Evaporative crystallization device for chlor-alkali production wastewater

Abstract

The utility model relates to the technical field of evaporative crystallization equipment, in particular to a chlor-alkali production wastewater evaporative crystallization device which comprises an evaporation tower, a heating assembly, a feeding assembly and a centrifugal assembly, the heating assembly is installed at the bottom of the evaporation tower and used for heating liquid in the evaporation tower, and then wastewater evaporation is achieved; the feeding assembly is mounted in the evaporation tower, the feeding assembly is provided with flow guide pipes in the evaporation tower, so that to-be-crystallized water flows to the bottom through the flow guide pipes, and in the crystallization process, hot water vapor continues to heat the water in the flow guide pipes in the process of rising through gaps between the flow guide pipes, so that multi-stage evaporation is realized; the centrifugal assembly is mounted in the evaporation tower, the centrifugal assembly performs zero stirring on a solution to be crystallized through centrifugal rotation, and meanwhile, precipitation of crystals is accelerated through centrifugation.

Description

Technical Field

[0001] This utility model relates to the technical field of evaporation crystallization equipment, specifically to an evaporation crystallization device for chlor-alkali production wastewater. Background Technology

[0002] The chlor-alkali production wastewater evaporation and crystallization unit is a key piece of equipment used to treat high-salt wastewater from the chlor-alkali industry. It primarily uses evaporation and crystallization processes to remove water from the wastewater and cause salt to crystallize and precipitate, thus achieving salt-water separation. This unit typically consists of a pretreatment system, an evaporation system, a crystallization system, and a centrifugal dehydration system. Employing technologies such as multi-effect evaporation or mechanical vapor recompression (MVR), it features high efficiency and energy saving, a high degree of automation, and stable and reliable operation. It can achieve zero wastewater discharge, and the recovered crystallized salt can be reused as an industrial raw material.

[0003] Existing wastewater evaporation crystallization devices evaporate wastewater by heating it, but the water vapor generated during evaporation and crystallization is not utilized in a timely manner. At the same time, the low-temperature wastewater to be treated cannot be properly preheated during transportation, which leads to a decrease in evaporation efficiency.

[0004] Therefore, this utility model provides an evaporation and crystallization device for chlor-alkali production wastewater to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is that the existing wastewater evaporation and crystallization device evaporates wastewater by heating it, but the water vapor generated by evaporation and crystallization is not utilized in time. At the same time, the low-temperature wastewater to be treated cannot be well preheated during transportation, which leads to a reduction in evaporation efficiency.

[0006] This utility model provides the following technical solution: a chlor-alkali production wastewater evaporation and crystallization device, comprising an evaporation tower, a heating component, a feeding component, and a centrifugal component. The heating component is installed at the bottom of the evaporation tower to heat the liquid inside, thereby achieving wastewater evaporation. The feeding component is installed inside the evaporation tower and, through a guide pipe installed inside the evaporation tower, allows the water to be crystallized to flow to the bottom. During the crystallization process, hot water vapor rises through the gaps between the guide pipes, further heating the water inside, thus achieving multi-stage evaporation. The centrifugal component is installed inside the evaporation tower and, through centrifugal rotation, stirs the solution to be crystallized, while simultaneously accelerating crystal precipitation.

[0007] Preferably, the heating assembly includes a heating chamber, heating wires, a sealing end cap, and a heat equalizing plate. The heating chamber is installed at the bottom of the evaporation tower, the heating wires are installed inside the heating chamber and are spirally distributed, the sealing end cap is installed at the top of the heating chamber, and a heat equalizing plate is installed on the sealing end cap.

[0008] Preferably, the heat-equalizing plate has a double-layer structure; a heat-conducting gas is provided in the interlayer of the heat-equalizing plate.

[0009] Preferably, the feeding assembly includes a feed inlet, a water equalization chamber, a filter screen, and a guide pipe; the feed inlet is installed at the top of the evaporation tower, a water equalization chamber is provided at one end of the feed inlet, a filter screen is provided at the top of the water equalization chamber, and a guide pipe is provided at the bottom of the water equalization chamber.

[0010] Preferably, the flow guide array is arranged at the bottom of the water equalization tank, and adjacent flow guides do not contact each other.

