Bean protein dry production method and system

Abstract

The invention provides a dry-method production method and system for bean protein, which are used for solving the problem of low protein purity during dry-method production of the bean protein in the prior art. First-stage hot air is used for heating when the beans to be processed are crushed by the crushing device, and second-stage hot air is used for heating when the bean protein powder is screened by the airflow classifier, so that the bean protein powder with high purity and high yield is obtained; the'second-order temperature change 'environment also affects the crushing, release and distribution of different protein components in the sample, and meanwhile, the modification of heat treatment on different protein components and among the different protein components is also obtained, so that the secondary heat treatment modification of the protein is realized, and the characteristics of hardness, elasticity and the like of the protein used for the fibrous tissue protein are improved.

Description

Technical Field

[0001] The invention belongs to the field of food processing, and in particular relates to a dry production method and system of bean protein. Background Art

[0002] At present, there are two ways to produce bean protein powder, which are often called dry method and wet method. The main difference is whether water is used as a carrier of the material in the process. The dry method of producing bean protein powder will also produce starch. The traditional dry method is to peel the dry beans and crush them into powder of specific specifications, and then further separate them into protein-rich components (referred to as "protein-rich") and starch-rich components (referred to as "starch-rich") through a grading device. This method is simple, and no exogenous substances are added during the separation process. Compared with the wet method of extracting protein and starch from beans, the dry method does not consume additional water resources, and will not pollute the environment due to the problem of large-scale water resource discharge. It is not only energy-saving, low in production cost, high in production efficiency, and more environmentally friendly, but the protein purity (wet basis) of the protein powder obtained by the dry method is generally 50%-55%, and the current maximum does not exceed 60% (wet basis).

[0003] For example, CN101904407A discloses a method for extracting concentrated protein from bean starch production, which mainly includes the steps of grinding, grading, air conveying, sterilization, packaging and the like. The raw beans are crushed into coarse powder of about 120 mesh by a coarse grinder, and then further finely ground to 300-600 mesh by an ultrafine grinder. The powder is then separated into crude protein and crude starch by a classifier. The crude protein is conveyed to a sterilization site by an air conveyor to obtain concentrated protein powder with a protein content of 50%-60%, thereby realizing the mechanical dry separation of protein powder and starch in soybean powder.

[0004] Therefore, how to further improve the protein purity of bean protein during dry production is an urgent problem that technicians in this field need to solve. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a method and system for dry production of bean protein, so as to solve the problem of low protein purity in the dry production of bean protein in the prior art.

[0006] To achieve the above object and other related objects, the present invention provides a dry method for producing bean protein, comprising the following steps:

[0007] The first-stage hot air heated by the first-stage temperature controller is transported to the crushing device by the wind pressure of the first induced draft fan, and the beans to be processed are transferred to the crushing device by the material transmission device for crushing to form bean powder with a particle size of not less than 300 meshes;

[0008] The bean powder in the crushing device is transferred to the airflow classifier by the wind pressure of the first induced draft fan, and the second-stage hot air heated by the second-stage temperature controller is transported to the airflow classifier. The bean powder is screened by the airflow classifier and divided into starch-rich components and light components. The starch-rich components are discharged from the starch-rich discharge port at the bottom of the airflow classifier, and the light components are fed into the cyclone separator through the bean powder feed port of the airflow classifier by the first induced draft fan.

[0009] Most of the light components entering the cyclone collector are discharged from the first protein outlet at the bottom of the cyclone collector to obtain protein-rich I. The airflow carrying a small amount of ultrafine powder enters the compartment pulse dust collector from the second outlet at the top of the cyclone collector for secondary collection. The second protein is discharged from the bottom of the compartment pulse dust collector to obtain protein-rich II, and the airflow is discharged from the outlet of the first induced draft fan.

[0010] Protein-rich I and protein-rich II enter the first bag-type conveying dust collector through a pipeline under the action of the airflow conveying force generated by the second induced draft fan, and are combined to obtain bean protein powder; the temperatures of the first-stage hot air and the second-stage hot air are different.

[0011] Optionally, the temperature of the first-stage hot air is greater than the temperature of the second-stage hot air; and / or, the temperature range of the first-stage hot air is 100°C to 150°C; and / or, the temperature range of the second-stage hot air is 180°C to 220°C; and / or, the frequency range of the built-in classifier is 35Hz to 45Hz; and / or, the frequency range of the airflow classifier is 42Hz to 48Hz; and / or, the wind pressure of the first induced draft fan transfers the bean powder in the crushing device to the airflow classifier and the second-stage hot air heated by the second-stage temperature controller is transported to the airflow classifier, and the bean powder is screened by the airflow classifier and divided into starch-rich components and light components, the starch-rich components are discharged from the low-end discharge port of the airflow classifier, and the light components enter the cyclone separator through the top discharge port of the airflow classifier using the first induced draft fan, including: the starch-rich component enters the second bag-type conveying dust collector for collection through the action of the third induced draft fan.

[0012] Optionally, the temperature range of the first-stage hot air is 120°C to 140°C; and / or, the temperature range of the second-stage hot air is 180°C to 200°C; and / or, the frequency range of the built-in classifier is 39Hz to 42Hz.

[0013] The present invention also provides a bean protein dry production system, comprising a material conveying device, a crushing device, an airflow classifier, a heating device, a cyclone collector, a chamber pulse dust collector, a first bag-type conveying dust collector, a second bag-type conveying dust collector, a first induced draft fan, a second induced draft fan, and a third induced draft fan; the material conveying device is used to convey the beans to be processed to the crushing device; the crushing device is used to crush the beans to be processed to form bean powder with a particle size of not less than 300 meshes; the airflow classifier is used to screen the bean powder into starch-rich and light components; the cyclone collector is used to collect the light components to form an airflow rich in protein I and a small amount of ultrafine powder; the chamber pulse dust collector is used to collect protein-rich II in the airflow carrying a small amount of ultrafine powder; the first bag-type conveying dust collector is used to separate protein-rich I from protein-rich I I is combined to form bean protein powder; the second bag-type conveying dust collector is used to collect starch-rich; the heating device is used to heat the air to form first-order hot air and second-order hot air with different temperatures; the first induced draft fan is used to convey the first-order hot air to the crushing device, to transfer the bean powder in the crushing device to the air flow classifier, to transfer the light components in the air flow classifier to the cyclone collector, to transfer the air flow carrying a small amount of ultrafine powder in the cyclone collector to the chamber pulse dust collector, and also to transfer the second-order hot air to the air flow classifier; the second induced draft fan is used to transfer the protein-rich I in the cyclone collector and the protein-rich II in the chamber pulse dust collector to the first bag-type conveying dust collector; the third induced draft fan is used to transfer the starch-rich in the air flow classifier to the second bag-type conveying dust collector.

[0014] Optionally, the crushing device includes a crushing mechanism, a built-in classifier, and a shell; a crushing chamber is provided in the shell, and the crushing mechanism and the built-in classifier are arranged in the crushing chamber, the crushing mechanism is used to crush the beans to be processed in the crushing chamber, and the built-in classifier is used to grade and screen the bean powder; a feed port for beans to be processed and a first air inlet connected to the crushing chamber are provided on the side of the shell; a bean powder discharge port for being connected to the first induced draft fan is provided on the top of the shell; the feed port for beans to be processed is connected to the material conveying device; the first air inlet is connected to the heating device; the first induced draft fan conveys the first-stage hot air into the crushing chamber through the first air inlet.

[0015] Optionally, there are multiple first air inlets, which are spaced apart along the circumferential direction and axial direction of the shell; and the center line of the first air inlet is arranged at an acute angle to the bottom of the shell.

[0016] Optionally, the heating device includes an air heating mechanism, a first pipe, a second pipe, a third pipe, a fourth pipe and a temperature regulating mechanism; one end of the first pipe is connected to the air heating mechanism, and the other end is connected to the second pipe; the end of the second pipe away from the first pipe is connected to the air flow classifier; one end of the third pipe is connected to the first pipe, and the other end is connected to the temperature regulating mechanism; one end of the fourth pipe is connected to the temperature regulating mechanism, and the other end is connected to the crushing device; the air heating mechanism is used to heat the air to form second-order hot air, and the temperature regulating mechanism is used to adjust the temperature of the second-order hot air in the third pipe to the temperature of the first-order hot air.

