CN-122010035-A - Aseptic nitrogen filling pressure-flow cooperative control system for granule-containing high-viscosity orange juice

CN122010035ACN 122010035 ACN122010035 ACN 122010035ACN-122010035-A

Abstract

The invention belongs to a food and beverage sterile filling technology, and discloses a particle-containing high-viscosity orange juice sterile nitrogen filling pressure-flow cooperative control system which comprises a multi-source signal processing module, a rheological state identification module, a prediction cooperative decision module and an execution closed-loop control module, wherein the multi-source signal processing module is used for synchronously acquiring a pressure numerical sequence, a temperature numerical sequence and a voiceprint frequency spectrum vector of orange juice in a pipeline, the rheological state identification module is used for determining particle density index and particle size distribution probability of the orange juice in the current valve port area, inverting apparent viscosity value and thixotropic state parameters of the orange juice to form a comprehensive state signature, the prediction cooperative decision module is used for generating a control target instruction set according to the maximum shearing stress and further generating a pressure setting curve instruction and a displacement stroke curve instruction, and the execution closed-loop control module is used for responding to the pressure setting curve instruction to drive a liquid filling valve to execute opening operation based on the displacement stroke curve instruction so as to realize double target optimization of orange juice high-efficiency circulation and low damage filling.

Inventors

LU JIANGHUI
YANG ZHIFENG

Assignees

江苏鲜沛生物科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260408

Claims (10)

