Tryptophan TVR Evaporation Concentration Crystallization System

Abstract

This utility model discloses a tryptophan TVR evaporation concentration and crystallization system, comprising a first-effect evaporator crystallizer A, a first-effect evaporator crystallizer B, a second-effect evaporator crystallizer, and a third-effect evaporator crystallizer connected in series along the material flow direction. The air inlet of the first-effect evaporator crystallizer A and the air inlet of the first-effect evaporator crystallizer B are connected to the air outlet of a steam ejector. The secondary steam outlet of the first-effect evaporator crystallizer A and the secondary steam outlet of the first-effect evaporator crystallizer B are connected to the secondary steam pipeline of the first-effect evaporator crystallizer. The secondary steam pipeline of the first-effect evaporator crystallizer is connected to the air inlet of the second-effect evaporator crystallizer. The secondary steam outlet of the second-effect evaporator crystallizer is connected to the air inlet of the third-effect evaporator crystallizer. This utility model extracts part of the evaporated secondary steam through the steam ejector, compresses it, increases its pressure and temperature to increase its enthalpy value, and then sends it back to the evaporation concentration and crystallization system as a heat source, thereby improving the steam heat utilization rate, reducing the amount of live steam used, and reducing production costs.

Description

Technical Field

[0001] This utility model relates to the field of tryptophan production technology, specifically to a tryptophan TVR evaporation, concentration and crystallization system. Background Technology

[0002] L-Tryptophan is one of the eight essential amino acids required for human and animal life activities. It plays a vital role in the growth, development, and metabolism of humans and animals, and is known as the second essential amino acid. It is widely used in the pharmaceutical, food, and feed industries. The most common method for producing L-Tryptophan is microbial fermentation. The main processes include fermentation, filtration, sterilization, decolorization, concentration, crystallization, centrifugation, and drying. Specifically, the fermentation broth containing L-Tryptophan produced by microbial fermentation is filtered, sterilized, and decolorized to obtain a clear solution containing L-Tryptophan. The concentration of the L-Tryptophan solution is approximately 1.5% to 2.5%, which is very low. Therefore, the L-Tryptophan solution must undergo a concentration and crystallization process to form a crystal slurry. This crystal slurry is then centrifuged and dried to obtain L-Tryptophan crystals.

[0003] Currently, when producing L-tryptophan using microbial fermentation, a multi-effect evaporation system is typically used to concentrate and crystallize the L-tryptophan solution. However, due to the low concentration and high water content of the L-tryptophan solution, evaporation and concentration are difficult, requiring a large amount of high-temperature steam. Furthermore, the boiling point of L-tryptophan solution increases with increasing concentration. A multi-effect evaporation system consists of multiple evaporators connected in series. The first-effect evaporator uses high-temperature live steam as a heat source to evaporate, concentrate, and crystallize the L-tryptophan solution. Subsequent evaporators use secondary steam generated by the preceding evaporator as their heat source. In this evaporation, concentration, and crystallization method, the temperature of the live steam in the first-effect evaporator is the highest, while the temperature of the secondary steam in subsequent evaporators decreases with each effect. However, the concentration of the L-tryptophan solution increases with each effect, and consequently, the boiling point increases with each effect. The secondary steam entering the last-effect evaporator has the lowest temperature, while the solution entering the last-effect evaporator has the highest boiling point. This low heat source temperature coupled with a high boiling point results in poor evaporation performance, low evaporation efficiency, and difficulty in evaporation. To ensure the evaporation effect of the multi-effect evaporation system, current technicians typically increase the supply of high-temperature steam entering the system, further increasing steam consumption, increasing the cost of L-tryptophan solution concentration and crystallization, and significantly increasing the production cost of L-tryptophan. Utility Model Content

[0004] In summary, in order to overcome the shortcomings of existing technologies, this utility model provides a tryptophan TVR evaporation concentration and crystallization system, which utilizes steam thermal recompression (TVR) technology. A portion of the evaporated secondary steam is extracted by a steam ejector, compressed, and then used as a heat source to increase the enthalpy value before being fed back into the evaporation concentration and crystallization system. This improves the utilization rate of steam heat, reduces the amount of live steam used, and lowers production costs.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A tryptophan TVR evaporation concentration and crystallization system, comprising a first-effect evaporator A, a first-effect evaporator B, a second-effect evaporator Crystallizer, and a third-effect evaporator Crystallizer connected in series along the material flow direction. The first-effect evaporator A, first-effect evaporator B, and second-effect evaporator Crystallizer are all centrally circulating tube evaporators, and the third-effect evaporator Crystallizer is a forced-circulation evaporator Crystallizer. The inlet of the first-effect evaporator A is connected to the outlet of the feed pump, and the inlet of the feed pump is connected to the raw material tank storing low-concentration tryptophan. The outlet of the third-effect evaporator is connected to the inlet of the discharge pump, and the outlet of the discharge pump is connected to the third-effect discharge pipeline. The air inlet of the first-effect evaporator crystallizer A and the air inlet of the first-effect evaporator crystallizer B are connected to the air outlet of the steam ejector. The secondary steam outlet of the first-effect evaporator crystallizer A and the secondary steam outlet of the first-effect evaporator crystallizer B are connected to the first-effect secondary steam pipeline. The first-effect secondary steam pipeline is connected to the air intake of the steam ejector and the air inlet of the second-effect evaporator crystallizer. The secondary steam outlet of the second-effect evaporator crystallizer is connected to the air inlet of the third-effect evaporator crystallizer. The secondary steam outlet of the third-effect evaporator crystallizer is connected to the air inlet of the condenser. The air outlet of the condenser is connected to the air inlet of the vacuum pump. The air outlet of the vacuum pump is vented. The air inlet of the steam ejector is connected to the steam source through the live steam pipeline.

[0006] Furthermore, the triple-effect evaporator crystallizer includes a triple-effect heater, a triple-effect separator, and a triple-effect circulating pump. The inlet of the triple-effect circulating pump is connected to the triple-effect feed pipeline, the outlet of the triple-effect circulating pump is connected to the inlet of the triple-effect heater, the outlet of the triple-effect heater is connected to the inlet of the triple-effect separator, the outlet of the triple-effect separator is connected to the inlet of the triple-effect circulating pump and the inlet of the discharge pump, and a triple-effect discharge valve is installed on the pipeline connecting the outlet of the triple-effect separator and the inlet of the discharge pump.

[0007] Furthermore, the triple-effect separator is equipped with a triple-effect level gauge for monitoring the material level inside. A triple-effect feed valve is installed on the triple-effect feed pipe. The triple-effect level gauge is electrically connected to the triple-effect feed valve. The triple-effect feed valve is adjusted by controlling the material level inside the triple-effect separator. The triple-effect discharge pipe is connected to the triple-effect return pipe, discharge pipe, return pipe, and cleaning drainage pipe. A triple-effect return valve is installed on the triple-effect return pipe. A discharge valve is installed on the discharge pipe. A return valve is installed on the return pipe. A cleaning drainage valve is installed on the cleaning drainage pipe. A discharge mass density meter for monitoring the concentration of crystal slurry after evaporation and crystallization is installed on the triple-effect discharge pipe. The discharge mass density meter is electrically connected to the discharge valve. The discharge valve is adjusted by controlling the concentration of crystal slurry.

