Method, device, equipment and storage medium for controlling load of a fluidized bed reactor

Abstract

Embodiments of the present disclosure provide a kind of trickle bed reactor load control method, device, equipment and storage medium.The method comprises: obtaining the current load target value of trickle bed reactor;According to the load target value, adjust the liquid phase feed flow of trickle bed reactor;Obtain the current liquid phase feed flow, design liquid phase feed flow and design gas phase feed flow of trickle bed reactor;According to current liquid phase feed flow, design liquid phase feed flow, design gas phase feed flow, determine the set value of the gas phase feed flow of trickle bed reactor;According to the set value of the gas phase feed flow of trickle bed reactor, adjust the gas phase feed flow of trickle bed reactor.In this way, when load is raised and lowered, liquid phase feed flow and gas phase feed flow can be adjusted synchronously, maintain the liquid holdup of reactor in allowable range, so that the reactor can automatically reach new steady state.

Description

Technical Field

[0001] This disclosure relates to the field of trickle bed reactors, and more particularly to the field of trickle bed reactor load control technology. Background Technology

[0002] A trickle bed reactor is a relatively complex reactor involving three-phase reactions of gas, liquid, and solid. Therefore, its design and operation require relatively strict process conditions. However, currently, when the production load changes, especially during load increases or decreases, it is necessary to rely on the operator's experience to manually adjust process parameters such as the feed flow rate of each phase to bring the reactor to a new steady-state operation. This results in significant lag and process fluctuations. Summary of the Invention

[0003] This disclosure provides a method, apparatus, equipment, and storage medium for load control of a trickle bed reactor.

[0004] According to a first aspect of this disclosure, a method for load control in a trickle bed reactor is provided. The method includes:

[0005] Obtain the current target load value of the trickle bed reactor;

[0006] Adjust the liquid feed flow rate of the trickle bed reactor according to the target load value;

[0007] Obtain the current liquid phase feed flow rate, the design liquid phase feed flow rate, and the design gas phase feed flow rate of the trickle bed reactor;

[0008] The set value of the gas phase feed flow rate of the trickle bed reactor is determined based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed gas phase feed flow rate.

[0009] While adjusting the liquid phase feed flow rate, the gas phase feed flow rate of the trickle bed reactor is also adjusted according to the set value of the gas phase feed flow rate of the trickle bed reactor.

[0010] In addition to the aspects and any possible implementations described above, a further implementation is provided, wherein the method further includes:

[0011] Obtain the current liquid phase feed flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design cooling medium flow rate of the trickle bed reactor;

[0012] The set value of the cooling medium flow rate of the trickle bed reactor is determined based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed cooling medium flow rate.

[0013] While adjusting the liquid feed flow rate, the cooling medium flow rate of the trickle bed reactor is adjusted according to the set value of the cooling medium flow rate.

[0014] In addition to the aspects and any possible implementations described above, a further implementation is provided, wherein the method further includes:

[0015] Obtain the current liquid phase feed flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design cooling medium temperature of the trickle bed reactor;

[0016] The set value of the cooling medium temperature of the trickle bed reactor is determined based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed cooling medium temperature.

[0017] While adjusting the liquid feed flow rate, the cooling medium temperature of the trickle bed reactor is adjusted according to the set value of the cooling medium temperature.

[0018] In addition to the aspects and any possible implementations described above, a further implementation is provided, wherein the method further includes:

[0019] Determine whether the current liquid phase feed flow rate is lower than the preset lower limit of the liquid phase feed flow rate;

[0020] If the flow rate is lower than the preset lower limit of the liquid phase feed flow rate, the external circulation pump of the trickle bed reactor will be started to increase the external circulation flow rate of the liquid phase in the trickle bed reactor.

[0021] In addition to the aspects and any possible implementations described above, a further implementation is provided, wherein the method further includes:

[0022] Obtain the current liquid phase feed flow rate setpoint of the trickle bed reactor;

[0023] Calculate the flow difference between the preset lower limit of liquid phase feed flow rate and the current set value of liquid phase feed flow rate;

[0024] The flow difference is determined as the set value of the external circulation flow rate of the liquid phase in the trickle bed reactor;

[0025] If the flow rate is below the preset lower limit of the liquid phase feed rate, the external liquid phase circulation pump of the trickle bed reactor is started to increase the external liquid phase circulation flow rate of the trickle bed reactor, including:

[0026] If the flow rate is lower than the preset lower limit of the liquid phase feed flow rate, then after starting the liquid phase external circulation pump, the liquid phase external circulation flow rate is adjusted according to the set value of the liquid phase external circulation flow rate of the trickle bed reactor.

