A feed amount control method, device, system and storage medium

Abstract

The application discloses a feed quantity control method, device, system and storage medium. The method comprises the following steps: obtaining preset parameters of a rectifying tower during operation of the rectifying tower; judging whether the feed quantity of the rectifying tower exceeds the maximum processing capacity of the rectifying tower according to the preset parameters of the rectifying tower; when the feed quantity of the rectifying tower exceeds the maximum processing capacity of the rectifying tower, reducing the output value of a corresponding valve position controller through a component for obtaining the preset parameters, so that the output value of the valve position controller is selected by a low selection controller; and transmitting the output value of the valve position controller to a feed flow controller through the low selection controller, so that the feed flow controller reduces the feed quantity according to the output value of the valve position controller. According to the scheme, the feed quantity can be automatically controlled by automatically adjusting the feed quantity according to the actual load of the rectifying tower, and the waste of resources or dangerous situations in the rectifying process are avoided.

Description

Technical Field

[0001] This application relates to the field of distillation technology, and in particular to a method, apparatus, system and storage medium for controlling feed rate. Background Technology

[0002] In existing technology, the reboiler of a distillation column uses S2 steam as a heat source. During distillation, the vapor phase separated at the top of the column enters an air cooler for condensation. After condensation, the condensate enters a condensate tank. Part of the condensate in the condensate tank is returned to the distillation column as reflux, and the other part is sent downstream for further processing as product. The heavy components in the reboiler remain at the bottom of the distillation column and are sent to the incineration system for treatment. Currently, the distillation system controls the feed rate of S2 steam through a cascaded temperature control plate within the column; and controls the fan frequency of the air cooler through column pressure. In addition, to maintain a stable condensate level in the condensate tank, the condensate outflow rate is controlled by a cascaded level control system; and to maintain a stable heavy component level in the reboiler, the outflow rate of the heavy component waste liquid from the reboiler is controlled by a cascaded level control system.

[0003] However, during distillation, when changes in the system feed rate or feed composition lead to an increase in system load, adjusting the cooling capacity solely by controlling the top pressure and the heating capacity by controlling the bottom temperature may result in insufficient condensation or heating separation capabilities, leading to dangerous situations such as overfilling / overpressure in the distillation column or incomplete separation and wasted feed. Therefore, providing a feed rate control method that allows the distillation column to automatically adjust the feed rate according to the actual load, thus avoiding resource waste or dangerous situations during distillation, has become an urgent technical problem to be solved. Summary of the Invention

[0004] This application provides a method, apparatus, system, and storage medium for controlling the feed rate, which automatically adjusts and controls the feed rate according to the actual load of the distillation column to avoid resource waste or dangerous situations during the distillation process.

[0005] This application provides a method for controlling the feed rate, including:

[0006] During the operation of the distillation column, the preset parameters of the distillation column are obtained;

[0007] Determine whether the feed rate of the distillation column exceeds its maximum processing capacity based on the preset parameters of the distillation column.

[0008] When the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column, the corresponding valve position controller output value is reduced by the component that obtains the preset parameters, so that the valve position controller output value is selected by the low selection controller. The low selection controller is used to select the minimum value from the output values ​​of the valve position controller and the manual controller, and transmit the minimum value to the feed flow controller.

[0009] The low-selection controller transmits the output value of the valve position controller to the feed flow controller, so that the feed flow controller reduces the feed rate according to the output value of the valve position controller.

[0010] The beneficial effects of this application are as follows: By setting corresponding valve position controllers for multiple components of the distillation system, preset parameters of the distillation column are acquired during its operation, and the feed rate is determined based on these preset parameters to determine whether it exceeds the maximum processing capacity of the distillation column. When the feed rate exceeds the maximum processing capacity, the corresponding valve position controller output value is reduced by the component used to acquire the preset parameters, so that the valve position controller output value is selected by a low-selection controller. The low-selection controller selects the minimum value from the output values ​​of the valve position controller and the manual controller, and transmits the minimum value to the feed flow controller. The low-selection controller then transmits the valve position controller output value to the feed flow controller, so that the feed flow controller reduces the feed rate based on the valve position controller output value. Therefore, when the feed rate exceeds the maximum processing capacity of the distillation column, the system feed rate is reduced according to the corresponding preset parameters, achieving automatic adjustment and control of the feed rate based on the actual load of the distillation column, thus avoiding resource waste or dangerous situations during the distillation process.

[0011] In one embodiment, obtaining the preset parameters of the distillation column includes:

[0012] The temperature measurement value of the distillation column is obtained through a temperature controller;

[0013] The step of determining whether the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column based on the preset parameters of the distillation column includes:

[0014] When the temperature measurement of the distillation column decreases, it is determined that the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column.

[0015] In one embodiment, the step of controlling the corresponding valve position controller output value to decrease by acquiring the preset parameter, so that the valve position controller output value is selected by the low-select controller, includes:

[0016] The temperature controller controls the measurement value of the first valve position controller connected to the steam regulating valve to increase, thereby causing the output value of the first valve position controller to decrease under the reaction, so that the output value of the first valve position controller is selected by the low selection controller.

[0017] In one embodiment, the measurement value of the first valve position controller connected to the steam regulating valve is increased by controlling the temperature controller, thereby causing the output value of the first valve position controller to decrease under the reaction, including:

[0018] The output value of the temperature controller is transmitted to the steam flow controller to increase the set value of the steam flow controller, thereby increasing the opening of the steam regulating valve. When the measured value of the temperature controller decreases, the output value of the temperature controller increases under the reaction. The steam flow controller uses the output value of the temperature controller as its own set value. When the opening of the steam regulating valve increases, the measured value of the valve position controller connected to the steam regulating valve also increases.

[0019] When the measured value of the first valve position controller connected to the steam regulating valve increases, the output value of the first valve position controller decreases under the reaction, so that the output value of the first valve position controller is lower than the output value of the second valve position controller and lower than the output value of the manual controller, so that the output value of the first valve position controller is selected by the low selection controller.