[0011] Preferably, the centrifugal assembly includes an air inlet chamber, a rotating rod, a drive fan blade, and a stirring rod. The air inlet chamber is installed on top of the feeding assembly, the rotating rod is installed inside the air inlet chamber, the drive fan blade is arranged in an array on the upper end of the rotating rod, and the stirring rod is installed on the lower end of the rotating rod.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. This utility model sets up a feeding component and a guide pipe in the crystallizer so that the water to be crystallized flows to the bottom through the guide pipe. During the crystallization process, hot water vapor rises through the gaps between the guide pipes and continues to heat the water in the guide pipes, thereby achieving multi-stage evaporation and improving the efficiency of evaporation crystallization. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the feeding assembly of this utility model;

[0018] Figure 4This is a schematic diagram of the centrifuge assembly of this utility model;

[0019] Figure 5 This is a cross-sectional schematic diagram of the present invention;

[0020] Figure 6 This is an enlarged schematic diagram of point A of this utility model.

[0021] In the diagram: 1. Evaporation tower; 2. Heating assembly; 21. Heating chamber; 22. Heating wire; 23. Sealing end cap; 24. Heat equalization plate; 3. Feeding assembly; 31. Feed inlet; 32. Water equalization chamber; 33. Filter screen; 34. Guide pipe; 4. Centrifugal assembly; 41. Air inlet chamber; 42. Air inlet; 43. Air outlet; 44. Rotating rod; 45. Drive fan blade; 46. Stirring rod. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely represents some embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and "back side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is conventionally placed during use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0025] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] This disclosure aims to address the problems of existing wastewater evaporation crystallization devices, which heat wastewater for evaporation but fail to utilize the generated steam in a timely manner. Furthermore, the low-temperature wastewater cannot be adequately preheated during transportation, leading to reduced evaporation efficiency. Therefore, this disclosure proposes an evaporation crystallization device for chlor-alkali production wastewater. By incorporating a feeding assembly and a guide pipe within the crystallizer, the water to be crystallized flows to the bottom through the guide pipe. During crystallization, hot steam rises through the gaps between the guide pipes, further heating the water within the pipes, thus achieving multi-stage evaporation and improving evaporation crystallization efficiency.

[0027] like Figures 1 to 6 As shown, a chlor-alkali production wastewater evaporation and crystallization device includes an evaporation tower 1, a heating component 2, a feeding component 3, and a centrifugal component 4. The heating component 2 is installed at the bottom of the evaporation tower 1 to heat the liquid inside the evaporation tower 1, thereby achieving wastewater evaporation. The feeding component 3 is installed inside the evaporation tower 1. The feeding component 3 uses a guide pipe 34 installed inside the evaporation tower 1 to allow the water to be crystallized to flow to the bottom through the guide pipe 34. During the crystallization process, hot water vapor rises through the gaps between the guide pipes 34, further heating the water inside the guide pipes 34, thereby achieving multi-stage evaporation. The centrifugal component 4 is installed inside the evaporation tower 1. The centrifugal component 4 stirs the solution to be crystallized through centrifugal rotation, and simultaneously accelerates the precipitation of crystals through centrifugation.

[0028] By setting up the feeding component 3 and the guide pipe 34 in the crystallizer, the water to be crystallized flows to the bottom through the guide pipe 34. During the crystallization process, hot water vapor rises through the gaps between the guide pipes 34 and continues to heat the water in the guide pipes 34, thereby achieving multi-stage evaporation and improving the efficiency of evaporation crystallization.

[0029] like Figure 1 and Figure 6As shown, the heating assembly 2 includes a heating chamber 21, heating wires 22, a sealing end cap 23, and a heat equalization plate 24. The heating chamber 21 is installed at the bottom of the evaporation tower 1 and is used to store the heating wires 22. The heating wires 22 are installed inside the heating chamber 21 and are spirally distributed. The heating wires 22 are used to heat the wastewater. The sealing end cap 23 is installed at the top of the heating chamber 21 and is used to transfer heat to the heat equalization plate 24. The heat equalization plate 24 is installed on the sealing end cap 23 and is used to ensure that the wastewater is heated evenly.

