Producing 99.99% nitrogen on site requires more than selecting a nitrogen generator with sufficient nominal flow. Nitrogen purity, compressed-air consumption, inlet conditions, Carbon Molecular Sieve performance, pretreatment, and online purity monitoring all affect the final system design.
Lingyu’s PSA nitrogen generator uses two adsorption towers filled with Carbon Molecular Sieve (CMS). Oxygen is preferentially adsorbed from compressed air while nitrogen passes through the adsorption bed as product gas. The two vessels alternate automatically between adsorption and regeneration under PLC control to maintain continuous nitrogen production.
For users comparing different PSA purity configurations, Lingyu’s nitrogen generator range covers the broader product family.
How PSA Nitrogen Generation Works
Pressure Swing Adsorption separates nitrogen from compressed air through alternating adsorption and regeneration cycles.
Adsorption
Compressed air enters the active adsorption vessel and passes through a bed of Carbon Molecular Sieve.
The CMS preferentially adsorbs oxygen molecules, allowing nitrogen to pass through the bed and be collected as product gas.
Regeneration
At the same time, the second adsorption vessel is depressurized.
Oxygen previously adsorbed by the CMS is released and discharged to atmosphere with the assistance of a small amount of nitrogen purge gas.
Automatic Tower Switching
When the active adsorption tower reaches its predetermined adsorption capacity, the PLC changes the operating sequence.
The regenerated vessel begins adsorption while the first tower enters regeneration.
The two vessels continuously alternate between these operating states, allowing the system to maintain nitrogen production at the specified purity.
Why 99.99% Nitrogen Requires Purity-Specific Sizing
The broader PSA nitrogen-generator platform supports nitrogen purity from 95% to 99.999%, but purity and production capacity cannot be considered independently.
Higher nitrogen purity affects nitrogen recovery and the amount of compressed air required to produce a given volume of product gas.
A 99.99% PSA nitrogen generator should therefore be selected using the capacity and effective compressed-air consumption associated with the LYZD-E configuration rather than using the rated flow of a 99% or 99.5% model.
For this purity level, the key sizing relationship is:
99.99% nitrogen purity + required nitrogen flow + effective compressed-air demand
Standard PSA Operating Conditions
The PSA nitrogen-generation platform operates within the following standard conditions:
| Parameter | Specification |
|---|---|
| Inlet air temperature | ≤40°C |
| Inlet air pressure | 0.5–0.8 MPa |
| Available PSA nitrogen purity | 95%–99.999% |
| Nitrogen dew point | ≤−40°C |
| Ambient temperature | ≤40°C |
| Switching cycle | 45–60 s |
| Power supply | 220 V / 50 Hz |
| Noise level | ≤75 dB |
These are series-level operating conditions. The capacity and compressed-air consumption discussed below are specific to the 99.99% LYZD-E configuration.
LYZD-E 99.99% Nitrogen Generator Technical Parameters
Representative LYZD-E specifications are shown below.
| Model | Nitrogen Production | Inlet Pipe | Outlet Pipe | Dimensions H × L × W | Effective Air Consumption |
|---|---|---|---|---|---|
| LYZD-E5 | 5 m³/h | DN15 | DN15 | 1936 × 1000 × 600 mm | 0.43 m³/min |
| LYZD-E10 | 10 m³/h | DN20 | DN15 | 2205 × 1050 × 650 mm | 0.86 m³/min |
| LYZD-E20 | 20 m³/h | DN25 | DN25 | 2150 × 1250 × 550 mm | 1.73 m³/min |
| LYZD-E50 | 50 m³/h | DN40 | DN25 | 2718 × 1750 × 765 mm | 4.33 m³/min |
| LYZD-E120 | 120 m³/h | DN50 | DN40 | 3160 × 2350 × 1200 mm | 10.40 m³/min |
| LYZD-E200 | 200 m³/h | DN80 | DN40 | 3232 × 2800 × 1450 mm | 17.33 m³/min |
The 10.40 m³/min effective air-consumption value belongs to the LYZD-E120 at 120 m³/h. A 100 m³/h model should not be inserted between the listed 90 and 120 m³/h configurations.
The complete LYZD-E range also includes 15, 25, 30, 35, 40, 60, 70, 90, 130, 150, 170, and 180 m³/h configurations. The table above is therefore a representative selection rather than the complete model range.
Effective Air Consumption at 99.99% Purity
Compressed-air consumption is a primary sizing parameter for a high-purity PSA nitrogen system.
Representative relationships include:
| Nitrogen Production | Effective Air Consumption |
|---|---|
| 5 m³/h | 0.43 m³/min |
| 20 m³/h | 1.73 m³/min |
| 50 m³/h | 4.33 m³/min |
| 120 m³/h | 10.40 m³/min |
| 200 m³/h | 17.33 m³/min |
The upstream compressor cannot be sized according to product nitrogen flow alone.
Available compressed-air capacity must cover the effective air demand of the nitrogen generator together with other compressed-air consumers operating in the plant.
