Spin-flow drying system and intelligent control method thereof

Abstract

The invention relates to a spin-flow drying system and an intelligent control method thereof. The system comprises a preheating drying unit, a constant-speed drying unit, a speed-reducing drying unit, a collecting unit and a control unit, the constant-speed drying unit is used for treating vinasse materials which are output by the preheating drying unit, have the water content within a medium range and are in a high-viscosity paste state, and the treated vinasse materials are conveyed to the speed-reducing drying unit. The method comprises the steps that operation parameter detection signals of all key assemblies in all drying units are collected in real time; according to the collected operation parameter detection signals, the current drying stage of the vinasse material and the physical property state of the vinasse material are judged; determining target operation parameters required by each drying unit based on a preset characteristic-parameter mapping relation; a control instruction corresponding to the target operation parameter is generated and sent to a driving assembly of the corresponding drying unit; and the operation parameters of the driving assemblies of the corresponding drying units are adjusted, so that the operation states of the drying units are matched with the characteristics of the materials treated by the drying units.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spin flow drying, in particular to a spin flow drying system and an intelligent control method thereof. BACKGROUND

[0002] The waste distiller's grains generated in the brewing process of Luzhou-flavor liquor have a significant high water content (usually maintained in the interval of 60%~75%) and complex physicochemical properties. The main components include incompletely fermented sugars, proteins, cellulose, and abundant volatile flavor substances and microbial metabolites. These properties together determine the special requirements of the waste in the drying process during pyrolysis pretreatment. As a key step in pyrolysis pretreatment, the core goal of drying is to effectively reduce the moisture content of the material to below 15% to ensure the stability of the pyrolysis reaction, energy utilization efficiency, and product quality, while avoiding the risk of equipment explosion or product contamination caused by the instantaneous release of steam during the pyrolysis process of high-moisture materials. The hot air drying technology is widely used as a basic processing method in the industry. This technology achieves water evaporation through direct contact between high-temperature gas flow and material, and has the advantages of simple equipment structure and controllable operation cost, making it suitable for large-scale waste treatment scenarios.

[0003] CN112374187A discloses a dry and quantitative conveying system for waste distiller's grains of Maotai-flavor liquor, which comprises a distiller's grains dryer and a dry distiller's grains quantitative conveyor. The feed inlet, exhaust chamber, observation chamber, first drying chamber and second drying chamber of the dryer are sequentially fixed on the dryer rack along the length direction, and the dryer conveyor belt is led out from the discharge end of the second drying chamber to the feed end of the dry distiller's grains quantitative conveyor. The exhaust chamber, observation chamber, first drying chamber and second drying chamber are sequentially sealed and communicated. An exhaust port is formed on the exhaust chamber, and an observation window is formed on the observation chamber. First drying chamber heater and second drying chamber heater are respectively arranged in the first drying chamber and the second drying chamber to heat the inside of the drying chamber. The system can realize continuous drying and quantitative conveying of waste distiller's grains of Maotai-flavor liquor to complete the pretreatment of waste distiller's grains generated in the brewing process of Maotai-flavor liquor, so as to prepare biomass pellet fuel in the subsequent process.

[0004] For the drying process of Luzhou-flavor liquor waste, the material properties show a clear stage evolution rule: in the initial stage, the material is high-moisture and low-viscosity paste (moisture content >60%), and it is necessary to quickly remove free water and achieve preliminary dispersion; in the transition stage, the material turns into medium-moisture and high-viscosity paste (moisture content 40%~60%), and the material viscosity increases significantly and the flowability decreases sharply; in the final stage, the material is low-moisture and granular (moisture content <40%), and the viscosity decreases significantly, and the focus is on the uniform removal of bound water and stable conveying of the material. This dynamic change process requires the drying equipment to have high adaptability in structure design and operating parameters to match the physical state and thermodynamic behavior of the material at different stages.

[0005] The prior art generally uses a single spin-flow dryer to process whole-stage distiller's grains, and the fixed structure parameters and operation logic cannot dynamically respond to the characteristic differences of the distiller's grains in the preheating, constant-speed and speed-reducing three drying stages, leading to a vicious cycle of material sticking to the wall, agglomeration and equipment blockage in the constant-speed drying stage. Specifically, the shear strength of the stirring assembly and the airflow parameter setting of the existing equipment cannot adapt to the viscosity fluctuations of high-viscosity paste-like materials, causing the material to form an adherent layer on the cavity wall and continuously accumulate into dense agglomerates, causing the equipment to stop running; at the same time, due to the system response lag, the drying efficiency is significantly reduced and the energy consumption continues to rise when frequently adjusting the stirring speed, airflow pressure and temperature and other parameters to cope with different stage characteristics; in addition, the hard-core agglomerates with high central moisture content and outer dry solidification formed due to the failure to timely solve the wall sticking problem in the constant-speed stage further aggravate the material conveying obstacles and product quality fluctuations in the subsequent speed-reducing stage, seriously hindering the large-scale promotion of the pyrolysis technology of brewing waste in the field of resource utilization.

[0006] In addition, on the one hand, there are differences in the understanding of those skilled in the art; on the other hand, a large number of literatures and patents have been studied by the applicant when making the present application, but due to the limitation of space, all the details and contents have not been listed in detail, which does not mean that the present application does not have these characteristics of the prior art, on the contrary, the present application has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art in the background art. SUMMARY

[0007] In view of the deficiencies of the prior art, the present application provides a self-spinning flow drying system and an intelligent control method thereof to solve at least part of the above technical problems.

[0008] The present application discloses a self-spinning flow drying system, which comprises a preheating drying unit, a constant-speed drying unit and a speed-reducing drying unit arranged in series along the flow direction of the distiller's grains, and the drying units are connected by a sealed material transfer device. The constant-speed drying unit processes the distiller's grains with medium moisture content and high-viscosity paste-like form output by the preheating drying unit, and the processed distiller's grains are transported to the speed-reducing drying unit. The speed-reducing drying unit comprises a cylindrical body, a double-shaft reverse variable-diameter shearing assembly and an annular wall-adhesion airflow shield assembly. The cylindrical body provides a closed processing space, the double-shaft reverse variable-diameter shearing assembly is installed in the middle region of the body and tears and disperses the high-viscosity paste-like material through an adaptive shearing structure, and the annular wall-adhesion airflow shield assembly is installed in the side wall region of the body and prevents the material from sticking to the wall by forming a supersonic gas film barrier close to the inner wall of the body. The system further comprises a collection unit and a control unit. The control unit can determine the current characteristic state of the distiller's grains according to the signals collected by the collection unit in the constant-speed drying unit, and generate corresponding adjustment instructions.

[0009] The present application realizes accurate matching of the physical and chemical properties of the distiller's grains at different drying stages by scientifically dividing the distiller's grains drying process into three independent drying units, namely preheating, constant speed and speed reduction.

[0010] According to a preferred embodiment, the top of the cylindrical body of the constant speed drying unit is provided with a material receiving port connected with the material receiving assembly; the bottom is provided with a material discharge port connected with the material discharge assembly; and the side wall is provided with an airflow interface corresponding to the position of the annular wall-adhering airflow shield assembly and connected with the hot air supply assembly.

[0011] The connection between the material receiving port and the material receiving assembly ensures smooth input of the high-viscosity paste-like material, avoiding accumulation and blockage of the feeding port due to high material viscosity; the connection between the material discharge port and the material discharge assembly ensures smooth output of the processed material, preventing sticking and blocking of the discharge port due to changes in material viscosity; and the connection between the side wall airflow interface and the hot air supply assembly ensures accurate introduction of compressed hot air required by the annular wall-adhering airflow shield assembly, maintaining the stability of the air film barrier. This structural design optimizes the flow path of the material in the constant speed drying unit, reduces the residence of the material at the boundary, fundamentally reduces the risk of wall sticking, and improves the drying efficiency.

