Automatic control method and system for methanol aqueous solution

Abstract

The invention discloses an automatic control method and system for a methanol aqueous solution, and belongs to the field of automatic control systems. The system comprises a raw material unit, a mixing unit, a storage unit, a liquid supplementing unit, a detection unit and a control unit. The raw material unit is used for storing pure methanol and deionized water and monitoring the liquid level change in real time through a liquid level sensor; the mixing unit is used for accurately mixing methanol and water according to a set proportion through cooperative work of an infusion pump and a stirrer; the storage unit is used for storing the prepared methanol aqueous solution and conveying the methanol aqueous solution to the reaction device through an infusion pump; the liquid supplementing unit adjusts the liquid supplementing amount through a liquid supplementing pump, an electromagnetic valve and an overflow valve to ensure that the methanol aqueous solution is supplemented in time according to equipment requirements; the detection unit monitors the state of the methanol aqueous solution in real time through concentration, liquid level, temperature and pressure sensors; the control unit receives signals of all the sensors, carries out data processing and adjusts the working state of all the units of the system, and it is ensured that the proportion, the liquid level, the flow, the temperature and the pressure of the methanol aqueous solution are always in the ideal state. Through automatic control and real-time feedback adjustment, errors caused by manual operation are eliminated, and the efficiency of the methanol-to-hydrogen equipment and the quality of hydrogen are improved.

Description

Technical Field

[0001] This application relates to the field of automated control systems, and in particular to an automatic control method and system for methanol-water solutions. Background Technology

[0002] In methanol-to-hydrogen equipment, the ratio of methanol-water solution and timely replenishment have a significant impact on the equipment's operating efficiency, hydrogen production, and hydrogen quality. Traditional methods for preparing and replenishing methanol-water solution typically rely on manual operation or simple level control systems. This approach is not only cumbersome but also prone to inaccurate ratios and untimely replenishment due to human error or malfunctioning level sensors, thus affecting the stability of the methanol-to-hydrogen process.

[0003] In existing technologies, many methods for preparing and replenishing methanol-water solutions rely on fixed mixing ratios and timed liquid level monitoring. However, these methods have several drawbacks: Due to the lack of real-time monitoring and feedback adjustment, traditional systems cannot accurately control the methanol-to-water ratio according to the actual needs of the reaction equipment, leading to mixing errors and affecting hydrogen production and quality. Existing liquid level control systems generally only monitor the upper and lower limits of the liquid level, triggering replenishment only when the level is too low. This replenishment reaction is often delayed and fails to automatically replenish based on real-time changes in solution concentration. Inhomogeneous mixing of methanol and water can affect the reaction process, resulting in unstable hydrogen production. The simple mixing methods in existing technologies cannot guarantee the homogeneity of the methanol-water solution, affecting the efficiency of methanol-to-hydrogen equipment.

[0004] Therefore, there is an urgent need for a new technical solution that can provide more accurate methanol-water solution ratios, automatic replenishment, and real-time detection functions to ensure the quality stability of methanol-water solutions, thereby improving the stability of the methanol-to-hydrogen process and the yield and quality of hydrogen. Summary of the Invention

[0005] This application provides an automatic control method and system for methanol-water solutions. The technical solution is as follows: According to one aspect of this application, an automatic control system for methanol-water solution is provided, the system comprising: The raw material unit is used to store pure methanol and deionized water and is equipped with a liquid level sensor to monitor liquid level changes; The mixing unit includes a mixing tank, a stirrer, and a pump. The mixing tank is used to mix methanol and deionized water in a set ratio, the stirrer is used to accelerate the mixing, and the pump is used to control the inflow of methanol and water. The storage unit, including a methanol tank and a pump, is used to store the prepared methanol-water solution and transport it to the reaction apparatus. The replenishment unit includes a replenishment pump, a replenishment pipeline, a solenoid valve, and an overflow valve. The replenishment pump is used to deliver the prepared methanol-water solution to the methanol-to-hydrogen equipment, and the solenoid valve is used to precisely adjust the replenishment volume. The filter unit is installed at the front end of each liquid pump and replenishment pump to remove impurities from the fluid entering each stage. The detection unit includes a concentration sensor, a liquid level sensor, a temperature sensor, and a pressure sensor, which are used to monitor the concentration, liquid level, temperature, and pressure of the methanol aqueous solution in real time. The control unit receives signals from various sensors and controls the adjustment of liquid level, flow rate, concentration, and temperature to ensure accurate and stable mixing ratio of methanol-water solution.

