Falling film series forced circulation evaporation crystallization integrated device
By integrating a falling film evaporator, a forced circulation component, and a crystallization component into a closed-loop system, the problem of high steam consumption in falling film evaporators is solved, enabling stepped utilization of thermal energy and improving system stability, while reducing energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU YUANTUO ENVIRONMENTAL TECH CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-07-07
AI Technical Summary
Existing falling film evaporators consume a large amount of steam in industrial applications and operate in an energy-intensive manner, resulting in high energy consumption.
An integrated falling film series forced circulation evaporation and crystallization device is adopted, which integrates the falling film evaporator, forced circulation component and crystallization component through the support component to form a closed circulation system. The steam generated by heating is used as an auxiliary heat source to realize the step utilization of heat energy and reduce steam consumption.
This design achieves a compact layout, reduces steam consumption, improves system stability, and reduces energy consumption through circulating heating and full utilization of steam.
Smart Images
Figure CN224462271U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of falling film evaporation, and in particular to an integrated device for falling film series forced circulation evaporation and crystallization. Background Technology
[0002] In many industrial sectors such as chemical engineering, pharmaceuticals, food processing, and environmental protection, the separation and concentration of materials are crucial unit operations. Among these, evaporation technology is widely used due to its high efficiency to remove solvents (usually water) from raw material liquids to obtain solutions or solid products with higher concentrations.
[0003] Among various evaporation devices, falling film evaporators are widely used due to their unique advantages. Their core principle is as follows: the feed liquid flows uniformly downwards in a thin film along the inner wall of the heating tubes through the top heat exchange tubes; under the action of the external heating medium (such as steam), the liquid film inside the tubes is heated, boils, and partially vaporizes; the generated steam usually flows in the same direction as the liquid film, which helps to lower the boiling point and enhance heat transfer; finally, the concentrated liquid is discharged from the bottom, and the secondary steam is drawn out from the top.
[0004] However, in actual industrial applications, steam consumption is a significant drawback. Evaporation is an energy-intensive process, and the large amount of latent heat required to drive water evaporation mainly relies on external steam. Even with high efficiency, falling film evaporators still consume a considerable amount of steam overall. Utility Model Content
[0005] To address the issue of high steam consumption, this application provides an integrated falling film series forced circulation evaporation and crystallization device.
[0006] The integrated falling film series forced circulation evaporation crystallization evaporation crystallization device provided in this application adopts the following technical solution:
[0007] An integrated falling film series forced circulation evaporation and crystallization device includes a support component, a falling film evaporator, a forced circulation component, and a crystallization component; the falling film evaporator, the forced circulation component, the crystallization component, and the connecting component are all connected to the support component; the crystallization component is connected to the forced circulation component through the connecting component, and the forced circulation component is connected to the falling film evaporator through the connecting component; the forced circulation component is used to circulate and heat the solution in the crystallization component, and transmits the steam generated by heating the solution into the falling film evaporator through the connecting component.
[0008] By adopting the above technical solution, the falling film evaporator, forced circulation component, and crystallization component are integrated into the support components, achieving a compact layout of the device and reducing the floor space. The forced circulation component is used to circulate and heat the solution in the crystallization component, and the steam generated by heating is transported to the falling film evaporator through the connecting pipe as an auxiliary heat source, realizing the step utilization of heat energy and reducing steam consumption. Each component forms a closed circulation system through the connecting pipe, preventing material leakage and improving system stability.
[0009] Preferably, the forced circulation assembly includes a separator, a circulation pump, and a heater, all of which are connected to a support assembly; the crystallization assembly is connected to the separator via a connecting assembly; the separator is connected to the circulation pump via the connecting assembly, the circulation pump is connected to the heater via the connecting assembly, and the heater is connected to the separator via the connecting assembly.
[0010] By adopting the above technical solution, the separator is used to separate gas and liquid, and the solution in the crystallization component is circulated and heated in the heater by a circulating pump; the high-temperature steam separated by the separator is sent into the falling film evaporator through the connecting pipe and is directly used for the evaporation of the raw material liquid, so as to realize the full utilization of steam.
