Intelligent sampling system and control method for hazardous chemical storage tank

Abstract

The application relates to the field of sampling control and discloses an intelligent sampling system for a dangerous chemical product storage tank and a control method, which comprises a storage tank, a sampling cylinder, a steel wire rope, a winding roller box, a driving motor and a sampling control box. The winding roller box is internally provided with a winding roller. The storage tank and the winding roller box are both provided with a sampling port and are connected through flanges. The sampling cylinder is connected with one end of the steel wire rope, and the other end of the steel wire rope is wound on the winding roller. The driving shaft of the driving motor is fixedly connected with the winding roller in an axial direction. The sampling control box is electrically connected with the driving motor and is used for controlling the sampling speed. The storage tank is further provided with a high-frequency radar liquid level meter which is used for detecting the liquid level height in the storage tank. The outer wall of the sampling cylinder is further provided with a counterweight which is used for sinking the sampling cylinder to a specified depth. Through the technical scheme, the problem that the inlet of the telescopic sampling tube is easily blocked and the residual medium in the tube is difficult to clean completely when the telescopic sampling tube is used to sample high-viscosity and particle-containing dangerous chemical products is solved.

Description

Technical Field

[0001] This application relates to the technical field of sampling control, specifically to an intelligent sampling system and control method for hazardous chemical storage tanks. Background Technology

[0002] Liquid hazardous chemicals may undergo changes in properties during long-term storage due to factors such as temperature changes, pressure fluctuations, and evaporation of the medium, resulting in a decline in their quality. Therefore, regular sampling and testing are necessary to ensure the quality stability of the final product.

[0003] Most current sampling methods involve creating sampling holes in the storage tank, installing sampling pipes and valves through these holes, and opening the valves when sampling is needed to allow the liquid hazardous chemicals to flow into a collection bottle through the pipes. While this method is simple, it cannot meet the sampling requirements at different depths within the storage tank. Therefore, existing technologies have proposed a sampling structure using a telescopic sampling tube. This structure involves installing a telescopic sampling tube, which can be raised and lowered by a traction mechanism, inside the sealed tank storing the liquid hazardous chemicals. One end of the tube is set as the sampling port, and the other end extends out of the tank and connects to the sampling device. By controlling the traction mechanism, the height of the telescopic sampling tube inside the tank can be adjusted, thereby achieving sampling at different depths.

[0004] However, when dealing with hazardous chemicals with high viscosity and particulate impurities, the inlet of the aforementioned telescopic sampling tube is easily blocked, making it difficult to sample effectively. In addition, after sampling, the residual medium inside the tube is difficult to clean thoroughly, which can lead to contamination of subsequent samples. Summary of the Invention

[0005] To address the problem that current telescopic sampling tubes are prone to clogging at the inlet and difficult to thoroughly clean residual media inside when dealing with high-viscosity hazardous chemicals containing particulate impurities, this application provides an intelligent sampling system and control method for hazardous chemical storage tanks.

[0006] In a first aspect, this application provides an intelligent sampling system for hazardous chemical storage tanks, including a storage tank, a sampling cylinder, a wire rope, a roller box, a drive motor, and a sampling control box. The roller box contains a roller, wherein:

[0007] Both the storage tank and the roller box are equipped with sampling ports and are connected by flanges;

[0008] The sampling cylinder is connected to one end of the wire rope, and the other end of the wire rope is wound around the roller;

[0009] The drive shaft of the drive motor is axially fixedly connected to the roller;

[0010] The sampling control box is electrically connected to the drive motor and is used to control the sampling speed;

[0011] The storage tank is also equipped with a high-frequency radar level gauge for detecting the liquid level inside the storage tank;

[0012] The outer wall of the sampling tube is also provided with a counterweight to allow the sampling tube to sink to a specified depth.

[0013] Optionally, a miniature electrostatic induction probe is also installed on the outer wall of the sampling tube, wherein the miniature electrostatic induction probe is used to detect the charge generated on the surface of the sampling tube.

[0014] Optionally, a high-frequency current sensor is connected in series with the grounding terminal of the roller box to detect the current flowing to the grounding terminal.

[0015] Secondly, this application provides an intelligent sampling control method for hazardous chemical storage tanks, applied in the sampling control box described in any one of the first aspects, the method comprising:

[0016] Based on the electrical data collected by the miniature electrostatic induction probe and the high-frequency current sensor, the charge generation rate and charge dissipation rate on the surface of the sampling tube are determined.

