Evaporation device for extracting valine through corn deep processing

Abstract

The utility model discloses an evaporation device for extracting valine from corn deep processing. An outlet of a feed pump is connected with a feed port of a first-effect forced separator sequentially through a two-stage condensate water preheater and a cold side of a third-effect non-condensable gas preheater; a bottom circulating outlet of the first-effect forced separator is connected with a side wall circulating inlet of the first-effect forced separator through a first-effect forced circulating pump and a tube pass of a first-effect forced evaporator; an outlet pipe of the first-effect evaporator is further connected with a second-effect material liquid circulating pipe through a first-effect material transferring pipe, an outlet pipe of the second-effect evaporator is further connected with a third-effect evaporation material liquid circulating pipe through a second-effect material transferring pipe, and a salt leg outlet in the bottom of a third-effect forced separator is connected with a feeding port of a fourth-effect forced separator through a third-effect material transferring pump and a third-effect material transferring pipe; a circulating liquid outlet of the quadruple-effect forced separator circulates through a quadruple-effect forced circulating pump and a tube pass of the quadruple-effect forced evaporator; and a salt leg outlet at the bottom of the quadruple-effect forced separator is connected with a discharging pump. The device can improve the yield and quality of valine and reduce production energy consumption at the same time.

Description

Technical Field

[0001] This utility model relates to an evaporation device, and more particularly to an evaporation device for extracting valine from corn, belonging to the technical field of evaporation and purification equipment. Background Technology

[0002] Valine is an important amino acid widely used in medicine, chemicals, and food. The application of less common amino acids in animal feed is on the rise, and the market demand for valine is continuously increasing, indicating significant market potential. Therefore, improving production efficiency, reducing costs, minimizing energy consumption, and reducing environmental pollution are key issues that need to be addressed and resolved in the future.

[0003] Valine extraction methods mainly include enzymatic methods, hydrolysis, synthesis, and fermentation. Due to the advantages of low raw material costs, mild reaction conditions, and ease of large-scale production, microbial fermentation is the primary method for valine production. Currently, the technology for valine production via microbial fermentation in my country is still immature. Optimizing fermentation technology to improve yield and efficiency, promoting green production processes to reduce environmental impact, and introducing automation and intelligent technologies to enhance production are important research directions. In the entire production process, the evaporation, concentration, and crystallization process is crucial in affecting product quality and energy consumption. Existing evaporation, concentration, and crystallization systems suffer from problems such as severe mist entrainment during evaporation, high energy consumption, insufficient waste heat utilization, temperature instability leading to amino acid denaturation, and substandard quality.

[0004] Chinese patent application CN 103540641A discloses a method for producing L-valine. The method involves obtaining a fermentation broth for valine through fermentation and separation purification. The fermentation broth is then filtered through a microfiltration membrane, and the microfiltrate is evaporated, concentrated, and crystallized to obtain a crude product. The crude product is dissolved in water and then subjected to ion exchange through a strong acid ion exchange resin. The effluent is filtered through an ultrafiltration membrane, and the filtrate is vacuum concentrated and crystallized to obtain the final product. This method involves a strong acid ion exchange column separation process, but it generates a large amount of acidic and alkaline wastewater, causing environmental pollution. Furthermore, the process is costly and economically inefficient.

[0005] Patent CN 110092728B discloses a valine two-effect concentration and crystallization system and a method for concentration and crystallization using this system. The system includes a first-effect heater, a first-effect crystallizer, a second-effect heater, a second-effect crystallizer, a condenser, a feed pump, and a condensate tank. The entire process is completed through vacuuming, feeding, steam introduction, condensate discharge, replenishment, discharge, and cleaning. This technical solution uses a two-effect evaporation system for concentration and crystallization. However, the two-effect evaporation system has limited requirements for the amount of feed material and has relatively low energy efficiency. Utility Model Content

[0006] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0007] In view of the problems existing in the above and / or prior art, this utility model is proposed.

[0008] The purpose of this invention is to overcome the problems existing in the prior art and provide a corn deep processing valine extraction evaporation device that improves the yield and quality of valine, achieves efficient and continuous production, and reduces production energy consumption.

[0009] To solve the above technical problems, this utility model provides a corn deep processing valine extraction evaporation device, which includes a feed pump. The outlet of the feed pump is connected to the inlet of a first-effect forced separator via a primary condensate preheater, a secondary condensate preheater, a tertiary non-condensable gas preheater, a second-effect non-condensable gas preheater, and the cold side of a first-effect non-condensable gas preheater. The bottom circulation outlet of the first-effect forced separator is connected to the inlet of a first-effect forced circulation pump. The outlet of the first-effect forced circulation pump is connected to the tube-side inlet of the first-effect forced evaporator. The tube-side outlet of the first-effect forced evaporator is connected to the side wall circulation inlet of the first-effect forced separator via the outlet pipe of the first-effect evaporator.