[0027] In addition to the aspects and any possible implementations described above, a further implementation is provided, wherein the method further includes:

[0028] Obtain the current external liquid phase circulation flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design circulation temperature of the external liquid phase circulation of the trickle bed reactor;

[0029] The set value of the circulation temperature of the liquid phase external circulation is determined based on the current liquid phase external circulation flow rate, the designed liquid phase feed flow rate, and the designed circulation temperature of the liquid phase external circulation.

[0030] Adjust the circulating temperature of the liquid phase external circulation of the trickle bed reactor according to the circulating temperature set value.

[0031] In addition to the aspects and any possible implementations described above, a further implementation is provided, wherein adjusting the liquid feed flow rate of the trickle bed reactor according to the target load value includes:

[0032] Obtain the liquid feed flow rate setpoint corresponding to the target load value;

[0033] Obtain the adjustment range of the liquid phase feed in the trickle bed reactor;

[0034] With the liquid phase feed flow rate set as the target, the liquid phase feed flow rate is adjusted according to the adjustment range of the liquid phase feed.

[0035] According to a second aspect of this disclosure, a load control device for a trickle bed reactor is provided. The device includes:

[0036] The first acquisition module is used to acquire the current target load value of the trickle bed reactor;

[0037] The first adjustment module is used to adjust the liquid phase feed flow rate of the trickle bed reactor according to the load target value;

[0038] The second acquisition module is used to acquire the current liquid phase feed flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design gas phase feed flow rate of the trickle bed reactor;

[0039] The determination module is used to determine the set value of the gas phase feed flow rate of the trickle bed reactor based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed gas phase feed flow rate.

[0040] The second adjustment module is used to adjust the gas phase feed flow rate of the trickle bed reactor according to the set value of the gas phase feed flow rate of the trickle bed reactor while adjusting the liquid phase feed flow rate.

[0041] According to a third aspect of this disclosure, an electronic device is provided. The electronic device includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the program to implement the method described above.

[0042] According to a fourth aspect of this disclosure, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the method according to a first aspect of this disclosure.

[0043] In this disclosure, after obtaining the current target load value of the trickle bed reactor, the liquid phase feed rate of the trickle bed reactor can be automatically adjusted according to the target load value. That is, the liquid phase feed rate is automatically adjusted when the load changes. Then, based on the current liquid phase feed rate, the designed liquid phase feed rate, and the designed gas phase feed rate, the set value of the gas phase feed rate of the trickle bed reactor is automatically determined. In this way, while adjusting the liquid phase feed rate, the gas phase feed rate of the trickle bed reactor can be adjusted synchronously according to the set value of the gas phase feed rate of the trickle bed reactor. Thus, when the load increases or decreases, the liquid phase feed rate and the gas phase feed rate can be adjusted synchronously to maintain the liquid holdup of the reactor within the allowable range, so that the reactor can automatically reach a new steady state. This avoids the adjustment lag and process fluctuations caused by relying on the operator's experience to adjust the gas and liquid phase feed rates when the load increases or decreases.

[0044] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0045] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. The drawings are provided for a better understanding of the invention and are not intended to limit the scope of this disclosure. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0046] Figure 1 A flowchart of a load control method for a trickle bed reactor according to an embodiment of the present disclosure is shown;

[0047] Figure 2 A schematic diagram of a trickle bed reactor load control system according to an embodiment of the present disclosure is shown;

[0048] Figure 3 A block diagram of a trickle bed reactor load control device according to an embodiment of the present disclosure is shown;

[0049] Figure 4 A block diagram of an exemplary electronic device capable of implementing embodiments of the present disclosure is shown. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0051] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0052] Figure 1 A flowchart of a trickle bed reactor load control method 100 according to an embodiment of the present disclosure is shown. Method 100 may include:

[0053] Step 110: Obtain the current target load value of the trickle bed reactor; the target load value is the feed amount required for the current production of the trickle bed reactor, and the feed can be at least one of liquid phase feed, gas phase feed and solid phase feed.

[0054] After a trickle bed reactor leaves the factory, it has its maximum load (also known as the normal production load), which is the maximum allowable feed rate. However, as the trickle bed reactor is used for a longer period of time or production targets change, the target load value will continue to change.