[0017] Determine whether the charge generation rate is greater than the charge dissipation rate;

[0018] If so, then obtain the sampling depth of the sampling cylinder;

[0019] Based on the sampling depth and the liquid level in the storage tank, the target sampling rate of the sampling cylinder is determined;

[0020] The power of the drive motor is adjusted according to the target sampling speed.

[0021] Optionally, determining the target sampling rate of the sampling cylinder based on the sampling depth specifically involves:

[0022] If the sampling depth is below the liquid level in the storage tank, the flow state of the liquid hazardous chemical is determined based on the current sampling speed of the sampling cylinder.

[0023] Calculate the viscous resistance of the liquid hazardous chemical to the sampling cylinder based on the flow state of the liquid hazardous chemical;

[0024] The cumulative potential energy is calculated based on the viscous resistance and sampling depth.

[0025] The target sampling rate of the sampling tube is calculated based on the safe energy threshold of the hazardous liquid.

[0026] Optionally, determining the target sampling rate of the sampling cylinder based on the sampling depth further includes:

[0027] If the sampling depth is above the liquid level in the tank, then determine whether the charge dissipation rate is greater than or equal to a preset threshold.

[0028] If not, then the first sampling rate adjustment coefficient is obtained based on the ratio of the charge dissipation rate to the charge generation rate;

[0029] Based on the first sampling rate adjustment coefficient, the current sampling rate is adjusted to obtain the target sampling rate of the sampling cylinder.

[0030] Optionally, determining whether the charge generation rate is greater than or equal to a preset threshold further includes:

[0031] If the charge dissipation rate is greater than or equal to a preset threshold, the residual thickness of the liquid film on the sampling tube is calculated based on the current sampling rate.

[0032] Obtain the gas concentration and temperature inside the storage tank;

[0033] The liquid film evaporation rate is determined based on the gas phase concentration and the temperature.

[0034] The liquid film residue coefficient is determined based on the liquid film residue thickness and the liquid film evaporation rate.

[0035] The charge dissipation rate is adjusted based on the liquid film residual coefficient to obtain the risk charge dissipation rate;

[0036] The second sampling rate adjustment coefficient is obtained based on the ratio of the risk charge dissipation rate to the charge generation rate.

[0037] Based on the second sampling rate adjustment coefficient, the current sampling rate is adjusted to obtain the target sampling rate of the sampling cylinder.

[0038] Thirdly, this application provides an intelligent sampling control device for hazardous chemical storage tanks. The device is a sampling control box, which includes an acquisition module, a processing module, and a control module, wherein:

[0039] The acquisition module is used to determine the charge generation rate and charge dissipation rate on the surface of the sampling tube based on the electrical data collected by the miniature electrostatic induction probe and the high-frequency current sensor.

[0040] The processing module is used to determine whether the charge generation rate is greater than the charge dissipation rate; if so, it obtains the sampling depth of the sampling tube; and based on the sampling depth and the liquid level in the storage tank, it determines the target sampling speed of the sampling tube.

[0041] The control module is used to adjust the power of the drive motor according to the target sampling speed.

[0042] Thirdly, this application provides an electronic device including a processor, a memory, a user interface, and a network interface. The memory is used to store instructions, the user interface and the network interface are used to communicate with other devices, and the processor is used to execute the instructions stored in the memory to cause the electronic device to perform the method as described in any one of the second aspects.

[0043] Fourthly, this application provides a computer-readable storage medium storing instructions that, when executed, perform the method described in any one of the second aspects.

[0044] In summary, one or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0045] 1. The intelligent sampling system for hazardous chemical storage tanks proposed in this application connects a sampling port flange at the top of the storage tank to a roller box. A roller is installed inside the roller box and is driven by a drive motor to rotate. A steel wire rope is wound around the roller, and the other end of the steel wire rope is connected to a sampling cylinder. A counterweight is installed on the sampling cylinder. When sampling is required, the drive motor drives the roller to rotate, releasing the steel wire rope. The sampling cylinder reaches the designated depth for sampling under gravity. After sampling, the drive motor controls the roller to retract the steel wire rope, and the sampling cylinder retracts into the roller box under tension. At this point, the operator can remove the sampling cylinder. Throughout the process, the counterweight allows the sampling cylinder to be lowered to the designated depth in highly viscous hazardous chemicals. Furthermore, the sampling cylinder structure used in this application does not require suction sampling like a telescopic sampling tube, making it convenient to operate and easy to clean, effectively solving the sampling problems faced by telescopic sampling tubes.

