A monitoring and early warning system and method for special gas mixed transportation

Abstract

The present invention relates to a special gas mixing and delivery technology used in a photovoltaic plant, and is a monitoring and early warning system and method for the mixing and delivery of special gases. The present invention proposes the following scheme, sets the initial flow, pressure, temperature and mixing ratio parameters of the gas to be mixed, and monitors the gas flow in real time through a flow monitoring device. If the flow does not meet the preset error threshold, the flow opening is adjusted based on a PID control algorithm. When the gas enters the mixing stage, characteristic parameters such as turbulence intensity, Reynolds number and vorticity are detected, and the mixing time and pressure conditions during the mixing process are adjusted according to these parameters. The mixing efficiency is optimized by increasing the agitator speed and increasing the pressure pump output, ensuring efficient and uniform mixing of gases under different flow conditions. The present invention provides a solution for real-time monitoring and dynamic optimization of gas mixing, ensuring the stability and accuracy of the gas mixing process.

Description

Technical Field

[0001] The present invention relates to a special gas mixed delivery technology used in a photovoltaic plant, and is a monitoring and early warning system and method for special gas mixed delivery. Background Art

[0002] In the process of conveying and mixing special gases, it is crucial to accurately control the gas flow, pressure, temperature and mixing ratio to ensure uniform mixing of the gas and the quality stability of the final product. However, in actual operation, due to the complexity of the physical and chemical properties of the gas, especially the changes in gas density, viscosity, flow state (such as turbulence and laminar flow), rotation effect (vorticity) and other parameters, traditional gas mixing control systems are difficult to meet the requirements of high-precision and high-efficiency control. In this case, an intelligent gas mixing and transportation monitoring system becomes particularly important.

[0003] Most gas mixing systems in the prior art rely on fixed parameter control methods, lack real-time monitoring and feedback adjustment functions for gas physical properties and flow states, and are unable to cope with errors that frequently occur during the mixing of different gases.

[0004] For example, a Chinese patent with announcement number CN108227767A discloses a mixed gas concentration real-time monitoring system, including at least two mass flow control modules, a mixing module, a boosting module, a detection module and a proportional control module. The mass flow control module outputs gases of different mass flow rates, the mixing module mixes the gases of different mass flow rates output by each mass flow control module, the boosting module boosts the mixed gas, the detection module detects the concentration of the boosted mixed gas, and the proportional control module determines whether the concentration of the mixed gas meets the set concentration, and when it does not meet the set concentration, a control command is issued to the mass flow control module, so that the concentration of the mixed gas can be monitored in real time during the preparation process, thereby improving the preparation accuracy of the mixed gas and avoiding environmental pollution.

[0005] For example, a Chinese patent with the announcement number CN115825223A discloses a real-time monitoring method for gas concentration for MOCVD, which first sets the zero-point concentration, introduces the carrier gas into the acquisition module, and sets the concentration at this time as the zero-point concentration; then performs real-time mixed concentration calculation, introduces the carrier gas into the three-group source to be carried to form a mixed gas, and the acquisition module calculates the real-time transmission time of the sound wave in the mixed gas through the built-in first ultrasonic sensor and the second ultrasonic sensor, and the calculation module calculates the molar concentration of the three-group source in the mixed gas at this time according to the transmission time through the built-in algorithm model, which is the real-time mixed concentration; finally, the three-group source concentration is calculated, that is, the offset of the real-time mixed concentration relative to the zero-point concentration. A monitoring system with this monitoring method is also disclosed, which can timely and effectively measure the concentration of the three-group source in the carrier gas.

[0006] The above patents all have the problems raised by this background technology: when processing different gases or changing working conditions, they cannot respond to changes in gas characteristics in a timely manner, and therefore cannot adjust the flow opening in real time through precise control algorithms. In order to solve these problems, this application designs a monitoring and early warning system and method for special gas mixed transportation. Summary of the invention

[0007] The technical problem to be solved by the present invention is to address the deficiencies of the prior art and provide a monitoring and early warning system and method for the mixed transportation of special gases. The initial flow, pressure, temperature and mixing ratio parameters of the gas to be mixed are set, and the gas flow is monitored in real time through a flow monitoring device. If the flow does not meet the preset error threshold, the flow opening is adjusted based on the PID control algorithm. When the gas enters the mixing stage, characteristic parameters such as turbulence intensity, Reynolds number and vorticity are detected, and the mixing time and pressure conditions during the mixing process are adjusted according to these parameters. The mixing efficiency is optimized by increasing the agitator speed and increasing the pressure pump output, ensuring efficient and uniform mixing of gases under different flow conditions. The present invention provides a solution for real-time monitoring and dynamic optimization of gas mixing, ensuring the stability and accuracy of the gas mixing process.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A monitoring and early warning method for special gas mixed transportation, the specific steps include:

