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CN-121990104-A - Method for recycling cold energy of isolation air cabin of LNG ship

CN121990104ACN 121990104 ACN121990104 ACN 121990104ACN-121990104-A

Abstract

The invention provides a method for recycling cold energy of an isolation empty cabin of an LNG ship, which is realized based on the following structure, wherein the structure comprises a first isolation empty cabin, a second isolation empty cabin, a mechanical room and a carbon capture cabin, ethylene glycol coils are arranged in the upper area of the first isolation empty cabin and the upper area of the second isolation empty cabin, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, an ethylene glycol pump and a second heat exchanger are arranged in the mechanical room, and an analytical tower and a first heat exchanger are arranged in the carbon capture cabin.

Inventors

  • XUE CHANGQI
  • BAI HAIQUAN
  • SHI ZHENG
  • Zhu Fangze
  • Zhao Ziao

Assignees

  • 沪东中华造船(集团)有限公司

Dates

Publication Date
20260508
Application Date
20260130

Claims (9)

  1. 1. The LNG ship isolation empty cabin cold energy recycling method is characterized by being based on a structure comprising a first isolation empty cabin (1), a second isolation empty cabin (2), a mechanical room (3) and a carbon capture cabin (4), wherein an ethylene glycol coil pipe (7) is arranged in the upper area of the first isolation empty cabin (1) and the upper area of the second isolation empty cabin (2), a first stop valve (8), a second stop valve (9), a third stop valve (10), a fourth stop valve (11), an ethylene glycol pump (12) and a second heat exchanger (13) are arranged in the mechanical room (3), an analysis tower (5) and a first heat exchanger (6) are arranged in the carbon capture cabin (4), and the method is characterized in that an ethylene glycol solution is circulated among all components through the arrangement of an ethylene glycol circulation pipeline, so that cold energy recycling is achieved.
  2. 2. Method for cold energy recycling of LNG ship-isolated air tanks according to claim 1, characterized in that the first isolated air tank (1) is located between the tank and the LNG cargo tank and the second isolated air tank (2) is located between the two LNG cargo tanks.
  3. 3. Method for cold energy recycling of an LNG ship's insulation pod according to claim 1, characterized in that the glycol coil (7) of the upper area of the first insulation pod (1) and the glycol coil (7) of the upper area of the second insulation pod (2) are connected in parallel.
  4. 4. Method for cold energy recycling of an LNG ship's insulation pod according to claim 1, characterized in that the machine room (3) is arranged on the starboard side of the LNG ship.
  5. 5. The method for recycling cold energy of the LNG ship isolation air tanks according to claim 1, wherein the structure further comprises a superstructure (14) and a cabin shed (15), and the installation place of the glycol circulation pipeline is a first isolation air tank (1), a machine room (3), a starboard of the superstructure (14), a starboard of the cabin shed (15), a carbon capture cabin (4), a starboard of the cabin shed (15), a starboard of the superstructure (14), the machine room (3) and the first isolation air tank (1) in sequence.
  6. 6. The method for recycling cold energy of an isolated air cabin of an LNG ship according to claim 5, wherein an electric heating belt and an insulating layer are bound on a pipeline on the starboard side of the superstructure (14) and a pipeline on the starboard side of the cabin shed (15).
  7. 7. The method for recycling cold energy of an LNG ship insulation space according to claim 5, wherein the installation of the glycol circulation pipeline is characterized in that a glycol solution circulation path is that a low-temperature glycol solution flows out of a port B of a glycol coil (7), a low-temperature glycol solution enters the first heat exchanger (6) from a port C of the first heat exchanger (6) by closing a first stop valve (8) and opening a third stop valve (10), a high-temperature CO 2 in an analysis tower (5) enters the first heat exchanger (6) from a port E of the first heat exchanger (6), the low-temperature glycol solution and the high-temperature CO 2 are subjected to heat exchange in the first heat exchanger (6), then the F of the first heat exchanger (6) discharges the low-temperature CO 2 after heat exchange, the D of the first heat exchanger (6) flows out of the high-temperature glycol solution after heat exchange, and the D of the first heat exchanger flows into the port a of the glycol coil (7) by closing a second stop valve (9) and opening a fourth stop valve (11).
  8. 8. The method for recycling cold energy of an LNG ship isolation empty room according to claim 7, wherein when the glycol solution circulation path is failed, the third stop valve (10) and the fourth stop valve (11) are closed, and the first stop valve (8) and the second stop valve (9) are opened, so that the glycol solution circulation path is redundant.
  9. 9. The method for recycling cold energy of the isolation capsule of the LNG ship according to claim 8, wherein the redundant glycol circulation path is that low-temperature glycol solution flows out of a port B of the glycol coil (7), flows into the second heat exchanger (13) through the first stop valve (8), exchanges heat with marine steam in the second heat exchanger (13), flows out of the second heat exchanger (13) after exchanging heat with the marine steam, and flows into a port A of the glycol coil (7) through the second stop valve (9) and the glycol pump (12).

