Evaporation system

Abstract

The invention discloses an evaporation system. The evaporation system comprises a crystallization chamber, the feeding channel is used for introducing materials into the crystallization chamber; one end of the first heating chamber is communicated with the crystallization chamber; one end of the second heating chamber is communicated with the crystallization chamber; the forced circulation pump, the crystallization chamber, the first heating chamber, the forced circulation pump and the second heating chamber are communicated with one another to form a circulation flow channel, the feeding channel is communicated with the circulation flow channel and used for introducing materials into the circulation flow channel, the forced circulation pump comprises a liquid inlet pipeline and a liquid outlet pipeline, the liquid inlet pipeline is communicated with the first heating chamber, and the liquid outlet pipeline is communicated with the second heating chamber. Materials sequentially flow through the second heating chamber, the crystallization chamber, the first heating chamber, the liquid inlet pipeline and the liquid outlet pipeline from the liquid outlet pipeline in the circulating direction. According to the invention, materials can be efficiently concentrated, the evaporation efficiency is relatively high, and the total load needing to be heated can be reduced under a certain evaporation load rated quantity, so that the energy consumption is reduced, and the equipment operation cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of evaporation, and in particular to an evaporation system. Background Art

[0002] In the chemical, pharmaceutical, food, light industry and other industries, there is a large demand for wastewater treatment. In the process of treating wastewater, it is usually necessary to extract inorganic matter in the wastewater and increase the concentration multiple of the solution.

[0003] The circulating evaporator is a device that circulates and evaporates the solution to concentrate and crystallize it. Specifically, after the solution is heated to a certain temperature, the water is separated by boiling and evaporating the material, and then the solution is refluxed by a circulating pump to achieve multiple evaporation and concentration, thereby obtaining a solution with a higher concentration. This process can not only effectively save energy, but also realize the recycling of resources.

[0004] In the prior art, the circulating evaporator has the problems of small evaporation load rating, low evaporation efficiency and high operating cost under a certain evaporation load rating. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the evaporation load rating is small, the evaporation efficiency is low and the operating cost is high under a certain evaporation load rating. The present invention provides an evaporation system with a high evaporation load rating, which can efficiently concentrate the material and have a high evaporation efficiency. Under a certain evaporation load rating, the total load required for heating can be reduced, thereby reducing energy consumption and reducing the cost of equipment operation.

[0006] In order to solve the above technical problems, an embodiment of the present invention discloses an evaporation system, comprising:

[0007] Feed channel;

[0008] Crystallization chamber;

[0009] a first heating chamber, one end of which is in communication with the crystallization chamber;

[0010] a second heating chamber, one end of which is in communication with the crystallization chamber;

[0011] A forced circulation pump, the crystallization chamber, the first heating chamber, the forced circulation pump and the second heating chamber are interconnected to form a circulation channel, the feed channel is connected to the circulation channel, and is used to pass the material into the circulation channel, the forced circulation pump includes an inlet pipe and an outlet pipe, the inlet pipe is connected to the first heating chamber, and the outlet pipe is connected to the second heating chamber, and is used to make the material flow from the outlet pipe in the circulation direction through the second heating chamber, the crystallization chamber, the first heating chamber, the inlet pipe, and the outlet pipe in sequence.

[0012] By adopting the above technical solution, the crystallization chamber, the first heating chamber, the forced circulation pump and the second heating chamber are interconnected to form a circulation channel. The material that needs to be evaporated (such as industrial wastewater) can enter the circulation channel through the feed channel. When the evaporation system is running, the forced circulation pump can make the material flow from the liquid outlet pipe in the circulation direction through the second heating chamber, the crystallization chamber, the first heating chamber, the liquid inlet pipe, and the liquid outlet pipe in sequence. In this way, by reducing the mass of the forced circulation pump flow rate, the power of the forced circulation pump can be reduced, achieving energy-saving and consumption-reducing effects and reducing the operating costs of the equipment. According to the flow calculation formula of the forced circulation pump: Among them, Q is the evaporation load, c is the specific heat capacity (generally a constant), m is the mass of the circulation pump flow, and Δt is the temperature difference before and after the material passes through the heating chamber. Therefore, it can be seen from the formula that when the system evaporation load Q is a constant (that is, under a certain evaporation load rating), in the design of double heating chambers, the material is heated twice, which can increase the temperature difference before and after passing through the heating chamber to reduce the mass m of the flow of the forced circulation pump, thereby reducing the power of the forced circulation pump and achieving energy saving and consumption reduction effects.

[0013] On the other hand, through the design of the double heating chamber of the first heating chamber and the second heating chamber, compared with the single heating chamber and other schemes, on the one hand, according to the formula: Q=SKΔt, wherein S is the heating area, Q is the evaporation load, K is a constant, Δt is the heat transfer temperature difference, and Δt is usually a fixed value. Therefore, it can be seen from the formula that when the heating area increases, the evaporation load will increase. Therefore, compared with the single heating chamber and other schemes, when the size and structure of the heating chamber are consistent, the design of the double heating chamber can effectively increase the heating area of ​​the material, and the evaporation load rating of the double heating chamber design is higher.

