Food-grade rice protein sterilizing and drying device

Abstract

The utility model discloses a food-grade rice protein sterilizing and drying device which is characterized in that refined protein pulp is connected with a main inlet of an ejector, an outlet of the ejector is connected with an inlet of a maintaining pipe, and an outlet of the maintaining pipe is connected with a side wall inlet of a flash tank; a bottom outlet of the flash tank is connected with an inlet of the dehydration horizontal screw centrifuge through the post-flash conveying pump, and a protein outlet of the dehydration horizontal screw centrifuge is connected with the protein drying unit through the wet protein conveyor. The wet protein discharging articulated chute is connected with an inlet of an air blower through an air seal machine, an outlet of the air blower is connected with a lower end inlet of a first-stage airflow dryer, an upper end outlet of the first-stage airflow dryer is connected with a first-stage cyclone separator, and a bottom outlet of the first-stage cyclone separator is connected with a feeding hole in the lower end of a second-stage airflow dryer through an air seal machine; an air outlet of the fresh air filter is connected with a hot air inlet in the lower end of the second-stage airflow dryer through the fin type heat exchanger. The device is good in sterilization effect, not prone to scaling, high in protein powder yield after drying and low in energy consumption.

Description

Technical Field

[0001] The utility model relates to a protein sterilizing and drying device, in particular to a food-grade rice protein sterilizing and drying device, and belongs to the technical field of broken rice protein processing equipment. Background Art

[0002] In the process of rice processing, about 20% rice husks, 15% broken rice and 10% rice bran are produced as by-products. These by-products are rich in protein, fat, starch, etc. Normally, we use broken rice and rice bran as feed and rice husk as fuel, which not only wastes resources but also has a certain impact on the environment.

[0003] Rice protein is recognized as the best cereal protein. It is rich in essential amino acids, easily digested and absorbed by the human body, and has low allergenicity, making it very suitable for the development of infant products. Broken rice is of poorer quality than rice, with more impurities, high ash content, and relatively cheap price. However, broken rice also has its advantages, with a higher protein content relative to rice. The protein content of broken rice can reach about 10.5%, while the protein content of rice is about 8.8%, which is about 2 percentage points higher than that of normal rice.

[0004] In the traditional process, broken rice is used as raw material, and glucose and protein are obtained through cleaning, milling, liquefaction, saccharification, and filtration. The protein high-temperature sterilization heat exchanger is prone to scaling and needs to be frequently disassembled and cleaned, affecting continuous production. However, the direct heating flash evaporation cooling method is prone to produce protein foam, resulting in excessive protein content in the flash steam, affecting the quality of the condensed water, and the COD content in the condensed water is high.

[0005] In addition, the particle size of protein is larger than that of rice starch, and it needs to be dried twice by airflow to reach the required moisture content. The moisture content of the protein is about 20% after the first drying, and then it is dried by the second airflow to about 5%. Because the moisture content of the protein in the secondary airflow is low and the exhaust gas temperature is high, this part of the exhaust gas is directly discharged into the air, causing energy waste. At the same time, due to the low moisture content and high protein powder, the exhaust gas of airflow drying is easy to lose powder, which not only puts great pressure on environmental protection, but also reduces the protein yield.

[0006] The Chinese invention patent with announcement number CN113481259B discloses a method for extracting starch syrup and rice protein isolate from broken rice. The method uses a spray sterilizer for sterilization at a temperature of 100°C. At this temperature, only bacteria that are not tolerant to temperature can be killed. Bacillus has a high tolerance temperature and requires a temperature above 125°C.

[0007] The Chinese invention patent application with publication number CN110938111A discloses a process for extracting rice protein from broken rice during rice processing. The method uses ultraviolet sterilization, which has limitations and is not thorough. It can only perform surface disinfection in certain specific places. It is quick and convenient, but the deep sterilization effect is not good. Utility Model Content

[0008] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0009] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0010] The utility model aims to overcome the problems existing in the prior art and provide a food-grade rice protein sterilization and drying device with good sterilization effect, low scaling, high protein powder yield after drying and low energy consumption.