Description

Method for recycling cold energy of isolation air cabin of LNG ship Technical Field The invention relates to the technical field of ship construction, in particular to a method for recycling cold energy of an isolation empty cabin of an LNG ship. Background LNG (liquefied natural gas) vessels are supplied with the space between goods in great demand tanks via a glycol system in order to ensure the temperature of the space. Specifically, the glycol solution flows out of the insulation capsule into a heater, which heats the glycol solution with steam, and the heated glycol solution is cooled in the insulation capsule. In the circulation process, a large amount of cold energy obtained from the isolation air cabin by the glycol solution is not effectively utilized, and is directly dissipated through a heating link, so that obvious energy waste is caused, and the development requirement of ship energy conservation is not met. On the other hand, the carbon capture technology is gradually applied to the LNG ship, before the carbon dioxide of the carbon capture system enters the compressor, the carbon dioxide needs to be cooled, at present, the ship generally adopts a fresh water system to cool the carbon dioxide, and the mode not only needs to consume a large amount of cooling fresh water, but also needs to consume a large amount of electric energy of the ship when the cooling pump for driving the fresh water operates, so that the energy consumption and the operation cost of the ship are further increased. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a method for recycling cold energy of an isolation empty cabin of an LNG ship. The present invention achieves the above technical object by the following means. The method is realized based on the structure comprising a first isolation empty cabin, a second isolation empty cabin, a mechanical room and a carbon capture cabin, wherein ethylene glycol coils are arranged in the upper area of the first isolation empty cabin and the upper area of the second isolation empty cabin, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, an ethylene glycol pump and a second heat exchanger are arranged in the mechanical room, an analysis tower and a first heat exchanger are arranged in the carbon capture cabin, and the method is characterized in that an ethylene glycol circulation pipeline is arranged to enable an ethylene glycol solution to circulate among all components, so that cold energy recycling is realized. Further, the first isolation capsule is located between the cabin and the LNG cargo tanks, and the second isolation capsule is located between the two LNG cargo tanks. Further, the glycol coil of the upper region of the first isolation capsule and the glycol coil of the upper region of the second isolation capsule are connected in parallel. Further, the machinery room is arranged on the starboard side of the LNG ship. Further, the structure also comprises an upper building and a cabin shed, wherein the installation place of the glycol circulation pipeline is sequentially provided with a first isolation cabin, a mechanical room, an upper building starboard, a cabin shed starboard, a carbon capture cabin, a cabin shed starboard, an upper building starboard, a mechanical room and a first isolation cabin. Furthermore, the electric heating belt and the insulating layer are bound on the pipeline of the starboard of the superstructure and the pipeline of the starboard of the cabin shed. Further, based on the installation of the glycol circulation pipeline, the glycol solution circulation path is that the low-temperature glycol solution flows out from the port B of the glycol coil, the low-temperature glycol solution enters the first heat exchanger from the port C of the first heat exchanger by closing the first stop valve and opening the third stop valve, the high-temperature CO 2 in the analysis tower enters the first heat exchanger from the port E of the first heat exchanger, the low-temperature glycol solution exchanges heat with the high-temperature CO 2 in the first heat exchanger, then the F port of the first heat exchanger discharges the low-temperature CO 2 after heat exchange, the D port of the first heat exchanger discharges the high-temperature glycol solution after heat exchange, and the high-temperature glycol solution flows into the port A of the glycol coil through the glycol pump by closing the second stop valve and opening the fourth stop valve. Further, when the glycol solution circulation path fails, the third stop valve and the fourth stop valve are closed, and the first stop valve and the second stop valve are opened, so that the glycol solution circulation path is a redundant glycol circulation path. And the redundant glycol circulation path is that the low-temperature glycol solution flows out from the port B of the glycol coil pipe, flows into the second heat exchanger through the fi