[0020] In one embodiment, obtaining the preset parameters of the distillation column includes:

[0021] The pressure measurement value of the distillation column is obtained through a pressure controller;

[0022] The step of determining whether the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column based on the preset parameters of the distillation column includes:

[0023] When the pressure measurement value of the distillation column increases, it is determined that the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column.

[0024] In one embodiment, the step of controlling the corresponding valve position controller output value to decrease by acquiring the preset parameter, so that the valve position controller output value is selected by the low-select controller, includes:

[0025] When the pressure measurement value of the distillation column increases, the pressure controller controls the measurement value of the second valve position controller to increase, thereby causing the output value of the second valve position controller to decrease under the reaction, so that the output value of the second valve position controller is selected by the low selection controller, and the low selection controller uses the selected value as the feed rate of the distillation column.

[0026] In one embodiment, when the pressure measurement value of the distillation column increases, the pressure controller controls the measurement value of the second valve position controller to increase, thereby causing the output value of the second valve position controller to decrease under the reaction, so that the output value of the second valve position controller is selected by the low-select controller, including:

[0027] When the pressure measurement value of the distillation column increases, the output value of the pressure controller increases under positive action;

[0028] The increased pressure controller output value is transmitted to the second valve position controller, so that the measured value of the second valve position controller increases;

[0029] The output value of the second valve position controller decreases under the reaction, making the output value of the second valve position controller lower than the output value of the first valve position controller and lower than the output value of the manual controller, so that the output value of the second valve position controller is selected by the low selection controller.

[0030] This application also provides a feed rate control device, including:

[0031] The acquisition module is used to acquire the preset parameters of the distillation column during its operation.

[0032] The judgment module is used to determine whether the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column based on the preset parameters of the distillation column.

[0033] The control module is used to control the output value of the corresponding valve position controller to decrease when the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column by acquiring the preset parameters, so that the output value of the valve position controller is selected by the low selection controller. The low selection controller is used to select the minimum value from the output values ​​of the valve position controller and the manual controller, and transmit the minimum value to the feed flow controller.

[0034] The reduction module is used to transmit the output value of the valve position controller to the feed flow controller through the low selection controller, so that the feed flow controller reduces the feed rate according to the output value of the valve position controller.

[0035] In one embodiment, the acquisition module includes:

[0036] The first acquisition submodule is used to acquire the temperature measurement value of the distillation column through the temperature controller;

[0037] The judgment module includes:

[0038] The first determining submodule is used to determine that the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column when the temperature measurement value of the distillation column decreases.

[0039] In one embodiment, the control module includes:

[0040] The first control submodule is used to increase the measured value of the first valve position controller connected to the steam regulating valve through the temperature controller, thereby causing the output value of the first valve position controller to decrease under the reaction, so that the output value of the first valve position controller is selected by the low selection controller.

[0041] In one embodiment, the first control submodule is further configured to:

[0042] The output value of the temperature controller is transmitted to the steam flow controller to increase the set value of the steam flow controller, thereby increasing the opening of the steam regulating valve. When the measured value of the temperature controller decreases, the output value of the temperature controller increases under the reaction. The steam flow controller uses the output value of the temperature controller as its own set value. When the opening of the steam regulating valve increases, the measured value of the valve position controller connected to the steam regulating valve also increases.

[0043] When the measured value of the first valve position controller connected to the steam regulating valve increases, the output value of the first valve position controller decreases under the reaction, so that the output value of the first valve position controller is lower than the output value of the second valve position controller and lower than the output value of the manual controller, so that the output value of the first valve position controller is selected by the low selection controller.

[0044] In one embodiment, the acquisition module includes:

[0045] The second acquisition submodule is used to acquire the pressure measurement value of the distillation column through the pressure controller;

[0046] The judgment module includes:

[0047] The second determining submodule is used to determine whether the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column when the pressure measurement value of the distillation column increases.

[0048] In one embodiment, the control module includes:

[0049] The second control submodule is used to control the second valve position controller to increase the measured value of the second valve position controller when the pressure measurement value of the distillation column increases, thereby causing the output value of the second valve position controller to decrease under the reaction, so that the output value of the second valve position controller is selected by the low selection controller, and the low selection controller uses the selected value as the feed rate of the distillation column.

[0050] In one embodiment, the second control submodule is further configured to:

[0051] When the pressure measurement value of the distillation column increases, the output value of the pressure controller increases under positive action;

[0052] The increased pressure controller output value is transmitted to the second valve position controller, so that the measured value of the second valve position controller increases;

[0053] The output value of the second valve position controller decreases under the reaction, making the output value of the second valve position controller lower than the output value of the first valve position controller and lower than the output value of the manual controller, so that the output value of the second valve position controller is selected by the low selection controller.

[0054] This application also provides a feed rate control system, including:

[0055] At least one processor; and,

[0056] A memory communicatively connected to the at least one processor; wherein,

[0057] The memory stores instructions that can be executed by the at least one processor to implement the feed rate control method described in any of the above embodiments.

[0058] This application also provides a computer-readable storage medium, characterized in that when the instructions in the storage medium are executed by a processor corresponding to the feed rate control system, the feed rate control system is able to implement the feed rate control method described in any of the above embodiments.

[0059] 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.

[0060] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0061] 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:

[0062] Figure 1 This is a flowchart of a feed rate control method in one embodiment of this application;

[0063] Figure 2 This is a schematic diagram of the structure of a distillation system in the prior art;

[0064] Figure 3 This is a schematic diagram of a distillation system according to one embodiment of this application;

[0065] Figure 4 This is a schematic diagram of the structure of a feed rate control device according to an embodiment of this application;

[0066] Figure 5 This is a schematic diagram of the hardware structure of a feeding control system according to an embodiment of this application. Detailed Implementation

[0067] 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.