[0046] 2. In the intelligent sampling system for hazardous chemical storage tanks proposed in this application, the raising and lowering of the sampling cylinder causes friction between the surface of the sampling cylinder and the hazardous chemical liquid, resulting in static electricity. Especially when the raising and lowering speed of the sampling cylinder is relatively fast, the rate of charge adhesion and peeling on the cylinder wall exceeds the rate of charge dissipation through grounding. This generates a large local potential difference. Since hazardous chemicals are flammable and explosive, this poses an explosion risk. Therefore, this application monitors the charge generation rate and charge dissipation rate of the sampling cylinder in real time. Once the charge generation rate exceeds the charge dissipation rate, it indicates a risk of static electricity generation. At this time, a sampling speed adjustment mechanism is triggered. Specifically, the motion environment of the sampling cylinder is determined based on the current sampling depth and the liquid level in the storage tank. Then, the corresponding sampling speed is determined based on the electrostatic generation / dissipation mechanism of different motion environments. Finally, the power of the drive motor is adjusted according to the sampling speed to ensure that the charge generation rate is less than or equal to the charge dissipation rate, thereby reducing the explosion risk caused by static electricity accumulation. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of an intelligent sampling system for hazardous chemical storage tanks provided in an embodiment of this application.

[0048] Figure 2 This is a flowchart illustrating an intelligent sampling control method for hazardous chemical storage tanks provided in an embodiment of this application.

[0049] Figure 3 This is a schematic diagram of the structure of an intelligent sampling control device for hazardous chemical storage tanks provided in an embodiment of this application.

[0050] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0051] Explanation of reference numerals in the attached diagram: 1. Counterweight; 2. Miniature electrostatic induction probe; 3. Sampling cylinder; 4. Steel wire rope; 5. Storage tank; 6. Flange; 7. Drive motor; 8. High-frequency current sensor; 9. Sampling control box; 91. Acquisition module; 92. Processing module; 93. Control module; 10. Roller box; 11. Roller; 400. Electronic equipment; 401. Processor; 402. Communication bus; 403. User interface; 404. Network interface; 405. Memory. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0053] This application provides an intelligent sampling system for hazardous chemical storage tanks, such as... Figure 1 As shown, it includes a storage tank 5, a sampling cylinder 3, a wire rope 4, a roller box 10, a drive motor 7, and a sampling control box 9, wherein:

[0054] Sampling ports are provided on the upper wall of the storage tank 5 and the lower wall of the roller box 10. The sampling ports on the upper wall of the storage tank 5 and the sampling ports on the lower wall of the roller box 10 are connected by flanges 6 to ensure the sealing of the sampling ports and facilitate the installation, disassembly and replacement of the roller box 10. Then, a roller 11 is installed inside the roller box 10. One end of the wire rope 4 is wound on the roller 11, and the other end of the wire rope 4 is connected to the sampling cylinder 3. The sampling cylinder 3 is suspended in the middle of the sampling port. When the roller 11 rotates, the wire rope 4 can be retracted and released. When the wire rope 4 is retracted, the sampling cylinder 3 moves upward under the tension of the wire rope 4. When the roller 11 is released, the sampling cylinder 3 moves downward under the action of gravity. A drive hole is provided on the side wall of the roller box 10. The drive shaft of the drive motor 7 passes through the drive hole and is axially fixedly connected to the roller 11. When the drive motor 7 is started, it can drive the roller 11 to rotate. The drive motor 7 is electrically connected to the sampling control box 9. The sampling control box 9 controls the power of the drive motor 7, and thus controls the rotation speed of the roller 11. The greater the rotation speed of the roller 11, the faster the sampling cylinder 3 can be wound up and unwound.

[0055] To facilitate users in viewing the sampling depth in real time, a high-frequency radar level gauge is also installed inside the storage tank 5. The high-frequency radar level gauge is used to detect the liquid level height inside the storage tank 5 and then display the liquid level height on the display of the sampling control box 9.

[0056] The outer wall of the sampling tube 3 is also equipped with a counterweight 1, which can make the sampling tube 3 sink to the specified sampling depth when sampling liquids with high viscosity.

[0057] The implementation principle of the above-mentioned intelligent sampling system is as follows: When sampling is required, the user selects the sampling mode on the sampling control box 9. The sampling modes include automatic mode and manual mode. When the user selects manual mode, the user first selects the sampling speed, and then controls the rise and fall of the sampling cylinder 3 through the up or down button. When the user selects automatic mode, the user needs to select the sampling depth. Then the sampling control box 9 configures the sampling speed according to the sampling depth, and then controls the power of the drive motor 7 according to the sampling speed. After the drive motor 7 starts, the drive shaft rotates and drives the roller 11 to rotate. The rotation of the roller 11 drives the steel wire rope 4 to be released. The sampling cylinder 3 reaches the sampling depth selected by the user under the action of gravity. After the sampling cylinder 3 has collected the hazardous chemical sample at the sampling depth, the drive motor 7 drives the roller 11 to rotate in the opposite direction and retrieve the steel wire rope 4. The sampling cylinder 3 moves upward under the tension of the steel wire rope 4 until it reaches the roller box 10. At this time, the user can open the roller box 10 to take away the hazardous chemical sample and complete the sampling.