[0055] Step 120: Adjust the liquid feed flow rate of the trickle bed reactor according to the target load value;

[0056] For example, if the normal production load of the reactor corresponds to the liquid feed flow rate FLnormal (i.e., the design liquid feed flow rate), and the goal is to reduce the reactor load to 80%, then it is necessary to... Figure 2 The liquid feed flow controller FIC-01 setting value (i.e., liquid feed flow setting value) shown is adjusted to 80% * FLnormal.

[0057] However, to avoid significant process fluctuations during load adjustment, the load cannot be directly adjusted to the target value. Instead, the FIC-01setup value needs to be gradually adjusted in a certain gradient until the liquid feed flow rate is reached. The adjustment range for each step can be adjusted according to process requirements; it is recommended to adjust the load by 2–5% of the normal load.

[0058] Step 130: Obtain the current liquid phase feed flow rate, the design liquid phase feed flow rate, and the design gas phase feed flow rate of the trickle bed reactor;

[0059] Step 140: Determine the set value of the gas phase feed flow rate of the trickle bed reactor based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed gas phase feed flow rate;

[0060] like Figure 2 As shown, the setpoint for the gas-phase feed flow rate of the trickle bed reactor. FL is the current liquid phase feed flow rate, FLnormal is the design liquid phase feed flow rate, FGnormal is the design gas phase feed flow rate, and a and b are empirical mathematical model parameters, obtained by fitting based on known operating parameters.

[0061] The design liquid feed rate and design gas feed rate refer to the liquid feed rate and gas feed rate specified by the manufacturer under normal production load (i.e., ensuring the safety of the trickle bed reactor and reaching the maximum allowable load of the trickle bed reactor) after the reactor leaves the factory.

[0062] Step 150: While adjusting the liquid phase feed flow rate, adjust the gas phase feed flow rate of the trickle bed reactor according to the set value of the gas phase feed flow rate of the trickle bed reactor.

[0063] After obtaining the current target load value of the trickle bed reactor, the liquid phase feed rate of the trickle bed reactor can be automatically adjusted according to the target load value. That is, the liquid phase feed rate is automatically adjusted when the load changes. Then, based on the current liquid phase feed rate, the designed liquid phase feed rate, and the designed gas phase feed rate, the set value of the gas phase feed rate of the trickle bed reactor is automatically determined. In this way, while adjusting the liquid phase feed rate, the gas phase feed rate of the trickle bed reactor can be adjusted synchronously according to the set value of the gas phase feed rate. Thus, when the load increases or decreases, the liquid phase feed rate and the gas phase feed rate can be adjusted synchronously to maintain the liquid holdup of the reactor within the allowable range, so that the reactor can automatically reach a new steady state. This avoids the adjustment lag and process fluctuations caused by relying on the operator's experience to adjust the gas and liquid phase feed rates when the load increases or decreases.

[0064] In some embodiments, the method further includes:

[0065] Obtain the current liquid phase feed flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design cooling medium flow rate of the trickle bed reactor;

[0066] The design cooling medium flow rate refers to the flow rate of the cooling medium entering the reactor under normal load, as specified by the manufacturer after the trickle bed reactor leaves the factory.

[0067] The set value of the cooling medium flow rate of the trickle bed reactor is determined based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed cooling medium flow rate.

[0068] Set value of cooling medium flow rate in trickle bed reactor FL is the current liquid feed flow rate, FLnormal is the design liquid feed flow rate, FWnormal is the design cooling medium flow rate, and c and d are empirical mathematical model parameters, obtained by fitting based on known operating parameters.

[0069] While adjusting the liquid feed flow rate, the cooling medium flow rate of the trickle bed reactor is adjusted according to the set value of the cooling medium flow rate.

[0070] After automatically determining the set value of the cooling medium flow rate of the trickle bed reactor based on the current liquid feed flow rate, the designed liquid feed flow rate, and the designed cooling medium flow rate, the cooling medium flow rate of the trickle bed reactor can be automatically adjusted according to the set value of the cooling medium flow rate while adjusting the liquid feed flow rate. In this way, when the load is increased or decreased, the liquid feed flow rate and the gas feed flow rate can be adjusted simultaneously, and the cooling medium flow rate of the trickle bed reactor can also be adjusted simultaneously. Thus, while adjusting the liquid feed flow rate and the gas feed flow rate to maintain the liquid holdup of the reactor within the allowable range, the flow rate of the cooling medium on the reactor shell side can also be adjusted simultaneously to maintain the axial temperature distribution curve of the reactor.

