Micro-reactor real-time control system for fine chemical engineering

Abstract

The invention relates to the technical field of temperature control, and particularly discloses a micro-reactor real-time control system for fine chemical engineering, and the system comprises an acquisition module which calculates a standard temperature according to the temperature at a monitoring point, and periodically obtains the standard temperature in a preset acquisition period; the analysis module is used for calculating a temperature difference value, obtaining a maximum temperature difference value and obtaining a temperature change value; coordinate points are generated and fitted to obtain a fitted curve, and the total number of reference points on the fitted curve is counted; and the adjusting module is used for calculating the judgment value, determining whether to adjust the power of the temperature adjusting module or not according to the judgment value, and adjusting the power of the temperature adjusting module according to the fitting curve. According to the invention, the environment temperature in the microreactor can be kept stable, and the complexity of controlling the temperature in the pipeline is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of temperature control, and in particular to a real-time control system of a micro-reactor for fine chemical industry. Background Art

[0002] Chemical engineering is the abbreviation of "chemical technology", "chemical industry" and "chemical engineering". Any technology that uses chemical methods to change the composition and structure of substances or synthesize new substances belongs to chemical production technology, that is, chemical technology. The resulting products are called chemicals or chemical products.

[0003] A microreactor is a three-dimensional structural element that can be used for chemical reactions and is manufactured on a solid matrix using special micromachining techniques. A microreactor usually contains small channel sizes (equivalent diameter less than 500 µm) and channel diversity, in which fluids flow and in which the required reactions occur.

[0004] The inside of a microreactor usually contains many tiny channels, in which reactants flow and undergo chemical reactions. During the chemical reaction, the reaction conditions, such as temperature, need to be strictly controlled. The higher the temperature, the faster the reaction rate. However, too high a temperature may cause the reaction rate to be too fast, making it difficult to control, or even cause side reactions, affecting the quality and yield of the product. There is heat exchange between the pipes inside the microreactor and the environment. Different ambient temperatures and the temperatures of the reactants in the pipes will affect the heat exchange efficiency, and thus affect the temperature in the pipes. In this case, if the temperature in the pipe is controlled, it is necessary to consider the impact of changes in ambient temperature, which increases the complexity of temperature control in the pipe. Based on this, a real-time control system for a microreactor for fine chemicals is proposed to ensure that the ambient temperature inside the microreactor is constant and reduce the complexity of controlling the temperature in the pipe. Summary of the invention

[0005] The purpose of the present invention is to provide a real-time control system for a microreactor for fine chemical industry to solve the following technical problems: There is heat exchange between the pipe inside the microreactor and the environment. Different ambient temperatures and the temperature of the reactants in the pipe will affect the heat exchange efficiency, and then affect the temperature in the pipe. In this case, if the temperature in the pipe is controlled, it is necessary to consider the impact of the ambient temperature change, which increases the complexity of the temperature control in the pipe.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A real-time control system for a microreactor for fine chemical industry, comprising: Acquisition module: monitoring points are set at equal intervals inside the microreactor, and the distance between two adjacent monitoring points is a preset value. The temperature inside the microreactor is obtained at the monitoring points, and the average value is calculated as the standard temperature. The standard temperature is periodically obtained within a preset acquisition period; Analysis module: Sort the standard temperatures in time order and calculate the temperature difference TCZ a =T a -T a-1 , T a Indicates the standard temperature described in the order a, and obtains the maximum temperature difference TCZ max , and obtain the temperature change value TBH=T n -T1, n represents the total number of times the standard temperature is obtained; Generate coordinate points (a, T a ), T a represents the standard temperature obtained for the ath time, fitting the coordinate points to obtain a fitting curve f(t), and counting the total number of reference points on the fitting curve, wherein the reference points include peak points and valley points; Adjustment module: Calculate the judgment value P=η*m(TCZ max +TBH)*max(|T max -TPJ|,|T min -TPJ|), where η represents the preset correction coefficient, m represents the total number of reference points, T max =max(f(t)), Tmin=min(f(t)), TPJ represents the average target temperature; When the judgment value P≥Pys, the power of the temperature regulating module is adjusted according to the fitting curve until the next acquisition cycle adjacent to the current acquisition cycle ends, and Pys represents a preset judgment value threshold.

[0007] As a further solution of the present invention: in the adjustment module, the process of adjusting the power of the temperature adjustment module is specifically as follows: The predicted time t end +Δt is substituted into the fitting curve f(t) to obtain the predicted temperature T yc , t end represents the time point corresponding to the end point of the acquisition cycle, Δt represents the time interval between two consecutive acquisitions of the target temperature, and the power of the temperature adjustment module is K=ε(1+(T yc -T n ) / T n )*K end , ε represents the preset power correction factor, K end Indicates the power of the temperature control module at the time point corresponding to the end point of the acquisition cycle; At time t end +Δt, repeat the above steps until the next acquisition cycle adjacent to the current acquisition cycle ends.

