Multi-effect falling film evaporation system

Abstract

The utility model belongs to the technical field of biological fermentation equipment, and particularly relates to a multi-effect falling film evaporation system which comprises a first falling film evaporation group and a second falling film evaporation group, the first falling film evaporation group and the second falling film evaporation group are connected in series, the first falling film evaporation group comprises a first-effect evaporator, the first-effect evaporator is connected with a second-effect evaporator, and the second-effect evaporator is connected with a third-effect evaporator. The second falling film evaporation group comprises a plurality of effect evaporators which are connected in parallel, the bottom of the triple-effect evaporator is connected with the top of the effect evaporator close to the triple-effect evaporator, a feeding pipeline is arranged on the triple-effect evaporator, and the triple-effect evaporator is connected with the MVR evaporator through a non-condensable gas pipeline; the non-condensable gas pipeline can be connected with a plurality of effect evaporators, and a discharging pipeline is arranged at the bottom of the first-effect evaporator. According to the utility model, the utilization efficiency of non-condensable gas is increased, repeated heating can be realized, the heat energy utilization rate of each-effect evaporator is favorably improved, and the efficiency of multi-effect falling film evaporation is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of biological fermentation equipment, and particularly relates to a multi-effect falling film evaporation system. Background Art

[0002] A falling film evaporator introduces liquid feed into the upper tube box of the falling film evaporator's heating chamber, where it forms a uniform film flowing downward through the liquid distribution system. During this process, the water in the feed is heated and vaporized by the heating medium in the shell side. The resulting steam and liquid enter the evaporator's separation chamber. After sufficient separation, the steam enters the condenser for condensation or serves as the heating medium for the next evaporator, achieving multi-effect evaporation. The liquid phase is discharged from the separation chamber. This operating method enables the falling film evaporator to excel in terms of heat transfer efficiency, evaporation rate, and material residence time, making it particularly suitable for processing heat-sensitive materials. However, the heating process requires a large amount of steam, and the used steam can easily be wasted.

[0003] In the current multi-effect falling film evaporation process, the heat energy of the evaporation process has not been effectively utilized, and as the number of effects increases, the evaporation effect gradually decreases and the evaporation efficiency decreases. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is: to provide a multi-effect falling film evaporation system, to reuse the non-condensable gas of the MVR evaporator in the multi-effect falling film evaporation process, and to use the exchange water to heat the multi-effect falling film evaporation system, thereby improving the thermal energy utilization rate and the efficiency of the multi-effect falling film evaporation.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The multi-effect falling film evaporation system described in the utility model comprises a first falling film evaporation group and a second falling film evaporation group, the first falling film evaporation group and the second falling film evaporation group are arranged in series, the first falling film evaporation group comprises a first-effect evaporator, the first-effect evaporator is connected to the second-effect evaporator, the second-effect evaporator is connected to the third-effect evaporator, the second falling film evaporation group comprises a plurality of effect evaporators connected in parallel, the bottom of the third-effect evaporator is connected to the top of the effect evaporator close to the third-effect evaporator, a feed pipeline is provided on the third-effect evaporator, the third-effect evaporator is connected to the MVR evaporator through a non-condensable gas pipeline, the non-condensable gas pipeline can be connected to a plurality of effect evaporators, and a discharge pipeline is provided at the bottom of the first-effect evaporator.

[0007] in:

[0008] The number of the effect evaporators is 1-9.

[0009] The non-condensable gas pipeline is respectively connected to the middle of the triple-effect evaporator and the middle of the multi-effect evaporator.

[0010] The first-effect evaporator, the second-effect evaporator, the third-effect evaporator and the first-effect evaporator are respectively connected to a first preheater, a second preheater, a third preheater and a fourth preheater.

[0011] The bottom of the three-effect evaporator is connected to the top of the effect evaporator through a pipeline, the bottom of the effect evaporator is connected to the bottom of the fourth preheater through a pipeline, the top of the fourth preheater is connected to the top of the third preheater, the bottom of the third preheater is connected to the bottom of the second preheater, the top of the second preheater is connected to the top of the second-effect evaporator, the bottom of the second-effect evaporator is connected to the bottom of the first preheater through a pipeline, and the top of the first preheater is connected to the top of the first-effect evaporator; material pumps are provided on the pipelines.

