KR-20260063102-A - EXHAUST GAS TREATMENT SYSTEM FOR SHIP

Abstract

A marine exhaust gas treatment system according to the present invention comprises: an exhaust line through which exhaust gas generated from a main engine is discharged; a methane oxidation catalyst reactor provided on the exhaust line for removing methane contained in the exhaust gas; a burner provided on the exhaust line upstream of the methane oxidation catalyst reactor for heating the exhaust gas to be suitable for a methane oxidation catalyst reaction; an economizer provided on the exhaust line for generating steam by heat exchange with the exhaust gas; a carbon dioxide capture device provided on the exhaust line for removing carbon dioxide contained in the exhaust gas; a steam supply line for supplying steam generated in the economizer to the carbon dioxide capture device; a refrigerant circulation circuit for providing cold energy necessary to liquefy the carbon dioxide captured in the carbon dioxide capture device; and a natural gas supply line connected from a liquefied natural gas storage tank to the burner, for supplying natural gas vaporized through a first heat exchanger on the refrigerant circulation circuit as fuel to the burner.

Inventors

• 유원우

Assignees

• 에이치디한국조선해양 주식회사

Dates

Publication Date

20260507

Application Date

20241030

Claims (6)

1. An exhaust line through which exhaust gas generated from the main engine is discharged; A methane oxidation catalyst reactor provided on the above discharge line for removing methane contained in the exhaust gas; A burner provided on the discharge line upstream of the methane oxidation catalyst reactor to heat the exhaust gas suitable for the methane oxidation catalyst reaction; An economizer provided on the above-mentioned discharge line that generates steam by exchanging heat with the above-mentioned exhaust gas; A carbon dioxide capture device provided on the above-mentioned discharge line for removing carbon dioxide contained in the exhaust gas; A steam supply line that supplies steam generated in the above economizer to the above carbon dioxide capture device; A refrigerant circulation circuit for providing cold energy necessary to liquefy the carbon dioxide captured in the above-mentioned carbon dioxide capture device; and A marine exhaust gas treatment system comprising a natural gas supply line connected from a liquefied natural gas storage tank to a burner, wherein the natural gas vaporized through a first heat exchanger on the refrigerant circulation circuit is supplied as fuel to the burner.
2. In claim 1, The above economizer is provided on the discharge line at the downstream end of the methane oxidation catalyst reactor, and the exhaust gas heated in the methane oxidation catalyst reactor is supplied thereto. The above carbon dioxide capture device is a ship exhaust gas treatment system provided on a carbon dioxide capture line branched from the discharge line at the downstream end of the economizer.
3. In claim 1, A ship exhaust gas treatment system in which carbon dioxide captured by the above-mentioned carbon dioxide capture device is liquefied by passing through a second heat exchanger on the above-mentioned refrigerant circulation circuit.
4. In claim 1, The above natural gas supply line is a marine exhaust gas treatment system connected to at least one of a fuel gas supply system (FGSS), a gas combustion unit (GCU), and a reliquefaction system.
5. In claim 1, A marine exhaust gas treatment system comprising a power generation engine line branched from the above natural gas supply line and supplying the above vaporized natural gas to a power generation engine.
6. In claim 1, A marine exhaust gas treatment system including a BOG supply line for supplying BOG generated in a liquefied natural gas storage tank to the burner.

Description

Exhaust Gas Treatment System for Ships The present invention relates to a marine exhaust gas treatment system, and more specifically, to a marine exhaust gas treatment system capable of increasing energy efficiency by utilizing natural gas used to liquefy captured carbon dioxide as fuel for a burner. Maritime transport accounts for approximately 80% of global trade volume and is the most economical and common means of transport for long-distance cargo. Engines of large cargo ships and cruise ships generally use heavy fuel oil with a high sulfur content. When heavy fuel oil with a high sulfur content is used as fuel as described above, the exhaust gas contains large amounts of carbon dioxide (hereinafter carbon dioxide) and sulfur dioxide (hereinafter SO2). These pollutants are not only harmful to the human body, but if released directly into the atmosphere without filtration, they become a cause of environmental pollution. Accordingly, the UN has delegated the issue of regulating exhaust gas emissions from ships navigating all global waters to the International Maritime Organization (IMO). As the IMO’s regulations on ship exhaust gas have been strengthened from carbon dioxide emissions to GHG emissions, including methane, ships using natural gas as fuel have faced issues regarding not only carbon dioxide emissions but also methane emissions caused by methane slip. For reference, the Global Warming Potential (GWP) of methane is 82.5 times that of carbon dioxide over 20 years and 29.8 times that of carbon dioxide over 100 years. Onboard Carbon Capture Systems (OCCS) designed to reduce carbon dioxide emissions from shipboard exhaust require large amounts of thermal and electrical energy. This process generates additional fuel, leading to reduced energy efficiency, and also results in the generation of additional carbon dioxide during the capture process. While utilizing the cold energy of Liquefied Natural Gas (LNG) in the liquefaction of captured carbon dioxide is a method to increase the efficiency of these systems, research on how to utilize the natural gas (NG) vaporized after the cold energy is utilized has not been actively conducted. Furthermore, the Methane Oxidation Catalytic System (MOCS) for reducing methane in shipboard exhaust gases has an energy efficiency issue in that a burner is installed upstream of the catalytic reactor to create an exhaust gas temperature suitable for the catalytic reaction, and the burner requires additional fuel. FIG. 1 is a drawing illustrating a ship exhaust gas treatment system according to a first embodiment of the present invention. FIG. 2 is a drawing illustrating a ship exhaust gas treatment system according to a second embodiment of the present invention. FIG. 3 is a drawing illustrating a ship exhaust gas treatment system according to a third embodiment of the present invention. Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by these terms. Where it is stated that a component is "connected," "combined," or "joined" to another component, it should be understood that the component may be directly connected or joined to the other component, but that another component may also be "connected," "combined," or "joined" between each component. In this specification, the front-back, left-right, and up-down directions are referred to for convenience of explanation and may be directions orthogonal to one another. <1st Example> FIG. 1 is a drawing illustrating a ship exhaust gas treatment system (100) according to a first embodiment of the present invention. A marine exhaust gas treatment system (100) comprises: an exhaust line (EXL) through which exhaust gas generated from a main engine (10) is discharged; a methane oxidation catalyst reactor (30) provided on the exhaust line (EXL) to remove methane contained in the exhaust gas; a burner (20) provided on the exhaust line (EXL) upstream of the methane oxidation catalyst reactor (30) to heat the exhaust gas to be suitable for a methane oxidation catalyst reaction; an economizer (40) provided on the exhaust line (EXL) to generate steam by exchanging heat with the exhaust gas; a carb