[0008] Furthermore, the triple-effect separator is equipped with a triple-effect pressure sensor for monitoring its internal pressure. The pipeline connecting the outlet of the condenser to the inlet of the vacuum pump is connected to a pressure regulating pipeline, which is connected to the atmosphere. A pressure regulating valve is installed on the pressure regulating pipeline, and the triple-effect pressure sensor is electrically connected to the pressure regulating valve. The pressure regulating valve is adjusted by controlling the pressure inside the triple-effect separator.

[0009] Furthermore, the inlet of the feed pump is connected to a raw material tank storing low-concentration tryptophan via a material pipeline, and a material valve is installed on the material pipeline. The inlet of the feed pump is connected to a cleaning water tank via a cleaning pipeline, and a cleaning valve is installed on the cleaning pipeline.

[0010] Furthermore, the inlet of the first-effect evaporator crystallizer A is connected to the outlet of the feed pump through the first-effect feed pipe A. The first-effect evaporator crystallizer A is equipped with a first-effect level gauge A for monitoring the material level inside it. The first-effect feed pipe A is equipped with a first-effect feed valve A. The first-effect level gauge A is electrically connected to the first-effect feed valve A. The first-effect feed valve A is adjusted by controlling the material level inside the first-effect evaporator crystallizer A. The outlet of the first-effect evaporator crystallizer A is connected to the inlet of the first-effect conveying pump A. The outlet of the first-effect conveying pump A is connected to the first-effect return pipe A and the first-effect feed pipe B. The first-effect return pipe A is equipped with a first-effect return valve A.

[0011] Furthermore, the first-effect evaporator crystallizer B is equipped with a first-effect level gauge B for monitoring the material level inside, and a first-effect feed valve B is installed on the first-effect feed pipeline B. The first-effect level gauge B is electrically connected to the first-effect feed valve B. The first-effect feed valve B is adjusted by controlling the material level inside the first-effect evaporator crystallizer B. The outlet of the first-effect evaporator crystallizer B is connected to the inlet of the first-effect conveying pump B. The outlet of the first-effect conveying pump B is connected to the first-effect return pipeline B and the second-effect feed pipeline. A first-effect return valve B is installed on the first-effect return pipeline B.

[0012] Furthermore, the double-effect evaporator crystallizer is equipped with a double-effect level gauge for monitoring the material level inside. A double-effect feed valve is installed on the double-effect feed pipeline. The double-effect level gauge is electrically connected to the double-effect feed valve. The double-effect feed valve is adjusted by controlling the material level inside the double-effect evaporator crystallizer. The outlet of the double-effect evaporator crystallizer is connected to the inlet of the double-effect conveying pump. The outlet of the double-effect conveying pump is connected to the double-effect return pipeline and the triple-effect feed pipeline. A double-effect return valve is installed on the double-effect return pipeline.

[0013] Furthermore, the non-condensable gas outlets of the first-effect evaporator crystallizer A and the first-effect evaporator crystallizer B are connected to the inlet of the second-effect evaporator crystallizer, the non-condensable gas outlet of the second-effect evaporator crystallizer is connected to the inlet of the third-effect evaporator crystallizer, and the non-condensable gas outlet of the third-effect heater of the third-effect evaporator crystallizer is connected to the inlet of the condenser.

[0014] Furthermore, the condensate outlets of the first-effect evaporator crystallizer A, the first-effect evaporator crystallizer B, the second-effect evaporator crystallizer, the triple-effect heater of the third-effect evaporator crystallizer, and the condenser are connected to the inlet of the condensate tank. The outlet of the condensate tank is connected to the inlet of the condensate pump, and the outlet of the condensate pump is connected to the condensate drain pipe. The vent of the condensate tank is connected to the vent of the condenser. A condensate level gauge is installed on the condensate tank to monitor the liquid level inside. A condensate drain valve is installed on the condensate drain pipe. The condensate level gauge is electrically connected to the condensate drain valve, and the condensate drain valve is adjusted by controlling the liquid level inside the condensate tank.

[0015] Furthermore, the outlet of the first-effect evaporator crystallizer A is connected to the main drain pipe through the first-effect drain pipe A, and the first-effect drain pipe A is equipped with a first-effect drain valve A. The outlet of the first-effect evaporator crystallizer B is connected to the main drain pipe through the first-effect drain pipe B, and the first-effect drain pipe B is equipped with a first-effect drain valve B. The outlet of the second-effect evaporator crystallizer is connected to the main drain pipe through the second-effect drain pipe, and the second-effect drain pipe is equipped with a second-effect drain valve. The outlet of the third-effect separator of the third-effect evaporator crystallizer is connected to the main drain pipe through the third-effect drain pipe, and the third-effect drain pipe is equipped with a third-effect drain valve. The outlet of the condensate tank is connected to the main drain pipe through the condensate drain pipe, and the condensate drain pipe is equipped with a condensate drain valve.

[0016] Furthermore, the first-effect evaporator crystallizer A is equipped with a first-effect pressure sensor to monitor the pressure inside the first-effect evaporator crystallizer A, and a steam valve and a steam flow meter are installed on the live steam pipeline. The first-effect pressure sensor is electrically connected to the steam valve, and the steam valve is controlled and regulated by the pressure inside the first-effect evaporator crystallizer A.

[0017] Furthermore, the flushing port of the first-effect evaporator crystallizer A is connected to the flushing tank via the first-effect upper flushing pipe A, and the first-effect upper flushing valve A is installed on the first-effect upper flushing pipe A. The flushing port of the first-effect evaporator crystallizer B is connected to the flushing tank via the first-effect upper flushing pipe B, and the first-effect upper flushing valve B is installed on the first-effect upper flushing pipe B. The flushing port of the second-effect evaporator crystallizer is connected to the flushing tank via the second-effect upper flushing pipe, and the second-effect upper flushing valve is installed on the second-effect upper flushing pipe. The flushing port of the third-effect separator of the third-effect evaporator crystallizer is connected to the flushing tank via the third-effect upper flushing pipe, and the third-effect upper flushing pipe... The pipeline is equipped with a triple-effect top flushing valve. The inlet of the first-effect conveying pump A is connected to the flushing tank through the first-effect bottom flushing pipeline A, and the first-effect bottom flushing valve A is installed on the first-effect bottom flushing pipeline A. The inlet of the first-effect conveying pump B is connected to the flushing tank through the first-effect bottom flushing pipeline B, and the first-effect bottom flushing valve B is installed on the first-effect bottom flushing pipeline B. The inlet of the second-effect conveying pump is connected to the flushing tank through the second-effect bottom flushing pipeline, and the second-effect bottom flushing valve is installed on the second-effect bottom flushing pipeline. The inlet of the discharge pump is connected to the flushing tank through the triple-effect bottom flushing pipeline, and the triple-effect bottom flushing valve is installed on the triple-effect bottom flushing pipeline.

