Carbon Capture, Utilization and Storage (CCUS)
Business Overview
The carbon capture business currently focuses on capturing and treating carbon dioxide (CO₂) emissions generated during the production of Bio-Liquefied Natural Gas (Bio-LNG). In the Bio-LNG production process, high-concentration CO₂ is separated during the biogas purification and decarbonization stage. This CO₂ originates from the natural carbon cycle of biomass and is therefore classified as biogenic carbon dioxide. Through advanced technologies such as physical adsorption (e.g., pressure swing adsorption), chemical absorption (e.g., amine-based absorption), membrane separation, and cryogenic separation, CO₂ is efficiently captured from the decarbonization process. It is then subjected to compression, purification, and transportation, ultimately enabling geological storage, resource utilization, or chemical synthesis. Since biomass feedstocks absorb CO₂ from the atmosphere through photosynthesis during their growth, capturing and storing the CO₂ generated during production enables net carbon removal, allowing the overall system to achieve negative carbon emissions.
Composition of the Carbon Capture System
Capture System
The core components include absorption towers (using chemical solvents such as amine solutions), adsorption towers (utilizing solid adsorbent materials), membrane separation units, or cryogenic separation systems. The appropriate technology is selected based on the concentration and scale of the emission source.
Compression and Purification System
The captured CO₂ is compressed to a supercritical state, and impurities such as moisture and sulfides are removed to meet the requirements for transportation or downstream utilization.
Transportation and Injection System
This includes transportation via pipelines, tank trucks, or ships, as well as injection wells, monitoring wells, and related surface facilities for geological storage.
Utilization and Storage System
On the utilization side, this includes reactors and storage tanks for resource conversion; on the storage side, it comprises geological monitoring systems and leakage detection and early warning systems.
Auxiliary Support Systems
These cover energy supply (electricity and heat), control systems, safety protection (leak prevention and emergency response), as well as carbon measurement and verification platforms.
Key Advantages of Carbon Capture Technologies
Deep Emission Reduction Potential
Carbon capture is particularly suitable for hard-to-electrify heavy industries, achieving CO₂ capture rates of 80%–95%. Technology pathways such as BECCS (Bioenergy with Carbon Capture and Storage) can even enable negative emissions.
Diverse Technology Pathways
It encompasses pre-combustion, post-combustion, oxy-fuel combustion, and direct air capture technologies, allowing flexible adaptation to different emission source conditions.
Policy and Market Drivers
Carbon capture benefits from carbon trading and carbon tax mechanisms, enabling revenue generation through carbon credit sales. In addition, some countries provide subsidies or impose mandatory emission reduction requirements.
Industrial Synergies
Captured CO₂ can be utilized across industries such as chemicals, agriculture, and energy, creating new value chains. Integration with hydrogen energy and renewable energy systems can further enhance overall system efficiency.
Modularity and Scalability
Particularly for DAC (Direct Air Capture—a negative emission technology that extracts CO₂ directly from the atmosphere) and small to medium-scale capture projects, containerized or skid-mounted modules can be adopted, enabling rapid deployment and flexible capacity expansion.
CO2 Application Scenarios
Carbon Storage and Geological Sequestration
Compressed CO₂ can be injected into deep geological formations—such as depleted oil and gas reservoirs or saline aquifers—for permanent storage. This process requires supporting monitoring and verification systems to ensure long-term safety and integrity.