[0014] According to another specific embodiment of the present invention, an evaporation system is disclosed, comprising:

[0015] A first pipeline, along the circulation direction, the first pipeline comprises a first liquid inlet and a first liquid outlet, the first liquid inlet is arranged in the crystallization chamber, the first liquid inlet has a first height in the crystallization chamber, and the first liquid outlet is connected to the first heating chamber;

[0016] A second pipeline, along the circulation direction, the second pipeline includes a second liquid inlet and a second liquid outlet, the second liquid outlet is arranged in the crystallization chamber, the second liquid inlet is connected to the second heating chamber, the second liquid outlet has a second height in the crystallization chamber, and the first height is greater than the second height.

[0017] With the above technical solution, the first liquid inlet has a first height in the crystallization chamber, the second liquid outlet has a second height in the crystallization chamber, the first height is greater than the second height, wherein the first height refers to the height of the first liquid inlet relative to the bottom of the crystallization chamber, and the second height refers to the height of the second outlet relative to the bottom of the crystallization chamber. The material circulates along the circulation direction in the evaporation system, and after passing through the first heating chamber and the second heating chamber in sequence and entering the crystallization chamber, the material has reached the temperature for precipitating crystals. At this time, the crystals precipitated from the material in the crystallization chamber sink to the bottom of the crystallization chamber, and a clear liquid is formed above the crystallization chamber. Since the first height is greater than the second height, the crystals precipitated from the heated material after entering the crystallization chamber will sink toward the bottom, that is, sink in the direction away from the first liquid inlet, thereby allowing as much clear liquid as possible to flow into the first liquid inlet for the next heating crystallization, and the cycle is repeated until the crystals in the material are completely precipitated. Since clear liquid is used in each circulation, compared with the situation where a mixed liquid with crystals is used in the circulation heating, it can prevent the fine crystals in the material from accumulating in other pipelines of the evaporation system (for example, enriching and growing on the rough pipe wall until the pipeline is blocked), causing pipeline blockage and corrosion. It can effectively improve the evaporation efficiency and avoid cavitation caused by insufficient flow of the forced circulation pump due to pipeline blockage.

[0018] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an evaporation system, wherein the inner wall of the first pipe is provided with a first anti-vortex baffle, and in the radial direction, the first anti-vortex baffle and the inner wall of the first pipe together define a first flow channel and a second flow channel, and / or, the inner wall of the second pipe is provided with a second anti-vortex baffle, and in the radial direction, the second anti-vortex baffle and the inner wall of the second pipe together define a third flow channel and a fourth flow channel.

[0019] By adopting the above technical solution, a first anti-vortex baffle is provided on the inner wall of the first pipe, and a second anti-vortex baffle is provided on the inner wall of the second pipe, which can break up the vortex generated when the material flows, thereby preventing the vortex from bringing the precipitated crystals into the heating chamber and causing blockage of the heating tube in the heating chamber.

[0020] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an evaporation system, wherein the first liquid outlet is arranged outside the crystallization chamber, the first anti-vortex baffle is arranged at the first liquid outlet, and the second anti-vortex baffle is arranged at the second liquid outlet.

[0021] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an evaporation system, wherein the projections of the first anti-vortex baffle and the second anti-vortex baffle in the axial direction are in a straight line shape or a cross shape.

[0022] According to another specific embodiment of the present invention, an evaporation system is disclosed, comprising:

[0023] A first reducer, along the circulation direction, comprises a first small-diameter end and a first large-diameter end, the first small-diameter end is communicated with the second heating chamber, and the first large-diameter end is communicated with the second liquid inlet.

[0024] By adopting the above technical solution, along the circulation direction, the first small diameter end is connected to the second heating chamber, and the first large diameter end is connected to the second liquid inlet. Combined with the law of fluid movement, it can be known that along the circulation direction, when the material flows from the second heating chamber through the first reducer and the second liquid inlet into the crystallization chamber, the material flows from the first small diameter end with a smaller cross-sectional area to the first large diameter end with a larger cross-sectional area, and the flow rate of the material decreases. In this way, the flow rate of the material in and out of the crystallization chamber can be lowered, thereby ensuring the sedimentation of the crystals precipitated from the material and the floating of the clear liquid.

[0025] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an evaporation system, comprising a connecting pipe, one end of the connecting pipe is connected to the liquid outlet pipe, and the other end is connected to the second heating chamber, the feed channel is connected to the connecting pipe, along a first direction, the feed channel is closer to the ground than the crystallization chamber, and the first direction is not parallel to the ground.