[0006] Optionally, the system uses an embedded controller or a programmable logic controller (PLC) to achieve real-time monitoring and feedback adjustment of each unit; The replenishment unit adjusts the replenishment volume of each branch through solenoid valves to ensure that the methanol aqueous solution can be replenished in a timely manner according to the needs of the methanol to hydrogen equipment. The mixing unit works in conjunction with a liquid pump and a stirrer to ensure that methanol and water are mixed efficiently in a preset ratio, and the concentration of the mixed solution is monitored in real time by a concentration sensor.

[0007] Optionally, the system also includes an intelligent early warning function. When the liquid level, concentration, temperature, or pressure is detected to exceed the set range, the control unit automatically issues an alarm and stops the relevant operation.

[0008] Optionally, the replenishment pipeline is equipped with a pressure sensor and a flow sensor to monitor the pressure and flow rate during the replenishment process, and to control the operation of the replenishment pump based on the sensor data.

[0009] On the other hand, an automatic replenishment and detection control method for methanol-water solution is provided, applicable to the aforementioned automatic replenishment and detection control system for methanol-water solution, the method comprising: Step 1: Preset the target concentration of methanol-water solution using the control unit. , Liquid level threshold of mixing tank Temperature compensation model Where ρ0 is the reference temperature The density of the methanol-water solution at the given temperature, where k is the temperature-density correction factor; Step two: Using the level sensors in the raw material unit and storage unit, monitor the real-time levels L of the pure methanol tank, deionized water tank, and methanol-water tank; if the methanol-water tank level... The control unit initiates the automatic mixing process of the mixing unit; if Based on the real-time load signal of the methanol-to-hydrogen equipment, the amount of liquid replenishment in each branch is adjusted through the solenoid valve of the liquid replenishment unit to perform precise liquid replenishment on demand. Step three, in the preparation process, the control unit verifies the liquid levels in the pure methanol tank and deionized water tank; if the liquid levels are normal, proceed according to... Calculate the theoretical volumetric flow rate ratio of methanol to deionized water. The real-time temperature T collected by the temperature sensor in the detection unit of the mixing tank is used to correct the actual mass flow rate ratio using ρ(T). The power of the mixing unit's pump is dynamically adjusted to ensure that methanol and deionized water are mixed in a controlled manner. The mixture flows into the mixing tank, and the agitator is started simultaneously. Step four: The concentration C of the methanol-water solution is monitored in real time using concentration sensors in the mixing and storage units. If... ,in To account for the allowable concentration deviation, the control unit further adjusts the flow ratio based on ρ(T) until C stabilizes. If the temperature sensor in the detection unit detects... ( (If the temperature alarm threshold is reached), the stirrer speed will be immediately reduced and deionized water will be temporarily replenished. Step 5: If the liquid level in the pure methanol tank or deionized water tank is higher than the level after starting the preparation process... It did not recover to the level within a certain period of time. The control unit triggers the intelligent early warning function, issues an audible and visual alarm, and interlocks to suspend the operation of the methanol-to-hydrogen equipment until the liquid level is restored. If the pressure sensor and flow sensor of the replenishment pipeline detect abnormalities, an early warning is triggered simultaneously and the operation of the replenishment pump is adjusted.

[0010] Optionally, the method for constructing the temperature compensation model ρ(T) includes: In a laboratory setting, the temperature of the methanol-water solution was controlled using a constant-temperature water bath device. gradient change to The density ρ at each temperature point is collected by a high-precision density meter in the detection unit, and the density is obtained by least squares fitting. Where a, b, and c are the fitting coefficients, and the goodness of fit is... ≥0.995, and the model is then stored in the storage module of the control unit.

[0011] Optionally, step four further includes: When concentration deviation At that time, if The control unit is according to the formula To reduce the power of the methanol pump in the mixing unit, This is the concentration-power adjustment coefficient, with a value ranging from 0.1 to 0.5; if Then, increase the power of the methanol pump according to the same formula; when the temperature At that time, the control unit first changed the speed of the mixer in the mixing unit from Down to Simultaneously, a temporary cooling mode is activated for the deionized water branch of the raw material unit until the temperature sensor in the detection unit detects... ,in, This is the temperature-speed adjustment coefficient, ranging from 0.01 to 0.05. The temporary cooling mode is used to supplement an additional 5%-10% of deionized water.

