Combustible ice mining automatic anti-blocking ball valve with optical fiber sensing and intelligent alcohol injection system

Abstract

A combustible ice mining automatic anti-blocking ball valve with an optical fiber sensing and intelligent alcohol injection system comprises a valve body provided with a medium channel and a valve cavity, and a ball body and a valve seat which are located in the valve cavity. The optical fiber sensing network is embedded in the inner wall of the valve body; the alcohol injection actuating mechanism comprises a plurality of groups of independent and controllable alcohol injection nozzles arranged in the valve body, and the alcohol injection nozzles respectively point to the upstream and the downstream of the valve seat; the intelligent control terminal is electrically connected with the optical fiber sensing network and the alcohol injection executing mechanism respectively; the intelligent control terminal comprises a data reconstruction module, a state identification module and a strategy execution module; the data reconstruction module is used for demodulating optical signals fed back by the optical fiber sensing network and mapping the optical signals into a real-time three-dimensional temperature field cloud picture and a local strain distribution picture in the valve cavity; and the state identification module is used for outputting a state instruction for representing the generation position and the growth stage of the hydrate based on the coupling relationship between the spatial and temporal change characteristics of the three-dimensional temperature field cloud picture and the local strain distribution diagram.

Description

Technical Field

[0001] This invention relates to an automatic anti-clogging ball valve for combustible ice mining with fiber optic sensing and intelligent alcohol injection system, belonging to the field of valve technology. Background Technology

[0002] Methane hydrate, a highly promising clean alternative energy source, is typically extracted in complex multiphase flow environments characterized by high pressure and low temperature. Ball valves, as key control components in subsea gathering and transportation systems and wellhead equipment, play a crucial role in regulating flow and cutting off the medium. However, in deep-sea extraction operations, the throttling effect of the medium flowing through the valve can cause localized temperature drops, leading to the rapid formation and accumulation of hydrates in the valve cavity dead zone, valve seat sealing surface, or ball channel.

[0003] Existing anti-clogging technologies mainly rely on continuous injection of hot fluids or chemical inhibitors, or passive clogging detection based on the pressure difference between inlet and outlet. This "blind injection" or "reactive" approach has significant limitations: on the one hand, due to the lack of real-time sensing of the thermodynamic state inside the valve cavity, it is difficult to intervene precisely in the initial nucleation stage of hydrate formation, often resulting in excessive waste of inhibitors or the injection site failing to cover the actual blockage point; on the other hand, single pressure monitoring methods have serious lag, and by the time an abnormal pressure difference is detected, a hard ice blockage has often formed inside the valve, which can easily cause valve jamming or even pipeline rupture.

[0004] Therefore, there is an urgent need to improve existing technologies to solve the technical problems of existing combustible ice mining valves lacking real-time internal status sensing capabilities and being unable to achieve precise and proactive anti-blocking. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide an automatic anti-blocking ball valve for combustible ice mining with fiber optic sensing and intelligent alcohol injection system.

[0006] This invention provides an automatic anti-clogging ball valve for combustible ice mining with an optical fiber sensing and intelligent alcohol injection system. The valve includes a valve body with a medium channel and a valve cavity, and a ball located within the valve cavity; an optical fiber sensing network embedded in the inner wall of the valve body; an alcohol injection actuator including several independently controllable alcohol injection nozzles located within the valve body, the nozzles pointing upstream and downstream of the valve seat; and an intelligent control terminal electrically connected to both the optical fiber sensing network and the alcohol injection actuator. The intelligent control terminal includes a data reconstruction module, a state identification module, and a strategy execution module. The data reconstruction module demodulates and maps the optical signal fed back by the optical fiber sensing network into a real-time three-dimensional temperature field cloud map and a local strain distribution map inside the valve cavity. The state identification module outputs a state command characterizing the hydrate formation location and growth stage based on the spatiotemporal variation characteristics of the three-dimensional temperature field cloud map and the coupling relationship between the local strain distribution map and the state command. The strategy execution module responds to the state command by calling corresponding alcohol injection waveform parameters from a preset strategy library and outputting a drive signal to the corresponding area of ​​the alcohol injection nozzle in the alcohol injection actuator.

