An APC-steam temperature and pressure compensation method, system, device and medium

Abstract

The application discloses an APC-steam temperature and pressure compensation method, system, device and medium, and is applied to the field of process control. The APC-steam temperature and pressure compensation method provided by the application combines advanced process control and temperature and pressure compensation, respectively acquires a steam flow control value and a steam flow compensation value according to a liquid level in a fractionating tower, steam parameters and steam standard parameters in the fractionating tower in real time, and determines a steam flow regulation value together, so that the steam flow of the fractionating tower is automatically regulated in real time. The method not only avoids frequent manual regulation, but also avoids the phenomenon of control hysteresis caused by manual regulation after the liquid level fluctuation is found, realizes the regulation measure before the liquid level fluctuation occurs, and thus avoids the system fluctuation. The APC-steam temperature and pressure compensation system, device and medium provided by the application have the same beneficial effects.

Description

Technical Field

[0001] This application relates to the field of process control, and in particular to an APC-steam temperature and pressure compensation method, system, device, and medium. Background Technology

[0002] Fractionating towers are widely used in the petroleum refining industry. In the petroleum refining enterprise's wax oil hydrogenation process, the main process flow of the fractionating tower is as follows: Figure 1 As shown, where: L is the liquid level, T 汽 F represents the steam temperature. 汽 P is the steam flow rate. 汽 The steam pressure is used. The material produced in the upstream production process is sent to the fractionation tower. The bottom of the fractionation tower is heated by steam. Qualified aviation kerosene and diesel products are drawn out from the side stream. Part of the top is refluxed, and part is used to produce naphtha products. Part of the liquid phase at the bottom of the tower is sent to the tank area and downstream processes, and part is returned to the upstream processes for recycling.

[0003] In a fractionation tower control system, ideally, all parameters are constant, the feed and discharge are equal, and the fractionation tower is in equilibrium. However, due to significant fluctuations in the temperature and pressure of the steam at the bottom of the tower caused by heat exchange in upstream processes and heat losses during transmission, the calorific value of the steam entering the fractionation tower fluctuates greatly, disrupting the equilibrium and leading to reduced control effectiveness and poor product quality. Furthermore, fluctuations in feed flow rate also cause changes in the liquid level and temperature of the fractionation tower. Therefore, the control of the fractionation tower is very complex and its control effect is poor. Moreover, since the total thermal output of steam is invisible and uncontrollable to operators, only the steam flow rate is visible and controllable. Therefore, operators need to frequently adjust the steam flow rate; otherwise, significant fluctuations in the temperature and liquid level of the fractionation tower will occur.

[0004] The current control method for the fractionation tower involves the monitoring system detecting fluctuations in the liquid level, followed by operators adjusting the steam injection rate based on experience. However, this reactive approach inevitably leads to significant control lag.

[0005] How to address the impact of steam parameter variations on the fractionation tower system is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this application is to provide an APC-steam temperature and pressure compensation method, system, device, and medium to address the impact of steam parameter variations on a fractionation tower system.

[0007] To address the aforementioned technical problems, this application provides an APC-steam temperature and pressure compensation method, comprising:

[0008] acquiring a current distillation column liquid level and a current steam parameter in the distillation column collected by a sensor;

[0009] calling an APC model to obtain a steam flow control value output by the APC model according to the distillation column liquid level;

[0010] obtaining a steam flow compensation value according to the current steam parameter and a steam standard parameter of the current device;

[0011] determining a steam flow adjustment value according to the steam flow control value and the steam flow compensation value;

[0012] adjusting the steam flow of the distillation column according to the steam flow adjustment value.

[0013] Preferably, during commissioning and removal of the APC controller, the steam flow control value is determined as the output of the APC model according to a determined relationship among the steam flow compensation value, the steam flow control value and the steam flow adjustment value.

[0014] Preferably, determining the steam flow adjustment value according to the steam flow control value and the steam flow compensation value comprises:

[0015] obtaining a sum of the steam flow control value and the steam flow compensation value.

