Method for determining slurry discharge temperature and readable storage medium

Abstract

The present application provides a method for determining the discharge temperature of slurry and a readable storage medium. The slurry temperature-time change curve diagram and the slurry viscosity-time change curve diagram are respectively drawn through the mapping relationship between the slurry temperature and time and the mapping relationship between the slurry viscosity and time. The reference value when the temperature change rate is less than or equal to the preset rate is obtained through the slurry temperature-time change curve diagram, and the stable viscosity value is obtained through the reference value. If the stable viscosity value is in the preset viscosity range, the slurry temperature corresponding to the stable viscosity value is used as the maximum discharge temperature. In this way, the discharge timing of the slurry only needs to be determined according to the high temperature of the slurry, and the room temperature viscosity is predicted by the high temperature viscosity. The high temperature viscosity is used as the discharge standard. The waiting time for measuring the high temperature viscosity of the slurry is shorter than that for measuring the low temperature viscosity of the slurry, and the result is reliable, thereby effectively shortening the waiting time for cooling the slurry to improve the pulping capacity.

Description

Technical Field

[0001] The present application belongs to the field of battery production technology, and in particular, relates to a method for determining a slurry discharge temperature and a readable storage medium. Background Art

[0002] Lithium-ion batteries have been widely used in portable consumer electronics, electric vehicles, and energy storage. The manufacturing process of lithium-ion batteries includes pulping, mixing, sheeting, assembly, liquid injection, and formation. Among them, pulping is the first step in the production of lithium-ion batteries, and the pulping time directly affects the production capacity of lithium-ion batteries. The pulping steps are divided into feeding, stirring, cooling, and discharging. The viscosity of high-temperature slurry is low and unstable, which does not meet the requirements for discharging coating. Therefore, it is necessary to wait for the temperature of the slurry to decrease and the viscosity to increase to the discharging standard before discharging. The relevant technology is to determine whether the slurry has reached the preset viscosity by measuring the low-temperature viscosity of the slurry, but because the low-temperature viscosity is generally room temperature and the discharging temperature is low, as the discharging temperature decreases, the heat transfer driving force weakens, the cooling is slow, and the cooling time is long, even exceeding half of the stirring time, which affects the pulping capacity. Summary of the invention

[0003] The embodiments of the present application provide a method for determining the discharge temperature of pulp and a readable storage medium to solve the problem of long cooling time in the existing pulping process.

[0004] In a first aspect, an embodiment of the present application provides a method for determining a slurry discharge temperature, comprising the following steps:

[0005] Obtaining slurry temperature and slurry viscosity at multiple different times;

[0006] A slurry temperature-time variation curve is drawn according to the mapping relationship between the slurry temperature and time in each group, and a slurry viscosity-time variation curve is drawn according to the mapping relationship between the slurry viscosity and time in each group;

[0007] Obtaining a reference value when the temperature change rate is less than or equal to a preset rate according to the slurry temperature-time change curve; the reference value is a temperature value or a time point;

[0008] Based on the time point and the slurry viscosity-time variation curve graph, or based on the temperature value, the slurry viscosity-time variation curve graph and the slurry temperature-time variation curve graph, obtaining a stable viscosity value corresponding to the reference value;

[0009] Determine that the stable viscosity value is within a preset viscosity range, and use the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature.

[0010] Optionally, the step of obtaining a reference value when the temperature change rate is less than or equal to a preset rate according to the slurry temperature-time change curve diagram includes:

[0011] Obtaining a first relationship equation by fitting a slurry temperature-time variation curve diagram, wherein the first relationship equation is a relationship equation between slurry temperature and time;

[0012] The first relational expression is derived to obtain a second relational expression, wherein the second relational expression is a relational expression between the slurry temperature change rate and time;

[0013] The reference value is obtained according to the preset rate, the second relational expression and the first relational expression.

[0014] Optionally, the step of obtaining a first relationship equation by fitting a slurry temperature-time variation curve diagram, wherein the first relationship equation is a relationship equation between the slurry temperature and time, comprises:

[0015] Obtaining a first relationship by fitting the slurry temperature-time variation curve;

[0016] Obtaining a first curve fitting correlation coefficient according to the first relationship and the slurry temperature-time variation curve diagram;

[0017] Determine that the first curve fitting correlation coefficient is greater than or equal to a preset coefficient, and use the first relationship as the relationship between the slurry temperature and time.