[0011] To solve the above technical problems, the utility model provides a food-grade rice protein sterilization and drying device, comprising a refined protein slurry delivery pump, the outlet of the refined protein slurry delivery pump is connected to the main inlet of an ejector, the steam inlet of the ejector is connected to a steam pipeline through an ejection steam regulating valve and a steam filter, the outlet of the ejector is connected to the inlet of a maintaining pipe, the outlet of the maintaining pipe is connected to the side wall inlet of a flash tank, the bottom outlet of the flash tank is connected to the inlet of a dehydration horizontal screw centrifuge through a post-flash delivery pump, and the protein outlet of the dehydration horizontal screw centrifuge is connected to a protein drying unit through a wet protein conveyor.

[0012] Furthermore, a defoaming device is provided on the top of the flash tank, and the flash steam outlet on the top is connected to the middle inlet of the gas-liquid separator, the bottom outlet of the gas-liquid separator is connected to the bottom pipeline of the flash tank, and the secondary steam outlet of the gas-liquid separator is connected to the heat source inlet of the triple-effect evaporator of the syrup evaporation and concentration unit.

[0013] Furthermore, the protein drying unit includes a primary air flow dryer and a secondary air flow dryer, the air outlet of the primary fresh air filter is connected to the inlet of the blower via the cold side of the primary fin heat exchanger, and the discharge chute of the wet protein conveyor is also connected to the inlet of the blower via the wet protein feed air lock;

[0014] The outlet of the blower is connected to the lower inlet of the first-level air flow dryer, the upper outlet of the first-level air flow dryer is connected to the inlet of the first-level cyclone separator, the bottom outlet of the first-level cyclone separator is connected to the feed port at the lower end of the second-level air flow dryer through the first-level discharge air shutoff device; the air outlet of the second-level fresh air filter is connected to the hot air inlet at the lower end of the second-level air flow dryer through the cold side of the second-level fin heat exchanger.

[0015] Furthermore, the upper outlet of the secondary air flow dryer is connected to the inlet of the secondary cyclone separator, the bottom outlet of the secondary cyclone separator is connected to the inlet of the buffer bin through the secondary discharge air shutoff device, the bottom of the buffer bin is connected to the inlet of the ultrafine grinder through the discharge screw conveyor, the outlet of the ultrafine grinder is connected to the inlet of the pulse dust collector, the bottom outlet of the pulse dust collector is connected to the inlet of the inspection screen, and the outlet under the inspection screen is connected to the protein packaging workshop.

[0016] Furthermore, the outlet on the inspection screen is connected to the inlet of a return screw conveyor, and the outlet of the return screw conveyor is connected to the inlet of the superfine pulverizer through a reflux chute.

[0017] Furthermore, the tail gas outlet of the secondary cyclone separator is connected to the inlet of the induced draft fan, and the outlet of the induced draft fan is connected to the air outlet of the primary fin heat exchanger through a hot air return pipe.

[0018] Furthermore, a secondary exhaust gas temperature sensor is installed at the exhaust gas outlet of the secondary cyclone separator, and the hot side inlet of the secondary fin heat exchanger is connected to the steam pipe through a secondary heating steam regulating valve, and the opening of the secondary heating steam regulating valve is linked to the temperature measured by the secondary exhaust gas temperature sensor.

[0019] Furthermore, the exhaust gas outlet of the first-stage cyclone separator is installed with a first-stage exhaust gas temperature sensor, and the inlet of the dehydration horizontal screw centrifuge is installed with a dehydration feed flowmeter and a dehydration feed amount regulating valve, and the opening of the dehydration feed amount regulating valve is linked to the temperature measured by the first-stage exhaust gas temperature sensor.

[0020] Furthermore, the tail gas outlet of the pulse dust collector is communicated with the atmosphere through an exhaust fan.

[0021] Furthermore, an iron remover is provided in the outlet channel of the discharging screw conveyor.