[0010] The outlet pipe of the first-effect evaporator is also connected to the middle of the second-effect liquid circulation pipe through the first-effect transfer pipe. The upper end of the second-effect liquid circulation pipe is connected to the bottom circulation liquid outlet of the second-effect forced separator. The lower end outlet of the second-effect liquid circulation pipe is connected to the tube-side inlet of the second-effect forced evaporator through the second-effect forced circulation pump. The tube-side outlet of the second-effect forced evaporator is connected to the side wall circulation liquid inlet of the second-effect forced separator through the outlet pipe of the second-effect evaporator.

[0011] The outlet pipe of the second-effect evaporator is also connected to the middle of the third-effect evaporator liquid circulation pipe through the second-effect transfer pipe. The upper inlet of the third-effect evaporator liquid circulation pipe is connected to the circulation outlet of the third-effect forced separator. The lower outlet of the third-effect evaporator liquid circulation pipe is connected to the circulation inlet of the third-effect forced separator through the third-effect forced circulation pump and the tube side of the third-effect forced evaporator. The bottom salt leg outlet of the third-effect forced separator is connected to the inlet of the fourth-effect forced separator through the third-effect transfer pump and the third-effect transfer pipe.

[0012] The circulating liquid outlet of the four-effect forced separator is connected to the circulating liquid inlet of the four-effect forced separator via the tube side of the four-effect forced circulation pump and the four-effect forced evaporator. The bottom salt leg outlet of the four-effect forced separator is connected to the discharge pipe via the discharge pump.

[0013] As an improvement of this utility model, the shell-side exhaust port of the first-effect forced evaporator is connected to the hot-side inlet of the first-effect non-condensable gas preheater, the hot-side outlet of the first-effect non-condensable gas preheater is connected to the middle inlet of the first-effect non-condensable gas condensate tank, the bottom drain port of the first-effect non-condensable gas condensate tank is connected to the bottom inlet of the shell side of the first-effect forced evaporator, the shell-side evaporation water outlet of the first-effect forced evaporator is connected to the inlet of the primary evaporation water tank, the outlet of the primary evaporation water tank is connected to the inlet of the primary evaporation water pump, the outlet of the primary evaporation water pump is connected to the hot-side inlet of the primary condensate preheater, and the hot-side outlet of the primary condensate preheater is connected to the primary evaporation water output pipe.

[0014] As a further improvement of this utility model, the top secondary steam outlet of the first-effect forced separator is connected to the shell-side inlet of the second-effect forced evaporator via a first-effect demister; the top exhaust port of the first-effect non-condensable gas condensate tank is also connected to the shell-side inlet of the second-effect forced evaporator; the shell-side exhaust port of the second-effect forced evaporator is connected to the hot-side inlet of the second-effect non-condensable gas preheater; the hot-side outlet of the second-effect non-condensable gas preheater is connected to the middle inlet of the second-effect non-condensable gas condensate tank; the exhaust port of the second-effect non-condensable gas condensate tank is connected to the shell-side inlet of the third-effect forced evaporator; the bottom outlet of the second-effect non-condensable gas condensate tank is connected to the bottom shell-side inlet of the second-effect forced evaporator; and the shell-side evaporated water outlet of the second-effect forced evaporator is connected to the bottom shell-side inlet of the third-effect forced evaporator.

[0015] As a further improvement of this utility model, the shell-side non-condensable gas outlet of the triple-effect forced evaporator is connected to the hot-side inlet of the triple-effect non-condensable gas preheater, the hot-side outlet of the triple-effect non-condensable gas preheater is connected to the middle inlet of the triple-effect non-condensable gas condensate tank, and the bottom outlet of the triple-effect non-condensable gas condensate tank is connected to the secondary distilled water tank; the shell-side distilled water outlet of the triple-effect forced evaporator is also connected to the secondary distilled water tank.

[0016] As a further improvement of this utility model, the top secondary steam outlet of the double-effect forced separator is connected to the shell-side inlet of the triple-effect forced evaporator through a double-effect demister; the top secondary steam outlet of the triple-effect forced separator is connected to the secondary distilled water tank through a triple-effect demister.

[0017] As a further improvement of this utility model, the bottom outlet of the secondary evaporation water tank is connected to the inlet of the secondary evaporation water pump, the outlet of the secondary evaporation water pump is connected to the hot side inlet of the secondary condensate preheater, and the hot side outlet of the secondary condensate preheater is connected to the inlet of the surface cooler evaporation water tank through the secondary evaporation water output pipe.