[0012] The bottom of the first-effect evaporator is connected to a first-effect separation tank, the first-effect separation tank is connected to the middle of the second-effect evaporator, the bottom of the second-effect evaporator is connected to a second-effect separation tank, the second-effect separation tank is connected to the middle of the third-effect evaporator, the bottom of the third-effect evaporator is connected to a third-effect separation tank, and the third-effect separation tank is connected to the middle of the first-effect evaporator.

[0013] The second-effect evaporator, the third-effect evaporator and the first-effect evaporator are respectively connected to the main material preheater 1, the main material preheater 2 and the main material preheater 3, and the main material preheater 1, the main material preheater 2 and the main material preheater 3 are connected by pipelines.

[0014] The bottom of the second-effect evaporator is connected to the second bottom of the main material preheater.

[0015] The bottom of the main material preheater 3 is provided with a main material inlet pipeline, and the top of the main material preheater 1 is provided with a main material outlet pipeline.

[0016] The lower part of the first-effect evaporator is provided with a water inlet pipeline, the lower part of the first-effect evaporator is connected to the lower part of the second-effect evaporator through a pipeline, the lower part of the second-effect evaporator is connected to the lower part of the third-effect evaporator through a pipeline, and the lower part of the third-effect evaporator is connected to the lower part of the first-effect evaporator through a pipeline, and a condensate pump is provided on each pipeline. The lower part of the first-effect evaporator is connected to a condensate pipeline, and a condensate pump is provided on the condensate pipeline.

[0017] The main material is the mother liquor material produced during the production process.

[0018] The beneficial effects of the utility model are:

[0019] The utility model increases the utilization efficiency of non-condensable gas by re-transporting the non-condensable gas of the MVR evaporator to the falling film evaporator, effectively controlling the temperature during the falling film evaporation process; setting up several effect evaporators can improve the effect of falling film evaporation, improve evaporation efficiency, and increase product concentration;

[0020] Making full use of steam during the evaporation process can reduce heat waste; setting up hot water and non-condensable gas to exchange heat with the multi-effect evaporation system at the same time can achieve multiple heating, which is beneficial to improving the thermal energy utilization rate of each effect evaporator and improving the efficiency of multi-effect falling film evaporation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] In the figure: 1. First-effect evaporator; 2. Second-effect evaporator; 3. Third-effect evaporator; 4. Third-effect evaporator; 5. MVR evaporator; 6. First preheater; 7. Main material preheater one; 8. Second preheater; 9. Main material preheater two; 10. Third preheater; 11. Main material preheater three; 12. Fourth preheater; 13. Non-condensable gas pipeline; 14. Discharge pipeline; 15. Main material inlet pipeline; 16. Feed pipeline; 17. Condensate pipeline; 18. Main material outlet pipeline; 19. Water inlet pipeline; 101. First-effect separation tank; 201. Second-effect separation tank; 301. Third-effect separation tank. DETAILED DESCRIPTION

[0023] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0024] Example 1

[0025] like Figure 1 As shown, the multi-effect falling film evaporation system described in the utility model includes a first falling film evaporation group and a second falling film evaporation group, the first falling film evaporation group and the second falling film evaporation group are arranged in series, the first falling film evaporation group includes a first-effect evaporator 1, the first-effect evaporator 1 is connected to a second-effect evaporator 2, the second-effect evaporator 2 is connected to a third-effect evaporator 3, the second falling film evaporation group includes several effect evaporators 4 connected in parallel, the bottom of the third-effect evaporator 3 is connected to the top of the effect evaporator 4 close to the third-effect evaporator 3, a feed pipeline 16 is provided on the third-effect evaporator 3, the third-effect evaporator 3 is connected to the MVR evaporator 5 through a non-condensable gas pipeline 13, the non-condensable gas pipeline 13 can be connected to several effect evaporators 4, and a discharge pipeline 14 is provided at the bottom of the first-effect evaporator 1.

[0026] The number of the effect evaporators 4 is 1-9.

[0027] The non-condensable gas pipeline 13 is connected to the middle of the triple-effect evaporator 3 and the middle of the multi-effect evaporator 4. The temperature of the non-condensable gas is 60-80°C, which can effectively exchange heat between the triple-effect evaporator 3 and the multi-effect evaporator 4, ensuring the temperature stability of the triple-effect evaporator 3 and the multi-effect evaporator 4.

