Cryogenic Air Separation Plant nitrogen.jpg

Cryogenic Air Separation Plant

• Based on cryogenic distillation, utilizing boiling point differences to separate air into high-purity N₂, O₂ and liquid argon
• Single unit N₂ capacity 100~50,000 Nm³/h, N₂ purity ≤3ppm O₂ (99.9997%), O₂ purity ≥99.6%
• High-efficiency turbo expander and main heat exchanger reduce comprehensive energy consumption by 10%~20% vs. conventional units
• Fully automatic PLC/DCS control, load regulation 30%~110%, adapting to downstream fluctuation
• Simultaneous gaseous and liquid product output (LIN, LOX, LAR) with cryogenic liquid storage tanks
• Design life ≥20 years, continuous operation cycle ≥2 years, low maintenance cost
• Modular design, easy installation, small footprint, suitable for on-site centralized gas supply

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Product & Technical Features

Smart Modular Air Separation
- Fully automatic PLC/DCS control, load regulation 30%~110%, adapting to downstream fluctuation
Stable Multi-gas Production
- Simultaneous gaseous and liquid product output (LIN, LOX, LAR) with cryogenic liquid storage tanks
Durable On-site Gas Supply
- Design life ≥20 years, continuous operation cycle ≥2 years, low maintenance cost
Intelligent Cryogenic Separation
- Modular design, easy installation, small footprint, suitable for on-site centralized gas supply

Core Advantages

Low Energy Consumption

Employs an advanced heat exchange network; integrated energy consumption is ≤ 0.48 kWh/Nm³ (for nitrogen), representing an industry-leading standard.
High Reliability

Features oil-free operation of turbomachinery and automatic regeneration of molecular sieves, enabling continuous operation for ≥ 2 years without shutdown.
Flexible Load Adjustment

Supports a load regulation range of 30% to 110%, making it particularly well-suited for variable-load operating conditions found in industries such as coal chemicals and steel manufacturing.
Safety & Environmental Protection

Operates at low temperatures and atmospheric pressure; involves no hazardous chemicals; waste gas can be recovered or discharged in full compliance with environmental standards.
Intelligent Control

Features DCS-based remote diagnostics and fault pre-warning capabilities, requiring minimal operating personnel and facilitating convenient maintenance.

Product Specifications

I. Small Cryogenic Air Separation Unit — Technical Specifications

Model	KDON-50/50	KDON-80/160	KDON-180/300	KDON-260/500	KDON-350/700	KDON-550/1000
O₂ Output Nm³/h	50	80	180	260	350	550
O₂ Purity %O₂	≥99.6	≥99.6	≥99.6	≥99.6	≥99.6	≥99.6
N₂ Output Nm³/h	50	160	300	500	700	1000
N₂ Purity ppm O₂	≤10	≤10	≤10	≤10	≤10	≤10
Unit Energy KWh/Nm³O₂	≤1.3	<0.85	≤0.68	≤0.65	≤0.65	≤0.65
Footprint m²	145	150	160	180	250	420

II. High-Purity Nitrogen (Cryogenic) Unit — Technical Specifications

Model	KDN-200	KDN-300	KDN-400	KDN-700	KDN-1000	KDN-1600
N₂ Output Nm³/h	200	300	400	700	1000	1600
N₂ Purity ppm O₂	≤3	≤3	≤3	≤3	≤3	≤3
LN₂ Output L/h	/	10	10	20	40	60
N₂ Pressure MPa	0.34~1	0.34~1	0.34~1	0.34~1	0.34~1	0.34~1
Footprint m²	95	150	220	260	300	320

III. Liquid Cryogenic / Liquefaction Unit — Technical Specifications

Model	KDO-180y	KDO-250y	KDO-400y	KDON-1200y/300y	KDONAr-1300y/200y/40y
LO₂ Output Nm³/h	180	400	400	1200	1300
LO₂ Purity %	≥99.6	≥99.6	≥99.6	≥99.6	≥99.6
LO₂ Pressure MPa	0.2	0.2	0.2	0.2	0.2
LN₂ Output Nm³/h	—	—	—	300	200
LN₂ Purity PPm O₂	—	—	—	≤5	≤5
LN₂ Pressure MPa	—	—	—	0.5	0.5
LAr Output Nm³/h	—	—	—	—	40
LAr Purity	—	—	—	—	≤1.5ppm O₂+4ppm N₂
LAr Pressure MPa	—	—	—	—	0.2
Footprint m²	250	300	350	850	4000

IV. Physical Properties of Air Components (Table 1) — Composition

Component	Symbol	Volume Fraction %	Weight Fraction %
Nitrogen	N₂	78.084	75.5
Oxygen	O₂	20.95	23.1
Argon	Ar	0.932	1.29
Carbon Dioxide	CO₂	0.035	0.05
Helium	He	0.00046	0.00006
Neon	Ne	0.0016	0.0011
Krypton	Kr	0.00011	0.00032
Xenon	Xe	0.000008	0.00004

V. Physical Properties of Air Components (Table 2) — Physical Data

Component	Symbol	Boiling Pt. ℃	Melting Pt. ℃	Gas Density Kg/m³	Liquid Density Kg/L	Critical Temp. ℃	Critical Pressure MPa(G)
Nitrogen	N₂	-195.8	-209.86	1.2506	0.81	-147	3.45
Oxygen	O₂	-183	-218.4	1.4289	1.14	-119	5.13
Argon	Ar	-185.7	-189.2	1.784	1.4	-122	4.959
Helium	He	-268.9	-272.55	0.18	0.125	-267.7	0.2335
Neon	Ne	-246.1	-248.6	0.748	1.204	-228.7	2.813
Krypton	Kr	-153.2	-157.2	1.735	2.155	-63.7	5.6
Xenon	Xe	-108	-111.8	1.664	3.52	16.6	6.01

Working Principle

① Pre-cooling and Compression: Feed air compressed to 0.5~0.8MPa, pre-cooled to ~5℃ for dewatering.
② Molecular Sieve Purification: Enters molecular sieve adsorber; 13X sieve adsorbs residual H₂O, CO₂, hydrocarbons.
③ Main Heat Exchange + Expansion Refrigeration: Purified air cooled to ~-170℃ in main heat exchanger; turbo expander provides refrigeration.
④ Distillation Separation: Enters distillation column; preliminary separation in lower column, rectification in upper column yields high-purity N₂ and O₂.
⑤ Product Export: Gaseous products reheated and delivered; part liquefied and stored in cryogenic tanks (LIN -196℃, LOX -183℃).

Distillation equation: α = (y_N₂/x_N₂)/(y_O₂/x_O₂), relative volatility of nitrogen and oxygen α≈3.5 (at atmospheric pressure).

Key Application Scenarios

Steel & Metallurgy: O₂ for coal injection & steelmaking; N₂ for tuyere sealing & instrument purging

Coal Chemical

Large-scale N₂ for coal gasification, ammonia synthesis, methanol production
Electronics & Semiconductor

Ultra-high purity N₂ (≥99.9999%) for chip manufacturing
Medical

Medical LOX for hospital O₂ supply; LIN for cryopreservation
Food & Beverage

LIN freezing, N₂ flushing for freshness
Metal Heat Treatment

High-purity N₂ for annealing & quenching to prevent oxidation
Aerospace

LOX as rocket oxidizer