[0010] The initial flow rate, pressure, temperature and mixing ratio parameters of the gas to be mixed are set, and the gas to be mixed is simultaneously input into the same storage tank;

[0011] The flow rate of the gas to be mixed is monitored in real time by a flow monitoring device. If the flow rate does not meet a preset error threshold, the flow opening of the gas to be mixed is adjusted according to a PID control algorithm;

[0012] When the gas enters the mixing stage, the characteristic parameters of the gas are detected by a sensor installed in the mixing device, and the mixing time and pressure conditions during the mixing process are adjusted according to the characteristic parameters;

[0013] When concentration deviation, pressure abnormality and flow abnormality are detected in the mixed gas, the alarm mechanism is triggered, the emergency gas supply cut-off procedure is started, and the abnormal situation and handling suggestions are displayed through the human-computer interaction interface.

[0014] The setting of the initial flow rate, pressure, temperature and mixing ratio parameters of the gas to be mixed includes:

[0015] Obtain the physical and chemical properties of the gas to be mixed;

[0016] calculating an initial flow rate based on the physical property and the density difference between the gases to be mixed;

[0017] Calculating the pressure based on the physical property and the partial pressure difference between the gases to be mixed;

[0018] According to the chemical characteristics and the target mixing concentration, a mixing ratio coefficient is calculated.

[0019] The real-time monitoring of the flow rate of the gas to be mixed by the flow monitoring device includes:

[0020] Calculating a target flow rate of the gas to be mixed according to the mixing ratio parameter and the initial flow rate;

[0021] The current flow rate of the gas to be mixed is collected in real time by a flow monitoring device, the current flow rate is compared with the target flow rate, and a flow rate error is calculated;

[0022] The flow error is compared with the error threshold. If it is greater than or equal to the error threshold, it indicates that the initial flow of the gas to be mixed needs to be adjusted. If it is less than the error threshold, the flow continues to be monitored.

[0023] The step of adjusting the flow opening of the gas to be mixed according to the PID control algorithm comprises:

[0024] Analyze the viscosity and density of the mixed gas, and adjust the gain coefficient of the PID controller according to the analysis result, wherein the gain coefficient includes a proportional gain coefficient, an integral gain coefficient, and a differential gain coefficient;

[0025] The valve opening is adjusted through the proportional control part of the PID controller, the steady-state error is eliminated through the integral control part of the PID controller, and the flow error is corrected through the differential control part of the PID controller;

[0026] Combine the three parts to calculate the regulating signal of the valve opening. The calculation formula of the valve opening is: ,

[0027] in, The regulating signal indicating the valve opening, represents the proportional gain coefficient, represents the differential gain coefficient, represents the integral gain coefficient, represents the flow error at time t, Indicates differential control of the flow error at time t, Represents the cumulative flow error from the initial time to time t.

[0028] The characteristic parameters include turbulence intensity, Reynolds number and vorticity;

[0029] The turbulence intensity is used to reflect the irregularity and fluctuation degree in the gas flow. The flow velocity of the gas during the mixing process is measured by a velocity sensor installed in the mixing device, and the turbulence intensity is calculated based on the flow velocity.

[0030] The Reynolds number is a dimensionless parameter used to reflect the gas flow state. The Reynolds number in the gas mixing process is calculated by the pipe diameter, gas flow rate and gas viscosity.

[0031] The vorticity is used to reflect the intensity of gas rotation. The rotation rate of the gas flow is measured by a vortex sensor installed in the mixing device, and the vorticity is calculated based on the rotation rate.

[0032] The adjusting of mixing time and pressure conditions during the mixing process comprises:

[0033] When the turbulence intensity is detected to be greater than or equal to the fluctuation threshold, it indicates that the current fluctuation degree is high, and the mixing time is reduced by increasing the stirring speed of the stirrer in the mixing device; if the turbulence intensity is less than the fluctuation threshold, it indicates that the current fluctuation degree is low, and the mixing time is increased by reducing the stirring speed of the stirrer in the mixing device;

[0034] When the Reynolds number is detected to correspond to the laminar flow state, it means that the current mixing efficiency is low, and the mixing pressure is increased by the pressure pump to accelerate the mixing;

[0035] The mixing pressure and mixing time are optimized simultaneously according to the vortex, the stirring speed of the adjusted stirrer and the pressure of the adjusted pressure pump;

[0036] The calculation formula for mixing time adjustment is: ,

[0037] in, represents the adjusted mixing time, Indicates the initial mixing time. represents the stirring efficiency coefficient of the agitator, Indicates the stirring speed, represents the adjustment factor for turbulence intensity, represents the turbulence intensity, represents the fluctuation threshold, represents the adjustment coefficient of vorticity, represents vorticity;

[0038] The formula for calculating the mixed pressure adjustment is: ,

[0039] in, represents the adjusted mixed pressure, Indicates the initial set mixing pressure, Indicates the boosting efficiency coefficient of the pressure pump, represents the adjustment factor for the Reynolds number, represents the Reynolds number, W represents the vorticity, Represents the adjustment factor for vorticity.

