A temperature control method, device, system, storage medium and rectifying column

Abstract

The application discloses a temperature control method, device, system, storage medium and rectifying tower. The method comprises the following steps: monitoring the liquid level change amount of a heat-coupled reboiler during the operation of the rectifying tower; when the liquid level change amount of the heat-coupled reboiler is greater than a preset value, determining a compensation reboiler heat medium flow change amount according to the liquid level change amount of the heat-coupled reboiler, and determining a correction coefficient of the compensation reboiler heat medium flow change amount according to the liquid level change trend of the heat-coupled reboiler; and calculating the set value of a compensation reboiler heat source flow controller according to the compensation reboiler heat medium flow change amount and the correction coefficient, so as to eliminate the temperature change caused by the liquid level change of the heat-coupled reboiler. The application avoids the situation that the low-temperature tower temperature fluctuates greatly due to the temperature regulation lag of the compensation reboiler, and realizes the production stability.

Description

Technical Field

[0001] This application relates to the field of chemical technology, and in particular to a temperature control method, apparatus, system, storage medium, and distillation column. Background Technology

[0002] Thermally coupled distillation is a common energy-saving method in chemical distillation units. Currently, when thermally coupled distillation is used in chemical plants, if the heat provided by the heat source at the top of the high-temperature column is less than the heat required by the reboiler in the low-temperature column, an additional compensating reboiler needs to be added to the bottom of the low-temperature column to compensate for the heat demand of the bottom column using other heat sources. When the operation of the high-temperature column fluctuates, it will cause fluctuations in the heat exchange of the thermally coupled reboiler in the bottom of the low-temperature column. Since the adjustment of the compensating reboiler has a certain lag, it will affect the stability of production.

[0003] Therefore, how to provide a temperature control method to avoid large fluctuations in the temperature of the low-temperature tower due to the lag in the temperature regulation of the reboiler, and to achieve production stability, has become an urgent technical problem to be solved. Summary of the Invention

[0004] This application provides a temperature control method, apparatus, system, storage medium, and distillation column to avoid large fluctuations in the temperature of the low-temperature column due to the lag in the reboiler temperature regulation, thereby achieving production stability.

[0005] This application provides a temperature control method, including:

[0006] A temperature control method, characterized in that it includes:

[0007] During the operation of the distillation column, monitor the liquid level change in the thermally coupled reboiler;

[0008] When the liquid level change of the thermally coupled reboiler is greater than a preset value, the change in the flow rate of the compensating reboiler heat medium is determined based on the liquid level change of the thermally coupled reboiler, and a correction coefficient for the change in the flow rate of the compensating reboiler heat medium is determined based on the liquid level change trend of the thermally coupled reboiler. The correction coefficient for the change in the flow rate of the compensating reboiler heat medium is used to eliminate the temperature fluctuation residual error caused by the liquid level change trend by correcting the change in the flow rate of the compensating reboiler heat medium.

[0009] The set value of the heat source flow controller for the compensating reboiler is calculated based on the change in the flow rate of the heat medium in the compensating reboiler and the correction coefficient, so as to eliminate the temperature change caused by the liquid level change in the thermally coupled reboiler.

[0010] The beneficial effects of this application are as follows: the change in the flow rate of the compensating reboiler heat medium is calculated by measuring the change in the liquid level of the thermally coupled reboiler; then, the product of the change in the flow rate of the compensating reboiler heat medium and the correction coefficient is used as the compensation value to adjust the reboiler. The correction coefficient can be determined based on the trend of liquid level changes, rather than solely on the current liquid level change. Therefore, the value of the correction coefficient can be determined by the trend of liquid level changes, and this correction coefficient participates in the calculation of the reboiler heat compensation value, thereby enabling proactive adjustment of the reboiler heat compensation.

[0011] In one embodiment, determining the amount of compensation for the change in the flow rate of the reboiler heat medium based on the liquid level change of the thermally coupled reboiler includes:

[0012] Substitute the liquid level change in the thermally coupled reboiler into the following formula to calculate the compensation for the change in the reboiler's heat medium flow rate:

[0013] △ FT =3600*k1*3.14*d*d*n*△ LT *L*(Th-Tl) / (4*H);

[0014] Among them, △ FT To compensate for changes in the reboiler's heat transfer fluid flow rate; △ LT denoted as , where is the liquid level change in the thermally coupled reboiler; k1 is the overall heat transfer coefficient of the thermally coupled reboiler; d is the diameter of the heat exchange tubes in the thermally coupled reboiler; n is the number of heat exchange tubes in the thermally coupled reboiler; L is the length of the heat exchange tubes in the thermally coupled reboiler; Th is the operating temperature of the high-temperature tower; Tl is the operating temperature of the low-temperature tower; and H is the latent heat of vaporization of the heating steam.