[0012] Optionally, step five further includes: If the temperature sensor in the detection unit of the mixing tank detects a temperature T of... If the internal temperature continues to rise at a rate ΔT / Δt > 0.5℃ / s, the control unit determines it as an "abnormal temperature rise fault," immediately cuts off the power to all pumps in the mixing unit, starts the emergency vent valve of the mixing tank, and pushes fault code E001 to the remote monitoring terminal through the control unit. After the fault is cleared, wait for the control unit to be manually reset before restarting the process.

[0013] Optionally, step one can be linked with the operating mode of the methanol-to-hydrogen equipment, including: When the methanol-to-hydrogen equipment switches to "start-up mode", the liquid level threshold... Adjust to start-up liquid level , The parameters are 10%-15% higher than the normal threshold. After the equipment enters the "stable operation mode", it automatically returns to the preset normal parameters and achieves adaptive control of the operating conditions through the control unit.

[0014] This invention provides an automatic methanol-water solution preparation, detection, and control system for precisely controlling the methanol-water ratio and achieving automatic replenishment, thereby improving the operating efficiency and stability of methanol-to-hydrogen equipment. The system includes a raw material unit, a mixing unit, a storage unit, a replenishment unit, a detection unit, and a control unit. The raw material unit stores pure methanol and deionized water, and monitors liquid level changes in real time using a level sensor. The mixing unit, through the coordinated operation of a pump and a stirrer, precisely mixes methanol and water according to a set ratio. The storage unit stores the prepared methanol-water solution and delivers it to the reaction device via a pump. The replenishment unit regulates the replenishment volume using a replenishment pump, a solenoid valve, and an overflow valve to ensure timely replenishment of the methanol-water solution as needed by the equipment. The detection unit monitors the state of the methanol-water solution in real time using concentration, level, temperature, and pressure sensors. The control unit receives signals from each sensor, processes the data, and adjusts the operating status of each unit in the system to ensure that the methanol-water solution ratio, level, flow rate, temperature, and pressure are always at an ideal state. This invention, through automated control and real-time feedback adjustment, eliminates errors caused by manual operation, improves the efficiency of methanol-to-hydrogen equipment and the quality of hydrogen, and has broad application prospects. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This embodiment illustrates an automatic control system for methanol-water solutions. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0018] In this article, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0019] Example 1 like Figure 1 As shown, this embodiment provides an automatic control system for methanol-water solutions. The following is a description and its working principle. The system includes: The raw material unit is used to store pure methanol and deionized water, and is equipped with a level sensor to monitor changes in liquid level. Specifically, the raw material unit includes a pure methanol tank and a deionized water tank, used to store methanol and deionized water respectively. Level sensors are installed on the tanks to monitor the liquid level in real time.

[0020] The mixing unit includes a mixing tank, a stirrer, and a pump. The mixing tank is used to mix methanol and deionized water in a set ratio. The stirrer accelerates the mixing process, and the pump controls the flow rate of methanol and water. Specifically, it consists of a mixing tank, a stirrer, and a pump. The mixing tank is used to mix methanol and water in a certain proportion to form a methanol-water solution. The stirrer is installed inside the mixing tank to accelerate the mixing process and ensure the solution is uniformly mixed. The pumps are installed on the pipelines connecting the pure methanol tank, the deionized water tank, and the mixing tank, respectively, to control the flow rate of methanol and deionized water.

[0021] The storage unit, including a methanol-water tank and a pump, is used to store the prepared methanol-water solution and transport it to the reaction apparatus. Specifically, the methanol-water tank stores the prepared methanol-water solution, and the pump, installed between the methanol-water tank and the mixing tank, is responsible for pumping the prepared methanol-water solution into the methanol-water tank.

[0022] The replenishment unit includes a replenishment pump, replenishment piping, solenoid valves, and an overflow valve. The replenishment pump delivers the prepared methanol-water solution to the methanol-to-hydrogen equipment, and the solenoid valves precisely regulate the replenishment volume. Specifically, it includes a replenishment pump, replenishment piping, solenoid valves, and an overflow valve. The replenishment pump delivers the mixed methanol-water solution to the inlet of the methanol-to-hydrogen equipment; pressure and flow sensors are installed on the replenishment piping to monitor the pressure and flow rate of the replenishment; solenoid valves are installed at each branch of the replenishment piping to control the replenishment volume of each branch, and the arrangement of multiple solenoid valves allows for the addition or removal of reaction devices; the overflow valve returns excess fluid to the methanol-water tank when the pressure in the replenishment piping exceeds a certain value.