[0040] A monitoring and early warning system for special gas mixed transmission, the system comprising an initial gas transmission module, a gas transmission control module, a mixed monitoring module and a monitoring and early warning module;

[0041] The initial gas delivery module is used to set the initial flow rate, pressure, temperature and mixing ratio parameters of the gas to be mixed, and simultaneously input the gas to be mixed into the same storage tank;

[0042] The gas transmission control module is provided with a flow detection strategy, which is used to monitor the flow of the gas to be mixed in real time through a flow monitoring device. If the flow does not meet a preset error threshold, the flow opening of the gas to be mixed is adjusted according to a PID control algorithm;

[0043] The mixing monitoring module is provided with a parameter adjustment strategy, which is used to detect characteristic parameters of the gas through a sensor installed in the mixing device, and adjust the mixing time and pressure conditions during the mixing process according to the characteristic parameters;

[0044] The monitoring and early warning module is used to trigger the alarm mechanism, start the emergency gas supply cut-off program, and display abnormal conditions and handling suggestions through the human-computer interaction interface.

[0045] The gas transmission control module comprises:

[0046] A flow monitoring unit, used to collect the current flow of the gas to be mixed in real time through a flow monitoring device, compare the current flow with the target flow, and calculate the flow error;

[0047] A flow control unit, which is used to adjust the valve opening through the proportional control part of the PID controller, eliminate the steady-state error through the integral control part of the PID controller, and correct the flow error through the differential control part of the PID controller when the flow error does not meet the error threshold;

[0048] The flow detection strategy includes a flow monitoring logic and a flow control logic. The flow monitoring logic is configured in the flow monitoring unit, and the flow control logic is configured in the flow control unit.

[0049] The hybrid monitoring module comprises:

[0050] A characteristic parameter calculation unit, used for calculating turbulence intensity, Reynolds number and vorticity through sensors installed in the mixing device;

[0051] A mixing parameter adjustment unit, used for adjusting the mixing time through the agitator according to the turbulence intensity and vorticity, and adjusting the mixing pressure through the pressure pump according to the Reynolds number and vorticity;

[0052] The parameter adjustment strategy includes a characteristic calculation logic and a parameter adjustment logic. The characteristic calculation logic is configured in the characteristic parameter calculation unit, and the parameter adjustment logic is configured in the hybrid parameter adjustment unit.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] 1. The present invention can ensure that each parameter in the gas mixing process is always in the optimal state by real-time monitoring of flow errors and using a PID control algorithm to adjust the flow opening, thereby avoiding the error accumulation problem under traditional fixed parameter control and improving the uniformity and accuracy of the mixed gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0056] Figure 1 A flow chart of a monitoring and early warning method for mixed transportation of special gases according to an embodiment of the present invention;

[0057] Figure 2 This is a module diagram of a monitoring and early warning system for mixed transportation of special gases according to an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0059] Embodiment 1:

[0060] See also Figure 1 The present invention provides an embodiment: a monitoring and early warning method for special gas mixed transportation, the specific steps include:

[0061] S1: according to the physical and chemical properties of the gas to be mixed, set the initial flow rate, pressure, temperature and mixing ratio parameters of the gas to be mixed;

[0062] In this step, the flow state of the gas at different pressures and temperatures is calculated based on its physical properties such as density, viscosity and specific heat capacity. For example, the initial flow rate of the gas can be adjusted according to the ideal gas equation. For different chemical components, it is ensured that no reaction or decomposition occurs during the mixing process. For example, when oxygen and flammable gas are mixed, the mixing ratio within the safety range needs to be considered. In combination with the physical and chemical properties, the initial flow rate, pressure, temperature and mixing ratio parameters of each gas are set through the central controller (PLC);

[0063] S2: monitor the flow rate of the gas to be mixed in real time through a flow monitoring device to determine whether it meets a preset error threshold;

[0064] In this step, the installed high-precision flow sensor can detect the flow rate of each gas in real time, and the data collection frequency is at the millisecond level, ensuring that the monitored flow data is timely and accurate;

[0065] S3: If the preset error threshold is not met, the flow opening of the gas to be mixed is adjusted according to the PID control algorithm;

[0066] S4: When the gas enters the mixing stage, the characteristic parameters of the gas are detected by the sensor installed in the mixing device;

[0067] In this step, the characteristic parameters include turbulence intensity, Reynolds number and vorticity, which can be monitored in real time by the velocity sensor and vorticity sensor installed in the mixing device. Each parameter has an important influence on the uniformity and efficiency of gas mixing;