[0012] According to a preferred embodiment, the double-shaft reverse variable-diameter shearing assembly includes two parallel and reverse rotating stirring shafts, variable-diameter shearing teeth, an electromagnetic clutch and a current sensor of the acquisition unit. The stirring shafts are driven by independent reduction motors through the electromagnetic clutch. The variable-diameter shearing teeth are hinged to the stirring shafts by cylindrical pins and automatically adjust the opening angle under the joint action of centrifugal force and material resistance. The current sensor is connected in series in the power supply circuit of the reduction motor and is communicatively connected with the control unit, for judging the material viscosity according to the motor current change and controlling the electromagnetic clutch to switch the speed gear position. The shearing teeth on the two stirring shafts of the double-shaft reverse variable-diameter shearing assembly are arranged in a staggered manner, and the edges of the shearing teeth are sharp-angled arc structures, so that the shearing teeth on one shaft mechanically scrape the surface of the other shaft when it rotates, realizing the self-cleaning function of the shearing teeth.

[0013] The double-shaft reverse variable-diameter shearing assembly realizes adaptive shearing and anti-sticking of high-viscosity paste materials through the cooperation of variable-diameter shearing teeth and staggered shearing teeth. The variable-diameter shearing teeth are hinged to the stirring shaft by a cylindrical pin and automatically adjust the opening angle under the joint action of centrifugal force and material resistance. When the viscosity of the material increases, the tooth opening increases to increase the shearing area; when the viscosity decreases, the tooth opening narrows to reduce energy consumption. The shearing teeth on the two stirring shafts are staggered by 15° and the edges of the tooth blades are sharp-angled arcs. When rotating in opposite directions, the shearing teeth of one shaft mechanically scrape the tooth surface of the other shaft, effectively removing the sticky material adhering to the tooth blades. The adaptive shearing and self-cleaning design ensures that the shearing structure is always in an efficient working state during the processing of high-viscosity materials, avoids the problem of "sticking and clumping" of traditional stirring shafts, and greatly reduces the risk of material clumping.

[0014] According to a preferred embodiment, the annular wall-adhesion airflow shield assembly comprises an annular air distribution chamber, a hyperbolic nozzle array, a segmented electric air valve, and a pressure transmitter of a collection unit. The annular air distribution chamber is divided into upper, middle, and lower sections along the height direction of the cylindrical body and is isolated from each other by partitions. Each section is provided with an airflow inlet and is connected to a hot air supply assembly by a hose. The hyperbolic nozzle array is uniformly arranged along the circumferential direction of the annular air distribution chamber. The nozzle outlet has a preset inclination angle relative to the side wall of the body to form a supersonic gas film that flows closely along the wall.

[0015] The annular wall-adhesion airflow shield assembly realizes source anti-sticking of high-viscosity paste materials through the cooperation of the hyperbolic nozzle array and the gas film barrier. The hyperbolic nozzle adopts a converging-diverging structure and accelerates the airflow to supersonic speed based on the Laval nozzle principle. The nozzle outlet has a 5° inclination angle with the chamber wall to ensure that the airflow flows closely along the wall to form an annular gas film with a thickness of 0.5-1 mm. The gas film prevents the material from contacting the wall through physical barrier action, and the shear force of the high-speed airflow peels off the thin sticky layer that has been formed. The peeled material particles fall into the double-shaft shearing zone with the airflow for secondary dispersion. This design enables the gas film barrier to precisely act on the critical point where the material contacts the wall, preventing the occurrence of wall sticking from the source and solving the technical problem that the airflow of existing equipment cannot effectively prevent high-viscosity materials from sticking to the wall.

[0016] According to a preferred embodiment, the segmented electric air valve comprises electric butterfly valves connected in series at the airflow inlets of each section of the annular air distribution chamber. The valve stem of the electric butterfly valve is connected to a stepper motor. The pressure transmitter is installed inside the annular air distribution chamber and is communicatively connected to the control unit for monitoring the airflow pressure and triggering the control unit to adjust the opening of the corresponding electric butterfly valve when the pressure is abnormal.

[0017] The segmented electrically operated air valve realizes the targeted regulation of air flow through pressure feedback control, solving the defect that the existing equipment cannot cope with local wall sticking in the whole uniform air flow. The pressure transmitter monitors the air flow pressure of each segment of the annular air distribution cavity in real time. When the pressure of a certain segment rises, indicating local wall sticking, the control unit triggers the corresponding electrically operated butterfly valve to increase the opening, increasing the air flow pressure and speed of that segment, and removing the wall sticking material through stronger air flow shear force. This segmented regulation mechanism accurately matches the air flow pressure with the wall sticking position, avoids the waste of invalid air flow, and improves the targeting and effectiveness of the air film barrier. At the same time, the precise opening control of the electrically operated butterfly valve ensures that the air flow pressure fluctuates within a safe range, maintaining the stability and anti-sticking effect of the air film, and significantly improving the continuous operation capability of the constant-speed drying stage.

[0018] According to a preferred embodiment, the control unit is built-in with a "characteristic-parameter mapping table" and a priority judgment logic, which can generate corresponding operation parameter adjustment instructions according to the key characteristic data obtained by the acquisition unit, and send the instructions to the driving members in each drying unit. The acquisition unit includes: a current sensor for detecting the motor current of the double-shaft reverse variable-diameter shearing assembly to reflect the material viscosity; an online microwave moisture content sensor for detecting the moisture content of the material at the inlet and outlet of each drying unit; a pressure transmitter for detecting the air flow pressure of the annular wall-adhesion air flow shield assembly to reflect the wall sticking degree; and an infrared distance measuring sensor for directly measuring the wall sticking thickness of the side wall of the constant-speed drying unit body.

[0019] The control unit integrates the key characteristic data of the material viscosity, moisture content, and wall sticking degree collected by the current sensor, online microwave moisture content sensor, pressure transmitter, and infrared distance measuring sensor, and establishes a corresponding relationship between the physical parameters and the equipment operation parameters. The priority judgment logic adjusts the parameter that has the greatest impact on the current stage according to the change trend of the material characteristics, ensuring that the system can dynamically adjust the operation parameters of each component according to the real-time state of the material during the drying process. This intelligent control strategy based on multi-parameter fusion avoids the lag of parameter adjustment, enabling the system to accurately match the changes in material characteristics and significantly improving the drying efficiency and continuous operation capability.

[0020] According to a preferred embodiment, during the transition period between the preheating drying unit and the constant-speed drying unit, when the online microwave moisture content sensor at the outlet of the preheating drying unit detects that the moisture content of the distiller's grains decreases to the critical interval of the transition from low sticky paste to high sticky paste, and the current sensor of the double-shaft reverse variable-diameter shearing assembly at the inlet of the constant-speed drying unit detects that the motor torque reaches the first threshold of the rated torque, the control unit determines that the distiller's grains are in the initial stage of viscosity rise, and generates a linkage adjustment instruction, including: increasing the stirring shaft speed and the opening angle of the shearing teeth of the double-shaft reverse variable-diameter shearing assembly, enhancing the air film strength of the annular wall-adhesion air flow shield assembly, and reducing the conveying speed of the sealed material transfer device.

