KR-20260062541-A - Ammonia trap for removing ammonia in hydrogen or nitrogen extracted by electrolysis

KR20260062541AKR 20260062541 AKR20260062541 AKR 20260062541AKR-20260062541-A

Abstract

The present invention relates to an ammonia trap for removing ammonia from hydrogen or nitrogen extracted by the electrolysis of liquefied ammonia. The above ammonia trap comprises: a trap body having an internal receiving space; a plurality of inlet pipes extending spaced apart to the bottom of the trap body, into which hydrogen or nitrogen, unreacted gas, and liquid ammonia are introduced; a water storage unit for supplying water to the trap body to dissolve the gas and liquid ammonia; a pH sensor for detecting the pH concentration of the fluid within the trap body; a drain pipe connected to the lower part of the trap body for discharging the water in which the gas and liquid ammonia are dissolved; a control unit for controlling a valve installed in the drain pipe according to the detection value of the pH sensor; and a bubble separator plate located within the trap body and having a plurality of spaced-apart openings. The control unit controls the discharge of water in which gaseous and liquid ammonia are dissolved within the trap body according to the detection value of the pH sensor, and the inlet pipe extends to the lower part of the bubble separator plate, and the gaseous and liquid ammonia introduced into the trap body are broken down into small pieces as they pass through a plurality of openings of the bubble separator plate, and the contact area with water is increased so that the gaseous and liquid ammonia can be dissolved well. According to this configuration, a plurality of openings are formed spaced apart in the bubble separator, and by allowing ammonia to pass through these openings, unreacted gas and liquid ammonia contained in hydrogen or nitrogen extracted by the electrolysis of liquid ammonia can be efficiently removed.

Inventors

장은갑
심태희
전세신
정은미

Assignees

주식회사 에이이에스텍

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (4)

In an ammonia trap for removing unreacted gas and liquid ammonia contained in hydrogen or nitrogen extracted by the electrolysis of ammonia, A trap body having an internal receiving space; A plurality of inlet pipes extending spaced apart to the bottom of the trap body, into which hydrogen or nitrogen, unreacted gas, and liquid ammonia are introduced; A water storage unit for supplying water to the trap body to dissolve gaseous and liquid ammonia; A pH sensor for detecting the pH concentration of the fluid within the above trap body; A drain pipe connected to the lower part of the above trap body for discharging water in which gas and liquid ammonia are dissolved; A control unit for controlling a valve installed in the drain pipe according to the detection value of the pH sensor; Includes, The above control unit controls the discharge of water in which gaseous and liquid ammonia are dissolved within the trap body according to the detection value of the pH sensor, an ammonia trap.
In paragraph 1, A bubble separator plate located within the above-mentioned trap body and having a plurality of spaced-apart openings; Includes more, The above inlet pipe extends to the lower part of the bubble separator plate, and An ammonia trap in which gaseous and liquid ammonia flowing into the trap body are broken down into small pieces as they pass through a plurality of openings of the bubble separator plate, and the contact area with water is increased so that gaseous and liquid ammonia can be dissolved well.
In paragraph 2, A moisture remover connected to the upper part of the trap body, which removes moisture contained in hydrogen or nitrogen discharged from the trap body; A moisture supply channel connected between the moisture remover and the trap body to supply moisture removed by the moisture remover to the trap body; Ammonia trap containing more
In paragraph 1, A water level sensor for detecting the water level inside the trap body; Includes more, The above control unit is an ammonia trap that determines whether to supply water to the trap body according to the detection value of the water level sensor.