[0068] Figure 1 This is a flowchart of a feed rate control method according to an embodiment of this application, such as... Figure 1 As shown, the method can be implemented as follows: S101-S104:

[0069] In step S101, during the operation of the distillation column, the preset parameters of the distillation column are acquired;

[0070] In step S102, it is determined whether the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column based on the preset parameters of the distillation column.

[0071] In step S103, when the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column, the corresponding valve position controller output value is reduced by the component that obtains the preset parameter, so that the valve position controller output value is selected by the low selection controller. The low selection controller is used to select the minimum value from the output values ​​of the valve position controller and the manual controller, and transmit the minimum value to the feed flow controller.

[0072] In step S104, the output value of the valve position controller is transmitted to the feed flow controller through the low selection controller, so that the feed flow controller reduces the feed rate according to the output value of the valve position controller.

[0073] Figure 2 A schematic diagram of the structure of a distillation system in the prior art, such as... Figure 2 As shown, in the prior art, the distillation system includes: a feed fractionation column, a feed buffer tank, a condensate tank, a reboiler, and corresponding control valves. During the distillation process, the feed mixture from upstream enters the buffer tank for buffering, and the liquid level in the buffer tank controls the feed from upstream. The mixture is then fed to the distillation column for separation via a feed pump with a constant flow rate. The reboiler uses S2 steam as a heat source. The vapor phase separated at the top of the column enters an air cooler for condensation. After condensation, the separated product forms condensate which enters the condensate tank. Part of the condensate in the condensate tank is returned to the distillation column as reflux, and the other part is sent downstream as for further processing. The heavy components in the reboiler remain at the bottom of the distillation column and are sent to the incineration system for processing. In the control process of the distillation system, the temperature of the sensitive plate inside the column is used to control the feed rate of S2 steam in a cascade manner; the fan frequency of the air cooler is controlled by the column pressure; in addition, in order to maintain the stability of the condensate level in the condensate tank, the condensate external flow rate is controlled by the cascade level of the condensate tank; in order to maintain the stability of the heavy component level in the column bottom, the waste liquid from the column bottom is controlled by the cascade level of the column bottom.

[0074] However, during distillation, when the system load increases, regulating the cooling capacity solely by controlling the top pressure and the reboiler temperature for heating can lead to incomplete separation, resulting in feed waste, and even situations like column overflow or overpressure in the distillation column. For example, during distillation, the composition of the feed mixture from upstream often changes, which may cause insufficient separation capacity in the refining column. This means that even with the reboiler steam running at full capacity, most of the lighter components in the feed mixture cannot be distilled to the top of the column, resulting in a large amount of feed being drawn from the reboiler into the incineration system, causing feed waste. Simultaneously, the significant increase in the reboiler level of the heavier components also poses a potential risk of column overflow. Furthermore, due to seasonal temperature variations, in the summer when ambient temperatures are high, the condensation capacity of the air cooler may be insufficient. This means that even with the air cooler fan running at full frequency, the top separated product may not be completely condensed, causing increased column pressure. This can lead to some separated product being discharged into the incineration system with the top vapor, resulting in feed waste, and in extreme cases, even causing the distillation column to overpressure and rupture.

[0075] Therefore, this application provides a variable load adaptive control scheme for a distillation column, which can automatically reduce the feed rate when the capacity of the top condenser and bottom reboiler of the distillation column is limited. The adjustment of their working load can perfectly match the current limiting conditions, improve the anti-interference ability of the distillation column operation, and avoid raw material waste and safety risks caused by abnormal separation of the distillation column.

[0076] Figure 3 This is a schematic diagram of a distillation system according to one embodiment of this application, as shown below. Figure 3As shown, based on the existing technical solution, this distillation system adds a first valve position controller, a second valve position controller, a manual controller, and a low-selection controller. The input of the first valve position controller is connected to the output of the column reboiler steam flow controller FC2, used to determine the corresponding feed rate based on the column reboiler steam flow rate, and its output goes to the low-selection controller. The input of the second valve position controller is connected to the output of the column top pressure controller PC, used to determine the corresponding feed rate based on the real-time monitored column top pressure, and its output goes to the low-selection controller. The input of the manual controller is used to receive the operation command for the feed rate, and its output also goes to the low-selection controller. The low-selection controller receives the feed rates output by the first valve position controller, the second valve position controller, and the manual controller, and selects the lowest value among the three as the setpoint for the distillation column feed controller FC1 to control the distillation column feed rate. Furthermore, unlike common temperature / pressure / flow controllers, in this application, both the first and second valve position controllers employ a weak proportional + large integral PID tuning strategy. The input signal value (in this example, the frequency conversion value output by the pressure controller at the top of the column; the valve position value output by the temperature controller at the bottom of the column) is compared with a preset frequency conversion value / valve position value. The resulting deviation is then used to calculate the output signal value based on preset PID (proportional / integral / derivative) parameters. The setpoint is an upper limit value, and the maximum load of the top condenser and bottom reboiler needs to be determined according to process requirements. This maximum load can be customized by the operator to limit the column's separation capacity; for example, 80%-90% is a suitable value. In one embodiment of this application, the default value is 90%.

[0077] Furthermore, there are two types of regulators: direct-acting and reverse-acting. When the input quantity of the controlled process (material or energy passing through the regulating valve) increases (or decreases), its output (controlled parameter) also increases (or decreases). In this case, the controlled process is called a direct-acting regulator. Conversely, when the input quantity of the controlled process increases, its output decreases. In one embodiment of this application, in such a case... Figure 3 In the distillation system shown, the column top pressure controller PC is positive-acting, the column bottom temperature controller TC is negative-acting, the first valve position controller and the second valve position controller are negative-acting, the feed flow controller FC1 and the steam flow controller FC2 are both negative-acting, and the feed regulating valve V1 and the steam regulating valve V2 are both gas-to-open valves.

