Piston gas tank piston offset monitoring system and method

Abstract

The present invention belongs to the field of intelligent monitoring technology and discloses a piston offset monitoring system and method for piston-type gasholders. The system includes two rangefinders, a temperature sensor, a pressure sensor, a PLC controller, and a host computer. The outputs of the two rangefinders, the temperature sensor, and the pressure sensor are respectively connected to the inputs of the PLC controller, which is connected to the host computer via Ethernet. The two rangefinders are mounted circumferentially on the upper surface of the piston and are used to measure the distance between the outer edge of the piston and the side panels of the gasholder body. The two rangefinders are at the same height and the angle between them is 90 degrees. The temperature sensor is used to measure the ambient temperature within the gasholder, and the pressure sensor is used to measure the gas pressure within the piston. The present invention provides a reliable guarantee for the safe production and operation of the gasholder, reduces maintenance costs and safety risks, and effectively avoids safety accidents such as piston crashes. The present invention is suitable for the safety monitoring of piston-type gasholders.

Description

Technical Field

[0001] The invention belongs to the technical field of intelligent monitoring and relates to a system and method for monitoring the piston offset of a piston-type gas cabinet. Background Art

[0002] Piston gasholders are a crucial piece of equipment in steel production, used for gas storage, gas pipeline regulation, and gas storage and pressure regulating equipment at distribution stations. Piston gasholders store, stabilize, and mix gas recovered from converters, offering advantages such as high throughput, minimal routine maintenance and overhaul, and a long service life. However, the long-term operation of piston gasholders can lead to aging of the membrane and subsidence of the foundation, which can cause piston offset. Furthermore, uneven force during piston movement can also cause piston offset. Once piston offset occurs, the sealing membrane can be torn, damaging the cabinet. In severe cases, this can lead to gas leaks, threatening personnel and production safety. Therefore, detecting piston offset in gasholders is an integral part of safe production.

[0003] For example, Chinese invention patent CN111664817B discloses a system for measuring the horizontal gap between a gas tank and a piston and side plate. The system includes a horizontal gap measuring device and a piston tilt measuring device connected to the gas tank control center. The horizontal gap measuring device includes a plurality of horizontal gap measuring units evenly distributed along the semicircumference of the piston. The horizontal gap measuring device measures the horizontal gap between the piston and the side plate of the cylinder and transmits the horizontal gap data to the gas tank control center. The piston tilt measuring device measures the inclination of the piston relative to the horizontal plane and transmits the inclination data to the gas tank control center. The control center determines the impact of the inclination on the horizontal gap and compares the horizontal gap after deducting the inclination effect with the standard gap. When the standard gap is exceeded, the control center issues an alarm signal. Although this measuring device can measure the horizontal gap and inclination of the piston, it requires a large number of horizontal gap measuring units and piston tilt measuring devices installed in different locations. The multi-point installation is labor-intensive and requires many calibration points, resulting in high investment costs and increased subsequent maintenance workload. Therefore, it is necessary to propose a new piston offset monitoring system for piston gas tanks to improve production safety and economic efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a piston offset monitoring system for a piston-type gas tank. The system uses two distance meters to measure the distance between the outer edge of the piston and the side panel of the gas tank body, and uses a temperature sensor and a pressure sensor to measure the ambient temperature inside the gas tank and the gas pressure inside the piston to perform environmental compensation. The system corrects measurement errors in real time, has a simple structure, and reduces equipment cost and maintenance complexity.

[0005] Another object of the present invention is to provide a method for monitoring piston offset of a piston-type gas tank.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0007] A piston gas tank piston offset monitoring system includes two distance meters, a temperature sensor, a pressure sensor, a PLC controller and a host computer; wherein,

[0008] The output terminals of the two rangefinders, temperature sensor, and pressure sensor are connected to the input terminals of the PLC controller respectively, and the PLC controller is connected to the host computer via Ethernet;

[0009] Two distance meters are installed on the circumference of the upper surface of the piston to measure the distance between the outer edge of the piston and the side panel of the gas tank body. The two distance meters are at the same height and the angle between them is 90 degrees.

