Galvanizing defoaming machine water flow control method and system based on liquid level monitoring

Abstract

The invention relates to the technical field of liquid level monitoring, in particular to a galvanizing defoaming machine water flow control method and system based on liquid level monitoring, and the method comprises the steps: obtaining the foam liquid level height of each position of a to-be-galvanized steel strip cleaning section, and determining the foam gathering abnormal degree of each position in the cleaning section at each moment, according to the method, foam liquid level balance at each position of a cleaning section is constructed, a defoaming characteristic factor is obtained in combination with a foam aggregation abnormal degree, defoaming non-uniformity at each position of the cleaning section is constructed, and defoaming rate consistency at each position of the cleaning section is obtained based on a difference degree of foam liquid level change rates at each position of the cleaning section. And then the defoaming adjustment factor of the cleaning section in the time interval is obtained, the water flow of the next time interval is obtained by combining the defoaming adjustment factor of the current time interval, the water flow of the galvanizing defoaming machine and the foam liquid level height of each position, and the water flow of the galvanizing defoaming machine is adjusted. The precision of water flow control of the galvanization defoaming machine can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of liquid level monitoring, and in particular to a water flow control method and system for a galvanizing defoaming machine based on liquid level monitoring. Background Art

[0002] The surface of the steel strip to be galvanized carries a large amount of iron powder, oil, emulsion and impurities. The cleaning of the steel strip during galvanizing is an important process section of the continuous hot-dip galvanizing group, and the main cleaning media of the cleaning section are alkali solution, activator and defoamer. In the process of using the cleaning medium to clean the steel strip, the amount of foam generated by the cleaning medium will gradually increase with the length of the cleaning time, making the alkali solution foam and alkali vapor overflow more and more serious, which not only causes a large amount of alkali solution waste and increases costs, but also accelerates the corrosion and aging of equipment and plant buildings.

[0003] Compressed air is used to atomize the liquid and spray it on the foam wall, so that the tension on the foam surface is unbalanced and broken, so as to achieve the purpose of film breaking and defoaming. The defoaming method using air and water atomization spray technology can not only effectively defoam, but also reduce the overflow and waste of alkali solution, reduce the evaporation of alkali vapor, and weaken the corrosion of equipment. However, the existing technology is difficult to accurately monitor the liquid level at various positions in the cleaning section, and cannot accurately evaluate the defoaming effect of air and water atomization spray at various positions in the cleaning section, and thus cannot provide data auxiliary support for the water flow control of the galvanizing defoaming machine, which may cause the disadvantages of incomplete defoaming, resulting in the overflow and waste of alkali solution and excessive evaporation of alkali vapor. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of this application is to provide a water flow control method and system for a galvanizing defoaming machine based on liquid level monitoring. The technical solutions adopted are as follows: The present application embodiment provides a method for controlling water flow of a galvanizing defoaming machine based on liquid level monitoring, comprising the following steps: Obtain the foam liquid level height at each position of the galvanized steel strip cleaning section at each moment in each time interval; For each time interval, analyze the change of foam level height at each position in the cleaning section within the time interval, as well as the degree of difference of foam level height at each position at each moment in the time interval, and determine the degree of abnormal foam aggregation at each position in the cleaning section at each moment; The foam level balance of each position in the cleaning section within the time interval is constructed by the difference between the foam level height at each position in the cleaning section within the time interval and the predicted value of the foam level height, as well as the overall deviation of the level height difference at each moment, and the defoaming characteristic factor of each position in the cleaning section within the time interval is obtained in combination with the abnormal degree of foam aggregation; Analyze the difference degree of defoaming characteristic factors between each position of the cleaning section and other positions within the time interval, as well as the distance relationship between each position and other positions, obtain the defoaming non-uniformity of each position of the cleaning section within the time interval, and obtain the defoaming rate consistency of each position of the cleaning section within the time interval based on the difference degree of foam level change rate at each position of the cleaning section within the time interval, and obtain the defoaming adjustment factor of the cleaning section within the time interval by combining the defoaming non-uniformity and defoaming rate consistency of all positions of the cleaning section within the time interval; According to the defoaming adjustment factor of the current time interval, the water flow of the galvanizing defoaming machine and the foam level height at each position, a neural network is used to obtain the water flow of the galvanizing defoaming machine in the next time interval to adjust the water flow of the galvanizing defoaming machine; The expression for the abnormal degree of foam aggregation at each position in the cleaning section at each time is: ; In the formula, is the abnormal degree of foam aggregation at the i-th position in the cleaning section at the j-th moment; is the slope of the foam level height at the jth moment at the ith position in the cleaning section, wherein the foam level heights at all moments in the time interval at each position constitute a foam level height sequence at each position, and the foam level height sequence is fitted to obtain the slope of the foam level height at each position at each moment; is the deviation value of the i-th position in the cleaning section at the j-th moment, where the deviation value is the difference between the foam level height at each moment and the previous moment; is the average value of the deviation value of the i-th position in the cleaning section at all times in the time interval; exp() is an exponential function with a natural constant as the base; The expression of the foam level balance at each position of the cleaning section within the time interval is: ; In the formula, is the foam level balance at the i-th position of the cleaning section within the time interval; is the total number of moments in the time interval; It is the cumulative result of the difference between the absolute value of the deviation value of the i-th position in the cleaning section at the j-th moment and at all other moments in the time interval; is the absolute value of the difference between the foam level height at the jth moment in the i-th position of the cleaning section within the time interval and the predicted value of the foam level height; To avoid constants with zero denominators; The expression of the defoaming characteristic factor at each position of the cleaning section within the time interval is: ; In the formula, is the defoaming characteristic factor of the i-th position in the cleaning section within the time interval; is the foam level balance at the i-th position of the cleaning section within the time interval; is the abnormal degree of foam aggregation at the i-th position in the cleaning section at the j-th moment; is the total number of moments in the time interval; norm() is the normalization function; The expression of defoaming non-uniformity at each position of the cleaning section within the time interval is: ; In the formula, is the defoaming non-uniformity at the i-th position of the cleaning section within the time interval; It is the cumulative result of the absolute value of the difference between the i-th position of the cleaning section and all other positions in the time interval regarding the defoaming characteristic factor; is the cumulative result of the Euclidean distance between the i-th position and all other positions in the cleaning segment; To avoid constants with zero denominators.