[0026] With the above technical solution, the feed channel is arranged on the side of the second heating chamber close to the ground. Before the evaporation system is operated, when the material is introduced through the feed channel, the material can be slowly introduced into the crystallization chamber along the first heating chamber and the second heating chamber. In addition, when the evaporation system is operated, the material can also be added to one end of the second heating chamber through the feed channel, so that the material is heated and initially crystallized in the second heating chamber before participating in the material circulation.

[0027] According to another specific embodiment of the present invention, an evaporation system is disclosed, comprising:

[0028] A second reducer, along the circulation direction, the second reducer comprises a second large diameter end and a second small diameter end, the second large diameter end is communicated with the first heating chamber, and the second small diameter end is communicated with the liquid inlet pipe; and / or,

[0029] A third reducer, along the circulation direction, the third reducer includes a third large diameter end and a third small diameter end, the third small diameter end is connected to the liquid outlet pipe, and the third large diameter end is connected to the second heating chamber, or, along the circulation direction, the third reducer includes a third large diameter end and a third small diameter end, the third large diameter end is connected to the liquid outlet pipe, and the third small diameter end is connected to the second heating chamber.

[0030] By adopting the above technical solution, along the circulation direction, the second large diameter end is connected to the first heating chamber, the second small diameter end is connected to the liquid inlet pipe, the third large diameter end is connected to the second heating chamber, and the third small diameter end is connected to the liquid outlet pipe. Combined with the law of fluid movement, it can be known that along the circulation direction, when the material flows from the first heating chamber into the liquid inlet pipe through the second reducer, that is, the material flows from the second large diameter end with a larger cross-sectional area to the second large diameter end with a smaller cross-sectional area, the flow rate of the material increases. Similarly, when the material flows from the liquid outlet pipe through the third reducer into the second heating chamber, the material flows from the third large diameter end with a larger cross-sectional area to the third small diameter end with a smaller cross-sectional area, and the flow rate of the material increases. In this way, the flow rate of the material can be increased when passing through the liquid inlet pipe and the liquid outlet pipe of the forced circulation pump, and the crystals that may be accumulated near the liquid outlet pipe will be washed away, avoiding problems such as cavitation caused by crystal accumulation.

[0031] According to another specific embodiment of the present invention, an embodiment of the present invention discloses an evaporation system, wherein the liquid inlet pipe and the liquid outlet pipe intersect, and the liquid inlet pipe extends along a first direction, and the first direction is not parallel to the ground.

[0032] By adopting the above technical solution, when the material flows from the first heating chamber and the liquid inlet pipe to the liquid outlet pipe along the circulation direction, the material flows downward from a high place. Under the action of the gravity of the material itself, the flow rate of the material when passing through the liquid inlet pipe and the liquid outlet pipe of the forced circulation pump can be further increased, and the crystals that may be accumulated near the liquid outlet pipe can be washed away, thereby avoiding problems such as cavitation caused by crystal accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A side view of an evaporation system provided by an embodiment of the present application is shown.

[0034] Figure 2 A schematic diagram of a crystallization chamber of an evaporation system provided in an embodiment of the present application is shown.

[0035] Figure 3 A schematic diagram of a first anti-vortex baffle and a second anti-vortex baffle of an evaporation system provided in an embodiment of the present application is shown.

[0036] Figure 4 A schematic diagram showing the axial projection of the first anti-vortex baffle and the second anti-vortex baffle of the evaporation system provided by the embodiment of the present application is formed into the shape of a “one”.

[0037] Figure 5 A schematic diagram showing the axial projection of the first anti-vortex baffle and the second anti-vortex baffle of the evaporation system provided by the embodiment of the present application into a "cross" shape is shown.

[0038] Figure 6 A schematic diagram showing that the second anti-vortex baffle of the evaporation system provided in an embodiment of the present application is in the shape of a right-angled trapezoid.

[0039] Figure 7 A schematic diagram of a forced circulation pump of an evaporation system provided in an embodiment of the present application is shown.

[0040] Figure 8 A top cross-sectional view of a first heating chamber or a second heating chamber of an evaporation system provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0041] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0042] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0043] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0045] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0046] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0047] The evaporation system provided in the embodiment of the present application can be widely used in various industries. For example, in sewage treatment plants, chemical plants, pharmaceutical plants and other places, the evaporation system can be used to treat various types of industrial wastewater. By using the evaporation system, enterprises can convert pollutants in wastewater into reusable resources, thereby achieving waste reduction and harmless treatment. In addition, the evaporation system can also be widely used in the production of various products in the food industry, such as concentrated fruit juice, soy sauce, salt, and dairy products. The evaporation system can be used to extract organic solvents and important chemicals, helping enterprises reduce production costs and improve process flow to improve product quality.

