KR101975817B1 - A liquid gas pumping system - Google Patents

Abstract

Disclosed is a liquefied gas pumping system. The liquefied gas pumping system includes: a liquefied gas storage storing liquefied gas; a liquefied gas pump pumping the liquefied gas from the liquefied gas storage to a target position; a liquefied gas inflow line connecting the liquefied gas storage and the liquefied gas pump and including a first meter metering an inflow liquefied gas amount (A); a liquefied gas pump discharge line connecting the target position and the liquefied gas pumped from the liquefied gas pump and including a second meter metering a discharge liquefied gas amount (B); and a control part determining a gasified gas amount in the liquefied gas pump by comparing the discharge liquefied gas amount (B) to the inflow liquefied gas amount (A). Therefore, the liquefied gas pumping system is capable of accurately collecting only gasified gas and efficiently controlling a liquefied gas pump by confirming a gasification position for the liquefied gas pump in real time.

Description

Liquefied Gas Pumping System {A LIQUID GAS PUMPING SYSTEM}

The present invention relates to a liquefied gas pumping system for pumping cryogenic liquefied gas, for example liquefied natural gas.

Liquefied natural gas is a fuel made in a liquid state by cooling to -162 ℃, and its volume is reduced to 1/600 by liquefaction, so it is easy to transport. Liquefied natural gas has been spotlighted as the most stable source of energy supply due to the development of various mining methods (new natural gas oil field, sail gas, etc.). Cryogenic liquefied gas pumping system is used to transport and pressurize liquefied natural gas, and is used in transport ships, introduction bases, liquefaction bases, chemical plants, etc., and the demand is greatly increased on the basis of the increase in the demand for clean energy.

The cryogenic liquefied gas pumping system is one of the more power-consuming devices and must be very careful about its stability because it deals with the highly explosive cryogenic liquefied gas. In addition, liquefied natural gas has a temperature difference of 187 ° C or higher between, for example, a storage tank, a transfer pipe, and an external room temperature of 25 ° C and an internal -162 ° C of a liquid pump, so that natural vaporization occurs even when a thermal barrier means such as a double pipe or a double wall is used. It must happen. Natural vaporization of such liquefied gas causes explosion risk, commercial loss, pump failure, and the like. The cryogenic liquefied gas pumping system changes its operating conditions in real time due to many variables. This change in operating conditions in real time adversely affects the energy consumption efficiency and the transfer efficiency, and makes it difficult to diagnose and handle the real-time failure of the pumping system and to diagnose and treat the gas leakage.

An object of the present invention is to provide a liquefied gas pumping system that can improve the pump pumping efficiency and the transportation efficiency of the liquefied gas by judging in real time the abnormal vaporization position or degree of vaporization during the pumping and / or transportation of the liquefied gas.

Another object of the present invention is to provide a liquefied gas pumping system capable of a predictive maintenance service that performs real-time diagnosis and processing of the pumping system and real-time diagnosis and processing of gas leakage.

There is provided a liquefied gas pumping system for achieving the above object. The liquefied gas pumping system includes a liquefied gas reservoir for storing liquefied gas, a liquefied gas pump for pumping the liquefied gas from the liquefied gas reservoir to a target position, and a connection between the liquefied gas reservoir and the liquefied gas pump and the amount of inlet liquefied gas. A liquefied gas inflow line having a first meter for measuring (A) and a liquefied gas having a second meter for connecting the liquefied gas pumped by the liquefied gas pump to a target position and measuring the amount of liquefied liquefied gas (B) And a control unit configured to determine the amount of vaporized gas in the liquefied gas pump by comparing a pump discharge line with the discharged liquefied gas amount B and the inlet liquefied gas amount A.

The liquefied gas pump and the liquefied gas reservoir to connect the liquefied gas pump and the liquefied gas reservoir to recover the liquefied gas pump further comprises a liquefied gas recovery line having a valve disposed between the liquefied gas pump, the control unit The valve of the vaporization gas line may be controlled based on the determined amount of vaporization gas.

The vaporization gas containing sensor further comprises a vibration generating unit for generating a vibration on the upper end of the outer wall of the liquefied gas pump and a plurality of waveform receivers disposed opposite and vertically spaced apart from the vibration generating unit, the control unit comprises a plurality of The waveform receiving unit may compare the received waveform with a preset reference waveform according to the waveform passing medium to determine the vaporized gas level in the liquefied gas pump.

The controller may determine the amount of vaporized gas in the liquefied gas pump with reference to the capacity C of the liquefied gas pump.

The vaporization gas ash line includes a third meter to measure the amount of vaporized gas recovered (D), and the control unit is a target pumping discharge amount discharged to the target position to the inlet liquefied gas amount (A) the amount of vaporized gas (D) The liquefied gas pump can be controlled to be equal to the sum of.

The liquefied gas pumping system according to the present invention prevents failure or malfunction of the liquefied gas pump by determining an abnormal vaporization by judging the degree of vaporization generated during the pumping of the liquefied gas in real time, increasing the pumping efficiency of the liquefied gas, and vaporizing the liquefied gas. Lower commercial losses.

In particular, the liquefied gas pumping system can collect and analyze the state data of the system in real time, thereby enabling a preliminary maintenance service that performs real-time failure diagnosis and processing of the system and real-time diagnosis and processing of gas leakage.

1 is a schematic diagram showing a liquefied gas pumping system according to an embodiment of the present invention,
Figure 2 is a block diagram showing a liquefied gas pumping system according to an embodiment of the present invention
3 is a view showing the structure of a liquefied gas pump according to an embodiment of the present invention,
4 is a block diagram showing a test bed 1 'of a liquefied gas pumping system according to an embodiment of the present invention;
5 is a view showing a state in which a vaporization gas content sensor is installed in the liquefied gas pump,
6 is a view showing a state in which a vaporization gas content sensor is installed in the liquefied gas transfer line,
7 is a flow chart showing a control method of a liquefied gas pumping system according to an embodiment of the present invention, and
8 is a flowchart illustrating a control method of a liquefied gas pumping system according to another exemplary embodiment of the present invention.

Hereinafter, a liquefied gas pumping system 1 according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram showing a liquefied gas pumping system 1 according to an embodiment of the present invention. The liquefied gas pumping system 1 includes a liquefied gas storage 100, a liquefied gas pump 200, an IoT device main controller 300, an internet network 400, a main manager mobile device 500, and a sub manager mobile device ( 600).

