Axial flow type Fresnel lens strong brine salt crystallization system and use method thereof

Abstract

The invention discloses an axial flow type Fresnel lens strong brine crystallization salt system and a using method thereof.The system comprises a Fresnel lens heat collecting system and an axial flow heat collecting system, a support is installed below the Fresnel lens heat collecting system, and the axial flow heat collecting system is installed on the support; the axial flow heat collection system is located under the Fresnel lens heat collection system, light focused by the Fresnel lens heat collection system can be irradiated to the axial flow heat collection system for heating, and the axial flow heat collection system is provided with an inner cavity for containing strong brine, a steam outlet, a crystallization connector and a strong brine inlet, wherein the steam outlet, the crystallization connector and the strong brine inlet are communicated with the inner cavity. Zero-energy-consumption heat collection strong brine crystallization is achieved, and the problems that existing strong brine treatment is long in duration, low in efficiency and large in power consumption are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of concentrated brine crystallization treatment, and specifically relates to an axial-flow Fresnel mirror concentrated brine crystallization salt system, and also relates to a method for using the axial-flow Fresnel mirror concentrated brine crystallization salt system. Background Art

[0002] There is a large amount of saline water in saline-alkali areas, including groundwater, farmland drainage, etc. At the same time, the brine proposed by the salt precipitation method also has a large quantity. The utilization of these saline water resources will become an important water source to alleviate the contradiction between the supply and demand of fresh water in such areas. Existing saline water desalination technologies, such as thermal methods and membrane methods, will produce a large amount of concentrated brine. Usually, the method of using a solar salt field is adopted for treatment, and the brine is placed in a solar salt pond. The temperature of the brine is increased by sunlight to promote the evaporation of water, so as to realize the precipitation and aggregation of salt crystals. This process takes a long time and has low efficiency. Moreover, the heat conduction efficiency of the process of heating concentrated brine with steam in factories is low and the energy consumption is high.

[0003] Chinese Patent with Publication No. CN117509792B discloses a concentrated brine crystallization and salt separation and water collection device, including a concentrated brine storage tank, an evaporation tank, a main control cabinet, a refrigerator, a water collection tank and a base. The inner wall of the evaporation tank is provided with heating wires and is electrically connected to the main control cabinet: Among them, a condensation water collection component is arranged inside the water collection tank. The condensation water collection component and the inner wall of the water collection tank form a heat flow circuit and a cold flow circuit. The water collection tank is connected in series with the concentrated brine storage tank, the evaporation tank and the heat flow circuit through a steam pipeline to form a circuit. The water collection tank is connected in series with the refrigerator through a cooling pipeline to form a circuit. In this application, steam flows in the water collection tank through a steam inlet pipe and a steam outlet pipe. When flowing, it will sequentially pass through a confluence plate and a plurality of shunt plates, and flow alternately in the confluence plate and the shunt plates. When flowing, it will be cooled and condensed by the confluence plate and the shunt plates, thereby forming water droplets. The water droplets automatically drip and gather and then flow out through a drainage pipeline. Although this device can realize self-cooling and improve the condensation water collection effect, it requires evaporation operation of the evaporation tank. Steam flows in the water collection tank through a steam inlet pipe and a steam outlet pipe. When flowing, it sequentially passes through a confluence plate and a plurality of shunt plates, and is cooled and condensed by the confluence plate and the shunt plates when flowing. The whole process still has the problems of long duration, low efficiency and high energy consumption. Therefore, it is very urgent to study a concentrated brine crystallization system with low energy consumption and high efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide an axial-flow Fresnel mirror concentrated brine crystallization salt system and a method for using the same, so as to solve the problems of long duration, low efficiency and high power consumption in the disposal of existing concentrated brine.

