Intelligent split-flow purification control system for heat-stable salt in amine liquid system

Abstract

The invention relates to the technical field of petroleum refining and chemical separation, in particular to an intelligent split-flow purification control system for heat-stable salt in an amine liquid system, which comprises an amine liquid purification module, a heat-stable salt control module, a heat-stable salt control module, a heat-stable salt control module, a heat-stable salt control module, a heat-stable salt control module, a heat-stable salt control module, a heat-stable salt control module and a heat-stable salt control module, the flow distribution mechanism divides the flow direction of amine liquid into a main path and a branch path; the data acquisition module is used for acquiring process parameters of the amine liquid purification module during operation and sending the process parameters to the intelligent shunting calculation module; the intelligent split-flow calculation module is used for calculating the theoretical amine liquid flow of a split path according to the process operation parameters and the thermal stable salt target control value and sending the theoretical amine liquid flow to the intelligent split-flow control module; and the intelligent shunting control module is used for controlling a shunting mechanism to shunt the amine liquid according to the theoretical amine liquid flow of the shunt. Through the intelligent amine liquid shunting purification process, the treatment load of the heat-stable salt purification device is optimized, and the stability and economical efficiency of system operation are improved.

Description

Technical Field

[0001] This invention relates to the fields of petroleum refining and chemical separation technology, and in particular to an intelligent diversion and purification control system for thermally stable salts in an amine liquid system. Background Technology

[0002] Amine solutions are widely used in petrochemical, natural gas processing, and refining industries, primarily for absorbing and removing acidic components (such as H2S and CO2) from gases. By contacting acidic gases with amine solutions, soluble compounds are formed, achieving highly efficient removal of acidic gases and meeting environmental protection requirements in industrial production processes. Commonly used amines include ethanolamine, diethanolamine, and N-methyldiethanolamine. These amine solutions have high acidic gas absorption capabilities and can be recycled through regeneration systems.

[0003] In long-term operating amine liquid systems, the reaction between amine liquid and acidic gases not only generates acidic salts that can be removed through the regeneration process, but also forms heat-stable salts that are difficult to remove through conventional regeneration. The formation of these heat-stable salts is usually related to side reactions of the amine liquid and other impurities. As the system circulates and gradually accumulates, these heat-stable salts have various adverse effects on system operating efficiency, equipment safety, and energy consumption. The accumulation of heat-stable salts leads to a decrease in the absorption efficiency of the amine liquid, increased corrosivity, and the potential formation of deposits on equipment surfaces, further increasing the complexity and cost of equipment maintenance. Therefore, timely and effective removal of heat-stable salts is crucial to ensuring the long-term stable and efficient operation of the amine liquid system.

[0004] To control the content of heat-stable salts in amine solutions, various removal technologies have been developed and applied in industrial practice, such as distillation recovery, ion exchange, electrodialysis, adsorption, and membrane separation. These methods can remove heat-stable salts to a certain extent and extend the service life of the system. For example, patent CN201911041013.2 discloses a method and apparatus for purifying and removing heat-stable salts from amine solutions. Degraded, lean amine solution is drawn out before the amine solution inlet of the absorption tower, and then sequentially filtered to remove particulate matter, adsorbed to remove oil, and pretreated with alkali to obtain pretreated amine solution, which is then subjected to electrochemical treatment. The electrochemical treatment process automatically selects the treatment method based on the concentration of heat-stable salts in the amine solution. When the concentration of heat-stable salts is ≥3%, the electrochemical treatment only involves electrodialysis; when the concentration of heat-stable salts is <3%, the amine solution undergoes electroadsorption treatment. After the electrode adsorption is saturated, the pretreated amine solution is introduced to backwash and regenerate the electrode, and the electrode regenerated solution is then subjected to electrodialysis treatment.