The liquefied gas reservoir 100 stores the liquefied gas, for example, natural gas, nitrogen gas, argon gas, propane gas, etc., by compressing the liquefied gas to an ultra low temperature of -196 ° C or lower. The liquefied gas reservoir 100 includes a gas tank IoT device 102 and a tank sensor 103.

The tank sensor 103 includes a vaporization gas content sensor, a temperature sensor, a pressure sensor, a displacement sensor, a vibration sensor, and the like.

The gas tank IoT device 102 includes a programmable logic controller 1 (PLC1) 104, an IoT communication module 1 106, and a memory 108. The gas tank IoT device 102 measures the state of the liquefied gas storage 100 using a plurality of tank sensors 103, for example, gaseous gas phase, temperature, pressure, liquefied gas gas, vibration, and the like in real time. In FIG. 2, the PLC1 104 and the IoT communication module 1106 may be installed for each sensor such as a vaporization gas content sensor, a temperature sensor, a pressure sensor, a displacement sensor, and a vibration sensor. That is, the tank sensors 103 may be integrally installed when the positions are close to each other and the wires are easy to install, or when the distances are far from each other and the wires are difficult to install.

The PLC1 104 controls the components of the gas tank IoT device 102, for example, the IoT communication module 1 106 and the memory 108 as a whole. The PLC1 104 parses the data acquisition method setting message transmitted by the IoT device main controller 300 and applies it to the tank sensor 103. In addition, the PLC1 104 stores the IoT data module 1106 with state data such as vaporization gas content data, temperature data, pressure data, displacement data, and vibration data measured by the tank sensor 103 according to the set acquisition method. Real-time transmission to the IoT device main controller 300 through. The state data measurement method is patched by the IoT device main controller 300 as necessary. The measurement method largely uses polling and push. Polling is a method in which a user periodically reads data from a sensor, and push is a method of delivering data to a user when a specific event occurs on the sensor side. In addition, there are model-driven and batching methods that are optimized based on push. If the sensor data is not processed frequently, it is advantageous to use a batching method that collects and delivers the sensor data, and if the small change of the sensor data is meaningless, use a model-driven method that delivers only when the sensor data changes significantly. It is advantageous. If the sensor device cannot use the batching or model-driven method in hardware, the polling method may be used.

The IoT communication module 1 106 communicates with the IoT device main controller 300. IoT communication module 1 (106) is a mobile wireless communication module such as 2G, 3G, 4G, Long Term Evolution (LTE), Wireless LAN (WLAN) (Wi-Fi), Wireless broadband (Wibro), World Interoperability for Microwave Access Wireless communication module such as HSDPA (High Speed Downlink Packet Access), short range communication module such as Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, etc. Etc. can be applied. Depending on the needs or environment, the IoT communication module 1 106 may apply a data communication module such as VDSL, Ethernet, token ring, high definition multimedia interface (HDMI), USB, component, LVDS, HEC, or the like.

The memory 108 temporarily or permanently stores state data such as vaporization gas content data, temperature data, pressure data, displacement data, and vibration data detected by the tank sensor 103.

The liquefied gas pump 200 includes a casing 210, a suction line 220, a pump assembly 230, a pumping line 240, and a return line 250 as shown in FIG. 3. The liquefied gas pump 200 also includes a liquefied (vaporized) gas outlet 260 for discharging liquefied gas or vaporized gas to the outside before operation, and a power line 270 for transmitting power for driving the motor 233.

Casing 210 is a double container consisting of the outer case 212 and the inner case 214 made of a cryogenic material, as shown in Figure 3, by maintaining a vacuum between the outer case 212 and the inner case 214 Minimize external heat transfer. The casing 210 should pass through the suction line 220, the pumping line 240, the return line 250, the liquefied (vaporized) gas outlet 260, and the power line 270 in a completely sealed state.

The suction line 220 is a suction port for sucking the liquefied gas supplied from the liquefied gas reservoir 100. As shown in FIG. 3, the suction line 220 directly flows the liquid gas into the lower pumping space PS after being introduced into the liquefied gas pump 200.

The pump assembly 230 includes a motor housing 231, a motor shaft 232, a motor 233, an impeller 234, an inducer 235, and a plurality of pump support protrusions 236.

The motor housing 231 supports the pumping line 240 upwardly and rotatably supports the motor shaft 232 downwardly.

The motor shaft 232 fixedly supports a rotor (not shown), an impeller 234, and an inducer 235 made of a permanent magnet or a winding coil constituting the motor 233.

The motor 233 is a cryogenic dedicated motor and is composed of an annular stator (not shown) consisting of a plurality of winding coils and a cylindrical rotor (not shown) of a permanent magnet. The motor 233 operates in the state exposed to the liquid gas.

The impeller 234 is supported by the rotating motor shaft 232 to compress and discharge the introduced liquefied gas. The liquefied gas compressed by the impeller 235 is liquefied again by low temperature compression even if the vaporized gas is contained.

The inducer 235 sucks the liquid gas in the pumping space PS and supplies it to the impeller 235.

The pump support protrusion 236 protrudes from the outer circumferential surface of the impeller 234 toward the inner case of the casing 210 and comes into contact with the pump support protrusion 236. Pump support protrusion 236 is preferably made of three or more. The pump support protrusion 236 may adjust the protruding length. The pump support protrusion 236 preferably has a small area at the contact end in order to reduce the contact area for heat transfer.

As shown in FIG. 3, the pumping line 240 includes a first manifold 242, a plurality of vertical distribution pipes 244, a second manifold 246, and a pumping discharge pipe 248.

The first manifold 242 has an internal liquefied gas passage communicating with the plurality of vertical distribution pipes 244. The first manifold 242 has an outer shape similar to that of the adjacent casing inner case 214. The first manifold 242 is formed in a size that allows maximum access to the casing inner case 214 as much as possible. Since the pump assembly 230 is stably fixedly supported by the pump support protrusion 236, the first manifold 242 may approach the casing inner case 214 in a non-contact state as much as possible.

The first manifold 242 primarily divides the inner space of the casing 210 into the lower pumping space PS and the upper vaporization space BS. The first manifold 242 prevents the liquefied gas introduced through the suction line 220 from joining the vaporized gas vaporized in the liquefied gas pump 200 as much as possible. That is, the heat introduced to the outside through the casing 210, the heat generated from the pump assembly 230 therein, the heat transferred through the support for supporting the pump assembly 230 to the casing 230, the pump assembly 230 Vaporized gas due to heat transferred through the cable for transmitting power to the) is blocked by the first manifold 242 and then moved upwards inside the liquefied gas pump 200. As described above, since the first manifold 242 of the present invention blocks the above-described vaporization gas, the vaporization gas contained in the liquefied gas pumped in the liquefied gas pump 200 can be reduced to a minimum. As a result, the efficiency of pumping can be greatly improved by minimizing vaporization gas content in the liquefied gas being pumped. If the vaporized gas is contained in the liquefied gas to be pumped, an error may occur when determining an abnormal vaporized position at the liquefied gas pump discharge pipe 140 to be described later.

