Gasification gas liquefaction facility, gaseous fuel supply system, and gasification gas liquefaction method

Abstract

A vaporized gas liquefaction facility according to one embodiment of the present disclosure is provided with: a liquefied gas tank for storing liquefied gas; and a micronization nozzle for micronizing the gasified gas and discharging the gasified gas as bubbles into the liquefied gas stored in the liquefied gas tank.

Description

Technical Field

[0001] The present disclosure relates to a vaporized gas liquefaction device, a gas fuel supply system, and a vaporized gas liquefaction method. Background Art

[0002] Patent Document 1 listed below discloses a device that cools residual hydrogen vapor discharged from an ejector using a heat exchanger and releases the cooled hydrogen vapor into liquid hydrogen in a receiving tank.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Publication No. 63-5322 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] When the vaporized gas is released into the liquefied gas stored in the liquefied gas tank, the vaporized gas is cooled by the liquefied gas and partially liquefied. If the vaporized gas can be efficiently liquefied in the liquefied gas tank, the increase in the internal pressure of the liquefied gas tank can be suppressed, which is preferable.

[0008] An object of the present disclosure is to provide a vaporized gas liquefaction facility capable of efficiently liquefying vaporized gas in a liquefied gas tank.

[0009] Means for solving problems

[0010] A vaporized gas liquefaction facility according to one embodiment of the present disclosure includes a liquefied gas tank storing liquefied gas, and an atomizing nozzle atomizing the vaporized gas and releasing the atomized gas as bubbles into the liquefied gas stored in the liquefied gas tank.

[0011] Effects of the Invention

[0012] According to the vaporized gas liquefaction equipment of one embodiment of the present disclosure, the vaporized gas can be efficiently liquefied in the liquefied gas tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a block diagram of a gas fuel supply system. DETAILED DESCRIPTION

[0014] Hereinafter, embodiments will be described. Figure 1 FIG is a block diagram of the gas fuel supply system 100. Figure 1As shown, the gas fuel supply system 100 includes a liquefied gas tank 11, a supply line 12, a pressure pump 13, a heater 14, a return line 15, an ejector 16, a gas-liquid separator 17, and a micronizing nozzle 18. Furthermore, the vaporized gas liquefaction equipment 10 of this embodiment includes the liquefied gas tank 11, the ejector 16, the gas-liquid separator 17, and the micronizing nozzle 18, among the aforementioned components. Each component will be described below in order.

[0015] The liquefied gas tank 11 is a tank for storing liquefied gas. Examples of liquefied gas include liquefied hydrogen, liquefied natural gas (LNG), and liquefied petroleum gas (LPG). The liquefied gas tank 11 includes a liquid phase portion 21 filled with liquefied gas and a gas phase portion 22 filled with vaporized gas from the liquefied gas. In the liquefied gas tank 11, when the internal pressure rises and exceeds the allowable value, a portion of the vaporized gas is discharged from the gas phase portion 22. Typically, the vaporized gas discharged from the liquefied gas tank 11 is disposed of by being released into the atmosphere or incinerated. Therefore, in order to avoid wasteful consumption of gas fuel, it is also preferable to suppress the internal pressure of the liquefied gas tank 11.

[0016] The supply line 12 connects the liquefied gas tank 11 to the gas fuel unit 101. The gas fuel unit 101 is a device that uses vaporized gas as fuel, such as a gas engine or boiler. The supply line 12 draws liquefied gas from the liquid phase 21 of the liquefied gas tank 11, converts the drawn liquefied gas into vaporized gas, and supplies it to the gas fuel unit 101 as gas fuel.

[0017] The pressure pump 13 is located in the supply line 12 and is a pump that pressurizes the liquefied gas obtained from the liquefied gas tank 11. The pressure pump 13 may be composed of multiple pumps or a single pump. For example, the pressure pump 13 may include a low-pressure pump and a high-pressure pump that further pressurizes the liquefied gas pressurized by the low-pressure pump.

