KR100686941B1 - Integrated Control and Safety Management System for a LNG Storage Tank - Google Patents

Abstract

The present invention relates to an integrated control safety management system of an LNG storage tank, and more specifically, by installing a displacement sensor in each of the inner tank and the corner protection of the LNG storage tank to predict the risk of damage in advance and automatically prevent damage. The present invention relates to an integrated control safety management system for LNG storage tanks.

The integrated control safety management system of the LNG storage tank, which can take appropriate measures by predicting the risk of destruction by the present invention, includes a first displacement sensor installed on an outer circumferential surface of the inner tank, and an inner surface facing the inner tank of the corner protection. Input each signal from LNG storage tank equipped with second displacement sensor, cool down temperature sensor, leakage temperature sensor, pressure sensor, vibration sensor, first displacement sensor and second displacement sensor The integrated control unit for determining the risk of damage to the inner tank and the corner protection and outputting the valve control command; the LNG control valve, the LNG feed valve, the safety valve and the pump by receiving the valve control command of the integrated control unit. It includes an integrated drive unit for driving each.

LNG storage tank, displacement sensor, pressure sensor, integrated control unit

Description

Integrated Control and Safety Management System for a LNG Storage Tank

1 is a schematic diagram of a safety management system of a conventional LNG storage tank

2 is a block diagram of the integrated control safety management system of the LNG storage tank according to the present invention

Figure 3 is an explanatory view of the installation position of the first displacement sensor for the inner tank of the present invention

Figure 4 is an explanatory view of the installation position of the second displacement sensor for the corner protection of the present invention

Figure 5 is an explanatory view of the cool down temperature sensor installation position for the inner tank of the present invention

Figure 6 is an explanatory view of the installation position of the leakage temperature sensor for the corner protection of the present invention

7 is an explanatory view of the pressure sensor installation position in the present invention;

<Brief Description of Drawings>

10 Outer tank 20 Inner tank

30 Corner Protection 110 Cooldown Temperature Sensor

120 Leakage temperature sensor 130 Pressure sensor

140 Vibration sensor 150 First displacement sensor

160 2nd displacement sensor

The present invention relates to an integrated control safety management system of an LNG storage tank, and more specifically, by installing a displacement sensor in each of the inner tank and the corner protection of the LNG storage tank to predict the risk of damage in advance and automatically prevent damage. The present invention relates to an integrated control safety management system for LNG storage tanks.

1 shows a safety management system of a conventional LNG storage tank. As shown in FIG. 1, the conventional LNG storage tank includes an outer tank 10, a corner protection 30 installed at the bottom of the outer tank, and an inner tank 20 installed at an upper portion of the corner protection 30. It consists of. Insulation is usually filled between the corner protection 30 and the inner tank 20. A cool down temperature sensor 110 is installed at an appropriate position on an inner circumferential surface of the inner tank 20, and the temperature measured by the cool down temperature sensor 110 is passed through a cool down temperature signal converter 51. It is measured at 52.

In addition, the temperature sensor 120 is corner protection (30) in order to detect that the evaporation natural gas (Boiling-Off Gas, hereinafter referred to as "BOG") leakage or LNG liquid leaks due to damage of the inner tank (20) It is installed in a proper position of. The temperature sensor 120 can determine whether the leakage and leakage because the ambient temperature is significantly lower than the room temperature when the BOG leaks or the LNG liquid leaks. As such, the temperature measured by the temperature sensor 120 is measured by the temperature measuring instrument 42 via the temperature signal converter 41. In addition, in order to measure the pressure of the inner tank 20, an absolute pressure gauge 61, a gauge pressure gauge 62, a differential pressure gauge 63 for measuring the differential pressure between the inner tank 20 and the heat insulating material space is provided. The pressure measured at each pressure gauge is measured at the pressure gauge 65 via the pressure signal converter 64. In addition, the vibration sensor 140 is installed to measure the vibration of the pump installed in the inner tank bottom plate, the signal measured by the vibration sensor 140 is passed through the vibration signal converter 71 in the vibration measuring device 72 It is measured.

