Multi-effect evaporation system

Abstract

The utility model belongs to the technical field of cooling systems, and particularly relates to a multi-effect evaporation system which comprises a plurality of effect evaporators, a main condenser and an auxiliary condenser which are sequentially connected, the effect evaporator close to the main condenser is connected with the middle of the main condenser through a secondary steam pipeline, and a first gas-liquid separator is arranged on the lower portion of the main condenser. A second gas-liquid separator is arranged on the lower portion of the vacuum heat exchanger, the top of the second gas-liquid separator is connected with the vacuum pump, the top of the vacuum pump is connected with a drainage tank, the bottom of the drainage tank is connected with a condenser, the condenser is connected with the top of the vacuum heat exchanger, and the top of the vacuum heat exchanger is connected with the drainage tank. The bottom of the first gas-liquid separator is connected with a condensate water tank. The heat exchange efficiency is improved, heat waste is reduced, and the heat utilization rate is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of evaporators, and in particular relates to a multi-effect evaporation system. Background Art

[0002] The condensation system plays a crucial role in the multi-effect evaporation process. Its main function is to exchange heat with the material through the cooling medium, maintain the system's vacuum, and discharge the evaporated water. The condenser, a key component, is responsible for condensing the secondary steam generated by the previous effect, thereby completing the heat exchange and circulation. Through this function of the condensation system, the multi-effect evaporator can achieve efficient heat utilization and energy saving. This process not only helps reduce energy consumption, but also improves the efficiency of the entire multi-effect evaporation system. Therefore, the condensation system plays an indispensable role in multi-effect evaporation, ensuring the smooth progress and efficient utilization of the multi-effect evaporation process. It is widely used in chemical, metallurgical, coal, pharmaceutical, food and other fields.

[0003] However, in existing multi-effect evaporation systems, the condenser used discharges the secondary steam from the last effect after cooling it, resulting in waste of both the cooling medium and the secondary steam after subsequent condensation. This leads to increased energy consumption and investment costs, as well as problems such as low efficiency, uneven heat exchange, and energy waste. 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 evaporation system to improve the cooling effect during the multi-effect evaporation process and to achieve full utilization of heat.

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

[0006] The multi-effect evaporation system described in the utility model includes several effect evaporators, a main condenser and a sub-condenser connected in sequence. The effect evaporator close to the main condenser is connected to the middle part of the main condenser through a secondary steam pipe. A gas-liquid separator 1 is provided at the lower part of the main condenser. The top of the gas-liquid separator 1 is connected to a vacuum pump and the upper part of a vacuum heat exchanger. A gas-liquid separator 2 is provided at the lower part of the vacuum heat exchanger. The top of the gas-liquid separator 2 is connected to the vacuum pump. The top of the vacuum pump is connected to a drainage tank. The bottom of the drainage tank is connected to the condenser. The condenser is connected to the top of the vacuum heat exchanger. The top of the vacuum heat exchanger is connected to the drainage tank. The bottom of the gas-liquid separator 1 is connected to a condensed water tank.

[0007] in:

[0008] The number of the effect evaporators is 3-12.

[0009] The bottom of the main condenser is provided with a condensed water inlet, the top of the main condenser is provided with a condensed water outlet, the lower part of the main condenser is connected to the lower part of the auxiliary condenser, and the top of the auxiliary condenser is provided with a mother liquid inlet and a mother liquid outlet.

[0010] An exhaust pipe is provided on the upper portion of the auxiliary condenser.

[0011] A Roots pump is provided on the pipeline between the second top of the gas-liquid separator and the vacuum pump.

[0012] A non-condensable gas pipeline is provided on the pipeline between the gas-liquid separator 1 and the vacuum heat exchanger.

[0013] The bottom of the condensate tank is connected to a condensate pump, and the top of the condensate tank is provided with a steam pipe.

[0014] A separation box is provided on the top of the vacuum pump, and the separation box is connected to the drainage tank through a pipeline.

[0015] The vacuum pump is connected to the outlet of the condenser, and a Y-type filter is arranged on the pipeline between the vacuum pump and the condenser.

[0016] A circulation pump is provided on the pipeline between the bottom of the drainage tank and the condenser.

