Industrial VPSA Oxygen Generator

An industrial VPSA oxygen generator is designed for medium to large industrial oxygen demands where liquid tanks or cryogenic plants are either too expensive or operationally inflexible.

Unlike PSA units that operate only under positive pressure, the VPSA process employs a vacuum regeneration step for the zeolite molecular sieve. This significantly reduces energy consumption when the required oxygen purity is between 90% and 95%.

Shenger Gas builds these units for continuous or intermittent operation, typically in the range of 50 – 5,000 Nm³/h.
The system runs at near-ambient temperature - no combustion, no high-pressure oxygen storage - requiring only power and a compressed air feed.

 

Working Principle

The core consists of two or more adsorber vessels filled with lithium or sodium zeolite.
The cycle has two main phases:

• Adsorption – Conditioned compressed air enters the vessel. Nitrogen, CO₂, and residual water vapor are adsorbed by the zeolite. Oxygen passes through as the product gas into a buffer tank.
• Desorption (Regeneration) – Once saturated, a vacuum pump lowers the vessel pressure to near-vacuum (not "near negative"). The trapped nitrogen is released from the zeolite and vented to atmosphere.

Two vessels alternate between adsorption and regeneration, controlled by timed valves.
The result is a continuous oxygen flow without chemical reactions or byproducts requiring treatment.

 

Key Performance Table (Typical Ranges)

Parameter	Range / Typical Value	Notes
Oxygen purity	90% – 95%	Adjustable, not for 99%+
Flow rate	50 – 5,000 Nm³/h	Model-dependent
Inlet air temp	5°C – 45°C	Precooling required if higher
Ambient temp	-10°C – 50°C	Low-temp version available
Power consumption	0.32 – 0.45 kWh/Nm³ O₂	At 93% purity
Start-up time	≤ 30 min to rated purity	Faster from hot standby
Maintenance per year	2 – 4 times	Zeolite life ≥ 8 years

The numbers above are for reference. Final values depend on site conditions.

 

Power Consumption – What Engineers Actually Check

Many buyers ask for "total installed power", but the real metric is kWh per Nm³ of oxygen.
A properly sized industrial VPSA oxygen generator at 93% purity and near-atmospheric discharge should operate around 0.35 kWh/Nm³ or lower.
Shenger Gas provides a site-corrected consumption table (altitude, humidity, inlet temperature) - not a lab-only number.

Another less obvious but important factor is start-stop loss. Frequent pressure cycling ages the zeolite faster.
Our units use optimized valve sequencing and pressure equalization steps, cutting real-world energy use by roughly 8–12% compared to older designs.

 

Technical Parameters (Selection Reference)

Model: SER-VPSA-300

• Oxygen flow: 300 Nm³/h @ 93%
• Delivery pressure: 0.3 – 0.5 bar(g)
• Installed power: ~110 kW (vacuum pump + blower + controls)
• Cooling: water-cooled or air-cooled
• Control: PLC auto, remote start/stop & data logging
• Noise: ≤82 dB(A) at 1 meter

Model: SER-VPSA-1000

• Oxygen flow: 1,000 Nm³/h @ 93%
• Delivery pressure: 0.3 – 0.6 bar(g)
• Installed power: ~350 kW
• Footprint: ~45 m² (auxiliary room excluded)
• Vessel material: carbon steel with internal coating or 304 stainless steel liner

Different purity or pressure levels require recalculation of both flow and power.

 

Industrial Applications

We do not list fake customer cases. An industrial VPSA oxygen generator is technically suitable for:

• Steelmaking – blast furnace enrichment, EAF combustion support
• Non-ferrous metals – copper, lead, zinc smelting with oxygen enrichment
• Chemical & pulp – oxidation reactions, black liquor recovery
• Glass & ceramics – oxygen-fuel combustion to lower NOx
• Wastewater treatment – aeration enhancement for biological stages

 

Certifications & Project Delivery

Design references (not limited to one standard):

• ASME / GB150 pressure vessels
• ISO 9001 quality management
• CE (optional)
• ATEX (optional per contract)

What is delivered:

• Adsorbers, buffer tank, process piping and valves
• Vacuum pump / blower skid (brand specified by client or standard selection)
• PLC panel with HMI
• On-site commissioning supervision
• Operation & maintenance manual (English/Chinese)

Typical lead time: 90–120 days, depending on configuration and current shop load.

 

Customization – From Engineering Logic, Not a Checklist

Most vendors start with: "What purity do you need?"

Shenger Gas starts with these questions:

• Is your oxygen demand 24/7 or intermittent?
• What pressure fluctuation can your process tolerate?
• Is cooling water or instrument air available on site?
• Do you plan to expand production later?

Based on the answers, we customize:

• Zeolite type and filling quantity
• Vacuum pump and blower margin
• Control strategy (constant purity vs. constant flow)
• Whether to reserve extra vessel connections for future flow increase

This logic-driven customization fits real production far better than changing a few dimensions.

 

Service & Engineering Support

For every industrial VPSA oxygen generator, Shenger Gas follows a three-stage service structure:

1. Pre-sale process design – mass balance, energy comparison, total cost of ownership (TCO) estimate
2. Installation & commissioning – field engineer support for 7–10 workdays, including operator training
3. Long-term maintenance – zeolite activity check, seal replacement guidance, remote PLC diagnosis

We do not promise "zero failures". We promise:

• Technical response within 48 hours (domestic)
• Traceable supply of key spares (valve seals, sensors) for 3–5 years

 

In the oxygen generation field, very few suppliers openly discuss the less beautiful numbers - zeolite aging, vacuum pump maintenance, or how inlet temperature affects real output.
Shenger Gas does not hide these. We put them in the technical deviation sheet before you sign anything, so you receive a credible, actionable proposal - not a sales pitch.

If you are evaluating on-site oxygen generation, start with a site-specific calculation sheet. It tells you more than a hundred polished case studies ever will.

 

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