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JP-7856406-B2 - Ammonia fuel supply unit and boiler system

JP7856406B2JP 7856406 B2JP7856406 B2JP 7856406B2JP-7856406-B2

Inventors

  • 竹井 康裕
  • 山内 康弘
  • 住田 忠
  • 鶴丸 慧

Assignees

  • 三菱重工業株式会社

Dates

Publication Date
20260511
Application Date
20211124

Claims (8)

  1. an ammonia fuel supply pipe configured to supply ammonia fuel to a boiler, The system includes an outer tube that is arranged to surround at least a portion of the ammonia fuel supply tube and forms a double-tube structure together with the ammonia fuel supply tube, An intermediate space for the flow of purge gas is formed between the outer pipe and the ammonia fuel supply pipe. The outer tube is located inside the boiler building, or outside the building, but only inside the building. The ammonia fuel supply pipe is installed so as to penetrate the wall portion that constitutes the building, The upstream end of the outer pipe is connected to an ammonia fuel supply unit on the inner surface of the wall portion.
  2. an ammonia fuel supply pipe configured to supply ammonia fuel to a boiler, The system includes an outer tube that is arranged to surround at least a portion of the ammonia fuel supply tube and forms a double-tube structure together with the ammonia fuel supply tube, An intermediate space for the flow of purge gas is formed between the outer pipe and the ammonia fuel supply pipe. The outer tube is connected to a hot air duct configured to guide hot air heated by an air heater to the boiler. The ammonia fuel supply pipe is An inner tube positioned inside the outer tube, An ammonia fuel supply unit including a connecting pipe that is positioned inside the hot air duct and connected to the boiler and the inner tube.
  3. The aforementioned connecting pipe is further equipped with an insulating mechanism provided on its outer surface, The ammonia fuel supply unit according to claim 2, wherein the ammonia fuel supply pipe has a liquid ammonia supply passage formed on its inside.
  4. The system further includes an air supply pipe configured to deliver air from the atmosphere to the outer tube without applying heat treatment, The ammonia fuel supply unit according to claim 2, wherein the ammonia fuel supply pipe has a liquid ammonia supply passage formed on its inside.
  5. The system further comprises an extraction pipe configured to send the hot air extracted from the hot air duct to the outer pipe, The ammonia fuel supply unit according to claim 2, wherein the inner pipe has an ammonia gas supply passage formed on its inside.
  6. The ammonia fuel supply unit according to claim 1 or 2, further comprising an ammonia detector provided in at least one of the intermediate space between the ammonia fuel supply pipe and the outer pipe, a space communicating with the intermediate space, or an outer space in the outer pipe, and configured to detect ammonia fuel.
  7. an ammonia fuel supply pipe configured to supply ammonia fuel to a boiler, The system includes an outer tube that is arranged to surround at least a portion of the ammonia fuel supply tube and forms a double-tube structure together with the ammonia fuel supply tube, Between the outer tube and the ammonia fuel supply tube , an intermediate space is formed for the purge gas to flow toward the boiler. An ammonia fuel supply unit configured such that, if the ammonia fuel leaks from the ammonia fuel supply pipe into the intermediate space, the ammonia fuel flows through the intermediate space together with the purge gas and is guided to the boiler.
  8. an ammonia fuel supply unit according to claim 1 or 2, A boiler system comprising: a boiler that generates steam using combustion gas produced by the combustion of ammonia fuel supplied from the ammonia fuel supply unit as a heat source.

Description

This disclosure relates to an ammonia fuel supply unit and a boiler system. Boilers in which ammonia is supplied as fuel to the furnace are known. For example, in the boiler disclosed in Patent Document 1, ammonia co-firing is performed, in which ammonia is burned together with coal in the furnace. Japanese Patent Publication No. 2020-112280 This is a schematic diagram of a boiler system according to one embodiment.This is a schematic diagram of the ammonia fuel supply unit according to the first embodiment.This is a schematic diagram of the ammonia fuel supply unit according to the second embodiment.This is a schematic diagram of the ammonia fuel supply unit according to the third embodiment.This is a schematic diagram of the ammonia fuel supply unit according to the fourth embodiment.Figures 2A to 2D show a conceptual enlarged view of the region enclosed by the dashed line A.Figures 2A and 2C show a conceptual enlarged view of the region enclosed by the dashed line B. An embodiment of the present invention will be described below with reference to the drawings. Note that the present invention is not limited by this embodiment, and if there are multiple embodiments, they may be constructed by combining each embodiment. In the following description, "up" or "above" refers to the upper side in the vertical direction, and "down" or "below" refers to the lower side in the vertical direction; the vertical direction is not precise and includes errors. Furthermore, the dimensions, materials, shapes, and relative arrangements of the components described or shown in the drawings as embodiments are not intended to limit the scope of this disclosure, but are merely illustrative examples. For example, expressions describing relative or absolute arrangements such as "in a certain direction,""along a certain direction,""parallel,""orthogonal,""center,""concentric," or "coaxial" should not only strictly describe such arrangements, but also describe states of relative displacement with tolerances or angles or distances that allow for the same function to be achieved. For example, expressions such as "identical,""equal," and "homogeneous" that describe things being in an equal state not only describe a state of being strictly equal, but also describe a state in which there is a tolerance or a difference that is sufficient to achieve the same function. For example, expressions describing shapes such as squares or cylinders shall not only represent geometrically precise shapes such as squares or cylinders, but also shapes that include protrusions, chamfers, etc., to the extent that the same effect can be achieved. On the other hand, expressions such as "possessing,""including," or "having" one component are not exclusive expressions that exclude the existence of other components. Note that similar configurations may be denoted by the same reference numerals and their explanations may be omitted. <1. Overall configuration of boiler system 1> Figure 1 is a schematic diagram showing a boiler system 1 that includes a boiler that primarily uses ammonia fuel and other fuels besides ammonia fuel, according to this embodiment. The boiler 10 in the boiler system 1 of this embodiment is a boiler capable of generating superheated steam by burning other fuels and ammonia fuel in a burner, and exchanging the heat generated by this combustion with feedwater or steam. As the other fuels, solid fuels such as biomass fuel and coal are used. The solid fuel coal is, for example, pulverized coal fuel. The ammonia fuel is either liquid ammonia or ammonia gas. The boiler 10 comprises a furnace 11, combustion devices 20 and 50, and a combustion gas passage 12. The furnace 11 has a hollow, rectangular shape and is installed vertically. The furnace wall 101, which constitutes the inner wall surface of the furnace 11, is composed of multiple heat transfer tubes and fins connecting the heat transfer tubes. It recovers the heat generated by the combustion of pulverized coal fuel by heat exchange with water or steam circulating inside the heat transfer tubes, while also suppressing the temperature rise of the furnace wall 101. The combustion devices 20 and 50 are installed in the lower region of the furnace 11. In this embodiment, the combustion device 20 is configured to inject pulverized coal fuel into the furnace 11. The combustion device 50 is configured to inject ammonia fuel into the furnace 11. The combustion device 20 has a plurality of burners 21 mounted on the furnace wall 101, and the combustion device 50 has a plurality of ammonia burners 51. Each burner 21 is provided with an injection nozzle (not shown) configured to inject pulverized coal fuel into the furnace 11 at its tip. Each ammonia burner 51 is also provided with an ammonia injection nozzle (not shown) at its tip. When a liquid ammonia injection method is adopted in which liquid ammonia is injected into the furnace 11, the ammonia injection nozzle may be a two-fluid injection nozzle