[0016] Preferably, the steam parameter comprises a steam temperature and a steam pressure, and the steam standard parameter comprises a steam standard flow, a steam standard temperature and a steam standard pressure.

[0017] Preferably, obtaining the steam flow compensation value according to the steam parameter and the steam standard parameter of the current device comprises:

[0018] obtaining a temperature deviation ratio according to the steam temperature and the steam standard temperature;

[0019] obtaining a pressure deviation ratio according to the steam pressure and the steam standard pressure;

[0020] obtaining a gas pressure difference compensation coefficient according to the temperature deviation ratio and the pressure deviation ratio;

[0021] obtaining the steam flow compensation value according to the steam standard flow and the gas pressure difference compensation coefficient.

[0022] Preferably, adjusting the distillation column according to the steam flow adjustment value comprises adjusting the distillation column through a DCS system according to the steam flow adjustment value.

[0023] Preferably, adjusting the steam flow of the distillation column according to the steam flow adjustment value comprises:

[0024] determining whether the current steam flow adjustment value is greater than a first preset value;

[0025] If yes, the current steam flow adjustment value is adjusted to a first preset value;

[0026] If no, it is determined whether the maximum of the absolute value of the difference between the current steam flow adjustment value and the steam flow value within the preset time is greater than a second preset value;

[0027] If yes, the steam flow adjustment value is adjusted to 0;

[0028] The current steam flow is controlled to be the sum of the last period steam flow and the steam flow adjustment value.

[0029] To solve the above technical problems, the application further provides an APC-steam temperature and pressure compensation system, comprising:

[0030] A first acquisition module is configured to acquire a fractionating tower liquid level and a steam parameter in a fractionating tower collected by a sensor;

[0031] A second acquisition module is configured to call an APC model and acquire a steam flow control value output by the APC model according to the fractionating tower liquid level;

[0032] A third acquisition module is configured to acquire a steam flow compensation value through the steam parameter and a steam standard parameter of a current device;

[0033] A determination module is configured to determine a steam flow adjustment value according to the steam flow control value and the steam flow compensation value;

[0034] An adjustment module is configured to adjust a steam flow of the fractionating tower through the steam flow adjustment value.

[0035] To solve the above technical problems, the application further provides an APC-steam temperature and pressure compensation device, comprising a memory configured to store a computer program;

[0036] A processor is configured to implement the steps of the APC-steam temperature and pressure compensation method when executing the computer program.

[0037] To solve the above technical problems, the application further provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the APC-steam temperature and pressure compensation method.

[0038] The APC-steam temperature and pressure compensation method provided in the application combines advanced process control with temperature and pressure compensation, respectively acquires a steam flow control value and a steam flow compensation value according to a liquid level in the fractionating tower, steam parameters and steam standard parameters in the fractionating tower in real time, and determines a steam flow adjustment value together, so as to realize real-time automatic adjustment of the steam flow of the fractionating tower, avoid frequent manual adjustment, avoid the phenomenon of control hysteresis caused by manual adjustment after the liquid level fluctuation is found, realize the adjustment measure before the liquid level fluctuation occurs, and thus avoid the system fluctuation.

[0039] The APC-steam temperature and pressure compensation system, device and medium provided in the application have the same advantages as above. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application,

[0041] For those skilled in the art, other drawings can be obtained according to the drawings without creative labor.

[0042] Figure 1 The main process flow diagram of the fractionating tower in the petroleum refining enterprise-wax oil hydrogenation production process provided in the application is shown in the figure.

[0043] Figure 2 The APC-steam temperature and pressure compensation method flowchart provided in the application is shown in the figure.

[0044] Figure 3 The steam flow cumulative writing method flowchart provided in the application is shown in the figure.

[0045] Figure 4 The APC-steam temperature and pressure compensation method actual application flowchart provided in the application is shown in the figure.

[0046] Figure 5 The APC-steam temperature and pressure compensation system schematic diagram provided in the application is shown in the figure.

