Method and system for detecting pressure of low-temperature storage tank perlite on inner tank wall plate

Abstract

The invention discloses a method and system for detecting the pressure of low-temperature storage tank perlite on an inner tank wall plate. The method comprises the steps that an open container is arranged to simulate the outer wall of a storage tank annular space; a sliding plate is arranged at the opening of the container to seal the container to simulate the inner wall; filling the container with a material to be detected according to a preset requirement, and acquiring first pressure data when the container is initially filled and second pressure data after the material is tamped and supplemented through a plurality of pressure sensors arranged on a sliding plate; controlling a pressure source to apply corresponding working condition pressure to the sliding plate according to a preset working condition; acquiring third pressure data in a stable state through a pressure sensor; and summarizing the first pressure data, the second pressure data, the third pressure data and the height corresponding to each pressure sensor, and performing contrast analysis with a theoretical calculation result. The problem that the dynamic pressure of the internal material of the storage tank annular space is difficult to detect through experimental means is solved. And various types of granular mixtures are used, so that the application range is widened.

Description

Technical Field

[0001] The invention relates to the technical field of storage tank pressure detection, and in particular to a method and system for detecting the pressure of perlite on an inner tank wall plate of a low-temperature storage tank. Background Art

[0002] As a high-quality clean energy, liquefied natural gas (LNG) has been increasingly in demand as the national economy develops, and has gradually become an important energy industry in the country. Among them, LNG storage is a very important link in the LNG industry, and its storage method is usually selected based on capacity, cost, safety, and construction environment.

[0003] At present, the most commonly used and technologically mature one in China is the full-containment prestressed concrete storage tank. The LNG storage tank has strict insulation measures, including cold insulation of the tank bottom, tank wall and tank top, among which expanded perlite is the key insulation material and is filled in the annular space of the tank. The annular space is located between the prestressed reinforced concrete outer tank and the 9% Ni steel plate of the inner tank of the storage tank. A layer of elastic felt is laid on the outside of the inner tank wall, and the other space of the inner wall insulation layer is filled with expanded perlite. Expanded perlite and elastic felt are the main insulation materials between the inner tank wall and the outer tank wall of the LNG full-containment storage tank, which have an important influence on the overall structural stress of the tank. Therefore, a technical problem that urgently needs to be solved in the design and construction technology of the fully contained LNG storage tank regarding the pressure test of the inner tank wall by perlite is: how to find a simple, fast and accurate method for testing the side pressure of the inner tank wall. Summary of the invention

[0004] The embodiment of the present invention provides a method and system for detecting the pressure of perlite on the inner tank wall plate of a cryogenic storage tank, which at least partially solves the technical problem that the lateral pressure distribution of the expanded perlite on the inner tank wall plate cannot be detected during the annular expansion of the double-wall cryogenic storage tank in the prior art. The lateral pressure generated by the expanded perlite on the inner tank wall plate is simulated by the working condition, thereby achieving the technical effect of accurate detection of the lateral pressure and simple operation.

[0005] In the first aspect, to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0006] A method for detecting the pressure of perlite on the inner tank wall of a low-temperature storage tank comprises setting an open container to simulate the outer wall of the annular gap of the storage tank; setting a sliding plate at the opening of the container to close the container to simulate the inner wall; the method comprises:

[0007] Fill the material to be tested into the container according to preset requirements, and obtain the first pressure data when the container is initially filled and the second pressure data after tamping the supplementary material through the multiple pressure sensors set on the sliding plate; control the pressure source to apply the corresponding working pressure to the sliding plate according to the preset working condition; obtain the third pressure data in a stable state through the pressure sensor; summarize the first pressure data, the second pressure data, the third pressure data and the height corresponding to each of the pressure sensors, and compare and analyze them with the theoretical calculation results. Use the sliding plate to simulate the inner wall of the storage tank, apply pressure to the sliding plate through the pressure source to simulate the expansion of the storage tank, and then obtain pressure data at different times based on the pressure sensor, thereby obtaining the pressure of the material to be tested on the inner wall of the storage tank during the expansion of the storage tank.

[0008] Optionally, the step of obtaining the third pressure data in a stable state specifically includes:

[0009] After the pressure under the above working conditions is maintained for the first time, it is left to stand for the second time; the data of the pressure sensor is recorded at preset time intervals, and when the pressure difference between the two previous and subsequent records does not exceed the preset threshold, it is judged to be stable; the above third pressure data in a stable state is recorded. After standing still, the force exerted by the material to be tested on the sliding plate reaches a stable state, and the stable state can reflect the force that the storage tank continues to be subjected to after expansion in actual working conditions, thereby providing a strong reference for pressure data analysis.