[0005] The technical solution adopted by the present invention is an axial-flow Fresnel mirror concentrated brine crystallization salt system, which includes a Fresnel mirror heat collection system and an axial-flow heat collection system. A bracket is installed below the Fresnel mirror heat collection system, and the axial-flow heat collection system is installed on the bracket. The axial-flow heat collection system is 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 is provided with an inner cavity for accommodating concentrated brine, a steam outlet, a crystallization interface and a concentrated brine inlet that communicate with the inner cavity.

[0006] Preferably, the above-mentioned steam outlet is connected to the steam inlet of a steam heat exchanger. The steam heat exchanger is installed on the bracket. The steam heat exchanger is provided with a brine inlet and a brine outlet, and 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 tube and a heat collection tube. The solid-liquid-gas separation tube is installed inside the heat collection tube. The head end of the solid-liquid-gas separation tube is hermetically extended out of the heat collection tube and fixedly connected to one end of a power slip ring. The other end of the power slip ring is connected to the concentrated brine inlet. A steam outlet is opened above the head end of the heat collection tube, and a crystallization interface is opened below. A through hole communicating with the heat collection tube is provided near the inner end of the solid-liquid-gas separation tube.

[0008] Preferably, the above-mentioned solid-liquid-gas separation tube is a hollow tubular structure. The head end opening is a brine inlet. The power slip ring is connected to the brine inlet and can drive the solid-liquid-gas separation tube to rotate. An axial ring is provided on one side of the brine inlet near the inner end of the solid-liquid-gas separation tube. A shoulder is provided on one side of the axial ring near the inner end of the solid-liquid-gas separation tube. The end of the solid-liquid-gas separation tube is closed by a shaft sleeve. A spiral salt scraping plate is provided between the shaft sleeve and the shoulder. Support bearings are fixedly connected to both the axial ring and the shaft sleeve. The solid-liquid-gas separation tube is rotationally connected to the heat collection tube through the support bearings.

[0009] Preferably, the above-mentioned steam heat exchanger is provided with a cavity inside. The head end is provided with a brine inlet, and the end is provided with a brine outlet. The brine outlet is connected to the concentrated brine inlet of the axial-flow heat collection system. A distilled water outlet is provided on the side wall of the steam heat exchanger near the head end, and a steam inlet is provided near the end. The steam inlet is connected to the steam interface of the axial-flow heat collection system. Heat conduction tubes are installed inside the steam heat exchanger. The head end of the heat conduction tube is connected to the brine inlet pipe, and the end is connected to the brine outlet pipe.

[0010] Preferably, the above-mentioned bracket includes four support columns arranged in parallel. The tops of the four support columns are fixedly connected to the bottom surface of the top mounting frame, and the lower ends of the four support columns are fixedly connected to the bottom mounting frame. The axial-flow heat collection system is installed on the top mounting frame. A first lifting cross bar and a second lifting cross bar are vertically slidably connected between two relatively front and rear support columns and locked by a locking mechanism. The bottoms of the first lifting cross bar and the second lifting cross bar are fixedly connected to the axial-flow heat collection system.

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

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

[0013] Preferably, the above Fresnel mirror heat collection system includes a plurality of linear Fresnel mirrors. An inner support frame is arranged between the plurality of Fresnel mirrors to form a Fresnel mirror array. An outer support frame is arranged outside the Fresnel mirrors. The Fresnel mirror fixing frame formed by the inner support frame and the outer support frame is installed on the top surface of the bracket.