[0048] In some embodiments, see Figure 1 The embodiment of the present application provides an evaporation system, including a crystallization chamber 10, a feed channel 20, a first heating chamber 30, a forced circulation pump 40, and a second heating chamber 50, which are interconnected. The crystallization chamber 10, the first heating chamber 30, the forced circulation pump 40, the second heating chamber 50, and the crystallization chamber 10 are sequentially interconnected to form a circulation channel, and the circulation flow direction of the material in the circulation channel is as follows: Figure 1 As shown by the middle arrow a, the feed channel 20 is connected to the circulation channel for feeding the material into the circulation channel.

[0049] Exemplarily, the evaporation system includes a connecting pipe 21, one end of the connecting pipe 21 is connected to the forced circulation pump 40, and the other end is connected to the second heating chamber 50. The feed channel 20 is connected to the connecting pipe 21. Along the first direction X, the feed channel 21 is closer to the ground than the crystallization chamber 10 ( Figure 1 As shown by the middle dotted line b), the first direction X is not parallel to the ground. It can be understood that the first direction X can be perpendicular to the ground, or form an angle of 30°, 40°, 45°, 60°, 70.1°, 80°, etc. with the ground, which is not limited to the embodiments of the present application.

[0050] In addition, the embodiment of the present application does not limit the position of the feed channel 20. For example, the feed channel 20 can also be located away from the ground and directly connected to the crystallization chamber 10, or the feed channel 20 can also be connected to the first heating chamber 30.

[0051] In some embodiments, see Figure 1 The forced circulation pump 40 includes a liquid inlet pipe 41 and a liquid outlet pipe 42. The liquid inlet pipe 41 is connected to the first heating chamber 30, and the liquid outlet pipe 42 is connected to one end of the connecting pipe 21. The other end of the connecting pipe 21 is connected to the second heating chamber 50. The end of the second heating chamber 50 away from the ground is connected to the crystallization chamber 10, so as to make the material flow along the circulation direction ( Figure 1 The liquid (in the direction indicated by the arrow a) flows from the liquid outlet pipe 42 through the connecting pipe 21, the second heating chamber 50, the crystallization chamber 10, the first heating chamber 30, the liquid inlet pipe 41, and the liquid outlet pipe 42 in sequence. Before the evaporation system is operated, the material is introduced through the feed channel 20, so that the material can slowly pass through the first heating chamber 30 and the second heating chamber 50 into the crystallization chamber 10. In addition, when the evaporation system is in operation, the material can also be supplemented to one end of the second heating chamber 50 through the feed channel 20, so that the material is heated and initially crystallized in the second heating chamber 50 and then participates in the circulation of the material.

[0052] Exemplarily, the forced circulation pump 40 is also called an axial flow pump, and the forced circulation pump 40 at least includes a motor 401 and an impeller (not shown in the figure), the impeller is arranged in the liquid outlet pipe 42, and the impeller is connected to the motor 401. The impeller is driven to rotate by the motor 401, and the liquid entering the liquid outlet pipe 42 flows at a high speed along the circulation direction by the thrust of the rotating impeller blades. Exemplarily, the evaporation system also includes a discharge part 102, which is arranged at the bottom 103 of the crystallization chamber 10 and is connected to the crystallization chamber 10, and is used to receive the crystals precipitated in the crystallization chamber 10.

[0053] By adopting the above technical solution, the crystallization chamber 10, the first heating chamber 30, the forced circulation pump 40 and the second heating chamber 50 are interconnected to form a circulation channel, and the material to be evaporated (such as industrial wastewater) can enter the circulation channel through the feed channel 20. When the evaporation system is running, the forced circulation pump 40 can make the material flow through the second heating chamber 50, the crystallization chamber 10, the first heating chamber 30, the liquid inlet pipe 41, and the liquid outlet pipe 42 in the circulation direction. In this way, by reducing the mass of the flow of the forced circulation pump 40, the power of the forced circulation pump 40 can be reduced, achieving energy saving and consumption reduction effects, and reducing the operating costs of the equipment. According to the flow calculation formula of the forced circulation pump 40: m=Q / cΔT, among them, Q is the evaporation load, c is the specific heat capacity (generally a constant value), m is the mass of the circulation pump flow, Δt is the temperature difference before and after the material passes through the heating chamber. Therefore, it can be seen from the formula that when the system evaporation load Q is a constant value (that is, under a certain evaporation load rating), in the design of the double heating chamber, the material is heated twice, which can increase the temperature difference before and after passing through the heating chamber, so as to reduce the mass m of the flow of the forced circulation pump 40, thereby reducing the power of the forced circulation pump 40 and achieving energy saving and consumption reduction effects.

[0054] For example, when there is only the first heating chamber 30, the temperature of the material before passing through the first heating chamber 30 is 35.5°C, and the temperature after being heated by the first heating chamber 30 is 36.5°C, then Δt is 1°C. In the evaporation system provided in the embodiment of the present application, the temperature of the material before passing through the first heating chamber 30 is 35.5°C, and the temperature after being heated by the first heating chamber 30 and the second heating chamber 50 is 37.5°C, at this time Δt is increased to 2°C.