[0018] Optionally, the step of obtaining the stable viscosity value corresponding to the reference value based on the time point and the slurry viscosity-time variation curve graph, or based on the temperature value, the slurry viscosity-time variation curve graph and the slurry temperature-time variation curve graph, comprises:

[0019] Draw a slurry viscosity-slurry temperature change curve diagram according to the slurry temperature-time change curve diagram and the slurry viscosity-time change curve diagram;

[0020] The stable viscosity value is determined according to the slurry viscosity-slurry temperature change curve and the temperature value in the reference value.

[0021] Optionally, the step of determining the stable viscosity value according to the slurry viscosity-slurry temperature change curve and the temperature value in the reference value includes:

[0022] Obtaining a third relationship equation by fitting the slurry viscosity-slurry temperature variation curve diagram, wherein the third relationship equation is a relationship equation between the slurry viscosity and the slurry temperature;

[0023] Substitute the temperature value from the reference into the third relationship to obtain the steady viscosity value.

[0024] Optionally, the step of obtaining a third relationship by fitting the slurry viscosity-slurry temperature variation curve, wherein the third relationship is a relationship between the slurry viscosity and the slurry temperature, comprises:

[0025] The third relationship is obtained by fitting the slurry viscosity-slurry temperature variation curve diagram;

[0026] Obtaining a second curve fitting correlation coefficient according to the third relationship and the slurry viscosity-slurry temperature variation curve diagram;

[0027] It is determined that the second curve fitting correlation coefficient is greater than or equal to a preset coefficient, and the third relationship is used as the relationship between the slurry viscosity and the slurry temperature.

[0028] Optionally, after the step of taking the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature, the method further comprises:

[0029] The difference between the maximum discharge temperature and the preset allowable difference is taken as the minimum discharge temperature.

[0030] Optionally, the number of the slurries is multiple groups to obtain multiple stable viscosity values; the step of determining that the stable viscosity value is in a preset viscosity range and taking the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature includes:

[0031] Determine that a plurality of stable viscosity values ​​are within a preset viscosity range, and use the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature.

[0032] Optionally, the step of obtaining the stable viscosity value corresponding to the reference value based on the time point and the slurry viscosity-time variation curve graph, or based on the temperature value, the slurry viscosity-time variation curve graph and the slurry temperature-time variation curve graph, comprises:

[0033] Substitute the time points in the reference value into the slurry viscosity-time variation curve to obtain the stable viscosity value.

[0034] In a second aspect, an embodiment of the present application further provides a readable storage medium having a control program stored thereon, and when the control program is executed by a processor, the steps of the method for determining the slurry discharge temperature as described above are implemented.

[0035] The method for determining the slurry discharge temperature provided in the embodiment of the present application is to draw a slurry temperature-time change curve diagram and a slurry viscosity-time change curve diagram respectively through the mapping relationship between the slurry temperature and time and the mapping relationship between the slurry viscosity and time, obtain a reference value when the temperature change rate is less than or equal to the preset rate through the slurry temperature-time change curve diagram, and then obtain a stable viscosity value through the reference value. If the stable viscosity value is in the preset viscosity range, the slurry temperature corresponding to the stable viscosity value is used as the maximum discharge temperature. In this way, the discharge timing of the slurry only needs to be determined according to the high temperature of the slurry, and the room temperature viscosity is predicted by the high temperature viscosity. The high temperature viscosity is used as the discharge standard. The waiting time for measuring the high temperature viscosity of the slurry is shorter than that for measuring the low temperature viscosity of the slurry, and the result is more reliable, thereby effectively shortening the waiting time for cooling the slurry to improve the pulping capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0037] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0038] Figure 1 A schematic flow chart of a method for determining the slurry discharge temperature provided in an embodiment of the present application.

[0039] Figure 2 A flow chart of details of the method for determining the slurry discharge temperature provided in an embodiment of the present application.

[0040] Figure 3 A flow chart of details of a method for determining a slurry discharge temperature provided in another embodiment of the present application.

[0041] Figure 4 A detailed flowchart of a method for determining the slurry discharge temperature provided in yet another embodiment of the present application.

[0042] Figure 5 It is a slurry temperature-time change curve diagram and a corresponding slurry temperature change rate-time change curve diagram in the embodiment of the present application.

