Multi-effect evaporation and concentration system

Abstract

The utility model belongs to the field of chemical engineering, and discloses a multi-effect evaporation and concentration system, which comprises a deamination unit, an ammonia-containing material concentration unit, a taurine-containing material concentration unit, a gas-liquid separation unit and a steam recovery unit, and in the taurine-containing material concentration unit, the steam generated by the deamination unit is used as a heat source to concentrate the low-concentration taurine-containing material, and ammonia in the steam is completely condensed in the unit, so that the heat of the ammonia-containing steam can be recovered, the ammonia is also recovered as ammonia water, and the waste of the material is avoided. The multi-effect evaporation and concentration system disclosed by the utility model is simple in process flow, low in energy consumption, small in occupied area of equipment, capable of realizing full-automatic operation, and safer and more reliable.

Description

Technical Field

[0001] The utility model belongs to the chemical industry field, and more specifically, relates to a multi-effect evaporation and concentration system, and more specifically relates to a multi-effect evaporation and concentration system for taurine production. Background Art

[0002] Taurine, also known as 2-aminoethanesulfonic acid, is one of the essential amino acids for the human body. The existing preparation methods of taurine mainly include the ethylene oxide method. In the preparation process of this method, whether it is the separation and purification of intermediate materials or the refining of products, the concentration of materials is involved. At present, the concentration mostly adopts the traditional multi-effect evaporation or MVR evaporation method.

[0003] The traditional multi-effect evaporation process is to connect multiple evaporators in series, and the steam generated by the upper stage is used to heat the lower stage. However, the heat recovery rate of multi-effect evaporation is relatively low, and high-temperature steam needs to be supplied externally as a heat source, resulting in a large steam consumption cost and a high equipment cost.

[0004] MVR evaporation, namely mechanical vapor recompression evaporation process, is to compress the secondary steam generated in the evaporator and then return it to the evaporator as a steam heat source. In this way, not only the latent heat of the secondary steam is recovered, but also the introduction amount of external heat source is reduced, the energy consumption is reduced, and the production cost is reduced. For example, an amino acid solution MVR evaporation and concentration system disclosed in CN202223582034.5 adopts a parallel connection method of a two-effect falling film evaporator and a single-effect rising film evaporator to evaporate and concentrate the amino acid solution. When the amino acid concentration is low, the first-effect and second-effect evaporators are used for evaporation. After the amino acid concentration increases, the single-effect rising film evaporator is used for evaporation. Among them, the secondary steam generated by the second-effect falling film evaporator and the single-effect rising film evaporator enters the steam compressor, and after being heated again by the steam compressor, it enters the evaporator again as a heat source to evaporate and concentrate the material.

[0005] In the existing taurine production, after the ammonia-containing material is evaporated and concentrated, the ammonia in the generated secondary steam cannot be directly recovered by the above MVR technology, resulting in waste of this part of ammonia-containing steam. At the same time, although the material containing low-concentration taurine generated in the existing process can be recycled, the amount used is small, and most of the material containing low-concentration taurine is wasted. If this part of the low-concentration taurine material is further concentrated, the crude taurine can be separated and extracted by cooling and crystallization, greatly improving the utilization rate of the low-concentration taurine material.

[0006] Based on this, in order to avoid ammonia entering the compressor, make full use of the heat of the ammonia-containing steam, and improve the utilization rate of the material containing low-concentration taurine, the utility model proposes a multi-effect evaporation and concentration system. Summary of the Invention

[0007] In order to solve the deficiencies existing in the prior art, the purpose of the present utility model is to provide a multi-effect evaporation and concentration system. While concentrating ammonia-containing materials and low-concentration taurine-containing materials in the production of taurine, this system also realizes the heat recovery of ammonia-containing steam and the recovery of ammonia. The process flow is simple, the energy consumption is low, the floor area of the equipment is small, and it can achieve full-automatic operation, being safer and more reliable.