[0010] The temperature sensor is installed on the upper surface of the piston and is used to measure the ambient temperature inside the gas tank;

[0011] A pressure sensor is installed on the inlet pipe or outlet pipe communicating with the interior of the piston and is used to measure the gas pressure in the piston;

[0012] The PLC controller is configured to receive the distance between the outer edge of the piston and the side panel of the gas tank body measured by the two distance meters, the ambient temperature inside the gas tank measured by the temperature sensor, and the gas pressure inside the piston measured by the pressure sensor; calculate an environmental compensation amount based on the ambient temperature inside the gas tank and the gas pressure inside the piston; calculate the piston offset distance and piston offset angle using an offset analysis algorithm based on the environmental compensation amount and the distance between the outer edge of the piston and the side panel of the gas tank body measured by the two distance meters, and transmit the environmental compensation amount, piston offset distance, and piston offset angle to a host computer;

[0013] The host computer is used to display and record the environmental compensation amount, piston offset distance and piston offset angle in real time. According to the set piston offset distance graded alarm threshold, when the piston offset distance exceeds the piston offset distance graded alarm threshold, an alarm signal of the corresponding level is issued.

[0014] As a limitation, the formula for the environmental compensation amount is:

[0015]

[0016] in, is the temperature deformation coefficient, The ambient temperature inside the gas cabinet is measured in real time by the temperature sensor. is the reference temperature for the initial calibration of the temperature sensor. is the pressure deformation coefficient, The gas pressure inside the piston is measured in real time by the pressure sensor. This is the reference pressure for the initial calibration of the pressure sensor.

[0017] As a second limitation, in the offset analysis algorithm, the formula for the offset component of the first rangefinder is:

[0018]

[0019]

[0020] in, is the offset component of the first rangefinder, is the distance from the piston origin to the side panel of the gas tank body, is the initial reference value of the first rangefinder, is the radius of the piston, is the environmental compensation amount, The distance between the outer edge of the piston and the side panel of the gas tank measured for the first distance meter;

[0021] The formula for the offset component of the second rangefinder is:

[0022]

[0023]

[0024] in, is the offset component of the second rangefinder, is the initial reference value of the second rangefinder, The distance between the outer edge of the piston and the side panel of the gas tank measured by the second distance meter;

[0025] The formula for the total offset vector synthesis is:

[0026]

[0027]

[0028] in, is the piston offset distance, is the piston offset angle.

[0029] As a third limitation, it also includes an audible and visual alarm, the input end of the audible and visual alarm is connected to the output end of the host computer, and the audible and visual alarm is used to issue a corresponding audible and visual alarm after receiving an alarm signal from the host computer.

[0030] As a fourth limitation, the rangefinder is a laser rangefinder.

[0031] As a fifth limitation, the PLC controller adopts Siemens S7-300 PLC controller.

[0032] As a sixth limitation, the host computer is a WinCC host computer.

[0033] The present invention also provides a method for monitoring piston offset of a piston-type gas holder, which uses the above-mentioned piston offset monitoring system of a piston-type gas holder, and includes the following steps:

[0034] S1. Install two rangefinders on the circumference of the upper surface of the piston, with the two rangefinders at the same height and at an angle of 90°, and determine the initial reference values of the two rangefinders; install a temperature sensor on the upper surface of the piston, and install a pressure sensor on the inlet pipe or outlet pipe communicating with the piston;

[0035] S2. Use two distance meters to measure the distance between the outer edge of the piston and the side panel of the gas cabinet in real time and send it to the PLC controller. Use a temperature sensor to measure the ambient temperature inside the gas cabinet and send it to the PLC controller. Use a pressure sensor to measure the gas pressure inside the piston and send it to the PLC controller.

[0036] S3. The PLC controller receives the distance between the outer edge of the piston and the side panel of the gas tank measured by the two distance meters, the ambient temperature inside the gas tank measured by the temperature sensor, and the gas pressure inside the piston measured by the pressure sensor. The controller calculates an environmental compensation amount based on the ambient temperature inside the gas tank and the gas pressure inside the piston. The controller calculates the piston offset distance and piston offset angle using an offset analysis algorithm based on the environmental compensation amount and the distance between the outer edge of the piston and the side panel of the gas tank measured by the two distance meters. The controller then sends the environmental compensation amount, piston offset distance, and piston offset angle to the host computer.

[0037] S4. After receiving the environmental compensation amount, piston offset distance and piston offset angle, the host computer displays and records them in real time. According to the set piston offset distance graded alarm threshold, when the piston offset distance exceeds the piston offset distance graded alarm threshold, an alarm signal of the corresponding level is issued.