[0005] In the process of purifying amine solutions to remove heat-stable salts, sending all the amine solution in the system to the purification unit for treatment can improve the removal efficiency, but it also significantly increases the load and energy consumption of the purification unit. When the heat-stable salt content in the amine solution is low, complete purification is unnecessary. However, when partial purification is adopted, existing systems cannot automatically adjust the treatment ratio of the purification unit according to changes in the properties of the amine solution and process operating parameters during actual production, which may lead to over-treatment or under-treatment, resulting in decreased system efficiency or increased operational risks. Furthermore, with prolonged operation of the purification unit, the heat-stable salt removal efficiency may decrease, and existing technologies lack a feedback adjustment scheme for changes in purification efficiency, thus affecting the overall operating performance of the amine solution system. Therefore, developing an intelligent diversion purification control method for the removal of heat-stable salts in amine solution systems is of positive significance for improving the overall operating efficiency of the amine solution system and ensuring the stable operation of the equipment. Summary of the Invention

[0006] In view of this, the present invention proposes an intelligent diversion and purification control system for heat-stable salts in an amine liquid system to solve the problems of high processing load in existing heat-stable salt purification systems in amine liquids and difficulty in dynamically adjusting the processing load of the device when process parameters fluctuate during production. Through an intelligent amine liquid diversion and purification process, the processing load of the heat-stable salt purification device is optimized, thereby improving the stability and economy of system operation.

[0007] The technical solution of this invention is implemented as follows: This invention provides an intelligent diversion and purification control system for heat-stable salts in an amine liquid system, including an amine liquid purification module, a data acquisition module, an intelligent diversion calculation module, and an intelligent diversion control module.

[0008] The amine liquid purification module is used to purify the amine liquid and remove the heat-stable salts from the amine liquid until the heat-stable salts in the amine liquid reach the preset target control value. The amine liquid purification module is equipped with a diversion mechanism, which divides the amine liquid flow into a main path and a branch path.

[0009] The data acquisition module is used to collect the process parameters of the amine liquid purification module and send the process parameters to the intelligent diversion calculation module;

[0010] The intelligent flow splitting calculation module is used to calculate the theoretical amine flow rate of the splitting based on process parameters and the target control value of the thermally stable salt, and then send the theoretical amine flow rate of the splitting to the intelligent flow splitting control module.

[0011] The intelligent diversion control module is used to control the diversion mechanism to divert the amine liquid according to the theoretical amine liquid flow rate of the diversion channel.

[0012] Based on the above technical solutions, preferably, the amine liquid purification module includes an input unit, a main channel, a branch channel, and a fusion unit. The main channel and the branch channel are connected in parallel. A heat-stable salt removal device is provided on the branch channel. The fusion unit is used to fuse the amine liquid output from the main channel and the branch channel and output it.

[0013] Based on the above technical solutions, preferably, the process parameters include the total flow rate of the amine solution, the content of thermally stable salts in the input amine solution, the content of thermally stable salts in the branch output amine solution, and the content of thermally stable salts in the final output amine solution.

[0014] Based on the above technical solutions, preferably, the data acquisition module and the amine purification module exchange data through MODBUS or OPC UA communication protocols to obtain the process parameters of the amine purification module.

[0015] Based on the above technical solutions, preferably, the execution process of the intelligent diversion and purification control system includes the following steps:

[0016] S1. Obtain the process parameters of the amine purification module through multiple sensors.

[0017] S2. Based on the preset target control value for thermally stable salt, the theoretical amine flow rate of the branch is calculated according to the process parameters.

[0018] S3. Determine the amine flow rates of the main path and branch paths based on the theoretical amine flow rates of the branch paths, and control the diversion mechanism to divert the amine flow according to the amine flow rates of the main path and branch paths.

[0019] Based on the above technical solutions, preferably, step S2 specifically includes: calculating the heat-stable salt removal efficiency of the branch based on the heat-stable salt content in the input amine solution and the heat-stable salt content in the branch output amine solution, and calculating the theoretical amine solution flow rate of the branch based on the heat-stable salt removal efficiency and the heat-stable salt target control value.

[0020] Based on the above technical solutions, the preferred formula for calculating the heat-stable salt removal efficiency of the branch circuit is:

[0021]

[0022] η is the heat-stable salt removal efficiency of the branch, %; C1 is the heat-stable salt content in the input amine solution, wt%; C2 is the heat-stable salt content in the output amine solution of the branch, wt%.