[0030] By setting the heating wires 22 in a spiral distribution inside the heating chamber 21, the contact area with the liquid can be increased, and the heating efficiency can be improved. The heat distribution plate 24 is installed on the sealing end cap 23 at the top of the heating chamber 21, which can make the heat evenly distributed at the bottom of the evaporation tower 1, avoid local overheating, and ensure that the wastewater evaporation process is stable and efficient. At the same time, the synergistic effect of the spiral heating wires 22 and the heat distribution plate 24 further improves the thermal energy utilization efficiency and evaporation effect of the device.

[0031] like Figure 6 As shown, the heat distribution plate 24 has a double-layer structure; a heat-conducting gas is installed in the interlayer of the heat distribution plate 24; the double-layer structure combined with the heat-conducting gas can ensure uniform heat distribution, effectively prevent local overheating, and improve heating efficiency. At the same time, the installation of the heat-conducting gas can enhance the heat transfer effect, ensure uniform heating at the bottom of the evaporation tower 1, thereby improving the uniformity and efficiency of wastewater evaporation.

[0032] like Figures 1 to 3 As shown, the feeding assembly 3 includes a feed inlet 31, a water equalization chamber 32, a filter screen 33, and a guide pipe 34. The feed inlet 31 is installed at the top of the evaporation tower 1 and is used to add wastewater to be treated into the water equalization chamber 32. The water equalization chamber 32 is provided at one end of the feed inlet 31 and is used to equalize the wastewater. The filter screen 33 is provided at the top of the water equalization chamber 32 and is used to filter the wastewater to be treated to prevent scale from affecting the crystallization efficiency. The guide pipe 34 is provided at the bottom of the water equalization chamber 32 and is used to guide the wastewater to be treated, and at the same time, the water in the guide pipe 34 is preheated by steam.

[0033] The water distribution chamber 32 connected to the feed inlet 31 can evenly distribute the wastewater and ensure that the wastewater flows steadily into the evaporation system; the filter screen 33 at the top of the water distribution chamber 32 can effectively intercept impurities, prevent scale formation, and ensure crystallization efficiency; while the guide pipe 34 at the bottom of the water distribution chamber 32 not only guides the wastewater to the bottom of the evaporation tower 1, but also uses the rising hot steam to preheat the wastewater in the pipe, realize multi-stage evaporation, and improve the overall evaporation efficiency.

[0034] like Figure 3As shown, the flow guide pipes 34 are arranged in an array at the bottom of the water equalization tank 32, and the adjacent flow guide pipes 34 do not contact each other. The purpose of the above design is to create gaps between adjacent flow guide pipes 34 so that the rising steam can better preheat the water in the flow guide pipes 34 through these gaps, thereby improving the evaporation efficiency of wastewater.

[0035] like Figures 1 to 5 As shown, the centrifugal assembly 4 includes an air inlet chamber 41, an air inlet 42, an air outlet 43, a rotating rod 44, driving fan blades 45, and a stirring rod 46. The air inlet chamber 41 is installed on the top of the feeding assembly 3 and is used to supply water vapor. The air outlet 43 and the air inlet 42 are installed on the side of the air inlet chamber 41, and the air outlet 43 is connected to the outside. The air outlet 43 is used to discharge water vapor. The rotating rod 44 is installed inside the air inlet chamber 41 and is used to rotate to drive the stirring rod 46 to rotate. The driving fan blades 45 are arranged in an array at the upper end of the rotating rod 44 and are used to rotate under the push of water vapor to drive the rotating rod 44 to rotate. The stirring rod 46 is installed at the lower end of the rotating rod 44 and is used to stir the wastewater to be treated under the rotation of the rotating rod 44, thereby achieving its rapid crystallization effect.

[0036] During operation, the heated water vapor moves upward and enters the air inlet chamber 41. At this time, the water vapor drives the drive fan blade 45 to rotate. The rotating drive fan blade 45 drives the rotating rod 44 to rotate. The water vapor rotates to the air outlet 43 and flows out. At the same time, the rotating rod 44 rotates and drives the stirring rod 46 to stir, thereby improving the crystallization efficiency.

[0037] Steam is introduced through the air inlet chamber 41, and the kinetic energy of the steam drives the fan blades 45 to rotate, which in turn drives the rotating rod 44 and the stirring rod 46 to agitate the wastewater. This process requires no additional power input, cleverly converting the kinetic energy of the steam into mechanical energy, achieving energy-efficient and high-performance agitation. Simultaneously, the rotation of the stirring rod 46 ensures that the wastewater to be treated is uniformly heated within the evaporation tower 1, accelerating crystal precipitation, significantly improving crystallization efficiency, and enhancing the wastewater treatment effect.

