Liquefied natural gas storage tank leakage detection device

Abstract

The utility model relates to a leakage detection device for a liquefied natural gas storage tank, which belongs to the technical field of liquefied natural gas management and comprises a control box and at least two temperature acquisition elements, a fixing support is arranged on the outer side of each temperature acquisition element, and the temperature acquisition elements are fixed in a liquid collection pool of the liquefied natural gas storage tank through the fixing supports. Each temperature acquisition element is provided with a temperature transmitter and a temperature controller, the temperature acquisition elements are connected to the input end of the temperature controller in the control box through the temperature transmitters, an alarm is arranged in the control box, and the alarm is connected to the output end of the temperature controller; a plurality of temperature acquisition elements are arranged in a liquid collection pool, so that the temperature change at the initial stage of leakage is accurately captured. By means of the design, local temperature reduction caused by LNG leakage can be monitored in time, and therefore the sensitivity and accuracy of leakage detection are remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquefied natural gas management, and in particular relates to a leakage detection device for a liquefied natural gas storage tank. Background Art

[0002] In the field of storage and transportation of liquefied natural gas (LNG), safety is always the primary consideration. With the growth of energy demand, large atmospheric pressure storage tanks have become the main way to store LNG. Their design must take into account both efficient storage and safety. However, despite the use of 5000m 3 Advanced designs such as vertical cylindrical double-layer metal-walled storage tanks ensure high structural strength and thermal insulation performance to cope with potential risks such as thermal expansion of the medium. However, the low temperature characteristics and high volatility of LNG still make leakage a safety hazard that cannot be ignored.

[0003] In the existing technology, the leakage detection of LNG storage tanks mainly relies on the regular inspection of the surface of the storage tank or the transmission pipeline by manual handheld leak detectors, and the installation of fixed detection devices on the pipelines. Although this method can detect leaks to a certain extent, it has the disadvantages of low detection efficiency, limited coverage, and slow response speed. Especially in the early stage of leakage, if the leakage point is located at the bottom of the storage tank or in a hidden location, traditional detection methods may be difficult to detect in time, resulting in an increase in leakage and an increase in the risk of accidents.

[0004] In addition, the liquid collecting pool is a key facility for collecting LNG in the early stage of a tank leak. The change in its internal temperature can sensitively reflect the leakage. However, there is currently a lack of automated temperature monitoring methods in the liquid collecting pool, which cannot accurately capture the temperature changes caused by the leak in real time, thus delaying the emergency response time. Utility Model Content

[0005] The purpose of the utility model is to provide a liquefied natural gas storage tank leakage detection device designed to solve the problems existing in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A liquefied natural gas storage tank leakage detection device comprises a control box and at least two temperature collection elements, each of which is provided with a fixed bracket on the outside, and the temperature collection element is fixed in a liquid collecting tank of the liquefied natural gas storage tank through the fixed bracket; each temperature collection element is provided with a temperature transmitter and a temperature controller, the temperature collection element is connected to the input end of the temperature controller in the control box through the temperature transmitter, an alarm is provided in the control box, and the alarm is connected to the output end of the temperature controller.

[0008] A further improvement of this technical solution is that three temperature acquisition elements are provided and installed on three side walls of the liquid collection tank.

[0009] A further improvement of this technical solution is that the control box is also equipped with an intermediate relay for each temperature controller. The normally open switch of the temperature controller is connected to the corresponding intermediate relay coil. The normally open switches of the intermediate relays are connected in series in pairs, and the normally open switches of the intermediate relays connected in series in pairs are connected in series to the alarm.

[0010] A further improvement of this technical solution is that the fixing bracket includes a galvanized pipe and a flat iron block. The flat iron block is arranged on the outside of the galvanized pipe. The temperature acquisition element is installed inside the galvanized pipe, and the galvanized pipe is welded to the side wall of the liquid collection tank through the flat iron block.

[0011] A further improvement of this technical solution is that a display screen is also included. The display screen is arranged on the outside of the control box and is connected to the output end of the temperature controller.

[0012] A further improvement of this technical solution is that the temperature acquisition element uses a thermal resistance with the model PT100.

[0013] A further improvement of this technical solution is that the temperature transmitter uses a temperature transmitter with the model WDBSQ-01P.

[0014] The beneficial effects of this utility model are as follows:

[0015] Improve the sensitivity and accuracy of leakage detection: By arranging multiple temperature acquisition elements in the liquid collection tank, precise capture of the temperature change in the initial stage of leakage is realized. This design enables any local temperature reduction caused by LNG leakage to be monitored in a timely manner, thus significantly improving the sensitivity and accuracy of leakage detection.

[0016] Enhance the emergency response speed: Once the temperature acquisition element detects an abnormal temperature change, the temperature transmitter immediately transmits the signal to the temperature controller in the control box for analysis. If it is determined to be a leakage, the alarm is immediately triggered. This process greatly shortens the time from the occurrence of leakage to the issuance of an alarm, secures precious time for taking timely emergency measures, and reduces the accident risk.

[0017] In addition, the design principle of this utility model is reliable, the structure is simple, and it has a very wide application prospect.

