4. Rotary reducer; 4-5. Pitch reducer; 5-1. Connecting flange; 5-2. Column; 5-3. Fixed flange; 6-1. Brine inlet; 6-2. Distilled water outlet; 6-3. Brine outlet; 6-4. Steam inlet; 6-5. Heat pipe. Detailed Implementation

[0017] The present invention will be further explained and described below with reference to the accompanying drawings to enable those skilled in the art to better understand it.

[0018] Example 1 like Figure 1-8 As shown, an axial-flow Fresnel mirror concentrated brine crystallization system includes a Fresnel mirror heat collection system 1, an axial-flow heat collection system 2, a support 3, a dual-axis platform 4, a column 5, and a steam heat exchanger 6. The support 3 is installed below the Fresnel mirror heat collection system 1, and the axial-flow heat collection system 2 is installed on the support. The axial-flow heat collection system 2 is located directly below the Fresnel mirror heat collection system 1. The light focused by the Fresnel mirror heat collection system 1 can irradiate the axial-flow heat collection system 2 for heating. The axial-flow heat collection system 2 has an inner cavity for containing concentrated brine and a steam outlet 2-3, a crystallization interface 2-5, and a concentrated brine inlet 2-6 connected to the inner cavity. By focusing natural light through the Fresnel mirror heat collection system 1, the concentrated brine is heated and crystallized using light energy to achieve low-energy-consumption concentrated brine crystallization, solving the problems of long processing time, low efficiency, and high power consumption in existing concentrated brine treatment methods.

[0019] The aforementioned Fresnel mirror heat collection system 1 includes multiple linear Fresnel mirrors 1-1. The linear Fresnel mirrors 1-1 can be made of materials such as acrylic or glass. To prevent deformation of the Fresnel mirrors 1-1 at high temperatures, inner supports 1-2 are installed between the multiple Fresnel mirrors 1-1, forming a Fresnel mirror array. A rectangular outer support 1-3 is installed around the periphery of the Fresnel mirror heat collection system 1 to reinforce the Fresnel mirror array. The frame-shaped Fresnel mirror fixing bracket formed by fixing the inner supports 1-2 and the outer supports 1-3 is installed on the top surface of the support 3. The inner supports 1-2 are horizontal H-shaped, and the outer supports 1-3 are U-shaped. This structure can embed the linear Fresnel mirrors for limiting and fixing. The inner supports 1-2 and the outer supports 1-3 can be made of metal, and their depth and width should be designed according to the dimensions of the linear Fresnel mirrors 1-1. The Fresnel mirror heat collection system 1 includes one or more linear Fresnel mirrors 1-1, inner support 1-2, and outer support 1-3. The combination of inner support 1-2 and outer support 1-3 can simultaneously integrate a linear Fresnel mirror array, reducing the manufacturing cost of large Fresnel mirrors and increasing the system's heat-receiving area.

[0020] The axial flow heat collection system 2 includes a solid-liquid-gas separation pipe 2-1 and a heat collection pipe 2-4. The solid-liquid-gas separation pipe 2-1 is installed inside the heat collection pipe 2-4. The head end of the solid-liquid-gas separation pipe 2-1 extends out of the heat collection pipe 2-4 and is fixedly connected to one end of a power slip ring 2-2. The other end of the power slip ring 2-2 is connected to a concentrated brine inlet 2-6. The concentrated brine automatically enters the solid-liquid-gas separation pipe 2-1 from the other end of the power slip ring 2-2. A steam interface 2-3 is opened on the side wall of the heat collection pipe 2-4 near the head end, and a crystallization interface 2-5 is opened below. A through hole 2-104 is provided on the solid-liquid-gas separation pipe 2-1 near the inner end, which connects to the heat collection pipe 2-4. The concentrated brine flows into the heat collection pipe 2-4 through the through hole. The concentrated brine is heated inside the heat collection pipe 2-4 to generate steam and crystallized salt. The steam is discharged from the steam interface 2-3, and the crystallized salt is discharged from the crystallization interface 2-5, realizing the separation of liquid brine into gaseous steam and solid crystallized salt.