[0011] Preferably, the crystallization assembly includes a mother liquor pump, a crystal slurry pump, a mother liquor tank, and a centrifuge. The mother liquor pump, crystal slurry pump, mother liquor tank, and centrifuge are all connected to a support assembly. The mother liquor tank is connected to the mother liquor pump via a connecting assembly. The mother liquor pump is connected to a separator via a connecting assembly. The separator is connected to the crystal slurry pump via a connecting assembly. The crystal slurry pump is connected to the centrifuge via a connecting assembly. The heater is used to heat the solution that is pumped from the separator by the circulating pump. The heated solution is then pumped into the separator via the connecting assembly. The crystal slurry pump pumps the crystal slurry from the separator into the centrifuge via the connecting assembly. The centrifuge is used to separate the crystals and the liquid.
[0012] By adopting the above technical solution, the mother liquor pump pumps the mother liquor from the mother liquor tank into the separator, the crystal slurry pump delivers the crystal slurry from the bottom of the separator to the centrifuge, and the crystals separated by the centrifuge are directly collected.
[0013] Preferably, the centrifuge is also connected to the mother liquor tank via a connecting assembly, and the centrifuge returns the separated solution to the mother liquor tank via the connecting assembly.
[0014] By adopting the above technical solution, the centrifuge and the mother liquor tank are connected by a connecting pipe, so that the separated mother liquor can be automatically returned to the mother liquor tank, realizing the recycling of mother liquor and reducing resource waste.
[0015] Preferably, an integrated device for falling film series forced circulation evaporation and crystallization further includes a preheater. The falling film evaporator is connected to a heater via a connecting assembly, and the heater is connected to the preheater via a connecting assembly. The raw material liquid enters from the preheater, which is used to preheat the raw material liquid.
[0016] By adopting the above technical solution, the preheater receives steam from the falling film evaporator through a heater, and uses the steam discharged from the falling film evaporator to preheat the raw material liquid, thereby reducing the initial heating energy consumption of the falling film evaporator.
[0017] Preferably, an air pump is also connected to the connection assembly between the falling film evaporator and the preheater.
[0018] By adopting the above technical solution, the air extraction pump is installed on the connecting pipe between the falling film evaporator and the preheater to actively extract steam and deliver it to the preheater, thereby accurately controlling the preheating steam flow rate.
[0019] Preferably, a falling film series forced circulation evaporation crystallization integrated device further includes a compressor. The falling film evaporator is connected to the compressor via a connecting assembly, and the compressor is connected to a heater via a connecting assembly. The compressor is used to compress and heat the steam transferred from the falling film evaporator to the compressor. The heater uses the heat from the steam transferred from the compressor to heat the solution.
[0020] By adopting the above technical solution, the compressor pressurizes and heats the steam generated by the falling film evaporator. The high-temperature steam is input into the heater through the connecting pipe. The heater then transports the heated steam to the separator through the connecting pipe. The steam in the separator is then returned to the falling film evaporator through the connecting pipe, forming an internal circulation heat system and realizing full utilization of steam.
[0021] Preferably, the falling film evaporator is also connected to a separator via a connecting assembly, and the concentrated liquid produced by the falling film evaporator is introduced into the separator via the connecting assembly, and the separator is used to further evaporate and concentrate the concentrated liquid.
[0022] By adopting the above technical solution, the steam generated by the evaporation and concentration of the separator is discharged into the falling film evaporator through a connecting pipe connected to the falling film evaporator, which is used to assist the falling film evaporator in concentrating the raw material liquid.
[0023] In summary, this application includes at least one of the following beneficial technical effects:
[0024] 1. By integrating the falling film evaporator, forced circulation component, and crystallization component into the support assembly, a compact layout of the device is achieved, reducing the floor space required. The forced circulation component is used to circulate and heat the solution in the crystallization component, and the steam generated by heating is transported to the falling film evaporator as an auxiliary heat source through the connecting pipe, realizing the step utilization of heat energy and reducing steam consumption. Each component forms a closed circulation system through the connecting pipe, preventing material leakage and improving system stability.
[0025] 2. The separator is used to separate gas and liquid. The solution in the crystallization module is circulated and heated in the heater by a circulating pump. The high-temperature steam separated by the separator is sent to the falling film evaporator through the connecting pipe and is directly used for the evaporation of the raw material liquid, so as to make full use of the steam. Attached Figure Description
[0026] Figure 1 This is a schematic diagram illustrating the overall structure in the embodiments of this application.