[0005] Preferably, the foam liquid level height prediction value further includes: taking the foam liquid level height sequence at each position of the cleaning section within a time interval as an input of a prediction algorithm to obtain the foam liquid level height prediction value at each position in the cleaning section at each moment within the next time interval.

[0006] Preferably, the expression for the consistency of the defoaming rate at each position of the cleaning section within the time interval is: ;in, is the consistency of defoaming rate at the i-th position of the cleaning section within the time interval; is the total number of positions preset in the cleaning section; is the total number of moments in the time interval; , They are respectively the foam level change rates at the i-th and g-th positions in the cleaning section at the k-th moment within the time interval, which are calculated and obtained by the time interval between each position at each moment and its previous moment and the difference in foam level height.

[0007] Preferably, the foam level change rate further includes: The time interval between each moment in the time interval and its previous moment is counted, and the absolute value of the difference in foam level height between each moment in the time interval and its previous moment is calculated, and then the ratio with the time interval is used as the foam level change rate at each moment.

[0008] Preferably, the defoaming adjustment factor of the cleaning section within the time interval is: calculating the cumulative value of the ratio of the defoaming non-uniformity to the defoaming rate consistency at all positions of the cleaning section within the time interval, and taking the normalized result of the cumulative value as the defoaming adjustment factor.

[0009] An embodiment of the present application also provides a water flow control system for a galvanizing defoaming machine based on liquid level monitoring, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of any one of the above methods when executing the computer program.

