Temperature compensation method and system in supercritical extraction reaction kettle

Abstract

The application discloses a supercritical extraction reaction kettle inner temperature compensation method and system, and relates to intelligent temperature control technology. The method comprises the following steps: obtaining the optimal pressure and the optimal temperature, and obtaining T2 and T0; inputting the optimal pressure, the gas outlet temperature T2 and the optimal temperature into a preset temperature compensation model, and receiving the output result of the temperature compensation model as temperature compensation data; and adjusting the heating temperature T0 according to the temperature compensation data to realize compensation adjustment of the target reaction kettle inner temperature. The supercritical extraction reaction kettle inner temperature compensation method and system can compensate and control the temperature in the reaction kettle based on the temperature compensation model according to the temperature data collected outside the reaction kettle, can control the temperature in the reaction kettle near the optimal temperature, and improves the extraction efficiency in the reaction kettle.

Description

Technical Field

[0001] This invention relates to intelligent temperature control technology, specifically to a method and system for temperature compensation in a supercritical extraction reactor. Background Technology

[0002] Supercritical carbon dioxide extraction devices are widely used for the extraction of oily organic compounds. Their efficiency is strongly correlated with the temperature and pressure within the extraction reactor, and different extraction processes require different pressures and temperatures. Therefore, during extraction, the extraction reactor needs to be sealed, and the temperature and pressure inside the reactor must be controlled to a optimal balance. Currently, most automatic control systems for supercritical extraction devices employ constant pressure and temperature control. While direct pressurization can effectively control the pressure inside the reactor, the internal temperature cannot be directly measured because the extraction reactor requires complete sealing and pressurization during the extraction process.

[0003] Most existing automatic control systems for supercritical fluid extraction devices measure the temperature within the sealing gap of the extraction vessel and assume a linear hysteresis characteristic for heat transfer from the heating chamber to the extraction vessel to form a temperature control scheme. However, in reality, the temperature transfer from the heating chamber to the extraction vessel is affected by structural factors such as the stainless steel vessel body, heat dissipation pipes, and exhaust pipe gaps, resulting in a significant difference between the temperature inside the vessel and the temperature within the sealing gap. Furthermore, the temperature inside the vessel is affected by changes in internal pressure. Therefore, although existing automatic control systems for supercritical fluid extraction devices can achieve automatic temperature and pressure regulation during the extraction process, the large errors in temperature measurement and control lead to low extraction efficiency. Summary of the Invention

[0004] In order to at least overcome the above-mentioned deficiencies in the prior art, the purpose of this application is to provide a method and system for temperature compensation in a supercritical extraction reactor.

[0005] In a first aspect, embodiments of this application provide a method for temperature compensation within a supercritical extraction reactor, including: Obtain the optimal pressure and optimal temperature corresponding to the optimal efficiency conditions of the current supercritical extraction process, and obtain the gas outlet temperature T2 of the target reactor and the heating temperature T0 for heating the outer wall of the target reactor; The optimal pressure, the gas outlet temperature T2, and the optimal temperature are input into a preset temperature compensation model, and the output of the temperature compensation model is received as temperature compensation data. The heating temperature T0 is adjusted based on the temperature compensation data to compensate for and adjust the temperature inside the target reactor.

[0006] In implementing this application's embodiments, during experiments with the supercritical extraction device, the inventors discovered that the main reason why the gas outlet temperature T2 could not accurately characterize the reaction temperature inside the reactor was that the temperature field inside the reactor was a dynamic temperature field, which was difficult to control when affected by external temperature rises and falls and by gas discharge. Based on this, this application's embodiments provide a scheme for compensating the heating temperature using a preset temperature compensation model.