[0021] The solid-liquid-gas separator 2-1 is a hollow tubular structure. Its head end is open to a brine inlet 2-106 connected to a power slip ring 2-2. The power slip ring 2-2 is connected to the brine inlet 2-106 and can drive the solid-liquid-gas separator 2-1 to rotate. A collar 2-101 is located near the inner end of the brine inlet 2-106. The collar 2-101 is sealed to the solid-liquid-gas separator 2-1 by a sealing ring. A shoulder 2-102 is provided on one side of the inner end of the tube 2-1. A bushing 2-105 is provided at the end of the solid-liquid-gas separation tube 2-1 to seal it. A sealing sleeve is provided between the bushing 2-105 and the solid-liquid-gas separation tube 2-1. A spiral salt scraper 2-103 is provided between the bushing 2-105 and the shoulder 2-102. Support bearings are fixedly connected to the collar 2-101 and the bushing 2-105 respectively. The solid-liquid-gas separation tube 2-1 is rotatably connected to the heat collection tube 2-4 through the support bearing 2. After passing through the power slip ring 2-2, the concentrated brine enters the solid-liquid-gas separation tube 2-1 through the brine inlet 2-106, and then flows out through the hole 2-104 into the closed cavity formed by the solid-liquid-gas separation tube 2-1 and the heat collection tube 2-4. When the heat collection tube 2-4 is heated, it heats the concentrated brine. At this time, the power slip ring 2-2 drives the solid-liquid-gas separation tube 2-1 to rotate in the forward direction, stirring the concentrated brine and making it evenly heated. The concentrated brine reaches 85℃-160℃, promoting the evaporation and crystallization process. The evaporated steam is transported from the spiral gap of the spiral salt scraper 2-103 to the steam interface 2-3 of the heat collection tube 2-4 and discharged. After a period of time, the power slip ring 2-2 drives the solid-liquid-gas separation tube 2-1 to rotate in the reverse direction. Under the scraping action of the spiral salt scraper 2-103, the crystallized salt inside the heat collection tube 2-4 is transported to the crystallization interface 2-5 of the heat collection tube 2-4 and discharged. The axial flow heat collection system 2 is equipped with a power slip ring 2-2 structure, which can provide a concentrated brine delivery interface for the solid-liquid-gas separation pipe 2-1, and can also provide power for the rotation of the solid-liquid-gas separation pipe 2-1, realizing the integration of liquid delivery and power drive. The axial flow heat collection system 2 heats up the liquid concentrated brine and converts it into gaseous steam and solid crystalline salt, realizing efficient separation from liquid to gaseous and solid states.

[0022] The steam outlet 2-3 of the axial flow heat collection system 2 is connected to the steam inlet 6-4 of the steam heat exchanger 6. The steam heat exchanger 6 is mounted on the support 3 and has a cavity inside. The head end of the steam heat exchanger 6 is provided with a brine inlet 6-1, and the tail end of the steam heat exchanger 6 is provided with a brine outlet 6-3. The brine outlet 6-3 is connected to the concentrated brine inlet 2-6 of the axial flow heat collection system 2. The side wall of the steam heat exchanger 6 is provided with a distilled water outlet 6-2 near the head end and a steam inlet 6-4 near the tail end. The steam inlet 6-4 is connected to the steam interface 2-3 of the axial flow heat collection system 2. A heat-conducting pipe 6-5 is installed inside the steam heat exchanger 6. The head end of the heat-conducting pipe 6-5 is connected to the brine inlet 6-1 through a pipe, and the tail end is connected to the brine outlet 6-3 through a pipe. Low-temperature concentrated brine enters the steam heat exchanger 6 through the brine inlet 6-1. After being heated in the steam heat exchanger 6, it is discharged through the brine outlet 6-3 and transported to the concentrated brine inlet 2-6 of the axial flow heat collector system 2. The high-temperature steam discharged from the steam interface 2-3 of the axial flow heat collector system 2 is transported to the steam inlet 6-4 of the steam heat exchanger 6. Heat exchange and cooling occur inside the heat exchanger 6, and the steam is condensed to form distilled water, which is discharged through the distilled water outlet 6-2. The high-temperature steam of the axial flow heat collector system 2 is recovered and used to preheat the brine, effectively reducing the heating and evaporation time of the brine by the axial flow heat collector system 2, saving energy, improving efficiency, and solving the problems of long treatment time, low efficiency, and high power consumption in existing concentrated brine treatment systems.

