The cryogenic CO₂ capture system (also known as cryogenic CO₂ separation unit) is a comprehensive equipment set integrating gas pretreatment, cryogenic cooling, CO₂ condensation, distillation purification, and liquid CO₂ storage.
Its core principle is to first pretreat the CO₂-containing gas to remove impurities that may block or corrode equipment at low temperatures, then cool the gas to near CO₂'s boiling point through a multi-stage refrigeration system-condensing CO₂ into liquid while keeping non-condensable gases (nitrogen, oxygen, methane etc.) in gaseous form for separation.
Finally, liquid CO₂ is purified via distillation to meet industrial or storage standards. It can stably reduce CO₂ content in the treated gas to below 1% (or even <=0.1% for strict emission scenarios) and is a key equipment for high-efficiency carbon capture.
The working process of a Cryogenic Carbon Capture can be summarized as six core steps: gas pretreatment → pre-cooling → cryogenic cooling → CO₂ condensation & separation → CO₂ distillation purification → liquid CO₂ storage/output
CO₂-containing gas (e.g., power plant flue gas with 10-15% CO₂, natural gas with 5-30% CO₂) first enters a pretreatment system. It passes through a filter to remove solid particles (dust, ash) with particle size >=5 μm, then enters a dehydration unit (molecular sieve adsorber) to reduce water content to below 10 ppm (avoiding ice formation that blocks pipelines at low temperatures). For gas with sulfur compounds (H₂S >=20 ppm), a desulfurization unit (activated carbon adsorption or amine scrubbing) is added to remove H₂S-preventing corrosion of cryogenic equipment and avoiding sulfur impurities in captured CO₂.
Pre-cooling: Pretreated gas enters a pre-cooler, where it exchanges heat with low-temperature tail gas (non-condensable gases after CO₂ separation) and cooling water. The gas temperature is reduced from ambient temperature (20-30℃) to 0 ~ -10℃, preliminarily removing most of the remaining moisture and light hydrocarbons (e.g., methane in natural gas).
Pre-cooled gas enters a multi-stage cryogenic refrigeration system (typically using propane pre-cooling + mixed refrigerant cycle). The first stage uses propane to cool the gas to -40 ~ -50℃; the second stage uses a mixed refrigerant (composed of nitrogen, methane, ethane, propane) to further cool the gas to -55 ~ -60℃-reaching the temperature range where CO₂ condenses.
The cryogenically cooled gas enters a separator. At -55 ~ -60℃ and 1.0 ~ 6.0 MPaG, CO₂ condenses into liquid (density ~1.1 g/cm³), while non-condensable gases (nitrogen, oxygen, residual methane) remain gaseous. The liquid CO₂ is collected at the bottom of the separator, and the non-condensable gases are discharged from the top-after heat recovery in the pre-cooler, they are either emitted (meeting environmental standards) or recycled (e.g., natural gas components returned to the pipeline).
Crude liquid CO₂ (containing trace non-condensable gases and impurities) is sent to a distillation tower. Under reduced pressure (0.3 ~ 0.5 MPaG) and controlled temperature (-50 ~ -55℃), trace gaseous impurities (nitrogen, oxygen) are separated from the top of the tower, while high-purity liquid CO₂ (purity >=99.0%) is collected at the bottom. For scenarios requiring ultra-high purity (e.g., food-grade CO₂), a second-stage distillation unit is added to improve purity to >=99.9%.
Purified liquid CO₂ is pumped to insulated cryogenic storage tanks (maintained at -56.6℃ and 0.5 ~ 1.0 MPaG) for temporary storage. It can be directly transported to users via cryogenic tank trucks (for industrial use such as food carbonation, metal welding), or compressed to supercritical CO₂ (31℃, 7.38 MPa) for pipeline transportation to geological storage sites or enhanced oil recovery (EOR) projects.
Under standard configuration, CO₂ capture efficiency is >=95%; with optimized refrigeration and distillation processes, it can reach 99.5%, suitable for scenarios with strict carbon emission requirements (e.g., power plants, steel mills).
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Captured liquid CO₂ purity is >=99.0%, and ultra-high purity (>=99.9%) can be achieved through secondary purification-meeting industrial, food, and medical-grade standards.
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Single-unit daily processing capacity ranges from 5,000 Nm³/h to 300,000 Nm³/h, adapting to medium-scale (regional heating boilers) to large-scale (1000 MW power plants) gas streams.
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The process relies on physical cooling and separation, without consuming chemical solvents (e.g., amines) that require regeneration-avoiding solvent degradation, wastewater discharge, and chemical replacement costs.
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Can be integrated with existing industrial systems (e.g., power plant flue gas ducts, natural gas processing plants) with minimal modification to the original process, reducing project investment and construction cycles.