[0023] Specifically, the replenishment pump delivers the mixed methanol-water solution to the inlet of the methanol-to-hydrogen equipment; pressure and flow sensors are installed on the replenishment pipeline to monitor the pressure and flow rate of the replenishment; solenoid valves are installed at each branch of the replenishment pipeline to control the replenishment volume of each branch, and the arrangement of multiple solenoid valves allows the system to add or remove reaction devices at will; the overflow valve returns the excess fluid to the methanol-water tank when the pressure in the replenishment pipeline exceeds a certain value.

[0024] The filtration unit, installed at the front end of each pump and replenishment pump, is used to remove impurities from the fluids entering each stage, improve the purity of the reaction raw materials, and ensure more accurate and efficient reactions.

[0025] The detection unit includes a concentration sensor, a level sensor, a temperature sensor, and a pressure sensor. The sensors are used to monitor the concentration, level, temperature, and pressure of the methanol aqueous solution in real time.

[0026] Specifically, a concentration sensor is installed inside the mixing tank to detect the concentration of the methanol-water solution in real time; a level sensor is arranged in each tank as well as on the test bench and methanol-to-hydrogen machine at the application end to monitor changes in the level in real time; and a temperature sensor and a pressure sensor are installed in the replenishment pipeline as well as on the test bench and methanol-to-hydrogen machine at the application end to monitor changes in the temperature and pressure of the methanol-water solution.

[0027] The control unit receives signals from various sensors and controls the adjustment of liquid level, flow rate, concentration, and temperature to ensure accurate and stable mixing ratio of methanol-water solution.

[0028] This system comprises multiple units. The raw material unit stores pure methanol and deionized water, and monitors the liquid level using a level sensor. The mixing unit includes a mixing tank, a stirrer, and a pump. The mixing tank mixes methanol and water according to a preset ratio, and the stirrer accelerates the mixing process to ensure a homogeneous solution. The storage unit stores and delivers the prepared methanol-water solution via a pump. The replenishment unit regulates the replenishment volume using a replenishment pump and a solenoid valve to meet the requirements of the methanol-to-hydrogen equipment. The detection unit monitors the state of the methanol-water solution using concentration, level, temperature, and pressure sensors. The control unit receives sensor signals and adjusts relevant equipment to ensure accurate methanol-water solution proportions.

[0029] By employing multiple sensors, the system monitors the concentration, level, temperature, and pressure of the methanol-water solution in real time, enabling precise adjustment of flow rate and mixing ratio. This system effectively solves the problems of inaccurate proportioning and delayed replenishment in traditional methods, ensuring that the methanol-to-hydrogen equipment remains in optimal working condition under various operating conditions, thus improving equipment stability and hydrogen production.

[0030] Example 2 Optionally, the control unit adopts an embedded controller to receive signals from the level sensor, pressure sensor, flow sensor, concentration sensor and temperature sensor, and control the operation of the flow regulating valve, stirrer and replenishment pump according to preset parameters (not limited to embedded, but also programmable logic controller (PLC) can be used). That is, for the system, the embedded controller or programmable logic controller (PLC) realizes the real-time monitoring and feedback adjustment of each unit.

[0031] The replenishment unit adjusts the replenishment volume of each branch through solenoid valves to ensure that the methanol-water solution can be replenished in a timely manner according to the needs of the methanol-to-hydrogen equipment.

[0032] The mixing unit works in conjunction with a pump and a stirrer to ensure that methanol and water are mixed efficiently in a preset ratio, and the concentration of the mixed solution is monitored in real time by a concentration sensor.

[0033] This embodiment employs an embedded controller or PLC for real-time monitoring and feedback adjustment of each unit in the system. The embedded controller controls the operating status of each component based on data provided by sensors. The replenishment unit adjusts the replenishment volume of each branch via solenoid valves to ensure precise replenishment of the methanol-water solution according to the requirements of the methanol-to-hydrogen equipment. The mixing unit, through the combined operation of a pump and a stirrer, adjusts the flow ratio of methanol to water in real time and monitors the concentration of the mixed solution using a concentration sensor.