[0058] During the up-and-down movement of the sampling tube 3 within the storage tank 5, both the high-viscosity liquid and gas molecules of the hazardous chemicals will transfer charge with the outer wall of the sampling tube 3 due to relative motion, thereby generating static electricity. This greatly increases the explosion risk for some unstable hazardous chemicals. Therefore, in this application, a miniature electrostatic induction probe is also installed on the outer wall of the sampling tube 3 to detect the charge generated on the surface of the sampling tube 3 and send the detection result to the sampling control box 9. The sampling control box 9 determines whether the charge generation rate is greater than the safety threshold to determine whether there is an explosion risk. If so, the movement speed of the sampling tube 3 is reduced to reduce the charge generation rate and thus improve sampling safety.

[0059] In one possible implementation, to reduce the risk of electrostatic discharge (ESD), the sampling cylinder 3, wire rope 4, roller 11, and roller box 10 are generally made of anti-static materials. When a charge is generated on the surface of the sampling cylinder 3, it will dissipate along the conductive path of the sampling cylinder 3, wire rope 4, roller 11, roller box 10, and grounding wire. However, although the anti-static material can dissipate the charge through conductivity, in automated sampling, if the sampling cylinder 3 moves back and forth continuously in a short period of time, although the charge generated by each movement can be partially dissipated by the anti-static material, the high frequency and short interval operation will cause the charge to not be completely dissipated and to accumulate, eventually forming a total amount of ESD far exceeding that of a single sampling, thus causing an explosion risk. Therefore, this application connects a high-frequency current sensor 8 in series at the grounding end of the roller box 10 to detect the current flowing to the grounding end for dissipation and sends the detection result to the sampling control box 9. The sampling control box 9 then converts this into a charge dissipation rate and compares it with the charge generation rate. If the charge generation rate is greater than the charge dissipation rate, the movement speed of the sampling cylinder 3 is reduced to reduce the charge generation rate, thereby improving sampling safety. Specifically:

[0060] This application provides an intelligent sampling control method for hazardous chemical storage tanks, which is applied in a sampling control box 9, such as... Figure 2 As shown, the method includes steps S101 to S105, which are as follows:

[0061] S101. Based on the electrical data collected by the miniature electrostatic induction probe and the high-frequency current sensor 8, determine the charge generation rate and charge dissipation rate on the surface of the sampling tube 3.

[0062] S102. Determine whether the charge generation rate is greater than the charge dissipation rate.

[0063] S103. If so, obtain the sampling depth of sampling cylinder 3.

[0064] In steps S101 to S103 above, the sampling control box 9 receives real-time electrical data transmitted by the miniature electrostatic induction probe and the high-frequency current sensor 8, and converts the electrical data into the charge generation rate and charge dissipation rate on the surface of the sampling tube 3. It should be noted that the conversion method is a conventional method for those skilled in the art, and will not be elaborated on here.

[0065] Then, the charge generation rate is compared with the charge dissipation rate. If the charge generation rate is less than or equal to the charge dissipation rate, the explosion risk is low, and the current sampling rate can be maintained. However, if the charge generation rate is greater than the charge dissipation rate, it indicates that the surface of sampling cylinder 3 is in the charge accumulation stage, and an explosion risk will arise when the charge accumulates significantly. Specifically:

[0066] The space inside storage tank 5 consists of two parts: a liquid phase space and a gas phase space. When sampling tube 3 is in the liquid phase space, its movement drags the liquid flow, forming a velocity gradient shear layer. The liquid molecules in the shear layer undergo dielectric separation due to friction, causing the surface of sampling tube 3 to adsorb charges. Since the hazardous chemical liquid itself also has a certain degree of conductivity, the sampling tube 3 and the hazardous chemical liquid form a structure similar to a capacitor. Sampling tube 3 and the hazardous chemical liquid are two conductive electrode plates. As more and more charges are adsorbed on the surface of sampling tube 3, the potential difference between sampling tube 3 and the hazardous chemical liquid becomes larger and larger, and the stored potential energy also becomes larger and larger. When the potential energy exceeds the breakdown threshold of the liquid hazardous chemical, an electric arc will be generated instantaneously, thereby triggering an explosion.

