Alkali liquor triple-effect evaporator

Abstract

The utility model relates to the technical field of alkali liquor treatment, in particular to an alkali liquor triple-effect evaporator, which comprises a first-effect evaporator, a second-effect evaporator and a triple-effect evaporator which are all connected with separators through solution outlet pipes. The separator is communicated with the next-stage evaporator through a solution inlet pipe and a steam pipe; condensate water outlet pipes are mounted on the first-effect evaporator, the second-effect evaporator and the third-effect evaporator; an opening and closing mechanism and a defoaming mechanism are mounted on the separator, the defoaming mechanism comprises a defoaming wire mesh and a mounting assembly, and the defoaming wire mesh is mounted in the separator through the mounting assembly. The device has the effects that the probability that the alkali liquor enters the separator to generate foam is reduced, and then the probability that secondary steam carries liquid drops to enter the next effect to pollute condensate water and reduce the concentration of the alkali liquor is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of alkaline solution treatment, and in particular to an alkaline solution triple-effect evaporator. Background Technology

[0002] The production process of rare earth chloride generates a large amount of alkaline wastewater, but its concentration is low. In the production process, a triple-effect evaporator is often used to concentrate and purify it, so that it can be reused.

[0003] The triple-effect energy-saving evaporator is a highly efficient and environmentally friendly evaporation device. Through optimized design and technological improvements, it achieves energy savings and increased efficiency. This type of evaporator has broad application prospects in industrial production, helping to reduce production costs and improve economic benefits.

[0004] The design of the triple-effect energy-saving evaporator takes into account the multiple uses of heat energy in the evaporation process. In the traditional single-effect evaporator, after the primary steam is used to heat the raw materials, the condensate and unused heat are usually discharged, resulting in energy waste. In the triple-effect system, the first evaporator (called the first effect) is heated by live steam, and the generated secondary steam is sent to the second evaporator (the second effect) as its heating source. Similarly, the secondary steam generated by the second effect is then used in the third evaporator (the third effect). By connecting the three evaporators in series, each unit of heat energy is utilized multiple times within the system, greatly improving the overall energy efficiency.

[0005] However, in the existing technology, when the alkaline solution enters the separator for gas-liquid separation, there is too much foam in the separation chamber, and the secondary steam carries liquid droplets into the next effect, which contaminates the condensate and reduces the concentration of the alkaline solution. Utility Model Content

[0006] In order to reduce the probability of alkaline solution generating foam in the separator, leading to condensate, this application provides an alkaline solution triple-effect evaporator.

[0007] This application provides a triple-effect alkaline evaporator, which adopts the following technical solution:

[0008] A triple-effect evaporator for alkaline solutions includes a first-effect evaporator, a second-effect evaporator, and a third-effect evaporator. Each of the first-effect, second-effect, and third-effect evaporators is connected to a separator via a solution outlet pipe. The separator is connected to the next-stage evaporator via a solution inlet pipe and a steam pipe. Each of the first-effect, second-effect, and third-effect evaporators is equipped with a condensate outlet pipe. The separator is equipped with an opening and closing mechanism and a defoaming mechanism. The defoaming mechanism includes a defoaming mesh and an installation assembly. The defoaming mesh is installed in the separator via the installation assembly.

[0009] By adopting the above technical solution, when gas carrying droplets passes through the wire mesh, the gas can easily bypass the wire mesh fibers due to its good fluidity. However, the droplets, due to their large inertia, cannot quickly change direction with the airflow, thus colliding with the surface of the wire mesh fibers and being captured. Although smaller droplets have less inertia, when their trajectory approaches the wire mesh fibers (the distance is less than the droplet radius), they will be directly intercepted and attached by the fibers. Therefore, the setting of the demister wire mesh reduces the probability of alkaline solution entering the separator and generating foam, thereby reducing the probability of secondary steam carrying droplets into the next effect, polluting the condensate, and reducing the concentration of alkaline solution.