[0034] Using embedded controllers or PLCs enables precise control of the system, enhancing its response speed and real-time performance. Adjustments to the solenoid valves and pumps ensure that the methanol-water solution ratio remains ideal, preventing errors due to changes in reaction conditions, thereby improving the stability and hydrogen production of the methanol-to-hydrogen process.

[0035] Example 3 Optionally, the system also includes an intelligent early warning function. When the liquid level, concentration, temperature, or pressure is detected to exceed the set range, the control unit will automatically issue an alarm and stop the relevant operation.

[0036] In this system, when the level sensor, concentration sensor, temperature sensor, or pressure sensor detects conditions exceeding the set range, the control unit issues an alarm signal via its built-in intelligent early warning function. The control unit will automatically stop the relevant operations to prevent equipment damage. For example, when the methanol tank level falls below the set lower limit, the system will issue an alarm and stop the replenishment operation to avoid equipment failure caused by idling or insufficient liquid.

[0037] The intelligent early warning function can monitor key parameters in real time during equipment operation, preventing the equipment from operating under abnormal conditions and reducing equipment damage and malfunctions caused by abnormal situations. This function not only improves system safety but also ensures that the methanol-to-hydrogen equipment operates under stable conditions, thereby improving system reliability and long-term operating efficiency.

[0038] Example 4 Optionally, the replenishment pipeline is equipped with pressure and flow sensors to monitor the pressure and flow during the replenishment process and control the operation of the replenishment pump based on the sensor data.

[0039] In this embodiment, pressure and flow sensors are installed on the replenishment pipeline to monitor pressure and flow data in real time during the replenishment process. When the sensors detect that the pressure or flow rate exceeds the set range during the replenishment process, the system automatically adjusts the operating rate of the replenishment pump to ensure precise control of the replenishment volume. The sensor data is input to the control unit, which adjusts the pump and solenoid valve based on the data feedback to ensure accurate replenishment.

[0040] Through real-time monitoring by pressure and flow sensors, the system can precisely control the replenishment volume, preventing deviations in solution concentration caused by excessive or insufficient flow. This function ensures that the methanol-water solution ratio remains within a predetermined range, improving the efficiency and stability of the methanol-to-hydrogen process and preventing malfunctions in the reaction equipment due to unstable liquid supply.

[0041] Example 5 On the other hand, an automatic methanol-water solution replenishment and detection control method is provided, applicable to the aforementioned automatic methanol-water solution replenishment and detection control system. The method includes: Step 1 (Multi-parameter preset): Preset the target concentration of methanol-water solution through the control unit. , Liquid level threshold of mixing tank Temperature compensation model Where ρ0 is the reference temperature The density of the methanol-water solution is given by k, which is the temperature-density correction factor. This means that, based on the reaction requirements of the methanol-to-hydrogen equipment, parameters such as the target concentration of the methanol-water solution, the liquid level range of the mixing tank, and the pressure and flow rate of the replenishment liquid are preset in the control unit.

[0042] Step 2 (Level-linked trigger): Using the level sensors in the raw material unit and storage unit, monitor the real-time levels L of the pure methanol tank, deionized water tank, and methanol-water tank; if the methanol-water tank level... The control unit initiates the automatic mixing process of the mixing unit; if Based on the real-time load signal of the methanol-to-hydrogen equipment, the amount of liquid replenishment in each branch is adjusted through the solenoid valve of the liquid replenishment unit to perform precise liquid replenishment on demand.

[0043] Step 3 (Temperature-Compensated Solution Preparation): During the preparation process, the control unit verifies the liquid levels in the pure methanol tank and the deionized water tank. If the liquid levels are normal, the theoretical volumetric flow rate ratio of methanol to deionized water is calculated based on Ct. The real-time temperature T collected by the temperature sensor in the detection unit of the mixing tank is used to correct the actual mass flow rate ratio using ρ(T). The power of the mixing unit's pump is dynamically adjusted to ensure that methanol and deionized water are mixed in a controlled manner. The mixture flows into the mixing tank, and the agitator is started simultaneously.

[0044] Step 4 (Dynamic Closed-Loop Control): The concentration C of the methanol-water solution is monitored in real time using concentration sensors in the mixing and storage units. If... ,in To account for the allowable concentration deviation, the control unit further adjusts the flow ratio based on ρ(T) until C stabilizes. If the temperature sensor in the detection unit detects... ( (If the temperature alarm threshold is reached), the stirrer will immediately slow down and deionized water will be temporarily replenished.