[0017] Optionally, the temperature regulating mechanism includes an air inlet valve, a fifth pipe, and a pipe joint; one end of the pipe joint is connected to the third pipe, and the other end is connected to the fourth pipe; the air inlet valve is connected to the pipe joint through the fifth pipe; the air inlet valve is used to transfer air with a temperature lower than the first-stage hot air temperature to the fourth pipe through the fifth pipe and the pipe joint to adjust the temperature of the second-stage hot air.

[0018] Optionally, the pipe joint includes an air intake chamber, an air intake channel and a gas mixing chamber; the air intake chamber is connected to the gas mixing chamber through the air intake channel; the air intake valve is connected to the air intake chamber through a fifth pipe; the air intake chamber is a circular ring structure, and the air intake channel is a trumpet-shaped structure; the small end of the air intake channel is arranged toward the gas mixing chamber; a first guide, a second guide and a third guide for guiding the flow of gas are arranged on a side wall of the air intake chamber close to the center line of the air intake channel; the first guide and the second guide are arranged at intervals from a side wall of the air intake chamber away from the center line of the air intake channel; on a cross section perpendicular to the center line of the air intake channel, the first guide is away from the air intake chamber. The distance between a point on the side of the center line of the air channel and the center line of the air intake channel is smaller than the distance between a point on the side of the second guide member away from the center line of the air intake channel and the center line of the air intake channel; one end of the third guide member away from the center line of the air intake channel is connected to the side wall of the air intake chamber away from the center line of the air intake channel; a gas guide member and a cross-shaped mounting member are arranged in the gas mixing chamber; the gas guide member is arranged at the intersection formed by the four arms of the cross-shaped mounting member, and the gas guide member is connected to the inner side wall of the gas mixing chamber through the cross-shaped mounting member; the gas guide member is used to guide the second-stage hot air to flow in a direction deviating from the center line of the third pipeline.

[0019] Optionally, a gas mixing piece is also provided in the gas mixing chamber; the gas mixing piece is rotatably connected to the cross-shaped mounting piece; the gas guide piece is connected to one end of the gas mixing piece away from the cross-shaped mounting piece; and / or, a guide portion for guiding the flow of gas is provided on the inner side wall of the connecting end of the fourth pipe and the pipe joint; and / or, there are two fifth pipes, the air intake chamber is divided into two fan-shaped sub-air intake chambers, and the fifth pipes and the sub-air intake chambers are provided in a one-to-one correspondence; each sub-air intake chamber is provided with a first guide piece, a second guide piece and a third guide piece for guiding the flow of air.

[0020] As described above, the dry-process production method and system of bean protein of the present invention have at least the following beneficial effects:

[0021] 1. Conventional protein separation processes generally try to reduce the material temperature during the crushing and separation process, and in order to avoid protein denaturation and reduced performance under high temperature conditions, measures such as setting a cooling water layer in the crushing chamber or configuring a cooling fan are often used to reduce the impact. However, this patent breaks through the process prejudice that protein separation cannot be performed under high temperature conditions. Through "second-order temperature change", the beans to be processed are heated during the dry production of beans, that is, the first-order hot air is used to heat the beans to be processed when the crushing device is used to crush them, and the second-order hot air is used to heat the beans when the airflow classifier is used to screen the bean protein powder, so as to obtain high-purity and high-yield bean protein powder.

[0022] 2. The "second-order temperature change" environment affects the crushing, release and distribution of different protein components in the sample, and also obtains the modification of different protein components and their interactions by heat treatment; it also realizes the secondary heat treatment modification of protein, and improves the hardness and elasticity of protein used in fibrous tissue protein. This is different from the conventional treatment effect of heating protein alone, which greatly increases the regulation strategy of protein characteristics in production and further expands its application function and scope. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a schematic flow chart of a dry-process production method of bean protein according to the present invention.

[0024] Figure 2 Shown is a schematic structural diagram of an implementation of a dry-process production system for bean protein of the present invention.

[0025] Figure 3 Shown is a schematic structural diagram of another implementation of a dry-process production system for bean protein of the present invention.

[0026] Figure 4 Shown is a schematic structural diagram of a crushing device of a bean protein dry production system of the present invention.

[0027] Figure 5Shown is a schematic structural diagram of a temperature regulating mechanism of a bean protein dry production system of the present invention.

[0028] Figure 6 The diagram shows an angled cross-sectional view of a pipe joint of a bean protein dry production system according to the present invention.

[0029] Figure 7 The diagram shows a cross-sectional view from another angle of a pipe joint of a bean protein dry production system of the present invention.

[0030] Figure 8 The figure shows a cross-sectional schematic diagram from another angle of a pipeline joint of a bean protein dry production system of the present invention.

[0031] Fig. 9 It shows a schematic structural diagram of a gas guide member, a cross-shaped mounting member, and a gas mixing member of a bean protein dry production system of the present invention. DETAILED DESCRIPTION

[0032] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] Please refer to all the following drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0034] In addition, in the present invention, the "particle size D

[90] " refers to the particle size corresponding to when the cumulative particle size distribution percentage of a sample reaches 90%. Its physical meaning is that particles with a particle size smaller than it account for 90%, and particles with a particle size larger than it account for 10%. The "protein-rich" refers to a protein content (dry basis) of more than 50%. The "starch-rich" refers to a starch content (dry basis) of more than 50%.

[0035] In the present invention, the separation degree (R) is a measure of the separation degree of protein-rich and starch-rich obtained based on the production system, and the calculation formula is as follows:

[0036]

[0037] Among them, Δt R =|t R2 -t R1 |,t R1 and t R2 w1 and w2 are the peak particle sizes of the volume particle size (μm) distribution of the protein-rich and starch-rich components, respectively; w1 and w2 are the peak widths of the volume particle size (μm) distribution of the protein-rich and starch-rich components, respectively.

[0038] In the present invention, in order to verify the function of bean protein, it was mixed with the same mass of active gluten powder, and then extruded with an AHT50 twin-screw extruder (Zhennuo Equipment Co., Ltd.) to prepare high-moisture fibrous tissue protein (hereinafter referred to as fibrin), the maximum temperature of the heating section was 140°C, the cooling temperature was 20°C, and the water content of the fibrin was 60% (w / w). The texture hardness and chewiness test methods are as follows:

[0039] The texture of fibrin (including hardness and chewiness) was analyzed using a TA.XT2 texture analyzer (Stable Micro System TA.XT plus). The sample was cut into a piece of 10×10×2 mm (length, width and height) and then analyzed using a P / 35 probe at 1 mms -1 The sample was compressed to 50% of its original thickness at a speed of 100° for 5 seconds, and the hardness and elasticity data were recorded. The hardness is the maximum peak value during the first compression, and the elasticity is the ratio of the sample's recovered height during the second compression to the first compression deformation.

[0040] Protein solubility: The protein sample was prepared into a 5% (w / v) solution in a phosphate buffer solution (pH 7), and shaken in a constant temperature water bath (25°C, 1h), and then centrifuged for 30min (3836g). The protein content in the supernatant was determined by the Kjeldahl method (nitrogen conversion coefficient 6.25). The solubility is equal to the percentage of the supernatant protein content to the total protein content.

[0041] Emulsifying activity: dilute the above protein solution 5 times and mix it with soybean oil, emulsify it for 2 minutes at 13500rpm in a high-speed emulsifying homogenizer. Immediately mix 20μL of the emulsion with 5mL of 0.1% SDS solution, and measure the absorbance of the diluted emulsion at a wavelength of 500nm, which is recorded as A0. Use 0.1% SDS as a blank control. Calculate the emulsifying property using the following formula:

[0042]

[0043] Wherein, T=2.303, N: 250, c: protein concentration in the protein solution before emulsion formation (g / mL), φ: volume fraction of oil in the emulsion (0.25).

[0044] The energy efficiency of the heating device is calculated according to the following formula:

[0045]

[0046] Among them, c i is the specific heat capacity of the heated material or medium, m i is the mass or mass flow of the heated material or medium, △T is the temperature difference, and E is the power consumption value.