[0068] Sensors are installed in key mixing areas, especially where the gas enters the tank, through the interconnecting pipes, and at different locations in the mixing chamber to obtain more accurate gas flow data;

[0069] S5: adjusting the mixing time and pressure conditions during the mixing process according to the characteristic parameters;

[0070] S6: When concentration deviation, pressure anomaly and flow anomaly of the mixed gas are detected, the alarm mechanism is triggered;

[0071] The state of the mixed gas is detected in real time through the concentration sensor, pressure sensor and flow sensor. If it is detected that the concentration of the mixed gas deviates from the set value, the pressure is abnormally high or the flow exceeds the preset range, an alarm will be triggered immediately;

[0072] When an alarm is triggered, detailed information about the abnormal situation will be displayed and the operator will be alerted through an audible and visual alarm. At the same time, adjustments will be automatically made, such as stopping the gas supply or reducing the mixing pressure, to prevent further system failures.

[0073] The alarm system also provides operators with treatment suggestions, such as recalibrating sensors or manually adjusting mixing parameters, to quickly restore the system to normal operating conditions;

[0074] The specific steps of S1 are as follows:

[0075] S1.1: Obtain the physical properties of density, viscosity, molecular weight and specific heat capacity of each gas to be mixed, and obtain the chemical reactivity, toxicity and compatibility of each gas to be mixed;

[0076] Density and viscosity values ​​can be obtained from reference tables pre-stored in the database, and other data can be obtained through experimental determination;

[0077] Ensure that the parameters of the mixing process are set in accordance with the gas characteristics to avoid unnecessary reactions or changes in physical state between gases;

[0078] S1.2: Based on the density difference of the gases to be mixed, the initial flow rate can be estimated through the basic principles of physical fluid mechanics. For example, the larger the density difference between the two gases, the more the initial flow rate should be adjusted according to the gas with higher density to avoid uneven flow during the mixing process;

[0079] By comparing the density difference of different gases, a pre-set fluid velocity correction table is used to make a preliminary estimate of the flow rate, and the sensor is combined with real-time flow feedback to ensure uniform mixing of gases with different densities.

[0080] Consideration of density difference ensures that high-density gas will not settle during the mixing process due to its weight, and low-density gas will not float on the top, so that the initial balance of flow can be achieved and the subsequent mixing effect can be guaranteed;

[0081] S1.3: When setting the pressure, the calculation is based on the difference in the partial pressures of the two gases. The partial pressure of a gas refers to the partial pressure of each gas in the mixed gas. According to Dalton's law, the total pressure of the gas is equal to the sum of the partial pressures of each component gas.

[0082] Use online pressure sensors to monitor the partial pressure of each gas in real time, set the target pressure based on these partial pressure differences, and adjust the initial pressure in combination with PID control to ensure that the pressure conditions are suitable for safe mixing of the two gases;

[0083] By considering the partial pressure difference, it is possible to avoid over- or under-compression of the gas during the mixing process, thereby ensuring that the gas is mixed at a stable pressure and avoiding physical or chemical changes in the gas;

[0084] For example, when the initial partial pressure of gas A is low and the initial partial pressure of gas B is high, the pressure of gas B is adjusted by the pressure pump to be slightly lower than the partial pressure when it exists alone, so as to avoid excessive compression during the mixing process;

[0085] S1.4: The core of gas mixing is to set a reasonable mixing ratio so that the mixed gas can reach the target concentration. The mixing ratio is set by considering the chemical properties of each gas, such as reactivity and adsorption. According to the chemical activity of different gases, a specific chemical model is used to calculate their reaction rates at different concentrations to avoid undesirable chemical reactions during the mixing process.

[0086] Real-time detection of changes in the chemical properties of gases, automatic adjustment of the ratio of each gas, so that the concentration of the final gas mixture reaches the desired target. For example, some chemical gases have high reactivity, which will reduce their initial concentration, so that the overall concentration after mixing remains safe;

[0087] In the mixed reaction, the optimal gas mixing ratio is calculated based on the chemical reaction equilibrium constant and the target reaction concentration;

[0088] The flow error is caused by the difference between the actual flow and the target flow. The flow sensor can accurately capture the gas flow, while the target flow is determined by the preset mixing ratio and initial flow. When the actual flow deviates from the target flow, the specific error value will be calculated. S2 specifically includes the following steps:

[0089] S2.1: Based on the set mixing ratio and initial flow rate, the target flow rate of each gas will be calculated. The target flow rate is set based on the preset mixing ratio and the initial physical properties of the gas. The target flow rate is the core data to ensure that two or more gases can enter the mixing device in the expected proportion;

[0090] First, calculate the target flow rate of the gas to be mixed according to the mixing ratio. For example, for two gases, gas A and gas B, if the target mixing ratio is 2:1, the total flow rate is 75m³ / s, and the initial flow rate of gas A is set to 50m³ / s, then the target flow rate of gas B should be set to 25m³ / s.