[0078] During the operation of the distillation column, preset parameters of the distillation column are acquired. In order to monitor the operation of the distillation column, multiple components of the distillation column are monitored in advance, such as the top pressure and the bottom temperature.

[0079] The system determines whether the feed rate of the distillation column exceeds its maximum processing capacity based on the preset parameters of the distillation column. During normal operation, the condenser or S2 vapor automatically adjusts the feedback conditions, ensuring stable operation of various monitoring indicators, such as indicator ranges, amplitudes of change, and frequency of change. A drastic change in any indicator indicates that the feed rate exceeds the maximum processing capacity of the distillation column. For example, when the preset parameter is the temperature measurement value of the distillation column, the overall temperature is stable. Therefore, when the temperature measurement value decreases—specifically, the temperature gradient shifts downward, i.e., the decrease is greater than the preset temperature value and the duration is greater than the first preset duration—it is determined that the feed rate exceeds the maximum processing capacity of the distillation column. Similarly, when the preset parameter is the pressure measurement value of the distillation column, the pressure is generally stable during normal operation. When the pressure measurement value increases—specifically, when the pressure measurement value exceeds the preset pressure value and the duration is greater than the second preset duration—it is determined that the feed rate exceeds the maximum processing capacity of the distillation column.

[0080] When the feed rate to the distillation column exceeds its maximum processing capacity, a component that acquires the preset parameters controls the corresponding valve position controller to reduce its output value. This reduces the output value of the valve position controller, causing it to be selected by a low-selection controller. The low-selection controller selects the minimum value from the output values ​​of the valve position controller and the manual controller, and transmits this minimum value to the feed flow controller. When controlling the reduction of the valve position controller's output value by acquiring the preset parameters, the specific reduction amount can be predetermined through settings. For example, the relationship between the preset parameter's variation range and the valve position controller's output value can be established. Alternatively, a simulation model can be pre-built to obtain the correspondence between the preset parameters and the feed rate, and the feed rate corresponding to the preset parameters can be calculated in real time as the valve position controller's output value. This application does not limit the specific determination method.

[0081] Then, the output value of the valve position controller is transmitted to the feed flow controller through the low-selection controller, so that the feed flow controller reduces the feed rate according to the output value of the valve position controller.

[0082] Specifically, the control process of this system is as follows:

[0083] (1) Stable operation of the distillation column

[0084] Since the inputs of the first and second valve position controllers are used to determine the corresponding maximum feed rate based on the real-time monitored reboiler steam flow rate / top pressure, and both controllers are reaction-acting, when the distillation column is in stable operation, the frequency converter of the air cooler at the top of the column is in a suitable operating range. The output value of the top pressure controller PC will be much lower than the set high limit of the second valve position controller, resulting in a maximum feed rate output by the second valve position controller, which cannot be selected by the low-selection controller. Similarly, the reboiler steam valve is also in a suitable operating range, and the feed rate output value of the reboiler steam flow controller FC2 will also be much lower than the set high limit of the first valve position controller, resulting in a maximum feed rate output, which also cannot be selected by the low-selection controller. Therefore, under stable operating conditions, the output value of the low-selection controller will be the input value of the manual controller; that is, the distillation column can operate stably by setting the correct feed rate according to the manual controller.

[0085] (2) Changes in feed composition

[0086] If, at any given moment, the feed composition of the distillation column changes significantly, with the concentration of light components increasing beyond the column's processing capacity, this will cause the distillation column temperature gradient to shift downwards, leading to a decrease in the TC measurement value of the reboiler temperature controller. The temperature controller then increases the measurement value of the first valve position controller connected to the steam regulating valve, causing the output value of the first valve position controller to decrease in response, thus enabling the first valve position controller's output value to be selected by the low-select controller. Specifically, the temperature controller transmits its output value to the steam flow controller to increase the setpoint of the steam flow controller, thereby increasing the opening of the steam regulating valve. When the measured value of the temperature controller decreases, its output value increases in response to the temperature controller. The steam flow controller uses the output value of the temperature controller as its own setpoint. When the opening of the steam regulating valve increases, the measured value of the valve position controller connected to the steam regulating valve also increases. When the measured value of the first valve position controller connected to the steam regulating valve increases, its output value decreases in response to the temperature controller, making its output value lower than that of the second valve position controller and also lower than that of the manual controller, so that the first valve position controller's output value is selected by the low-select controller. In one specific embodiment, because the tower temperature controller TC is reaction-acting, its output value, i.e., the setpoint of the steam flow controller FC2, increases. This manifests as an increase in the opening of the steam regulating valve V2 and an increase in the measured value of the first valve position controller. However, because the first valve position controller is reaction-acting, the feed rate output by the first valve position controller will gradually decrease. When the measured value of the first valve position controller approaches its set high limit, it means that the reboiler in the column bottom has reached its maximum capacity. At this time, since the feed rate output values ​​of the second valve position controller and the manual controller are the feed rate values ​​under normal conditions, while the output value of the first valve position controller will be much lower than the feed rate values ​​under normal conditions, the output value of the first valve position controller will be selected by the low-select controller to connect to the feed flow controller FC1. Then, the distillation column system will reduce the feed flow rate of the distillation column according to the current column bottom vapor flow rate to match the current maximum capacity of the reboiler. This avoids the distillation column separation effect from being reduced due to insufficient capacity of the column bottom reboiler, which could lead to light components entering the column bottom and causing raw material waste or distillation column flooding.

[0087] When the fluctuations in the subsequent feed composition subside, the steam flow rate in the reboiler exceeds the required value under the current feed load and composition. The measured value of the reboiler temperature controller TC increases. Since TC is a reaction controller, the setpoint of the steam flow controller FC2 decreases. This is manifested in two ways: firstly, reducing the opening of the steam regulating valve V2, and secondly, reducing the measured value of the first valve position controller. Because the first valve position controller is a reaction controller, the feed flow rate output value of the first valve position controller will gradually increase. When the measured value of the first valve position controller falls below its set high limit, the manual controller takes over control of the feed flow rate of the distillation column to ensure that it returns to stable operation at the normal design load.