[0047] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0048] The present invention provides a dry method for producing bean protein, such as Figure 1 As shown, the following steps are included:

[0049] S100: The first-stage hot air heated by the first-stage temperature controller is transported to the crushing device 2 by the wind pressure of the first induced draft fan 9, and the beans to be processed are transferred to the crushing device 2 by the material transmission device for crushing to form bean powder with a particle size of not less than 300 meshes.

[0050] The beans to be processed may be peas, mung beans and the like, which are not limited in this embodiment.

[0051] Before performing step S100, the following steps may also be included:

[0052] S101: the beans to be processed are initially cleaned by a primary cleaning screen combined with an air screen to remove impurities in the beans to be processed;

[0053] Specifically, a primary cleaning screen that combines wind and screen is used. Wind and screen combination means using wind to blow away lighter impurities (such as dust and debris), while using a screen to screen out larger impurities (such as stones, branches, etc.). After this step of processing, most of the impurities in the beans are removed, laying a good foundation for the subsequent steps.

[0054] S102: using a stone remover to remove impurities such as stones that are difficult to remove from the beans to be processed.

[0055] Remove impurities such as side stones in beans that are difficult to be cleaned by the primary sieve. Side stones refer to stones that are similar in size and weight to beans, which may be difficult to separate by the primary sieve. After this step of processing, impurities such as side stones in beans are effectively removed, improving the purity of beans.

[0056] S103: using a grading machine to grade the beans to be processed according to size;

[0057] After this step, the beans are sorted into different grades for subsequent processing and quality control.

[0058] S104: The beans to be processed after being sorted are peeled using a bean peeling machine.

[0059] Removal of the skin or husk from beans to allow for further processing or to improve the taste and quality of starch- or protein-rich beans.

[0060] S200: The bean powder in the crushing device 2 is transferred to the air flow classifier 3 under the action of the wind pressure of the first induced draft fan 9, and the second-stage hot air heated by the second-stage temperature controller is transported to the air flow classifier 3. The bean powder is screened by the air flow classifier 3 and divided into starch-rich components and light components. The starch-rich components are discharged from the starch-rich discharge port at the bottom of the air flow classifier 3, and the light components enter the cyclone separator through the bean powder feed port at the top of the air flow classifier 3 using the first induced draft fan 9.

[0061] Step S200 also includes the starch-rich component entering the second bag-type conveying dust collector 8 for collection through the action of the third induced draft fan 11.

[0062] S300: Most of the light components entering the cyclone collector 5 are discharged from the first protein outlet at the bottom of the cyclone collector 5 to obtain protein-rich I. The airflow carrying a small amount of ultrafine powder enters the chamber pulse dust collector 6 from the second outlet at the top of the cyclone collector 5 for secondary collection, and is discharged from the second protein outlet at the bottom of the chamber pulse dust collector 6 to obtain protein-rich II. The airflow is discharged from the outlet of the first induced draft fan 9.

[0063] S400: The protein-rich I and the protein-rich II enter the first bag-type conveying dust collector 7 through a pipeline under the action of the airflow conveying force generated by the second induced draft fan 10, and are combined to obtain bean protein powder.

[0064] The temperatures of the first-stage hot air and the second-stage hot air are different. Specifically, the temperature of the first-stage hot air is greater than the temperature of the second-stage hot air.

[0065] like Figure 2 , 3As shown, the present invention also provides a bean protein dry production system, including a material conveying device 1, a crushing device 2, an airflow classifier 3, a heating device 4, a cyclone collector 5, a chamber pulse dust collector 6, a first bag-type conveying dust collector 7, a second bag-type conveying dust collector 8, a first induced draft fan 9, a second induced draft fan 10 and a third induced draft fan 11; the material conveying device 1 is used to convey the beans to be processed into the crushing device 2; the crushing device 2 is used to crush the beans to be processed to form bean powder with a particle size of not less than 300 meshes; the airflow classifier 3 is used to screen the bean powder into starch-rich and light components; the cyclone collector 5 is used to collect the light components to form an airflow rich in protein I and a small amount of ultrafine powder; the chamber pulse dust collector 6 is used to collect protein-rich II in the airflow entrained with a small amount of ultrafine powder; the first bag-type conveying dust collector 7 is used to separate protein-rich I from protein-rich II is combined to form bean protein powder; the second bag-type conveying dust collector 8 is used to collect starch-rich; the heating device 4 is used to heat the air to form first-order hot air and second-order hot air with different temperatures; the first induced draft fan 9 is used to convey the first-order hot air to the crushing device 2, to transfer the bean powder in the crushing device 2 to the air flow classifier 3, to transfer the light components in the air flow classifier 3 to the cyclone collector 5, to transfer the air flow carrying a small amount of ultrafine powder in the cyclone collector 5 to the chamber pulse dust collector 6, and also to transfer the second-order hot air to the air flow classifier 3; the second induced draft fan 10 is used to transfer the protein-rich I in the cyclone collector 5 and the protein-rich II in the chamber pulse dust collector 6 to the first bag-type conveying dust collector 7; the third induced draft fan 11 is used to transfer the starch-rich in the air flow classifier 3 to the second bag-type conveying dust collector 8.

[0066] Specifically, the feeding device may include a raw material bin 12 for storing beans to be processed and a feeding mechanism 13 for conveying the beans to be processed to the crushing device 2; a feeding port is provided at the top of the raw material bin 12, and a raw material outlet is provided at the bottom thereof; one end of the feeding mechanism 13 is connected to the raw material outlet, and one end of the discharging mechanism is connected to the crushing device 2. The feeding mechanism 13 may be a feeding mechanism 13 with a belt or a movable feeding belt, and the present invention is not limited thereto, as long as it can realize conveying the beans to be processed in the raw material bin 12 to the crushing device 2.

[0067] like Figure 4As shown, the crushing device 2 can be a graded impact mill. In this embodiment, the crushing device 2 includes a crushing mechanism 21, a built-in classifier 22, and a shell 23; a crushing chamber 231 is arranged in the shell 23, and the crushing mechanism 21 and the built-in classifier 22 are arranged in the crushing chamber 231. The crushing mechanism 21 is used to crush the beans to be processed in the crushing chamber 231, and the built-in classifier 22 is used to grade and screen the bean powder; a bean feed port 232 to be processed and connected to the crushing chamber 231 and a first air inlet 233 are arranged on the side of the shell 23; a bean powder discharge port 234 for connecting to the first induced draft fan 9 is arranged on the top of the shell 23; the bean feed port 232 to be processed is connected to the material conveying device 1, and specifically can be connected to the discharge end of the feeding mechanism 13 of the material conveying device 1; the first air inlet 233 is connected to the heating device 4; the first induced draft fan 9 conveys the first-stage hot air to the crushing chamber 231 through the first air inlet 233. The built-in classifier 22 can be arranged above the crushing mechanism 21, and the first induced draft fan 9 can be arranged corresponding to the bean powder discharge port 234. When in use, the crushing mechanism 21 located at the bottom of the crushing chamber 231 crushes the beans to be processed, and at the same time, the first induced draft fan 9 uses the first air inlet 233 to transmit the first-stage hot air to the crushing chamber 231 to heat the beans to be processed, and the first induced draft fan 9 also uses wind pressure to transmit the crushed bean powder to the built-in classifier 22 for classification. When the particle size of the bean powder is not less than 300 meshes, the first induced draft fan 9 uses the bean powder discharge port 234 to transmit the bean powder to the airflow classifier 3. In this embodiment, the built-in classifier 22 is a classification turbine. Of course, in other embodiments, it can also be other classifiers, and the embodiments are not limited to this. In other embodiments, the built-in classifier 22 and the crushing mechanism 21 can be arranged side by side in the crushing chamber, that is, the crushing device is a horizontal crushing device.