[0021] The linkage adjustment instruction of the preheating and constant-speed transition stage effectively prevents the risk of wall sticking of high-viscosity materials at the initial stage of entering the constant-speed drying unit through the early intervention of collaborative control. When the detection of the moisture content of the vinasse drops to the critical interval and the current sensor detects that the motor torque reaches the threshold value, the control unit generates a linkage instruction: increase the stirring shaft speed and the opening angle of the shear teeth of the double-shaft reverse variable-diameter shearing assembly to enhance the tearing and dispersing effect on the initial sticky material; increase the gas film strength of the annular wall-sticking gas flow shield assembly to prevent the material from contacting the wall in advance; reduce the conveying rate of the sealed material transfer device to ensure that the initial sticky material has sufficient time to be dispersed in the constant-speed drying unit. This predictive adjustment mechanism based on the change of material characteristics enables the system to take preventive measures when the risk of wall sticking has not yet occurred, avoiding the early occurrence of wall sticking and laying the foundation for stable operation in the constant-speed drying stage.

[0022] According to a preferred embodiment, in the middle stage of the constant-speed drying unit, when the current sensor of the double-shaft reverse variable-diameter shearing assembly detects that the motor current exceeds the second threshold value of the rated current, the pressure transmitter of the annular wall-sticking gas flow shield assembly detects that the gas flow pressure rises above the pressure threshold, and the infrared distance sensor detects that the wall sticking thickness exceeds the thickness threshold, the control unit determines that the vinasse has entered the high-stick risk outbreak period and generates a linkage adjustment instruction, including: increasing the stirring shaft speed of the double-shaft reverse variable-diameter shearing assembly to the high-speed gear and opening the shear teeth to the maximum angle, simultaneously performing pulse blowback operation on the annular wall-sticking gas flow shield assembly and adjusting the opening degree of each section of the electric butterfly valve, and increasing the vibration frequency of the material discharge assembly and closing the bypass return channel.

[0023] The linkage adjustment instruction in the middle stage of the constant-speed unit effectively breaks the vicious cycle of wall sticking, clumping, and clogging through precise intervention of multiple components in deep collaboration. When the motor current exceeds the threshold, the gas flow pressure rises, and the wall sticking thickness exceeds the standard, the control unit triggers the linkage instruction: increase the stirring shaft speed of the double-shaft reverse variable-diameter shearing assembly to the high-speed gear and open the shear teeth to the maximum angle to maximize the shearing area and enhance the tearing effect on high-stick materials; perform pulse blowback operation on the annular wall-sticking gas flow shield assembly and adjust the opening degree of each section of the electric butterfly valve to enhance the gas flow shear force to remove wall sticking materials; increase the vibration frequency of the material discharge assembly and close the bypass return channel to prevent high-stick small particles from clogging the screen holes. This multi-parameter collaborative adjustment mechanism for the high-stick peak stage realizes precise intervention on wall sticking and clumping, ensuring continuous and efficient operation in the constant-speed drying stage.

[0024] According to a preferred embodiment, in the transition stage between the constant-speed drying unit and the reduced-speed drying unit, when the online microwave moisture content sensor at the outlet of the constant-speed drying unit detects that the moisture content of the vinasse has decreased to below 40% and the current sensor of the double-shaft reverse variable-diameter shearing assembly detects that the current has decreased to a third threshold value of the rated current, the control unit determines that the vinasse has entered the viscosity reduction period and generates linkage adjustment instructions, including: reducing the rotation speed of the stirring shaft of the double-shaft reverse variable-diameter shearing assembly and the opening angle of the shearing teeth, weakening the gas film intensity of the annular wall-adhesion airflow shield assembly, accelerating the conveying rate of the sealed material transfer device, and starting the heating program of the reduced-speed drying unit in advance to adapt to the incoming material state.

[0025] The linkage adjustment instructions in the constant-speed and reduced-speed transition stage ensure smooth transition of the material from the high-viscosity stage to the low-viscosity stage through pre-judgment parameter adjustment. When the moisture content of the vinasse is detected to be below 40% and the current sensor detects that the current has decreased to a threshold value, the control unit generates linkage instructions: reduce the rotation speed of the stirring shaft of the double-shaft reverse variable-diameter shearing assembly and the opening angle of the shearing teeth to avoid excessive shearing of the material with reduced viscosity; weaken the gas film intensity of the annular wall-adhesion airflow shield assembly to reduce energy consumption; accelerate the conveying rate of the sealed material transfer device to ensure smooth transition of the material; and start the heating program of the reduced-speed drying unit in advance to adapt the hot air temperature and airflow parameters to the incoming material state. This pre-judgment adjustment mechanism based on the change of material characteristics avoids lagging adjustment of drying parameters, ensures the continuity and stability of the material during the drying stage conversion, and improves the operating efficiency and product quality consistency of the entire drying system.

[0026] The present application also discloses an intelligent control method of a self-spinning flow transfer drying system, which comprises the following steps: S1, real-time acquisition of operation parameter detection signals of each key component in the preheating drying unit, the constant-speed drying unit and the reduced-speed drying unit; S2, judging the drying stage and the physical characteristic state of the current vinasse material according to the acquired operation parameter detection signals; S3, determining the target operation parameters required by each drying unit based on a pre-set characteristic-parameter mapping relationship; S4, generating control instructions corresponding to the target operation parameters and sending them to the driving components of the corresponding drying units; S5, adjusting the operation parameters of the driving components of the corresponding drying units to make the operation state of each drying unit match the characteristics of the material processed thereby. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a hardware connection diagram of a self-spinning flow transfer drying system according to a preferred embodiment of the present application; Figure 2is a structural schematic diagram of a constant-speed drying unit of a preferred embodiment provided by the present application; Figure 3 is a partial structural schematic diagram of a double-shaft reverse variable-diameter shearing assembly of a preferred embodiment provided by the present application; Figure 4 is a partial structural schematic diagram of a ring-shaped wall-adhering airflow shield assembly and a double-shaft reverse variable-diameter shearing assembly of a preferred embodiment provided by the present application; Figure 5 is a control logic schematic diagram of a control unit of a preferred embodiment provided by the present application; Figure 6 is a step flowchart of an intelligent control method of a drying system of a preferred embodiment provided by the present application.

[0028] List of reference signs 110: preheating drying unit; 120: constant-speed drying unit; 130: speed-reducing drying unit; 200: collecting unit; 210: current sensor; 220: online microwave moisture content sensor; 230: pressure transmitter; 240: infrared distance measuring sensor; 300: control unit; 400: cylindrical machine body; 410: double-shaft reverse variable-diameter shearing assembly; 411: stirring shaft; 412: variable-diameter shearing tooth; 413: cylindrical pin; 414: electromagnetic clutch; 420: ring-shaped wall-adhering airflow shield assembly; 421: ring-shaped air distribution cavity; 422: double-curved nozzle array; 423: segmented electric air valve; 424: hot air supply assembly; 425: hose; 430: material receiving assembly; 431: material receiving port; 440: material discharging assembly; 441: material discharging port. DETAILED DESCRIPTION

[0029] The present application will be described in detail below with reference to the accompanying drawings.

[0030] In the distiller's grains drying process, the distiller's grains present significantly different physical and chemical properties at different drying stages, and these properties directly determine the specific requirements for the structural design of the drying equipment and the operating parameters. When a single self-rotating flow dryer is used to process distiller's grains at all stages, it cannot simultaneously adapt to the requirements of each stage, which easily leads to a vicious cycle of wall sticking, clumping, and blocking, and there are technical defects such as high energy consumption, low drying efficiency, and unstable product quality. Based on this, the present application discloses a self-rotating flow drying system and an intelligent control method thereof, wherein, as shown in Figure 1 the self-rotating flow drying system can include multiple independent drying units, so that each drying unit can be designed and parameter-set only for the material properties of the corresponding stage.