[0028] The first-effect evaporator 1, the second-effect evaporator 2, the third-effect evaporator 3 and the first-effect evaporator 4 are respectively connected to the first preheater 6, the second preheater 8, the third preheater 10 and the fourth preheater 12, which can preheat the evaporation material and improve the effect of falling film evaporation.

[0029] The bottom of the triple-effect evaporator 3 is connected to the top of the first-effect evaporator 4 via a pipe. The bottom of the first-effect evaporator 4 is connected to the bottom of the fourth preheater 12 via a pipe. The top of the fourth preheater 12 is connected to the top of the third preheater 10. The bottom of the third preheater 10 is connected to the bottom of the second preheater 8. The top of the second preheater 8 is connected to the top of the second-effect evaporator 2. The bottom of the second-effect evaporator 2 is connected to the bottom of the first preheater 6 via a pipe. The top of the first preheater 6 is connected to the top of the first-effect evaporator 1. Material pumps are installed on each of the pipes. The material evaporated in the triple-effect evaporator 3 can be evaporated multiple times in several first-effect evaporators 4, and then evaporated in the second-effect evaporator 2 and the first-effect evaporator 1 to form the final concentrated material.

[0030] The bottom of the first-effect evaporator 1 is connected to a first-effect separation tank 101, which is connected to the middle of the second-effect evaporator 2. The bottom of the second-effect evaporator 2 is connected to a second-effect separation tank 201, which is connected to the middle of the third-effect evaporator 3. The bottom of the third-effect evaporator 3 is connected to a third-effect separation tank 301, which is connected to the middle of the first-effect evaporator 4. The secondary steam of each effect evaporator can be used for heat exchange in the next effect evaporator, thereby improving the utilization efficiency of the secondary steam.

[0031] The second-effect evaporator 2, the third-effect evaporator 3 and the effect evaporator 4 are respectively connected to the main material preheater 1 7, the main material preheater 2 9 and the main material preheater 3 11, and the main material preheater 1 7, the main material preheater 2 9 and the main material preheater 3 11 are connected by pipelines.

[0032] The bottom of the second-effect evaporator 2 is connected to the bottom of the main material preheater 2 9. After the material evaporated by the several-effect evaporator 4 enters the second-effect evaporator 2, part of the main material is separated from the bottom of the second-effect evaporator 2, and is uniformly heat-exchanged with other main materials and then transported to other processes for use.

[0033] A main material inlet pipeline 15 is provided at the bottom of the main material preheater 3 11, and a main material outlet pipeline 18 is provided at the top of the main material preheater 1 7.

[0034] A water inlet pipe 19 is provided at the lower portion of the first-effect evaporator 1. The lower portion of the first-effect evaporator 1 is connected to the lower portion of the second-effect evaporator 2 via a pipe. The lower portion of the second-effect evaporator 2 is connected to the lower portion of the third-effect evaporator 3 via a pipe. The lower portion of the third-effect evaporator 3 is connected to the lower portion of the first-effect evaporator 4 via a pipe. Condensate pumps are provided on each of the pipes. The lower portion of the first-effect evaporator 4 is connected to a condensate pipe 17, which is provided on a condensate pump. The heated water can be exchanged with the multi-effect evaporator, making full use of the heat in the heated water.

[0035] Working principle and process:

[0036] During falling film evaporation, the material is transported from the feed pipe 16 to the triple-effect evaporator 3, and then after falling film evaporation in the multiple-effect evaporators 4, it enters the second-effect evaporator 2 through the fourth preheater 12, the third preheater 10 and the second preheater 8, and then enters the first-effect evaporator 1 through the first preheater 6 for evaporation, and finally is discharged through the discharge pipe 14; during the material transportation process, the hot water after heat exchange in other evaporators is transported to the multi-effect evaporation system through the water inlet pipe 19, and the non-condensable gas discharged from the MVR evaporator is transported to the triple-effect evaporator 3 and the multiple-effect evaporators 4 through the non-condensable gas pipe 13. The secondary steam in each effect evaporator can be transported to the next effect evaporator for heat exchange. The main material can also be heated during the evaporation process. The main material after heat exchange can be used in other production processes, which greatly improves the heat utilization efficiency of the evaporation process.