[0068] In one embodiment, there are multiple first air inlets 233, which are arranged at intervals along the circumference and axial direction of the shell 23; the center line of the first air inlet 233 and the bottom of the shell 23 are arranged at an acute angle. Specifically, the opening direction of the first air inlet 233 can be arranged toward the bottom of the shell 23. At this time, when the first induced draft fan 9 transmits the first-stage hot air to the crushing chamber 231, the first-stage hot air can evenly heat the beans to be processed in the crushing chamber 231, thereby improving production efficiency. In addition, the opening direction of the first air inlet can be arranged toward the grading mechanism. In this arrangement, since there are multiple first air inlets 233 and the bean feed port 232 to be processed is arranged on the side of the shell 23, while the first-stage hot air can heat the beans, since the first air inlet is arranged toward the grading mechanism, it is convenient for the first induced draft fan 9 to guide the first-stage hot air into the crushing chamber 231, thereby improving the working efficiency of the first induced draft fan 9.

[0069] See also Figure 2 , 3The airflow classifier 3 is provided with a first discharge port, a bean powder feed port and a starch-rich discharge port from top to bottom, and the bean powder feed port is connected to the bean powder discharge port 234 of the crushing device 2 through a discharge channel. The starch-rich discharge port of the airflow classifier 3 is connected to the second bag-type conveying dust collector 8 through a discharge channel.

[0070] A cyclone collector 5 is provided with a second discharge port, a first feed port and a first protein discharge port in sequence from top to bottom, and the first feed port is connected to the first discharge port through a feed channel;

[0071] The chamber pulse dust collector 6 has a second feed inlet and a first air outlet at the top, and a second protein outlet at the bottom. Figure 1 Or 2 shows that there are 3 second protein outlets, which is related to the number of outlets set at the bottom of the chamber pulse dust collector 6), the second feed port is connected to the second outlet through a feed pipe, and the first air outlet is connected to the first induced draft fan 9 through an air outlet channel;

[0072] The first bag-type conveying dust collector 7 is provided with a second air outlet, a third feed port and a third protein discharge port in sequence from top to bottom. The third feed port is connected to the first protein discharge port and the second protein discharge port through a feed channel. The second air outlet is connected to the second induced draft fan 10, and the third protein discharge port is connected to the protein storage bin.

[0073] The second bag-type conveying dust collector 8 is provided with a third air outlet, a fourth feed port and a starch-rich outlet from top to bottom. The fourth feed port is connected to the starch-rich outlet through a feed channel, and the third air outlet is connected to the third induced draft fan 11.

[0074] like Figure 3 As shown, there may be two heating devices 4, one of which is connected to the crushing device 2 for generating first-order hot air, and the other is connected to the airflow classifier 3 for generating second-order hot air. When there are two heating devices 4, the air heating mechanism 41 of the heating device 4 for heating the second-order hot air may be an electromagnetic hot air furnace, and the air heating mechanism 41 of the heating device 4 for heating the first-order hot air may be a pipeline electromagnetic heater. A temperature regulating mechanism 46 may be provided on the heating device 4 or on the connecting pipeline between the heating device 4 and the crushing device 2 to adjust the temperature of the first-order hot air output by the heating device 4. Of course, a temperature regulating mechanism 46 may also be provided on the heating device 4 or on the connecting pipeline between the heating device 4 and the airflow classifier 3 to adjust the temperature of the second-order hot air output by the heating device 4. The temperature regulating mechanism 46 may be a temperature regulating valve or a refrigeration device.

[0075] like Figure 2As shown, in one embodiment, there is one heating device 4, which includes an air heating mechanism 41, a first pipe 42, a second pipe 43, a third pipe 44, a fourth pipe 45 and a temperature regulating mechanism 46; one end of the first pipe 42 is connected to the air heating mechanism 41, and the other end is connected to the second pipe 43; the end of the second pipe 43 away from the first pipe 42 is connected to the air flow classifier 3; one end of the third pipe 44 is connected to the first pipe 42, and the other end is connected to the temperature regulating mechanism 46; one end of the fourth pipe 45 is connected to the temperature regulating mechanism 46, and the other end is connected to the crushing device 2; the air heating mechanism 41 is used to heat the air to form second-order hot air, and the temperature regulating mechanism 46 is used to adjust the temperature of the second-order hot air in the third pipe 44 to the temperature of the first-order hot air. Specifically, the connecting ends of the first pipe 42 and the second pipe 43 can be connected through a two-way joint; a three-way joint can be provided at the connection between the first pipe 42 and the third pipe 44, and the first pipe 42 can be divided into a first sub-pipeline and a second sub-pipeline, one end of the first sub-pipeline is connected to the air heating mechanism 41, and the other end is connected to the three-way joint; one end of the second sub-pipeline is connected to the three-way joint, and the other end is connected to the second pipe 43 through a two-way joint; one end of the third pipe 44 is connected to the three-way joint, and the other end is connected to the temperature adjustment mechanism 46. In one implementation, a temperature detection component for detecting the temperature of the second-order hot air is also provided on the third pipe 44. When the temperature of the second-order hot air is higher than a preset value, the temperature of the second-order hot air outputted by the heating device 4 is adjusted by feedback to ensure that the second-order hot air can be maintained at the preset value. In this embodiment, the air heating mechanism 41 is an electromagnetic hot air furnace, and of course it can also be other heating mechanisms, which is not limited in this embodiment. In this embodiment, a temperature regulating mechanism 46 may also be provided on the second pipe 43 to regulate the temperature of the second-stage hot air delivered to the second pipe 43, so as to avoid the second-stage hot air from changing due to the cooling of the air heated by the air heating mechanism 41 during the process of being transmitted from the first pipe 42 to the second pipe 43. The temperature regulating mechanism 46 provided on the third pipe 44 and the temperature regulating mechanism 46 on the second pipe 43 may be the same or different, which is not limited in this embodiment. In this embodiment, the two temperature regulating mechanisms 46 are the same.

[0076] The temperature regulating mechanism 46 may be a device provided with a refrigeration module, so that when the second-stage hot air in the third pipe 44 flows into the temperature regulating mechanism 46, the refrigeration module is used to align and cool the second-stage hot air, thereby reducing the temperature of the second-stage hot air to the first-stage hot air.

[0077] like Figure 2 , 5As shown, the temperature regulating mechanism 46 includes an air inlet valve 461, a fifth pipe 462, and a pipe joint 463; the pipe joint 463 is sleeved on the third pipe 44, one end of which is connected to the third pipe 44, and the other end is connected to the fourth pipe 45; the air inlet valve 461 is connected to the pipe joint 463 through the fifth pipe 462; the air inlet valve 461 is used to transmit air with a temperature lower than the temperature of the first-order hot air (hereinafter referred to as cold air) to the fourth pipe 45 through the fifth pipe 462 and the pipe joint 463 to adjust the temperature of the second-order hot air. Specifically, the pipe joint 463 can be a three-way joint, and the third pipe 44, the fourth pipe 45, and the fifth pipe 462 are respectively connected to one end of the three-way joint. The air inlet valve 461 can be a linkage temperature control regulating air valve, which can monitor the temperature of the first section of hot air in the fourth pipe 45 in real time, and then automatically adjust the air inlet flow rate, so as to achieve accurate control of the temperature of the first-order hot air. The air whose temperature is lower than the first-stage hot air temperature can be room temperature air, and of course it can also be air heated by a heating device. This embodiment does not impose any restrictions on this, as long as the temperature of the air entering through the air inlet valve 461 is lower than the first-stage hot air temperature.

