Low Pressure Liquid Nitrogen Plant Industrial Nitrogen Generator

Basic Information
Place of Origin: CHINA
Brand Name: WELLCARE
Certification: ISO, CE,
Model Number: GAS PLANT
Minimum Order Quantity: 1 SETS
Price: ( WhatsApp: +8618067564442 / )
Delivery Time: 60---120 DAYS
Payment Terms: L/C, T/T
Supply Ability: 100 SETS PER YEAR
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Detail Information
Production Capacity: 50-2000 M3/hour Payment Terms: L/C, T/T, Negotiable
Usage: Industrial And Medical Purpose: Gas Manufacturing
Parts: Air Compressor,Expander,Cold Box ,etc. Application Fields: Chemical,Medical,Textile,Metallurgy,etc.
Noise Level: Low Machine Size: Large
Gas Purity: ≥99.6% For Medical / ≥99.99% For Industrial Power: 300-500 KW
Voltage: 380v | 440v 6000V | 10000V

Product Description

For 400TPD or smaller liquid plant, with innovative optimized structure design, cold box can be assembled before delivery and connected at site. Compared with loose delivery, installation time and cost are saved to a large extent, and fractionation column enjoys higher quality and reliability.
Thanks to know-how technology and imported compressor and turbine, the specific power consumption is lower than similar plants, and this advantage is outstanding especially for liquid plants with internal compressed gas products.
Any liquid plant, with hydrogen-free rectified argon system and 100PTD, can produce up to 100 Nm³/h high purity oxygen.
With unchanged flow rate and pressure of air compressor, transforming between LOX and LIN partially within certain ranges is available without influence to the purity and quantity of argon.

Low Pressure Liquid Nitrogen Plant Industrial Nitrogen GeneratorLow Pressure Liquid Nitrogen Plant Industrial Nitrogen GeneratorLow Pressure Liquid Nitrogen Plant Industrial Nitrogen GeneratorLow Pressure Liquid Nitrogen Plant Industrial Nitrogen Generator

Condition: new

Place of origin: China(mainland)

Brand name:  WELLCARE 


Production capacity:50-2000 m3/hour

Power :60-1000 KW


Certification: ISO 9001:2000

Warranty:1 year

Life:20 years with proper maintenance

After-sales service provided: Engineers available to service plants overseas

Usage: Industrial and medical (oxygen, liquid oxygen, nitrogen, liquid nitrogen)

WELLCARE Air separation plants are designed for a vast range of capacities and products summarized below: FOR OXYGEN 99.7 % AND NITROGEN 99.999%





Two compression methods:


1)Internal compression air separation plants:


Air-Compressed-Pre-cooling-Purifier-Rectification-heart exchanger (low pressure liquid)-Liquid oxygen pump(pressurized liquid oxygen)-oxygen vaporizer - oxygen cylinders


2)External compression air separation plants:


Air-Compressed-Precooling-Purifier-Rectification-heart exchanger (low pressure gas)-oxygen storage-oxygen compressor(pressurized oxygen)-oxygen cylinders


The main technical specifications of internal compression


Model contents



















Gox flow Nm³/h 50 80 100 180 300 350 500 800 100
Gox purity %(O2) ≥99.6 ≥99.6 ≥99.6 ≥99.6 ≥99.6 ≥99.6 ≥99.6 ≥99.6 ≥99.6
Gan flow Nm³/h 50 80 100 20 50 80 150 200 300
Gan purity Ppm(O2) ≤10 ≤10 ≤10 ≤10 ≤10 ≤10 ≤10 ≤10 ≤10





1.2 1.2 1.2 1 1 1 1 1 1
Start-up time hour ≤12 ≤12 ≤12 ≤10 ≤10 ≤8 ≤8 ≤8 ≤8



year ≥1 ≥1 ≥1 ≥1 ≥1 ≥1 ≥2 ≥2 ≥2

Oxygen filling (or booster) with liquid pump.


The Plant uses normal temperature molecular sieve adsorption, medium pressure booster expansion reflux flow.

Raw air is sucked from the atmosphere,It is going through filter for removal of dust and mechanical impurities.,then it is compressed to a certain degree by single stage screw compressor,via end stage cooler, air pre-cooling system, the air is cooled to approx. 8℃. After water separation moisture is separated in water separator and then it goes to purifier for removal of moisture, CO2, C2H2 and hydrogen dioxide.