[0067] When sampling cylinder 3 moves in the gas phase space, its surface will frequently collide elastically with gas molecules. During the collision, the outer electrons of the molecules will be transferred due to energy transfer, causing the surface of sampling cylinder 3 to become charged. However, the gas molecules of hazardous chemicals are usually insulating media, and it is difficult for the charge to be conducted through the gas itself. But a potential difference will be formed between the surface of sampling cylinder 3 and the surrounding conductors. As more and more charge accumulates on the surface of sampling cylinder 3, the potential difference becomes larger and larger. When the potential difference exceeds the breakdown field strength of the gas, sparks will be generated instantly, and the violent movement of electrons will produce a discharge, thereby triggering an explosion.

[0068] Therefore, since the explosion initiation principle of the sampling cylinder 3 moving in the liquid phase space is different from that of its movement in the gas phase space, it is necessary to determine the movement space of the sampling cylinder 3 before analyzing and obtaining the sampling speed control strategy. Specifically: This application first determines the liquid level height in the storage tank 5 based on the data transmitted by the high-frequency radar level gauge, and then obtains the movement space of the sampling cylinder 3 based on the depth below the sampling cylinder 3.

[0069] S104. Based on the sampling depth and the liquid level in the storage tank 5, determine the target sampling speed of the sampling cylinder 3.

[0070] In the above steps, the process is described from the completion of sampling by sampling cylinder 3 to its retraction into the roller box 10. When the sampling depth of sampling cylinder 3 is below the liquid level in storage tank 5, sampling cylinder 3 moves in the liquid phase space. Shear stress exists between the surface of sampling cylinder 3 and the liquid hazardous chemical. This shear stress separates the charges of liquid molecules, causing the surface of sampling cylinder 3 to be charged, thus creating a potential difference between the surface of sampling cylinder 3 and the liquid hazardous chemical. The generation of this potential difference means the accumulation of potential energy. Since the shear stress between the surface of sampling cylinder 3 and the hazardous chemical liquid originates from the viscous resistance of the liquid hazardous chemical on the surface of sampling cylinder 3, the work done by the viscous resistance is partially converted into potential energy. The liquid hazardous chemical itself is conductive and can dissipate potential energy. Therefore, when the potential energy conversion rate per unit time is less than or equal to the potential energy dissipation rate, the potential energy between the surface of sampling cylinder 3 and the liquid hazardous chemical cannot accumulate, thereby greatly reducing the risk of explosion. Based on the above principle, this application first calculates the Reynolds number of the current sampling scenario, as follows:

[0071]

[0072] in, The density of the hazardous chemical liquid. This represents the current sampling speed of sampling cylinder 3. The sampling tube has a diameter of 3. The dynamic viscosity of hazardous chemicals.

[0073] The Reynolds number characterizes the flow state of a fluid. When the Reynolds number is less than 1, it is a laminar flow. When the Reynolds number is greater than or equal to 1 but less than 1000, it is a transitional state between laminar and turbulent flow. When the Reynolds number is greater than 1000, it is a turbulent flow.

[0074] When the Reynolds number is less than 1, the viscous drag can be calculated using Stokes' formula for the axial motion of a cylinder. Specifically, the calculation can be performed using the following formula:

[0075]

[0076] Where F is the viscous drag, L is the height of sampling tube 3, v is the current sampling velocity, and Re is the Reynolds number. is the Euler-Marschroni constant.

[0077] As the speed of the sampling tube 3 in the liquid increases, the viscous resistance experienced by the sampling tube 3 also increases.

[0078] When the Reynolds number is greater than or equal to 1, the viscous drag is calculated using a kinetic energy model based on the drag coefficient of the hazardous chemical. The specific calculation method is as follows:

[0079]

[0080] Where F is the viscous resistance, Let v be the density of the hazardous chemicals and v be the current sampling rate. The drag coefficient related to the viscosity of hazardous chemicals. The area of ​​the outer wall of sampling cylinder 3.

[0081] In the above formula, when the cylinder is in turbulent motion within a fluid, it is difficult to directly calculate the viscous drag of the fluid. However, the cylinder's motion compresses and disturbs the fluid, giving it kinetic energy. In this case, the kinetic energy density of the hazardous chemical liquid can be calculated as follows: To determine the kinetic energy per unit volume of the fluid, the outer wall area A of sampling cylinder 3 is multiplied by the velocity v to obtain the volume of the disturbed fluid per unit time. The kinetic energy density is then multiplied by the volume of the disturbed fluid per unit time to obtain the kinetic energy of the fluid per unit time. Since the fluid kinetic energy originates from viscous drag, therefore... The viscous resistance can be calculated. In the above formula, as the speed of the sampling tube 3 in the liquid increases, the viscous resistance received by the sampling tube 3 increases.