[0010] From the above, it can be seen that the water flow control method and system of the galvanizing defoaming machine based on liquid level monitoring provided by the present application have at least the following beneficial effects: The present application obtains the defoaming characteristic factor through the foam aggregation characteristics and foam level stability characteristics at each position in the cleaning section within the time interval, comprehensively analyzes the abnormal degree of foam aggregation and the balance of foam level rise at each position in the cleaning section within the time interval, and accurately reflects the degree to which the foam at each position in the cleaning section within the time interval is effectively decomposed under the action of water mist particles; obtains the defoaming adjustment factor according to the defoaming unevenness characteristics and defoaming rate characteristics at each position in the cleaning section within the time interval, evaluates the alkali solution foam overflow and alkali vapor volatilization conditions, and adjusts the water flow rate of the galvanizing defoamer based on this, and adds an analysis of the uneven foam level height at each position in the cleaning section on the basis of considering the time series changes in the foam level height due to the low water mist particle flow rate, accurately reflects the overall uneven foam decomposition condition of the cleaning section within the time interval, and avoids the problem that the water flow rate of the galvanizing defoamer is too low, which makes it impossible to effectively decompose the foam, resulting in alkali solution foam overflow and serious alkali vapor volatilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 A flow chart of the steps of the water flow control method of a galvanizing defoaming machine based on liquid level monitoring provided in this application. DETAILED DESCRIPTION

[0013] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the water flow control method and system of the galvanizing defoaming machine based on liquid level monitoring proposed in the present application, its specific implementation method, structure, features and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0014] Unless otherwise specified and limited, terms such as "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such articles or devices. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the article or device including the element. In addition, the term "and\or" used herein includes any and all combinations of one or more related listed items. All technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application.

[0015] The specific scheme of the water flow control method and system of the galvanizing defoaming machine based on liquid level monitoring provided by the present application is described in detail below with reference to the accompanying drawings.

[0016] See also Figure 1 , which shows a flow chart of the steps of a method for controlling water flow of a galvanizing defoaming machine based on liquid level monitoring provided by an embodiment of the present application, comprising the following steps: Step 1: Obtain the foam liquid level height at each position of the cleaning section of the galvanized steel strip at each moment in each time interval.

[0017] Firstly, the foam liquid level height data at each position of the galvanized steel strip cleaning section is collected. In this embodiment, the Multi-Sensor FL5400 foam liquid level sensor is used to measure the foam liquid level height at each preset position of the cleaning section, wherein the foam liquid level height is the sum of the actual liquid surface height and the foam layer height. The data collection time interval is 0.5s. In this embodiment, the number of preset positions for collecting the foam liquid level height on the cleaning section is 20.

[0018] Furthermore, in this embodiment, in order to prevent the foam liquid level height data acquired by the sensor from being missing due to transmission fluctuations or interference from the external environment, which may affect subsequent analysis, the median filling method is used to fill the foam liquid level height at each position of the cleaning section. Among them, the median filling method is a well-known technology, and the specific acquisition process will not be described in detail.

[0019] At this point, the foam liquid level height data at each position of the cleaning section can be obtained through the above method.

[0020] Step 2: For each time interval, analyze the change in the foam level height at each position in the cleaning section within the time interval, as well as the degree of difference in the foam level height at each position at each moment in the time interval, to determine the degree of abnormal foam aggregation at each position in the cleaning section at each moment.

[0021] During the cleaning process of the galvanized steel strip, the cleaning medium will produce foam under the effects of wetting penetration, emulsification, dispersion and foaming. The air and water atomization spray technology destroys the surface tension of the foam by spraying fine water mist particles to achieve the purpose of eliminating the foam; during the defoaming process, the foam level will slowly rise with the spraying of water mist particles. The greater the rising trend of the foam level and the more significant the abnormal peak, it means that the foam in the cleaning section has not been effectively decomposed in the current time interval, the more serious the situation of large-scale foam accumulation is, and the worse the defoaming treatment effect is.

[0022] Based on the above analysis, in this embodiment, every 20 minutes is divided into a time interval, and any position in any time interval is taken as an example for analysis, and the foam level heights of each position at all times in the time interval are used to form a foam level height sequence for each position. Further, in this embodiment, the foam level height sequence corresponding to each position in the cleaning section is used as input, and the least squares method is used to obtain the fitting curve of the foam level height sequence at each position in the cleaning section. The slope of the foam level height at any position in the cleaning section at each moment is obtained according to the fitting curve, which can reflect the condition of the short-term increase of the foam level height at each moment, but cannot eliminate the upward trend of the foam level height itself in the time interval, resulting in a large slope of the foam level height data itself, which affects the subsequent analysis. Since the least squares method is a well-known technology, the specific acquisition process will not be repeated.