[0023] Based on the above technical solutions, preferably, the formula for calculating the theoretical amine flow rate of the branch circuit is as follows:

[0024]

[0025] Q2 is the theoretical amine flow rate of the branch, t / h; Q0 is the total amine flow rate, t / h; C1 is the content of thermally stable salts in the input amine solution, wt%; C0 is the target control value of thermally stable salts, wt%; η is the thermally stable salt removal efficiency of the branch, %.

[0026] Based on the above technical solutions, preferably, when the amine solution is ethanolamine or diethanolamine, the target control value of heat-stable salt is ≤4%; when the amine solution is N-methyldiethanolamine, the target control value of heat-stable salt is ≤2%.

[0027] Based on the above technical solution, preferably, step S3 further includes: performing a conditional judgment on the content of heat-stable salts in the final output amine solution, and determining whether to shut down the intelligent diversion and purification control system based on the conditional judgment result. The conditional judgment process is as follows:

[0028] When the data acquisition module detects that the thermally stable salt content in the final output amine solution meets the condition C3≤C0, the amine solution purification is stopped; otherwise, the amine solution purification continues. Here, C3 is the thermally stable salt content in the final output amine solution, and C0 is the target control value for thermally stable salts.

[0029] The intelligent diversion and purification control system for heat-stable salts in the amine liquid system of the present invention has the following advantages over the prior art:

[0030] (1) The intelligent diversion and purification control system for heat-stable salts in the amine liquid system provided by the present invention achieves precise control of the content of heat-stable salts in the amine liquid through real-time monitoring, intelligent calculation and automatic adjustment. The system is equipped with a diversion mechanism, which can dynamically adjust the diversion flow of the main road and the branch road according to the actual working conditions, optimize the processing load of the heat-stable salt purification device, improve the stability and economy of the system operation, reduce manual intervention, improve the level of automation, and effectively solve the problems of high processing load and difficulty in dynamic adjustment faced by the existing amine liquid purification system;

[0031] (2) The intelligent diversion calculation module adopted in this system dynamically calculates the theoretical amine flow rate of the branch by considering multiple key parameters (such as total amine flow rate, thermally stable salt content, target control value and removal efficiency, etc.), ensuring that the diversion flow rate is proportional to the actual demand, avoiding the problem of over-processing or under-processing, thereby optimizing energy consumption and improving the overall efficiency and economy of the system; at the same time, by monitoring the amine flow rate of the main road and the branch in real time, and automatically adjusting the amine diversion flow rate in the branch according to the difference between the calculated theoretical amine flow rate and the actual diversion flow rate, its closed-loop feedback control mechanism ensures that the system can quickly respond to changes in operating conditions and continuously optimize operating parameters, thereby improving the stability and control accuracy of the system, while also extending the equipment life and reducing maintenance costs;

[0032] (3) By setting different start and stop conditions and different target control values ​​for heat-stable salt according to different amine liquid types, this system achieves adaptive control for different working conditions and amine liquid characteristics, avoids frequent start and stop of the heat-stable salt purification device, enhances the flexibility and adaptability of the system, can effectively cope with process parameter fluctuations, and ensure that the system can maintain the best performance under various conditions. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a structural diagram of the intelligent diversion and purification control system of the present invention;

[0035] Figure 2 This is a flowchart illustrating the execution process of the intelligent diversion and purification control system of the present invention. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] like Figure 1 As shown, this invention provides an intelligent diversion and purification control system for heat-stable salts in an amine liquid system, including an amine liquid purification module, a data acquisition module, an intelligent diversion calculation module, an intelligent diversion control module, and a control module.

[0038] The amine liquid purification module is used to purify the amine liquid and remove the heat-stable salts from the amine liquid until the heat-stable salts in the amine liquid reach the preset target control value. The amine liquid purification module is equipped with a diversion mechanism, which divides the amine liquid flow into a main path and a branch path.

[0039] The data acquisition module is used to collect the process parameters of the amine liquid purification module and send the process parameters to the intelligent diversion calculation module;

[0040] The intelligent flow splitting calculation module is used to calculate the theoretical amine flow rate of the splitting based on process parameters and the target control value of the thermally stable salt, and then send the theoretical amine flow rate of the splitting to the intelligent flow splitting control module.

