Defoaming agent performance monitoring method for liquid industrial production

Abstract

The invention discloses a defoaming agent performance monitoring method for liquid industrial production, and particularly relates to the field of defoaming agent performance monitoring, which comprises the following steps: acquiring stirring data information and temperature data information of liquid in an industrial production process in real time through a sensor, generating a precondition I based on the stirring data information, and generating a precondition II based on the precondition I; generating a precondition II based on the temperature data information; if the precondition I or the precondition II is judged to be abnormal, performing preliminary screening; during the preliminary screening, collecting a bubble generation rate and a liquid physical property change value; according to the scheme, the problem of influence of bubble generation and defoaming agent decomposition on performance detection and evaluation under high-speed stirring and high-temperature conditions is solved through a multi-layer monitoring system of real-time data acquisition, anomaly screening, life cycle modeling and coupling sensitivity verification.

Description

Technical Field

[0001] The present invention relates to the technical field of defoamer performance monitoring, and more specifically, to a defoamer performance monitoring method for liquid industrial production. Background Art

[0002] In the prior art, liquid industrial production covers many fields such as chemical industry, food processing, biopharmaceuticals, petroleum refining, textile printing and dyeing, etc. These production processes generally involve liquid stirring, mixing, reaction, transportation and other operations. Therefore, the production process is often accompanied by the problem of bubble generation. The generation of bubbles may lead to reduced reaction efficiency, damaged equipment performance, and reduced product quality.

[0003] Defoaming agents are used when a large amount of foam is generated in liquid industrial production and the foam affects equipment operation, production efficiency or product quality. Monitoring the performance of defoaming agents can ensure the effectiveness of their anti-foaming and anti-foaming effects, thereby improving production efficiency and product quality. However, the high-speed stirring and high-temperature conditions in liquid industrial production will synergistically accelerate bubble generation and defoaming agent decomposition, affecting the overall detection and evaluation of defoaming performance. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a defoaming agent performance monitoring method for liquid industrial production, which solves the problems raised in the above-mentioned background technology through a multi-level monitoring system of real-time data acquisition, anomaly screening, life cycle modeling and coupled sensitivity verification.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for monitoring the performance of a defoaming agent for liquid industrial production, comprising:

[0006] The stirring data information and temperature data information of the liquid in the industrial production process are obtained in real time through sensors, and precondition one is generated based on the stirring data information, and precondition two is generated based on the temperature data information; if precondition one or precondition two is judged to be abnormal, a preliminary screening is performed;

[0007] During the preliminary screening, the bubble generation rate and the liquid property change value are collected; when the bubble generation rate is greater than the preset bubble generation rate threshold, and the liquid property change value exceeds the preset liquid property change threshold, the bubble generation rate and the liquid property change value at this time are determined to be the critical conditions determined by the preliminary screening;

[0008] Based on the critical conditions determined in the preliminary screening, the entire life cycle of microbubbles from generation to aggregation and rupture was observed using imaging and fluid monitoring, and a bubble life cycle model was established based on scales 1 and 2.

[0009] Scale 1 includes bubble nucleation diameter and interface diffusion gradient; Scale 2 includes foam thickness and bubble aggregation rate;

[0010] The bubble life cycle value is calculated based on the bubble life cycle model. If the bubble life cycle value deviates from the preset bubble life cycle threshold range, it is determined that the bubble rupture rate is reduced or the interface characteristics are disordered, and the temperature-agitation coupling effect is introduced. The sensitivity of the defoaming agent to the synergistic conditions is verified by controlling the temperature gradient and shear rate changes. When the temperature-agitation coupling effect has a nonlinear effect on the bubble behavior, the performance evaluation stage is entered.

[0011] In a preferred embodiment, the stirring data information includes eddy shear rate and pressure fluctuation amplitude; the eddy shear rate is used to characterize the shear force intensity caused by eddy current during the stirring process of the liquid; the pressure fluctuation amplitude is used to characterize the bubble nucleation and growth caused by the uneven pressure distribution during the stirring of the liquid;

[0012] Temperature data information includes surface tension temperature gradient and liquid evaporation rate; the surface tension temperature gradient is used to characterize the rate of change of liquid surface tension at the peak temperature, which affects the stability of bubbles and the diffusion efficiency of the defoaming agent; the liquid evaporation rate is used to characterize the aggregation and surface shrinkage effects of bubbles caused by it.