[0014] A method for using an axial-flow Fresnel mirror concentrated brine crystallization salt system is as follows: The concentrated brine is pressed into the heat conduction tube of the steam heat exchanger from the brine inlet of the steam heat exchanger through a pressure pump. The brine heated to 60°C - 80°C enters the brine interface of the axial-flow heat collection system from the brine outlet of the steam heat exchanger, and then enters the inside of the solid-liquid-gas separation tube through the brine inlet of the solid-liquid-gas separation tube under the conveying action of the power slip ring, and flows out from the holes of the solid-liquid-gas separation tube to the closed cavity formed by the solid-liquid-gas separation tube and the heat collection tube. At this time, the power slip ring drives the solid-liquid-gas separation tube to rotate forward to stir the concentrated brine, so that the concentrated brine is evenly heated. The concentrated brine reaches 85°C - 160°C, promoting the evaporation and crystallization process. After reaching 100°C, the evaporated steam is conveyed through the spiral gap of the spiral salt scraping plate to the steam outlet of the heat collection tube and discharged to the steam inlet of the heat exchanger to heat the salt solution and condense the steam. After a period of time, the power slip ring drives the solid-liquid-gas separation tube to rotate reversely, opens the crystallization interface, and under the scraping action of the spiral salt scraping plate, the crystalline salt inside the heat collection tube is conveyed to the crystallization interface of the heat collection tube and discharged.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention focuses natural light through the Fresnel mirror heat collection system, uses the light energy to heat the axial-flow heat collection system to heat and crystallize the concentrated brine, realizes low-energy-consumption heat collection and concentrated brine crystallization. The adopted axial-flow heat collection system heats up the liquid concentrated brine and converts it into gaseous steam and solid crystalline salt, realizing efficient separation from liquid to gas and solid. The steam heat exchanger is connected to the axial-flow heat collection system and uses the steam generated by the axial-flow heat collection system for heating to realize energy recovery and utilization, solving the problems of long treatment time, low efficiency, and high power consumption in the existing concentrated brine disposal. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of an axial-flow Fresnel mirror concentrated brine crystallization salt system; Figure 2 It is a side view of the structure of an axial-flow Fresnel mirror concentrated brine crystallization salt system; Figure 3 It is a schematic structural diagram of a Fresnel mirror heat collection system; Figure 4 It is a schematic structural diagram of an axial-flow heat collection system; Figure 5 It is a schematic structural diagram of a solid-liquid-gas separation pipe; Figure 6 It is a schematic structural diagram of a steam-cooled heat exchanger; Figure 7 It is a schematic diagram of the principle of Fresnel mirror heat collection; Figure 8 It is a schematic diagram of the principle of Fresnel mirror heat collection adjustment; Reference numerals: 1. Fresnel mirror heat collection system, 2. Axial-flow heat collection system, 3. Bracket, 4. Biaxial platform, 5. Column, 6. Steam heat exchanger; 1-1. Linear Fresnel mirror, 1-2. Inner holder, 1-3. Outer holder; 2-1. Solid-liquid-gas separation pipe, 2-2. Power slip ring, 2-3. Steam interface, 2-4. Heat collection pipe, 2-5. Crystallization interface, 2-6. Concentrated brine inlet; 2-101. Axial ring, 2-102. Axial shoulder, 2-103. Spiral salt scraping plate, 2-104. Hole, 2-105. Bush, 2-106. Brine inlet; 3-101. Support column 1, 3-102. Support column 2, 3-103. Support column 3, 3-104. Support column 4, 3-105. First lifting cross bar, 3-106. Second lifting cross bar, 3-107. Bottom front cross beam, 3-108. Bottom rear cross beam, 3-109. Bottom right longitudinal beam, 3-110. Bottom left longitudinal beam; 4-1. Pitch motor, 4-2. Rotation motor, 4-3. Pitch axis, 4-4. Rotation reducer, 4-5. Pitch reducer; 5-1. Connecting flange, 5-2. Column body, 5-3. Fixed flange; 6-1. Brine inlet, 6-2. Distilled water outlet, 6-3. Brine outlet, 6-4. Steam inlet, 6-5. Heat conduction pipe. Specific implementation mode

[0017] The following will further explain and illustrate the present invention in conjunction with the accompanying drawings of the specification, so as to be better understood by those skilled in the art.

