Calcium formate MVR evaporation crystallization system

Abstract

The utility model discloses a kind of calcium formate MVR evaporation crystallization systems, including stock solution tank, crystallizer, heat exchanger, thickener and centrifuge, stock solution tank is connected with crystallizer by preheating component, for conveying preheated raw material liquid into crystallizer;Heat exchanger is connected with crystallizer by forced circulation pump, for circulating raw material liquid into heat exchanger after heating and then into crystallizer to carry out flash evaporation;Thickener is connected with crystallizer by discharge pump, centrifuge is connected with thickener, and crystal slurry solution produced by flash evaporation is crystallized in thickener, and crystallization enters centrifuge to separate, and centrifuge is connected with mother liquor tank, mother liquor tank is connected with forced circulation pump by mother liquor pump, for conveying the mother liquor produced by separation to heat exchanger;Spraying assembly is provided in crystallizer;Effectively recycle system's heat to preheat raw material liquid, by low concentration slurry liquid continuous spray flush, eliminate the flaky crystalline salt generated in equipment inner wall, ensure that evaporation system continuously and stably operate.

Description

Technical Field

[0001] This utility model relates to the field of calcium formate crystallization technology, specifically a calcium formate MVR evaporation crystallization system. Background Technology

[0002] Evaporative crystallization of calcium formate (Ca(HCOO)2) is a commonly used industrial method for separating and purifying solid calcium formate products from their aqueous solutions. This process involves removing the solvent to supersaturate the solution, thereby promoting the precipitation of calcium formate crystals.

[0003] During the evaporation of calcium formate solution, flaky crystal salts easily adhere to the inner surface of the crystallizer. As the equipment vibrates during operation, the flaky crystal salts fall off and enter the forced circulation pump, causing the pump current to fluctuate and increase. Furthermore, after the flaky crystal salts enter the heat exchanger, they can easily cause blockage of the heat exchanger tubes, affecting the stable operation of the evaporation system. Therefore, this utility model proposes a calcium formate MVR evaporation crystallization system that can solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a calcium formate MVR evaporation crystallization system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a calcium formate MVR evaporation crystallization system, comprising a raw liquid tank, a crystallizer, a heat exchanger, a thickener, and a centrifuge, wherein the raw liquid tank is connected to the crystallizer via a preheating component for conveying the preheated raw material liquid into the crystallizer;

[0006] The heat exchanger is connected to the crystallizer via a forced circulation pump, which is used to circulate and transport the raw material liquid into the heat exchanger for heating before it enters the crystallizer for flash evaporation.

[0007] The thickener is connected to the crystallizer via a discharge pump, and the centrifuge is connected to the thickener. The crystal slurry generated by flash evaporation is crystallized in the thickener, and the crystallized liquid enters the centrifuge for separation. The centrifuge is connected to a mother liquor tank, which is connected to the forced circulation pump via a mother liquor pump for conveying the separated mother liquor to the heat exchanger.

[0008] The crystallizer is equipped with a spray assembly, which includes a ring pipe. Multiple sets of rinsing nozzles are evenly distributed around the outer circumference of the ring pipe, and the multiple sets of rinsing nozzles face the inner wall of the crystallizer.

[0009] Preferably, the preheating assembly includes a condensate preheater, a non-condensable gas preheater, and a fresh steam preheater connected in sequence, wherein the condensate preheater is connected to the raw liquid tank via a feed pump.

[0010] Preferably, the crystallizer is connected to a separator, the separator is connected to a compressor, the compressor is connected to the heat exchanger, and the secondary steam generated by flash evaporation enters the separator for defoaming, and then enters the heat exchanger after being heated and pressurized by the compressor.

[0011] Preferably, the heat exchanger is connected to a condensate tank, the condensate tank is connected to the condensate preheater via a condensate pump, and the fresh steam preheater is connected to the condensate tank.

[0012] Preferably, the separator and compressor are connected to a liquid collection pump, which is used to transport the liquid generated by the separator and compressor to the condensate tank.

[0013] Preferably, the crystallizer is connected to the non-condensable gas preheater.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The system effectively recovers and utilizes the heat to preheat the raw material liquid, and continuously sprays and washes with low-concentration liquid to eliminate the flaky crystalline salts formed on the inner wall of the equipment, ensuring the continuous and stable operation of the evaporation system. Attached Figure Description

[0016] Fig. 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Fig. 2 This is a schematic diagram of the spray assembly structure of this utility model;

[0018] In the diagram: 1. Raw material tank; 2. Feed pump; 3. Condensate preheater; 4. Non-condensable gas preheater; 5. Fresh steam preheater; 6. Condensate tank; 7. Condensate pump; 8. Crystallizer; 9. Forced circulation pump; 10. Heat exchanger; 11. Separator; 12. Compressor; 13. Accumulator pump; 14. Discharge pump; 15. Thickener; 16. Centrifuge; 17. Mother liquor tank; 18. Mother liquor pump; 19. Loop pipe; 20. Flushing nozzle. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figs. 1-2

[0021] Provides a calcium formate MVR evaporation crystallization system:

[0022] The raw material tank 1, crystallizer 8, heat exchanger 10, thickener 15 and centrifuge 16 are provided. The raw material tank 1 is connected to the crystallizer 8 through a preheating component and is used to transport the preheated raw material liquid into the crystallizer 8.

[0023] Heat exchanger 10 is connected to crystallizer 8 via forced circulation pump 9, which is used to circulate and transport raw material liquid into heat exchanger 10 for heating and then into crystallizer 8 for flash evaporation.