The vertical distribution pipe 244 serves to transfer the liquefied gas of the first manifold 242 to the second manifold 246. For example, four vertical distribution pipes 244 may be disposed at 90-degree intervals.

The second manifold 246 is provided with a liquefied gas passage communicating with the plurality of vertical distribution pipes 244. Like the first manifold 242, the second manifold 246 has an appearance similar to that of the adjacent casing inner case 214. The second manifold 246 is formed to a size that allows maximum access to the casing inner case 214 as much as possible. Since the pump assembly 230 is stably fixedly supported by the pump support protrusion 236, the second manifold 246 may approach the casing inner case 214 in a non-contact state as much as possible.

The second manifold 246 secondaryly partitions the inner space of the casing 210 up and down. The second manifold 246, along with the first manifold 242, divides the lower pumping space PS and the upper vaporization space BS more reliably. As a result, the second manifold 246 prevents the vaporized gas vaporized from the liquefied gas pump 200 from joining with the liquefied gas introduced through the suction line 220.

The pumping discharge pipe 248 is a discharge pipe for discharging the liquid gas compressed by the pump assembly 230 to the outside. The pump assembly 230 of the liquefied gas pump 200 of the present invention is supported by a pumping discharge pipe 248 instead of a separate support part supporting the casing 210. The pumping discharge pipe 248 maintains an overall low temperature state because the cryogenic liquid gas therein passes, and as a result, the heat transferred to the liquefied gas pump 200 may be reduced.

The liquefied gas pump 200 includes a pump sensor 203 and a pump IoT device 202 as shown in FIG. 2.

The pump sensor 203 includes a vaporization gas content sensor, a temperature sensor, a pressure sensor, a displacement sensor, a vibration sensor, and the like. The pump sensor 203 is mounted on the outer wall of the inner case 214 between the outer case 212 and the inner case 214 of the casing 210 rather than being installed inside the liquefied gas pump 200 in an ultra low temperature state. Do.

The pump IoT device 202 includes a programmable logic controller 2 (PLC2) 204, an IoT communication module 2 206, and a memory 208. The pump IoT device 202 uses a plurality of pump sensors 203 for the state data of the liquefied gas pump 200, for example, gaseous gas phase, motor rotation speed, operating voltage, operating current, operating time, vibration, and temperature. Measure status data such as pressure and pressure in real time.

The PLC2 204 generally controls the components of the pump IoT device 202, for example, the IoT communication module 2 206 and the memory 208. The PLC2 204 parses the data acquisition method setting message transmitted from the IoT device main controller 300 and applies it to the pump sensor 203. In addition, the PLC2 204 uses the IoT communication module 2 206 to transmit status data such as vaporization gas content data, temperature data, pressure data, displacement data, and vibration data measured by the pump sensor 203 according to the set acquisition method. Real-time transmission to the IoT device main controller 300 through.

The IoT communication module 2 206 communicates with the IoT device main controller 300. IoT communication module 2 206 is a mobile wireless communication module such as 2G, 3G, 4G, Long Term Evolution (LTE), Wireless LAN (WLAN) (Wi-Fi), Wireless broadband (Wibro), World Interoperability for Microwave Access Wireless communication module such as HSDPA (High Speed Downlink Packet Access), short range communication module such as Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, etc. Etc. can be applied. The IoT communication module 2 206 may apply a data communication module such as VDSL, Ethernet, token ring, high definition multimedia interface (HDMI), USB, component, LVDS, HEC, etc. according to need or environment.

The memory 208 temporarily or permanently stores state data such as gaseous gas level data, temperature data, pressure data, displacement data, and vibration data detected by the pump sensor 203.

The liquefied gas pumping system 1 of the present invention may further include an additional liquefied gas pump which can be operated preliminarily in case of failure.

As shown in FIG. 1, the liquefied gas pumping system 1 includes a liquefied gas tank supply line 110 for supplying liquefied gas to a liquefied gas reservoir 100, and a liquid gas from a liquefied gas reservoir 100. The liquefied gas pump inflow line 120 introduced into the 200, the vaporized gas recovery line 130 for recovering the vaporized gas of the liquefied gas pump 200 to the liquefied gas storage 100, the pumped from the liquefied gas pump 200 It includes a pump discharge line 140 for discharging the liquefied gas to the target position (Target1 ~ 4), and a plurality of discharge branch line (150-1 ~ 150-4) branched from the pump discharge line 140.

Liquefied gas tank supply line 110 is a pipe for supplying liquefied gas to the liquefied gas storage 100 is composed of a double pipe to block the external heat to prevent natural vaporization. The liquefied gas tank supply line 110 includes a first valve 111, a first transfer pipe sensor 113, and a first flow meter 115 that detects the amount of liquid gas supplied to the liquid gas storage 100. The first valve 111, the first transfer pipe sensor 113, and the first flow meter 115 of the liquefied gas tank supply line 110 are controlled by the gas tank supply IoT device 112.

The first valve 111 blocks or supplies the liquid gas supplied to the liquid gas storage 100 by the gas tank supply IoT device 112.

The first transfer pipe sensor 113 is installed in a space between the outer tube and the inner tube of the double pipe liquefied gas tank supply line 110 to reduce the influence of the outside and the pipe. The first transport pipe sensor 113 includes at least one vaporization gas content sensor. The gaseous gas content sensor detects the gaseous gas content contained in the liquefied gas flowing through the liquefied gas tank supply line 110 in real time. The gaseous gas content is not a digital value but an analog value set by an experiment. That is, the first transfer pipe sensor 113 artificially applies ultrasonic waves or vibration waves to the liquefied gas tank supply line 110 to obtain ultrasonic waves or vibration waves changed according to a medium inside the liquefied gas tank supply line 110. The changed ultrasonic wave or vibration wave is transmitted to the IoT device main controller 300 by the gas tank supply IoT device 112 and compared with the preset reference gas content data to determine whether the abnormal vaporization and vaporization position.

The first flow meter 115 measures the amount of liquefied gas introduced through the liquefied gas tank supply line 110. The liquefied gas volume data measured by the first flow meter 115 is transmitted to the gas tank supply IoT device 112.

