Search

KR-20260062304-A - Ammonia Cracking Apparatus

KR20260062304AKR 20260062304 AKR20260062304 AKR 20260062304AKR-20260062304-A

Abstract

The present invention relates to an ammonia cracking device comprising: a pump for compressing ammonia; a preheating device for preheating the ammonia compressed by the pump; a heater for heating the ammonia preheated by the preheating device; and a cracking unit for decomposing the ammonia that has passed through the heater into nitrogen and hydrogen, wherein the preheating device is driven by heat generated when the ammonia is decomposed into nitrogen and hydrogen in the cracking unit.

Inventors

  • 이창우

Assignees

  • 에이치디한국조선해양 주식회사
  • 에이치디현대중공업 주식회사
  • 에이치디현대삼호 주식회사

Dates

Publication Date
20260507
Application Date
20241029

Claims (8)

  1. A pump that compresses ammonia; A preheating device in which ammonia compressed by the above pump is preheated; A heater in which ammonia preheated by the above preheating device is heated; It includes a cracking unit that decomposes ammonia passing through the heater into nitrogen and hydrogen; and The above-mentioned preheating device is an ammonia cracking device characterized by being driven by heat generated when ammonia is decomposed into nitrogen and hydrogen in the cracking section.
  2. In paragraph 1, The above preheating device includes a heat generator, and An ammonia cracking device characterized in that the above-mentioned thermal generator is driven by heat supplied from the cracking section to generate electricity.
  3. In paragraph 2, The above preheating device includes a compressor that compresses ammonia supplied from the pump, and An ammonia cracking device characterized in that the above compressor is driven by electricity supplied from the above heat generator.
  4. In paragraph 3, An ammonia cracking device characterized by including a vaporizer disposed upstream of the compressor and heating ammonia supplied from the pump with seawater.
  5. In paragraph 3, An ammonia cracking device characterized in that a portion of the heat generated in the cracking section is supplied to the heater.
  6. In paragraph 1, The above preheating device includes a heating section and a cooling section that form a closed loop through which the refrigerant moves, and The heat generated in the cracking section is supplied to the cooling section, and An ammonia cracking device characterized in that the refrigerant heated in the cooling section is moved to the heating section to heat the ammonia discharged from the pump.
  7. In paragraph 6, The above preheating device is an ammonia cracking device characterized by including a generator that generates electricity through the movement of the refrigerant when the refrigerant moves.
  8. In Paragraph 7, The above preheating device includes a drive pump that moves the refrigerant, and An ammonia cracking device characterized in that the above-mentioned drive pump is driven by electricity generated from the above-mentioned generator.

Description

Ammonia Cracking Apparatus The present invention relates to an ammonia cracking device. Recently, a national decision was made to adopt hydrogen co-firing gas power generation and ammonia co-firing coal power generation to reduce carbon dioxide emissions. Consequently, research is underway to vaporize ammonia offshore and supply it as ammonia gas to ammonia and coal co-firing power plants. Additionally, a plan is being discussed to import ammonia as a hydrogen carrier to supply hydrogen for these plants, decompose it, and use the resulting hydrogen gas for power generation. Meanwhile, a large amount of energy is required to generate the high temperature and pressure necessary to decompose liquid ammonia into hydrogen and nitrogen. Specifically, ammonia requires a significant amount of energy to vaporize due to its high latent heat of vaporization. There is a problem in that ammonia condenses at room temperature and high pressure, making it difficult to utilize natural heat sources such as seawater. In other words, since a large amount of energy is consumed when decomposing ammonia to produce hydrogen, research is needed on methods to efficiently implement the process of decomposing ammonia into hydrogen and nitrogen. FIG. 1 is a drawing illustrating an embodiment of the present invention. FIG. 2 is a drawing illustrating another embodiment of the present invention. A preferred embodiment of the present invention capable of specifically realizing the above objectives will be described below with reference to the attached drawings. In this process, the size or shape of components depicted in the drawings may be exaggerated for clarity and convenience of explanation. Additionally, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intent or convention of the user or operator. Definitions of such terms should be based on the content throughout this specification. FIG. 1 is a drawing illustrating an embodiment of the present invention. Referring to FIG. 1, the present invention comprises a pump (10) for compressing ammonia, a preheating device (100) for preheating the ammonia compressed by the pump (10), a heater (20) for heating the ammonia preheated by the preheating device (100), and a cracking unit (30) for decomposing the ammonia that has passed through the heater (20) into nitrogen and hydrogen. Meanwhile, the above preheating device (100) is driven by the heat generated when ammonia is decomposed into nitrogen and hydrogen in the cracking section (30). A heat recovery unit (40) is provided to recover heat generated in the cracking unit (30), so that a portion of the recovered heat can be supplied to various components. The heat recovery unit (40) may include a heat exchanger, etc., to obtain heat while lowering the high temperature of hydrogen and nitrogen discharged from the cracking unit (30). An ammonia supply unit (1), such as an ammonia carrier, is positioned at the front end of the above pump (10). The above ammonia supply unit (1) transports/stores ammonia in a low-pressure, low-temperature state, such as an ammonia carrier. The ammonia supplied from the ammonia supply unit (1) is supplied to the pump (10). At this time, the flow rate of the ammonia can be supplied at, for example, a flow rate of approximately 100 ton/hour. The temperature of the ammonia is minus 33 degrees Celsius, and the pressure can be approximately 0 barg. The pump (10) pressurizes the supplied liquid ammonia to satisfy some of the temperature and pressure required by the cracking unit (30). By the pump (10), the temperature of the ammonia can be raised to approximately minus 32 degrees Celsius and the pressure can be raised to 2 barg. The above preheating device (30) includes a heat generator (110), and the heat generator (110) can generate electricity by being driven by heat supplied from the cracking unit (30). The heat generator (110) receives heat from the heat recovery unit (40) and uses that heat to produce electricity. Additionally, the preheating device (30) includes a compressor (120) that compresses ammonia supplied from the pump (10), and the compressor (120) can be driven by electricity supplied from the heat generator (110). The above preheating device (30) may include a vaporizer (130) that is positioned upstream of the compressor (120) and heats the ammonia supplied from the pump (10) with seawater. As the ammonia pressurized by the pump (10) passes through the vaporizer (130), it absorbs heat from the seawater, so that the temperature of the ammonia can be raised to approximately 5 degrees Celsius, and the pressure can be maintained within the same range. The ammonia passing through the vaporizer (130) is compressed by the compressor (120), and the pressure rises to approximately 44 barg and the temperature can rise to 33 degrees Celsius. At this time, since the compressor (120) is driven by power supplied from the heat generator (1