[0047] Figure 6 The APC-steam temperature and pressure compensation device structural schematic diagram provided in the application is shown in the figure. DETAILED DESCRIPTION

[0048] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0049] The core of the present application is to provide an APC-steam temperature and pressure compensation method, system, device and medium, which is used to solve the influence of steam parameter change on the fractionating column system.

[0050] In order to enable the person skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0051] The present application provides an APC-steam temperature and pressure compensation method, as shown in Figure 2 Figure 2 The APC-steam temperature and pressure compensation method provided by the present application is shown in the flowchart, and the method comprises the following steps.

[0052] S10: acquiring the fractionating column liquid level and steam parameters currently collected by the sensor in the fractionating column.

[0053] The fractionating column is the most widely used device for material separation in modern industry. Different boiling point materials are mixed and then enter the fractionating column, and are evaporated and rise after being heated at the bottom of the fractionating column. With the increase of the tower layer, the temperature in the tower gradually decreases, so that the materials evaporated from the bottom of the fractionating column are condensed at different tower layers of the fractionating column, and are separated by different means, so as to separate and purify different materials in the mixed materials. The fractionating column liquid level and steam parameters are acquired in real time by the sensors in the fractionating column. The sensors are multiple and correspond to different parameters, wherein the steam

[0054] The parameters usually include steam temperature, steam pressure, etc. The type of the sensor is not limited in the present application.

[0055] S11: calling the APC model, and acquiring the steam flow control value output by the APC model according to the fractionating column liquid level.

[0056] ​Advanced process control (APC) system is established on the basis of conventional proportional integral derivative (PID) control system, which is not a single control strategy, but a general term for those control strategies different from conventional single loop control and having better effect than conventional PID control loop. For example: model predictive control, expert system, neural network and other control strategies can be called advanced process control. Its core content mainly includes: data acquisition, establishment of mathematical model, controller design, online operation monitoring and soft measurement, etc. The development of APC technology in China has been relatively mature, and many domestic enterprises have complete APC technology, which is completely packaged into software. In the APC control system, the control model of the control variable and the controlled variable is:

[0057] L(s)-L s =G(S)*(F(s)-F s )

[0058] L(s)=G(S)*F(s)+L0

[0059] L0=L(s)-G(S)*F(s)

[0060] Wherein: F s is the steady state value of the control variable, L s is the steady state value of the controlled variable, G(S) is the function of the control model, F(s) is the real-time value of the control variable, L(s) is the real-time value of the controlled variable, and L0 is the steady state deviation of the controlled variable.

[0061] Its impulse response model is:

[0062]

[0063] Wherein: L (t) is the value of the controlled variable at time t, F (t-i) is the value of the control variable at time t-i, g i is the impulse response, N is the length of the model, t is the time, and i is a non-negative integer.

[0064] The step response model is:

[0065]

[0066] Wherein: a i represents the step response of the process, and satisfies g j is the impulse response, j is a non-negative integer, and ΔF (t-i) is the change of the control variable at time t-i.

[0067] Its dynamic control matrix equation can be expressed as:

[0068]

[0069] When the system gives a control target value:

[0070]

[0071] Wherein: L (t+p|t) is the prediction value of the controlled variable after p time at t time when the control variable is assumed to remain unchanged; one L (0) is a L0 component; minV(ΔF(t),...,ΔF(t+M-1)) is a control constraint; V is a variable set of the control variable; ΔF(t) is the change amount of the control variable at t time; p is a prediction time domain; M is a control time domain; q is a weight matrix of the prediction error; r is a weight matrix of the control action; L r (t+i) is the output reference value at t+i time; is the closed-loop output prediction value under the control action.

[0072] It is obtained that:

[0073]

[0074] Wherein, ΔF M (t) is the change amount of the control variable at t time in the control time domain, L r (t) is the output reference value at t time.