[0013] In a preferred embodiment, the first precondition includes: if the eddy shear rate is greater than a preset eddy shear rate threshold, and the pressure fluctuation amplitude is greater than a preset pressure fluctuation amplitude threshold, it is determined to be abnormal;

[0014] Precondition 2 includes: if the surface tension temperature gradient is greater than a preset surface tension temperature gradient threshold, and the liquid evaporation rate is greater than a preset liquid evaporation rate threshold, it is determined to be abnormal.

[0015] In a preferred embodiment, the eddy shear rate is calculated based on the stirring data information; the pressure fluctuation amplitude is calculated based on the stirring data information;

[0016]

[0017] in is the eddy shear rate; u and v represent the velocity components of the liquid in the x-axis and y-axis directions respectively; Used to describe the rate of change of velocity u when the position of the liquid changes in the y-axis direction; It is used to describe the rate of change of velocity v when the position of the liquid changes in the x-axis direction; V is the volume of the stirring area;

[0018] Where ΔP osc is the pressure fluctuation amplitude; P(t) is the instantaneous pressure at any time point t; P mean(t is the average pressure of the area corresponding to time t; T is the total measurement time.

[0019] In a preferred embodiment, the surface tension temperature gradient is calculated based on the temperature data information; the liquid evaporation rate is calculated based on the temperature data information;

[0020]

[0021] in is the surface tension temperature gradient; σ1, σ2 are the surface tension values ​​at T1, T2; T1, T2 are the temperature values ​​under different working conditions; d is the differential symbol; T is the temperature variable; σ is the surface tension;

[0022] Where E r is the liquid evaporation rate; A is the area of ​​the evaporation surface; is the rate of change of liquid mass; ρ l is the liquid density; is the rate of change of liquid level.

[0023] In a preferred embodiment, the critical conditions are determined by preliminary screening, and the bubble generation rate v is collected. bubble and liquid property change value ΔP fluid , and its determination formula is:

[0024]

[0025] Among them C crit The result of the preliminary screening conditions; bubble,th is the preset bubble generation rate threshold; ΔP fluid,th is the preset threshold value of liquid property change; Δη is the change value of liquid viscosity; Δσ is the change value of liquid surface tension; ΔT is the change value of liquid temperature;

[0026] Construct a bubble life cycle model;

[0027]

[0028] in is the bubble life cycle value; t0 is the initial time of bubble generation; t f is the end time of bubble burst; is the gradient of bubble nucleation diameter with spatial position; D s is the interface diffusion gradient, which describes the diffusion rate of the substance on the bubble surface; is the time rate of change of the foam layer thickness; v aggr is the bubble aggregation rate, which describes the rate at which bubbles aggregate to form large bubbles; represents the interaction term between bubble nucleation diameter gradient and polymerization rate; α1, α2, β1, β2, γ are weight coefficients;

[0029] for Determination formula when deviating from the preset range:

[0030]

[0031] Among them C life It is the result of life cycle abnormality determination; is the reference bubble life cycle value; is the life cycle deviation threshold.

[0032] In a preferred embodiment, the temperature-stirring coupling effect is verified; when C life =1, the temperature-stirring coupling verification formula is:

[0033]

[0034] where F temp-stir is the temperature-agitation coupling sensitivity factor; is the surface tension temperature gradient; is the eddy shear rate; ΔP osc is the pressure fluctuation amplitude;

[0035] The nonlinear influence is determined as:

[0036]

[0037] Among them C nonlinear is the result of nonlinear influence determination; F th is the nonlinear sensitivity threshold;

[0038] When C nonlinear =1, enter the performance evaluation stage, pass F temp-stir Adjust parameters;

[0039]

[0040] in is the comprehensive performance evaluation value; E r is the liquid evaporation rate; Represents the change of bubble generation rate with time; Tt is the upper limit of time integral.