[0007] In this embodiment, supercritical extraction processes typically correspond to optimal extraction temperatures and pressures. The purpose of this embodiment is to control the temperature and pressure within the reactor at their optimal levels to improve extraction efficiency. The gas outlet temperature T2 of the reactor can be detected by installing a temperature sensor at the gas outlet of the reactor's sealed cap, while the heating temperature T0 of the reactor's outer wall can be detected by installing a temperature sensor in the heating medium on the outer wall. Both temperatures are directly obtainable. Based on this data, temperature compensation data can be calculated using a pre-set temperature compensation model, and adjusting T0 with this compensation data will control the temperature within the reactor at the optimal extraction temperature. The temperature compensation model can be a fitted empirical model or a model trained using a neural network. This embodiment, through the above technical means, can compensate and control the temperature within the reactor based on temperature data collected outside the reactor and a temperature compensation model, thereby maintaining a relatively stable temperature within the reactor near the optimal level and improving extraction efficiency.

[0008] In one possible implementation, the extraction gas is preheated on the outer wall of the target reactor before entering it, and the extraction gas enters the target reactor at the bottom.

[0009] In one possible implementation, the construction of the temperature compensation model includes: A dynamic simulation test of open-loop temperature regulation at atmospheric pressure was conducted on the target reactor to obtain the external and internal heat transfer parameters of the target reactor. A thermal conductivity simulation model of the target reactor is constructed based on the external heat transfer parameters and the internal heat transfer parameters, and a pressure calculation is performed on the thermal conductivity simulation model to generate calculation results. The temperature compensation model is constructed based on the calculation results.

[0010] In one possible implementation, a dynamic simulation test of open-loop temperature regulation at atmospheric pressure is conducted on the target reactor to obtain the external and internal heat transfer parameters of the target reactor, including: A dynamic simulation test of open-loop temperature regulation at atmospheric pressure was conducted on the target reactor, and the gas outlet temperature T2', the heating temperature T0' for heating the outer wall of the target reactor, and the reaction temperature T1' inside the target reactor were recorded during the atmospheric pressure test; the pressure inside the target reactor was atmospheric pressure during the dynamic simulation test of open-loop temperature regulation at atmospheric pressure. The gas outlet of the target reactor is sealed, T0' is heated to a constant temperature T and the curve of T0' changing over time is recorded as the first temperature change curve, and the curve of T1' changing over time is recorded as the second temperature change curve. Record the moment when the first temperature change curve reaches a constant temperature T as the first moment, and record the moment when the second temperature change curve reaches a constant temperature T as the second moment; The external heat transfer parameters of the target reactor are calculated based on the difference between the first and second time points, and the difference between the initial temperatures of the isothermal T and the second temperature change curve. Open the gas outlet of the target reactor, keep T0' at a constant temperature T, and record the curve of T2' changing over time as the third temperature change curve; The moment when the third temperature change curve reaches a constant temperature T is recorded as the third moment, and the moment when the gas outlet of the target reactor is opened is recorded as the fourth moment; The internal heat transfer parameters of the target reactor are calculated based on the difference between the fourth and third time points, and the difference between the isothermal temperature T and the initial temperature of the third temperature change curve.

[0011] In one possible implementation, a thermal conductivity simulation model of the target reactor is constructed based on the external heat transfer parameters and the internal heat transfer parameters, and the simulation model is pressurized to generate calculation results, including: A thermal conductivity simulation model of the target reactor is constructed based on the internal heat transfer parameters and the external heat transfer parameters, and the internal heat transfer parameters are used as the initial parameters for internal heat transfer in the thermal conductivity simulation model. The internal pressure of the reactor in the thermal conductivity simulation model is calculated, and the internal heat transfer parameters are iterated. The gas outlet temperature T2'', the outer wall heating temperature T0'', the reaction temperature T1'', and the pressure N inside the reactor are obtained from multiple sets of pressurization calculation results to form multiple sets of data to be fitted as the calculation results.

[0012] In one possible implementation, constructing the temperature compensation model based on the calculation results includes: Based on the data to be fitted, T2'', T1'', T0'' and N are fitted to form a fitting function T0''=f(T2'', T1'', N); The fitting function T0''=f(T2'', T1'', N) is used as the temperature compensation model.