[0041] The intelligent diversion control module is used to control the diversion mechanism to divert the amine liquid according to the theoretical amine liquid flow rate of the diversion channel.

[0042] More preferably, the amine purification module includes an input unit, a main path, a branch path, and a fusion unit. The main path and the branch path are connected in parallel. A heat-stable salt removal device is provided on the branch path. The fusion unit is used to fuse the amine solutions output from the main path and the branch path and output them.

[0043] Specifically, the amine purification module is used to remove heat-stable salts from the amine solution to achieve amine purification. The input unit inputs the amine solution to be purified, and the intelligent diversion control module uses a diversion mechanism to separate a portion of the amine solution from the main path and send it to the heat-stable salt removal device in the branch path for removal. The removed amine solution is then fused with the amine solution from the main path in the fusion unit to obtain the final output amine solution, thereby achieving effective control of the heat-stable salt content in the entire amine solution system. The intelligent diversion purification control system provided by this invention achieves intelligent control by real-time monitoring of process parameters and dynamic calculation of the theoretical amine flow rate of the branch path, avoiding both under-processing and over-processing, thus improving the overall system operating efficiency. The diversion mechanism adjusts the amount of amine solution entering the heat-stable salt removal device according to actual needs, avoiding the high load and high energy consumption problems caused by full-process processing.

[0044] More preferably, the heat-stable salt removal device includes any one or more of the following: a distillation recovery device, an ion exchange device, an electrodialysis device, an adsorption device, and a membrane separation device.

[0045] More preferably, the process parameters acquired by the data acquisition module include the total amine flow rate, the content of thermally stable salts in the input amine solution, the content of thermally stable salts in the output amine solution from the branch lines, and the content of thermally stable salts in the final output amine solution. These process parameters can be real-time monitoring data or historical data. The data acquisition module and the amine purification module exchange data via MODBUS or OPC UA communication protocols to obtain the process parameters from the amine purification module. The data acquisition module includes multiple sensors, specifically flow meters for real-time monitoring of the amine flow rate in the main and branch lines, and a detection device for detecting the content of thermally stable salts in the amine solution.

[0046] Furthermore, the intelligent diversion control module includes a PID controller and control elements. A flow meter is used to monitor the amine flow rate of the main line and branch lines in real time. The PID controller executes the PID control algorithm. The control elements include regulating valves or pumps for adjusting the amine flow rate of the branch lines. The intelligent diversion control module receives the calculated theoretical amine flow rate of the branch lines from the intelligent diversion calculation module. Based on the real-time amine flow rate data of the branch lines monitored by the flow meter, it calculates the difference between the actual amine flow rate of the branch lines and the optimal flow rate. Using the PID control algorithm, it automatically calculates the required adjustment amount based on the deviation and adjusts the amine flow rate of the branch lines by adjusting the valve opening or the pump speed. It continuously monitors the adjustment effect, provides real-time feedback and adjustments, and determines whether the amine flow rate of the branch lines has reached the theoretical amine flow rate. If not, it continues to adjust.

[0047] Furthermore, the intelligent diversion control module is also equipped with an abnormal handling mechanism. When the heat-stabilized salt removal device is running at full load and still cannot meet the control requirements, an alarm will be triggered. For example, it can be set that the heat-stabilized salt removal efficiency of the branch is lower than a preset value (such as 40%), and manual intervention is allowed.

[0048] To avoid frequent system starts and stops and improve equipment lifespan, this invention further sets a start-up threshold for the intelligent diversion and purification control system. The system is activated only when the content of heat-stable salts in the input amine solution is too high; otherwise, it is not activated. Here, C1 ≥ C0 + a is considered an excessively high content of heat-stable salts in the input amine solution, where C1 is the content of heat-stable salts in the input amine solution, C0 is the target control value for heat-stable salts, and a is a buffer coefficient with a value of 0-0.5.