[0031] Specifically, in the three stages of distiller's grains drying, the material characteristics of each stage are as follows: in the preheating stage, the moisture content of the distiller's grains is in a high range, and the material form is low sticky paste. The core requirement of this stage is to achieve the preliminary dispersion of the material and the efficient removal of free water. The existing self-circulating flow dryer has a stirring assembly and a hot air flow structure that can work together. The stirring assembly can preliminarily disperse the low sticky paste material, and the hot air flow can fully contact the dispersed material to achieve rapid removal of free water. In the constant-speed drying stage, the moisture content of the distiller's grains is reduced to a medium range, and the material form is changed to high sticky paste. This stage is the period of concentrated outbreak of distiller's grains wall sticking and agglomeration risk. The existing self-circulating flow dryer adopts a fixed structure design, and its stirring intensity and air flow parameters cannot adapt to the characteristics of high sticky paste material. Specifically, the shear force of the stirring assembly is insufficient to effectively break up the agglomerates formed by the high sticky material, and the air flow parameters cannot form a anti-sticking barrier for the cavity wall, resulting in a large amount of material sticking to the wall and further agglomeration, and finally causing equipment blockage. In the reduced-speed drying stage, the moisture content of the distiller's grains is reduced to a lower range, and the material form is solidified into granular, and the material viscosity is significantly reduced. The core requirement of this stage is to achieve the removal of bound water and the stable conveying of granular material. The air flow conveying assembly and the light stirring assembly of the existing self-circulating flow dryer can achieve the suspension movement of the granular material through air flow conveying, and can avoid local accumulation of the material through light stirring to ensure uniform removal of bound water. Moreover, due to the low viscosity of the material, it is not easy to stick to the wall and agglomerate. However, if wall sticking and agglomeration occur in the constant-speed drying stage, "hard core agglomerates" (high central moisture content and outer dry solidification) will be formed.

[0032] Therefore, if a single self-circulating flow dryer is used to process the whole-stage distiller's grains, the following technical contradictions will occur: the strong shear stirring assembly required for high sticky material in the constant-speed stage will cause excessive shear on the low sticky paste material in the preheating stage, resulting in too high dispersion of the material and increasing energy consumption, and will cause excessive wear on the granular material in the reduced-speed stage, affecting the quality of the finished product; the air flow parameters set for the preheating stage or the reduced-speed stage cannot form an effective anti-wall sticking effect in the constant-speed stage, and will still cause wall sticking, agglomeration and blockage; in addition, the single device needs to frequently adjust the stirring speed, air flow pressure, temperature and other parameters to adapt to the characteristics of the material in different stages, which not only complicates the operation, but also has a lag in parameter adjustment, and cannot match the changes in material characteristics in real time, resulting in low drying efficiency and increased energy consumption. Therefore, the present application splits the three stages into three independent drying units to complete, which can realize precise matching of the drying requirements of each stage and the functions of the equipment, significantly improve the drying efficiency, reduce the energy consumption, and avoid equipment blockage.

[0033] Preferably, as Figure 1As shown, the spin flow drying system can include a preheating drying unit 110, a constant speed drying unit 120, and a speed-reducing drying unit 130 connected in series along the flow direction of the distiller's grains, and the units are connected by sealed material transfer devices, which can realize closed conveying of the material and avoid leakage, moisture absorption, or pollution during the transfer process. Preferably, the spin flow drying system can be configured with a control unit 300 electrically connected with the driving assemblies and detection assemblies of the three drying units, which can receive the operation parameter detection signals of the drying units and adjust the operation parameters of the drying units according to the preset control logic, so that the operation states of the drying units are matched with the material characteristics, for example, the outlet temperature of the preheating drying unit 110 and the inlet temperature of the constant speed drying unit 120 are kept within a preset deviation range, the material processing capacity of the constant speed drying unit 120 is kept balanced with the material output of the preheating drying unit 110 and the material receiving capacity of the speed-reducing drying unit 130, and the residence time of the material in each unit is ensured to meet the drying requirements of the corresponding stage.

[0034] Preferably, the preheating drying unit 110 can adopt an existing spin flow drying machine, which includes a machine body, a stirring assembly, a hot air inlet assembly, a material feeding assembly, a material preliminary dispersion assembly, and a free water removal auxiliary assembly. The machine body is a cylindrical cavity structure, which provides a closed space for material drying. The stirring assembly is arranged inside the machine body and used for preliminarily dispersing the low-viscosity paste-shaped distiller's grains entering the machine body, so that the material is fully contacted with the hot air. The rotating speed of the stirring assembly is set to adapt to the dispersion range of the low-viscosity paste-shaped material, so as to ensure uniform dispersion of the material and avoid excessive shearing. The hot air inlet assembly is arranged at the lower part or the side part of the machine body and used for introducing hot air of a preset temperature into the machine body. The temperature of the hot air is set to adapt to the free water removal range, so as to realize efficient removal of free water in the low-viscosity paste-shaped material. The material feeding assembly is arranged at the upper part of the machine body and used for conveying the distiller's grains to be dried into the machine body. The material preliminary dispersion assembly is arranged at the outlet end of the material feeding assembly and cooperates with the stirring assembly to realize preliminary dispersion of the material, so as to avoid accumulation of the material at the feeding port. The free water removal auxiliary assembly includes a humidity detection sensor and a hot air flow adjusting valve. The humidity detection sensor is used for detecting the humidity of the material in the machine body. The hot air flow adjusting valve is electrically connected with the control unit 300 and adjusts the hot air inlet amount according to the humidity detection signal, so as to ensure stability of the free water removal effect.

[0035] Preferably, the constant-speed drying unit 120 can realize efficient dispersion, anti-wall-sticking protection and wall-sticking material recovery of high-viscosity material, and finally complete the preliminary removal of bound water in the material, while completely cutting off the vicious cycle of wall sticking, agglomeration and clogging, for the subsequent speed-reducing drying unit 130 to transport the material with stable form and significantly reduced viscosity. The constant-speed drying unit 120 is different from the "one-size-fits-all" structure of the existing self-circulating drying machine. The design of all components of the constant-speed drying unit 120 is based on the dynamic changes of high-viscosity paste-like material. It can adapt to the process that the viscosity of the material increases first and then slowly decreases with the reduction of moisture through the linkage of mechanical structure, ensuring that the material is always in a dispersed state and does not significantly stick to the wall and agglomerate during the entire constant-speed drying stage, while considering the drying efficiency and protection of the nutritional components of the material (such as avoiding excessive denaturation of protein).

[0036] Preferably, as shown in FIG. 1, from the overall structure, the constant-speed drying unit 120 can be configured as a vertical cylindrical special drying device, which includes a cylindrical body 400, a double-shaft reverse variable-diameter shearing assembly 410, an annular wall-sticking airflow shield assembly 420, a material receiving assembly 430 and a material discharging assembly 440. The double-shaft reverse variable-diameter shearing assembly 410 is responsible for solving the problem of agglomeration of high-viscosity material; the annular wall-sticking airflow shield assembly 420 is responsible for preventing material from sticking to the wall from the source; and the material receiving assembly 430 and the material discharging assembly 440 realize stable input and graded output of the material, respectively. Figure 2

[0037] Preferably, the cylindrical body 400 can provide a closed and stable processing space for the drying of high-viscosity material, and provide a mounting reference for each core functional assembly. The inner diameter and height of the cylindrical body 400 can be determined according to the preset material processing capacity and the residence time of the material in the constant-speed stage. Usually, the inner diameter is designed to fit the installation and operation space of the double-shaft reverse variable-diameter shearing assembly 410, and the height is designed to cover the three-section arrangement range of the annular wall-sticking airflow shield assembly 420, so as to ensure that the material can fully experience the dispersion, anti-sticking drying and recovery process in the body.