[0018] Example 1 AsFigure 1-8 As shown in the figure, an axial-flow Fresnel mirror concentrated brine crystallization salt system includes a Fresnel mirror heat collection system 1, an axial-flow heat collection system 2, a bracket 3, a biaxial platform 4, a column 5, and a steam heat exchanger 6. The 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. 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 is provided with an inner cavity for accommodating concentrated brine and a steam outlet 2-3, a crystallization interface 2-5, and a concentrated brine inlet 2-6 that communicate with the inner cavity. By focusing natural light through the Fresnel mirror heat collection system 1 and using solar energy to heat the axial-flow heat collection system 2 to collect heat and raise the temperature of the concentrated brine for crystallization, low-energy consumption heat collection for concentrated brine crystallization is achieved, solving the problems of long treatment time, low efficiency, and high power consumption in the existing concentrated brine disposal.

[0019] The above-mentioned Fresnel mirror heat collection system 1 includes a plurality of linear Fresnel mirrors 1-1. The linear Fresnel mirrors 1-1 can be made of materials such as acrylic and glass. To avoid deformation of the Fresnel mirrors 1-1 at high temperatures, an inner support frame 1-2 is arranged between multiple Fresnel mirrors 1-1 to form a Fresnel mirror array. An outer support frame 1-3 in a square shape is arranged on the periphery of the Fresnel mirror heat collection system 1 to reinforce the Fresnel mirror array. The frame-shaped Fresnel mirror fixing frame formed after the inner support frame 1-2 and the outer support frame 1-3 are fixed is installed on the top surface of the bracket 3. The inner support frame 1-2 is in a horizontal H shape, and the outer support frame 1-3 is in a U shape. This structure can embed the linear Fresnel mirrors for limit fixation. The inner support frame 1-2 and the outer support frame 1-3 can be processed from metal materials, and their depth and width should be designed according to the size of the linear Fresnel mirrors 1-1. The Fresnel mirror heat collection system 1 includes one or more linear Fresnel mirrors 1-1, an inner support frame 1-2, and an outer support frame 1-3. Through the combination of the inner support frame 1-2 and the outer support frame 1-3, a linear Fresnel mirror array can be integrated simultaneously, reducing the manufacturing cost of large Fresnel mirrors and increasing the heat receiving area of the system.

[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 is hermetically extended out of the heat collection pipe 2-4 and fixedly connected to one end of the power slip ring 2-2. The other end of the power slip ring 2-2 is connected to the concentrated brine inlet 2-6. The concentrated brine enters the inside of 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 above the head end of the side wall of the heat collection pipe 2-4, and a crystallization interface 2-5 is opened below. A through hole 2-104 communicating with the heat collection pipe 2-4 is provided near the inner end of the solid-liquid-gas separation pipe 2-1. The concentrated brine flows into the heat collection pipe 2-4 through the through hole. The concentrated brine generates steam and crystal salts when heated inside the heat collection pipe 2-4. The steam is discharged from the steam interface 2-3, and the crystal salts are discharged from the crystallization interface 2-5, realizing the separation of liquid brine into gaseous steam and solid crystal salts.