The gas tank supply IoT device 112 controls the first valve 111, the first transfer sensor 113, and the first flow meter 115, receives and processes the detected data, or transmits it to the outside. The gas tank supply IoT device 112 includes a programmable logic controller 3 (PLC3) 114, an IoT communication module 3 116, and a memory 118. The gas tank supply IoT device 112 receives the vaporization gas content data detected by the first transport pipe sensor 113, transmits the data to the IoT device main controller 300, and stores the data in the memory 118.

The PLC3 114 generally controls the components of the gas tank supply IoT device 112, for example, the IoT communication module 3 116 and the memory 118.

The IoT communication module 3 116 communicates with the IoT device main controller 300. IoT communication module 3 (116) is a state of the IoT device main controller (e.g., gaseous gas content data detected by the liquefied gas tank supply line 110, supply flow rate data, temperature data, pressure data, etc. detected by the first flow meter) 300).

The memory 118 temporarily or permanently stores state data such as vaporization gas content data detected by the first transport pipe sensor 113, supply flow rate data detected by the first flowmeter, temperature data, and pressure data.

The liquefied gas pump inflow line 120 is a pipe for supplying liquefied gas from the liquefied gas reservoir 100 to the liquefied gas pump 200, and is configured as a double pipe to block external heat to prevent natural vaporization. The liquefied gas pump inlet line 120 includes a second valve 121, a second transfer pipe sensor 123, and a second flow meter 125 for detecting the amount of liquid gas supplied to the liquid gas pump 200. The second valve 121, the second transfer pipe sensor 123, and the second flow meter 125 of the liquefied gas pump inlet line 120 are controlled by the pump inlet line IoT device 122.

The second valve 121 blocks or supplies the liquid gas supplied to the liquid gas pump 200 by the pump inlet line IoT device 122.

The second transfer pipe sensor 123 is installed in the space between the outer tube and the inner tube of the double pipe liquefied gas pump inlet line 120 to reduce the influence of the outside and the pipe. The second transfer pipe sensor 123 includes at least one vaporization gas content sensor. The vaporization gas content sensor detects the vaporization gas content contained in the liquefied gas flowing through the liquefied gas pump inlet line 120 in real time. The gaseous gas content is not a digital value but an analog value set by an experiment. That is, the second transfer pipe sensor 123 artificially applies ultrasonic waves or vibration waves to the liquefied gas pump inflow line 120 to obtain ultrasonic waves or vibration waves changed according to a medium inside the liquefied gas pump inflow line 120. The changed ultrasonic wave or vibration wave is transmitted to the IoT device main controller 300 by the pump inlet line IoT device 122, and compared with the preset reference vaporization gas content data to determine whether abnormal vaporization and abnormal vaporization position.

The second flow meter 125 measures the amount of liquefied gas introduced into the liquefied gas pump 200 through the liquefied gas pump inflow line 120. The liquefied gas amount data measured by the second flow meter 125 is transferred to the pump IoT device 122.

The pump inflow line IoT device 122 controls the second valve 121, the second transfer sensor 123, and the second flow meter 125, receives, processes, or transmits detection data to the outside. The pump inflow line IoT device 122 includes a programmable logic controller 4 (PLC4) 124, an IoT communication module 4 126, and a memory 128. The pump inflow line IoT device 122 receives the vaporization gas content data detected by the second transport pipe sensor 123, transmits the data to the IoT device main controller 300, and stores the data in the memory 128.

The PLC4 124 generally controls the components of the pump inflow line IoT device 122, for example, the IoT communication module 4 126 and the memory 128.

The IoT communication module 4 126 communicates with the IoT device main controller 300. IoT communication module 4 (126) is a state of the IoT device main controller (e.g., gaseous gas content data detected by the liquefied gas pump inlet line 120, inflow flow data detected by the second flowmeter, temperature data, pressure data, etc.) 300).

The memory 128 temporarily or permanently stores state data such as vaporization gas content data detected by the second transfer pipe sensor 123, inflow flow rate data detected by the second flowmeter, temperature data, and pressure data.

The vaporization gas recovery line 130 is a pipe that recovers vaporized gas from the liquefied gas pump 200 to the liquefied gas storage 100 and includes a double pipe that blocks external heat to prevent natural vaporization. The vaporization gas recovery line 130 includes a third valve 131, a third transfer pipe sensor 133, and a third flow meter 135 for detecting the amount of vaporized gas recovered from the liquid gas pump 200. The third valve 131, the third transfer pipe sensor 133, and the third flow meter 135 of the vaporization gas recovery line 130 are controlled by the recovery line IoT device 132.

The third valve 131 blocks or supplies the vaporized gas recovered from the liquid gas pump 200 by the recovery line IoT device 132.

The third transfer pipe sensor 133 is installed in the space between the outer tube and the inner tube of the double pipe vaporization gas recovery line 130 to reduce the influence of the outside and the pipe. The third transfer pipe sensor 133 includes at least one vaporization gas content sensor. The vaporization gas content sensor detects the vaporization gas content contained in the vaporization gas flowing through the vaporization gas recovery line 130 in real time. The gaseous gas content detected by the third transfer pipe sensor 133 will ideally include only the purified gaseous gas when the gaseous gas level of the liquefied gas pump 200 is accurately determined. Of course, if the vaporization gas level of the liquefied gas pump 200 is not detected correctly and the control timing of the third valve 131 does not match, the liquefied gas and the vaporized gas will be mixed and recovered. As such, when the liquefied gas is recovered together without recovering only the pure vaporized gas, the efficiency of the liquefied gas pump 200 is lowered. Similarly, the vaporization gas content is not a digital value but an analog value set by an experiment. That is, the third transfer pipe sensor 133 artificially applies ultrasonic waves or vibration waves to the vaporization gas recovery line 130 to obtain ultrasonic waves or vibration waves changed according to the medium inside the vaporization gas recovery line 130. The changed ultrasonic wave or vibration wave is transmitted to the IoT device main controller 300 by the recovery line IoT device 132, and is compared with the preset reference vaporization gas content data to determine an abnormal vaporization recovery state.

The third flow meter 135 measures the amount of vaporized gas introduced into the liquefied gas storage 100 through the vaporized gas recovery line 130. The gaseous gas amount data measured by the third flow meter 135 is transferred to the recovery line IoT device 132.

The recovery line IoT device 132 controls the third valve 131, the third transfer sensor 133, and the third flow meter 135, receives and processes the detected data, or transmits it to the outside. The recovery line IoT device 132 includes a programmable logic controller 5 (PLC5) 134, an IoT communication module 5 136, and a memory 138. The recovery line IoT device 132 receives the vaporization gas content data detected by the third transport pipe sensor 133, transmits the data to the IoT device main controller 300, and stores the data in the memory 138.