[0043] Figure 6 It is a slurry viscosity-time change curve diagram and a corresponding slurry viscosity change rate-time change curve diagram in the embodiment of the present application.

[0044] Figure 7It is a slurry viscosity-slurry temperature change curve diagram and a corresponding viscosity change rate-temperature change curve diagram in the embodiment of the present application.

[0045] Figure 8 This is a schematic diagram of the viscosity of the multi-cylinder slurry at the highest discharge temperature in the embodiment of the present application. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0047] Lithium-ion batteries have been widely used in portable consumer electronics, electric vehicles, and energy storage. The manufacturing process of lithium-ion batteries includes pulping, slurry mixing, sheeting, assembly, liquid injection, and formation. Among them, pulping is the first step in the production of lithium-ion batteries, and the pulping time directly affects the production capacity of lithium-ion batteries. The pulping steps are divided into feeding, stirring, cooling, and discharging. The viscosity of high-temperature slurry is low and unstable, which does not meet the requirements for discharging coating. Therefore, it is necessary to wait for the temperature of the slurry to decrease - the viscosity increases and stabilizes to the discharging standard before discharging. The relevant technology is to determine whether the slurry has reached the preset viscosity by measuring the low-temperature viscosity of the slurry, but because the low-temperature viscosity is generally room temperature and the discharging temperature is low, as the discharging temperature decreases, the heat transfer driving force weakens, the cooling is slow, and the cooling time is long, even exceeding half of the stirring time, which affects the pulping capacity.

[0048] The present application provides a method and a readable storage medium for determining the discharge temperature of pulp, predicting the room temperature viscosity by high temperature viscosity, and using the high temperature viscosity as the discharge standard to solve the problem of long cooling time in the existing pulping process. The following will be described in conjunction with the accompanying drawings.

[0049] The method for determining the slurry discharge temperature provided in the embodiment of the present application can be applied to the pulping process. Figure 1 , Figure 5 and Figure 6 , Figure 1 A schematic flow chart of a method for determining the slurry discharge temperature provided in an embodiment of the present application. Figure 5 It is a slurry temperature-time change curve diagram and a corresponding slurry temperature change rate-time change curve diagram in the embodiment of the present application. Figure 6 It is a slurry viscosity-time change curve diagram and a corresponding slurry viscosity change rate-time change curve diagram in the embodiment of the present application.

[0050] The method for determining the slurry discharge temperature comprises the following steps:

[0051] S100, obtaining slurry temperature and slurry viscosity at multiple different times;

[0052] S200, drawing a slurry temperature-time variation curve diagram according to the mapping relationship between the slurry temperature and time of each group, and drawing a slurry viscosity-time variation curve diagram according to the mapping relationship between the slurry viscosity and time of each group;

[0053] S300, obtaining a reference value when the temperature change rate is less than or equal to a preset rate according to the slurry temperature-time change curve; the reference value is a temperature value or a time point;

[0054] S400, based on the time point and the slurry viscosity-time variation curve graph, or based on the temperature value, the slurry viscosity-time variation curve graph and the slurry temperature-time variation curve graph, obtaining a stable viscosity value corresponding to the reference value;

[0055] S500, determining that a stable viscosity value is within a preset viscosity range, and taking the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature.

[0056] In the present embodiment, specifically, the slurry includes a mixed N-methylpyrrolidone solvent (NMP) and polyvinylidene fluoride (PVDF). Heating, dissolving and stirring are required during the slurry preparation process. The prepared slurry has a high temperature, low viscosity and is unstable. It is necessary to wait for the temperature to drop, the viscosity to increase and stabilize before discharging. In step S100, the slurry temperature can be obtained by a thermometer, and the slurry viscosity can be obtained by a viscometer. The interval length for obtaining the slurry temperature and slurry viscosity each time can be the same or different. For example, the slurry temperature can be obtained every 1 minute; for the slurry viscosity, the slurry viscosity can be obtained every 0.5°C when the temperature drops, and the interval length for every 0.5°C drop in temperature is recorded.

[0057] Figure 5 and Figure 6 The slurry temperature-time change curve and the slurry viscosity-time change curve drawn according to step S200 are shown respectively. It can be seen that as the temperature decreases, the temperature change rate of the slurry gradually slows down, and the viscosity change rate of the slurry also becomes slower and slower.