[0018] The heater 14 is located in the supply line 12 and is a device that heats the liquefied gas. In this embodiment, the heater 14 is located in the supply line 12 downstream of the pressure pump 13. Therefore, the heater 14 heats the liquefied gas pressurized by the pressure pump 13. The liquefied gas heated by the heater 14 is converted into vaporized gas and supplied to the gas fuel unit 101.

[0019] The return line 15 is connected to the supply line 12. In this embodiment, the return line 15 is connected to a portion of the supply line 12 downstream of the pressure pump 13 and upstream of the heater 14. The remaining liquefied gas pressurized by the pressure pump 13 that is not supplied to the gas fuel unit 101 flows into the return line 15. A relief valve 23 is located in the return line 15. The liquefied gas flowing into the return line 15 is converted into vaporized gas after passing through the relief valve 23. If most of the vaporized gas generated in the return line 15 can be liquefied and returned to the liquefied gas tank 11, the internal pressure of the liquefied gas tank 11 can be suppressed, thereby preventing wasteful consumption of gas fuel.

[0020] The ejector 16 is a device that mixes the vaporized gas taken in from two different pipelines. The ejector 16 of this embodiment takes in the vaporized gas generated in the return pipeline 15 (hereinafter referred to as "return vaporized gas") and takes in the vaporized gas in the liquefied gas tank 11 (hereinafter referred to as "tank vaporized gas"), and mixes them. By ejecting the return vaporized gas from the internal nozzle inside the ejector 16, a decompression section is formed using the Venturi effect. The tank line 24 extending from the liquefied gas tank 11 is connected to the decompression section of the ejector 16, and the tank vaporized gas is sucked into the ejector 16 via the tank line 24. As a result, the return vaporized gas and the tank vaporized gas are taken into the ejector 16 and mixed.

[0021] The return vaporized gas and tank vaporized gas mixed in the ejector 16 further expand through the internal diffuser within the ejector 16, partially liquefying. Thus, the ejector 16 discharges a fluid containing vaporized gas and liquefied gas, namely, a gas-liquid two-phase fluid. The vaporized gas and liquefied gas discharged from the ejector 16 are supplied to the gas-liquid separator 17 via the gas-liquid line 25 connecting the ejector 16 and the gas-liquid separator 17. Alternatively, the gas fuel supply system 100 may include a pressure-reducing expansion valve, in place of the ejector 16, that reduces the pressure and liquefies the vaporized gas generated in the return line 15. In this case, the return vaporized gas and the tank vaporized gas do not mix.

[0022] The gas-liquid separator 17 is a device that separates the gasified gas from the liquefied gas. The gas-liquid separator 17 of this embodiment separates the gasified gas and the liquefied gas discharged from the ejector 16 by utilizing the difference in specific gravity. However, the gas-liquid separator 17 may not have the structure described above, and the form of the gas-liquid separator 17 is not limited. The gasified gas separated from the liquefied gas is supplied to the micronizing nozzle via the gas pipeline 26. On the other hand, the liquefied gas separated from the gasified gas is supplied to the liquefied gas tank 11 via the liquid pipeline 27. In addition, the liquefied gas separated from the gasified gas can be supplied to the liquid phase portion 21 of the liquefied gas tank 11, or it can be supplied to the gas phase portion 22.

[0023] The atomizing nozzle 18 is located in the liquid phase portion 21 of the liquefied gas tank 11 and releases vaporized gas into the liquefied gas stored in the tank 11. By releasing the vaporized gas into the liquefied gas, the released vaporized gas is cooled by the surrounding liquefied gas and liquefied. Efficiently liquefying the vaporized gas within the liquefied gas tank 11 can suppress the internal pressure of the tank 11 and prevent wasteful consumption of gas fuel.

