A counter-current evaporation separation device

Abstract

The application relates to the technical field of evaporation separation equipment, in particular to a countercurrent evaporation separation device which comprises a countercurrent evaporation separation body, an original liquid pump, a circulating pump, an evaporation heating chamber and a surface condenser, the side of the countercurrent evaporation separation body is provided with an original liquid inlet which is communicated with the outlet of the original liquid pump, the side of the conical bottom is provided with a circulating liquid outlet which is connected with the inlet of the circulating pump, the bottom is provided with a concentrated liquid outlet, the top is provided with a secondary steam outlet which is connected with the inlet of the surface condenser, the outlet of the circulating pump is connected with the feeding port of the evaporation heating chamber, the discharging port is communicated with the tangential inlet of the countercurrent evaporation separation body through a connecting pipe, a communication partition plate is arranged in the countercurrent evaporation separation body in a vertical mode, so that the countercurrent evaporation separation body is divided into an original liquid area and a circulating evaporation liquid area, the original liquid inlet is located in the original liquid area, and the circulating liquid outlet is located in the circulating evaporation liquid area. The application has the effects of reducing the equipment cost and energy consumption, reducing the floor area, and improving the separation efficiency through precise flow channel control.

Description

Technical Field

[0001] This application relates to the technical field of evaporation separation equipment, and in particular to a countercurrent evaporation separation device. Background Technology

[0002] In industries such as chemical, food, and environmental protection, evaporation separation has always been a crucial material handling process. It is a commonly used process that uses heating to vaporize the solvent in the material, followed by condensation to achieve material concentration or solvent recovery. Its widespread application allows materials to be utilized more effectively through concentration or solvent recovery, providing key support for the production and development of numerous industries and occupying an indispensable position in the entire industrial system.

[0003] To achieve evaporation separation, various methods are commonly used in the industry. One common approach is to employ a single evaporation separation structure, where the raw liquid is first preheated in a preheating device before being fed into the evaporation system for processing. Some devices also attempt to integrate flash evaporation functionality, hoping to improve separation efficiency to some extent. Furthermore, to meet evaporation separation requirements, some devices adjust the structure and parameters of the evaporation unit according to different operating conditions and material characteristics, but overall, they still revolve around the traditional principles of evaporation and flash evaporation.

[0004] However, when using a single evaporation separation structure, the feed liquid needs to be preheated separately, which not only increases the equipment footprint but also results in higher energy consumption. Some devices that integrate flash evaporation function, due to a lack of precise flow channel control, make it difficult for the flash-evaporated feed liquid to participate in the circulating evaporation efficiently, thus significantly reducing the separation efficiency. Utility Model Content

[0005] To address the issues of high energy consumption due to the need for separate preheating of the feed solution and low separation efficiency due to a lack of precise flow channel control, this application aims to provide a countercurrent evaporation separation device. The technical solution adopted is as follows: It includes a countercurrent evaporation separation unit, a feed pump, a circulation pump, an evaporation heating chamber, and a surface condenser; The countercurrent evaporation separator body has a raw liquid inlet on its side that is connected to the outlet of the raw liquid pump, a circulating liquid outlet on its cone bottom side that is connected to the inlet of the circulating pump, a concentrated liquid outlet at the bottom, and a secondary vapor outlet at the top that is connected to the inlet of the surface condenser. The outlet of the circulating pump is connected to the inlet of the evaporation heating chamber, and the outlet of the evaporation heating chamber is connected to the tangential inlet of the countercurrent evaporation separation body through a connecting pipe. The countercurrent evaporation separator is provided with a vertically arranged connecting baffle, which divides the countercurrent evaporation separator into a raw liquid area and a circulating evaporator area. The raw liquid inlet is located in the raw liquid area, and the circulating liquid outlet is located in the circulating evaporator area.

[0006] By adopting the above technical solution, the device integrates the functions of raw liquid flash evaporation and evaporation separation into one unit, eliminating the need for additional preheating equipment, reducing equipment costs and energy consumption, and reducing the floor space required; it realizes a complete workflow of raw liquid transportation, flash evaporation, circulating heating, re-flash evaporation separation, secondary steam treatment and concentrated liquid discharge; the flow direction of raw liquid is controlled by the connecting baffle, and the circulating material enters the countercurrent evaporation separation body tangentially, improving evaporation efficiency and separation effect.