[0018] Furthermore, the first-effect evaporator crystallizer A, the first-effect evaporator crystallizer B, and the second-effect evaporator crystallizer are all centrally circulating tube evaporators, including a tank, an intermediate tube, a heating tube, an upper baffle, and a lower baffle. The lower part of the tank is provided with an upper baffle and a lower baffle arranged vertically, and the intermediate tube is located at the center of the lower part of the tank. The upper and lower baffles are fixedly connected to the upper and lower ends of the intermediate tube, respectively. The upper baffle, lower baffle, and intermediate tube divide the inner cavity of the tank into a separation chamber, a heating chamber, and a circulation chamber. The separation chamber is the inner cavity above the upper baffle in the tank, and the heating chamber is the inner cavity in the lower part of the tank. The tank is enclosed by a cavity formed by the inner wall of the intermediate pipe, the outer wall of the intermediate pipe, the upper partition, and the lower partition. The circulation cavity is the inner cavity of the tank body below the intermediate pipe and the lower partition. A heating pipe is installed in the heating cavity. The upper and lower ends of the heating pipe are fixedly connected to the upper partition and the lower partition, respectively. The heating pipe connects the separation cavity above the upper partition and the circulation cavity below the lower partition of the tank body. A secondary steam outlet is provided at the upper end of the separation cavity. A feed inlet and a return outlet are provided at the lower part of the separation cavity. An air inlet, a condensate outlet, and a non-condensable gas outlet are provided on the heating cavity. A discharge outlet is provided at the lower end of the tank body.

[0019] Furthermore, the tank is equipped with a stirring device, which includes stirring blades, a stirring shaft, and a stirring power device. The stirring blades are located in the lower part of the intermediate tube, and the stirring shaft enters the tank from the lower end of the tank. Its upper end is connected to the stirring blades located in the intermediate tube, and the lower end of the stirring shaft is located on the outer side of the lower end of the tank and connected to the output shaft of the stirring power device.

[0020] Furthermore, a scraper is provided in the circulation chamber below the lower partition of the tank body. The scraper is fixedly connected to the stirring shaft and is in contact with the inner bottom surface of the tank body.

[0021] The beneficial effects of this utility model are as follows:

[0022] 1. This utility model utilizes thermal recompression (TVR) technology, which extracts part of the evaporated secondary steam through a steam ejector, compresses it, increases its enthalpy value by pressurizing and heating it, and then sends it back to the evaporation concentration and crystallization system as a heat source, thereby improving the utilization rate of steam heat, reducing the amount of live steam used, and reducing production costs.

[0023] 2. The outlet of the steam ejector of this utility model is connected to the inlet of the first-effect evaporator crystallizer A and the inlet of the first-effect evaporator crystallizer B through a pipeline. The pressurized and heated steam enters the first-effect evaporator crystallizer A and the first-effect evaporator crystallizer B respectively. The steam temperature entering the first-effect evaporator crystallizer B is high, and the temperature of the separated secondary steam is correspondingly high, which increases the temperature of the heat source steam of the second-effect evaporator crystallizer and the third-effect evaporator crystallizer, thereby ensuring the evaporation crystallization effect and improving the evaporation crystallization efficiency.

[0024] 3. The single-effect evaporator crystallizer A, single-effect evaporator crystallizer B, and double-effect evaporator crystallizer of this utility model all adopt a central circulation tube evaporator equipped with a stirrer. When the tryptophan solution concentration is low, the central circulation tube evaporator is used, relying on the thermal power of steam to make the solution boil and circulate naturally, without the need for an additional circulation pump. In addition, the stirrer installed in the central circulation tube evaporator improves the fluidity of the solution, avoids precipitation, and reduces clogging. The central circulation tube evaporator of this utility model has a scraper fixedly connected to the stirring shaft in the circulation chamber of the tank. The scraper rotates with the stirring shaft, which can scrape up the tryptophan crystals that have settled on the bottom surface of the tank, making it difficult for crystals in the solution to settle and effectively preventing clogging of the outlet.

[0025] 4. The triple-effect evaporator crystallizer of this invention adopts a forced circulation evaporator crystallizer. The tryptophan solution entering the triple-effect evaporator crystallizer has a high concentration. The forced circulation evaporator crystallizer is used to evaporate and concentrate it. The triple-effect circulation pump can circulate the high-concentration tryptophan solution at a high circulation rate, increasing heat exchange efficiency and delaying the cleaning cycle. 5. The inlet of the feed pump of this utility model is connected to the cleaning water tank through the cleaning pipeline. The feed pump delivers cleaning water to the entire system, which can clean the entire system. This utility model is equipped with a rinsing tank, which uses the rinsing water in the rinsing tank to rinse the system. The cleaning water tank and rinsing tank can perform chemical cleaning and hot water rinsing of the system as needed or at regular intervals, reducing cleaning time and cleaning costs, avoiding serious scaling and blockage, and ensuring the safety and stability of the system.

[0026] 6. This invention controls the feed valve by adjusting the material level within the evaporator crystallizer. When the material level is low, the opening of the feed valve is increased; when the material level is high, the opening of the feed valve is decreased, thereby controlling the feed flow rate and maintaining a constant liquid level in each evaporator. This invention monitors the crystal slurry concentration using a discharge mass density meter and controls the opening and closing of the discharge valve based on the crystal slurry concentration. This invention has a high degree of automation; the cooperation between the sensors and valves at various monitoring and control points enables automatic operation, automatic cleaning, and automatic discharge.

[0027] 7. This utility model has a simple structure, is easy to use, has low cost and high degree of automation. It can effectively realize the evaporation and crystallization of low-concentration tryptophan solution. Compared with the existing triple-effect evaporation system used for tryptophan solution, it has low evaporation energy consumption, good crystallization effect, high evaporation efficiency, low production cost and is not easy to clog pipes. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the central circulation tube evaporator of this utility model. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings.