[0010] Optionally, after obtaining the third pressure data in a stable state, the method further includes:

[0011] Replace the material to be tested filled in the container; cycle all the steps in claim 1 according to the new preset working conditions until all preset working conditions are completed. In actual applications, there is more than one working condition, so a cyclic method is used to test the working conditions to be tested one by one to improve convenience.

[0012] Optionally, the step of filling the container with the material to be tested according to preset requirements specifically includes:

[0013] Fill the container with the material to be tested, and record the corresponding first pressure data and the first filler weight through the pressure sensor; vibrate the sliding plate to tamp the perlite, and record the height change of the perlite after tamping; fill the container with the material to be tested again, and record the second filler weight; after standing for a second time, obtain the second pressure data in a stable state through the pressure sensor. This embodiment is a specific operation of container filling, and the recorded first pressure data and second pressure data are mainly for detecting the corresponding pressure values ​​of different filling amounts for reference and analysis. The recorded first filler weight and second filler weight can reflect the pressure of different amounts of the material to be tested on the storage tank when the storage tank is not expanded.

[0014] Optionally, before the container is filled with the material to be tested, the method further includes: after installing an elastic felt on the side of the sliding plate facing the outer wall, obtaining fourth pressure data at this time through multiple pressure sensors arranged on the sliding plate; and subtracting the influence of the fourth pressure data from the first pressure data, the second pressure data and the third pressure data to obtain corresponding actual pressure data. This is equivalent to eliminating the influence of the elastic felt on the pressure of the sliding plate, so that the detected data can more accurately reflect the pressure influence of the material to be tested on the sliding plate.

[0015] Optionally, the step of acquiring the second pressure data in a stable state through the pressure sensor specifically includes:

[0016] The data of the pressure sensor is recorded at preset time intervals. When the pressure difference between the two previous and subsequent records does not exceed a preset threshold, it is determined to be stable; and the above-mentioned second pressure data in a stable state is recorded.

[0017] Optionally, the step of recording the height change of the perlite after compaction further comprises:

[0018] A distance sensor is arranged at the top of the container to obtain height change data of the perlite after compaction.

[0019] Optionally, the above method further includes:

[0020] A weight sensor is arranged at the bottom of the container, and the weight of the first filler and the weight of the second filler are obtained through the weight sensor.

[0021] In a second aspect, a detection system for the pressure of perlite on the inner tank wall of a low-temperature storage tank is provided, comprising: setting an open container to simulate the outer wall of the annular gap of the above-mentioned storage tank; setting a sliding plate at the opening of the above-mentioned container to close the above-mentioned container to simulate the inner wall;

[0022] The above system includes:

[0023] A filling module, used to fill the material to be tested into the container according to preset requirements, and obtain the first pressure data when the container is initially filled and the second pressure data after the material is tamped through the multiple pressure sensors arranged on the sliding plate;

[0024] A tank expansion simulation module, used to control the pressure source to apply corresponding working pressure to the sliding plate according to the preset working condition;

[0025] An expansion pressure acquisition module, which acquires third pressure data in a stable state through the pressure sensor;

[0026] The analysis module is used to summarize the first pressure data, the second pressure data, the third pressure data and the height corresponding to each of the pressure sensors, and compare and analyze them with theoretical calculation results.

[0027] Based on these modules, automated control is carried out to make detection more convenient and reduce the workload of operators.

[0028] Optionally, the above analysis module also includes:

[0029] Enter the first pressure data, the second pressure data, the third pressure data and the height corresponding to each of the pressure sensors into a preset chart to generate a corresponding statistical chart;

[0030] Enter the theoretical calculation results into the above statistical chart to obtain a comparison chart.