[0058] In step S300, when the temperature change rate of the slurry is less than or equal to the preset rate (such as 0.1°C / min), it means that the slurry temperature has stabilized and the slurry viscosity has also stabilized. In other words, when the slurry temperature drops to the reference value, it can be considered that the temperature and viscosity of the slurry have stabilized, and the high temperature can predict whether the room temperature viscosity of the slurry meets the coating viscosity standard. Therefore, in step S400, if the stable viscosity value corresponding to the reference value is in the preset viscosity range at this time, it means that the slurry viscosity has reached the discharging standard and can be discharged. The slurry temperature corresponding to the temperature viscosity value can be used as the maximum discharging temperature, that is, the subsequently prepared slurry can be discharged when it is cooled to the maximum discharging temperature, without waiting for the slurry to drop to room temperature before discharging.

[0059] For example, by Figure 5 It can be seen that when the cooling time reaches 60 minutes, the temperature change rate of the slurry is less than or equal to 0.1℃ / min, and the slurry temperature at this time is 33℃; that is, the preset rate is 0.1℃ / min, and the reference value is the temperature value of 33℃ and the time point of 60min. According to the reference value and Figure 6 It can be seen that the stable slurry viscosity at this time is 5650 mPa·s, which is within the preset viscosity range [5600, 6000] mPa·s and meets the discharge standard. Therefore, 33°C can be used as the maximum discharge temperature of the slurry. That is, the subsequently prepared slurry only needs to be cooled to 33°C for discharge.

[0060] It can be understood that the maximum discharge temperature obtained by this method can be applied to slurries prepared with the same ingredients and under the same conditions; that is, the slurries prepared subsequently with the same ingredients and under the same conditions can directly adopt the maximum discharge temperature obtained in the above embodiment, and adopt the viscosity standard at this temperature. The high-temperature viscosity meets the standard, that is, the room-temperature viscosity is also within the standard range, and there is no need to wait for the slurry to cool to room temperature before measuring the viscosity. In this way, the cooling time can be shortened, and the high-temperature viscosity and room-temperature viscosity corresponding to the high-temperature discharge also meet the coating viscosity requirements, and the high-temperature viscosity is relatively stable, which can reflect the performance of the slurry and can be used as a standard for evaluating the performance of the slurry. By increasing the discharge temperature, the time required for cooling can be reduced, thereby increasing the pulping capacity.

[0061] It should be noted that the discharge temperature of the slurry can be strictly in accordance with the maximum discharge temperature, or the discharge temperature range can be set with the maximum discharge temperature as the extreme value. Exemplarily, after the step of taking the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature, the step further includes: taking the difference between the maximum discharge temperature and the preset allowable difference as the minimum discharge temperature.

[0062] The preset allowable difference can be 10°C. Combined with the above embodiment in which the maximum discharge temperature is 33°C, the discharge temperature range of the slurry is set to [23, 33]°C. After reaching the maximum discharge temperature, even if the temperature continues to drop, the slurry viscosity will not change significantly, that is, it will not easily exceed the preset viscosity range. Therefore, it is only necessary to discharge the slurry within the discharge temperature range.

[0063] The method for determining the slurry discharge temperature provided in the embodiment of the present application is to draw a slurry temperature-time change curve diagram and a slurry viscosity-time change curve diagram respectively through the mapping relationship between the slurry temperature and time and the mapping relationship between the slurry viscosity and time, obtain a reference value when the temperature change rate is less than or equal to the preset rate through the slurry temperature-time change curve diagram, and then obtain a stable viscosity value through the reference value. If the stable viscosity value is in the preset viscosity range, the slurry temperature corresponding to the stable viscosity value is used as the maximum discharge temperature. In this way, the discharge timing of the slurry only needs to be determined according to the high temperature of the slurry, and the room temperature viscosity is predicted by the high temperature viscosity. The high temperature viscosity is used as the discharge standard. The waiting time for measuring the high temperature viscosity of the slurry is shorter than that for measuring the low temperature viscosity of the slurry, and the result is more reliable, thereby effectively shortening the waiting time for cooling the slurry to improve the pulping capacity.

[0064] In step S300, the reference value can be obtained by first taking a point on the slurry temperature-time change curve to calculate the temperature change rate, until the temperature change rate calculated at the taken point is less than or equal to the preset rate, and the point is used as the reference value. Of course, it can also be obtained in other ways.

