Nitrogen Generators

CNG Modular Nitrogen Generator Series

The CNG Modular Nitrogen Generator Series uses Pressure Swing Adsorption (PSA) technology to produce nitrogen gas on-site from compressed air.

Main Specifications

Nitrogen flow: 0.5–1000 Nm³/h
Nitrogen purity: 95–99.999%
Nitrogen pressure: 0.1–0.8 MPa (Adjustable)
Atmospheric dew point: -40°C to -70°C

How PSA Nitrogen Generation Works

The CNG series uses Pressure Swing Adsorption technology to separate nitrogen from compressed air.

The Process

• Carbon Molecular Sieve: Made from processed coal powder containing tiny pores that selectively adsorb gas molecules.
• Separation Process: Compressed air flows through a two-bed system. Larger oxygen molecules are absorbed into the carbon molecular sieve, while smaller nitrogen molecules pass through and are collected.
• Adsorption Phase: One tower produces nitrogen while oxygen is captured in the carbon molecular sieve.
• Regeneration Phase: The second tower releases captured oxygen by reducing pressure, then switches to production mode.

The two towers alternate between these phases automatically, providing continuous nitrogen production.

Key Features

• Fast Production: Quickly generates nitrogen with consistent purity
• Energy Efficient: Operates at room temperature and standard pressure (0.8 MPa) without heating. Air-to-nitrogen ratio of 4.2:1 at 99.99% purity compared to 5:1 for traditional twin-tower generators, saving up to 15% on energy consumption.
• User-Friendly: Simple operation with low maintenance needs
• Automated Process: Fully automated for continuous nitrogen production

CNG Series Components (Standard Equipment)

The CNG Modular Nitrogen Generator includes comprehensive components as standard:

Air Treatment

• Feed Air Filters: Removes dust, oil, and moisture from compressed air
• Flow Control Valve: Regulates nitrogen flow and maintains pressure
• SMC Flow Meter: Ensures accurate measurement of nitrogen flow
• Inlet Dew Point Monitor: Monitors moisture levels for optimal nitrogen production

Control Systems

• PLC Controller: Siemens PLC with high-resolution interface for precise monitoring and control
• Nitrogen Purity Analyser: Guarantees consistent quality of nitrogen produced
• Pressure Sensors: Monitor system pressure for safety and reliability

PSA Components

• PSA Angle Valves: Enable effective control of gas flow
• Pneumatic Actuators: Original Taiwan AirTAC components ensure stable operation
• Carbon Molecular Sieve: High-quality CMS from international sources

Construction Features

• Aluminium Alloy Cavity: High-strength, non-corrosive 6063-T5 aviation grade aluminium alloy for long service life
• Easy-Replace Mold Core: Designed for quick on-site adsorbent changes
• Two-Stage O-Ring Seal: Exceptional sealing effect
• Patented Diverter Diffuser: Ensures uniform passage of compressed air
• Built-in Process Tank: Some models (N-suffix) include built-in nitrogen process tank

CNG Series Advantages

High Efficiency

Achieves energy savings with a low air-to-nitrogen ratio of 4.2:1 for 99.99% purity, compared to 5:1 for traditional twin-tower generators, saving up to 15% on energy consumption.

Smart Control

PLC programmable control system with high-resolution interface monitors air pressure, nitrogen purity, and flow. Automatic functions include removing unqualified nitrogen and energy-saving pauses.

Reliable Operation

Features a control method combining solenoid and pneumatic valves for stable and reliable performance.

Durable Design

Built from high-strength, non-corrosive aluminium alloy, preventing corrosion and extending equipment life. Some models include built-in nitrogen process tank, optimising installation space.

Continuous Supply

Provides constant nitrogen supply 24/7. Modular design allows easy expansion—simply add modules to increase capacity without replacing existing equipment.

CNG Model Range

Available Models (@ 99.5% Purity)

Note: Models with suffix “N” (CNG-5N, CNG-15N, CNG-20N) include built-in nitrogen process tank. Models without suffix do not include standard built-in tank.

Air Dryer Configurations

With Refrigerated Dryer:

• Air compressor flow rate increases by 10%
• Achieves nitrogen dew point below -30°C

With Refrigerated + Desiccant Dryer:

• Air compressor flow rate increases by 20%
• Achieves nitrogen dew point below -40°C

Nitrogen Applications

Nitrogen is widely used across various industries:

• Food Preservation: Modified atmosphere packaging, nitrogen flushing, tank blanketing
• Winemaking: Tank headspace protection, bottling line inerting, oxidation prevention
• Laser Cutting: Assist gas for laser cutting operations
• Chemical Manufacturing: Reaction vessel inerting, pipeline purging, tank blanketing
• Electronics: Soldering atmospheres, component storage
• Pharmaceuticals: Inert atmosphere manufacturing, packaging, storage

Compressed Air Requirements

The CNG Modular Nitrogen Generator requires compressed air supply:

Air Inlet Pressure: 0.6 to 0.8 MPa

Air Quality: Clean, dry compressed air (free from oil and moisture)

Connection Sizes: G1/2, G3/4, or G1 depending on model

If you already have an air compressor producing clean, dry air at the required pressure, it may be suitable for nitrogen generation. Compressor Systems can assess your existing compressed air system and recommend appropriate solutions.

Installation Considerations

Space Requirements

Compact Footprint:

• Models CNG-5N to CNG-60: 400mm width
• Models CNG-70 to CNG-120: 830mm width
• All models: 1750mm height

Site Requirements

• Adequate ventilation
• Level foundation to support equipment weight (180-1200 kg)
• Access to compressed air supply
• Electrical power for control systems
• Protection from weather (if installed outdoors)

Warranty

Standard Warranty: 2-year warranty covers the complete nitrogen generator (terms and conditions apply)

Common Nitrogen Generator Questions

Why Consider On-Site Nitrogen Generation?

Compared to Bottled Nitrogen

• Supply Independence: Generate nitrogen as needed, 24/7, without relying on deliveries
• Space Efficiency: Eliminate storage space for nitrogen cylinders
• Purity Control: Adjust purity from 95% to 99.999% to match your application needs
• Pressure Control: Adjustable output pressure from 0.1 to 0.8 MPa
• Continuous Availability: No production interruptions due to empty cylinders or delivery delays
• Safety: Lower pressure operation (0.1-0.8 MPa) compared to high-pressure cylinders

Industries We Serve

Compressor Systems supplies nitrogen generation solutions to various Australian industries:

• Mining & Resources: Nitrogen for inerting, blanketing, and fire prevention
• Food & Beverage: Modified atmosphere packaging, product preservation, tank blanketing
• Pharmaceutical: Manufacturing atmospheres, packaging, storage applications
• Manufacturing: Laser cutting, welding, heat treating, 3D printing
• Wine Production: Tank blanketing, bottling operations, oxidation prevention
• Chemical Processing: Reaction vessels, pipeline purging, tank inerting
• Electronics: Soldering, component storage, manufacturing atmospheres

Nitrogen Facts

Appearance: Nitrogen is a colorless and odorless gas

Atmospheric Presence: Constitutes about 78.08% of Earth’s atmosphere and is lighter than air

States of Matter:

• Liquid at -195.8°C
• Solid at -209.8°C (resembles snow)

Chemical Properties: Generally unreactive at room temperature, making it useful for preserving food, extending shelf life, and preventing spoilage

Reactivity: Under high temperatures and energy conditions, nitrogen can react with certain substances