[0013] In one possible implementation, the optimal pressure, the gas outlet temperature T2, and the optimal temperature are input into a preset temperature compensation model, and the output of the temperature compensation model is received as temperature compensation data, including: The optimal pressure is used as N in the fitting function, the gas outlet temperature T2 is used as T2'' in the fitting function, and the optimal temperature is used as T1'' in the fitting function. The calculation result T0'' of the fitting function is received as temperature compensation data.

[0014] In one possible implementation, adjusting the heating temperature T0 based on the temperature compensation data to achieve temperature compensation adjustment within the target reactor includes: The heating temperature T0 is adjusted to the calculated result T0'' of the fitting function to complete the compensation adjustment of the temperature inside the target reactor.

[0015] Secondly, embodiments of this application provide a temperature compensation system for a supercritical extraction reactor, including: The acquisition unit is configured to acquire the optimal pressure and optimal temperature corresponding to the optimal efficiency conditions of the current supercritical extraction process, and to acquire the gas outlet temperature T2 of the target reactor and the heating temperature T0 for heating the outer wall of the target reactor. The calculation unit is configured to input the optimal pressure, the gas outlet temperature T2 and the optimal temperature into a preset temperature compensation model, and receive the output of the temperature compensation model as temperature compensation data. The adjustment unit is configured to adjust the heating temperature T0 according to the temperature compensation data to achieve temperature compensation adjustment inside the target reactor.

[0016] In one possible implementation, the extraction gas is preheated on the outer wall of the target reactor before entering the target reactor, and the extraction gas enters the target reactor at the bottom of the target reactor. The system also includes: The building block is configured as follows: A dynamic simulation test of open-loop temperature regulation at atmospheric pressure was conducted on the target reactor to obtain the external and internal heat transfer parameters of the target reactor. A thermal conductivity simulation model of the target reactor is constructed based on the external heat transfer parameters and the internal heat transfer parameters, and a pressure calculation is performed on the thermal conductivity simulation model to generate calculation results. The temperature compensation model is constructed based on the calculation results.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention relates to a method and system for temperature compensation in a supercritical extraction reactor. Through the above-mentioned technical means, the temperature inside the reactor can be compensated and controlled based on the temperature data collected outside the reactor and a temperature compensation model. This allows the temperature inside the reactor to be controlled relatively stably near the optimal temperature, thereby improving the extraction efficiency inside the reactor. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the reactor structure according to an embodiment of this application; Figure 2 This is a schematic diagram of the method flow of an embodiment of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0020] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] Please refer to the following: Figure 2This is a schematic flowchart of the temperature compensation method inside the supercritical extraction reactor provided in the embodiment of the present invention. Further, the temperature compensation method inside the supercritical extraction reactor may specifically include the contents described in steps S1-S3.

[0022] S1: Obtain the optimal pressure and optimal temperature corresponding to the optimal efficiency conditions of the current supercritical extraction process, and obtain the gas outlet temperature T2 of the target reactor and the heating temperature T0 for heating the outer wall of the target reactor. S2: Input the optimal pressure, the gas outlet temperature T2, and the optimal temperature into a preset temperature compensation model, and receive the output of the temperature compensation model as temperature compensation data; S3: Adjust the heating temperature T0 according to the temperature compensation data to achieve temperature compensation adjustment inside the target reactor.

[0023] In implementing this application's embodiments, during experiments with the supercritical extraction device, the inventors discovered that the main reason why the gas outlet temperature T2 could not accurately characterize the reaction temperature inside the reactor was that the temperature field inside the reactor was a dynamic temperature field, which was difficult to control when affected by external temperature rises and falls and by gas discharge. Based on this, this application's embodiments provide a scheme for compensating the heating temperature using a preset temperature compensation model.