[0055] On the other hand, through the design of the double heating chamber of the first heating chamber 30 and the second heating chamber 50, compared with the single heating chamber and other solutions, on the one hand, according to the formula: Q=SKΔt, wherein S is the heating area, Q is the evaporation load, K is a constant, Δt is the heat transfer temperature difference, and Δt is usually a fixed value. Therefore, it can be seen from the formula that when the heating area increases, the evaporation load will increase. Therefore, compared with the single heating chamber and other solutions, when the size and structure of the heating chamber are consistent, the design of the double heating chamber can effectively increase the heating area of ​​the material, and the evaporation load rating of the double heating chamber design is higher.

[0056] In some embodiments, see Figure 1, the evaporation system includes a first pipe 60 and a second pipe 70, and the first pipe 60 and the second pipe 70 are both arranged in the crystallization chamber 10. Exemplarily, along the first direction X, the crystallization chamber 10 is an upper part 11 and a lower part 12, the first pipe 60 passes through the upper part 11 and the lower part 12, and the second pipe 70 is arranged in the lower part 12, the upper part 11 is cylindrical, and the lower part 12 is truncated. It can be understood that the embodiment of the present application does not limit the shape of the upper part 11 and the lower part 12, for example, the upper part 11 can also be a rectangular parallelepiped, and the lower part 12 can also be conical. Exemplarily, the crystallization chamber 10 includes a plurality of support rods 13, and the plurality of support rods 13 are arranged in the upper part 11, and one end of the plurality of support rods 13 is arranged around the inner wall 101 of the crystallization chamber 10 at intervals, and the other end is arranged around the outer wall of the first pipe 60 at intervals.

[0057] In some embodiments, see Figure 1 , Figure 2 , along the circulation direction, the first pipeline 60 includes a first liquid inlet 61 and a first liquid outlet 62, the first liquid inlet 61 is arranged in the crystallization chamber 10, and the first liquid outlet 62 is connected to the first heating chamber 30, the second pipeline 70 includes a second liquid inlet 71 and a second liquid outlet 72, the second liquid outlet 72 is arranged in the crystallization chamber 10, and the second liquid inlet 71 is connected to the second heating chamber 50, the first liquid inlet 61 has a first height h1 in the crystallization chamber 10, and the first height h1 refers to the height of the first liquid inlet 61 relative to the bottom 103 of the crystallization chamber 10. The second liquid outlet 72 has a second height h2 in the crystallization chamber 10, and the second height h2 refers to the height of the highest point of the second outlet 72 relative to the bottom 103 of the crystallization chamber 10, and the first height h1 is greater than the second height h2. Exemplarily, one end of the support rod 13 is disposed on the inner wall 101 of the crystallization chamber 10 , and the other end is disposed on the outer wall of the first pipe 60 , for supporting the first liquid inlet 61 so that the first liquid inlet 61 can maintain the first height h1 .

[0058] The material circulates in the evaporation system along the circulation direction, and after passing through the first heating chamber 30 and the second heating chamber 50 in turn and entering the crystallization chamber 10, the material has reached the temperature for precipitating crystals. At this time, the crystals precipitated from the material in the crystallization chamber 10 sink to the bottom of the crystallization chamber 10 and enter the discharge portion 102, forming a clear liquid above the crystallization chamber 10. Since the first height h1 is greater than the second height h2, the crystals precipitated from the heated material after entering the crystallization chamber 10 will sink toward the bottom 103, that is, sink in the direction away from the first liquid inlet 61, thereby allowing as much clear liquid as possible to flow into the first liquid inlet 61 for the next heating and crystallization, and the cycle is repeated until the crystals in the material are completely precipitated.

[0059] Since each cycle uses clear liquid to participate in the cycle, compared with the slurry cycle in the prior art, that is, the mixed liquid with crystals participates in the circulation heating, the clear liquid circulation can ensure that the circulating material basically does not contain or contains a small amount of crystals, and the circulating material density is low, so as to reduce the risk of crystallization inside the heating tube 302 blocking the pipeline, and at the same time can reduce the operating power of the axial flow pump. For example, it can prevent the fine crystals in the material from accumulating in other pipelines of the evaporation system (for example, enriching and growing on the rough pipe wall until the pipeline is blocked), causing pipeline blockage and corrosion, which can effectively improve the evaporation efficiency and avoid cavitation caused by insufficient flow of the forced circulation pump 40 due to pipeline blockage.

[0060] In some embodiments, see Figure 1 , Figure 2 , along the first direction X, the space above the first liquid inlet 61 is defined as a first water holding space, and the space below the first liquid inlet 61 is defined as a second water holding space, the first water holding space and the second water holding space are connected, the first water holding space is used to hold a clear liquid excluding crystals, and the second water holding space is used to hold a mixed liquid including crystals, the second liquid outlet 72 is provided in the second water holding space, and the first water holding space has a third height h3, and the third height h3 is greater than the first height h1.