[0021] The solid-liquid-gas separation tube 2-1 is a hollow tubular structure. The head end opening is a brine inlet 2-106 connected to the 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 separation tube 2-1 to rotate. On the side of the brine inlet 2-106 close to the inner end of the solid-liquid-gas separation tube 2-1, there is a collar 2-101. The collar 2-101 is sealed with the solid-liquid-gas separation tube 2-1 through a sealing ring. On the side of the collar 2-101 close to the inner end of the solid-liquid-gas separation tube 2-1, there is a shoulder 2-102. The end of the solid-liquid-gas separation tube 2-1 is closed by a bushing 2-105. There is a sealing sleeve between the bushing 2-105 and the solid-liquid-gas separation tube 2-1. There is a spiral salt scraping plate 2-103 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 rotationally connected to the heat collecting tube 2-4 through the support bearings 2. The concentrated brine enters the interior of the solid-liquid-gas separation tube 2-1 from the brine inlet 2-106 after passing through the power slip ring 2-2, and then flows out through the holes 2-104 into the closed cavity formed by the solid-liquid-gas separation tube 2-1 and the heat collecting tube 2-4. When the heat collecting tube 2-4 is heated, the concentrated brine is heated. At this time, the power slip ring 2-2 drives the solid-liquid-gas separation tube 2-1 to rotate forward to stir the concentrated brine, so that the concentrated brine is evenly heated. When the concentrated brine reaches 85°C - 160°C, the evaporation and crystallization processes are promoted. The evaporated steam is transported through the spiral gap of the spiral salt scraping plate 2-103 to the steam interface 2-3 of the heat collecting 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 scraping plate 2-103, the crystal salts inside the heat collecting tube 2-4 are transported to the crystal interface 2-5 of the heat collecting tube 2-4 and discharged. The power slip ring 2-2 structure provided by the axial flow heat collecting system 2 can provide a concentrated brine transportation interface for the solid-liquid-gas separation tube 2-1 and can also provide power for the rotation of the solid-liquid-gas separation tube 2-1, realizing the integration of liquid transportation and power drive. The axial flow heat collecting system 2 heats up the liquid concentrated brine and converts it into gaseous steam and solid crystal salts, realizing the efficient separation from liquid to gas and solid.

[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 installed on the bracket 3. A cavity is provided inside the steam heat exchanger 6. A brine inlet 6-1 is provided at the head end of the steam heat exchanger 6, and a brine outlet 6-3 is provided at the end of the steam heat exchanger 6. The brine outlet 6-3 is connected to the concentrated brine inlet 2-6 of the axial flow heat collection system 2. A distilled water outlet 6-2 is provided on the side wall of the steam heat exchanger 6 near the head end, and a steam inlet 6-4 is provided near the end. The steam inlet 6-4 is connected to the steam interface 2-3 of the axial flow heat collection system 2. A heat conduction tube 6-5 is installed inside the steam heat exchanger 6. The head end of the heat conduction tube 6-5 is connected to the brine inlet 6-1 through a pipeline, and the end is connected to the brine outlet 6-3 through a pipeline. The low-temperature concentrated brine enters the steam heat exchanger 6 from the brine inlet 6-1, is heated up in the steam heat exchanger 6, and then is discharged through the brine outlet 6-3 and transported to the concentrated brine inlet 2-6 of the axial flow heat collection system 2; the high-temperature steam discharged from the steam interface 2-3 of the axial flow heat collection system 2 is transported to the steam inlet 6-4 of the steam heat exchanger 6, undergoes heat exchange and cooling condensation in the heat exchanger 6 to form distilled water, and is discharged through the distilled water outlet 6-2. The high-temperature steam of the axial flow heat collection system 2 is recovered for preheating the brine, effectively reducing the heating and evaporation time of the brine by the axial flow heat collection system 2, saving energy and improving efficiency, and solving the problems of long treatment time, low efficiency and high power consumption in the existing concentrated brine disposal.

[0023] The above-mentioned bracket 3 includes four support columns arranged in parallel, namely support column one 3-101, support column two 3-102, support column three 3-103 and support column four 3-104. Each is a profile with T-shaped grooves on four sides. The four support columns are respectively erected near the four corners under the Fresnel mirror heat collection system 1. 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-shaped grooves on four sides. 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 the two relatively front and rear 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. 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 through the bottom left longitudinal beam 3-110 and the bottom right longitudinal beam 3-109 arranged symmetrically on the left and right. By controlling the lifting of the first lifting crossbar 3-105 and the second lifting crossbar 3-106, the distance between the axial flow heat collection system 2 and the Fresnel mirror heat collection system 1 can be changed, and the heat receiving area of the heat collection tube 2-4 can be changed to meet different heat collection requirements.