[0071] In some embodiments, the method further includes:

[0072] Obtain the current liquid phase feed flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design cooling medium temperature of the trickle bed reactor;

[0073] The set value of the cooling medium temperature of the trickle bed reactor is determined based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed cooling medium temperature.

[0074] The design cooling medium temperature refers to the temperature of the cooling medium entering the reactor under normal load, as specified by the manufacturer after the trickle bed reactor leaves the factory.

[0075] Cooling medium temperature setpoint FL is the current liquid feed flow rate, FLnormal is the design liquid feed flow rate, TWnormal is the design cooling medium temperature, and e is the empirical mathematical model parameter, which is obtained by fitting the known operating parameters.

[0076] While adjusting the liquid feed flow rate, the cooling medium temperature of the trickle bed reactor is adjusted according to the set value of the cooling medium temperature.

[0077] When adjusting the liquid and gas feed flow rates, the cooling medium temperature of the trickle bed reactor can be adjusted according to the set value of the cooling medium temperature. In this way, while adjusting the liquid and gas feed flow rates to maintain the reactor liquid holdup within the allowable range, the cooling medium temperature on the reactor shell side is adjusted simultaneously to maintain the reactor axial temperature distribution curve.

[0078] In some embodiments, the method further includes:

[0079] Determine whether the current liquid phase feed flow rate is lower than the preset lower limit of the liquid phase feed flow rate;

[0080] If the flow rate is below the preset lower limit of the liquid phase feed rate, then the external liquid phase circulation pump of the trickle bed reactor (e.g., Figure 2 (P01 in the text) to increase the external circulation flow rate of the liquid phase in the trickle bed reactor.

[0081] If the current liquid phase feed flow rate is lower than the preset lower limit of the liquid phase feed flow rate, the liquid phase external circulation pump P01 of the trickle bed reactor is started, and the external circulation flow controller FIC-03 ​​adjusts the liquid phase external circulation flow rate FR of the reactor by opening the FV3 valve.

[0082] In some embodiments, the method further includes:

[0083] Obtain the current liquid phase feed flow rate setpoint of the trickle bed reactor;

[0084] Calculate the flow difference between the preset lower limit of liquid phase feed flow rate and the set value of liquid phase feed flow rate;

[0085] The flow difference is determined as the set value of the external circulation flow rate of the liquid phase in the trickle bed reactor;

[0086] The set value of the external circulation flow rate of the liquid phase in the trickle bed reactor is FIC-03setup = the difference between Fallow and FIC-01setup, where Fallow is the preset lower limit of the liquid phase feed flow rate and FIC-01setup is the set value of the liquid phase feed flow rate.

[0087] If the flow rate is below the preset lower limit of the liquid phase feed rate, the external liquid phase circulation pump of the trickle bed reactor is started to increase the external liquid phase circulation flow rate of the trickle bed reactor, including:

[0088] If the flow rate is lower than the preset lower limit of the liquid phase feed flow rate, the liquid phase external circulation flow rate is adjusted according to the set value of the liquid phase external circulation flow rate of the trickle bed reactor after the liquid phase external circulation pump is started. The liquid flowing in the liquid phase external circulation is the reaction liquid (i.e., reactants) and some liquid phase feed.

[0089] If the current liquid phase feed flow rate is lower than the preset lower limit of the liquid phase feed flow rate, the liquid phase external circulation pump P01 of the trickle bed reactor is started, and the external circulation flow controller FIC-03 ​​adjusts the liquid phase external circulation flow rate FR of the reactor according to the set value of the liquid phase external circulation flow rate.

[0090] In some embodiments, the method further includes:

[0091] Obtain the current external liquid phase circulation flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design circulation temperature of the external liquid phase circulation of the trickle bed reactor;

[0092] The design circulation temperature refers to the temperature that the liquid in the external circulation phase can reach under the normal load specified by the manufacturer (i.e., to ensure the safety of the trickle bed reactor and to reach the maximum allowable load of the trickle bed reactor) after the reactor leaves the factory.

[0093] Design circulation temperature of liquid phase external circulation FR is the external circulation flow rate of the liquid phase, FLnormal is the design liquid phase feed flow rate, TRnormal is the design circulation temperature, and f is the parameter of the empirical mathematical model, which is obtained by fitting the known operating parameters.