[0018] As a further improvement of this utility model, the shell-side evaporation outlet of the four-effect forced evaporator is connected to the inlet of the evaporation tank of the surface cooler; the shell-side non-condensable gas outlet of the four-effect forced evaporator and the top exhaust port of the four-effect forced separator are both connected to the inlet of the four-effect demister; the outlet of the four-effect demister is connected to the inlet of the composite air cooler; the outlet of the composite air cooler is connected to the hot-side inlet of the secondary surface cooler; the hot-side outlet of the secondary surface cooler is connected to the middle inlet of the condensate tank of the secondary surface cooler; the top exhaust port of the evaporation tank of the surface cooler is also connected to the middle inlet of the condensate tank of the secondary surface cooler; the top outlet of the condensate tank of the secondary surface cooler is connected to the inlet of the vacuum pump; the bottom drain of the condensate tank of the secondary surface cooler is connected to the inlet of the evaporation tank of the surface cooler through a water trap; the bottom outlet of the evaporation tank of the surface cooler is connected to the inlet of the evaporation water pump of the surface cooler; and the outlet of the evaporation water pump of the surface cooler is connected to the evaporation water output pipe of the surface cooler.

[0019] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. By adopting the form of four-effect forced circulation evaporation and crystallization, the waste heat of secondary steam is fully utilized. The secondary steam after heating in the previous effect can be used as the heating steam for the next effect. All secondary steam can be recovered. Compared with traditional evaporation devices, energy consumption is reduced by about 40%.

[0020] 2. The design incorporates external demisters for each effect, with built-in spray nozzles to prevent secondary steam from carrying large amounts of liquid droplets containing dissolved amino acids. An automated control system is adopted, and a water supply valve is installed, making operation simple and requiring only a small number of personnel to achieve normal operation and maintenance of the equipment. At the same time, the equipment has automatic cleaning and automatic sewage discharge functions, reducing the labor intensity of operators.

[0021] 3. The form of crystallizer should be selected according to the initial concentration of valine. The third and fourth effect evaporation crystallizers adopt the salt leg design, which uses the principle of gravity sedimentation to allow the fine salt particles to continue to circulate and grow in the crystallizer, which is conducive to the improvement of salt quality, increases the composition and concentration of salt crystals leaving the system, and improves the quality of crystallized products and the particle size of crystal particles.

[0022] 4. Non-condensable steam is used to exchange heat with the conveyed material. The heat contained in the non-condensable steam is transferred to the material. The heat of the non-condensable steam is used to preheat the material, recovering waste heat and solving the heat loss caused by the direct discharge of non-condensable steam.

[0023] 5. A composite condenser is adopted, which uses air to condense the secondary steam in the last effect. Ambient air is used as the cooling medium, sweeping across the outside of the finned tubes to condense the secondary steam inside the tubes. Using an air cooler instead of a water cooler for condensing the medium can not only save water but also reduce water pollution. In addition, it also has the advantages of saving electricity and eliminating fog. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0025] Figure 1 This is a flowchart of the evaporation device for deep processing of corn to extract valine according to this utility model;

[0026] In the diagram: 1. Primary condensate preheater; 2. Primary evaporation tank; 3. First-effect forced evaporator; 4. First-effect forced separator; 5. First-effect demister; 6. First-effect non-condensable gas preheater; 7. First-effect non-condensable gas condensate tank; 8. Second-effect forced evaporator; 9. Second-effect forced separator; 10. Second-effect demister; 11. Second-effect non-condensable gas preheater; 12. Second-effect non-condensable gas condensate tank; 13. Third-effect forced evaporator; 14. Triple-effect forced separator; 15. Triple-effect demister; 16. Secondary evaporation water tank; 17. Secondary condensate preheater; 18. Triple-effect non-condensable gas preheater; 19. Triple-effect non-condensable gas condensate tank; 20. Quadruple-effect forced evaporator; 21. Quadruple-effect forced separator; 22. Quadruple-effect demister; 23. Composite air cooler; 24. Secondary surface cooler; 25. Secondary surface cooler condensate tank; 26. Surface cooler evaporation water tank;

[0027] G1. Feed pipe; G2. Feed circulation pipe for first-effect evaporator; G3. Outlet pipe for first-effect evaporator; G4. Transfer pipe for first-effect evaporator; G5. Feed circulation pipe for second-effect evaporator; G6. Outlet pipe for second-effect evaporator; G7. Transfer pipe for second-effect evaporator; G8. Feed circulation pipe for third-effect evaporator; G9. Outlet pipe for third-effect evaporator; G10. Transfer pipe for third-effect evaporator; G11. Feed circulation pipe for fourth-effect evaporator; G12. Outlet pipe for fourth-effect evaporator; G13. Discharge pipe; G14. Primary evaporation water output pipe; G15. Secondary evaporation water output pipe; G16. Evaporation water output pipe for surface cooler; G17. Live steam pipe; G18. Secondary steam pipe for first-effect evaporator; G19. Secondary steam pipe for second-effect evaporator; G20. Secondary steam pipe for third-effect evaporator; G21. Secondary steam pipe for fourth-effect evaporator; G22. Circulating water pipe for second-stage surface cooler;