[0007] Optionally, the connecting partition includes at least two layers of partition units arranged at intervals, and an adjustable flow gap is formed between adjacent partition units by adjusting bolts.

[0008] By adopting the above technical solution, the functions of flash evaporation and evaporation separation of raw liquid are integrated into the same device, eliminating the need for additional preheating equipment, reducing equipment costs and energy consumption, and reducing the floor space; the flow area can be precisely controlled so that more than 90% of the raw liquid after flash evaporation participates in the circulation heating, thereby improving the overall evaporation efficiency.

[0009] Optionally, the connecting pipe is connected to the tangential inlet of the countercurrent evaporation separation body, and the tangential inlet is located in the upper region of the countercurrent evaporation separation body.

[0010] By adopting the above technical solution, connecting the connecting pipe to the tangential inlet in the upper region of the countercurrent evaporation separation body allows the circulating material to enter the countercurrent evaporation separation body tangentially, enhancing the mixing and disturbance of the material and airflow within the device, improving the flash evaporation separation effect, and further improving the overall evaporation efficiency.

[0011] Optionally, the outer wall of the shell of the countercurrent evaporation separation body is provided with radial reinforcing ribs, and the wall thickness of the shell is not less than 5mm.

[0012] By adopting the above technical solution, radial reinforcing ribs are set on the outer wall of the shell of the countercurrent evaporation separator, and the shell wall thickness is not less than 5mm. This can enhance the structural strength of the device, prevent instability and flattening under high negative pressure conditions, improve the operational stability and safety of the device, and extend the service life of the equipment.

[0013] Optionally, the circulating liquid outlet is located on the bottom side of the countercurrent evaporation separation body, and the cone angle of the bottom of the cone is 60°-80°.

[0014] By adopting the above technical solution, the circulating liquid outlet is set on the side of the cone bottom of the countercurrent evaporation separator, and the cone bottom angle is 60°-80°, which facilitates the discharge of the original liquid after flash evaporation and allows more than 90% of the original liquid after flash evaporation to smoothly enter the circulating pump to participate in the circulating heating, thereby improving the evaporation efficiency.

[0015] Optionally, the concentrate outlet is connected to an external pipeline via a drain valve.

[0016] By adopting the above technical solution, the concentrated liquid outlet of the device is connected to the external pipeline through the drain valve, which allows for flexible control of the concentrated liquid discharge. This facilitates continuous and stable material transportation in conjunction with the external pipeline, enabling the device to better adapt to different production needs and operating condition changes, and improving the overall operating efficiency and flexibility of the device.

[0017] Optionally, the secondary steam outlet is equipped with a filter screen to prevent solid particles from entering the surface condenser.

[0018] By adopting the above technical solution, a filter screen is installed at the secondary steam outlet to prevent solid particles from entering the surface condenser. The flash evaporation and evaporation separation functions of the raw liquid are integrated into the same device, eliminating the need for additional preheating equipment, reducing equipment costs and energy consumption, and reducing the floor space required. Through the connecting baffle, more than 90% of the flash-evaporated raw liquid participates in the circulating heating, and the tangential feeding of the circulating material enhances the separation effect and improves the overall evaporation efficiency. By setting radial reinforcing ribs on the outer wall of the countercurrent evaporation separator and controlling the shell wall thickness, instability and flattening problems under high negative pressure are avoided, extending the service life of the equipment and ensuring continuous production. It is suitable for various industrial scenarios that require efficient evaporation separation.

[0019] Optionally, the outlet of the evaporation heating chamber is equipped with a flow regulating valve to control the return flow of the circulating material.