[0049] In this invention, by introducing a startup threshold (C1≥C0+a) instead of directly using the target control value C0, the system avoids frequent start-ups and shutdowns, improving equipment lifespan and reducing energy consumption. The buffer provided by the a value of 0-0.5 enhances system stability, avoiding unnecessary processing due to minor fluctuations. Simultaneously, this condition optimizes processing timing, ensuring processing only begins when the thermally stable salt content is sufficiently high, thus improving processing efficiency. Furthermore, the adjustability of the a value allows the system to adapt to different operating conditions and amine liquid characteristics, enhancing overall adaptability. This startup condition also improves economic efficiency by reducing unnecessary processing, achieving preventative control to prevent excessive accumulation of thermally stable salts, providing sufficient preheating and adjustment time for system startup, and facilitating long-term data analysis and optimization.

[0050] like Figure 2 As shown, the execution process of the intelligent diversion and purification control system in this invention includes the following steps:

[0051] S1. The process parameters of the amine liquid purification module are obtained through multiple sensors. Specifically, the sensors include flow meters for real-time monitoring of the amine liquid flow rate of the main line and branch lines, and detection devices for detecting the content of thermally stable salts in the amine liquid. Multiple detection devices and flow meters are provided.

[0052] S2. Based on the preset target control value for thermally stable salt, the theoretical amine flow rate of the branch is calculated according to the process parameters.

[0053] S3. Determine the amine flow rates of the main path and branch paths based on the theoretical amine flow rates of the branch paths, and control the diversion mechanism to divert the amine flow according to the amine flow rates of the main path and branch paths.

[0054] The intelligent diversion purification control system provided by this invention achieves intelligent control through three key steps. First, it acquires key process parameters in real time and accurately using multiple sensors, providing a reliable data foundation for subsequent calculations and control. Then, based on real-time operating conditions and target values, it dynamically calculates the theoretical amine flow rate of the diversion channel, ensuring the system operates in optimal condition. Finally, it precisely controls the diversion flow rate of the amine solution entering the diversion channel through a diversion mechanism to remove heat-stable salts from the amine solution, ensuring that the actual diversion flow rate matches the calculated optimal flow rate. This system achieves intelligent control, optimizes processing load, improves system efficiency, enhances adaptability and stability, while also improving economic efficiency, extending equipment lifespan, and bringing environmental benefits. Through automation and precise control, this system comprehensively optimizes the treatment process of heat-stable salts in the amine solution, significantly improving the overall system efficiency, economy, and stability.

[0055] Step S2 specifically includes: calculating the heat-stable salt removal efficiency of the branch based on the heat-stable salt content in the input amine solution and the heat-stable salt content in the branch output amine solution; and calculating the theoretical amine solution flow rate of the branch based on the heat-stable salt removal efficiency and the target control value of the heat-stable salt.

[0056] The formula for calculating the heat-stable salt removal efficiency of the branch is:

[0057]

[0058] η is the heat-stable salt removal efficiency of the branch, %; C1 is the heat-stable salt content in the input amine solution, wt%; C2 is the heat-stable salt content in the output amine solution of the branch, wt%.

[0059] The formula for calculating the theoretical amine flow rate of the branch circuit is:

[0060]

[0061] Q2 is the theoretical amine flow rate of the branch, t / h; Q0 is the total amine flow rate, t / h; C1 is the content of thermally stable salts in the input amine solution, wt%; C0 is the target control value of thermally stable salts, wt%; η is the thermally stable salt removal efficiency of the branch, %.

[0062] Specifically, the system first calculates the content of heat-stable salts in the amine solution before and after treatment by the heat-stable salt removal device to accurately assess the current performance of the device, taking into account the potential changes in the efficiency of the heat-stable salt removal device due to environmental factors such as time and amine type. Then, based on the heat-stable salt content (C1) in the input amine solution, the target control value (C0), the total amine flow rate (Q0), and the heat-stable salt removal efficiency (η) of each branch, the theoretical amine flow rate of the branch is calculated. This enables the system to dynamically adjust the branch flow rate according to real-time operating conditions, ensuring that the branch flow rate can be adjusted accordingly when the efficiency of the heat-stable salt removal device changes, maintaining optimal treatment results. The intelligent diversion purification control system provided by this invention avoids the problems of undertreatment or overtreatment that may occur with traditional fixed-ratio diversion, thereby improving the operating efficiency and stability of the entire amine purification system.