The PLC5 134 generally controls the components of the recovery line IoT device 132, for example, the IoT communication module 5 136 and the memory 138.

The IoT communication module 5 136 communicates with the IoT device main controller 300. IoT communication module 5 (136) is the IoT device main controller 300, the state data such as vaporization gas content data detected by the vaporization gas recovery line 130, recovery data detected by the third flow meter, temperature data, pressure data, etc. To be sent).

The memory 138 temporarily or permanently stores state data such as vaporization gas content data detected by the third transfer pipe sensor 133, recovery amount data detected by the third flowmeter, temperature data, and pressure data.

The pump discharge line 140 is a pipe that discharges the liquefied gas to the target position in the liquefied gas pump 200 is composed of a double pipe to block the external heat to prevent natural vaporization. The pump discharge line 140 includes a fourth valve 141, a fourth transfer pipe sensor 143, and a fourth flow meter 145 for detecting the amount of liquefied gas discharged from the liquid gas pump 200. The fourth valve 141, the fourth transfer pipe sensor 143, and the fourth flow meter 145 of the pump discharge line 140 are controlled by the pump discharge line IoT device 142.

The fourth valve 141 blocks or supplies the liquefied gas discharged from the liquid gas pump 200 by the pump discharge line IoT device 142.

The fourth transfer pipe sensor 143 is installed in the space between the outer tube and the inner tube of the double pipe pump discharge line 140 to reduce the influence of the outside and the pipe. The fourth transfer pipe sensor 143 includes at least one vaporization gas content sensor. The vaporization gas content sensor detects the vaporization gas content contained in the liquefied gas flowing through the pump discharge line 140 in real time. Similarly, the vaporization gas content is not a digital value but an analog value set by an experiment. That is, the fourth transfer pipe sensor 143 artificially applies ultrasonic waves or vibration waves to the pump discharge line 140 to obtain ultrasonic waves or vibration waves changed according to the medium inside the pump discharge line 140. The changed ultrasonic wave or vibration wave is transmitted to the IoT device main controller 300 by the pump discharge line IoT device 142, and is compared with the preset reference vaporization gas content data to determine the abnormal vaporization content state.

The fourth flow meter 145 measures the amount of liquefied gas discharged through the pump discharge line 140. The liquefied gas amount data measured by the fourth flow meter 145 is transferred to the pump discharge line IoT device 142.

The pump discharge line IoT device 142 controls the fourth valve 141, the fourth transfer sensor 143, and the fourth flow meter 145 or receives and processes the detected data or transmits it to the outside. The pump discharge line IoT device 142 includes a programmable logic controller 6 (PLC6) 144, an IoT communication module 6 146, and a memory 148. The pump discharge line IoT device 142 receives the vaporization gas content data detected by the fourth transfer pipe sensor 143, transmits the vaporization gas content data to the IoT device main controller 300, and stores the data in the memory 148.

The PLC6 144 generally controls the components of the recovery line IoT device 142, for example, the IoT communication module 6 146 and the memory 148.

The IoT communication module 6 146 communicates with the IoT device main controller 300. IoT communication module 6 (146) is the IoT device main controller 300, the state data such as vaporization gas content data detected by the pump discharge line 140, liquefied gas emission data detected by the fourth flowmeter, temperature data, pressure data, etc. To be sent).

The memory 148 temporarily or permanently stores state data such as vaporized gas content data detected by the fourth transfer pipe sensor 143, liquefied gas discharge data detected by the fourth flowmeter, temperature data, and pressure data.

The pump discharge line 140 may be branched into a plurality of discharge branch lines 150-1 to 150-4 as necessary and transferred to the target position.

The IoT device main controller 300 collects and analyzes state data of each component of the liquefied gas pumping system 1 from the plurality of IoT devices 102, 202, 112, 122, 132, and 142, and controls signals on the plurality of IoT devices 102, 202, 112, 122, 132, and 142 according to the analysis result. Send it. Each IoT device 102, 202, 112, 122, 132, 142 controls a plurality of sensors 103, 203, 113, 123, 133, 143, a plurality of valves 111, 121, 131, 142, and a liquefied gas pump 200 according to a reception control signal. As illustrated in FIG. 2, the IoT device main controller 300 includes a first control unit 310, a first memory 320, a first communication module 330, a first UI unit 340, and a first display 350. It includes.

The first controller 310 generally controls the components of the IoT device main controller 300. The first controller 310 may include a central processing unit (CPU), a micro processing unit (MPU), application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), and programmable logic devices (PLDs). It may be implemented in hardware or software such as a control board including field programmable gate arrays (FPGAs), micro-controllers, microprocessors, and the like, and may be implemented in a combination of hardware and software. The first controller 310 may process various types of received and sensed state data received through a plurality of sensors 103, 203, 113, 123, 133, 143 through a communication or a network in software or hardware. have. The first control unit 310 may include an operating system (OS). In addition, the first controller 310 may include an application (program) that processes various types of input or processed information. The first controller 310 transmits a data acquisition setting message, a control signal, or the like inputted through the first UI unit 340 or requested by the user terminal 500 or a server (not shown) to each IoT device 102, 202, 112, 122, 132, or 142. The first control unit 310 may analyze the state data received from the IoT devices 102, 202, 112, 122, 132, and 142 to check the operation state of each liquefied gas pump, each liquefied gas transfer line state, and a vaporized gas recovery line state. For example, when the operating range of the liquefied gas pumping capacity of the liquefied gas pump 200 is set to a value such as an operating current (motor rotational speed) and a liquefied gas discharge flow rate, the first control unit 310 is a pump IoT device. State data of the liquefied gas pump 200 collected from the 202, the state data of the liquefied gas pump inflow line 120, the liquid gas flows into the liquefied gas pump 200 from the liquefied gas reservoir 100, liquefied gas pump State data of the vaporization gas recovery line 130 to recover the vaporized gas of the gas to the liquefied gas storage 100, the pump to discharge the liquefied gas pumped from the liquefied gas pump 200 to the target position (Target1 ~ 4) The liquefied gas pump 200 may be determined to be in a normal, overload, over-vibration, or overpressure state with reference to the state data of the discharge line 140. That is, after setting the operating range of the steady state in advance, the current state of the liquefied gas pump 20 is checked on the basis of the collected state data, and the cause of abnormality, that is, overload, overpressure, over vibration, Depending on the identified cause, each IoT device (102, 202, 112, 122, 132, 142) to control (block, adjust) each valve, or lower or stop the operating current of the pump. The first controller 310 analyzes the gaseous gas content state data detected by the sensors 113, 123, 133, and 134 of the liquid gas or gaseous gas transfer lines 110, 120, 130, and 140 with reference data, and determines whether or not abnormal vaporization is performed according to the determination result. It can cope by checking the abnormal vaporization position of the liquid gas or gaseous gas transfer line (110,120,130,140).