[0022] Compared with the prior art, the utility model has achieved the following beneficial effects: 1. The sterilization is carried out by direct high-temperature jet heating. The protein slurry is directly mixed with clean steam and heated to the required temperature. The high-temperature sterilization is maintained for a certain period of time to avoid tube blockage and does not require frequent disassembly and cleaning. The sterilization temperature can reach above 135°C, which can kill temperature-resistant bacteria such as Bacillus.

[0023] 2. The sterilized protein enters the flash tank for flash cooling, and the cooled protein is removed from the horizontal screw for dehydration. In order to address the problem of foaming easily generated by flash evaporation of protein slurry, a defoaming device is added to the top of the flash tank. At the same time, the tail gas from the top of the flash tank is separated into gas and liquid again through a cyclone separator. The liquid brought out from the top is separated from the secondary steam by a cyclone separator. The secondary steam separated by two defoaming separations enters the evaporation system, reducing the consumption of steam generated by the evaporation system.

[0024] 3. The secondary airflow tail gas of protein drying is directly led to the air inlet of the primary airflow, mixed with the fresh air after two-stage filtration and heating, and enters the primary airflow drying together with the wet protein for drying. The tail gas of the primary airflow drying has no utilization value due to the high moisture content of the discharged material, low tail gas temperature, and low tail gas heat source quality, so it can be directly discharged. At the same time, the material has high moisture content, and the tail gas is not easy to lose powder, so it can be directly discharged into the air without treatment.

[0025] 4. The wet protein is dried by using a rotary valve to feed the airflow. This has obvious advantages over the traditional screw conveyor feeding: there are residues between the blades and cylinders of the screw conveyor, and there are many sanitary dead corners, which are not suitable for food-grade protein production. The rotary valve feeding can be used as an air shutoff device, and the unfiltered and heated air cannot enter the system through the rotary valve. At the same time, the rotary valve always has the opportunity to contact with the hot air during the rotation process, so it can be sterilized online without sanitary dead corners. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. The drawings are only provided for reference and explanation, not for limiting the present utility model. Among them:

[0027] Figure 1 This is a flow chart of the food-grade rice protein sterilization and drying device of the utility model;

[0028] In the figure: steam pipeline 700; refined protein slurry delivery pump 800;

[0029] Ejector 901; injection steam regulating valve PC901; injection temperature sensor TT901; injection steam pressure sensor PA901; maintenance tube 902; steam filter 903; flash tank 904; gas-liquid separator 905; post-flash delivery pump 906; dehydration horizontal screw centrifuge 907; dehydration feed amount regulating valve FC907; wet protein conveyor 908; wet protein feed air shutoff 909; blower 910; primary fresh air filter 911; primary fin heat exchanger 912; primary hot air temperature sensor TT912; primary heating steam regulating valve TC912; primary air flow drying Machine 913; first-stage cyclone separator 914; first-stage exhaust gas temperature sensor TT914; first-stage discharge air shutoff 915; second-stage air flow dryer 916; second-stage fresh air filter 917; second-stage fin heat exchanger 918; second-stage heating steam regulating valve TC918; second-stage cyclone separator 919; second-stage discharge air shutoff 920; induced draft fan 921; second-stage exhaust gas temperature sensor TT921; buffer bin 922; discharge screw conveyor 923; iron remover 924; ultrafine pulverizer 925; pulse dust collector 926; inspection screen 927; return screw conveyor 928; exhaust fan 929. DETAILED DESCRIPTION

[0030] In the following description of the utility model, the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not mean that the device must have a specific direction.

[0031] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific figures. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] like Figure 1As shown, the food-grade rice protein sterilizing and drying device of the utility model includes an ejector 901, a maintenance tube 902, a steam filter 903, a flash tank 904, a gas-liquid separator 905, a flash post-delivery pump 906, a dehydration horizontal screw centrifuge 907, a wet protein conveyor 908, a wet protein feed air shut-off device 909, a blower 910, a primary air flow dryer 913, a primary cyclone separator 914, a secondary air flow dryer 916, a secondary cyclone separator 919, an induced draft fan 921, a buffer bin 922, an ultrafine grinder 925, a pulse dust collector 926 and an inspection screen 927.