[0031] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0032] In the present invention, a container is set up to simulate the inner wall, outer wall and annular gap of the tank, wherein a sliding plate is used to simulate the expansion of the inner wall of the tank, and the expansion degree is controlled by a power source to simulate different working conditions, and pressure data is acquired based on the pressure sensor on the sliding plate. The problem that it is difficult to detect the dynamic pressure of the internal material in a closed cavity by experimental means is overcome. In addition to being applied to the lateral pressure detection of expanded perlite, the material to be tested can also be used to perform lateral pressure detection on other types of granular bodies, making it widely applicable. In the whole method, the acquisition of data can be automated, making the operation easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A flow chart of a method for detecting the pressure of perlite on the inner tank wall of a low-temperature storage tank provided by the present invention;

[0035] Figure 2 It is a structural schematic diagram of the simulation device in the present invention;

[0036] Figure 3 It is a schematic diagram of the side pressure of each measuring point in different states of working condition A in the present invention;

[0037] Figure 4 Schematic diagram of the change of the pressure along the height at each measuring point under working condition A in the present invention;

[0038] Figure 5 This is a schematic diagram of the average pressure at each measuring point during the experimental preparation and process of working condition A in the present invention;

[0039] Figure 6 Schematic diagram of the variation of the average pressure along the height at each measuring point in working condition A of the present invention;

[0040] Figure 7 It is a schematic diagram comparing the maximum pressure values ​​of each measuring point in working condition A in the present invention with the theoretical calculation results.

[0041] Figure numerals: 1. sliding plate; 2. outer wall; 3. perlite; 4. elastic felt; 5. reaction frame; 6. servo actuator; 7. pressure sensor; 8. servo controller; 9. terminal. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations of the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0047] The technical solution of the embodiment of the present invention is to solve the above technical problems, and the overall idea is as follows:

[0048] A container is set up to simulate the inner wall, outer wall 2 and annular gap of the tank, wherein the sliding plate 1 is used to simulate the expansion of the inner wall of the tank. The expansion degree is controlled by a power source to simulate different working conditions, and pressure data is acquired based on the pressure sensor 7 on the sliding plate 1.

[0049] In an embodiment of the present invention, there is provided Figure 1 The method for detecting the pressure of perlite 3 on the inner tank wall of a low-temperature storage tank shown includes setting an open container to simulate the outer wall 2 of the annular gap of the storage tank; and setting a sliding plate 1 at the opening of the container to close the container to simulate the inner wall.

[0050] It should be noted that the material of the container used for simulation is set according to the corresponding position of the tank. For example, the open container simulates the outer wall 2 of the tank, so the material of the open container and the outer wall 2 of the tank are set to be the same. The sliding plate 1 simulates the inner wall of the tank, so the sliding plate 1 and the inner wall of the tank are made of the same material. The space inside the container simulates the annular gap of the tank. The specific structure is as follows Figure 2 The detection method and device of the present invention are applicable to various granular materials, and this embodiment takes expanded perlite 3 as an example for explanation.

[0051] The specific steps of this method are as follows:

[0052] Step S101, hang and fix the elastic felt 4 on the sliding plate 1, and arrange a plurality of pressure sensors 7 along the height direction of the sliding plate 1, and record the fourth pressure data of each measuring point after the elastic felt 4 is fixed. The fourth pressure value can be regarded as the pressure of the hanging fixed elastic felt 4 on the sliding surface, and in the subsequent calculation, the fourth pressure data is subtracted to obtain the actual data.

[0053] Step S102, filling the container (i.e., the annular space) with expanded perlite 3, and after the initial filling, recording the first pressure data and the first filler weight of each measuring point;

[0054] Step S103, vibrating the sliding plate 1 to tamp and fill the expanded perlite 3. Record the sedimentation of the perlite 3, the weight of the second filler and the second pressure data. It should be noted that the use of vibration to tamp the expanded perlite 3 is mainly to use the friction and adhesion generated by the vibration transmitted to the surface of the particles, so that the particles overcome gravity and close to each other, thereby achieving the purpose of tamping. This operation is to ensure that the expanded perlite 3 reaches the maximum filling state. In addition, for the vibration operation, a vibration table, a servo actuator and other equipment can be used.

[0055] Step S104, let it stand for a second time, record the pressure data of each measuring point, and then record the pressure data of each measuring point at a preset time interval, at least three times, until the difference between the two recorded pressure values ​​does not exceed the threshold value, which is stable, and the pressure data at this time is the second pressure data. Then start the next test step.

[0056] Step S105, start simulating the expansion test of the storage tank, that is, applying pressure to the sliding plate 1 through a pressure source, thereby simulating the state of the expansion of the storage tank. Specifically, the stroke of the sliding plate 1 to be tested is set according to the actual expansion condition of the storage tank. And maintain the pressure for a period of time. It should be noted that the pressure source can be a device capable of applying thrust, such as a hydraulic cylinder, a servo actuator, etc.