[0017] The beneficial effects of the utility model are:

[0018] The utility model sets the main condenser and the auxiliary condenser in combination to achieve cooling of secondary steam and heating of production mother liquor, thereby improving the efficiency of heat exchange and increasing the evaporation efficiency of several effect evaporators; the heat exchange of vacuum non-condensable gas can be achieved through the vacuum heat exchanger, and the non-condensable gas discharged from several effect evaporators is uniformly compressed and then transported to the drainage tank, which can facilitate the subsequent use of water in the drainage tank in other production processes, and the steam in the condensed water tank can also be reused for evaporation in the multi-effect evaporation system, thereby improving heat exchange efficiency, reducing heat waste and improving heat utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] In the figure: 1. Main condenser; 2. Auxiliary condenser; 3. Vacuum heat exchanger; 4. Drain tank; 5. Condensate tank; 6. Secondary steam pipeline; 7. Vacuum pump; 8. Non-condensable gas pipeline; 9. Effect evaporator;

[0021] 101. Gas-liquid separator 1; 102. Condensate inlet; 103. Condensate outlet; 201. Mother liquor inlet; 202. Mother liquor outlet; 203. Exhaust pipe; 301. Condenser; 302. Gas-liquid separator 2; 303. Roots pump; 401. Circulation pump; 501. Condensate pump; 502. Steam pipe; 701. Separation box; 702. Y-type filter. DETAILED DESCRIPTION

[0022] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0023] Example 1

[0024] like Figure 1 As shown, the multi-effect evaporation system described in the utility model includes several effect evaporators 9, a main condenser 1 and a sub-condenser 2 connected in sequence. The effect evaporator 9 close to the main condenser 1 is connected to the middle part of the main condenser 1 through a secondary steam pipe 6. A gas-liquid separator 101 is provided at the lower part of the main condenser 1. The top of the gas-liquid separator 101 is connected to the vacuum pump 7 and the upper part of the vacuum heat exchanger 3. A gas-liquid separator 2 302 is provided at the lower part of the vacuum heat exchanger 3. The top of the gas-liquid separator 2 302 is connected to the vacuum pump 7. The top of the vacuum pump 7 is connected to the drain tank 4. The bottom of the drain tank 4 is connected to the condenser 301. The condenser 301 is connected to the top of the vacuum heat exchanger 3. The top of the vacuum heat exchanger 3 is connected to the drain tank 4. The bottom of the gas-liquid separator 101 is connected to the condensed water tank 5.

[0025] The main condenser 1 and the auxiliary condenser 2 are used together to cool the secondary steam and heat the production mother liquor; the vacuum heat exchanger 3 can realize the heat exchange of vacuum non-condensable gas, and uniformly compress the non-condensable gas discharged from several effect evaporators and then transport it to the drainage tank 4.

[0026] The number of the effect evaporators 9 is 3-12.

[0027] A condensate inlet 102 is provided at the bottom of the main condenser 1, a condensate outlet 103 is provided at the top of the main condenser 1, the lower part of the main condenser 1 is connected to the lower part of the auxiliary condenser 2, and a mother liquid inlet 201 and a mother liquid outlet 202 are provided at the top of the auxiliary condenser 2.

[0028] An exhaust pipe 203 is provided on the upper portion of the secondary condenser 2. The gas discharged from the exhaust pipe 203 can be used for heat exchange.

[0029] A Roots pump 303 is provided on the pipeline between the top of the second gas-liquid separator 302 and the vacuum pump 7 .

[0030] A non-condensable gas pipeline 8 is provided on the pipeline between the gas-liquid separator 101 and the vacuum heat exchanger 3. The non-condensable gas pipeline 8 can transport the non-condensable gas in other evaporative condensers to the vacuum heat exchanger.

[0031] The bottom of the condensed water tank 5 is connected to a condensed water pump 501, and the top of the condensed water tank 5 is provided with a steam pipe 502. The steam pipe 502 can transport the steam back to the several effect evaporators 9 for reuse.

[0032] A separation box 701 is provided on the top of the vacuum pump 7, and the separation box 701 is connected to the drainage tank 4 through a pipeline. The separation box 701 can separate the steam in the vacuum pump and transport the liquid to the drainage tank 4.