[0008] As a further solution of the present invention: in the adjustment module, the average target temperature .

[0009] As a further solution of the present invention: in the acquisition module, the process of calculating the standard temperature also includes the following steps: The difference between the temperature at the monitoring point and the mean is calculated. When the difference is greater than or equal to the preset value, the temperature at the corresponding monitoring point is removed and the mean is calculated again.

[0010] As a further solution of the present invention: the temperature at the monitoring point is obtained based on a sensor.

[0011] As a further solution of the present invention: in the adjustment module, when the judgment value P≥3Pys, an early warning message is sent for prompting.

[0012] As a further solution of the present invention: in the acquisition module, when the difference between two consecutive standard temperatures obtained is greater than or equal to a preset difference threshold, an early warning message is sent for prompting.

[0013] Beneficial effects of the present invention: In this scheme, first, multiple monitoring points are set at equal intervals inside the microreactor, and the distance between adjacent monitoring points is a preset value. The purpose of this is to comprehensively monitor the temperature distribution inside the reactor, avoid deviations caused by single-point measurement, and obtain more accurate temperature data; obtain the temperature inside the reactor at these monitoring points, and then calculate the average value of these temperatures as the standard temperature. By taking the average value, local temperature fluctuations can be smoothed out and the overall temperature state of the reactor can be more accurately reflected; within the preset collection period, the standard temperature is periodically obtained, which ensures the real-time nature of the temperature data and provides reliable basic data for subsequent temperature trend analysis; the regular collection of standard temperatures ensures that temperature changes can be tracked in real time, thereby providing a reliable basis for the next step of temperature change trend analysis; thereafter, the temperature change trend inside the microreactor is analyzed to obtain the characteristic values ​​of temperature fluctuations. Through these characteristic values, data support is provided for subsequent judgments on whether the power of the temperature regulation module needs to be adjusted, such as the maximum temperature difference TCZ max, which is larger, indicating that the temperature has changed significantly after a certain collection. This may indicate that there are drastic temperature fluctuations inside the reactor, which may affect the stability of the reaction. Therefore, adjustments should be made. The maximum temperature difference can help identify drastic temperature changes in a short period of time. The relationship between the remaining parameters and the judgment value refers to the above ideas and will not be repeated here. It should be noted that frequent power adjustments will not only increase the workload of the system, but may also cause the reactor temperature to be unstable and affect the reaction efficiency. Therefore, in this solution, it is first determined whether adjustments are needed to avoid frequent system adjustments, extend the service life of the equipment, and improve the stability of temperature regulation. Finally, when the judgment value is greater than the preset judgment value threshold, the power is adjusted to ensure that the ambient temperature inside the microreactor is stable and reduce the complexity of controlling the temperature in the pipeline. The present invention can keep the ambient temperature inside the microreactor stable and reduce the complexity of controlling the temperature in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] Figure 1 The present invention is a schematic flow diagram of a real-time control system for a micro-reactor for fine chemical industry. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1 As shown, the present invention is a real-time control system for a microreactor for fine chemical industry, comprising: Acquisition module: monitoring points are set at equal intervals inside the microreactor, and the distance between two adjacent monitoring points is a preset value. The temperature inside the microreactor is obtained at the monitoring points, and the average value is calculated as the standard temperature. The standard temperature is periodically obtained within a preset acquisition period; Analysis module: Sort the standard temperatures in time order and calculate the temperature difference TCZ a =T a -T a-1 , T a Indicates the standard temperature described in the order a, and obtains the maximum temperature difference TCZ max , and obtain the temperature change value TBH=T n -T1, n represents the total number of times the standard temperature is obtained; Generate coordinate points (a, T a ), T a represents the standard temperature obtained for the ath time, fitting the coordinate points to obtain a fitting curve f(t), and counting the total number of reference points on the fitting curve, wherein the reference points include peak points and valley points; Calculate the judgment value P = η * m (TCZ max +TBH)*max(|T max -TPJ|,|T min -TPJ|), where η represents the preset correction coefficient, m represents the total number of reference points, T max =max(f(t)), Tmin=min(f(t)), TPJ represents the average target temperature; Adjustment module: When the judgment value P≥Pys, the power of the temperature adjustment module is adjusted according to the fitting curve until the next acquisition cycle adjacent to the current acquisition cycle ends, and Pys represents a preset judgment value threshold.