[0094] Based on the current external liquid phase circulation flow rate, the designed liquid phase feed flow rate, and the designed circulation temperature of the external liquid phase circulation, determine the circulation temperature setpoint of the external liquid phase circulation.

[0095] Adjust the circulating temperature of the liquid phase external circulation of the trickle bed reactor according to the circulating temperature set value.

[0096] Changes in the external circulation volume of the reactor cause changes in the degree of backmixing of materials inside the reactor. It is necessary to adjust the setpoint of the external circulation material temperature controller TIC-01 (i.e., the circulation temperature setpoint). The external circulation material temperature controller TIC-01 adjusts the external circulation material temperature TR (i.e., the circulation temperature of the liquid phase external circulation) through the action TV1.

[0097] In some embodiments, adjusting the liquid feed flow rate of the trickle bed reactor according to the target load value includes:

[0098] Obtain the liquid feed flow rate setpoint corresponding to the target load value;

[0099] Obtain the adjustment range of the liquid phase feed in the trickle bed reactor;

[0100] With the liquid phase feed flow rate set as the target, the liquid phase feed flow rate is adjusted according to the adjustment range of the liquid phase feed.

[0101] By obtaining the set value of the liquid feed flow rate corresponding to the target load value and the adjustment range of the liquid feed, the liquid feed flow rate can be gradually adjusted according to the set value of the liquid feed flow rate and the adjustment range of the liquid feed, so as to avoid large process fluctuations during the load adjustment process.

[0102] Furthermore, to judge Figure 2 If the current measured values ​​of each control loop have all reached the set values ​​of the control loop at the current step (i.e., whether the gas phase feed flow rate of the trickle bed reactor has reached the set value of the gas phase feed flow rate of the trickle bed reactor, whether the cooling medium flow rate of the trickle bed reactor has reached the set value of the cooling medium flow rate, whether the cooling medium temperature of the trickle bed reactor has reached the set value of the cooling medium temperature, whether the liquid phase external circulation flow rate of the trickle bed reactor has reached the set value of the liquid phase external circulation flow rate, and whether the circulation temperature of the liquid phase external circulation of the trickle bed reactor has reached the set value of the circulation temperature), if not, continue automatic adjustment; if they have reached the set values, repeat the above adjustment steps and continue to adjust the set values ​​of each loop according to the adjustment step of the liquid phase feed until the liquid phase feed flow rate reaches the set value of the liquid phase feed flow rate.

[0103] The following will combine Figure 2 Further details of the technical solution disclosed herein:

[0104] Step 1: Manually set the target load value (percentage of normal load) of the trickle bed reactor according to production needs and input it into the intelligent control system. The intelligent control system increases or decreases the liquid feed flow rate controller FIC-01 setup according to the preset load gradient. FIC-01 adjusts the liquid feed flow rate FL through the action regulating valve FV1.

[0105] For example, if the liquid feed flow rate FLnormal (i.e., the design liquid feed flow rate) corresponding to the normal production load of the reactor is to reduce the reactor load to 80% (i.e., the target load value = 80% * normal production load), then the setting value of the liquid feed flow controller FIC-01, FIC-01setup, needs to be adjusted to 80% * FLnormal (i.e., the liquid feed flow rate setting value corresponding to the target load value is 80% * FLnormal).

[0106] However, to avoid significant process fluctuations during load adjustment, the load cannot be directly adjusted to the target value. Instead, the FIC-01setup value needs to be gradually adjusted according to a certain gradient until the target load is reached. The adjustment range for each step can be adjusted according to process requirements. It is recommended to adjust the load by a range of 2 to 5% of the normal load (i.e., the adjustment range).

[0107] Step 2: When the liquid phase feed flow controller FIC-01 setup is increased or decreased according to the recommended adjustment range, the reactor gas phase feed flow controller FIC-02 setup (i.e., the set value of the gas phase feed flow), the reactor cooling medium flow controller FIC-04 setup (i.e., the set value of the cooling medium flow), and the reactor cooling medium temperature controller TIC-02 setup (i.e., the set value of the cooling medium temperature) need to be adjusted synchronously according to the empirical mathematical model.

[0108] The gas phase feed flow controller FIC-02 adjusts the reactor gas phase feed rate FG by changing the self-circulation amount of the circulating hydrogen compressor C01 through the action of the regulating valve FV2; the reactor cooling medium flow controller FIC-04 adjusts the reactor cooling medium flow rate FW through the action of FV4; and the reactor cooling medium temperature controller TIC-02 adjusts the reactor cooling medium temperature TW through the action of TV2.

