Intelligent methanol ship purging system based on digital twinning and purging method thereof

Abstract

The invention discloses a methanol ship intelligent purging system based on digital twinning and a purging method of the methanol ship intelligent purging system, and belongs to the technical field of ships. The system comprises a visual sensing module, an intelligent control module and a purging module, the visual sensing module comprises a pressure sensor, a methanol sensor and a high-definition camera; the purging module comprises water pump purging and nitrogen purging; the intelligent control module controls the purging module to perform purging, and the purging module performs water pump purging and then performs nitrogen purging; the intelligent control module obtains the nitrogen purging time by the following steps: (1) obtaining the initial purging time # imgabs0 #; (2) after the initial purging time, performing evaluation; (3) if the evaluation result is not met, the purging time is prolonged until the requirement is met; (4) establishing a safety coefficient # imgabs1 #; and (5) obtaining a calculation formula of nitrogen purging time: # imgabs2 #. The method has the advantages that the purging time is optimized, nitrogen consumption and storage space are saved, and energy-saving and efficient cleaning is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and particularly relates to an intelligent purging system for a methanol ship based on digital twin and a purging method thereof. Background Art

[0002] With the continuous development and application of clean energy, methanol ships can greatly reduce the emissions of nitrogen oxides, sulfur oxides and particulate matter, becoming the development trend of future ship power systems. However, methanol is a flammable, explosive and toxic gas. Its leakage not only poses a threat to personnel safety, but also causes unstable factors such as corrosion.

[0003] Currently, the existing purging systems for methanol pipelines are still in their infancy and have the following problems: The current purging method is to directly introduce nitrogen into the intake port for purging, resulting in a large consumption of nitrogen reserves, affecting the storage space inside the ship. Moreover, it belongs to excessive purging, causing waste. Summary of the Invention

[0004] The purpose of the present invention is to address the deficiencies of the prior art and provide an intelligent purging system for a methanol ship based on digital twin and a purging method thereof, which optimize the purging time, save nitrogen consumption and storage space, and achieve energy-saving and efficient cleaning.

[0005] In order to achieve the above-mentioned invention purpose, the following technical solutions are adopted for the intelligent purging system for a methanol ship based on digital twin and the purging method thereof in the present invention:

[0006] An intelligent purging system for a methanol ship based on digital twin includes a visual perception module, an intelligent control module and a purging module; the visual perception module includes a pressure sensor, a methanol sensor and a high-definition camera. The pressure sensor is arranged on the wall of the methanol pipeline and is used to detect the residual liquid pressure in the methanol pipeline. The methanol sensor is arranged inside the methanol pipeline and is used to detect the methanol concentration in the methanol pipeline. The high-definition camera is arranged on the wall of the methanol pipeline and is used to record the distribution of the residual liquid in the methanol pipeline; the purging module includes water pump purging and nitrogen purging. Water pump purging is to pump water into the methanol pipeline for purging, and nitrogen purging is to transport nitrogen to the methanol pipeline for purging;

[0007] The intelligent control module issues a purging instruction to control the purging module to perform purging. The purging module first performs water pump purging, and then performs nitrogen purging after the water pump purging ends;

[0008] The steps for the intelligent control module to obtain the nitrogen purging time are as follows:

[0009] (1) Obtain the initial purging time. The calculation formula for the initial purging time is:

[0010]

[0011] In the formula, Q is the total volume of the methanol pipeline, v is the average velocity of the purge port, A is the area of the purge port, and t1 is the initial purge time, where the initial purge time is the theoretical purge time;

[0012] (2) After the initial purge time, evaluation is carried out based on the data fed back by the pressure sensor, methanol sensor and high-definition camera;

[0013] (3) If the evaluation result does not meet the purge effect, the purge time is increased until the requirements are met. At this time, the total time used for nitrogen purge is the actual purge time;

[0014] (4) A safety factor is established, and the formula for the safety factor is:

[0015]

[0016] In the formula, t1 is the theoretical purge time, t2 is the actual purge time, and c is the safety factor;

[0017] (5) The calculation formula for obtaining the nitrogen purge time is:

[0018]

[0019] In the formula, t is the nitrogen purge time, c is the safety factor, Q is the total volume of the methanol pipeline, v is the average velocity of the purge port, and A is the area of the purge port;

[0020] Moreover, it is ensured that the total nitrogen consumption V < 3.0×Q.