[0027] Figure 2 This is a schematic diagram illustrating a partial structure in the embodiments of this application.
[0028] Figure 3 This is a schematic diagram illustrating the structure of the forced loop component in the embodiments of this application.
[0029] Figure 4 This is a schematic diagram illustrating the connection relationship between the crystallization component and the forced circulation component in the embodiments of this application.
[0030] Figure 5 This is a schematic diagram illustrating the structure of the crystallization component in the embodiments of this application.
[0031] Explanation of reference numerals in the attached drawings: 1. Support assembly; 11. Base plate; 2. Preheater; 3. Falling film evaporator; 4. Compressor; 5. Forced circulation assembly; 51. Separator; 52. Circulation pump; 53. Heater; 6. Crystallization assembly; 61. Mother liquor pump; 62. Crystal slurry pump; 63. Mother liquor tank; 64. Centrifuge; 7. Connecting assembly; 71. Connecting pipe; 8. Vacuum pump. Detailed Implementation
[0032] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.
[0033] This application discloses an integrated device for falling film series forced circulation evaporation and crystallization, referring to... Figure 1The system includes a support assembly 1, a preheater 2, a falling film evaporator 3, a compressor 4, a forced circulation assembly 5, a crystallization assembly 6, and a connecting assembly 7. In this embodiment, the support assembly 1 includes a base plate 11. The preheater 2, the falling film evaporator 3, the compressor 4, the forced circulation assembly 5, and the crystallization assembly 6 are all connected to the base plate 11. The connecting assembly 7 includes connecting pipes 71. In this embodiment, multiple connecting pipes 71 are provided, and the preheater 2, the falling film evaporator 3, the compressor 4, the forced circulation assembly 5, and the crystallization assembly 6 are all interconnected through the connecting pipes 71.
[0034] Reference Figure 2 The preheater 2 is fixedly connected to the base plate 11. The falling film evaporator 3 is vertically arranged, with its lower end fixedly connected to the base plate 11 via a first support frame and located on one side of the preheater 2. The preheater 2 is connected to the falling film evaporator 3 via a connecting pipe 71. The raw material liquid enters from the preheater 2 and then enters the falling film evaporator 3 through the connecting pipe 71. The falling film evaporator 3 is equipped with heat exchange tubes (not shown in the figure) and a heating evaporation chamber (not shown in the figure). The raw material liquid entering the falling film evaporator 3 is evenly distributed into each heat exchange tube. Under the influence of gravity, vacuum induction, and airflow, the raw material liquid flows from top to bottom in a uniform film. During the flow, it is heated and vaporized in the heating evaporation chamber. The evaporation process of the raw material liquid in the falling film evaporator 3 is existing technology and will not be described in detail here.
[0035] Reference Figures 1-3 The forced circulation assembly 5 includes a heater 53, which is fixedly connected to the base plate 11. The falling film evaporator 3 is also connected to the heater 53 via a connecting pipe 71, and a vacuum pump 8 is fixedly installed on the connecting pipe 71 between the falling film evaporator 3 and the heater 53. Part of the steam generated by the falling film evaporator 3 is sent to the heater 53 for reheating via the vacuum pump 8. The heater 53 is connected to the preheater 2 via a connecting pipe 71, and part of the steam in the heater 53 enters the preheater 2 through the connecting pipe 71. The advantage of this design is that the steam generated by the falling film evaporator 3 is heated by the heater 53 before entering the preheater 2, thereby preheating the raw material liquid entering the preheater 2.
[0036] Reference Figure 2 The compressor 4 is located on one side of the falling film evaporator 3 and is fixedly connected to the base plate 11. The falling film evaporator 3 is also connected to the compressor 4 via a connecting pipe 71, and the compressor 4 is connected to the heater 53 via a connecting pipe 71. Another part of the steam generated by the falling film evaporator 3 enters the compressor 4, which compresses this part of the steam. After being pressurized and heated by the compressor 4, this part of the steam is transferred to the heater 53 via the connecting pipe 71. Subsequently, this part of the steam is sent back from the heater 53 to the falling film evaporator 3 by the forced circulation assembly 5.