[0024] The bottom mounting frame is mounted on the dual-axis platform 4, which includes a pitching motor 4-1, a rotating motor 4-2, a pitching shaft 4-3, a rotating speed reducer 4-4, and a pitching speed reducer 4-5. The end of the rotating motor 4-2 is connected to the rotating speed reducer 4-4 to form a rotating mechanism in the horizontal plane. The end of the pitching motor 4-1 is connected to the pitching speed reducer 4-5 to form a pitching mechanism in the vertical plane. The pitching mechanism is connected to the output end of the rotating mechanism to jointly form a two-way mechanism for rotation and pitching. The pitching shaft 4-3 is connected to the output end of the pitching speed reducer 4-5, and the pitching shaft 4-3 is also connected to the bottom front cross beam 3-107 and the bottom rear cross beam 3-108 of the bracket 3. Under the rotation and pitching movements 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 pitching movements.

[0025] A light chasing sensor is installed on the Fresnel mirror heat collection system 1 to ensure that the Fresnel mirror 1-1 faces the sun directly, so as to ensure the effective light receiving area of the heat collection system.

[0026] A column 5 is fixedly connected to the bottom end of the dual-axis platform 4, and the bottom end 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 end of the column body 5-2 is fixedly connected to the rotating mechanism at the bottom end of the dual-axis platform 4 through the connecting flange, and the bottom end of the column body 5-2 is fixedly installed on the ground through the fixing flange 5-3, having stable support performance to ensure the smooth adjustment of the positions of the bracket 3 and the dual-axis platform 4 for the axial flow heat collection system 2 and the Fresnel mirror heat collection system 1.

[0027] Embodiment 2 A method for using an axial flow Fresnel mirror concentrated brine crystallization salt system, which is as follows: The concentrated brine at 10°C - 30°C is pressed into the heat conduction tube 6-5 from the brine inlet 6-1 of the heat exchanger 6 through a pressure pump. The brine heated to 60°C - 80°C enters the brine inlet 2-6 of the power slip ring 2-2 from the brine outlet 6-3, and then enters the inside of the solid-liquid-gas separation tube 2-1 from the brine inlet 2-106 under the conveying action of the power slip ring 2-2, and flows out from the hole 2-104 to 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 to rotate forward to stir the concentrated brine, so that the concentrated brine is evenly heated. The concentrated brine reaches 85°C - 160°C to promote the evaporation and crystallization process. After reaching 100°C, the evaporated steam is conveyed through the spiral gap of the spiral salt scraping plate 2-103 to the steam interface 2-3 of the heat collection tube 2-4 and discharged to the steam inlet 6-4 of the steam 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 backward, and under the scraping action of the spiral salt scraping plate 2-103, the crystal salt inside the heat collection tube 2-4 is conveyed to the crystal interface 2-5 of the heat collection tube 2-4 and discharged.

[0028] In the above process, by using a light-tracking sensor and controlling the rotation and pitching motions of a two-axis platform, the Fresnel mirror 1-1 is ensured to face the sun directly, so as to ensure the effective light-receiving area of the heat collection system, as Figure 7 shown.

[0029] Meanwhile, in order to control the internal temperature of the heat collection pipe within a set range, such as 85°C - 160°C, by adjusting the lifting of the first lifting crossbar 3-105 and the second lifting crossbar 3-106, the heat-receiving area of the heat collection pipe 2-4 is changed, as Figure 8 shown. When the distance between the Fresnel mirror 1-1 and the heat collection pipe 2-4 becomes larger (such as L1), the heat-receiving area 2-7 decreases; when the distance between the Fresnel mirror 1-1 and the heat collection pipe becomes smaller (such as L2), the heat-receiving area 2-8 increases.