[0008] In order to achieve the above purpose, the present utility model provides a multi-effect evaporation and concentration system, which includes:

[0009] A deammoniation unit, which is respectively connected to the ammonia-containing material concentration unit and the taurine-containing material concentration unit, and is used for the primary evaporation and concentration deammoniation of ammonia-containing materials. The ammonia-containing steam generated during the primary evaporation and concentration deammoniation provides heat energy for the taurine-containing material concentration unit;

[0010] An ammonia-containing material concentration unit, which is connected to the gas-liquid separation unit and is used for the secondary evaporation and concentration of ammonia-containing materials;

[0011] A taurine-containing material concentration unit, which is connected to the gas-liquid separation unit and is used for the evaporation and concentration of taurine-containing materials;

[0012] A gas-liquid separation unit, which is connected to the steam recovery unit and is used for collecting the steam generated during the secondary evaporation and concentration of ammonia-containing materials and the evaporation and concentration of taurine-containing materials and removing foam;

[0013] A steam recovery unit, which is respectively connected to the deammoniation unit and the ammonia-containing material concentration unit, and is used for recovering and heating up the defoamed steam to provide heat energy for the deammoniation unit and the ammonia-containing material concentration unit.

[0014] Preferably, the multi-effect evaporation and concentration system further includes an automatic control unit for the automatic control of the multi-effect evaporation and concentration system.

[0015] Preferably, the multi-effect evaporation and concentration system further includes a condensate recovery unit. The condensate recovery unit is respectively connected to the deammoniation unit, the ammonia-containing material concentration unit and the steam recovery unit, and is used for collecting the condensate water in the deammoniation unit, the ammonia-containing material concentration unit and the steam recovery unit.

[0016] Preferably, the multi-effect evaporation and concentration system further includes a preheating unit. The preheating unit is respectively connected to the condensate recovery unit and the taurine-containing material concentration unit, and is used for preheating the taurine-containing materials.

[0017] Preferably, the preheating unit includes at least one plate heat exchanger.

[0018] Preferably, the multi-effect evaporation concentration system further includes an ammonia recovery unit, which is connected to the taurine-containing material concentration unit for recovering ammonia water.

[0019] Preferably, the deammoniation unit, the ammonia-containing material concentration unit, and the taurine-containing material concentration unit each include at least one falling film evaporator.

[0020] Preferably, the heat exchange area ratio of the deammoniation unit, the ammonia-containing material concentration unit, and the taurine-containing material concentration unit is 1:1 - 2:2 - 4. Preferably, the heat exchange area ratio of the deammoniation unit, the ammonia-containing material concentration unit, and the taurine-containing material concentration unit is 1:1 - 1.8:2 - 3.

[0021] Preferably, the gas-liquid separation unit includes at least one falling film separator and / or at least one scrubbing tower.

[0022] Preferably, the steam recovery unit includes at least one compressor. Preferably, the compressor is a centrifugal compressor.

[0023] Compared with the prior art, the present utility model has the following beneficial effects:

[0024] 1. The multi-effect evaporation concentration system disclosed by the present utility model not only has a simple process flow, low energy consumption, small equipment floor area, but also can achieve full-automatic operation, being safer and more reliable.

[0025] 2. During the operation of the present utility model, there is no need for an external high-temperature and high-pressure steam heat source. The secondary steam evaporated from the material can be recycled through the steam recovery unit to meet the heat source requirements during the evaporation and concentration process of the system. This not only saves the consumption of fresh steam and reduces production costs, but also greatly reduces the risk of equipment and heat exchange pipeline blockage due to the short evaporation process.