[0082] Then, based on the viscous drag and the energy conversion coefficient, the potential energy converted from the work done by the viscous drag is calculated as follows:

[0083]

[0084] Where E is the electric potential energy, F is the viscous drag, and h is the sampling depth. This is the energy conversion coefficient.

[0085] Finally, based on the safe energy threshold of the hazardous chemical liquid, when the potential energy is less than or equal to the safe energy threshold, the target sampling speed v is obtained. At the target sampling speed, the potential energy accumulated by the sampling tube 3 from the current sampling depth until it leaves the hazardous chemical liquid is insufficient to trigger an explosion, thereby reducing the risk of explosion. Here, the safe energy threshold can be understood as the upper limit of the potential energy dissipation of the liquid hazardous chemical.

[0086] When the sampling cylinder 3 is above the liquid level in the storage tank 5, the sampling cylinder 3 moves in the gas phase space. At this time, the charge on the surface of the sampling cylinder 3 is generated by the frequent elastic collisions of gas phase molecules. However, since the gas phase molecules of hazardous chemicals are usually insulating media, the dissipation path of the charge on the surface of the sampling cylinder 3 is relatively simple. It is basically dissipated along the sampling cylinder 3, the wire rope 4, the roller 11, the roller box 10, and the grounding wire. At this time, the first sampling speed adjustment coefficient can be obtained directly according to the ratio of the charge dissipation rate to the charge generation rate. Then, the first sampling speed adjustment coefficient is multiplied by the current sampling speed to obtain the target sampling speed of the sampling cylinder 3.

[0087] In one possible implementation, when the sampling tube 3 just leaves the liquid hazardous chemical, a layer of hazardous chemical liquid film will adhere to the surface of the sampling tube 3 and the steel wire rope 4 due to the viscosity of the hazardous chemical. Since the hazardous chemical liquid film has a certain degree of conductivity, it increases the charge conduction area from the sampling tube 3 to the steel wire rope 4, thereby making the charge dissipation rate faster. However, as the hazardous chemical liquid film evaporates, the charge conduction area changes abruptly at the moment of drying. Since the sampling tube 3 is still moving at high speed, the charge dissipation rate will suddenly drop, causing the charge accumulation to reach a critical value in a very short time, causing an explosion risk. Therefore, to prevent this situation from occurring in advance, this application, based on the characteristic that the charge dissipation rate of sampling cylinder 3 changes abruptly immediately after leaving the liquid hazardous chemical, compares the charge dissipation rate with a preset threshold. When the charge dissipation rate is greater than or equal to the preset threshold, it can be determined that sampling cylinder 3 is in a state where it has just left the liquid hazardous chemical. At this time, according to the preset hazardous chemical-sampling speed-liquid film residual thickness data table, the liquid film residual thickness corresponding to the current sampling speed is retrieved. This hazardous chemical-sampling speed-liquid film residual thickness data table is obtained by those skilled in the art through experimental calibration in a laboratory. Then, the gas phase concentration and temperature inside storage tank 5 are obtained to determine the liquid film evaporation rate. It can be understood that the higher the gas phase concentration, the slower the liquid film evaporation; and the higher the temperature, the faster the liquid film evaporation. Therefore...

[0088]

[0089] in, This represents the liquid film evaporation rate. This represents the liquid film evaporation rate under standard conditions. Given the current gas phase concentration, The current temperature, This represents the gas phase concentration under standard conditions. The gas phase temperature under standard conditions. The concentration-evaporation coefficient is... The coefficient of temperature versus evaporation.

[0090] Then, based on the residual liquid film thickness and the liquid film evaporation rate, the residual liquid film coefficient is determined as follows:

[0091]

[0092] in, Let be the liquid film residue coefficient at time t, and r be the liquid film evaporation rate. The initial residual thickness of the liquid film is denoted as t, and the evaporation time is t.

[0093] In the above formula, the liquid film residue coefficient is not a fixed value, but a dynamic coefficient that changes with time; it corresponds to the scenario where the liquid film residue thickness becomes thinner and thinner as the evaporation time increases.