[0109] The empirical mathematical model is as follows:

[0110]

[0111]

[0112]

[0113] Wherein, FGnormal, FWnormal, and TWnormal are the process parameter values ​​of FG (i.e., design gas feed flow rate), FW (i.e., design cooling medium flow rate), and TW (i.e., design cooling medium temperature) under normal reactor load, respectively, and a, b, c, d, and e are the parameters of the empirical mathematical model, which are obtained by fitting based on the known operating parameters.

[0114] The PIC-01 is in automatic control mode and the set value (i.e., pressure set value) remains unchanged.

[0115] Step 3: The reactor liquid feed distributor has a minimum allowable flow rate limit Fallow (i.e., a preset lower limit for liquid feed flow rate). If the liquid feed flow rate FL (i.e., the current liquid feed flow rate) is lower than the lower limit Fallow, the external circulation pump P01 needs to be started. The external circulation flow controller FIC-03 ​​adjusts the reactor external circulation flow rate FR through action FV3. The calculation model for the setpoint FIC-03setup (i.e., the setpoint for the liquid external circulation flow rate) of the external circulation flow controller FIC-03 ​​is as follows:

[0116] FIC-03setup = the difference between Fallow and FIC-01setup (4)

[0117] Step 4: Changes in the external circulation volume of the reactor cause changes in the degree of backmixing of materials in the reactor. It is necessary to adjust the setting value of the external circulation material temperature controller TIC-01 (i.e., the circulation temperature setting value of the liquid phase external circulation). The external circulation material temperature controller TIC-01 adjusts the external circulation material temperature TR through the action TV1.

[0118]

[0119] Where TRnormal (i.e., the design circulation temperature of the liquid phase external circulation) is the process parameter value of TR under normal reactor load, and f is the parameter of the empirical mathematical model, which is obtained by fitting based on the known operating parameters.

[0120] Step 5: Determine whether the current measured values ​​of each control loop have all reached the control loop set value of the current step. If not, continue automatic adjustment; if they have, repeat the above steps 1 to 4, and continue to adjust the set values ​​of each loop according to the step until the liquid phase feed load reaches the target value of load adjustment.

[0121] Implementation Cases

[0122] This disclosure uses a hydrogenated trickle bed reactor as an example to illustrate the present disclosure.

[0123] Step 1: The trickle bed reactor is operating at 100% load. Now, according to production requirements, the load needs to be reduced to 60%. The target value for reactor load adjustment (i.e., the target load value is 60%) is input into the intelligent control system. The intelligent control system, according to the preset load increase / decrease gradient (5% normal load), first reduces the liquid phase raw material feed flow controller FIC-01 setting value FIC-01setup to 95% FLnormal.

[0124] Step 2: Based on the empirical mathematical model, synchronously adjust the settings of reactor gas feed flow controller FIC-02setup, reactor cooling medium flow controller FIC-04setup, and reactor cooling medium temperature controller TIC-02setup.

[0125] The intelligent control system collects the measured value of the liquid feed flow rate FL, and combines it with the process parameters FLnormal, FGnormal, FWnormal, and TWnormal (known process parameters) under normal load, and calculates the new setpoint of the controller based on an empirical mathematical model:

[0126]

[0127]

[0128]

[0129] Wherein, FGnormal, FWnormal, and TWnormal are the process parameter values ​​of FG, FW, and TW under normal reactor load (known process parameters).

[0130] The PIC-01 is in automatic control mode and the set value remains unchanged.

[0131] Step 3: The reactor liquid feed distributor has a minimum allowable flow rate limit Fallow (80% FLnormal). When the liquid feed flow rate FL is higher than Fallow (80% FLnormal), the external circulation pump P01 does not need to be started, and FIC-03 ​​and TIC-01 do not participate in the control. When the liquid feed flow rate FL drops stepwise to below the flow rate limit Fallow (80% FLnormal), the external circulation pump P01 is started. The external circulation flow controller FIC-03 ​​adjusts the reactor external circulation flow rate FR through action FV3. The calculation model of the setpoint of the external circulation flow controller FIC-03 ​​and FIC-01setup is as follows:

[0132] FIC-03setup = the difference between Fallow and FIC-01setup (4)

[0133] When FL drops to 75%FLnormal, the FIC-03setup setting is (80%-75%)FLnormal = 5%FLnormal.