[0030] like Figure 1As shown, a tryptophan TVR evaporation concentration and crystallization system includes a first-effect evaporator crystallizer A4, a first-effect evaporator crystallizer B6, a second-effect evaporator crystallizer 8, and a third-effect evaporator crystallizer connected in series along the material flow direction. The first-effect evaporator crystallizers A4, B6, and 8 are all centrally circulating tubular evaporators, while the third-effect evaporator crystallizer is a forced-circulation evaporator crystallizer. The inlet of the feed pump 3 is connected to a raw material tank 1 storing low-concentration tryptophan via a material pipeline. A material valve 22 is installed on the material pipeline. The outlet of feed pump 3 is connected to the inlet of first-effect evaporator crystallizer A4 via first-effect feed pipeline A. First-effect evaporator crystallizer A4 is equipped with a first-effect level gauge A29 for monitoring the material level inside. First-effect feed pipeline A is equipped with a first-effect feed valve A30 and a feed mass density meter for monitoring the raw material concentration. The first-effect level gauge A29 is electrically connected to the first-effect feed valve A30. The first-effect feed valve A30 is adjusted by controlling the material level inside the first-effect evaporator crystallizer A4. The outlet of first-effect evaporator crystallizer A4 is connected to the inlet of first-effect transfer pump A5. The discharge port of the first-effect conveying pump A5 is connected to the first-effect return pipeline A and the first-effect feed pipeline B. A first-effect return valve A31 is installed on the first-effect return pipeline A, and a first-effect feed valve B33 is installed on the first-effect feed pipeline B. The first-effect evaporator crystallizer B6 is equipped with a first-effect level gauge B32 for monitoring its internal material level. The first-effect feed pipeline B is equipped with a first-effect feed valve B33. The first-effect level gauge B32 is electrically connected to the first-effect feed valve B33. The first-effect feed valve B33 is adjusted by controlling the material level inside the first-effect evaporator crystallizer B6. The outlet of 6 is connected to the inlet of the first-effect conveying pump B7. The outlet of the first-effect conveying pump B7 is connected to the first-effect return pipeline B and the second-effect inlet pipeline. The first-effect return pipeline B is equipped with a first-effect return valve B34. The second-effect inlet pipeline is equipped with a second-effect inlet valve 36. The second-effect evaporator crystallizer 8 is equipped with a second-effect level gauge 35 for monitoring the material level inside. The second-effect inlet pipeline is equipped with a second-effect inlet valve 36. The second-effect level gauge 35 is electrically connected to the second-effect inlet valve 36. The second-effect inlet valve 36 is adjusted by controlling the material level inside the second-effect evaporator crystallizer 8.The outlet of the double-effect evaporator crystallizer 8 is connected to the inlet of the double-effect conveying pump 9. The outlet of the double-effect conveying pump 9 is connected to the double-effect return pipeline and the triple-effect inlet pipeline. A double-effect return valve 37 is installed on the double-effect return pipeline, and a triple-effect inlet valve 38 is installed on the triple-effect inlet pipeline. A triple-effect level gauge 39 is installed on the triple-effect separator 11 of the triple-effect evaporator crystallizer to monitor the material level inside. A triple-effect inlet valve 38 is installed on the triple-effect inlet pipeline. The triple-effect level gauge 39 is electrically connected to the triple-effect inlet valve 38. The triple-effect inlet valve 38 is adjusted by controlling the material level inside the triple-effect evaporator crystallizer. The outlet of the triple-effect evaporator crystallizer... The inlet of the discharge pump 13 is connected to the outlet of the discharge pump 13, which is connected to the triple-effect discharge pipeline. The triple-effect discharge pipeline is connected to the triple-effect return pipeline, the discharge pipeline, the return pipeline, and the cleaning and drainage pipeline. The triple-effect return pipeline is equipped with a triple-effect return valve 24, the discharge pipeline is equipped with a discharge valve 25, the return pipeline is equipped with a return valve 26, and the cleaning and drainage pipeline is equipped with a cleaning and drainage valve 27. The triple-effect discharge pipeline is equipped with a discharge mass density meter 28 for monitoring the concentration of crystal slurry after evaporation and crystallization. The discharge mass density meter 28 is electrically connected to the discharge valve 25, and the discharge valve 25 is adjusted by controlling the concentration of crystal slurry.

[0031] The air inlet of the first-effect evaporator crystallizer A4 and the air inlet of the first-effect evaporator crystallizer B6 are connected to the air outlet of the steam ejector 20. The secondary steam outlet of the first-effect evaporator crystallizer A4 and the secondary steam outlet of the first-effect evaporator crystallizer B6 are connected to the first-effect secondary steam pipeline. The first-effect secondary steam pipeline is connected to the air intake of the steam ejector 20 and the air inlet of the second-effect evaporator crystallizer 8. The secondary steam outlet of the second-effect evaporator crystallizer 8 is connected to the air inlet of the third-effect evaporator crystallizer. The secondary steam outlet of the third-effect evaporator crystallizer is connected to the condenser 1. The air inlet of 4 and the air outlet of condenser 14 are connected to the air inlet of vacuum pump 15. The air outlet of vacuum pump 15 is vented. The air inlet of steam ejector 20 is connected to steam source 21 through live steam pipeline. Steam valve 58 and steam flow meter are installed on the live steam pipeline. A first-effect evaporator crystallizer A4 is equipped with a first-effect pressure sensor 57 to monitor the pressure inside the first-effect evaporator crystallizer A4. The first-effect pressure sensor 57 is electrically connected to steam valve 58. The steam valve 58 is adjusted by controlling the pressure inside the first-effect evaporator crystallizer A4.

[0032] The non-condensable gas outlets of the first-effect evaporator crystallizer A4 and the first-effect evaporator crystallizer B6 are connected to the air inlet of the second-effect evaporator crystallizer 8. The non-condensable gas outlet of the second-effect evaporator crystallizer 8 is connected to the air inlet of the third-effect evaporator crystallizer. The non-condensable gas outlet of the third-effect evaporator crystallizer is connected to the air inlet of the condenser 14.

[0033] The condensate outlets of the first-effect evaporator crystallizer A4, the first-effect evaporator crystallizer B6, the second-effect evaporator crystallizer 8, the third-effect evaporator crystallizer, and the condensate outlet of the condenser 14 are connected to the inlet of the condensate tank 16. The outlet of the condensate tank 16 is connected to the inlet of the condensate pump 17, and the outlet of the condensate pump 17 is connected to the condensate drain pipe. The vent of the condensate tank 16 is connected to the vent of the condenser 14. A condensate level gauge 18 is installed on the condensate tank 16 to monitor the liquid level inside the condensate tank 16. A condensate drain valve 19 is installed on the condensate drain pipe. The condensate level gauge 18 is electrically connected to the condensate drain valve 19, and the condensate drain valve 19 is adjusted by controlling the liquid level inside the condensate tank 16.

[0034] The inlet of the feed pump 3 is connected to the cleaning water tank 2 via a cleaning pipeline, and a cleaning valve 23 is installed on the cleaning pipeline. The outlet of the first-effect evaporator crystallizer A4 is connected to the main drain pipe 50 via the first-effect drain pipe A, and a first-effect drain valve A49 is installed on the first-effect drain pipe A. The outlet of the first-effect evaporator crystallizer B6 is connected to the main drain pipe 50 via the first-effect drain pipe B, and a first-effect drain valve B51 is installed on the first-effect drain pipe B. The outlet of the second-effect evaporator crystallizer 8 is connected to the main drain pipe 50 via the second-effect drain pipe, and a second-effect drain valve 52 is installed on the second-effect drain pipe. The outlet of the third-effect evaporator crystallizer is connected to the main drain pipe 50 via the third-effect drain pipe, and a third-effect drain valve 53 is installed on the third-effect drain pipe. The outlet of the condensate tank 16 is connected to the main drain pipe 50 via the condensate drain pipe, and a condensate drain valve 54 is installed on the condensate drain pipe.

