Multi-effect evaporative crystallization wastewater treatment and recovery equipment

Abstract

The utility model belongs to the field of wastewater treatment, in particular relates to multi-effect evaporative crystallization wastewater treatment and recovery equipment, and provides the following scheme aiming at the problems that the contact time with steam is difficult to adjust according to wastewater with different concentrations and the concentration process of the wastewater is inconvenient to manage more effectively in the multi-effect evaporative crystallization wastewater treatment and recovery equipment in the prior art. The device comprises a plurality of evaporators, each evaporator comprises a tank body, a liquid inlet end and an air inlet end are arranged on one side of the outer wall of each tank body, a liquid conveying end is arranged at the bottom end of each tank body, and an air outlet end is arranged on the other side of the outer wall of each tank body; the multiple sets of threaded pipes are used for prolonging the contact time of the wastewater and steam, water is gradually evaporated to form steam, solute is gradually concentrated, the steam and the concentrated wastewater enter the next evaporator, harmful substances in the wastewater are effectively separated out in the evaporation and crystallization process, and pollution to the environment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a multi-effect evaporation crystallization wastewater treatment and recycling device. Background Art

[0002] Traditional wastewater treatment methods often have deficiencies such as low treatment efficiency, high energy consumption, and secondary pollution. Especially for high-concentration organic wastewater or saline wastewater, the treatment is more difficult and the cost is higher.

[0003] As an advanced wastewater treatment technology, multi-effect evaporation crystallization technology has gradually received extensive attention in the industry. Through the series or parallel combination of multiple evaporators, the continuous separation of water and solutes in wastewater is achieved. In the multi-stage evaporation process, the wastewater is gradually heated and evaporated, the water is removed in the form of steam, and the solutes are gradually concentrated and finally form crystals. This process can not only effectively reduce the pollutant concentration in the wastewater, but also recycle and reuse the useful substances in the wastewater, realizing the resource utilization of the wastewater.

[0004] The existing contact time between wastewater and steam is relatively short, resulting in room for improvement in the heat exchange efficiency between the two. Moreover, it is difficult to adjust the contact time with steam according to different concentrations of wastewater, which is inconvenient for more effectively managing the concentration process of wastewater in the multi-effect evaporation crystallization wastewater treatment and recycling device. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the deficiencies in the prior art that the contact time between wastewater and steam is relatively short, resulting in room for improvement in the heat exchange efficiency between the two, and it is difficult to adjust the contact time with steam according to different concentrations of wastewater, which is inconvenient for more effectively managing the concentration process of wastewater in the multi-effect evaporation crystallization wastewater treatment and recycling device, and to propose a multi-effect evaporation crystallization wastewater treatment and recycling device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A multi-effect evaporation crystallization wastewater treatment and recycling device includes multiple evaporators. Each evaporator includes a tank body. One side of the outer wall of the tank body is provided with a liquid inlet end and a gas inlet end. The bottom end of the tank body is provided with a liquid outlet end. The other side of the outer wall of the tank body is provided with a gas outlet end.

[0008] Multiple groups of threaded pipes are used to increase the contact time between wastewater and steam. Multiple groups of the threaded pipes are respectively located inside multiple tank bodies, and each group of threaded pipes is provided with multiple.

[0009] Multiple flow-limiting plates are used to adjust the flow rate of wastewater. Multiple flow-limiting plates are respectively located inside multiple tank bodies.

[0010] A driving component is used to drive the current-limiting disc to rotate, and the driving component is arranged above the multiple tanks.

[0011] In a possible design, two partition plates are fixedly arranged inside each of the tanks, and multiple threaded pipes are located between the two partition plates. The two ends of the threaded pipe respectively penetrate through the two partition plates, and multiple through holes are formed on the surface of the lower partition plate.

[0012] In a possible design, the current-limiting disc is rotatably arranged on the top of the upper partition plate. Multiple through openings are formed on the surface of the current-limiting disc, and the multiple through openings respectively cooperate with the tops of the multiple threaded pipes.

[0013] In a possible design, the liquid inlet end is located above the current-limiting disc, and the gas inlet end and the gas outlet end are both located between the two partition plates.

[0014] In a possible design, the driving component includes multiple connecting shafts. The bottom ends of the multiple connecting shafts are respectively fixedly arranged at the centers of the tops of the multiple current-limiting discs, and the top ends of the connecting shafts rotatably penetrate through the tanks.