[0021] Preferably, the purge mode of the nitrogen purge includes a basic purge mode and a flow field disturbance purge mode; the basic purge mode is that nitrogen continuously and uninterruptedly flows to purge the methanol pipeline at a constant velocity or pressure until the predetermined purge time is completed; the flow field disturbance purge mode is intermittent purge or simple harmonic purge. When the methanol concentration in a local area cannot be reduced, the flow field disturbance purge mode is switched to for nitrogen purge.

[0022] Preferably, the purge module further includes valve purge. The water pump purge is to pump the water in the water storage tank into the methanol pipeline for purge, and the nitrogen purge is to transport the nitrogen in the nitrogen tank to the methanol pipeline for purge. Both the water storage tank and the nitrogen tank are connected to the methanol pipeline through a delivery pipe. An electric control valve is provided at the connection between the methanol pipeline and the delivery pipe, and a water pump is provided on the delivery pipe between the electric control valve and the water storage tank; the valve purge is carried out through a valve purge gun provided on the inner wall of the methanol pipeline. The valve purge gun is connected to the water storage tank and is close to the electric control valve.

[0023] Preferably, the visual perception module further includes a liquid level detector, which is arranged inside the collector connected to the methanol pipeline, and the collector is used to collect the purged methanol waste liquid.

[0024] A purging method using a digital twin-based intelligent purging system for methanol ships includes the following steps:

[0025] S1 Real-time monitoring of the methanol pipeline status: Through a pressure sensor, a methanol sensor, and a high-definition camera, the residual liquid pressure, methanol concentration, and residual liquid distribution image inside the methanol pipeline are obtained in real time;

[0026] S2 The visual perception module displays the three-dimensional space map of the methanol pipeline on the work screen of the detector in real time. If the residual liquid pressure exceeds the threshold, the methanol concentration exceeds the standard, or there is residual liquid adhesion, at this time, the visual perception module transmits the data to the intelligent control module, and the intelligent control module issues a purging instruction to control the purging module to purge. The purging module first performs water pump purging;

[0027] S3 After the water pump purging is completed, the intelligent control module controls the purging module to perform nitrogen purging and calculates the nitrogen purging time;

[0028] S4 First calculate the initial purging time of nitrogen: Based on the total volume Q of the methanol pipeline, the average speed v of the purging port, and the area A of the purging port, calculate the initial purging time And start the purging module to perform the initial purging;

[0029] S5 Dynamically adjust the purging time: After the initial purging time ends, evaluate the purging effect according to the feedback data of the visual perception module. If the residual liquid pressure does not drop to the threshold, the methanol concentration exceeds the standard, or there is residual liquid adhesion, extend the purging time to the total time t2 and calculate the safety factor The final purging time is adjusted to At the same time, control the total nitrogen consumption V < 3.0×Q;

[0030] S6 Optimize the purging mode: When the methanol concentration in a local area cannot be reduced, switch the basic purging method to the flow field disturbance purging method, and use intermittent purging or simple harmonic purging.

[0031] Preferably, in step S2, if methanol residue is found near the electric control valve through the high-definition camera, the valve purging gun is opened at the same time for purging.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] 1. The present invention analyzes the nitrogen purging time and purging effect through an intelligent control system, ensuring the purging effect while optimizing the purging time, avoiding the over-purging situation in the prior art, and achieving an energy-saving and efficient cleaning effect on methanol.