[0038] As a limitation, it also includes sound and light alarms;

[0039] In step S4, the host computer sends an alarm signal of a corresponding level to the sound and light alarm, and the sound and light alarm sends a corresponding sound and light alarm after receiving the alarm signal.

[0040] Due to the adoption of the above technical solution, the present invention has achieved the following technical advancements compared with the prior art:

[0041] (1) The piston offset monitoring system of the piston type gas tank of the present invention comprises two distance meters, a temperature sensor, a pressure sensor, a PLC controller and a host computer; wherein the two distance meters are installed on the circumference of the upper surface of the piston, and are used to measure the distance between the outer edge of the piston and the side panel of the gas tank cabinet. The two distance meters are of the same height and the angle between the two distance meters is 90°. The temperature sensor is used to measure the ambient temperature in the gas tank, and the pressure sensor is used to measure the gas pressure in the piston. After receiving the data from the two distance meters, the temperature sensor and the pressure sensor, the PLC controller calculates the environmental compensation amount, and uses the offset analysis algorithm to calculate the piston offset distance and the piston offset angle, and then calculates the piston offset distance and the piston offset angle through the PLC controller. The host computer displays and records the information in real time, and an alarm signal is issued when the piston offset distance exceeds the piston offset distance classification alarm threshold. The present invention only uses two rangefinders to cover the monitoring of the piston circumferential offset. Compared with the existing technology, which requires the installation of a piston tilt measurement device and the arrangement of multiple horizontal spacing measurement units on the semicircle of the piston, the number of hardware is significantly reduced, and the equipment cost and maintenance complexity are reduced. By integrating temperature sensors and pressure sensors, the environmental parameters in the gas tank can be monitored in real time. Environmental factors (such as thermal expansion and air pressure deformation) are dynamically compensated in the offset analysis algorithm, reducing the source of error, enhancing the accuracy of offset calculation, and realizing 360° omnidirectional offset analysis.

[0042] (2) The piston offset monitoring method of the piston-type gas tank of the present invention can enable the gas tank operator to timely and accurately understand the safety status of the gas tank piston, provide a reliable guarantee for the safe production and operation of the gas tank, reduce the workload of personnel, and effectively avoid safety accidents such as piston crashing and gas explosion.

[0043] In summary, the present invention provides a reliable guarantee for the safe production and operation of gas tanks, reduces maintenance costs and safety risks, and effectively avoids safety accidents such as piston crashes. The present invention is applicable to the safety monitoring of piston-type gas tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 FIG2 is a block diagram of the structure of Embodiment 1 of the present invention;

[0045] Figure 2 Shown is a flow chart of the method of embodiment 2 of the present invention;

[0046] Figure 3 FIG. 1 is a plan view of the layout of two rangefinders in Example 2 of the present invention.

[0047] In the figure: 1. Piston; 2. Side panel of the gas tank body; 3. First distance meter; 4. Second distance meter; 5. Theoretical center origin of the gas tank and piston. DETAILED DESCRIPTION

[0048] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0049] Example 1 A Piston-Type Gas Tank Piston Offset Monitoring System

[0050] like Figure 1 As shown, this embodiment is a piston offset monitoring system for a piston-type gas tank, including two rangefinders, a temperature sensor, a pressure sensor, a PLC controller, an audible and visual alarm, and a host computer; the output ends of the two rangefinders, the temperature sensor, and the pressure sensor are respectively connected to the input ends of the PLC controller, the PLC controller is connected to the host computer via Ethernet, and the input end of the audible and visual alarm is connected to the output end of the host computer.

[0051] Two rangefinders are mounted circumferentially on the upper surface of piston 1 to measure the distance between the outer edge of piston 1 and the side panel 2 of the gas tank body. The two rangefinders are positioned at the same height and at a 90° angle. Laser rangefinders can be used.

[0052] The temperature sensor is installed on the upper surface of the piston 1 and is used to measure the ambient temperature inside the gas tank.

[0053] The pressure sensor is installed on the inlet pipe or the outlet pipe communicating with the interior of the piston 1 and is used to measure the gas pressure in the piston 1 .