[0010] Optionally, the mounting assembly includes a retaining ring fixedly connected to the separator, a lifting rod inserted into the demister mesh, a groove on the side wall of the lifting rod, and a limit rod rotatably connected in the groove.

[0011] By adopting the above technical solution, when installing the demister wire mesh, first pass the lifting rod through the demister wire mesh, then rotate the limiting rod out of the groove, and then manually place the demister wire mesh onto the fixing ring in the separator through the lifting rod; thus, the demister wire mesh can be detachably connected, and it is convenient to replace damaged or clogged demister wire mesh.

[0012] Optionally, the separator has an opening at the top, and the opening and closing mechanism includes an end cap and a control assembly, with the end cap mounted on the opening end of the separator via the control assembly.

[0013] By adopting the above technical solution, the top opening of the separator facilitates the installation and replacement of the demister screen, while the end cap ensures that the separator is in a closed state during normal operation.

[0014] Optionally, the control component includes a support rod fixedly connected to the separator, a mounting plate fixedly connected to the support rod, a motor fixedly connected to the mounting plate, a gear keyed to the output shaft of the motor, a connecting rod fixedly connected to the end cover, and a rack fixedly connected to the connecting rod, the rack meshing with the gear.

[0015] By adopting the above technical solution, since the separator is large in size, the end cap is also large in size, making it difficult to move the end cap manually. When the end cap is moved, the motor starts, the motor drives the gear to rotate, the gear drives the rack to slide, the rack drives the connecting rod to move, and the connecting rod drives the end cap to move.

[0016] Optionally, the separator is also equipped with a sealing mechanism, which includes a sealing gasket. The sealing gasket is fixedly connected to the end face of the end cap near the separator. A pressure block is also slidably connected to the separator via a power assembly.

[0017] By adopting the above technical solution, the sealing effect at the connection between the end cover and the separator is poor, which can easily cause steam to overflow. The setting of the sealing gasket achieves the sealing of the connection between the end cover and the separator, and the pressure block presses the end cover tightly through the power component, thereby reducing the probability that the end cover will be lifted due to excessive pressure in the separator.

[0018] Optionally, the power assembly includes an adjusting screw, which is rotatably connected to the support rod. A slider is slidably connected to the support rod, and the slider is fixedly connected to the pressure block. A screw nut is installed inside the slider, and the screw nut cooperates with the adjusting screw.

[0019] By adopting the above technical solution, when the pressure block is pressing the end cover, the adjusting screw is manually rotated. The adjusting screw drives the slider to slide through the screw nut. The slider drives the pressure block to move, thereby pressing the end cover.

[0020] Optionally, each of the steam pipes is equipped with a gas-gathering plate, and four air inlet pipes are fixedly connected to the gas-gathering plate. The ends of the four air inlet pipes away from the gas-gathering plate are connected to the first-effect evaporator and are evenly distributed along the circumference of the first-effect evaporator.

[0021] By adopting the above technical solution, the existing technology directly connects the steam pipe to the first-effect evaporator, second-effect evaporator, and third-effect evaporator, resulting in poor heating effect of steam on the side of the first-effect evaporator, second-effect evaporator, and third-effect evaporator away from the steam pipe, thereby reducing the evaporation efficiency; while the setting of the gas collecting plate realizes the uniform distribution of steam, and the steam enters the first-effect evaporator, second-effect evaporator, and third-effect evaporator evenly through four air inlet pipes, thereby uniformly heating the alkaline solution.

[0022] In summary, this application includes the following beneficial technical effects:

[0023] 1. When gas carrying droplets passes through the wire mesh, the gas easily bypasses the wire mesh fibers due to its good fluidity. However, the droplets, due to their greater inertia, cannot quickly change direction with the airflow, thus colliding with the surface of the wire mesh fibers and being captured. Smaller droplets, although having less inertia, will be directly intercepted and attached to the fibers when their trajectory approaches the wire mesh fibers (the distance is less than the droplet radius). The demister wire mesh reduces the probability of alkaline solution entering the separator and generating foam, thereby reducing the probability of secondary steam carrying droplets into the next effect, contaminating the condensate, and reducing the concentration of alkaline solution.