[0024] Therefore, the micronizing nozzle 18 of the present embodiment micronizes the gasified gas and releases it into the liquefied gas as bubbles. By making the gasified gas into microscopic bubbles, the surface area of ​​the gasified gas in contact with the liquefied gas increases and is easily liquefied. In addition, in the present embodiment, the bubbles released into the liquefied gas include bubbles with a diameter of less than 100 μm. The diameter of the bubbles released into the liquefied gas may also be less than 100 μm in terms of Sauter's average. Bubbles with a diameter of less than 100 μm have the characteristic of not being easy to float in the liquid. Therefore, the gasified gas released into the liquefied gas as bubbles with a diameter of less than 100 μm remains in the liquefied gas for a long time, and as a result, is easily liquefied. In addition, the bubbles released into the liquefied gas may also include micron bubbles with a diameter of 1 μm or more and less than 100 μm, and may also include ultrafine bubbles with a diameter of less than 1 μm.

[0025] In addition, the micronizing nozzle 18 of this embodiment includes a porous material 28 located in the flow path of the vaporized gas. The vaporized gas is micronized by passing through the porous material 28. The porous material 28 includes, for example, a material having a plurality of pores inside, a material formed by overlapping fibers, a material formed by sintering fine metal particles into a whole, and the like. In addition, the micronizing nozzle 18 can also be a method of micronizing the vaporized gas by adding the vaporized gas to the liquefied gas ejected at high speed. However, the micronizing nozzle 18 of this embodiment uses the porous material 28 to micronize the liquefied gas, and thus can suppress the speed of the vaporized gas released from the micronizing nozzle 18. As a result, the liquefied gas in the liquefied gas tank 11 is not easily stirred, and the vaporized gas can be liquefied more efficiently.

[0026] As described above, the vaporized gas supplied to the miniaturizing nozzle 18 of this embodiment is vaporized gas separated from liquefied gas by the gas-liquid separator 17. Therefore, the inflow of liquefied gas into the porous material 28 of the miniaturizing nozzle 18 can be suppressed, and clogging of the porous material 28 by the liquefied gas can be suppressed. Furthermore, by supplying the vaporized gas to the miniaturizing nozzle 18 via the gas-liquid separator 17, the velocity of the vaporized gas supplied to the miniaturizing nozzle 18 can be suppressed, thereby preventing the liquefied gas within the liquefied gas tank 11 from being agitated.

[0027] Summary

[0028] A first aspect disclosed in this specification is a vaporized gas liquefaction facility including: a liquefied gas tank storing liquefied gas; and an atomizing nozzle atomizing the vaporized gas and releasing the atomized gas as bubbles into the liquefied gas stored in the liquefied gas tank.

[0029] According to this configuration, since the surface area of ​​the vaporized gas in contact with the liquefied gas increases, the vaporized gas can be efficiently liquefied in the cooled liquefied gas tank.

[0030] Item 2 disclosed in this specification is the vaporized gas liquefaction equipment according to Item 1, wherein the bubbles include bubbles having a diameter of less than 100 μm.

[0031] According to this configuration, the vaporized gas stays in the liquefied gas for a long period of time, and thus the vaporized gas can be liquefied more efficiently in the liquefied gas tank.

[0032] Item 3 disclosed in this specification is the vaporized gas liquefaction equipment according to Item 1 or 2, wherein the atomizing nozzle includes a porous material that is atomized by passing the vaporized gas therethrough.

[0033] According to this configuration, since the liquefied gas in the liquefied gas tank is less likely to be stirred, the vaporized gas can be liquefied more efficiently.

[0034] Item 4 disclosed in this specification is the vaporized gas liquefaction equipment according to Item 3, wherein the vaporized gas liquefaction equipment further comprises a gas-liquid separator for separating the vaporized gas and the liquefied gas, and the atomizing nozzle atomizes the vaporized gas separated from the liquefied gas by the gas-liquid separator.

[0035] According to this structure, clogging of the porous material can be suppressed.