The first controller 310 includes an IoT middleware platform, a real-time event processing (CEP) engine, and an application service.

IoT middleware platform is a device manager to manage device and connection, device manager to manage device registration, list management, device status and configuration, and software to be provided to IoT device developers for each IoT device type and language. SDK Generator, an auto-generated development kit (SDK) library, System Manager with configuration and management capabilities of IoT platform itself, Notification manager as alert and notification service manager using push technology to IoT devices Manager), a configuration service manager that provides configuration changes, firmware updates, etc., using push technology to IoT devices, and configuration managers, and data that performs logging services for recording and storing data transmitted from IoT devices. It includes an event manager (Data Event Manager).

The CEP engine is a data steam manager as a classification processing manager of data received through real-time streaming, a topology as a data processing manager of real-time data, a stream manager of a system, and execution of a topperridge. Execution Manager as an integrated manager, and Clustering Manager as an integrated manager when using an engine clustering.

Application service is a service that monitors the status information of data generated from IoT devices in real time, and the status of dashboard service and IoT devices that provide monitoring data when a user's infant requests data from UI. After confirming that the user remotely controls some functions as a user request (UI) to control the control service to perform a service for controlling the device, for example, each valve, liquefied gas pump, each sensor through the IoT middleware ( Control Service).

The first communication unit 320 may communicate with the IoT devices 102, 202, 112, 122, 132, and 142 and the mobile device 500, 600. The first communication unit 320 is a data communication module such as VDSL, Ethernet, token ring, HDMI (high definiiom.ultimedia interface), USB, component, LVDS, HEC, 2G, 3G, 4G, Long Term Evolution (LTE) Mobile communication modules such as Wireless LAN (WLAN) (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access), etc. have.

The first memory 330 stores unlimited data. The first memory 330 is accessed by the first controller 310, and data, read, write, modify, delete, and update of the first memory 330 are performed. The data stored in the first memory 330 stores, for example, state data received from the IoT devices 102, 202, 112, 122, 132, and 142. Of course, the first memory 330 may include an operating system, various applications executable on the operating system, and the like. The first memory 230 may include a program (application) for processing and analyzing state data collected by the IoT devices 102, 202, 112, 122, 132, and 142.

The first memory 330 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory). Random Access Memory (RAM) Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM) magnetic memory, Magnetic It may include a storage medium of at least one type of disk, optical disk.

 The first UI unit 340 is an interface for receiving input from a user and includes various input devices such as a touch screen, a keyboard, a touch pad, and a mouse. The first UI unit 340 receives a user input for controlling the liquefied gas pump 200, the valves 111, 121, 131, and 141, and the sensors 103, 203, 113, 123, 133, and 143. The first UI unit 340 includes a graphic interface (GUI) output by various programs executed by the IoT device main controller 300 and displayed on the first display 350.

The first display 350 may display an image or graphic processed by an image processor (not shown) or a graphic processor (not shown). The first display 350 displays output images of various programs performed by the IoT device main controller 300 and image data sent from the IoT devices 102, 202, 112, 122, 132, and 142. The implementation method of the first display unit 350 is not limited, and may be implemented as an organic light emitting panel, a plasma display panel, or the like including a liquid crystal panel including a liquid crystal layer or a light emitting layer formed of an organic material.

The first display unit 350 may further include additional components according to the implementation manner. For example, the first display unit 350 may include a prism film, a polarizing film, an LCD cell, and a color filter according to a backlight, polarization characteristics, and light condensing characteristics in the case of a liquid crystal type.

The main manager mobile device 500 receives various raw data or analysis data received from the IoT device main controller 300 using the wired / wireless internet network 400. The main manager mobile device 500 displays or analyzes the received data to display the main manager. The main manager mobile device 500 transmits control signals for controlling the valves 111, 121, 131 and 141, the liquefied gas pump 200, and the sensors 103, 203, 113, 133, and 143 to the IoT device main controller 300 according to the instructions of the main manager. The main manager mobile device 500 receives the state data received from the IoT device main controller 300 to check the current state of the liquefied gas pump operation and each transfer line (110, 120, 130, 140, 150) and to enter the efficient operating range in case of abnormality. The valves 111, 121, 31, and 141, the liquefied gas pump 200, and the sensors 103, 203, 113, 133, and 143 are controlled. The main manager mobile device 500 may analyze state data by itself, or may receive only a result analyzed by the IoT device main controller 300 or a server (not shown).

The main manager mobile device 500 includes a second control unit 510, a second memory 520, a second communication module 530, a second UI unit 540, and a second display 550. Since the main manager mobile device 500 has a structure similar to that of the IoT device main controller 300, a description thereof will be omitted. When the main manager checks the abnormal information of the liquefied gas pumping system 1 based on the information collected from the IoT device main controller 300, the main manager delivers a message to the mobile device (not shown) of the sub manager (site manager). You can quickly process the state.

4 is a block diagram showing a test bed 1 'of a liquefied gas pumping system according to an exemplary embodiment of the present invention. The test bed 1 ′ of the liquefied gas pumping system is installed with the liquefied gas pump 200 and the transfer lines 110, 120, 130, and 140 in the same state as the actual liquefied gas pumping system 1. In the test bed 1 ′ of the liquefied gas pumping system, the pumping discharge line 140 of the liquefied gas pump 200 is connected to the liquefied gas reservoir 100 by feedback.

The test bed 1 ′ of the liquefied gas pumping system performs an operation test of the liquefied gas pump 200, a natural vaporization test, a vaporization gas recovery test, and a vaporization gas content verification test of each transfer line 110, 120, 130, and 140.

Referring to FIG. 4, a method of determining the degree of vaporization gas in the liquefied gas pump 200 without using a vaporization gas content sensor will be described.

The second flow meter 125 measures the amount of liquefied gas flowing into the liquefied gas pump 200 from the liquefied gas storage 100.

The liquefied gas pump 200 has a pump capacity (B) for accommodating liquid gas.

The fourth flow meter 145 measures the amount of pump discharged liquefied gas C discharged by being pumped out of the liquefied gas pump 200.