[0038] The overall working process is as follows: the wastewater to be treated flows from the feed inlet 31 to the water equalization chamber 32, and then is filtered through the filter screen 33; at this time, the waste liquid to be treated flows from the guide pipe 34 to the bottom of the evaporation tower 1 after being evenly distributed through the water equalization chamber 32. At this time, the heating wire 22 in the heating chamber 21 starts to heat the wastewater to be treated to complete the evaporation and crystallization process. During the evaporation and crystallization process, the water vapor will move upward and exchange heat with the waste liquid to be treated in the guide pipe 34 to preheat the wastewater to be treated. At the same time, the water vapor enters the air inlet chamber 41. At this time, the water vapor drives the drive fan blade 45 to rotate. The rotating drive fan blade 45 drives the rotating rod 44 to rotate. The water vapor rotates to the air outlet 43 and flows out. At the same time, the rotating rod 44 rotates and drives the stirring rod 46 to stir, thereby further improving the evaporation efficiency.

[0039] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A chlor-alkali production wastewater evaporation and crystallization device, characterized in that, The system includes an evaporation tower (1), a heating component (2), a feeding component (3), and a centrifugal component (4). The heating component (2) is installed at the bottom of the evaporation tower (1) to heat the liquid inside the evaporation tower (1) and thus achieve wastewater evaporation. The feeding component (3) is installed inside the evaporation tower (1). The feeding component (3) allows the water to be crystallized to flow to the bottom through the guide pipe (34) set inside the evaporation tower (1). During the crystallization process, hot water vapor rises through the gaps between the guide pipes (34) and continues to heat the water inside the guide pipes (34), thus achieving multi-stage evaporation. The centrifugal component (4) is installed inside the evaporation tower (1). The centrifugal component (4) stirs the solution to be crystallized by centrifugal rotation and accelerates the precipitation of crystals by centrifugation.

2. The evaporation crystallization device for chlor-alkali production wastewater according to claim 1, characterized in that: The heating assembly (2) includes a heating chamber (21), a heating wire (22), a sealing end cap (23), and a heat equalizing plate (24). The heating chamber (21) is installed at the bottom of the evaporation tower (1). The heating wire (22) is installed inside the heating chamber (21) and the heating wire (22) is spirally distributed. The sealing end cap (23) is installed at the top of the heating chamber (21), and the heat equalizing plate (24) is installed on the sealing end cap (23).

3. The evaporation crystallization device for chlor-alkali production wastewater according to claim 2, characterized in that: The heat-equalizing plate (24) has a double-layer structure; a heat-conducting gas is provided in the interlayer of the heat-equalizing plate.

4. The evaporation crystallization device for chlor-alkali production wastewater according to claim 3, characterized in that: The feeding assembly (3) includes a feed inlet (31), a water equalization chamber (32), a filter screen (33), and a guide pipe (34); the feed inlet (31) is installed at the top of the evaporation tower (1), a water equalization chamber (32) is provided at one end of the feed inlet (31), a filter screen (33) is provided at the top of the water equalization chamber (32), and a guide pipe (34) is provided at the bottom of the water equalization chamber (32).

5. A chlor-alkali production wastewater evaporation crystallization device according to claim 4, characterized in that: The flow guide pipes (34) are arranged in an array at the bottom of the water equalization tank (32), and adjacent flow guide pipes (34) do not contact each other.

6. A chlor-alkali production wastewater evaporation crystallization device according to claim 5, characterized in that: The centrifugal assembly (4) includes an air inlet chamber (41), an air inlet (42), an air outlet (43), a rotating rod (44), a drive fan blade (45), and a stirring rod (46). The air inlet chamber (41) is installed on the top of the feeding assembly (3). The air outlet (43) and the air inlet (42) are installed on the side of the air inlet chamber (41), and the air outlet (43) is connected to the outside. The rotating rod (44) is installed inside the air inlet chamber (41). The drive fan blade (45) is arranged in an array on the upper end of the rotating rod (44), and the stirring rod (46) is installed on the lower end of the rotating rod (44).

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