[0078] like Figure 6 , 7As shown, the pipe joint 463 includes an air inlet chamber 4631, an air inlet channel 4632 and a gas mixing chamber 4633; the air inlet chamber 4631 is connected to the gas mixing chamber 4633 through the air inlet channel 4632; the air inlet valve 461 is connected to the air inlet chamber 4631 through the fifth pipe 462; the air inlet chamber 4631 is a circular ring structure, and the air inlet channel 4632 is a trumpet structure; a first guide 46311, a second guide 46312 and a third guide 46313 for guiding air flow are arranged on a side wall of the air inlet chamber 4631 close to the center line of the air inlet channel 4632; the first guide 46311 and the second guide 46312 are arranged at intervals from a side wall of the air inlet chamber 4631 away from the center line of the air inlet channel 4632; on a cross section perpendicular to the center line of the air inlet channel 4632, the first guide 46311 The distance between the side away from the center line of the air inlet channel 4632 and the center line of the air inlet channel 4632 is smaller than the distance between the side of the second guide member 46312 away from the center line of the air inlet channel 4632 and the center line of the air inlet channel 4632; the side of the third guide member 46313 away from the center line of the air inlet channel 4632 is connected to the side wall of the air inlet cavity 4631 away from the center line of the air inlet channel 4632; a gas guide member 4633 and a cross-shaped mounting member 4634 are provided in the gas mixing chamber 4633; the gas guide member 4633 is provided at the intersection formed by the four arms of the cross-shaped mounting member 4634, and the gas guide member 4633 is connected to the inner side wall of the gas mixing chamber 4633 through the cross-shaped mounting member 4634; the gas guide member 4633 is used to guide the second-stage hot air to flow in a direction deviating from the center line of the third pipe 44.

[0079] Specifically, the pipe joint 463 includes a first connection end connected to the third pipe 44 and a second connection end connected to the fourth pipe 45. The gas mixing chamber 4633 is arranged between the first connection end connected to the third pipe 44 and the second connection end connected to the fourth pipe 45. The air intake channel 4632 and the air intake chamber 4631 are arranged on the outside of the first connection end connected to the third pipe 44. The air intake channel 4632 is a trumpet-shaped joint, with its small end arranged toward the gas mixing chamber 4633 and its large end arranged toward the third pipe 44. The first guide 46311, the second guide 46312 and the third guide 46313 are arranged on the inner side wall of the air intake chamber 4631 close to the first connection end, and they are arranged protruding from the inner side wall of the air intake chamber 4631. The first guide 46311, the second guide 46312 and the third guide 46313 are arranged at intervals along the flow direction A after the cold air in the fifth pipe 462 enters the air intake chamber 4631. As shown in FIG. Figure 8As shown, the first guide member 46311, the second guide member 46312 and the third guide member 46313 are tiltedly arranged in the air inlet cavity 4631, and the angle β between the first guide member 46311, the second guide member 46312 and the third guide member 46313 and the flow direction A after the cold air in the fifth pipe 462 enters the air inlet cavity 4631 is an obtuse angle.

[0080] like Figure 7 As described, on a plane perpendicular to the center line of the air inlet channel 4632, a distance between a point on the side of the first guide member 46311 away from the center line of the air inlet channel 4632 and the center line of the air inlet channel 4632 is L, a distance between a point on the side of the second guide member 46312 away from the center line of the air inlet channel 4632 and the center line of the air inlet channel 4632 is M, and L is less than M. Furthermore, a straight-line distance between a point on the side of the first guide member 46311 away from the center line of the air inlet channel 4632 and the side of the air inlet cavity 4631 away from the center line of the air inlet channel 4632 is E, a straight-line distance between a point on the side of the second guide member 46312 away from the center line of the air inlet channel 4632 and the side of the air inlet cavity 4631 away from the center line of the air inlet channel 4632 is F, and E=2F. One end of the third guide member 46313 close to the center line of the air intake channel 4632 and the other end away from the center line of the air intake channel 4632 are respectively connected to the side walls of the air intake cavity 4631, and the third guide member 46313 is arranged at the end of the air intake cavity 4631. The third guide member 46313 is used to guide the flow of cold air on the one hand, and to close the air intake cavity 4631 on the other hand, to ensure that the cold air entering the air intake cavity 4631 can enter the gas mixing cavity 4633 through the air intake channel 4632.

[0081] The gas guide 4633 may be a conical structure, with its small end facing the third pipe 44, and its large end connected to the side wall of the gas mixing chamber 4633 through a cross-shaped mounting member 4634. The cross-shaped mounting member 4634 is a cross-shaped structure with four arms connected together, and the gas guide 4633 is arranged at the intersection of the four arms, so as to facilitate the installation of the gas guide 4633 on the center line of the gas mixing chamber 4633, and also facilitate the second-stage hot air to pass through the gas mixing chamber 4633 into the fourth pipe 45. Of course, the mounting member may also be other structures, as long as the gas guide 4633 can be arranged in the gas mixing chamber 4633, and the air can also flow into the fourth pipe 45 through the gas mixing chamber 4633.

[0082] In this embodiment, by providing the first guide 46311, the second guide 46312, the third guide 46313 and the gas guide 4633, when the cold air entering the accommodating chamber through the fifth channel flows in the accommodating chamber, due to the guidance of different guides, the cold air can evenly enter the gas mixing chamber 4633 through the air inlet channel 4632. In addition, due to the guiding effect of the gas guide 4633, the second-stage hot air flows into the fourth pipe 45 in a direction deviating from the center line of the third pipe 44, thereby accelerating the mixing of the second-stage hot air and the cold air entering the accommodating chamber through the fifth channel, so that the second-stage hot air can be quickly cooled to form the first-stage hot air.

[0083] In one embodiment, the gas guide assembly further includes a gas mixing member 4635; the gas mixing member 4635 is rotatably connected to the cross-shaped mounting member 4634; the gas guide member 4633 is connected to one end of the gas mixing member 4635 away from the cross-shaped mounting member 4634; specifically, the gas mixing member 4635 can be a fan composed of a plurality of blades. After the second-order hot air and cold air in the third pipe 44 enter the gas mixing chamber 4633, due to the action of the gas guide member 4633, the second-order hot air is driven to flow into the fourth pipe 45 in a direction deviating from the center line of the third pipe 44. During the flow, the second-order hot air contacts the blades and drives the blades to rotate; the rotation of the blades causes the blades to disturb the second-order hot air and cold air, thereby accelerating the mixing of the second-order hot air and cold air, so that the second-order hot air can be quickly cooled to form the first-order hot air.

[0084] In one embodiment, a guide portion 451 for guiding gas flow is provided on the inner side wall of the connecting end of the fourth pipe 45 and the pipe joint 463. The guide portion 451 can be an inclined surface provided on the inner side wall of the connecting end of the fourth pipe 45 and the pipe joint 463, so as to guide the first-stage hot air into the fourth pipe 45.

[0085] In one embodiment, there are two fifth pipes 462, and the air inlet chamber 4631 is divided into two fan-shaped sub-air inlet chambers 4631. The fifth pipes 462 and the sub-air inlet chambers 4631 are arranged one by one; each sub-air inlet chamber 4631 is provided with a first guide 46311, a second guide 46312 and a third guide 46313 for guiding the flow of air. By dividing the air inlet chamber 4631 into two fan-shaped sub-air inlet chambers 4631, the air in the air inlet valve 461 can quickly pass through the air inlet chamber 4631 and enter the gas mixing chamber 4633.

[0086] Working principle of a dry bean protein production system:

[0087] The feeding mechanism 13 receives the beans to be processed from the raw material outlet of the raw material bin 12 and transports them to the crushing chamber 231 of the crushing device 2. When the processing volume of beans to be processed increases, the raw material bin 12 with multiple raw material outlets and the corresponding multiple feeding mechanisms 13 are used to carry out the large-volume raw material transportation and processing. Accordingly, the multiple feeding mechanisms 13 can correspond to multiple crushing devices 2. Figure 1 , 2 There are three feeding mechanisms 13 corresponding to the three raw material outlets and the three crushing devices 2.