[0088] (3) Changes in pressure at the top of the tower

[0089] If the ambient temperature is too high in summer, the condensation effect of the air cooler at the top of the distillation column deteriorates, and the column pressure increases. When the pressure measurement value of the distillation column increases, the pressure controller controls the measurement value of the second valve position controller to increase, which in turn causes the output value of the second valve position controller to decrease under the reaction, so that the output value of the second valve position controller is selected by the low-selection controller. The low-selection controller uses the selected value as the feed rate of the distillation column. Specifically, when the pressure measurement value of the distillation column increases, the pressure controller output value increases under the positive action; the increased pressure controller output value is transmitted to the second valve position controller, causing the measurement value of the second valve position controller to increase; the output value of the second valve position controller decreases under the reaction, so that the output value of the second valve position controller is lower than the output value of the first valve position controller and lower than the output value of the manual controller, so that the output value of the second valve position controller is selected by the low-selection controller. In one specific embodiment, the measured value of the column top pressure controller PC increases. Since the column top pressure controller PC is positively acting, it increases the frequency conversion of the air cooler fan and also increases the measured value of the second valve position controller. However, since the second valve position controller is negatively acting, the feed rate output by the second valve position controller will gradually decrease. When the measured value of the second valve position controller approaches its set high limit, it means that the column top air cooler has reached its maximum capacity. At this time, since the feed rate output values ​​of the first valve position controller and the manual controller are the feed rate values ​​under normal conditions, while the output value of the second valve position controller will be much lower than the feed rate values ​​under normal conditions, the feed rate output by the second valve position controller is selected by the low-select controller to control the feed flow controller FC1. This, in turn, reduces the feed flow rate of the distillation column according to the current column top pressure value to match the current maximum capacity of the air cooler. This avoids the loss of light components in the gas phase due to insufficient capacity of the column top air cooler, resulting in raw material waste or causing adverse consequences such as overpressure rupture of the distillation column.

[0090] When the subsequent high temperatures of summer subside, the condensing capacity of the reboiler cooler recovers, and the measured value of the pressure controller PC at the top of the column decreases. Since PC is a direct-acting controller, it reduces the frequency of the cooler fan and also lowers the measured value of the second valve position controller. Because the second valve position controller is a reverse-acting controller, its output value will gradually increase. When the measured value of the second valve position controller falls below its set high limit, the manual controller takes over control of the feed flow rate of the distillation column, ensuring its return to stable operation at its normal design load.

[0091] In summary, the above analysis shows that the distillation system, after introducing a valve position controller, a manual controller, and a low-selection controller, can automatically reduce the feed rate and adjust its workload to perfectly match the current constraints when the capacity of the distillation column's overhead condenser and reboiler is limited. When the capacity constraints of the subsequent distillation column's overhead condenser and reboiler are relieved, it resumes stable operation at its normal design load. This significantly improves the distillation column's anti-interference capability and avoids raw material waste and safety risks caused by abnormal separation in the distillation column.

[0092] The beneficial effects of this application are as follows: By setting corresponding valve position controllers for multiple components of the distillation system, preset parameters of the distillation column are acquired during its operation, and the feed rate is determined based on these preset parameters to determine whether it exceeds the maximum processing capacity of the distillation column. When the feed rate exceeds the maximum processing capacity, the corresponding valve position controller output value is reduced by the component used to acquire the preset parameters, so that the valve position controller output value is selected by a low-selection controller. The low-selection controller selects the minimum value from the output values ​​of the valve position controller and the manual controller, and transmits the minimum value to the feed flow controller. The low-selection controller then transmits the valve position controller output value to the feed flow controller, so that the feed flow controller reduces the feed rate based on the valve position controller output value. Therefore, when the feed rate exceeds the maximum processing capacity of the distillation column, the system feed rate is reduced according to the corresponding preset parameters, achieving automatic adjustment and control of the feed rate based on the actual load of the distillation column, thus avoiding resource waste or dangerous situations during the distillation process.

[0093] In one embodiment, step S101 above can be implemented as step A1 as follows:

[0094] In step A1, the temperature measurement value of the distillation column is obtained through a temperature controller;

[0095] The above step S102 can be implemented as step A2 as follows:

[0096] In step A2, when the temperature measurement of the distillation column decreases, it is determined that the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column.

[0097] In one embodiment, step S103 above can be implemented as step A3 as follows:

[0098] In step A3, the temperature controller controls the measurement value of the first valve position controller connected to the steam regulating valve to increase, thereby causing the output value of the first valve position controller to decrease under the reaction, so that the output value of the first valve position controller is selected by the low selection controller.

[0099] In one embodiment, step A3 above can be implemented as steps A31-A32:

[0100] In step A31, the output value of the temperature controller is transmitted to the steam flow controller to increase the set value of the steam flow controller, thereby increasing the opening of the steam regulating valve. When the measured value of the temperature controller decreases, the output value of the temperature controller increases under the reaction. The steam flow controller uses the output value of the temperature controller as its own set value. When the opening of the steam regulating valve increases, the measured value of the valve position controller connected to the steam regulating valve also increases.

[0101] In step A32, when the measured value of the first valve position controller connected to the steam regulating valve increases, the output value of the first valve position controller decreases under the reaction, so that the output value of the first valve position controller is lower than the output value of the second valve position controller and lower than the output value of the manual controller, so that the output value of the first valve position controller is selected by the low selection controller.

[0102] In one embodiment, step S101 above can be implemented as step B1 as follows:

[0103] In step B1, the pressure measurement value of the distillation column is obtained through the pressure controller;

[0104] The above step S102 can be implemented as the following step B2:

[0105] In step B2, when the pressure measurement value of the distillation column increases, it is determined that the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column.