[0015] In one embodiment, determining the correction coefficient for compensating for changes in the reboiler's heat medium flow rate based on the liquid level change trend of the thermally coupled reboiler includes:

[0016] Determine the difference in liquid level change of the thermally coupled reboiler, wherein the difference in liquid level change is the difference between the liquid level change of the thermally coupled reboiler in the current cycle and the previous cycle;

[0017] The correction coefficient for compensating for the change in the flow rate of the reboiler's heat medium is determined based on the liquid level change in the thermally coupled reboiler and the difference in the liquid level change.

[0018] In one embodiment, determining the correction coefficient for compensating for changes in the reboiler's heat medium flow rate based on the liquid level change in the thermally coupled reboiler and the difference in liquid level change includes:

[0019] The preset correspondence table is queried based on the liquid level change in the thermally coupled reboiler and the difference in the liquid level change.

[0020] The preset correspondence table records a first correspondence between the range of liquid level changes in the thermally coupled reboiler and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium, and a second correspondence between the range of the difference in liquid level changes and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium. A combination of the liquid level change of a thermally coupled reboiler and the difference in liquid level changes jointly determines the value of a correction coefficient for the change in the flow rate of the compensating reboiler's heat medium. The correction coefficient for the change in the flow rate of the compensating reboiler's heat medium is positively correlated with the liquid level change of the thermally coupled reboiler, and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium is positively correlated with the difference in liquid level changes.

[0021] The table is used to query the range of values ​​for the liquid level change in the current thermally coupled reboiler and the correction coefficient for the change in the flow rate of the reboiler's heat medium corresponding to the range of values ​​for the difference in liquid level change.

[0022] This application also provides a distillation column, comprising:

[0023] A thermally coupled reboiler is connected to a high-temperature tower.

[0024] A level transmitter, connected to the thermally coupled reboiler, is used to measure the level of the liquid in the thermally coupled reboiler;

[0025] A computing module is used to execute the temperature control method described in any of the above embodiments.

[0026] In one embodiment, the calculation module is connected to the level transmitter and is used to monitor the level change of the thermally coupled reboiler through the level transmitter. When the level change of the thermally coupled reboiler is greater than a preset value, the module determines the amount of change in the heat medium flow rate of the reboiler to compensate for the change in the heat medium flow rate of the reboiler based on the level change of the thermally coupled reboiler, and determines the correction coefficient of the amount of change in the heat medium flow rate of the reboiler to compensate for the change in the heat medium flow rate of the reboiler based on the level change trend of the thermally coupled reboiler.

[0027] The set value of the heat source flow controller for the compensated reboiler is calculated based on the change in the flow rate of the heat medium in the compensated reboiler and the correction coefficient.

[0028] In one embodiment, the calculation module controls the valve opening of the compensating reboiler heat source flow controller according to the set value of the compensating reboiler heat source flow controller, so that the compensating reboiler heat source flow reaches the set value of the compensating reboiler heat source flow controller calculated based on the change in the compensating reboiler heat medium flow and the correction coefficient.

[0029] This application also provides a temperature control device, including:

[0030] The monitoring module is used to monitor the liquid level change in the thermally coupled reboiler during the operation of the distillation column;

[0031] The determination module is used to determine the change in the flow rate of the compensating reboiler heat medium based on the change in the liquid level of the thermally coupled reboiler when the change in the liquid level of the thermally coupled reboiler is greater than a preset value, and to determine the correction coefficient of the change in the flow rate of the compensating reboiler heat medium based on the trend of the change in the liquid level of the thermally coupled reboiler. The correction coefficient of the change in the flow rate of the compensating reboiler heat medium is used to eliminate the temperature fluctuation residual error caused by the trend of the liquid level change by correcting the change in the flow rate of the compensating reboiler heat medium.

[0032] The calculation module is used to calculate the set value of the heat source flow controller of the compensating reboiler based on the change in the flow rate of the heat medium in the compensating reboiler and the correction coefficient, so as to eliminate the temperature change caused by the liquid level change of the thermally coupled reboiler.

[0033] In one embodiment, the determining module includes:

[0034] Substitute the liquid level change of the thermally coupled reboiler into the following formula to calculate the compensation for the change in the reboiler's thermal medium flow rate:

[0035] △ FT =3600*k1*3.14*d*d*n*△ LT *L*(Th-Tl) / (4*H);

[0036] Among them, △ FT To compensate for changes in the reboiler's heat transfer fluid flow rate; △ LT denoted as , where is the liquid level change in the thermally coupled reboiler; k1 is the overall heat transfer coefficient of the thermally coupled reboiler; d is the diameter of the heat exchange tubes in the thermally coupled reboiler; n is the number of heat exchange tubes in the thermally coupled reboiler; L is the length of the heat exchange tubes in the thermally coupled reboiler; Th is the operating temperature of the high-temperature tower; Tl is the operating temperature of the low-temperature tower; and H is the latent heat of vaporization of the heating steam.

