JP-2026075232-A - Liquid fuel-using equipment, floating structures, and operating methods for liquid fuel-using equipment

JP2026075232AJP 2026075232 AJP2026075232 AJP 2026075232AJP-2026075232-A

Abstract

[Problem] To easily reuse liquid fuel discharged by purging. [Solution] The liquid fuel usage equipment comprises a fuel tank having a fuel storage space, a combustion device driven by liquid fuel, a fuel supply line that supplies liquid fuel from the fuel tank to the combustion device, a purge liquid supply unit capable of supplying a purge liquid soluble in the liquid fuel to the liquid fuel flow path, a recovery line that recovers the discharge liquid pushed out from the liquid fuel flow path by the supply of purge liquid by the purge liquid supply unit, a recovery tank having a liquid storage space capable of storing the discharge liquid recovered through the recovery line, and a mixing line that mixes the discharge liquid in the recovery tank with the liquid fuel supplied to the combustion device through the fuel supply line, wherein the horizontal cross-sectional area of the fuel storage space at the same height in the vertical direction is larger than the horizontal cross-sectional area of the liquid storage space. [Selection Diagram] Figure 3

Inventors

徳田圭晃

Assignees

三菱造船株式会社

Dates

Publication Date: 20260508
Application Date: 20241022

Claims (11)

A fuel tank having a fuel storage space capable of storing liquid fuel, A combustion device driven by the aforementioned liquid fuel, A fuel supply line that supplies the liquid fuel in the fuel tank to the combustion device, A purge liquid supply unit capable of supplying a purge liquid soluble in the liquid fuel to the liquid fuel flow path, A recovery line for recovering the discharge liquid pushed out of the liquid fuel passage by the supply of the purge liquid by the purge liquid supply unit, A recovery tank having a liquid storage space capable of storing the discharged liquid recovered through the recovery line, A mixing line for mixing the discharged liquid in the recovery tank with the liquid fuel supplied to the combustion device through the fuel supply line, Equipped with, Liquid fuel usage equipment in which the horizontal cross-sectional area of the fuel storage space at the same vertical height is larger than the horizontal cross-sectional area of the liquid storage space.
The liquid fuel usage equipment according to claim 1, wherein the ratio of the horizontal cross-sectional area of the liquid storage space to the horizontal cross-sectional area of the fuel storage space at the same vertical height is set to be less than or equal to the upper limit mixing ratio of the discharge liquid to the liquid fuel that can be burned by the combustion device.
The liquid fuel usage equipment according to claim 1 or 2, wherein, in the vertical direction, the entire liquid storage space is located within the range in which the fuel storage space is arranged.
The liquid fuel usage equipment according to claim 3, wherein the fuel storage space of the fuel tank extends upward in the vertical direction compared to the liquid storage space of the recovery tank.
The liquid fuel usage equipment according to claim 3, wherein the fuel storage space of the fuel tank extends downward in the vertical direction compared to the liquid storage space of the recovery tank.
The liquid fuel usage equipment according to claim 1 or 2, further comprising a check valve provided in the mixing line to suppress the backflow of the liquid fuel from the fuel supply line side to the recovery tank side.
The liquid fuel usage equipment according to claim 1 or 2, further comprising a power valve provided in the mixing line for allowing the discharged liquid that has passed through the mixing line to flow into the fuel supply line when the liquid level in the fuel tank is at or above the liquid level in the recovery tank.
The aforementioned purge liquid supply unit is, A purge liquid storage tank for storing the aforementioned purge liquid, A purge liquid supply line that supplies the purge liquid in the purge liquid storage tank to the liquid fuel flow path, A liquid fuel-using apparatus according to claim 1 or 2, comprising:
The aforementioned liquid fuel is methanol, The liquid fuel-using equipment according to claim 1 or 2, wherein the purging fluid is clean water.
The floating body and A floating body comprising the liquid fuel-using equipment described in claim 1 or 2.
A method for operating a liquid fuel-using facility according to claim 1 or 2, The process of supplying the liquid fuel in the fuel tank to the combustion device through the fuel supply line and driving the combustion device, The steps include stopping the operation of the combustion device and supplying the purge liquid from the purge liquid supply unit to the liquid fuel flow path, A step of recovering the discharged liquid, which is pushed out by the purge liquid supplied to the liquid fuel flow path, into the recovery tank through the recovery line, The process includes mixing the discharged liquid stored in the recovery tank with the liquid fuel flowing through the fuel supply line and supplying it to the combustion device to drive the combustion device. Operating procedures for equipment using liquid fuels.