The safety management system of the conventional LNG storage tank as described above reads the values of each sensor by the storage tank manager to determine whether the storage tank is safe or not, and manages the storage tank semi-automatically. However, if the experience of the manager is inexperienced or the environment has changed, there is a limit in managing by experience, and in an urgent situation, the manager cannot cope properly.

In addition, the conventional LNG storage tank safety management system measures the temperature, pressure and vibration only to operate and manage the storage tank, so that the damage of the inner tank 20 or the corner protection 30 cannot be predicted in advance. There is this. That is, the inner tank 20 or the corner protection 30 is broken and BOG gas is leaked, or the LNG is leaked before the damage is detected. That is, even if the inner tank 20 or the corner protection 30 is deformed by the gas pressure or the cryogenic load or the crack / break is already performed, there is no fear that a large accident may occur because there is no measurement system that can detect the crack.

The present invention is to solve the problems of the conventional LNG storage tank safety management system as described above, having a sensor for detecting the deformation behavior of the inner tank and corner protection to predict the risk of destruction of the LNG storage tank in advance. It is an object of the present invention to provide an LNG storage tank.

In addition, the present invention is to provide an integrated control safety management system of LNG storage tanks that can take appropriate measures by predicting the risk of destruction by receiving signals from various sensors including the displacement sensor of the inner tank and corner protection. The purpose.

LNG storage tank having a sensor for detecting the deformation of the inner tank and the corner protection according to an aspect of the present invention to predict the risk of destruction of the LNG storage tank in advance, the corner protection installed in the lower portion of the outer tank, and An LNG storage tank including an inner tank, a pressure sensor, a cool down temperature sensor, a temperature sensor, and a vibration sensor installed at an upper portion of a corner protection, comprising: a first displacement sensor installed on an outer circumferential surface of the inner tank; It further comprises a second displacement sensor installed on the inner peripheral surface of the corner protection facing the tank. In particular, the plurality of first displacement sensors are arranged at equal intervals on the outer circumferential surface of the inner tank, the plurality of second displacement sensors are preferably arranged at equal intervals on the inner circumferential surface facing the inner tank of the corner protection. Do.

The integrated control safety management system of the LNG storage tank, which can take appropriate measures in anticipation of the risk of destruction according to another aspect of the present invention, includes a first displacement sensor installed on an outer circumferential surface of the inner tank, and the corner protection facing the inner tank. Each of the LNG storage tank with a second displacement sensor installed on the inner circumferential surface of the engine, a cool down temperature sensor, a temperature sensor, a pressure sensor, a vibration sensor, a first displacement sensor, and a second displacement sensor are inputted. The integrated control unit for determining the risk of damage to the inner tank and the corner protection and outputting the valve control command; the LNG control valve, the LNG feed valve, the safety valve and the pump by receiving the valve control command of the integrated control unit. It includes an integrated drive unit for driving each.

In addition, in the integrated control safety management system of the LNG storage tank, the integrated control unit additionally outputs a warning command when the signal value of each sensor is out of a predetermined range, and inputs a warning command of the integrated control unit. It may further include an integrated warning unit for outputting to the display unit for displaying a warning command for each sensor value.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

As shown in FIG. 2, the integrated control safety management system of the LNG storage tank according to the present invention includes a signal detector 100 and a signal converter 200 that converts a signal of a sensor detected by the signal detector 100. And a signal measuring unit 300 displaying a physical value of a sensor corresponding to the converted signal value. In addition, the signal value converted by the signal conversion unit 200 is transmitted to the integrated control unit 400. The integrated control unit 400 combines the values of each sensor to determine whether it is within an allowed safety management range. If the value of the sensor is outside the permitted safety management range outputs a warning command to the integrated warning unit 500, and outputs a control command to the integrated drive unit (600). The integrated warning unit 500 displays a warning corresponding to each sensor on the display unit according to a warning command, and the integrated driving unit 600 controls various valves and pumps according to a control command.