[0034] The outlet of the refined protein slurry delivery pump 800 is connected to the main inlet of the ejector 901, and the steam inlet of the ejector 901 is connected to the steam pipeline 700 through the jet steam regulating valve PC901 and the steam filter 903. The outlet of the ejector 901 is connected to the inlet of the maintenance pipe 902, and the outlet of the maintenance pipe 902 is connected to the side wall inlet of the flash tank 904, and the bottom outlet of the flash tank 904 is connected to the inlet of the dehydration horizontal screw centrifuge 907 through the flash back delivery pump 906, and the protein outlet of the dehydration horizontal screw centrifuge 907 is connected to the protein drying unit through the wet protein conveyor 908.

[0035] A defoaming device is provided on the top of the flash tank 904, and the flash steam outlet at the top is connected to the middle inlet of the gas-liquid separator 905, the bottom outlet of the gas-liquid separator 905 is connected to the bottom pipeline of the flash tank 904, and the secondary steam outlet of the gas-liquid separator 905 is connected to the heat source inlet of the triple-effect evaporator of the syrup evaporation and concentration unit.

[0036] The protein slurry after pH adjustment is mixed with steam and heated in the ejector 901. The outlet of the ejector 901 is provided with an ejection temperature sensor TT901. The temperature measured by the ejection temperature sensor TT901 is interlocked with the ejector needle valve TC901 to achieve automatic control. At the same time, an ejection steam regulating valve PC901 and an ejection steam pressure sensor PA901 are installed on the steam pipeline. By controlling the opening of the ejection steam regulating valve PC901, the steam pressure entering the ejector is controlled to maintain stable operation of the ejector 901 and achieve precise control.

[0037] The steam pipe is made of stainless steel to prevent the entry of iron ions, and is equipped with a steam filter 903 to remove impurities in the steam pipe and keep the steam clean.

[0038] The protein slurry after spraying enters the maintaining pipe 902 and is maintained for 10-20 seconds to allow the protein slurry to be quickly sterilized at high temperature. The sterilized protein slurry enters the flash tank 904 for flash cooling. Because bubbles are easily generated in the vacuum state of the protein slurry, a defoaming device is provided on the top of the flash tank 904, and a gas-liquid separator 905 is added to the secondary steam outlet to continue to remove the foam entrained from the secondary steam. The flashed secondary steam enters the triple-effect evaporator of the syrup evaporation and concentration unit as a heat source to realize the utilization of waste heat and reduce the raw steam consumption of the evaporation and concentration unit.

[0039] The protein slurry after flash cooling is sent to the dehydration horizontal screw centrifuge 907 for separation and dehydration through the post-flash delivery pump 906. The inlet of the dehydration horizontal screw centrifuge 907 is equipped with a flow meter and a dehydration feed amount regulating valve FC907. The clear liquid of the dehydration horizontal screw centrifuge 907 is directly discharged, and the heavy protein is transported to the drying section through the wet protein conveyor 908.

[0040] The air outlet of the first-level fresh air filter 911 is connected to the inlet of the blower 910 via the cold side of the first-level fin heat exchanger 912, and the discharge chute of the wet protein conveyor 908 is also connected to the inlet of the blower 910 via the wet protein feed air shut-off device 909. The outlet of the blower 910 is connected to the lower end inlet of the first-level air flow dryer 913.

[0041] The protein discharged from the wet protein conveyor 908 is fed into the inlet of the blower 910 through the wet protein feed air lock 909. The natural air is filtered by the primary fresh air filter 911 and then enters the primary fin heat exchanger 912 to be heated by steam to become hot air. The hot air is mixed with the protein and is sent by the blower 910 to the primary air flow dryer 913 for drying.

[0042] The wet protein feed air lock 909 is a rotary valve rotary feeder, which has obvious advantages over the traditional screw conveyor feeder: there are residues between the blades and barrels of the screw conveyor, and there are many sanitary dead corners, which are not suitable for food-grade protein production. The rotary valve feeder can close the air, and the unfiltered and heated air cannot enter the system through the rotary valve. At the same time, the rotary valve always has the opportunity to contact with the hot air during the rotation process, so it can be sterilized online without sanitary dead corners.

