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CN-121177955-B - Shipborne double-phase absorbent carbon trapping system based on centrifugal phase separation-coalescence-heat exchange integrated device

CN121177955BCN 121177955 BCN121177955 BCN 121177955BCN-121177955-B

Abstract

The invention relates to a marine exhaust gas treatment system, in particular to a shipborne double-phase absorbent carbon trapping system based on a centrifugal phase separation-coalescence-heat exchange integrated device. The invention provides a high-efficiency low-energy-consumption shipborne carbon capture system based on a centrifugal phase separation-coalescence-heat exchanger, which combines a centrifugal phase separator, a heat exchanger and a coalescer, and (3) carrying out heat exchange and centrifugal phase separation on the lean and rich liquid flowing out from the bottom of the absorption tower in a centrifugal phase separation-coalescence-heat exchange integrated device. The technology not only reduces the reheating, temperature rising and centrifugal separation required after the phase separator, but also can effectively solve the problem of low phase separation process efficiency caused by ship shaking, and the combination of the phase separator and the centrifugal heat exchanger effectively reduces the equipment size and the equipment occupied area.

Inventors

  • LI XIAOBO
  • SUN YANSONG
  • WANG JIE
  • PAN HAOJIE

Assignees

  • 浙江菲达澜创环保科技有限公司

Dates

Publication Date
20260505
Application Date
20251020

Claims (6)

  1. 1. A ship-borne dual-phase absorbent carbon capture system based on a centrifugal phase separation-coalescence-heat exchange integrated device is characterized by comprising an absorption tower (2), the centrifugal phase separation-coalescence-heat exchange integrated device (8), a mixer and a regeneration tower (13), wherein a dual-phase absorbent inlet (12) is arranged on the absorption tower (2), the centrifugal phase separation-coalescence-heat exchange integrated device (8) comprises a centrifugal phase separator with a shell structure and a coalescer (89) which is in fluid communication with a shell layer of the centrifugal phase separator, heat exchange tubes (84) are spirally wound on the inner tube side of the centrifugal phase separator and the outer surface of the coalescer (89), an inlet of each heat exchange tube (84) is connected with a regeneration tower lean solution outlet (134) at the bottom of the regeneration tower (13), an outlet of each heat exchange tube (84) is connected with a regeneration tower lean solution inlet (92) of the mixer, a tube side of the centrifugal phase separator is communicated with the bottom of the shell layer, a post-phase separation liquid outlet (86) connected with the mixer (9) and a post-phase separation rich solution outlet (88) connected with the regeneration tower (13) are arranged on the tube layer of the centrifugal phase separator, the mixer (9) is provided with a mixed dual-phase absorbent outlet (95) connected with the dual-phase absorbent inlet (12), a lean-rich mixed liquid inlet (82) of the coalescer (89) is connected with a lean-rich mixed liquid outlet (6) at the bottom of the absorption tower, a phase separation stirrer (81) is arranged in an inner pipe layer of the centrifugal phase separator, coalescing fibers are filled in the coalescer (89), the bottom of a shell side of the centrifugal phase separator is also filled with the coalescing fibers, a regeneration tower lean liquid inlet (92) connected with a heat exchange pipe outlet (87), a split-phase lean liquid inlet (93) connected with a split-phase lean liquid outlet (86), a dual-phase absorbent supplementing port (94) and a mixed dual-phase absorbent outlet (95) are arranged on a shell of the mixer (9), and the stirrer (91) is arranged in the mixer (9).
  2. 2. Carbon capture system according to claim 1, characterized in that absorption packings (3) are arranged at intervals in the absorption tower (2), and inter-stage coolers (5) are arranged between adjacent absorption packings (3).
  3. 3. The carbon capture system according to claim 1, characterized in that the regeneration tower (13) is internally filled with regenerated catalyst packing for reducing the desorption temperature of the rich liquid.
  4. 4. The carbon capture system according to claim 1, wherein the regeneration tower (13) is provided with a reboiler (19) and a preheater (18) connected in sequence at the bottom.
  5. 5. The carbon capture system according to claim 4, wherein the top of the regeneration tower (13) is connected to a heat pump system (17), and the heat pump system (17) is connected to a CO 2 liquefaction unit (20) after exchanging heat with the preheater (18).
  6. 6. The carbon capture system according to claim 1, characterized in that a cooling tower (1) is connected upstream of the absorption tower (2), and a demister (4) is arranged at the top of the absorption tower (2).