[0037] Reference Figure 3The forced circulation assembly 5 also includes a separator 51 and a circulation pump 52. The separator 51 is vertically arranged, and its lower end is fixedly connected to the base plate 11 via a second support frame and is located on one side of the falling film evaporator 3. The circulation pump 52 is fixedly connected to the base plate 11 and is located on one side of the separator 51. The lower end of the separator 51 is connected to the circulation pump 52 via a connecting pipe 71. The circulation pump 52 is connected to the heater 53 via a connecting pipe 71. The heater 53 is also connected to the middle part of the separator 51 via a connecting pipe 71. The upper end of the separator 51 is also connected to the falling film evaporator 3 via a connecting pipe 71.
[0038] Reference Figures 4-5 The crystallization assembly 6 includes a mother liquor pump 61, a crystal slurry pump 62, a mother liquor tank 63, and a centrifuge 64. The mother liquor pump 61 is fixedly connected to the base plate 11 and is connected to the lower end of the separator 51 via a connecting pipe 71. The lower end of the crystal slurry pump 62 is connected to the base plate 11, and the lower end of the separator 51 is connected to the crystal slurry pump 62 via a connecting pipe 71. The lower end of the centrifuge 64 is connected to the base plate 11, and the crystal slurry pump 62 is connected to the centrifuge 64 via a connecting pipe 71. The lower end of the mother liquor tank 63 is fixedly connected to the base plate 11 via a third connecting bracket. The centrifuge 64 is also connected to the mother liquor tank 63 via a connecting pipe 71, and the mother liquor tank 63 is also connected to the mother liquor pump 61 via a connecting pipe 71.
[0039] Reference Figures 3-5 The mother liquor pump 61 transfers the solution from the mother liquor tank 63 to the separator 51, where gas and liquid are separated. During this separation process, the circulation pump 52 transfers the solution from inside the separator 51 to the heater 53 for heating. The heated solution is then returned to the separator 51. This continuous heating and circulation helps accelerate the crystallization of the solution. During the forced circulation assembly 5's heating and circulating of the solution, the steam temperature inside the separator 51 also continuously rises. All of these gases eventually enter the falling film evaporator 3 through the connecting pipe 71, which is connected to the upper end of the evaporator. The falling film evaporator 3 uses these heated gases to evaporate and concentrate the raw material liquid. After the solution is circulated and heated for a certain period of time, the circulation pump 52 stops working. Then, the crystal pump 62 transfers the solution in the separator 51 to the centrifuge 64. The centrifuge 64 is used to separate the liquid and crystals. The separated crystals are discharged from the centrifuge 64 for collection, while the separated liquid is returned to the mother liquor tank 63.
[0040] Reference Figure 3The lower end of the falling film evaporator 3 is also connected to the separator 51 through a connecting pipe 71. The concentrated liquid produced by the falling film evaporator 3 is discharged into the flash chamber (not shown in the figure) inside the separator 51 through a connecting pipe 71 at its lower end, so as to carry out evaporation and concentration again. The steam generated by the evaporation and concentration of the separator 51 is then discharged into the falling film evaporator 3 through a connecting pipe 71 at its upper end, which helps the falling film evaporator 3 to evaporate and concentrate the raw material liquid.
[0041] The implementation principle of the integrated falling film series forced circulation evaporation crystallization device in this application embodiment is as follows: The raw material liquid first enters the preheater 2 for preheating. The preheated raw material liquid enters the falling film evaporator 3, where it forms a liquid film that flows downwards in the internal heat exchange tubes and is heated and vaporized in the heating evaporation chamber. During the evaporation process of the raw material liquid, the falling film evaporator 3 produces concentrated liquid and steam. The steam generated by the falling film evaporator 3 is divided into two paths: one path is pumped into the heater 53 by the vacuum pump 8 for heating, and then enters the preheater 2 to preheat the raw material; the other path enters the compressor 4 for pressurization and heating, and the high-temperature steam after being pressurized and heated by the compressor 4 enters the heater 53. The concentrated liquid enters the separator 51 through the connecting pipe 71 for flash evaporation. The solution in the mother liquor pump 61 is forcibly circulated between the separator 51, the circulation pump 52, and the heater 53, continuously concentrating and crystallizing. The crystal slurry at the bottom of the separator 51 is sent to the centrifuge 64 by the crystal slurry pump 62. The centrifuge 64 is used to separate the crystals and the liquid, and the separated solution flows into the mother liquor tank 63 for temporary storage.