[0023] Furthermore, the difference between the foam liquid level height at each position of the cleaning section at each moment and the previous moment is taken as the deviation value of each position of the cleaning section at each moment. In this embodiment, the difference between the foam liquid level heights at two moments is evaluated by taking the absolute value of the difference between the foam liquid level heights at the two moments. Specifically, for each position, the absolute value of the difference between the foam liquid level heights at the jth moment and the j-1th moment is taken as the deviation value at the jth moment, wherein, when j is 1, the absolute value of the difference between the foam liquid level heights at the first moment and the second moment is taken as the deviation value at the first moment.

[0024] Further, according to the slope and deviation value of the foam level height at each position in the cleaning section at each moment, the abnormal degree of foam aggregation at each position in the cleaning section at each moment is calculated. For the abnormal degree of foam aggregation at any position in the cleaning section at each moment, in this embodiment, the specific calculation formula is: ; In the formula, is the abnormal degree of foam aggregation at the jth moment at the ith position in the cleaning section; is the slope of the foam level height at the jth moment at the ith position in the cleaning section; is the deviation value of the i-th position in the cleaning section at the j-th moment; is the average value of the deviation value of the i-th position in the cleaning section at all times in the time interval; exp() is an exponential function with a natural constant as the base.

[0025] When the foam is not effectively decomposed and the foam accumulates rapidly during the defoaming treatment of the cleaning section, the more obvious the situation is that the foam level increases in a short period of time, the larger the abnormal peak value of the foam level height, and the stronger the abnormal degree of foam aggregation. That is, the larger the slope of the foam level height data corresponding to any moment, the larger the deviation value at any moment at the cleaning section position relative to the average value of the deviation values ​​of all other moments in the time interval.

[0026] Step three: construct the foam level balance of each position in the cleaning section within the time interval through the difference between the foam level height at each position in the cleaning section within the time interval and the predicted value of the foam level height, as well as the overall deviation of the level height difference at each moment, and obtain the defoaming characteristic factor of each position in the cleaning section within the time interval in combination with the abnormal degree of foam aggregation.

[0027] In the process of defoaming by air and water atomization spraying technology in the cleaning section, when the defoaming effect of the cleaning section is good, the generation and elimination of foam in the cleaning section will reach a relatively balanced state, and the foam level height will be more stable in the process of slowly rising with the spraying of water mist particles. Since the foam aggregation has not been effectively decomposed, the drastic fluctuation of the foam liquid level height is not obvious.

[0028] Based on the above analysis, the foam level height sequence corresponding to each position in the cleaning section within the time interval is used as the input of the EMA (Exponential Moving Average) exponential moving average data prediction algorithm to obtain the foam level height prediction value at any moment in each position in the cleaning section within the next time interval. Among them, the EMA exponential moving average data prediction algorithm is a well-known technology, and the specific process will not be described in detail.

[0029] Furthermore, according to the difference between the foam level height at each position of the cleaning section in the time interval at each moment and the predicted value of the foam level height, as well as the difference in the deviation value at different moments, the foam level balance at each position of the cleaning section in the time interval is constructed. For the foam level balance at any position in the cleaning section in the time interval, the specific expression is: ; In the formula, is the foam level balance at the i-th position of the cleaning section within the time interval; is the total number of moments in the time interval; It is the cumulative result of the difference between the absolute value of the deviation value of the i-th position in the cleaning section at the j-th moment and at all other moments in the time interval; is the absolute value of the difference between the foam level height at the jth moment in the i-th position of the cleaning section within the time interval and the predicted value of the foam level height; To avoid a constant with a denominator of zero, the value range is 0 to 1. In this embodiment, the value is 0.1 to prevent the denominator from being zero.

[0030] When the defoaming treatment effect of the cleaning section is better, the generation and elimination of foam at various positions in the cleaning section tend to a relatively balanced state, the foam level heights that rise or fall at various positions in the cleaning section at each moment are closer, the situation in which the foam level height fluctuates violently due to the foam not being effectively decomposed is milder, and the foam level balance is stronger, that is, the changes in the foam level height at various positions in the cleaning section at each moment are closer, and the difference between the foam level height data at various positions in the cleaning section at each moment within the time interval and the predicted value of the foam level height is smaller.