[0024] After the raw material liquid enters the crystallizer 8, it is heated in the heat exchanger 10 under the action of the forced circulation pump 9, and then flash vapor-liquid separation occurs in the crystallizer 8.

[0025] The preheating assembly includes a condensate preheater 3, a non-condensable gas preheater 4, and a fresh steam preheater 5 connected in sequence. The condensate preheater 3 is connected to the raw liquid tank 1 via a feed pump 2. The crystallizer 8 is connected to a separator 11, and the separator 11 is connected to a compressor 12. The compressor 12 is connected to a heat exchanger 10. The secondary steam generated by flash evaporation enters the separator 11 for defoaming and is then heated and pressurized by the compressor 12 before entering the heat exchanger 10. The heat exchanger 10 is connected to a condensate tank 6, and the condensate tank 6 is connected to the condensate preheater 3 via a condensate pump 7. The fresh steam preheater 5 is also connected to the condensate tank 6.

[0026] The separator 11 and the compressor 12 are connected to a liquid collection pump 13, which is used to transport the liquid generated by the separator 11 and the compressor 12 to the condensate tank 6.

[0027] Fresh steam preheats the raw material liquid in the fresh steam heater, and the resulting condensate enters the condensate tank 6. After being heated and pressurized, secondary steam heats the preheated raw material liquid in the heat exchanger 10, and the resulting condensate enters the condensate tank 6. The liquid collection pump 13 pumps the liquid collected by the separator 11 and the compressor 12 to the condensate tank 6, so that the condensate tank 6 delivers condensate to the condensate preheater 3 through the condensate pump 7 to preheat the raw material liquid.

[0028] The crystallizer 8 is connected to the non-condensable gas preheater 4. The non-condensable gas generated by the crystallizer 8 enters the non-condensable gas preheater 4 to preheat the raw material liquid, effectively recovering and utilizing the heat of the system to preheat the raw material liquid.

[0029] Thickener 15 is connected to crystallizer 8 via discharge pump 14, and centrifuge 16 is connected to thickener 15. The crystal slurry generated by flash evaporation is crystallized in thickener 15, and the crystallized liquid enters centrifuge 16 for separation. Centrifuge 16 is connected to mother liquor tank 17, and mother liquor tank 17 is connected to forced circulation pump 9 via mother liquor pump 18, which is used to transport the separated mother liquor to heat exchanger 10.

[0030] The mother liquor separated by centrifuge 16 is reintroduced into the system via mother liquor pump 18 to achieve the cyclic evaporation and crystallization of the raw material liquid.

[0031] The crystallizer 8 is equipped with a spray assembly, which includes a ring pipe 19. Multiple sets of rinsing nozzles 20 are evenly distributed around the outer circumference of the ring pipe 19. The multiple sets of rinsing nozzles 20 face the inner wall of the crystallizer 8 and continuously spray and rinse with low-concentration liquid to eliminate the flaky crystalline salts generated on the inner wall of the equipment, ensuring the continuous and stable operation of the evaporation system.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A calcium formate MVR evaporation crystallization system, characterized in that, It includes a raw liquid tank (1), a crystallizer (8), a heat exchanger (10), a thickener (15) and a centrifuge (16). The raw liquid tank (1) is connected to the crystallizer (8) through a preheating component and is used to transport the preheated raw liquid into the crystallizer (8). The heat exchanger (10) is connected to the crystallizer (8) via a forced circulation pump (9) for circulating and transporting the raw material liquid into the heat exchanger (10) for heating before entering the crystallizer (8) for flash evaporation. The thickener (15) is connected to the crystallizer (8) via a discharge pump (14), and the centrifuge (16) is connected to the thickener (15). The crystal slurry generated by flash evaporation is crystallized in the thickener (15), and the crystals enter the centrifuge (16) for separation. The centrifuge (16) is connected to a mother liquor tank (17), and the mother liquor tank (17) is connected to the forced circulation pump (9) via a mother liquor pump (18) for conveying the separated mother liquor to the heat exchanger (10). The crystallizer (8) is provided with a spray assembly, which includes a ring pipe (19). Multiple sets of rinsing nozzles (20) are evenly distributed around the outer circumference of the ring pipe (19), and the multiple sets of rinsing nozzles (20) face the inner wall of the crystallizer (8).

2. The calcium formate MVR evaporation crystallization system according to claim 1, characterized in that, The preheating assembly includes a condensate preheater (3), a non-condensable gas preheater (4), and a fresh steam preheater (5) connected in sequence. The condensate preheater (3) is connected to the raw liquid tank (1) via a feed pump (2).

3. The calcium formate MVR evaporation crystallization system according to claim 2, characterized in that, The crystallizer (8) is connected to a separator (11), the separator (11) is connected to a compressor (12), the compressor (12) is connected to the heat exchanger (10), the secondary steam generated by flash evaporation enters the separator (11) for defoaming, and enters the heat exchanger (10) after being heated and pressurized by the compressor (12).

4. The calcium formate MVR evaporation crystallization system according to claim 3, characterized in that, The heat exchanger (10) is connected to a condensate tank (6), which is connected to the condensate preheater (3) via a condensate pump (7), and the fresh steam preheater (5) is connected to the condensate tank (6).

5. The calcium formate MVR evaporation crystallization system according to claim 4, characterized in that, The separator (11) and compressor (12) are connected to a liquid collection pump (13), which is used to transport the liquid generated by the separator (11) and compressor (12) to the condensate tank (6).

6. The calcium formate MVR evaporation crystallization system according to claim 3, characterized in that, The crystallizer (8) is connected to the non-condensable gas preheater (4).

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