[0094] Then, the liquid film residual coefficient is multiplied by the charge dissipation rate to obtain the dynamically changing risk charge dissipation rate. Finally, based on the ratio of the risk charge dissipation rate to the charge generation rate, the dynamically changing second sampling speed adjustment coefficient is obtained. Then, the second sampling speed adjustment coefficient is multiplied by the current sampling speed of sampling cylinder 3 to obtain the target sampling speed. At this time, the target sampling speed changes with the change of the liquid film residual thickness. When the liquid film residual thickness completely disappears, the sampling speed can adapt to the charge dissipation rate throughout the process, reducing the risk of explosion and avoiding the risk of charge accumulation and runaway caused by sudden changes in sampling speed.

[0095] S105. Adjust the power of the drive motor 7 according to the target sampling speed.

[0096] In the above steps, based on the target sampling speed obtained from the analysis, the power of the drive motor 7 is controlled so that it controls the movement speed of the sampling tube 3 to the target sampling speed, thereby reducing the charge generation rate so that the charge generation rate is less than or equal to the charge dissipation rate, thereby reducing the risk of explosion caused by charge accumulation on the surface of the sampling tube 3.

[0097] Reference Figure 3 This application also provides an intelligent sampling control device for hazardous chemical storage tanks. The device is a sampling control box 9, which includes an acquisition module 91, a processing module 92, and a control module 93, wherein:

[0098] The acquisition module 91 is used to determine the charge generation rate and charge dissipation rate on the surface of the sampling tube 3 based on the electrical data collected by the miniature electrostatic induction probe and the high-frequency current sensor 8.

[0099] Processing module 92 is used to determine whether the charge generation rate is greater than the charge dissipation rate; if so, it obtains the sampling depth of sampling cylinder 3; based on the sampling depth and the liquid level height of storage tank 5, it determines the target sampling speed of sampling cylinder 3.

[0100] The control module 93 is used to adjust the power of the drive motor 7 according to the target sampling speed.

[0101] It should be noted that the above embodiments of the apparatus are only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the apparatus and method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process can be found in the method embodiments, which will not be repeated here.

[0102] This application also discloses an electronic device. (See reference...) Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application. The electronic device 400 may include: at least one processor 401, at least one network interface 404, a user interface 403, a memory 405, and at least one communication bus 402.

[0103] The communication bus 402 is used to enable communication between these components.

[0104] The user interface 403 may include a display screen and a camera. Optionally, the user interface 403 may also include a standard wired interface and a wireless interface.

[0105] The network interface 404 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface).

[0106] The processor 401 may include one or more processing cores. The processor 401 connects to various parts of the server using various interfaces and lines, and performs various server functions and processes data by running or executing instructions, programs, code sets, or instruction sets stored in memory 405, and by calling data stored in memory 405. Optionally, the processor 401 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 401 may integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the content required for display; and the modem handles wireless communication. It is understood that the modem may also be implemented as a separate chip without being integrated into the processor 401.

[0107] The memory 405 may include random access memory (RAM) or read-only memory. Optionally, the memory 405 may include a non-transitory computer-readable storage medium. The memory 405 may be used to store instructions, programs, code, code sets, or instruction sets. The memory 405 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as touch function, sound playback function, image playback function, etc.), instructions for implementing the above-described method embodiments, etc.; the data storage area may store data involved in the above-described method embodiments, etc. Optionally, the memory 405 may also be at least one storage device located remotely from the aforementioned processor 401. (Refer to...) Figure 4 The memory 405, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and an application program for an intelligent sampling method for hazardous chemical storage tanks.

[0108] exist Figure 4In the illustrated electronic device 400, the user interface 403 is mainly used to provide an input interface for the user and acquire user input data; while the processor 401 can be used to call an application program stored in the memory 405 for a smart sampling method for hazardous chemical storage tanks. When executed by one or more processors 401, the electronic device 400 performs one or more of the methods described in the above embodiments. It should be noted that, for the foregoing method embodiments, for the sake of simplicity, they are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, because according to this application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0109] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0110] In the various embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some service interface; the indirect coupling or communication connection between apparatuses or units may be electrical or other forms.

[0111] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0112] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0113] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned memory includes various media capable of storing program code, such as USB flash drives, portable hard drives, magnetic disks, or optical disks.

[0114] The above description is merely an exemplary embodiment of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Other embodiments of this disclosure will be readily apparent to those skilled in the art upon consideration of the specification and the disclosure of practical truths.

[0115] This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described in this disclosure. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.

