Intelligent sampling system for hazardous chemical substance storage tank and control method

Abstract

The invention discloses an intelligent sampling system for a hazardous chemical substance storage tank and a control method, and relates to the field of sampling control. The system comprises a storage tank, a sampling cylinder, a steel wire rope, a winding roller box, a driving motor and a sampling control box, a winding roller is arranged in the winding roller box, and the storage tank and the winding roller box are both provided with sampling openings and are connected through flanges; the sampling cylinder is connected with one end of the steel wire rope; the other end of the steel wire rope is wound on the winding roller; a driving shaft of the driving motor is axially and fixedly connected with the winding roller; the sampling control box is electrically connected with the driving motor and used for controlling the sampling speed; the storage tank is further provided with a high-frequency radar liquid level meter used for detecting the height of the liquid level in the storage tank. A balancing weight is also arranged on the outer wall of the sampling cylinder and is used for enabling the sampling cylinder to sink to a specified depth. By implementing the technical scheme provided by the invention, the problems that the inlet of the telescopic pipe is easy to block and the residual medium in the pipe is difficult to thoroughly clean when the sampling structure of the conventional telescopic sampling pipe is used for high-viscosity hazardous chemicals containing particle impurities are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sampling control, and in particular to an intelligent sampling system for a dangerous chemical storage tank and a control method. BACKGROUND

[0002] During long-term storage of liquid dangerous chemicals, the properties of the liquid dangerous chemicals may change due to factors such as temperature change, pressure fluctuation, and medium volatilization, thereby causing the quality of the liquid dangerous chemicals to decrease. Therefore, periodic sampling and detection are needed to ensure the quality stability of the final product.

[0003] Most of the current sampling methods are to open a sampling hole on the storage tank, and then install a sampling pipeline and a valve on the sampling hole. When sampling is needed, the valve is opened, and the liquid dangerous chemicals flow into a collection bottle through the pipeline. This method is simple, but it cannot meet the sampling needs at different depths of the storage tank. Therefore, a sampling structure using a telescopic sampling tube is proposed in the prior art. The sampling tube is installed in a sealed tank body storing liquid dangerous chemicals, and can be lifted by a traction mechanism. One end of the tube is provided as a sampling port, and the other end of the tube extends out of the tank body to connect a sampling device. By controlling the traction mechanism, the height of the sampling telescopic tube in the tank body is adjusted, thereby achieving sampling at different depths.

[0004] However, when the above-mentioned sampling structure using a telescopic sampling tube is used to sample dangerous chemicals with high viscosity and particulate impurities, the inlet of the telescopic tube is easily blocked, thereby making it difficult to effectively sample. In addition, after sampling, the residual medium in the tube is difficult to clean thoroughly, thereby causing contamination of the subsequent sampling samples. SUMMARY

[0005] In view of the problem that the sampling structure using a telescopic sampling tube is easily blocked at the inlet of the telescopic tube and the residual medium in the tube is difficult to clean thoroughly when the telescopic sampling tube is used to sample dangerous chemicals with high viscosity and particulate impurities, the present application provides an intelligent sampling system for a dangerous chemical storage tank and a control method.

[0006] In a first aspect, the present application provides an intelligent sampling system for a dangerous chemical storage tank, comprising 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 provided with a winding roller.

[0007] The storage tank and the winding roller box are both provided with a sampling port, and are connected by a flange;

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

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

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

[0011] The storage tank is also provided with a high-frequency radar liquid level meter for detecting the liquid level height in the storage tank.

[0012] The outer wall of the sampling cylinder is also provided with a counterweight for sinking the sampling cylinder to a specified depth.

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

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

[0015] In a second aspect, the present application provides an intelligent sampling control method for a dangerous chemical storage tank, which is applied to the sampling control box of any one of the first aspect, and the method comprises:

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

[0017] It is determined whether the electric charge generation rate is greater than the electric charge dissipation rate.

[0018] If yes, the sampling depth of the sampling cylinder is obtained.

[0019] Based on the sampling depth and the liquid level height of the storage tank, the target sampling speed of the sampling cylinder is determined.

[0020] According to the target sampling speed, the power of the driving motor is adjusted.