[0045] Step 5 (Abnormal Interlock Protection): If the liquid level in the pure methanol tank or deionized water tank exceeds the level after the preparation process is started... It did not recover to the level within a certain period of time. The control unit triggers the intelligent early warning function, issues an audible and visual alarm, and interlocks to suspend the operation of the methanol-to-hydrogen equipment until the liquid level is restored. If the pressure sensor and flow sensor of the replenishment pipeline detect abnormalities, an early warning is triggered simultaneously and the operation of the replenishment pump is adjusted.

[0046] Optionally, methods for constructing the temperature compensation model ρ(T) include: In a laboratory environment, controlling the temperature of the methanol-water solution from [temperature value missing] using a constant-temperature water bath. gradient change to The density ρ at each temperature point is collected by a high-precision density meter in the detection unit, and the density is obtained by least squares fitting. Where a, b, and c are the fitting coefficients, and the goodness of fit is... The model is then stored in the storage module of the control unit.

[0047] Optionally, step four also includes: when concentration deviation At that time, if The control unit is according to the formula To reduce the power of the methanol pump in the mixing unit, This is the concentration-power adjustment coefficient, with a value ranging from 0.1 to 0.5; if Then, increase the power of the methanol pump according to the same formula; when the temperature At that time, the control unit first changed the speed of the mixer in the mixing unit from Down to Simultaneously, a temporary cooling mode is activated for the deionized water branch of the raw material unit until the temperature sensor in the detection unit detects... ,in, This is the temperature-speed adjustment coefficient, ranging from 0.01 to 0.05. The temporary cooling mode is used to supplement an additional 5%-10% of deionized water.

[0048] Optionally, step five also includes: If the temperature sensor in the detection unit of the mixing tank detects a temperature T at... If the internal temperature continues to rise at a rate ΔT / Δt > 0.5℃ / s, the control unit determines it as an "abnormal temperature rise fault," immediately cuts off the power to all pumps in the mixing unit, starts the emergency vent valve of the mixing tank, and pushes fault code E001 to the remote monitoring terminal through the control unit. After the fault is cleared, wait for the control unit to be manually reset before restarting the process.

[0049] Optionally, step one can be linked to the operating mode of the methanol-to-hydrogen equipment, including: when the methanol-to-hydrogen equipment switches to "start-up mode", the liquid level threshold. Adjust to start-up liquid level , The parameters are 10%-15% higher than the normal threshold. After the equipment enters the "stable operation mode", it automatically returns to the preset normal parameters and achieves adaptive control of the operating conditions through the control unit.

[0050] Therefore, it can be seen that, Figure 1 As shown, the raw material unit consists of a pure methanol tank, a deionized water tank, and a level sensor, responsible for storing raw materials and monitoring the liquid level; the mixing unit includes a mixing and preparation tank, a stirrer, and a pump to achieve proportional mixing of methanol and water; the storage unit corresponds to the methanol-water tank and delivers the solution via a pump; the replenishment unit consists of a replenishment pump, solenoid valves, etc., to precisely control the replenishment of liquid to the test bench and the methanol-to-hydrogen machine; the filtration unit removes impurities using filters at the front end of each pump; the detection unit collects parameters through temperature and pressure sensors, as well as level and concentration sensors; the control unit receives signals and regulates each component to ensure that the system, according to the control method claimed in the claims, achieves automatic and precise preparation, replenishment, and closed-loop parameter adjustment of the methanol-water solution.

[0051] Figure 1 As shown, temperature and pressure sensors collect real-time parameters of the methanol-water solution, and level sensors monitor the liquid levels of the raw material tank (pure methanol tank, deionized water tank) and storage tank (methanol-water tank). These data are input to the control unit (the core control module in the figure) through pipelines (implicit signal transmission path).