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In the context of global carbon neutrality and strict industrial emission regulations, refined design is the cornerstone of ensuring cryogenic capture efficiency, energy conservation, and operational safety. Our company has a team of professional engineers with over 30 years of experience in cryogenic technology and carbon capture, familiar with domestic and foreign standards such as GB 150 (pressure vessels), ASME BPVC (cryogenic equipment), ISO 14064 (carbon accounting), and EPA Method 315 (CO₂ detection). We provide customized design based on customer gas properties (CO₂ concentration, impurity composition), operating pressure, and output requirements: for flue gas systems, we optimize the pre-cooling heat exchange network to reduce refrigeration energy consumption; for natural gas systems, we design a hydrocarbon recovery unit to recycle methane while capturing CO₂. We abandon "one-size-fits-all" templates and conduct detailed cryogenic process simulation (via Aspen HYSYS) for each project-ensuring the system's energy consumption is 10-15% lower than industry averages.
Our company strictly implements the ISO9001 quality management system throughout the entire project lifecycle, covering design, procurement, manufacturing, and commissioning. During the design phase, senior engineers conduct cross-verification of cryogenic equipment parameters (e.g., heat exchanger area, refrigerant flow rate) and structural strength calculations to eliminate design risks; key components (cryogenic heat exchangers, refrigeration compressors, storage tanks) are sourced from well-known brands (e.g., Chart Industries cryogenic heat exchangers, Bitzer refrigeration compressors) and undergo incoming inspection in accordance with technical specifications (e.g., low-temperature toughness testing of materials, leakage rate testing of equipment). During manufacturing, cryogenic pipelines and pressure vessels undergo non-destructive testing (UT for welds, RT for thick-walled parts) and cryogenic performance testing (cooling to -60℃ for 24 hours to verify sealing); before delivery, the system undergoes 100-hour continuous operation testing-verifying CO₂ capture efficiency, purity, and energy consumption-to ensure all indicators meet design requirements.
We regard product quality as the lifeline of the enterprise and are committed to delivering "zero-fault" cryogenic capture systems. Each system undergoes multi-level quality control: cryogenic equipment uses materials with excellent low-temperature performance (e.g., 304L stainless steel for pipelines, aluminum alloy 5083 for heat exchangers) with a design life of >=20 years; the refrigeration system is equipped with dual redundant compressors to avoid shutdown due to single-machine failure; the system's mean time between failures (MTBF) exceeds 12,000 hours. We provide complete quality certification documents, including material low-temperature performance reports, non-destructive testing reports, and system performance test reports, and ensure the factory qualification rate of products is 100%.
Efficient after-sales service is critical to ensuring the continuous and stable operation of cryogenic equipment. When receiving a customer service request, our technical team provides initial feedback within 12 hours (24/7) via phone, email, or video conference-including problem diagnosis (e.g., reduced capture efficiency caused by refrigerant leakage) and preliminary solutions. For issues that can be resolved remotely (e.g., refrigeration parameter adjustment, temperature control calibration), we guide customers to complete troubleshooting within 24 hours; for on-site maintenance needs (e.g., heat exchanger cleaning, valve replacement), we dispatch engineers with cryogenic technology expertise within 48 hours (domestic) or 72 hours (international) after confirming the demand. We also provide regular preventive maintenance services (e.g., annual cryogenic tank insulation inspection, refrigerant purity analysis) and spare parts supply guarantees-minimizing equipment downtime and ensuring long-term stable operation.
Our Cryogenic CO₂ Capture System systems are widely recognized by leading enterprises in the energy, steel, and natural gas industries due to their high efficiency, reliability, and low energy consumption. Typical customers include: China Huaneng Group (power plant flue gas CO₂ capture), ArcelorMittal (steel mill off-gas decarbonization), QatarEnergy (natural gas CO₂ separation), and Linde (industrial CO₂ recovery projects). Their long-term cooperation and repeat orders are a testament to our product quality and service level.
● Turnkey project supply: Provide integrated services from design, manufacturing, installation to commissioning-delivering a fully operational Cryogenic Carbon Capture;
● Equipment sales: Sell core cryogenic components (cryogenic heat exchangers, refrigeration units, liquid CO₂ storage tanks) separately for customers with self-installation and integration capabilities;
● Operation and maintenance service: Undertake long-term operation and maintenance of the system, charging based on service period or CO₂ capture capacity-reducing customer's operational management pressure;
● Carbon capture service: Invest in and operate the cryogenic capture system, charge customers based on the amount of CO₂ captured-helping customers avoid large upfront investment in equipment.
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High capture efficiency (>=95%), high CO₂ purity (>=99%), no chemical solvent consumption |
Large-scale power plants, steel mills, natural gas processing (CO₂ concentration 5-30%) |
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Amine-based chemical absorption |
Power plant flue gas (CO₂ concentration 5-15%), small to medium-scale industrial off-gas |
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CO₂ is dissolved in low-temperature, low-volatility physical solvents, then desorbed by pressure reduction |
Sour natural gas (CO₂ >=20%), chemical off-gas with high impurity content |
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Small-scale scenarios (e.g., distributed power generation), offshore gas fields (CO₂ concentration 1-10%) |
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Small-scale gas streams with low CO₂ concentration (<=5%), such as small boiler flue gas |
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