[0075] Thus, the optimal solution of ΔU * M (t) is obtained as:

[0076]

[0077] Wherein, ΔU * M (t) is the optimal solution of the control variable, D is a dynamic matrix, D T is the transpose matrix of D, R is an R matrix, Q is a weight matrix of the prediction error, is the open-loop output prediction value at the initial time.

[0078] By calling the APC model established above, the distillation column liquid level is taken as the input of the model, and the steam flow control value output by the APC model is obtained.

[0079] S12: Obtain the steam flow compensation value by the current steam parameter and the steam standard parameter of the current equipment.

[0080] The steam parameters in the embodiments of the present application are not limited, and generally include steam temperature and steam pressure. The steam standard parameters in the embodiments of the present application are also not limited, and generally include standard flow, standard temperature and standard pressure. Based on the above parameters, the steam flow compensation value is obtained according to a preset formula relationship.

[0081] S13: determining a steam flow adjustment value according to the steam flow control value and the steam flow compensation value.

[0082] The steam flow adjustment value is determined according to the steam flow control value and the steam flow compensation value obtained according to the above steps, and the steam flow adjustment value is the actual flow entering the fractionating tower.

[0083] S14: adjusting the steam flow of the fractionating tower through the steam flow adjustment value.

[0084] The steam flow in the fractionating tower is adjusted through the steam flow adjustment value controlling the actual flow entering the fractionating tower.

[0085] The APC-steam temperature and pressure compensation method provided in the embodiments of the present application combines advanced process control with temperature and pressure compensation, and real-time steam flow control values and steam flow compensation values are obtained according to the fractionating tower liquid level in the fractionating tower, steam parameters and steam standard parameters, respectively, to jointly determine a steam flow adjustment value, so as to realize real-time automatic adjustment of the steam flow of the fractionating tower. Not only is the frequent manual adjustment avoided, but also the phenomenon of control hysteresis caused by manual adjustment after the liquid level fluctuation is avoided, and adjustment measures are taken before the liquid level fluctuation occurs, so that the system fluctuation is avoided.

[0086] Considering that the APC system will be closed in special cases, that is, the APC model stops outputting, at this time, the APC model output is A. When the APC system is started again, at this time, the steam flow is B, but the APC model output is still A, then the steam flow will have a step change from B to A. When B and A are quite different, the step change from B to A will directly destroy the stable operation of the fractionating tower system, and seriously affect the safe production of the device. To solve the above problem, as a kind of optimization, in the process of putting into use and cutting off the APC controller, the steam flow control value is determined as the output of the APC model according to the determination relationship among the steam flow compensation value, the steam flow control value and the steam flow adjustment value.

[0087] Steam flow compensation value F 补偿 is real-time, that is, F 补偿 always exists, F 控 exists only when the controller is in operation. When the controller is in operation, if the steam flow relationship is: F 调 =F 控 +F 补偿 , that is, the steam flow control value F 控and the steam flow compensation value determines the steam flow adjustment value F 调 The steam flow control value determined reversely is: F 控 =F 调 -F 补偿 Therefore, when the controller is closed, F 控 =F 调 -F 补偿 is assigned to the output of the controller, so that the controller output changes with the actual output, and the relationship of F 调 =F 控 +F 补偿 is maintained at all times.

[0088] The APC-steam temperature and pressure compensation method provided in the embodiments of the present application can ensure that the steam flow control value of the output of the APC model is always equal to the actual steam flow adjustment value after compensation by the steam flow compensation value at the time of commissioning and removal of the APC system, so that the step phenomenon of the steam flow during the commissioning and removal of the APC system is avoided, and the purpose of smooth transition, i.e., disturbance-free switching, is achieved.

[0089] Based on the above embodiments, as a preferred embodiment, the steam flow adjustment value is determined by the steam flow control value and the steam flow compensation value, which includes:

[0090] The sum of the steam flow control value and the steam flow compensation value is obtained.