[0063] The target control value for heat-stable salts is related to the type of amine solution used and can be dynamically adjusted according to the operating conditions and corrosion status of the amine solution system. When the amine solution is ethanolamine or diethanolamine, the target control value for heat-stable salts is ≤4%; when the amine solution is N-methyldiethanolamine, the target control value for heat-stable salts is ≤2%.

[0064] Different types of amine solutions possess different chemical structures and properties. Ethanolamine and diethanolamine are primary and secondary amines, respectively, while N-methyldiethanolamine is a tertiary amine. These structural differences lead to variations in their formation mechanisms and reactivity with heat-stable salts. N-methyldiethanolamine generally exhibits better thermal stability than ethanolamine and diethanolamine, meaning it is less prone to decomposition or side reactions with other substances at high temperatures, thus forming fewer heat-stable salts. Therefore, a lower target for controlling the heat-stable salt content can be set for the N-methyldiethanolamine system.

[0065] Step S3 also includes: performing a conditional judgment on the content of heat-stable salts in the final output amine solution, and determining whether to shut down the intelligent diversion and purification control system based on the conditional judgment result. The conditional judgment process is as follows:

[0066] When the data acquisition module detects that the thermally stable salt content in the final output amine solution meets the condition C3≤C0, the amine solution purification is stopped; otherwise, the amine solution purification continues. Here, C3 is the thermally stable salt content in the final output amine solution, and C0 is the target control value for thermally stable salts.

[0067] In one embodiment, when using ethanolamine or diethanolamine as the absorbent, the content of heat-stable salts is recommended to be controlled at ≤4%. A target control value of 1.5% for heat-stable salts can be set. To avoid frequent start-stop of the heat-stable salt purification device, the amine purification module will not start when the data acquisition module detects that the content of heat-stable salts in the input amine solution is less than 2%; the amine purification module will start when the data acquisition module detects that the content of heat-stable salts in the input amine solution is greater than 2%. When the amine purification module starts, it automatically sets the initial value of the branch amine solution flow rate entering the heat-stable salt removal device, for example, 10% of the total flow rate. Then, based on the target control value of heat-stable salts and the content of heat-stable salts in the branch output amine solution, the theoretical amine solution flow rate of the branch is calculated through an intelligent flow calculation model. According to the actual branch amine solution flow rate calculation deviation, the branch amine solution flow rate entering the heat-stable salt removal device is adjusted by PID control until the content of heat-stable salts in the amine solution decreases to 1.5%, at which point the amine purification module stops.

[0068] In another embodiment, when using N-methyldiethanolamine as the absorbent, the content of heat-stable salts is recommended to be controlled at ≤2%. A target control value of 0.5% for heat-stable salts can be set. To avoid frequent start-stop of the heat-stable salt purification device, the amine purification module will not start when the data acquisition module detects that the content of heat-stable salts in the input amine solution is less than 1%; the amine purification module will start when the data acquisition module detects that the content of heat-stable salts in the input amine solution is greater than 1%. When the amine purification module starts, it automatically sets the initial value of the amine solution flow rate entering the heat-stable salt removal device, for example, 10% of the total flow rate. Then, based on the target control value of heat-stable salts and the content of heat-stable salts in the output amine solution, the theoretical amine solution flow rate of the branch is calculated through an intelligent flow calculation model. According to the actual deviation of the branch amine solution flow rate calculation, the branch amine solution flow rate entering the heat-stable salt removal device is adjusted by PID control until the content of heat-stable salts in the amine solution decreases to 0.5%, at which point the amine purification module stops.

[0069] Step S3 specifically includes: The intelligent diversion control module monitors the amine flow rate data of the main line and the branch line in real time through the flow meter. This data is transmitted to the intelligent diversion control module in real time through the MODBUS or OPC UA communication protocol. Based on the deviation between the calculated theoretical amine flow rate of the branch line and the actual amine flow rate of the branch line, the PID control algorithm is used to automatically adjust the amine flow rate of the branch line. The PID controller outputs the adjustment signal and sends it to the actuator (regulating valve or pump) on the branch line.