[0041] Technical effects and advantages of the present invention:

[0042] 1. Collect the stirring data and temperature data of the liquid through real-time sensors to monitor and analyze the working conditions, which is conducive to identifying the abnormal conditions beforehand and avoiding the misjudgment caused by monitoring lag or single parameters in traditional methods;

[0043] 2. A preliminary screening mechanism based on the bubble generation rate and the change in liquid physical properties can quickly determine abnormal operating conditions and identify problems with bubble generation and defoamer decomposition by setting multi-parameter critical thresholds;

[0044] 3. Through imaging and fluid monitoring technology, a life cycle model of bubbles from generation to rupture is established, and the relationship between bubble behavior and defoamer performance is revealed by combining the dynamic characteristics of micro and macro scales;

[0045] 4. By introducing the temperature-agitation coupling sensitivity factor, the changes in temperature gradient and shear rate are controlled to verify the adaptability and sensitivity of the defoamer under complex synergistic conditions; in particular, the determination design of nonlinear effects provides a new solution for revealing the performance dynamics of the defoamer under extreme conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Refer to the instruction manual Figure 1 , a method for monitoring the performance of a defoaming agent for liquid industrial production according to an embodiment of the present invention comprises:

[0049] The stirring data information and temperature data information of the liquid in the industrial production process are obtained in real time through sensors, and precondition one is generated based on the stirring data information, and precondition two is generated based on the temperature data information; if precondition one or precondition two is judged to be abnormal, a preliminary screening is performed;

[0050] During the preliminary screening, the bubble generation rate and the liquid property change value are collected; when the bubble generation rate is greater than the preset bubble generation rate threshold, and the liquid property change value exceeds the preset liquid property change threshold, the bubble generation rate and the liquid property change value at this time are determined to be the critical conditions determined by the preliminary screening;

[0051] Based on the critical conditions determined in the preliminary screening, the entire life cycle of microbubbles from generation to aggregation and rupture was observed using imaging and fluid monitoring, and a bubble life cycle model was established based on scales 1 and 2.

[0052] Scale 1 includes bubble nucleation diameter and interface diffusion gradient; Scale 2 includes foam thickness and bubble aggregation rate;

[0053] The bubble life cycle value is calculated based on the bubble life cycle model. If the bubble life cycle value deviates from the preset bubble life cycle threshold range, it is determined that the bubble rupture rate is reduced or the interface characteristics are disordered, and the temperature-agitation coupling effect is introduced. The sensitivity of the defoaming agent to the synergistic conditions is verified by controlling the temperature gradient and shear rate changes. When the temperature-agitation coupling effect has a nonlinear effect on the bubble behavior, the performance evaluation stage is entered.

[0054] The stirring data information includes eddy shear rate and pressure fluctuation amplitude; the eddy shear rate characterizes the shear force intensity caused by eddy current during the stirring process of the liquid, which affects the generation rate and size distribution of bubbles and is used to measure the parameters of bubble generation conditions; the pressure fluctuation amplitude characterizes the bubble nucleation and growth caused by uneven pressure distribution during the stirring of the liquid, and the size of the pressure fluctuation amplitude can be used as a pre-judgment basis for the dynamic evolution of bubble behavior;

[0055] Temperature data information includes surface tension temperature gradient and liquid evaporation rate. The surface tension temperature gradient characterizes the rate of change of liquid surface tension at the peak temperature, which affects the stability of bubbles and the diffusion efficiency of the defoaming agent, and is a parameter used to judge interface characteristics. The liquid evaporation rate characterizes the aggregation and surface shrinkage effects of bubbles caused by it.

[0056] The first precondition includes: if the eddy current shear rate is greater than a preset eddy current shear rate threshold, and the pressure fluctuation amplitude is greater than a preset pressure fluctuation amplitude threshold, it is determined to be abnormal;

[0057] Precondition 2 includes: if the surface tension temperature gradient is greater than a preset surface tension temperature gradient threshold, and the liquid evaporation rate is greater than a preset liquid evaporation rate threshold, it is determined to be abnormal.

[0058] Calculate the eddy current shear rate based on the stirring data information; calculate the pressure fluctuation amplitude based on the stirring data information;

[0059]

[0060]

[0061] in is the eddy shear rate; u and v represent the velocity components of the liquid in the x-axis and y-axis directions respectively; It is used to describe the rate of change of velocity u when the position of the liquid changes in the y-axis direction. It characterizes the velocity gradient between liquid layers and reflects the degree of local shear deformation. It is used to describe the rate of change of velocity v when the position of the liquid changes in the x-axis direction, and is used to characterize the velocity gradient of the liquid layer in another orthogonal direction, further supplementing the distribution characteristics of the local shear force; V is the volume of the stirring area; Obtained by integrating the velocity distribution gradient of the liquid, it is used to measure the effect of shear strength on the bubble generation rate;

[0062] Where ΔP osc is the pressure fluctuation amplitude; P(t) is the instantaneous pressure at any time point t; P mean (t is the average pressure of the area corresponding to time t; T is the total measurement time; ΔP osc The fluctuation amplitude is defined by the sum of the squares of the instantaneous pressure deviation from the mean pressure, which describes the effect of the dynamic behavior of liquid pressure under stirring conditions on bubble nucleation.