[0015] In a possible design, the driving component further includes a servo motor. The same housing is arranged above the multiple tanks. The servo motor is fixedly arranged inside the housing. A rotating shaft is rotatably arranged inside the housing. A transmission gear is fixedly sleeved on the outer wall of the rotating shaft. A reduction gear is fixedly sleeved on the outer wall of the output shaft of the servo motor, and the reduction gear meshes with the transmission gear. The top ends of the multiple connecting shafts rotatably penetrate into the inside of the housing. Synchronous wheels are fixedly sleeved on the outer walls of the multiple connecting shafts located inside the housing and on the outer wall of the rotating shaft. The same synchronous belt is sleeved on the outer walls of the multiple synchronous wheels in a transmission manner.

[0016] In a possible design, the gas outlet end of the evaporator is communicated with the gas inlet end close to the evaporator through a first pipeline, and a vacuum pump is installed on the first pipeline. The liquid infusion end of the evaporator is communicated with the liquid inlet end close to the evaporator through a second pipeline, and a feeding pump is installed on the second pipeline.

[0017] In this application, during specific use, the liquid inlet end of the first evaporator is connected to the wastewater pipe, the gas inlet end is connected to the steam pipe, the gas outlet end of the last evaporator is connected to the condenser, and the liquid delivery end is connected to the separator. After the wastewater enters the interior of the tank through the liquid inlet end, it enters the interior of the threaded pipe through the through-hole. The steam enters the interior of the tank through the gas inlet end. At this time, the wastewater is heated and evaporated, and the water gradually evaporates to form steam, while the solute gradually concentrates. Then, the initially concentrated wastewater enters the interior of the next evaporator through the liquid delivery end, and the steam enters the interior of the next evaporator through the gas outlet end together, enabling the steam to be reused in the next-stage evaporator. In this way, the steam can be recycled multiple times, improving the energy efficiency. As the wastewater is continuously concentrated in the evaporator, when the solute reaches the saturation concentration, it crystallizes into solid substances, and these crystals are recycled through the separation equipment, further reducing waste emissions. When treating high-concentration wastewater, by adjusting the flow-limiting disc, the communication hole between the through-hole and the threaded pipe is increased, so that for wastewater with a relatively high concentration, the contact time between the wastewater and the steam is reduced, preventing the wastewater from reaching saturation too quickly and precipitating a large amount of crystals. When the wastewater concentration is low, the flow-limiting disc is adjusted to reduce the communication hole between the through-hole and the threaded pipe, increasing the contact time with the steam, ensuring that the wastewater fully absorbs the heat of the steam and evaporates within the specified number of cycles, and thus gradually concentrating to the specified concentration. By driving the servo motor, the rotating shaft is driven to rotate through the reduction gear and the transmission gear, and then multiple connecting shafts are driven to rotate through the synchronous pulley, and the connecting shaft drives the flow-limiting disc to rotate for adjustment.

[0018] In the present utility model, for the multi-effect evaporation crystallization wastewater treatment and recycling equipment, through multiple threaded pipes, the contact between the wastewater and the steam can be increased, thereby better increasing the heat absorption efficiency on the original basis, reducing the number of corresponding evaporators, and thus reducing the space occupied by the equipment and the cost.

[0019] In the present utility model, for the multi-effect evaporation crystallization wastewater treatment and recycling equipment, through the flow-limiting disc, by adjusting the contact time between wastewater of different concentrations and the steam, the concentration process of the wastewater can be more effectively managed in the multi-effect evaporation crystallization wastewater treatment and recycling equipment. For wastewater with a relatively high concentration, premature blockage inside the evaporator can be prevented. For wastewater with a relatively low concentration, it is ensured that the wastewater can gradually reach the expected concentration effect when passing through the multi-effect evaporator.

