EP-4353964-B1 - AMMONIA FUEL FEEDING FACILITY AND AMMONIA FUEL FEEDING METHOD

EP4353964B1EP 4353964 B1EP4353964 B1EP 4353964B1EP-4353964-B1

Inventors

YAMADA, DAISUKE
UNSEKI, TAKASHI
TSUMURA, KENJI
UEDA, SHIN
TSUKAMOTO, HIROFUMI

Dates

Publication Date: 20260506
Application Date: 20220418

Claims (4)

An ammonia fuel feeding facility (1) comprising: a floating structure (2) which floats on water; an ammonia tank (3) which is provided in the floating structure (2) and in which liquid ammonia is stored; an ammonia line (4) which leads the liquid ammonia in the ammonia tank (3) to an exterior of the floating structure (2); a water line (5, 305) which leads surrounding water on which the floating structure (2) floats into the floating structure (2); a heating unit (6) which is provided at the floating structure (2) and heats the liquid ammonia by performing heat exchange between the liquid ammonia flowing through the ammonia line (4) and the water flowing through the water line (5, 305), characterised by a liquid ammonia state detection unit (31,431) that is configured to detect at least a temperature of the liquid ammonia heated by the heating unit (6); a flow rate adjusting unit (315) that is configured to adjust the flow rate of the water flowing through the water line (5, 305); a water flow rate control unit (72, 472) that is configured to adjust a flow rate of the water by the flow rate adjusting unit (315) such that a temperature of the liquid ammonia heated by the heating unit (6) falls within a predetermined first_temperature range, based on a detection result of the liquid ammonia state detection unit (31,431); and a water state detection unit (32) that is configured to detect at least a temperature of the water whose temperature has been lowered by heat exchange with the liquid ammonia in the heating unit (6), wherein the water flow rate control unit (72, 472) is configured to adjust the flow rate of the water by the flow rate adjusting unit (315) such that the temperature of the water whose temperature has been lowered by heat exchange with the liquid ammonia in the heating unit (6) falls within a predetermined second temperature range, based on a detection result of the water state detection unit (32).
The ammonia fuel feeding facility (1) according to Claim 1, further comprising: heat generation equipment (21) that is provided in the floating structure (2) and generates heat; and a reheating unit (22) that reheats the water whose temperature has been lowered by heat exchange with the liquid ammonia in the heating unit, by heat emitted from the heat generation equipment (21).
The ammonia fuel feeding facility (1) according to Claim 1 or 2, further comprising: a pressure raising pump (11) that raises pressure of the liquid ammonia.
An ammonia fuel feeding method comprising: heating liquid ammonia stored in an ammonia tank (3) provided in a floating structure (2) which floats on water through heat exchange with surrounding water on which the floating structure floats, and then supplying the liquid ammonia to an exterior of the floating structure (2), characterised by adjusting a flow rate of the water that is heat-exchanged with the liquid ammonia such that a temperature of the liquid ammonia heated by heat exchange falls within a predetermined first temperature range; and adjusting the flow rate of the water that is heat-exchanged with the liquid ammonia such that a temperature of the water heat-exchanged with the liquid ammonia falls within a predetermined second temperature range.

Description

Technical Field The present disclosure relates to an ammonia fuel feeding facility and an ammonia fuel feeding method. The present application claims the right of priority based on Japanese Patent Application No. 2021-119931 filed with the Japan Patent Office on July 20, 2021. Background Art In PTL 1, there is described a marine fuel gas supply system that vaporizes liquefied natural gas and supplies it to an engine. The liquefied natural gas is reduced in volume in a liquid state in order to improve efficiency during transportation or storage. Such liquefied natural gas is sometimes supplied to an engine or the like after being vaporized, and in PTL 1, exhaust heat from an engine is effectively used by heat exchange between cooling water of the engine and the liquefied natural gas when the liquefied natural gas is vaporized. On the other hand, international momentum relating to decarbonized fuel is being increasing, and the introduction of an ammonia co-firing boiler to a coal-fired power plant is being considered. In a case where ammonia is used as fuel, a new facility such as a tank for storing ammonia is required. However, in existing power plants, there is a case where a space to install an ammonia tank cannot be secured. Therefore, in a power plant or the like facing the sea or a lake, storage of ammonia fuel in a floating structure that floats on the sea, the lake, or the like is being considered. In PTL 3, there is described a floating platform equipped with an ammonia storage tank and an ammonia supply system that processes and supplies ammonia to various onshore consumers according to their specific requirements. The platform can extract hydrogen from ammonia, convert ammonia to ambient-temperature liquid ammonia, or use ammonia to generate electricity, supplying each product to different onshore facilities as needed. The system enables flexible, safe, and efficient offshore handling and distribution of ammonia and its derivatives, reducing the need for large onshore installations and associated risks. Citation List Patent Literature [PTL 1] PCT Japanese Translation Patent Publication No. 2019-531966[PTL 2] KR 2010 0133057 A[PTL 3] KR 2020 0049933 A Summary of Invention Technical Problem In a case where the liquefied natural gas is used as fuel as in PTL 1, the stored liquefied natural gas can be re-gasified and then fed to a combustion device in a facility such as a power plant. However, if it is attempted to vaporize the liquid ammonia and then feed it to the combustion device, depending on the feeding pressure or an ambient temperature, there is a possibility that the ammonia gas may be re-liquefied during the feeding. Therefore, it is preferable that the stored ammonia is fed to the combustion device in a liquid state or vaporized just before the combustion device. However, since the stored liquid ammonia has a low temperature such as about -33°C, for example, if the liquid ammonia is burned in the combustion device as it is, an energy loss in the combustion device increases. Further, in a case where vaporization is performed just before the combustion device, external heat is required for the vaporization. The present disclosure has been made to the above problems and has an object to provide an ammonia fuel feeding facility and an ammonia fuel feeding method, in which it is possible to improve the energy efficiency of an onshore plant using ammonia as fuel. Solution to Problem In order to solve the above problems, the following configuration is adopted. An ammonia fuel feeding facility according to the present invention there is provided an ammonia fuel feeding facility comprising: a floating structure which floats on water; an ammonia tank which is provided in the floating structure and in which liquid ammonia is stored; an ammonia line which leads the liquid ammonia in the ammonia tank to an exterior of the floating structure; a water line which leads surrounding water on which the floating structure floats into the floating structure;a heating unit which is provided at the floating structure and heats the liquid ammonia by performing heat exchange between the liquid ammonia flowing through the ammonia line and the water flowing through the water line; a liquid ammonia state detection unit that is configured to detect at least a temperature of the liquid ammonia heated by the heating unit; a flow rate adjusting unit that is configured to adjust the flow rate of the water flowing through the water line; a water flow rate control unit that is configured to adjust a flow rate of the water by the flow rate adjusting unit such that a temperature of the liquid ammonia heated by the heating unit falls within a predetermined first_temperature range, based on a detection result of the liquid ammonia state detection unit; anda water state detection unit that is configured to detect at least a temperature of the water whose temperature has been lowered by heat exchange with the liquid ammonia in the