[0021] Optionally, the target sampling speed of the sampling cylinder is determined based on the sampling depth, and specifically:

[0022] If the sampling depth is below the liquid level height of the storage tank, the flow state of the liquid dangerous chemical is determined according to the current sampling speed of the sampling cylinder.

[0023] According to the flow state of the liquid dangerous chemical, the viscous drag of the liquid dangerous chemical on the sampling cylinder is calculated.

[0024] According to the viscous drag and the sampling depth, the cumulative potential energy is calculated.

[0025] Based on the safety energy threshold of the dangerous chemical liquid, the target sampling speed of the sampling cylinder is calculated.

[0026] Optionally, the target sampling speed of the sampling cylinder is determined based on the sampling depth, and specifically further comprising:

[0027] If the sampling depth is above the liquid level of the storage tank, it is determined whether the charge dissipation rate is greater than or equal to a preset threshold value;

[0028] If not, a first sampling speed adjustment coefficient is obtained according to a ratio of the charge dissipation rate to the charge generation rate;

[0029] The current sampling speed is adjusted based on the first sampling speed adjustment coefficient to obtain a target sampling speed of the sampling cylinder.

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

[0031] If the charge dissipation rate is greater than or equal to a preset threshold value, a residual liquid film thickness on the sampling cylinder is calculated according to the current sampling speed;

[0032] The gas phase concentration and temperature in the storage tank are obtained;

[0033] The liquid film evaporation rate is determined according to the gas phase concentration and the temperature;

[0034] A residual liquid film coefficient is determined according to the residual liquid film thickness and the liquid film evaporation rate;

[0035] The risk charge dissipation rate is obtained by adjusting the charge dissipation rate according to the residual liquid film coefficient;

[0036] A second sampling speed adjustment coefficient is obtained according to a ratio of the risk charge dissipation rate to the charge generation rate;

[0037] The current sampling speed is adjusted based on the second sampling speed adjustment coefficient to obtain a target sampling speed of the sampling cylinder.

[0038] In a third aspect, the present application provides an intelligent sampling control device for a hazardous chemical storage tank. The device is a sampling control box, which includes an acquisition module, a processing module, and a control module. Specifically,

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

[0040] The processing module is configured to determine whether the charge generation rate is greater than the charge dissipation rate. If yes, the sampling depth of the sampling cylinder is obtained. Based on the sampling depth and the liquid level of the storage tank, the target sampling speed of the sampling cylinder is determined.

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

[0042] In a third aspect, the present application provides an electronic device, comprising a processor, a memory, a user interface and a network interface, the memory is configured to store instructions, the user interface and the network interface are configured to communicate with other devices, and the processor is configured to execute the instructions stored in the memory to enable the electronic device to perform the method according to any one of the second aspect.

[0043] In a fourth aspect, the present application provides a computer-readable storage medium, which stores instructions, when the instructions are executed, the method according to any one of the second aspect is performed.

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

[0045] 1. The intelligent sampling system for hazardous chemical storage tank provided in the present application is characterized in that a sampling port flange is arranged on the top of the storage tank, and a winding roller box is connected to the sampling port flange, a winding roller is arranged in the winding roller box, the winding roller is driven to rotate by a driving motor, a steel wire rope is wound on the winding roller, one end of the steel wire rope is connected to a sampling cylinder, and a counterweight is arranged on the sampling cylinder. When sampling is needed, the driving motor drives the winding roller to rotate, the rotating winding roller releases the steel wire rope, the sampling cylinder reaches a specified depth under the action of gravity to perform sampling, after sampling is completed, the driving motor controls the winding roller to retract the steel wire rope, the sampling cylinder is retracted into the winding roller box under the action of tension, and then a worker can take away the sampling cylinder. In the whole process, the counterweight enables the sampling cylinder to be lowered to the specified depth in the hazardous chemical with high viscosity, in addition, the sampling cylinder structure used in the present application does not need to use the telescopic sampling pipe to perform suction sampling, and the sampling cylinder structure is convenient to operate and easy to clean, thereby effectively solving the sampling problem faced by the sampling structure of the telescopic sampling pipe.