[0023] The aforementioned bracket 3 includes four parallel support columns, namely support column one 3-101, support column two 3-102, support column three 3-103 and support column four 3-104. Each column is a profile with T-slots on four sides. The four support columns are respectively erected below the Fresnel mirror heat collection system 1 near the four corners. The lower ends of the four support columns are fixedly connected to the bottom mounting frame. The mounting frame is composed of multiple profiles with T-slots on four sides. The axial flow heat collection system 2 is installed on the top mounting frame 3-100. The first lifting crossbar 3-105 and the second lifting crossbar 3-106 are vertically slidably connected between the two opposing support columns and are locked by a locking mechanism. The bottom of the first lifting crossbar 3-105 and the second lifting crossbar 3-106 are fixedly connected to the axial flow heat collection system 2. The bottom mounting frame includes a bottom front crossbeam 3-107, a bottom rear crossbeam 3-108, a bottom left longitudinal beam 3-110, and a bottom right longitudinal beam 3-109. The bottom front crossbeam 3-107 and the bottom rear crossbeam 3-108 are fixedly connected by the bottom left longitudinal beam 3-110 and the bottom right longitudinal beam 3-109, which are arranged symmetrically. By controlling the raising and lowering of the first lifting crossbeam 3-105 and the second lifting crossbeam 3-106, the distance between the axial flow heat collection system 2 and the Fresnel mirror heat collection system 1 can be changed, thereby altering the heat-receiving area of ​​the heat collection tube 2-4 to meet different heat collection requirements.

[0024] The bottom mounting frame is installed on the dual-axis platform 4, which includes a pitch motor 4-1, a rotary motor 4-2, a pitch shaft 4-3, a rotary reducer 4-4, and a pitch reducer 4-5. The rotary motor 4-2 is connected to the rotary reducer 4-4 to form a horizontal rotation mechanism, and the pitch motor 4-1 is connected to the pitch reducer 4-5 to form a vertical pitch mechanism. The pitch mechanism is connected to the output end of the rotary mechanism, together forming a two-way mechanism of rotation and pitch. The pitch shaft 4-3 is connected to the output end of the pitch reducer 4-5, and the pitch shaft 4-3 is also connected to the bottom front crossbeam 3-107 and bottom rear crossbeam 3-108 of the bracket 3. Under the rotation and pitch motion of the two-way mechanism, the Fresnel mirror heat collection system 1, the axial flow heat collection system 2, and the bracket 3 are driven to achieve rotation and pitch motion.

[0025] A light-tracing sensor is installed on the Fresnel mirror heat collection system 1 to ensure that the Fresnel mirror 1-1 faces the sun, thereby ensuring the effective light-receiving area of ​​the heat collection system.

[0026] The bottom of the dual-axis platform 4 is fixedly connected to a column 5. The bottom of the column 5 is fixedly installed on the ground. Specifically, the column 5 includes a connecting flange 5-1, a column body 5-2, and a fixing flange 5-3. The top of the column body 5-2 is fixedly connected to the rotating mechanism at the bottom of the dual-axis platform 4 through the connecting flange. The bottom of the column body 5-2 is fixedly installed on the ground through the fixing flange 5-3. It has stable support performance and ensures that the bracket 3 and the dual-axis platform 4 can smoothly adjust the position of the axial flow heat collection system 2 and the Fresnel mirror heat collection system 1.