[0063] Calculate the surface tension temperature gradient based on the temperature data information; calculate the liquid evaporation rate based on the temperature data information;

[0064]

[0065] in is the surface tension temperature gradient; σ1, σ2 are the surface tension values ​​at T1, T2; T1, T2 are the temperature values ​​under different working conditions; d is the differential symbol; T is the temperature variable; σ is the surface tension; By fitting the experimental data, the surface tension under two sets of temperature conditions was measured, and the influence rate of temperature change was deduced;

[0066] Where E r is the liquid evaporation rate; A is the area of ​​the evaporation surface; is the rate of change of liquid mass; ρ l is the liquid density; is the rate of change of liquid level; E r Defined by the evaporation mass change per unit area and density, it is used to measure the bubble aggregation effect caused by evaporation.

[0067] Determine the critical conditions through preliminary screening and collect the bubble generation rate v bubble and liquid property change value ΔP fluid , and its determination formula is:

[0068]

[0069] Among them C crit is the result of the preliminary screening condition determination, 1 means the critical condition is met, and 0 means the critical condition is not met; v bubble,th is the preset bubble generation rate threshold; ΔP fluid,this the preset threshold value of liquid property change; Δη is the change value of liquid viscosity; Δσ is the change value of liquid surface tension; ΔT is the change value of liquid temperature;

[0070] Construct a bubble life cycle model;

[0071]

[0072] in is the bubble life cycle value, which represents the comprehensive evolution from bubble generation to burst; t0 is the initial time of bubble generation; t f is the end time of bubble burst;

[0073] The scale-one contribution is based on microscopic properties; is the gradient of bubble nucleation diameter with spatial position, Used to indicate the local inhomogeneity of bubble generation; D s is the interface diffusion gradient, describing the diffusion rate of the substance on the bubble surface, D s Used to reflect the transfer efficiency of bubble interface substances;

[0074] The scale-2 contribution is based on macroscopic properties; is the time rate of change of the foam layer thickness; v aggr is the bubble aggregation rate, which describes the rate at which bubbles aggregate to form large bubbles;

[0075] In the interaction term between scale 1 and scale 2, represents the interaction term between the bubble nucleation diameter gradient and the polymerization rate, which describes the influence of the microscopic nucleation process on the macroscopic polymerization behavior; α1, α2, β1, β2, γ are weight coefficients, γ is used to adjust the interaction strength between microscopic and macroscopic parameters, α1, α2 are microscopic characteristics The weights of β1 and β2 determine their contribution to the bubble life cycle, and β1 and β2 are macroscopic characteristics. The weight of the bubble reflects the impact of bubble dynamics on the life cycle;

[0076] for Determination formula when deviating from the preset range:

[0077]

[0078] Among them C life The result of life cycle abnormality judgment, 1 means abnormality, 0 means normal; is the reference bubble life cycle value; is the life cycle deviation threshold.

[0079] Verification of the temperature-stirring coupling effect; when C life=1, the temperature-stirring coupling verification formula is:

[0080]

[0081] where F temp-stir is the temperature-agitation coupling sensitivity factor, which indicates the sensitivity of bubble behavior to temperature and agitation conditions; is the surface tension temperature gradient; is the eddy shear rate; ΔP osc is the pressure fluctuation amplitude;

[0082] The nonlinear influence is determined as:

[0083]

[0084] Among them C nonlinear is the result of nonlinear influence determination; F th is the nonlinear sensitivity threshold; It is the second-order derivative of the coupling sensitivity factor with respect to temperature, reflecting the nonlinear influence of temperature on the coupling factor;

[0085] When C nonlinear =1, enter the performance evaluation stage, pass F temp-stir Adjust parameters;

[0086]

[0087] in is the comprehensive performance evaluation value; E r is the liquid evaporation rate; Indicates the change of bubble generation rate over time; Tt is the upper limit of time integral, indicating the time period of evaluation.