[0018] It should be noted that, first, multiple monitoring points are set at equal intervals inside the microreactor, and the distance between adjacent monitoring points is a preset value. The purpose of this is to comprehensively monitor the temperature distribution inside the reactor, avoid deviations caused by single-point measurement, and obtain more accurate temperature data; obtain the temperature inside the reactor at these monitoring points, and then calculate the average value of these temperatures as the standard temperature. By taking the average value, local temperature fluctuations can be smoothed out and the overall temperature state of the reactor can be more accurately reflected; within the preset collection period, the standard temperature is periodically obtained, which ensures the real-time nature of the temperature data and provides reliable basic data for subsequent temperature trend analysis; the regular collection of standard temperature ensures that temperature changes can be tracked in real time, thereby providing a reliable basis for the next step of temperature change trend analysis; after that, the temperature change trend inside the microreactor is analyzed to obtain the characteristic values ​​of temperature fluctuations. Through these characteristic values, data support is provided for subsequent judgments on whether the power of the temperature regulation module needs to be adjusted, such as the maximum temperature difference TCZ max, which is larger, indicating that the temperature has changed significantly after a certain collection. This may indicate that there are drastic temperature fluctuations inside the reactor, which may affect the stability of the reaction. Therefore, adjustments should be made. The maximum temperature difference can help identify drastic temperature changes in a short period of time. The relationship between the remaining parameters and the judgment value can refer to the above ideas and will not be repeated here. It should be noted that frequent power adjustments will not only increase the workload of the system, but may also cause unstable reactor temperature and affect reaction efficiency. Therefore, in this scheme, it is first determined whether adjustments are needed to avoid frequent system adjustments, extend the service life of the equipment, and improve the stability of temperature regulation. Finally, when the judgment value is greater than the preset judgment value threshold, the power is adjusted to ensure the stability of the ambient temperature inside the microreactor and reduce the complexity of controlling the temperature in the pipeline.

[0019] In another preferred embodiment of the present invention, in the adjustment module, the process of adjusting the power of the temperature adjustment module is specifically as follows: The predicted time t end +Δt is substituted into the fitting curve f(t) to obtain the predicted temperature T yc , t end represents the time point corresponding to the end point of the acquisition cycle, Δt represents the time interval between two consecutive acquisitions of the target temperature, and the power of the temperature adjustment module is K=ε(1+(T yc -T n ) / T n )*K end , ε represents the preset power correction factor, K end Indicates the power of the temperature control module at the time point corresponding to the end point of the acquisition cycle; At time t end +Δt, repeat the above steps until the next acquisition cycle adjacent to the current acquisition cycle ends.

[0020] It is worth noting that frequent power adjustment will not only increase the workload of the system, but may also cause the reactor temperature to be unstable and affect the reaction efficiency. Therefore, in this scheme, it is first determined whether adjustment is needed to avoid frequent system adjustments, extend the service life of the equipment, and improve the stability of temperature regulation; finally, when the judgment value is greater than the preset judgment value threshold, the power is adjusted to ensure the stability of the ambient temperature inside the microreactor and reduce the complexity of controlling the temperature in the pipeline; in this way, according to the predicted trend of the temperature, the power is appropriately adjusted to ensure that the temperature inside the reactor gradually approaches the target value. When the time is tend+Δt, the predicted time becomes t end +2Δt, repeat the above adjustment steps until the end of the next collection cycle to ensure that the ambient temperature inside the microreactor is constant and to ensure the stability and efficiency of the reaction.

[0021] In another preferred embodiment of the present invention, in the adjustment module, the average target temperature .

[0022] In another preferred embodiment of the present invention, in the acquisition module, the process of calculating the standard temperature further includes the following steps: The difference between the temperature at the monitoring point and the mean is calculated. When the difference is greater than or equal to the preset value, the temperature at the corresponding monitoring point is removed and the mean is calculated again.

[0023] It should be noted that if the difference between the temperature of some monitoring points and the mean is greater than or equal to the preset threshold, these data are considered to be outliers, which may be affected by the local environment or measurement errors, resulting in deviations from the overall temperature level. In order to reduce the impact of this deviation on the mean, the system will remove the temperature data of the monitoring points corresponding to these outliers. Then, after eliminating these data with large deviations, the mean of the remaining data is recalculated to obtain a more accurate standard temperature, reduce deviations caused by local temperature fluctuations or equipment errors, and ensure that the obtained standard temperature more accurately reflects the overall temperature state of the reactor.

[0024] In another preferred embodiment of the present invention, the temperature at the monitoring point is obtained based on a sensor.

[0025] It should be noted that the use of sensors can ensure high accuracy and real-time performance of temperature data, thereby more sensitively reflecting temperature changes inside the reactor, avoiding errors and lags caused by manual measurement, and enabling the system to obtain reliable temperature data, providing a more accurate basis for subsequent temperature analysis and adjustment; based on the way in which the sensor acquires temperature, it can realize automated data collection, reduce the need for manual intervention, and thus improve the work efficiency and stability of the entire system. The sensor can collect temperature in real time and continuously, allowing the system to obtain sufficient temperature data in each collection cycle, which not only helps to improve the calculation accuracy of the standard temperature, but also ensures that subtle changes in temperature fluctuations are captured in a timely manner, providing more comprehensive information support for judgment and adjustment.