[0057] Step S106, after standing for a second time, record the pressure data of each measuring point, and then record the pressure data of each measuring point at a preset time interval, at least three times, until the pressure difference between the two recorded pressure values ​​does not exceed the threshold value, which is stable, and the pressure data at this time is the third pressure data. Then start the next test step.

[0058] Step S107, recording and analyzing the data obtained from the above detection, and then starting the next cycle, replacing the filled material, and conducting experiments under other groups of working conditions.

[0059] In the present invention, the simulation device for the annular gap of the storage tank controls the expansion degree through a power source to simulate different working conditions, and the pressure data is acquired based on the pressure sensor 7 on the sliding plate 1. The problem that it is difficult to detect the dynamic pressure of the internal material in a closed cavity by experimental means is solved. In addition, in addition to the lateral pressure detection of the expanded perlite 3, the material to be tested can also be used to perform lateral pressure detection on other types of granular bodies, making the application range wide. In the whole method, the acquisition of data can be automated, making the operation simple.

[0060] Embodiment 1:

[0061] When testing small batches of working condition data, automatic equipment combined with manual assistance can be used. Based on the above simulation device, the details are as follows:

[0062] Step S101, the elastic felt 4 is hung and fixed on the sliding plate 1, and 8 pressure sensors 7 are arranged along the height direction of the sliding plate 1. After the elastic felt 4 is fixed, the fourth pressure data of the 8 measuring points are recorded through the terminal 9 connected to the pressure sensor 7. The terminal 9 can be a device with intelligent processing such as a PC or a tablet computer.

[0063] Step S102, fill the expanded perlite 3 in the container. After the initial filling, the terminal 9 records the first pressure data of the eight measuring points through the pressure sensor 7. As for the first filling weight, since containers with equal weight are used during filling, the first filling weight is obtained according to the number of times the container is used, and it is recorded on the terminal 9.

[0064] Step S103, control the vibration equipment to vibrate the sliding plate 1, so as to compact and fill the perlite 3. The vibration frequency is 1 to 10 Hz, the amplitude is 1 to 3 mm, and the first vibration is 2000 times. The perlite 3 settlement (i.e., height change data) is obtained through the entrance depth measuring ruler, and it is recorded on the terminal 9. The second filler weight is obtained in the same way as the first filler weight. Then the same frequency and amplitude are used to vibrate 1000 times, and the vibration is completed. It should be noted that the servo actuator 6 is used for the vibration equipment in this embodiment. Since the servo actuator 6 can perform different execution actions according to different programs, it can both apply pressure and vibrate, so the servo actuator 6 is used as both a vibration equipment and a pressure source. The actuator is fixed by the reaction frame 5.

[0065] Step S104, after standing for 5 minutes, the pressure data of the 8 measuring points are recorded again by the pressure sensor 7, and then the pressure values ​​of the 8 measuring points are recorded every 5 minutes, at least three times, until the difference between the two recorded pressure values ​​does not exceed 0.1N, which is stable. At this time, the stable pressure data is the second pressure data. Start the next test step.

[0066] Step S105, based on the servo controller 8, controls the servo actuator 6 to apply pressure to the sliding plate 1, thereby realizing a simulated tank expansion test, and the sliding plate 1 moves a distance to simulate the expansion stroke. The specific stroke size is executed according to the preset working condition. For example, working condition A is 4 layers of elastic felt, and the annular gap size is 1100mm. The experiment lasts for 30 minutes. It should be noted that the servo controller 8 interacts with the terminal 9 for data. In addition to obtaining the parameters of the servo actuator 6, a new execution program can also be set for a new working condition.

[0067] Step S106, after standing for 5 minutes, the terminal 9 obtains the pressure values ​​of 8 measuring points through the pressure sensor 7, and then records the pressure values ​​of the 8 measuring points every 5 minutes, at least three times, until the pressure difference between the two recorded pressure values ​​does not exceed 0.1N, which is stable. The pressure data at this moment is the third pressure data, and the next test step starts.

[0068] Step S107, in response to the determination of the stable condition being passed, the terminal 9 records and analyzes the data, and then starts the next cycle, after replacing the filling material, repeating steps S101 to S107 until all the working condition data are tested.