Description

Shipborne double-phase absorbent carbon trapping system based on centrifugal phase separation-coalescence-heat exchange integrated device Technical Field The invention relates to a marine exhaust gas treatment system, in particular to a shipborne double-phase absorbent carbon trapping system based on a centrifugal phase separation-coalescence-heat exchange integrated device. Background With the rapid development of the global shipping industry, the carbon emission of ships has become an important concern in international climate control. The carbon dioxide emission generated by the combustion of the traditional shipping fuel has increasingly significant contribution to global greenhouse effect, and the existing emission reduction means (such as fuel substitution and energy efficiency optimization) are limited by technical maturity and economy, so that the long-term deep decarburization requirement is difficult to meet. Under the background, the shipborne carbon capture and sequestration technology provides a solution compatible with the existing power system and having large-scale emission reduction potential for the shipping industry by directly separating carbon dioxide from the ship tail gas. The technology not only can fill the coverage blank of the existing emission reduction measures, but also can provide a low-carbon transformation path for the scenes of ocean vessels and the like which are difficult to replace by shore power or zero-carbon fuel, and has a key supporting effect on pushing the global shipping industry to achieve the aim. Traditional chemical absorbents, such as MEA, face the challenges of high regeneration energy consumption, strong equipment corrosiveness and the like in the carbon capture process, and limit the large-scale application efficiency of the traditional chemical absorbents. The two-phase absorbent automatically forms a rich liquid phase and a lean liquid phase after absorbing carbon dioxide by introducing a phase separation mechanism, thereby realizing selective enrichment of target gas. This feature allows the regeneration process to be performed only by heating the rich liquid phase, greatly reducing the energy consumption and reducing the losses of the absorbent during the cycle. The prior art (CN 118698303A) discloses a dynamic phase-separation carbon dioxide trapping system based on a phase-change absorbent, which is provided with a coalescing device, a centrifugal phase separator, a mixing tank, a heat exchanger and other devices between an absorption tower and an analysis tower, and can realize the high-efficiency phase separation of the phase-change absorbent by utilizing the technology of coupling the coalescing filler with the centrifugal phase separation. However, this system is not suitable for carbon capture of ships, and the space of ships is small mainly, and the arrangement of a plurality of independent devices inevitably increases the occupation area of the carbon capture system. Moreover, the aggregation and centrifugal phase separation adopted in the prior art can cause poor aggregation and phase separation effects due to mixing of lean and rich solutions caused by shaking of a ship, and thus the problem of high regeneration energy consumption of on-board carbon capture is caused. Therefore, how to improve the phase separation effect on the basis of reducing the occupied area of the whole system is a problem to be solved. Disclosure of Invention Aiming at the problems, the invention provides a ship-borne carbon capture system based on a centrifugal phase separation-coalescence-heat exchanger, which combines a centrifugal phase separator, a heat exchanger and a mixer, and performs heat exchange and centrifugal phase separation on lean and rich liquid flowing out from the bottom of an absorption tower in a centrifugal phase separation-coalescence-heat exchange integrated device. The technology not only reduces the reheating, temperature rising and centrifugal separation required after the phase separator and can effectively improve the phase separation process efficiency, but also combines the phase separator and the centrifugal heat exchanger to effectively reduce the equipment size and the equipment occupied area. The invention provides a shipborne dual-phase absorbent carbon capture system based on a centrifugal phase separation-coalescence-heat exchange integrated device, which comprises an absorption tower (2), a centrifugal phase separation-coalescence-heat exchange integrated device (8), a mixer and a regeneration tower (13), wherein the absorption tower (2) is provided with a dual-phase absorbent inlet (12), the centrifugal phase separation-coalescence-heat exchange integrated device (8) comprises a centrifugal phase separator with a shell structure and a coalescer (89) which is in fluid communication with a shell layer of the centrifugal phase separator, the inner tube side of the centrifugal phase separator and the outer surface of the coalescer