The signal detection unit 100 is composed of various sensors installed in the LNG storage tank. The sensor may include a plurality of cool down temperature sensors 110 installed on the bottom plate and the inner wall of the inner tank 20, and a plurality of first displacement sensors 150 disposed on the outer wall and bottom plate outer wall of the inner tank 20. , A plurality of temperature sensors 120 and a second displacement sensor 160 installed at the corner protection 30, a plurality of vibration sensors 140 installed at a pump of the bottom plate of the inner tank 20, and an inner tank 20. It includes a plurality of pressure sensors 130 installed on the virtual circumference of the inner upper end.

In addition, the apparatus controlled by the integrated drive unit 600 is an LNG supply valve 610 and a delivery valve 620, a safety valve 630 and various pumps 640, integrated warning unit 500 Display unit for displaying a warning by a) is provided with a warning module (510-560) corresponding to each sensor.

The integrated control unit 400 includes various control modules that receive signals from each sensor and determine whether they are within an appropriate safety management range. Each control module, as shown, cool down temperature control module 410, temperature control module 420, pressure control module 430, vibration control module 440, the first displacement control module 450, The second displacement control module 460 is configured. In addition, the signal converter 200 has a signal changer corresponding to each sensor. Except for the first and second displacement signal converters 250 and 260 of the respective signal converters, they are the same as those shown in FIG.

3 and 4 illustrate the LNG storage tank in which the first and second displacement sensors are installed to predict the risk of destruction of the LNG storage tank according to the present invention.

As shown in FIG. 3, in the LNG storage tank of this embodiment, eight inner wall bottom plate outer wall sides at equal intervals in the outer wall side corner portions of the inner tank where the bottom plate and the inner tank sidewall of the inner tank 20 meet. 4 to annular plate, 1 to center of bottom plate outer wall, 4 to bottom of outer wall side stiffener 21 where inner tank side wall and stiffener 21 meet, 2 to outer wall side stiffener 21 stop, outer wall Two first displacement sensors 150 (or first stress sensors) are provided at equal intervals along the outer circumference at the upper end of the side stiffener. The plurality of first displacement sensors 150 measure the deformation amount of the inner tank 20 in real time to predict the damage of the inner tank 20 in advance.

In addition, as shown in Figure 4, the LNG storage tank of the present embodiment, six in the corner protection inner corner of the corner protection 30 side wall, one in the bottom center, four corner protection inner wall stop, At the upper end of the corner protection inner wall, two second displacement sensors 160 or second stress sensors are provided at equal intervals along the circumference. The plurality of second displacement sensors 160 may measure the deformation amount of the corner protection 30 in real time to predict the damage of the corner protection 30 in advance.

In addition, Figure 5 shows the arrangement of a plurality of cool down temperature sensors 110 installed in the LNG storage tank of the present embodiment. The cool down temperature sensor 110 of the present embodiment has eight on the outer circumference of the bottom plate of the inner tank 20, four on the inner circumference, one on the center, and an inner wall side lower end along the side wall of the inner tank 20. A total of 21 units are arranged in four, two on the inner wall side breaks, and two on the inner wall top ends. The cool down temperature sensor 110 may predict in advance the breakage of the inner tank 20 which may occur in the process of changing the temperature of the inner tank 20.

6 shows an arrangement of a plurality of temperature sensors 120 installed in the LNG storage tank of this embodiment. The temperature sensor 120 of the present embodiment, four at the lower end of the corner protection inner wall along the corner protection sidewall of the corner protection 30, two at the upper end of the corner protection inner wall, six at the outer periphery of the bottom plate, a total of 12 The dogs are arranged at equal intervals along the circumference. The temperature sensor 120 detects the leakage of the LNG gas or the LNG liquid generated by the damage of the inner tank 20 to finally determine whether the safety of the LNG storage tank system.

