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KR-20260064127-A - SYSTEM FOR REDUCING AMMONIA LEAKAGE IN A DUAL FUEL SUPPLY SYSTEM FOR SHIP

KR20260064127AKR 20260064127 AKR20260064127 AKR 20260064127AKR-20260064127-A

Abstract

The present invention discloses an ammonia leakage reduction system for a dual fuel supply system for ships. For example, an ammonia leakage reduction system for a dual fuel supply system for a ship according to an embodiment is disclosed, comprising: a first shutdown valve installed at the front end of a fuel supply line; a second shutdown valve installed at the rear end of a fuel supply line; a blowdown valve connected between the first shutdown valve and the second shutdown valve; and a control unit that controls the opening and closing of the first shutdown valve, the second shutdown valve, and the blowdown valve, respectively, to recover or discharge ammonia fuel in the piping of the fuel supply line when an emergency situation is detected.

Inventors

  • 김현표
  • 김별
  • 김성희
  • 박상민

Assignees

  • 에이치디한국조선해양 주식회사

Dates

Publication Date
20260507
Application Date
20241031

Claims (7)

  1. A first shutdown valve installed at the front end of the fuel supply line; A second shutdown valve installed at the downstream end of the fuel supply line; A blowdown valve connected between the first shutdown valve and the second shutdown valve; and A control unit that controls the opening and closing of the first shutdown valve, the second shutdown valve, and the blow-down valve, respectively, upon detection of an emergency situation to recover or discharge ammonia fuel within the piping of the fuel supply line; Ammonia leakage reduction system for a dual fuel supply system for ships, characterized by including
  2. In Article 1, An ammonia leakage reduction system for a dual fuel supply system for a ship, characterized by further including a pressure safety valve connected between the downstream end of the fuel supply line and the second shutdown valve.
  3. In Article 1, The above control unit is, An ammonia leakage reduction system for a dual fuel supply system for a ship, characterized by controlling the first shutdown valve and the second shutdown valve to be closed and the blow-down valve to be opened when an emergency situation is detected.
  4. In Article 1, The above blowdown valve is, Ammonia leakage reduction system for a dual fuel supply system for ships, characterized by being connected to a fuel tank and allowing ammonia fuel flowing in when opened to be recovered into the fuel tank.
  5. In Paragraph 4, The above ammonia leakage reduction system is, A first pressure sensor that measures the pressure at the downstream end of the fuel supply line and transmits the measured first pressure value to the control unit; and It further includes a second pressure sensor that measures the pressure of the fuel tank and transmits the measured second pressure value to the control unit, The above control unit is, An ammonia leakage reduction system for a dual fuel supply system for a ship, characterized by controlling the blow-down valve to close when the first pressure value and the second pressure value become identical within a preset error range.
  6. In Article 1, The above blowdown valve is, It is connected to the fuel recovery system through the catch tank, and Ammonia leakage reduction system for a dual fuel supply system for a ship, characterized by recovering liquid ammonia into a fuel tank through a fuel recovery system and discharging ammonia gas through the vent mast.
  7. In Article 1, The above blowdown valve is connected to a drip tray, and The above drip tray is connected to the drain tank through the drain line, and The above blowdown valve is, Ammonia leakage reduction system for a dual fuel supply system for a ship, characterized by allowing liquid ammonia to be discharged to the drain tank along the drip tray and the drain line through the opened blowdown valve.

Description

Ammonia Leakage Reduction System for a Dual Fuel Supply System for Ships The present invention relates to an ammonia leakage reduction system for a dual fuel supply system for ships. As global warming intensifies, efforts are being made worldwide to reduce greenhouse gas emissions. With the 1997 Kyoto Protocol, which included greenhouse gas reduction obligations for developed countries, set to expire in 2020, the 195 parties participating in the Paris Climate Change Accord—which was adopted at the 21st United Nations Framework Convention on Climate Change held in Paris, France in December 2015 and entered into force in November 2016—are making various efforts to reduce greenhouse gas emissions. Along with these global trends, interest in renewable energy (or renewable energy) such as wind, solar photovoltaic, solar thermal, bioenergy, tidal, and geothermal power is increasing as pollution-free energy that can replace fossil fuels and nuclear power, and various technological developments are underway. Meanwhile, various studies are also being conducted on eco-friendly ship fuels capable of reducing carbon dioxide emissions, and furthermore, on ship fuels for complete decarbonization. In particular, technologies for using ammonia, hydrogen, and other substances as ship fuels are being actively researched and developed. Generally, ammonia ( NH₃ ) is a substance in which three hydrogen atoms are bonded to one nitrogen atom. It can form strong hydrogen bonds between molecules, making it easy to liquefy. At atmospheric pressure, it has a boiling point of -33.34°C and a melting point of -77.73°C. This ammonia is easier to store than conventional LNG, and although it is slightly lower in specific energy and energy density compared to conventional HFO, it emits no carbon dioxide, making it a promising eco-friendly ship fuel capable of responding to the trend of tightening international greenhouse gas emission standards. For alternative fuels used as dual fuel in conventional ships, safety systems are designed primarily by focusing on flammability (LFL: Lower Flammability Limit). However, compared to flammability (LFL 160,000 ppm), ammonia has very low toxicity limit concentrations (e.g., 25, 110, 220, 300 ppm), and especially if a leak occurs indoors, it reaches the toxicity limit concentration within seconds, and even if the ventilation system is operated, it takes at least several hours to return to the normal range. Therefore, to reduce the toxic effects of ammonia leakage, it is necessary to develop a system that can reduce the leakage amount over time. FIG. 1 is a diagram showing the overall configuration of an ammonia leakage reduction system for a dual fuel supply system for ships according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a method for recovering liquid ammonia in a pipe through a blowdown valve and a fuel tank in the event of an ammonia leak according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a method for discharging liquid ammonia through a blowdown valve, drip tray, and drain tank in the event of an ammonia leak according to an embodiment of the present invention. FIG. 4 is a diagram illustrating the configuration and process of ammonia purging according to an embodiment of the present invention. Hereinafter, with reference to the attached drawings, an ammonia leakage reduction system for a dual fuel supply system for a ship according to an embodiment of the present invention will be examined in detail. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all technical concepts of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application. Fig. 1 is a drawing showing the overall configuration of an ammonia leakage reduction system for a dual fuel supply system for a ship according to an embodiment of the present invention, Fig. 2 is a drawing showing a method for recovering liquid ammonia in a piping through a blowdown valve and a fuel tank in the event of an ammonia leak according to an embodiment of the present invention, and Fig. 3 is a drawing showing a method for discharging liquid ammonia through a blowdown valve, a drip tray, and a drain tank in the event of an ammonia leak according to an embodiment of the present invention. Referring to FIG. 1, an ammonia leakage reduction system (1000) according