[0033] The vacuum pump 7 is connected to the outlet of the condenser 301 , and a Y-type filter 702 is provided on the pipeline between the vacuum pump 7 and the condenser 301 .

[0034] A circulation pump 401 is provided on the pipeline between the bottom of the drainage tank 4 and the condenser 301 .

[0035] Working principle and process:

[0036] During the multi-effect evaporation process, the secondary steam in the effect evaporator 9 close to the main condenser 1 enters the main condenser 1 for heat exchange, and the heat medium at the bottom of the main condenser 1 enters the sub-condenser 2 to heat the production mother liquor. After the secondary steam is condensed, the gas and liquid are separated in the gas-liquid separator 101, and the gas enters the vacuum heat exchanger 3 for heat exchange, and then enters the drainage tank 4 after being compressed by the Roots pump 303 and the vacuum pump 7. The water in the drainage tank 4 can enter the vacuum heat exchanger 3 for treatment, and finally discharged back to the drainage tank 4. After the water temperature in the drainage tank 4 reaches the appropriate temperature, it is transported to other processes for heat exchange, and the liquid enters the condensate tank 5. The steam in the condensate tank 5 is transported back to several effect evaporators for use, and the condensed water at the bottom can be used for separation.

Claims

1. A multi-effect evaporation system comprising a plurality of effect evaporators (9), a main condenser (1) and a secondary condenser (2) connected in sequence, characterized in that: The effect evaporator (9) near the main condenser (1) is connected to the middle of the main condenser (1) through the secondary steam pipe (6). The main condenser (1) is provided with a gas-liquid separator (101) at the lower part. The top of the gas-liquid separator (101) is connected to the vacuum pump (7) and the upper part of the vacuum heat exchanger (3). The vacuum heat exchanger (3) is provided with a gas-liquid separator (302) at the lower part. The top of the gas-liquid separator (302) is connected to the vacuum pump (7). The top of the vacuum pump (7) is connected to the drainage tank (4). The bottom of the drainage tank (4) is connected to the condenser (301). The condenser (301) is connected to the top of the vacuum heat exchanger (3). The top of the vacuum heat exchanger (3) is connected to the drainage tank (4). The bottom of the gas-liquid separator (101) is connected to the condensed water tank (5).

2. The multi-effect evaporation system according to claim 1, characterized in that: The number of effect evaporators (9) is 3-12.

3. The multi-effect evaporation system according to claim 1, characterized in that: A condensate inlet (102) is provided at the bottom of the main condenser (1), a condensate outlet (103) is provided at the top of the main condenser (1), the lower part of the main condenser (1) is connected to the lower part of the auxiliary condenser (2), and a mother liquid inlet (201) and a mother liquid outlet (202) are provided at the top of the auxiliary condenser (2).

4. The multi-effect evaporation system according to claim 1, characterized in that: An exhaust pipe (203) is provided on the upper portion of the auxiliary condenser (2).

5. The multi-effect evaporation system according to claim 1, characterized in that: A non-condensable gas pipeline (8) is provided on the pipeline between the gas-liquid separator 1 (101) and the vacuum heat exchanger (3).

6. The multi-effect evaporation system according to claim 1, characterized in that: A Roots pump (303) is provided on the pipeline between the top of the second gas-liquid separator (302) and the vacuum pump (7).

7. The multi-effect evaporation system according to claim 1, characterized in that: The bottom of the condensate tank (5) is connected to a condensate pump (501), and the top of the condensate tank (5) is provided with a steam pipe (502).

8. The multi-effect evaporation system according to claim 1, characterized in that: A separation box (701) is provided on the top of the vacuum pump (7), and the separation box (701) is connected to the drainage tank (4) through a pipeline.

9. The multi-effect evaporation system according to claim 1, characterized in that: The vacuum pump (7) is connected to the outlet of the condenser (301), and a Y-type filter (702) is provided on the pipeline between the vacuum pump (7) and the condenser (301).

10. The multi-effect evaporation system according to claim 1, characterized in that: A circulation pump (401) is provided on the pipeline between the bottom of the drainage tank (4) and the condenser (301).

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