[0035] The flushing port of the first-effect evaporator crystallizer A4 is connected to the flushing tank 40 via the first-effect upper flushing pipe A, and the first-effect upper flushing pipe A is equipped with a first-effect upper flushing valve A41. The flushing port of the first-effect evaporator crystallizer B6 is connected to the flushing tank 40 via the first-effect upper flushing pipe B, and the first-effect upper flushing pipe B is equipped with a first-effect upper flushing valve B42. The flushing port of the second-effect evaporator crystallizer 8 is connected to the flushing tank 40 via the second-effect upper flushing pipe, and the second-effect upper flushing pipe is equipped with a second-effect upper flushing valve 43. The flushing port of the third-effect evaporator crystallizer is connected to the flushing tank 40 via the third-effect upper flushing pipe, and the third-effect upper flushing pipe is equipped with a third-effect upper flushing valve 43. The inlet of the first-effect conveying pump A5 is connected to the flushing tank 40 through the first-effect lower flushing pipeline A, and the first-effect lower flushing valve A45 is installed on the first-effect lower flushing pipeline A. The inlet of the first-effect conveying pump B7 is connected to the flushing tank 40 through the first-effect lower flushing pipeline B, and the first-effect lower flushing valve B46 is installed on the first-effect lower flushing pipeline B. The inlet of the second-effect conveying pump 9 is connected to the flushing tank 40 through the second-effect lower flushing pipeline, and the second-effect lower flushing valve 47 is installed on the second-effect lower flushing pipeline. The inlet of the discharge pump 13 is connected to the flushing tank 40 through the third-effect lower flushing pipeline, and the third-effect lower flushing valve 48 is installed on the third-effect lower flushing pipeline.

[0036] The triple-effect evaporator crystallizer is a forced circulation evaporator crystallizer, including a triple-effect heater 10, a triple-effect separator 11, and a triple-effect circulation pump 12. The inlet of the triple-effect circulation pump 12 is connected to the triple-effect feed pipeline, and the outlet of the triple-effect circulation pump 12 is connected to the inlet of the triple-effect heater 10. The outlet of the triple-effect heater 10 is connected to the inlet of the triple-effect separator 11, and the outlet of the triple-effect separator 11 is connected to both the inlet of the triple-effect circulation pump 12 and the inlet of the discharge pump 13. A triple-effect discharge valve is installed on the pipeline connecting the discharge port of the 11 to the inlet of the discharge pump 13. A triple-effect pressure sensor 55 is installed on the triple-effect separator 11 to monitor its internal pressure. The pipeline connecting the outlet of the condenser 14 to the inlet of the vacuum pump 15 is connected to a pressure regulating pipeline, which is connected to the atmosphere. A pressure regulating valve 56 is installed on the pressure regulating pipeline. The triple-effect pressure sensor 55 is electrically connected to the pressure regulating valve 56, and the pressure regulating valve 56 is adjusted by controlling the pressure inside the triple-effect separator 11.

[0037] like Figure 2As shown, the first-effect evaporator crystallizer A4, the first-effect evaporator crystallizer B6, and the second-effect evaporator crystallizer 8 are all central circulation tube evaporators, including a tank body 101, an intermediate tube 102, a heating tube 103, an upper baffle 104, and a lower baffle 105. The lower part of the tank body 101 is provided with the upper baffle 104 and the lower baffle 105 arranged vertically. The intermediate tube 102 is located at the center of the lower part of the tank body 101. The upper baffle 104 and the lower baffle 105 are fixedly connected to the upper and lower ends of the intermediate tube 102, respectively. The upper baffle 104, the lower baffle 105, and the intermediate tube 102 divide the inner cavity of the tank body 101 into a separation chamber 106, a heating chamber 107, and a circulation chamber 108. The separation chamber 106 is the inner cavity above the upper baffle 104 within the tank body 101, and the heating chamber 107 is the inner cavity above the upper baffle 104 within the tank body 101. The cavity is formed by the lower inner wall, the outer wall of the intermediate pipe 102, the upper partition 104, and the lower partition 105. The circulation chamber 108 is the inner cavity of the intermediate pipe 102 and the inner cavity of the tank 101 below the lower partition 105. The heating chamber 107 is provided with a heating pipe 103. The upper and lower ends of the heating pipe 103 are fixedly connected to the upper partition 104 and the lower partition 105, respectively. The heating pipe 103 connects the separation chamber 106 above the upper partition 104 of the tank 101 with the circulation chamber 108 below the lower partition 105. The upper end of the separation chamber 106 is provided with a secondary steam outlet. The lower part of the separation chamber 106 is provided with a feed inlet and a return outlet. The heating chamber 107 is provided with an air inlet, a condensate outlet, and a non-condensable gas outlet that communicate with the heating chamber 107. The lower end of the tank 101 is provided with a discharge outlet. A stirring device is provided on the tank body 101. The stirring device includes stirring blades 111, stirring shaft 110, and stirring power device 109. The stirring blades 111 are located in the lower part of the intermediate tube 102. The stirring shaft 110 enters the tank body 101 from the lower end, and its upper end is connected to the stirring blades 111 located in the intermediate tube 102. The lower end of the stirring shaft 110 is located on the outer side of the lower end of the tank body 101 and is connected to the output shaft of the stirring power device 109. A scraper 112 is provided in the circulation chamber 108 below the lower partition 105 in the tank body 101. The scraper 112 is fixedly connected to the stirring shaft 110 and is in contact with the inner bottom surface of the tank body 101.

[0038] In operation, start the feed pump 3, open the material valve 22, open the first-effect feed valve A30, open the steam valve 58, and start the vacuum pump 15. The vacuum pump 15 draws negative pressure from the system. The low-concentration tryptophan solution in the raw material tank 1 enters the first-effect evaporator crystallizer A4 along the first-effect feed pipeline A under the action of the feed pump 3. The live steam provided by the steam source 21 enters the first-effect evaporator crystallizer A4 along the live steam pipeline and after passing through the steam ejector 20 under the action of the negative pressure drawn by the vacuum pump 15. In the first-effect evaporator crystallizer A4, the live steam heats the low-concentration tryptophan solution, causing the tryptophan solution to evaporate, concentrate, and crystallize, increasing its concentration before entering the first-effect evaporator. The steam in crystallizer A4 is cooled and condensed into condensate. The solution with increased concentration is transported by the first-effect transfer pump A5 and enters the first-effect evaporator crystallizer B6 through the first-effect feed pipe B. The live steam provided by steam source 21 enters the first-effect evaporator crystallizer B6 after passing through the steam ejector 20. In the first-effect evaporator crystallizer B6, the live steam heats the increased concentration of the tryptophan solution and it is evaporated, concentrated and crystallized again, increasing the concentration of the tryptophan solution again. The steam in the first-effect evaporator crystallizer B6 is cooled and condensed into condensate. The solution with increased concentration is then transported by the first-effect transfer pump B7 and enters the second-effect evaporator crystallizer 8 through the second-effect feed pipe.