Design Conditions for Rated Performance
LYZD-E capacity and effective air-consumption values are based on defined design conditions:
Adsorption pressure: 0.8 MPa(g)
Ambient temperature: 20°C
Feed-air relative humidity: 80%
Actual nitrogen capacity and compressed-air consumption can vary when inlet pressure, temperature, humidity, compressed-air quality, or other operating conditions differ from these design conditions.
This is particularly important for a 99.99% system because purity, nitrogen recovery, and available product flow are closely related.
Automatic PLC Operation
The PSA generator provides fully automatic operation, including automatic start and stop and automatic cycle switching.
Pneumatic valves are managed by PLC control to coordinate adsorption, pressure equalization, depressurization, and regeneration.
Automatic Tower Sequencing
During continuous production, one vessel remains in adsorption while the other completes regeneration.
The control system automatically changes the flow path at the required point in the cycle, eliminating routine manual switching between adsorption vessels.
Switching Cycle
The standard switching cycle is:
45–60 seconds
Correct sequencing helps maintain continuous nitrogen production while allowing each CMS bed to alternate between adsorption and regeneration.
Real-Time Purity and Flow Monitoring
Nitrogen purity and flow rate are continuously monitored online in real time.
At 99.99% purity, continuous monitoring becomes especially important because relatively small changes in gas composition can determine whether product nitrogen remains within the specified requirement.
The digital touchscreen displays key operating information including:
- Pressure
- Nitrogen purity
- Nitrogen flow rate
- System operating status
This gives operators direct visibility into both product-gas quality and PSA operating conditions.
Off-Spec Nitrogen Alarm and Protection
The PSA nitrogen generator includes off-spec nitrogen protection.
If nitrogen purity falls below the specified value, the system activates an alarm.
If the off-spec condition continues for a preset period, the generator automatically shuts down for protection.
This function is particularly relevant where lower-purity nitrogen could affect production quality, product performance, or downstream process equipment.
Automatic CMS Compaction
The PSA system includes an automatic Carbon Molecular Sieve compaction device.
Its purpose is to maintain the required CMS packing density and help reduce pulverization caused by movement within the adsorption bed.
Stable CMS packing is important to adsorption performance, especially where the nitrogen system must maintain 99.99% purity.
CMS condition should be evaluated according to purity performance, flow stability, pressure behavior, operating history, and equipment inspection rather than a universal fixed replacement interval.
Pressure Equalization and Nitrogen Recovery
The PSA design uses an optimized unequal-pressure equalization process.
This operating strategy improves nitrogen recovery efficiency and can indirectly reduce overall energy consumption by approximately 5% under the corresponding comparison conditions.
Actual energy performance depends on compressor efficiency, inlet pressure, required nitrogen purity, nitrogen flow, load profile, and operating schedule. The approximately 5% figure should therefore not be treated as a fixed reduction in total plant energy use.
Compressed-Air Pretreatment for High-Purity PSA
CMS performance depends heavily on the quality of compressed air entering the adsorption vessels.
Oil contamination, liquid water, and excessive particulate loading can adversely affect adsorption performance and long-term CMS condition.
A complete nitrogen-generation system can include compressed-air storage, drying, and multiple filtration stages upstream of the PSA generator.
Where additional contamination control is required, Lingyu’s precision compressed air filters can be integrated into the pretreatment system.
The appropriate filter arrangement should be selected according to compressor type, compressed-air contamination, and the required inlet-air quality for the nitrogen generator.
Nitrogen Dew Point and Purity Are Separate Specifications
The standard PSA nitrogen dew point is:
≤−40°C
Nitrogen purity defines gas composition, while dew point describes moisture content. These are separate performance specifications.
A process requiring dry high-purity nitrogen may therefore need both:
99.99% nitrogen purity
and
a defined nitrogen dew point
The required moisture specification should be confirmed together with nitrogen purity when selecting the complete system.
Is 99.99% Nitrogen Required for Every Application?
Industries such as electronics, food processing, pharmaceuticals, laboratories, laser processing, oil and gas, and beverage manufacturing can all use nitrogen, but their purity requirements vary according to the individual process.
A 99.99% generator should only be selected where the process specification requires or permits this purity level.
For example, general nitrogen blanketing and highly oxygen-sensitive semiconductor production can have very different residual-oxygen requirements.
For a relevant high-purity manufacturing context, users can review Lingyu’s semiconductor and PCB manufacturing application.
Nitrogen purity should therefore be specified according to the process rather than assigned universally to an entire industry.
Nitrogen Buffering and Delivery
A complete PSA nitrogen system normally incorporates downstream buffering and distribution.
The nitrogen buffer should be considered together with generator capacity, instantaneous nitrogen consumption, required delivery pressure, pipeline pressure loss, process cycling, and acceptable pressure fluctuation.
Role of the Nitrogen Buffer
Buffer storage can help stabilize nitrogen delivery when downstream demand changes more quickly than the PSA production cycle.