[0054] The PLC controller is configured to receive the distance between the outer edge of piston 1 and the side panel 2 of the gas tank measured by two distance meters, the ambient temperature within the gas tank measured by a temperature sensor, and the gas pressure within piston 1 measured by a pressure sensor; calculate an environmental compensation value based on the ambient temperature within the gas tank and the gas pressure within piston 1; calculate the piston offset distance and piston offset angle using an offset analysis algorithm based on the environmental compensation value and the distance between the outer edge of piston 1 and the side panel 2 of the gas tank measured by the two distance meters, and transmit the environmental compensation value, piston offset distance, and piston offset angle to a host computer. The PLC controller can be a Siemens S7-300 PLC controller.

[0055] The host computer is used to display and record the environmental compensation amount, piston offset distance, and piston offset angle in real time. Based on the set piston offset distance graded alarm threshold, when the piston offset distance exceeds the piston offset distance graded alarm threshold, an alarm signal of the corresponding level is issued. The host computer can be a WinCC host computer.

[0056] The sound and light alarm is used to issue corresponding sound and light alarms after receiving the alarm signal from the host computer.

[0057] In this embodiment, the formula for the environmental compensation amount is:

[0058]

[0059] in, is the temperature deformation coefficient, unit is m / ℃, The ambient temperature inside the gas cabinet is measured in real time by the temperature sensor, in °C. The reference temperature for the initial calibration of the temperature sensor, in °C. is the pressure deformation coefficient, unit is m / MPa, The gas pressure in piston 1 is measured in real time by the pressure sensor, in MPa. It is the reference pressure during the initial calibration of the pressure sensor, in MPa. 、 It can be obtained directly from the gas tank cabinet material certificate without the need for on-site calibration.

[0060] In the offset analysis algorithm, the formula for the offset component of the first rangefinder 3 is:

[0061]

[0062]

[0063] in, is the offset component of the first rangefinder 3, in m, is the distance from the origin of piston 1 to the side panel 2 of the gas tank, in meters. is the initial reference value of the first rangefinder 3, in m, is the radius of piston 1, in m, is the environmental compensation amount, unit is m, The distance between the outer edge of the piston 1 and the side panel 2 of the gas tank body measured by the first distance meter 3, in meters. The ideal value is calculated by the above formula and can be calibrated on site in practice.

[0064] The formula for the offset component of the second rangefinder 4 is:

[0065]

[0066]

[0067] in, is the offset component of the second rangefinder 4, in m, is the initial reference value of the second rangefinder 4, in m, The distance between the outer edge of the piston 1 and the side panel 2 of the gas tank body measured by the second distance meter 4, in meters. The ideal value is calculated by the above formula and can be calibrated on site in practice.

[0068] The formula for the total offset vector synthesis is:

[0069]

[0070]

[0071] in, is the piston offset distance, in m, is the piston offset angle.

[0072] In this embodiment, only two rangefinders are used to monitor the circumferential offset of piston 1. By integrating temperature and pressure sensors, environmental parameters within the gas tank are monitored in real time. Dynamic compensation is performed in the offset analysis algorithm based on environmental factors (such as thermal expansion and pressure deformation), reducing sources of error and enhancing the accuracy of piston offset distance and angle calculations. The offset analysis algorithm incorporates the Pythagorean theorem to achieve 360° omnidirectional offset analysis.

[0073] Example 2 A method for monitoring piston offset of a piston-type gas cabinet

[0074] like Figure 2 As shown, this embodiment is a method for monitoring piston offset of a piston-type gas holder, which is implemented by using the piston offset monitoring system of the piston-type gas holder in Example 1 and includes the following steps:

[0075] S1. Install two rangefinders on the circumference of the upper surface of piston 1, with the two rangefinders at the same height and at an angle of 90°, and determine the initial reference values of the two rangefinders; install a temperature sensor on the upper surface of piston 1, and install a pressure sensor on the inlet pipe or outlet pipe communicating with the interior of piston 1;

[0076] S2. Use two distance meters to measure the distance between the outer edge of the piston 1 and the side panel 2 of the gas cabinet in real time and send it to the PLC controller. Use a temperature sensor to measure the ambient temperature inside the gas cabinet and send it to the PLC controller. Use a pressure sensor to measure the gas pressure inside the piston 1 and send it to the PLC controller.