[0091] In the APC controller, the model of the controller is established under the condition that the temperature and pressure of the steam are stable. Therefore, the steam flow output value of the controller is the flow calculated under the standard condition, i.e., the ideal steam flow. However, due to the change of the temperature and pressure of the actual steam, the thermal total value of the actual steam flow is not equal to the thermal total value of the theoretical steam output by the controller. At this time, the actual flow of the steam entering the fractionating tower should be the sum of the steam flow output by the controller and the compensation flow F 补偿 caused by the heat loss part of the steam parameter change, i.e.,

[0092] F 调 =F 控 +F 补偿

[0093] wherein F 调 is the steam flow adjustment value of the steam entering the fractionating tower, F 控 is the steam flow control value output by the controller according to the deviation, and F 补偿 is the steam flow compensation value of the heat loss part caused by the change of the steam parameter.

[0094] The embodiment of the application limits to determine the steam flow adjustment value by obtaining the sum of the steam flow control value and the steam flow compensation value, and the calculation method is simple.

[0095] Based on the above embodiment, as a preferred, the steam parameters include: steam temperature, steam pressure; the steam standard parameters include steam standard flow, steam standard temperature, steam standard pressure.

[0096] The heat value of steam is closely related to its temperature and pressure, the temperature and pressure compensation of steam is based on the steam temperature and steam pressure change to obtain the steam flow compensation value, and compensate the heat loss caused by the temperature and pressure change, and the steam temperature and steam pressure can be obtained through the corresponding sensor. According to the design of the fractionating tower, the standard flow, the standard temperature and the standard pressure are determined by the experience of the operators for many years, that is, the steam flow, the steam temperature and the steam pressure under the ideal production condition.

[0097] The embodiment of the application limits the steam parameters and the steam standard parameters, the obtaining method of the steam temperature and the steam pressure is simple, and the standard flow, the standard temperature and the standard pressure are the ideal condition values determined by the experienced operators, so as to ensure the reliability of the subsequent obtained steam flow compensation value.

[0098] Based on the above embodiment, as a preferred, the steam flow compensation value is obtained by the steam parameters and the steam standard parameters of the current device, including:

[0099] From the previous research, the gas mass of the differential pressure sensor is:

[0100]

[0101] Wherein: Q m is the gas mass, Q max is the maximum value of the gas mass, ΔP is the pressure change, ΔP max is the maximum value of the pressure change, ρ is the current gas density, ρ s is the gas density under the design state.

[0102] And The gas volume is proportional to its temperature and inversely proportional to its pressure. It can be solved that:

[0103]

[0104] Wherein: P s and T s are the ideal pressure and ideal temperature under the design state, P A and T B are the standard pressure and standard temperature, P and T are the current pressure and current temperature.

[0105] According to the steam temperature and the steam standard temperature, the temperature deviation ratio is obtained.

[0106] The real-time temperature deviation ratio is defined as:

[0107]

[0108] Wherein, K T is the temperature deviation ratio, T 标 is the steam standard temperature, T 时 is the real-time temperature, T n is absolute zero, 273°.

[0109] According to the steam pressure and the steam standard pressure, the pressure deviation ratio is obtained.

[0110] The pressure deviation ratio is:

[0111]

[0112] Wherein, K P is the pressure deviation ratio, P 标 is the steam standard pressure, P 时 is the real-time pressure, P n is the absolute pressure, indicating 101kPa, that is, one standard atmospheric pressure.

[0113] According to the temperature deviation ratio and the pressure deviation ratio, the gas pressure difference compensation coefficient is obtained.

[0114] In general gas, assuming that the gas quality is constant, the pressure is constant, then the higher the temperature of the gas, the higher the total amount of heat contained. Assuming that the gas quality is constant, the temperature is constant, then the greater the pressure, that is, the greater the density, the higher the heat value contained.

[0115] Let the compensation coefficient be β, and the gas pressure difference compensation coefficient:

[0116]

[0117] According to the steam standard flow and the gas pressure difference compensation coefficient, the steam flow compensation value is obtained.