[0020] By adopting the above technical solution, a flow regulating valve is configured at the bottom outlet of the evaporation heating chamber, which can control the return flow of circulating materials, accurately adjust the material circulation volume in the device, and improve the evaporation separation efficiency and the stability of device operation.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. This device integrates the functions of flash evaporation and evaporation separation of raw liquid into one unit, eliminating the need for additional preheating equipment, reducing equipment costs and energy consumption, and reducing the floor space required; it realizes a complete workflow of raw liquid transportation, flash evaporation, circulating heating, re-flash evaporation separation, secondary steam treatment and concentrated liquid discharge; the flow direction of raw liquid is controlled by a connecting baffle, and the circulating material enters the countercurrent evaporation separation body tangentially, improving evaporation efficiency and separation effect; 2. High evaporation efficiency: By setting up connecting baffles, the flow area of ​​the connecting baffles can be precisely controlled to ensure that the raw liquid after flash evaporation participates in the circulation heating efficiently. In addition, the tangential feeding of the circulating material enhances the separation effect and improves the overall evaporation efficiency. 3. Good operational stability: By setting radial reinforcing ribs on the outer wall of the countercurrent evaporation separator shell, increasing the shell wall thickness, and using corrosion-resistant alloy materials, instability and flattening problems under high negative pressure conditions are avoided, extending the service life of the equipment and ensuring continuous production. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall separation device; In the picture, 1. Countercurrent evaporation separation unit; 11. Raw liquid inlet; 12. Circulating liquid outlet; 13. Concentrated liquid outlet; 14. Secondary steam outlet; 2. Raw material pump; 3. Circulation pump; 4. Evaporation heating chamber; 41. Feed inlet; 42. Discharge outlet; 5. Surface condenser, 51. Inlet; 6. Connecting pipe. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 This application will be described in further detail below.

[0024] A countercurrent evaporation separation device, as described above Figure 1 The system includes a raw liquid pump 2, a countercurrent evaporation separation body 1, a circulating pump 3, an evaporation heating chamber 4, and a surface condenser 5. The raw liquid pump 2 is used to transport the raw liquid for evaporation and pump it into the countercurrent evaporation separation body 1. The countercurrent evaporation separation body 1 is the core component for realizing the flash evaporation and evaporation separation of the raw liquid. The countercurrent evaporation separation body 1 is equipped with a vertically arranged connecting baffle, which divides the countercurrent evaporation separation body 1 into a raw liquid area and a circulating evaporation liquid area. The raw liquid inlet 11 is located in the raw liquid area, and the circulating liquid outlet 12 is located in the circulating evaporation liquid area. The connecting baffle can precisely control the flow of the raw liquid and the circulating evaporation liquid. The circulating pump 3 pumps the flash-evaporated raw liquid 2 into the evaporation heating chamber 4 for heating. The evaporation heating chamber 4 heats the circulating material. The surface condenser 5 condenses the secondary vapor to recover the solvent. These components work together to realize the function of flash evaporation and evaporation separation of the raw liquid, improving the evaporation efficiency and operational stability.

[0025] Specifically, the raw material pump 2 is the power component for transporting the evaporated raw material. It can be a centrifugal pump, which has advantages such as simple structure, uniform flow, and stable operation, effectively transporting the evaporated raw material to the countercurrent evaporation separator 1. Alternatively, a screw pump can be used, which features strong self-priming capability, stable flow, and low pressure pulsation, making it equally suitable for transporting the evaporated raw material. The raw material pump 2 is connected to the raw material inlet 11 on the side of the countercurrent evaporation separator 1 via a pipeline. The pipeline connection is tight to ensure no leakage during raw material transport.

[0026] Furthermore, the connecting baffle comprises at least two layers of spaced-apart baffle units, with an adjustable flow gap between adjacent baffle units. The baffle units can be flat, and the material can be stainless steel, which has good corrosion resistance and strength, and can adapt to the complex operating conditions in the evaporation separation process. Titanium alloy baffle units can also be used, as titanium alloy has higher strength and better corrosion resistance, making it particularly suitable for handling highly corrosive evaporation feed solutions. By accurately calculating the flow area, it can be ensured that more than 90% of the feed solution enters the circulating pump 3 after flash evaporation. Moreover, the connecting baffles can also be arranged in a spiral shape, guiding the material to flow along a spiral path, which increases the residence time of the material in the countercurrent evaporation separation body 1, improving the flash evaporation and separation effect.

[0027] The connecting baffle also adopts another structural form, which can be composed of multiple corrugated baffle units. The corrugated design can further increase the flow path and residence time of the material, improving the flash evaporation and separation effect. The multiple corrugated baffle units also form an adjustable connecting flow gap. By adjusting the spacing and corrugation shape of the baffle units, the connecting flow area can be precisely controlled.