The pump inlet liquefied gas amount (A) is ideally the sum of the pump discharge capacity (B) plus the pump discharged liquefied gas amount (C) (A = B + C). However, since the liquefied gas passing through the second flow meter 125 is naturally vaporized in the liquefied gas pump 200, the value of the pump capacity liquefied gas (C) is actually larger than the pump capacity (B) (A). <B + C). Therefore, the amount of vaporized gas vaporized in the liquefied gas pump 200 is as much as the difference. Therefore, the difference in the amount of liquefied gas accumulated for a predetermined time is filled in the liquefied gas pump 200. The first controller 310 determines the vaporization gas level based on this, and opens the third valve 131 of the vaporization gas recovery line 130 when it exceeds the set range in consideration of the location of the vaporization gas recovery line 130. . The first controller 310 opens the third valve 131 when the amount of vaporized gas recovered through the third flowmeter 135 reaches the difference in the accumulated amount of liquefied gas. As such, by adjusting the timing for controlling the third valve 131 of the vaporization gas recovery line 130 of the present invention, it is possible to prevent inefficiency in which liquefied gas is recovered together with the vaporized gas recovered.

FIG. 5 is a diagram illustrating a state in which vaporized gas content sensors 203-1 and 203-2 for detecting vaporized gas levels are installed in the liquefied gas pump 200.

As shown, the vaporization gas content sensor 203 includes a vibration generating unit 203-1 and a plurality of waveform receivers 203-2. The vibration generator 203-1 and the waveform receiver 203-2 are installed between the inner case 214 and the outer case 212 of the double casing 210. The vibration generating unit 203-1 is installed on the outer wall of the inner case 214 to generate ultrasonic waves or vibration waves. The waveform receiver 203-2 is provided to face the vibration generator 203-1 above the outer wall of the inner case 214. Only one waveform receiver 203-2 may be installed, and a plurality of waveform receivers 203-2 may be installed side by side in the vertical direction. If only one is installed, the vibration generating unit 203-1 and the waveform receiving unit 203-2 should be inclined up and down. Ultrasonic or oscillating waves are longitudinal waves that vary in speed depending on the medium, ie, solid, liquid or gas. Accordingly, the waveform receiver 203-2 can clearly distinguish whether the medium in the liquefied gas pump 200 through which ultrasonic waves or vibration waves pass is gas or liquid. Therefore, in the test bed 1 ′ of the liquefied gas pumping system shown in FIG. 4, inherent in accordance with the gaseous gas content state through repeated experiments with various media (gas, liquid, mixed) in the liquefied gas pump 200. Get the waveform of The unique waveforms according to the gaseous gas content state are recorded in the database db as reference gaseous gas content state data. The state data measured by the actual liquefied gas pumping system 1 is compared with the reference gaseous gas-containing state data recorded in the database db to determine the vaporized gas level in the liquefied gas pump 200.

The reference gaseous gas content data can be differently set according to the gaseous gas content measured by dividing it into warning gaseous gas content state warning to the manager and pump stop gaseous gas content state stopping the liquefied gas pump. have.

 It is possible to confirm a clearer vaporized gas level by applying the measured value of the flowmeter and the liquefied gas pump capacity to the vaporized gas determined by the vaporized gas content sensors 203-1 and 203-2 described above.

In the liquefied gas pumping system 1 installed on-site, it is common to omit the fourth flow meter 145 in the pump discharge line 140. That is, the amount of liquefied gas pumped by the liquefied gas pump 200 is determined as the amount of liquefied gas detected by the second flow meter 125 installed in the pump inflow line 220. However, since the actual liquefied gas pump 200 pumps in a state in which the amount of vaporized gas or liquefied gas recovered through the vaporized gas recovery line 250 is insufficient, the consumer suffers a loss. Therefore, the amount of liquefied gas supplied to the consumer through the liquefied gas pump 200 should exclude the amount of vaporized gas or liquefied gas recovered through the vaporized gas recovery line 250 from the liquefied gas amount detected by the second flowmeter 125. As a result, the control of the third valve 135 of the vaporization gas recovery line 130 considering the vaporization gas level in the liquefied gas pump 200 has a commercially important meaning.

In FIG. 5, the vibration generating unit 203-1 and the wave receiving unit 203-2 should be installed away from the center to the side because the pumping discharge pipe 248 must be avoided.

FIG. 6 is a view illustrating a state in which the second gaseous gas content sensors 143-1 and 143-2 are installed in the test bed 1 ′ to obtain reference gaseous gas content state data in the pump discharge line 140.

 The pump discharge line 140 is composed of an outer tube 140-1 and an inner tube 140-2 spaced apart from each other as a double tube. The vacuum between the exterior 140-1 and the inner tube 140-2 minimizes thermal conduction.

The second gaseous gas content sensor 143-1 and 143-2 generates a ultrasonic wave or a vibration wave and supplies the vibration generator 143-1 to the inner tube 140-2 and a waveform receiver for receiving the ultrasonic wave or the vibration wave ( 143-2). The vibration generating unit 143-1 and the waveform receiving unit 143-2 are interposed between the exterior 140-1 and the inner tube 140-2, but are installed in the exterior 140-2 in a non-contact state. The vibration generating unit 143-1 is installed above the inner tube 140-2, and the wave receiving unit 143-2 is installed below the vibration generating unit 143-1.

Since the second vaporization gas content sensor (143-1, 143-2) is installed in the double pipe for the heat shield, the waveform receiver 143-2 is disposed together with the pump discharge line IoT device 142.

The vibration generating unit 143-1 and the wave receiving unit 143-2 are disposed to face each other at the center of the ring-shaped substrate 149. The substrate 149 is freely rotatable in the guide groove 148 formed on the outer circumferential surface of the inner tube 140-2. Further, the load on the wave receiving portion 143-2 is set to be greater than the load on the vibration generating portion 143-1. Since the pump discharge line 140 is not always installed to separate the top and bottom during construction, it can be seen that the second vaporization gas content sensor (143-1, 143-2) installed on the outer circumferential surface of the inner pipe (140-2) is installed up and down. none. The second vaporization gas content sensors 143-1 and 143-2 of the present invention are always disposed up and down by the load of the substrate 149 and the heavy waveform receiver 143-2 that rotate freely in the guide groove 148. To be able.

The pump discharge line 140 of the test bed 1 'is provided with a second vaporization gas containing sensor 143- to vaporize a part of the liquefied gas passing through the pump discharge line 140 by supplying heat artificially and stepwise. And a vaporization apparatus 147 provided upstream of 1,143-2.