[0027] Example 2 A method for using an axial-flow Fresnel mirror concentrated brine crystallization salt system is as follows: A concentrated brine at 10℃-30℃ is pumped from the brine inlet 6-1 of the heat exchanger 6 into the heat-conducting tube 6-5 via a pressure pump. After heating to 60℃-80℃, the brine enters the brine inlet 2-6 of the power slip ring 2-2 from the brine outlet 6-3. Then, under the conveying action of the power slip ring 2-2, it enters the solid-liquid-gas separation tube 2-1 from the brine inlet 2-106, flowing out through the hole 2-104 into the sealed cavity formed by the solid-liquid-gas separation tube 2-1 and the heat collection tube 2-4. At this time, the power slip ring 2-2 drives the solid-liquid-gas separation tube 2-1 forward. The concentrated brine is stirred by rotation, ensuring it is heated evenly to 85℃-160℃, promoting evaporation and crystallization. Once it reaches 100℃, the evaporated steam is transported from the spiral gap of the spiral salt scraper 2-103 to the steam interface 2-3 of the heat collector tube 2-4 and discharged to the steam inlet 6-4 of the steam heat exchanger 6, heating the salt solution and condensing the steam. After a period of time, the power slip ring 2-2 drives the solid-liquid-gas separation tube 2-1 to rotate in the opposite direction. Under the scraping action of the spiral salt scraper 2-103, the crystallized salt inside the heat collector tube 2-4 is transported to the crystallization interface 2-5 of the heat collector tube 2-4 and discharged.

[0028] In the above process, a light-tracking sensor is used to control the rotation and pitch movements of a dual-axis platform to ensure that the Fresnel mirror 1-1 is facing the sun, thereby ensuring the effective light-receiving area of ​​the thermal collection system. Figure 7 As shown.

[0029] Meanwhile, in order to control the internal temperature of the heat collector tube within a set range, such as 85℃-160℃, the heating area of ​​the heat collector tube 2-4 is changed by adjusting the raising and lowering of the first lifting crossbar 3-105 and the second lifting crossbar 3-106. Figure 8 As shown, when the distance between Fresnel mirror 1-1 and heat collection tube 2-4 increases (e.g., L1), the heated area 2-7 decreases; when the distance between Fresnel mirror 1-1 and heat collection tube decreases (e.g., L2), the heated area 2-8 increases.

[0030] Through the above settings and operations, the present invention produces the following beneficial effects: 1) By focusing natural light through Fresnel mirror heat collection system 1, the concentrated brine is heated and crystallized by using light energy to heat axial flow heat collection system 2, thereby achieving zero-energy heat collection and concentrated brine crystallization. 2) The axial flow heat collection system 2 used in this invention heats up the liquid concentrated brine and converts it into gaseous steam and solid crystalline salt, thus achieving efficient separation from liquid to gaseous and solid states. 3) The axial flow heat collection system of the present invention is provided with a slip ring structure 2-2, which can provide a concentrated brine delivery interface 2-6 for the solid-liquid-gas separation pipe, and can also provide power for the rotation of the solid-liquid-gas separation pipe 2-1, realizing the integration of liquid delivery and power drive. 4) The Fresnel mirror heat collection system 1 of the present invention includes one or more linear Fresnel mirrors 1-1, inner support 1-2, and outer support 1-3. The linear Fresnel mirror array can be integrated simultaneously by combining the inner support 1-2 and the outer support 1-3, thereby reducing the manufacturing cost of the large Fresnel mirror 1-1 and increasing the heat-receiving area of ​​the system. 5) The axial flow heat collection system 2 of the present invention can be raised and lowered with the first lifting crossbar 3-105 and the second lifting crossbar 3-106 to change the heat receiving area of ​​the heat collection tube 2-4 in order to meet different heat collection needs.

[0031] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit and principles thereof should fall within the protection scope defined by the claims of the present invention.