[0028] B1. Feed pump; B2. Primary distillation water pump; B3. Single-effect forced circulation pump; B4. Double-effect forced circulation pump; B5. Triple-effect forced circulation pump; B6. Triple-effect transfer pump; B7. Secondary distillation water pump; B8. Quadruple-effect forced circulation pump; B9. Discharge pump; B10. Surface cooler distillation water pump; B11. Emergency discharge pump; B12. Vacuum pump. Detailed Implementation

[0029] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0031] like Figure 1 As shown, the corn deep processing valine extraction evaporation device of this utility model includes a first-effect forced evaporator 3, a first-effect forced separator 4, a second-effect forced evaporator 8, a second-effect forced separator 9, a third-effect forced evaporator 13, a third-effect forced separator 14, a fourth-effect forced evaporator 20, and a fourth-effect forced separator 21.

[0032] The outlet of the feed pipe G1 is connected to the inlet of the feed pump B1. The outlet of the feed pump B1 is connected to the cold-side inlet of the primary condensate preheater 1. The cold-side outlet of the primary condensate preheater 1 is connected to the cold-side inlet of the secondary condensate preheater 17. The cold-side outlet of the secondary condensate preheater 17 is connected to the cold-side inlet of the triple-effect non-condensable gas preheater 18. The cold-side outlet of the triple-effect non-condensable gas preheater 18 is connected to the cold-side inlet of the second-effect non-condensable gas preheater 11. The cold-side outlet of the second-effect non-condensable gas preheater 11... The outlet is connected to the cold side inlet of the first-effect non-condensable gas preheater 6, the cold side outlet of the first-effect non-condensable gas preheater 6 is connected to the feed inlet of the first-effect forced separator 4, the bottom circulation outlet of the first-effect forced separator 4 is connected to the inlet of the first-effect forced circulation pump B3 through the first-effect liquid circulation pipe G2, the outlet of the first-effect forced circulation pump B3 is connected to the tube side inlet of the first-effect forced evaporator 3, and the tube side outlet of the first-effect forced evaporator 3 is connected to the side wall circulation inlet of the first-effect forced separator 4 through the first-effect evaporator outlet pipe G3.

[0033] The shell-side exhaust port of the first-effect forced evaporator 3 is connected to the hot-side inlet of the first-effect non-condensable gas preheater 6. The hot-side outlet of the first-effect non-condensable gas preheater 6 is connected to the middle inlet of the first-effect non-condensable gas condensate tank 7. The bottom drain port of the first-effect non-condensable gas condensate tank 7 is connected to the bottom inlet of the shell side of the first-effect forced evaporator 3. The shell-side evaporation water outlet of the first-effect forced evaporator 3 is connected to the inlet of the primary evaporation water tank 2. The outlet of the primary evaporation water tank 2 is connected to the inlet of the primary evaporation water pump B2. The outlet of the primary evaporation water pump B2 is connected to the hot-side inlet of the primary condensate preheater 1. The hot-side outlet of the primary condensate preheater 1 is connected to the primary evaporation water output pipe G14.

[0034] The raw corn is fermented, coated, decolorized, and purified to obtain a valine solution. To improve purity and quality, the extracted valine solution with a concentration of about 39% at 50-60℃ is sequentially preheated by a primary condensate preheater 1, a secondary condensate preheater 17, a triple-effect non-condensable gas preheater 18, a second-effect non-condensable gas preheater 11, and a first-effect non-condensable gas preheater 6, effectively recovering the heat from the condensate and non-condensable gas. After preheating, the valine solution enters a first-effect forced separator 4 for first-effect evaporation and separation, increasing the material concentration from 8.8% to 11%.

[0035] 0.3 MPa, 144°C raw steam is introduced into the shell side of the first-effect forced evaporator 3 through the raw steam pipe G17 as a heat source to heat the circulating feed liquid, and the temperature of the first-effect secondary steam flashed out of the first-effect forced separator 4 drops to 87°C.

[0036] The outlet pipe G3 of the first-effect evaporator is also connected to the middle of the second-effect feed liquid circulation pipe G5 through the first-effect transfer pipe G4. The upper inlet of the second-effect feed liquid circulation pipe G5 is connected to the bottom circulation liquid outlet of the second-effect forced separator 9. The lower outlet of the second-effect feed liquid circulation pipe G5 is connected to the inlet of the second-effect forced circulation pump B4. The outlet of the second-effect forced circulation pump B4 is connected to the tube-side inlet of the second-effect forced evaporator 8. The tube-side outlet of the second-effect forced evaporator 8 is connected to the side wall circulation liquid inlet of the second-effect forced separator 9 through the outlet pipe G6 of the second-effect evaporator.