[0134] Step 4: Changes in the external circulation volume of the reactor cause changes in the degree of backmixing of materials in the reactor. It is necessary to adjust the setting value of the external circulation material temperature controller TIC-01 (TIC-01setup). The external circulation material temperature controller TIC-01 adjusts the external circulation material temperature TR through the action TV1.

[0135]

[0136] Where TRnormal is the process parameter value of TR under normal reactor load (known process parameters).

[0137] Step 5: Determine whether the current measured values ​​of each control loop have all reached the control loop set value of the current step. If not, continue automatic adjustment; if they have, repeat the above steps 1 to 4 and continue to adjust the set values ​​of each loop according to the adjustment range until the liquid phase feed load reaches the target value of 60% of the load adjustment.

[0138] The above demonstrates that this solution can effectively adjust the reactor load during normal production. Different control strategies are adopted based on the adjustment range to ensure reactor reaction efficiency, avoid production fluctuations, and greatly improve production efficiency and product quality stability.

[0139] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this disclosure is not limited to the described order of actions, because according to this disclosure, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this disclosure.

[0140] The above is an introduction to the method embodiments. The following describes the solution described in this disclosure further through device embodiments.

[0141] Figure 3 A block diagram of a trickle bed reactor load control device 300 according to an embodiment of the present disclosure is shown. Figure 3 As shown, the device 300 includes:

[0142] The first acquisition module 310 is used to acquire the current target load value of the trickle bed reactor;

[0143] The first adjustment module 320 is used to adjust the liquid phase feed flow rate of the trickle bed reactor according to the load target value;

[0144] The second acquisition module 330 is used to acquire the current liquid phase feed flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design gas phase feed flow rate of the trickle bed reactor.

[0145] The determining module 340 is used to determine the set value of the gas phase feed flow rate of the trickle bed reactor based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed gas phase feed flow rate.

[0146] The second adjustment module 350 is used to adjust the gas phase feed flow rate of the trickle bed reactor according to the set value of the gas phase feed flow rate of the trickle bed reactor while adjusting the liquid phase feed flow rate.

[0147] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the described module can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0148] According to embodiments of the present disclosure, the present disclosure also provides an electronic device and a non-transitory computer-readable storage medium storing computer instructions.

[0149] Figure 4 A schematic block diagram of an electronic device 800 that can be used to implement embodiments of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present disclosure described and / or claimed herein.

[0150] Device 800 includes a computing unit 801, which can perform various appropriate actions and processes based on a computer program stored in read-only memory (ROM) 802 or a computer program loaded from storage unit 808 into random access memory (RAM) 803. RAM 803 may also store various programs and data required for the operation of device 800. The computing unit 801, ROM 802, and RAM 803 are interconnected via bus 804. Input / output (I / O) interface 805 is also connected to bus 804.

[0151] Multiple components in device 800 are connected to I / O interface 805, including: input unit 806, such as keyboard, mouse, etc.; output unit 807, such as various types of monitors, speakers, etc.; storage unit 808, such as disk, optical disk, etc.; and communication unit 809, such as network card, modem, wireless transceiver, etc. Communication unit 809 allows device 800 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0152] The computing unit 801 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 801 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 801 performs the various methods and processes described above, such as method 100. For example, in some embodiments, method 100 may be implemented as a computer software program tangibly contained in a machine-readable medium, such as storage unit 808. In some embodiments, part or all of the computer program may be loaded and / or installed on device 800 via ROM 802 and / or communication unit 809. When the computer program is loaded into RAM 803 and executed by the computing unit 801, one or more steps of method 100 described above may be performed. Alternatively, in other embodiments, the computing unit 801 may be configured to perform method 100 by any other suitable means (e.g., by means of firmware).

[0153] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0154] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0155] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0156] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0157] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as a data server), or computing systems that include middleware components (e.g., an application server), or computing systems that include frontend components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with embodiments of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., a communication network). Examples of communication networks include local area networks (LANs), wide area networks (WANs), and the Internet.

[0158] Computing systems can include clients and servers. Clients and servers are generally located far apart and typically interact via communication networks. Client-server relationships are created by computer programs running on the respective computers and having a client-server relationship with each other. Servers can be cloud servers, servers in distributed systems, or servers incorporating blockchain technology.

[0159] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this is not limited herein.