[0038] ​Preferably, to ensure the structural stability and heat preservation performance of the cylindrical body 400, the wall thickness of the cylindrical body 400 is designed according to the preset working pressure (mainly from the airflow pressure of the annular wall-adhering airflow shield assembly 420), and the wall thickness is in a range suitable for medium pressure working conditions to avoid deformation of the body due to airflow pressure. An insulation layer can also be provided on the outside of the body, which can be made of rock wool or polyurethane insulation material, to reduce heat exchange between the inside and outside of the body, maintain stable temperature in the body, and avoid burns caused by contact with high-temperature body by operators. The top of the cylindrical body 400 is provided with a material receiving port 431 connected with the material receiving assembly 430; the bottom is provided with a material discharge port 441 connected with the material discharge assembly 440; and the side wall is provided with an airflow interface corresponding to the position of the annular wall-adhering airflow shield assembly 420, which is connected with the hot air supply assembly 424. A maintenance door can also be provided on the outside of the body to facilitate maintenance and replacement of the internal components.

[0039] Preferably, as shown in Figure 2 and Figure 3 , the double-shaft reverse variable-diameter shearing assembly 410 is installed in the middle region inside the cylindrical body 400, and its core function is to tear and scatter the high-viscosity paste-like material entering the body through a shear structure with self-adaptive viscosity change, prevent the material from forming dense clumps, and avoid the phenomenon of material hanging and clumping (i.e., the viscous material adheres to the shear parts to form a material tumor that cannot be scattered). The assembly can include two parallel and reverse rotating stirring shafts 411, variable-diameter shearing teeth 412, an electromagnetic clutch 414, and a current sensor 210.

[0040] Preferably, the two stirring shafts 411 are arranged in parallel along the radial direction of the cylindrical body 400, and the shaft spacing is determined to ensure that the variable-diameter shearing teeth 412 can be engaged without interference, and the shaft spacing can be set in a range suitable for the maximum opening angle of the shearing teeth. Each stirring shaft 411 is driven by an independent reduction motor, and the motor output is connected with the stirring shaft 411 through the electromagnetic clutch 414, which can realize step adjustment of the rotating speed of the stirring shaft 411 by changing the transmission ratio, and then change the shearing strength. To realize stable rotation of the stirring shaft 411, the two ends of the stirring shaft 411 are connected with the side wall of the cylindrical body 400 through bearings, and a sealing element (such as a skeleton oil seal) can be provided outside the bearing to prevent dust or moisture in the body from entering the bearing and affecting the service life.

[0041] Preferably, a plurality of groups of variable-diameter shear teeth 412 can be uniformly arranged along the axial direction of each stirring shaft 411, each group can include two pieces of symmetrically distributed tooth blades, and the tooth blades as a whole can have an acute-angled arc structure. The roots of the tooth blades are connected to the stirring shaft 411 through a cylindrical pin 413, and the tooth blades can rotate around the cylindrical pin 413 within a preset angle range (the preset angle range can be set to 0°-60°). The end of the tooth blade at a preset distance from the hinge is fixed with a cylindrical counterweight, which can be used to drive the tooth blade to automatically adjust the opening angle when the viscosity of the material changes. When the viscosity of the material is relatively low (e.g., the viscosity is less than 5000 mPa·s), the centrifugal force generated by the rotation of the stirring shaft 411 dominates, and the counterweight drives the tooth blade to narrow to the minimum opening angle (limited by the limiting stopper arranged on the inner side of the tooth blade to avoid excessive closing of the tooth blade), at which time the shear area is small, reducing energy consumption. When the viscosity of the material increases (e.g., the viscosity is greater than 8000 mPa·s), the resistance of the material to the tooth blade increases, and the resistance overcomes part of the centrifugal force, causing the tooth blade to automatically open to a larger angle around the hinge, increasing the shear area and the engagement depth between the teeth, thereby strengthening the tearing effect on high-viscosity paste-like materials (e.g., breaking down lumps of a preset size into smaller particles).

[0042] Preferably, to avoid the adhesion of viscous materials to the shear teeth and form tumors, the variable-diameter shear teeth 412 of the two stirring shafts 411 are arranged in a staggered manner with a certain angle, i.e., the shear teeth on one shaft have a certain phase difference in the circumferential direction with the shear teeth on the other shaft, which can be, for example, 15°, and the edge of the tooth blade is designed as an acute-angled arc. When the two stirring shafts 411 rotate in opposite directions, the shear teeth on one shaft can pass from the root to the tip of the shear teeth on the other shaft, thereby removing the viscous material adhering to the tooth blade through mechanical scraping, achieving the self-cleaning function of the shear teeth. The current sensor 210 is connected in series in the power supply circuit of the reduction motor, which can detect the working current of the motor in real time. Since the motor current is positively correlated with the resistance of the material to the stirring shaft 411, and the resistance is positively correlated with the viscosity of the material, the current sensor 210 can indirectly determine the viscosity of the material by detecting the current. When the current is lower than a preset first threshold value (indicating that the viscosity of the material is relatively low), the electromagnetic clutch 414 remains in the low-speed gear; when the current is between the first threshold value and a second threshold value (indicating that the viscosity of the material is moderate), the electromagnetic clutch 414 switches to the medium-speed gear; and when the current exceeds the second threshold value (indicating that the viscosity of the material is relatively high), the electromagnetic clutch 414 switches to the high-speed gear, thereby increasing the shear strength through speed increase to achieve dynamic adaptation of the shear strength to the viscosity of the material.

[0043] Preferably, as Figure 2 and Figure 4As shown, the annular wall-adhering airflow shield assembly 420 is installed in the sidewall area inside the cylindrical body 400, and its core function is to prevent the high-viscosity paste material from contacting the wall by forming an ultrasonic air film barrier close to the inner wall of the body, and to peel off the thin sticky layer that has been formed to avoid the occurrence of wall sticking. The assembly can include an annular air distribution cavity 421, a hyperbolic nozzle array 422, a segmented electric air valve 423, and a pressure transmitter 230.

[0044] Preferably, the annular air distribution cavity 421 can be configured as a rectangular cross-section annular pipe structure, which is fixed to the inside of the inner wall of the body by multiple groups of supports. To achieve targeted adjustment of airflow, the annular air distribution cavity 421 is divided into upper, middle, and lower sections along the height direction of the cylindrical body 400, and the sections are isolated by partitions. Each section of the annular air distribution cavity 421 is independently connected to compressed hot air to avoid the influence of blockage of a certain section on the overall airflow supply. The side of each section of the annular air distribution cavity 421 is provided with an airflow inlet (with a range of hole diameters suitable for connecting the hose 425), which is connected to the hot air supply assembly 424 through a high-temperature-resistant hose 425. To ensure that the hot air entering the annular air distribution cavity 421 is clean and free of impurities, a hot air filtration assembly is also provided between the hot air supply assembly 424 and the annular air distribution cavity 421.