[0037] The top secondary steam outlet of the first-effect forced separator 4 is connected to the inlet of the first-effect demister 5. The outlet of the first-effect demister 5 is connected to the shell-side inlet of the second-effect forced evaporator 8 through the first-effect secondary steam pipe G18. The top exhaust port of the first-effect non-condensable condensate tank 7 is also connected to the shell-side inlet of the second-effect forced evaporator 8.

[0038] The shell-side exhaust port of the double-effect forced evaporator 8 is connected to the hot-side inlet of the double-effect non-condensable gas preheater 11, the hot-side outlet of the double-effect non-condensable gas preheater 11 is connected to the middle inlet of the double-effect non-condensable gas condensate tank 12, the bottom outlet of the double-effect non-condensable gas condensate tank 12 is connected to the bottom inlet of the shell side of the double-effect forced evaporator 8, and the shell-side evaporated water outlet of the double-effect forced evaporator 8 is connected to the bottom inlet of the shell side of the triple-effect forced evaporator 13.

[0039] The secondary steam generated by the first-effect forced evaporation is defoamed by the first-effect demister 5 and then enters the shell side of the second-effect forced evaporator 8 as the heat source for the second-effect forced evaporation. The concentrated liquid from the first effect is transferred to the second-effect feed circulation pipe G5 through the first-effect transfer pipe G4 by the pressure difference. It is then sent to the tube side of the second-effect forced evaporator 8 by the second-effect forced circulation pump B4 for heating, and then enters the second-effect forced separator 9 for second-effect evaporation and separation. The concentration of the material in the second effect increases from 11% to 15%, and the temperature of the secondary steam from the flash evaporation in the second effect drops to 77°C.

[0040] The non-condensable gas discharged from the shell side of the double-effect forced evaporator 8 enters the hot side of the double-effect non-condensable gas preheater 11 to heat the feed liquid, and then enters the double-effect non-condensable gas condensate tank 12 for separation. The drainage from the double-effect non-condensable gas condensate tank 12 enters the shell side flash evaporator of the double-effect forced evaporator 8, and the water distilled from the shell side of the double-effect forced evaporator 8 enters the shell side flash evaporator of the triple-effect forced evaporator 13.

[0041] The outlet pipe G6 of the second-effect evaporator is also connected to the middle of the feed liquid circulation pipe G8 of the third-effect evaporator via the second-effect transfer pipe G7. The upper inlet of the feed liquid circulation pipe G8 of the third-effect evaporator is connected to the circulating liquid outlet of the third-effect forced separator 14, and the lower outlet of the feed liquid circulation pipe G8 of the third-effect evaporator is connected to the inlet of the third-effect forced circulation pump B5. The outlet of the third-effect forced circulation pump B5 is connected to the tube-side inlet of the third-effect forced evaporator 13, and the tube-side outlet of the third-effect forced evaporator 13 is connected to the circulating liquid inlet of the third-effect forced separator 14 via the outlet pipe G9 of the third-effect evaporator. The bottom of the third-effect forced separator 14 is provided with a salt leg, the outlet of which is connected to the inlet of the third-effect transfer pump B6, and the outlet of the third-effect transfer pump B6 is connected to the feed inlet of the fourth-effect forced separator 21 via the transfer pipe G10 of the third-effect evaporator.

[0042] The shell-side non-condensable gas outlet of the triple-effect forced evaporator 13 is connected to the hot-side inlet of the triple-effect non-condensable gas preheater 18, the hot-side outlet of the triple-effect non-condensable gas preheater 18 is connected to the middle inlet of the triple-effect non-condensable gas condensate tank 19, and the bottom outlet of the triple-effect non-condensable gas condensate tank 19 is connected to the secondary distilled water tank 16; the shell-side distilled water outlet of the triple-effect forced evaporator 13 is also connected to the secondary distilled water tank 16.

[0043] The top secondary steam outlet of the second-effect forced separator 9 is connected to the inlet of the second-effect demister 10. The outlet of the second-effect demister 10 is connected to the shell-side inlet of the third-effect forced evaporator 13 through the second-effect secondary steam pipe G19. The exhaust port of the second-effect non-condensable condensate tank 12 is also connected to the shell-side inlet of the third-effect forced evaporator 13.

[0044] The top secondary steam outlet of the triple-effect forced separator 14 is connected to the inlet of the triple-effect demister 15, and the outlet of the triple-effect demister 15 is connected to the secondary steam tank 16 through the triple-effect secondary steam pipe G20.

[0045] After being evaporated and concentrated by the triple-effect forced separator 14, the concentration of the triple-effect material increases from 15% to 24%. The temperature of the secondary steam generated by the forced evaporation of the triple-effect forced separator 14 drops to 67°C. After being defoamed by the secondary demister 10, it enters the shell side of the triple-effect forced evaporator 13 as the heat source for the triple-effect forced evaporation.