[0039] The secondary steam evaporated from the first-effect evaporator A4 and the second-effect evaporator B6 enters the secondary steam pipeline. Part of the secondary steam in the pipeline enters the evaporator ejector and the second-effect evaporator crystallizer 8. The secondary steam entering the ejector is pressurized and heated, increasing its enthalpy, and then re-enters the first-effect evaporator crystallizers A4 and B6 to participate in the evaporation, concentration, and crystallization of the tryptophan solution. The remaining secondary steam in the pipeline enters the second-effect evaporator crystallizer 8. In the second-effect evaporator crystallizer 8, the tryptophan solution, after two concentration increases, is heated again by the secondary steam, undergoing a third evaporation, concentration, and crystallization. The concentration of the tryptophan solution increases three times. The steam entering the second-effect evaporator crystallizer 8 cools and condenses into condensate. The secondary steam evaporated from the second-effect evaporator crystallizer 8 enters the third-effect evaporator... The tryptophan solution, after being concentrated three times, enters the triple-effect heater 10 of the evaporator crystallizer under the action of the double-effect transfer pump 9. Inside the triple-effect heater 10, the solution is heated by the secondary steam evaporated from the double-effect evaporator crystallizer 8, causing the tryptophan solution to heat up. The steam entering the triple-effect heater 10 cools down and condenses into condensate. Under the action of the triple-effect circulation pump 12, the heated tryptophan solution enters the triple-effect separator 11, where the solution undergoes gas-liquid separation. The separated secondary steam enters the condenser 14, and the separated solution flows out from the outlet of the triple-effect separator 11. Under the action of the triple-effect circulation pump 12, it re-enters the triple-effect heater 10 for heating. This cycle repeats, and the triple-effect evaporator crystallizer performs a fourth evaporation, concentration, and crystallization of the tryptophan solution, increasing its concentration for the fourth time to form a crystal slurry. When the discharge pump 13 is started, part of the crystal slurry flowing out of the discharge port of the triple-effect separator 11 enters the triple-effect discharge pipeline under the action of the discharge pump 13. The discharge mass density meter 28 on the triple-effect discharge pipeline monitors the concentration of the crystal slurry. When the concentration of the crystal slurry is lower than the discharge concentration, the crystal slurry enters the triple-effect return pipeline along the triple-effect discharge pipeline, and then re-enters the triple-effect evaporator crystallizer. Under the action of the triple-effect circulation pump 12, it continues to evaporate, crystallize and concentrate. When the concentration of the crystal slurry monitored by the discharge mass density meter 28 reaches the discharge concentration requirement, the discharge mass density meter 28 controls the discharge valve 25 to open, and under the action of the discharge pump 13, the crystal slurry is discharged from the discharge pipeline.

[0040] After the crystal slurry is discharged, the material level in the triple-effect separator 11 drops, and the triple-effect level gauge 39 controls the triple-effect feed valve 38 to open. The second-effect transfer pump 9 transports the tryptophan solution flowing out of the outlet of the second-effect evaporator crystallizer 8 into the triple-effect heater 10 along the triple-effect feed pipeline. After the second-effect evaporator crystallizer 8 discharges, the material level in the second-effect evaporator crystallizer 8 drops, and the second-effect level gauge 35 controls the second-effect feed valve 36 to open. The first-effect transfer pump B7 transports the tryptophan solution flowing out of the outlet of the first-effect evaporator crystallizer B6 into the second-effect evaporator crystallizer 8 along the second-effect feed pipeline. After the first-effect evaporator crystallizer B6 discharges, the material level in the first-effect evaporator crystallizer B6 drops, and the first-effect level gauge B3... 2. Control the opening of the first-effect feed valve B33. The first-effect conveying pump A5 delivers the tryptophan solution flowing out of the outlet of the first-effect evaporator crystallizer A4 into the first-effect evaporator crystallizer B6 along the first-effect feed pipeline B. After the first-effect evaporator crystallizer A4 discharges, the material level in the first-effect evaporator crystallizer A4 drops. The first-effect level gauge A29 controls the opening of the first-effect feed valve A30. The feed pump 3 delivers the low-concentration tryptophan solution into the first-effect evaporator crystallizer A4 along the first-effect feed pipeline A. The feed valves of each effect are interlocked with the corresponding level gauges. By controlling the opening and closing of the feed valves through the material level in the evaporator crystallizer, the material level in the evaporator crystallizer can be kept constant, realizing automatic control of the evaporation feed.

[0041] The secondary steam separated by the triple-effect separator 11 enters the condenser 14, where it is condensed and cooled. The water vapor in the secondary steam is condensed into water, and the non-condensable gases in the secondary steam are cooled and then discharged by the vacuum pump 15.

[0042] The condensate in the first-effect evaporator crystallizer A4, the first-effect evaporator crystallizer B6, the second-effect evaporator crystallizer 8, the condensate in the triple heater 10 of the triple evaporator crystallizer, and the condenser 14 are stored in the condensate tank 16 through pipelines. The condensate pump 17 is started and the condensate drain valve 19 is opened. The condensate in the condensate tank 16 is discharged from the condensate drain pipeline under the action of the condensate pump 17.

[0043] The non-condensable gas and condensate flash steam flowing out of the first-effect evaporator crystallizer A4 and the first-effect evaporator crystallizer B6 enter the second-effect evaporator crystallizer 8. Together with the secondary steam entering the second-effect evaporator crystallizer 8, they heat the tryptophan solution, thereby realizing the recovery and utilization of the heat in the non-condensable gas and condensate flash steam flowing out of the first-effect evaporator crystallizer A4 and the first-effect evaporator crystallizer B6. The non-condensable gas and condensate flash steam flowing out of the second-effect evaporator crystallizer 8 enter the third-effect heater 10 of the third-effect evaporator crystallizer. Together with the secondary steam entering the third-effect heater 10, they heat the tryptophan solution, thereby realizing the recovery and utilization of the heat in the non-condensable gas and condensate flash steam flowing out of the second-effect evaporator crystallizer 8. The non-condensable gas and condensate flash steam flowing out of the third-effect heater 10 enter the condenser 14, are cooled by cooling water, and then discharged.