[0007] Furthermore, the data reconstruction module is also connected to an environmental benchmark database; the data reconstruction module is used to perform differential operations on the real-time collected data and the normal thermal characteristic model in the database to remove environmental background noise.

[0008] Furthermore, the state identification module is equipped with a dual-parameter coupling determination unit; the dual-parameter coupling determination unit outputs a state command for the wall-mounted nucleation period only when the temperature drop rate of the monitored area exceeds a preset nucleation threshold and the corresponding local strain undergoes a nonlinear abrupt change; otherwise, it maintains the monitoring state or only outputs a fluid low-temperature warning.

[0009] Furthermore, the strategy execution module employs a PWM output unit; the PWM output unit dynamically adjusts the duty cycle of the voltage pulse output to the alcohol injection actuator according to the severity of the hydrate growth stage contained in the status command; the alcohol injection waveform parameters are configured as follows: outputting intermittent pulses with a low duty cycle during the wall-mounting nucleation period, and outputting continuous pressure wave pulses with a high duty cycle during the complete blockage period.

[0010] Furthermore, the alcohol injection actuator comprises several groups of alcohol injection nozzles forming a multi-zone alcohol injection array, which is spatially divided into an upstream valve seat area and a downstream stagnation area; the strategy execution module has a spatial mapping function, which is used to activate only the group of alcohol injection nozzles covering the coordinate area according to the position coordinates in the status command for targeted alcohol injection.

[0011] Furthermore, the intelligent control terminal also includes an action coupling trigger module; the action coupling trigger module is used to monitor the opening and closing position signal of the sphere; when the sphere is detected to be in the throttling opening range that is prone to freezing, the module bypasses the state identification module and directly triggers the strategy execution module to generate a defensive alcohol injection command covering the entire process of the sphere's action.

[0012] Furthermore, the intelligent control terminal also includes a closed-loop feedback evaluation module; during the alcohol injection operation, the closed-loop feedback evaluation module tracks the temperature rise trend and strain release degree of the target area in real time; when the monitored value meets the preset unblocking completion condition, the module sends a blocking signal to the strategy execution module to forcibly stop the alcohol injection operation.

[0013] The beneficial effects of the present invention are as follows: 1. Real-time visualization monitoring of the three-dimensional temperature field and strain field inside the valve cavity is realized, which can accurately locate the specific location of hydrate formation and eliminate monitoring blind spots.

[0014] 2. By using the dual-parameter coupling of temperature and strain, it can accurately distinguish between low fluid temperature and actual freezing, greatly reducing the false alarm rate, and can intervene in the early stage of hydrate nucleation.

[0015] 3. By adopting zoned targeted alcohol injection and PWM pulse modulation technology, existing ice blockages can be broken up by high-voltage pulse waves, and nucleation can be suppressed by low duty cycle pulses. This significantly improves alcohol injection efficiency, reduces the amount of chemical inhibitors used, and lowers the risk of marine environmental pollution.

[0016] 4. It has an action coupling triggering mechanism to provide predictive defense against the high-risk operating condition of valve throttling, transforming passive clearing from active prevention of blockage, which greatly improves the reliability and safety of the system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0018] Figure 1 This is a schematic diagram of the overall structure of the deep-sea mining safety valve of the present invention; Figure 2 This is a schematic cross-sectional view of the safety valve for deep-sea mining according to the present invention. Figure 3 This is a flowchart of the system state identification and control of the present invention; Figure 4 Flowchart of intelligent alcohol injection execution and feedback control; In the diagram, 1 is the valve body; 2 is the valve chamber; 3 is the medium channel; 4 is the valve seat; 5 is the fiber optic sensor network; 6 is the alcohol injection actuator; and 7 is the alcohol injection nozzle. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0021] The directional and positional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.