As the vaporizer 147 supplies heat step by step, the amount of vaporized gas contained in the pump discharge line 140 is added in each step. The vaporization gas added by the vaporization device 147 may be confirmed by the fourth flow meter 145 of the pump discharge line 140. In addition, since the pump discharge line 140 is finally connected to the liquefied gas reservoir 100 in the test bed 1 ′ of FIG. 4, the amount of vaporized gas increased in the liquefied reservoir 100 may be confirmed.

The vibration generating unit 143-1 supplies ultrasonic waves or vibration waves for each vaporized gas amount of the vaporization device 147, and the waveform receiving unit 143-2 measures the waveform passing through the liquefied gas containing the vaporized gas amount for each step. Register as standard gaseous gas content status data. The registered reference gaseous gas content state data is compared with the gaseous gas content state data detected by the gaseous gas content sensor 113, 123, 133, 143 installed in each liquefied gas transfer line of the actual liquefied gas pumping system (1). . In this way, the gaseous gas content state data is the low data of the analog waveform instead of the digital value. Of course, it is also possible to convert raw waveforms into digital values for analog waveforms.

As a result, the vaporization gas content sensors 113, 123, 133, and 143 installed in each liquefied gas transfer line of the liquefied gas pumping system 1 determine the degree of vaporization gas content of the liquefied gas passing through to determine the abnormal vaporization position or the cause of vaporization. Valid.

7 is a flowchart showing a control method of the liquefied gas pumping system 1 according to the embodiment of the present invention.

In step S11, through repeated experiments by the test bed 1 'of FIGS. 4 and 5, reference gaseous gas level state data for determining various gaseous gas levels of the liquefied gas pump 200 is set and recorded.

In step S12, the gaseous gas level state data is measured in real time by the vaporization gas content sensor 203 installed in the liquefied gas pump 200 of the liquefied gas pumping system 1.

In step S13, the gaseous gas level in the liquefied gas pump is determined by comparing the measured gaseous gas level state data of step S12 with the reference reference gaseous gas level state data.

In step S14, it is confirmed whether the crystallization gas level in step S14 exceeds a predetermined range.

In step S15, when the determined vaporization gas level exceeds the predetermined range, the third valve 135 of the vaporization gas line 130 is opened to recover the vaporization gas. If the determined gaseous gas level falls below a predetermined range, the gaseous gas level state data is continuously measured in real time.

In step S16, the amount of liquefied gas flowing into the liquefied gas pump 200 and the amount of liquefied gas discharged from the liquefied gas pump 200 are measured.

In step S17, after calculating the difference between the amount of liquefied gas (A) flowing into the liquefied gas pump 200 and the amount of liquefied gas (B) discharged from the liquefied gas pump 200, the amount of vaporized gas considering the storage capacity of the liquefied gas pump Calculate

In step S18, it is determined whether the calculated amount of vaporized gas is within the set range.

In step S19, if the amount of vaporized gas is normal, the valve of the vaporized gas return valve is opened to recover the vaporized gas. If abnormal, the liquefied gas pump 200 is stopped and a message is notified to the manager.

8 is a flowchart illustrating a control method of a liquefied gas pumping system according to another exemplary embodiment of the present invention.

In step S21, through the repeated test by the test bed (1 ') of Fig. 4 and 6, the reference vaporized gas to determine the various vaporization gas content of the pump 200 passing through each liquefied gas transfer line (110, 120, 130, 140) Set and record the containment status data.

In step S22, the gaseous gas content state data is measured in real time by the gaseous gas content sensor 113, 123, 133, 143 installed in each liquefied gas transfer line (110, 120, 130, 140) of the liquefied gas pumping system (1).

In step S23, the measured gaseous gas content state data and the preset reference gaseous gas content state data are compared and analyzed to determine a matched gaseous gas content state.

In step S24, in the case of abnormal vaporization out of a predetermined range in consideration of the determined gaseous gas containing state, a message is notified to a manager of a corresponding position, a valve of the transfer line is shut off, or the liquefied gas pump 200 is stopped.

As described above, the present invention has been described through limited exemplary embodiments and drawings, but the present invention is not limited to the exemplary embodiments described above, and those skilled in the art to which the present invention pertains can various Modifications and variations are possible.

Therefore, the scope of the present invention should not be limited to the exemplary embodiments described, but should be defined not only by the claims below but also by the equivalents of the claims.

1: liquefied gas pumping system
100: liquefied gas storage
110: liquefied gas tank supply line
120: liquefied gas pump inlet line
130: vaporized gas recovery line
140: pump discharge line
150-1 ~ 150-4: Discharge branch line
200: liquefied gas pump
210: Gaussing
220: suction line
230: pump assembly
240: pumping line
250: return line
300: IoT device main controller
400: Internet network
500: main administrator mobile device

Claims (5)

In a liquefied gas pumping system,
Liquefied gas storage for storing liquefied gas
A liquefied gas pump for pumping the liquefied gas from the liquefied gas reservoir to a target position;
A liquefied gas inlet line which connects between the liquefied gas reservoir and the liquefied gas pump and has a first meter to measure the amount of influent liquefied gas A;
A liquefied gas pump discharge line having a second meter for connecting the liquefied gas pumped by the liquefied gas pump to a target position and measuring a discharged liquefied gas amount (B);
And a controller for comparing the discharged liquefied gas amount (B) with the introduced liquefied gas amount (A) to determine the amount of vaporized gas in the liquefied gas pump.
A liquefied gas recovery line connecting the liquefied gas pump and the liquefied gas reservoir to recover the vaporized gas of the liquefied gas pump and having a valve disposed between the liquefied gas pump and the liquefied gas reservoir,
The control unit controls the valve of the vaporization gas recovery line based on the determined amount of vaporization gas,
And a vaporization gas-containing sensor including a vibration generation unit generating vibrations on an upper end of an outer wall of the liquefied gas pump and a plurality of waveform receivers disposed opposite and vertically spaced apart from the vibration generation unit.
The controller determines a vaporized gas level in the liquefied gas pump by comparing the waveforms received by the plurality of waveform receivers with a preset reference waveform according to a waveform passing medium.
The controller determines the amount of vaporized gas in the liquefied gas pump with reference to the capacity (C) of the liquefied gas pump,
The liquefied gas pump discharge line includes an inner tube and an outer tube, and a second gas gas containing sensor provided between the inner tube and the outer tube,
The second vaporization gas-containing sensor is a liquefied gas pumping system comprising a vibration generating unit and a wave receiving unit mounted to face each other on a substrate rotatably provided on the outer peripheral surface of the inner tube. delete delete delete delete

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