[0043] The hot side inlet of the first-stage fin heat exchanger 912 is connected to the steam pipe through the first-stage heating steam regulating valve TC912. A first-stage hot air temperature sensor TT912 is installed at the air outlet of the first-stage fin heat exchanger 912. The opening of the first-stage heating steam regulating valve TC912 is linked to the hot air temperature at the outlet of the first-stage fin heat exchanger 912.

[0044] As the egg white and the hot air flow along the primary airflow dryer 913, they are mixed and heat exchanged at the same time, and the moisture in the egg white is taken away by the hot air, thus achieving the purpose of drying.

[0045] The upper outlet of the primary airflow dryer 913 is connected to the inlet of the primary cyclone separator 914, and the bottom outlet of the primary cyclone separator 914 is connected to the feed port at the lower end of the secondary airflow dryer 916 through the primary discharge air lock 915. The tail gas of the primary airflow drying has no utilization value due to the high moisture content of the discharged material, low tail gas temperature, and low tail gas heat source quality, and can be directly discharged; at the same time, the material has high moisture content, and the tail gas is not easy to lose powder, so it can be directly discharged into the air without treatment.

[0046] After the first-stage drying, the gas enters the first-stage cyclone separator 914 for centrifugal separation. The tail gas outlet of the first-stage cyclone separator 914 is installed with a first-stage tail gas temperature sensor TT914. The opening of the dehydration feed amount regulating valve FC907 is interlocked with the first-stage tail gas temperature sensor TT914.

[0047] When the drying capacity is greater than the designed capacity and the tail gas temperature is lower than the set value, the opening of the dehydration feed regulating valve FC907 is automatically reduced, the feed amount of the horizontal screw is appropriately reduced, and the capacity is reduced;

[0048] When the drying capacity is less than the designed capacity and the tail gas temperature is higher than the set value, the opening of the dehydration feed regulating valve FC907 is automatically increased, the decanter feed amount is appropriately increased, and the capacity is increased.

[0049] The protein after primary airflow drying has not yet reached the moisture requirement of the finished product, and the protein discharged from the primary discharge air lock 915 enters the secondary airflow dryer 916 for further drying.

[0050] The air outlet of the secondary fresh air filter 917 is connected to the hot air inlet at the lower end of the secondary airflow dryer 916 via the cold side of the secondary fin heat exchanger 918. The upper end outlet of the secondary airflow dryer 916 is connected to the inlet of the secondary cyclone separator 919, and the bottom outlet of the secondary cyclone separator 919 is connected to the inlet of the buffer bin 922 via the secondary discharge air lock 920.

[0051] The bottom of the buffer bin 922 is connected to the inlet of the superfine pulverizer 925 through the discharge screw conveyor 923, the outlet of the superfine pulverizer 925 is connected to the inlet of the pulse dust collector 926, the bottom outlet of the pulse dust collector 926 is connected to the inlet of the inspection screen 927, and the under-screen outlet of the inspection screen 927 is connected to the protein packaging workshop. The upper screen outlet of the inspection screen 927 is connected to the inlet of the return screw conveyor 928, the outlet of the return screw conveyor 928 is connected to the inlet of the return screw conveyor 928, and the outlet of the return screw conveyor 928 is connected to the inlet of the superfine pulverizer 925 through the reflux chute.

[0052] The tail gas outlet of the secondary cyclone separator 919 is connected to the inlet of the induced draft fan 921, and the outlet of the induced draft fan 921 is connected to the air outlet of the primary fin heat exchanger 912 through a hot air return pipe. The secondary airflow tail gas has low protein moisture and high tail gas temperature, and this part of the tail gas is directly discharged into the air, causing energy waste. At the same time, due to low moisture content and high protein powder, the airflow drying tail gas is easy to run powder, which not only has great environmental pressure, but also reduces the protein yield. Therefore, the secondary airflow tail gas is directly led to the air inlet of the primary airflow, mixed with the fresh air after two-stage filtration and heating, and enters the primary airflow drying together with the wet protein for drying, and the protein powder and hot air waste heat are recovered.