[0022] See Figure 1-4 This invention provides an automatic anti-clogging ball valve for combustible ice mining with an optical fiber sensing and intelligent alcohol injection system. The valve includes a valve body with a medium channel and a valve cavity, and a ball located within the valve cavity; an optical fiber sensing network embedded in the inner wall of the valve body; an alcohol injection actuator including several independently controllable alcohol injection nozzles located within the valve body, the nozzles pointing upstream and downstream of the valve seat; and an intelligent control terminal electrically connected to both the optical fiber sensing network and the alcohol injection actuator. The intelligent control terminal includes a data reconstruction module, a state identification module, and a strategy execution module. The data reconstruction module demodulates and maps the optical signal fed back by the optical fiber sensing network into a real-time three-dimensional temperature field cloud map and a local strain distribution map inside the valve cavity. The state identification module outputs a state command characterizing the hydrate formation location and growth stage based on the spatiotemporal variation characteristics of the three-dimensional temperature field cloud map and the coupling relationship between the local strain distribution map and the state command. The strategy execution module responds to the state command by calling corresponding alcohol injection waveform parameters from a preset strategy library and outputting a drive signal to the corresponding area of ​​the alcohol injection nozzle in the alcohol injection actuator.

[0023] In the extraction of combustible ice, spheres are installed in the medium channels and valve chambers inside the valve body to regulate the flow of the medium and create a throttling effect. An optical fiber sensing network is embedded in the inner wall of the valve body to continuously capture minute temperature changes and local strain information within the valve chamber. The data reconstruction module demodulates and maps the optical signals fed back by the optical fiber sensing network into a real-time three-dimensional temperature field cloud map and a local strain distribution map inside the valve chamber, making the previously invisible internal thermodynamic state visible. Furthermore, the state identification module analyzes the initial nucleation points and development stages of hydrate formation based on the spatiotemporal variation characteristics of the three-dimensional temperature field cloud map and the coupling relationship with the local strain distribution map, and outputs corresponding state commands. The strategy execution module responds to the state commands, calls the matching alcohol injection waveform parameters from the preset strategy library, and outputs a drive signal to the corresponding area of ​​the alcohol injection nozzle in the alcohol injection actuator, thereby achieving dynamic intervention in the hydrate formation process.

[0024] The present invention further proposes that the state identification module is equipped with a dual-parameter coupling determination unit; the dual-parameter coupling determination unit outputs a state command for the wall-mounted nucleation period only when the temperature drop rate of the monitored area exceeds a preset nucleation threshold and the corresponding local strain undergoes a nonlinear abrupt change; otherwise, it maintains the monitoring state or only outputs a low-temperature fluid warning. Here, the dual parameters refer to the temperature change parameter and the structural strain parameter of the local area of ​​the valve cavity, which are respectively derived from the distributed temperature signal and strain signal in the fiber optic sensor network.

[0025] The nucleation threshold is used to characterize the critical conditions for the transformation of hydrates from a supercooled state to the initial nucleation stage. This threshold can be pre-calibrated according to different well depths, pressures, and gas compositions.

[0026] The state identification module performs joint analysis on the rate of change of temperature gradient and the slope of strain curve within a continuous time window. Only when both meet the preset coupling conditions is it determined to be the hydrate wall nucleation stage, thus avoiding misjudgment caused by a single temperature fluctuation or mechanical disturbance.

[0027] As a specific implementation method, the temperature decrease rate of the monitoring area is set as follows: Where T represents the local temperature value and t represents time; The corresponding local strain change rate is: Where ε represents the strain value measured by the fiber optic sensor.

[0028] when At that time, the system outputs the status command for the wall-mounted nucleation period, where α is the temperature nucleation threshold coefficient and β is the strain mutation threshold coefficient.