[0037] In one embodiment, the determining module includes:

[0038] The first determining submodule is used to determine the difference in liquid level change of the thermally coupled reboiler, wherein the difference in liquid level change is the difference between the liquid level change of the thermally coupled reboiler in the current cycle and the previous cycle.

[0039] The second determining submodule is used to determine the correction coefficient for compensating the change in the flow rate of the reboiler's heat medium based on the liquid level change in the thermally coupled reboiler and the difference in the liquid level change.

[0040] In one embodiment, the second determining submodule is further configured to:

[0041] The preset correspondence table is queried based on the liquid level change in the thermally coupled reboiler and the difference in the liquid level change.

[0042] The preset correspondence table records a first correspondence between the range of liquid level changes in the thermally coupled reboiler and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium, and a second correspondence between the range of the difference in liquid level changes and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium. A combination of the liquid level change of a thermally coupled reboiler and the difference in liquid level changes jointly determines the value of a correction coefficient for the change in the flow rate of the compensating reboiler's heat medium. The correction coefficient for the change in the flow rate of the compensating reboiler's heat medium is positively correlated with the liquid level change of the thermally coupled reboiler, and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium is positively correlated with the difference in liquid level changes.

[0043] The table is used to query the range of values ​​for the liquid level change in the current thermally coupled reboiler and the correction coefficient for the change in the flow rate of the reboiler's heat medium corresponding to the range of values ​​for the difference in liquid level change.

[0044] This application also provides a temperature control system, including:

[0045] At least one processor; and,

[0046] A memory communicatively connected to the at least one processor; wherein,

[0047] The memory stores instructions that can be executed by the at least one processor to implement the temperature control method described in any of the above embodiments.

[0048] This application also provides a computer-readable storage medium that, when the instructions in the storage medium are executed by a processor corresponding to the temperature control system, enables the temperature control system to implement the temperature control method described in any of the above embodiments.

[0049] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0050] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0051] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the embodiments of the present application to explain the application and do not constitute a limitation thereof. In the drawings:

[0052] Figure 1This is a flowchart of a temperature control method according to an embodiment of this application;

[0053] Figure 2 This is a schematic diagram of the structure of a distillation column according to one embodiment of this application;

[0054] Figure 3 This is a schematic diagram of the structure of a temperature control device according to an embodiment of this application;

[0055] Figure 4 This is a schematic diagram of the hardware structure of a temperature control system according to one embodiment of this application.

[0056] Explanation of reference numerals in the attached figures:

[0057] 201—Thermal-coupled reboiler; 202—Level transmitter; 203—Computing module. Detailed Implementation

[0058] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0059] Current technology typically uses a single-loop temperature transmitter (TT) to measure the temperature of the cryogenic column and transmits the signal to a temperature controller (TIC), which then outputs a signal to a flow controller (FIC01) to control the temperature of the cryogenic column. By measuring the reboiler temperature in real time, if there is a deviation between the measured reboiler temperature and the setpoint, the setpoint of the FIC is adjusted via the TIC to regulate the flow rate of the heating medium, thereby changing the reboiler temperature back to the setpoint. This control method only adjusts the heating medium after the cryogenic column temperature changes, resulting in significant lag and unstable temperature fluctuations in the cryogenic column.

[0060] This application adds a level transmitter LT to the thermally coupled reboiler. When fluctuations occur in the high-temperature column, the pressure control valve PV1 is activated, altering the liquid level in the thermally coupled reboiler and affecting the operational stability of the low-temperature column. By adding the level transmitter LT, this application measures the liquid level fluctuations before temperature changes and transmits this signal to the calculation module. The calculation module predicts the magnitude and future trend of changes in the heat exchange capacity of the thermally coupled reboiler by analyzing the amount of liquid level change within a sampling period and the rate of change in liquid level within adjacent sampling periods. After calculation, the output signal is sent to the flow controller FIC01 to change the heating medium flow rate. This advance adjustment of the heating medium flow rate to compensate for the reboiler avoids the lag in adjusting the heating medium after fluctuations in temperature (TT).