[0106] In one embodiment, step S103 above can be implemented as step B3 as follows:

[0107] In step B3, when the pressure measurement value of the distillation column increases, the pressure controller controls the measurement value of the second valve position controller to increase, thereby causing the output value of the second valve position controller to decrease under the reaction, so that the output value of the second valve position controller is selected by the low-selection controller, and the low-selection controller uses the selected value as the feed rate of the distillation column.

[0108] In one embodiment, step B3 above can be implemented as steps B31-B33:

[0109] In step B31, when the pressure measurement value of the distillation column increases, the output value of the pressure controller increases under positive action;

[0110] In step B32, the increased pressure controller output value is transmitted to the second valve position controller so that the measured value of the second valve position controller increases.

[0111] In step B33, the output value of the second valve position controller decreases under the reaction, making the output value of the second valve position controller lower than the output value of the first valve position controller and lower than the output value of the manual controller, so that the output value of the second valve position controller is selected by the low selection controller.

[0112] In one specific embodiment of this application, the distillation column is a butyraldehyde refining column of a TMP unit. The column top pressure controller PC is direct-acting, the column bottom temperature controller TC is reverse-acting, the first valve position controller and the second valve position controller are reverse-acting, the feed flow controller FC1 and the steam flow controller FC2 are both reverse-acting, and the feed regulating valve V1 and the steam regulating valve V2 are both gas-to-open valves. The upper limit set for both the first valve position controller and the second valve position controller is 90%.

[0113] During normal operation, the distillation column is in a stable operating state. At this time, the fan of the top air cooler is operating at 50% frequency, and the output value of the top pressure controller PC (50%) is far lower than the set high limit of 90% of the second valve position controller. Since the second valve position controller is reaction-acting, its output value is much higher than the output value of the manual controller and cannot be selected by the low-selection control module. Similarly, the steam valve position of the column bottom is 50%, and the output value of the column bottom steam flow controller FC2 (50%) is also far lower than the set high limit of 90% of the first valve position controller. Since the first valve position controller is reaction-acting, its output value is also much higher than the output value of the manual controller and cannot be selected by the low-selection control module. Therefore, under stable operating conditions, the output value of the low-selection control module will be the input value of the manual controller (50t / h). That is, the distillation column can operate stably as long as the manual controller is set to the correct feed flow rate. At a certain moment, the composition of the crude butyraldehyde from the upstream butanol unit undergoes a significant change. The concentrations of heavy components such as butanol and trimer decrease, while the concentration of the light component butyraldehyde increases significantly, exceeding the column's processing capacity. At this point, the distillation column temperature gradient shifts downward, and the measured value of the column bottom temperature controller TC decreases. Since TC is a reaction-acting controller, the setpoint of the steam flow controller FC2 increases. This manifests as an increase in the opening of the steam regulating valve V2 and an increase in the measured value of the first valve position controller. Because the first valve position controller is a reaction-acting controller, its output value gradually decreases. When the measured value of the first valve position controller approaches 90% of its set upper limit, it indicates that the column bottom reboiler has reached its maximum capacity under the current feed composition. At this point, the output value of the first valve position controller is selected by the low-selection control module to control the feed flow controller FC1, thereby reducing the distillation column feed flow rate to 35 t / h to match the maximum capacity of the reboiler under the current feed composition. This prevents the distillation column from experiencing poor separation due to insufficient reboiler capacity, which could lead to light components entering the column bottom, wasting raw materials, or causing the distillation column to become flooded. When the fluctuations in the subsequent feed composition subside, the steam flow rate in the reboiler exceeds the required value under the current feed load and composition. The measured value of the reboiler temperature controller TC increases. Since TC is a reaction controller, the setpoint of the steam flow controller FC2 decreases. This is manifested in two ways: firstly, reducing the opening of the steam regulating valve V2, and secondly, reducing the measured value of the first valve position controller. Because the first valve position controller is a reaction controller, its output value will gradually increase. When the measured value of the first valve position controller falls below 90% of its set upper limit, the manual controller takes over control of the feed flow rate of the distillation column at 50 t / h to ensure its return to stable operation at the normal design load.

[0114] When high temperatures arrive in summer, the condensation effect of the top air cooler in the distillation column deteriorates, leading to increased column pressure. At this time, the measured value of the top pressure controller PC increases. Since PC is a positive-acting controller, it increases the frequency of the air cooler fan and also raises the measured value of the second valve position controller. Because the second valve position controller is a negative-acting controller, its output value gradually decreases. When the measured value of the second valve position controller approaches 90% of its set high limit, it indicates that the top air cooler has reached its maximum capacity under these weather conditions. At this point, the output value of the second valve position controller is selected by the low-selection control module to control the feed flow controller FC1, thereby reducing the feed flow rate of the distillation column to 23 t / h to match the maximum capacity of the air cooler under the current weather conditions. This prevents the loss of light components due to insufficient capacity of the top air cooler, avoiding raw material waste or even causing overpressure rupture of the distillation column. When the subsequent high temperatures of summer subside, the condensing capacity of the reboiler cooler recovers, and the measured value of the pressure controller PC at the top of the column decreases. Since PC is a positive-acting controller, it reduces the frequency of the cooler fan and also lowers the measured value of the second valve position controller. Because the second valve position controller is a negative-acting controller, its output value gradually increases. When the measured value of the second valve position controller falls below 90% of its set high limit, the manual controller takes over control of the feed flow rate of the distillation column at 50 t / h, ensuring its return to stable operation at its normal design load. After implementing the adaptive variable load control scheme described in this application, the butyraldehyde refining column of the TMP unit perfectly solves the raw material waste and safety risks caused by changes in the feed composition of the upstream butanol unit and the rise in summer ambient temperature. Because the butyraldehyde refining column feed buffer tank has a large buffering capacity and a control scheme using buffer tank level control for feed is adopted, even if the first and second valve position controllers take over the feed flow controller for a period of time, it will not cause significant process fluctuations. In addition, operators can judge the duration of fluctuation conditions based on experience and choose to modify the setting value of the manual controller according to the current feed flow rate or wait for the fluctuation conditions to be resolved.