[0045] The hyperbolic nozzle array 422 is the core component for forming an ultrasonic air film, which can be made of brass. Brass has good thermal conductivity, which can prevent the condensation of water droplets in the nozzle and affect the air film. The overall structure is a contraction-expansion type to accelerate the airflow to supersonic speed based on the principle of Laval nozzle. The inlet diameter, throat diameter, and outlet diameter of the nozzle can be determined according to the acceleration requirements of the airflow, wherein the inlet diameter is larger than the throat diameter, and the outlet diameter is larger than the throat diameter, to ensure that the airflow is first contracted and accelerated to sonic speed in the nozzle, and then expanded and accelerated to supersonic speed. The hyperbolic nozzles are uniformly arranged along the circumferential direction of each section of the annular air distribution cavity 421, and multiple groups of nozzles are arranged at intervals between each section of the annular air distribution cavity 421. The nozzles are fixed to one side of the annular air distribution cavity 421 facing the inner wall of the body through threaded connection, and the outlet of the nozzle is inclined at a preset small angle (such as 5°) with the inner wall of the body, to ensure that the ejected supersonic airflow can flow close to the inner wall of the body, forming an annular air film with a thickness in a preset thinness range (such as 0.5-1 mm). This air film not only prevents the high-viscosity material from contacting the wall through the physical barrier effect of the airflow, but also provides weak heat to the material near the wall to assist in water removal, and peels off the thin sticky layer that has been attached to the wall through the shear force of the high-speed airflow. The peeled material particles fall into the biaxial reverse variable-diameter shearing assembly 410 below and are dispersed again to avoid secondary agglomeration.

[0046] Preferably, the segmented electric air valve 423 is matched with the pressure transmitter 230 to realize target regulation of air flow. A soft tube 425 is connected in series with an electric butterfly valve at the hot air inlet of each segment of the annular air distribution cavity 421, the valve stem of the electric butterfly valve is connected with a stepping motor to control the amount of hot air entering the corresponding segment of the annular air distribution cavity 421 by adjusting the valve opening degree (0%-100%). The pressure transmitter 230 is installed inside each segment of the annular air distribution cavity 421 to detect the air flow pressure in the cavity in real time. The pressure is positively correlated with the air film strength, and if the pressure is too low, the air film will break and the anti-sticking effect cannot be achieved. Under normal working conditions, the opening degree of all electric butterfly valves is kept at a preset intermediate opening degree (such as 50%), and the pressure in the annular air distribution cavity 421 is maintained at a preset normal pressure range (such as 0.2-0.3 MPa), and the air film is stable. When the pressure transmitter 230 in a certain segment detects that the pressure in the cavity exceeds the preset upper threshold, it indicates that there is a wall sticking phenomenon in the corresponding inner wall of the body, and some nozzles are blocked, resulting in increased air flow resistance. The pressure transmitter 230 sends a signal to the control unit 300, which drives the stepping motor of the corresponding segment to increase the opening degree of the electric butterfly valve (such as from 50% to 70%), increase the hot air volume of the segment, and increase the air flow speed to blow off the wall sticking material in the blocked nozzle by the stronger air flow shear force. When the pressure drops below the normal pressure range, the electric butterfly valve automatically returns to the intermediate opening degree, realizing targeted anti-sticking and avoiding the defect that the existing equipment cannot accurately respond to local wall sticking due to the full-range uniform air flow.

[0047] Preferably, the reduced-speed drying unit 130 can adopt an existing spin-flow rotary dryer, the core configuration of which includes a machine body, an airflow conveying assembly, a light stirring assembly, a hot air inlet assembly, a finished product discharge and screening assembly, and a combined water removal auxiliary assembly. The machine body is a cylindrical cavity structure, the internal space and airflow parameters of which are set to adapt to the conveying and drying of granular materials. The airflow conveying assembly is arranged at the lower part of the machine body, used to introduce hot air of a preset speed into the machine body, so that the granular materials are in a suspended or semi-suspended state, realizing stable conveying of the materials and removal of combined water. The light stirring assembly is arranged inside the machine body, the stirring intensity of which is lower than that of the double-shaft reverse variable-diameter shearing assembly 410 of the constant-speed drying unit 120, used to avoid local accumulation of the granular materials and ensure uniform heating of the materials. The hot air inlet assembly is arranged at the lower part or side of the machine body, used to introduce hot air of a preset temperature into the machine body, which is suitable for combined water removal. The finished product discharge and screening assembly is arranged at the lower outlet end of the machine body, including a screening net and a bypass return device, the screening net being used to separate possible oversized lumps in the dried materials, and the bypass return device being used to send the oversized lumps back to the previous equipment (such as the constant-speed drying unit 120 or the preheating drying unit 110) for secondary drying treatment, so as to avoid the influence of the oversized lumps on the quality as finished products. The combined water removal auxiliary assembly includes a moisture content detection sensor and a hot air temperature adjusting assembly, the moisture content detection sensor being used to detect the moisture content of the dried materials, and the hot air temperature adjusting assembly being electrically connected with the control unit 300, used to adjust the hot air temperature according to the moisture content detection signal, so as to ensure that the moisture content of the finished products meets the preset requirements.

[0048] Preferably, the spin-flow drying system can be triggered by the changes in key characteristics of the viscosity, moisture content, wall thickness, etc. of the distiller's grains during the drying process, and through the control unit 300 to drive the preheating drying unit 110, the constant-speed drying unit 120, the deceleration drying unit 130, and the core components (such as the double-shaft reverse variable-diameter shearing assembly 410, the annular wall-adhesion airflow shield assembly 420, the sealed material transfer device, etc.) in each unit to adjust the operating parameters synchronously, so as to avoid the loss of synergistic effect caused by the independent operation of a single component. The acquisition unit 200 configured in each drying stage of the spin-flow drying system can include: a current sensor 210 for detecting the viscosity of the distiller's grains, which is indirectly reflected as the motor current of the double-shaft reverse variable-diameter shearing assembly 410; an online microwave moisture content sensor 220 for detecting the moisture content of the distiller's grains, which is respectively arranged at the outlet of the preheating drying unit 110, the inlet and outlet of the constant-speed drying unit 120, and the inlet and outlet of the deceleration drying unit 130; a pressure transmitter 230 for detecting the airflow pressure of the annular wall-adhesion airflow shield assembly 420, which is indirectly reflected as the wall thickness; and an infrared distance measuring sensor 240 installed on the side wall of the middle section of the cylindrical body 400 of the constant-speed drying unit 120, which directly detects the wall thickness, so as to realize the real-time acquisition of the key characteristic parameters through the acquisition unit 200. The control unit 300 can adopt a PLC controller, which is internally provided with a "characteristic-parameter mapping table" and a priority judgment logic, and according to the signals acquired by the acquisition unit 200, the current characteristic state of the distiller's grains is determined, and the corresponding adjustment instructions are generated. The control unit 300 can send the generated adjustment instructions to the driving components (such as the reduction motor, the electromagnetic clutch 414, the stepping motor, the electromagnetic valve, the vibrator, etc.) of each component, so as to complete the adjustment of the operating parameters in response to the control instructions.