[0061] Figure 1 This is a flowchart of a temperature control method according to an embodiment of this application, such as... Figure 1As shown, the method can be implemented as follows: S101-S103:

[0062] In step S101, during the operation of the distillation column, the liquid level change in the thermally coupled reboiler is monitored;

[0063] In step S102, when the liquid level change of the thermally coupled reboiler is greater than a preset value, the change in the flow rate of the compensating reboiler heat medium is determined based on the liquid level change of the thermally coupled reboiler, and a correction coefficient for the change in the flow rate of the compensating reboiler heat medium is determined based on the liquid level change trend of the thermally coupled reboiler. The correction coefficient for the change in the flow rate of the compensating reboiler heat medium is used to eliminate the temperature fluctuation residual error caused by the liquid level change trend by correcting the change in the flow rate of the compensating reboiler heat medium.

[0064] In step S103, the set value of the heat source flow controller of the compensating reboiler is calculated based on the change in the flow rate of the heat medium of the compensating reboiler and the correction coefficient, so as to eliminate the temperature change caused by the liquid level change of the thermally coupled reboiler.

[0065] Thermally coupled distillation column control allows steam from one column to be used as a heat source for the next column when multiple distillation columns are operated in series, so that heat can be recovered and utilized. Figure 2 This is a schematic diagram of the structure of a distillation column according to one embodiment of this application, as shown below. Figure 2 As shown, the vapor phase at the top of the high-temperature column is used for heating in the thermally coupled reboiler 201 of the low-temperature column, while the temperature of the distillation column is balanced by the thermally compensated reboiler. Because the temperature change in the low-temperature column lags behind temperature fluctuations in the high-temperature column, this results in a certain lag in the adjustment of the compensating reboiler, affecting production stability. To avoid large fluctuations in the temperature of the low-temperature column, this application monitors the liquid level change in the thermally coupled reboiler during the operation of the distillation column, specifically through a liquid level transmitter 202 (i.e., Figure 2 The LT module monitors the liquid level change in the thermocouple reboiler in real time and transmits the liquid level measurement value to the calculation module 203 (i.e., Figure 2 (Chinese CAL).

[0066] When the liquid level change in the thermally coupled reboiler exceeds a preset value, the compensation for the reboiler's heat transfer medium flow rate change is determined based on the liquid level change, and a correction coefficient for the compensation for the reboiler's heat transfer medium flow rate change is determined based on the liquid level change trend. This correction coefficient is used to correct the compensation for the reboiler's heat transfer medium flow rate change, thereby eliminating the temperature fluctuation error caused by the liquid level change trend. Specifically, when the liquid level change in the thermally coupled reboiler exceeds the preset value, it indicates that the liquid level fluctuation within the reboiler exceeds the normal fluctuation range, which will cause significant fluctuations in the temperature of the cryogenic tower. The preset value can be an empirical value or a value determined based on historical data, such as the average liquid level value causing temperature fluctuations in the cryogenic tower. Then, the calculation module determines the compensation for the reboiler's heat transfer medium flow rate change and the correction coefficient by analyzing the liquid level change within the sampling period and the rate of change of the liquid level within adjacent sampling periods.

[0067] (1) Determine the change in the flow rate of the compensating reboiler heat medium based on the change in the liquid level of the thermally coupled reboiler. For example, the change in the liquid level of the thermally coupled reboiler can be substituted into the following formula to calculate the change in the flow rate of the compensating reboiler heat medium:

[0068] △ FT =3600*k1*3.14*d*d*n*△ LT *L*(Th-Tl) / (4*H);

[0069] Among them, △ FT To compensate for changes in the reboiler's heat transfer fluid flow rate; △ LT denoted as , where is the liquid level change in the thermally coupled reboiler; k1 is the overall heat transfer coefficient of the thermally coupled reboiler, which is determined from the design conditions of the thermally coupled reboiler; d is the diameter of the heat exchange tubes in the thermally coupled reboiler; n is the number of heat exchange tubes in the thermally coupled reboiler; L is the length of the heat exchange tubes in the thermally coupled reboiler; Th is the operating temperature of the high-temperature tower; Tl is the operating temperature of the low-temperature tower; and H is the latent heat of vaporization of the heating steam, determined by the heating steam.

[0070] Of course, historical operating data can also be collected, and data fitting or neural network models can be used to establish a model relating the aforementioned parameters (such as the overall heat transfer coefficient of the thermally coupled reboiler, the diameter of the heat exchange tubes in the thermally coupled reboiler, the number of heat exchange tubes in the thermally coupled reboiler, the length of the heat exchange tubes in the thermally coupled reboiler, the operating temperature of the high-temperature tower, the operating temperature of the low-temperature tower, the latent heat of vaporization of the heating steam, etc.) to the liquid level change in the thermally coupled reboiler. This allows for the determination of the amount of change in the heat medium flow rate of the reboiler that needs to be adjusted. This application will not elaborate on this aspect.