Then most part of air enters main heat exchanger to be cooled to saturated tempt. and partly is liquefied to the lower part of lower column; another part of air is compressed to a certain degree through two stage compression booster, via end stage cooler enters into oxygen heat exchanger to be cooled to be near saturated temperature, then after throttle goes to lower column. Through lower column pre-distillation we can get enriched oxygen liquid air from the bottom of the column. After cooling through sub-cooler,after throttled it goes to the middle part of upper column as reflux liquid for rectification. WN is obtained from the top of lower column, after condensed through condenser-evaporator, a part of WN is used as rectification reflux liquid for lower column; another part after cooling through sub-cooler and after throttling goes to the top of upper column as rectification reflux liquid. Pure liquid oxygen is obtained from the bottom of upper column, and it is condensed by condenser-evaporator. Liquid oxygen is abstracted from the bottom after cooling through sub-cooler, then it goes to LOX pump to be pressurized. It is evaporated in O2 heat exchanger and is reheated to normal tempt and then directly goes to oxygen filling ramp for filling of cylinders.

WN from the top of upper column goes through sub-cooler, the ower part of main heat exchanger to be reheated to a certain tempt. Then it goes to expansion turbine to create cold and returns to sub-cooler and main heat exchanger again to be reheated to normal tempt. A part of it passes to purifier as regenerating gas resource and another part goes to be vented partly.


The main technical specifications of external compression

Model contents

















Gox flow Nm³/h 80 180 350 550 750 1000 1500 3000
Gox purity %(O2) 99.6 99.6 99.6 99.6 99.6 99.6 99.6 99.6
Gan flow Nm³/h 200 500 800 1000 1500 2000 3000 3000
Gan purity Ppm(O2) ≤10 ≤10 ≤10 ≤10 ≤10 ≤10 ≤10 ≤10



Mpa 0.65 0.63 0.62 0.6 0.58 0.58 0.56 0.56
Start-up time hour ≤12 ≤14 ≤16 ≤16 ≤18 ≤18 ≤20 ≤20



year ≥1 ≥1 ≥1 ≥1 ≥1 ≥2 ≥2 ≥2

Oxygen filling(or booster)with oxygen compressor.




High production capacity, high purity, low power consumption, produce Nitrogen, Oxygen .

More choice in designation

As for the big production capacity and high purity, cryogenic air separation plant is now wide used in steel factory, food making, metal welding and cutting etc.

Our cryogenic air separation plants produce oxygen, nitrogen efficiently and safely every day.


How It Works

The process begins with the intake of huge volumes of air from the atmosphere. The air is compressed and purified before entering the cryogenic equipment package. The air is cooled to about -300° F (-185° C) and then, relying on different boiling points, separated into its elemental components in the form of liquid oxygen and nitrogen.

We help to design and manufacture Cryogenic air separation plant of production capacity from 50cbm ~ 2000 cbm.


WELLCARE  cryogenic system components include:

An air filter

An air compressor

An air pre-purifier

An separation tower / insulated package containing cryogenic equipment (cold box)

A turbine expansion engine




we supplied to many countries (Peru, Pakistan, Russia, Kazakhstan, Tajikistan, India, Bangladesh, Thailand, Philippines, North Korea, Mongolia, Equatorial Guinea, Botswana, Zambia, Angola, Tanzania) .


Competitive Advantage:


1.This development and design of flow is new, my company use the technology to mature.

2.Simple operation, convenient maintenance, starting time is short, unit power consumption is low.

3.Oxygen of high purity and very stable, meet and exceed technical indicators of GB8982-1998<<medical oxygen>>

4. Use of air cooling equipment, do not need cooling water, adaptable, saving the cost.

5.Security :The outside compression process is oxygen be compressed at room temperature, The inside compression process is liquid oxygen be compressed at low temperature, Security than more with the inside compression process; Extraction a lot of liquid oxygen from evaporation-condenser, To ensure that no accumulation of hydrocarbons; Evaporation of high pressure with liquid oxygen, reducing the possibility of hydrocarbon accumulation; Reducing fire hazards.

6.Reliability: liquid oxygen pump excellent performance, easy to maintain; Booster compressor is one or two compression, oxygen compressor Booster compressor is three or five compression, High reliability with booster compressor.


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Contact Details
David Liu

WhatsApp : +8618067564442