1. The aseptic nitrogen filling pressure-flow cooperative control system of the granule-containing high-viscosity orange juice is characterized by comprising the following components: The multi-source signal processing module is used for synchronously acquiring a pressure value sequence, a temperature value sequence and a voiceprint frequency spectrum vector of orange juice in the pipeline; The rheological state identification module is used for analyzing the voiceprint frequency spectrum vector, determining the particle density index and the particle size distribution probability of the orange juice in the current flowing valve port area, inverting the apparent viscosity value and the thixotropic state parameter of the orange juice through the pressure value sequence and the temperature value sequence, and further forming a comprehensive state signature; the prediction collaborative decision module is used for simulating pipeline flow velocity field distribution based on the comprehensive state signature to predict the maximum shear stress, generating a control target instruction set according to the maximum shear stress, and further carrying out pressure-flow decoupling decision on the control target instruction set to respectively generate a pressure setting curve instruction and a displacement travel curve instruction; and the execution closed-loop control module is used for responding to the pressure setting curve instruction to adjust the sterile nitrogen pressure, driving the liquid filling valve to execute opening operation based on the displacement travel curve instruction after determining the ready signal of the driving pressure field, and simultaneously carrying out filling regulation and control by monitoring the instantaneous mass flow rate flowing through the valve port.
2. The aseptic nitrogen-filled filling pressure-flow cooperative control system for granule-containing high-viscosity orange juice according to claim 1, wherein the specific process of synchronously obtaining the pressure value sequence, the temperature value sequence and the voiceprint spectrum vector of the orange juice in the pipeline is as follows: Analog pressure signals, analog temperature signals and analog pipe wall vibration signals of orange juice in the pipeline are synchronously collected, analog-to-digital conversion operation is carried out on the analog pressure signals, the analog temperature signals and the analog pipe wall vibration signals, and an original pressure digital sequence, an original temperature digital sequence and an original sound wave time domain sequence are respectively generated; The method comprises the steps of carrying out high-frequency noise and instantaneous interference filtering on an original pressure digital sequence and an original temperature digital sequence to obtain a pressure numerical sequence and a temperature numerical sequence, carrying out fast Fourier transform operation on an original sound wave time domain sequence, extracting amplitude energy distribution data in a particle impact characteristic frequency band from the obtained sound wave frequency domain sequence, and generating a voiceprint frequency spectrum vector.
3. The aseptic nitrogen-filled, pressure-flow cooperative control system for granule-containing high-viscosity orange juice according to claim 2, wherein the specific process of analyzing the voiceprint spectral vector is as follows: constructing a concentration-spectral kurtosis lookup table and a particle size-energy ratio lookup table based on a standard orange juice particle sample, wherein the concentration-spectral kurtosis lookup table stores the mapping relation between each particle density index and the acoustic wave spectral kurtosis value; Calculating a fourth-order spectrum moment of the voiceprint spectrum vector to obtain a spectral kurtosis value, and inquiring a concentration-spectral kurtosis lookup table based on the spectral kurtosis value to determine a particle density index of orange juice in a current flowing valve port area; and inquiring a particle size-energy ratio lookup table based on the frequency band energy ratio of the low-frequency resonance sub-band and the high-frequency friction sub-band in the voiceprint frequency spectrum vector to determine the particle size distribution probability of the orange juice in the current flowing valve port area.
4. The aseptic nitrogen-filled, pressure-flow cooperative control system for granule-containing high viscosity orange juice according to claim 3, wherein the specific process of forming the integrated status signature is: Acquiring a physical geometric constant of a pipeline, and performing mechanical conversion on a differential processing result of a pressure numerical sequence based on the physical geometric constant to determine a shearing stress value of orange juice acting on a pipe wall; performing iterative inversion on the rheological property of the orange juice based on the temperature numerical sequence and the pipe wall shear stress value to obtain the apparent viscosity value and the current shear rate of the orange juice; calculating the deviation of the apparent viscosity value relative to the expected equilibrium viscosity value under the current shear rate, and comprehensively evaluating the variation rate of the apparent viscosity value in a preset sliding time window to determine the thixotropic state parameter of the orange juice; and (3) splicing the particle density index, the particle size distribution probability, the apparent viscosity value and the thixotropic state parameter to form the comprehensive state signature of the orange juice.
5. The aseptic nitrogen-filled, pressure-flow cooperative control system for granule-containing high viscosity orange juice according to claim 4, wherein the specific process of predicting the maximum shear stress is: performing equivalent conversion on the particle density index and the particle size distribution probability of the particles to form an equivalent roughness coefficient and an effective flow cross section reduction factor; establishing a radial momentum conservation equation based on a real-time rheological relation, an equivalent roughness coefficient and an effective flow cross section reduction factor, and carrying out numerical integration solution on the radial momentum conservation equation through collecting physical geometric boundaries of a pipeline to obtain pipeline flow velocity field distribution of orange juice; performing spatial gradient operation on the pipeline flow velocity field distribution to obtain shear rate distribution, and performing stress conversion on the shear rate distribution by combining a real-time rheological relationship to determine the shear stress distribution in the pipeline; And (3) performing extremum searching on the valve core diameter reduction position and the pipe wall boundary layer in the in-pipe shear stress distribution, and determining the searched stress peak value as the maximum shear stress under the current working condition.
6. The aseptic nitrogen-filled, pressure-flow cooperative control system for granule-containing high viscosity orange juice according to claim 5, wherein the specific process of generating the control target instruction set according to the maximum shear stress is as follows: Calculating a difference allowance between a preset shear tolerance threshold and a maximum shear stress, carrying out inverse fluid mechanics iterative solution on the difference allowance by taking a constraint condition that the maximum shear stress does not exceed the shear tolerance threshold, and determining the maximum volume flow allowed to pass through a pipeline; Respectively defining a maximum volume flow and a shear tolerance threshold as a flow target value and a shear force limiting boundary under the current working condition; linearly superposing viscous friction resistance, particle stacking resistance and yield starting pressure which are respectively formed based on apparent viscosity value, particle density index and thixotropic state parameter quantification, and carrying out normalization processing on total pressure gain obtained by superposition to generate a flow resistance compensation coefficient; And packing the flow target value, the shearing force limiting boundary and the flow resistance compensation coefficient to form a control target instruction set.
7. The aseptic nitrogen-filled, pressure-flow cooperative control system for granule-containing high-viscosity orange juice of claim 6, wherein the specific process of making a pressure-flow decoupling decision for the control target instruction set is as follows: Obtaining a basic filling back pressure value corresponding to a flow target value, superposing the basic filling back pressure value and a flow resistance compensation coefficient, and determining a target total pressure value for overcoming the current comprehensive flow resistance; generating a pressure setting curve instruction of the nitrogen proportional regulating valve based on the feedforward overdrive logic and a dynamic pressure track which comprises a high-amplitude pulse of an initial section and a target value of a steady-state section; And performing smooth displacement track planning based on the minimum lift height to generate a displacement travel curve instruction of the liquid filling valve.
8. The particulate-containing high viscosity orange juice aseptic nitrogen filling pressure-flow cooperative control system of claim 7, wherein the specific process of adjusting the aseptic nitrogen pressure in response to the pressure setting curve command is: Analyzing the pressure setting curve instruction into a driving current in a corresponding range, controlling a nitrogen proportion regulating valve to execute gas injection operation, and monitoring the actual gas pressure in the sterile buffer tank in real time; setting an allowable error range, and outputting a driving pressure field ready signal if the fluctuation amplitude of the actual air pressure in the continuous sampling period is converged to be within the allowable error range of the target total pressure value.
9. The granular high viscosity orange juice aseptic filling pressure-flow cooperative control system according to claim 8, wherein the specific process of driving the liquid filling valve to perform the opening operation based on the displacement travel curve command is as follows: And monitoring acoustic emission signals of the valve core-valve seat area in real time, and if the acoustic emission signals are detected to contain characteristic high-frequency friction voiceprints, overlapping preset sine flutter signals on the current displacement stroke curve instruction to eliminate the characteristic high-frequency friction voiceprints.
10. The aseptic nitrogen-filled, pressure-flow cooperative control system for granular high viscosity orange juice according to claim 9, wherein the specific process of filling regulation by monitoring the instantaneous mass flow rate through the valve port is: The method comprises the steps of collecting instantaneous mass flow rate flowing through a valve port, establishing an actual flow path of orange juice, comparing accumulated filling quantity obtained based on integral operation of the actual flow path with target filling quantity, and determining residual filling quantity; If the average ideal flow rate is continuously higher than the actual flow rate of orange juice and the acoustic emission signal shows particle agglomeration characteristics, judging that the flow resistance is abnormally increased; and adding the extra pressure increment to the pressure setting curve instruction to drive the proportional regulating valve to increase the opening degree until the accumulated filling quantity reaches the target filling quantity.