[0026] 3. In the present utility model, the deammoniation unit mainly completes the deammoniation and primary concentration of the ammonia-containing material in taurine production. The ammonia-containing material concentration unit mainly completes the secondary concentration of the ammonia-containing material. After concentration, the material does not require other treatment and can be directly sent to the downstream production device for treatment. The taurine-containing material concentration unit mainly completes the concentration of the low-concentration taurine-containing material and the recovery of the heat of the ammonia-containing steam. In this concentration unit, all the ammonia in the ammonia-containing steam is condensed during the heat exchange process and collected as ammonia water, avoiding ammonia gas entering the compressor and reducing the risk of ammonia leakage. At the same time, the low-concentration taurine-containing material realizes an increase in concentration, enabling it to directly obtain crude taurine through cooling crystallization and centrifugal separation, improving the recovery rate of the low-concentration taurine-containing material.

[0027] 4. The taurine-containing material concentration unit of the present utility model can also be used to process materials that need to be concentrated in any process within the plant area, realizing the synergy between different processes and having a wide range of applications. The present utility model can concentrate multiple materials with one set of system, which can save the floor area of equipment and improve the utilization rate of equipment.

[0028] Other features and advantages of the present utility model will be described in detail in the following specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By describing the exemplary embodiments of the present utility model in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present utility model will become more apparent. Among them, in the exemplary embodiments of the present utility model, the same reference numerals generally represent the same components.

[0030] Figure 1 FIG. 1 shows a schematic diagram of a multi-effect evaporation concentration system in Embodiment 1 of the present utility model.

[0031] Figure 2 FIG. 2 shows a schematic diagram of a multi-effect evaporation concentration system in Embodiment 2 of the present utility model.

[0032] Figure 3 FIG. 3 shows a schematic diagram of a multi-effect evaporation concentration system in Embodiment 3 of the present utility model.

[0033] DESCRIPTION OF THE REFERENCE NUMERALS

[0034] 1. Deammoniation unit; 2. Ammonia-containing material concentration unit; 3. Taurine-containing material concentration unit; 4. Gas-liquid separation unit; 5. Steam recovery unit; 6. Ammonia recovery unit; 7. Ammonia-containing material; 8. Taurine-containing material; 9. Deammoniation concentrate; 10. Taurine-containing concentrate. Reference numerals: DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following will describe the preferred embodiments of the present utility model in more detail. Although the following describes the preferred embodiments of the present utility model, it should be understood that the present utility model can be implemented in various forms and should not be limited by the embodiments described herein.

[0036] The present utility model relates to a multi-effect evaporation concentration system, specifically a multi-effect evaporation concentration system for taurine process, including

[0037] A deammoniation unit, which is respectively connected to the ammonia-containing material concentration unit and the taurine-containing material concentration unit, and is used for primary evaporation concentration and deammoniation of the ammonia-containing material. The ammonia-containing steam generated during the primary evaporation concentration and deammoniation process provides heat energy for the taurine-containing material concentration unit;

[0038] The ammonia-containing material concentration unit, connected to the gas-liquid separation unit, is used for the secondary evaporation and concentration of ammonia-containing materials;

[0039] The taurine-containing material concentration unit, connected to the gas-liquid separation unit, is used for the evaporation and concentration of taurine-containing materials;

[0040] The gas-liquid separation unit, connected to the steam recovery unit, is used for collecting the steam generated during the secondary evaporation and concentration of ammonia-containing materials and the evaporation and concentration of taurine-containing materials and defoaming;

[0041] The steam recovery unit, respectively connected to the deammoniation unit and the ammonia-containing material concentration unit, is used for recovering and heating up the defoamed steam to provide heat energy for the deammoniation unit and the ammonia-containing material concentration unit.

[0042] In the above multi-effect evaporation and concentration system, a fresh steam pipeline is also provided. The fresh steam pipeline is respectively connected to the deammoniation unit and the ammonia-containing material concentration unit and is used for steam supply during startup.