[0029] Specifically, the proposed solution constructs a hydrate nucleation identification logic through a dual-parameter coupling judgment mechanism of temperature drop rate and local strain. When the temperature field data fed back in real time by the fiber optic sensor network is processed by the data reconstruction module, if the temperature drop rate of the monitored area exceeds the preset nucleation threshold, it indicates that the area may have entered the thermodynamic conditions for hydrate nucleation. At the same time, if the local strain distribution map synchronously shows nonlinear abrupt change characteristics, it verifies the instantaneous mechanical response of hydrate crystal growth to the valve body structure. The dual-parameter coupling judgment unit outputs the wall-mounted nucleation period status command only when the above two conditions are met simultaneously, thereby eliminating the risk of misjudgment caused by temperature anomalies caused by ambient temperature fluctuations alone or strain changes caused by mechanical vibrations alone. If either condition is not met, the system maintains the monitoring state or only outputs a low fluid temperature warning to avoid initiating unnecessary alcohol injection actions for non-nucleation conditions, thus forming a precise identification mechanism based on thermo-mechanical dual-physics field coupling analysis.

[0030] Through the above scheme, this application effectively distinguishes between the actual hydrate nucleation risk and ordinary low-temperature operating conditions, significantly reduces the probability of false triggering caused by single parameter monitoring, ensures timely initiation of targeted alcohol injection intervention in the initial stage of wall-mounted nucleation, thereby reducing inhibitor waste and improving the timeliness of system response, and providing accurate and reliable active anti-blocking capability for combustible ice mining ball valves.

[0031] The present invention further proposes that the strategy execution module adopts a PWM output unit; the PWM output unit dynamically adjusts the voltage pulse duty cycle output to the alcohol injection actuator according to the severity of the hydrate growth stage contained in the status command; the alcohol injection waveform parameters are configured as follows: outputting intermittent pulses with low duty cycle during the wall-mounting nucleation period, and outputting continuous pressure wave pulses with high duty cycle during the complete blockage period.

[0032] The PWM output unit is used to convert the control strategy into an executable alcohol injection drive signal, and to achieve fine control of the alcohol injection intensity and duration by adjusting the duty cycle.

[0033] Specifically, the strategy execution module should automatically match the corresponding alcohol injection waveform pattern based on the hydrate growth stage identifier output by the state identification module, in order to avoid excessive or insufficient alcohol injection.

[0034] As a specific implementation method, let the period of the PWM signal be T. p The high-level duration is t on The duty cycle is then defined as: During the wall-mounted nucleation period, D=D1 is set, where D1 is a low duty cycle parameter; During the period of complete blockage, set D=D2, where D2>D1, to create a continuous pressure wave alcohol injection effect.

[0035] Specifically, the solution in this application receives status commands from the status identification module through a PWM output unit, analyzes the severity information of the hydrate growth stage contained therein, and calculates and adjusts the duty cycle of the voltage pulse output to the alcohol injection actuator in real time accordingly. When the status command indicates the wall-mounted nucleation stage, the system automatically configures a low-duty-cycle intermittent pulse output mode to maintain a continuous, minute injection of inhibitor and prevent the diffusion of the initial nucleation point. When the status command indicates the complete blockage stage, it switches to a high-duty-cycle continuous pressure wave pulse output mode to break up the dense hydrate structure by enhancing the fluid impact force. This dynamic adjustment mechanism based on severity grading establishes a precise gradient response relationship between the alcohol injection intensity and the hydrate formation process, thereby optimizing inhibitor consumption while ensuring the anti-blockage effect.

[0036] Through the above technical solution, this application achieves dynamic matching between the alcohol injection intensity and the hydrate growth stage. During the wall-mounted nucleation stage, it maintains the anti-blocking effect with low energy consumption to avoid wasting inhibitors. During the complete blockage stage, it provides sufficient energy to break up the hardened blockage. This effectively solves the problems of anti-blocking failure caused by insufficient alcohol injection and resource waste caused by excessive alcohol injection, and significantly improves the accuracy and energy efficiency of ball valve anti-blocking operation during combustible ice mining.