[0020] In the present utility model, during use, the wastewater and the steam enter the interior of the tank through the liquid inlet end and the gas inlet end respectively. Then, the wastewater enters the interior of the threaded pipe, and the wastewater is heated and evaporated. The water gradually evaporates to form steam, while the solute gradually concentrates. The steam and the concentrated wastewater enter the interior of the next evaporator, and the harmful substances in the wastewater are effectively separated during the evaporation and crystallization processes, reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 1 is a schematic diagram of the main structure of a multi-effect evaporation crystallization wastewater treatment and recovery device proposed by the present utility model;

[0022] Figure 2 FIG. 2 is a schematic cross-sectional structure diagram of the tank body of a multi-effect evaporation crystallization wastewater treatment and recovery device proposed by the present utility model;

[0023] Figure 3 FIG. 3 is a schematic cross-sectional structure diagram of the outer shell of a multi-effect evaporation crystallization wastewater treatment and recovery device proposed by the present utility model.

[0024] In the figures: 1, tank body; 2, air inlet end; 3, liquid inlet end; 4, outer shell; 5, air outlet end; 6, liquid delivery end; 7, through hole; 8, threaded pipe; 9, partition plate; 10, flow limiting plate; 11, connecting shaft; 12, through port; 13, synchronous pulley; 14, synchronous belt; 15, reduction gear; 16, transmission gear; 17, rotating shaft; 18, servo motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Hereinafter, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Embodiment

[0026] Referring to Figure 1 , a multi-effect evaporation crystallization wastewater treatment and recovery device, which is applied in the field of wastewater treatment, includes: a plurality of evaporators, a plurality of groups of threaded pipes, a plurality of flow limiting plates, and a driving assembly. Each evaporator is composed of a tank body 1. A liquid inlet end 3 and an air inlet end 2 are arranged on one side of the tank body 1 for respectively introducing the wastewater to be treated and heating steam. A liquid delivery end 6 is arranged at the bottom end of the tank body 1 for outputting the treated wastewater, and an air outlet end 5 is arranged on the other side for discharging steam.

[0027] Referring to Figure 1-2 , inside the tank body 1, two partition plates 9 are fixedly arranged, and a plurality of groups of threaded pipes 8 are evenly arranged between the two partition plates 9. Both ends of each threaded pipe penetrate through the two partition plates 9 respectively to increase the contact area and contact time between the wastewater and the steam, and improve the heat exchange efficiency.

[0028] The wastewater enters the tank body 1 through the liquid inlet end 3, is distributed by the flow limiting plate 10 and then enters the threaded pipe 8, exchanges heat with the steam entering through the air inlet end 2, the steam generated by evaporation is discharged through the air outlet end 5, and the treated wastewater is discharged through the liquid delivery end 6. A vacuum pump is installed between adjacent evaporators through a first pipeline and a feeding pump is installed through a second pipeline to form a multi-effect evaporation system, improving the energy utilization efficiency.

[0029] The current-limiting disk 10 is rotatably arranged on the top of the upper partition disk 9, and its surface is designed with a plurality of through ports 12, which are matched with the top ends of the threaded pipes 8 to control the flow rate of the wastewater flowing into the threaded pipes 8. For wastewater that already has a relatively high concentration, reducing its contact time with the steam can prevent the wastewater from reaching saturation too quickly and precipitating a large amount of crystals, which can prevent premature blockage inside the evaporator and maintain the stable operation of the system. At the same time, reducing the contact time also helps to save energy because the evaporation process itself is an energy-consuming process.

[0030] Increasing the contact time for low-concentration wastewater: For low-concentration wastewater, increasing its contact time with the steam can ensure that the wastewater fully absorbs the heat of the steam and evaporates within a specified number of cycles, so as to gradually concentrate to the specified concentration. This can improve the treatment efficiency of the wastewater and ensure that the wastewater can gradually achieve the expected concentration effect when passing through the multi-effect evaporator. Embodiment

[0031] Reference Figure 3 , on the basis of Embodiment 1 for improvement: The driving assembly is composed of a plurality of connecting shafts 11, a servo motor 18, a housing 4, a rotating shaft 17, a transmission gear 16, a reduction gear 15, a synchronous pulley 13 and a synchronous belt 14. The bottom ends of the plurality of connecting shafts 11 are respectively fixedly connected to the top center of the current-limiting disk 10, and the top ends pass through the tank body 1 and extend into the housing 4. Inside the housing 4, the servo motor 18 is engaged with the transmission gear 16 through the reduction gear 15 to drive the rotating shaft 17 to rotate. At the same time, synchronous pulleys 13 are fixedly sleeved on the outer walls of each connecting shaft 11 and the rotating shaft 17, and these synchronous pulleys 13 are connected by the synchronous belt 14 to achieve synchronous rotation, thereby driving all the current-limiting disks 10 to rotate synchronously.