[0043] Since one of the main materials processed in the present utility model is the ammonia-containing material in the taurine preparation process, after the evaporation and concentration of the ammonia-containing material through the deammoniation unit, the generated steam contains ammonia and cannot be directly recycled through a compressor. Therefore, in the present utility model, a multi-effect evaporation and concentration system is designed to complete the deammoniation and concentration of the ammonia-containing material in the deammoniation unit and the ammonia-containing material concentration unit. In the taurine-containing material concentration unit, the heat of the ammonia-containing steam is recovered, and all the ammonia in the steam is condensed during this heat exchange process and collected as ammonia water. The above evaporation and concentration are preferably carried out in a falling film evaporator. In the falling film evaporator, the material is evenly distributed into each evaporator tube through a distributor, and the material forms a spiral film and flows downward under the action of gravity and steam heat source. At the same time, the material film exchanges heat with the steam on the outer wall of the tube bundle, so that the water in the material is evaporated by heat, and the secondary steam formed by the evaporated water is recovered for reuse, maximizing the utilization of heat energy and reducing steam consumption. Further preferably, the deammoniation unit, the ammonia-containing material concentration unit, and the taurine-containing material concentration unit all include at least one falling film evaporator, and the falling film evaporators can be connected in series, in parallel, or in a combination of both, depending on the specific working conditions.

[0044] In the deammoniation unit, the steam generated during the evaporation and concentration of the ammonia-containing material is sent to the taurine-containing material concentration unit, and the raw material after preliminary concentration is sent to the ammonia-containing material concentration unit.

[0045] In the ammonia-containing material concentration unit, the material from which ammonia has been removed is further concentrated to a set concentration and then withdrawn.

[0046] In the taurine-containing material concentration unit, ammonia-containing steam is used as a heat source to evaporate and concentrate the material containing low-concentration taurine. Common materials containing low-concentration taurine include taurine mother liquor, sperm mother liquor, etc. After heat exchange in the taurine-containing material concentration unit, ammonia can be completely condensed and collected as ammonia water. The collected ammonia water can be returned to the taurine production system for reuse after further treatment. The uncondensed gas phase in the taurine-containing material concentration unit is sent to the tail gas treatment system. Preferably, the multi-effect evaporation concentration system further includes an ammonia recovery unit, which is connected to the taurine-containing material concentration unit for recovering ammonia water.

[0047] In the present utility model, the steam generated in the ammonia-containing material concentration unit and the taurine-containing material concentration unit is sent to the gas-liquid separation unit. After mixing and defoaming in the gas-liquid separation unit, it is sent to the steam recovery unit.

[0048] In the present utility model, the secondary steam separated and defoamed by the gas-liquid separation unit is recovered and heated up in the steam recovery unit, and then returns to the system to completely replace the fresh steam to supply heat to the ammonia removal unit and the ammonia-containing material concentration unit. In the present utility model, there is no limitation on the equipment of the steam recovery unit, as long as it can meet the recovery and heating of steam. A compressor commonly used in the art can be selected. Preferably, the steam recovery unit in the multi-effect evaporation concentration system includes at least one compressor, and multiple compressors can be connected in series and / or in parallel. Further preferably, the compressor is a centrifugal compressor.

[0049] In order to cooperate with the aforementioned falling film separator, preferably, the gas-liquid separation unit includes at least one falling film separator. In addition, the gas-liquid separation unit can preferably be provided with at least one scrubbing tower. The scrubbing tower can be used alone or in combination with the falling film separator. When the falling film separator and the scrubbing tower are used in series, the scrubbing tower further washes and defoams the secondary steam separated by the falling film separator, significantly improving the defoaming effect, thereby ensuring the stable and effective operation of the compressor and the cleanliness of the distilled water.

[0050] In order to improve the heat exchange efficiency and give full play to the synergistic effect between multiple material concentration units, preferably, the heat exchange area ratio of the ammonia removal unit, the ammonia-containing material concentration unit, and the taurine-containing material concentration unit is 1:1 - 2:2 - 4. Preferably, the heat exchange area ratio of the ammonia removal unit, the ammonia-containing material concentration unit, and the taurine-containing material concentration unit is 1:1 - 1.8:2 - 3.