[0115] Figure 4 This is a schematic diagram of the structure of a feed rate control device according to an embodiment of this application, as shown below. Figure 4 As shown, the device includes:

[0116] The acquisition module 401 is used to acquire the preset parameters of the distillation column during the operation of the distillation column;

[0117] The judgment module 402 is used to determine whether the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column based on the preset parameters of the distillation column.

[0118] Control module 403 is used to control the output value of the corresponding valve position controller to decrease by acquiring the preset parameters when the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column, so that the output value of the valve position controller is selected by the low selection controller. The low selection controller is used to select the minimum value from the output values ​​of the valve position controller and the manual controller, and transmit the minimum value to the feed flow controller.

[0119] The reduction module 404 is used to transmit the output value of the valve position controller to the feed flow controller through the low selection controller, so that the feed flow controller reduces the feed rate according to the output value of the valve position controller.

[0120] In one embodiment, the acquisition module includes:

[0121] The first acquisition submodule is used to acquire the temperature measurement value of the distillation column through the temperature controller;

[0122] The judgment module includes:

[0123] The first determining submodule is used to determine that the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column when the temperature measurement value of the distillation column decreases.

[0124] In one embodiment, the control module includes:

[0125] The first control submodule is used to increase the measured value of the first valve position controller connected to the steam regulating valve through the temperature controller, thereby causing the output value of the first valve position controller to decrease under the reaction, so that the output value of the first valve position controller is selected by the low selection controller.

[0126] In one embodiment, the first control submodule is further configured to:

[0127] The output value of the temperature controller is transmitted to the steam flow controller to increase the set value of the steam flow controller, thereby increasing the opening of the steam regulating valve. When the measured value of the temperature controller decreases, the output value of the temperature controller increases under the reaction. The steam flow controller uses the output value of the temperature controller as its own set value. When the opening of the steam regulating valve increases, the measured value of the valve position controller connected to the steam regulating valve also increases.

[0128] When the measured value of the first valve position controller connected to the steam regulating valve increases, the output value of the first valve position controller decreases under the reaction, so that the output value of the first valve position controller is lower than the output value of the second valve position controller and lower than the output value of the manual controller, so that the output value of the first valve position controller is selected by the low selection controller.

[0129] In one embodiment, the acquisition module includes:

[0130] The second acquisition submodule is used to acquire the pressure measurement value of the distillation column through the pressure controller;

[0131] The judgment module includes:

[0132] The second determining submodule is used to determine whether the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column when the pressure measurement value of the distillation column increases.

[0133] In one embodiment, the control module includes:

[0134] The second control submodule is used to control the second valve position controller to increase the measured value of the second valve position controller when the pressure measurement value of the distillation column increases, thereby causing the output value of the second valve position controller to decrease under the reaction, so that the output value of the second valve position controller is selected by the low selection controller, and the low selection controller uses the selected value as the feed rate of the distillation column.

[0135] In one embodiment, the second control submodule is further configured to:

[0136] When the pressure measurement value of the distillation column increases, the output value of the pressure controller increases under positive action;

[0137] The increased pressure controller output value is transmitted to the second valve position controller, so that the measured value of the second valve position controller increases;

[0138] The output value of the second valve position controller decreases under the reaction, making the output value of the second valve position controller lower than the output value of the first valve position controller and lower than the output value of the manual controller, so that the output value of the second valve position controller is selected by the low selection controller.

[0139] Figure 5 This is a schematic diagram of the hardware structure of a feeding control system according to one embodiment of this application, as shown below. Figure 5 As shown, the feeding control system includes:

[0140] At least one processor 520; and,

[0141] Memory 504 communicatively connected to the at least one processor 520; wherein,

[0142] The memory 504 stores instructions that can be executed by the at least one processor 520 to implement the feeding control method described in any of the above embodiments.

[0143] Reference Figure 5The feeding control system 500 may include one or more of the following components: processing component 502, memory 504, power supply component 506, multimedia component 508, audio component 510, input / output (I / O) interface 512, sensor component 514, and communication component 516.

[0144] Processing component 502 typically controls the overall operation of the feed control system 500. Processing component 502 may include one or more processors 520 to execute instructions to complete all or part of the steps of the method described above. Furthermore, processing component 502 may include one or more modules to facilitate interaction between processing component 502 and other components. For example, processing component 502 may include a multimedia module to facilitate interaction between multimedia component 508 and processing component 502.

[0145] Memory 504 is configured to store various types of data to support the operation of the feed control system 500. Examples of this data include instructions for any application or method operating on the feed control system 500, such as text, images, videos, etc. Memory 504 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.

[0146] Power supply assembly 506 provides power to various components of the feed control system 500. Power supply assembly 506 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the onboard control system 500.

[0147] The multimedia component 508 includes a screen that provides an output interface between the feed control system 500 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 508 may also include a front-facing camera and / or a rear-facing camera. When the feed control system 500 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.

[0148] Audio component 510 is configured to output and / or input audio signals. For example, audio component 510 includes a microphone (MIC) configured to receive external audio signals when the feed control system 500 is in an operating mode, such as an alarm mode, recording mode, voice recognition mode, and voice output mode. The received audio signals may be further stored in memory 504 or transmitted via communication component 516. In some embodiments, audio component 510 also includes a speaker for outputting audio signals.

[0149] I / O interface 512 provides an interface between processing component 502 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.

[0150] Sensor assembly 514 includes one or more sensors for providing status assessments of various aspects of the feed control system 500. For example, sensor assembly 514 may include a sound sensor. Additionally, sensor assembly 514 may detect the on / off state of the feed control system 500, the relative positioning of components (e.g., the display and keypad of the feed control system 500), and the operating state of the feed control system 500 or a component thereof, such as the operating state of the air distribution plate, structural state, the operating state of the discharge scraper, the orientation or acceleration / deceleration of the feed control system 500, and temperature changes of the feed control system 500. Sensor assembly 514 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 514 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 514 may also include an accelerometer, a gyroscope, a magnetometer, a pressure sensor, a material buildup thickness sensor, or a temperature sensor.