[0046] 2、The intelligent sampling system for dangerous chemical storage tank provided by the application can monitor the charge generation rate and the charge dissipation rate of the sampling cylinder in real time. Once the charge generation rate is greater than the charge dissipation rate, it indicates that there is a risk of electrification. At this time, the sampling speed adjustment mechanism is triggered. Specifically, according to the current sampling depth of the sampling cylinder and the liquid level height of the storage tank, the motion environment in which the sampling cylinder is located is determined. Then, according to the electrostatic production / dissipation mechanism of different motion environments, the corresponding sampling speed is determined. Finally, according to the sampling speed, the power of the driving motor is adjusted, so 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. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a structural schematic diagram of an intelligent sampling system for dangerous chemical storage tank provided by an embodiment of the application.

[0048] Figure 2 is a flowchart of an intelligent sampling control method for dangerous chemical storage tank provided by an embodiment of the application.

[0049] Figure 3 is a structural schematic diagram of an intelligent sampling control device for dangerous chemical storage tank provided by an embodiment of the application.

[0050] Figure 4 is a structural schematic diagram of an electronic device provided by an embodiment of the application.

[0051] Mark explanation: 1, counterweight; 2, miniature electrostatic induction probe; 3, sampling cylinder; 4, steel wire rope; 5, storage tank; 6, flange; 7, driving motor; 8, high-frequency current sensor; 9, sampling control box; 91, acquisition module; 92, processing module; 93, control module; 10, winding roller box; 11, winding roller; 400, electronic device; 401, processor; 402, communication bus; 403, user interface; 404, network interface; 405, memory. DETAILED DESCRIPTION

[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 intelligent sampling system is as follows: when sampling is needed, the user selects a sampling mode on the sampling control box 9, the sampling mode including an automatic mode and a manual mode; when the user selects the manual mode, the user first selects a sampling speed, and then controls the upward and downward movement of the sampling cylinder 3 through the upward button or the downward button; when the user selects the automatic mode, the user needs to select a sampling depth, and then the sampling control box 9 configures a sampling speed according to the sampling depth, and then controls the power of the driving motor 7 according to the sampling speed; after the driving motor 7 is started, the driving shaft rotates to drive the winding roller 11 to rotate, and the winding roller 11 rotates to drive the steel wire rope 4 to release; under the action of gravity, the sampling cylinder 3 reaches the sampling depth selected by the user; after the sampling cylinder 3 completes sampling of the hazardous chemical sample at the sampling depth, the driving motor 7 drives the winding roller 11 to rotate in the reverse direction to collect the steel wire rope 4; under the action of the pulling force of the steel wire rope 4, the sampling cylinder 3 moves upward until it reaches the winding roller box 10; at this time, the user can open the winding roller box 10 to take away the hazardous chemical sample to complete sampling.

[0058] During the upward and downward movement of the sampling cylinder 3 in the storage tank 5, the molecules of the hazardous chemical liquid with high viscosity and the gas molecules will all transfer charges due to relative movement with the outer wall of the sampling cylinder 3, thereby generating static electricity, which greatly increases the explosion risk for some hazardous chemicals with unstable properties; therefore, a miniature static electricity sensing probe is further installed on the outer wall of the sampling cylinder 3 in the present application, which is used to detect the electric charge generated on the surface of the sampling cylinder 3 and send the detection result to the sampling control box 9; the sampling control box 9 judges whether the charge generation rate is greater than a safety threshold value to determine whether an explosion risk will occur; if so, the movement speed of the sampling cylinder 3 is reduced to reduce the charge generation rate, thereby improving the sampling safety.

[0059] In a possible implementation, in order to reduce the risk of static electricity, the sampling cylinder 3, the steel wire rope 4, the winding roller 11, and the winding roller box 10 are generally made of an anti-static material; when the electric charge is generated on the surface of the sampling cylinder 3, the electric charge will be dissipated along the conductive path of the sampling cylinder 3, the steel wire rope 4, the winding roller 11, the winding roller box 10, and the grounding wire. However, although the anti-static material can dissipate the electric charge through conduction, in automatic sampling, if the sampling cylinder 3 continuously moves back and forth in a short time, the electric charge generated each time can be partially dissipated through the anti-static material, but the high-frequency and short-interval operation will cause the electric charge to be superimposed without being completely dissipated, and finally form a total amount of static electricity far exceeding that of single sampling, thereby causing an explosion risk. Therefore, the high-frequency current sensor 8 is connected in series at the grounding end of the winding roller box 10 in the present application, which is used to detect the current flowing to the grounding end for dissipation and send the detection result to the sampling control box 9; the sampling control box 9 converts the detection result 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 the sampling safety; specifically:

[0060] The application provides a dangerous chemical storage tank intelligent sampling control method, which is applied to a sampling control box 9, as shown in the figure, and comprises steps S101-S105. Figure 2

[0061] S101, determine the charge generation rate and charge dissipation rate of the surface of the sampling cylinder 3 according to the electric data collected by the micro electrostatic induction probe and the high-frequency current sensor 8.

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

[0063] S103, if yes, obtain the sampling depth of the sampling cylinder 3.

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

[0065] Then compare the charge generation rate and the charge dissipation rate. If the charge generation rate is less than or equal to the charge dissipation rate, the explosion risk is low at this time, and the current sampling speed can be maintained; but if the charge generation rate is greater than the charge dissipation rate, it means that the surface of the sampling cylinder 3 is in the charge accumulation stage, and when the charge accumulates more, it will cause an explosion risk. Specifically:

[0066] The space composition in the storage tank 5 includes two parts, namely the liquid phase space and the gas phase space. When the sampling cylinder 3 is in the liquid phase space, its movement will drag the liquid flow to form a velocity gradient shear layer, and the liquid molecules in the shear layer will be separated due to friction, resulting in the adsorption of charges on the surface of the sampling cylinder 3. Since the dangerous chemical liquid itself also has a certain conductivity, the sampling cylinder 3-dangerous chemical liquid forms a structure similar to a capacitor. The sampling cylinder 3 and the dangerous chemical liquid are two conductive plates. When the sampling cylinder 3 surface adsorbs more and more charges, the potential difference between the sampling cylinder 3 and the dangerous 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 dangerous chemical, an electric arc will be generated instantly, thereby causing an explosion.

[0067] ​When the sampling cylinder 3 is in motion in the gas phase space, the surface will frequently elastically collide with the gas molecules, and during the collision process, the outer electrons of the molecules will be transferred due to energy transfer, causing the surface of the sampling cylinder 3 to be charged. However, the gas molecules of the hazardous chemical are usually insulating media, and the charge is difficult to conduct in the gas itself, but a potential difference will be formed between the surface of the sampling cylinder 3 and the surrounding conductor. As the charge accumulated on the surface of the sampling cylinder 3 increases, the potential difference becomes larger and larger. When the potential difference breaks through the breakdown field strength of the gas, a spark will be formed instantaneously, and the electrons will move violently to produce discharge, thereby causing an explosion.

[0068] Therefore, since the explosion initiation principles of the sampling cylinder 3 in the liquid phase space and in the gas phase space are different, before the sampling speed control strategy is analyzed, it is necessary to determine the motion space of the sampling cylinder 3. Specifically, the application first determines the liquid level in the storage tank 5 according to the data transmitted by the high-frequency radar liquid level meter, and then determines the motion space of the sampling cylinder 3 according to the depth below the sampling cylinder 3.

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

[0070] In the above steps, from the start of sampling by the sampling cylinder 3 to the collection of the sampling cylinder 3 to the winding roller box 10, when the sampling depth of the sampling cylinder 3 is below the liquid level of the storage tank 5, the sampling cylinder 3 is in motion in the liquid phase space, and there will be a shear stress between the surface of the sampling cylinder 3 and the liquid hazardous chemical. The shear stress will separate the charge of the liquid molecules, so that the surface of the sampling cylinder 3 will carry a charge, thereby forming a potential difference between the surface of the sampling cylinder 3 and the liquid hazardous chemical. The generation of the potential difference means the accumulation of potential energy. Since the shear stress between the surface of the sampling cylinder 3 and the liquid hazardous chemical is derived from the viscous drag of the liquid hazardous chemical on the surface of the sampling cylinder 3, the work done by the viscous drag will be partially converted into potential energy. The liquid hazardous chemical itself has conductivity and can dissipate potential energy. Therefore, when the conversion rate of potential energy per unit time is less than or equal to the dissipation rate of potential energy, the potential energy between the surface of the sampling cylinder 3 and the liquid hazardous chemical cannot be accumulated, thereby greatly reducing the risk of explosion. Based on the above principle, the Reynolds number of the current sampling scene is first calculated as follows:

[0071]

[0072] wherein, is the density of the hazardous chemical liquid, is the current sampling speed of the sampling cylinder 3, is the diameter of the sampling cylinder 3, is the dynamic viscosity of the hazardous chemical.