[0053] Under the suction action of the induced draft fan 921, the fresh air is filtered by the secondary fresh air filter 917 and then enters the secondary fin heat exchanger 918 for heating. The hot side inlet of the secondary fin heat exchanger 918 is connected to the steam pipe through the secondary heating steam regulating valve TC918. The fresh air is heated by heat exchange with the steam in the secondary fin heat exchanger 918.

[0054] After secondary drying, the exhaust gas enters the secondary cyclone separator 919 for centrifugal separation. The exhaust gas outlet of the secondary cyclone separator 919 is installed with a secondary exhaust gas temperature sensor TT921. The hot side inlet of the secondary fin heat exchanger 918 is connected to the steam pipe through the secondary heating steam regulating valve TC918. The opening of the secondary heating steam regulating valve TC918 is linked to the temperature measured by the secondary exhaust gas temperature sensor TT921. The opening of the secondary heating steam regulating valve TC918 is adjusted according to the secondary exhaust gas temperature, thereby controlling the temperature of the hot air.

[0055] When the primary airflow is large, the tail gas temperature will decrease and the moisture content of the discharge will not meet the design requirements. By increasing the opening of the secondary heating steam regulating valve TC918 and increasing the evaporation intensity, the moisture content of the discharge can meet the design requirements.

[0056] Similarly, when the tail gas temperature is higher than the set value, the secondary heating steam regulating valve TC918 automatically reduces its opening, reduces the evaporation intensity of the secondary airflow, and achieves the discharge moisture content to meet the design requirements. By adjusting the opening of the secondary heating steam regulating valve TC918, the production capacity is not controlled, but the moisture content of the finished protein is controlled to meet the finished moisture requirements.

[0057] The bottom discharge of the secondary cyclone separator 919 enters the buffer bin 922 through the secondary discharge air lock 920. The buffer bin 922 is equipped with a weighing sensor. The bottom discharge screw conveyor 923 is frequency-controlled. The speed of the discharge screw conveyor 923 is interlocked with the weighing sensor to determine the amount of ultrafine grinding sent to the ultrafine grinding machine 925. An iron remover 924 is provided before entering the ultrafine grinding machine 925 to prevent iron impurities such as iron blocks and bolts in the production process from entering the ultrafine grinding machine and damaging the equipment.

[0058] The gluten powder crushed by the ultrafine pulverizer 925 is transported into the pulse dust collector 926 through the cold air conveying wind net. The gluten powder discharged from the pulse dust collector 926 is sieved by the finished product inspection sieve 927, and the exhaust gas is discharged to the outside through the exhaust fan 929.

[0059] The gluten powder that does not reach the grinding fineness of the sieve is transported back through the return screw conveyor 928 and then ground by the superfine grinder 925. The protein powder that falls through the sieve is transported to the protein packaging workshop and packaged into finished products for takeout.

[0060] The above description is only the preferred feasible embodiment of the utility model, which shows and describes the basic principle, main features and advantages of the utility model, but does not limit the scope of patent protection of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. In addition to the above embodiments, the utility model can also have other implementation modes without departing from the spirit and scope of the utility model. The utility model will also have various changes and improvements. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model. The scope of protection required by the utility model is defined by the attached claims and their equivalents. The technical features not described in the utility model can be achieved by or using existing technologies, which will not be repeated here.

Claims

1. A food-grade rice protein sterilization and drying device, comprising a refined protein slurry delivery pump (800), characterized in that: The outlet of the refined protein slurry delivery pump (800) is connected to the main inlet of the ejector (901), the steam inlet of the ejector (901) is connected to the steam pipeline (700) through the injection steam regulating valve (PC901) and the steam filter (903), the outlet of the ejector (901) is connected to the inlet of the maintenance pipe (902), the outlet of the maintenance pipe (902) is connected to the side wall inlet of the flash tank (904), the bottom outlet of the flash tank (904) is connected to the inlet of the dehydration horizontal screw centrifuge (907) through the post-flash delivery pump (906), and the protein outlet of the dehydration horizontal screw centrifuge (907) is connected to the protein drying unit through the wet protein conveyor (908).