Description

Ammonia trap for removing ammonia in hydrogen or nitrogen extracted by electrolysis The present invention relates to an ammonia trap for removing ammonia from hydrogen or nitrogen extracted by the electrolysis of liquefied ammonia. The method of producing hydrogen ( H₂ ) from ammonia ( NH₃ ) is mainly carried out through the decomposition reaction of ammonia. Since ammonia does not contain carbon, it has the advantage of not generating carbon dioxide ( CO₂ ) during hydrogen production, and is therefore attracting attention as an eco-friendly hydrogen production technology. Methods for obtaining hydrogen by decomposing ammonia include thermal decomposition, catalytic decomposition, electrochemical decomposition, and plasma decomposition. Among these, pyrolysis is costly but has the advantage of being suitable for mass production, while catalytic decomposition has the advantages of good energy efficiency and a fast reaction rate. Electrochemical decomposition has the advantage of being able to produce hydrogen in an eco-friendly way by using only electricity at low temperatures, and in particular, electrolysis using anhydrous liquid ammonia has the advantage of not generating nitrogen oxides ( NOx ). Plasma decomposition can proceed at low temperatures and react very rapidly, but it has not yet reached commercialization. The electrochemical decomposition of ammonia is a method of producing hydrogen by electrically decomposing ammonia within an electrolyte, in which nitrogen is generated at the anode and hydrogen is generated at the cathode. Since the nitrogen emitted from the anode and the hydrogen emitted from the cathode contain unreacted gases and liquid ammonia, a process to remove ammonia must be undergone to obtain pure hydrogen or nitrogen. Ammonia is removed by dissolving it in water, and an ammonia removal device is required to perform this ammonia removal process efficiently. FIG. 1 is a drawing illustrating the overall configuration of an ammonia trap according to an embodiment of the present invention. FIG. 2 is a drawing illustrating the trap body of the present invention. FIG. 3 is a drawing showing the state in which the bubble separation plate of the present invention is installed inside the trap body. FIG. 4 is a drawing illustrating the bubble separator of the present invention in detail. FIG. 5 is a drawing illustrating a state in which a bubble separation plate and a partition plate are installed within a trap body according to another 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. It should be noted that in assigning reference numerals to the components of each drawing, identical components are denoted by the same numeral whenever possible, even if they are shown in different drawings. FIG. 1 is a drawing illustrating the overall configuration of an ammonia trap according to an embodiment of the present invention. FIG. 2 is a drawing illustrating the trap body of the present invention. FIG. 3 is a drawing illustrating the state in which the bubble separator plate of the present invention is installed within the trap body. FIG. 4 is a drawing illustrating the bubble separator plate of the present invention in detail. FIG. 5 is a drawing illustrating the state in which a bubble separator plate and a partition plate are installed within the trap body according to another embodiment of the present invention. The present invention relates to an ammonia trap for removing ammonia so that unreacted gas and liquid ammonia contained in hydrogen or nitrogen extracted by the electrolysis of ammonia are not discharged to the outside. Referring to FIGS. 1 to 4, the ammonia trap (100) of the present invention includes a trap body (110), an inlet pipe (120), a water storage unit (125), a bubble separator (130), a partition plate (135), a pH sensor (104), a drain pipe (103), a moisture remover (150), a water level sensor (105), a control unit, etc. The trap body (110) has an internal receiving space to provide a space for dissolving unreacted gas and liquid ammonia contained in hydrogen or nitrogen extracted by the electrolysis of ammonia. A lower cover (112) may be attached to the lower part of the trap body (110), and an upper cover (111) may be attached to the upper part. When anhydrous liquid ammonia is electrolyzed in an electrolytic cell, nitrogen is generated as ammonia is oxidized at the anode, and hydrogen is generated as hydrogen ions are reduced at the cathode. The reaction equations occurring at the anode and cathode are as follows. 6NH₂⁻ → N₂ ( g ) + 4NH⁃ (l) + 6e⁻ (anode) 6NH₃ (l) + 6e⁻ → 3H₂ (g) + 6NH₂⁻ ( cathode ) 2NH₃ (l) → N₂ (g) + 3H₂ (g) (overall reaction) Since the nitrogen discharged from the anode contains unreacted gas and liquid ammonia, it is sent to an ammonia trap (100) located downstream of the electrolytic cell to separate the unreact