[0073] The Reynolds number represents the flow state of the fluid. When the Reynolds number is less than 1, it belongs to the laminar flow state. When the Reynolds number is greater than or equal to 1 and less than 1000, it belongs to the transition state of laminar flow and turbulent flow. When the Reynolds number is greater than 1000, it belongs to the turbulent flow state.

[0074] When the Reynolds number is less than 1, the viscous drag force can be calculated according to the Stokes formula in the scenario of the axial movement of the cylinder. Specifically, the following formula can be used for calculation:

[0075]

[0076] Wherein, F is the viscous drag force, L is the height of the sampling cylinder 3, v is the current sampling speed, Re is the Reynolds number, is the Euler-Mascheroni constant.

[0077] As the sampling cylinder 3 moves faster in the liquid, the viscous drag force received by the sampling cylinder 3 is greater.

[0078] When the Reynolds number is greater than or equal to 1, the viscous drag force can be calculated according to the drag coefficient of the hazardous chemical. Specifically, the following formula can be used for calculation:

[0079]

[0080] Wherein, F is the viscous drag force, is the density of the hazardous chemical, v is the current sampling speed, is the drag coefficient related to the viscosity of the hazardous chemical, is the outer wall area of the sampling cylinder 3.

[0081] In the above formula, when the cylinder is in turbulent motion in the fluid, it is difficult to directly calculate the viscous drag force of the fluid. However, the movement of the cylinder will squeeze and disturb the fluid, so that the fluid obtains kinetic energy. At this time, the kinetic energy density of the hazardous chemical liquid can be determined by calculating the kinetic energy density of the fluid per unit volume , and then the outer wall area A of the sampling cylinder 3 is multiplied by the speed v to obtain the volume of the disturbed fluid per unit time. Then, the kinetic energy density is multiplied by the volume of the disturbed fluid per unit time to obtain the kinetic energy of the fluid per unit time. Since the kinetic energy of the fluid comes from the viscous drag force, the viscous drag force can be calculated according to In the above formula, as the sampling cylinder 3 moves faster in the liquid, the viscous drag force received by the sampling cylinder 3 is greater.

[0082] Then, the potential energy converted by the viscous drag force can be calculated according to the viscous drag force and the energy conversion coefficient, which is specifically as follows:

[0083]

[0084] Wherein, E is electric potential energy, F is hysteresis resistance, h is sampling depth, is energy conversion coefficient.

[0085] Finally, according to the safety energy threshold of the hazardous liquid, when the electric potential energy is less than or equal to the safety energy threshold, the target sampling speed v is solved, and under the target sampling speed, the sampling cylinder 3 moves from the current sampling depth to the position where the accumulated electric potential energy is not enough to cause explosion, thereby reducing the risk of explosion, wherein the safety energy threshold can be understood as the upper limit of the dissipation of the electric potential energy of the liquid hazardous chemical.

[0086] When the sampling cylinder 3 is located above the liquid level of 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 frequent elastic collision of gas molecules, but because the gas molecules of the hazardous chemical are usually insulating medium, the dissipation path of the charge on the surface of the sampling cylinder 3 is relatively single, which is basically along the sampling cylinder 3, the steel wire rope 4, the winding roller 11, the winding roller box 10 and the grounding wire to dissipate, at this time the first sampling speed adjustment coefficient can be directly obtained according to the ratio of the charge dissipation rate to the charge generation rate, and then the first sampling speed adjustment coefficient is multiplied by the current sampling speed, so as to obtain the target sampling speed of the sampling cylinder 3.