[0088] It should be noted that the above scheme aims at the bubble generation and defoamer decomposition caused by high-speed stirring and high temperature conditions in the liquid production environment, and establishes a complete monitoring process based on data collection, critical condition screening, model construction and dynamic evaluation; the following is the gradual formation process and implementation logic of the scheme:

[0089] Real-time data collection and precondition determination: The sensors collect stirring data (such as eddy shear rate and pressure fluctuation amplitude) and temperature data (such as surface tension temperature gradient and liquid evaporation rate) in real time. The eddy shear rate reflects the shear strength caused by the change in velocity gradient during stirring, and the pressure fluctuation amplitude describes the bubble nucleation caused by the local pressure unevenness in the fluid. The surface tension temperature gradient quantifies the dynamic effect of temperature on the liquid interface characteristics, and the liquid evaporation rate evaluates the strength of bubble aggregation and interface contraction effects. These parameters constitute precondition one and precondition two, respectively. When any precondition is abnormal and exceeds the set threshold, it indicates that the system may have the risk of reduced defoaming efficiency or abnormal bubble behavior.

[0090] Critical condition screening and preliminary monitoring: After the abnormal condition is triggered, the bubble generation rate and the change value of the liquid physical property, such as the change of viscosity, surface tension and temperature, are collected; by judging whether the bubble generation rate exceeds the preset threshold and whether the change value of the liquid physical property reaches the unstable critical point of the system, the critical conditions under abnormal working conditions are determined;

[0091] Establishment of a bubble life cycle model: Using imaging and fluid monitoring equipment, the entire process of bubble generation, aggregation, and rupture is tracked; the model combines microscale and macroscale, using dynamic equations to describe the evolutionary behavior of the bubble life cycle, i.e., scale one and scale two; it not only reveals the influence of microscopic interface effects on macroscopic foam behavior, but also quantifies the interactive relationship between bubble generation and rupture rate, forming a comprehensive evaluation of the action mechanism of the defoamer;

[0092] Critical condition deviation and coupling effect verification: If the calculated value of the bubble life cycle model deviates from the preset range, the coupling analysis of temperature and stirring conditions is further introduced; by controlling the changes in temperature gradient and shear rate, the adaptability and sensitivity of the defoamer to complex working conditions are verified; in particular, through nonlinear judgment, the acceleration or deceleration of the coupling effect on the bubble generation rate and rupture rate is analyzed to reveal the actual performance of the defoamer under synergistic effect;

[0093] Performance evaluation and dynamic optimization: A performance evaluation index system is established based on the dynamic changes of the comprehensive bubble generation rate, liquid evaporation rate and temperature-agitation coupling sensitive factors; through feedback regulation, the defoamer addition amount and operating parameters are dynamically adjusted to achieve real-time optimization of the production process.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for monitoring the performance of a defoamer used in liquid industrial production, characterized in that: include: The stirring data information and temperature data information of the liquid in the industrial production process are obtained in real time through sensors, and the precondition one is generated based on the stirring data information, and the precondition two is generated based on the temperature data information; If precondition 1 or precondition 2 is judged to be abnormal, a preliminary screening is performed; During the preliminary screening, the bubble generation rate and the change value of the liquid physical properties were collected; When the bubble generation rate is greater than a preset bubble generation rate threshold, and the liquid property change value exceeds a preset liquid property change threshold, the bubble generation rate and the liquid property change value at this time are determined to be critical conditions determined by preliminary screening; Based on the critical conditions determined in the preliminary screening, the entire life cycle of microbubbles from generation to aggregation and rupture was observed using imaging and fluid monitoring, and a bubble life cycle model was established based on scales 1 and 2. Scale 1 includes bubble nucleation diameter and interface diffusion gradient; Scale 2 includes foam thickness and bubble aggregation rate; The bubble life cycle value is calculated based on the bubble life cycle model. If the bubble life cycle value deviates from the preset bubble life cycle threshold range, it is determined that the bubble rupture rate is reduced or the interface characteristics are disordered, and the temperature-agitation coupling effect is introduced. The sensitivity of the defoaming agent to the synergistic conditions is verified by controlling the temperature gradient and shear rate changes. When the temperature-agitation coupling effect has a nonlinear effect on the bubble behavior, the performance evaluation stage is entered.