[0031] Generally speaking, the stronger the abnormality of foam aggregation at each position within the time interval and the weaker the balance of the foam level, the more obvious the phenomenon of rapid aggregation of foam without being effectively decomposed by water mist during the defoaming treatment in the cleaning section, and the more difficult it is for the generation and elimination of foam to reach a relatively balanced state. At this time, it is more necessary to control the water flow of the galvanizing defoaming machine to enhance the destructive effect of water mist particles on the surface tension of the foam, and to avoid the overflow of alkali solution foam and excessive volatilization of alkali vapor to corrode the equipment.

[0032] Therefore, combining the foam level balance and the degree of foam aggregation abnormality at each position of the cleaning section within the time interval, the defoaming characteristic factor at each position of the cleaning section within the time interval is obtained. For the defoaming characteristic factor at any position in the cleaning section within the time interval, in this embodiment, the expression is: ; In the formula, is the defoaming characteristic factor of the i-th position in the cleaning section within the time interval; is the foam level balance at the i-th position of the cleaning section within the time interval; is the abnormal degree of foam aggregation at the i-th position in the cleaning section at the j-th moment; is the total number of moments in the time interval; norm() is the normalization function, so that The value range of is in the range of [0,1].

[0033] The more sufficient the foam elimination effect at any position of the cleaning section within the time interval, the more effectively the foam at each position of the cleaning section can be decomposed under the action of the water mist particles, the more stable the rising trend of the foam level tends to be, the milder the foam aggregation phenomenon at each position of the cleaning section, and the larger the defoaming characteristic factor, that is, the stronger the balance of the foam level at each position in the cleaning section within the time interval, and the weaker the abnormal degree of foam aggregation at each position in the cleaning section at each moment within the time interval.

[0034] At this point, the defoaming characteristic factor at each position in the cleaning section within the time interval can be obtained by the above method.

[0035] Step 4: Analyze the difference degree of defoaming characteristic factors between each position and other positions of the cleaning section within the time interval, as well as the distance relationship between each position and other positions, obtain the defoaming unevenness of each position of the cleaning section within the time interval, and based on the difference degree of foam level change rate at each position of the cleaning section within the time interval, obtain the defoaming rate consistency of each position of the cleaning section within the time interval, and combine the defoaming unevenness and defoaming rate consistency of all positions of the cleaning section within the time interval to obtain the defoaming adjustment factor of the cleaning section within the time interval.

[0036] Furthermore, this embodiment takes into account that the degree of foam elimination is evaluated only by the defoaming characteristic factors at each position in the cleaning section within the time interval, lacks consideration of the spatial heterogeneity of the defoaming treatment effect at different positions in the cleaning section, and ignores the distribution of the defoaming effect at each position in the cleaning section. At this time, adjusting the water flow rate of the galvanizing defoamer may continue to aggravate the uneven degree of foam elimination at each position in the cleaning section, which may cause overflow of alkali solution foam and excessive evaporation of alkali vapor in severe cases.

[0037] Generally speaking, the stability of foam is mainly affected by the liquid film. When the foam decomposition effect is more uneven due to the low spray volume of water mist particles during the defoaming treatment in the cleaning section, the difference in the degree of foam aggregation at various positions in the cleaning section is more obvious, the stability difference of the equilibrium state of foam generation and elimination at various positions is greater, and the distribution of areas with similar effective foam decomposition conditions is more discrete.

[0038] Based on the above analysis, the defoaming non-uniformity of each position is constructed according to the difference in defoaming characteristic factors between each position and other positions and the distance relationship between the positions. For the defoaming non-uniformity of any position in the cleaning section, the specific expression is: ; In the formula, is the defoaming non-uniformity at the i-th position of the cleaning section within the time interval; It is the cumulative result of the absolute value of the difference between the i-th position of the cleaning section and all other positions in the time interval regarding the defoaming characteristic factor; is the cumulative result of the Euclidean distance between the i-th position and all other positions in the cleaning segment; To avoid a constant with a denominator of zero, the value range is 0 to 1. In this embodiment, the value is 0.1 to prevent the denominator from being zero.