[0071] (2) Determine the correction coefficient for compensating the change in the flow rate of the hot medium in the reboiler based on the liquid level change trend of the thermally coupled reboiler.

[0072] To further ensure the stability of the cryogenic tower temperature, this application also monitors the liquid level change trend of the thermally coupled reboiler, i.e., the change in the liquid level of the thermally coupled reboiler, in order to correct the change in the flow rate of the compensating reboiler's heat medium based on the liquid level change trend of the thermally coupled reboiler. Specifically, the difference in the liquid level change of the thermally coupled reboiler is determined, wherein the difference in the liquid level change is the difference between the liquid level change of the thermally coupled reboiler in the current cycle and the previous cycle; then, a correction coefficient for the change in the flow rate of the compensating reboiler's heat medium is determined together with the liquid level change of the thermally coupled reboiler and the difference in the liquid level change. To determine the correction coefficient, a model of the relationship between the liquid level change of the thermally coupled reboiler, the difference in the liquid level change, and the correction coefficient can be established by using a simulation model or by constructing a deep learning model using historical data. To improve control efficiency, this application pre-stores the correction coefficients corresponding to the liquid level change and the difference in liquid level change of the thermally coupled reboiler in a preset correspondence table. Table 1 is a preset correspondence table of correction coefficients in one embodiment of this application. As shown in Table 1, the preset correspondence table records a first correspondence between the range of liquid level change of the thermally coupled reboiler and the correction coefficient for the change in the flow rate of the compensating reboiler's hot medium, and a second correspondence between the range of the difference in liquid level change and the correction coefficient for the change in the flow rate of the compensating reboiler's hot medium. The combination of a liquid level change and a difference in liquid level change of the thermally coupled reboiler jointly determines the value of a correction coefficient for the change in the flow rate of the compensating reboiler's hot medium. The correction coefficient for the change in the flow rate of the compensating reboiler's hot medium is positively correlated with the liquid level change of the thermally coupled reboiler, and the correction coefficient for the change in the flow rate of the compensating reboiler's hot medium is positively correlated with the difference in liquid level change. Then, based on the liquid level change of the thermally coupled reboiler and the difference in liquid level change, a preset correspondence table is queried; from the preset correspondence table, the value range of the current liquid level change of the thermally coupled reboiler and the correction coefficient for the change in the flow rate of the compensating reboiler heat medium corresponding to the value range of the difference in liquid level change are queried.

[0073] Table 1 Preset Correspondence Table

[0074]

[0075] Among them, △ LT Δ represents the liquid level change in the thermally coupled reboiler. LT =LT 取样周期结束 -LT 取样周期开始 ;△′ LT Δ′ represents the difference in liquid level change in the thermally coupled reboiler. LT =△ LT，本次取样周期 -△ LT，上一取样周期 .

[0076] The setpoint of the reboiler heat source flow controller is calculated based on the change in the reboiler heat medium flow rate and the correction coefficient to eliminate temperature changes caused by liquid level variations in the thermally coupled reboiler. Specifically, the change in the reboiler heat medium flow rate and the correction coefficient are substituted into the following formula to determine the setpoint of the reboiler heat source flow controller:

[0077] FIC01 setup new =FIC01 setup old +△ FT *k2 (2)

[0078] Among them, FIC01 setup new To compensate for the new setpoint of the reboiler heat source flow controller, FIC01 setupold To compensate for the original setting of the reboiler heat source flow controller, △ FT To compensate for the change in the flow rate of the reboiler's hot medium, k2 is the correction coefficient for compensating for the change in the flow rate of the reboiler's hot medium.

[0079] Furthermore, the temperature control strategy provided in this application can identify the deviation and rate of change of the submerged liquid level fluctuation in the thermally coupled reboiler. Based on the empirical model and the correction coefficient matrix, different correction coefficients can be selected to proactively adjust and compensate for the flow rate of the heating medium in the reboiler, thereby maintaining the stable operation of the distillation column.

[0080] The beneficial effects of this application are as follows: the change in the flow rate of the compensating reboiler heat medium is calculated by measuring the change in the liquid level of the thermally coupled reboiler; then, the product of the change in the flow rate of the compensating reboiler heat medium and the correction coefficient is used as the compensation value to adjust the reboiler. The correction coefficient can be determined based on the trend of liquid level changes, rather than solely on the current liquid level change. Therefore, the value of the correction coefficient can be determined by the trend of liquid level changes, and this correction coefficient participates in the calculation of the reboiler heat compensation value, thereby enabling proactive adjustment of the reboiler heat compensation.