[0077] S3. The PLC controller receives the distance between the outer edge of the piston 1 and the side panel 2 of the gas tank body measured by the two distance meters, the ambient temperature inside the gas tank measured by the temperature sensor, and the gas pressure inside the piston 1 measured by the pressure sensor. The controller calculates an environmental compensation amount based on the ambient temperature inside the gas tank and the gas pressure inside the piston 1. The controller calculates the piston offset distance and piston offset angle using an offset analysis algorithm based on the environmental compensation amount and the distance between the outer edge of the piston 1 and the side panel 2 of the gas tank body measured by the two distance meters. The controller then sends the environmental compensation amount, piston offset distance, and piston offset angle to the host computer.

[0078] S4. After receiving the environmental compensation amount, piston offset distance and piston offset angle, the upper computer displays and records them in real time. According to the set piston offset distance graded alarm threshold, when the piston offset distance exceeds the piston offset distance graded alarm threshold, an alarm signal of the corresponding level is sent to the sound and light alarm. After receiving the alarm signal, the sound and light alarm sends a corresponding sound and light alarm.

[0079] like Figure 3 To demonstrate the effectiveness of this embodiment, this embodiment was tested on a piston-type gas tank with a diameter of 50 m (R = 25 m). In this piston-type gas tank, the diameter of the piston 1 was 49 m (r = 24.5 m). Two rangefinders were installed on the upper surface of the piston 1 in the east and north directions, respectively. The rangefinder in the east direction served as the first rangefinder 3, and the rangefinder in the north direction served as the second rangefinder 4. The initial reference value of the first rangefinder 3 was determined. m, the initial reference value of the first rangefinder 3 m.

[0080] The upper computer is set with a piston offset distance graded alarm threshold, where the first-level threshold is: piston offset distance S>0.1m; the second-level threshold is: piston offset distance S>0.15m.

[0081] After the piston 1 has deviated for a period of time, the first distance meter 3 measures the distance between the outer edge of the piston 1 and the side panel 2 of the gas tank body. m, the distance between the outer edge of the piston 1 and the side panel 2 of the gas tank measured by the second distance meter 4 m.

[0082] The gas tank cabinet material certificate shows that the temperature deformation coefficient m / ℃, pressure deformation coefficient MPa. The ambient temperature inside the gas cabinet is measured in real time by the temperature sensor. The reference temperature for the initial calibration of the temperature sensor is 45°C. At 20°C, the gas pressure in piston 1 measured by the pressure sensor in real time is 0.25MPa, the reference pressure for the initial calibration of the pressure sensor It is 0.15MPa.

[0083] According to the ambient temperature in the gas tank and the gas pressure in piston 1, the environmental compensation amount is:

[0084] m.

[0085] The above data is calculated in the PLC controller using the offset analysis algorithm to obtain the due east offset component, that is, the offset component of the first rangefinder 3, as follows:

[0086] m;

[0087] The formula for the true north offset component, that is, the offset component of the second rangefinder 4, is:

[0088] m;

[0089] The formula for the total offset vector synthesis is:

[0090] m;

[0091] .

[0092] After the host computer receives the environmental compensation amount, piston offset distance and piston offset angle, it displays and records them in real time. According to the set piston offset distance graded alarm threshold, if the piston offset distance is greater than the secondary threshold of 0.15m, the host computer sends a secondary alarm signal to the sound and light alarm. After receiving the alarm signal, the sound and light alarm sends a corresponding sound and light alarm, such as a rapid sound and light alarm.

