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KR-102963298-B1 - Circulation System and Method of Double Wall Pipe for Supplying Fuel to Engine

KR102963298B1KR 102963298 B1KR102963298 B1KR 102963298B1KR-102963298-B1

Abstract

A double-pipe circulation system for engine fuel supply is initiated. A double-pipe circulation system for engine fuel supply includes a double pipe through which coolant discharged after cooling the engine jacket is supplied between an inner pipe and an outer pipe, and fuel is supplied to the engine along the inner pipe of the double pipe.

Inventors

  • 김종현

Assignees

  • 한화오션 주식회사

Dates

Publication Date
20260511
Application Date
20210820

Claims (14)

  1. A double pipe through which coolant discharged after cooling the engine jacket is supplied between the inner and outer pipes; A jacket cooling system for cooling the cooling water passing between the inner tube and the outer tube of the above double tube; and Includes the above engine and an expansion tank installed on the upper part of the double pipe; Fuel is supplied to the engine along the inner tube of the double tube, and The coolant cooled by the above jacket cooling system is sent to the engine jacket, and Part or all of the cooling water cooled by the jacket cooling system is sent to the expansion tank, and A double-pipe circulation system for engine fuel supply, wherein fuel leaked from the double pipe or the engine jacket is collected in the expansion tank.
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  3. In claim 1, The above jacket cooling system is, A cooler that cools the cooling water; A three-way valve installed upstream of the above cooler; and A pump that applies pressure to the coolant discharged from the above cooler and supplies the coolant to the above engine jacket; A dual-pipe circulation system for engine fuel supply, including
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  5. In claim 1, A double-pipe circulation system for engine fuel supply, further comprising a gas separator that separates the leaked fuel mixed in the coolant and sends the leaked fuel to the expansion tank.
  6. In claim 1, A double-pipe circulation system for engine fuel supply, further comprising a detector installed in the expansion tank to detect the leaked fuel.
  7. In any one of claims 1, 3, 5 and 6, The above engine is a DF engine, and A double-pipe circulation system for supplying engine fuel, wherein the fuel supplied to the engine along the inner pipe of the double-pipe is vaporized LNG, vaporized VOC, or a mixture of vaporized LNG and vaporized VOC.
  8. In claim 7, The above VOC is a double-pipe circulation system for engine fuel supply supplied from a cargo tank storing fuel oil.
  9. In any one of claims 1, 3, 5 and 6, A double-pipe circulation system for engine fuel supply, wherein the temperature of the fuel supplied to the engine along the inner pipe of the double pipe is maintained at 40 degrees or higher.
  10. After cooling the engine jacket, the discharged coolant is supplied between the inner and outer tubes of the double pipe, Maintaining the temperature of the fuel supplied to the engine along the inner tube of the above double tube at a certain temperature or higher, The coolant passing between the inner and outer tubes of the above double tube is cooled by the jacket cooling system and then sent to the engine jacket, and Part or all of the cooling water cooled by the above jacket cooling system is sent to an expansion tank, and A double-pipe circulation method for engine fuel supply, wherein fuel leaked from the double pipe or the engine jacket is collected in the expansion tank.
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  13. In claim 10, A double-pipe circulation method for engine fuel supply, wherein the leaked fuel mixed with the coolant is separated by a gas separator and sent to the expansion tank.
  14. In claim 10, A double-pipe circulation method for engine fuel supply, which detects the leaked fuel collected in the expansion tank using a detector.

Description

Circulation System and Method of Double Wall Pipe for Supplying Fuel to Engine The present invention relates to a system and method for supplying fuel to an engine, and in particular, to a system and method for preventing condensation from occurring in the fuel supplied to the engine. Gaseous LNG (Liquefied Natural Gas, gaseous LNG means a state in which LNG has been vaporized. The same applies hereinafter) and gaseous VOC (Volatile Organic Compounds) can be used as fuel for Dual Fuel Engines (DF engines). LNG is a colorless, transparent liquid obtained by liquefying natural gas, which is composed mainly of methane, by cooling it to about -163°C. It has a volume that is about 1/600th that of natural gas. Therefore, liquefying natural gas allows for very efficient transportation. VOC stands for Volatile Organic Compounds, and it is a collective term for Vapor-phase Atmospheric Organics, which exist as gases in the general atmospheric environment due to their high vapor pressure, excluding carbon monoxide (CO) and carbon dioxide ( CO2 ). The DF engine, also known as DFDE (Dual Fuel Diesel Electric) or DFDG (Dual Fuel Diesel Generator), consists of four strokes and adopts the Otto cycle, in which fuel with a relatively low pressure of about 6.5 bar is injected into the combustion air inlet and compressed as the piston rises. Since DF engines use fuel in a gaseous state, the fuel supplied to the DF engine must not condense, and if condensation occurs in the fuel due to a drop in temperature caused by the influence of the outside air, it will have an adverse effect on the engine. FIG. 1 is a schematic diagram of a double-pipe circulation system for engine fuel supply according to a preferred embodiment of the present invention. FIG. 2 is a schematic diagram of a fuel mixing system applied to a preferred embodiment of the present invention. The structure and operation of a preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. The following embodiments may be modified in various different forms, and the scope of the present invention is not limited to the following embodiments. FIG. 1 is a schematic diagram of a double-pipe circulation system for engine fuel supply according to a preferred embodiment of the present invention. Referring to FIG. 1, the double-pipe circulation system for engine fuel supply of the present embodiment includes a double pipe (100) that supplies fuel to the engine (E) (FL) and has coolant flowing between the inner pipe and the outer pipe (CL1). The coolant used to cool the engine (E) jacket can exceed 90 degrees, and the high-temperature coolant discharged after cooling the engine (E) jacket is supplied to the double pipe (100) (CL2) to maintain the temperature of the fuel flowing through the inner pipe of the double pipe (100) above a certain temperature. Since the high-temperature coolant flows between the inner pipe and the outer pipe of the double pipe (100), the generation of condensation of the fuel flowing through the inner pipe of the double pipe (100) is suppressed. In the case where the engine (E) is a DF engine, it is desirable that the temperature of the fuel supplied to the engine (E) through the double pipe (100) be approximately 40 degrees or higher. After cooling the engine (E) jacket, the coolant (CL1) that is discharged (CL2) and passes between the inner and outer tubes of the double tube (100) is sent to the jacket cooling system (200) (CL3). The coolant sent to the jacket cooling system (200) has its temperature lowered sufficiently by the jacket cooling system (200) to cool the engine (E) jacket, and the coolant with the lowered temperature is sent to the engine (E) jacket (CL4). The coolant (CL4) sent to the engine (E) jacket cools the engine (E) jacket and then, with its temperature raised, is supplied (CL2) again between the inner and outer tubes of the double tube (100) and circulated. The jacket cooling system (200) may include a cooler (210) that cools the coolant, and may further include a pump (220) that applies pressure to the coolant discharged from the cooler (210) to supply the coolant to the engine (E) jacket. Additionally, the jacket cooling system (200) of the present embodiment may further include a three-way valve (230) installed upstream of the cooler (210). Since low-temperature corrosion may occur if coolant at too low a temperature flows into the engine (E) jacket, the temperature of the coolant can be controlled by diverting a portion of the coolant from the cooler (210) by the three-way valve (230) and then joining it with the coolant that has passed through the cooler (210). According to the present invention, by utilizing the coolant used to cool the engine (E) jacket, the temperature of the fuel supplied to the engine (E) can be maintained simply and efficiently at a temperature above a certain level without the need for a separate heating system. Meanwhile, the double-pipe ci