[0034] 2. The present invention uses a purging method of water first and then gas. First, water is used to dilute methanol to prevent methanol from adhering to the inner wall of the pipeline, and then nitrogen purging is carried out for thorough cleaning. Through this purging method, the cleaning effect of methanol is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is the overall structural schematic diagram of the device of the present invention;

[0036] Figure 2 is the schematic diagram of the intelligent purging system of the device of the present invention;

[0037] Among them, 1 is a nitrogen tank, 2 is a water storage tank, 3 is a generator, 4 is a collector, 5 is a liquid level detector, 6 is a pressure sensor, 7 is a methanol sensor, 8 is a high-definition camera, 9 is a methanol pipeline, 10 is a valve purging gun, 11 is a delivery pipe, 12 is an electric control valve, and 13 is a water pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The present invention will be further clarified below in conjunction with the specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, various equivalent modifications made by those skilled in the art to the present invention all fall within the scope defined by the appended claims of this application.

[0039] Such as Figure 1-2As shown in the figure, an intelligent purging system for methanol ships based on digital twins includes a visual perception module, an intelligent control module, and a purging module; the visual perception module includes a pressure sensor 6, a methanol sensor 7, and a high-definition camera 8. The pressure sensor 6 is arranged on the wall of the methanol pipeline 9 and is used to detect the residual liquid pressure in the methanol pipeline 9. The methanol pipeline 9 is used to supply methanol to the generator 3; the methanol sensor 7 is arranged inside the methanol pipeline 9 and is used to detect the methanol concentration in the methanol pipeline 9; the high-definition camera 8 is arranged on the wall of the methanol pipeline 9 and is used to record the distribution of the residual liquid in the methanol pipeline 9. The visual perception module further includes a liquid level detector 5. The liquid level detector 5 is arranged inside the collector 4 connected to the methanol pipeline 9. The collector 4 is used to collect the purged methanol waste liquid and is used to feedback the liquid height in the collector 4 to remind the personnel to handle and discharge the waste liquid. The purging module includes water pump purging and nitrogen purging. Water pump purging is to pump the water in the water storage tank 2 into the methanol pipeline 9 for purging. Nitrogen purging is to transport the nitrogen in the nitrogen tank 1 to the methanol pipeline 9 for purging. Both the water storage tank 2 and the nitrogen tank 1 are connected to the methanol pipeline 9 through the delivery pipe 11. An electric control valve 12 is arranged at the connection between the methanol pipeline and the delivery pipe. A water pump 13 is arranged on the delivery pipe between the electric control valve 12 and the water storage tank. The purging module further includes valve purging. Valve purging is to purge through the valve purging gun 10 arranged on the inner wall of the methanol pipeline 9. The valve purging gun 10 is connected to the water storage tank 2 and is closely adjacent to the electric control valve 12.

[0040] The intelligent control module issues a purging instruction to control the purging module to perform purging. The purging module first performs water pump purging, and after the water pump purging is completed, nitrogen purging is performed.

[0041] The steps for the intelligent control module to obtain the nitrogen purging time are as follows:

[0042] (1) Obtain the initial purging time. The calculation formula for the initial purging time is:

[0043]

[0044] In the formula, Q is the total volume of the methanol pipeline, v is the average velocity of the purging port, A is the area of the purging port, and t1 is the initial purging time. The initial purging time is the theoretical purging time.

[0045] (2) After the initial purging time, evaluate through the data fed back by the pressure sensor 6, the methanol sensor 7, and the high-definition camera 8.

[0046] (3) If the evaluation result does not meet the purging effect, increase the purging time until the requirement is met. At this time, the total time used for nitrogen purging is the actual purging time.

[0047] (4) Establish a safety factor. The formula for the safety factor is:

[0048]

[0049] Where, t1 is the theoretical purging time, t2 is the actual purging time, and c is the safety factor;

[0050] (5) The calculation formula for obtaining the nitrogen purging time is:

[0051]

[0052] Where, t is the nitrogen purging time, c is the safety factor, Q is the total volume of the methanol pipeline, v is the average velocity of the purging port, and A is the area of the purging port;

[0053] Moreover, ensure that the total nitrogen consumption V < 3.0 × Q.