[0069] Embodiment 2:

[0070] When testing a large number of working condition data, a fully automatic test method can be used, as follows:

[0071] Based on the same inventive concept, an embodiment of the present invention provides a detection system for the inner tank wall pressure of perlite 3 of a low-temperature storage tank. On the basis of adopting the above-mentioned simulation device, the system includes:

[0072] a. Loading module:

[0073] Step S101 : after the elastic felt 4 is fixed, the terminal 9 obtains fourth pressure data of eight measuring points through the pressure sensor 7 .

[0074] Step S102, after recording the fourth pressure value, in response to the first start signal sent by the terminal 9, the material transmission device injects the expanded perlite 3 into the container. The material transmission device can be a material conveyor belt, or a pneumatic hammer pump or a screw pump to extract the required material from the container where the expanded perlite 3 is placed.

[0075] The expanded perlite 3 in the container is measured by a distance sensor, and in response to a threshold height of the distance sensor (the threshold height is regarded as full), the container is judged to be filled for the first time, and the terminal 9 obtains the first pressure data of 8 measuring points through the pressure sensor 7. The terminal 9 obtains the first filler weight through a weight sensor arranged at the bottom of the container. Among them, the distance sensor adopts a laser sensor.

[0076] Step S103, after recording the first pressure data and the first filler weight, in response to the vibration start signal sent by the terminal 9, the servo controller 8 controls the servo actuator 6 to start vibrating, with a vibration frequency of 1 to 10 Hz, an amplitude of 1 to 3 mm, and 2000 vibrations for the first time; then the distance sensor measures the height data change of the perlite 3 and sends it to the terminal 9 for recording. After the recording is completed, the material transmission equipment is controlled to continue filling the material to the threshold height. After detecting the threshold height, the distance sensor triggers the weight sensor for secondary detection to obtain the second filler weight at this time. Then the servo actuator 6 is controlled to vibrate 1000 times with the same frequency and amplitude, and the vibration ends. The actuator is fixed by the reaction frame 5, which can be fixed on the ground or on the container.

[0077] Step S104, after standing for 5 minutes, the terminal 9 records the pressure values ​​of 8 measuring points through the pressure sensor 7, and then records the pressure values ​​of 8 measuring points every 5 minutes, at least three times, until the difference between the pressure values ​​recorded twice does not exceed 0.1N and is stable, and the terminal 9 obtains the second pressure data at this time.

[0078] b. Tank expansion simulation module;

[0079] Step S105, after the second pressure data is recorded, in response to the second start signal of the terminal 9, the servo controller 8 controls the servo actuator 6 to execute the simulated tank expansion procedure, that is, the servo controller 8 controls the servo actuator 6 to continuously apply pressure to the sliding plate 1 for 30 minutes. The magnitude of the applied pressure is mainly set according to the actual working conditions.

[0080] c. Expansion pressure acquisition module;

[0081] Step S106, after standing for 5 minutes, the terminal 9 records the pressure values ​​of the 8 measuring points through the pressure sensor 7, and then records the pressure values ​​of the 8 measuring points every 5 minutes, at least three times, until the pressure difference between the two recorded pressure values ​​does not exceed 0.1N, which is stable. The terminal 9 obtains the third pressure data at this time.

[0082] d. Analysis module;

[0083] Step S107, record the third pressure data, then analyze the above data and start the next cycle. After the third pressure data is recorded, the terminal 9 controls the electric control valve at the bottom of the container to open and unload the material of the previous experiment; at the same time, the distance sensor is triggered to monitor the height of the material in real time. If it is 0, the electric control valve is closed and steps S101 to S107 are repeated until all working condition data are tested.

[0084] Embodiment 3:

[0085] After obtaining the data, it is more intuitive to use charts for analysis, such as Figures 3 to 7 As shown, specifically, the first pressure data, the second pressure data, the third pressure data and the height corresponding to each of the pressure sensors 7 are entered into a preset chart to generate a corresponding statistical chart; the theoretical calculation results are entered into the statistical chart to obtain a comparison chart. This can verify the reliability of the theoretical calculation of the pressure on the side of the expanded perlite 3, and also provide reference-worthy original data for finite element numerical simulation, and provide theoretical and data support for the overall modeling of the LNG storage tank and the study of the pressure on the side of the overall expanded perlite 3. This enables the ability to quickly and accurately test the pressure on the inner tank wall of the annular gap of the double-walled cryogenic storage tank expanded perlite 3.