[0091] This step ensures the accuracy and stability of gas mixing through clear target flow calculation, reduces the deviation of mixing ratio caused by flow error, and guarantees the final quality of the mixed gas;

[0092] S2.2: The current flow rate of the gas to be mixed is collected in real time through high-precision flow sensors. The sensors are installed on each gas input pipeline to ensure that the flow rate of each gas can be accurately measured. Through high-speed data acquisition technology, flow information can be obtained within millisecond time intervals and the data can be transmitted to the central control unit for processing;

[0093] The digital high-precision flow sensor is used to capture the instantaneous changes in flow and perform data correction in combination with temperature and pressure compensation. The sensor can not only measure the volume flow, but also calculate the mass flow in combination with temperature and pressure, so as to more accurately reflect the flow state of the gas;

[0094] It ensures the real-time and accuracy of flow monitoring, can capture the changes of gas flow in time, and ensures the stability of the mixing process. The accurate measurement of the flow sensor can greatly improve the response speed to the gas flow.

[0095] S2.3: After collecting the current flow in real time, compare the current flow with the previously set target flow and calculate the error between the two. The flow error refers to the difference between the current actual flow and the target flow. This error reflects the accuracy of flow control during the gas mixing process.

[0096] S2.4: Set a predetermined error threshold as a criterion for determining whether flow regulation is required. The size of the error threshold is determined by the process requirements of the mixed gas and can usually be adjusted through parameter settings. For example, in some precision processes, the error threshold may need to be controlled within ±0.5%, while for other less precise processes, the error threshold may be set to ±2%;

[0097] If the flow error is detected to be greater than or equal to the preset error threshold, it indicates that the deviation of the gas flow has exceeded the allowable range, and the initial gas flow will be adjusted through the PID control algorithm;

[0098] If the flow error is less than the preset error threshold, the current state will be maintained and the flow will continue to be monitored so as to respond to possible future fluctuations at any time;

[0099] When a gas with a higher viscosity flows, the friction resistance is larger. Therefore, it is necessary to speed up the response to the flow error by increasing the proportional gain coefficient to compensate for the delay caused by viscosity. The flow inertia of a gas with a higher density is large, which can easily lead to oscillation in the mixing process. Therefore, the differential gain coefficient needs to be appropriately increased to correct the trend of error changes in advance and reduce fluctuations. The gain coefficient of the PID controller can be dynamically adjusted according to different physical characteristics to ensure that the flow opening can be adjusted adaptively. This control method effectively improves the stability and accuracy of the gas mixing process, reduces the adverse effects of flow fluctuations, and improves the consistency and mixing effect of the product. The specific steps of S3 are as follows:

[0100] S3.1: In the process of adjusting the flow opening of the mixed gas, the viscosity and density of the gas are two important physical properties. These parameters directly affect the resistance and flow rate of the gas flow, and then affect the response speed of the flow control. The viscosity sensor and density sensor installed in the intake pipe are used to collect these two parameters in real time;

[0101] The viscosity and density data obtained from the analysis will be used to adjust the proportional, integral and differential gain coefficients in the PID controller to ensure that the system's response speed and control accuracy can reach the optimal state under different working conditions;

[0102] S3.2: The core of the PID controller lies in the setting of its gain coefficient, which will be adjusted according to the viscosity and density of the gas to be mixed, including the proportional gain coefficient, the integral gain coefficient and the differential gain coefficient;

[0103] For example, when the viscosity of the gas is high, the proportional gain coefficient and the integral gain coefficient are increased to speed up the response to the flow error; when the density of the gas is high, the differential gain coefficient is increased to reduce the amplitude of the flow fluctuation;

[0104] The gain coefficient is adjusted based on the real-time monitoring results of viscosity and density. By embedding an intelligent adjustment algorithm, the three parameters can be dynamically adjusted according to the physical property data fed back by the sensor to ensure that the control response characteristics of different gases meet the optimal control requirements;

[0105] By adjusting the gain coefficient, it can quickly adapt to changes in gas characteristics, reduce the response delay and error accumulation of the control system, and avoid flow control inaccuracy caused by differences in gas physical properties;

[0106] S3.3: Proportional control adjusts the valve opening through the real-time feedback of the flow error. According to the current flow error, the valve opening is adjusted through the proportional gain coefficient to quickly respond to flow changes.

[0107] Integral control is used to eliminate steady-state errors, that is, the accumulated errors that occur during long-term operation. Through the integral gain coefficient, the long-term deviation of the flow rate can be gradually corrected to ensure that the flow rate can operate stably near the set value for a long time.

