LDH GAS SYSTEMS COMPANY LIMITED is a professional high-tech enterprise specializing in the research, design, and production of gas equipment, cryogenic systems, and comprehensive environmental simulation equipment. Our service tenet is simple: solve customer problems with superior products and earn customer satisfaction with exceptional quality.
With a strong focus on technological innovation, we have established ourselves as a leader in the field. Our credibility is built on:
✓ Expertise & R&D: We maintain long-term, close cooperation with the Chinese Academy of Sciences, combining professional R&D with extensive practical engineering experience.
✓ Global Certifications: Our products and quality management systems are certified to international standards, including EU CE and ISO9001, ensuring they meet the stringent requirements of global markets.
✓ International Presence: LDH products are trusted by industries not only across China but also in countries worldwide, including Peru, Austria, India, Pakistan, the Philippines, and Kazakhstan,etc..
Why Choose On-Site Nitrogen Generation?
Switching from traditional nitrogen supplies (cylinders or bulk liquid) to an on site generator is a strategic investment. B2B buyers globally are making the switch to gain a competitive edge. Market trends show a surge demand for on-site generation to reduce dependency and ensure an uninterrupted supply.
Significant Cost Savings
Eliminate recurring costs of gas rental, delivery, and handling. On-site
generation can reduce nitrogen costs by 40-80%, with a typical ROI of just 6-18
months. |
Total Supply Control
Produce nitrogen 24/7, on-demand,at the exact purity and flow rate your
application requires. End your reliance on third-party suppliers and avoid
production downtime due to delivery delays. |
Enhanced Safety & Sustainability
Remove the workplace hazards associated with handling high-pressure
cylinders or cryogenic liquids. Reduce your carbon footprint by eliminating
transportation-related emissions. |
Our Flagship Product: LPN Series PSA Nitrogen Generators
The Power of Pressure Swing Adsorption (PSA)
Our LPN series generators utilize advanced Pressure Swing Adsorption (PSA) technology. This process separates nitrogen from compressed air with exceptional efficiency. Air is passed through a vessel containing a Carbon Molecular Sieve (CMS).
The CMS has a unique property: it preferentially adsorbs oxygen, carbon dioxide, and moisture, while allowing high-purity nitrogen to pass through. As industry experts note, PSA technology is ideal for applications requiring high purity levels, often up to 99.999%.
Key Technological Advantages
. High & Stable Purity: Proprietary purity control technology delivers consistent, high-purity nitrogen tailored to your needs.
. Rapid Start-Up: Achieve qualified nitrogen output in as little as 10-20 minutes.
. Energy Efficiency: We use high-performance molecular sieves and unique PSA energy-saving techniques to lower your operational costs.
· Intelligent Monitoring: Optional L-TECH remote monitoring system allows for full control of operating conditions, real-time data access, and remote system upgrades.
. Durability: Standard molecular sieve protection and alarm systems ensure long, stable, and reliable equipment life.
A Solution for Every Need
Integrated Nitrogen Generators
A compact, all-in-one solution.
Features a modular design for high expandability and flexible customization.
Ideal for professional applications requiring stable flow and long-life performance.
Split-Type Nitrogen Generators
Offers independent integration with multiple protection layers.
Designed for easy mobility, simple maintenance, and quiet, eco-friendly operation.
Smart, user-friendly, and easily upgradable.
Containerized Nitrogen Generators
A true plug-and-play system for outdoor use.
Dust & moisture resistant, soundproofed, and highly durable for industrial environments.
Containerized solution offer maximum adaptablity and reliablity.
Product Parameters
We offer a wide range of models to meet diverse capacity and purity requirements. Custom non-standard products are also available to perfectly match your specifications.