[0046] The shell-side non-condensable gas of the triple-effect forced evaporator 13 enters the hot side of the triple-effect non-condensable gas preheater 18 to preheat the feed liquid. The condensate generated after heat exchange enters the triple-effect non-condensable gas condensate tank 19 for flash evaporation. The flash steam from the triple-effect non-condensable gas condensate tank 19 also enters the shell side of the triple-effect forced evaporator 13 as a heat source. The condensate at the bottom enters the secondary distillation water tank 16 for collection.

[0047] The temperature of the triple-effect secondary steam generated by the forced evaporation of the triple-effect forced separator 14 drops to 55°C. After being defoamed by the triple-effect demister 15, it is connected to the secondary distillation water tank 16 through the triple-effect secondary steam pipe G20.

[0048] The circulating liquid outlet of the four-effect forced separator 21 is connected to the inlet of the four-effect forced circulation pump B8 via the four-effect evaporation feed circulation pipe G11. The outlet of the four-effect forced circulation pump B8 is connected to the tube-side inlet of the four-effect forced evaporator 20. The tube-side outlet of the four-effect forced evaporator 20 is connected to the circulating liquid inlet of the four-effect forced separator 21 via the four-effect evaporator outlet pipe G12. The bottom of the four-effect forced separator 21 is equipped with a salt leg. The outlet of the four-effect salt leg is connected to the inlet of the discharge pump B9, and the outlet of the discharge pump B9 is connected to the discharge pipe G13.

[0049] The bottom outlet of the secondary evaporation water tank 16 is connected to the inlet of the secondary evaporation water pump B7, the outlet of the secondary evaporation water pump B7 is connected to the hot side inlet of the secondary condensate preheater 17, and the hot side outlet of the secondary condensate preheater 17 is connected to the inlet of the surface cooler evaporation water tank 26 through the secondary evaporation water output pipe G15.

[0050] After being evaporated and concentrated by the four-effect forced separator 21, the concentration of the material in the four-effect separator increases from 24% to 52%. It is discharged from the salt leg of the four-effect separator and sent out by the discharge pump B9 through the discharge pipe G13.

[0051] The condensate discharged from the bottom of the secondary evaporation water tank 16 is sent by the secondary evaporation water pump B7 to the hot side of the secondary condensate water preheater 17 to preheat the liquid. After preheating, it enters the surface cooler evaporation water tank 26 through the secondary evaporation water output pipe G15 for collection.

[0052] The shell-side evaporator outlet of the four-effect forced evaporator 20 is connected to the inlet of the evaporator outlet tank 26 of the surface cooler; the shell-side non-condensable gas outlet of the four-effect forced evaporator 20 is connected to the inlet of the four-effect demister 22; the top exhaust port of the four-effect forced separator 21 is also connected to the inlet of the four-effect demister 22 via the four-effect secondary steam pipe G21; the outlet of the four-effect demister 22 is connected to the inlet of the combined air cooler 23; the outlet of the combined air cooler 23 is connected to the hot-side inlet of the secondary surface cooler 24; the cold side of the secondary surface cooler 24 is connected to the circulating water pipe G22 of the secondary surface cooler. The hot side outlet of the device 24 is connected to the middle inlet of the secondary surface cooler condensate tank 25. The top exhaust port of the surface cooler evaporation water tank 26 is also connected to the middle inlet of the secondary surface cooler condensate tank 25. The top outlet of the secondary surface cooler condensate tank 25 is connected to the inlet of the vacuum pump B12. The bottom drain of the secondary surface cooler condensate tank 25 is connected to the inlet of the surface cooler evaporation water tank 26 through a water trap. The bottom outlet of the surface cooler evaporation water tank 26 is connected to the inlet of the surface cooler evaporation water pump B10. The outlet of the surface cooler evaporation water pump B10 is connected to the surface cooler evaporation water output pipe G16.

[0053] The secondary steam evaporated by the four-effect forced evaporator 20 is de-misted by the four-effect demister 22 and then enters the composite air cooler 23. It first enters the upper finned tubes, cools down, and then flows into the lower water-spraying tubes. The exhaust steam transfers heat to the water film outside the tubes through the inner wall of the tubes and releases heat, then quickly condenses into liquid, reducing its volume and forming a negative pressure vacuum. To maintain the vacuum, the vacuum pump continuously extracts the air and non-condensable steam that leak into the condenser to prevent the accumulation of non-condensable gases in the condenser. The water film absorbs the heat of the high-temperature medium and transfers the heat to the air through vaporization, evaporation, and convection. The air becomes saturated after absorbing water. The saturated, hot, humid air passes over the surface of the upper finned air cooler and absorbs the heat of the medium inside the finned air cooler tubes. The temperature of the medium inside the finned tubes decreases, and at the same time, the temperature of the hot, humid air increases and becomes unsaturated. It is then discharged from the tower by the upper fan, eliminating the plume phenomenon. During winter operation, the bottom louvers are closed and the top louvers are opened, allowing cold air to directly enter the air cooler. This increases the air cooling capacity of the air cooler, saves water, eliminates fog, and prevents the bottom water spray area from freezing in winter.