[0054] Furthermore, the purging methods of nitrogen purging include the basic purging method and the flow field disturbance purging method; the basic purging method is that nitrogen continuously and uninterruptedly flows to purge the methanol pipeline 9 at a constant velocity or pressure until the predetermined purging time is completed; the flow field disturbance purging method is intermittent purging or simple harmonic purging. When the methanol concentration in a local area cannot be reduced, switch to the flow field disturbance purging method for nitrogen purging.

[0055] A purging method using an intelligent purging system for methanol ships based on digital twins includes the following steps:

[0056] S1 Monitor the status of the methanol pipeline 9 in real time: Through the pressure sensor 6, methanol sensor 7, and high-definition camera 8, obtain the residual liquid pressure, methanol concentration, and residual liquid distribution image inside the methanol pipeline 9 in real time;

[0057] S2 The visualization perception module displays the three-dimensional space map of the methanol pipeline 9 on the working screen of the detection personnel in real time. If the residual liquid pressure exceeds the threshold, the methanol concentration exceeds the standard, or there is residual liquid adhesion, at this time, the visualization perception module transmits the data to the intelligent control module, and the intelligent control module issues a purging instruction to control the purging module to perform purging. The purging module first performs water pump purging; if methanol residual liquid is found near the electric control valve 12 through the high-definition camera 8, the valve purging gun 10 is simultaneously opened for purging;

[0058] At this time, the electric control valve 12 controls the valve purging gun 10 to connect to the water storage tank 2, and the valve purging gun 10 purges the vicinity of the electric control valve 12 by pumping water;

[0059] S3 After the water pump purging is completed, the intelligent control module controls the purging module to perform nitrogen purging and calculates the nitrogen purging time;

[0060] S4 First calculate the initial nitrogen purging time: Based on the total volume Q of the methanol pipeline 9, the average velocity v of the purging port, and the area A of the purging port, calculate the initial purging time And start the purging module to perform initial purging;

[0061] S5 Dynamically adjust the purging time: After the initial purging time ends, evaluate the purging effect based on the feedback data of the visual perception module. If the residual liquid pressure does not drop to the threshold, the methanol concentration exceeds the standard, or there is residual liquid adhesion, extend the purging time to the total time t2, and calculate the safety factor The final purging time is adjusted to At the same time, control the total nitrogen consumption V < 3.0×Q;

[0062] S6 Optimize the purging mode: When the methanol concentration in a local area cannot be reduced, switch the basic purging method to the flow field disturbance purging method, and use intermittent purging or simple harmonic purging.

[0063] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "set", "connected", "fixed", "swiveling connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the technology or knowledge in related fields. And the changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. A methanol ship intelligent purge system based on digital twin, characterized by: It includes a visual perception module, an intelligent control module and a purge module; the visual perception module includes a pressure sensor, a methanol sensor and a high-definition camera. The pressure sensor is arranged on the wall of the methanol pipeline and is used to detect the residual liquid pressure in the methanol pipeline. The methanol sensor is arranged inside the methanol pipeline and is used to detect the methanol concentration in the methanol pipeline. The high-definition camera is arranged on the wall of the methanol pipeline and is used to record the distribution of residual liquid in the methanol pipeline. The purge module includes a water pump purge and a nitrogen purge. The water pump purge is to pump water into the methanol pipeline for purge, and the nitrogen purge is to transport nitrogen to the methanol pipeline for purge. The intelligent control module sends a purge instruction to control the purge module to perform purge, the purge module first performs water pump purge, and then performs nitrogen purge after the water pump purge is completed; The steps for the intelligent control module to obtain the nitrogen purge time are as follows: (1) Obtain the initial purge time. The calculation formula for the initial purge time is: Where Q is the total volume of the methanol pipeline, v is the average velocity of the purge port, A is the area of the purge port, t1 is the initial purge time, and the initial purge time is the theoretical purge time; (2) After the initial purge time, the data from the pressure sensor, methanol sensor, and high-definition camera are used for evaluation; (3) If the evaluation result does not meet the purging effect, the purging time is increased until it meets the requirement. At this time, the total time used for nitrogen purging is the actual purging time; (4) Establish the safety factor. The formula for the safety factor is: Where, t1 is the theoretical purge time, t2 is the actual purge time, and c is the safety factor; (5) The calculation formula for obtaining the nitrogen purge time is: Where t is the nitrogen purge time, c is the safety factor, Q is the total volume of the methanol pipeline, v is the average velocity at the purge port, and A is the purge port area; In addition, ensure that the total nitrogen consumption V is less than 3.0×Q.