[0039] When the foam decomposition effect at each position is more uneven due to the low spray volume of water mist particles during the defoaming treatment of the cleaning section, the difference between the foam aggregation phenomena at each position of the cleaning section is more significant, the distribution of regions with large differences in the effective decomposition conditions of foam at each position of the cleaning section is more concentrated, and the defoaming unevenness is stronger, that is, the ratio of the cumulative result of the absolute value of the difference between the corresponding defoaming characteristic factors at each position in the cleaning section within the time interval to the Euclidean distance between each position is greater.

[0040] The spatial heterogeneity of the defoaming treatment effect at different positions in the cleaning section is not only reflected in the uneven degree of defoaming between different positions. When the foam removal effect at each position is more uneven due to the low water mist spraying volume during the defoaming treatment of the cleaning section, the foam generated at each position of the cleaning section is broken by the water mist particles at different rates, which makes the difference in the rate of change of the foam liquid level height at each position greater.

[0041] Based on the above analysis, the difference in the foam level change rate at each position in the cleaning section within the time interval is analyzed, and the consistency of the defoaming rate at each position in the cleaning section within the time interval is calculated. For the consistency of the defoaming rate at any position in the cleaning section within the time interval, the specific expression is: ;in, is the consistency of defoaming rate at the i-th position of the cleaning section within the time interval; is the total number of positions preset in the cleaning section; is the total number of moments in the time interval, and in this embodiment, the value is 20; , They are respectively the foam level change rates at the i-th and g-th positions in the cleaning section at the k-th moment in the time interval. The foam level change rate is obtained by the time interval between each position at each moment and the previous moment and the difference in foam level height. In this embodiment, the foam level change rate is calculated as follows: the time interval between each moment in the time interval and the previous moment is counted, and the absolute value of the difference in foam level height between each moment in the time interval and the previous moment is calculated, and the ratio of the absolute value to the time interval is used as the foam level change rate at each moment. Among them, for the first moment, in this embodiment, the absolute value of the difference in foam level height between the first moment and the next moment in the time interval is taken, and then the ratio to the time interval is taken as the foam level change rate at the first moment.

[0042] When the situation in which the foam cannot be effectively decomposed due to the low water mist spray volume during the defoaming treatment of the cleaning section becomes more serious, the foam removal effect at various positions of the cleaning section becomes more uneven, the difference in foam decomposition rate at various positions of the cleaning section becomes greater, and the consistency of the defoaming rate becomes weaker, that is, the greater the cumulative difference in the foam level change rate at different positions of the cleaning section at all times within the time interval.

[0043] When the defoaming unevenness at each position in the cleaning section within the time interval is stronger and the defoaming rate consistency is weaker, it means that the foam surface tension cannot be broken in time due to the low spraying volume of water mist particles in the cleaning section within the current time interval, making the foam decomposition effect at each position in the cleaning section more uneven, and the abnormal foam aggregation phenomenon and the imbalance of foam removal are more serious. At this time, the water flow rate of the galvanized defoamer in the cleaning section should be increased in time to enhance the destructiveness of water mist particles on the foam surface tension and improve the defoaming effect.

[0044] Therefore, the defoaming adjustment factor of the cleaning section within the time interval is obtained by combining the defoaming unevenness and the defoaming rate consistency of all positions in the cleaning section within the time interval. Specifically, in the present embodiment, the defoaming adjustment factor of the cleaning section within any time interval is calculated as follows: the cumulative value of the ratio of the defoaming unevenness to the defoaming rate consistency of all positions in the cleaning section is calculated, and the normalized result after normalization of the cumulative value is used as the defoaming adjustment factor.

[0045] When the effect of breaking the foam surface tension is poor due to the low flow rate of water mist particles during the defoaming process, the uniformity of effective foam removal at each position of the cleaning section is lower, and the consistency of the defoaming rate at each position of the cleaning section is weaker. At this time, the water flow rate of the galvanized defoamer in the cleaning section should be adjusted in time within the time interval, so as to adjust the degree of damage of the water mist particles to the foam surface tension, avoid the overflow of alkali solution foam and excessive evaporation of alkali steam. The larger the defoaming adjustment factor, that is, the greater the cumulative ratio of the defoaming unevenness to the defoaming rate consistency at each position of the cleaning section within the time interval.

[0046] At this point, the above process of this embodiment is repeated to obtain the defoaming adjustment factor of the cleaning section in any time interval.