2. The method for monitoring the performance of a defoamer for liquid industrial production according to claim 1, characterized in that: The stirring data information includes eddy shear rate and pressure fluctuation amplitude; the eddy shear rate is used to characterize the shear force intensity caused by eddy current during the stirring process of the liquid; the pressure fluctuation amplitude is used to characterize the bubble nucleation and growth caused by the uneven pressure distribution during the stirring of the liquid; Temperature data information includes surface tension temperature gradient and liquid evaporation rate; the surface tension temperature gradient characterizes the rate of change of liquid surface tension at the peak temperature, which affects the stability of bubbles and the diffusion efficiency of defoamers; The evaporation rate of the liquid is used to characterize the aggregation and surface shrinkage effects of bubbles caused by the liquid.

3. A method for monitoring the performance of a defoamer for liquid industrial production according to claim 2, characterized in that: The first precondition includes: if the eddy current shear rate is greater than a preset eddy current shear rate threshold, and the pressure fluctuation amplitude is greater than a preset pressure fluctuation amplitude threshold, it is determined to be abnormal; Precondition 2 includes: if the surface tension temperature gradient is greater than a preset surface tension temperature gradient threshold, and the liquid evaporation rate is greater than a preset liquid evaporation rate threshold, it is determined to be abnormal.

4. The method for monitoring the performance of a defoamer for liquid industrial production according to claim 3, characterized in that: Calculate the eddy current shear rate based on the stirring data information; calculate the pressure fluctuation amplitude based on the stirring data information; in is the eddy shear rate; u and v represent the velocity components of the liquid in the x-axis and y-axis directions respectively; Used to describe the rate of change of velocity u when the position of the liquid changes in the y-axis direction; It is used to describe the rate of change of velocity v when the position of the liquid changes in the x-axis direction; V is the volume of the stirring area; Where ΔP osc is the pressure fluctuation amplitude; P(t) is the instantaneous pressure at any time point t; P mean (t is the average pressure of the area corresponding to time t; T is the total measurement time.

5. The method for monitoring the performance of a defoamer for liquid industrial production according to claim 4, characterized in that: Calculate the surface tension temperature gradient based on the temperature data information; calculate the liquid evaporation rate based on the temperature data information; in is the surface tension temperature gradient; σ1, σ2 are the surface tension values ​​at T1, T2; T1, T2 are the temperature values ​​under different working conditions; d is the differential symbol; T is the temperature variable; σ is the surface tension; Where E r is the evaporation rate of the liquid; A is the area of ​​the evaporation surface; is the rate of change of liquid mass; ρ l is the liquid density; is the rate of change of liquid level.

6. The method for monitoring the performance of a defoamer for liquid industrial production according to claim 5, characterized in that: Determine the critical conditions through preliminary screening and collect the bubble generation rate v bubble and liquid property change value ΔP fluid , and its determination formula is: Among them C crit The result of the preliminary screening conditions; bubble,th is the preset bubble generation rate threshold; ΔP fluid,th is the preset threshold value of liquid property change; Δη is the change value of liquid viscosity; Δσ is the change value of liquid surface tension; ΔT is the change value of liquid temperature; Construct a bubble life cycle model; in is the bubble life cycle value; t0 is the initial time of bubble generation; t f is the end time of bubble burst; is the gradient of bubble nucleation diameter with spatial position; D s is the interface diffusion gradient, which describes the diffusion rate of the substance on the bubble surface; is the time rate of change of the foam layer thickness; v aggr is the bubble aggregation rate, which describes the rate at which bubbles aggregate to form large bubbles; represents the interaction term between bubble nucleation diameter gradient and polymerization rate; α1, α2, β1, β2, γ are weight coefficients; for Determination formula when deviating from the preset range: Among them C life It is the result of life cycle abnormality determination; is the reference bubble life cycle value; is the life cycle deviation threshold.

7. The method for monitoring the performance of a defoaming agent for liquid industrial production according to claim 6, characterized in that: Verification of the temperature-stirring coupling effect; when C life =1, the temperature-stirring coupling verification formula is: where F temp-stir is the temperature-agitation coupling sensitivity factor; is the surface tension temperature gradient; is the eddy shear rate; ΔP osc is the pressure fluctuation amplitude; The nonlinear influence is determined as: Among them C nonlinear is the result of nonlinear influence determination; F th is the nonlinear sensitivity threshold; When C nonlinear =1, enter the performance evaluation stage, pass F temp-stir Adjust parameters; in is the comprehensive performance evaluation value; E r is the liquid evaporation rate; Represents the change of bubble generation rate over time; Tt is the upper limit of time integral.

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