[0088] In the present technical solution, the feeding mechanism 13 and the bean feed port 232 to be processed can be connected through a feeding channel, and the feeding channel between the feeding mechanism 13 and the bean feed port 232 to be processed can also be connected to the heating device 4, and a temperature regulating mechanism 46 for cooling the second-stage hot air to the first-stage hot air is also provided between the two. The specific structure of the temperature regulating mechanism 46 can be seen above. The beans to be processed enter the feeding channel from the feeding mechanism 13, and are transported to the crushing chamber 231 under the action of the first-stage hot air generated by the heating device 4. After being crushed by the crushing mechanism 21 and meeting the screening requirements of the built-in classifier 22 of the crushing device 2, the beans are discharged from the bean powder discharge port 234 under the action of the first induced draft fan 9, and enter the airflow classifier 3 from the bean powder feed port, and the second-stage hot air enters the airflow classifier 3 under the action of the first induced draft fan 9. After being screened by the airflow classifier 3, the starch-rich material sinks to the bottom of the airflow classifier 3. The starch-rich material is collected by entering the second bag-type conveying dust collector 8 under the action of the third negative pressure fan to obtain the "starch-rich" component, and the bean powder feed port that goes out from the second discharge port at the top of the airflow classifier 3 enters the cyclone collector 5 through the first feed port. The cyclone collector 5 is the principle of the cyclone dust collector. The material enters the cyclone collector 5 tangentially. Under the action of centrifugal force, most of the material particles sink to the bottom of the cyclone collector 5 to obtain the first part of the protein component (protein I), while a small part of the granular material goes out from the second discharge port at the top of the cyclone collector 5 with the airflow. At this time, in this scheme, this small part of the granular material is passed through the first induced draft fan 9 from the second feed port into the chamber dust collector and collected again. Since the chamber pulse dust collector 6 is divided into many air chambers, each air chamber has many filter bags, combined with reverse pulse processing, it can efficiently collect a small amount of protein components entrained in the airflow going out from the top of the cyclone collector 5. The second protein component (protein-rich II) is deposited at the bottom of the chamber pulse dust collector 6. The first protein component (protein-rich I) and the second protein component (protein-rich II) enter the first bag-type conveying dust collector 7 through the first protein outlet and the second protein outlet through the feed pipe and the third feed port under the action of the second induced draft fan 10. The first bag-type conveying dust collector 7 combines the two protein components (protein-rich I and protein-rich II), separates them from the airflow through bag dust removal, and obtains the "protein-rich" component deposited in the first bag-type conveying dust collector 7, and then the "protein-rich" component is collected through the third protein outlet externally connected to the protein storage bin.

[0089] It can be understood that the beans to be processed in the feed channel between the feeding mechanism 13 and the feed port 232 for beans to be processed are transferred to the crushing chamber by the action of the first induced draft fan, that is, the feed channel is provided with a second air inlet for taking in the first-stage hot air (which can be a temperature regulating mechanism 46 connected to the second air inlet of the feed channel through a fourth pipe) and a fifth feed port connected to the feeding mechanism 13, the feeding mechanism uses the fifth feed port to transfer the beans to be processed to the feed channel, and then the first induced draft fan uses the second air inlet to introduce the first-stage hot air into the feed channel, and the wind pressure formed by the first induced draft fan in the feed channel drives the beans to be processed into the crushing chamber; in a specific implementation, one end of the feed channel can be connected to the second air inlet for taking in the first-stage hot air, and the other end is connected to the feed port for beans to be processed of the crushing chamber, and the fifth feed port can be provided between the second air inlet and the feed port for beans to be processed, so that the first induced draft fan can drive the processed beans to enter the crushing chamber.

[0090] In this embodiment, the graded impact mill crushes the beans to be processed under the first stage of hot air and controls the particle size through the built-in classifier 22, and performs the second step of classification and the first collection through the airflow classifier 3 and the cyclone collector 5 under the second stage of hot air to obtain the first part of protein material, and then collects the protein in the airflow material coming out of the cyclone collector 5 for the second time through the chamber pulse dust collector 6 to obtain the second part of protein material, and finally passes through the first bag-type conveying dust collector 7 to convey and separate the first part of protein material and the second part of protein material through airflow to obtain "protein-rich". This technical solution improves the extraction rate and purity of bean protein powder through the "second-stage temperature change" crushing and grading process.

[0091] The following is actual production data of a dry-process bean protein production method and system provided by this method:

[0092] Example 1:

[0093] The dry production method of bean protein powder is used to prepare pea protein powder:

[0094] Step 1: The control temperature of the air heating mechanism 41 (electromagnetic hot air furnace) is adjusted to 180°C, the control temperature of the temperature regulating mechanism 46 between the feed channel between the crushing device 2 and the feeding mechanism and the air heating mechanism 41 and the control temperature of the temperature regulating mechanism 46 between the crushing device 2 and the air heating mechanism 41 are set to 120°C, and the control temperature of the temperature regulating mechanism 46 on the second pipeline 43 is set to 180°C;

[0095] Step 2: The clean peeled peas (peeling rate greater than 98%) discharged from the raw material bin 12 are transported by the feeding mechanism 13 into the crushing device 2;

[0096] Step 3: The peas entering the crushing device 2 are crushed by the crushing mechanism 21 (frequency 40 Hz) under the action of the wind pressure generated by the first induced draft fan 9 (frequency 45 Hz), and the crushed pea powder is screened by the built-in classifier 22 (frequency 35 Hz) and discharged from the bean powder discharge port 234 as whole pea powder;

[0097] Step 4: The whole pea flour then enters the airflow classifier 3 (frequency 42 Hz), a part of it is discharged from the first discharge port at the top through the impeller rotor of the airflow classifier 3 and enters the cyclone collector 5, and the other part is discharged from the starch-rich discharge port at the bottom of the airflow classifier 3 to obtain rich starch;

[0098] Step 5: A portion of the pea flour entering the cyclone collector 5 is discharged through the second discharge port at the top and enters the chamber pulse dust collector 6, and the other portion is discharged from the first protein discharge port at the bottom end of the cyclone collector 5 to obtain protein-rich I; the pea flour entering the chamber pulse dust collector 6 is discharged from the second protein discharge port at the bottom end to obtain protein-rich II, and after the airflow is separated from the protein-rich II, it enters the first induced draft fan 9 from the first air outlet at the top end of the chamber pulse dust collector 6 and is discharged. The starch-rich material enters the second bag-type conveying dust collector 8 under the action of the wind pressure generated by the third induced draft fan 11, and then falls into the storage hopper from the lower discharge port and enters the unloading hopper through the measuring hopper for packaging; the air separated from the starch-rich material in the second bag-type conveying dust collector 8 is discharged by the third induced draft fan 11; the protein-rich material I and protein-rich material II enter the second bag-type conveying dust collector 8 under the action of the wind pressure generated by the second induced draft fan 10, and then enter the protein storage bin; the air separated from the protein-rich material in the second bag-type conveying dust collector 8 is discharged by the second induced draft fan 10.

[0099] In Example 1, the pea processing volume is 10 tons, the yield of the protein-rich product is 29.9% (mass percentage of the product and the raw material, the same below), the protein purity is 65.6% (dry basis, the same below), and the separation degree (R) between the protein-rich product and the starch-rich product is 0.41; the hardness value of the composite textured protein is 1900g, and the elasticity is 80%; the energy efficiency ratio of the heating device 4 is 98%.

[0100] Example 2:

[0101] The difference from Example 1 is that Figure 2 The air heating mechanism 41 of the first-stage hot air is a pipeline electromagnetic heater, and the control temperature is 100°C; the air heating mechanism 41 of the second-stage hot air is an electromagnetic hot air furnace, and the control temperature is adjusted to 190°C. The control temperature of the temperature adjustment mechanism 46 on the feed channel and the third pipeline 44 of the crushing device is set to 100°C, and the control temperature of the temperature adjustment mechanism 46 of the second pipeline 43 connected to the classifier is set to 190°C; the frequency of the built-in classifier 22 of the crushing device 2 is 38Hz, and the frequency of the airflow classifier 3 is 42Hz.

[0102] The yield of the protein-rich product is 30.2%, the protein purity is 65.3%, and the separation degree (R) between the protein-rich product and the starch-rich product is 0.40; the hardness value of the composite tissue protein is 1890g, and the elasticity is 82%; the energy efficiency ratio of the heating device 4 is 99%.

[0103] Example 3:

[0104] Different from Example 1, the control temperature of the air heating mechanism 41 (electromagnetic hot air furnace) is adjusted to 200°C, the control temperatures of the temperature regulating mechanism 46 between the feed channel between the crushing device 2 and the feeding mechanism and the air heating mechanism 41 and the temperature regulating mechanism 46 between the crushing device 2 and the air heating mechanism 41 are set to 130°C, and the control temperature of the temperature regulating mechanism 46 on the second pipeline 43 is set to 200°C; the frequency of the built-in classifier 22 of the crushing device 2 is 39Hz, and the frequency of the airflow classifier 3 is 45Hz.