[0047] Step 5: According to the defoaming adjustment factor of the current time interval, the water flow of the galvanizing defoaming machine and the foam level height at each position, a neural network is used to obtain the water flow of the galvanizing defoaming machine in the next time interval to adjust the water flow of the galvanizing defoaming machine.

[0048] Further, in this embodiment, a defoaming adjustment threshold value P is set. When the defoaming adjustment factor of the acquired time interval is less than the defoaming adjustment threshold value, it is considered that the current time interval is slightly incapable of effectively breaking the foam surface tension due to the low water flow of the galvanizing defoaming machine, and there is no alkali foam overflow or alkali vapor volatilization in the cleaning section. At this time, the water flow of the galvanizing defoaming machine in the current time interval is not adjusted to avoid waste of water resources or excessive defoaming; when the defoaming adjustment factor of the acquired time interval is greater than or equal to the defoaming adjustment threshold value, it is considered that the current time interval is incapable of effectively breaking the foam surface tension due to the low water flow of the galvanizing defoaming machine, and the alkali foam overflow or alkali vapor volatilization in the cleaning section is serious. It is necessary to adjust the water flow of the galvanizing defoaming machine in time to improve the destruction of the foam surface tension by water mist particles. In this embodiment, the defoaming adjustment threshold value P is 0.6. The implementer can set the defoaming adjustment threshold value according to the actual situation. The specific adjustment method of the water flow of the galvanizing defoaming machine is as follows: The defoaming adjustment factor of the current time interval, the water flow of the galvanizing defoaming machine in the current time interval and the average value of the foam level height at each position are taken as input, and the RNN convolutional neural network is used to obtain the water flow of the galvanizing defoaming machine in the next time interval. Among them, the RNN convolutional neural network uses the mean square error as the loss function and Adam as the optimization algorithm.

[0049] The water flow rate of the galvanizing defoaming machine in the next time interval and the water flow rate in the current time interval obtained above are used as the input of the PID controller. The PID controller controls the water flow rate of the galvanizing defoaming machine by calculating the error between the corresponding water flow rates in the current time interval and the next time interval. The PID controller outputs the water flow control signal of the galvanizing defoaming machine in the next time interval. Among them, the control processes of the RNN convolutional neural network and the PID controller are both well-known technologies, and the specific acquisition process will not be described in detail.

[0050] At this point, the above method can be used to evaluate the alkali solution foam overflow and alkali vapor volatilization status in the time interval cleaning section, and complete the water flow control of the galvanizing defoaming machine.

[0051] Based on the same inventive concept as the above method, an embodiment of the present application also provides a water flow control system for a galvanizing defoaming machine based on liquid level monitoring, comprising a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of any one of the above-mentioned methods for controlling water flow of a galvanizing defoaming machine based on liquid level monitoring are implemented.

[0052] It is to be understood that the sequence of the embodiments of the present application described above is for description only and does not represent the advantages and disadvantages of the embodiments. The above describes specific embodiments of the present specification. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0053] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0054] The above content is only an implementation method of the present application and is not intended to limit the scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the protection scope of the present application.

