What kind of compressor is generally used for factory gas source

The selection of compressors for factory air sources should be based on process requirements, air quality requirements and operating costs. Common types include oil-free water-lubricated air compressors, oil-injected screw air compressors and centrifugal air compressors. among them, air compressor without oil and water lubrication because of its advantages in clean gas source, energy efficiency and maintenance, it is becoming the core equipment of food, medicine, electronics and other industries. The following is a specific analysis:

common types and applicable scenarios of air source compressors in 1. factories

  1. oil-injected screw air compressor
    • principle: The rotor is sealed and cooled by injecting lubricating oil. The oil content of compressed air needs to be reduced to 0.01-0.1 mg/m & sup3; through post-treatment equipment (such as oil separator and precision filter);.
    • Applicable Scenarios: General industrial scenarios with low air quality requirements (such as machining, pneumatic tool drive), the initial investment cost is low, but the oil filter element needs to be replaced frequently for long-term operation, and the maintenance cost is high.
  2. Air compressor without oil and water lubrication
    • principle: Replace lubricating oil with pure water, form sealing and cooling through water film, and compress oil content of air towards zero(≤ 0.01 mg/m & sup3;), no post-treatment degreasing equipment is required.
    • Applicable Scenarios:
      • food Industry rice processing, flour production, beverage filling and other processes that require direct contact with the product;
      • pharmaceutical industry: Scenarios with strict requirements for air cleanliness, such as drug packaging and sterile preparation production;
      • electronic industry: Semiconductor manufacturing, PCB cleaning and other processes that need to avoid oil contamination of precision components.
  3. centrifugal air compressor
    • principle: The centrifugal force is generated by the high-speed rotating impeller to compress air, and the non-contact design realizes oil-free compression.
    • Applicable Scenarios: Continuous high-load gas supply for large factories (such as steel and chemical industry), but the initial investment is high, and the air intake quality is strict (pre-dust removal equipment is required).

The core advantage of 2. oil-free water lubrication air compressor

  1. zero risk of oil pollution
    • pure water lubrication technology completely eliminates the possibility of oil entering the gas path and avoids contamination of the product. For example, in the rice processing line, oil-free compressed air can prevent oil film from adhering to the surface of rice grains, ensuring the appearance quality and food safety.
  2. Energy efficient and low maintenance
    • water film heat dissipation advantage: The specific heat capacity of water is more than twice that of traditional lubricating oil, the heat dissipation efficiency is high, the equipment temperature rise is low, the specific power is optimized by about 8%, and long-term operation can save a lot of electricity bills.
    • Long life design: The core components (such as screw rotor) are made of corrosion-resistant materials (such as stainless steel or PEEK composite materials), the theoretical life exceeds 80,000 hours, and the maintenance period is extended to 4000-8000 hours.
    • Modular structure: 30% smaller than traditional models, making it easy to deploy in space-constrained factories.
  3. Intelligent Control and Stability
    • frequency conversion regulation technology: Automatically adjust the speed according to the gas demand to realize "on-demand gas supply" and avoid energy waste. For example, in an electronic assembly shop with intermittent production, no-load energy consumption can be reduced by more than 30%.
    • Internet of Things Monitoring System: Real-time monitoring of pressure, temperature, water quality and other parameters, automatic alarm and log recording when abnormal, support remote control, reduce manual inspection frequency by 40%.
  4. Environmental Compliance
    • the discharged water does not need to be treated and meets environmental protection requirements; the oil-free lubrication system reduces the generation of waste oil and reduces the cost of environmental compliance for enterprises. For example, after a pharmaceutical company adopts an oil-free water-lubricated air compressor, the annual waste oil treatment cost is reduced by about 150000 yuan.

3. Industry Application Cases

  1. food Industry
    • after a large flour mill adopted an oil-free water lubricated air compressor, the oil content of compressed air increased from 0.05 mg/m & sup3; Decreased to 0.003 mg/m & sup3;, flour ash content decreased by 0.2, product grade increased by one level, and annual income increased by more than 2 million yuan.
  2. Pharmaceutical industry
    • in the production of aseptic preparations, oil-free compressed air is used to drive the piston of the filling machine to avoid oil contamination of the liquid medicine, and the product qualification rate is increased from 92% to 99.5, meeting the GMP certification requirements.
  3. Electronic industry
    • A semiconductor enterprise provides a clean air source through an oil-free water lubrication air compressor. The chip yield rate is increased by 5%, the equipment failure rate due to oil pollution is reduced by 80%, and the annual maintenance cost is reduced by about 500000 yuan.

4. selection recommendations

  1. choose according to air quality needs
    • if the process requires the oil content of compressed air ≤ 0.01 mg/m & sup3;(such as food, medicine), the oil-free water lubrication air compressor is preferred;
    • if the air quality requirements are low (such as mechanical processing), the combination of oil injection screw air compressor + post-processing equipment can be considered.
  2. Matching gas characteristics of production line
    • continuous gas supply scenario: Select power frequency models to ensure stability;
    • intermittent Gas Scenario: Select the frequency conversion model and adjust the energy consumption as required.
  3. Focus on post-maintenance costs
    • although the initial investment is high, the maintenance cycle is long (e. g., the oil filter replacement cycle is extended from 2000 hours to more than 2000 hours), and the long-term comprehensive cost is lower.

Summary: The choice of plant air compressor needs to be process-oriented. For food, medicine, electronics and other industries demanding air cleanliness, air compressor without oil and water lubrication with its characteristics of zero oil pollution, high efficiency and energy saving, intelligent stability, etc., it has become the core equipment to ensure product quality and production safety, and at the same time help enterprises to achieve low-carbon and intelligent transformation.

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