[0051] To make full use of the heat of the condensate, preferably, the multi-effect evaporation and concentration system further includes a condensate recovery unit, which is respectively connected to the deammoniation unit, the ammonia-containing material concentration unit, and the steam recovery unit, and is used to collect the condensate water in the deammoniation unit, the ammonia-containing material concentration unit, and the steam recovery unit. Further preferably, the multi-effect evaporation and concentration system further includes a preheating unit, which is respectively connected to the condensate recovery unit and the taurine-containing material concentration unit, and is used for preheating the taurine-containing material.

[0052] In the present utility model, the condensate water generated during the steam heat exchange or compression process is collected, and the taurine-containing material is preheated before entering the taurine-containing material concentration unit. This can not only recover the heat source of the condensate water, but also reduce the heat exchange area of the taurine-containing material concentration unit, further reducing costs. The preheating of the taurine-containing material can use any heat exchanger, preferably a plate heat exchanger.

[0053] In the present utility model, the multi-effect evaporation and concentration system preferably includes an automatic control unit for the automatic control of the multi-effect evaporation and concentration system.

[0054] The solution of the present invention will be explained below in conjunction with embodiments. Those skilled in the art will understand that the following embodiments are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.

[0055] Embodiment 1

[0056] A multi-effect evaporation and concentration system, as Figure 1 shown, the system includes: a deammoniation unit 1, an ammonia-containing material concentration unit 2, a taurine-containing material concentration unit 3, a gas-liquid separation unit 4, a steam recovery unit 5, and an ammonia recovery unit 6. Among them, the feed port of the deammoniation unit 1 is connected to the ammonia-containing material feed pipeline, the liquid-phase material outlet is connected to the feed port of the ammonia-containing material concentration unit 2, and the ammonia-containing steam outlet is connected to the taurine-containing material concentration unit 3.

[0057] The liquid-phase outlet of the ammonia-containing material concentration unit 2 is connected to the deammoniation concentrated liquid extraction pipeline, and the steam outlet is connected to the gas-liquid separation unit 4.

[0058] The feed port of the taurine-containing material concentration unit 3 is connected to the taurine-containing material feed pipeline, the liquid-phase discharge port is connected to the taurine concentrated liquid extraction pipeline, the steam outlet is connected to the gas-liquid separation unit 4, and the condensate outlet is connected to the ammonia recovery unit 6.

[0059] The gas-liquid separation unit 4 is connected to the steam recovery unit 5, and the steam recovery unit 5 is respectively connected to the heat source inlets of the deammoniation unit 1 and the ammonia-containing material concentration unit 2.

[0060] In the above multi-effect evaporation concentration system, the ammonia-containing material 7 undergoes primary concentration and ammonia removal in the ammonia removal unit 1 and is then sent to the ammonia-containing material concentration unit 2, where it is further concentrated to a set concentration and then withdrawn. The ammonia-containing steam evaporated in the ammonia removal unit 1 is sent as a steam heat source to the taurine-containing material concentration unit 3, and the steam generated during the evaporation and concentration process in the ammonia-containing material concentration unit 2 is sent to the gas-liquid separation unit 4.

[0061] In the taurine-containing material concentration unit 3, the ammonia-containing steam exchanges heat with the material containing low-concentration taurine. The material containing low-concentration taurine is evaporated and concentrated to a set concentration and then withdrawn. The steam generated during the evaporation and concentration process is sent to the gas-liquid separation unit 4, and the ammonia in the steam is completely condensed and then sent to the ammonia recovery unit 6.

[0062] The steam in the gas-liquid separation unit 4 is sent to the steam recovery unit 5 after defoaming. In the steam recovery unit 5, the steam is heated and then sent back to the ammonia removal unit 1 and the ammonia-containing material concentration unit 2 for use as a heat source.

