On-site Nitrogen Generator System

For factories focused on continuous production, stable nitrogen supply has become a critical factor affecting safety, energy consumption, and delivery schedules. The on-site nitrogen generator system provided by Shenger Gas enables continuous production of industrial nitrogen directly at the user's facility, making the supply more controllable and allowing businesses to manage their gas sources more effectively while evaluating long-term operational costs.

Product Positioning and System Components

The on-site nitrogen generator system features a modular and skid-mounted design, allowing for the selection of single or multiple units in parallel based on project scale. A typical system consists of the following components:

1. Air Compression and Pre-treatment Unit: Includes compressors, refrigerated dryers, and precision filters to provide dry, clean compressed air.
2. PSA Adsorption Separation Unit: A dual-tower structure filled with carbon molecular sieves, using periodic pressurization and depressurization to separate oxygen and nitrogen.
3. Nitrogen Buffer and Pressure Stabilization Unit: Balances instantaneous gas consumption fluctuations and ensures stable pipeline pressure.
4. Automatic Control and Monitoring Unit: PLC + touchscreen architecture for real-time monitoring of purity, pressure, flow rate, and operational status, with provisions for remote communication interfaces.

The entire system operates at ambient temperature, eliminating the need for complex cryogenic equipment, allowing for quick installation and commissioning in standard factory buildings or containers.

Working Principle and Process Features

The system uses compressed air as the raw material, and through selective adsorption of oxygen, carbon dioxide, and moisture by carbon molecular sieves, nitrogen is enriched and output. Its core features include:

1. Ambient Temperature Separation: The gas separation process is completed at ambient temperature, eliminating the need for a liquefaction stage, resulting in a relatively simple equipment structure.
2. Cycle Switching: Two adsorption towers operate alternately. One tower adsorbs and produces nitrogen, while the other tower undergoes depressurization and regeneration, allowing the system to provide continuous gas supply.
3. Adjustable Purity: By adjusting the adsorption time, switching frequency, and nitrogen reflux ratio, the balance between nitrogen purity and flow rate can be adjusted within a certain range.
4. Controllable Dew Point: With front-end drying and rear-end pressure stabilization, the nitrogen dew point can be controlled between -40°C and -60°C, meeting the requirements of most industrial processes.

This process has been in long-term operation in industries such as steel, chemicals, and electronics. Its operational logic is clear, with daily maintenance focused on replacing filters and regularly checking valve groups and electrical components, making the workload predictable.

Performance Parameters and Technical Specifications Example

The following are common parameter ranges for small to medium-sized industrial systems. Actual calculations and selection should be based on the project conditions:

• Nitrogen Purity: 95% – 99.999% (configured according to process requirements)
• Nitrogen Flow Rate: 10 – 2,000 Nm³/h (larger flow rates can be achieved by parallel units)
• Outlet Pressure: 0.1 – 0.8 MPa (boosters can be added for higher pressure levels)
• Outlet Dew Point: -40°C – -60°C (standard configuration range)
• Ambient Temperature: 5 – 45°C (enhanced cooling solutions available for high-temperature areas)
• Inlet Temperature: ≤ 40°C (recommended to be paired with after-coolers and refrigerated dryers)
• Specific Energy Consumption Reference: Approximately 0.25 – 0.40 kWh/Nm³ (varies with purity and pressure requirements)

The technical parameter range for typical small to medium flow-rate on-site nitrogen generator systems can be comprehensively verified by considering "inlet conditions + target purity + annual operating hours," allowing for early evaluation of long-term operating costs during the selection phase.

Typical Industries and Application Scenarios

This system is suitable for factories that require medium to high-purity nitrogen and have relatively stable gas demand, including but not limited to:

• Food and beverage packaging: Nitrogen flushing for preservation and nitrogen blanketing for storage to slow oxidation.
• Electronics and semiconductor manufacturing: Shielding gas for soldering and inert atmospheres for production environments.
• Chemical and fine chemical industry: Nitrogen blanketing for reactors, pipeline purging, and storage tank protection.
• Metal heat treatment and surface treatment: Protective atmosphere during annealing and bright treatment processes.
• Lithium battery and new energy industry: Inert protection for electrode drying and powder conveying systems.
• Pharmaceuticals and laboratories: Inert atmospheres for certain process steps and storage environments.

These industries share common characteristics: long-term stable nitrogen consumption, high sensitivity to production downtime risks, and stringent requirements for safety management and regulatory compliance.

From upfront load calculations and pipeline pressure distribution to subsequent energy consumption assessment and maintenance strategies, we can provide practical engineering recommendations. For companies planning to introduce an on-site nitrogen generator system and wishing to calculate gas cost per unit of product or compare the payback period of different supply modes, we recommend communicating with us at the early project stage to find the right balance between safety, maintainability, and overall economics.

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