[0024] 2. Due to the large size of the separator, the end cap is also large, making it difficult to move the end cap manually. When the end cap is moved, the motor starts, drives the gear to rotate, the gear drives the rack to slide, the rack drives the connecting rod to move, and the connecting rod drives the end cap to move.

[0025] 3. When installing the demister wire mesh, first pass the lifting rod through the demister wire mesh, then rotate the limiting rod out of the groove. At this time, manually place the demister wire mesh onto the fixing ring in the separator through the lifting rod; thus, the demister wire mesh can be detached and connected, and it is convenient to replace damaged or clogged demister wire mesh.

[0026] 4. In the existing technology, the steam pipe is directly connected to the first-effect evaporator, the second-effect evaporator, and the third-effect evaporator, which results in poor heating effect of steam on the side of the first-effect evaporator, the second-effect evaporator, and the third-effect evaporator away from the steam pipe, thereby reducing the evaporation efficiency; while the setting of the gas collecting plate realizes the uniform distribution of steam, and enters the first-effect evaporator, the second-effect evaporator, and the third-effect evaporator evenly through four air inlet pipes, thereby uniformly heating the alkaline solution. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the alkaline triple-effect evaporator in the embodiments of this application;

[0028] Figure 2 This is a cross-sectional view of the separator in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the opening and closing mechanism in the embodiments of this application;

[0030] Figure 4 This is a schematic diagram of the sealing mechanism in the embodiments of this application;

[0031] Figure 5 This is a schematic diagram of the structure of the gas-gathering disc in the embodiments of this application.

[0032] Reference numerals: 11. Single-effect evaporator; 12. Double-effect evaporator; 13. Triple-effect evaporator; 14. Condensate outlet pipe; 2. Separator; 21. Steam pipe; 22. Solution inlet pipe; 23. Solution outlet pipe; 5. Defoaming mechanism; 51. Defoaming mesh; 52. Mounting assembly; 521. Fixing ring; 522. Lifting rod; 523. Limiting rod; 524. Groove; 6. Opening and closing mechanism; 61. End cap; 62. Control assembly; 621. Support rod; 622. Mounting plate; 623. Motor; 624. Gear; 625. Rack; 626. Connecting rod; 627. Slide groove; 7. Sealing mechanism; 71. Sealing gasket; 72. Pressure block; 73. Power assembly; 731. Adjusting screw; 732. Sliding block; 81. Gas collecting plate; 82. Inlet pipe. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0034] This application discloses an alkaline triple-effect evaporator.

[0035] refer to Figure 1 The alkaline triple-effect evaporator includes a first-effect evaporator 11, a second-effect evaporator 12, and a third-effect evaporator 13. Each of the first-effect evaporator 11, the second-effect evaporator 12, and the third-effect evaporator 13 is equipped with a condensate outlet pipe 14 for discharging cooled steam. Each of the first-effect evaporator 11, the second-effect evaporator 12, and the third-effect evaporator 13 is fixedly connected to a separator 2 via a solution outlet pipe 23. The separator 2 connected to the first-effect evaporator 11 is connected to the second-effect evaporator 12 via a solution inlet pipe 22 and a steam pipe 21. The separator 2 connected to the second-effect evaporator 12 is connected to the third-effect evaporator 13 via a solution inlet pipe 22 and a steam pipe 21.

[0036] When alkali solution is evaporated and concentrated, the alkali solution first enters the first-effect evaporator 11, and heating steam also enters the first-effect evaporator 11 to heat the alkali solution. After heating, the alkali solution enters the separator 2 through the solution outlet pipe 23 for separation. After separation, the steam in the alkali solution enters the second-effect evaporator 12 through the steam pipe 21. The alkali solution enters the second-effect evaporator 12 through the solution inlet pipe 22. After being heated again, the alkali solution enters the second separator 2 through the solution outlet pipe 23 for separation. After separation, the steam in the alkali solution enters the third-effect evaporator 13 through the steam pipe 21. The alkali solution enters the third-effect evaporator 13 through the solution inlet pipe 22. After being heated again, the alkali solution enters the third separator 2 through the solution outlet pipe 23 for separation. The concentration of the separated alkali solution is significantly concentrated.