[0063] Example 2

[0064] A multi-effect evaporation concentration system, as Figure 2 shown, the system includes: an ammonia removal unit 1, an ammonia-containing

[0065] material concentration unit 2, a taurine-containing material concentration unit 3, a gas-liquid separation unit 4, a steam recovery unit 5, and an ammonia recovery unit 6. Among them, the ammonia removal unit 1 is provided with a falling film evaporator I, the ammonia-containing material concentration unit 2 is provided with a falling film evaporator II, the taurine-containing material concentration unit 3 is provided with a falling film evaporator III, the gas-liquid separation unit 4 is provided with a falling film separator, the steam recovery unit 5 is provided with a centrifugal compressor, and the ammonia recovery unit 6 is provided with an ammonia water tank.

[0066] The feed inlet of the falling film evaporator I is connected to the taurine flash liquid (ammonia-containing material) feed pipeline, the liquid phase discharge outlet is connected to the feed inlet of the falling film evaporator II, and the steam outlet of the lower tube sheet is connected to the steam end inlet of the falling film evaporator III.

[0067] The discharge outlet of the falling film evaporator II is connected to the flash liquid concentrated liquid pipeline, and the steam outlet of the lower tube sheet is connected to the falling film separator.

[0068] The feed inlet of the falling film evaporator III is connected to the taurine mother liquor (material containing low-concentration taurine) feed pipeline, the discharge outlet is connected to the taurine mother liquor concentrated liquid discharge pipeline, and the steam outlet of the lower tube sheet is connected to the falling film separator.

[0069] The gas phase outlet of the falling film separator is connected to the centrifugal compressor, and the outlet of the centrifugal compressor is respectively connected to the steam end inlets of the falling film evaporator I and the falling film evaporator II.

[0070] The multi-effect evaporation concentration system is also provided with a condensate storage tank and a feed preheating heat exchanger. The condensate storage tank is used to collect the condensate water from the falling film evaporator I, the falling film evaporator II and the compressor, and then this part of the condensate water is used to preheat the taurine mother liquor in the feed preheating heat exchanger.

[0071] In the above multi-effect concentration system, the flash liquid with a concentration of 10-25% and a temperature of 100-110 °C enters the falling film evaporator I through the flash liquid feed pipeline, exchanges heat with the steam, and the generated steam is sent to the falling film evaporator III as a steam heat source. The bottom liquid phase part is sent to the top of the falling film evaporator I for material circulation, and part is taken out after reaching a certain concentration and sent to the falling film evaporator II.

[0072] The taurine mother liquor with a taurine concentration of 5-20% and a temperature of 60-80 °C after being preheated by the preheating heat exchanger is sent to the falling film evaporator III for evaporation and concentration. The generated steam is sent to the falling film separator for defoaming, and the processed secondary steam is sent to the centrifugal compressor to be heated up and then returned to the falling film evaporator I as a heat source. Part of the evaporated and concentrated taurine mother liquor exchanges heat in a circulating manner from top to bottom, and part is taken out when the taurine concentration reaches 20-35% and the temperature reaches 95-110 °C.

[0073] The flash liquid that has been deammoniated and preliminarily concentrated in the falling film evaporator I continues to be evaporated and concentrated in the falling film evaporator II. The generated steam is sent to the falling film separator, and the secondary steam separated after defoaming is sent to the centrifugal compressor to be heated up and then returned to the falling film evaporator II as a heat source. Part of the concentrated liquid of the flash liquid exchanges heat in a circulating manner from top to bottom, and part is taken out when the concentration reaches 25-40% and the temperature reaches 20-50 °C and sent to the downstream neutralization device. The condensate water generated during the heat exchange process in the falling film evaporator I and the falling film evaporator II and the condensate water generated by the centrifugal compressor are all sent to the condensate storage tank. This part of the condensate water exchanges heat with the taurine refined mother liquor in the preheating heat exchanger and then is sent to the boiler for recovery.