[0052] The control unit outputs commands to the execution components based on "dynamic control logic" (such as temperature compensation and concentration feedback): If the temperature sensor detects that the temperature of the mixing tank is too high (triggering the "temperature compensation" condition in the claim), the control unit adjusts the power of the liquid pump (reducing the methanol / deionized water inflow rate or increasing the deionized water replenishment) and the speed of the stirrer (implied in the figure, linked by the control unit); if the liquid level sensor detects that the liquid level in the methanol-water tank is too low (triggering the "automatic preparation / replenishment" condition), the control unit starts the replenishment pump or adjusts the opening of the solenoid valve to replenish the methanol-water solution. The pumps (pure methanol tank, deionized water tank, and mixing tank), replenishment pumps, and solenoid valves are the "execution terminals" for dynamic control. Through linkage with the control unit, the "flow ratio correction and precise replenishment volume control" in the claims are realized: When the ratio of methanol to water needs to be dynamically adjusted during the mixing process (as described in the claim "temperature compensation to correct the flow ratio"), the control unit adjusts the power of the pumps for the pure methanol tank / deionized water tank to change the rate at which the fluid flows into the mixing tank, thus achieving dynamic correction of the "theoretical flow ratio → actual mass flow ratio"; When the replenishment stage needs to allocate flow according to the requirements of the test bench and methanol-to-hydrogen machine (as described in the claim "precise replenishment on demand"), the control unit adjusts the opening of the solenoid valves of each branch to allocate methanol-water solution to different application terminals in real time, matching the control logic of "multi-branch dynamic replenishment".

[0053] Figure 1 As shown, temperature and pressure sensors are deployed in the main pipeline of the system, and level sensors cover the entire process of raw materials, storage, and mixing, forming a "multi-dimensional parameter monitoring network." This corresponds to the premise of "real-time detection and feedback adjustment": temperature sensors monitor the fluid temperature in the mixing tank and main pipeline to provide real-time data for the "temperature compensation model"; pressure sensors monitor the pressure in the replenishment pipeline and, in conjunction with flow logic, realize "dynamic adjustment of replenishment pump speed"; and level sensors provide real-time feedback on the storage status of raw materials / finished products, triggering dynamic responses of "automatic preparation / replenishment / alarm."

[0054] This application also provides a computer-readable medium storing at least one instruction, which is loaded and executed by the processor to implement the intelligent control method for the methanol-to-hydrogen system as described in the above embodiments.

[0055] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An automatic control system for methanol-water solution, characterized in that, The system includes: The raw material unit is used to store pure methanol and deionized water and is equipped with a liquid level sensor to monitor liquid level changes; The mixing unit includes a mixing tank, a stirrer, and a pump. The mixing tank is used to mix methanol and deionized water in a set ratio, the stirrer is used to accelerate the mixing, and the pump is used to control the inflow of methanol and water. The storage unit, including a methanol tank and a pump, is used to store the prepared methanol-water solution and transport it to the reaction apparatus. The replenishment unit includes a replenishment pump, a replenishment pipeline, a solenoid valve, and an overflow valve. The replenishment pump is used to deliver the prepared methanol-water solution to the methanol-to-hydrogen equipment, and the solenoid valve is used to precisely adjust the replenishment volume. The filter unit is installed at the front end of each liquid pump and replenishment pump to remove impurities from the fluid entering each stage. The detection unit includes a concentration sensor, a liquid level sensor, a temperature sensor, and a pressure sensor, which are used to monitor the concentration, liquid level, temperature, and pressure of the methanol aqueous solution in real time. The control unit receives signals from various sensors and controls the adjustment of liquid level, flow rate, concentration, and temperature to ensure accurate and stable mixing ratio of methanol-water solution.

2. The automatic methanol-water solution replenishment, preparation, detection, and control system according to claim 1, characterized in that, The system uses an embedded controller or a programmable logic controller (PLC) to achieve real-time monitoring and feedback adjustment of each unit; The replenishment unit adjusts the replenishment volume of each branch through solenoid valves to ensure that the methanol aqueous solution can be replenished in a timely manner according to the needs of the methanol to hydrogen equipment. The mixing unit works in conjunction with a liquid pump and a stirrer to ensure that methanol and water are mixed efficiently in a preset ratio, and the concentration of the mixed solution is monitored in real time by a concentration sensor.

3. The automatic methanol-water solution replenishment, preparation, detection, and control system according to claim 1, characterized in that, The system also includes an intelligent early warning function. When the liquid level, concentration, temperature or pressure is detected to be outside the set range, the control unit will automatically issue an alarm and stop the relevant operation.

4. The automatic methanol-water solution replenishment, preparation, detection, and control system according to claim 1, characterized in that, The replenishment pipeline is equipped with pressure and flow sensors to monitor the pressure and flow rate during the replenishment process and control the operation of the replenishment pump based on the sensor data.