[0026] In another preferred embodiment of the present invention, in the adjustment module, when the judgment value P≥3Pys, an early warning message is sent for prompting.

[0027] It is understandable that the sending of early warning information is equivalent to issuing an alarm to the operator or control system, reminding the operator or control system that the temperature fluctuation inside the reactor is too large, which may affect the stability of the reaction or there is a potential fault. This setting enables the system to quickly send a signal when the temperature control is abnormal, so as to facilitate timely adoption of corresponding measures, such as checking the equipment condition, adjusting process parameters or suspending the reaction, thereby avoiding safety risks caused by temperature out of control.

[0028] In another preferred embodiment of the present invention, in the acquisition module, when the difference between two consecutive standard temperatures obtained is greater than or equal to a preset difference threshold, an early warning message is sent for prompting.

[0029] It is worth noting that early warning information is issued at the beginning of a sharp temperature fluctuation to alert operators or control systems to possible abnormal conditions. Significant differences between two adjacent standard temperatures usually mean that unexpected temperature fluctuations may have occurred in the reactor, which may be caused by equipment failure, aggravated reaction abnormalities, or sudden changes in external conditions. The sending of early warning information can help operators detect abnormalities in a timely manner, facilitate rapid inspection or intervention, prevent further development of temperature out of control, and ensure the safety and stability of the reaction process.

[0030] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A real-time control system for a microreactor for fine chemical industry, comprising: include: Acquisition module: monitoring points are set at equal intervals inside the microreactor, and the distance between two adjacent monitoring points is a preset value. The temperature inside the microreactor is obtained at the monitoring points, and the average value is calculated as the standard temperature. The standard temperature is periodically obtained within a preset acquisition period; Analysis module: Sort the standard temperatures in time order and calculate the temperature difference TCZ a =T a -T a-1 , T a Indicates the standard temperature described in the order a, and obtains the maximum temperature difference TCZ max , and obtain the temperature change value TBH=T n -T1, n represents the total number of times the standard temperature is obtained; Generate coordinate points (a, T a ), T a represents the standard temperature obtained for the ath time, fitting the coordinate points to obtain a fitting curve f(t), and counting the total number of reference points on the fitting curve, wherein the reference points include peak points and valley points; Adjustment module: Calculate the judgment value P=η*m(TCZ max +TBH)*max(|T max -TPJ|,|T min -TPJ|), where η represents the preset correction coefficient, m represents the total number of reference points, T max =max(f(t)), Tmin=min(f(t)), TPJ represents the average target temperature; When the judgment value P≥Pys, the power of the temperature regulating module is adjusted according to the fitting curve until the next acquisition cycle adjacent to the current acquisition cycle ends, and Pys represents a preset judgment value threshold.

2. A real-time control system for a microreactor for fine chemical industry according to claim 1, characterized in that: In the adjustment module, the process of adjusting the power of the temperature adjustment module is specifically as follows: The predicted time t end +Δt is substituted into the fitting curve f(t) to obtain the predicted temperature T yc , t end represents the time point corresponding to the end point of the acquisition cycle, Δt represents the time interval between two consecutive acquisitions of the target temperature, and the power of the temperature adjustment module is K=ε(1+(T yc -T n ) / T n )*K end , ε represents the preset power correction factor, K end Indicates the power of the temperature control module at the time point corresponding to the end point of the acquisition cycle; At time t end +Δt, repeat the above steps until the next acquisition cycle adjacent to the current acquisition cycle ends.

3. A real-time control system for a microreactor for fine chemical industry according to claim 1, characterized in that: In the adjustment module, the average target temperature .

4. A real-time control system for a microreactor for fine chemical industry according to claim 1, characterized in that: In the acquisition module, the process of calculating the standard temperature also includes the following steps: The difference between the temperature at the monitoring point and the mean is calculated. When the difference is greater than or equal to a preset value, the temperature at the corresponding monitoring point is removed and the mean is calculated again.

5. A real-time control system for a microreactor for fine chemical industry according to claim 2, characterized in that: The temperature at the monitoring point is obtained based on the sensor.

6. A real-time control system for a microreactor for fine chemical industry according to claim 1, characterized in that: In the adjustment module, when the judgment value P≥3Pys, an early warning message is sent for prompting.

7. A real-time control system for a microreactor for fine chemical industry according to claim 1, characterized in that: In the acquisition module, when the difference between two consecutive standard temperatures obtained is greater than or equal to a preset difference threshold, an early warning message is sent for prompting.

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