[0074] Example 3

[0075] A multi-effect evaporation concentration system, as Figure 2 shown, the system includes: a deammoniation unit 1, an ammonia-containing material concentration unit 2, a taurine-containing material concentration unit 3, a gas-liquid separation unit 4, a steam recovery unit 5, and an ammonia recovery unit 6. Among them, the deammoniation unit 1 is provided with a falling film evaporator I, the ammonia-containing material concentration unit 2 is provided with a falling film evaporator II 2-1 and a falling film evaporator IV 2-2, the taurine-containing material concentration unit 3 is provided with a falling film evaporator III, the gas-liquid separation unit 4 is provided with a falling film separator 4-1 and a scrubbing tower 4-2, the steam recovery unit 5 is provided with a centrifugal compressor, and the ammonia recovery unit 6 is provided with an ammonia water tank.

[0076] The feed inlet of the falling film evaporator I is connected to the feed pipeline of the taurine flash liquid (ammonia-containing material), the liquid-phase discharge port is connected to the feed inlet of the falling film evaporator II 2-1, and the steam outlet of the lower tube box is connected to the steam end inlet of the falling film evaporator III.

[0077] The discharge port of the falling film evaporator II 2-1 is connected to the feed inlet of the falling film evaporator IV 2-2, and the steam outlet of the lower tube box is connected to the falling film separator 4-1.

[0078] The discharge port of the falling film evaporator IV 2-2 is connected to the flash liquid concentrate pipeline, and the steam outlet of the lower tube box is connected to the falling film separator.

[0079] The feed inlet of the falling film evaporator III is connected to the feed pipeline of the taurine seminude liquid (taurine material with low concentration), the discharge port is connected to the discharge pipeline of the taurine seminude liquid concentrate, and the steam outlet of the lower tube box is connected to the falling film separator 4-1.

[0080] The gas-phase outlet of the falling film separator 4-1 is successively connected to the scrubbing tower 4-2 and the centrifugal compressor. The outlet of the centrifugal compressor is respectively connected to the steam end inlets of the falling film evaporator I, the falling film evaporator II 2-1, and the falling film evaporator IV 2-2.

[0081] A condensate storage tank and a feed preheating heat exchanger are also provided in the multi-effect evaporation and concentration system. The condensate storage tank is used to collect the condensate water of the falling film evaporator I, the falling film evaporator II, and the compressor, and then use this part of the condensate water to preheat the taurine mother liquor in the feed preheating heat exchanger.

[0082] In the above multi-effect concentration system, the flash liquid with a concentration of 10-25% and a temperature of 100-110°C enters the falling film evaporator I through the flash liquid feed pipeline, exchanges heat with the steam, and the generated steam is sent to the falling film evaporator III as a steam heat source. The bottom liquid phase part is sent to the top of the falling film evaporator I for material circulation, and part is taken out after reaching a certain concentration and sent to the falling film evaporator II.

[0083] The taurine seminude liquid with a concentration of 5-20% and a temperature of 60-85°C after being preheated by the preheating heat exchanger is sent to the falling film evaporator III for evaporation and concentration. The generated steam is sent to the falling film separator for defoaming, and the processed secondary steam is sent to the centrifugal compressor to be heated up and then returned to the falling film evaporator I as a heat source. Part of the evaporated and concentrated taurine mother liquor circulates and exchanges heat from top to bottom, and part is taken out after reaching a concentration of 20-35% and a temperature of 95-110°C.

[0084] The flash liquid that has been deammoniated and preliminarily concentrated by the falling film evaporator I continues to be continuously evaporated and concentrated in the falling film evaporator II and the falling film evaporator IV. The steam generated in the falling film evaporator II and the falling film evaporator IV is sent to the falling film separator. After defoaming, the secondary steam separated is sent to the scrubbing tower for defoaming again, and then sent to the centrifugal compressor to be heated up and returned to the falling film evaporator II as a heat source. Part of the concentrated liquid of the flash liquid is circulated for heat exchange from top to bottom, and part is taken out and sent to the downstream neutralization device after reaching a concentration of 25-40% and a temperature of 20-50°C. The condensate generated during the heat exchange process in the falling film evaporator I, the falling film evaporator II, and the falling film evaporator IV, as well as the condensate generated by the centrifugal compressor, are all sent to the condensate storage tank. This part of the condensate is sent to the boiler for recovery after exchanging heat with the taurine mother liquor in the preheating heat exchanger to recover heat.