[0024] In this embodiment, supercritical extraction processes typically correspond to optimal extraction temperatures and pressures. The purpose of this embodiment is to control the temperature and pressure within the reactor at their optimal levels to improve extraction efficiency. The gas outlet temperature T2 of the reactor can be detected by installing a temperature sensor at the gas outlet of the reactor's sealed cap, while the heating temperature T0 of the reactor's outer wall can be detected by installing a temperature sensor in the heating medium on the outer wall. Both temperatures are directly obtainable. Based on this data, temperature compensation data can be calculated using a pre-set temperature compensation model, and adjusting T0 with this compensation data will control the temperature within the reactor at the optimal extraction temperature. The temperature compensation model can be a fitted empirical model or a model trained using a neural network. This embodiment, through the above technical means, can compensate and control the temperature within the reactor based on temperature data collected outside the reactor and a temperature compensation model, thereby maintaining a relatively stable temperature within the reactor near the optimal level and improving extraction efficiency.

[0025] In one possible implementation, the gas is preheated on the outer wall of the target reactor before entering it, and the extraction gas enters the target reactor at the bottom.

[0026] When implementing the embodiments of this application, please refer to Figure 1 The diagram shows a schematic of the extraction reactor of an embodiment of this application. The gas entering the target reactor can be in gaseous or liquid form. It needs to be preheated by a pipe wrapped around the outer wall of the target reactor before entering the target reactor from the bottom. At the same time, the pipe and the outer wall of the target reactor are immersed in a heating liquid, the temperature of which is the heating temperature T0. Due to the difficulty of heat transfer experiments and analysis of supercritical substances, the structure of this reactor will be used as the basis for experiments and analysis in subsequent embodiments.

[0027] In one possible implementation, the construction of the temperature compensation model includes: A dynamic simulation test of open-loop temperature regulation at atmospheric pressure was conducted on the target reactor to obtain the external and internal heat transfer parameters of the target reactor. A thermal conductivity simulation model of the target reactor is constructed based on the external heat transfer parameters and the internal heat transfer parameters, and a pressure calculation is performed on the thermal conductivity simulation model to generate calculation results. The temperature compensation model is constructed based on the calculation results.

[0028] In the implementation of this application embodiment, the dynamic simulation test of open-loop temperature regulation at atmospheric pressure refers to a dynamic simulation test of temperature regulation of the target reactor under atmospheric pressure. Since the test is conducted under atmospheric pressure, T1 can be obtained by installing a temperature sensor inside the target reactor. In this application embodiment, the inventors found in the experiment that T1 is mainly affected by two heat transfer methods in the reaction of the target reactor. The first method is the heating of the outer wall of the target reactor and the preheating of the gas before it enters the target reactor; the second method is the removal of heat by the gas after supercritical extraction. Due to the complexity of heat transfer laws under supercritical conditions, in this application embodiment, the heat transfer process of the first method is summarized by external heat transfer parameters, and the heat transfer process of the second method is summarized by internal heat transfer parameters. That is, the external heat transfer parameters characterize the influence of heating the outer wall of the target reactor and the gas preheating; the internal heat transfer parameters characterize the influence of the gas removal after supercritical extraction. For the external heat transfer parameters, they should not change after the target reactor is actually pressurized, while for the internal heat transfer parameters, they will change after the target reactor is actually pressurized. Based on the above principles, a thermal conductivity simulation model of the target reactor can be constructed, and the internal heat transfer parameters can be iteratively updated during the pressurization simulation to achieve simulation of the target reactor under different pressure adjustments, and the simulation results are closer to the actual situation.