Claims

1. An axial-flow Fresnel mirror concentrated brine crystallization salt system, characterized in that, The system includes a Fresnel mirror heat collection system (1) and an axial flow heat collection system (2). A bracket (3) is installed below the Fresnel mirror heat collection system (1), and the axial flow heat collection system (2) is installed on the bracket (3). The axial flow heat collection system (2) is located directly below the Fresnel mirror heat collection system (1), and the light focused by the Fresnel mirror heat collection system (1) can irradiate the axial flow heat collection system (2) for heating. The axial flow heat collection system (2) is provided with an inner cavity for containing concentrated brine and a steam outlet (2-3), a crystallization interface (2-5), and a concentrated brine inlet (2-6) connected to the inner cavity. The axial flow heat collection system (2) includes a solid-liquid-gas separation pipe (2-1) and a heat collection pipe (2-4). The solid-liquid-gas separation pipe (2-1) is installed inside the heat collection pipe (2-4). The head end of the solid-liquid-gas separation pipe (2-1) extends out of the heat collection pipe (2-4) and is fixedly connected to one end of a power slip ring (2-2). The other end of the power slip ring (2-2) is connected to a concentrated brine inlet (2-6). A steam outlet (2-3) is opened near the upper part of the head end of the heat collection pipe (2-4), and a crystallization interface (2-5) is opened below it. A through hole (2-104) is provided on the solid-liquid-gas separation pipe (2-1) near the inner end, which connects to the heat collection pipe (2-4). The solid-liquid-gas separation pipe (2-1) is a hollow tubular structure with a brine inlet (2-106) at the head end. The power slip ring (2-2) is connected to the brine inlet (2-106) and can drive the solid-liquid-gas separation pipe (2-4). 2-1) Rotation: A collar (2-101) is provided on the side of the brine inlet (2-106) near the inner end of the solid-liquid-gas separation tube (2-1). A shoulder (2-102) is provided on the side of the collar (2-101) near the inner end of the solid-liquid-gas separation tube (2-1). A bushing (2-105) is provided at the end of the solid-liquid-gas separation tube (2-1) for sealing. A spiral salt scraper (2-103) is provided between the bushing (2-105) and the shoulder (2-102). Support bearings are fixedly connected to both the collar (2-101) and the bushing (2-105). The solid-liquid-gas separation tube (2-1) is rotatably connected to the heat collection tube (2-4) through the support bearing. A power slip ring (2-2) drives the solid-liquid-gas separation tube (2-1) to rotate in the forward direction to stir the concentrated brine. A power slip ring (2-2) drives the solid-liquid-gas separation tube (2-1) to rotate in the reverse direction to discharge the crystallized salt.

2. The axial-flow Fresnel mirror concentrated brine crystallization salt system according to claim 1, characterized in that, Steam outlet (2-3) is connected to steam inlet (6-4) of steam heat exchanger (6). Steam heat exchanger (6) is mounted on bracket (3). Steam heat exchanger (6) is provided with brine inlet (6-1) and brine outlet (6-3). Brine outlet (6-3) is connected to concentrated brine inlet (2-6) of axial flow heat collection system (2).

3. The axial-flow Fresnel mirror concentrated brine crystallization salt system according to claim 2, characterized in that, The steam heat exchanger (6) has a cavity inside, a brine inlet (6-1) at the head end and a brine outlet (6-3) at the end. The brine outlet (6-3) is connected to the concentrated brine inlet (2-6) of the axial flow heat collection system (2). The side wall of the steam heat exchanger (6) has a distilled water outlet (6-2) near the head end and a steam inlet (6-4) near the end. The steam inlet (6-1) is connected to the steam interface (2-3) of the axial flow heat collection system (2). A heat-conducting pipe (6-5) is installed inside the steam heat exchanger (6). The head end of the heat-conducting pipe (6-5) is connected to the brine inlet (6-1) through a pipe, and the end end is connected to the brine outlet (6-3) through a pipe.