[0032] However, as is well known to those skilled in the art, the working principle and wiring method of the servo motor 18 are common knowledge, and they all belong to conventional means or well-known common sense, so they will not be elaborated here. Those skilled in the art can make any selection according to their needs or convenience.

[0033] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A multi-effect evaporation crystallization wastewater treatment and recovery equipment, characterized in that: include: A plurality of evaporators, the evaporators comprising a tank body (1), a liquid inlet end (3) and a gas inlet end (2) being arranged on one side of an outer wall of the tank body (1), a liquid infusion end (6) being arranged at the bottom end of the tank body (1), and a gas outlet end (5) being arranged on the other side of the outer wall of the tank body (1); A plurality of groups of threaded pipes (8) are used to increase the contact time between the wastewater and the steam, the plurality of groups of threaded pipes (8) being respectively located inside the plurality of tank bodies (1), and each group of threaded pipes (8) is provided with a plurality of them; A plurality of flow limiting discs (10) for regulating the flow of wastewater, wherein the plurality of flow limiting discs (10) are respectively located inside the plurality of tank bodies (1); A drive assembly is used to drive the flow limiting disc (10) to rotate, and the drive assembly is arranged above the plurality of tank bodies (1).

2. A multi-effect evaporation crystallization wastewater treatment and recovery equipment according to claim 1, characterized in that: Two partition plates (9) are fixedly arranged inside the tank body (1), and a plurality of threaded tubes (8) are located between the two partition plates (9). Both ends of the threaded tubes (8) respectively penetrate the two partition plates (9), and a plurality of through holes (7) are opened on the surface of the partition plates (9) located below.

3. A multi-effect evaporation crystallization wastewater treatment and recovery equipment according to claim 2, characterized in that: The flow limiting disk (10) is rotatably arranged on the top of the upper partition disk (9), and a plurality of through openings (12) are provided on the surface of the flow limiting disk (10), and the plurality of through openings (12) respectively cooperate with the top ends of the plurality of threaded tubes (8).

4. A multi-effect evaporation crystallization wastewater treatment and recovery equipment according to claim 3, characterized in that: The liquid inlet end (3) is located above the flow limiting disk (10), and the gas inlet end (2) and the gas outlet end (5) are both located between two partition disks (9).

5. A multi-effect evaporation crystallization wastewater treatment and recovery equipment according to claim 4, characterized in that: The driving assembly comprises a plurality of connecting shafts (11), the bottom ends of the plurality of connecting shafts (11) being fixedly arranged at the top centers of the plurality of flow limiting disks (10) respectively, and the top ends of the connecting shafts (11) being rotatably penetrated through the tank body (1).

6. A multi-effect evaporation crystallization wastewater treatment and recovery equipment according to claim 5, characterized in that: The driving assembly further comprises a servo motor (18). A common housing (4) is disposed above the plurality of tank bodies (1). The servo motor (18) is fixedly disposed inside the housing (4). A rotating shaft (17) is rotatably disposed inside the housing (4). A transmission gear (16) is fixedly sleeved on the outer wall of the rotating shaft (17). A reduction gear (15) is fixedly sleeved on the outer wall of the output shaft of the servo motor (18), and the reduction gear (15) is meshed with the transmission gear (16). The top ends of the plurality of connecting shafts (11) are rotatably penetrated into the housing (4). The outer walls of the plurality of connecting shafts (11) located inside the housing (4) and the outer wall of the rotating shaft (17) are both fixedly sleeved with synchronous wheels (13). The outer wall transmission sleeves of the plurality of synchronous wheels (13) are provided with a common synchronous belt (14).

7. A multi-effect evaporation crystallization wastewater treatment and recovery equipment according to claim 1, characterized in that: The gas outlet end (5) of the evaporator is connected to the gas inlet end (2) close to the evaporator through a No. 1 pipeline, and the No. 1 pipeline is equipped with a vacuum pump. The liquid infusion end (6) of the evaporator is connected to the liquid inlet end (3) close to the evaporator through a No. 2 pipeline, and the No. 2 pipeline is equipped with a feeding pump.

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