[0065] For example, Figure 2 As stated, Figure 2 A detailed flow chart of a method for determining the slurry discharge temperature provided in an embodiment of the present application. The step of obtaining a reference value when the temperature change rate is less than or equal to a preset rate according to the slurry temperature-time change curve diagram comprises:

[0066] S310, obtaining a first relationship equation by fitting a slurry temperature-time variation curve diagram, wherein the first relationship equation is a relationship equation between slurry temperature and time;

[0067] S320, deriving the first relational expression to obtain a second relational expression, where the second relational expression is a relational expression between the slurry temperature change rate and time;

[0068] S330. Obtain the reference value according to the preset rate, the second relational expression, and the first relational expression.

[0069] The slurry temperature-time variation curve can be specifically obtained by fitting the first relationship through computer software, refer to Figure 5 The slurry temperature-time variation curve in the figure, the first relationship obtained by fitting is: y = 27.59 + 21.29 * 0.97∧ x, where y is temperature and x is time.

[0070] After taking the derivative of the first relational expression, a second relational expression can be obtained, which is a relational expression between the slurry temperature change rate and time. According to the second relational expression, a slurry temperature change rate-time change curve can be drawn. Substituting the preset rate into the second relational expression or the slurry temperature change rate-time change curve can obtain the time point of the reference value, and substituting the time point of the reference value into the first relational expression or the slurry temperature-time change curve can obtain the temperature value of the reference value. In this way, the process of obtaining the reference value can be simplified.

[0071] In order to ensure the reliability of the first relational expression, the first relational expression needs to be verified. For example, Figure 3 As shown, Figure 3 A detailed flow chart of a method for determining the slurry discharge temperature provided in another embodiment of the present application. The step of fitting a first relationship according to the slurry temperature-time variation curve, wherein the first relationship is a relationship between the slurry temperature and time, comprises:

[0072] S311, obtaining a first relationship equation according to the slurry temperature-time variation curve fitting;

[0073] S312, obtaining a first curve fitting correlation coefficient according to the first relationship and the slurry temperature-time variation curve diagram;

[0074] S313, determining that the first curve fitting correlation coefficient is greater than or equal to a preset coefficient, and using the first relationship as the relationship between the slurry temperature and time.

[0075] The curve fitting correlation coefficient can represent the degree of fit between the first relationship and the slurry temperature-time variation curve. If the curve fitting correlation coefficient is greater than or equal to a preset coefficient (such as 0.995), it means that the first relationship is highly fitted to the slurry temperature-time variation curve, and the relationship can be used as the relationship between the slurry temperature and time. The calculation process of the first curve fitting correlation coefficient can be implemented by computer software to further simplify the confirmation process of the first relationship.

[0076] In step S400, the stable viscosity value can be obtained based on the time point and the slurry viscosity-time variation curve, or based on the temperature value, the slurry viscosity-time variation curve, and the slurry temperature-time variation curve, and there is no limitation here. For example, the step of obtaining the stable viscosity value corresponding to the reference value based on the time point and the slurry viscosity-time variation curve, or based on the temperature value, the slurry viscosity-time variation curve, and the slurry temperature-time variation curve includes: substituting the time point in the reference value into the slurry viscosity-time variation curve to obtain the stable viscosity value.

[0077] During the cooling process of the slurry, the slurry temperature and slurry viscosity change along the same time axis, so at the same time point, the slurry viscosity and slurry temperature can be determined simultaneously. In other words, after determining the reference value, the time point of the reference value can be substituted into the slurry viscosity-time change curve to obtain the stable viscosity value corresponding to the reference value.

[0078] Of course, in another embodiment, the stable viscosity value can also be obtained based on the temperature value, the slurry viscosity-time change curve and the slurry temperature-time change curve. Figure 4 , Figure 4 A detailed flow chart of a method for determining the slurry discharge temperature provided in another embodiment of the present application. The step of obtaining the stable viscosity value corresponding to the reference value based on the time point and the slurry viscosity-time change curve, or based on the temperature value, the slurry viscosity-time change curve and the slurry temperature-time change curve comprises:

[0079] S410, drawing a slurry viscosity-slurry temperature change curve diagram according to the slurry temperature-time change curve diagram and the slurry viscosity-time change curve diagram;

[0080] S420, determining a stable viscosity value according to a slurry viscosity-slurry temperature variation curve and a temperature value in a reference value.