[0105] The yield of the protein-rich product is 24.3%, the protein purity is 73.2%, and the separation degree (R) between the protein-rich product and the starch-rich product is 0.44; the hardness value of the composite tissue protein is 2430g, and the elasticity is 86%; the energy efficiency ratio of the heating device 4 is 97%.

[0106] Example 4:

[0107] Different from Example 1, the control temperature of the air heating mechanism 41 (electromagnetic hot air furnace) is adjusted to 220°C, the control temperatures of the temperature regulating mechanism 46 between the feed channel between the crushing device 2 and the feeding mechanism and the air heating mechanism 41 and the temperature regulating mechanism 46 between the crushing device 2 and the air heating mechanism 41 are set to 140°C, and the control temperature of the temperature regulating mechanism 46 on the second pipeline 43 is set to 220°C; the frequency of the built-in classifier 22 of the crushing device 2 is 45Hz, and the frequency of the airflow classifier 3 is 48Hz.

[0108] The yield of the protein-rich product is 22.2%, the protein purity is 75.9%, and the separation degree (R) between the protein-rich product and the starch-rich product is 0.46; the hardness value of the composite tissue protein is 2410g, and the elasticity is 90%; the energy efficiency ratio of the heating device 4 is 95%.

[0109] Example 5:

[0110] Different from Example 1, the control temperature of the air heating mechanism 41 (electromagnetic hot air furnace) is adjusted to 200°C, the control temperatures of the temperature regulating mechanism 46 between the feed channel between the crushing device 2 and the feeding mechanism and the air heating mechanism 41 and the temperature regulating mechanism 46 between the crushing device 2 and the air heating mechanism 41 are set to 150°C, and the control temperature of the temperature regulating mechanism 46 on the second pipeline 43 is set to 190°C; the frequency of the built-in classifier 22 of the crushing device 2 is 42Hz, and the frequency of the airflow classifier 3 is 48Hz.

[0111] The yield of the protein-rich product is 22.6%, the protein purity is 75.5%, and the separation degree (R) between the protein-rich product and the starch-rich product is 0.45; the hardness value of the composite tissue protein is 2370g, and the elasticity is 88%; the energy efficiency ratio of the heating device 4 is 95%.

[0112] Example 6:

[0113] The dry production method of bean protein powder is used to prepare mung bean protein powder:

[0114] The control temperature of the air heating mechanism 41 (electromagnetic hot air furnace) is adjusted to 185°C, the control temperatures of the temperature regulating mechanism 46 between the feed channel between the crushing device 2 and the feeding mechanism and the air heating mechanism 41 and the temperature regulating mechanism 46 between the crushing device 2 and the air heating mechanism 41 are set to 125°C, and the control temperature of the temperature regulating mechanism 46 on the second pipeline 43 is set to 185°C; the frequency of the built-in classifier 22 of the crushing device 2 is 42Hz, the frequency of the crushing mechanism 21 is 40Hz, the frequency of the airflow classifier 3 is 48Hz, and the frequency of the first induced draft fan 981 is 45Hz.

[0115] In this Example 6, the processing amount of mung beans is 8 tons, and the yield of the protein-rich product is 23.3% (mass percentage of product and raw material, the same below), the protein purity is 68.4% (dry basis, the same below), and the separation degree (R) between the protein-rich product and the starch-rich product is 0.40; the protein solubility is 68%, and the emulsification is 37m2 / g; the energy efficiency ratio of the heating device 4 is 98%.

[0116] Example 7:

[0117] Different from Example 6, Figure 2 The air heating mechanism 41 of the first-stage hot air is a pipeline electromagnetic heater, and the control temperature is 105°C; the air heating mechanism 41 of the second-stage hot air is an electromagnetic hot air furnace, and the control temperature is adjusted to 180°C. The control temperature of the temperature adjustment mechanism 46 on the feed channel and the third pipeline 44 of the crushing device is set to 105°C, and the control temperature of the temperature adjustment mechanism 46 of the second pipeline 43 connected to the classifier is set to 180°C; the frequency of the built-in classifier 22 of the crushing device 2 is 40Hz, and the frequency of the airflow classifier 3 is 45Hz.

[0118] The yield of the protein-rich product was 25.8%, the protein purity was 65.8%, and the separation degree (R) between the protein-rich product and the starch-rich product was 0.39; the protein solubility was 69%, and the emulsification was 34m2 / g; the energy efficiency ratio of the heating device 4 was 98%.

[0119] Example 8:

[0120] Different from Example 6, the control temperature of the air heating mechanism 41 (electromagnetic hot air furnace) is adjusted to 200°C, the control temperatures of the temperature regulating mechanism 46 between the feed channel between the crushing device 2 and the feeding mechanism and the air heating mechanism 41 and the temperature regulating mechanism 46 between the crushing device 2 and the air heating mechanism 41 are set to 138°C, and the control temperature of the temperature regulating mechanism 46 on the second pipeline 43 is set to 190°C; the frequency of the built-in classifier 22 of the crushing device 2 is 42Hz, and the frequency of the airflow classifier 3 is 48Hz.

[0121] The yield of the protein-rich product was 20.7%, the protein purity was 71.6%, and the separation degree (R) between the protein-rich product and the starch-rich product was 0.40; the protein solubility was 63%, and the emulsification was 38m2 / g; the energy efficiency ratio of the heating device 4 was 96%.

[0122] Comparative Example 1:

[0123] The difference from Example 1 is that there is no heating. The yield of the protein-rich product is 30.3%, the protein purity is 54.3%, and the separation degree (R) between the protein-rich product and the starch-rich product is 0.33; the hardness value of the composite textured protein is 1630g, and the elasticity is 61%.

[0124] Comparative Example 2:

[0125] The commercially available pea protein isolate (purity 80%) was added to starch to prepare a fibrous textured protein with a protein purity of about 66%. The hardness value of the composite textured protein was 1710 g and the elasticity was 68%.

[0126] Comparative Example 3:

[0127] The pea protein with a purity of about 66% in the comparative example 2 was first heated at 120°C for 30 seconds, and then transferred to 180°C for 20 seconds to prepare a fibrous tissue protein. The hardness of the composite tissue protein was 1782g and the elasticity was 73%.

[0128] Comparative Example 4:

[0129] The difference from Example 6 is that there is no heating. The yield of the protein-rich product is 31.0%, the protein purity is 58.7%, the separation degree (R) between the protein-rich product and the starch-rich product is 0.31; the protein solubility is 66%, and the emulsification is 26m2 / g.

[0130] Conventional protein separation processes generally try to reduce the material temperature during the crushing and separation process. In order to avoid protein denaturation and the decline of usage functions under high temperature conditions, measures such as setting a cooling water interlayer in the crushing chamber or configuring a cooling fan are often used to reduce the impact. However, this patent breaks through the process prejudice that protein separation cannot be performed under high temperature conditions. Through the "second-order temperature change", the beans to be processed are heated during the dry production of beans, that is, the first-order hot air is used to heat the beans to be processed in the crushing device 2, and the second-order hot air is used to heat the bean protein powder when the airflow classifier 3 is screened. , High-purity and high-yield bean protein powder. And the "second-order temperature change" environment affects the crushing, release and distribution of different protein components in the sample, and also obtains the modification of different protein components and between them by heat treatment; it also realizes the secondary heat treatment modification of protein, and improves the hardness and elasticity of protein used for fibrous tissue protein. This is different from the conventional treatment effect of heating protein alone, which greatly increases the regulation strategy of protein characteristics in production and further expands its application function and scope. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0131] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A dry production method of bean protein, characterized in that: The following steps are involved: The first-stage hot air heated by the first-stage temperature controller is transported to the crushing device by the wind pressure of the first induced draft fan, and the beans to be processed are transferred to the crushing device by the material transmission device for crushing to form bean powder with a particle size of not less than 300 meshes; The bean powder in the crushing device is transferred to the airflow classifier by the wind pressure of the first induced draft fan, and the second-stage hot air heated by the second-stage temperature controller is transported to the airflow classifier. The bean powder is screened by the airflow classifier and is divided into starch-rich components and light components. The starch-rich components are discharged from the starch-rich discharge port at the bottom of the airflow classifier, and the light components are fed into the cyclone separator through the bean powder feed port at the top of the airflow classifier by the first induced draft fan. Most of the light components entering the cyclone collector are discharged from the first protein outlet at the bottom of the cyclone collector to obtain protein-rich I. The airflow carrying a small amount of ultrafine powder enters the compartment pulse dust collector from the second outlet at the top of the cyclone collector for secondary collection. The second protein is discharged from the bottom of the compartment pulse dust collector to obtain protein-rich II, and the airflow is discharged from the outlet of the first induced draft fan. The protein-rich I and the protein-rich II enter the first bag-type conveying dust collector through the pipeline under the action of the airflow conveying force generated by the second induced draft fan, and are combined to obtain bean protein powder; The temperatures of the first-stage hot air and the second-stage hot air are different.