[0087] In a possible implementation, when the sampling cylinder 3 just leaves the liquid hazardous chemical, a layer of liquid film of the hazardous chemical is attached to the surface of the sampling cylinder 3 and the surface of the steel wire rope 4 due to the viscosity of the hazardous chemical, and the electric charge conduction area from the sampling cylinder 3 to the steel wire rope 4 is increased due to the certain conductivity of the liquid film of the hazardous chemical, so that the charge dissipation speed is relatively fast, but with the evaporation of the liquid film of the hazardous chemical, the electric charge conduction area suddenly changes at the moment of drying, and since the sampling cylinder 3 is still moving at a high speed, the charge dissipation rate suddenly drops, so that the charge accumulates to a critical value in a very short time, causing the risk of explosion. Therefore, in order to prevent this situation from happening in advance, according to the characteristics that the charge dissipation rate will suddenly change when the sampling cylinder 3 just leaves the liquid hazardous chemical, the charge dissipation rate is compared with a preset threshold, and when the charge dissipation rate is greater than or equal to the preset threshold, it can be determined that the sampling cylinder 3 is in the state of just leaving the liquid hazardous chemical; at this time, the liquid film residual thickness corresponding to the current sampling speed is queried from the preset hazardous chemical-sampling speed-liquid film residual thickness data table, wherein the hazardous chemical-sampling speed-liquid film residual thickness data table is obtained by calibrating experiments in the laboratory by those skilled in the art; then the gas phase concentration and temperature in the storage tank 5 are obtained to determine the evaporation rate of the liquid film, and it can be understood that the higher the gas phase concentration, the slower the evaporation of the liquid film, and the higher the temperature, the faster the evaporation of the liquid film, therefore,

[0088]

[0089] Wherein, is the liquid film evaporation rate, is the liquid film evaporation rate under standard state, is the current gas phase concentration, is the current temperature, is the gas phase concentration under standard state, is the gas phase temperature under standard state, is the concentration-evaporation coefficient, is the temperature-evaporation coefficient.

[0090] Then, according to the liquid film residual thickness and the liquid film evaporation rate, the liquid film residual coefficient is determined, specifically as follows:

[0091]

[0092] wherein, is the liquid film residual coefficient at the t time, and r is the liquid film evaporation rate, is the initial state of the liquid film residual thickness, and t is the evaporation time.

[0093] In the above formula, the liquid film residual coefficient is not a fixed value, but a dynamic coefficient that changes with time; it corresponds to the scenario that the liquid film residual 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 a dynamically changing risk charge dissipation rate, and finally according to the ratio of the risk charge dissipation rate to the charge generation rate, a dynamically changing second sampling speed adjustment coefficient is obtained; Then multiply the second sampling speed adjustment coefficient by the current sampling speed of the 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, and directly disappears when the liquid film residual thickness completely disappears. In the whole process, the sampling speed can adapt to the charge dissipation rate, reduce the explosion risk, and also avoid the risk of out-of-control charge accumulation caused by sudden change of sampling speed.

[0095] S105, according to the target sampling speed, adjust the power of the driving motor 7.

[0096] In the above steps, according to the target sampling speed obtained by analysis, the power of the driving motor 7 is controlled to control the movement speed of the sampling cylinder 3 to the target sampling speed, so as to reduce the charge generation rate, so that the charge generation rate is less than or equal to the charge dissipation rate, thereby reducing the explosion risk caused by charge accumulation on the surface of the sampling cylinder 3.

[0097] Referring to Figure 3 , the application also provides an intelligent sampling control device for a hazardous chemical storage tank. The device is a sampling control box 9, which comprises an acquisition module 91, a processing module 92 and a control module 93, wherein:

[0098] The acquisition module 91 is configured to determine the charge generation rate and the charge dissipation rate of the surface of the sampling cylinder 3 according to the electric data collected by the micro electrostatic induction probe and the high-frequency current sensor 8.

[0099] The processing module 92 is configured to determine whether the charge generation rate is greater than the charge dissipation rate, and if yes, to obtain the sampling depth of the sampling cylinder 3, and determine the target sampling speed of the sampling cylinder 3 based on the sampling depth and the liquid level of the storage tank 5.