[0030] Through the above settings and operations, the present invention has the following beneficial effects: 1) The natural light is focused by the Fresnel mirror heat collection system 1, and the light energy is used to heat the axial-flow heat collection system 2 to heat and crystallize the concentrated brine, realizing zero-energy consumption heat collection and crystallization of the concentrated brine; 2) The axial-flow heat collection system 2 adopted in the present invention heats and raises the temperature of the liquid concentrated brine, and converts it into gaseous steam and solid crystalline salt, realizing efficient separation from liquid to gas and solid; 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 conveying 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 transportation and power drive; 4) The Fresnel mirror heat collection system 1 of the present invention includes one or more linear Fresnel mirrors 1-1, an inner holder 1-2, and an outer holder 1-3. Through the combination of the inner holder 1-2 and the outer holder 1-3, a linear Fresnel mirror array can be integrated simultaneously, 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 lifted and lowered along with the first lifting crossbar 3-105 and the second lifting crossbar 3-106, changing the heat-receiving area of the heat collection pipe 2-4 to meet different heat collection requirements.

[0031] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit and principles of the present invention, various deformations and improvements made by those skilled in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An axial flow Fresnel mirror concentrated brine crystallization salt system, characterized in that: The invention comprises a Fresnel mirror heat collection system (1) and an axial flow heat collection system (2), wherein 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 be irradiated to the axial flow heat collection system (2) for heating; the axial flow heat collection system (2) is provided with an inner cavity for accommodating concentrated brine, a steam outlet (2-3) connected to the inner cavity, a crystallization interface (2-5), and a concentrated brine inlet (2-6).

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

3. The axial flow Fresnel mirror concentrated brine crystallization salt system according to claim 1, characterized in that: The axial flow heat collection system (2) comprises a solid-liquid-gas separation tube (2-1) and a heat collection tube (2-4); the solid-liquid-gas separation tube (2-1) is installed inside the heat collection tube (2-4); the head end of the solid-liquid-gas separation tube (2-1) is sealed and extends out of the heat collection tube (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 provided above the head end of the heat collection tube (2-4), and a crystallization interface (2-5) is provided below; and a through hole (2-104) communicating with the heat collection tube (2-4) is provided near the inner end of the solid-liquid-gas separation tube (2-1).

4. The axial flow Fresnel mirror concentrated brine crystallization salt system according to claim 3, characterized in that: The solid-liquid-gas separation tube (2-1) is a hollow tubular structure, the head end opening is a salt water inlet (2-106), the power slip ring (2-2) is connected to the salt water inlet (2-106) and can drive the solid-liquid-gas separation tube (2-1) to rotate, a shaft ring (2-101) is provided on the side of the salt water inlet (2-106) close to the inner end of the solid-liquid-gas separation tube (2-1), a shaft shoulder (2-102) is provided on the side of the shaft ring (2-101) close to the inner end of the solid-liquid-gas separation tube (2-1), a shaft sleeve (2-105) is provided at the end of the solid-liquid-gas separation tube (2-1) for sealing, a spiral salt scraping plate (2-103) is provided between the shaft sleeve (2-105) and the shaft shoulder (2-102), support bearings are fixedly connected to the shaft ring (2-101) and the shaft sleeve (2-105), and the solid-liquid-gas separation tube (2-1) is rotatably connected to the heat collecting tube (2-4) via the support bearing.

5. 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 therein, a brine inlet (6-1) is provided at the head end, and a brine outlet (6-3) is provided at the tail end, the brine outlet (6-3) is connected to the concentrated brine inlet (2-6) of the axial flow heat collection system (2), a distilled water outlet (6-2) is provided on the side wall of the steam heat exchanger (6) near the head end, a steam inlet (6-4) is provided near the tail end, the steam inlet (6-1) is connected to the steam interface (2-3) of the axial flow heat collection system (2), a heat conduction pipe (6-5) is installed inside the steam heat exchanger (6), the head end of the heat conduction pipe (6-5) is connected to the brine inlet (6-1) via a pipe, and the tail end is connected to the brine outlet (6-3) via a pipe.