[0029] In one possible implementation, a dynamic simulation test of open-loop temperature regulation at atmospheric pressure is conducted on the target reactor to obtain the external and internal heat transfer parameters of the target reactor, including: A dynamic simulation test of open-loop temperature regulation at atmospheric pressure was conducted on the target reactor, and the gas outlet temperature T2', the heating temperature T0' for heating the outer wall of the target reactor, and the reaction temperature T1' inside the target reactor were recorded during the atmospheric pressure test; the pressure inside the target reactor was atmospheric pressure during the dynamic simulation test of open-loop temperature regulation at atmospheric pressure. The gas outlet of the target reactor is sealed, T0' is heated to a constant temperature T and the curve of T0' changing over time is recorded as the first temperature change curve, and the curve of T1' changing over time is recorded as the second temperature change curve. Record the moment when the first temperature change curve reaches a constant temperature T as the first moment, and record the moment when the second temperature change curve reaches a constant temperature T as the second moment; The external heat transfer parameters of the target reactor are calculated based on the difference between the first and second time points, and the difference between the initial temperatures of the isothermal T and the second temperature change curve. Open the gas outlet of the target reactor, keep T0' at a constant temperature T, and record the curve of T2' changing over time as the third temperature change curve; The moment when the third temperature change curve reaches a constant temperature T is recorded as the third moment, and the moment when the gas outlet of the target reactor is opened is recorded as the fourth moment; The internal heat transfer parameters of the target reactor are calculated based on the difference between the fourth and third time points, and the difference between the isothermal temperature T and the initial temperature of the third temperature change curve.

[0030] In implementing this application, a technical solution is provided for obtaining external and internal heat transfer parameters in actual experiments. For external heat transfer parameters, after sealing the gas outlet of the target reactor, the reaction temperature inside the reactor eventually reaches the same temperature as the outer wall of the reactor during the heating process, i.e., a constant temperature T is reached. The external heat transfer parameters can be calculated using the heat transfer time and the initial temperature difference. Similarly, for internal heat transfer parameters, opening the gas outlet of the target reactor generates a third temperature change curve. The internal heat transfer parameters can be calculated using the temperature difference change and heat transfer time of the third temperature change curve. Since the internal heat transfer parameters are inherently uncertain initial parameters, an approximate initial value can be calculated in this way for subsequent numerical simulations.

[0031] In one possible implementation, a thermal conductivity simulation model of the target reactor is constructed based on the external heat transfer parameters and the internal heat transfer parameters, and the simulation model is pressurized to generate calculation results, including: A thermal conductivity simulation model of the target reactor is constructed based on the internal heat transfer parameters and the external heat transfer parameters, and the internal heat transfer parameters are used as the initial parameters for internal heat transfer in the thermal conductivity simulation model. The internal pressure of the reactor in the thermal conductivity simulation model is calculated, and the internal heat transfer parameters are iterated. The gas outlet temperature T2'', the outer wall heating temperature T0'', the reaction temperature T1'', and the pressure N inside the reactor are obtained from multiple sets of pressurization calculation results to form multiple sets of data to be fitted as the calculation results.

[0032] In implementing this application embodiment, when constructing the thermal conductivity simulation model of the target reactor, simulation software with heat transfer analysis capabilities, such as commercial CFD software, can be used for construction. The internal heat transfer parameters are used as initial parameters for internal heat transfer in the thermal conductivity simulation model. During pressurization calculations, a step size is set for the pressure increase, and at each step increase, the internal heat transfer parameters in the model are iteratively calculated until the calculation converges, completing the calculation of the step size change, and recording a set of data to be fitted; multiple sets of data to be fitted can be obtained when multiple step sizes of calculations are completed.

[0033] In one possible implementation, constructing the temperature compensation model based on the calculation results includes: Based on the data to be fitted, T2'', T1'', T0'' and N are fitted to form a fitting function T0''=f(T2'', T1'', N); The fitting function T0''=f(T2'', T1'', N) is used as the temperature compensation model.

[0034] In the implementation of the embodiments of this application, the fitting function T0''=f(T2'', T1'', N) can adopt the polynomial fitting scheme in the prior art, or it can adopt the scheme of performing polynomial fitting on N, T1'' and T2'' and performing polynomial fitting on T0'' and T1'' to form a system of equations.

[0035] In one possible implementation, the optimal pressure, the gas outlet temperature T2, and the optimal temperature are input into a preset temperature compensation model, and the output of the temperature compensation model is received as temperature compensation data, including: The optimal pressure is used as N in the fitting function, the gas outlet temperature T2 is used as T2'' in the fitting function, and the optimal temperature is used as T1'' in the fitting function. The calculation result T0'' of the fitting function is received as temperature compensation data.