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

[0101] It should be noted that the device provided in the above embodiment is only used as an example to divide the above functional modules to achieve its functions. In actual applications, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the above described functions. In addition, the device and method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process is described in the method embodiments, which will not be repeated here.

[0102] The present application also discloses an electronic device. Referring to Figure 4 , Figure 4 is a structural schematic diagram of an electronic device disclosed by the embodiment of the present application. The electronic device 400 can 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 realize the connection and communication between the components.

[0104] The user interface 403 can include a display screen (Display) and a camera (Camera). Optionally, the user interface 403 can further include a standard wired interface and a wireless interface.

[0105] The network interface 404 can optionally include a standard wired interface and a wireless interface (such as a WI-FI interface).

[0106] The processor 401 can include one or more processing cores. The processor 401 connects various parts within the server through various interfaces and lines, performs various functions of the server and processes data by running or executing instructions, programs, code sets or instruction sets stored in the memory 405, and calling data stored in the memory 405. Alternatively, the processor 401 can be implemented in at least one of a hardware form of a digital signal processing (DSP), a field-programmable gate array (FPGA), and a programmable logic array (PLA). The processor 401 can integrate a combination of one or more of a central processing unit (CPU), a graphics processing unit (GPU), and a modem. Among them, the CPU mainly processes operating systems, user interfaces, and application programs; the GPU is responsible for rendering and drawing the content to be displayed on the display screen; and the modem is used for processing wireless communication. It can be understood that the above-mentioned modem can also not be integrated into the processor 401, but can be realized by a separate chip.

[0107] The memory 405 can include a random access memory (RAM) and a read-only memory (ROM). Alternatively, the memory 405 includes a non-transitory computer-readable storage medium. The memory 405 can be used to store instructions, programs, codes, code sets or instruction sets. The memory 405 can include a program storage area and a data storage area, wherein the program storage area can store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the above-mentioned various method embodiments, etc.; the data storage area can store data involved in the above-mentioned various method embodiments, etc. The memory 405 can alternatively be at least one storage device located away from the aforementioned processor 401. Referring to Figure 4 The memory 405 as a computer storage medium can include an operating system, a network communication module, a user interface module, and an application program of a hazardous chemical storage tank intelligent sampling method.

[0108] In Figure 4In the electronic device 400 shown, the user interface 403 is mainly used to provide an interface for the user to input, and obtain data input by the user; and the processor 401 can be used to invoke an application program of a hazardous chemical substance storage tank intelligent sampling method stored in the memory 405, and when executed by one or more processors 401, the electronic device 400 performs the method described in one or more of the above embodiments. It should be noted that, for the foregoing method embodiments, in order to simply describe, they are all described as a combination of a series of actions, but those skilled in the art should know that the present application is not limited to the order of the actions described, because according to the present application, some steps can be performed in other order or at the same time. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0109] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0110] In several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic. The division of units is only a logical function division. There can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some service interface, device or unit, and can be electrical or other forms.

[0111] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0112] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0113] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable memory. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a memory and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the embodiments of the present application. The aforementioned memory includes: a U disk, a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0114] The above-described are only exemplary embodiments of the present disclosure, and cannot limit the scope of the present disclosure. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure are still within the scope of the present disclosure. Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon considering the specification and practicing the true principles of the present disclosure.

[0115] The present application is intended to cover any variations, uses or adaptive changes of the present disclosure that follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not recorded in the present disclosure. The specification and examples are only considered as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A dangerous chemical storage tank intelligent sampling system, characterized in that, Including storage tank (5), sampling cylinder (3), steel wire rope (4), roll box (10), drive motor (7) and sampling control box (9), the roll box (10) is provided with roll (11), wherein: The storage tank (5) and the roll box are both provided with a sampling port, and are connected by a flange (6); The sampling cylinder (3) is connected with one end of the steel wire rope (4), and the other end of the steel wire rope (4) is wound on the roll (11); The drive shaft of the drive motor (7) is axially fixedly connected with the roll (11); The sampling control box (9) is electrically connected with the drive motor (7) for controlling the sampling speed; The storage tank (5) is also provided with a high-frequency radar liquid level meter for detecting the liquid level in the storage tank (5); The outer wall of the sampling cylinder (3) is also provided with a counterweight (1) for sinking the sampling cylinder (3) to a specified depth.

