KR-20260064921-A - Sea Water Electrolysis System and Offshore Structure

KR20260064921AKR 20260064921 AKR20260064921 AKR 20260064921AKR-20260064921-A

Abstract

A seawater electrolysis system is provided, comprising: a seawater battery that decomposes seawater to produce electricity and purified water; and a water electrolysis stack that receives purified water produced from the seawater battery and produces hydrogen, wherein the seawater battery comprises: a positive electrode that decomposes seawater to produce sodium ions, hydrogen, and chlorine and generates electrons; a negative electrode that stores the sodium ions and electrons produced at the positive electrode as sodium; a liquid electrolyte that accommodates the negative electrode; and a separator located between the positive electrode and the negative electrode that partitions the seawater and the liquid electrolyte.

Inventors

박수정

Assignees

에이치디현대중공업 주식회사

Dates

Publication Date: 20260508
Application Date: 20241030

Claims (7)

Seawater battery that decomposes seawater to produce electricity and purified water; and It includes a water electrolysis stack that produces hydrogen by receiving purified water generated from the above seawater battery, and The above seawater battery An anode that decomposes the above seawater to produce sodium ions, hydrogen, and chlorine, and generates electrons; A cathode that stores sodium ions and electrons generated at the anode as sodium; A liquid electrolyte accommodating the above cathode; and A seawater electrolysis system characterized by including a separator located between the anode and cathode and partitioning the seawater and the liquid electrolyte.
In paragraph 1, The above-mentioned water electrolysis stack is A seawater electrolysis system characterized by including a polymer electrolyte membrane (PEM) water electrolysis stack.
In paragraph 1, It includes an electrolyte tank that mixes an alkaline electrolyte with the purified water and supplies it to the water electrolysis stack, and The above-mentioned water electrolysis stack is Alkaline (ALK) water electrolysis stack, or A seawater electrolysis system characterized by including at least one of anion exchange membrane (AME) water electrolysis.
In paragraph 1, The above seawater battery A seawater electrolysis system characterized by decomposing sodium at the anode to produce power required for driving the above-mentioned water electrolysis stack.
In paragraph 1, A seawater electrolysis system characterized in that the positive or negative electrode of the above seawater battery contains carbon.
In paragraph 1, A seawater electrolysis system characterized in that the above-mentioned separation membrane is a solid electrolyte.
A marine structure comprising a seawater electrolysis system according to any one of paragraphs 1 through 6.

Description

Seawater Electrolysis System and Offshore Structure The present invention relates to a seawater electrolysis system capable of supplying an alkaline seawater electrolyte and a marine structure equipped with the same. As renewable energy sources such as solar and wind power gain attention as alternatives to fossil fuels and nuclear power, various technologies are being proposed to address the variability of renewable energy. Additionally, while hydrogen is receiving significant interest as a clean energy source, the current demand is being met through fossil fuel reforming methods, leading to an increasing need for hydrogen production methods that do not rely on fossil fuels. Water electrolysis is a method of producing hydrogen by using electricity to decompose water, and with the advancement of fuel cell technology, hydrogen has garnered attention as a next-generation eco-friendly energy source. Hydrogen plays a crucial role in energy storage and conversion, and can reduce dependence on fossil fuels and lead to an eco-friendly energy transition. For example, it can be utilized to power vehicles using hydrogen fuel cells or stored in power plants to generate electricity. These technologies are gaining attention as a response to climate change and are expected to play a significant role in pioneering new eco-friendly energy pathways. Hydrogen, primarily produced by the electrolysis of water, is regarded as a truly clean energy source. Technology development is underway to support the hydrogen production process by utilizing renewable energy sources such as solar and wind power for clean hydrogen production, and the advancement of these technologies is expected to play the most significant role in reducing the use of fossil fuels and decreasing greenhouse gas emissions. Since the water electrolysis stack consumes water to generate hydrogen, if the water contains ions, the ion concentration increases as electrolysis progresses, which can lead to the formation of salts. If salts precipitate within the stack, it shortens its lifespan; therefore, the ion concentration of the water supplied to the stack must be lowered. FIG. 1 is a drawing illustrating an embodiment of the marine structure of the present invention. FIG. 2 is a diagram illustrating the seawater electrolysis system of the present invention. Figure 3 is a diagram illustrating the reaction of seawater electrons to produce purified water in the seawater electrolysis system of the present invention. Figure 4 is a diagram illustrating the power supply process of the seawater battery of the seawater electrolysis system of the present invention. Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components regardless of drawing symbols will be assigned the same reference number, and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the ease of drafting the specification and do not inherently possess distinct meanings or roles. Furthermore, in describing embodiments disclosed in this specification, if it is determined that a detailed description of related prior art could obscure the essence of the embodiments disclosed in this specification, such detailed description will be omitted. Additionally, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification; the technical concept disclosed in this specification is not limited by the attached drawings, and it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and technical scope of the present invention. Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. A singular expression includes a plural expression unless the context clearly indicates otherwise. In this application, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. FIG. 1 is a drawing