Claims

1. A method for intelligent sampling and control of hazardous chemical storage tanks, characterized in that, The sampling control box (9) is used in a sampling control box (9) of a smart sampling system for hazardous chemical storage tanks. The smart sampling system for hazardous chemical storage tanks includes a storage tank (5), a sampling cylinder (3), a wire rope (4), a roller box (10), a drive motor (7), and a sampling control box (9). The roller box (10) is equipped with a roller (11), wherein: Both the storage tank (5) and the roller box are equipped with sampling ports and are connected by flanges (6). The sampling cylinder (3) is connected to one end of the wire rope (4), and the other end of the wire rope (4) is wound around the roller (11). The drive shaft of the drive motor (7) is axially fixedly connected to the roller (11). The sampling control box (9) is electrically connected to the drive motor (7) and is used to control the sampling speed. The storage tank (5) is also equipped with a high-frequency radar level gauge for detecting the liquid level inside the storage tank (5). The outer wall of the sampling tube (3) is also provided with a counterweight (1) to make the sampling tube (3) sink to a specified depth. The outer wall of the sampling tube (3) is also equipped with a miniature electrostatic induction probe (2). A high-frequency current sensor (8) is connected in series at the grounding terminal of the roller box (10) to detect the current flowing to the grounding terminal. The method includes: Based on the electrical data collected by the miniature electrostatic induction probe (2) and the high-frequency current sensor (8), the charge generation rate and charge dissipation rate on the surface of the sampling tube (3) are determined. Determine whether the charge generation rate is greater than the charge dissipation rate; If so, then obtain the sampling depth of the sampling tube (3); Based on the sampling depth and the liquid level in the storage tank (5), the target sampling speed of the sampling cylinder (3) is determined, specifically as follows: If the sampling depth is below the liquid level in the storage tank (5), the flow state of the liquid hazardous chemical is determined according to the current sampling speed of the sampling tube (3); Calculate the viscous resistance of the liquid hazardous chemical to the sampling cylinder (3) based on the flow state of the liquid hazardous chemical; The cumulative potential energy is calculated based on the viscous resistance and sampling depth. Based on the safety energy threshold of hazardous chemical liquids, the target sampling speed of the sampling tube (3) is calculated; The power of the drive motor (7) is adjusted according to the target sampling speed.

2. The method according to claim 1, characterized in that, The determination of the target sampling rate of the sampling cylinder (3) based on the sampling depth further includes: If the sampling depth is above the liquid level in the storage tank (5), then determine whether the charge dissipation rate is greater than or equal to a preset threshold. If not, then the first sampling rate adjustment coefficient is obtained based on the ratio of the charge dissipation rate to the charge generation rate; Based on the first sampling speed adjustment coefficient, the current sampling speed is adjusted to obtain the target sampling speed of the sampling cylinder (3).

3. The method according to claim 2, characterized in that, The step of determining whether the charge generation rate is greater than or equal to a preset threshold specifically includes: If the charge dissipation rate is greater than or equal to a preset threshold, the residual thickness of the liquid film on the sampling tube (3) is calculated based on the current sampling rate. Obtain the gas phase concentration and temperature inside the storage tank (5); The liquid film evaporation rate is determined based on the gas phase concentration and the temperature. The liquid film residue coefficient is determined based on the liquid film residue thickness and the liquid film evaporation rate. The charge dissipation rate is adjusted based on the liquid film residual coefficient to obtain the risk charge dissipation rate; The second sampling rate adjustment coefficient is obtained based on the ratio of the risk charge dissipation rate to the charge generation rate. Based on the second sampling speed adjustment coefficient, the current sampling speed is adjusted to obtain the target sampling speed of the sampling cylinder (3).

4. An intelligent sampling and control device for hazardous chemical storage tanks, characterized in that, The device is a sampling control box (9), which includes an acquisition module (91), a processing module (92), and a control module (93). The sampling control box (9) is used to execute the intelligent sampling control method for hazardous chemical storage tanks as described in any one of claims 1-3, wherein: The acquisition module (91) is used to determine the charge generation rate and charge dissipation rate on the surface of the sampling tube (3) based on the electrical data collected by the micro electrostatic induction probe (2) and the high-frequency current sensor (8). The processing module (92) is used to determine whether the charge generation rate is greater than the charge dissipation rate; if so, the sampling depth of the sampling tube (3) is obtained; based on the sampling depth and the liquid level height of the storage tank (5), the target sampling speed of the sampling tube (3) is determined. The control module (93) is used to adjust the power of the drive motor (7) according to the target sampling speed.

5. An electronic device, characterized in that, The device includes a processor (401), a memory (405), a user interface (403), and a network interface (404). The memory (405) is used to store instructions. The user interface (403) and the network interface (404) are used to communicate with other devices. The processor (401) is used to execute the instructions stored in the memory (405) to cause the electronic device (400) to perform the method as described in any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed, perform the method as described in any one of claims 1 to 3.

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