[0108] Differential control is used to detect the rate of change of flow error, that is, to predict the trend of flow error. Through the differential gain coefficient, adjustments can be made in advance to prevent excessive fluctuations in flow or too fast adjustments;

[0109] The three parts of the PID controller each have different functions, but they are all adjusted through the gain coefficient of physical property analysis. The proportional control part can respond to errors quickly; the integral control part eliminates error accumulation; and the differential control part can reduce oscillation and improve the smoothness of regulation;

[0110] S3.4: Combine the calculation results of proportional control, integral control and differential control to generate a valve opening adjustment signal. According to the signal, the valve opening is adjusted in real time to keep the gas flow rate near the target value. The valve opening adjustment formula is: ,

[0111] in, The regulating signal indicating the valve opening, represents the proportional gain coefficient, represents the differential gain coefficient, represents the integral gain coefficient, represents the flow error at time t, Indicates differential control of the flow error at time t, Represents the cumulative flow error from the initial time to time t;

[0112] The characteristic parameters include turbulence intensity, Reynolds number and vorticity;

[0113] The turbulence intensity is used to reflect the irregularity and fluctuation degree in the gas flow. The flow velocity of the gas during the mixing process is measured by a velocity sensor installed in the mixing device, and the turbulence intensity is calculated based on the flow velocity.

[0114] The Reynolds number is a dimensionless parameter used to reflect the gas flow state. The Reynolds number in the gas mixing process is calculated by the pipe diameter, gas flow rate and gas viscosity.

[0115] The vorticity is used to reflect the intensity of gas rotation. The rotation rate of the gas flow is measured by a vortex sensor installed in the mixing device, and the vorticity is calculated based on the rotation rate;

[0116] The specific steps of S5 are as follows:

[0117] S5.1: The turbulence intensity of the gas is monitored in real time by a speed sensor installed in the mixing device. When the turbulence intensity is detected to be higher than or equal to a preset fluctuation threshold, it is automatically determined that the flow fluctuation in the gas mixing process is high. At this time, in order to speed up the mixing process, the mixing time is reduced by increasing the stirring speed of the stirrer in the mixing device. By adjusting the stirring speed in real time, the mixing time can be effectively shortened to avoid excessive mixing or uneven mixing caused by excessive turbulence;

[0118] When the turbulence intensity is detected to be greater than or equal to the fluctuation threshold, it indicates that the current fluctuation degree is high, and the mixing time is reduced by increasing the stirring speed of the stirrer in the mixing device; if the turbulence intensity is less than the fluctuation threshold, it indicates that the current fluctuation degree is low, and the mixing time is increased by reducing the stirring speed of the stirrer in the mixing device;

[0119] S5.2: The Reynolds number is calculated in real time based on the flow rate, pipe diameter and gas viscosity. The Reynolds number reflects the state of gas flow. The lower the value, the closer the gas flow is to the laminar state, and the mixing efficiency will also decrease. When the Reynolds number indicates that the gas is in a laminar state, the output pressure of the pressure pump is increased to increase the flow rate of the gas, thereby accelerating the mixing process. This regulation method significantly improves the mixing efficiency by increasing the mixing pressure and causing the gas to transition from a laminar state to a turbulent state.

[0120] S5.3: Vorticity is a reflection of the intensity of gas flow rotation. When the vorticity is large, the mixing process of the gas will intensify the internal rotation, which may affect the mixing uniformity. In order to optimize the mixing time and pressure, the system will jointly adjust the speed of the agitator and the output of the pressure pump according to the vorticity value. Specifically, when the vorticity is high, the mixing time will be reduced and the pressure will be increased to ensure that the gas is mixed evenly in a shorter time; when the vorticity is low, the mixing time will be extended and the pressure will be reduced to prevent flow instability caused by excessive stirring;

[0121] The mixing pressure and mixing time are optimized simultaneously according to the vortex, the stirring speed of the adjusted stirrer and the pressure of the adjusted pressure pump;

[0122] The calculation formula for mixing time adjustment is: ,

[0123] in, represents the adjusted mixing time, Indicates the initial mixing time. represents the stirring efficiency coefficient of the agitator, Indicates the stirring speed, represents the adjustment factor for turbulence intensity, represents the turbulence intensity, represents the fluctuation threshold, represents the adjustment coefficient of vorticity, represents vorticity;

[0124] The formula for calculating the mixed pressure adjustment is: ,

[0125] in, represents the adjusted mixed pressure, Indicates the initial set mixing pressure, Indicates the boosting efficiency coefficient of the pressure pump, represents the adjustment factor for the Reynolds number, represents the Reynolds number, W represents the vorticity, Represents the adjustment factor for vorticity.