[0036] Item 5 disclosed in this specification is the vaporized gas liquefaction equipment according to Item 4, further comprising an ejector for expanding and liquefying the vaporized gas, wherein the gas-liquid separator separates the vaporized gas and liquefied gas discharged from the ejector.

[0037] According to this configuration, in addition to liquefaction of the vaporized gas in the liquefied gas tank, liquefaction of the vaporized gas by the ejector can also be performed simultaneously.

[0038] Item 6 disclosed in this specification is a gas fuel supply system, which comprises: a liquefied gas tank that stores liquefied gas; a supply pipeline that connects the liquefied gas tank and a gas fuel mechanism; a pressure pump that is located in the supply pipeline and pressurizes the liquefied gas; a return pipeline that is connected to a portion of the supply pipeline downstream of the pressure pump; an ejector that expands the vaporized gas generated in the return pipeline and liquefies a portion of it; a gas-liquid separator that separates the vaporized gas and liquefied gas discharged from the ejector; and a micronizing nozzle that micronizes the vaporized gas separated from the liquefied gas by the gas-liquid separator and releases it as bubbles into the liquefied gas stored in the liquefied gas tank.

[0039] According to this configuration, the surface area of ​​the vaporized gas in contact with the liquefied gas in the liquefied gas tank increases, and thus the vaporized gas can be efficiently liquefied.

[0040] The seventh item disclosed in this specification is a method for liquefying a vaporized gas, wherein the vaporized gas is pulverized and released as bubbles into liquefied gas stored in a liquefied gas tank.

[0041] According to this method, the surface area of ​​the vaporized gas in contact with the liquefied gas increases, and thus the vaporized gas can be efficiently liquefied in the liquefied gas tank.

[0042] Label Description

[0043] 10: Gasification gas liquefaction equipment; 11: Liquefied gas tank; 12: Supply pipeline; 13: Pressure pump; 14: Heater; 15: Return pipeline; 16: Ejector; 17: Gas-liquid separator; 18: Micronizing nozzle; 28: Porous material; 100: Gas fuel supply system; 101: Gas fuel mechanism.

Claims

1. A gasification gas liquefaction device, comprising: Liquefied gas tanks, which store liquefied gas; and The atomizing nozzle atomizes the vaporized gas and releases the atomized gas as bubbles into the liquefied gas stored in the liquefied gas tank.

2. The gasification gas liquefaction equipment according to claim 1, wherein: The bubbles include bubbles having a diameter of less than 100 μm.

3. The gasification gas liquefaction equipment according to claim 1 or 2, wherein: The atomizing nozzle includes a porous material that is atomized by passing a vaporized gas therethrough.

4. The gasification gas liquefaction equipment according to claim 3, wherein: The gasified gas liquefaction equipment also has a gas-liquid separator for separating the gasified gas and the liquefied gas. The atomizing nozzle atomizes the vaporized gas separated from the liquefied gas by the gas-liquid separator.

5. The gasification gas liquefaction equipment according to claim 4, wherein: The gasified gas liquefaction equipment further comprises an ejector for expanding and liquefying the gasified gas. The gas-liquid separator separates the vaporized gas and the liquefied gas discharged from the ejector.

6. A gas fuel supply system comprising: Liquefied gas tanks, which store liquefied gas; a supply line connecting the liquefied gas tank and a gas fuel mechanism; a pressure pump located in the supply line and pressurizing the liquefied gas; a return line connected to a portion of the supply line downstream of the booster pump; an ejector that expands the vaporized gas generated in the return line to liquefy a portion thereof; a gas-liquid separator for separating the gasified gas and the liquefied gas discharged from the ejector; as well as The atomizing nozzle atomizes the vaporized gas separated from the liquefied gas by the gas-liquid separator and releases the atomized gas as bubbles into the liquefied gas stored in the liquefied gas tank.

7. A method for liquefying gas, wherein: The vaporized gas is pulverized and released as bubbles into the liquefied gas stored in the liquefied gas tank.

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