[0037] refer to Figure 2 The separator 2 has an opening at the top and a defoaming mechanism 5 is installed on it. The defoaming mechanism 5 includes a defoaming mesh 51 and an installation assembly 52. ​​The installation assembly 52 includes a fixing ring 521, which is fixedly connected to the side wall inside the separator 2. The defoaming mesh 51 has a through groove, and a lifting rod 522 is inserted into the through groove. The side wall of the lifting rod 522 has a groove 524, and a limit rod 523 is rotatably connected in the groove 524.

[0038] The demister mesh 51 reduces the probability of alkaline solution entering the separator 2 and generating foam, thereby reducing the probability of secondary steam carrying droplets into the next stage, polluting the condensate, and reducing the concentration of alkaline solution. When installing the demister mesh 51, first pass the lifting rod 522 through the demister mesh 51, and then rotate the limiting rod 523 out of the groove 524. At this time, manually place the demister mesh 51 onto the fixing ring 521 in the separator 2 through the lifting rod 522. This achieves the detachable connection of the demister mesh 51 and facilitates the replacement of damaged or clogged demister mesh 51.

[0039] refer to Figure 3The separator 2 is also equipped with an opening and closing mechanism 6, which includes an end cover 61 and a control component 62. The end cover 61 is installed at the open end of the separator 2 through the control component 62. The control component 62 includes multiple support rods 621, which are all fixedly connected to the side wall of the separator 2. A mounting plate 622 is fixedly connected to the multiple support rods 621. A motor 623 is fixedly connected to the end face of the mounting plate 622 away from the separator 2. A gear 624 is keyed to the output shaft of the motor 623. A connecting rod 626 is fixedly connected to the end of the end cover 61 away from the separator 2. A rack 625 is fixedly connected to the side wall of the connecting rod 626. The rack 625 meshes with the gear 624.

[0040] The top opening of the separator 2 facilitates the installation and replacement of the demister screen 51. At the same time, the end cover 61 ensures that the separator 2 is closed during normal operation. Since the separator 2 is large, the end cover 61 is also large, making it difficult to move the end cover 61 manually. When the end cover 61 is moved, the motor 623 starts, drives the gear 624 to rotate, the gear 624 drives the rack 625 to slide, the rack 625 drives the connecting rod 626 to move, and the connecting rod 626 drives the end cover 61 to move.

[0041] refer to Figure 4 The separator 2 is also equipped with a sealing mechanism 7, which includes a sealing gasket 71. The sealing gasket 71 is fixedly connected to the end face of the end cover 61 near the separator 2. The separator 2 is also slidably connected to multiple pressure blocks 72 via a power assembly 73. The power assembly 73 includes multiple adjusting screws 731, which are rotatably connected to multiple support rods 621. Each of the support rods 621 has a sliding groove 627 on its side wall. Each of the sliding grooves 627 has a slider 732 slidably connected to it. The sliders 732 are fixedly connected to the pressure blocks 72. A screw nut is installed inside the slider 732, and the screw nut cooperates with the adjusting screw 731.

[0042] The sealing effect at the connection between the end cap 61 and the separator 2 is poor, which can easily cause steam to overflow. The sealing gasket 71 is set to seal the connection between the end cap 61 and the separator 2, and the pressure block 72 presses the end cap 61 tightly, thereby reducing the probability that the end cap 61 will be lifted due to excessive pressure in the separator 2. When the pressure block 72 presses the end cap 61, the adjusting screw 731 is manually rotated. The adjusting screw 731 drives the slider 732 to slide through the screw nut. The slider 732 drives the pressure block 72 to move, thereby pressing the end cap 61 tightly.