Description

This disclosure relates to liquid fuel-using equipment, floating structures, and operating methods for liquid fuel-using equipment. Patent Document 1 discloses a configuration in which flammable gas (fuel) remaining in the piping of an engine driven by flammable gas (fuel) is purged with nitrogen gas or the like and discharged into the atmosphere outside the ship via a vent post. Japanese Patent Publication No. 2013-11332 This is a side view of a floating body equipped with a liquid fuel usage facility according to an embodiment of the present disclosure.This figure shows the configuration of a liquid fuel-using equipment according to an embodiment of this disclosure.This figure shows a recovery tank and a service tank according to an embodiment of the present disclosure.This flowchart shows the procedure for operating a liquid fuel-using facility according to the embodiment of this disclosure.This figure shows the step of driving a combustion device with liquid fuel in the operating method of a liquid fuel-using equipment according to the embodiment of this disclosure.This figure shows the steps of supplying a purge liquid to the liquid fuel flow path and recovering the discharge liquid in a recovery tank, in an operating method for a liquid fuel-using facility according to an embodiment of the present disclosure.This figure shows a step in the operation method of a liquid fuel-using equipment according to an embodiment of the present disclosure, in which the discharge liquid is mixed with liquid fuel to drive the combustion device.This figure shows a state in which the liquid level in the service tank is higher than the liquid level in the recovery tank in a liquid fuel usage facility according to the embodiment of this disclosure.This figure shows a liquid fuel usage system according to an embodiment of the present disclosure, where the liquid level in the service tank is lower than the lower end of the liquid storage space in the recovery tank.This figure shows a recovery tank and a service tank according to a modified embodiment of the present disclosure. <Implementation> Hereinafter, a liquid fuel-using equipment and an operating method for the liquid fuel-using equipment according to the embodiments of this disclosure will be described with reference to Figures 1 to 10. In this embodiment, the case in which the liquid fuel-using equipment is installed on a floating body will be described as an example. (Structure of the floating body) As shown in Figure 1, the floating body 1 comprises at least a floating body body 2 and liquid fuel usage equipment 10. In this embodiment, the floating body 1 is a vessel capable of navigation by a main engine or the like. The type of vessel of the floating body 1 is not limited to a specific type. Examples of vessel types for the floating body 1 include carriers of liquefied gases such as liquefied natural gas (LNG), carbon dioxide, ammonia, and methanol, ferries, RORO ships (Roll-on/Roll-off ships), PCTCs (Pure Car & Truck Carriers), passenger ships, etc. In this embodiment, the case where the floating body 1 is a vessel is described, but the floating body 1 is not limited to a vessel and may be an FSU (Floating Storage Unit), FSRU (Floating Storage and Regasification Unit), etc., which is not capable of navigation by a main engine or the like. (Structure of the floating body) The floating body 2 has a pair of hull sides 3A and 3B that form its outer shell, a bottom 4, and an upper deck 5. The upper deck 5 illustrated in the first embodiment is a full-length deck that is exposed to the outside. A superstructure 7 containing living quarters is formed on the floating body 2. Note that the position of the superstructure 7 is merely an example and is not limited to the arrangement shown in Figure 1. (Configuration of equipment using liquid fuel) Figure 2 shows the configuration of a liquid fuel-using equipment according to an embodiment of the present disclosure. As shown in Figure 2, the liquid fuel equipment 10 in this embodiment is housed within a section of the floating body 2, such as the engine area or fuel preparation area. The liquid fuel equipment 10 mainly comprises a combustion device 11, a storage tank 12, a service tank (fuel tank) 13, a purge liquid supply unit 14, and a recovery tank 15. The combustion device 11 is powered by liquid fuel. In this embodiment, methanol is used as the liquid fuel in the combustion device 11. The combustion device 11 is installed, for example, within the floating body 2. The combustion device 11 is installed, for example, in the engine room (not shown) of the floating body 2. One example of a combustion device 11 is one that generates thermal energy by burning methanol, a liquid fuel. Examples of such combustion devices include internal combustion engines used as the main engine for propelling the floating body 1, and internal combustion engines used in power generation equipment that supplies electricity to the floating body