[0085] As can be seen from the above embodiments, the multi-effect evaporation and concentration system of the present utility model can realize the evaporation and concentration of two materials simultaneously. It not only has a simple process flow, low energy consumption, small equipment floor area, but also can realize full-automatic operation, and is safer and more reliable.

[0086] The embodiments of the present utility model have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments.

Claims

1. A multi-effect evaporation concentration system, characterized in that, The system includes: A deammoniation unit, which is respectively connected to an ammonia-containing material concentration unit and a taurine-containing material concentration unit, and is used for primary evaporation concentration and deammoniation of the ammonia-containing material. The ammonia-containing steam generated during the primary evaporation concentration and deammoniation process provides heat energy for the taurine-containing material concentration unit; The ammonia-containing material concentration unit, which is connected to the gas-liquid separation unit and is used for secondary evaporation concentration of the ammonia-containing material; The taurine-containing material concentration unit, which is connected to the gas-liquid separation unit and is used for evaporation concentration of the taurine-containing material; The gas-liquid separation unit, which is connected to the steam recovery unit and is used for collecting the steam generated during the secondary evaporation concentration of the ammonia-containing material and the evaporation concentration of the taurine-containing material and removing foam; The steam recovery unit, which is respectively connected to the deammoniation unit and the ammonia-containing material concentration unit, and is used for recovering and heating up the defoamed steam to provide heat energy for the deammoniation unit and the ammonia-containing material concentration unit.

2. The multi-effect evaporation concentration system according to claim 1, wherein The multiple-effect evaporation concentration system further includes an automatic control unit, which is used for the automatic control of the multiple-effect evaporation concentration system.

3. The multi-effect evaporation concentration system according to claim 1, characterized in that, The multiple-effect evaporation concentration system further includes a condensate recovery unit. The condensate recovery unit is respectively connected to the deammoniation unit, the ammonia-containing material concentration unit and the steam recovery unit, and is used for collecting the condensate water in the deammoniation unit, the ammonia-containing material concentration unit and the steam recovery unit.

4. The multi-effect evaporation concentration system according to claim 3, characterized in that, The multiple-effect evaporation concentration system further includes a preheating unit. The preheating unit is respectively connected to the condensate recovery unit and the taurine-containing material concentration unit, and is used for preheating the taurine-containing material.

5. The multi-effect evaporation concentration system according to claim 4, wherein, The preheating unit includes at least one plate heat exchanger.

6. The multi-effect evaporation concentration system according to claim 1, characterized in that, The multiple-effect evaporation concentration system further includes an ammonia recovery unit. The ammonia recovery unit is connected to the taurine-containing material concentration unit and is used for recovering ammonia water.

7. The multi-effect evaporation concentration system according to claim 1, characterized in that, The deammoniation unit, the ammonia-containing material concentration unit and the taurine-containing material concentration unit all include at least one falling film evaporator.

8. The multi-effect evaporation concentration system according to claim 7, characterized in that, The heat transfer area ratio of the deammoniation unit, the ammonia-containing material concentration unit and the taurine-containing material concentration unit is 1:1~2:2~4.

9. The multi-effect evaporation concentration system according to claim 7, characterized in that, The heat transfer area ratio of the deammoniation unit, the ammonia-containing material concentration unit and the taurine-containing material concentration unit is 1:1~1.8:2~3.

10. The multi-effect evaporation concentration system according to claim 7, wherein The multiple-effect evaporation concentration system according to claim 7, wherein the gas-liquid separation unit includes at least one falling film separator and / or at least one scrubbing tower.

11. The multi-effect evaporation concentration system according to claim 1, wherein The steam recovery unit includes at least one compressor.

12. The multi-effect evaporation concentration system according to claim 11, wherein The compressor is a centrifugal compressor.

Images