6. The axial flow Fresnel mirror concentrated brine crystallization salt system according to claim 1, characterized in that: The bracket (3) comprises four support columns arranged in parallel, the top ends of the four support columns are fixedly connected to the bottom surface of the top mounting frame (3-100), the bottom ends of the four support columns are fixedly connected to the bottom mounting frame, the top mounting frame (3-100) is mounted with an axial flow heat collection system (2), a first lifting cross bar (3-105) and a second lifting cross bar (3-106) are vertically slidably connected between two front and rear opposing support columns and are locked by a locking mechanism, and the bottoms of the first lifting cross bar (3-105) and the second lifting cross bar (3-106) are fixedly connected to the axial flow heat collection system (2).

7. The axial flow Fresnel mirror concentrated brine crystallization salt system according to claim 6, characterized in that: The bottom mounting frame is mounted on a dual-axis platform (4); the dual-axis platform (4) comprises a pitch motor (4-1), a rotating motor (4-2), a pitch axis (4-3), a rotating reducer (4-4) and a pitch reducer (4-5); the end of the rotating motor (4-2) is connected to the rotating reducer (4-4) to form a rotating mechanism in a horizontal plane; the end of the pitch motor (4-1) is connected to the pitch reducer (4-5) to form a pitch mechanism in a vertical plane; the pitch mechanism is connected to the output end of the rotating mechanism to form a rotating and pitching bidirectional mechanism; the pitch axis (4-3) is fixedly connected to the output end of the pitch reducer (4-5); the pitch axis (4-3) is fixedly connected to the bottom of the bracket (3); and a light-chasing sensor is mounted on the Fresnel mirror heat collection system (1).

8. The axial flow Fresnel mirror concentrated brine crystallization salt system according to claim 7, characterized in that: The bottom end of the dual-axis platform (4) is fixedly connected to a column (5), and the bottom end of the column (5) is fixedly mounted on the ground.

9. The axial flow Fresnel mirror concentrated brine crystallization salt system according to claim 1, characterized in that: The Fresnel mirror heat collection system (1) comprises a plurality of linear Fresnel mirrors (1-1), an inner support frame (1-2) is arranged between the plurality of Fresnel mirrors (1-1) to form a Fresnel mirror array, a square frame-shaped outer support frame (1-3) is arranged outside the Fresnel mirrors (1-1), and a Fresnel mirror fixing frame formed by fixing the inner support frame (1-2) and the outer support frame (1-3) is installed on the top surface of the support frame (3).

10. The method for using the axial flow Fresnel mirror concentrated brine crystallization salt system according to any one of claims 1 to 9 is characterized in that: The concentrated brine is pressed into the heat transfer pipe (6-5) of the steam heat exchanger (6) from the brine inlet (6-1) of the steam heat exchanger (6) by a pressure pump. After the temperature rises to 60°C-80°C, the brine enters the brine interface (2-6) of the axial flow heat collection system (2) from the brine outlet (6-3) of the steam heat exchanger (6). Then, under the transportation action of the power slip ring (2-2), the brine enters the interior of the solid-liquid-gas separation tube (2-1) from the brine inlet (2-106) of the solid-liquid-gas separation tube (2-1) and flows out from the hole (2-104) of the solid-liquid-gas separation tube (2-1) to the closed 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) to flow out from the hole (2-104) of the solid-liquid-gas separation tube (2-1) to the closed cavity formed by the solid-liquid-gas separation tube (2-1) and the heat collection tube (2-4). The concentrated brine is stirred by forward rotation so that the concentrated brine is evenly heated. The concentrated brine reaches 85°C-160°C, which promotes the evaporation and crystallization process. After reaching 100°C, the evaporated steam is transported from the spiral gap of the spiral salt scraper (2-103) to the steam outlet (2-3) of the heat collecting tube (2-4) and discharged to the steam inlet (6-4) of the heat exchanger (6), thereby 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 reverse direction. Under the scraping action of the spiral salt scraper (2-103), the crystallization interface (2-5) is opened, and the crystallized salt inside the heat collecting tube (2-4) is transported to the crystallization interface (2-5) of the heat collecting tube (2-4) and discharged.

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