How to choose an oil-free lubricated air compressor for instant noodle production
In the production of instant noodles, the compressed air system is the core power source to support the operation of automated equipment, but its potential oil pollution risks may have a significant impact on food safety, equipment life and production costs. Due to their technical characteristics, Oil-Free Water-Lubricated Air Compressors have become a necessary choice to meet international food hygiene standards. This paper systematically analyzes the selection logic of oil-free lubricated air compressors from the perspective of production process requirements, technical parameter adaptability, risk avoidance and economy.
1. Application scenarios and oil-free requirements of compressed air in instant noodle production process
According to ISO 8573-1:2010 “Quality Classification Standards for Compressed Air”, food contact grade compressed air must meet Class 0 (oil-free) Requirements. The following aspects of instant noodle production are particularly sensitive to air quality:
- dough kneading and calendering processes
- Compressed air is used in pneumatic valves and dough conveying systems to directly contact raw materials. Oil residues may lead to microbial growth or chemical contamination of the dough, violating the HACCP (Hazard Analysis Critical Control Point) principles.
- Cooking and frying processes
- In a high temperature environment, lubricating oil from traditional oil-containing air compressors may volatilize and enter frying equipment with compressed air, forming carcinogens (such as polycyclic aromatic hydrocarbons), violating EU EC 1935/2004 Food Contact Materials Regulations.
- Cooling and packaging processes
- Compressed air is used to inflate and seal packaging bags. Residual oil will cause the adhesion failure of packaging materials and contaminate the product surface, triggering a non-compliance risk of the ISO 22000 food safety management system.
2. Selection of key parameters for oil-water-lubricated air compressors
According to ISO 1217:2009 “Acceptance Test for Positive Displacement Compressors” and ISO 50001 energy efficiency standards, the following technical parameters should be paid attention to in selection:
| parameter categories | technical requirements |
|---|---|
| exhaust pressure | Adapt to the needs of instant noodle production lines, usually 0.7–1.0 MPa(10% redundancy needs to be reserved) |
| exhaust volume | Calculated based on the total air consumption of pneumatic equipment (e.g., required for a single production line 5–50 m³/min, adjusted according to scale) |
| exhaust temperature | ≤ ambient temperature +10 ° C (after-cooler is required, complying with ISO 7183 cooler standard) |
| energy efficiency rating | Comply with ISO 50001 Level 1 energy efficiency, specific power (kW/m³/min) ≤5.5 |
| noise level | ≤70 dB(A)(according to ISO 2151 noise test standard) |
| water treatment system | Circulating water filtration accuracy ≤0.01μm (prevents scale clogging, complies with ISO 3690 water quality standard) |
3. Risks and consequences of using oily air compressors
- food safety risk
- Lubricating oil molecules (C10-C50 hydrocarbons) may migrate to foods through compressed air, violating FDA 21 CFR §113.100 or EFSA Food Contact Materials Specifications, resulting in product recalls.
- equipment maintenance cost
- Oil accumulation in the pipeline requires frequent replacement of the filter element (replacement every 500 hours, increasing the cost by more than 30%), and oil pollution may block pneumatic components (such as a 50% increase in the failure rate of solenoid valves).
- environmental compliance
- Oil mist emissions exceed EPA 40 CFR Part 63 or EU Directive 1999/13/EC limits and risk fines or production suspension.
4. The core benefits of oil-free lubricated air compressors
- Zero pollution compliance
- It has passed ISO 8573-1 Class 0 certification and meets the requirements of Global Food Safety Initiative (FSSC 22000) such as BRCGS and IFS.
- Lifecycle cost optimization
- Lubricating oil procurement (annual savings of approximately US$12,000/100kW equipment) and oil filter replacement costs are eliminated, and the maintenance cycle is extended to 8000 hours.
- energy efficiency improvement
- The friction loss of water lubrication technology is 15 – 20% lower than that of oil lubrication. Combined with permanent magnet frequency conversion technology (IE4 motor standard), the comprehensive energy saving is more than 30%.
5. Performance comparison between oil-free lubrication and oil-free air compressor
| comparative dimension | Oil-water lubricated air compressor | oil-lubricated air compressor |
|---|---|---|
| air quality | Class 0 (100% oil free) | Class 1-4 (Oil content 0.1 – 5 mg/m³) |
| maintenance costs | No need for lubricants and reduce maintenance costs by 40% | Annual lubricating oil consumption accounts for 15% of the total equipment cost |
| energy consumption efficiency | Specific power ≤5.5 kW/m³/min | Specific power ≥6.8 kW/m³/min |
| equipment life | Rotor life ≥100,000 hours (no oil corrosion) | Due to carbon deposition, it needs to be overhauled every 3 years, with a life span of ≤60,000 hours |
| environmental adaptability | Stable operation at high temperatures (40°C+) and high humidity | High temperatures can easily cause oxidation of lubricating oil and reduce efficiency by 20% |
VI. Conclusion
In the production of instant noodles, oil-free lubricated air compressors have become necessary equipment to ensure food safety and economic benefits by eliminating the risk of oil pollution, reducing compliance costs and improving energy efficiency. Enterprises should give priority to matching ISO international standard parameters when selecting models, and conduct technical verification based on production line size, gas volume requirements and local environmental protection regulations to ensure long-term stable operation and global market access qualifications.