[0036] In one possible implementation, adjusting the heating temperature T0 based on the temperature compensation data to achieve temperature compensation adjustment within the target reactor includes: The heating temperature T0 is adjusted to the calculated result T0'' of the fitting function to complete the compensation adjustment of the temperature inside the target reactor.

[0037] Secondly, embodiments of this application provide a temperature compensation system for a supercritical extraction reactor, including: The acquisition unit is configured to acquire the optimal pressure and optimal temperature corresponding to the optimal efficiency conditions of the current supercritical extraction process, and to acquire the gas outlet temperature T2 of the target reactor and the heating temperature T0 for heating the outer wall of the target reactor. The calculation unit is configured to input the optimal pressure, the gas outlet temperature T2 and the optimal temperature into a preset temperature compensation model, and receive the output of the temperature compensation model as temperature compensation data. The adjustment unit is configured to adjust the heating temperature T0 according to the temperature compensation data to achieve temperature compensation adjustment inside the target reactor.

[0038] In one possible implementation, the extraction gas is preheated on the outer wall of the target reactor before entering the target reactor, and the extraction gas enters the target reactor at the bottom of the target reactor. The system also includes: The building block is configured as follows: A dynamic simulation test of open-loop temperature regulation at atmospheric pressure was conducted on the target reactor to obtain the external and internal heat transfer parameters of the target reactor. A thermal conductivity simulation model of the target reactor is constructed based on the external heat transfer parameters and the internal heat transfer parameters, and a pressure calculation is performed on the thermal conductivity simulation model to generate calculation results. The temperature compensation model is constructed based on the calculation results.

[0039] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0040] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, or may be electrical, mechanical or other forms of connection.

[0041] The units described as separate components may or may not be physically separate. As will be apparent to those skilled in the art, the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0042] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0043] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or grid device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0044] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for temperature compensation inside a supercritical extraction reactor, characterized in that, include: Obtain the optimal pressure and optimal temperature corresponding to the optimal efficiency conditions of the current supercritical extraction process, and obtain the gas outlet temperature T2 of the target reactor and the heating temperature T0 for heating the outer wall of the target reactor; The optimal pressure, the gas outlet temperature T2, and the optimal temperature are input into a preset temperature compensation model, and the output of the temperature compensation model is received as temperature compensation data. The heating temperature T0 is adjusted according to the temperature compensation data to achieve temperature compensation adjustment inside the target reactor; The extraction gas is preheated on the outer wall of the target reactor before entering it, and the extraction gas enters the target reactor at the bottom. The construction of the temperature compensation model includes: A dynamic simulation test of open-loop temperature regulation at atmospheric pressure was conducted on the target reactor to obtain the external and internal heat transfer parameters of the target reactor. A thermal conductivity simulation model of the target reactor is constructed based on the external heat transfer parameters and the internal heat transfer parameters, and a pressure calculation is performed on the thermal conductivity simulation model to generate calculation results. The temperature compensation model is constructed based on the calculation results; A dynamic simulation test of open-loop temperature regulation at atmospheric pressure was conducted on the target reactor to obtain its external and internal heat transfer parameters, including: A dynamic simulation test of open-loop temperature regulation at atmospheric pressure was conducted on the target reactor, and the gas outlet temperature T2', the heating temperature T0' for heating the outer wall of the target reactor, and the reaction temperature T1' inside the target reactor were recorded during the atmospheric pressure test; the pressure inside the target reactor was atmospheric pressure during the dynamic simulation test of open-loop temperature regulation at atmospheric pressure. The gas outlet of the target reactor is sealed, T0' is heated to a constant temperature T and the curve of T0' changing over time is recorded as the first temperature change curve, and the curve of T1' changing over time is recorded as the second temperature change curve. Record the moment when the first temperature change curve reaches a constant temperature T as the first moment, and record the moment when the second temperature change curve reaches a constant temperature T as the second moment; The external heat transfer parameters of the target reactor are calculated based on the difference between the first and second time points, and the difference between the initial temperatures of the isothermal T and the second temperature change curve. Open the gas outlet of the target reactor, keep T0' at a constant temperature T, and record the curve of T2' changing over time as the third temperature change curve; The moment when the third temperature change curve reaches a constant temperature T is recorded as the third moment, and the moment when the gas outlet of the target reactor is opened is recorded as the fourth moment; The internal heat transfer parameters of the target reactor are calculated based on the difference between the fourth and third time points, and the difference between the isothermal temperature T and the initial temperature of the third temperature change curve.