[0028] The corrugated connecting baffle design increases the flow complexity of materials within the countercurrent evaporation and separation unit 1, resulting in more thorough mixing of materials and airflow, further improving flash evaporation and separation efficiency. Simultaneously, the adjustable connecting flow gap ensures that most of the raw liquid enters the circulating pump 3 for recirculation and heating after flash evaporation, enhancing overall evaporation efficiency. Furthermore, this structure also strengthens the baffle to some extent, adapting to high negative pressure operating environments, further improving the performance and stability of the device, and meeting the evaporation and separation needs of various industrial scenarios.

[0029] Furthermore, the countercurrent evaporation separator 1 has a raw liquid inlet 11 on its side for receiving the evaporated raw liquid delivered by the raw liquid pump 2; a circulating liquid outlet 12 is provided on the side of the cone bottom, and the cone angle of the cone bottom is 60°-80°. This cone angle design facilitates the smooth outflow of the raw liquid after flash evaporation. The circulating liquid outlet 12 is connected to the inlet of the circulating pump 3; a concentrated liquid outlet 13 is provided at the bottom, and the concentrated liquid outlet 13 is connected to an external pipeline through a drain valve. The drain valve can be a ball valve, which has the advantages of rapid opening and closing and good sealing performance, and can effectively control the discharge of concentrated liquid; a secondary steam outlet 14 is provided at the top, and a filter screen is provided at the secondary steam outlet 14. The filter screen can be a metal filter screen, which can prevent solid particles from entering the surface condenser 5. The secondary steam outlet 14 is connected to the inlet 51 of the surface condenser 5.

[0030] Furthermore, the outer wall of the countercurrent evaporation separator 1 is provided with radial reinforcing ribs, and the wall thickness of the shell is not less than 5mm. The reinforcing ribs can enhance the strength of the shell and prevent instability and flattening under high negative pressure conditions. The shell can be made of corrosion-resistant alloy material to further improve the corrosion resistance of the countercurrent evaporation separator 1 and extend its service life.

[0031] Furthermore, the circulating pump 3 is used to pump the flash-evaporated raw liquid from the circulating liquid outlet 12 of the countercurrent evaporation separation body 1 into the evaporation heating chamber 4. The circulating pump 3 can be a multi-stage centrifugal pump, which can provide a higher head to meet the conveying requirements. Alternatively, a magnetic pump can be used, which has the advantage of being leak-free and can ensure the safety of the conveying process. The inlet of the circulating pump 3 is connected to the circulating liquid outlet 12, and the outlet is connected to the feed inlet 41 of the evaporation heating chamber 4. The connecting pipes 6 are well sealed to ensure smooth liquid conveying.

[0032] Furthermore, the evaporation heating chamber 4 is used to heat the circulating material. It can be a shell-and-tube heat exchanger, which has the advantages of compact structure and high heat transfer efficiency. Alternatively, it can be a plate heat exchanger, which features high heat transfer coefficient and small footprint.

[0033] The evaporation heating chamber 4 is equipped with a feed inlet 41 to receive the flash-evaporated raw liquid delivered by the circulating pump 3. A discharge outlet 42 is located at the bottom, connected to the tangential inlet of the countercurrent evaporation separation body 1 via a connecting pipe 6. The tangential inlet is located in the upper region of the countercurrent evaporation separation body 1. This tangential feeding method enhances airflow turbulence within the device, improving the flash separation effect. The discharge outlet 42 at the bottom of the evaporation heating chamber 4 is equipped with a flow regulating valve, which can be an electrically operated valve to precisely control the return flow rate of the circulating material according to actual operating conditions.

[0034] Furthermore, the surface condenser 5 is used to condense and recover solvent from the secondary steam. It can be a shell-and-tube condenser, which has advantages such as simple structure and convenient operation. Alternatively, it can be a plate condenser, which features high heat transfer efficiency and a small footprint. The surface condenser 5 is equipped with an inlet 51, connected to the secondary steam outlet 14 at the top of the countercurrent evaporation separation body 1, and recovers the solvent from the secondary steam through condensation.