[0043] refer to Figure 5Each steam pipe 21 has a gas collecting plate 81 fixedly connected to the end away from the separator 2. For the first-effect evaporator 11, four air inlet pipes 82 are fixedly connected to the gas collecting plate 81. The ends of the four air inlet pipes 82 away from the gas collecting plate 81 are connected to the first-effect evaporator 11 and are evenly distributed along the circumference of the first-effect evaporator 11.

[0044] In the prior art, the steam pipe 21 is directly connected to the first-effect evaporator 11, the second-effect evaporator 12, and the third-effect evaporator 13, which results in poor heating effect of steam on the side of the first-effect evaporator 11, the second-effect evaporator 12, and the third-effect evaporator 13 away from the steam pipe 21, thereby reducing the evaporation efficiency; while the setting of the gas collecting plate 81 realizes the uniform distribution of steam, and enters the first-effect evaporator 11, the second-effect evaporator 12, and the third-effect evaporator 13 evenly through the four air inlet pipes 82, thereby uniformly heating the alkaline solution.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A triple-effect evaporator for alkaline solutions, comprising a first-effect evaporator (11), a second-effect evaporator (12), and a third-effect evaporator (13), wherein each of the first-effect evaporator (11), the second-effect evaporator (12), and the third-effect evaporator (13) is connected to a separator (2) via a solution outlet pipe (23), the separator (2) being connected to the next stage evaporator via a solution inlet pipe (22) and a steam pipe (21), and each of the first-effect evaporator (11), the second-effect evaporator (12), and the third-effect evaporator (13) is equipped with a condensate outlet pipe (14), characterized in that, The separator (2) is equipped with an opening and closing mechanism (6) and a defoaming mechanism (5). The defoaming mechanism (5) includes a defoaming wire mesh (51) and an installation assembly (52). The defoaming wire mesh (51) is installed in the separator (2) through the installation assembly (52).

2. The alkaline triple-effect evaporator according to claim 1, characterized in that, The installation assembly (52) includes a fixing ring (521) which is fixedly connected in the separator (2). A lifting rod (522) is inserted into the demister mesh (51). A groove (524) is provided on the side wall of the lifting rod (522), and a limit rod (523) is rotatably connected in the groove (524).

3. The alkaline triple-effect evaporator according to claim 2, characterized in that, The separator (2) has an opening at the top, and the opening and closing mechanism (6) includes an end cap (61) and a control component (62), wherein the end cap (61) is installed at the opening end of the separator (2) via the control component (62).

4. The alkaline triple-effect evaporator according to claim 3, characterized in that, The control component (62) includes a support rod (621) which is fixedly connected to the separator (2). A mounting plate (622) is fixedly connected to the support rod (621). A motor (623) is fixedly connected to the mounting plate (622). A gear (624) is keyed to the output shaft of the motor (623). A connecting rod (626) is fixedly connected to the end cover (61). A rack (625) is fixedly connected to the connecting rod (626). The rack (625) meshes with the gear (624).

5. The alkaline triple-effect evaporator according to claim 4, characterized in that, The separator (2) is also equipped with a sealing mechanism (7), which includes a sealing gasket (71). The sealing gasket (71) is fixedly connected to the end face of the end cap (61) near the separator (2). The separator (2) is also slidably connected to a pressure block (72) via a power assembly (73).

6. The alkaline triple-effect evaporator according to claim 5, characterized in that, The power assembly (73) includes an adjusting screw (731), which is rotatably connected to the support rod (621). A slider (732) is slidably connected to the support rod (621). The slider (732) is fixedly connected to the pressure block (72). A screw nut is installed inside the slider (732), and the screw nut cooperates with the adjusting screw (731).

7. The alkaline triple-effect evaporator according to claim 1, characterized in that, Each of the steam pipes (21) is equipped with a gas collecting plate (81), and four air inlet pipes (82) are fixedly connected to the gas collecting plate (81). The four air inlet pipes (82) are located at one end away from the gas collecting plate (81) and are in the first-effect evaporator (11), and are evenly distributed along the circumference of the first-effect evaporator (11).

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