4. The axial-flow Fresnel mirror concentrated brine crystallization salt system according to claim 1, characterized in that, The bracket (3) includes four parallel support columns. The top ends of the four support columns are fixedly connected to the bottom surface of the top mounting frame (3-100), and the lower ends of the four support columns are fixedly connected to the bottom mounting frame. The axial flow heat collection system (2) is installed on the top mounting frame (3-100). A first lifting crossbar (3-105) and a second lifting crossbar (3-106) are vertically slidably connected between two opposing support columns and locked by a locking mechanism. The bottom of the first lifting crossbar (3-105) and the second lifting crossbar (3-106) are fixedly connected to the axial flow heat collection system (2).

5. The axial-flow Fresnel mirror concentrated brine crystallization salt system according to claim 4, characterized in that, The bottom mounting frame is installed on the dual-axis platform (4). The dual-axis platform (4) includes a pitch motor (4-1), a rotary motor (4-2), a pitch shaft (4-3), a rotary reducer (4-4), and a pitch reducer (4-5). The rotary motor (4-2) is connected to the rotary reducer (4-4) at its end to form a rotation mechanism in the horizontal plane. The pitch motor (4-1) is connected to the pitch reducer (4-5) at its end to form a pitch mechanism in the vertical plane. The pitch mechanism is connected to the output end of the rotary mechanism to form a two-way rotation and pitch mechanism. The pitch shaft (4-3) is fixedly connected to the output end of the pitch reducer (4-5). The pitch shaft (4-3) is fixedly connected to the bottom of the bracket (3). A light-tracking sensor is installed on the Fresnel mirror heat collection system (1).

6. The axial-flow Fresnel mirror concentrated brine crystallization salt system according to claim 5, characterized in that, The bottom of the dual-axis platform (4) is fixedly connected to a column (5), and the bottom of the column (5) is fixedly installed on the ground.

7. The axial-flow Fresnel mirror concentrated brine crystallization salt system according to claim 1, characterized in that, The Fresnel mirror heat collection system (1) includes multiple linear Fresnel mirrors (1-1), with an inner support (1-2) between the multiple Fresnel mirrors (1-1) to form a Fresnel mirror array. A square outer support (1-3) is provided around the Fresnel mirrors (1-1). The Fresnel mirror fixing frame formed by fixing the inner support (1-2) and the outer support (1-3) is installed on the top surface of the bracket (3).

8. The method of using the axial flow Fresnel mirror concentrated brine crystallization salt system according to any one of claims 1-7 is characterized in that, A pressure pump forces concentrated brine into the heat-conducting tube (6-5) of the steam heat exchanger (6) through the brine inlet (6-1). After being heated to 60℃-80℃, the brine enters the brine interface (2-6) of the axial flow heat collector system (2) through the brine outlet (6-3) of the steam heat exchanger (6). Then, under the conveying action of the power slip ring (2-2), the brine enters the solid-liquid-gas separator (2-1) through the brine inlet (2-106) and flows out from the through hole (2-104) of the solid-liquid-gas separator (2-1) into the sealed cavity formed by the solid-liquid-gas separator (2-1) and the heat collector tube (2-4). At this time, the power slip ring (2-2) drives the solid-liquid-gas separator (2-1). The concentrated brine is stirred in the forward rotation to ensure uniform heating. The concentrated brine reaches 85℃-160℃, promoting evaporation and crystallization. After reaching 100℃, the evaporated steam is transported from the spiral gap of the spiral scraper (2-103) to the steam outlet (2-3) of the heat collector tube (2-4) and discharged to the steam inlet (6-4) of the heat exchanger (6) to heat the salt solution and condense the steam. After a period of time, the power slip ring (2-2) drives the solid-liquid-gas separation tube (2-1) to rotate in the reverse direction. Under the scraping action of the spiral scraper (2-103), the crystallization interface (2-5) is opened, and the crystallized salt inside the heat collector tube (2-4) is transported to the crystallization interface (2-5) of the heat collector tube (2-4) and discharged.

Images