[0070] The flow rate regulation of the amine solution in each branch is achieved by installing regulating valves or pumps as control elements in the branch circuit. Based on the target flow rate set by the PID control algorithm, the valve opening or pump speed is adjusted in real time to regulate the flow rate of the amine solution in each branch circuit. After the actuator operates, the system continues to monitor the actual flow rate, forming a closed-loop control. If a deviation still exists, the above adjustment steps are repeated until the actual flow rate of the amine solution in each branch circuit reaches the target value.

[0071] It should be noted that throughout the adjustment process, the system continuously records changes in various process parameters and has an anomaly handling mechanism. For example, if the existing heat-stabilized salt treatment unit is operating at full load but still cannot meet the heat-stabilized salt control values, or if the removal efficiency of the heat-stabilized salt removal unit is below 40%, an alarm mechanism is triggered, sending an alert to notify manual intervention. This intelligent diversion and purification control method can effectively respond to changes in operating conditions, adjust the diversion flow rate of heat-stabilized salt removal and purification in the amine solution in real time, and ensure the safe, stable, and economical operation of the system.

[0072] The present invention will be further described in detail below with reference to specific embodiments, but the scope of protection of the present invention should not be limited by the following embodiments.

[0073] Example 1

[0074] The intelligent diversion and purification control process of thermally stable salts in the circulating hydrogen amine liquid desulfurization system of a certain residue oil hydrotreating unit is as follows:

[0075] The data acquisition module collects initial process parameters, finding the total input amine liquid flow rate to be 115 t / h and the heat-stable salt content in the input amine liquid to be 1.55%. The initial flow rate of the amine liquid entering the heat-stable salt removal device is set to 10% of the total flow rate, i.e., 11.5 t / h. After purification by the heat-stable salt removal device, the heat-stable salt content in the output amine liquid is detected to have decreased to 0.25%. The amine absorbent used is N-methyldiethanolamine solution, and the target control value for the heat-stable salt content in the amine liquid is set to 0.50%. Based on the target control value for the heat-stable salt content in the amine liquid, the intelligent diversion calculation module calculates the theoretical amine liquid flow rate of the diversion channel to be 92.9 t / h through data analysis. During the intelligent diversion control process, the system initializes the PID parameters and then executes a control loop, including reading the actual diversion amine liquid flow rate, calculating the deviation, using the PID algorithm to calculate the adjustment amount, sending the control signal, waiting for the system response, and repeating the adjustment until the error requirement is met.

[0076] After running for a period of time, the system operating conditions change. The data acquisition module collects the total flow rate of the input amine liquid as 120 t / h, the thermally stable salt content in the input amine liquid as 0.68%, and the thermally stable salt content in the output amine liquid as 0.14%. Under the condition that the target control value of the thermally stable salt content in the amine liquid remains unchanged, the intelligent diversion calculation module calculates the theoretical amine liquid flow rate of the diversion channel as 40.0 t / h after data analysis, and the system automatically starts a new round of adjustment process.

[0077] Throughout the adjustment process, the system continuously records changes in various process parameters and has an anomaly handling mechanism. For example, if the existing heat-stabilized salt treatment unit is operating at full load but still cannot meet the heat-stabilized salt control values, or if the removal efficiency of the heat-stabilized salt removal unit is below 40%, an alarm mechanism is triggered, sending an alert to notify manual intervention. This intelligent diversion and purification control method effectively responds to changes in operating conditions, adjusts the diversion flow rate for heat-stabilized salt removal and purification in the amine solution in real time, and ensures the safe, stable, and economical operation of the system.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent diversion and purification control system for thermally stable salts in an amine liquid system, characterized in that: It includes an amine liquid purification module, a data acquisition module, an intelligent diversion calculation module, and an intelligent diversion control module. The amine liquid purification module is used to purify the amine liquid and remove the heat-stable salts from the amine liquid until the heat-stable salts in the amine liquid reach the preset target control value. The amine liquid purification module is equipped with a diversion mechanism, which divides the amine liquid flow into a main path and a branch path. The data acquisition module is used to collect the process parameters of the amine liquid purification module and send the process parameters to the intelligent diversion calculation module; The intelligent flow splitting calculation module is used to calculate the theoretical amine flow rate of the splitting based on process parameters and the target control value of the thermally stable salt, and then send the theoretical amine flow rate of the splitting to the intelligent flow splitting control module. The intelligent diversion control module is used to control the diversion mechanism to divert the amine liquid according to the theoretical amine liquid flow rate of the diversion channel.

