JP-7856879-B2 - Liquefied gas filling system and method for filling liquefied gas

Inventors

• 川邊 卓也
• 平岡 琢磨
• 山口 則和
• 熊本 佳史

Assignees

• 日本酸素株式会社

Dates

Publication Date

20260512

Application Date

20240328

Claims (10)

1. A storage tank for storing liquefied gas, A filling tank for filling with liquefied gas, A supply line connected to the storage tank and the filling tank, which supplies liquefied gas from the storage tank to the filling tank, One or more bypass lines connected to the supply line, The supply line and each of the one or more bypass lines are provided with a compressor for discharging the liquefied gas , The one or more bypass lines are connected in the supply line, with one end connected to the inlet side of the compressor provided in the supply line and the other end connected to the outlet side of the compressor provided in the supply line. A liquefied gas filling system in which the maximum amount of liquefied gas to be filled from the storage tank to the filling tank is 100 tons/hr or more.
2. The liquefied gas filling system according to claim 1, wherein the supply line has a fluid density measuring means between the connection point between the supply line and the bypass line at the outlet side of the compressor provided in the supply line and the filling tank.
3. The liquefied gas filling system according to claim 1 or 2, wherein the filling tank has a liquid volume measuring means for measuring the liquid volume of the filled liquefied gas.
4. The liquefied gas filling system according to claim 1 or 2, comprising a pressure equalization line connected to the storage tank and the filling tank for equalizing the pressure between the storage tank and the filling tank.
5. A method for filling a filling tank with liquefied gas, comprising filling a filling tank from a storage tank with liquefied gas through a supply line and one or more bypass lines connected to the supply line, A supply line cooling step involves supplying liquefied gas from the storage tank through the supply line connected to the filling tank and cooling the supply line, A filling step includes operating a compressor for dispensing the liquefied gas provided in the supply line and at least one of the compressors for dispensing the liquefied gas provided in one or more bypass lines, and filling the filling tank from the storage tank through the supply line and one or more bypass lines connected to the supply line, A method for filling a liquefied gas, wherein the maximum amount of liquefied gas to be filled from the storage tank to the filling tank is 100 tons/hr or more.
6. The method for filling a liquefied gas according to claim 5, further comprising a pressure equalization step, prior to the supply line cooling step, in which the storage tank and the filling tank are brought to a pressure equalization level through a pressure equalization line connected to the storage tank and the filling tank.
7. The method for filling with liquefied gas according to claim 5 or 6, wherein, in the supply line cooling step, when the flow rate of the liquefied gas measured by a flow meter installed in the supply line falls below a predetermined value, the compressor installed in the supply line is activated to increase the flow rate.
8. The method for filling liquefied gas according to claim 5 or 6, wherein, in the filling step, after confirming that the liquefied gas in the supply line has liquid density by a fluid density measuring means provided between the connection point between the supply line and the one or more bypass lines at the outlet side of the compressor provided in the supply line and the filling tank, at least one of the compressors provided in each of the one or more bypass lines is activated to fill the filling tank with liquefied gas from the storage tank.
9. The method for filling liquefied gas according to claim 8, wherein when the liquid volume in the filling tank, as measured by a liquid volume measuring means provided in the filling tank, reaches 80% by volume or more, the compressors provided in one or more bypass lines are sequentially stopped.
10. The method for filling a liquefied gas according to claim 8, wherein all compressors are stopped when the liquid volume in the filling tank reaches 90% by volume or more.

Description

This invention relates to a liquefied gas filling system and a method for filling with liquefied gas. Traditionally, liquefied gases such as liquefied carbon dioxide and liquefied petroleum gas have been filled from tank to tank. For example, liquefied gas is transferred from a tank truck's tank to a tank intended for liquefied gas storage. During such filling, the compressor is typically operated at high speed from the start of filling to fill the tank with liquefied gas. The amount of gas filled is then monitored by an operator using a measuring device, and once the predetermined amount is reached, the operator manually stops the compressor to complete the filling process. For example, Patent Document 1 discloses a liquefied petroleum gas filling apparatus comprising a liquid transfer line connecting the liquid phase of a tanker tank and the gas phase of a bulk container via a pump, and a gas phase line connecting the gas phases of the tanker tank and the bulk container. Furthermore, when filling the tank with liquefied gas, the flow rate of the liquefied gas is controlled by controlling a valve. For example, Patent Document 2 discloses a liquefied gas filling system comprising: a liquefied gas filling path, one end of which is connected to the liquid phase region of a liquefied gas storage tank and the other end of which is connected to the liquid phase region of a fuel tank; a gas phase region equalization path, one end of which is connected to the gas phase region of the liquefied gas storage tank and the other end of which is connected to the gas phase region of the fuel tank; pressurizing means for supplying the liquefied gas in the liquefied gas storage tank to the fuel tank by pressurizing the liquefied gas; a filling on/off valve arranged in the liquefied gas filling path; an equalization on/off valve arranged in the gas phase region equalization path; receiving means for receiving liquid level detection data transmitted by the transmitting means; a filling start operation unit operated when starting to fill the liquefied gas from the liquefied gas storage tank to the fuel tank; and control means for controlling the amount of liquefied gas to be filled into the fuel tank. Japanese Patent Publication No. 2000-291889Japanese Patent Publication No. 2010-255809 This is a schematic diagram of a liquefied gas filling system according to the first embodiment of the present invention.This is a schematic diagram of a liquefied gas filling system according to a second embodiment of the present invention.This is a flowchart (1) illustrating the method of filling with liquefied gas according to the first embodiment using the liquefied gas filling system shown in Figure 1.This is a flowchart (2) illustrating the method of filling with liquefied gas according to the first embodiment using the liquefied gas filling system shown in Figure 1.This is a flowchart (3) illustrating the method of filling with liquefied gas according to the first embodiment using the liquefied gas filling system shown in Figure 1.This is a flowchart (1) illustrating the method of filling with liquefied gas according to the second embodiment using the liquefied gas filling system shown in Figure 2.This is a flowchart (2) illustrating the method of filling with liquefied gas according to the second embodiment using the liquefied gas filling system shown in Figure 2.This is a flowchart (3) illustrating the method of filling with liquefied gas according to the second embodiment using the liquefied gas filling system shown in Figure 2. The liquefied gas filling system and liquefied gas filling method of the present invention will be described in detail below, based on embodiments and with reference to the drawings. Note that the drawings are for illustrative purposes only and may differ from actual dimensions. In this specification, the notation "a to b" in descriptions of numerical ranges, unless otherwise specified, indicates a range of a or greater and b or less. <Liquefied Gas Filling System> [First Embodiment] Figure 1 is a schematic diagram of a liquefied gas filling system 1 according to the first embodiment of the present invention. As shown in Figure 1, the liquefied gas filling system 1 according to the first embodiment includes a storage tank 2 for storing liquefied gas, a filling tank 3 for filling with liquefied gas, a supply line 4 connected to the storage tank 2 and the filling tank 3 for supplying liquefied gas from the storage tank 2 to the filling tank 3, one or more bypass lines 5 connected to the supply line 4, and compressors 6 provided on each of the supply line 4 and the one or more bypass lines 5. In the liquefied gas filling system 1, one or more bypass lines 5 have one end connected to the inlet side of the compressor 6 provided on the supply line 4, and the other end connected to the outlet side of the compressor 6 provided on the supply line 4. The maximum amount of liquefied gas to be filled from the storage tank