[0081] In one embodiment, the step S102 above, which involves determining the amount of compensation for the change in the flow rate of the reboiler's thermal medium based on the liquid level change of the thermally coupled reboiler, can be implemented as follows:

[0082] Substitute the liquid level change in the thermally coupled reboiler into the following formula to calculate the compensation for the change in the reboiler's heat medium flow rate:

[0083] △ FT =3600*k1*3.14*d*d*n*△ LT *L*(Th-Tl) / (4*H);

[0084] Among them, △ FT To compensate for changes in the reboiler's heat transfer fluid flow rate; △ LTdenoted as , where is the liquid level change in the thermally coupled reboiler; k1 is the overall heat transfer coefficient of the thermally coupled reboiler; d is the diameter of the heat exchange tubes in the thermally coupled reboiler; n is the number of heat exchange tubes in the thermally coupled reboiler; L is the length of the heat exchange tubes in the thermally coupled reboiler; Th is the operating temperature of the high-temperature tower; Tl is the operating temperature of the low-temperature tower; and H is the latent heat of vaporization of the heating steam.

[0085] In one embodiment, the determination of the correction coefficient for compensating the change in the flow rate of the reboiler heat medium based on the liquid level change trend of the thermally coupled reboiler in step S102 above can be implemented as follows: steps B1-B2:

[0086] In step B1, the difference in liquid level change of the thermally coupled reboiler is determined, wherein the difference in liquid level change is the difference between the liquid level change of the thermally coupled reboiler in the current cycle and the previous cycle.

[0087] In step B2, a correction coefficient for compensating for the change in the flow rate of the reboiler's thermal medium is determined based on the liquid level change in the thermally coupled reboiler and the difference in the liquid level change.

[0088] In one embodiment, step B2 above can be implemented as steps B21-B22:

[0089] In step B21, a preset correspondence table is queried based on the liquid level change of the thermally coupled reboiler and the difference in the liquid level change.

[0090] The preset correspondence table records a first correspondence between the range of liquid level changes in the thermally coupled reboiler and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium, and a second correspondence between the range of the difference in liquid level changes and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium. A combination of the liquid level change of a thermally coupled reboiler and the difference in liquid level changes jointly determines the value of a correction coefficient for the change in the flow rate of the compensating reboiler's heat medium. The correction coefficient for the change in the flow rate of the compensating reboiler's heat medium is positively correlated with the liquid level change of the thermally coupled reboiler, and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium is positively correlated with the difference in liquid level changes.

[0091] In step B22, the correction coefficient for the change in the heat medium flow rate of the current thermally coupled reboiler is queried from the preset correspondence table, which corresponds to the range of values ​​of the liquid level change and the range of values ​​of the difference in liquid level change.

[0092] Figure 2 This is a schematic diagram of the structure of a distillation column according to an embodiment of the present application, including:

[0093] Thermally coupled reboiler 201 is connected to the high-temperature tower;

[0094] A level transmitter 202 is connected to the thermally coupled reboiler and is used to measure the liquid level in the thermally coupled reboiler.

[0095] The computing module 203 is used to execute the temperature control method described in any of the above embodiments.

[0096] In one embodiment, the calculation module is connected to the level transmitter and is used to monitor the level change of the thermally coupled reboiler through the level transmitter. When the level change of the thermally coupled reboiler is greater than a preset value, the module determines the amount of change in the heat medium flow rate of the reboiler to compensate for the change in the heat medium flow rate of the reboiler based on the level change of the thermally coupled reboiler, and determines the correction coefficient of the amount of change in the heat medium flow rate of the reboiler to compensate for the change in the heat medium flow rate of the reboiler based on the level change trend of the thermally coupled reboiler.

[0097] The set value of the heat source flow controller for the compensated reboiler is calculated based on the change in the flow rate of the heat medium in the compensated reboiler and the correction coefficient.

[0098] In one embodiment, the calculation module controls the valve opening of the compensating reboiler heat source flow controller according to the set value of the compensating reboiler heat source flow controller, so that the compensating reboiler heat source flow reaches the set value of the compensating reboiler heat source flow controller calculated based on the change in the compensating reboiler heat medium flow and the correction coefficient.

[0099] Figure 3 This is a schematic diagram of the structure of a temperature control device according to an embodiment of the present application, including:

[0100] Monitoring module 301 is used to monitor the liquid level change of the thermally coupled reboiler during the operation of the distillation column;

[0101] The determining module 302 is used to determine the amount of change in the heat-coupled reboiler heat medium flow rate to compensate for the change in the heat-coupled reboiler heat medium flow rate when the change in the liquid level of the heat-coupled reboiler is greater than a preset value, and to determine the correction coefficient of the amount of change in the heat-coupled reboiler heat medium flow rate to compensate for the change in the liquid level of the heat-coupled reboiler heat medium flow rate to compensate for the change in the heat-coupled reboiler heat medium flow rate to eliminate the temperature fluctuation residual error caused by the liquid level change trend.

