High-Gravity Gas Absorption Unit

High-Gravity Carbon Capture，HGCC（Carbon Dioxide Absorption）

The baffle-type rotating bed is a highly efficient gas-liquid mass transfer device that intensifies the mass transfer process through centrifugal force. It is widely used in carbon capture (CO₂ capture) applications. Its core principle utilizes high-speed rotation to disperse liquid into ultra-thin films or micro-droplets, dramatically expanding the gas-liquid contact area and thereby significantly enhancing CO₂ absorption efficiency.

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Technical Parameters

Working Principle:
High-speed rotation (typically hundreds to thousands of RPM) drives liquid entering from the center toward the outer edge under centrifugal force, forming ultra-thin liquid films or micron-sized droplets. Gas and liquid undergo countercurrent contact: gas flows inward from the periphery while chemically absorbing CO₂ via absorbents (e.g., amine solutions, NaOH).

Mass Transfer Enhancement: High centrifugal forces (hundreds of times gravity) drastically reduce mass transfer resistance, increase mass transfer coefficients (K<sub>a</sub>), and shorten reaction time.

Carbon Capture Process Flow:
1. Absorption Stage: Flue gas enters the rotating bed where CO₂ reacts with absorbents (e.g., MEA, DEA) to form rich solvent.
2. Desorption Stage: Rich solvent is heated in a regeneration tower to release CO₂, allowing absorbent recycling.
3. Compression & Storage: Released CO₂ is compressed for sequestration/utilization.

Industrial Trials: Pilot-scale deployments on ships and chemical plants demonstrate capture efficiency exceeding 90%.

High-Grevity Carbon Capture Technology—with its high efficiency, compact footprint, and energy-saving advantages—represents a breakthrough for carbon capture, particularly suited for medium/small-scale emitters and space-constrained sites. Advancements in materials and control systems will enable broader adoption in coal-fired plants, chemical industries, and marine applications, accelerating progress toward carbon neutrality goals.

About Exhaust Gas Treatment

Conventional column equipment uses its internal structure to facilitate mass and heat transfer between gas and liquid, thereby accomplishing processes like absorption and reaction. This is primarily achieved by leveraging the physical and chemical properties of the gas and liquid phases.

● Absorption Process: In physical absorption, target components from the gas phase are transferred to a liquid absorbent through direct contact with the exhaust gas. Common absorbents include water, kerosene, fuel, and various solvents. This process can be used to transfer any soluble organic matter from the gas to the liquid phase, where the resulting absorbent solution is then treated.

● Reaction Process: For chemical absorption, target components in the gas phase are transferred to the liquid absorbent via direct contact with the exhaust gas. The absorbent then chemically reacts with the solute. The absorbent's composition is determined by the target components, such as acidic gases like SO2, H2S, CO2, or HCl. In some processes, the absorbent can be recycled; for example, alkaline gases like NH3 are often absorbed using a sodium chloride or water solution. Any component in the gas phase can be moved to the liquid phase if it can either dissolve in or react with an absorbent.

The efficiency of exhaust gas treatment is contingent upon several factors, including the mode of operation, process control conditions, absorbent performance, and the structural attributes of the absorption unit.

Case Description:


A certain shipping company		A certain shipping company
High-Gravity Absorption-Desorption System: CX650 + CX650		High-Gravity Absorption-Desorption System: CX750+CX650
Main Equipment: Exhaust gas cooling heat exchanger; High-gravity absorber with vapor-liquid separator; High-gravity desorber, evaporator, and regeneration heat exchanger; Circulating cooling water system; Thermal oil heating system		Main Equipment: Combustion-based exhaust gas simulation system; Flue gas desulfurization (FGD) quenching & scrubbing tower with heat exchanger; High-gravity absorber, vapor-liquid separator, heat exchanger; High-gravity desorber, vapor-liquid separator, evaporator, heat exchanger; Compression & liquefaction system; Circulating cooling water system; Steam heating system
Exhaust Gas Inlet CO₂ Concentration	～7.5%	Exhaust Gas Inlet CO₂ Concentration	～5%
Exhaust Gas Outlet CO₂ Concentration	～0.75%	Exhaust Gas Outlet CO₂ Concentration	～0.5%
Desorbed CO₂ Concentration	>99.8%	Desorbed CO₂ Concentration	>99.8%
Absorbent Type	Alcoholamine composite absorbent	Absorbent Type	MEA-based Composite Absorbents
Exhaust Gas Flow Rate	200m³/h	Exhaust Gas Flow Rate	500m³/h
Operating Pressure	Atmospheric pressure	Operating Pressure	Atmospheric pressure