[0086] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0087] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0088] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for detecting the pressure of perlite on the inner tank wall of a low-temperature storage tank, characterized in that: The method comprises setting an open container to simulate the outer wall of the annular gap of the storage tank; setting a sliding plate at the opening of the container to close the container to simulate the inner wall; The method comprises: Fill the material to be tested into the container according to preset requirements, and obtain the first pressure data when the container is initially filled and the second pressure data after the material is tamped through the multiple pressure sensors arranged on the sliding plate; Controlling the pressure source to apply corresponding working pressure to the sliding plate according to the preset working condition; Acquiring third pressure data in a stable state through the pressure sensor; The first pressure data, the second pressure data, the third pressure data and the height corresponding to each of the pressure sensors are summarized and compared with theoretical calculation results for analysis.

2. The method according to claim 1, characterized in that The step of obtaining the third pressure data in a stable state specifically includes: After the working pressure is maintained for a first time, the working pressure is left to stand for a second time; The data of the pressure sensor is recorded at a preset time interval. When the pressure difference between the two previous and subsequent records does not exceed the preset threshold, it is judged to be stable; The third pressure data in a stable state is recorded.

3. The method according to claim 1, characterized in that After acquiring the third pressure data in a stable state, the method further includes: Replacing the material to be tested filled into the container; All steps in claim 1 are cycled according to the new preset operating conditions until all preset operating conditions are completed.

4. The method according to claim 1, characterized in that The step of filling the container with the material to be tested according to preset requirements specifically includes: Filling the container with the material to be tested, and recording the corresponding first pressure data and the first filling weight through the pressure sensor; vibrating the sliding plate to compact the perlite, and recording a change in height of the perlite after compaction; Fill the container with the material to be tested again, and record the weight of the second filled material; After standing still for a second time, second pressure data in a stable state is acquired through the pressure sensor.

5. The method according to claim 4, characterized in that Before the container is filled with the material to be tested, the method further comprises: After the elastic felt is installed on the side of the sliding plate facing the outer wall, the fourth pressure data at this time is obtained through a plurality of pressure sensors arranged on the sliding plate; The influence of the fourth pressure data is subtracted from the first pressure data, the second pressure data and the third pressure data to obtain corresponding actual pressure data.

6. The method according to claim 4, characterized in that The step of acquiring the second pressure data in a stable state through the pressure sensor specifically includes: The data of the pressure sensor is recorded at a preset time interval. When the pressure difference between the two previous and subsequent records does not exceed the preset threshold, it is judged to be stable; The second pressure data in a stable state is recorded.

7. The method according to claim 4, characterized in that The step of recording the height change of the perlite after compaction also includes: A distance sensor is arranged at the top of the container to obtain height change data of the perlite after compaction.

8. The method according to claim 4, characterized in that The method further comprises: A weight sensor is arranged at the bottom of the container, and the weight of the first filler and the weight of the second filler are obtained by the weight sensor.

9. A detection system for the pressure of perlite on the inner tank wall of a cryogenic storage tank, characterized in that: The method comprises setting an open container to simulate the outer wall of the annular gap of the storage tank; setting a sliding plate at the opening of the container to close the container to simulate the inner wall; The system comprises: A filling module, used to fill the material to be tested into the container according to preset requirements, and obtain the first pressure data when the container is initially filled and the second pressure data after the material is tamped through a plurality of pressure sensors arranged on the sliding plate; A tank expansion simulation module, used to control the pressure source to apply a corresponding working pressure to the sliding plate according to a preset working condition; an expansion pressure acquisition module, which acquires third pressure data in a stable state through the pressure sensor; The analysis module is used to summarize the first pressure data, the second pressure data, the third pressure data and the height corresponding to each pressure sensor, and compare and analyze them with theoretical calculation results.

10. The system according to claim 9, characterized in that The analysis module also includes: Enter the first pressure data, the second pressure data, the third pressure data and the height corresponding to each of the pressure sensors into a preset chart to generate a corresponding statistical chart; The theoretical calculation results are entered into the statistical chart to obtain a comparison chart.

11. The system according to claim 9, characterized in that The filling module also includes using a vibration device to tamp the material in the container; The vibration device and the pressure source use the same servo actuator, and in response to a first start signal from a terminal, the servo actuator performs a vibration operation according to a preset current and speed; In response to a first start signal from the terminal, the servo actuator drives the sliding plate according to a preset pressure.

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