[0037] The present invention further proposes that the intelligent control terminal also includes a closed-loop feedback evaluation module; during the execution of the alcohol injection operation, the closed-loop feedback evaluation module tracks the temperature rise trend and strain release degree of the target area in real time; when the monitored value meets the preset unblocking completion condition, the module sends a blocking signal to the strategy execution module to forcibly stop the alcohol injection operation.

[0038] The unblocking completion condition is used to characterize that the hydrate structure has been effectively destroyed or dissolved, preventing unnecessary continuous alcohol injection.

[0039] Specifically, the closed-loop feedback evaluation module should compare and analyze the data before and after alcohol injection, and only terminate the alcohol injection command after confirming that the blockage risk has been eliminated.

[0040] As a specific implementation method, let the temperature rise after alcohol injection be ΔT, and the strain release be Δε. When When the blockage is cleared, it is determined that the unblocking is complete, where γ and δ are the unblocking criterion thresholds for temperature and strain, respectively.

[0041] Specifically, the solution in this application uses a closed-loop feedback evaluation module to simultaneously collect temperature and strain data of the target area from the fiber optic sensor network during the alcohol injection process. Based on the coupling relationship between the temperature rise trend and the degree of strain release, real-time status determination is performed. When the monitoring values ​​of both parameters simultaneously meet the preset unblocking completion conditions, a blocking signal is immediately generated and transmitted to the strategy execution module, thus forming a complete closed-loop control loop from monitoring, determination to termination. This effectively avoids the risk of misjudgment caused by relying on monitoring of only a single parameter and ensures that the alcohol injection process terminates in a timely manner after unblocking is completed.

[0042] Through the above technical solution, this application realizes real-time evaluation and automatic termination of the deblocking effect, effectively avoids excessive injection of inhibitors after deblocking, and prevents the risk of secondary blockage caused by premature cessation of alcohol injection, significantly improving the resource utilization efficiency and operational reliability of the anti-blocking system.

[0043] The present invention further proposes that the alcohol injection actuator comprises several groups of alcohol injection nozzles forming a multi-zone alcohol injection array, which is spatially divided into an upstream valve seat area and a downstream stagnation area; the strategy execution module has a spatial mapping function, which is used to activate only the group of alcohol injection nozzles covering the coordinate area according to the position coordinates in the status command for targeted alcohol injection.

[0044] The spatial mapping function is used to match the three-dimensional position coordinates sensed by the fiber optic sensing network with the arrangement area of ​​the alcohol injection nozzle.

[0045] Specifically, the strategy execution module establishes a valve cavity spatial coordinate system to achieve precise selection of the alcohol injection nozzle, avoiding alcohol injection in irrelevant areas.

[0046] As a specific implementation method, let the coordinates of the hydrate formation location be (x, y, z), and the coverage area function of the alcohol injection nozzle be F. i (x,y,z), when At that time, the i-th group of alcohol injection nozzles is activated.

[0047] The multi-zone alcohol injection array refers to the configuration of alcohol injection nozzles into multiple independent and controllable zones. This can be achieved through a zoning method based on the valve cavity geometry and fluid dynamics characteristics. The purpose is to enable differentiated control of the alcohol injection action for different risk areas. The upstream valve seat area can be understood as the area upstream of the valve seat, specifically the upstream side of the contact surface between the ball and the valve seat. Its purpose is to cover high-risk areas where the temperature drops sharply due to the throttling effect of the medium. The downstream stagnation area specifically refers to the area where the fluid flow is slow downstream of the valve cavity, such as the bottom of the valve body or a corner. Its purpose is to provide key protection for areas prone to local liquid accumulation. The spatial mapping function refers to the ability of the strategy execution module to map position coordinates to the corresponding nozzle group. This can be achieved using coordinate transformation algorithms or a preset spatial mapping table. The purpose is to ensure that the alcohol injection action accurately covers the hydrate formation point.