[0081] Under the condition of certain materials and preparation process, the viscosity of the slurry is only related to the temperature. The correlation between the slurry viscosity and the slurry temperature can be deduced from the slurry viscosity-slurry temperature change curve. From the slurry temperature and time correlation curve, the temperature value of the reference value is substituted into the slurry viscosity-slurry temperature change curve to directly obtain the stable viscosity value.

[0082] In another embodiment, a slurry viscosity-slurry temperature change curve is plotted, and a stable viscosity value can be obtained in another way. Exemplarily, the step of determining the stable viscosity value according to the slurry viscosity-slurry temperature change curve and the temperature value in the reference value includes:

[0083] S421, obtaining a third relationship equation according to the slurry viscosity-slurry temperature variation curve diagram by fitting, wherein the third relationship equation is a relationship equation between the slurry viscosity and the slurry temperature;

[0084] S422. Substitute the temperature value in the reference value into the third relationship to obtain a stable viscosity value.

[0085] The slurry viscosity-slurry temperature change curve can be specifically fitted by computer software to obtain the third relationship, refer to Figure 7 The third relationship obtained by fitting the slurry viscosity-slurry temperature change curve is: y = 18959-597.5*x+6.054*x ∧ 2, where y is viscosity and x is temperature.

[0086] Substituting the temperature value of the reference value into the third relational equation, the stable viscosity value can be directly obtained, and the stable viscosity value is more real and reliable.

[0087] In order to ensure the reliability of the third relationship, the third relationship needs to be verified. Exemplarily, the step of obtaining the third relationship according to the slurry viscosity-slurry temperature change curve, wherein the third relationship is the relationship between the slurry viscosity and the slurry temperature, includes:

[0088] The third relationship is obtained by fitting the slurry viscosity-slurry temperature variation curve diagram;

[0089] Obtaining a third curve fitting correlation coefficient according to the third relationship and the slurry viscosity-slurry temperature variation curve diagram;

[0090] It is determined that the third curve fitting correlation coefficient is greater than or equal to the preset coefficient, and the third relationship is used as the relationship between the slurry viscosity and the slurry temperature.

[0091] The curve fitting correlation coefficient can represent the degree of fit between the third relationship and the slurry viscosity-slurry temperature change curve. If the curve fitting correlation coefficient is greater than or equal to a preset coefficient (such as 0.995), it means that the third relationship is highly fitted to the slurry viscosity-slurry temperature change curve, and the third relationship can be used as the relationship between slurry temperature and slurry viscosity. The calculation process of the third curve fitting correlation coefficient can be implemented by computer software to further simplify the confirmation process of the third relationship.

[0092] In practical applications, in order to verify the reliability of the maximum discharge temperature, multiple groups of slurries need to be tested. Exemplarily, the number of the slurries is multiple groups to obtain multiple stable viscosity values; the step of determining the stable viscosity value in the preset viscosity range and taking the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature includes:

[0093] Determine that a plurality of stable viscosity values ​​are within a preset viscosity range, and use the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature.

[0094] In this way, by testing the stable viscosity values ​​of multiple groups of slurries at the highest discharge temperature, the reliability of the highest discharge temperature can be further ensured.

[0095] In addition, an embodiment of the present invention further provides a readable storage medium.

[0096] A control program is stored on the readable storage medium, and when the control program is executed by the processor, the steps of the method for determining the slurry discharge temperature as described above are implemented.

[0097] The readable storage medium of the present invention may be a computer-readable storage medium, and its specific implementation is substantially the same as the above-mentioned embodiments of the method for determining the slurry discharge temperature, and will not be described in detail here.

[0098] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0099] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. The method for determining the slurry discharge temperature provided in the embodiments of the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and scope of application. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for determining the slurry discharge temperature, characterized in that: The following steps are involved: Obtaining slurry temperature and slurry viscosity at multiple different times; A slurry temperature-time variation curve is drawn according to the mapping relationship between the slurry temperature and time in each group, and a slurry viscosity-time variation curve is drawn according to the mapping relationship between the slurry viscosity and time in each group; Obtaining a reference value when the temperature change rate is less than or equal to a preset rate according to the slurry temperature-time change curve; the reference value is a temperature value or a time point; Based on the time point and the slurry viscosity-time variation curve graph, or based on the temperature value, the slurry viscosity-time variation curve graph and the slurry temperature-time variation curve graph, obtaining a stable viscosity value corresponding to the reference value; Determine that the stable viscosity value is within a preset viscosity range, and use the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature.