[0118] The steam flow compensation value is:

[0119] F 补偿 = F 标 (β-1)

[0120] The embodiments of the present application limit how to obtain the temperature deviation ratio, the pressure deviation ratio, the gas pressure difference compensation coefficient and the steam flow compensation value in the form of formula derivation, to ensure that the steam flow compensation value is based on, to ensure that the subsequent more accurate steam flow adjustment value is determined.

[0121] As a preferred embodiment of this application, adjusting the fractionation tower according to the steam flow rate adjustment value includes: adjusting the fractionation tower through a DCS system according to the steam flow rate adjustment value.

[0122] A distributed control system (DCS) is an instrument control system designed with the concept of decentralized control, centralized management, and operation. Through DCS system configuration technology, auxiliary variables and operating interfaces are established within the DCS system for human-machine interaction.

[0123] The embodiments of this application specify the use of a DCS system to regulate the fractionation tower. This system can realize decentralized control, centralized management and operation of APC and steam temperature and pressure compensation.

[0124] The characteristic of a fractionation tower is that it utilizes a bottom heat source for heating, creating multi-stage temperature differences within the tower. This allows for material separation based on the different boiling points of the materials (this technology is applied in the fractionation tower of the Yunnan Petrochemical wax oil unit for the separation and purification of naphtha, jet fuel, and diesel). Therefore, excessive or frequent adjustments to the steam flow rate can lead to large fluctuations in the multi-stage temperature differences within the fractionation tower, severely affecting material separation and stable operation. This application's embodiment, as a preferred method, addresses the above problem by using a cumulative steam flow rate adjustment method. Adjusting the steam flow rate of the fractionation tower based on the steam flow rate adjustment value includes:

[0125] Determine whether the current steam flow rate adjustment value is greater than the first preset value;

[0126] If so, adjust the current steam flow rate adjustment value to the first preset value;

[0127] If not, determine whether the maximum absolute value of the difference between the current steam flow rate adjustment value and the steam flow rate value within the preset time is greater than the second preset value;

[0128] If it is greater than 0, adjust the steam flow rate adjustment value to 0.

[0129] The current steam flow rate is controlled to be the sum of the steam flow rate of the previous cycle and the steam flow rate adjustment value.

[0130] For example, such as Figure 3 As shown, Figure 3 This application provides a flowchart of a method for accumulating steam flow rate values. The first preset value is 0.02, and the second preset value is 0.1. The increase or decrease in steam flow rate per control cycle (15s) is controlled by limiting the maximum steam adjustment to 0.02 t / h, i.e., limiting the maximum increase or decrease within 100s to 0.1 t / h. This is achieved by determining the steam flow rate adjustment value F. 调 Is the difference between the minimum steam flow rate within 100 seconds and the maximum steam flow rate within 100 seconds greater than 0.1 t / h? 调whether the difference is greater than 0.1 t / h to determine whether the maximum absolute value of the difference between the current steam flow adjustment value and the steam flow value in the preset time is greater than 0.1 t / h. That is, when the steam flow change amount output by the controller exceeds 0.02 t / h in each control period, the actual control change amount is 0.02 t / h; when the amount of steam increase or decrease reaches 0.1 t / h within 100 s, the controller will still continue to increase or decrease, and the controller will limit the increase or decrease, so that the increase or decrease is not allowed until the limitation is cancelled. The flow chart of the APC-steam temperature and pressure compensation method in actual application is shown in Figure 4 , Figure 4 The APC-steam temperature and pressure compensation method provided in the embodiment of the application is an actual application flow chart.

[0131] The embodiment of the application limits the adjustment speed of the steam flow by the steam flow cumulative writing method to prevent the running state of the fractionating tower system from being suddenly changed.

[0132] In the above embodiment, the APC-steam temperature and pressure compensation method is described in detail, and the embodiment of the corresponding APC-steam temperature and pressure compensation device is also provided. It should be noted that the embodiment of the device part is described from two angles, one is based on the functional module, and the other is based on the hardware.