[0044] When the system experiences slight scaling or reaches the scheduled cleaning cycle, close the material valve 22 and feed pump 3, close the steam valve 58 and steam ejector 20, close the discharge valve 25, and open the return valve 26. The remaining tryptophan solution in the system returns to the raw material tank 1 along the return pipeline under the action of the discharge pump 13. Then, close the return valve 26 and open the cleaning valve 23 and cleaning drain valve 27. The cleaning water in the cleaning water tank 2 enters the system under the action of the feed pump 3 to clean the pipelines and evaporator crystallizer in the system. Under the action of the discharge pump 13, the cleaning water returns to the cleaning water tank 2 along the cleaning drain pipeline. After cleaning, open the following valves: first-effect upper flush valve A41, first-effect upper flush valve B42, second-effect upper flush valve 43, third-effect upper flush valve 44, first-effect lower flush valve A45, first-effect lower flush valve B46, second-effect lower flush valve 47, third-effect lower flush valve 48, first-effect drain valve A49, first-effect drain valve B51, second-effect drain valve 52, third-effect drain valve 53, and condensate drain valve 54. The hot flushing water in the flushing tank 40 flushes the system along the pipeline. The flushing water then enters the sewage treatment system along the main drain pipe 50.

[0045] In this embodiment, a triple-effect separator 11 is equipped with a triple-effect pressure sensor 55 for monitoring its internal pressure. The pipeline connecting the outlet of the condenser 14 and the inlet of the vacuum pump 15 is connected to a pressure regulating pipeline, which is open to the atmosphere. A pressure regulating valve 56 is installed on the pressure regulating pipeline, and the triple-effect pressure sensor 55 is electrically connected to the pressure regulating valve 56. The pressure regulating valve 56 is adjusted by controlling the pressure inside the triple-effect separator 11. The pressure inside the triple-effect separator 11 is monitored by the triple-effect pressure sensor 55, which reflects the vacuum level in the system. When the pressure is lower than the set value, the pressure regulating valve 56 is opened, and outside air enters the system through the pressure regulating pipeline, increasing the system pressure and thus maintaining a stable system pressure.

[0046] It should be noted that the above embodiments are illustrative of the technical solutions of the present invention and not limiting. Equivalent substitutions or other modifications made by those skilled in the art based on the prior art, as long as they do not exceed the concept and scope of the technical solutions of the present invention, should be included within the scope of the claims of the present invention.

Claims

1. A tryptophan TVR evaporation, concentration, and crystallization system, characterized in that: The system includes a single-effect evaporator crystallizer A (4), a single-effect evaporator crystallizer B (6), a double-effect evaporator crystallizer (8), and a triple-effect evaporator crystallizer connected in series along the material flow direction. The single-effect evaporator crystallizer A (4), the single-effect evaporator crystallizer B (6), and the double-effect evaporator crystallizer (8) are all centrally circulating tube evaporators, while the triple-effect evaporator crystallizer is a forced-circulation evaporator crystallizer. The inlet of the first-effect evaporator crystallizer A (4) is connected to the outlet of the feed pump (3), and the inlet of the feed pump (3) is connected to the raw material tank (1) storing low-concentration tryptophan. The outlet of the third-effect evaporator crystallizer is connected to the inlet of the discharge pump (13), and the outlet of the discharge pump (13) is connected to the third-effect discharge pipeline. The inlet of the first-effect evaporator crystallizer A (4) and the inlet of the first-effect evaporator crystallizer B (6) are connected to the outlet of the steam ejector (20). The secondary steam outlet of the first-effect evaporator crystallizer A (4) and the secondary steam outlet of the first-effect evaporator crystallizer B (6) are connected to the first-effect secondary steam pipeline. The first-effect secondary steam pipeline is connected to the suction port of the steam ejector (20) and the inlet of the second-effect evaporator crystallizer (8). The secondary steam outlet of the second-effect evaporator crystallizer (8) is connected to the inlet of the third-effect evaporator crystallizer. The secondary steam outlet of the third-effect evaporator crystallizer is connected to the inlet of the condenser (14). The outlet of the condenser (14) is connected to the inlet of the vacuum pump (15). The outlet of the vacuum pump (15) is vented. The inlet of the steam ejector (20) is connected to the steam source (21) through the live steam pipeline.

2. The tryptophan TVR evaporation concentration and crystallization system according to claim 1, characterized in that: The triple-effect evaporator crystallizer includes a triple-effect heater (10), a triple-effect separator (11), and a triple-effect circulating pump (12). The inlet of the triple-effect circulating pump (12) is connected to the triple-effect feed pipeline, the outlet of the triple-effect circulating pump (12) is connected to the inlet of the triple-effect heater (10), the outlet of the triple-effect heater (10) is connected to the inlet of the triple-effect separator (11), the outlet of the triple-effect separator (11) is connected to the inlet of the triple-effect circulating pump (12) and the inlet of the discharge pump (13), and a triple-effect discharge valve is provided on the pipeline connecting the outlet of the triple-effect separator (11) and the inlet of the discharge pump (13).

3. The tryptophan TVR evaporation concentration and crystallization system according to claim 2, characterized in that: The triple-effect separator (11) is equipped with a triple-effect level gauge (39) for monitoring the material level inside. A triple-effect feed valve (38) is installed on the triple-effect feed pipe. The triple-effect level gauge (39) is electrically connected to the triple-effect feed valve (38). The triple-effect feed valve (38) is adjusted by controlling the material level inside the triple-effect separator (11). The triple-effect discharge pipe is connected to the triple-effect return pipe, discharge pipe, return pipe and cleaning drainage pipe. A triple-effect return valve (24) is installed on the triple-effect return pipe. A discharge valve (25) is installed on the discharge pipe. A return valve (26) is installed on the return pipe. A cleaning drainage valve (27) is installed on the cleaning drainage pipe. A discharge mass density meter (28) for monitoring the concentration of crystal slurry after evaporation and crystallization is installed on the triple-effect discharge pipe. The discharge mass density meter (28) is electrically connected to the discharge valve (25). The discharge valve (25) is adjusted by controlling the concentration of crystal slurry.

4. The tryptophan TVR evaporation concentration and crystallization system according to claim 1, characterized in that: The inlet of the feed pump (3) is connected to the raw material tank (1) storing low concentration tryptophan through a material pipeline. A material valve (22) is provided on the material pipeline. The inlet of the feed pump (3) is connected to the cleaning water tank (2) through a cleaning pipeline. A cleaning valve (23) is provided on the cleaning pipeline.

5. The tryptophan TVR evaporation concentration and crystallization system according to claim 1, characterized in that: The inlet of the first-effect evaporator crystallizer A (4) is connected to the outlet of the feed pump (3) through the first-effect feed pipeline A. The first-effect evaporator crystallizer A (4) is equipped with a first-effect level gauge A (29) for monitoring the material level inside. The first-effect feed pipeline A is equipped with a first-effect feed valve A (30). The first-effect level gauge A (29) is electrically connected to the first-effect feed valve A (30). The first-effect feed valve A (30) is adjusted by controlling the material level inside the first-effect evaporator crystallizer A (4). The outlet of the first-effect evaporator crystallizer A (4) is connected to the inlet of the first-effect conveying pump A (5). The outlet of the first-effect conveying pump A (5) is connected to the first-effect return pipeline A and the first-effect feed pipeline B. The first-effect return pipeline A is equipped with a first-effect return valve A (31).