[0102] The calculation module 303 is used to calculate the set value of the heat source flow controller of the compensating reboiler based on the change in the flow rate of the heat medium of the compensating reboiler and the correction coefficient, so as to eliminate the temperature change caused by the liquid level change of the thermally coupled reboiler.

[0103] In one embodiment, the determining module includes:

[0104] Substitute the liquid level change of the thermally coupled reboiler into the following formula to calculate the compensation for the change in the reboiler's thermal medium flow rate:

[0105] △ FT =3600*k1*3.14*d*d*n*△ LT *L*(Th-Tl) / (4*H);

[0106] Among them, △ FT To compensate for changes in the reboiler's heat transfer fluid flow rate; △ LT denoted as , where is the liquid level change in the thermally coupled reboiler; k1 is the overall heat transfer coefficient of the thermally coupled reboiler; d is the diameter of the heat exchange tubes in the thermally coupled reboiler; n is the number of heat exchange tubes in the thermally coupled reboiler; L is the length of the heat exchange tubes in the thermally coupled reboiler; Th is the operating temperature of the high-temperature tower; Tl is the operating temperature of the low-temperature tower; and H is the latent heat of vaporization of the heating steam.

[0107] In one embodiment, the determining module includes:

[0108] The first determining submodule is used to determine the difference in liquid level change of the thermally coupled reboiler, wherein the difference in liquid level change is the difference between the liquid level change of the thermally coupled reboiler in the current cycle and the previous cycle.

[0109] The second determining submodule is used to determine the correction coefficient for compensating the change in the flow rate of the reboiler's heat medium based on the liquid level change in the thermally coupled reboiler and the difference in the liquid level change.

[0110] In one embodiment, the second determining submodule is further configured to:

[0111] The preset correspondence table is queried based on the liquid level change in the thermally coupled reboiler and the difference in the liquid level change.

[0112] The preset correspondence table records a first correspondence between the range of liquid level changes in the thermally coupled reboiler and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium, and a second correspondence between the range of the difference in liquid level changes and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium. A combination of the liquid level change of a thermally coupled reboiler and the difference in liquid level changes jointly determines the value of a correction coefficient for the change in the flow rate of the compensating reboiler's heat medium. The correction coefficient for the change in the flow rate of the compensating reboiler's heat medium is positively correlated with the liquid level change of the thermally coupled reboiler, and the correction coefficient for the change in the flow rate of the compensating reboiler's heat medium is positively correlated with the difference in liquid level changes.

[0113] The table is used to query the range of values ​​for the liquid level change in the current thermally coupled reboiler and the correction coefficient for the change in the flow rate of the reboiler's heat medium corresponding to the range of values ​​for the difference in liquid level change.

[0114] Figure 4This is a schematic diagram of the hardware structure of a temperature control system according to one embodiment of this application, as shown below. Figure 4 As shown, the temperature control system includes:

[0115] At least one processor 420; and,

[0116] Memory 404 communicatively connected to the at least one processor 420; wherein,

[0117] The memory 404 stores instructions that can be executed by the at least one processor 420 to implement the temperature control method described in any of the above embodiments.

[0118] Reference Figure 4 The temperature control system 400 may include one or more of the following components: a processing component 402, a memory 404, a power supply component 406, a multimedia component 408, an audio component 410, an input / output (I / O) interface 412, a sensor component 414, and a communication component 416.

[0119] Processing component 402 typically controls the overall operation of temperature control system 400. Processing component 402 may include one or more processors 420 to execute instructions to complete all or part of the steps of the method described above. Furthermore, processing component 402 may include one or more modules to facilitate interaction between processing component 402 and other components. For example, processing component 402 may include a multimedia module to facilitate interaction between multimedia component 408 and processing component 402.

[0120] Memory 404 is configured to store various types of data to support the operation of temperature control system 400. Examples of this data include instructions for any application or method operating on temperature control system 400, such as text, images, videos, etc. Memory 404 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0121] Power supply assembly 406 provides power to various components of temperature control system 400. Power supply assembly 406 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to temperature control system 400.