2. The system of claim 1, wherein, The outer wall of the sampling cylinder (3) is also provided with a miniature electrostatic induction probe (2), wherein: The miniature electrostatic induction probe (2) is used for detecting the charge generated on the surface of the sampling cylinder (3).

3. The system of claim 1, wherein, The grounding end of the roll box (10) is connected in series with a high-frequency current sensor (8) for detecting the current flowing to the grounding end.

4. An intelligent sampling control method for a hazardous chemical storage tank, characterized in that, The method applied to the sampling control box (9) in any one of claims 1-3 comprises: According to the electric data collected by the miniature electrostatic induction probe (2) and the high-frequency current sensor (8), the charge generation rate and the charge dissipation rate on the surface of the sampling cylinder (3) are determined; It is judged whether the charge generation rate is greater than the charge dissipation rate; If yes, the sampling depth of the sampling cylinder (3) is obtained; Based on the sampling depth and the liquid level of the storage tank (5), the target sampling speed of the sampling cylinder (3) is determined; According to the target sampling speed, the power of the drive motor (7) is adjusted.

5. The method of claim 4, wherein, The target sampling speed of the sampling cylinder (3) is determined based on the sampling depth, specifically: If the sampling depth is below the liquid level of the storage tank (5), the flow state of the liquid dangerous chemical is determined according to the current sampling speed of the sampling cylinder (3); According to the flow state of the liquid dangerous chemical, the viscous drag of the liquid dangerous chemical on the sampling cylinder (3) is calculated; According to the viscous drag and the sampling depth, the cumulative potential energy is calculated; Based on the safety energy threshold of the dangerous chemical liquid, the target sampling speed of the sampling cylinder (3) is calculated.

6. The method of claim 4, wherein, The target sampling speed of the sampling cylinder (3) is determined based on the sampling depth, specifically: If the sampling depth is above the liquid level of the storage tank (5), it is judged whether the charge dissipation rate is greater than or equal to a preset threshold; If not, a first sampling speed adjustment coefficient is obtained according to 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).

7. The method of claim 6, wherein, The judgment of whether the charge generation rate is greater than or equal to a preset threshold further comprises: If the charge dissipation rate is greater than or equal to a preset threshold, a residual liquid film thickness on the sampling cylinder (3) is calculated according to the current sampling speed; An air phase concentration and a temperature in the storage tank (5) are obtained; A liquid film evaporation rate is determined according to the air phase concentration and the temperature; A residual liquid film coefficient is determined according to the residual liquid film thickness and the liquid film evaporation rate; The charge dissipation rate is adjusted according to the residual liquid film coefficient to obtain a risk charge dissipation rate; A second sampling speed adjustment coefficient is obtained according to a ratio of the risk charge dissipation rate to the charge generation rate; The current sampling speed is adjusted based on the second sampling speed adjustment coefficient to obtain a target sampling speed of the sampling cylinder (3).

8. An intelligent sampling control device for a hazardous chemical storage tank, characterized in that, The device is a sampling control box (9), which comprises an obtaining module (91), a processing module (92) and a control module (93), wherein: The obtaining module (91) is configured to determine a charge generation rate and a charge dissipation rate on the surface of the sampling cylinder (3) according to electric data collected by the micro electrostatic induction probe (2) and the high-frequency current sensor (8); The processing module (92) is configured to determine whether the charge generation rate is greater than the charge dissipation rate, and if so, to obtain a sampling depth of the sampling cylinder (3) and determine a target sampling speed of the sampling cylinder (3) based on the sampling depth and a liquid level of the storage tank (5); The control module (93) is configured to adjust the power of the driving motor (7) according to the target sampling speed.

9. An electronic device, comprising: The electronic device (400) comprises a processor (401), a memory (405), a user interface (403) and a network interface (404), the memory (405) is configured to store instructions, the user interface (403) and the network interface (404) are configured to communicate with other devices, and the processor (401) is configured to execute the instructions stored in the memory (405) to enable the electronic device (400) to perform the method of any one of claims 4 to 7.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores instructions which, when executed, perform the method of any one of claims 4 to 7.

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