[0160] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A method for load control in a trickle bed reactor, characterized in that, include: Obtain the current target load value of the trickle bed reactor; Adjust the liquid feed flow rate of the trickle bed reactor according to the target load value; Obtain the current liquid phase feed flow rate, the design liquid phase feed flow rate, and the design gas phase feed flow rate of the trickle bed reactor; The set value of the gas phase feed flow rate of the trickle bed reactor is determined based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed gas phase feed flow rate. While adjusting the liquid phase feed flow rate, the gas phase feed flow rate of the trickle bed reactor is also adjusted according to the set value of the gas phase feed flow rate of the trickle bed reactor.

2. The method according to claim 1, characterized in that, The method further includes: Obtain the current liquid phase feed flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design cooling medium flow rate of the trickle bed reactor; The set value of the cooling medium flow rate of the trickle bed reactor is determined based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed cooling medium flow rate. While adjusting the liquid feed flow rate, the cooling medium flow rate of the trickle bed reactor is adjusted according to the set value of the cooling medium flow rate.

3. The method according to claim 1, characterized in that, The method further includes: Obtain the current liquid phase feed flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design cooling medium temperature of the trickle bed reactor; The set value of the cooling medium temperature of the trickle bed reactor is determined based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed cooling medium temperature. While adjusting the liquid feed flow rate, the cooling medium temperature of the trickle bed reactor is adjusted according to the set value of the cooling medium temperature.

4. The method according to claim 1, characterized in that, The method further includes: Determine whether the current liquid phase feed flow rate is lower than the preset lower limit of the liquid phase feed flow rate; If the flow rate is lower than the preset lower limit of the liquid phase feed flow rate, the external circulation pump of the trickle bed reactor will be started to increase the external circulation flow rate of the liquid phase in the trickle bed reactor.

5. The method according to claim 4, characterized in that, The method further includes: Obtain the current liquid phase feed flow rate setpoint of the trickle bed reactor; Calculate the flow difference between the preset lower limit of liquid phase feed flow rate and the current set value of liquid phase feed flow rate; The flow difference is determined as the set value of the external circulation flow rate of the liquid phase in the trickle bed reactor; If the flow rate is below the preset lower limit of the liquid phase feed rate, the external liquid phase circulation pump of the trickle bed reactor is started to increase the external liquid phase circulation flow rate of the trickle bed reactor, including: If the flow rate is lower than the preset lower limit of the liquid phase feed flow rate, then after starting the liquid phase external circulation pump, the liquid phase external circulation flow rate is adjusted according to the set value of the liquid phase external circulation flow rate of the trickle bed reactor.

6. The method according to claim 4, characterized in that, The method further includes: Obtain the current external liquid phase circulation flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design circulation temperature of the external liquid phase circulation of the trickle bed reactor; The set value of the circulation temperature of the liquid phase external circulation is determined based on the current liquid phase external circulation flow rate, the designed liquid phase feed flow rate, and the designed circulation temperature of the liquid phase external circulation. Adjust the circulating temperature of the liquid phase external circulation of the trickle bed reactor according to the circulating temperature set value.

7. The method according to any one of claims 1 to 6, characterized in that, Adjusting the liquid feed flow rate of the trickle bed reactor according to the stated load target value includes: Obtain the liquid feed flow rate setpoint corresponding to the target load value; Obtain the adjustment range of the liquid phase feed in the trickle bed reactor; With the liquid phase feed flow rate set as the target, the liquid phase feed flow rate is adjusted according to the adjustment range of the liquid phase feed.

8. A load control device for a trickle bed reactor, characterized in that, include: The first acquisition module is used to acquire the current target load value of the trickle bed reactor; The first adjustment module is used to adjust the liquid phase feed flow rate of the trickle bed reactor according to the load target value; The second acquisition module is used to acquire the current liquid phase feed flow rate of the trickle bed reactor, the design liquid phase feed flow rate of the trickle bed reactor, and the design gas phase feed flow rate of the trickle bed reactor; The determination module is used to determine the set value of the gas phase feed flow rate of the trickle bed reactor based on the current liquid phase feed flow rate, the designed liquid phase feed flow rate, and the designed gas phase feed flow rate. The second adjustment module is used to adjust the gas phase feed flow rate of the trickle bed reactor according to the set value of the gas phase feed flow rate of the trickle bed reactor while adjusting the liquid phase feed flow rate.

9. An electronic device, 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 enable the at least one processor to perform the method of any one of claims 1-7.

10. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-7.

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