[0042] 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 falling film series forced circulation evaporation crystallization integrated device, characterized in that: It includes a support assembly (1), a falling film evaporator (3), a forced circulation assembly (5), and a crystallization assembly (6); the falling film evaporator (3), the forced circulation assembly (5), the crystallization assembly (6), and the connecting assembly (7) are all connected to the support assembly (1); The crystallization component (6) is connected to the forced circulation component (5) via the connecting component (7). The forced circulation component (5) is connected to the falling film evaporator (3) via the connecting component (7). The forced circulation component (5) is used to circulate and heat the solution in the crystallization component (6) and to transfer the steam generated by heating the solution into the falling film evaporator (3) via the connecting component (7).
2. The integrated falling film series forced circulation evaporation and crystallization device according to claim 1, characterized in that: The forced circulation assembly (5) includes a separator (51), a circulation pump (52) and a heater (53), all of which are connected to the support assembly (1). The crystallization component (6) is connected to the separator (51) via a connecting component (7); The separator (51) is connected to the circulation pump (52) via the connecting assembly (7), and the circulation pump (52) is connected to the heater (53) via the connecting assembly (7); the heater (53) is connected to the separator (51) via the connecting assembly (7).
3. The integrated falling film series forced circulation evaporation and crystallization device according to claim 2, characterized in that: The crystallization assembly (6) includes a mother liquor pump (61), a crystal slurry pump (62), a mother liquor tank (63), and a centrifuge (64). The mother liquor pump (61), crystal slurry pump (62), mother liquor tank (63), and centrifuge (64) are all connected to the support assembly (1). The mother liquor tank (63) is connected to the mother liquor pump (61) through a connecting assembly (7). The mother liquor pump (61) is connected to the separator (51) through the connecting assembly (7). The separator (51) is connected to the crystal slurry pump (62) through the connecting assembly (7). The crystal slurry pump (62) is connected to the centrifuge (64) through the connecting assembly (7). The heater (53) is used to heat the solution introduced from the separator (51) by the circulation pump (52). The heated solution is introduced into the separator (51) through the connecting assembly (7). The crystal slurry pump (62) introduces the crystal slurry in the separator (51) into the centrifuge (64) through the connecting assembly (7). The centrifuge (64) is used to separate the crystals and the liquid.
4. The integrated falling film series forced circulation evaporation and crystallization device according to claim 3, characterized in that: The centrifuge (64) is also connected to the mother liquor tank (63) via a connecting assembly (7), and the centrifuge (64) returns the separated solution back to the mother liquor tank (63) via the connecting assembly (7).
5. The integrated falling film series forced circulation evaporation and crystallization device according to claim 2, characterized in that: It also includes a preheater (2), and the falling film evaporator (3) is connected to the heater (53) via a connecting assembly (7), and the heater (53) is connected to the preheater (2) via the connecting assembly (7); The raw material liquid enters from the preheater (2), which is used to preheat the raw material liquid.
6. The integrated falling film series forced circulation evaporation and crystallization device according to claim 5, characterized in that: An air pump (8) is also connected to the connection assembly (7) between the falling film evaporator (3) and the preheater (2).
7. The integrated falling film series forced circulation evaporation and crystallization device according to claim 2, characterized in that: It also includes a compressor (4), the falling film evaporator (3) is connected to the compressor (4) via a connecting assembly (7), the compressor (4) is connected to a heater (53) via the connecting assembly (7), the compressor (4) is used to compress and heat the steam transferred from the falling film evaporator (3) to the compressor (4); the heater (53) uses the heat of the steam transferred from the compressor (4) to heat the solution.
8. The integrated falling film series forced circulation evaporation and crystallization device according to claim 2, characterized in that: The falling film evaporator (3) is also connected to the separator (51) via a connecting assembly (7). The concentrated liquid produced by the falling film evaporator (3) is transferred to the separator (51) via the connecting assembly (7). The separator (51) is used to further evaporate and concentrate the concentrated liquid.