[0061] Exemplarily, the third height h3 refers to the height of the liquid level of the clear liquid in the first water-containing space relative to the bottom 103 of the crystallization chamber 10. The third height h3 is greater than the first height h1, which can ensure the stable operation of the material circulation, and can prevent the material from being lower than the first height h1 of the first liquid inlet 61, resulting in no material flowing into the first liquid inlet 61 to interrupt the circulation, and further ensure that the first liquid inlet 61 is in the second water-containing space, that is, it is ensured that almost all the liquid entering the first liquid inlet 61 is clear liquid, and the mixed liquid is prevented from entering the first liquid inlet 61 to participate in the circulation as much as possible, which can avoid the accumulation of crystals of the material in the first heating chamber 30. Exemplarily, the third height h3 can be 3m-5m, and the embodiment of the present application does not limit the specific value of the third height h3, for example, it can also be 1m, 2m, 3m, 4m, 5m, 6m, etc.

[0062] In some embodiments, see Figure 3 , Figure 4 , Figure 5 Combined with Figure 2The inner wall 601 of the first pipe 60 is provided with a first anti-vortex baffle 63. The first anti-vortex baffle 63 divides the inner wall 601 of the first pipe 60 into a first part 6011 and a second part 6012 along the radial direction Y. In the radial direction Y, the first anti-vortex baffle 63 and the first part 6011 together define a closed first flow channel 631, and the first anti-vortex baffle 63 and the second part 6012 together define a closed second flow channel 632. Exemplarily, the first liquid outlet 62 is provided outside the crystallization chamber 10, and the first anti-vortex baffle 63 is provided at the first liquid outlet 62. Since the materials flowing to the first heating chamber 30 through the first pipe 60 are all clear liquid, the first anti-vortex baffle 63 can prevent the clear liquid vortex from bringing the crystals in the crystallization chamber 10 into the first heating chamber 30, thereby corroding the heating pipe 302 of the first heating chamber 30. For example, the projection of the first anti-vortex baffle 63 in the axial direction Z is a straight line. When the number of the first anti-vortex baffle 63 is two, as shown in FIG. Figure 5 As shown, two first anti-vortex baffles 63 intersect, and the projection of the first anti-vortex baffles 63 in the axial direction Z is a cross. It can be understood that the embodiment of the present application does not limit the number of first anti-vortex baffles 63, for example, it can be 1, 3, 4, etc.

[0063] For example, reference Figure 3 , Figure 4 , Figure 5 Combined with Figure 2 , the inner wall 701 of the second pipe 70 is provided with a second anti-vortex baffle 73. The second anti-vortex baffle 73 divides the inner wall 701 of the second pipe 70 into a third part 7011 and a fourth part 7012 along the radial direction Y. In the radial direction Y, the second anti-vortex baffle 73 and the third part 7011 together define a closed third flow channel 731, and the second anti-vortex baffle 73 and the fourth part 7012 together define a closed fourth flow channel 732. Exemplarily, the second anti-vortex baffle 73 is provided at the second liquid outlet 72. Since the materials flowing to the second heating chamber 50 through the second pipe 70 are all clear liquids whose temperature reaches the crystallization temperature, that is, they are equivalent to mixed liquids including crystals, the second anti-vortex baffle 73 can prevent the vortex of the mixed liquid from rushing into the first liquid inlet 61. Exemplarily, the projection of the second anti-vortex baffle 73 on the axial direction Z is a straight line. When the number of the second anti-vortex baffles 73 is 2, such as Figure 5 As shown, two second anti-vortex baffles 73 intersect, and the projection of the second anti-vortex baffles 73 in the axial direction Z is a cross. It can be understood that the embodiment of the present application does not limit the number of second anti-vortex baffles 73, for example, it can be 1, 2, 3, 4, etc.

[0064] In addition, the embodiment of the present application does not limit the shapes of the first anti-vortex baffle 63 and the second anti-vortex baffle 73. For example, Figure 6 Combined with Figure 2, the projection of the second liquid outlet 72 in the radial direction Y is a right-angled trapezoid, and correspondingly, the second anti-vortex baffle 73 provided at the second liquid outlet 72 is also a right-angled trapezoid. It can be understood that the embodiment of the present application does not limit the positions of the first anti-vortex baffle 63 and the second anti-vortex baffle 73. For example, the first anti-vortex baffle 63 can also be provided at one end of the first heating chamber 30 connected to the second liquid outlet 72.

[0065] In the above technical solution, the inner wall 601 of the first pipe 60 is provided with a first anti-vortex baffle 63, and the inner wall 701 of the second pipe 70 is provided with a second anti-vortex baffle 73. It can be understood that in the embodiment of the present application, based on the comprehensive consideration of factors such as use cost and effect, only the first anti-vortex baffle 63 can be provided on the inner wall 601 of the first pipe 60, or only the second anti-vortex baffle 73 can be provided on the inner wall 701 of the second pipe 70.