| Capacity |
Purity
% |
Model |
length
(mm) |
Width
(mm) |
Height
(mm) |
Weight
(kg) |
Inlet size
(DN) |
Outlet size
(DN) |
| 5 |
99 |
LPN-5H |
1000 |
1000 |
1640 |
380 |
DN15 |
DN15 |
| 99.9 |
LPN-5I |
1000 |
1000 |
1640 |
380 |
DN15 |
DN15 |
| 99.99 |
LPN-5J |
1300 |
1100 |
1400 |
560 |
DN15 |
DN15 |
| 99.999 |
LPN-5K |
1300 |
1100 |
1400 |
560 |
DN15 |
DN15 |
| 20 |
99 |
LPN-20H |
1450 |
1300 |
1450 |
700 |
DN20 |
DN15 |
| 99.9 |
LPN-20I |
1500 |
1400 |
2030 |
900 |
DN25 |
DN20 |
| 99.99 |
LPN-20J |
1500 |
1500 |
1700 |
1000 |
DN25 |
DN15 |
| 99.999 |
LPN-20K |
1600 |
1450 |
1950 |
1400 |
DN25 |
DN15 |
| 50 |
99 |
LPN-50H |
1600 |
1400 |
2100 |
1100 |
DN25 |
DN20 |
| 99.9 |
LPN-50I |
1700 |
1500 |
2100 |
1300 |
DN25 |
DN15 |
| 99.99 |
LPN-50J |
1700 |
1550 |
2160 |
1500 |
DN40 |
DN25 |
| 99.999 |
LPN-50K |
2000 |
1800 |
2500 |
2300 |
DN40 |
DN40 |
| 100 |
99 |
LPN-100H |
1600 |
900 |
2230 |
1050 |
DN40 |
DN50 |
| 99.9 |
LPN-1001 |
1800 |
1750 |
2250 |
1400 |
DN40 |
DN25 |
| 99.99 |
LPN-100J |
2100 |
1950 |
2250 |
2700 |
DN40 |
DN40 |
| 99.999 |
LPN-100K |
2200 |
1300 |
2900 |
3300 |
DN65 |
DN40 |
| 150 |
99 |
LPN-150H |
1800 |
1150 |
2200 |
1400 |
DN40 |
DN25 |
| 99.9 |
LPN-1501 |
2100 |
1200 |
2250 |
2200 |
DN40 |
DN40 |
| 99.99 |
LPN-150J |
2200 |
1300 |
2700 |
3200 |
DN50 |
DN40 |
| 99.999 |
LPN-150K |
2200 |
1500 |
3100 |
4400 |
DN80 |
DN50 |
| 200 |
99 |
LPN-200H |
2000 |
1150 |
2300 |
1700 |
DN40 |
DN25 |
| 99.9 |
LPN-200I |
2100 |
1200 |
2500 |
2200 |
DN40 |
DN50 |
| 99.99 |
LPN-200J |
2200 |
1400 |
2850 |
4100 |
DN65 |
DN50 |
| 99.999 |
LPN-200K |
2200 |
1500 |
3000 |
4100 |
DN65 |
DN50 |
| 300 |
99 |
LPN-300H |
2200 |
1250 |
2620 |
2500 |
50 |
40 |
| 99.9 |
LPN-300I |
2100 |
1200 |
2500 |
2240 |
50 |
40 |
| 99.99 |
LPN-300J |
2200 |
1500 |
3400 |
4200 |
80 |
50 |
| 99.999 |
LPN-300K |
2200 |
1500 |
3400 |
4260 |
80 |
80 |
| 400 |
99 |
LPN-400H |
2200 |
1300 |
2900 |
3350 |
65 |
40 |
| 99.9 |
LPN-400I |
2200 |
1500 |
3050 |
4200 |
65 |
50 |
| 99.99 |
LPN-400J |
2200 |
1500 |
3400 |
4300 |
80 |
80 |
| 500 |
99 |
LPN-500H |
2200 |
1400 |
2850 |
4100 |
65 |
50 |
| 99.9 |
LPN-500I |
2200 |
1500 |
3400 |
4200 |
80 |
50 |
| 99.99 |
LPN-500J |
2200 |
1500 |
3400 |
4200 |
80 |
80 |
| 800 |
99 |
LPN-800H |
2200 |
1500 |
3400 |
4300 |
80 |
80 |
| 99.9 |
LPN-800I |
2200 |
1500 |
3400 |
4200 |
80 |
80 |
| 1200 |
99 |
LPN-1200H |
2200 |
1500 |
3400 |
4300 |
80 |
80 |
Product Applications
As a mature engineering technology, PSA nitrogen generation technology is widely applied in industries such as chemical, metallurgical, food, and others for inert gas applications including protection, displacement, and pressurization.
I. Applications in the Steel Industry
The system is extensively used as a protective gas in processes such as furnace roof sealing, blast furnace ironmaking coal powder injection, continuous casting, steel annealing, stress relief, aging, hardening, carburizing, nitriding, nitrocarburizing, vacuum quenching, nitrogen-based atmosphere processes, welding, and powder metallurgical sintering. It also supports gas cleaning and dilution. Scientific nitrogen-based inert protection processes have proven to be an essential component in the heat treatment industry.
Technical Parameters and Features
- Nitrogen production capacity: 0.5-3000 Nm³/h
- Nitrogen purity: 99.5%-99.9999% (oxygen-free content)
- Nitrogen dew point: -45°C
High-purity nitrogen with a purity of up to 99.9999% is directly produced from compressed air.
- Reliable operation with unattended capability;
- Wider dew point range: -45°C to -70°C;
- Energy-efficient system with on-demand production;
- Multi-functional monitoring system featuring online display of operating parameters (e.g., flow rate, purity, pressure), equipment fault alarms, and automatic maintenance reminders;
- Integrated skid-mounted design for easy installation;
- The system undergoes pre-factory testing and commissioning;
- Optional photoelectric dew point meter for comprehensive nitrogen performance monitoring.
II. Industry Applications of PSA Nitrogen Generation Technology
1. Chemical Industry
In chemical production, nitrogen is widely used for safety assurance, including nitrogen blanketing to prevent risks from flammable, explosive, toxic, or harmful gases, system purging, emergency protection for hydrogenation reactors, and inert protection for chemical intermediate production-effectively reducing explosion risks and improving safety coefficients.