[0093] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still modify the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A piston-type gas tank piston offset monitoring system, characterized in that: It includes two distance meters, temperature sensor, pressure sensor, PLC controller and host computer; among them, The output terminals of the two rangefinders, temperature sensor, and pressure sensor are connected to the input terminals of the PLC controller respectively, and the PLC controller is connected to the host computer via Ethernet; Two distance meters are installed on the circumference of the upper surface of the piston to measure the distance between the outer edge of the piston and the side panel of the gas tank body. The two distance meters are at the same height and the angle between them is 90 degrees. The temperature sensor is installed on the upper surface of the piston and is used to measure the ambient temperature inside the gas tank; A pressure sensor is installed on the inlet pipe or outlet pipe communicating with the interior of the piston and is used to measure the gas pressure in the piston; The PLC controller is configured to receive the distance between the outer edge of the piston and the side panel of the gas tank body measured by the two distance meters, the ambient temperature inside the gas tank measured by the temperature sensor, and the gas pressure inside the piston measured by the pressure sensor; calculate an environmental compensation amount based on the ambient temperature inside the gas tank and the gas pressure inside the piston; calculate the piston offset distance and piston offset angle using an offset analysis algorithm based on the environmental compensation amount and the distance between the outer edge of the piston and the side panel of the gas tank body measured by the two distance meters, and transmit the environmental compensation amount, piston offset distance, and piston offset angle to a host computer; The upper computer is used to display and record the environmental compensation amount, piston offset distance and piston offset angle in real time. According to the set piston offset distance graded alarm threshold, when the piston offset distance exceeds the piston offset distance graded alarm threshold, an alarm signal of the corresponding level is issued; In the offset analysis algorithm, the formula for the offset component of the first rangefinder is: in, is the offset component of the first rangefinder, is the distance from the piston origin to the side panel of the gas tank body, is the initial reference value of the first rangefinder, is the radius of the piston, is the environmental compensation amount, The distance between the outer edge of the piston and the side panel of the gas tank measured for the first distance meter; The formula for the offset component of the second rangefinder is: in, is the offset component of the second rangefinder, is the initial reference value of the second rangefinder, The distance between the outer edge of the piston and the side panel of the gas tank measured by the second distance meter; The formula for the total offset vector synthesis is: in, is the piston offset distance, is the piston offset angle.

2. The piston offset monitoring system for a piston-type gas tank according to claim 1, characterized in that: The formula for the environmental compensation amount is: in, is the temperature deformation coefficient, The ambient temperature inside the gas cabinet is measured in real time by the temperature sensor. is the reference temperature for the initial calibration of the temperature sensor. is the pressure deformation coefficient, The gas pressure inside the piston is measured in real time by the pressure sensor. This is the reference pressure for the initial calibration of the pressure sensor.

3. The piston offset monitoring system for a piston-type gas tank according to claim 1 or 2, characterized in that: It also includes an audible and visual alarm, the input end of which is connected to the output end of the host computer. The audible and visual alarm is used to send out a corresponding audible and visual alarm after receiving an alarm signal from the host computer.

4. The piston offset monitoring system for a piston-type gas tank according to claim 1 or 2, characterized in that: The rangefinder is a laser rangefinder.

5. The piston offset monitoring system for a piston-type gas tank according to claim 1 or 2, characterized in that: The PLC controller adopts Siemens S7-300 PLC controller.

6. The piston offset monitoring system for a piston-type gas tank according to claim 1 or 2, characterized in that: The host computer is a WinCC host computer.

7. A method for monitoring piston offset of a piston-type gas tank, characterized in that: The piston offset monitoring system for a piston-type gas tank according to any one of claims 1 to 6 comprises the following steps: S1. Install two rangefinders on the circumference of the upper surface of the piston, with the two rangefinders at the same height and at an angle of 90°, and determine the initial reference values of the two rangefinders; install a temperature sensor on the upper surface of the piston, and install a pressure sensor on the inlet pipe or outlet pipe communicating with the piston; S2. Use two distance meters to measure the distance between the outer edge of the piston and the side panel of the gas cabinet in real time and send it to the PLC controller. Use a temperature sensor to measure the ambient temperature inside the gas cabinet and send it to the PLC controller. Use a pressure sensor to measure the gas pressure inside the piston and send it to the PLC controller. S3. The PLC controller receives the distance between the outer edge of the piston and the side panel of the gas tank measured by the two distance meters, the ambient temperature inside the gas tank measured by the temperature sensor, and the gas pressure inside the piston measured by the pressure sensor. The controller calculates an environmental compensation amount based on the ambient temperature inside the gas tank and the gas pressure inside the piston. The controller calculates the piston offset distance and piston offset angle using an offset analysis algorithm based on the environmental compensation amount and the distance between the outer edge of the piston and the side panel of the gas tank measured by the two distance meters. The controller then sends the environmental compensation amount, piston offset distance, and piston offset angle to the host computer. S4. After receiving the environmental compensation amount, piston offset distance and piston offset angle, the host computer displays and records them in real time. According to the set piston offset distance graded alarm threshold, when the piston offset distance exceeds the piston offset distance graded alarm threshold, an alarm signal of the corresponding level is issued.

8. The method for monitoring piston offset of a piston-type gas tank according to claim 7, characterized in that: Also includes sound and light alarms; In step S4, the host computer sends an alarm signal of a corresponding level to the sound and light alarm, and the sound and light alarm sends a corresponding sound and light alarm after receiving the alarm signal.

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