[0133] Based on the functional module, as Figure 5 , Figure 5 The APC-steam temperature and pressure compensation system provided in the embodiment of the application is a schematic diagram, and the APC-steam temperature and pressure compensation system comprises:

[0134] The first acquisition module 10 is configured to acquire the fractionating tower liquid level and the steam parameter in the fractionating tower collected by the sensor;

[0135] The second acquisition module 11 is configured to call the APC model and acquire the steam flow control value output by the APC model according to the fractionating tower liquid level;

[0136] The third acquisition module 12 is configured to acquire the steam flow compensation value by the steam parameter and the steam standard parameter of the current device;

[0137] The determination module 13 is configured to determine the steam flow adjustment value according to the steam flow control value and the steam flow compensation value;

[0138] The adjustment module 14 is configured to adjust the steam flow of the fractionating tower by the steam flow adjustment value.

[0139] Since the embodiment of the system part corresponds to the embodiment of the method part, the embodiment of the system part is described with reference to the description of the embodiment of the method part, which is not described here.

[0140] From a hardware-based perspective, such as Figure 6 , Figure 6 Figure 1 is a structural schematic diagram of an APC-steam temperature and pressure compensation device provided by an embodiment of the present application. The APC-steam temperature and pressure compensation device comprises a memory 20 for storing a computer program.

[0141] A processor 21 is configured to execute the computer program to implement the steps of the method for APC-steam temperature and pressure compensation mentioned in the above embodiments.

[0142] The APC-steam temperature and pressure compensation device provided by the embodiment can include, but is not limited to, a smart phone, a tablet computer, a notebook computer, or a desktop computer, etc.

[0143] The processor 21 can include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 can be implemented in at least one of a hardware form of a Digital Signal Processor (DSP), a Field-Programmable Gate Array (FPGA), and a Programmable Logic Array (PLA). The processor 21 can also include a main processor and a coprocessor. The main processor is a processor for processing data in an awake state, also known as a Central Processing Unit (CPU). The coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 21 can be integrated with a Graphics Processing Unit (GPU) for rendering and drawing the content to be displayed by the display screen. In some embodiments, the processor 21 can further include an Artificial Intelligence (AI) processor for processing machine learning-related computing operations.

[0144] The memory 20 can include one or more computer-readable storage media that can be non-transitory. The memory 20 can also include high-speed random access memory and nonvolatile, computer-readable storage media such as one or more magnetic disk storage devices, flash memory devices. In this embodiment, the memory 20 is at least used to store the following computer program 201, wherein the computer program is loaded and executed by the processor 21, and can realize the related steps of the APC-steam temperature and pressure compensation method disclosed in any of the preceding embodiments. In addition, the resources stored by the memory 20 can also include an operating system 202 and data 203, etc., and the storage mode can be temporary storage or permanent storage. The operating system 202 can include Windows, Unix, Linux, etc. The data 203 can include but is not limited to steam parameters, etc.

[0145] In some embodiments, the APC-steam temperature and pressure compensation device can further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0146] Those skilled in the art can understand that the structure shown in the above embodiments does not constitute a limitation on the APC-steam temperature and pressure compensation device, and can include more or fewer components than those shown in the drawings. Figure 6

[0147] The APC-steam temperature and pressure compensation device provided by the embodiments of the present application includes a memory and a processor, and the processor can realize the following method when executing the program stored in the memory: the APC-steam temperature and pressure compensation method.

[0148] Finally, the present application also provides an embodiment of a computer-readable storage medium. The computer-readable storage medium stores a computer program, and the computer program is executed by the processor to realize the steps recorded in the above method embodiments.