Claims

1. A multi-effect falling film evaporation system, comprising a first falling film evaporation group and a second falling film evaporation group, characterized in that: The first falling film evaporation group and the second falling film evaporation group are arranged in series, the first falling film evaporation group includes a first-effect evaporator (1), the first-effect evaporator (1) is connected to a second-effect evaporator (2), the second-effect evaporator (2) is connected to a third-effect evaporator (3), the second falling film evaporation group includes a plurality of effect evaporators (4) connected in parallel, the bottom of the third-effect evaporator (3) is connected to the top of the effect evaporator (4) close to the third-effect evaporator (3), a feed pipeline (16) is provided on the third-effect evaporator (3), the third-effect evaporator (3) is connected to the MVR evaporator (5) through a non-condensable gas pipeline (13), the non-condensable gas pipeline (13) can be connected to a plurality of effect evaporators (4), and a discharge pipeline (14) is provided at the bottom of the first-effect evaporator (1).

2. The multi-effect falling film evaporation system according to claim 1, characterized in that: The number of effect evaporators (4) is 1-9.

3. The multi-effect falling film evaporation system according to claim 1, characterized in that: The non-condensable gas pipeline (13) is respectively connected to the middle of the triple-effect evaporator (3) and the middle of the multi-effect evaporator (4).

4. The multi-effect falling film evaporation system according to claim 1, characterized in that: The first-effect evaporator (1), the second-effect evaporator (2), the third-effect evaporator (3) and the first-effect evaporator (4) are respectively connected to a first preheater (6), a second preheater (8), a third preheater (10) and a fourth preheater (12).

5. The multi-effect falling film evaporation system according to claim 4, characterized in that: The bottom of the three-effect evaporator (3) is connected to the top of the effect evaporator (4) through a pipeline, the bottom of the effect evaporator (4) is connected to the bottom of the fourth preheater (12) through a pipeline, the top of the fourth preheater (12) is connected to the top of the third preheater (10), the bottom of the third preheater (10) is connected to the bottom of the second preheater (8), the top of the second preheater (8) is connected to the top of the second-effect evaporator (2), the bottom of the second-effect evaporator (2) is connected to the bottom of the first preheater (6) through a pipeline, and the top of the first preheater (6) is connected to the top of the first-effect evaporator (1); and material pumps are provided on the pipelines.

6. The multi-effect falling film evaporation system according to claim 1, characterized in that: The bottom of the first-effect evaporator (1) is connected to a first-effect separation tank (101), the first-effect separation tank (101) is connected to the middle of the second-effect evaporator (2), the bottom of the second-effect evaporator (2) is connected to a second-effect separation tank (201), the second-effect separation tank (201) is connected to the middle of the third-effect evaporator (3), the bottom of the third-effect evaporator (3) is connected to a third-effect separation tank (301), and the third-effect separation tank (301) is connected to the middle of the first-effect evaporator (4).

7. The multi-effect falling film evaporation system according to claim 1, characterized in that: The second-effect evaporator (2), the third-effect evaporator (3) and the third-effect evaporator (4) are respectively connected to the main material preheater 1 (7), the main material preheater 2 (9) and the main material preheater 3 (11), and the main material preheater 1 (7), the main material preheater 2 (9) and the main material preheater 3 (11) are connected through pipelines.

8. The multi-effect falling film evaporation system according to claim 7, characterized in that: The bottom of the second-effect evaporator (2) is connected to the bottom of the second main material preheater (9).

9. The multi-effect falling film evaporation system according to claim 1, characterized in that: A main material inlet pipeline (15) is provided at the bottom of the main material preheater 3 (11), and a main material outlet pipeline (18) is provided at the top of the main material preheater 1 (7).

10. The multi-effect falling film evaporation system according to claim 1, characterized in that: A water inlet pipe (19) is provided at the lower portion of the first-effect evaporator (1), the lower portion of the first-effect evaporator (1) is connected to the lower portion of the second-effect evaporator (2) through a pipe, the lower portion of the second-effect evaporator (2) is connected to the lower portion of the third-effect evaporator (3) through a pipe, the lower portion of the third-effect evaporator (3) is connected to the lower portion of the first-effect evaporator (4) through a pipe, and condensate pumps are provided on the pipes. The lower portion of the first-effect evaporator (4) is connected to a condensate pipe (17), and a condensate pump is provided on the condensate pipe (17).

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