2. The method for determining the slurry discharge temperature according to claim 1, characterized in that: The step of obtaining a reference value when the temperature change rate is less than or equal to a preset rate according to the slurry temperature-time change curve diagram comprises: Obtaining a first relationship equation by fitting a slurry temperature-time variation curve diagram, wherein the first relationship equation is a relationship equation between slurry temperature and time; The first relational expression is derived to obtain a second relational expression, wherein the second relational expression is a relational expression between the slurry temperature change rate and time; The reference value is obtained according to the preset rate, the second relational expression and the first relational expression.

3. The method for determining the slurry discharge temperature according to claim 2, characterized in that: The step of obtaining a first relationship equation by fitting the slurry temperature-time variation curve, wherein the first relationship equation is a relationship equation between the slurry temperature and time, comprises: Obtaining a first relationship by fitting the slurry temperature-time variation curve; Obtaining a first fitting curve correlation coefficient according to the first relationship and the slurry temperature-time variation curve diagram; It is determined that the correlation coefficient of the first fitting curve is greater than or equal to the preset coefficient, and the first relationship is used as the relationship between the slurry temperature and time.

4. The method for determining the slurry discharge temperature according to claim 1, characterized in that: The step of obtaining the stable viscosity value corresponding to the reference value based on the time point and the slurry viscosity-time variation curve graph, or based on the temperature value, the slurry viscosity-time variation curve graph and the slurry temperature-time variation curve graph, comprises: Draw a slurry viscosity-slurry temperature change curve diagram according to the slurry temperature-time change curve diagram and the slurry viscosity-time change curve diagram; The stable viscosity value is determined according to the slurry viscosity-slurry temperature change curve and the temperature value in the reference value.

5. The method for determining the slurry discharge temperature according to claim 4, characterized in that: The step of determining the stable viscosity value according to the slurry viscosity-slurry temperature change curve and the temperature value in the reference value comprises: Obtaining a third relationship equation by fitting the slurry viscosity-slurry temperature variation curve diagram, wherein the third relationship equation is a relationship equation between the slurry viscosity and the slurry temperature; Substitute the temperature value from the reference into the third relationship to obtain the steady viscosity value.

6. The method for determining the slurry discharge temperature according to claim 5, characterized in that: The step of obtaining a third relationship by fitting the slurry viscosity-slurry temperature variation curve, wherein the third relationship is a relationship between slurry viscosity and slurry temperature, comprises: The third relationship is obtained by fitting the slurry viscosity-slurry temperature variation curve diagram; Obtaining a second curve fitting correlation coefficient according to the third relationship and the slurry viscosity-slurry temperature variation curve diagram; It is determined that the second curve fitting correlation coefficient is greater than or equal to a preset coefficient, and the third relationship is used as the relationship between the slurry viscosity and the slurry temperature.

7. The method for determining the slurry discharge temperature according to any one of claims 1 to 6, characterized in that: After the step of taking the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature, the method further includes: The difference between the maximum discharge temperature and the preset allowable difference is taken as the minimum discharge temperature.

8. The method for determining the slurry discharge temperature according to any one of claims 1 to 6, characterized in that: The number of the slurries is multiple groups to obtain multiple stable viscosity values; The step of determining that the stable viscosity value is within a preset viscosity range and taking the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature comprises: Determine that a plurality of stable viscosity values ​​are within a preset viscosity range, and use the slurry temperature corresponding to the stable viscosity value as the maximum discharge temperature.

9. The method for determining the slurry discharge temperature according to claim 1, characterized in that: The step of obtaining the stable viscosity value corresponding to the reference value based on the time point and the slurry viscosity-time variation curve graph, or based on the temperature value, the slurry viscosity-time variation curve graph and the slurry temperature-time variation curve graph, comprises: Substitute the time points in the reference value into the slurry viscosity-time variation curve to obtain the stable viscosity value.

10. A readable storage medium, characterized in that: The readable storage medium stores a control program, and when the control program is executed by a processor, the steps of the method for determining the slurry discharge temperature according to any one of claims 1 to 9 are implemented.

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