[0149] It can be understood that if the method in the above embodiments is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and executes all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0150] ​The APC-steam temperature and pressure compensation method, system, device and medium provided by the present application are described in detail above. The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be understood by mutual reference. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be understood by referring to the method part. It should be pointed out that, for ordinary skilled persons in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0151] It should also be noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without further limitation, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. An APC-steam temperature and pressure compensation method, characterized by, The method comprises the following steps: acquiring the current distillation column liquid level and steam parameters collected by a sensor in a distillation column; calling an APC model, and acquiring a steam flow control value output by the APC model according to the distillation column liquid level; acquiring a steam flow compensation value through the steam parameters and steam standard parameters of equipment; determining a steam flow adjustment value according to the steam flow control value and the steam flow compensation value; adjusting the steam flow of the distillation column through the steam flow adjustment value, which comprises the following steps: determining whether the current steam flow adjustment value is greater than a first preset value; if yes, adjusting the current steam flow adjustment value to the first preset value; if no, determining whether the maximum value of the absolute value of the difference between the current steam flow adjustment value and the steam flow value within a preset time is greater than a second preset value; if yes, adjusting the steam flow adjustment value to 0; controlling the current steam flow to be the sum of the steam flow adjustment value and the steam flow of the last cycle.

2. The APC-steam temperature and pressure compensation method of claim 1, wherein, During the commissioning and removal of the APC controller, the steam flow control value is determined as the output of the APC model according to the determination relationship among the steam flow compensation value, the steam flow control value and the steam flow adjustment value.

3. The APC-steam temperature and pressure compensation method of claim 1, wherein, The determination of the steam flow adjustment value according to the steam flow control value and the steam flow compensation value comprises the following steps: acquiring the sum of the steam flow control value and the steam flow compensation value.

4. The APC-steam temperature and pressure compensation method of claim 1, wherein, The steam parameters comprise steam temperature and steam pressure, and the steam standard parameters comprise steam standard flow, steam standard temperature and steam standard pressure.

5. The APC-steam temperature and pressure compensation method of claim 4, wherein, The acquisition of the steam flow compensation value through the steam parameters and the steam standard parameters of equipment comprises the following steps: acquiring a temperature deviation ratio according to the steam temperature and the steam standard temperature; acquiring a pressure deviation ratio according to the steam pressure and the steam standard pressure; acquiring a gas pressure difference compensation coefficient according to the temperature deviation ratio and the pressure deviation ratio; acquiring the steam flow compensation value according to the steam standard flow and the gas pressure difference compensation coefficient.

6. The APC-steam temperature and pressure compensation method of claim 1, wherein, The adjustment of the steam flow of the distillation column according to the steam flow adjustment value comprises the following step:

7. An APC-steam temperature and pressure compensation system, characterized by, adjusting the distillation column through a DCS system according to the steam flow adjustment value. The method comprises the following steps: a first acquisition module is configured to acquire the current distillation column liquid level and steam parameters collected by a sensor in a distillation column; a second acquisition module is configured to call an APC model, and acquire a steam flow control value output by the APC model according to the distillation column liquid level; a third acquisition module is configured to acquire a steam flow compensation value through the steam parameters and steam standard parameters of equipment; a determination module is configured to determine a steam flow adjustment value according to the steam flow control value and the steam flow compensation value; an adjustment module is configured to adjust the steam flow of the distillation column through the steam flow adjustment value, which comprises the following step: determining whether the current steam flow adjustment value is greater than a first preset value. If yes, the current steam flow adjustment value is adjusted to a first preset value; if no, it is judged whether the maximum of the absolute value of the difference between the current steam flow adjustment value and the steam flow value within the preset time is greater than a second preset value; if yes, the steam flow adjustment value is adjusted to 0; and the current steam flow is controlled to be the sum of the steam flow of the last period and the steam flow adjustment value.

8. An APC-steam temperature and pressure compensating device, characterized by, The computer program is stored in the memory and comprises a plurality of instructions for causing the processor to perform the steps of the APC-steam temperature and pressure compensation method. The processor is configured to execute the computer program to implement the steps of the APC-steam temperature and pressure compensation method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer program is stored in the memory and comprises a plurality of instructions for causing the processor to perform the steps of the APC-steam temperature and pressure compensation method.

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