[0049] Preferably, as Figure 5As shown, in the transition stage from the preheating drying unit 110 to the constant-speed drying unit 120, when the online microwave moisture content sensor 220 at the outlet of the preheating drying unit 110 detects that the moisture content of the vinasse has dropped to the critical interval (e.g., 60% to 65%) for the transition from the low sticky paste to the high sticky paste, and the current sensor 210 of the double-shaft reverse variable-diameter shearing assembly 410 at the inlet of the constant-speed drying unit 120 detects that the motor torque has risen to the first threshold (e.g., 80%) of the rated torque, indicating that the viscosity of the vinasse has begun to rise, the control unit 300 determines that the "vinasse has entered the initial stage of viscosity rise", and then generates a linkage adjustment instruction: on the one hand, the double-shaft reverse variable-diameter shearing assembly 410 of the constant-speed drying unit 120 is driven, the stirring shaft 411 is raised from the low gear (adapted to low-viscosity materials) to the middle gear through the electromagnetic clutch 414, and the opening angle of the variable-diameter shearing teeth 412 is fine-tuned through the torque feedback (e.g., from 30° to 40°), thereby enhancing the tearing and dispersing effect on the initial sticky material; on the other hand, the annular wall-adhesion airflow shield assembly 420 of the constant-speed drying unit 120 is driven, the opening degree of the electric butterfly valve of the upper and middle annular air distribution cavities 421 is increased from 50% to 60%, and the airflow pressure is raised from 0.2 MPa to 0.25 MPa, thereby enhancing the strength of the air film close to the inner wall of the machine in advance, and avoiding the initial sticky material from contacting the wall surface; at the same time, the control unit 300 can also drive the sealed material transfer device connecting the preheating drying unit 110 and the constant-speed drying unit 120 to reduce the conveying rate of the screw feeder by 10%, so as to ensure that the initial sticky material has sufficient time to be dispersed in the constant-speed drying unit 120. If it is detected that the moisture content of the vinasse at the inlet of the constant-speed drying unit 120 decreases too quickly (e.g., below 55% within 1 minute), the control unit 300 can also send an instruction to the preheating drying unit 110 in the reverse direction, to reduce the hot air temperature of the hot air inlet assembly by 5-10°C, thereby slowing down the evaporation rate of free water and avoiding the risk of agglomeration caused by sudden rise in viscosity of the vinasse.

[0050] Preferably, as Figure 5As shown, in the constant-speed drying unit 120, when the viscosity reaches 5000-15000 mPa・s in the middle period, i.e. the high viscosity peak interval of 40%-60% of the moisture content of the distiller's grains, and the current sensor 210 of the double-shaft reverse variable-diameter shearing assembly 410 detects that the motor current exceeds the second threshold of the rated current (such as 120%), indicating that the viscosity reaches the peak, and the middle section pressure transmitter 230 of the annular wall-adhesion airflow shield assembly 420 detects that the airflow pressure rises to exceed the pressure threshold (such as 0.35 MPa), indicating that the middle section wall surface is adhesion to cause the nozzle to be partially blocked, and the infrared distance measuring sensor 240 detects that the adhesion thickness exceeds the thickness threshold (such as 1 mm), the control unit 300 determines that the distiller's grains enter the high-viscosity risk outbreak period, and generates a linkage adjustment instruction: for the double-shaft reverse variable-diameter shearing assembly 410, the stirring shaft 411 speed is increased to the high-speed gear (such as 250 r / min) through the electromagnetic clutch 414, and the variable-diameter shearing tooth 412 opening angle is increased to 60° to maximize the shearing area, and the self-cleaning function of the 15° staggered arrangement between the shafts is used to avoid the formation of material tumors on the shearing tooth; for the annular wall-adhesion airflow shield assembly 420, the middle section electric butterfly valve opening degree is increased from 60% to 70%, the airflow pressure is increased to 0.4 MPa, and the electromagnetic valve is driven to realize 3 seconds / second pulse backflushing to remove the adhesion material blocking the nozzle, and the upper and lower section electric butterfly valve opening degrees are simultaneously increased to 65% to prevent the adhesion from spreading to the upper and lower areas; for the material discharge assembly 440, the vibration frequency of the vibrator driving the inclined screen is increased by 50% to avoid the high-viscosity small particles after being broken up from blocking the screen holes, and the electric valve temporarily closing the bypass return channel is used to avoid the super-diameter lumps from being sent into the pre-dispersion cavity at this time to aggravate the blockage.

[0051] Preferably, as Figure 5As shown, in the transition stage of the constant-speed drying unit 120 and the reduced-speed drying unit 130, when the moisture content of the vinasse is reduced to below 40%, the viscosity begins to decrease, and the form transitions to semi-solid. When the online microwave moisture content sensor 220 at the outlet of the constant-speed drying unit 120 detects that the moisture content is reduced to 40%, and the current sensor 210 of the double-shaft reverse variable-diameter shearing assembly 410 detects that the current is reduced to the third threshold (such as 80%) of the rated current, it indicates that the viscosity has significantly decreased, and the control unit 300 determines that the vinasse has entered the viscosity reduction period, and generates a linkage adjustment instruction: on the one hand, the double-shaft reverse variable-diameter shearing assembly 410 is driven, the stirring shaft 411 is reduced from the high-speed gear to the medium-low gear (such as 200 r / min) through the electromagnetic clutch 414, and the opening angle of the variable-diameter shearing tooth 412 is narrowed to 45%, so as to avoid excessive shearing and cause the semi-solid material to be broken; on the other hand, the annular wall-adhesion airflow shield assembly 420 is driven, the electric butterfly valve openings of the three annular air distribution cavities 421 are all reduced to 55%, and the airflow pressure is restored to 0.25 MPa, so as to reduce the energy consumption while maintaining the basic anti-sticking air film. At the same time, the control unit 300 sends a speed-up instruction (such as an increase of 15% in the conveying rate) to the sealed material transfer device connecting the constant-speed drying unit 120 and the reduced-speed drying unit 130, and synchronously sends a preheating instruction to the reduced-speed drying unit 130, so as to drive the hot air inlet assembly of the reduced-speed drying unit 130 to advance the hot air temperature to the range suitable for water removal (such as 70-75°C), the airflow conveying assembly adjusts the air speed to the suspension rate suitable for the semi-solid material, and the light stirring assembly sets the rotation speed to the low gear (such as 100 r / min) in advance, so as to ensure that the vinasse can directly adapt to the drying requirements after entering the reduced-speed drying unit 130, and avoid uneven drying caused by parameter adjustment lag.

[0052] As shown in the accompanying drawings, Figure 6 The present application also discloses an intelligent control method of the spin flow drying system, which comprises the following steps: S1, real-time acquisition of the running parameter detection signals of the key components in the preheating drying unit 110, the constant-speed drying unit 120 and the reduced-speed drying unit 130; S2, determination of the drying stage and the physical characteristic state of the current vinasse material according to the acquired running parameter detection signals; S3, determination of the target running parameters required by each drying unit based on the pre-set characteristic-parameter mapping relationship; S4, generation of the control instructions corresponding to the target running parameters and sending to the driving assemblies of the corresponding drying units; S5, adjustment of the running parameters of the driving assemblies of the corresponding drying units, so that the running states of the drying units match the characteristics of the materials processed thereby.

[0053] It should be noted that the above-mentioned embodiments are only examples, and those skilled in the art can think of various solutions under the inspiration of the disclosure of the present application, and these solutions also belong to the disclosed range of the present application and fall within the protection scope of the present application. Those skilled in the art should understand that the specification and drawings of the present application are illustrative and not limiting to the claims. The protection scope of the present application is defined by the claims and their equivalents. The specification of the present application contains multiple inventive concepts, such as "preferably" or "according to a preferred embodiment", which means that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application according to each inventive concept. Throughout the text, the features introduced by "preferably" are only optional ways, and should not be understood as necessarily set, therefore the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A spin flash dryer system, characterized in that, It includes preheating drying unit (110), constant speed drying unit (120) and falling speed drying unit (130) arranged in series along the direction of the distiller's grains material flow, The constant speed drying unit (120) processes the distiller's grains material with medium range moisture content and high sticky paste form output by the preheating drying unit (110), and the processed distiller's grains material is delivered to the falling speed drying unit (130), which includes a cylindrical body (400), a double-shaft reverse variable-diameter shearing assembly (410) and an annular wall-adhering airflow shield assembly (420), the cylindrical body (400) provides a closed processing space, the double-shaft reverse variable-diameter shearing assembly (410) is installed in the middle region of the body and tears and scatters the high sticky paste material through the self-adaptive shearing structure, and the annular wall-adhering airflow shield assembly (420) is installed in the sidewall region of the body and prevents the material from adhering to the wall by forming an ultrasonic speed gas film barrier close to the inner wall of the body. It also includes a collection unit (200) and a control unit (300), The control unit (300) can determine the current characteristic state of the distiller's grains according to the signals collected by the collection unit (200) in the constant speed drying unit (120) and generate corresponding adjustment instructions.