6. The tryptophan TVR evaporation concentration and crystallization system according to claim 5, characterized in that: The outlet of the first-effect conveying pump A (5) is connected to the inlet of the first-effect evaporator crystallizer B (6) through the first-effect feed pipe B. The first-effect evaporator crystallizer B (6) is equipped with a first-effect level gauge B (32) for monitoring the material level inside. The first-effect feed pipe B is equipped with a first-effect feed valve B (33). The first-effect level gauge B (32) is electrically connected to the first-effect feed valve B (33). The first-effect feed valve B (33) is adjusted by controlling the material level inside the first-effect evaporator crystallizer B (6). The outlet of the first-effect evaporator crystallizer B (6) is connected to the inlet of the first-effect conveying pump B (7). The outlet of the first-effect conveying pump B (7) is connected to the first-effect return pipe B and the second-effect feed pipe. The first-effect return pipe B is equipped with a first-effect return valve B (34).

7. The tryptophan TVR evaporation concentration and crystallization system according to claim 6, characterized in that: The outlet of the first-effect conveying pump B (7) is connected to the inlet of the second-effect evaporator crystallizer (8) through the second-effect feed pipeline. The second-effect evaporator crystallizer (8) is equipped with a second-effect level gauge (35) for monitoring the material level inside. A second-effect feed valve (36) is installed on the second-effect feed pipeline. The second-effect level gauge (35) is electrically connected to the second-effect feed valve (36). The second-effect feed valve (36) is adjusted by controlling the material level inside the second-effect evaporator crystallizer (8). The outlet of the second-effect evaporator crystallizer (8) is connected to the inlet of the second-effect conveying pump (9). The outlet of the second-effect conveying pump (9) is connected to the second-effect return pipeline and the third-effect feed pipeline. A second-effect return valve (37) is installed on the second-effect return pipeline.

8. The tryptophan TVR evaporation concentration and crystallization system according to claim 1, characterized in that: The flushing port of the first-effect evaporator crystallizer A (4) is connected to the flushing tank (40) through the first-effect upper flushing pipe A, and the first-effect upper flushing valve A (41) is installed on the first-effect upper flushing pipe A. The flushing port of the first-effect evaporator crystallizer B (6) is connected to the flushing tank (40) through the first-effect upper flushing pipe B, and the first-effect upper flushing valve B (42) is installed on the first-effect upper flushing pipe B. The flushing port of the second-effect evaporator crystallizer (8) is connected to the flushing tank (40) through the second-effect upper flushing pipe, and the second-effect upper flushing valve (43) is installed on the second-effect upper flushing pipe. The flushing port of the third-effect separator (11) of the third-effect evaporator crystallizer is connected to the flushing tank (40) through the third-effect upper flushing pipe, and the third-effect upper flushing valve (43) is installed on the third-effect upper flushing pipe. The inlet of the first-effect conveying pump A (5) is connected to the flushing tank (40) through the first-effect lower flushing pipeline A. The first-effect lower flushing pipeline A is equipped with a first-effect lower flushing valve A (45). The inlet of the first-effect conveying pump B (7) is connected to the flushing tank (40) through the first-effect lower flushing pipeline B. The first-effect lower flushing pipeline B is equipped with a first-effect lower flushing valve B (46). The inlet of the second-effect conveying pump (9) is connected to the flushing tank (40) through the second-effect lower flushing pipeline. The second-effect lower flushing pipeline is equipped with a second-effect lower flushing valve (47). The inlet of the discharge pump (13) is connected to the flushing tank (40) through the third-effect lower flushing pipeline. The third-effect lower flushing pipeline is equipped with a third-effect lower flushing valve (48).

9. The tryptophan TVR evaporation concentration and crystallization system according to claim 1, characterized in that: The outlet of the first-effect evaporator crystallizer A (4) is connected to the main drain pipe (50) through the first-effect drain pipe A. The first-effect drain pipe A is equipped with a first-effect drain valve A (49). The outlet of the first-effect evaporator crystallizer B (6) is connected to the main drain pipe (50) through the first-effect drain pipe B. The first-effect drain pipe B is equipped with a first-effect drain valve B (51). The outlet of the second-effect evaporator crystallizer (8) is connected to the main drain pipe (50) through the second-effect drain pipe. The second-effect drain pipe is equipped with a second-effect drain valve (52). The outlet of the third-effect separator (11) of the third-effect evaporator crystallizer is connected to the main drain pipe (50) through the third-effect drain pipe. The third-effect drain pipe is equipped with a third-effect drain valve (53).

10. The tryptophan TVR evaporation concentration and crystallization system according to any one of claims 1 to 9, characterized in that: The first-effect evaporator crystallizer A (4), the first-effect evaporator crystallizer B (6), and the second-effect evaporator crystallizer (8) are all central circulation tube evaporators, including a tank (101), an intermediate tube (102), a heating tube (103), an upper baffle (104), and a lower baffle (105). The lower part of the tank (101) is provided with an upper baffle (104) and a lower baffle (105) arranged vertically, and the intermediate tube (102) is provided at the center of the lower part of the tank (101). The upper partition (104) and lower partition (105) are fixedly connected to the upper and lower ends of the intermediate tube (102), respectively. The upper partition (104), lower partition (105) and intermediate tube (102) divide the inner cavity of the tank (101) into a separation chamber (106), a heating chamber (107), and a circulation chamber (108). The separation chamber (106) is the inner cavity above the upper partition (104) inside the tank (101), and the heating chamber (107) is the inner cavity above the upper partition (104) inside the tank (101). 101) The cavity formed by the lower inner wall, the outer wall of the intermediate tube (102), the upper partition (104), and the lower partition (105), the circulation chamber (108) is the inner cavity of the tank (101) below the inner cavity of the intermediate tube (102) and the lower partition (105), the heating chamber (107) is provided with a heating tube (103), the upper and lower ends of the heating tube (103) are fixedly connected to the upper partition (104) and the lower partition (105) respectively, and the heating tube (101) is fixedly connected to the upper partition (104) and the lower partition (105) respectively. 3) The separation chamber (106) above the upper partition (104) of the tank body (101) and the circulation chamber (108) below the lower partition (105) are connected. The upper end of the separation chamber (106) is provided with a secondary steam outlet, and the lower part of the separation chamber (106) is provided with a feed inlet and a return outlet. The heating chamber (107) is provided with an air inlet, a condensate outlet and a non-condensable gas outlet that are connected to the heating chamber (107). The lower end of the tank body (101) is provided with a discharge outlet.

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