2. The food-grade rice protein sterilizing and drying device according to claim 1, wherein: The top of the flash tank (904) is provided with a defoaming device, and the flash steam outlet at the top is connected to the middle inlet of the gas-liquid separator (905), the bottom outlet of the gas-liquid separator (905) is connected to the bottom pipeline of the flash tank (904), and the secondary steam outlet of the gas-liquid separator (905) is connected to the heat source inlet of the triple-effect evaporator of the syrup evaporation and concentration unit.

3. The food-grade rice protein sterilizing and drying device according to claim 1, characterized in that: The protein drying unit comprises a primary air flow dryer (913) and a secondary air flow dryer (916); the air outlet of the primary fresh air filter (911) is connected to the inlet of the blower (910) via the cold side of the primary fin heat exchanger (912); the discharge chute of the wet protein conveyor (908) is also connected to the inlet of the blower (910) via the wet protein feed air lock (909); The outlet of the blower (910) is connected to the lower inlet of the primary air flow dryer (913), the upper outlet of the primary air flow dryer (913) is connected to the inlet of the primary cyclone separator (914), and the bottom outlet of the primary cyclone separator (914) is connected to the feed port at the lower end of the secondary air flow dryer (916) via the primary discharge air shutoff device (915); the air outlet of the secondary fresh air filter (917) is connected to the hot air inlet at the lower end of the secondary air flow dryer (916) via the cold side of the secondary fin heat exchanger (918).

4. The food-grade rice protein sterilizing and drying device according to claim 3, characterized in that: The upper end outlet of the secondary air flow dryer (916) is connected to the inlet of the secondary cyclone separator (919), the bottom outlet of the secondary cyclone separator (919) is connected to the inlet of the buffer bin (922) through the secondary discharge air lock (920), the bottom of the buffer bin (922) is connected to the inlet of the ultrafine pulverizer (925) through the discharge screw conveyor (923), the outlet of the ultrafine pulverizer (925) is connected to the inlet of the pulse dust collector (926), the bottom outlet of the pulse dust collector (926) is connected to the inlet of the inspection screen (927), and the outlet below the screen of the inspection screen (927) is connected to the protein packaging workshop.

5. The food-grade rice protein sterilizing and drying device according to claim 4, characterized in that: The outlet on the inspection screen (927) is connected to the inlet of the return screw conveyor (928), and the outlet of the return screw conveyor (928) is connected to the inlet of the ultrafine pulverizer (925) through a reflux chute.

6. The food-grade rice protein sterilizing and drying device according to claim 4, characterized in that: The exhaust gas outlet of the secondary cyclone separator (919) is connected to the inlet of the induced draft fan (921), and the outlet of the induced draft fan (921) is connected to the air outlet of the primary fin heat exchanger (912) via a hot air return pipe.

7. The food-grade rice protein sterilizing and drying device according to claim 4, characterized in that: The exhaust gas outlet of the secondary cyclone separator (919) is installed with a secondary exhaust gas temperature sensor (TT921), and the hot side inlet of the secondary fin heat exchanger (918) is connected to the steam pipe through a secondary heating steam regulating valve (TC918), and the opening of the secondary heating steam regulating valve (TC918) is linked to the temperature measured by the secondary exhaust gas temperature sensor (TT921).

8. The food-grade rice protein sterilizing and drying device according to claim 3, characterized in that: The tail gas outlet of the first-stage cyclone separator (914) is installed with a first-stage tail gas temperature sensor (TT914), and the inlet of the dehydration horizontal screw centrifuge (907) is installed with a dehydration feed flow meter and a dehydration feed amount regulating valve (FC907), and the opening of the dehydration feed amount regulating valve (FC907) is linked to the temperature measured by the first-stage tail gas temperature sensor (TT914).

9. The food-grade rice protein sterilizing and drying device according to claim 4, characterized in that: The tail gas outlet of the pulse dust collector (926) is connected to the atmosphere through an exhaust fan (929).

10. The food-grade rice protein sterilization and drying device according to claim 4, characterized in that: An iron remover (924) is provided in the outlet passage of the discharge screw conveyor (923).

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