[0054] The secondary steam generated by each evaporation effect enters the demister. Each demister is equipped with a built-in spray nozzle to clean the wire mesh demister, preventing the secondary steam from carrying a large amount of droplets containing dissolved valine. A pressure sensor is installed on the upper part of the wire mesh. As the system operates, if the amount of mist entrained on the wire mesh demister increases and the pressure sensor reading reaches a certain value, the wire mesh rinsing will automatically open. A conductivity sensor is installed below the demister. When the conductivity of the spray water in the gas scrubbing tower is detected to be greater than a certain value, the drain valve will automatically open, achieving unattended fully automatic operation.

[0055] Because the pressure of the first effect is higher than that of the second effect, the material can be transferred from the first effect to the second effect without a pump by utilizing the pressure difference between the effects. Similarly, the material can be transferred from the second effect to the third effect by utilizing the pressure difference between the effects. As the solution continues to evaporate in the first and second effects, the concentration gradually increases. The third-effect forced separator 14 is designed with an added salt leg. The principle of gravity sedimentation is used to continue to circulate and grow fine particles in the crystallizer, thereby improving the quality of valine. The third-effect evaporator discharges from the salt leg and is transferred to the fourth-effect crystallization system via the third-effect transfer pump B6. As evaporation proceeds, when the concentration in the system reaches 52%, the concentrated crystallized liquid is pumped out of the system by the discharge pump B9 and enters the subsequent centrifugal separation, drying, and packaging sections.

[0056] The condensate from the first effect is collected separately by the primary evaporation tank 2 due to its higher temperature. This high-temperature condensate is preheated by the primary condensate preheater 1 before being discharged from the system. The condensate from the second and third effects is collected centrally by the secondary evaporation tank 16, preheated by the secondary condensate preheater 17 before being discharged from the system. The condensate from the fourth effect is collected separately by the surface cooler evaporation tank 26 due to its lower temperature, and pumped out of the system by the surface cooler evaporation pump B10 for reuse. The negative pressure of the system is maintained by the surface cooler + vacuum pump B12, continuously expelling non-condensable gases from the system to establish a vacuum environment, preventing deterioration of heat transfer and pressure rise. The final effect temperature is maintained at 55℃, and the pressure is -0.085MPa.

[0057] The inlets of the single-effect forced circulation pump B3, the double-effect forced circulation pump B4, the triple-effect forced circulation pump B5, and the quadruple-effect forced circulation pump B8 are each equipped with emergency discharge ports, and all of them are discharged through the emergency discharge pump B11.

[0058] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A corn deep-processing valine extraction evaporation device, comprising a feed pump, characterized in that, The outlet of the feed pump is connected to the inlet of the first-effect forced separator via the cold side of the primary condensate preheater, secondary condensate preheater, triple-effect non-condensable gas preheater, second-effect non-condensable gas preheater and first-effect non-condensable gas preheater. The bottom circulation outlet of the first-effect forced separator is connected to the inlet of the first-effect forced circulation pump. The outlet of the first-effect forced circulation pump is connected to the tube-side inlet of the first-effect forced evaporator. The tube-side outlet of the first-effect forced evaporator is connected to the side wall circulation inlet of the first-effect forced separator through the outlet pipe of the first-effect evaporator. The outlet pipe of the first-effect evaporator is also connected to the middle of the second-effect liquid circulation pipe through the first-effect transfer pipe. The upper end of the second-effect liquid circulation pipe is connected to the bottom circulation liquid outlet of the second-effect forced separator. The lower end outlet of the second-effect liquid circulation pipe is connected to the tube-side inlet of the second-effect forced evaporator through the second-effect forced circulation pump. The tube-side outlet of the second-effect forced evaporator is connected to the side wall circulation liquid inlet of the second-effect forced separator through the outlet pipe of the second-effect evaporator. The outlet pipe of the second-effect evaporator is also connected to the middle of the third-effect evaporator liquid circulation pipe through the second-effect transfer pipe. The upper inlet of the third-effect evaporator liquid circulation pipe is connected to the circulation outlet of the third-effect forced separator. The lower outlet of the third-effect evaporator liquid circulation pipe is connected to the circulation inlet of the third-effect forced separator through the third-effect forced circulation pump and the tube side of the third-effect forced evaporator. The bottom salt leg outlet of the third-effect forced separator is connected to the inlet of the fourth-effect forced separator through the third-effect transfer pump and the third-effect transfer pipe. The circulating liquid outlet of the four-effect forced separator is connected to the circulating liquid inlet of the four-effect forced separator through the tube side of the four-effect forced circulation pump and the four-effect forced evaporator. The bottom salt leg outlet of the four-effect forced separator is connected to the discharge pipe through the discharge pump.