2. The method for temperature compensation in a supercritical extraction reactor according to claim 1, characterized in that, A thermal conductivity simulation model of the target reactor is constructed based on the external and internal heat transfer parameters, and the simulation model is pressurized to generate calculation results, including: A thermal conductivity simulation model of the target reactor is constructed based on the internal heat transfer parameters and the external heat transfer parameters, and the internal heat transfer parameters are used as the initial parameters for internal heat transfer in the thermal conductivity simulation model. The internal pressure of the reactor in the thermal conductivity simulation model is calculated, and the internal heat transfer parameters are iterated. The gas outlet temperature T2'', the outer wall heating temperature T0'', the reaction temperature T1'', and the pressure N inside the reactor are obtained from multiple sets of pressurization calculation results to form multiple sets of data to be fitted as the calculation results.

3. The method for temperature compensation in a supercritical extraction reactor according to claim 2, characterized in that, Constructing the temperature compensation model based on the calculation results includes: Based on the data to be fitted, T2'', T1'', T0'' and N are fitted to form a fitting function T0''=f(T2'', T1'', N); The fitting function T0''=f(T2'', T1'', N) is used as the temperature compensation model.

4. The method for temperature compensation inside a supercritical extraction reactor according to claim 3, characterized in that, The optimal pressure, the gas outlet temperature T2, and the optimal temperature are input into a preset temperature compensation model, and the output of the temperature compensation model is received as temperature compensation data, including: The optimal pressure is used as N in the fitting function, the gas outlet temperature T2 is used as T2'' in the fitting function, and the optimal temperature is used as T1'' in the fitting function. The calculation result T0'' of the fitting function is received as temperature compensation data.

5. The method for temperature compensation inside a supercritical extraction reactor according to claim 4, characterized in that, Adjusting the heating temperature T0 based on the temperature compensation data to achieve temperature compensation adjustment inside the target reactor includes: The heating temperature T0 is adjusted to the calculated result T0'' of the fitting function to complete the compensation adjustment of the temperature inside the target reactor.

6. A temperature compensation system for a supercritical extraction reactor using the method described in any one of claims 1 to 5, characterized in that, include: The acquisition unit is configured to acquire the optimal pressure and optimal temperature corresponding to the optimal efficiency conditions of the current supercritical extraction process, and to acquire the gas outlet temperature T2 of the target reactor and the heating temperature T0 for heating the outer wall of the target reactor. The calculation unit is configured to input the optimal pressure, the gas outlet temperature T2, and the optimal temperature into a preset temperature compensation model, and receive the output of the temperature compensation model as temperature compensation data. The adjustment unit is configured to adjust the heating temperature T0 according to the temperature compensation data to achieve temperature compensation adjustment inside the target reactor.

7. The temperature compensation system inside the supercritical extraction reactor according to claim 6, characterized in that, The extraction gas is preheated on the outer wall of the target reactor before entering it, and the extraction gas enters the target reactor at the bottom. The system also includes: The building block is configured as follows: A dynamic simulation test of open-loop temperature regulation at atmospheric pressure was conducted on the target reactor to obtain the external and internal heat transfer parameters of the target reactor. A thermal conductivity simulation model of the target reactor is constructed based on the external heat transfer parameters and the internal heat transfer parameters, and a pressure calculation is performed on the thermal conductivity simulation model to generate calculation results. The temperature compensation model is constructed based on the calculation results.

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