[0151] Communication component 516 is configured to enable the feed control system 500 to provide wired or wireless communication capabilities with other devices and cloud platforms. The feed control system 500 can access wireless networks based on communication standards, such as WiFi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 516 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 516 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.

[0152] In an exemplary embodiment, the feeding control system 500 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 feeding control method described in any of the above embodiments.

[0153] This application also provides a computer-readable storage medium, characterized in that when the instructions in the storage medium are executed by a processor corresponding to the feed rate control system, the feed rate control system is able to implement the feed rate control method described in any of the above embodiments.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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 method for controlling the feed rate, characterized in that, include: During the operation of the distillation column, the preset parameters of the distillation column are obtained; Determine whether the feed rate of the distillation column exceeds its maximum processing capacity based on the preset parameters of the distillation column. When the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column, the corresponding valve position controller output value is reduced by the component that obtains the preset parameters, so that the valve position controller output value is selected by the low selection controller. The low selection controller is used to select the minimum value from the output values ​​of the valve position controller and the manual controller, and transmit the minimum value to the feed flow controller. The low-selection controller transmits the output value of the valve position controller to the feed flow controller, so that the feed flow controller reduces the feed rate according to the output value of the valve position controller. The valve position controller includes a first valve position controller and a second valve position controller. The input terminal of the first valve position controller is connected to the output terminal of the column bottom steam flow controller, and the input terminal of the second valve position controller is connected to the output terminal of the column top pressure controller. Both the first valve position controller and the second valve position controller are configured to be reaction-acting, and the set values ​​of the first valve position controller and the second valve position controller are both the upper limit values ​​reflecting the maximum load of the distillation column.

2. The method as described in claim 1, characterized in that, The process of obtaining the preset parameters of the distillation column includes: The temperature measurement value of the distillation column is obtained through a temperature controller; The step of determining whether the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column based on the preset parameters of the distillation column includes: When the temperature measurement of the distillation column decreases, it is determined that the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column.

3. The method as described in claim 2, characterized in that, The step of controlling the corresponding valve position controller output value to decrease by acquiring the preset parameters, so that the valve position controller output value is selected by the low-select controller, includes: The temperature controller controls the measurement value of the first valve position controller connected to the steam regulating valve to increase, thereby causing the output value of the first valve position controller to decrease under the reaction, so that the output value of the first valve position controller is selected by the low selection controller.

4. The method as described in claim 3, characterized in that, The measurement value of the first valve position controller connected to the steam regulating valve is increased by controlling the temperature controller, thereby causing the output value of the first valve position controller to decrease under the reaction, including: The output value of the temperature controller is transmitted to the steam flow controller to increase the set value of the steam flow controller, thereby increasing the opening of the steam regulating valve. When the measured value of the temperature controller decreases, the output value of the temperature controller increases under the reaction. The steam flow controller uses the output value of the temperature controller as its own set value. When the opening of the steam regulating valve increases, the measured value of the valve position controller connected to the steam regulating valve also increases. When the measured value of the first valve position controller connected to the steam regulating valve increases, the output value of the first valve position controller decreases under the reaction, so that the output value of the first valve position controller is lower than the output value of the second valve position controller and lower than the output value of the manual controller, so that the output value of the first valve position controller is selected by the low selection controller.

5. The method as described in claim 1, characterized in that, The process of obtaining the preset parameters of the distillation column includes: The pressure measurement value of the distillation column is obtained through a pressure controller; The step of determining whether the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column based on the preset parameters of the distillation column includes: When the pressure measurement value of the distillation column increases, it is determined that the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column.

6. The method as described in claim 5, characterized in that, The step of controlling the corresponding valve position controller output value to decrease by acquiring the preset parameters, so that the valve position controller output value is selected by the low-select controller, includes: When the pressure measurement value of the distillation column increases, the pressure controller controls the measurement value of the second valve position controller to increase, thereby causing the output value of the second valve position controller to decrease under the reaction, so that the output value of the second valve position controller is selected by the low selection controller, and the low selection controller uses the selected value as the feed rate of the distillation column.

7. The method as described in claim 6, characterized in that, When the pressure measurement value in the distillation column increases, the pressure controller controls the measurement value of the second valve position controller to increase, thereby causing the output value of the second valve position controller to decrease under the reaction, so that the output value of the second valve position controller is selected by the low-select controller, including: When the pressure measurement value of the distillation column increases, the output value of the pressure controller increases under positive action; The increased pressure controller output value is transmitted to the second valve position controller, so that the measured value of the second valve position controller increases; The output value of the second valve position controller decreases under the reaction, making the output value of the second valve position controller lower than the output value of the first valve position controller and lower than the output value of the manual controller, so that the output value of the second valve position controller is selected by the low selection controller.

8. A feed rate control device, used in the feed rate control method as described in any one of claims 1-7, characterized in that, include: The acquisition module is used to acquire the preset parameters of the distillation column during its operation. The judgment module is used to determine whether the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column based on the preset parameters of the distillation column. The control module is used to control the output value of the corresponding valve position controller to decrease when the feed rate of the distillation column exceeds the maximum processing capacity of the distillation column by acquiring the preset parameters, so that the output value of the valve position controller is selected by the low selection controller. The low selection controller is used to select the minimum value from the output values ​​of the valve position controller and the manual controller, and transmit the minimum value to the feed flow controller. The reduction module is used to transmit the output value of the valve position controller to the feed flow controller through the low selection controller, so that the feed flow controller reduces the feed rate according to the output value of the valve position controller.

9. A feed rate control system, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to implement the feed rate control method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the processor corresponding to the feed rate control system, the feed rate control system is able to implement the feed rate control method as described in any one of claims 1-7.

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