2. The system of claim 1, wherein, The top of the cylindrical body (400) of the constant speed drying unit (120) is provided with a material receiving port (431) connected with a material receiving assembly (430), the bottom is provided with a material discharge port (441) connected with a material discharging assembly (440), and the sidewall is provided with an airflow interface corresponding to the position of the annular wall-adhering airflow shield assembly (420) and connected with a hot air supply assembly (424).

3. The system of claim 1 or 2, wherein, The double-shaft reverse variable-diameter shearing assembly (410) includes two parallel reverse rotating stirring shafts (411), variable-diameter shearing teeth (412), an electromagnetic clutch (414) and a current sensor (210) of the collection unit (200), the stirring shafts (411) are driven by independent speed reducing motors through the electromagnetic clutch (414), the variable-diameter shearing teeth (412) are hinged to the stirring shafts (411) through cylindrical pins (413) and automatically adjust the opening angle under the joint action of centrifugal force and material resistance, the current sensor (210) is connected in series in the power supply circuit of the speed reducing motor and is communicatively connected with the control unit (300) for judging the material viscosity according to the motor current change and controlling the electromagnetic clutch (414) to switch the speed gear position, wherein the shearing teeth on the two stirring shafts (411) of the double-shaft reverse variable-diameter shearing assembly (410) are arranged in a staggered manner, and the edges of the shearing teeth are sharp-angled arc structures, so that the shearing teeth on one shaft mechanically scrape the surface of the other shaft when it rotates, realizing the self-cleaning function of the shearing teeth.

4. The system of any one of claims 1 to 3, wherein, The annular wall-attached airflow shield assembly (420) comprises an annular air distribution chamber (421), a hyperbolic nozzle array (422), a segmented electric air valve (423), and a pressure transmitter (230) of the acquisition unit (200), the annular air distribution chamber (421) is divided into upper, middle, and lower three sections along the height direction of the cylindrical body (400) and is isolated from each other by partitions, each section is provided with an airflow inlet and is connected to a hot air supply assembly (424) through a hose (425), the hyperbolic nozzle array (422) is uniformly arranged along the circumferential direction of the annular air distribution chamber (421), and the nozzle outlet has a preset inclination angle relative to the side wall of the body, so as to form a supersonic air film flowing close to the wall.

5. The system of any one of claims 1 to 4, wherein, The segmented electric air valve (423) comprises electric butterfly valves connected in series at the airflow inlets of the annular air distribution chambers (421), the valve stem of the electric butterfly valve is connected to a stepping motor, the pressure transmitter (230) is installed inside the annular air distribution chamber (421) and is communicatively connected to the control unit (300), and is used for monitoring the airflow pressure and triggering the control unit (300) to adjust the opening degree of the corresponding electric butterfly valve when the pressure is abnormal.

6. The system of any one of claims 1-5, wherein, The control unit (300) is built-in with a "characteristic-parameter mapping table" and priority judgment logic, can generate corresponding operation parameter adjustment instructions according to the key characteristic data acquired by the acquisition unit (200), and send the instructions to the driving members in each drying unit, and the acquisition unit (200) comprises: a current sensor (210) for detecting the motor current of the double-shaft reverse variable-diameter shearing assembly (410) to reflect the material viscosity; an online microwave moisture content sensor (220) for detecting the moisture content of the material at the inlet and outlet of each drying unit; a pressure transmitter (230) for detecting the airflow pressure of the annular wall-attached airflow shield assembly (420) to reflect the wall sticking degree; an infrared distance measuring sensor (240) for directly measuring the wall sticking thickness of the side wall of the constant-speed drying unit (120).

7. The system of any one of claims 1-6, wherein, In the transition stage between the preheating drying unit (110) and the constant-speed drying unit (120), when the online microwave moisture content sensor (220) at the outlet of the preheating drying unit (110) detects that the moisture content of the vinasse drops to the critical interval of the transition from low sticky paste to high sticky paste, and the current sensor (210) of the double-shaft reverse variable-diameter shearing assembly (410) at the inlet of the constant-speed drying unit (120) detects that the motor torque reaches the first threshold of the rated torque, the control unit (300) determines that the vinasse enters the initial stage of viscosity rise, and generates a linkage adjustment instruction, including: increasing the rotating speed of the stirring shaft (411) of the double-shaft reverse variable-diameter shearing assembly (410) and the opening angle of the shearing teeth, enhancing the air film strength of the annular wall-attached airflow shield assembly (420), and reducing the conveying speed of the sealed material transfer device.

8. The system of any one of claims 1-7, wherein, When the current sensor (210) of the double-shaft reverse variable-diameter shearing assembly (410) detects that the motor current exceeds the second threshold of the rated current, the pressure transmitter (230) of the annular wall-sticking airflow shield assembly (420) detects that the airflow pressure rises to exceed the pressure threshold, and the infrared distance measuring sensor (240) detects that the wall-sticking thickness exceeds the thickness threshold, the control unit (300) determines that "the distiller's grains enter the high-sticking risk outbreak period" and generates linkage adjustment instructions, including: increasing the stirring shaft (411) speed of the double-shaft reverse variable-diameter shearing assembly (410) to the high-speed gear and opening the shearing teeth to the maximum angle, simultaneously performing pulse blowback operation on the annular wall-sticking airflow shield assembly (420) and adjusting the opening degree of each section of the electric butterfly valve, and increasing the vibration frequency of the material discharge assembly (440) and closing the bypass return channel.

9. The system of any one of claims 1-8, wherein, When the online microwave moisture content sensor (220) at the outlet of the constant-speed drying unit (120) detects that the moisture content of the distiller's grains decreases to below 40% and the current sensor (210) of the double-shaft reverse variable-diameter shearing assembly (410) detects that the current decreases to the third threshold of the rated current, the control unit (300) determines that "the distiller's grains enter the viscosity decline period" and generates linkage adjustment instructions, including: reducing the stirring shaft (411) speed and shearing tooth opening angle of the double-shaft reverse variable-diameter shearing assembly (410), weakening the air film strength of the annular wall-sticking airflow shield assembly (420), increasing the conveying rate of the sealed material transfer device, and starting the heating program of the reduced-speed drying unit (130) in advance to adapt to the incoming material state.

10. An intelligent control method for a spin flash drying system, characterized in that, It includes the following steps: S1, real-time acquisition of operation parameter detection signals of each key component in the preheating and drying unit (110), the constant-speed drying unit (120), and the reduced-speed drying unit (130); S2, determining the drying stage and physical property state of the current distiller's grains material according to the acquired operation parameter detection signals; S3, determining the target operation parameters required by each drying unit based on the pre-set characteristic-parameter mapping relationship; S4, generating control instructions corresponding to the target operation parameters and sending them to the driving components of the corresponding drying units; S5, adjusting the operation parameters of the driving components of the corresponding drying units to match the operation state of each drying unit with the characteristics of the material processed.

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