2. The corn deep processing valine extraction evaporation device according to claim 1, characterized in that: The shell-side exhaust port of the first-effect forced evaporator is connected to the hot-side inlet of the first-effect non-condensable gas preheater. The hot-side outlet of the first-effect non-condensable gas preheater is connected to the middle inlet of the first-effect non-condensable gas condensate tank. The bottom drain port of the first-effect non-condensable gas condensate tank is connected to the bottom shell-side inlet of the first-effect forced evaporator. The shell-side evaporation water outlet of the first-effect forced evaporator is connected to the inlet of the primary evaporation water tank. The outlet of the primary evaporation water tank is connected to the inlet of the primary evaporation water pump. The outlet of the primary evaporation water pump is connected to the hot-side inlet of the primary condensate preheater. The hot-side outlet of the primary condensate preheater is connected to the primary evaporation water output pipe.

3. The corn deep processing valine extraction evaporation device according to claim 2, characterized in that: The top secondary steam outlet of the first-effect forced separator is connected to the shell-side inlet of the second-effect forced evaporator via a first-effect demister. The top exhaust port of the first-effect non-condensable gas condensate tank is also connected to the shell-side inlet of the second-effect forced evaporator. The shell-side exhaust port of the second-effect forced evaporator is connected to the hot-side inlet of the second-effect non-condensable gas preheater. The hot-side outlet of the second-effect non-condensable gas preheater is connected to the middle inlet of the second-effect non-condensable gas condensate tank. The exhaust port of the second-effect non-condensable gas condensate tank is connected to the shell-side inlet of the third-effect forced evaporator. The bottom outlet of the second-effect non-condensable gas condensate tank is connected to the bottom shell-side inlet of the second-effect forced evaporator. The shell-side evaporated water outlet of the second-effect forced evaporator is connected to the bottom shell-side inlet of the third-effect forced evaporator.

4. The corn deep processing valine extraction evaporation device according to claim 1, characterized in that: The shell-side non-condensable gas outlet of the triple-effect forced evaporator is connected to the hot-side inlet of the triple-effect non-condensable gas preheater, the hot-side outlet of the triple-effect non-condensable gas preheater is connected to the middle inlet of the triple-effect non-condensable gas condensate tank, and the bottom outlet of the triple-effect non-condensable gas condensate tank is connected to the secondary distilled water tank; the shell-side distilled water outlet of the triple-effect forced evaporator is also connected to the secondary distilled water tank.

5. The corn deep processing valine extraction evaporation device according to claim 4, characterized in that: The top secondary steam outlet of the double-effect forced separator is connected to the shell-side inlet of the triple-effect forced evaporator via a double-effect demister; the top secondary steam outlet of the triple-effect forced separator is connected to the secondary distilled water tank via a triple-effect demister.

6. The corn deep processing valine extraction evaporation device according to claim 5, characterized in that: The bottom outlet of the secondary evaporation water tank is connected to the inlet of the secondary evaporation water pump, the outlet of the secondary evaporation water pump is connected to the hot side inlet of the secondary condensate preheater, and the hot side outlet of the secondary condensate preheater is connected to the inlet of the surface cooler evaporation water tank through the secondary evaporation water output pipe.

7. The corn deep processing valine extraction evaporation device according to claim 6, characterized in that: The shell-side evaporation outlet of the four-effect forced evaporator is connected to the inlet of the evaporation tank of the surface cooler; the shell-side non-condensable gas outlet of the four-effect forced evaporator and the top exhaust port of the four-effect forced separator are both connected to the inlet of the four-effect demister; the outlet of the four-effect demister is connected to the inlet of the combined air cooler; the outlet of the combined air cooler is connected to the hot-side inlet of the secondary surface cooler; the hot-side outlet of the secondary surface cooler is connected to the middle inlet of the condensate tank of the secondary surface cooler; the top exhaust port of the evaporation tank of the surface cooler is also connected to the middle inlet of the condensate tank of the secondary surface cooler; the top outlet of the condensate tank of the secondary surface cooler is connected to the inlet of the vacuum pump; the bottom drain of the condensate tank of the secondary surface cooler is connected to the inlet of the evaporation tank of the surface cooler through a water trap; the bottom outlet of the evaporation tank of the surface cooler is connected to the inlet of the evaporation pump of the surface cooler; and the outlet of the evaporation pump of the surface cooler is connected to the evaporation water output pipe of the surface cooler.

Images