Description

Aseptic nitrogen filling pressure-flow cooperative control system for granule-containing high-viscosity orange juice Technical Field The invention relates to a food and beverage sterile filling technology, in particular to a granular high-viscosity orange juice sterile nitrogen-filling pressure-flow cooperative control system. Background In the food and beverage industry, aseptic filling of high-viscosity beverages containing real fruit particles is a very challenging process, and the fluid belongs to typical solid-liquid two-phase non-Newtonian fluid, and the current industry mainly adopts an aseptic nitrogen filling back pressure filling technology. In the prior art, aseptic nitrogen filling back pressure filling is generally carried out based on PID feedback control logic, namely, the instantaneous flow rate fed back by a flowmeter is used as a core control variable, and then the opening of a valve or the nitrogen back pressure of a buffer tank is singly regulated to maintain a set productivity index, however, when orange juice with obvious non-Newtonian rheological property and multiphase suspended particles is processed, the prior art scheme lacks the capability of real-time perception and prediction of a shear stress field in a fluid, and is difficult to synergistically balance the contradiction between the shear force protection and the fluxion guarantee in the filling process, for example, when orange juice with high pulp content is produced, in order to meet the high productivity requirement, the high back pressure is usually set, under the working condition, the instantaneous shear rate of the fluid flowing through the reducing part of a valve core is extremely easy to be greatly increased, so that large-diameter full fruit cells are torn into floccule fibers by strong shear force, and the taste experience of real fruit particles is seriously damaged, otherwise, if the pressure is simply reduced to protect the fruit particles, and the high-viscosity fluid is easy to thicken and the particles are agglomerated in a low-shear area, and valve port blocking is caused. In view of the above, the present invention proposes a pressure-flow cooperative control system for aseptic nitrogen-filled filling of orange juice with high viscosity containing particles to solve the above-mentioned problems. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides the following technical scheme that the aseptic nitrogen-filled filling pressure-flow cooperative control system for the granule-containing high-viscosity orange juice comprises the following components: The multi-source signal processing module is used for synchronously acquiring a pressure value sequence, a temperature value sequence and a voiceprint frequency spectrum vector of orange juice in the pipeline; The rheological state identification module is used for analyzing the voiceprint frequency spectrum vector, determining the particle density index and the particle size distribution probability of the orange juice in the current flowing valve port area, inverting the apparent viscosity value and the thixotropic state parameter of the orange juice through the pressure value sequence and the temperature value sequence, and further forming a comprehensive state signature; the prediction collaborative decision module is used for simulating pipeline flow velocity field distribution based on the comprehensive state signature to predict the maximum shear stress, generating a control target instruction set according to the maximum shear stress, and further carrying out pressure-flow decoupling decision on the control target instruction set to respectively generate a pressure setting curve instruction and a displacement travel curve instruction; and the execution closed-loop control module is used for responding to the pressure setting curve instruction to adjust the sterile nitrogen pressure, driving the liquid filling valve to execute opening operation based on the displacement travel curve instruction after determining the ready signal of the driving pressure field, and simultaneously carrying out filling regulation and control by monitoring the instantaneous mass flow rate flowing through the valve port. Further, the specific process of synchronously acquiring the pressure value sequence, the temperature value sequence and the voiceprint frequency spectrum vector of the orange juice in the pipeline is as follows: Analog pressure signals, analog temperature signals and analog pipe wall vibration signals of orange juice in the pipeline are synchronously collected, analog-to-digital conversion operation is carried out on the analog pressure signals, the analog temperature signals and the analog pipe wall vibration signals, and an original pressure digital sequence, an original temperature digital sequence and an original sound wave time domain sequence are respectively generated; The method comprises the steps of carryin