[0048] The above approach ensures that the inhibitor is injected only into the actual hydrate formation area, significantly reducing inhibitor waste. At the same time, targeted alcohol injection ensures that key blockage points are fully covered, improving the targeting and effectiveness of anti-blockage actions, thereby solving the problems of excessive inhibitor waste and low anti-blockage efficiency.

[0049] The present invention further proposes that the intelligent control terminal also includes an action coupling trigger module; the action coupling trigger module is used to monitor the opening and closing position signal of the sphere; when the sphere is identified to be in the throttling opening range that is prone to freezing, the module bypasses the state identification module and directly triggers the strategy execution module to generate a defensive alcohol injection command covering the entire process of the sphere's action.

[0050] The throttling opening range that is prone to freezing refers to the dangerous range in which the sphere is in a non-fully open or non-fully closed state, resulting in high shear and local pressure drop.

[0051] Specifically, this solution achieves preventative alcohol injection by coupling valve mechanical actions with anti-clogging strategies.

[0052] As a specific implementation method, let the aperture of the sphere be θ, when At that time, defensive alcohol injection is directly triggered, where θ1 and θ2 are the boundary values ​​of the throttling danger zone.

[0053] In practical applications, the action coupling trigger module refers to a monitoring unit used to acquire the rotation angle status of the sphere in real time. It can be implemented using one or more combinations of rotary encoders, Hall sensors, or potentiometers. Its purpose is to establish a direct correlation between the sphere's position and the throttling effect, avoiding indirect monitoring methods that rely on temperature or strain changes. The icing-prone throttling opening range can be understood as a specific angle range that is prone to causing local temperature drops during the opening and closing of the sphere. It can be determined through historical blockage data calibration or fluid dynamics simulation. Its purpose is to predict high-risk operation windows. The bypass state identification module specifically refers to the action coupling trigger module directly sending a trigger signal to the strategy execution module when it identifies a high-risk range, skipping the processing steps of the data reconstruction module and the state identification module. Its purpose is to eliminate the time delay between fiber optic sensor data demodulation and coupling determination. The defensive alcohol injection command can be understood as a preset alcohol injection waveform covering the entire process of the sphere's action. It can be configured as a continuous pressure wave pulse or an intermittent pulse sequence. Its purpose is to continuously provide inhibitor coverage before the temperature drop occurs.

[0054] Through the above technical solution, this application effectively eliminates the data processing delay problem of the state identification module in the dynamic operation of the sphere, realizes preventive anti-blocking protection for the throttling opening range that is prone to freezing, ensures timely blocking of the rapid nucleation and growth of hydrates during valve opening and closing, and significantly reduces the risk of valve blockage under dynamic operation.

[0055] The present invention further proposes that the data reconstruction module is also connected to an environmental benchmark database. The data reconstruction module is used to perform differential operations on the real-time collected data and the normal thermal feature model in the database to remove environmental background noise.

[0056] The environmental benchmark database is used to store temperature and strain distribution models of the valve body under different operating conditions during normal operation.

[0057] Specifically, differential processing can significantly improve the signal-to-noise ratio for hydrate anomaly identification.

[0058] As a specific implementation method, let the real-time measurement value be S. r The baseline model value is S b The difference result is ΔS is used as the input data for the state identification module.

[0059] This invention achieves real-time sensing of the temperature field and strain state inside the valve cavity by constructing an optical fiber sensing network inside the ball valve body; the intelligent control terminal reconstructs, couples, and identifies the state of the sensing data, and calls the corresponding alcohol injection control strategy according to the location and stage of hydrate formation; the alcohol injection actuator implements targeted alcohol injection in a partitioned, pulsed, and closed-loop manner, while combining the opening and closing action of the ball for defensive linkage control, thereby achieving intelligent prevention and efficient resolution of the risk of hydrate blockage during the extraction of combustible ice.

