CO₂ Recovery Unit for Brewery Fermentation Gas
The modular package integrates raw gas collection headers, multi-stage water washing, oil-free gas compression, activated carbon organic filtration, twin-tower desiccant drying, non-condensable stripping, sub-cooling liquefaction, and central process controls.
Introduction
An industrial gas recovery unit designed to collect, purify, and liquefy raw fermentation off-gas from brewery cellars.
The modular package integrates raw gas collection headers, multi-stage water washing, oil-free gas compression, activated carbon organic filtration, twin-tower desiccant drying, non-condensable stripping, sub-cooling liquefaction, and central process controls.
Technical Specifications
|
Parameter |
Specification |
|
CO₂ Recovery Rate |
90.0%–92.1% |
|
Recovery Losses |
Venting, regeneration blowdown, non-condensable gases |
|
Specific Energy Consumption |
110–140 kWh/t CO₂ |
|
Cooling Water Temperature |
25°C |
|
Instrument Air Pressure |
6–7 bar(g) |
|
Media Service Life |
8,000–12,000 operating hours |
|
Control System |
Siemens S7-1500 / Allen-Bradley PLC |
|
Safety Interlocks |
Pressure, lubrication, and temperature fault shutdown |
|
Purity Protection |
Automatic off-spec gas diversion |
|
Overpressure Protection |
Safety relief valves and rupture discs |
|
CO₂ Safety Integration |
Ambient CO₂ monitoring and emergency ventilation |
CO₂ Recovery Capacity
Nominal Recovery Capacity: Available in standard skid sizes from 50 kg/h to 1,500 kg/h (approx. 1.2 to 36 t/day) of purified liquid CO₂ product.
Inlet Gas Operating Range: Designed for raw fermentation off-gas entering at 95% to 99% v/v CO₂ concentration (dry basis) under low-pressure cellar collection conditions (10–50 mbar gauge).
Low-Concentration Venting Logic: If raw gas concentration drops below 95% v/v during initial cellar blow-off, an automated sensor-driven 3-way divert valve routes the stream to an external safe exhaust stack.
Brewery Scale Alignment: Sized for regional craft breweries through multi-million HL industrial facilities processing annual production volumes from 100,000 HL to over 3,000,000 HL.
CO₂ Quality
Final Product Purity Target: Engineered to achieve a target CO₂ purity of 99.99% v/v on a dry basis under rated operating parameters.
Key Impurity Thresholds: Oxygen (O₂) ≤ 5–10 ppm v/v; Moisture (H₂O) ≤ 10 ppm v/v (dew point below -60°C); total volatile organic hydrocarbons ≤ 5 ppm v/v.
Guideline Alignment: Equipment process engineering follows the quality and safety principles outlined in ISBT and EIGA beverage-grade CO₂ guidelines.
Analytical Verification: Process verification utilizes continuous online trace-oxygen and dew-point monitoring, with certified third-party laboratory batch analysis reports available upon request.
Impurity Removal
Foam Separation and Water Scrubbing: Stainless steel foam separator followed by a packed water wash tower removes entrained foam, water-soluble esters, and residual ethanol vapors.
Organic Hydrocarbon Absorption: Dual active carbon vessels strip trace volatile organic compounds (VOCs), aldehydes, and organic aroma compounds.
Gas Dehydration: Twin-tower molecular sieve desiccants adsorb moisture from the gas stream to prevent ice formation in downstream sub-cooling heat exchangers.
Non-Condensable Stripping: A distillation column separates remaining entrained oxygen, nitrogen, and argon from the liquefied product stream.
Liquid CO₂ Storage Capacity
Storage Vessel Options: Vacuum-insulated steel pressure tanks from 5 m³ to 50 m³ (design pressure 22 bar gauge) are available as selectable system options.
Transfer Interfaces: Main skid discharge piping terminates in standard flanged manifolds suitable for connection to optional storage tanks, existing site storage, or external tank truck loading lines.
Downstream Supply Components: Optional ambient or steam-heated vaporizers convert stored liquid back to gaseous CO₂ for counter-pressure filling, tank blanketing, and bottle purging.
Installation Requirements
Cellar Tie-in: Direct flanged connection to the central cellar collection header, featuring sanitary stainless steel check valves and inline foam detection sensors.
Footprint Requirements: Equipment requires installation within a covered or indoor facility.
Utility Terminal Points: Standard flanged connections for cooling water supply/return, instrument air, main power distribution, and product delivery lines.
Electrical Supply Options: Configured at the factory for 380V, 415V, or 460V, 3-Phase, 50/60 Hz to match regional project site power standards.
Equipment Compliance
Pressure Vessels: Designed and manufactured to ASME Section VIII, Division 1 or GB 150, according to regional requirements.
Materials: SS304/SS316L is used for wetted parts and product piping, while coated carbon steel is used for structural frames.
Welding and NDT: Certified welders perform SAW and TIG welding. Pressure-retaining seams undergo applicable NDT, including RT and UT.
Factory Testing: All pressure vessels, piping assemblies, and valve manifolds undergo hydrostatic and pneumatic leak testing before shipment.
Quality Management: Manufacturing is conducted under an ISO 9001-certified quality management system.
FAQ
Q: Should I recover CO₂ or continue buying liquid CO₂?
A: Recovery is generally suitable for breweries producing more than 300,000 HL annually with steady CO₂ demand. Smaller breweries or those with seasonal demand may find purchased CO₂ more economical.
Q: What is the estimated equipment cost?
A: A 300 kg/h unit typically costs USD 0.35–0.6 million, while a 1,500 kg/h unit costs approximately USD 1.2–2.0 million, excluding storage tanks, civil works, and import duties.
Q: How much CO₂ can a brewery recover?
A: A brewery generates approximately 2.5–3.5 kg of CO₂ per hectoliter of beer.
Q: Why must fermentation gas contain more than 95% CO₂?
A: Early fermentation gas contains air, which increases oxygen and nitrogen levels.
Q: What does the energy consumption include?
A: Typical energy use is 110–140 kWh/t, covering gas compression, drying, liquefaction, and auxiliary systems.
Q: How long do the adsorbents last?
A: Activated carbon typically lasts 8,000–12,000 hours, or approximately 1–1.5 years. Molecular sieve media generally lasts 3–5 years.
Q: How is beverage-grade purity verified?
A: Online analyzers continuously monitor oxygen and dew point. Laboratory testing verifies benzene, acetaldehyde, ethanol, total hydrocarbons, and sulfur compounds against applicable ISBT requirements.
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