In addition, Figure 7 shows the arrangement of a plurality of pressure sensors 130 installed in the LNG storage tank of this embodiment. In the pressure sensor 130 of the present embodiment, the absolute pressure gauge 131, the gauge pressure gauge 132, and the differential pressure gauge 133 are arranged side by side on a virtual circumference of the inner upper end of the inner tank 20, and 180 ° apart along the circumferential direction. There are additional gauge pressure gauges 134 and differential pressure gauges 135. The pressure sensor 130 is disposed symmetrically to more accurately measure the pressure distribution in the inner tank 20 to properly maintain the pressure in the inner tank 20 within the safety management range.

Hereinafter will be described the operation of the LNG storage tank configured as described above and its integrated control safety management system.

The integrated control safety management system of the present invention primarily monitors the signals of the cool down temperature sensor, the pressure sensor, and the first and second displacement sensors to prevent damage to the internal tank, thereby preventing the safety of the storage tank system. In addition, by monitoring the signal of the temperature sensor secondaryly, in case of damage to the internal tank, it is a system that can quickly take measures to ensure safety.

Referring to FIG. 2, a signal input in real time from each sensor of the signal detection unit 100 is converted by the signal conversion unit 200 and input to the integrated control unit 400. The integrated control unit 400 includes a cool down temperature control module 410, a temperature control module 420, a pressure control module 430, a vibration control module 440, a first displacement control module 450, and a second displacement control. Each signal transmitted to the module 460 is analyzed to output a control command and a warning command. The integrated warning unit 500 and the integrated drive unit 600 that have received the control command and the warning command are provided with a plurality of valves to control various gas flows and LNG liquid supplied to or from the LNG storage tank to the optimum safety conditions. And control the pump and display warnings that the operator can recognize.

According to the present invention, it is possible to prevent damage to the inner tank and corner protection to ensure the safety of the tank primarily, and if the inner tank is damaged due to unavoidable damage, integrated control that can prevent a large-scale disaster due to the outer tank damage Provide a safety management system.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

Claims (4)

In an LNG storage tank including a corner protection installed in the lower portion of the outer tank, an inner tank provided in the upper portion of the corner protection, a pressure sensor, a cool down temperature sensor, a temperature sensor, and a vibration sensor, The LNG storage tank further comprises a first displacement sensor installed on the outer circumferential surface of the inner tank, and a second displacement sensor provided on the inner circumferential surface of the corner protection facing the inner tank. The method of claim 1, The first displacement sensor is a plurality, it is arranged on the outer peripheral surface of the inner tank at equal intervals, The second displacement sensor is plural and arranged at equal intervals on the inner circumferential surface of the corner protection facing the inner tank, The plurality of pressure sensors and the LNG storage tank, characterized in that the gauge pressure gauge and the differential pressure gauge 180 degrees apart on the virtual inner peripheral surface of the upper end of the inner tank is installed. An LNG storage tank according to claim 1 or 2, The cool down temperature sensor, the temperature sensor, the pressure sensor, the vibration sensor, the first displacement sensor, the second displacement sensor receives the respective signals, the risk of damage to the inner tank and corner protection is determined and the valve An integrated control unit for outputting control commands, The integrated control safety management system of the LNG storage tank, characterized in that it comprises an LNG supply valve, an LNG delivery valve, a safety valve, and an integrated drive unit for driving the pump, respectively, by receiving the valve control command of the integrated control unit. The method of claim 3, The integrated control unit additionally outputs a warning command when the signal value of each sensor received is out of a predetermined range, The integrated control safety management system of the LNG storage tank, further comprising an integrated warning unit which receives the warning command of the integrated control unit and outputs it to a display unit for displaying a warning command for each sensor value.

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