[0060] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

[0061] While the invention has been described with reference to several specific embodiments, it should be understood that the invention is not limited to the disclosed specific embodiments. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. An automatic anti-clogging ball valve for combustible ice mining with fiber optic sensing and intelligent alcohol injection system, characterized in that, The system includes a valve body with a medium channel and a valve cavity, and a ball and a valve seat located within the valve cavity; an optical fiber sensing network embedded in the inner wall of the valve body; an alcohol injection actuator including several independently controllable alcohol injection nozzles located within the valve body, the nozzles pointing upstream and downstream of the valve seat; and an intelligent control terminal electrically connected to both the optical fiber sensing network and the alcohol injection actuator. The intelligent control terminal includes a data reconstruction module, a state identification module, and a strategy execution module. The data reconstruction module demodulates and maps the optical signal fed back by the optical fiber sensing network into a real-time three-dimensional temperature field cloud map and a local strain distribution map inside the valve cavity. The state identification module outputs state commands characterizing the hydrate formation location and growth stage based on the spatiotemporal variation characteristics of the three-dimensional temperature field cloud map and the coupling relationship between the local strain distribution map and the state command. The strategy execution module responds to the state commands by calling corresponding alcohol injection waveform parameters from a preset strategy library and outputting drive signals to the corresponding area of ​​the alcohol injection nozzles in the alcohol injection actuator.

2. The automatic anti-blocking ball valve for combustible ice mining with fiber optic sensing and intelligent alcohol injection system as described in claim 1, characterized in that, The state identification module is equipped with a dual-parameter coupling determination unit; the dual-parameter coupling determination unit outputs the state command for the wall nucleation period only when the temperature drop rate of the monitored area exceeds the preset nucleation threshold and the corresponding local strain undergoes a nonlinear change; otherwise, it maintains the monitoring state or only outputs a fluid low temperature warning.

3. The automatic anti-blocking ball valve for combustible ice mining with fiber optic sensing and intelligent alcohol injection system as described in claim 1, characterized in that, The strategy execution module adopts a PWM output unit; the PWM output unit dynamically adjusts the voltage pulse duty cycle output to the alcohol injection actuator according to the severity of the hydrate growth stage contained in the status command; the alcohol injection waveform parameters are configured as follows: outputting intermittent pulses with low duty cycle during the wall-mounting nucleation period, and outputting continuous pressure wave pulses with high duty cycle during the complete blockage period.

4. The automatic anti-blocking ball valve for combustible ice mining with fiber optic sensing and intelligent alcohol injection system as described in claim 1, characterized in that, The intelligent control terminal also includes a closed-loop feedback evaluation module; during the alcohol injection operation, the closed-loop feedback evaluation module tracks the temperature rise trend and strain release degree of the target area in real time; when the monitored value meets the preset unblocking completion condition, the module sends a blocking signal to the strategy execution module to forcibly stop the alcohol injection operation.

5. The automatic anti-blocking ball valve for combustible ice mining with fiber optic sensing and intelligent alcohol injection system as described in claim 1, characterized in that, The alcohol injection actuator comprises several groups of alcohol injection nozzles forming a multi-zone alcohol injection array, which is spatially divided into an upstream valve seat area and a downstream stagnation area. The strategy execution module has a spatial mapping function, which is used to activate only the group of alcohol injection nozzles covering the coordinate area according to the position coordinates in the status command for targeted alcohol injection.

6. The automatic anti-blocking ball valve for combustible ice mining with fiber optic sensing and intelligent alcohol injection system as described in claim 1, characterized in that, The intelligent control terminal also includes an action coupling trigger module; the action coupling trigger module is used to monitor the opening and closing position signal of the sphere; when the sphere is detected to be in the throttling opening range that is prone to freezing, the module bypasses the state identification module and directly triggers the strategy execution module to generate a defensive alcohol injection command covering the entire process of the sphere's action.

7. The automatic anti-clogging ball valve for combustible ice mining with fiber optic sensing and intelligent alcohol injection system as described in claim 1, characterized in that, The data reconstruction module is also connected to an environmental benchmark database. The data reconstruction module is used to perform differential operations on the real-time collected data and the normal thermal characteristic model in the database to remove environmental background noise.

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