Claims

1. A water flow control method for a galvanizing defoaming machine based on liquid level monitoring, characterized in that: The following steps are involved: Obtain the foam liquid level height at each position of the galvanized steel strip cleaning section at each moment in each time interval; For each time interval, analyze the change of foam level height at each position in the cleaning section within the time interval, as well as the degree of difference of foam level height at each position at each moment in the time interval, and determine the degree of abnormal foam aggregation at each position in the cleaning section at each moment; The foam level balance of each position in the cleaning section within the time interval is constructed by the difference between the foam level height at each position in the cleaning section within the time interval and the predicted value of the foam level height, as well as the overall deviation of the level height difference at each moment, and the defoaming characteristic factor of each position in the cleaning section within the time interval is obtained in combination with the abnormal degree of foam aggregation; Analyze the difference degree of defoaming characteristic factors between each position of the cleaning section and other positions within the time interval, as well as the distance relationship between each position and other positions, obtain the defoaming non-uniformity of each position of the cleaning section within the time interval, and obtain the defoaming rate consistency of each position of the cleaning section within the time interval based on the difference degree of foam level change rate at each position of the cleaning section within the time interval, and obtain the defoaming adjustment factor of the cleaning section within the time interval by combining the defoaming non-uniformity and defoaming rate consistency of all positions of the cleaning section within the time interval; According to the defoaming adjustment factor of the current time interval, the water flow of the galvanizing defoaming machine and the foam level height at each position, a neural network is used to obtain the water flow of the galvanizing defoaming machine in the next time interval to adjust the water flow of the galvanizing defoaming machine; The expression for the abnormal degree of foam aggregation at each position in the cleaning section at each time is: ; In the formula, is the abnormal degree of foam aggregation at the i-th position in the cleaning section at the j-th moment; is the slope of the foam level height at the jth moment at the ith position in the cleaning section, wherein the foam level heights at all moments in the time interval at each position constitute a foam level height sequence at each position, and the foam level height sequence is fitted to obtain the slope of the foam level height at each position at each moment; is the deviation value of the i-th position in the cleaning section at the j-th moment, where the deviation value is the difference between the foam level height at each moment and the previous moment; is the average value of the deviation value of the i-th position in the cleaning section at all times in the time interval; exp() is an exponential function with a natural constant as the base; The expression of the foam level balance at each position of the cleaning section within the time interval is: ; In the formula, is the foam level balance at the i-th position of the cleaning section within the time interval; is the total number of moments in the time interval; It is the cumulative result of the difference between the absolute value of the deviation value of the i-th position in the cleaning section at the j-th moment and at all other moments in the time interval; is the absolute value of the difference between the foam level height at the jth moment in the i-th position of the cleaning section within the time interval and the predicted value of the foam level height; To avoid constants with zero denominators; The expression of the defoaming characteristic factor at each position of the cleaning section within the time interval is: ; In the formula, is the defoaming characteristic factor of the i-th position in the cleaning section within the time interval; is the foam level balance at the i-th position of the cleaning section within the time interval; is the abnormal degree of foam aggregation at the i-th position in the cleaning section at the j-th moment; is the total number of moments in the time interval; norm() is the normalization function; The expression of defoaming non-uniformity at each position of the cleaning section within the time interval is: ; In the formula, is the defoaming non-uniformity at the i-th position of the cleaning section within the time interval; It is the cumulative result of the absolute value of the difference between the i-th position of the cleaning section and all other positions in the time interval regarding the defoaming characteristic factor; is the cumulative result of the Euclidean distance between the i-th position and all other positions in the cleaning segment; To avoid constants with zero denominators.

2. The water flow control method of the galvanizing defoaming machine based on liquid level monitoring according to claim 1 is characterized in that: The foam liquid level height prediction value further includes: taking the foam liquid level height sequence of each position of the cleaning section within a time interval as an input of a prediction algorithm to obtain the foam liquid level height prediction value of each position in the cleaning section at each moment within the next time interval.

3. The water flow control method of the galvanizing defoaming machine based on liquid level monitoring as claimed in claim 1 is characterized in that: The expression for the consistency of the defoaming rate at each position of the cleaning section within the time interval is: ;in, is the consistency of defoaming rate at the i-th position of the cleaning section within the time interval; is the total number of positions preset in the cleaning section; is the total number of moments in the time interval; , They are respectively the foam level change rates at the i-th and g-th positions in the cleaning section at the k-th moment within the time interval, which are calculated and obtained by the time interval between each position at each moment and its previous moment and the difference in foam level height.

4. The water flow control method of the galvanizing defoaming machine based on liquid level monitoring as claimed in claim 3 is characterized in that: The foam level change rate further includes: The time interval between each moment in the time interval and its previous moment is counted, and the absolute value of the difference in foam level height between each moment in the time interval and its previous moment is calculated, and then the ratio with the time interval is used as the foam level change rate at each moment.

5. The water flow control method of the galvanizing defoaming machine based on liquid level monitoring as claimed in claim 1 is characterized in that: The defoaming adjustment factor of the cleaning section within the time interval is: the cumulative value of the ratio of the defoaming non-uniformity to the defoaming rate consistency of all positions in the cleaning section within the time interval is calculated, and the normalized result of the cumulative value is used as the defoaming adjustment factor.

6. A water flow control system for a galvanizing defoaming machine based on liquid level monitoring, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

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