[0126] Embodiment 2:

[0127] See also Figure 2 , the present invention provides an embodiment: a monitoring and early warning system for special gas mixed transmission, the system comprising an initial gas transmission module, a gas transmission control module, a mixed monitoring module and a monitoring and early warning module;

[0128] The initial gas delivery module is used to set the initial flow rate, pressure, temperature and mixing ratio parameters of the gas to be mixed, and simultaneously input the gas to be mixed into the same storage tank;

[0129] The gas transmission control module is provided with a flow detection strategy, which is used to monitor the flow of the gas to be mixed in real time through a flow monitoring device. If the flow does not meet a preset error threshold, the flow opening of the gas to be mixed is adjusted according to a PID control algorithm;

[0130] The mixing monitoring module is provided with a parameter adjustment strategy, which is used to detect characteristic parameters of the gas through a sensor installed in the mixing device, and adjust the mixing time and pressure conditions during the mixing process according to the characteristic parameters;

[0131] The monitoring and early warning module is used to trigger the alarm mechanism, start the emergency gas supply cut-off program, and display abnormal conditions and handling suggestions through the human-computer interaction interface.

[0132] The gas transmission control module comprises:

[0133] A flow monitoring unit, used to collect the current flow of the gas to be mixed in real time through a flow monitoring device, compare the current flow with the target flow, and calculate the flow error;

[0134] A flow control unit, which is used to adjust the valve opening through the proportional control part of the PID controller, eliminate the steady-state error through the integral control part of the PID controller, and correct the flow error through the differential control part of the PID controller when the flow error does not meet the error threshold;

[0135] The flow detection strategy includes a flow monitoring logic and a flow control logic. The flow monitoring logic is configured in the flow monitoring unit, and the flow control logic is configured in the flow control unit.

[0136] The hybrid monitoring module comprises:

[0137] A characteristic parameter calculation unit, used for calculating turbulence intensity, Reynolds number and vorticity through sensors installed in the mixing device;

[0138] A mixing parameter adjustment unit, used for adjusting the mixing time through the agitator according to the turbulence intensity and vorticity, and adjusting the mixing pressure through the pressure pump according to the Reynolds number and vorticity;

[0139] The parameter adjustment strategy includes a characteristic calculation logic and a parameter adjustment logic. The characteristic calculation logic is configured in the characteristic parameter calculation unit, and the parameter adjustment logic is configured in the hybrid parameter adjustment unit.

[0140] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A monitoring and early warning method for special gas mixed transportation, characterized in that: The method comprises: The initial flow rate, pressure, temperature and mixing ratio parameters of the gas to be mixed are set, and the gas to be mixed is simultaneously input into the same storage tank; The flow rate of the gas to be mixed is monitored in real time by a flow monitoring device. If the flow rate does not meet a preset error threshold, the flow opening of the gas to be mixed is adjusted according to a PID control algorithm; When the gas enters the mixing stage, the characteristic parameters of the gas are detected by a sensor installed in the mixing device, and the mixing time and pressure conditions during the mixing process are adjusted according to the characteristic parameters; When concentration deviation, pressure abnormality and flow abnormality of the mixed gas are detected, the alarm mechanism is triggered, the emergency gas supply cut-off procedure is started, and the abnormal situation and treatment suggestions are displayed through the human-computer interaction interface; The characteristic parameters include turbulence intensity, Reynolds number and vorticity; The turbulence intensity is used to reflect the irregularity and fluctuation degree in the gas flow. The flow velocity of the gas during the mixing process is measured by a velocity sensor installed in the mixing device, and the turbulence intensity is calculated based on the flow velocity. The Reynolds number is a dimensionless parameter used to reflect the gas flow state. The Reynolds number in the gas mixing process is calculated by the pipe diameter, gas flow rate and gas viscosity. The vorticity is used to reflect the intensity of gas rotation. The rotation rate of the gas flow is measured by a vortex sensor installed in the mixing device, and the vorticity is calculated based on the rotation rate; The adjusting of mixing time and pressure conditions during the mixing process comprises: When the turbulence intensity is detected to be greater than or equal to the fluctuation threshold, it indicates that the current fluctuation degree is high, and the mixing time is reduced by increasing the stirring speed of the stirrer in the mixing device; if the turbulence intensity is less than the fluctuation threshold, it indicates that the current fluctuation degree is low, and the mixing time is increased by reducing the stirring speed of the stirrer in the mixing device; When the Reynolds number is detected to correspond to the laminar flow state, it means that the current mixing efficiency is low, and the mixing pressure is increased by the pressure pump to accelerate the mixing; The mixing pressure and mixing time are optimized simultaneously according to the vortex, the stirring speed of the adjusted stirrer and the pressure of the adjusted pressure pump; The calculation formula for mixing time adjustment is: ， in, represents the adjusted mixing time, Indicates the initial mixing time. represents the stirring efficiency coefficient of the agitator, Indicates the stirring speed, represents the adjustment factor for turbulence intensity, represents the turbulence intensity, represents the fluctuation threshold, represents the adjustment coefficient of vorticity, represents vorticity; The formula for calculating the mixed pressure adjustment is: ， in, represents the adjusted mixed pressure, Indicates the initial set mixing pressure, Indicates the boosting efficiency coefficient of the pressure pump, represents the adjustment factor for the Reynolds number, represents the Reynolds number, W represents the vorticity, Represents the adjustment factor for vorticity.