In sugar alcohol production, specific applications include: supplying gas for pneumatic valves of hydrogenation units, purging equipment (e.g., hydrogen compressors, tightness test systems, and maintenance zones), nitrogen blanketing for hydrogen compressors, emergency nitrogen charging for containers, and nitrogen preservation of finished sugar tanks (anti-bacterial contamination and anti-crystallization). For large-scale facilities (e.g., 60,000 t/year sugar alcohol plants), on-site nitrogen generation replaces costly external purchases (e.g., ~30,000 Nm³/day for startup), significantly reducing costs while enhancing system safety and valve stability.
2. Food Preservation Industry
In the food cold chain, nitrogen generators are applied to fresh-keeping of fruits, vegetables, and meat. By maintaining nitrogen environments in warehouses or via direct nitrogen injection, they extend food shelf life and freshness periods without altering taste. The equipment offers convenience and portability, with nitrogen purity reaching 99.999%.
3. Electronics Industry
With the global shift to lead-free electronics manufacturing, nitrogen protection has become critical in lead-free soldering processes (reflow soldering, wave soldering, and chip-level rework). It prevents oxidation of PCB pads and component leads, improves solder wetting, and enhances solder joint brightness- especially important as higher lead-free soldering temperatures (217-221°C, up to 260°C) accelerate oxidation. Nitrogen also expands process windows, supports multi-layer welding (e.g., OSP-coated double-sided boards), and increases solder surface tension for fine-pitch components.
4. Beer Preservation
Nitrogen safeguards beer quality by: inhibiting oxidation, removing off-volatile compounds (e.g., ethyl and sulfides) to improve taste, accelerating maturation, and shortening fermentation cycles. It is used for purging air from pipes/tanks during filtration, pre-pressurizing packaging systems (to minimize oxygen dissolution), and maintaining flavor stability and non-biological stability. Practical purity requirements are 99.5% (vs. theoretical 99.95%).
After Sales Service
Comprehensive Quality & Remote Service
Our commitment to quality is unwavering, from design to delivery. Every unit undergoes a strict quality inspection process to ensure flawless performance. We leverage technology to provide unparalleled support to our global customers.
. Remote IoT Monitoring: Our L-TECH system allows you to monitor equipment performance in real-time from anywhere in the world. This enables predictive maintenance and immediate diagnostics.
. Pre-Sales Consultation: Our engineers work with you to design a professional solution tailored to your specific needs.
. Online Remote Guidance: We provide comprehensive online guidance for installation, commissioning, and operational training to ensure your team is fully proficient.
FAQ
1. Why are nitrogen generators not available for immediate stock?
Nitrogen generators incorporate pressure vessels, which require official registration for use. Stocked equipment would have been stored for an extended period, reducing its actual service life. Thus, we avoid maintaining inventory to ensure optimal performance.
2. Why is your nitrogen system more expensive than others?
A nitrogen system comprises core components such as air compressors, refrigerated dryers, filters, nitrogen generators, and buffer tanks. As non-standard equipment, its cost depends on component quality-cheaper auxiliary equipment (e.g., low-grade compressors or dryers) shortens overall system lifespan. For example, a ¥500,000 system and a ¥400,000 system may both operate for 5 years, but the former offers higher reliability and lower long-term costs.
3. How does altitude affect nitrogen production output?
PSA nitrogen generators operate on the principle of constant-pressure adsorption to separate nitrogen and oxygen from air. At higher altitudes, air density decreases, reducing the amount of air available for processing. Consequently, nitrogen production output is directly affected by altitude.
4. Which is more cost-effective: purchasing liquid nitrogen or investing in a nitrogen generator?
Liquid nitrogen prices fluctuate significantly with seasons and regions-typically ¥600-800/ton in off-seasons and up to ¥2,500/ton in peak seasons. In contrast, a PSA nitrogen generator incurs only equipment investment and electricity costs, with expenses calculated based on specific output and purity requirements. For long-term, stable demand, on-site nitrogen generation is generally more economical.
5. What are the acceptance criteria for a nitrogen generator?
The primary acceptance indicators are nitrogen production output and nitrogen purity/concentration, as these directly reflect the system's core performance.
6. How to perform post-purchase maintenance for a nitrogen generator?
Daily maintenance is straightforward, including:
- Regular maintenance of the air compressor (e.g., replacing air filters and oil as per manufacturer instructions).
- Routine checks of the refrigerated dryer: monitoring refrigerant pressure (replenishing if needed), cleaning radiators daily with compressed air, and replacing filters periodically (typically every 8,000 hours, adjusted based on pressure differentials).
- Daily draining of condensate from the air storage tank.
- Inspecting automatic drain valves daily to prevent blockages; if blocked, clean with soapy water after isolating the valve.
- Monitoring the adsorption tower's operating pressure, nitrogen purity, and flow rate regularly.
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