2. The methanol ship intelligent purge system based on digital twin according to claim 1 is characterized in that: The nitrogen purge mode includes a basic purge mode and a flow field disturbance purge mode; the basic purge mode is that nitrogen flows continuously and uninterruptedly to purge the methanol pipeline at a constant speed or pressure until the predetermined purge time is completed; the flow field disturbance purge mode is intermittent purge or simple harmonic wave purge; when the methanol concentration in the local area cannot be reduced, switch to the flow field disturbance purge mode for nitrogen purge.

3. The methanol ship intelligent purge system based on digital twin according to claim 1 is characterized in that: The purge module also includes valve purge. The water pump purge is to pump water in the water storage tank into the methanol pipeline for purge. The nitrogen purge is to transport nitrogen in the nitrogen tank to the methanol pipeline for purge. The water storage tank and the nitrogen tank are both connected to the methanol pipeline through a delivery pipe. An electric control valve is set at the connection between the methanol pipeline and the delivery pipe. A water pump is set on the delivery pipe between the electric control valve and the water storage tank; the valve purge is carried out by a valve purge gun set on the inner wall of the methanol pipeline. The valve purge gun is connected to the water storage tank and is close to the electric control valve.

4. The methanol ship intelligent purge system based on digital twin according to claim 1 is characterized in that: The visual perception module further includes a liquid level detector, which is arranged inside a collector connected to the methanol pipeline, and the collector is used to collect the purged methanol waste liquid.

5. A purging method using the methanol ship intelligent purging system based on digital twin according to any one of claims 1 to 4, characterized in that: The steps include: S1 monitors the status of the methanol pipeline in real time: through pressure sensors, methanol sensors and high-definition cameras, it obtains the residual liquid pressure, methanol concentration and residual liquid distribution images in the methanol pipeline in real time; The S2 visual perception module displays a three-dimensional spatial diagram of the methanol pipeline on the inspector's work screen in real time. If the residual liquid pressure exceeds the threshold, the methanol concentration exceeds the standard, or there is residual liquid adhesion, the visual perception module transmits the data to the intelligent control module, which issues a purge command to control the purge module to purge. The purge module first uses the water pump to purge. After the S3 water pump purge is completed, the intelligent control module controls the purge module to purge nitrogen and calculates the nitrogen purge time; S4 first calculates the initial purge time of nitrogen: Based on the total volume Q of the methanol pipeline, the average velocity v of the purge port and the purge port area A, the initial purge time is calculated. And start the purge module to perform initial purge; S5 dynamically adjusts the purge time: After the initial purge time is over, the purge effect is evaluated based on the feedback data from the visual perception module. If the residual liquid pressure does not drop to the threshold, the methanol concentration exceeds the standard, or there is residual liquid adhesion, the purge time is extended to the total time t2, and the safety factor is calculated. The final purge time is adjusted to At the same time, control the total nitrogen consumption V<3.0×Q; S6 optimized purge mode: When the methanol concentration in the local area cannot be reduced, the basic purge mode is switched to the flow field disturbance purge mode, using intermittent purge or simple harmonic wave purge.

6. The intelligent purging method for a methanol ship based on digital twin according to claim 5 is characterized in that: In step S2, if the high-definition camera detects the presence of residual methanol near the electronically controlled valve, the valve purge gun is simultaneously opened for purge.

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