5. An automatic methanol-water solution preparation, detection, and control method, characterized in that, The method applicable to the automatic methanol-water solution replenishment and detection control system according to any one of claims 1 to 4, comprises: Step 1: Preset the target concentration of methanol-water solution using the control unit. , Liquid level threshold of mixing tank Temperature compensation model ,in, Reference temperature The density of the methanol-water solution at the given temperature, where k is the temperature-density correction factor; Step 2: Using the level sensors in the raw material unit and storage unit, monitor the real-time levels L of the pure methanol tank, deionized water tank, and methanol-water tank; if the methanol-water tank level L < The control unit initiates the automatic mixing process of the mixing unit; if L ≥ Based on the real-time load signal of the methanol-to-hydrogen equipment, the amount of liquid replenishment in each branch is adjusted through the solenoid valve of the liquid replenishment unit to perform precise liquid replenishment on demand. Step 3: During the preparation process, the control unit verifies the liquid levels in the pure methanol tank and the deionized water tank. If the liquid levels are normal, the theoretical volumetric flow rate ratio of methanol to deionized water is calculated based on Ct. The real-time temperature T collected by the temperature sensor in the detection unit of the mixing tank is used to correct the actual mass flow rate ratio using ρ(T). The power of the mixing unit's pump is dynamically adjusted to ensure that methanol and deionized water are mixed in a controlled manner. The mixture flows into the mixing tank, and the agitator is started simultaneously. Step four: The concentration C of the methanol-water solution is monitored in real time using concentration sensors in the mixing and storage units. If... ,in To account for the allowable concentration deviation, the control unit further adjusts the flow ratio based on ρ(T) until C stabilizes. If the temperature sensor in the detection unit detects... ( (If the temperature alarm threshold is reached), the stirrer speed will be immediately reduced and deionized water will be temporarily replenished. Step 5: If the liquid level in the pure methanol tank or deionized water tank is higher than the level after starting the preparation process... It did not recover to the level within a certain period of time. The control unit triggers the intelligent early warning function, issues an audible and visual alarm, and interlocks to suspend the operation of the methanol-to-hydrogen equipment until the liquid level is restored. If the pressure sensor and flow sensor of the replenishment pipeline detect abnormalities, an early warning is triggered simultaneously and the operation of the replenishment pump is adjusted.

6. The automatic replenishment, preparation, detection, and control method for methanol-water solution according to claim 5, characterized in that, The method for constructing the temperature compensation model ρ(T) includes: In a laboratory environment, controlling the temperature of the methanol aqueous solution from [temperature value missing] using a constant temperature water bath device. gradient change to The density ρ at each temperature point is collected by a high-precision density meter in the detection unit, and the density is obtained by least squares fitting. Where a, b, and c are the fitting coefficients, and the goodness of fit is... The model is then stored in the storage module of the control unit.

7. The automatic replenishment, preparation, detection, and control method for methanol-water solution according to claim 5, characterized in that, Step 4 further includes: When the concentration deviation is less than , the control unit reduces the power of the methanol extraction pump of the mixing unit according to the formula , where is the concentration-power adjustment coefficient, with a value range of 0.1 - 0.5; if C < Ct, the power of the methanol extraction pump is increased according to the same formula; when the temperature is higher than , the control unit first reduces the rotation speed of the stirrer in the mixing unit from , and at the same time activates the temporary cooling mode of the deionized water branch of the raw material unit until the temperature sensor in the detection unit monitors , where is the temperature-rotation speed adjustment coefficient, with a value range of 0.01 - 0.05, and the temporary cooling mode is used to additionally supplement 5% - 10% of deionized water.

8. The automatic methanol aqueous solution replenishment, preparation, detection, and control method according to claim 5, characterized in that, Step five further includes: If the temperature sensor in the detection unit of the mixing tank detects a temperature T of... If the internal temperature continues to rise at a rate ΔT / Δt > 0.5℃ / s, the control unit determines it as an "abnormal temperature rise fault," immediately cuts off the power to all pumps in the mixing unit, starts the emergency vent valve of the mixing tank, and pushes fault code E001 to the remote monitoring terminal through the control unit. After the fault is cleared, wait for the control unit to be manually reset before restarting the process.

9. The control method according to claim 5, characterized in that, Step one supports linkage with the operating mode of the methanol-to-hydrogen equipment, including: when the methanol-to-hydrogen equipment switches to "start-up mode", the liquid level threshold. Adjust to start-up liquid level , The parameters are 10%-15% higher than the normal threshold. After the equipment enters the "stable operation mode", it automatically returns to the preset normal parameters and realizes adaptive control of the operating conditions through the control unit.

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