[0018] It can be seen that compared with the prior art, this utility model has outstanding substantial features and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a relational schematic diagram of this leakage detection device.

[0020] Figure 2 It is a schematic diagram of the internal connection relationship of the control box.

[0021] 110 is the control box, ALM is the temperature controller, Buz is the alarm, KA is the intermediate relay, 120 is the temperature acquisition element, 130 is the temperature transmitter, 140 is the power module, and 150 is the electric valve of the fire foam station. Specific implementation manner

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

[0024] As Figure 1 shown, the present invention provides a leakage detection device for a liquefied natural gas storage tank, including a control box and at least two temperature acquisition elements. A fixing bracket is arranged on the outer side of each temperature acquisition element, and the temperature acquisition element is fixed in the liquid collection pool of the liquefied natural gas storage tank through the fixing bracket; each temperature acquisition element is configured with a temperature transmitter and a temperature controller. The temperature acquisition element is connected to the input end of the temperature controller in the control box through the temperature transmitter. An alarm is arranged in the control box, and the alarm is connected to the output end of the temperature controller. Among them, the temperature acquisition element uses a thermal resistor with the model PT100, the temperature transmitter uses a temperature transmitter with the model WDBSQ-01P, and the alarm is a buzzer.

[0025] Specifically, the detection device is provided with three temperature acquisition elements, which are installed on the three side walls of the liquid collection pool, 30 centimeters away from the bottom of the liquid collection pool. The three temperature detection points are installed in a triangular orientation to ensure the detection accuracy.

[0026] In addition, the fixing bracket includes a galvanized pipe and a flat iron block. The flat iron block is arranged on the outer side of the galvanized pipe. The temperature acquisition element is installed in the galvanized pipe, and the galvanized pipe is welded to the side wall of the liquid collection pool through the flat iron block.

[0027] As Figure 2As shown, the control box is also equipped with an intermediate relay for each temperature controller. The normally open switch of the temperature controller is connected to the corresponding intermediate relay coil. The normally open switches of the intermediate relays are connected in series in pairs, and the normally open switches of the intermediate relays after being connected in series in pairs are connected in series to the alarm. When the temperatures collected by any two of the temperature acquisition elements are simultaneously lower than the preset -50 degrees Celsius, the temperature controller controls to turn on the corresponding buzzer for alarm.

[0028] In addition, a display screen and a power supply module for powering the entire device are also provided on the control box. The display screen is arranged on the outer side of the control box and is connected to the output end of the temperature controller.

[0029] Finally, the temperature controller of the control box of the present application is also connected to the electric valve of the fire foam station configured for the liquefied natural gas storage tank. When the temperature controller detects that the temperature in the liquid collection pool is lower than the preset -50 degrees Celsius, the temperature controller controls to open the electric valve of the fire foam station to output foam, so as to isolate the liquid level of the liquefied natural gas from the air, which can effectively reduce the vaporization rate on the surface of the natural gas, reduce the vaporization speed of the liquefied natural gas, and reduce the coverage range of the combustible gas.

[0030] The above - disclosed is only the preferred embodiment of the present utility model, but the present utility model is not limited thereto. Any non - creative changes that can be thought of by those skilled in the art, as well as several improvements and refinements made without departing from the principle of the present utility model, should fall within the protection scope of the present utility model.

Claims

1. A liquefied natural gas storage tank leakage detection device, characterized in that: It includes a control box and at least two temperature collection elements. A fixed bracket is provided on the outside of each temperature collection element, and the temperature collection element is fixed in the liquid collecting tank of the liquefied natural gas storage tank through the fixed bracket; each temperature collection element is equipped with a temperature transmitter and a temperature controller, and the temperature collection element is connected to the input end of the temperature controller in the control box through the temperature transmitter. An alarm is provided in the control box, and the alarm is connected to the output end of the temperature controller.

2. The liquefied natural gas storage tank leakage detection device according to claim 1, characterized in that: Three temperature collecting elements are provided and installed on three side walls of the liquid collecting tank.

3. The liquefied natural gas storage tank leakage detection device according to claim 1, characterized in that: The control box is also equipped with an intermediate relay for each temperature controller. The normally open switch of the temperature controller is connected to the corresponding intermediate relay coil. The normally open switches of the intermediate relays are connected in series in pairs. The normally open switches of the intermediate relays connected in series in pairs are connected in series to the alarm.

4. The liquefied natural gas storage tank leakage detection device according to claim 1, characterized in that: The fixed bracket includes a galvanized pipe and a flat iron block. The flat iron block is arranged on the outside of the galvanized pipe. The temperature collection element is installed in the galvanized pipe. The galvanized pipe is welded to the side wall of the liquid collecting tank through the flat iron block.

5. The liquefied natural gas storage tank leakage detection device according to claim 1, characterized in that: The control box also includes a display screen, which is arranged on the outside of the control box and connected to the output end of the temperature controller.

6. The liquefied natural gas storage tank leakage detection device according to claim 1, characterized in that: The temperature acquisition element adopts a PT100 thermal resistor.

7. The liquefied natural gas storage tank leakage detection device according to claim 1, characterized in that: The temperature transmitter used is a WDBSQ-01P temperature transmitter.

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