[0066] In some embodiments, see Figure 1 , Figure 2 The evaporation system includes a first reducer 81, and the first reducer 81 includes a first small diameter end 811 and a first large diameter end 812. The first small diameter end 811 and the first large diameter end 812 indicate that the cross-sectional areas of the first reducer 81 in the radial direction Y are different, wherein the cross-sectional area of ​​the first small diameter end 811 is smaller than the cross-sectional area of ​​the first large diameter end 812. Exemplarily, along the circulation direction, the first small diameter end 811 is communicated with the second heating chamber 50, and the first large diameter end 812 is communicated with the second liquid inlet 71.

[0067] In some embodiments, see Figure 7 Combined with Figure 1 , Figure 2The evaporation system further includes a second reducer 82 and a third reducer 83. In the circulation direction, the second reducer 82 includes a second large diameter end 821 and a second small diameter end 822. The second large diameter end 821 and the second small diameter end 822 indicate that the cross-sectional areas of the second reducer 82 in the radial direction Y are different, wherein the cross-sectional area of ​​the second small diameter end 821 is smaller than the cross-sectional area of ​​the second large diameter end 822. The second large diameter end 821 is connected to the first heating chamber 30, and the second small diameter end 822 is connected to the liquid inlet pipe 41. In the circulation direction, the third reducer 83 includes a third small diameter end 831 and a third large diameter end 832. The third small diameter end 831 and the third large diameter end 832 indicate that the cross-sectional areas of the third reducer 83 in the radial direction Y are different, wherein the cross-sectional area of ​​the third small diameter end 831 is smaller than the cross-sectional area of ​​the third large diameter end 832. The third large diameter end 832 is connected to the second heating chamber 50, and the third small diameter end 831 is connected to the liquid outlet pipe 42. It can be understood that the embodiment of the present application does not limit the positions of the third large diameter end 832 and the third small diameter end 831 of the third reducer 83. For example, in order to facilitate the adaptation of the diameter of the liquid outlet pipe 42, along the circulation direction, the third reducer 83 includes a third large diameter end 832 and a third small diameter end 831, the third large diameter end 832 is connected to the liquid outlet pipe 42, and the third small diameter end 831 is connected to the second heating chamber 50.

[0068] Exemplarily, the first reducer 81, the second reducer 82 and the third reducer 83 are also called reducers, that is, along the flow direction of the fluid, the cross-sectional areas of the two ends of the reducers in the radial direction Y are not equal. In combination with the law of fluid movement, it can be known that along the circulation direction, when the material flows from the second heating chamber 50 through the first reducer 81 and the second liquid inlet 71 into the crystallization chamber 10, the material flows from the first small diameter end 811 with a smaller cross-sectional area to the first large diameter end 812 with a larger cross-sectional area, and the flow rate of the material is reduced. In this way, the flow rate of the material in and out of the crystallization chamber 10 can be lowered, thereby ensuring the sedimentation of the crystals precipitated in the material and the floating of the clear liquid.

[0069] Similarly, combined with the law of fluid movement, it can be known that along the circulation direction, when the material flows from the first heating chamber 30 through the second reducer 82 into the liquid inlet pipe 41, that is, the material flows from the second large diameter end 821 with a larger cross-sectional area to the second small diameter end 822 with a smaller cross-sectional area, the flow rate of the material increases. Similarly, when the material flows from the liquid outlet pipe through the third reducer 83 into the second heating chamber 50, the material flows from the third large diameter end 832 with a larger cross-sectional area to the third small diameter end 831 with a smaller cross-sectional area, and the flow rate of the material increases. In this way, the flow rate of the material can be increased when passing through the liquid inlet pipe 41 and the liquid outlet pipe 42 of the forced circulation pump 40, and the crystals that may be accumulated near the liquid outlet pipe 42 will be washed away, avoiding problems such as cavitation caused by crystal accumulation.

[0070] In some embodiments, the liquid inlet pipe 41 and the liquid outlet pipe 42 intersect, and the feed channel 20 extends along the first direction X, and the first direction X is not parallel to the ground. Exemplarily, the liquid inlet pipe 41 and the liquid outlet pipe 42 are perpendicular. Along the circulation direction, when the material flows from the first heating chamber 30 and the liquid inlet pipe 41 to the liquid outlet pipe 42, the material flows downward from a high place. Under the gravity of the material itself, the flow rate of the material when passing through the liquid inlet pipe 41 and the liquid outlet pipe 42 of the forced circulation pump 40 can be further increased, and the crystals that may be accumulated near the liquid outlet pipe 42 can be washed away, avoiding cavitation and other problems caused by crystal accumulation. Cavitation refers to the bubbles generated after the liquid vaporizes, which cause the metal surface of the impeller of the forced circulation pump 40 to peel off under the impact movement of the liquid particles, thereby damaging the impeller and other components.