2. The method for producing bean protein by dry method according to claim 1, characterized in that: The temperature of the first-stage hot air is greater than the temperature of the second-stage hot air; And / or, the temperature range of the first stage hot air is 100°C to 150°C; And / or, the temperature range of the second stage hot air is 180°C to 220°C; and / or, the frequency range of the built-in classifier is 35 Hz to 45 Hz; and / or, the frequency range of the airflow classifier is 42 Hz to 48 Hz; And / or, the wind pressure of the first induced draft fan transfers the bean powder in the crushing device to the air flow classifier and the second-stage hot air heated by the second-stage temperature controller is transported to the air flow classifier, and the bean powder is screened by the air flow classifier and separated into starch-rich components and light components, the starch-rich components are discharged from the low-end discharge port of the air flow classifier, and the light components enter the cyclone separator through the top discharge port of the air flow classifier by the first induced draft fan, including: the starch-rich components enter the second bag-type conveying dust collector for collection through the action of the third induced draft fan.

3. A dry method for producing bean protein according to claim 2, characterized in that: The temperature range of the first stage hot air is 120°C to 140°C; And / or, the second stage hot air temperature ranges from 180°C to 200°C; And / or, the frequency range of the built-in classifier is 39 Hz to 42 Hz.

4. A dry production system for bean protein, characterized in that: It includes a material conveying device, a crushing device, an airflow classifier, a heating device, a cyclone collector, a chamber pulse dust collector, a first bag-type conveying dust collector, a second bag-type conveying dust collector, a first induced draft fan, a second induced draft fan and a third induced draft fan; The material conveying device is used to convey the beans to be processed into the crushing device; The crushing device is used to crush the beans to be processed to form bean powder with a particle size of not less than 300 meshes; The airflow classifier is used to screen the bean powder into starch-rich and light components; The cyclone collector is used to collect light components to form an airflow rich in protein I and carrying a small amount of ultrafine powder; The chamber pulse dust collector is used to collect protein-rich II in the airflow carrying a small amount of ultrafine powder; The first bag-type conveying dust collector is used to combine the protein-rich I and the protein-rich II to form bean protein powder; The second bag-type conveying dust collector is used to collect starch-rich; The heating device is used to heat the air to form first-stage hot air and second-stage hot air with different temperatures; The first induced draft fan is used to convey the first-stage hot air into the crushing device, to convey the bean powder in the crushing device to the airflow classifier, to convey the light components in the airflow classifier to the cyclone collector, to convey the airflow carrying a small amount of ultrafine powder in the cyclone collector to the chamber pulse dust collector, and to convey the second-stage hot air to the airflow classifier; The second induced draft fan is used to transfer the protein-rich I in the cyclone collector and the protein-rich II in the chamber pulse dust collector to the first bag-type conveying dust collector; The third induced draft fan is used to transfer the starch-rich material in the airflow classifier to the second bag-type conveying dust collector.

5. A bean protein dry production system according to claim 4, characterized in that: The crushing device comprises a crushing mechanism, a built-in classifier and a housing; A crushing chamber is provided in the shell, the crushing mechanism and the built-in classifier are arranged in the crushing chamber, the crushing mechanism is used to crush the beans to be processed in the crushing chamber, and the built-in classifier is used to classify and screen the bean powder; The side of the shell is provided with a bean feed port to be processed and a first air inlet connected to the crushing chamber; the top of the shell is provided with a bean powder discharge port for connecting to the first induced draft fan; The feed port for beans to be processed is connected to the material conveying device; the first air inlet is connected to the heating device; and the first induced draft fan conveys the first-stage hot air into the crushing chamber through the first air inlet.

6. A bean protein dry production system according to claim 5, characterized in that: There are multiple first air inlets, which are spaced apart along the circumferential direction and axial direction of the shell; the center line of the first air inlet and the bottom of the shell are arranged at an acute angle.

7. A dry method production system of bean protein according to any one of claims 4 to 6, characterized in that: The heating device comprises an air heating mechanism, a first pipeline, a second pipeline, a third pipeline, a fourth pipeline and a temperature adjustment mechanism; One end of the first pipeline is connected to the air heating mechanism, and the other end is connected to the second pipeline; one end of the second pipeline away from the first pipeline is connected to the airflow classifier; One end of the third pipeline is connected to the first pipeline, and the other end is connected to the temperature regulating mechanism; one end of the fourth pipeline is connected to the temperature regulating mechanism, and the other end is connected to the crushing device; The air heating mechanism is used to heat the air to form second-order hot air, and the temperature regulating mechanism is used to regulate the temperature of the second-order hot air in the third pipe to the temperature of the first-order hot air.

8. A bean protein dry production system according to claim 7, characterized in that: The temperature regulating mechanism includes an air inlet valve, a fifth pipeline, and a pipeline joint; One end of the pipeline joint is connected to the third pipeline, and the other end is connected to the fourth pipeline; The air inlet valve is connected to the pipe joint through the fifth pipe; the air inlet valve is used to transmit air with a temperature lower than the first-stage hot air temperature to the fourth pipe through the fifth pipe and the pipe joint to adjust the temperature of the second-stage hot air.

9. A bean protein dry production system according to claim 8, characterized in that: The pipeline joint includes an air inlet cavity, an air inlet channel and a gas mixing cavity; The air intake chamber is connected to the gas mixing chamber through the air intake channel; the air intake valve is connected to the air intake chamber through the fifth pipeline; The air inlet cavity is a circular ring structure, and the air inlet passage is a trumpet-shaped structure; the small end of the air inlet passage is arranged toward the gas mixing chamber; A first guide, a second guide and a third guide for guiding the flow of gas are arranged at intervals on a side wall of the air inlet cavity close to the center line of the air inlet passage; The first guide member and the second guide member are spaced apart from a side wall of the air intake cavity away from the center line of the air intake passage; On a cross section perpendicular to the center line of the air intake passage, a distance between a point on a side of the first guide away from the center line of the air intake passage and the center line of the air intake passage is smaller than a distance between a point on a side of the second guide away from the center line of the air intake passage and the center line of the air intake passage; One end of the third guide member away from the center line of the air intake passage is connected to a side wall of the air intake cavity away from the center line of the air intake passage; A gas guide and a cross-shaped mounting member are provided in the gas mixing chamber; the gas guide member is provided at the intersection formed by four arms of the cross-shaped mounting member, and the gas guide member is connected to the inner side wall of the gas mixing chamber through the cross-shaped mounting member; The gas guide member is used to guide the second-stage hot air to flow in a direction deviating from the center line of the third pipeline.

10. A bean protein dry production system according to claim 9, characterized in that: A gas mixing piece is also provided in the gas mixing chamber; the gas mixing piece is rotatably connected to the cross-shaped mounting piece; the gas guide piece is connected to an end of the gas mixing piece away from the cross-shaped mounting piece; And / or, a guide portion for guiding gas flow is provided on the inner side wall of the connecting end of the fourth pipeline and the pipeline joint; And / or, there are two fifth pipes, the air intake cavity is divided into two fan-shaped sub-air intake cavities, and the fifth pipes and the sub-air intake cavities are arranged in a one-to-one correspondence; each of the sub-air intake cavities is provided with a first guide member, a second guide member and a third guide member for guiding the air flow.

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