2. The intelligent diversion and purification control system for thermally stable salts in an amine liquid system as described in claim 1, characterized in that: The amine purification module includes an input unit, a main channel, a branch channel, and a fusion unit. The main channel and the branch channel are connected in parallel. A heat-stable salt removal device is provided on the branch channel. The fusion unit is used to fuse the amine solutions output from the main channel and the branch channel and output them.

3. The intelligent diversion and purification control system for thermally stable salts in an amine liquid system as described in claim 1, characterized in that: The process parameters include the total flow rate of the amine solution, the content of thermally stable salts in the input amine solution, the content of thermally stable salts in the branch output amine solution, and the content of thermally stable salts in the final output amine solution.

4. The intelligent diversion and purification control system for thermally stable salts in an amine liquid system as described in claim 1, characterized in that: The data acquisition module and the amine purification module exchange data via MODBUS or OPC UA communication protocol to obtain the process parameters of the amine purification module.

5. The intelligent diversion and purification control system for thermally stable salts in an amine liquid system as described in claim 3, characterized in that: The execution process of the intelligent diversion and purification control system includes the following steps: S1. Obtain the process parameters of the amine purification module through multiple sensors. S2. Based on the preset target control value for thermally stable salt, the theoretical amine flow rate of the branch is calculated according to the process parameters. S3. Determine the amine flow rates of the main path and branch paths based on the theoretical amine flow rates of the branch paths, and control the diversion mechanism to divert the amine flow according to the amine flow rates of the main path and branch paths.

6. The intelligent diversion and purification control system for thermally stable salts in an amine liquid system as described in claim 5, characterized in that: Step S2 specifically includes: calculating the heat-stable salt removal efficiency of the branch based on the heat-stable salt content in the input amine solution and the heat-stable salt content in the branch output amine solution; and calculating the theoretical amine solution flow rate of the branch based on the heat-stable salt removal efficiency and the target control value of the heat-stable salt.

7. The intelligent diversion and purification control system for thermally stable salts in an amine liquid system as described in claim 6, characterized in that: The formula for calculating the heat-stable salt removal efficiency of the branch circuit is as follows: η is the heat-stable salt removal efficiency of the branch, %; C1 is the heat-stable salt content in the input amine solution, wt%; C2 is the heat-stable salt content in the output amine solution, wt%.

8. The intelligent diversion and purification control system for thermally stable salts in an amine liquid system as described in claim 7, characterized in that: The formula for calculating the theoretical amine flow rate of the branch circuit is as follows: Q2 is the theoretical amine flow rate of the branch, t / h; Q0 is the total amine flow rate, t / h; C1 is the content of thermally stable salts in the input amine solution, wt%; C0 is the target control value of thermally stable salts, wt%; η is the thermally stable salt removal efficiency of the branch, %.

9. The intelligent diversion and purification control system for thermally stable salts in an amine liquid system as described in claim 1, characterized in that: When the amine solution is ethanolamine or diethanolamine, the target control value for heat-stable salts is ≤4%; when the amine solution is N-methyldiethanolamine, the target control value for heat-stable salts is ≤2%.

10. The intelligent diversion and purification control system for thermally stable salts in an amine liquid system as described in claim 5, characterized in that: Step S3 further includes: performing a conditional judgment on the content of heat-stable salts in the final output amine liquid, and determining whether to shut down the intelligent diversion and purification control system based on the conditional judgment result. The conditional judgment process is as follows: when the data acquisition module collects that the content of heat-stable salts in the final output amine liquid meets C3≤C0, then the amine liquid purification is stopped; otherwise, the amine liquid purification continues. Wherein, C3 is the content of heat-stable salts in the final output amine liquid, and C0 is the target control value of heat-stable salts.

Images