[0071] In some embodiments, see Figure 8 Combined with Figure 1 The first heating chamber 30 and the second heating chamber 50 both include a shell 301 and a plurality of heating tubes 302, each of which is extended along the first direction X. The plurality of heating tubes 302 are arranged in the hollow shell 301 at intervals, and two adjacent heating tubes 302 are connected in sequence. Along the first direction X, a tube sheet 303 is provided at one end of the hollow shell 301 close to the crystallization chamber 10, and the plurality of heating tubes 302 are arranged in the tube sheet 303 at intervals. On the one hand, the tube sheet 303 can play a role in fixing the heating tube 302, and on the other hand, the tube sheet 303 can prevent the material from entering the hollow shell 301, so that the material can directly enter the heating tube 302. The first heating chamber 30 also includes a first steam channel 31, and the second heating chamber 50 also includes a second steam channel 51, which is used to pass hot steam into the hollow shell 301, and the hot steam contacts the outer wall (not shown in the figure) of the heating tube 302, and heats the material in the heating tube 302 through heat conduction. Exemplarily, the first steam channel 31 and the second steam channel 51 are in communication, and hot steam is introduced through the same steam inlet 304 .

[0072] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An evaporation system, characterized in that: include: Feed channel; Crystallization chamber; a first heating chamber, one end of which is in communication with the crystallization chamber; a second heating chamber, one end of which is in communication with the crystallization chamber; A forced circulation pump, the crystallization chamber, the first heating chamber, the forced circulation pump and the second heating chamber are interconnected to form a circulation channel, the feed channel is connected to the circulation channel, and is used to pass the material into the circulation channel, the forced circulation pump includes an inlet pipe and an outlet pipe, the inlet pipe is connected to the first heating chamber, and the outlet pipe is connected to the second heating chamber, and is used to make the material flow from the outlet pipe in the circulation direction through the second heating chamber, the crystallization chamber, the first heating chamber, the inlet pipe, and the outlet pipe in sequence.

2. The evaporation system according to claim 1, characterized in that include: A first pipeline, along the circulation direction, the first pipeline comprises a first liquid inlet and a first liquid outlet, the first liquid inlet is arranged in the crystallization chamber, the first liquid inlet has a first height in the crystallization chamber, and the first liquid outlet is connected to the first heating chamber; A second pipeline, along the circulation direction, the second pipeline includes a second liquid inlet and a second liquid outlet, the second liquid outlet is arranged in the crystallization chamber, the second liquid inlet is connected to the second heating chamber, the second liquid outlet has a second height in the crystallization chamber, and the first height is greater than the second height.

3. The evaporation system according to claim 2, characterized in that The inner wall of the first pipe is provided with a first anti-vortex baffle, and in the radial direction, the first anti-vortex baffle and the inner wall of the first pipe together define a first flow channel and a second flow channel, and / or, the inner wall of the second pipe is provided with a second anti-vortex baffle, and in the radial direction, the second anti-vortex baffle and the inner wall of the second pipe together define a third flow channel and a fourth flow channel.

4. The evaporation system according to claim 3, characterized in that The first liquid outlet is arranged outside the crystallization chamber, the first anti-vortex baffle is arranged at the first liquid outlet, and the second anti-vortex baffle is arranged at the second liquid outlet.

5. The evaporation system according to claim 3, characterized in that The projections of the first anti-vortex baffle and the second anti-vortex baffle in the axial direction are in a straight line shape or a cross shape.

6. The evaporation system according to claim 2, characterized in that include: A first reducer, along the circulation direction, comprises a first small-diameter end and a first large-diameter end, the first small-diameter end is communicated with the second heating chamber, and the first large-diameter end is communicated with the second liquid inlet.

7. The evaporation system according to claim 2, characterized in that It includes a connecting pipe, one end of which is connected to the liquid outlet pipe, and the other end is connected to the second heating chamber. The feed channel is connected to the connecting pipe. Along a first direction, the feed channel is closer to the ground than the crystallization chamber, and the first direction is not parallel to the ground.

8. The evaporation system according to claim 2, characterized in that include: A second reducer, along the circulation direction, the second reducer comprises a second large-diameter end and a second small-diameter end, the second large-diameter end is communicated with the first heating chamber, and the second small-diameter end is communicated with the liquid inlet pipe; A third reducer, along the circulation direction, the third reducer includes a third small diameter end and a third large diameter end, the third small diameter end is connected to the liquid outlet pipe, and the third large diameter end is connected to the second heating chamber, or, along the circulation direction, the third reducer includes a third large diameter end and a third small diameter end, the third large diameter end is connected to the liquid outlet pipe, and the third small diameter end is connected to the second heating chamber.

9. The evaporation system according to claim 1, characterized in that The liquid inlet pipe and the liquid outlet pipe intersect, and the liquid inlet pipe is extended along a first direction, and the first direction is not parallel to the ground.

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