[0035] Furthermore, the raw liquid is flashed into the countercurrent evaporation separation body 1 by the action of the raw liquid pump 2. Most of the raw liquid after flashing enters the evaporation heating chamber 4 for heating through the circulation pump 3. The heated circulating material enters the countercurrent evaporation separation body 1 tangentially through the connecting pipe 6 for flash separation again. The secondary vapor enters the surface condenser 5 for condensation and solvent recovery, and the concentrated liquid is discharged from the bottom.

[0036] This combination enables the functions of flash evaporation and evaporation separation of the raw liquid. The flow channel is precisely controlled by the connecting baffle, which improves the evaporation efficiency and separation effect. At the same time, the structural design of the countercurrent evaporation separation body 1 ensures stability under high negative pressure conditions.

[0037] The implementation principle of this embodiment is as follows: This embodiment achieves the function of flash evaporation and evaporation separation of raw liquid through the coordinated work of various components. The raw liquid pump 2 delivers the evaporated raw liquid to the countercurrent evaporation separation body 1. The connecting baffle precisely controls the flow of raw liquid and circulating liquid, enabling the flash-evaporated raw liquid to participate in the circulating heating efficiently, thereby improving the evaporation efficiency. The circulating material enters the countercurrent evaporation separation body 1 tangentially, enhancing the separation effect. The surface condenser 5 condenses and recovers the solvent from the secondary vapor, achieving effective resource utilization. The structural design of the countercurrent evaporation separation body 1, such as the use of reinforcing ribs and corrosion-resistant alloy materials, ensures the stability and durability of the device under high negative pressure conditions. It solves the problems of existing evaporation devices, such as single function, low raw liquid preheating efficiency, poor separation effect, and poor stability under high negative pressure conditions, making it suitable for various industrial scenarios requiring efficient evaporation separation.

[0038] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A countercurrent evaporation separation device, characterized in that, It includes a countercurrent evaporation separation body (1), a raw liquid pump (2), a circulation pump (3), an evaporation heating chamber (4), and a surface condenser (5); The countercurrent evaporation separation body (1) has a raw liquid inlet (11) connected to the outlet of the raw liquid pump (2) on its side. The countercurrent evaporation separation body (1) has a circulating liquid outlet (12) connected to the inlet of the circulating pump (3) on its cone bottom side. The bottom has a concentrated liquid outlet (13) and the top has a secondary steam outlet (14) connected to the inlet (51) of the surface condenser (5). The outlet of the circulating pump (3) is connected to the feed inlet (41) of the evaporation heating chamber (4), and the discharge outlet (42) of the evaporation heating chamber (4) is connected to the tangential inlet of the countercurrent evaporation separation body (1) through the connecting pipe (6). The countercurrent evaporation separation body (1) is provided with a vertically arranged connecting partition, which divides the countercurrent evaporation separation body (1) into a raw liquid area and a circulating evaporation liquid area. The raw liquid inlet (11) is located in the raw liquid area, and the circulating liquid outlet (12) is located in the circulating evaporation liquid area.

2. The countercurrent evaporation separation device according to claim 1, characterized in that, The connecting partition includes at least two layers of partition units arranged at intervals, and an adjustable flow gap is formed between adjacent partition units by adjusting bolts.

3. The countercurrent evaporation separation device according to claim 1, characterized in that, The connecting pipe (6) is connected to the tangential inlet of the countercurrent evaporation separation body (1), and the tangential inlet is located in the upper region of the countercurrent evaporation separation body (1).

4. The countercurrent evaporation separation device according to claim 1, characterized in that, The outer wall of the countercurrent evaporation separation body (1) is provided with radial reinforcing ribs, and the wall thickness of the shell is not less than 5mm.

5. The countercurrent evaporation separation device according to claim 1, characterized in that, The circulating liquid outlet (12) is located on the cone bottom side of the countercurrent evaporation separation body (1), and the cone angle of the cone bottom is 60°-80°.

6. The countercurrent evaporation separation device according to claim 1, characterized in that, The concentrate outlet (13) is connected to an external pipeline via a drain valve.

7. The countercurrent evaporation separation device according to claim 1, characterized in that, The secondary steam outlet (14) is equipped with a filter screen to prevent solid particles from entering the surface condenser (5).

8. The countercurrent evaporation separation device according to claim 1, characterized in that, The outlet (42) of the evaporation heating chamber (4) is equipped with a flow regulating valve to control the return flow of the circulating material.

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