2. A monitoring and early warning method for special gas mixed transportation according to claim 1, characterized in that: The setting of the initial flow rate, pressure, temperature and mixing ratio parameters of the gas to be mixed includes: Obtain the physical and chemical properties of the gas to be mixed; calculating an initial flow rate based on the physical property and the density difference between the gases to be mixed; Calculating the pressure based on the physical property and the partial pressure difference between the gases to be mixed; According to the chemical characteristics and the target mixing concentration, a mixing ratio coefficient is calculated.

3. A monitoring and early warning method for special gas mixed transportation according to claim 1, characterized in that: The real-time monitoring of the flow rate of the gas to be mixed by the flow monitoring device includes: Calculating a target flow rate of the gas to be mixed according to the mixing ratio parameter and the initial flow rate; The current flow rate of the gas to be mixed is collected in real time by a flow monitoring device, the current flow rate is compared with the target flow rate, and a flow rate error is calculated; The flow error is compared with the error threshold. If it is greater than or equal to the error threshold, it indicates that the initial flow of the gas to be mixed needs to be adjusted. If it is less than the error threshold, the flow continues to be monitored.

4. A monitoring and early warning method for special gas mixed transportation according to claim 3, characterized in that: The step of adjusting the flow opening of the gas to be mixed according to the PID control algorithm comprises: Analyze the viscosity and density of the mixed gas, and adjust the gain coefficient of the PID controller according to the analysis result, wherein the gain coefficient includes a proportional gain coefficient, an integral gain coefficient, and a differential gain coefficient; The valve opening is adjusted through the proportional control part of the PID controller, the steady-state error is eliminated through the integral control part of the PID controller, and the flow error is corrected through the differential control part of the PID controller; Combine the three parts to calculate the regulating signal of the valve opening. The calculation formula of the valve opening is: ， in, The regulating signal indicating the valve opening, represents the proportional gain coefficient, represents the differential gain coefficient, represents the integral gain coefficient, represents the flow error at time t, Indicates differential control of the flow error at time t, Represents the cumulative flow error from the initial time to time t.

5. A monitoring and early warning system for mixed transportation of special gases, based on a monitoring and early warning method for mixed transportation of special gases as claimed in any one of claims 1 to 4, characterized in that: The system includes an initial gas transmission module, a gas transmission control module, a mixing monitoring module and a monitoring and early warning module; The initial gas delivery module is used to set the initial flow rate, pressure, temperature and mixing ratio parameters of the gas to be mixed, and simultaneously input the gas to be mixed into the same storage tank; The gas transmission control module is provided with a flow detection strategy, which is used to monitor the flow of the gas to be mixed in real time through a flow monitoring device. If the flow does not meet a preset error threshold, the flow opening of the gas to be mixed is adjusted according to a PID control algorithm; The mixing monitoring module is provided with a parameter adjustment strategy, which is used to detect characteristic parameters of the gas through a sensor installed in the mixing device, and adjust the mixing time and pressure conditions during the mixing process according to the characteristic parameters; The monitoring and early warning module is used to trigger the alarm mechanism, start the emergency gas supply cut-off procedure, and display abnormal conditions and handling suggestions through the human-computer interaction interface; The hybrid monitoring module comprises: A characteristic parameter calculation unit, used for calculating turbulence intensity, Reynolds number and vorticity through sensors installed in the mixing device; A mixing parameter adjustment unit, used for adjusting the mixing time through the agitator according to the turbulence intensity and vorticity, and adjusting the mixing pressure through the pressure pump according to the Reynolds number and vorticity; The parameter adjustment strategy includes a characteristic calculation logic and a parameter adjustment logic. The characteristic calculation logic is configured in the characteristic parameter calculation unit, and the parameter adjustment logic is configured in the hybrid parameter adjustment unit.

6. A monitoring and early warning system for special gas mixed transportation according to claim 5, characterized in that: The gas transmission control module comprises: A flow monitoring unit, used to collect the current flow of the gas to be mixed in real time through a flow monitoring device, compare the current flow with the target flow, and calculate the flow error; A flow control unit, which is used to adjust the valve opening through the proportional control part of the PID controller, eliminate the steady-state error through the integral control part of the PID controller, and correct the flow error through the differential control part of the PID controller when the flow error does not meet the error threshold; The flow detection strategy includes a flow monitoring logic and a flow control logic. The flow monitoring logic is configured in the flow monitoring unit, and the flow control logic is configured in the flow control unit.

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