[0122] The multimedia component 408 includes a screen that provides an output interface between the temperature control system 400 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of touch or swipe actions but also the duration and pressure associated with the touch or swipe operation. In some embodiments, the multimedia component 408 may also include a front-facing camera and / or a rear-facing camera. When the temperature control system 400 is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0123] Audio component 410 is configured to output and / or input audio signals. For example, audio component 410 includes a microphone (MIC) configured to receive external audio signals when the temperature control system 400 is in an operating mode, such as alarm mode, recording mode, voice recognition mode, and voice output mode. The received audio signals may be further stored in memory 404 or transmitted via communication component 416. In some embodiments, audio component 410 also includes a speaker for outputting audio signals.

[0124] I / O interface 412 provides an interface between processing component 402 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0125] Sensor assembly 414 includes one or more sensors for providing status assessments of various aspects of the temperature control system 400. For example, sensor assembly 414 may include a sound sensor. Additionally, sensor assembly 414 may detect the on / off state of the temperature control system 400, the relative positioning of components (e.g., the display and keypad of the temperature control system 400), the operating status of the temperature control system 400 or a component of the temperature control system 400, the orientation or acceleration / deceleration of the temperature control system 400, and temperature changes of the temperature control system 400. Sensor assembly 414 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 414 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 414 may also be a pressure sensor or a temperature sensor.

[0126] Communication component 416 is configured to enable temperature control system 400 to provide wired or wireless communication capabilities with other devices and cloud platforms. Temperature control system 400 can access wireless networks based on communication standards, such as WiFi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 416 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 416 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0127] In an exemplary embodiment, the temperature control system 400 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the temperature control method described in any of the above embodiments.

[0128] This application also provides a computer-readable storage medium that, when the instructions in the storage medium are executed by a processor corresponding to the temperature control system, enables the temperature control system to implement the temperature control method described in any of the above embodiments.

[0129] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0130] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0131] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0132] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0133] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A temperature control method characterized by, The application relates to a temperature control method for a heat-coupled reboiler of a distillation column. During operation of the distillation column, the liquid level change amount of the heat-coupled reboiler is monitored; when the liquid level change amount of the heat-coupled reboiler is greater than a preset value, the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler, wherein the correction coefficient of the compensation reboiler heat medium flow change amount is used to correct the compensation reboiler heat medium flow change amount, so as to eliminate the temperature fluctuation residual error caused by the liquid level change trend; the set value of the compensation reboiler heat source flow controller is calculated according to the compensation reboiler heat medium flow change amount and the correction coefficient, so as to eliminate the temperature change caused by the liquid level change of the heat-coupled reboiler.

2. The method of claim 1, wherein, The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The liquid level change amount difference value of the heat-coupled reboiler is determined, wherein the liquid level change amount difference value is the difference value between the current period and the last period of the liquid level change amount of the heat-coupled reboiler; The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value.

3. The method of claim 2, wherein, The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler.

4. A rectification column, characterized by The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler.

5. The rectification column of claim 4, wherein The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler. The correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change amount of the heat-coupled reboiler and the liquid level change amount difference value, and the correction coefficient of the compensation reboiler heat medium flow change amount is determined according to the liquid level change trend of the heat-coupled reboiler The set value of the heat source flow controller of the compensation reboiler is calculated according to the compensation reboiler heat medium flow variation and the correction coefficient.

6. The rectification column of claim 4, wherein The calculation module controls the valve opening degree of the heat source flow controller of the compensation reboiler according to the set value of the heat source flow controller of the compensation reboiler, so that the heat source flow of the compensation reboiler reaches the set value of the heat source flow controller of the compensation reboiler calculated according to the compensation reboiler heat medium flow variation and the correction coefficient.

7. A temperature control device, characterized by The method comprises the steps of: The monitoring module is configured to monitor the liquid level variation of the heat-coupled reboiler during operation of the rectification tower. The determining module is configured to determine the compensation reboiler heat medium flow variation according to the liquid level variation of the heat-coupled reboiler when the liquid level variation of the heat-coupled reboiler is greater than a preset value, and determine a correction coefficient of the compensation reboiler heat medium flow variation according to the liquid level variation trend of the heat-coupled reboiler, wherein the correction coefficient of the compensation reboiler heat medium flow variation is used to correct the compensation reboiler heat medium flow variation to eliminate the temperature fluctuation residual error caused by the liquid level variation trend. The calculation module is configured to calculate the set value of the heat source flow controller of the compensation reboiler according to the compensation reboiler heat medium flow variation and the correction coefficient to eliminate the temperature variation caused by the liquid level variation of the heat-coupled reboiler.

8. A temperature control system characterized by, The method comprises the steps of: At least one processor; And The memory is in communication connection with the at least one processor; wherein The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the temperature control method according to any one of claims 1-3.

9. A computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the processor corresponding to the temperature control system, the temperature control system can implement the temperature control method according to any one of claims 1-3.

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