The buffer does not increase nitrogen purity or the rated capacity of the generator.
Its purpose is to help balance production and consumption while supporting stable delivery conditions.
How Purity Affects Available Nitrogen Capacity
Nitrogen purity and production capacity should not be treated independently.
As the required PSA nitrogen purity becomes more demanding, a smaller proportion of the feed air can normally be recovered as usable product nitrogen under the same general operating conditions.
This is why the 99%, 99.5%, and 99.99% configurations use different capacity and effective air-consumption data.
A lower-purity model should not be selected with the assumption that its rated output remains unchanged when the purity requirement is increased to 99.99%.
99.99% PSA Nitrogen vs. ≥99.999% Purified Nitrogen
A 99.99% LYZD-E PSA nitrogen generator is technically different from a downstream purification system designed to produce nitrogen at ≥99.999% purity.
A Carbon-Based Deoxygenation Purification System can use PSA-produced nitrogen at approximately 99.9% purity as feed gas and further purify it.
Carbon-Based Deoxygenation Process
The purification process uses a Type 3093 deoxygenation agent.
Residual oxygen reacts during the deoxygenation stage to form CO₂. The system then removes CO₂ and moisture before final filtration.
This is a separate gas-treatment process rather than simply a higher-purity setting on the LYZD-E generator.
Separate High-Purity System Specifications
The downstream purification configuration has separate operating parameters, including:
| Parameter | Specification |
|---|---|
| Nitrogen capacity | 10–800 m³/h |
| Oxygen | ≤10 ppm |
| CO₂ | ≤5 ppm |
| Nitrogen purity | ≥99.999% |
| Atmospheric dew point | ≤−60°C |
| Power supply | 380 V / 50 Hz |
Higher-purity applications should therefore be evaluated as a separate customized PSA or downstream purification configuration rather than assuming that the same 99.99% LYZD-E unit can simply be adjusted to ≥99.999%.
How to Select a 99.99% PSA Nitrogen Generator
A 99.99% nitrogen system should be selected according to the complete operating profile rather than nominal nitrogen flow alone.
Required Nitrogen Purity
Confirm that 99.99% nitrogen is the actual process requirement.
If ≥99.999% nitrogen is required, evaluate the appropriate higher-purity PSA or downstream purification system separately.
Required Nitrogen Flow
Determine normal, peak, and future nitrogen demand.
The representative LYZD-E table covers capacities from 5 to 200 m³/h, with additional intermediate models available.
Available Compressed-Air Capacity
Verify that the compressor system can provide the required effective airflow.
Representative air-consumption requirements range from 0.43 m³/min for 5 m³/h nitrogen production to 17.33 m³/min for 200 m³/h.
Compressed-Air Pressure
The standard inlet-air pressure range is:
0.5–0.8 MPa
Model performance data are based on an adsorption pressure of:
0.8 MPa(g)
Inlet and Ambient Conditions
The standard inlet-air temperature is ≤40°C, and the standard ambient temperature limit is also ≤40°C.
Actual humidity, ambient conditions, and inlet-air quality should also be considered.
Nitrogen Dew Point
The standard nitrogen dew point is:
≤−40°C
Confirm that this moisture level satisfies the downstream process specification.
Pretreatment
Define the compressed-air drying and filtration required to protect the CMS beds from liquid moisture, oil contamination, and excessive particles.
Buffer and Distribution
Evaluate nitrogen buffer capacity, delivery pressure, pipeline pressure loss, instantaneous demand, and process operating pattern.
Purity Monitoring and Controls
Confirm requirements for PLC automation, real-time nitrogen purity monitoring, nitrogen-flow monitoring, touchscreen display, off-spec alarms, and protective shutdown.
Users selecting this purity level can review Lingyu’s 99.99% PSA nitrogen generator.
For special capacities, purity requirements, or system-integration conditions, the final equipment configuration should be matched to the actual project requirements.
Conclusion
The LYZD-E PSA nitrogen generator is designed around 99.99% nitrogen production, purity-specific capacity, effective compressed-air consumption, CMS protection, and online purity control.
The PSA process uses two CMS-filled adsorption vessels that alternate automatically between adsorption and regeneration. Oxygen is preferentially adsorbed, nitrogen passes through as product gas, and PLC-controlled switching maintains continuous production.
Standard PSA operating conditions include 0.5–0.8 MPa inlet pressure, ≤40°C inlet temperature, ≤−40°C nitrogen dew point, a 45–60 second switching cycle, 220 V / 50 Hz power supply, and ≤75 dB noise level.
Representative LYZD-E capacity extends from 5 m³/h at 0.43 m³/min effective compressed-air consumption to 200 m³/h at 17.33 m³/min, with additional intermediate models available.
For requirements above the LYZD-E purity level, ≥99.999% nitrogen should be treated as a separate technical configuration. Carbon-based deoxygenation purification, for example, uses a different process and has separate capacity, residual oxygen, CO₂, dew-point, and electrical specifications.
